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Industry Standard of the People's Republic of China
Technical specification for plywood formwithsteelframe
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Industry Standard of the People's Republic of China
Technical specification for plywood formwithsteelframe
Technical specification for plywood formwithsteelframe
JGJ96—95
Editing department: China Academy of Building ResearchApproving department: Ministry of Construction of the People's Republic of ChinaEffective date: October 1, 1995
Notice on the promulgation of the industry standard "Technical Specification for Plywood Formwork with Steel Frame"
Construction Standard [1995] No. 47
Construction Committees (Construction Departments) of provinces, autonomous regions, and municipalities directly under the Central Government, Construction Committees of cities with independent planning status, and the State Council. Relevant departments:
According to the requirements of the Ministry of Construction's (90) Jianbiao No. 407 document, the "Technical Code for Steel Frame Plywood Formwork" edited by the China Academy of Building Research has been reviewed and approved as an industry standard, numbered JGJ96-95, and will be implemented from October 1, 1995. This standard is managed and interpreted by the China Academy of Building Research, the technical authority for construction engineering standards of the Ministry of Construction, and is published by the Standard and Norms Research Institute of the Ministry of Construction. Ministry of Construction of the People's Republic of China
February 8, 1995
China Construction Information Network
2.1 Steel
2.2 Plywood
Formwork design
3.1 General provisions
3.2 Load
3.3 Formwork design
Formwork production and inspection
4.1 Steel frame production and inspection
4.2 Panel production and inspection
4.3 Formwork production and inspection.
5 Formwork construction
5.1 Construction preparation
5.2 Installation and removal
5.3 Quality inspection and acceptance
6 Transportation, maintenance and storage
6.1 Transportation
Maintenance and Storage
Appendix A
Appendix B
Appendix C
Appendix D
Appendix E
Appendix F
Steel frame plywood formwork construction
Main technical properties of plywood for concrete formwork Steel frame and steel rib material warehouse
Mechanical properties table
Strength and stiffness calculation formula of formwork panel, steel frame and steel rib 16 Calculation formula of formwork support and spare parts
Terms used in this code
Additional instructions
1 General
1.0.1: This code is formulated to actively promote the application of steel frame plywood formwork in concrete construction, ensure the quality of its design, production and construction, and achieve advanced technology, economic rationality, safety and applicability.
1.0.2 This code is applicable to cast-in-place and precast concrete structures and components. Design, production, construction and technical management of steel frame plywood formwork for use. Precast concrete components that are not suitable for steam curing. 1.0.3 The steel frame plywood formwork consists of a panel, a steel frame (primary ribs, secondary ribs, (Appendix A), and is used in conjunction with spare parts. The panel of the steel frame plywood formwork is wood plywood. If the panel is made of other materials, refer to the relevant provisions of this code for implementation. 1.0.4 In addition to complying with the provisions of this code, the design, production and construction of steel frame plywood formwork shall also comply with the provisions of the current national standards and specifications. China Construction Information Network
2 Materials
2.1 Steel
2.1.1 The steel frame and various steel accessories of the formwork shall comply with the provisions of the current national standard "Steel Frame Plywood Formwork".
2.1.2 The steel used for the formwork shall have a factory certificate, quality assurance certificate or test report, and shall be inspected and tested in accordance with relevant national standards. Received.
2.1.3 The type, specification and model of the welding rod used for welding shall be compatible with the quality and INOA
specifications of the weldment and shall comply with the relevant national standards. 2.2 Plywood
2.2.1 The technical performance of the steel frame plywood formwork panel shall comply with the requirements of Appendix B of this regulation.
2.2.2 The working surface of the plywood shall have a complete and firm phenolic resin mask or other masks with better performance than phenolic resin. The physical properties of the plywood mask shall comply with the provisions of the current national standard "Steel Vertebra Plywood Formwork". The mask shall preferably adopt the pressing film process.
