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Dry cutting method of steel pipe plug piles in foundation pits in cofferdams of immersed tunnels

A technology of steel pipes for immersed tunnels and foundation pits, which can be applied to sheet pile walls, foundation structure engineering, construction, etc., and can solve problems such as unsatisfactory construction progress

Inactive Publication Date: 2017-09-15
CHINA RAILWAY TUNNEL GROUP CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] During the implementation of the project with the above method, due to factors such as land acquisition, delay in demolition, and high water level in the Ganjiang River, the construction progress is not satisfactory

Method used

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  • Dry cutting method of steel pipe plug piles in foundation pits in cofferdams of immersed tunnels

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Embodiment Construction

[0029] The specific embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0030] Such as figure 1 Shown in detail, the dry cutting method of steel pipe plug piles in foundation pit in the cofferdam of immersed tunnel tunnel provided by the present invention is specified, and the method comprises:

[0031] Step 1, cofferdam filling step

[0032] The cofferdam is a sand-filled long-tube bag cofferdam, and the long-tube sandbags are filled with sand by sand ship + sand pump ship + laying ship. During this period, the process construction of auxiliary works such as plastic concrete cut-off wall and cofferdam slope protection will be interspersed. The overall filling sequence includes construction of long sand-filled pipes and sandbags divided into two working faces, and construction is carried out from the middle of the waterside side of the cofferdam along the axis to the shorelines on both sides.

[003...

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Abstract

The invention relates to the technical field of immersed tube tunnel construction, in particular to a dry cutting method for a foundation pit steel tube plug pile in an immersed tube tunnel cofferdam. The dry cutting method for the foundation pit steel tube plug pile in the immersed tube tunnel cofferdam comprises the steps that slope excavation is performed on the three faces of the periphery of a steel tube pile located in the cofferdam in an open foundation pit excavation mode through the water retaining effect of the cofferdam, and after excavation is performed until the required elevation of steel tube pile cutting is achieved, drying cutting is performed on the steel tube pile; by adjusting the construction method for cutting the plug steel tube pile, the construction procedures comprise the steps of cofferdam filling, open excavation of a foundation pit support under a shore and main body backfilling, dry cutting of the plug steel tube pile, cofferdam dismantling, lower cofferdam foundation trench excavating and butt-joint connecting between an immersed tube and a hidden burying section. According to the method, the distance between the plug steel tube pile and the butt-joint position is shortened, the project amount of open excavation of the foundation pit support under the shore and the project amount of cofferdam filling and dismantling are decreased, the filling length of the cofferdam is shortened, and steel tube pile cutting under water is avoided; due to the fact that a traditional excavator is mainly adopted to perform construction, the construction effect and the economic benefit are significant.

Description

technical field [0001] The invention relates to the technical field of immersed tube tunnel construction, in particular to a method for cutting steel pipe plug piles in foundation pits in cofferdams of immersed tube tunnels. Background technique [0002] Immersed tube tunnels in the prior art have a construction history of more than 100 years in various countries in the world. China introduced this technology in the late 1990s. At present, there are only more than 10 immersed tube tunnels in China. Therefore, the design of immersed tube tunnels , Construction technology research and innovation have great value and significance. The current common design method for the butt joint section of immersed tubes in China is as follows: the butt joint point between the immersed tube and the open-cut and buried section is set on the subshore beach. In order to ensure the construction safety of the open-cut and buried section under the bank, a cofferdam is set up around the open-cut a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D9/04
CPCE02D9/04E02D2250/0061
Inventor 何毅刘国秀赵宝锋张振亚时思鹏李志军牛瑞张柯周兆勇刘敏卢柯良王厚涛蒋树锋李少贤安斌曹露平闫丁灿张小莉张君王政程斌
Owner CHINA RAILWAY TUNNEL GROUP CO LTD
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