Welding process for wall bars of steel bar cage

Abstract

The invention provides a welding process for wall bars of a steel bar cage. The process particularly comprises the steps of arranging welding of two main reinforcements after a main reinforcement of the entire steel cage is laid. The main reinforcement and two side bars of reinforcement cage are welded at 90 degree or 135 degree. The welding process has the advantages of easy on-site construction,easy operation, high welding qualification rate, and can meet the design requirements of standard specifications.

Description

technical field [0001] The invention relates to the technical field of reinforcement cage welding for civil engineering pile foundations, in particular to a welding process for side bars for reinforcement cages. Background technique [0002] Reinforcement cages have a wide range of applications. Due to the different fields of use, there are differences in their performance and strength requirements. In pile foundation construction, the process of rebar lapping will directly affect the quality of the finished reinforcement cage, and then affect the bearing capacity of the pile foundation; In the construction industry with high reinforcement ratio, the performance index will also increase the joint strength to a large extent, and will not affect the normal progress of concrete pouring due to over-density reinforcement, etc. The existence of these differences will cause differences in the structure of the reinforcement cage. , in order to improve its strength and other indicato...

AI Technical Summary

Problems solved by technology

The influence of the thickness of the protective layer is mainly that the thickness of the protective layer is reduced, which will cause the main reinforcement and hoops to rust in advance and accelerate the development of corrosion. However, the protective layer of the steel bar is a passivation film, and the main reason for the destruction of the passivation film is It is carbonized, and the time of the carbonization process is proportional to the thickness of the passivation film. It can be seen that the thickness of the passivation film is one of the important factors for the durability of the steel cage; the reason why the passivation film will be destroyed in advance is mainly due to the bonding around the steel bar. The cracks caused by the slip develop to the surface of the reinforcement cage, forming cracks along the longitudinal reinforcement, causing the concrete of the protective layer to split and destroy, resulting in the failure of the strength of the reinforcement to fully exert its effect, and the split cracks pose a serious threat to the corrosion of the reinforcement. This also directly affects the durability of the structure; in addition, the lap welding performance of the main reinforcement affects the connection strength of the reinforcement on the reinforcement cage, thus directly affecting the mechanical properties of reinforced concrete

[0004] In order to improve the performance of the existing steel cage, when welding the steel bars it is composed of, the connection strength of the main bars can be significantly improved by using side bar welding. It is easy to operate. Therefore, the existing welding applied to the connection of the reinforcement cage is generally 180° and 90° between the two side bars and the main reinforcement. This welding method will affect the performance of the reinforcement cage when the reinforcement cage is used, such as attached figure 1 The two installation methods shown, if the first welding method is not conducive to operation, the second welding method is not conducive to the long-term use of the reinforcement cage after installation. Therefore, the above two methods will have adverse effects

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