2.2.3 The cut surface of the plywood (including the wall) shall be sealed with edge sealing paint. The quality of the edge sealing paint and the sealing process shall ensure the sealing and waterproofing of the cut surface of the plywood Requirements. 2.2.4 When plywood enters the factory, the factory certificate and mechanical properties table should be kept, and acceptance should be carried out in accordance with the provisions of Appendix B and the current national standard "Determination of moisture content of plywood". 3 Formwork design
3.1 General provisions
3.1.1 The formwork design should carry out strength and stiffness calculations, and the stability verification during the construction process should also be considered. The ultimate deflection value of the formwork shall meet the requirements of the flatness of the concrete surface.
3.1.2 The structure and construction of the formwork should meet the requirements of strong versatility, flexible assembly and disassembly, easy modification. Tight joints, convenient storage and transportation. 3.1.3 The strength design value and elastic modulus of the steel frame shall be taken in accordance with the current national standard "Steel Structure Design Code" (Appendix C). 3.1.4 The strength design value of the plywood shall be the static bending strength of the plywood. The coefficient of strength divided by 1.55: the modulus of elasticity should be multiplied by a coefficient of 0.9. The standard value of the integral strength and modulus of elasticity of plywood should be taken according to Appendix B. When the mechanical index of plywood determined by the specified sampling test method is greater than the value in Appendix B, it can be taken according to the test value. 3.1.5 When the panel is composed of several pieces of plywood, the joint seam should be added with supporting ribs to fix the panel.
The distance between the connection point of the panel and the edge rib should not be greater than 300mm. 3.1.6
The arm of the main rib supported on the steel rib should not be greater than 250mm. The main ribs supporting the plywood are perpendicular to each other in the direction of the fibers of the plywood surface. The template design drawings and instructions should include the production drawings, assembly drawings, support system drawings, disassembly and assembly procedures and maintenance and repair instructions, and be filed for reference. When designing an over-length template, the influence of temperature difference should be considered. 3.1.10
The formwork design shall have the following technical documents: engineering design drawings and instructions
Requirements for formwork design and use in construction organization design. 3.2 Load
3.2.1 The load borne by the steel frame plywood formwork shall be calculated and determined in accordance with the provisions of the current national standard "Concrete Structure Engineering Construction and Acceptance Code". 3.2.2 When designing the strength of the steel frame plywood formwork, the load design value shall be the standard simplified load multiplied by the load partial coefficient, and the load standard value shall be taken when designing the stiffness. The self-weight load partial coefficient G of the steel bar, concrete and formwork is taken as 1.2, and the live load partial coefficient c is taken as 1.4;
3.2.3 When the steel frame plywood formwork is designed for anti-overturning, the self-weight partial coefficient YG of the formwork shall be taken as 1.0.
3.2.4 The standard value of the horizontal wind load shall be adopted in accordance with the relevant provisions of the current national standard "Building Structure Load Code".
3.2.5 The load on the support system of the formwork shall be calculated and determined in accordance with the provisions of the "National Current Standard Concrete Structure Engineering Construction and Acceptance Code". When the upper part of the structure supported by the horizontal formwork continues to pour concrete, the load transferred from the upper part shall also be considered. 3.3 Formwork design
3.3.1: The specifications and quantity of the formwork shall be determined according to the engineering construction drawings and construction organization design.
3.3.2 The strength and stiffness analysis and calculation of the formwork panel shall comply with the following provisions: 3.3.2.1 The formwork panel can be analyzed and calculated for strength and stiffness according to the one-way board in the fiber direction of the surface plate.
3.3.2.2 The calculated value of the stiffness of each span of the formwork panel should not be greater than 1/300 of the corresponding span of the panel, and should not be greater than 1mm
3.3.2.3 The strength and stiffness of the formwork panel with a span of not more than five spans can be analyzed and calculated according to the formula in Appendix D of this code, and those with more than five spans can be analyzed and calculated according to five spans.
