This standard specifies the technical requirements, test methods, inspection rules, marking, stacking and transportation of precast concrete stairs for residential buildings. This standard applies to single-run and double-run staircases produced in component factories and prefabricated on site for residential buildings. JG 3002.1-1992 Precast concrete stairs for residential buildings JG3002.1-1992 Standard download decompression password: www.bzxz.net

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Construction Industry Standard of the People's Republic of China JG3002.192
Residential Stairs
Prefabricated Concrete King Stairs
Residential Stairs
Prefabricated Concrete
Published on October 10, 1992
Ministry of Construction of the People's Republic of China
Engineering Construction Standard Full Text Information System
flights
1993-06-01Implementation
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Subject Content and Scope of Application
Construction Industry Standard of the People's Republic of China Prefabricated Concrete Stairs for Residential Stairs
Residential Stairs Stair
PrefabricatedconcreteflightsJG3002.1-92
Specifies the technical requirements, test methods, inspection rules, marking, stacking and transportation of prefabricated concrete staircases (hereinafter referred to as staircases) for residential buildings.
This standard applies to single-run and double-run staircases of residential buildings produced in component factories and prefabricated on site. 2
Referenced standards
Concrete structure design code
GBJ321Precast concrete component quality inspection and assessment standardGBJ204
GBJ107
Concrete structure engineering construction and acceptance codeConcrete strength inspection and assessment standard
Building structure load code
GBJ101
Building staircase modulus coordination standard
GBJ16Building design fire prevention code
GBJ45High-rise civil building design fire protection codeJGJ37General design of civil buildings (trial)GB1499Reinforcement bars for reinforced concrete
GB1344|| tt||Slag Portland Cement, Pozzolanic Portland Cement, Fly Ash Portland Cement
Portland Cement, Ordinary Portland Cement
Quality Standard and Test Method for Sand for Ordinary Concrete JGJ53
, Quality Standard and Test Method for Crushed Stone or Pebbles for Ordinary Concrete JGJ63
Standard for Water for Concrete Mixing
JGJ56 Quality Standard and Test Method for Concrete Water Reducer GBJ119
Technical Specification for Application of Concrete Admixtures
3 Terminology
3.1 Stairs are a combination of one or more continuous flights and platforms used to connect building planes of different elevations. Ministry of Construction of the People's Republic of China Issued on October 10, 1992 Engineering Construction Standard Full Text Information System
Implementation on June 1, 1993
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3.2 Flight The combination of several continuous steps between two platforms. 3.3 Width of stair flight The horizontal distance between the edges of the flight perpendicular to the walking direction. Step The step consisting of the step surface and the step riser (or without riser). 3.4
3.5 Going The horizontal distance between the front edges of two adjacent steps. 3.6
Rise The vertical distance between the surfaces of two adjacent steps. 4
Product Classification
According to the structural type, it is divided into plate-type flight, beam-plate flight and inclined beam-shelf flight. Stair section code
Stair tread
4.2.1 The type of plate-type stair section is 1, the type of beam-plate stair section is 2, and the type of inclined beam-shelf type stair section shelf is 3. 4.3 Code for inclined beam of inclined beam-shelf type stair section
Stair section inclined beam
4.3.1 The inclined beam of inclined beam shelf type stair section without staggered steps is type 1, and the inclined beam with staggered steps is type 2. 4.4 Code example
The stair section width is 1200mm, with 7 steps. The type of plate-type stair section is 1, code: TB127-1. The horizontal projection length of the stair section inclined beam is 2400mm. The type of stair section inclined beam is 2, code: TL24-2. 5
Technical requirements
5.1 Basic requirements
5.1.1 The minimum dimension of the stair section width must comply with the provisions of JGJ37. 5.1.2 The width and height of the steps shall comply with the provisions of GBJ101. 5.1.3 The width of the stair section and the length of its horizontal projection shall comply with the provisions of GBJ101. 5.1.4 The number of steps in each stair section shall not exceed 18 and shall not be less than 3. Engineering Construction Standard Full-text Information System
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5.2 Materials
5.2.1 Constituent materials
5.2.1.1 Steel shall comply with the provisions of GB1499. 5.2.1.2 Cement shall comply with the provisions of GB1344 and GB175. 5.2.1.3 Sand shall comply with the provisions of JGJ52. 5.2.1.4 Gravel shall comply with the provisions of JGJ53. 5.2.1.5 Mixing water shall comply with the provisions of IG63 5.1.6 Admixtures shall comply with the provisions of JGJ56 and GBJ119. 5.2.2 The quality requirements for the entry, transportation, storage and processing of steel bars and concrete raw materials shall comply with the provisions of GBJ204. 5.2.3 The concrete strength grade shall not be lower than C20. The hook must be made of Class I hot-rolled steel bars that have not been cold-drawn. It is strictly forbidden to replace them with other steel bars. 5.2.4
5.3 Structural performance
The structural performance of the components shall comply with the design requirements and the provisions of Chapter 7 of GBJ321, and various test indicators shall be indicated on the design drawings.
