Some standard content:
Engineering Construction Standard Full Text Information System
Construction Industry Standard of the People's Republic of China JG/T
3032—1995
Steelformwork for prefabricated concrete productsConstruction standards
1996-03-05Released
Ministry of Construction of the People's Republic of China
1996-05-01Implemented
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Subject content and scope of application
Cited standards
Technical requirements for steel formwork classification, model compilation and structure selection...
Test methods·
Inspection rules·
Marking, transportation and storage
Appendix A
Appendix politics
Appendix D
Appendix function
Appendix E
Appendix F
Common Prestressed concrete component code (supplement) Common non-prestressed concrete component code (supplement) times
Determination of bending deformation of steel formwork under design value of vertical load (reference)Determination of bending deformation of steel formwork under prestressing tension force (reference)Determination of warping deformation of steel formwork under design value of straightening load (reference)Determination of lateral bending deformation of steel side formwork under design value of horizontal load (reference)0oe00i
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Engineering Construction Standard Full-text Information System
Subject Content and Scope of Application
Construction Industry Standard of the People's Republic of China Steel formwork for prefabricated concrete components
Steel formwork for prefabricated concrete productsJG/T3032—1995
This standard specifies the classification, structural selection, technical requirements, inspection rules, marking, transportation and storage of prefabricated concrete main component steel formwork (hereinafter referred to as steel formwork) products.
This standard is mainly applicable to the manufacture and acceptance of steel formwork for precast concrete and prestressed concrete components in industrial and civil construction projects. Similar steel formwork in other civil engineering projects can also be implemented with reference to the relevant provisions of this standard. 2 Reference standards
Technical conditions for ordinary carbon structural steel
Technical conditions for high-quality carbon structural steel
Design code for steel structures
Technical code for cold-formed thin-walled steel structures
Method for representing weld symbols
Standard for quality inspection and assessment of weld slopes for gas welding, manual arc welding and gas shielded welding precast concrete components GB2975
Sampling regulations for mechanical and process performance tests of steel materials GBJ205
Code for construction and acceptance of steel structure projects
3 Terminology
3.1 Soffit formwork
Steel formwork component on the bottom surface of a forming component
Side formwork
Steel formwork component on the long side of a forming component.
End formwork
Steel formwork component on the short side of a forming component.
3.4 The soffit formwork with wheel The steel formwork with wheels.
3.5 Heating wupplied formwork The steel formwork with heat medium cavity or heat source cavity. 3.6 Working surface (working surface, forming surface) Working surface
The surface of the steel formwork in contact with concrete.
3.7 Buckle
Type martial arts
The deformation of a certain angle of the steel formwork relative to the plane formed by the other three angles. This deformation value represents the buckling value. Approved by the Ministry of Construction of the People's Republic of China on March 5, 1996 and implemented on May 1, 1996
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4 Classification, model compilation and structural selection of steel formwork 4.1 Classification of steel formwork
Steel formwork is divided into the following six categories according to its components:
a. Steel formwork for plate-type components.
b. Steel formwork for wall panel components.
c Steel formwork for beam components
d. Steel formwork for column components.
e. Steel formwork for pile components.
f. Steel formwork for trusses and thin-webbed beam components. 4.2 Compilation of steel formwork models
Marking example
Form modification serial number
Form length, expressed as L/100
Form width, expressed as B/10
Component code [see Appendix A (Supplement) and Appendix B (Supplement)) Formwork code
Prestressed lower roof panel steel formwork, finalized design in 1993, model: MYWB150601500mm×6000mm
1200m m×3900mm prestressed circular hole plate steel formwork, finalized design in 1994, model: MYKB4.3 Steel formwork structure selection
4.3.1 General structural type of steel formwork bottom formwork (see Figure 1) 3X888
12039—94JG/T
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Figure 1 General structural type of bottom formwork
4.3.1.1 Figure 1 (a) is applicable to B not greater than 0. 8m, the bottom formwork for bearing unidirectional prestressing load and vertical load, 4.3.1.2 Figure 1 (b) and Figure 1 (c) are applicable to the bottom formwork for B not more than 2m, bearing unidirectional prestressing load and vertical load; 4.3.1.3 Figure 1 (d) is applicable to the bottom formwork for B not more than 3m, bearing vertical load; Figure 1 (e) is applicable to the bottom formwork for B not more than 3m, bearing unidirectional prestressing load and vertical load,
4.3.1.4 Figure 1 (f) is applicable to the bottom formwork for B more than 3m, bearing bidirectional prestressing 4.3.1.5 Figure 1 (g) is applicable to the isosceles three-point supported bottom formwork (form car) with B greater than 3m and bearing bidirectional prestressed load and vertical load; bzsosO, C Engineering Construction Standard Full Text Information System
4.3.1.6 Figure 1 (h) is applicable to the isosceles three-point supported bottom formwork (form car) with B greater than 3m and bearing only vertical load; 4.3.1.7 Figure 1 (i) is applicable to use in non-mobile production processes and closed hot mold skeleton structures. 4.3.2 Typical structural construction of steel formwork bottom formwork 4.3.2.1 Diamond lattice (see Figure 2)
The inner skeleton beam structure adopts a diagonal cross structure called diamond lattice, which is applicable to the bottom formwork bearing vertical load. The angle α between the diagonal rib and the frame should be controlled between 35 and 55, and 45 is the best. According to calculation, the diagonal rib should preferably be cold-formed channel steel or cold-formed I-shaped steel, and ordinary hot-rolled channel steel or flat steel can also be used. JJLJL
Figure 2 Diamond structure
1 Frame: 2-Diagonal rib: 3-Panel
4.3.242 Combined lattice (see Figure 3)
The combined lattice is suitable for the bottom mold that bears the combined action of unidirectional prestressed load and vertical load. It is composed of a diamond lattice with high torsional rigidity and a rectangular structure of a box-section beam with good bending and torsion resistance. Figure 3 Combined structure
4.3.2.3 Isosceles three-point supported bottom mold
Figure 4 (a) is suitable for the bottom mold or mold car that bears the combined action of bidirectional prestressed load and vertical load, and Figure 4 (b) is suitable for the bottom mold or mold car with vertical load.