3.3.3 The strength and stiffness design calculation of the main ribs, secondary ribs and side ribs of the formwork shall comply with the following provisions:
The main ribs perpendicular to the fiber direction of the panel shall be pulled through, and the secondary ribs parallel to the fiber direction of the panel may be welded to the main ribs in sections. 3.3.3.2 The main ribs perpendicular to the fiber direction of the panel may be analyzed and calculated for strength and stiffness as beams under the uniformly distributed load in the span direction. The uniformly distributed load value of the main ribs in the span direction is equal to the uniformly distributed load value of the panel multiplied by the spacing of the main ribs. The secondary ribs parallel to the fiber direction of the panel may not be analyzed and calculated for strength and stiffness. 3.3.3.3 The calculated deflection value of the main ribs perpendicular to the fiber direction of the panel should not be greater than 1/500 of the span of the main rib, and should not be greater than 1.5mm. 3.3.3.4 The main ribs can be supported by steel or wood ribs. 3.3.3.5 The main ribs can be directly analyzed and calculated for strength and stiffness using the formulas given in Appendix D.
3.3.4 The strength and stiffness analysis and calculation of steel ribs can be carried out in accordance with the following provisions c3.3.4.1 The strength and stiffness analysis and calculation of steel ribs can be carried out as beams subjected to concentrated loads from the main ribs, and their strength design values and elastic modulus should be used in accordance with Appendix C. The concentrated load value is equal to the uniformly distributed load along the span direction of the main rib multiplied by the spacing between steel ribs or the supporting range of the steel ribs, but the construction load part should be taken in accordance with the current national standard "Concrete Structure Engineering Construction and Acceptance Code".
3.3.4.2 The calculated deflection value of each span of the steel rib should not be greater than 1/1000 of the corresponding span of the steel rib, and should not be greater than 1mm.
3.3.4.3 The support of the steel ribs can be rods, columns or column hoops. 3.3.4.4 The strength and rigidity of steel ribs can be analyzed and calculated using the formula shown in Appendix D of this Code.
3.3.5 The stability calculation of the support of steel ribs can be carried out using Appendix E of this Code. The analysis and calculation of its strength and rigidity shall be carried out in accordance with the current national standard "Code for Design of Steel Structures".
3.3.8 Large templates should be set with points. The location of the hanging points should be reasonable to ensure that the template does not produce permanent deformation during the hoisting process
4 Template production and inspection
4.1 Steel frame production and inspection
4.1.1 The steel frame shall be processed and manufactured according to the template production drawing. The raw materials such as the side ribs, main ribs, and secondary ribs of the steel frame shall be straightened and cut and processed according to the drawings, and then corrected. 4.1.2 The production of steel frames shall strengthen product quality management. A combination of self-inspection, handover inspection and full-time inspection shall be adopted. After passing the inspection, the steel frame shall be promptly subjected to surface anti-rust treatment and panel installation, and finally the finished product quality inspection shall be carried out. 4.1.3 Measures should be taken for welding of steel frames to reduce welding deformation and shaping and correction workload.
4.1.4 The weld should meet the design requirements, and the weld surface should be uniform to prevent defects such as leaking, slag inclusion, undercut, pores, cracks, and dislocation. 4.1.5 The steel frame should be shaped by shaping machines after welding. When manual shaping is used, the side ribs of the formwork should not be damaged.
4.1.6 The parts used for steel frame plywood formwork should comply with the provisions of the current national standard "Steel Frame Plywood Formwork".
4.2 Panel production and inspection
4.2.1 Before panel processing, the quality inspection of the type and specification of the plywood should be carried out, and the panel should be cut according to the fiber direction of the surface plate marked on the drawing. 4.2.2 The panel cutting and processing shall be carried out indoors under dry conditions, and the moisture content of the plywood shall not be increased during processing.
4.2.3 The cutting shall be carried out with special equipment to ensure the panel size accuracy and the flushness of the cutting line, and the surface film shall not be damaged.
4.2.4 The panel opening shall have reliable process measures to ensure that the hole periphery is neat and the surface film is free of cracks: it shall not damage the bonding between the plywood layers. 4.2.5
All cut surfaces shall be sealed with edge sealing paint in time after the panel is processed. The inspection before the panel is delivered for installation after cutting shall meet the following requirements: 4.2.6.1
The panel specifications shall correspond to the finished steel frame: the panel hole position shall be consistent with the hole position on the steel frame. When using the tension screws, the corresponding hole position and hole diameter of the template shall be consistent; the cutting surface and the hole wall shall be sealed completely and reliably.
