Recyclable single-bundle post-tensioning non-bonding prestress underground diaphragm wall and construction method

A technology of underground diaphragm wall and construction method, which is applied in the direction of foundation structure engineering, sheet pile wall, construction, etc., can solve the problems of rising, steel waste cost, etc., and achieve the effect of reducing consumption, reducing construction cost, and reducing difficulty and risk of hoisting

Pending Publication Date: 2018-08-10
SHANGHAI CONSTRUCTION GROUP +1
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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 single-bundle post-tensioning non-bonding prestress underground diaphragm wall and construction method
  • Recyclable single-bundle post-tensioning non-bonding prestress underground diaphragm wall and construction method
  • Recyclable single-bundle post-tensioning non-bonding prestress underground diaphragm wall and construction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] see Figure 1 to Figure 9 , this embodiment discloses a construction method for recyclable single-bundle post-tensioned unbonded prestressed underground diaphragm wall, including:

[0043] trench section excavation construction;

[0044] Hoist the steel cage 2 with several prestressed tendons 1 into the groove section, each prestressed tendon 1 is installed on the reinforced cage 2 in a U-shape, and the two ends of the prestressed tendons 1 protrude from the proposed underground continuous wall section 3 Each prestressed tendon 1 is an unbonded prestressed tendon 1, and the unbonded prestressed tendon 1 includes an outer casing 101 and a steel strand 102 arranged in the outer casing 101; a reinforcement cage 2 The overall design reinforcement of the prestressed tendon 1 is determined according to the internal force of the underground diaphragm wall during the construction of the underground structure, and the design of the reinforcement cage 2 is determined according t...

Embodiment 2

[0062] read on Figure 1 to Figure 9 , this embodiment discloses a recyclable single-bundle post-tensioned unbonded prestressed underground diaphragm wall, comprising several underground diaphragm wall sections 3, adjacent underground diaphragm wall sections 3 are connected by joints, and the underground diaphragm wall sections 3 include Reinforcement cage 2 and several prestressed tendons 1, each prestressed tendon 1 opening is U-shaped and installed on the reinforcement cage 2, the two ends of the prestressed tendons 1 protrude from the top surface of the underground continuous wall section 3, each The prestressed tendon 1 is an unbonded prestressed tendon 1 , and the unbonded prestressed tendon 1 includes an outer casing 101 and a steel strand 102 arranged in the outer casing 101 .

[0063] In the use stage after the construction of the underground structure is completed, the internal force on the underground diaphragm wall is reduced. Even if the steel strand 102 in the pr...

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Abstract

The invention provides a recyclable single-bundle post-tensioning non-bonding prestress underground diaphragm wall and a construction method. Prestressed ribs are arranged in a reinforcement cage, andafter concrete pouring to the underground diaphragm wall section is finished and the designed strength is reached, tensioning of the prestressed ribs is conducted, the crack resistance degree of theunderground diaphragm wall is improved, the fracture surface of the underground diaphragm wall is reduced, the usage amount of ordinary steel bars is reduced, the weight of the reinforcement cage of the underground diaphragm wall is reduced, and the reinforcement cage hoisting difficulty and risks are reduced. In addition, due to the fact that each prestressed rib is a non-bonding prestressed rib,each non-bonding prestressed rib comprises an outer casing pipe and a steel strand arranged in the outer casing pipe, the prestressed ribs are arranged on the reinforcement cage in a U shape manner,the two ends of each prestressed rib stretch out of the top face of the underground diaphragm wall section planned to be built, and after underground structure construction is finished, the steel strands of the prestressed ribs are unloaded and recycled, the steel strands can be repeatedly utilized, and the construction cost is reduced.

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 single-bundle 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 und...

Claims

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Application Information

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