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Figure 4 Isosceles three-point support bottom mold lattice
The mold car adopts a three-point support type (see Figure 5) Figure 5 (a) is suitable for the unit flow production process: Figure 5 (b) is suitable for rail-adapted conveyor flow production.bzsoso.Com Engineering Construction Standard Full Text Information System
?100120mm
4.3.3 Side mold section type
Figure 5 Isosceles three-point support mold car
The side mold section should be based on the shape and size of the concrete component, and adopt a box-type section Surface (see Figure 6), under the condition that can meet the stiffness requirements (Figure 8)
two working conditions and stiffness requirements are determined, the section should preferably adopt a groove section (see Figure 7) or a combined section (see Figure 6 Box section side form
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Figure 7 Groove section side form
Figure 8 Combined section side form
Figure 9 Connection type between bottom form and side form
1-elastic member 2-bottom plate, 3-thrust mechanism.bzsoso.Com Engineering Construction Standard Full Text Information System
4.3.4 Section type of end formwork
The section type of end formwork shall be determined according to the opening and closing and size of concrete components, production method, working conditions and rigidity requirements. The section type may be box type or other section types.
4.3.5 The connection type of side formwork and bottom formwork
shall be determined according to the shape and size of concrete components, production method and working conditions. It may be fixed type [see Figure 9 (a), movable type [see Figure 9 (b)] and elastic connection type [see Figure 9 (c)]. Technical requirements
General requirements for steel formwork
5.1.1 Steel formwork shall comply with the requirements of this standard and be manufactured in accordance with the drawings and technical documents approved by the prescribed procedures. 5.1.2 Steel formwork must have sufficient bearing capacity, rigidity and stability. 5.1.34
Steel formwork shall ensure smooth demoulding of concrete components without damaging the components. 5.1.44
The detachable parts of steel formwork shall ensure easy disassembly, reliable connection and correct positioning. 5.1.5
Steel formwork with hinged side formwork should be able to open and close flexibly, and should be equipped with an opening angle limiter. The side formwork component limiter should be reliable, the positioning should be consistent, and there should be no less than two. The positioning lock and pin tightening mechanism should be easy to use, reliable in performance, sturdy and durable, and should not loosen on its own during vibration forming.
The lifting device of the steel formwork should be safe, reliable and easy to use. The parts of the steel formwork that bear the tension of the prestressed steel bars should be safe and reliable. Protective devices should be installed at the anchoring end and the tensioning end. 5.1.8 For steel formworks that need to be stacked during use, support pads or anti-slip devices should be installed according to the production process requirements. 5.1.9
Condensation.
The steel formwork with steam cavity or steam pipe shall meet the requirements of concrete component maintenance process in structure and be able to discharge cold and hot electricity smoothly. The steel formwork shall be equipped with leakage protection device. The electric heating device in the mold cavity and the steel frame shall be insulated. The grounding wire shall use soft rubber wire to ensure safe use. 5.1.1 The structure of the steel formwork shall be convenient for the replacement of vulnerable parts. 5.2 Material requirements for steel formwork
5.2.1 The main material for manufacturing steel formwork shall have material certificate. If there is no material certificate, material property test shall be carried out. 5.2.2 The strength of the structural material in the steel formwork shall meet the design requirements and have good weldability. It is advisable to use low carbon steel and meet the requirements of GB700.
5.β.3 The removable fixings and vulnerable parts on the steel formwork that bear tension shall be made of medium carbon steel and heat treated, and shall meet the requirements of GB69.
5.2.4 The lifting device of the steel formwork shall be made of low-carbon steel and shall comply with the requirements of GB700. 5. Design requirements for β steel formwork
5.3.1 The steel formwork shall first be designed according to the stiffness. Under the load design value, its deformation shall comply with the requirements of Table 1 of the design allowable deformation value specified in this standard; secondly, the verification of the bearing capacity of the steel formwork and the verification of the stability of the pressure-bearing parts shall be carried out in accordance with the provisions of GBJ17 and GBJ18. Table 1 Design allowable deformation values
Bottom form panel area deflection
Bottom form warping deformation
Bottom form bending deformation
Side form bending deformation
b1/2000, and not more than 0.5
L/1500, and not more than 5
L/1500, and horizontal plate and pile formwork are not more than 3 beam and column formwork are not more than 4 values
L/2000, and horizontal plate and wall panel formwork are not more than 2.5; beam, column, pile, truss, thin-web beam formwork is not more than 3.5mm
Note: 61 in the table is the minimum span in the bottom formwork frame area, the short span in the rectangular lattice, and the minimum span through the centroid and parallel to the frame edge in the diamond lattice.
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5.3.2 The load design value is the standard load multiplied by the load partial coefficient. For stiffness design, when bearing non-prestressed loads, the partial coefficient of the self-weight load of steel bars, concrete, and formwork is 1.1, but the dynamic coefficient is not considered; when bearing prestressed loads, the partial coefficient of the prestressed tension load is 1.05; for bearing capacity verification and stability verification, when non-prestressed loads are used, the partial coefficient of the self-weight load of steel bars, concrete, and formwork is 1.2, and a dynamic coefficient of 1.4 should be considered; when bearing prestressed loads, the partial coefficient of the prestressed tension load is 1.05. For the side form lateral bending stiffness design, the horizontal load partial coefficient is 1.1, and a dynamic coefficient of 1.4 must be considered. 5.3.3 The design allowable deformation values of the grid deflection of the bottom form panel, the bottom form warping deformation, the bottom form bending deformation, and the side form bending deformation shall comply with the provisions of the table.
Manufacturing requirements for steel formwork
5.4.1 The working surface of the bottom formwork of the steel formwork should be made of integral materials. If splicing is required: when the width is less than 2m, there should be no more than one weld; when it is not less than 2m, there should be no more than two welds; when the length is less than 4.2m, there should be no more than one weld; when it is not less than 4.2m, there should be no more than two welds.