4.3 Template production and inspection
4.3.1. The plywood panel shall be installed and fixed on the steel frame according to the design drawings. The installation quality shall meet the following requirements:
4.3.1.1 The screws or rivets are firm and reliable,
4.3.1.2 The head of the countersunk screw is flush with the board surface: 4.3.1.3 The panel surface film shall not be damaged,
4.3.1.4 The flatness of the board surface shall comply with the relevant provisions of the current national standard "Standards for Inspection and Assessment of Construction Engineering Quality":
4.3.1.5 The joints around the panel are tight and leak-proof. 4.3.2 The product quality standards and inspection methods of the formwork shall be implemented in accordance with the provisions of the current national standard "Steel Frame Plywood Formwork". 4.3.3 Special accessories (such as special-shaped connectors, special-shaped tension bolts, external tie rods, connecting fasteners for adjustable formwork, reverse and forward threaded adjustable rods, and trapezoidal threaded accessories, etc.) shall be processed according to the manufacturing drawings and allowed to leave the factory after passing the inspection according to the corresponding national standards. 5 Formwork construction 5.1 Construction preparation 5.1.1. A detailed list of types, specifications and quantities of formwork, supports and spare parts should be prepared according to the construction organization design: technical and safety measures should be formulated, and detailed written and oral instructions should be given to the operators. 5.1.2. The types, specifications and quantities of the formwork, supports and spare parts entering the site should be checked and quality acceptance should be carried out in accordance with the provisions of the current national standard "Steel Frame Plywood Formwork". 5.1.3. Any changes in construction technology and safety measures should be reviewed and approved by the relevant technical departments. 5.1.4. The construction site should have reliable measurement control points that can meet the needs of formwork installation and inspection. 5.1.5. The site for stacking formwork should be dense and flat, the base soil at the bottom of the formwork support must be solid, and drainage measures should be taken.
5.1.6 When the formwork needs to be pre-assembled, the assembly quality acceptance should be carried out in accordance with the relevant provisions of the current national standard "Concrete Structure Engineering Construction and Acceptance Code". 5.1.7 An isolation agent with good isolation performance, no pollution, simple operation, and no corrosion to the formwork surface should be selected.
5.2 Installation and removal
5.2.1 The formwork hoisting method is determined by the shape and size of the formwork. Special-shaped formwork should be hoisted with special hoists.
5.2.2 The formwork hoisting should be tested and officially hoisted only after confirming that there are no problems. During the hoisting process, it is forbidden for the formwork surface to rub and collide with hard objects. 5.2.3, the installation of the formwork should be carried out according to the prescribed procedures, and the stability of the formwork during the installation process should be ensured.1
The panel specifications should correspond to the finished steel frame: the panel holes should be consistent with the holes on the steel frame. When using tension screws, the corresponding hole positions and diameters of the template should be consistent; the cutting surface and hole wall are sealed completely and reliably.
4.3 Template production and inspection
4.3.1. The plywood panel should be installed and fixed on the steel frame according to the design drawings. The installation quality should meet the following requirements:
4.3.1.1 The screws or rivets are firm and reliable,
4.3.1.2 The head of the countersunk screw is flush with the board surface:4.3.1.3 The panel mask should not be damaged,
4.3.1.4 The flatness of the board surface meets the relevant provisions of the current national standard "Standards for Inspection and Assessment of Construction Engineering Quality":
4.3.1.5 The joints around the panel are tight and leak-proof. 4.3.2 The product quality standards and inspection methods of the formwork shall be implemented in accordance with the provisions of the current national standard "Steel Frame Plywood Formwork". 4.3.3 Special accessories (such as special-shaped connectors, special-shaped tension bolts, external tie rods, connecting fasteners of adjustable formwork, adjustable rods with reverse and forward threads, and trapezoidal thread accessories, etc.) shall be processed according to the production drawings and allowed to leave the factory after passing the inspection according to the corresponding national standards. National
5 Formwork construction
5.1 Construction preparation
5.1.1, A detailed list of types, specifications and quantities of formwork, support and spare parts shall be prepared according to the construction organization design: formulate technical and safety measures, and make detailed written and oral instructions to the operators.
