Recyclable group bundle post-tensioning unbonded prestress underground diaphragm wall and construction method

An underground diaphragm wall and construction method technology, which is applied in the direction of foundation structure engineering, sheet pile walls, buildings, etc., can solve the problems of rising, steel waste cost, etc., and achieve the effect of reducing consumption, reducing construction cost, and improving crack resistance

Inactive Publication Date: 2018-09-28
SHANGHAI CONSTRUCTION GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, this feature is not utilized to recycle the reinforcement of the difference between the construction stage and the use stage of the underground diaphragm wall, resulting in the waste of steel and the increase of cost

Method used

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  • Recyclable group bundle post-tensioning unbonded prestress underground diaphragm wall and construction method
  • Recyclable group bundle post-tensioning unbonded prestress underground diaphragm wall and construction method
  • Recyclable group bundle post-tensioning unbonded prestress underground diaphragm wall and construction method

Examples

Experimental program
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Effect test

Embodiment 1

[0044] see Figure 1 to Figure 11 , the present embodiment provides a method for the construction of post-tensioned unbonded prestressed underground diaphragm walls with recoverable groups, including:

[0045] Assembling the prestressed bundle 1 and the porous fixed-end anchor 2 to form a prestressed bundle assembly, the lower end of the prestressed bundle 1 is installed in the porous fixed-end anchor 2, and each prestressed bundle 1 includes Several working cables 110 for applying prestress to the underground diaphragm wall and tool cables 120 for unanchoring the working cables 110, the working cables 110 are arranged around the outside of the tool cables 120, and the tool cables 120 and The working cables 110 are linear unbonded prestressed tendons, and the unbonded prestressed tendons include steel strands and sheath tubes set outside the steel strands, and the porous fixed end anchor 2 can anchor It can also release the steel strand 111 of the anchor working cable 110;

...

Embodiment 2

[0066] read on Figure 1 to Figure 11 , the present embodiment discloses a recoverable post-tensioned unbonded prestressed underground diaphragm wall, comprising several underground diaphragm wall sections 4, adjacent underground diaphragm wall sections 4 are connected by joints, and the underground diaphragm wall sections 4 include Reinforcement cage (not shown) and several prestressed cluster components, the prestressed cluster components are formed by assembling the prestressed cluster 1 and the porous fixed end anchorage 2, and the upper end of the prestressed cluster 1 protrudes from the underground diaphragm wall The top surface of the section 4, the lower end of the prestressed bundle 1 is installed in the porous fixed end anchorage 2, each prestressed bundle 1 includes a number of working cables 110 for applying prestress to the underground continuous wall and A tool cable 120 for unanchoring the working cable 110, the working cable 110 is arranged around the outside o...

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Abstract

The invention provides a recyclable group bundle post-tensioning unbonded prestress underground diaphragm wall and a construction method. A prestress group bundle is arranged in a reinforcement cage,wherein the prestress group bundle is used for bearing the load in the construction process of an underground structure. The lower end of the prestress group bundle is provided with a multi-hole fixing end anchor device which can anchor and disanchor a steel strand of a working cable. The upper end of the prestress group bundle extends out of the top face of an underground diaphragm wall segment and is sequentially provided with an anchor backing plate and a stretching and drawing end anchor device. After pouring of the underground diaphragm wall segment is completed and before the undergroundstructure is constructed, the steel strand of the working cable in the prestress group bundle is stretched and drawn; the crack resistance degree of the underground diaphragm wall is raised; the surface fracture of the underground diaphragm wall is reduced; consumption of common rebars is reduced; the weight of the underground diaphragm wall reinforcement cage is reduced; and the reinforcement cage hoisting difficulty and risk are lowered. After construction of the underground structure is completed, the steel strand of the tool cable is withdrawn; so that the steel strand of the working cable is disanchored through the multi-hole fixing end anchor device, and thus recycling and reuse of the steel strand of the working cable are achieved; and the construction cost is lowered.

Description

technical field [0001] The invention relates to engineering fields such as building foundation pits, underground structures, water conservancy and hydropower, mines, environmental protection, and harbors, and in particular to a recyclable post-tensioned unbonded prestressed underground continuous wall and a construction method. Background technique [0002] The underground diaphragm wall construction method, also known as the concrete curtain method, is to excavate a trench of a certain length on the ground along the periphery of the proposed underground structure or the foundation pit of a high-rise building with a special trenching machine in the state of the mud retaining wall, and then Hang the reinforcement cage into the trench, and pour concrete in the trench filled with mud with the conduit method. The concrete is gradually poured upward from the bottom of the trench, and the mud is replaced at the same time, forming a reinforced concrete wall section underground, that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/18E02D5/74
CPCE02D5/187E02D5/74
Inventor 胡祖光侯建青
Owner SHANGHAI CONSTRUCTION GROUP
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