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

Abstract

The invention discloses a bonded post-tensioned prestressed construction method for a cast-in-place reinforced concrete structure. The method comprises the following steps of: determining prestress applying length by using a design unit; manufacturing, placing and connecting a steel bar cage, placing a steel conduit end, an automatic locking anchoring tool and cast-in-place concrete to form an underground structure, descending a prestressed steel strand to a design connecting part after the concrete structure is molded and reaches the age, and tensioning the steel strand, anchoring and relaxing the end and post-grouting in a steel conduit by using special equipment, so that 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 is not influenced, the quality guarantee rate is high, and prestress applying time is not limited by construction time; and a bonded prestress applying mode is realized, the prestressed steel strand is protected, and the durability of the underground structure is guaranteed.

Description

technical field [0001] The invention relates to a new structural structure and construction method of underground poured reinforced concrete structures, which is a method of increasing the tensile stress of steel strands after underground poured reinforced concrete structures (concrete piles, concrete walls) and prestressing strands The bonded one is combined with the concrete structure to form a reinforced 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 ground...

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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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