5.1.2 The types, specifications and quantities of the formwork, support and spare parts entering the site shall be checked and quality acceptance shall be carried out in accordance with the provisions of the current national standard "Steel Frame Plywood Formwork". 5.1.3 Any changes in construction technology and safety measures shall be reviewed and approved by the relevant technical departments.
5.1.4 The construction site should have reliable measurement control points that can meet the needs of template installation and inspection.
5.1.5 The site for stacking templates should be dense and flat, the base soil at the bottom of the template support must be solid, and drainage measures should be taken.
5.1.6 When the template needs to be pre-assembled, the assembly quality acceptance should be carried out in accordance with the relevant provisions of the current national standard "Concrete Structure Engineering Construction and Acceptance Code". 5.1.7 Isolation agents with good isolation performance, no dirty beams, simple operation, and no corrosion to the template surface should be selected.
5.2 Installation and removalbZxz.net
5.2.1 Template hoisting method is determined by the shape and size of the template. Special-shaped templates should be hoisted with special hoists.
5.2.2 The template hoisting should be tested and officially hoisted after confirming that there is no problem. During the hoisting process, it is forbidden to rub and collide with hard objects. 5.2.3. The installation of the template should be carried out according to the prescribed procedures and the stability of the template should be ensured during the installation process.1
The panel specifications should correspond to the finished steel frame: the panel holes should be consistent with the holes on the steel frame. When using tension screws, the corresponding hole positions and diameters of the template should be consistent; the cutting surface and hole wall are sealed completely and reliably.
4.3 Template production and inspection
4.3.1. The plywood panel should be installed and fixed on the steel frame according to the design drawings. The installation quality should meet the following requirements:
4.3.1.1 The screws or rivets are firm and reliable,
4.3.1.2 The head of the countersunk screw is flush with the board surface:4.3.1.3 The panel mask should not be damaged,
4.3.1.4 The flatness of the board surface meets the relevant provisions of the current national standard "Standards for Inspection and Assessment of Construction Engineering Quality":
4.3.1.5 The joints around the panel are tight and leak-proof. 4.3.2 The product quality standards and inspection methods of the formwork shall be implemented in accordance with the provisions of the current national standard "Steel Frame Plywood Formwork". 4.3.3 Special accessories (such as special-shaped connectors, special-shaped tension bolts, external tie rods, connecting fasteners of adjustable formwork, adjustable rods with reverse and forward threads, and trapezoidal thread accessories, etc.) shall be processed according to the production drawings and allowed to leave the factory after passing the inspection according to the corresponding national standards. National
5 Formwork construction
5.1 Construction preparation
5.1.1, A detailed list of types, specifications and quantities of formwork, support and spare parts shall be prepared according to the construction organization design: formulate technical and safety measures, and make detailed written and oral instructions to the operators.
5.1.2 The types, specifications and quantities of the formwork, support and spare parts entering the site shall be checked and quality acceptance shall be carried out in accordance with the provisions of the current national standard "Steel Frame Plywood Formwork". 5.1.3 Any changes in construction technology and safety measures shall be reviewed and approved by the relevant technical departments.
5.1.4 The construction site should have reliable measurement control points that can meet the needs of template installation and inspection.
5.1.5 The site for stacking templates should be dense and flat, the base soil at the bottom of the template support must be solid, and drainage measures should be taken.
5.1.6 When the template needs to be pre-assembled, the assembly quality acceptance should be carried out in accordance with the relevant provisions of the current national standard "Concrete Structure Engineering Construction and Acceptance Code". 5.1.7 Isolation agents with good isolation performance, no dirty beams, simple operation, and no corrosion to the template surface should be selected.
5.2 Installation and removal
5.2.1 Template hoisting method is determined by the shape and size of the template. Special-shaped templates should be hoisted with special hoists.
5.2.2 The template hoisting should be tested and officially hoisted after confirming that there is no problem. During the hoisting process, it is forbidden to rub and collide with hard objects. 5.2.3. The installation of the template should be carried out according to the prescribed procedures and the stability of the template should be ensured during the installation process.
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