Combined built-in type connecting structure between prefabricated pier column and base and construction method

Abstract

The invention relates to a combined built-in connection structure between a prefabricated pier column and a base and a construction method thereof, the combined built-in connection structure is provided with the prefabricated pier column and the base, a built-in groove is formed in the upper part of the base, shear nails and connecting steel bars are pre-embedded in the side walls of the built-in groove and the built-in column, and the prefabricated pier column is composed of a pier column body and the built-in column; pier column main reinforcements are distributed along the outer side wall of the pier column body and penetrate out of the bottom of the pier column body, connecting reinforcements are pre-buried in the built-in groove and the built-in column, the built-in column and the built-in groove are connected through a bedding or grouting method, post-cast strip concrete is poured on the peripheries of the built-in groove and the built-in column, and built-in connection between the prefabricated pier column and a base is achieved. The built-in depth of the prefabricated pier column is obviously reduced, and extra thickening of the base is not needed; the connecting structure is clear in axial force, shearing force and bending moment transmission mechanism and reliable in stress; the connection between the built-in groove and the built-in column is relatively strong, the integrity is good, the construction pouring is convenient, and the quality is convenient to control; meanwhile, the connecting structure is extremely high in construction speed, good in seam durability and low in cost.

Description

technical field [0001] The invention relates to the field of bridge construction, in particular to an embedded connection structure combined with a prefabricated pier column and a base and a construction method. Background technique [0002] The prefabricated assembly construction technology of bridge substructure engineering has been developed abroad for decades, and the technology has been continuously improved; , Highway engineering has been widely used. Due to the differences in engineering structure, design methods, and seismic theories in various fields, the joint construction schemes of prefabricated piers are different. The commonly used connection methods include casing grouting connection and prestressed connection. , Embedded connection, etc., the characteristics of each scheme are different, and the applicable conditions and scope are different. [0003] Among them, the traditional embedded connection means that an embedded groove is reserved during the foundati...

AI Technical Summary

Problems solved by technology

[0004] 1. The embedding depth of prefabricated pier columns is large. Due to the requirement of force, the embedding depth of pier columns generally needs to be more than 1 times the size of pier columns. The size of bridge engineering pier columns is relatively large, and the size of pier bodies generally needs to be about 2m or even larger. If The traditional embedding method requires a large embedding depth, and the thickness of the foundation needs to be increased accordingly, resulting in an increase in the amount of work and inconvenience to the construction of pier columns and foundations;

[0005] 2. After pouring high-strength concrete between the pier column and the embedding groove, when the pier column is stressed, especially under the action of an earthquake, the "prying" effect produced by the pier column is not good for the thin layer of post-poured concrete, and its stress state and seismic effect are not good. Clearly, limits the applicability of this form of connection;

[0006] 3. A thin layer of high-strength concrete is poured between the pier column and the embedding groove, and two construction joints are formed between it and the prefabricated pier column and between the cast-in-place foundation. Due to the influence of shrinkage and creep between different materials, there is a risk of cracking at the connection surface. It will affect the integrity of the embedded connection, and it will be unfavorable to the stiffness of the pier column, etc.

Images