Method for constructing seepage prevention system of secondary cofferdam for immersed tube tunnel

A construction method and technology of immersed tunnel, applied in the field of construction engineering, can solve the problems of unpredictable hoisting operation accuracy, damage to blocks, block collision, etc., and achieve strong controllability of hoisting operation, low safety risk, and processing site. small effect

Active Publication Date: 2009-12-16
CHINA RAILWAY TUNNEL GROUP CO LTD
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  • Abstract
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Problems solved by technology

[0003] 1. Due to the heavy weight of the block itself, there are too many safety risks and uncontrollable factors during hoisting, and the accuracy of the hoisting operation cannot be accurately predicted. It is very likely that the last block of each floor cannot be lowered.
[0004] 2. It is also easy to cause block collision during hoisting, thereby destroying the concrete wall of the block, causing it to break, resulting in unpredictable consequences or affecting the construction quality
[0005] 3. The block cannot form an effective

Method used

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  • Method for constructing seepage prevention system of secondary cofferdam for immersed tube tunnel
  • Method for constructing seepage prevention system of secondary cofferdam for immersed tube tunnel
  • Method for constructing seepage prevention system of secondary cofferdam for immersed tube tunnel

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Embodiment Construction

[0054] Such as figure 1 , figure 2 , image 3 As shown, before excavating the foundation pit, the underground diaphragm wall 5 of reinforced concrete structure is firstly constructed as the enclosure structure of the foundation pit. Wall 5 is constructed directly from the ground. The main process is: first use a hydraulic grab bucket excavator to form a groove, process the steel cage as a whole on site, use a crane to hoist the steel cage into the dug groove, and finally pour concrete that meets the design requirements Excavate the interface section after the construction of the interface section diaphragm wall 5 is completed. After excavating to the design elevation, pre-embed the connecting steel bars 8 in the exposed diaphragm wall, which is the construction of the main structure 11 of the interface section and the construction of the secondary cofferdam 18. Prepare.

[0055] In the underground diaphragm wall 5 of the interface section described in construction, the pre...

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Abstract

The invention relates to a method for constructing a seepage prevention system of a secondary cofferdam for an immersed tube tunnel, belonging to the field of constructional engineering. The method includes the following steps: (1) construction and manufacturing of underground continuous walls of a joint section; (2) construction and manufacturing of the main body structure of the joint section; (3) underwater casting of the self-compacting concrete cofferdam; and (4) construction and manufacturing of seepage prevention walls. The invention has the advantages of small processing field, strong controllability of hoisting operation, high construction accuracy, favorable stability of the secondary cofferdam and watertight effect, less security risk, etc.

Description

Technical field: [0001] The invention belongs to the field of construction engineering, and in particular relates to a construction method for a secondary cofferdam anti-seepage system of an immersed tube tunnel. Background technique: [0002] At present, the secondary cofferdam of immersed tube tunnels in China usually adopts concrete block cofferdam, that is, prefabricated concrete blocks are processed in advance, and the blocks are hoisted in layers and blocks. Construction steps of the cofferdam. Since the blocks are of thin-walled structure, there is no possibility of stacking. Therefore, a large processing and stacking site is generally required. Due to the complex construction environment or a certain slope, the construction site generally does not have such conditions, and the main risks are as follows: [0003] 1. Due to the heavy weight of the block itself, there are too many safety risks and uncontrollable factors during hoisting, and the accuracy of the hoistin...

Claims

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Application Information

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IPC IPC(8): E02D29/00E02D5/18E02D29/045E02D29/063E02D19/04E02D29/16E02D15/02E02D15/06
Inventor 程晓明王光辉洪开荣李治国吴鸿军周仲贺陈海军王思凡
Owner CHINA RAILWAY TUNNEL GROUP CO LTD
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