5.4.2 The main ribs of the steel formwork should be made of integral materials. If splicing is required, there should be no more than one splicing weld, and the splicing position should be at a place with less stress. The splicing welds between the main ribs should be staggered and not less than 200mm.
5.4.3 There should be no defects such as cracks, scars, and delamination on the forming working surface of the steel formwork. If there are some abrasions, rust, scratches, indentations and burns, their depth should not be greater than 0.5mm and their width should not be greater than 2mm. 5.4.4
The welds of steel formwork shall be processed in accordance with the requirements of the design drawings approved by the prescribed procedures, and the welds shall comply with the following provisions: the nodes of the steel formwork frame must be fully welded, the joints of the bottom formwork panel and the side formwork panel must be fully welded, and when the plate exceeds 8mm, groove welding must be used; the length of the welds of the assembled frame and the contact between the frame and the panel shall not be less than 40% of the total seam length. 5.4.5 The welds on the steel formwork shall comply with the welding standards GB324 and GB985. The welds on the working surface of the steel formwork shall be ground flat, and the height difference between the interface planes and between the welds and the plate surface after grinding shall not exceed 0.5mm. 5.4.6 During the manufacture of the steel formwork, effective measures shall be taken to reduce welding deformation. 5.4.7
After the steel formwork is assembled, the local maximum gap between the side formwork, end formwork and bottom formwork working surface shall not be greater than 1mm, and the cumulative length of the gap of 0.81mm shall not be greater than 25% of the joint length on each side. 5.4.8 After the steel formwork is assembled, the deformation value of its working surface under the action of tension force and load design value shall meet the design requirements of Table 1. The allowable deviation of the inner cavity size of the steel formwork for plate components shall meet the requirements of Table 2. 5.4.9
5.4.10 The allowable deviation of the inner cavity size of the steel formwork for wall panel components shall meet the requirements of Table 3. 5.4.11
The allowable deviation of the inner cavity size of the steel formwork for beam components shall meet the requirements of Table 4. 5.4.12 The allowable deviation of the inner cavity size of the steel formwork for column components shall meet the requirements of Table 5.5.4.13 The allowable deviation of the inner cavity size of the steel formwork for pile components shall meet the requirements of Table 6. 5.4.14 The allowable deviation of the inner cavity size of the steel formwork for trusses and thin-web beam components shall meet the requirements of Table 7. 5.4.15V The allowable deviation of the size between the lower edge of the notch of the prestressed steel bar anchor and the bottom form work surface shall not exceed 0~-1mm.
5.4.16 The allowable deviation of the verticality of the supporting surface of the prestressed steel bar anchor and the working surface of the bottom form shall not exceed 1/50 of the height dimension of the part in the supporting part of the prestressed steel bar anchor, and shall be inclined outward. 5.4.17 The working surface and rotating parts of the steel formwork shall be painted with anti-rust oil, and other surfaces shall be painted with anti-corrosion and anti-rust paint. Table 2 Allowable deviation of the inner cavity dimensions of steel formwork for plate components Item
Allowable deviation
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Diagonal difference
Lateral bending
Surface flatness
Height difference of panel surfacebZxz.net
Assembly gap
Continued Table 2
L≤4200
L>4 200
End, side form and bottom form
End form and side form
Assembly end form and side form height difference
Inserted reinforcement, embedded parts
Center line displacement
Installation hole
Reserved hole
Tension plate, anchor, end form notch center line H≤200
Verticality of side form and bottom form
20044
The removable parts of the steel formwork should ensure easy disassembly, reliable connection and correct positioning. 5.1.5
The steel formwork equipped with hinged side formwork should be able to open and close flexibly, and an opening angle limiter should be set. The limit device of the side formwork components should be reliable, the positioning should be consistent, and there should be no less than two. The positioning lock and the pin tightening mechanism should be easy to use, reliable in performance, sturdy and durable, and should not loosen automatically during vibration forming.
The lifting device of the steel formwork should be safe, reliable and easy to use. The parts of the steel formwork that bear the tension of the prestressed steel bars should be safe and reliable. Protective devices should be installed at the anchoring end and the tensioning end. 5.1.8 For steel formworks that need to be stacked during use, support pads or anti-slip devices should be set according to the production process requirements. 5.1.9
Condensation.
The steel formwork with steam cavity or steam pipe shall meet the requirements of concrete component maintenance process in structure and be able to discharge cold and hot electricity smoothly. The steel formwork shall be equipped with leakage protection device. The electric heating device in the mold cavity and the steel frame shall be insulated. The grounding wire shall use soft rubber wire to ensure safe use. 5.1.1 The structure of the steel formwork shall be convenient for the replacement of vulnerable parts. 5.2 Material requirements for steel formwork
5.2.1 The main material for manufacturing steel formwork shall have material certificate. If there is no material certificate, material property test shall be carried out. 5.2.2 The strength of the structural material in the steel formwork shall meet the design requirements and have good weldability. It is advisable to use low carbon steel and meet the requirements of GB700.
5.β.3 The removable fixings and vulnerable parts on the steel formwork that bear tension shall be made of medium carbon steel and heat treated, and shall meet the requirements of GB69.
5.2.4 The lifting device of the steel formwork shall be made of low-carbon steel and shall comply with the requirements of GB700. 5. Design requirements for β steel formwork
5.3.1 The steel formwork shall first be designed according to the stiffness. Under the load design value, its deformation shall comply with the requirements of Table 1 of the design allowable deformation value specified in this standard; secondly, the verification of the bearing capacity of the steel formwork and the verification of the stability of the pressure-bearing parts shall be carried out in accordance with the provisions of GBJ17 and GBJ18. Table 1 Design allowable deformation values
Bottom form panel area deflection
Bottom form warping deformation
Bottom form bending deformation
Side form bending deformation
b1/2000, and not more than 0.5
L/1500, and not more than 5
L/1500, and horizontal plate and pile formwork are not more than 3 beam and column formwork are not more than 4 values
L/2000, and horizontal plate and wall panel formwork are not more than 2.5; beam, column, pile, truss, thin-web beam formwork is not more than 3.5mm
Note: 61 in the table is the minimum span in the bottom formwork frame area, the short span in the rectangular lattice, and the minimum span through the centroid and parallel to the frame edge in the diamond lattice.
