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Method for connecting slotted sections in underground construction of diaphragm wall

An underground diaphragm wall, a technology in construction, applied to sheet pile walls, foundation structure engineering, construction, etc., can solve problems such as complex construction, water seepage in concrete joints, difficult safety, etc., to ensure construction quality, prevent soil collapse, Solve the effect of anti-circumvention

Inactive Publication Date: 2009-10-21
GUANGDONG PROVINCIAL CHANGDA HIGHWAY ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to preliminary empirical estimates, in an ideal vertical state, the sum of the self-weight of the locking tube and the frictional resistance of the side wall that needs to be overcome when pulling out the locking tube is more than 600 tons. The test of the bearing capacity of the wall is quite large. Due to the welding quality of the pipe body material or the insufficient strength of the back seat of the guide wall, the risk of the lock pipe being pulled out or the pipe buried will be greatly increased. Therefore, due to the factor of the large wall depth , for the construction of ultra-deep rock-socketed underground diaphragm wall, it is very difficult to pull out the pipe, and a guide wall with high rigidity is needed, and it is often difficult to pull out the pipe due to reasons such as the time of pulling out the pipe, the construction plan, and the pulling out machine, which affects the construction quality and causes concrete damage. Due to construction phenomena such as anti-circumvention and joint water seepage, the conventional underground diaphragm wall joint construction method is complex in construction, long in construction period, poor in quality, and difficult to guarantee safety, which directly restricts the popularization and application of underground diaphragm wall foundations in large bridges and other foundations.

Method used

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  • Method for connecting slotted sections in underground construction of diaphragm wall
  • Method for connecting slotted sections in underground construction of diaphragm wall
  • Method for connecting slotted sections in underground construction of diaphragm wall

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Embodiment Construction

[0017] The south anchor of the south branch of the Huangpu Bridge on the Pearl River is located on the south bank. It is a gravity anchor. The ground connection wall adopts a circular structure with an outer diameter of 73m, an inner diameter of 70.6m, and a wall thickness of 1.2m. The underground diaphragm wall is divided into 50 groove sections with two groove shapes in total, and the overlapping length of the groove sections between Phase II and Phase I is 0.25m. The method for connecting groove sections in the construction of the underground diaphragm wall of the south anchorage of the Huangpu Bridge on the Pearl River includes the following steps:

[0018] ① if figure 1 , figure 2 As shown, build the guide wall and construction platform: build an "L" shaped reinforced concrete structure guide wall 1 on the inner and outer sides of the location 2 of the underground diaphragm wall on the ground 4, and set a reinforced concrete construction platform 3 with a certain thickn...

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Abstract

The invention discloses a method for connecting slotted sections in underground construction of diaphragm wall of 'deep wall, large thickness and needing rock-socketed' applied to large acale bridges and construction foundation pit excavation. The method comprises the following steps: establishing a guide wall and a construction platform; constructing I phase slotted section of the diaphragm wall; constructing of a slotted eye of II phase slotted section of the diaphragm and jagged section surface of the I phase slotted section; forming an underground diaphragm wall; cleaning and brushing the wall of the II phase slotted section repeatedly up and down by a special steel brush carried by a hydraulic grab, until the steel brush does not have obvious spare, deposit on the bottom of the eye does not increase; releasing a reinforcing cage and casting concrete so as to complete the connection of I phase slotted section and II phase slotted section after the II phase slotted section is completed; forming a complete diaphragm wall after connection. After the method is adopted, the progress of the construction of the underground diaphragm wall is greatly improved; construction cost is saved; construction problems, such as concrete circumferential motion prevention, water seepage in seam and the like can be completely solved by the jagged connection section so as to improve construction quality and safety reliability.

Description

technical field [0001] The invention relates to a construction method of an underground diaphragm wall in the excavation of large bridges and building foundation pits, in particular to an underground diaphragm wall construction groove for large bridges and buildings with "deep walls, large thickness, and rock insertion" method of linking segments. Background technique [0002] The traditional commonly used joint types of underground diaphragm walls mainly include drilling connection, joint pipe connection, water-stop structure and rigid connection structure in the joint, etc. Among them, the joint pipe method is the most common method. When this method is used, it is difficult to pull out the lock pipe of the ultra-deep underground diaphragm wall. According to preliminary empirical estimates, in an ideal vertical state, the sum of the self-weight of the locking tube and the frictional resistance of the side wall that needs to be overcome when pulling out the locking tube is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/18
Inventor 谭立心刘宏波李斌冯炳生程建阳钱亮钟建锋邓冠强陈凤同吴聪
Owner GUANGDONG PROVINCIAL CHANGDA HIGHWAY ENG
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