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Multi-section anchored prestressed tendon underground diaphragm wall structure and its construction method

A technology of underground diaphragm walls and prestressed tendons, which is applied in foundation structure engineering, excavation, and sheet pile walls, etc., can solve problems such as deformation and displacement of prestressed tendons, affect anchorage effect, and concrete is easily broken, so as to improve local pressure bearing ability, avoiding the risk of anchorage failure, and improving the effect of connection reliability

Active Publication Date: 2018-12-07
SHANGHAI CONSTRUCTION GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a multi-section anchoring prestressed tendon underground diaphragm wall structure and its construction method, which is used to solve the problem that the concrete at the anchorage at the fixed end is easily broken and affects the anchoring effect and the prestressed tendons are easily deformed during the hoisting process in the prior art. displacement problem

Method used

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  • Multi-section anchored prestressed tendon underground diaphragm wall structure and its construction method
  • Multi-section anchored prestressed tendon underground diaphragm wall structure and its construction method
  • Multi-section anchored prestressed tendon underground diaphragm wall structure and its construction method

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Embodiment 1

[0040] see Figure 1 to Figure 7 , this embodiment discloses a multi-section anchoring prestressed tendon 2 underground continuous wall structure, including a concrete wall 1 made of cast-in-place concrete, and the concrete wall 1 includes concrete and a reinforcement cage (not shown) set on the concrete And a post-tensioned prestressed system arranged vertically, the post-tensioned prestressed system includes prestressed tendons 2 and tension end anchors 3 and fixed end anchors 4 respectively arranged at both ends of the prestressed tendons 2, the The tension end anchor 3 is located at the top of the concrete wall 1, and the fixed end anchor 4 is located at the bottom of the concrete wall 1. The fixed end anchor 4 includes an extrusion anchor 41 and an end bearing plate 42 from bottom to top. , end pressure spiral ribs 43 and at least one group of middle pressure components, the middle pressure components include several screws 44, middle pressure plates 45, middle pressure s...

Embodiment 2

[0061] read on Figure 8 to Figure 9 , and can be combined with reference Figure 1 to Figure 7 The difference between this embodiment and Embodiment 1 is that the number of screw rods 44 in the middle pressure assembly is four, and at least two or more prestressed tendons 2 are anchored in the same fixed-end anchor 4, and the two More than one prestressed tendon 2 is arranged at intervals along a straight line, and the end-bearing spiral ribs 43 and the middle pressure-bearing spiral ribs 46 are both rectangular spiral ribs and are all wound around the overall outer side of the at least two or more prestressed tendons 2 , the middle pressure plate 45 and the end pressure plate 42 are rectangular, and the four corners of the middle pressure plate 45 and the end pressure plate 42 are provided with through holes for the screw rod 44 to pass through. The end pressure plate 42 is provided with a number of circular grooves 48 corresponding to the prestressed tendons 2 one by one, ...

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Abstract

The invention provides a multi-segment anchorage underground continuous wall structure for the prestressed reinforcements and a construction method of the multi-segment anchorage underground continuous wall structure, relates to the technical field of construction engineering, and is used for solving the problems that prestressed reinforcements are easy to deform and displace in the hoisting process, and the anchorage effect is affected due to the fact that the concrete at the fixed end anchor is easy to break in the prior art. According to the underground continuous wall structure, a post-tensioned prestressed system is vertically arranged on a steel reinforcement cage of a concrete wall, besides the extrusion anchors, end pressure bearing plates and end pressure bearing spiral bars at the fixed end of the prestressed reinforcements, at least one set of medium pressure bearing assembly is further arranged, the medium pressure bearing assembly includes a plurality of screw rods, the sum of the number of the end pressure bearing plates and the medium pressure bearing plates is equal to the sum of the number of the segments of the multi-segment anchorage, the local pressure bearing capacity of the prestressed reinforcements is improved by using the concrete of the longitudinal depth of the prestressed reinforcements, and the anchor failure risk due to the local loss of the concrete is avoided.

Description

technical field [0001] The invention belongs to the technical field of construction engineering, and in particular relates to an underground continuous wall structure and a construction method thereof. Background technique [0002] Diaphragm wall, as one of the common forms of retaining walls for deep foundation pit support, has been widely used in high-rise buildings, municipal engineering and other underground foundation pit enclosure structures. However, as the excavation of the foundation pit becomes deeper and deeper, the water and soil pressure on the enclosure structure is increasing. In order to achieve sufficient strength and rigidity, it is necessary to increase the thickness of the underground diaphragm wall and reduce the distance between supports, which not only increases the The cost of the enclosure structure also increases the difficulty of construction. Prestressed underground diaphragm wall is the application of prestressing technology in the design and co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D5/18E02D17/04
CPCE02D5/187E02D17/04
Inventor 龚剑侯建青胡祖光
Owner SHANGHAI CONSTRUCTION GROUP