Bonded post-tensioned prestressed anchoring construction method for cast-in-place concrete structure

Abstract

The invention discloses a bonded post-tensioned prestressed anchoring construction method for a cast-in-place concrete structure. The method comprises the following steps of: manufacturing and placing a steel bar cage, a steel conduit end check valve and cast-in-place concrete to form an underground structure, descending a prestressed steel strand to a design connecting part after the underground structure is molded and reaches the age, and tensioning the steel strand, anchoring and relaxing an end and grouting in a steel conduit by using special equipment, so that a prestressed steel bar is protected, and bonded connection is realized. The problem that a pile and an underground continuous wall bear buoyant force and horizontal force is solved; for the underground continuous wall which bears high bending moment, the problem that the wall on the side with higher bending moment is cracked is solved; steel is saved, the structure is easy and convenient to construct, environment is not polluted, the working surface and the construction period are not influenced, the quality guarantee rate is high, and the prestressed steel strand is inserted in a short time when the concrete is poured; and a bonded prestress applying mode is realized, the prestressed steel strand can be protected, and the durability of the underground structure is guaranteed.

Description

technical field [0001] The present invention relates to a new structural structure and construction method of underground poured concrete structures, which is a method of increasing the tensile stress of steel strands after underground poured concrete structures (concrete piles, concrete walls) and making the prestressed strands sticky. The knot is combined with the concrete structure to form a concrete structure rod or wall with precompression stress. Background technique [0002] In recent years, with the increasing development of the national economy and the acceleration of urban construction, the number of high-rise and super high-rise buildings is increasing, and the foundation is buried deeper and deeper. At the same time, the development and utilization of underground space structures such as basements of garage buildings or relatively independent underground structures and subway stations are becoming more and more extensive. Due to the effect of groundwater on the ...

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Problems solved by technology

[0004] In the application of prestress, the anchoring method of the lower end mainly adopts the method of directly inserting into the concrete. The difficulty of this method is to determine the insertion depth. Due to the inhomogeneity of the concrete, the anchoring effect cannot be guaranteed

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