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5.3.2 The load design value is the standard load multiplied by the load partial coefficient. For stiffness design, when bearing non-prestressed loads, the partial coefficient of the self-weight load of steel bars, concrete, and formwork is 1.1, but the dynamic coefficient is not considered; when bearing prestressed loads, the partial coefficient of the prestressed tension load is 1.05; for bearing capacity verification and stability verification, when non-prestressed loads are used, the partial coefficient of the self-weight load of steel bars, concrete, and formwork is 1.2, and a dynamic coefficient of 1.4 should be considered; when bearing prestressed loads, the partial coefficient of the prestressed tension load is 1.05. For the side form lateral bending stiffness design, the horizontal load partial coefficient is 1.1, and a dynamic coefficient of 1.4 must be considered. 5.3.3 The design allowable deformation values of the grid deflection of the bottom form panel, the bottom form warping deformation, the bottom form bending deformation, and the side form bending deformation shall comply with the provisions of the table.
Manufacturing requirements for steel formwork
5.4.1 The working surface of the bottom formwork of the steel formwork should be made of integral materials. If splicing is required: when the width is less than 2m, there should be no more than one weld; when it is not less than 2m, there should be no more than two welds; when the length is less than 4.2m, there should be no more than one weld; when it is not less than 4.2m, there should be no more than two welds.
5.4.2 The main ribs of the steel formwork should be made of integral materials. If splicing is required, there should be no more than one splicing weld, and the splicing position should be at a place with less stress. The splicing welds between the main ribs should be staggered and not less than 200mm.
5.4.3 There should be no defects such as cracks, scars, and delamination on the forming working surface of the steel formwork. If there are some abrasions, rust, scratches, indentations and burns, their depth should not be greater than 0.5mm and their width should not be greater than 2mm. 5.4.4
The welds of steel formwork shall be processed in accordance with the requirements of the design drawings approved by the prescribed procedures, and the welds shall comply with the following provisions: the nodes of the steel formwork frame must be fully welded, the joints of the bottom formwork panel and the side formwork panel must be fully welded, and when the plate exceeds 8mm, groove welding must be used; the length of the welds of the assembled frame and the contact between the frame and the panel shall not be less than 40% of the total seam length. 5.4.5 The welds on the steel formwork shall comply with the welding standards GB324 and GB985. The welds on the working surface of the steel formwork shall be ground flat, and the height difference between the interface planes and between the welds and the plate surface after grinding shall not exceed 0.5mm. 5.4.6 During the manufacture of the steel formwork, effective measures shall be taken to reduce welding deformation. 5.4.7
After the steel formwork is assembled, the local maximum gap between the side formwork, end formwork and bottom formwork working surface shall not be greater than 1mm, and the cumulative length of the gap of 0.81mm shall not be greater than 25% of the joint length on each side. 5.4.8 After the steel formwork is assembled, the deformation value of its working surface under the action of tension force and load design value shall meet the design requirements of Table 1. The allowable deviation of the inner cavity size of the steel formwork for plate components shall meet the requirements of Table 2. 5.4.9
5.4.10 The allowable deviation of the inner cavity size of the steel formwork for wall panel components shall meet the requirements of Table 3. 5.4.11
The allowable deviation of the inner cavity size of the steel formwork for beam components shall meet the requirements of Table 4. 5.4.12 The allowable deviation of the inner cavity size of the steel formwork for column components shall meet the requirements of Table 5.5.4.13 The allowable deviation of the inner cavity size of the steel formwork for pile components shall meet the requirements of Table 6. 5.4.14 The allowable deviation of the inner cavity size of the steel formwork for trusses and thin-web beam components shall meet the requirements of Table 7. 5.4.15V The allowable deviation of the size between the lower edge of the notch of the prestressed steel bar anchor and the bottom form work surface shall not exceed 0~-1mm.
5.4.16 The allowable deviation of the verticality of the supporting surface of the prestressed steel bar anchor and the working surface of the bottom form shall not exceed 1/50 of the height dimension of the part in the supporting part of the prestressed steel bar anchor, and shall be inclined outward. 5.4.17 The working surface and rotating parts of the steel formwork shall be painted with anti-rust oil, and other surfaces shall be painted with anti-corrosion and anti-rust paint. Table 2 Allowable deviation of the inner cavity dimensions of steel formwork for plate components Item
Allowable deviation
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Diagonal difference
Lateral bending
Surface flatness
Height difference of panel surface
Assembly gap
Continued Table 2
L≤4200
L>4 200
End, side form and bottom form
End form and side form
Assembly end form and side form height difference
Inserted reinforcement, embedded parts
Center line displacement
Installation hole
Reserved hole
Tension plate, anchor, end form notch center line H≤200
Verticality of side form and bottom form
20044
The removable parts of the steel formwork should ensure easy disassembly, reliable connection and correct positioning. 5.1.5
The steel formwork equipped with hinged side formwork should be able to open and close flexibly, and an opening angle limiter should be set. The limit device of the side formwork components should be reliable, the positioning should be consistent, and there should be no less than two. The positioning lock and the pin tightening mechanism should be easy to use, reliable in performance, sturdy and durable, and should not loosen automatically during vibration forming.
The lifting device of the steel formwork should be safe, reliable and easy to use. The parts of the steel formwork that bear the tension of the prestressed steel bars should be safe and reliable. Protective devices should be installed at the anchoring end and the tensioning end. 5.1.8 For steel formworks that need to be stacked during use, support pads or anti-slip devices should be set according to the production process requirements. 5.1.9
Condensation.
The steel formwork with steam cavity or steam pipe shall meet the requirements of concrete component maintenance process in structure and be able to discharge cold and hot electricity smoothly. The steel formwork shall be equipped with leakage protection device. The electric heating device in the mold cavity and the steel frame shall be insulated. The grounding wire shall use soft rubber wire to ensure safe use. 5.1.1 The structure of the steel formwork shall be convenient for the replacement of vulnerable parts. 5.2 Material requirements for steel formwork
5.2.1 The main material for manufacturing steel formwork shall have material certificate. If there is no material certificate, material property test shall be carried out. 5.2.2 The strength of the structural material in the steel formwork shall meet the design requirements and have good weldability. It is advisable to use low carbon steel and meet the requirements of GB700.
