The positioning hoop of column stirrup shall not be less than three times, and the positioning of column reinforcement shall be ensured according to the measurement requirements to prevent excessive deviation of column axis after floor concrete pouring and forming.
In terms of reinforcement raw material management, the following requirements should be met: first, the connection mode of reinforcement should be determined according to the design requirements, and the actual conditions of on-site construction should be properly considered.
Rebar sub project is the general name of a series of technical work and completion entities such as ordinary rebar mobilization inspection, rebar processing, rebar connection, rebar installation, etc.
It is necessary to establish the management consciousness of “quality first, always pay attention to it”, start from the construction process, control the details, pay continuous attention to the key contents of reinforcement processing, connection, process acceptance and other links, step by step consolidate the quality management foundation, and then improve the construction quality management level of reinforcement subdivisional works on the construction site.
When there is reinforcement replacement on site, check whether the design change document is handled.
(1) The reinforcement joint should be set at the place with less stress.
Only after passing the tests can they be used for processing and production in batches.
For mechanical connections, quality certificates should include valid formal inspection reports.
Reliable anti trampling measures were not taken from the completion of installation to the pouring of concrete, and the mesh reinforcement on the upper part of the reinforcement was messy, deformed, offset, and even collapsed seriously.
During the appearance inspection of joints, special attention should be paid to the structure with seismic fortification, the reinforcement joints should be avoided within the stirrup densification area at the beam and column ends, and the overlapping method should not be used.
Before the construction of joints, whether mechanical joints or welded joints, process tests must be carried out.
rebar concealed works reflect the comprehensive quality of rebar sub project construction.
In the link of reinforcement connection, we should strengthen the key control.
The percentage of reinforcement joints shall meet the requirements of design and acceptance specifications.
As an important part of reinforced concrete structure, reinforcement engineering plays a vital role in the quality of the main structure.
The cushion block of reinforcement protective layer also does not meet the requirements.
Welders engaged in steel bar welding construction must hold the steel bar welder examination certificate and operate in accordance with the scope specified in the certificate.
The appearance quality of the joint is also a relatively easy to ignore problem, such as the electroslag pressure welding joint axis deviation is too large, the welding package is uneven, the welding slag is not cleaned and other quality defects.
In order to ensure that there is no obvious weak stress direction in the members, the hooks of beam column stirrups shall be staggered along the direction of longitudinal stress reinforcement, and the distance between the first stirrup and the column edge shall not be greater than 5cm.
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It is easy to cause the joint rate of the same connection section to exceed the limit due to the inaccurate control of reinforcement blanking at the construction site.
Third, check before use, and check the quality certificate of reinforcement raw materials.
For the inspection and acceptance of on-site reinforcement machinery, mechanical properties and bending properties of welded joints, it is necessary to check their quality certificates and sampling inspection reports first.
The binding and connection of reinforcement is also a prominent aspect with problems on site.
At the same time, when checking the reinforcement sampling re inspection report, it is important to compare the tensile strength value with the factory inspection report value, so as to meet the engineering use and specification requirements.
Second, during the on-site appearance inspection, the reinforcement surface should be free of damage, cracks, oil stains, granular or flake old rust, and spot check whether the reinforcement brand, diameter, spacing and quantity meet the requirements of the design documents.
The reinforcement connection mainly includes binding connection, mechanical connection and welding connection.
For example, the slab cushion block uses granite instead of cement cushion block, and the spacing of cushion blocks is generally too large.
The length of the stirrup densified area of the frame column of the frame structure in the seismic design is also relatively easy to cause problems.
It should be noted that the corner column of the first and second seismic grades should be densified with stirrups along the full height of the column, and the length of the stirrup densified area of the bottom column root is also different from other floors, which should not be less than 1/3 of the net height of the column of this floor.
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of different manufacturers.
As a common form used in construction engineering, reinforced concrete structure is widely used in factory buildings, residential buildings, commercial and municipal projects, urban roads, bridges, water supply and drainage stations and other construction projects in industrial and civil buildings.
Joint specimens must be intercepted from the engineering entity.
Before pouring concrete, it should be ensured that the processing, connection and installation of stressed steel bars meet the requirements of design and relevant specifications.
(2) When the joint cannot avoid the stirrup densified area at the beam end and column end, the mechanical connection joint meeting the requirements of equal strength should be used, and the percentage of reinforcement joint area should not exceed 50%.
The scope of process tests must cover the reinforcement, connectors, etc.
During on-site supervision and inspection, it should be checked whether the actual method used on site meets the requirements of the design documents.
Sampling of welded joints of electric arc welding and electroslag pressure welding.
If the connection mode changes, the design change documents should be handled.
The setting of horse stool reinforcement in reinforcement engineering is not standardized, and the quantity is relatively small.
As a reinforcement sub project which plays an important role in concrete structure, it is very important to control the physical quality of on-site construction and daily management quality behavior.
If there are three kinds of reinforcement with different diameters in the same batch, three specimens shall be cut from the joints with the largest diameter and the joints with the smallest diameter respectively for testing.
