Connection structure between prefabricated building pile foundation and cap

Abstract

The invention discloses a connecting structure for an assembly type building pile foundation and a bearing platform. The connecting structure comprises the bearing platform, the pile foundation and a plurality of sleeves; the bearing platform is internally provided with anchoring steel bars; the pile foundation is internally provided with pre-buried steel bars, a pile foundation end plate is arranged on the pile foundation, and a plurality of through holes are formed in the pile foundation end plate; and each sleeve comprises a first sleeve body, a second sleeve body and a third sleeve body, the first sleeve bodies are vertically arranged in the through holes, inner threads which are in threaded connection with the anchoring steel bars are arranged on the inner walls of the second sleeve bodies, the second sleeve bodies are coaxially arranged in the first sleeve bodies in a sleeved mode, inner threads are arranged on the inner walls of the third sleeve bodies, the outer portions of the third sleeve bodies are divided into first portions and second portions which are distributed in a stepped mode, the first portions are located above the second portions, the outer diameters of the first portions are smaller than the outer diameters of the second portions, and the first portions extend into the first sleeve bodies and are in threaded connection with the inner walls of the first sleeve bodies. According to the connecting structure for the assembly type building pile foundation and the bearing platform, the anchoring steel bars and the pre-buried steel bars are connected through the sleeves, the butt joint strength and reliability are good, and a certain anti-seismic effect is achieved.

Description

technical field [0001] The invention relates to the technical field of building pile foundation engineering construction, and more specifically, the invention relates to a connection structure between an assembled building pile foundation and a cap. Background technique [0002] Prestressed reinforced concrete piles have the advantages of stable quality, high pile body strength, high single pile bearing capacity, low cost, short construction period, and easy quality assurance, and have been widely used in recent years. As the force-transmitting body between the pile foundation and the upper structure, the cap is mainly connected with the pile foundation in the following ways: the top of the pile foundation is directly embedded in the cap, the anchoring steel bar is welded on the end plate of the top surface of the pile foundation, and the upper and lower steel bars are connected by threaded sleeves However, there are defects in several connection methods: the pile foundation...

AI Technical Summary

Problems solved by technology

As the force-transmitting body between the pile foundation and the upper structure, the cap is mainly connected with the pile foundation in the following ways: the top of the pile foundation is directly embedded in the cap, the anchoring steel bar is welded on the end plate of the top surface of the pile foundation, and the upper and lower steel bars are connected by threaded sleeves However, there are defects in several connection methods: the pile foundation top is directly buried in the cap. The construction of the connection method is simple, but the buried length needs to be calculated accurately. If the buried length is too short, it cannot meet the tensile strength requirements, and if the buried length is too If it is long, it will increase the investment cost; the connection method of welding and anchoring steel bars on the end plate of the top surface of the pile foundation requires a large amount of welding work on site, poor quality and reliability, and discontinuous stress. The stress direction of the steel bar is vertical, which will easily lead to tearing failure of the weld. Although the structure and method are feasible through the threaded sleeve connection, it is mainly suitable for the horizontal butt joint of the steel bar. For the vertical butt joint of the steel bar, due to the length of the vertical steel bar The longer it is, the more difficult it is to align, and it is not easy to screw the operation, and after the butt joint is completely supported by the strength of the screw sleeve, the requirements for the screw sleeve are higher. Once the screw sleeve breaks, it is easy to cause irreparable losses

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