The fire resistance requirements of the ladder section shall comply with the provisions of GBJ16 and GBJ45. Dimension deviation
The dimension deviation of the component shall comply with the provisions of Table 1. Table
Height (thickness)
Lateral bending
Surface flatness
Diagonal difference
Main reinforcement
Protective layer
Step height
Step width
Stair slab
Stair side beam
Center line offset of embedded parts
Height position of pre-prepared parts
Allowable deviation
Inspection method
Measure the parallel length part with a ruler
Measure one end or the middle with a ruler||tt ||Measure one end or the middle
Pull the wire with a ruler, measure the lateral bend from the maximum
2m ruler and wedge-shaped feeler gauge
Measure the two diagonals with a ruler
Use a ruler or special measuring instrument
Leveling ruler to measure at both ends of the board
End or middle
Measure the center line in the longitudinal and transverse directions
Measure the middle of the pre-prepared part in the thickness direction of the component Note: ①Measure the thickness of the plate-type staircase, the height of the beam of the beam-plate staircase or the inclined beam-shelf staircase; ② is the length of the staircase component.
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5.6 Appearance Quality
The appearance quality of the component shall comply with the provisions of Table 2. Item
Any part
Main stress-bearing part
Secondary part
Affect the structure
Performance and use
Do not affect the structure
Performance and use
Appearance defect
Appearance defect
Connection partwww.bzxz.net
Test method
Concrete looseness and
Embedded parts looseness
Quality requirements
Should not have
Exposed total length Should not exceed 300mm
Should not have
Should not have
Total area should not exceed 0.8% of the surface
Length of any part should not exceed 8cm
Should not have
Cracks should not exceed 0.2mm
Maximum length should not exceed 1/500
Should not exceed 3% of the surface
Should not have
Should not have
The structural performance test method should comply with the relevant provisions of GBJ321. 7
Inspection rules
7.1 Before leaving the factory, the components must be inspected by the inspection department of the manufacturer. Inspection method
Observation, measurement with ruler
Measurement with one hundred grid
Measurement with scale magnifying glass
Observation, measurement with ruler
Observation, measurement with one hundred grid
Observation, shaking
7.2 Factory inspection items: Strength, dimensional deviation, appearance quality, and structural performance of steel and concrete. 7.3 The inspection methods for dimensional deviation and appearance quality shall comply with the provisions of Table 1 and Table 2. 7. In batch and sampling
7.4.1 The same component type, the same unit project, and the same process are normally produced as a batch. 7.4.2 On the basis of the observation and inspection of the appearance quality piece by piece, 5% random sampling shall be carried out, and the total sampling quantity shall not be less than 3 pieces for appearance quality and dimensional deviation measurement inspection. 7.4.3 The structural performance shall be inspected by randomly selecting a test piece from the components normally produced in half a year. 7.5 The principles for component quality inspection and evaluation shall comply with the relevant provisions of GBJ321. 7.6 The quality inspection rules for ladder components prefabricated on the construction site can be carried out in accordance with the ladder components produced by the component factory. 8 Marking, stacking, and transportation
8.1 Marking
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8.1.1 The factory name (factory mark), product code, production date (year, month, day) and production team must be marked on the obvious part of the component, and the acceptance stamp shall be stamped according to the inspection results. 8.1.2 When the manufacturer supplies products to the purchaser, it must issue a "certificate of conformity" to deliver to the user. 8.1.3 The "certificate of conformity" shall indicate the standard number, certificate number, project name, component code, production and factory date, concrete test strength and date, weight, structural performance, and quality grade. 8.2 Stacking and transportation
8.21 The components can be lifted, stacked and transported only when the concrete strength reaches 75% of the design strength standard value. 8..2 When stacking and transporting components, the cushions should be placed near the hook and must be on the same vertical line up and down. 8..3 The number of stacked components should not exceed 5. Additional notes:
This standard was proposed by the Ministry of Construction of the People's Republic of China. This standard is under the jurisdiction of the China Building Standard Design Institute, the technical unit responsible for building structure component standards of the Ministry of Construction. This standard was drafted by the China Building Standard Design Institute and the Jiangsu Academy of Building Sciences. The main drafters of this standard: Yu Benying, Miao Liugen, Huang Ji This standard is entrusted to the China Building Standard Design Institute for interpretation. XXX
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