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

A technology of pouring concrete and post-tensioning prestressing, which is applied in the field of concrete structure rods or walls, can solve the problems that the anchoring effect cannot be guaranteed, and achieve the effects of durability guarantee, steel saving, and no pollution to the environment

Active Publication Date: 2012-12-05
TIANJIN RES INST OF BUILDING SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

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Embodiment

[0054] The pouring concrete structure of the present invention has bonded post-tensioning prestressed anchorage construction method, which solves the cracks caused by the buoyancy of groundwater to the tensile stress of the reinforced concrete structure of the underground building, and at the same time makes the tensioned prestressed steel strand permanently bonded with the concrete . It uses the design unit to design the reinforcement ratio of reinforced concrete structures in underground engineering, and determines the configuration of steel bars and prestressed steel strands and the design of prestressed length. The realization of prestressing is to make the steel cage of the underground structure, place the steel check valve at the bottom of the steel conduit, connect the steel cage, cast the concrete in place, insert the prestressed steel strand, build the underground structure, wait for the concrete After the structure is formed and the maintenance period is reached, the...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D15/04
Inventor 杜冰郑秀娟胡德均李斌王毅倪浩宋彻张大煦贺宏钟刚刘冬冬
Owner TIANJIN RES INST OF BUILDING SCI
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