This standard specifies the technical requirements, test methods, inspection rules, marking, transportation and stacking of precast concrete intermediate platforms for residential stairs. This standard applies to intermediate platforms of residential buildings that are produced in component factories and prefabricated on site. JG 3002.2-1982 Precast concrete intermediate platforms for residential stairs JG3002.2-1982 Standard download decompression password: www.bzxz.net

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Engineering Construction Standard Full Text Information System
People's Republic of China Construction Industry Standard JG3002.2—92
Residentialstair
Prefabricated
1992—10—10
Engineering Construction Standard Full Text Information System
m/p-07439008181763.html?s=rel&id=5concrete intermediate landingsConstruction Standard
1993—0601
Engineering Construction Standard Full Text Information System
Prefabricated
Residential stair
concrete
elandings
intermediate
3002.2-92
This standard specifies the technical requirements, test methods, inspection rules, marking, transportation and stacking of precast concrete intermediate landings (hereinafter referred to as intermediate landings) for residential stairs. This standard applies to intermediate landings of residential buildings produced in component factories and prefabricated on site. 2
GBJ321
GBJ204
GBJ107
Concrete structure design code
Precast concrete component quality inspection and assessment standardConcrete structure engineering construction and acceptance codeConcrete strength inspection and assessment standard
Building structure load code
GBJ101
GB1499
GB1344
GBJ119
Standard for coordination of building staircase modulus
Building design fire protection code
Fire protection design code for high-rise civil buildings
Rebar for reinforced concrete
Slag Portland Cement, Pozzolanic Portland Cement, Pulverized Steel Fly ash Portland cement Portland cement, ordinary Portland cement
Quality standard and test method for sand used in ordinary concrete Quality standard and test method for crushed stone or pebbles used in ordinary concrete Water standard for concrete mixing
Quality standard and test method for concrete water reducing agent Water standard for concrete mixing
Quality standard and test method for concrete water reducing agent Technical specification for application of concrete admixture
1992—10—10
Engineering Construction Standard Full Text Information System
1993—06—01
Engineering Construction Standard Full Text Information System
Stairs (Stair) are a combination of several continuous flights and platforms, used to connect building planes of different elevations. 3.2 Landing (Landing) The horizontal part connecting the floor and the end of the flight. 3.3
Intermediate landing (Intermediate landing) The platform located between two floors. 3.4 Platform width (Width of landing) The horizontal distance between the edge of the platform and the end edge of the stair section perpendicular to the walking direction.
According to the structural type, it is divided into a plate-type intermediate platform and a beam-slab intermediate platform. 4.1
4.2 Intermediate platform code
Axis distance between bays
Intermediate platform plate
4.2.1 The plate-type intermediate platform type is 1, and the beam-slab intermediate platform type is 2. 4.3 Code example
The axis distance between the bays of the staircase is 2400mm, and the beam-slab intermediate platform type is 2, code: ZB24-2. 5
5.1 Basic requirements
5.1.1 The dimensioning of the length of the intermediate platform must comply with the provisions of GBJ101. 5.1.2 The net width of the intermediate platform handrail should be larger than the net width of the stair section. 5.2 Materials
5.2.1 Component 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 Stone shall comply with the provisions of JGJ53. 5.2.1.5 Mixing water shall comply with the provisions of JGJ63. 5.2.1.6 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 strength grade of concrete shall not be lower than C20. 5.2.4 The hook must be made of Grade I hot-rolled steel bars that have not been cold-drawn. It is strictly forbidden to replace them with other steel bars. Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
5.3 Structural Performance
The structural performance of the components shall comply with the design requirements and the provisions of Chapter VII of GBJ321, and the various test indicators shall be indicated in the design drawings.
5.4 The fire resistance requirements of the intermediate platform shall comply with the provisions of GBJ16 and GBJ45. 5.5 Dimension Deviation
The dimension deviation of the component shall comply with the provisions of Table 1. Table 1
Lateral Bending
Surface Flatness
Diagonal Difference
Main Reinforcement Protective Layer
Reserved Holes
Embedded Parts
Note: ① is the length of the intermediate platform component;
②Surface refers to the upper surface.
Appearance quality
Center line offset
Center line offset
Height position
The appearance quality of the component shall comply with the provisions of Table 2. Item
Any part
Main force-bearing part
Secondary part
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Allowance deviation
Quality requirements
Should not have
Inspection method
Measure the parallel length part
Measure one end or the middle
Measure one end or the middle
Pull the wire and use a ruler to measure the maximum lateral bending||tt ||Measure with a 2m ruler and a wedge-shaped feeler gauge
Measure the two diagonals with a ruler
Use a ruler or a special measuring instrument
Measure at both ends of the plate with a leveling ruler
Measure the center lines in the longitudinal and transverse directions with a ruler
Measure the center lines in the longitudinal and transverse directions with a ruler
Measure the middle of the embedded parts with a ruler at the thickness position of the component Inspection method
Observe and measure with a ruler
The total exposed length should not exceed 300m m
Should not have
Should not have
Total area not exceeding 0.8% of the surface
Length of any part not exceeding 8cm
Hundred grid measurement
Engineering construction standard full text information system
Affecting the structure
Performance and use
Does not affect the structure
Performance and use
Appearance defects
Appearance defects||tt ||Surface contamination
Connection
Concrete looseness and
Embedded parts looseness
Quality requirements
Should not have
Cracks should not exceed 0.2mm
Maximum length should not exceed 1/500
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
Before leaving the factory, the components must be inspected by the inspection department of the manufacturer. Inspection methodsbZxz.net
Observation with a scale magnifying glass
Measurement with a ruler
Observation, measurement with a 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. 7.4 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 appearance quality piece by piece, 5% random sampling shall be carried out, and the total sampling 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 the intermediate platform components prefabricated on the construction site can be carried out in accordance with the intermediate platform produced by the component factory. 8
8.1 Marking
8.1.1 The factory name (factory logo), 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 purchasing unit, it must issue a "certificate of conformity" 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, structural performance, and quality grade.
8.2 Stacking and transportation
8.2.1 Components can only be lifted, stacked, and transported when the concrete strength reaches 75% of the design strength standard value. Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
8.2.2 When stacking and transporting components, the pads should be placed near the hook and must be on the same vertical line up and down. 8.2.3 The number of stacked components should not exceed 7 layers. This standard is proposed by the Ministry of Construction of the People's Republic of China. This standard is under the jurisdiction of the China Building Technology Development Research Center, 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 Architectural Science. The main drafters of this standard: Yu Benying, Miao Liugen, and Huang Ji This standard is entrusted to the China Building Standard Design Institute for interpretation. Engineering Construction Standard Full-text Information System
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