5.β.3 The removable fixings and vulnerable parts on the steel formwork that bear tension shall be made of medium carbon steel and heat treated, and shall meet the requirements of GB69.
5.2.4 The lifting device of the steel formwork shall be made of low-carbon steel and shall comply with the requirements of GB700. 5. Design requirements for β steel formwork
5.3.1 The steel formwork shall first be designed according to the stiffness. Under the load design value, its deformation shall comply with the requirements of Table 1 of the design allowable deformation value specified in this standard; secondly, the verification of the bearing capacity of the steel formwork and the verification of the stability of the pressure-bearing parts shall be carried out in accordance with the provisions of GBJ17 and GBJ18. Table 1 Design allowable deformation values
Bottom form panel area deflection
Bottom form warping deformation
Bottom form bending deformation
Side form bending deformation
b1/2000, and not more than 0.5
L/1500, and not more than 5
L/1500, and horizontal plate and pile formwork are not more than 3 beam and column formwork are not more than 4 values
L/2000, and horizontal plate and wall panel formwork are not more than 2.5; beam, column, pile, truss, thin-web beam formwork is not more than 3.5mm
Note: 61 in the table is the minimum span in the bottom formwork frame area, the short span in the rectangular lattice, and the minimum span through the centroid and parallel to the frame edge in the diamond lattice.
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5.3.2 The load design value is the standard load multiplied by the load partial coefficient. For stiffness design, when bearing non-prestressed loads, the partial coefficient of the self-weight load of steel bars, concrete, and formwork is 1.1, but the dynamic coefficient is not considered; when bearing prestressed loads, the partial coefficient of the prestressed tension load is 1.05; for bearing capacity verification and stability verification, when non-prestressed loads are used, the partial coefficient of the self-weight load of steel bars, concrete, and formwork is 1.2, and a dynamic coefficient of 1.4 should be considered; when bearing prestressed loads, the partial coefficient of the prestressed tension load is 1.05. For the side form lateral bending stiffness design, the horizontal load partial coefficient is 1.1, and a dynamic coefficient of 1.4 must be considered. 5.3.3 The design allowable deformation values of the grid deflection of the bottom form panel, the bottom form warping deformation, the bottom form bending deformation, and the side form bending deformation shall comply with the provisions of the table.
Manufacturing requirements for steel formwork
5.4.1 The working surface of the bottom formwork of the steel formwork should be made of integral materials. If splicing is required: when the width is less than 2m, there should be no more than one weld; when it is not less than 2m, there should be no more than two welds; when the length is less than 4.2m, there should be no more than one weld; when it is not less than 4.2m, there should be no more than two welds.
5.4.2 The main ribs of the steel formwork should be made of integral materials. If splicing is required, there should be no more than one splicing weld, and the splicing position should be at a place with less stress. The splicing welds between the main ribs should be staggered and not less than 200mm.
5.4.3 There should be no defects such as cracks, scars, and delamination on the forming working surface of the steel formwork. If there are some abrasions, rust, scratches, indentations and burns, their depth should not be greater than 0.5mm and their width should not be greater than 2mm. 5.4.4
The welds of steel formwork shall be processed in accordance with the requirements of the design drawings approved by the prescribed procedures, and the welds shall comply with the following provisions: the nodes of the steel formwork frame must be fully welded, the joints of the bottom formwork panel and the side formwork panel must be fully welded, and when the plate exceeds 8mm, groove welding must be used; the length of the welds of the assembled frame and the contact between the frame and the panel shall not be less than 40% of the total seam length. 5.4.5 The welds on the steel formwork shall comply with the welding standards GB324 and GB985. The welds on the working surface of the steel formwork shall be ground flat, and the height difference between the interface planes and between the welds and the plate surface after grinding shall not exceed 0.5mm. 5.4.6 During the manufacture of the steel formwork, effective measures shall be taken to reduce welding deformation. 5.4.7
After the steel formwork is assembled, the local maximum gap between the side formwork, end formwork and bottom formwork working surface shall not be greater than 1mm, and the cumulative length of the gap of 0.81mm shall not be greater than 25% of the joint length on each side. 5.4.8 After the steel formwork is assembled, the deformation value of its working surface under the action of tension force and load design value shall meet the design requirements of Table 1. The allowable deviation of the inner cavity size of the steel formwork for plate components shall meet the requirements of Table 2. 5.4.9
5.4.10 The allowable deviation of the inner cavity size of the steel formwork for wall panel components shall meet the requirements of Table 3. 5.4.11
The allowable deviation of the inner cavity size of the steel formwork for beam components shall meet the requirements of Table 4. 5.4.12 The allowable deviation of the inner cavity size of the steel formwork for column components shall meet the requirements of Table 5.5.4.13 The allowable deviation of the inner cavity size of the steel formwork for pile components shall meet the requirements of Table 6. 5.4.14 The allowable deviation of the inner cavity size of the steel formwork for trusses and thin-web beam components shall meet the requirements of Table 7. 5.4.15V The allowable deviation of the size between the lower edge of the notch of the prestressed steel bar anchor and the bottom form work surface shall not exceed 0~-1mm.
5.4.16 The allowable deviation of the verticality of the supporting surface of the prestressed steel bar anchor and the working surface of the bottom form shall not exceed 1/50 of the height dimension of the part in the supporting part of the prestressed steel bar anchor, and shall be inclined outward. 5.4.17 The working surface and rotating parts of the steel formwork shall be painted with anti-rust oil, and other surfaces shall be painted with anti-corrosion and anti-rust paint. Table 2 Allowable deviation of the inner cavity dimensions of steel formwork for plate components Item
Allowable deviation
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Diagonal difference
Lateral bending
Surface flatness
Height difference of panel surface
Assembly gap
Continued Table 2
L≤4200
L>4 200
End, side form and bottom form
End form and side form
Assembly end form and side form height difference
Inserted reinforcement, embedded parts
Center line displacement
Installation hole
Reserved hole
Tension plate, anchor, end form notch center line H≤200
Verticality of side form and bottom form
2003. The removable fixings and wearing parts on the steel formwork that bear the tension force shall be made of medium carbon steel and heat treated, and shall comply with the requirements of GB69.
5.2.4 The lifting device of the steel formwork shall be made of low carbon steel and shall comply with the requirements of GB700. 5. Design requirements for β steel formwork
5.3.1 The steel formwork shall first be designed according to the stiffness. Under the action of the load design value, its deformation shall comply with the requirements of Table 1 of the design allowable deformation value specified in this standard; secondly, the verification of the bearing capacity of the steel formwork and the verification of the stability of the pressure-bearing parts shall be carried out in accordance with the provisions of GBJ17 and GBJ18. Table 1 Design allowable deformation values
Bottom form panel area deflection
Bottom form warping deformation
Bottom form bending deformation
Side form bending deformation
b1/2000, and not more than 0.5
L/1500, and not more than 5
L/1500, and horizontal plate and pile formwork are not more than 3 beam and column formwork are not more than 4 values
L/2000, and horizontal plate and wall panel formwork are not more than 2.5; beam, column, pile, truss, thin-web beam formwork is not more than 3.5mm
Note: 61 in the table is the minimum span in the bottom formwork frame area, the short span in the rectangular lattice, and the minimum span through the centroid and parallel to the frame edge in the diamond lattice.
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5.3.2 The load design value is the standard load multiplied by the load partial coefficient. For stiffness design, when bearing non-prestressed loads, the partial coefficient of the self-weight load of steel bars, concrete, and formwork is 1.1, but the dynamic coefficient is not considered; when bearing prestressed loads, the partial coefficient of the prestressed tension load is 1.05; for bearing capacity verification and stability verification, when non-prestressed loads are used, the partial coefficient of the self-weight load of steel bars, concrete, and formwork is 1.2, and a dynamic coefficient of 1.4 should be considered; when bearing prestressed loads, the partial coefficient of the prestressed tension load is 1.05. For the side form lateral bending stiffness design, the horizontal load partial coefficient is 1.1, and a dynamic coefficient of 1.4 must be considered. 5.3.3 The design allowable deformation values of the grid deflection of the bottom form panel, the bottom form warping deformation, the bottom form bending deformation, and the side form bending deformation shall comply with the provisions of the table.
Manufacturing requirements for steel formwork
5.4.1 The working surface of the bottom formwork of the steel formwork should be made of integral materials. If splicing is required: when the width is less than 2m, there should be no more than one weld; when it is not less than 2m, there should be no more than two welds; when the length is less than 4.2m, there should be no more than one weld; when it is not less than 4.2m, there should be no more than two welds.
5.4.2 The main ribs of the steel formwork should be made of integral materials. If splicing is required, there should be no more than one splicing weld, and the splicing position should be at a place with less stress. The splicing welds between the main ribs should be staggered and not less than 200mm.
5.4.3 There should be no defects such as cracks, scars, and delamination on the forming working surface of the steel formwork. If there are some abrasions, rust, scratches, indentations and burns, their depth should not be greater than 0.5mm and their width should not be greater than 2mm. 5.4.4
The welds of steel formwork shall be processed in accordance with the requirements of the design drawings approved by the prescribed procedures, and the welds shall comply with the following provisions: the nodes of the steel formwork frame must be fully welded, the joints of the bottom formwork panel and the side formwork panel must be fully welded, and when the plate exceeds 8mm, groove welding must be used; the length of the welds of the assembled frame and the contact between the frame and the panel shall not be less than 40% of the total seam length. 5.4.5 The welds on the steel formwork shall comply with the welding standards GB324 and GB985. The welds on the working surface of the steel formwork shall be ground flat, and the height difference between the interface planes and between the welds and the plate surface after grinding shall not exceed 0.5mm. 5.4.6 During the manufacture of the steel formwork, effective measures shall be taken to reduce welding deformation. 5.4.7
After the steel formwork is assembled, the local maximum gap between the side formwork, end formwork and bottom formwork working surface shall not be greater than 1mm, and the cumulative length of the gap of 0.81mm shall not be greater than 25% of the joint length on each side. 5.4.8 After the steel formwork is assembled, the deformation value of its working surface under the action of tension force and load design value shall meet the design requirements of Table 1. The allowable deviation of the inner cavity size of the steel formwork for plate components shall meet the requirements of Table 2. 5.4.9
5.4.10 The allowable deviation of the inner cavity size of the steel formwork for wall panel components shall meet the requirements of Table 3. 5.4.11
The allowable deviation of the inner cavity size of the steel formwork for beam components shall meet the requirements of Table 4. 5.4.12 The allowable deviation of the inner cavity size of the steel formwork for column components shall meet the requirements of Table 5.5.4.13 The allowable deviation of the inner cavity size of the steel formwork for pile components shall meet the requirements of Table 6. 5.4.14 The allowable deviation of the inner cavity size of the steel formwork for trusses and thin-web beam components shall meet the requirements of Table 7. 5.4.15V The allowable deviation of the size between the lower edge of the notch of the prestressed steel bar anchor and the bottom form work surface shall not exceed 0~-1mm.
5.4.16 The allowable deviation of the verticality of the supporting surface of the prestressed steel bar anchor and the working surface of the bottom form shall not exceed 1/50 of the height dimension of the part in the supporting part of the prestressed steel bar anchor, and shall be inclined outward. 5.4.17 The working surface and rotating parts of the steel formwork shall be painted with anti-rust oil, and other surfaces shall be painted with anti-corrosion and anti-rust paint. Table 2 Allowable deviation of the inner cavity dimensions of steel formwork for plate components Item
Allowable deviation
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Diagonal difference
Lateral bending
Surface flatness
Height difference of panel surface
Assembly gap
Continued Table 2
L≤4200
L>4 200
End, side form and bottom form
End form and side form
Assembly end form and side form height difference
Inserted reinforcement, embedded parts
Center line displacement
Installation hole
Reserved hole
Tension plate, anchor, end form notch center line H≤200
Verticality of side form and bottom form
2003. The removable fixings and wearing parts on the steel formwork that bear the tension force shall be made of medium carbon steel and heat treated, and shall comply with the requirements of GB69.
5.2.4 The lifting device of the steel formwork shall be made of low carbon steel and shall comply with the requirements of GB700. 5. Design requirements for β steel formwork
5.3.1 The steel formwork shall first be designed according to the stiffness. Under the action of the load design value, its deformation shall comply with the requirements of Table 1 of the design allowable deformation value specified in this standard; secondly, the verification of the bearing capacity of the steel formwork and the verification of the stability of the pressure-bearing parts shall be carried out in accordance with the provisions of GBJ17 and GBJ18. Table 1 Design allowable deformation values
Bottom form panel area deflection
Bottom form warping deformation
Bottom form bending deformation
Side form bending deformation
b1/2000, and not more than 0.5
L/1500, and not more than 5
L/1500, and horizontal plate and pile formwork are not more than 3 beam and column formwork are not more than 4 values
L/2000, and horizontal plate and wall panel formwork are not more than 2.5; beam, column, pile, truss, thin-web beam formwork is not more than 3.5mm
Note: 61 in the table is the minimum span in the bottom formwork frame area, the short span in the rectangular lattice, and the minimum span through the centroid and parallel to the frame edge in the diamond lattice.
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5.3.2 The load design value is the standard load multiplied by the load partial coefficient. For stiffness design, when bearing non-prestressed loads, the partial coefficient of the self-weight load of steel bars, concrete, and formwork is 1.1, but the dynamic coefficient is not considered; when bearing prestressed loads, the partial coefficient of the prestressed tension load is 1.05; for bearing capacity verification and stability verification, when non-prestressed loads are used, the partial coefficient of the self-weight load of steel bars, concrete, and formwork is 1.2, and a dynamic coefficient of 1.4 should be considered; when bearing prestressed loads, the partial coefficient of the prestressed tension load is 1.05. For the side form lateral bending stiffness design, the horizontal load partial coefficient is 1.1, and a dynamic coefficient of 1.4 must be considered. 5.3.3 The design allowable deformation values of the grid deflection of the bottom form panel, the bottom form warping deformation, the bottom form bending deformation, and the side form bending deformation shall comply with the provisions of the table.
Manufacturing requirements for steel formwork
5.4.1 The working surface of the bottom formwork of the steel formwork should be made of integral materials. If splicing is required: when the width is less than 2m, there should be no more than one weld; when it is not less than 2m, there should be no more than two welds; when the length is less than 4.2m, there should be no more than one weld; when it is not less than 4.2m, there should be no more than two welds.
5.4.2 The main ribs of the steel formwork should be made of integral materials. If splicing is required, there should be no more than one splicing weld, and the splicing position should be at a place with less stress. The splicing welds between the main ribs should be staggered and not less than 200mm.
5.4.3 There should be no defects such as cracks, scars, and delamination on the forming working surface of the steel formwork. If there are some abrasions, rust, scratches, indentations and burns, their depth should not be greater than 0.5mm and their width should not be greater than 2mm. 5.4.4
The welds of steel formwork shall be processed in accordance with the requirements of the design drawings approved by the prescribed procedures, and the welds shall comply with the following provisions: the nodes of the steel formwork frame must be fully welded, the joints of the bottom formwork panel and the side formwork panel must be fully welded, and when the plate exceeds 8mm, groove welding must be used; the length of the welds of the assembled frame and the contact between the frame and the panel shall not be less than 40% of the total seam length. 5.4.5 The welds on the steel formwork shall comply with the welding standards GB324 and GB985. The welds on the working surface of the steel formwork shall be ground flat, and the height difference between the interface planes and between the welds and the plate surface after grinding shall not exceed 0.5mm. 5.4.6 During the manufacture of the steel formwork, effective measures shall be taken to reduce welding deformation. 5.4.7
After the steel formwork is assembled, the local maximum gap between the side formwork, end formwork and bottom formwork working surface shall not be greater than 1mm, and the cumulative length of the gap of 0.81mm shall not be greater than 25% of the joint length on each side. 5.4.8 After the steel formwork is assembled, the deformation value of its working surface under the action of tension force and load design value shall meet the design requirements of Table 1. The allowable deviation of the inner cavity size of the steel formwork for plate components shall meet the requirements of Table 2. 5.4.9
5.4.10 The allowable deviation of the inner cavity size of the steel formwork for wall panel components shall meet the requirements of Table 3. 5.4.11
The allowable deviation of the inner cavity size of the steel formwork for beam components shall meet the requirements of Table 4. 5.4.12 The allowable deviation of the inner cavity size of the steel formwork for column components shall meet the requirements of Table 5.5.4.13 The allowable deviation of the inner cavity size of the steel formwork for pile components shall meet the requirements of Table 6. 5.4.14 The allowable deviation of the inner cavity size of the steel formwork for trusses and thin-web beam components shall meet the requirements of Table 7. 5.4.15V The allowable deviation of the size between the lower edge of the notch of the prestressed steel bar anchor and the bottom form work surface shall not exceed 0~-1mm.
5.4.16 The allowable deviation of the verticality of the supporting surface of the prestressed steel bar anchor and the working surface of the bottom form shall not exceed 1/50 of the height dimension of the part in the supporting part of the prestressed steel bar anchor, and shall be inclined outward. 5.4.17 The working surface and rotating parts of the steel formwork shall be painted with anti-rust oil, and other surfaces shall be painted with anti-corrosion and anti-rust paint. Table 2 Allowable deviation of the inner cavity dimensions of steel formwork for plate components Item
Allowable deviation
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Diagonal difference
Lateral bending
Surface flatness
Height difference of panel surface
Assembly gap
Continued Table 2
L≤4200
L>4 200
End, side form and bottom form
End form and side form
Assembly end form and side form height difference
Inserted reinforcement, embedded parts
Center line displacement
Installation hole
Reserved hole
Tension plate, anchor, end form notch center line H≤200
Verticality of side form and bottom form
2004
The welds of steel formwork shall be processed in accordance with the requirements of the design drawings approved by the prescribed procedures, and the welds shall comply with the following provisions: the nodes of the steel formwork frame must be fully welded, the joints of the bottom formwork panel and the side formwork panel must be fully welded, and when the plate exceeds 8mm, groove welding must be used; the length of the welds of the assembled frame and the contact between the frame and the panel shall not be less than 40% of the total seam length. 5.4.5 The welds on the steel formwork shall comply with the welding standards GB324 and GB985. The welds on the working surface of the steel formwork shall be smoothed, and the height difference between the interface planes and between the smoothed welds and the plate surface shall not be greater than 0.5mm. 5.4.6 During the manufacture of a steel formwork, effective measures shall be taken to reduce welding deformation. 5.4.7
After the steel formwork is assembled, the local maximum gap between the side formwork, end formwork and bottom formwork working surface shall not be greater than 1mm, and the cumulative length of the gap of 0.81mm shall not be greater than 25% of the joint length on each side. 5.4.8 After the steel formwork is assembled, the deformation value of its working surface under the action of tension force and load design value shall meet the design requirements of Table 1. The allowable deviation of the inner cavity size of the steel formwork for plate components shall meet the requirements of Table 2. 5.4.9
5.4.10 The allowable deviation of the inner cavity size of the steel formwork for wall panel components shall meet the requirements of Table 3. 5.4.11
The allowable deviation of the inner cavity size of the steel formwork for beam components shall meet the requirements of Table 4. 5.4.12 The allowable deviation of the inner cavity size of the steel formwork for column components shall meet the requirements of Table 5.5.4.13 The allowable deviation of the inner cavity size of the steel formwork for pile components shall meet the requirements of Table 6. 5.4.14 The allowable deviation of the inner cavity size of the steel formwork for trusses and thin-web beam components shall meet the requirements of Table 7. 5.4.15V The allowable deviation of the size between the lower edge of the notch of the prestressed steel bar anchor and the bottom form work surface shall not exceed 0~-1mm.
5.4.16 The allowable deviation of the verticality of the supporting surface of the prestressed steel bar anchor and the working surface of the bottom form shall not exceed 1/50 of the height dimension of the part in the supporting part of the prestressed steel bar anchor, and shall be inclined outward. 5.4.17 The working surface and rotating parts of the steel formwork shall be painted with anti-rust oil, and other surfaces shall be painted with anti-corrosion and anti-rust paint. Table 2 Allowable deviation of the inner cavity dimensions of steel formwork for plate components Item
Allowable deviation
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Diagonal difference
Lateral bending
Surface flatness
Height difference of panel surface
Assembly gap
Continued Table 2
L≤4200
L>4 200
End, side form and bottom form
End form and side form
Assembly end form and side form height difference
Inserted reinforcement, embedded parts
Center line displacement
Installation hole
Reserved hole
Tension plate, anchor, end form notch center line H≤200
Verticality of side form and bottom form
2004
The welds of steel formwork shall be processed in accordance with the requirements of the design drawings approved by the prescribed procedures, and the welds shall comply with the following provisions: the nodes of the steel formwork frame must be fully welded, the joints of the bottom formwork panel and the side formwork panel must be fully welded, and when the plate exceeds 8mm, groove welding must be used; the length of the welds of the assembled frame and the contact between the frame and the panel shall not be less than 40% of the total seam length. 5.4.5 The welds on the steel formwork shall comply with the welding standards GB324 and GB985. The welds on the working surface of the steel formwork shall be smoothed, and the height difference between the interface planes and between the smoothed welds and the plate surface shall not be greater than 0.5mm. 5.4.6 During the manufacture of a steel formwork, effective measures shall be taken to reduce welding deformation. 5.4.7
After the steel formwork is assembled, the local maximum gap between the side formwork, end formwork and bottom formwork working surface shall not be greater than 1mm, and the cumulative length of the gap of 0.81mm shall not be greater than 25% of the joint length on each side. 5.4.8 After the steel formwork is assembled, the deformation value of its working surface under the action of tension force and load design value shall meet the design requirements of Table 1. The allowable deviation of the inner cavity size of the steel formwork for plate components shall meet the requirements of Table 2. 5.4.9
5.4.10 The allowable deviation of the inner cavity size of the steel formwork for wall panel components shall meet the requirements of Table 3. 5.4.11
The allowable deviation of the inner cavity size of the steel formwork for beam components shall meet the requirements of Table 4. 5.4.12 The allowable deviation of the inner cavity size of the steel formwork for column components shall meet the requirements of Table 5.5.4.13 The allowable deviation of the inner cavity size of the steel formwork for pile components shall meet the requirements of Table 6. 5.4.14 The allowable deviation of the inner cavity size of the steel formwork for trusses and thin-web beam components shall meet the requirements of Table 7. 5.4.15V The allowable deviation of the size between the lower edge of the notch of the prestressed steel bar anchor and the bottom form work surface shall not exceed 0~-1mm.
5.4.16 The allowable deviation of the verticality of the supporting surface of the prestressed steel bar anchor and the working surface of the bottom form shall not exceed 1/50 of the height dimension of the part in the supporting part of the prestressed steel bar anchor, and shall be inclined outward. 5.4.17 The working surface and rotating parts of the steel formwork shall be painted with anti-rust oil, and other surfaces shall be painted with anti-corrosion and anti-rust paint. Table 2 Allowable deviation of the inner cavity dimensions of steel formwork for plate components Item
Allowable deviation
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Diagonal difference
Lateral bending
Surface flatness
Height difference of panel surface
Assembly gap
Continued Table 2
L≤4200
L>4 200
End, side form and bottom form
End form and side form
Assembly end form and side form height difference
Inserted reinforcement, embedded parts
Center line displacement
Installation hole
Reserved hole
Tension plate, anchor, end form notch center line H≤200
Verticality of side form and bottom form
2004200
Allowable deviation
AL/1500
L/1500, and <3
Allowable deviation
L/3000
AL/1500
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