Composite supporting method used for ultra-deep comprehensive pipe rack foundation ditch in water crossing riverway

A technology of integrated pipe gallery and composite support, applied in excavation, hydraulic engineering, underwater structures, etc., can solve the problem of large excavation depth of the pipe gallery, and achieve the effect of reducing support costs and reducing machinery

Inactive Publication Date: 2018-12-07
CHINA MCC17 GRP
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  • Application Information

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Problems solved by technology

However, the top surface of the pipe gallery structure is at least 1m away from the bottom of the river channel, and the distance is generally more than 2m. The maximum relative d

Method used

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  • Composite supporting method used for ultra-deep comprehensive pipe rack foundation ditch in water crossing riverway

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Example Embodiment

[0031] Example 1

[0032] In this embodiment, a composite support method for foundation grooves of ultra-deep comprehensive pipe galleries in water-passing channels, the steps are as follows:

[0033] Firstly, the excavation line of the foundation pit is released on site according to the excavation design drawing of the foundation pit, and the river cofferdam is constructed outside the sliding surface of the foundation pit (the height of the cofferdam must be greater than the maximum water level of the river channel), and the slope slope on both sides of the cofferdam needs to be in accordance with the retaining wall Perform a stability check. Drainage pipes are erected between the upstream and downstream cofferdams, and the drainage pipes are installed with steel pipes. After the upstream and downstream cofferdams and drainage pipes are constructed, the machinery enters the cofferdams for dredging work ( figure 1 Middle 4). Upper foundation pit ( figure 1 Middle 5) Slope ...

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Abstract

The invention discloses a composite supporting method used for an ultra-deep comprehensive pipe rack foundation ditch in a water crossing riverway, and belongs to the technical field of underground urban comprehensive pipe rack deep foundation pit supporting. The method comprises the steps that firstly, a riverway cofferdam is constructed, and a drainage tube is mounted; secondly, riverway dredging within the construction range is carried out; thirdly, slope excavation to the top of a cast-in-place pile is carried out; fourthly, slope surface soil nails are put, and jet-anchor execution is carried out; fifthly, cast-in-situ bored pile construction is carried out; sixthly, a crown beam is constructed; seventhly, a pile back side high-pressure rotary jet grouting waterstop curtain is constructed; ninthly, excavation of foundation pit and construction of a crossed pipe rack main structure are carried out, after the lower foundation pit supporting and maintaining period is finished, earthwork on the foundation pit on the lower portion begins to be excavated and constructed, the earthwork is dug to the bottom at a time, and crossed main body structure is constructed. The currently-conventional supporting method is combined, supporting structure reliability is improved, construction cost is reduced, the construction proceed is quickened, and the influence on the environment and watercan be reduced.

Description

technical field [0001] The invention relates to the technical field of deep foundation pit support of an underground urban comprehensive pipe gallery, and more specifically relates to a composite support method for foundation grooves of an ultra-deep comprehensive pipe gallery in a water-passing channel. Background technique [0002] At present, in domestic comprehensive pipe gallery projects, there are few cases of passing under the river. In similar projects, shield tunneling and pipe jacking are mainly used to pass under the river to reduce the impact on the river and the surrounding environment. However, the construction cost of the shield tunneling method or the pipe jacking method is extremely high, and in order to prevent the top from collapsing during shield tunneling, the penetration depth is generally deeper under the river channel, which has caused certain problems for the excavation and support of the pipe gallery interface on both sides of the river channel. dif...

Claims

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Application Information

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IPC IPC(8): E02D17/02E02D19/04E02D17/04E02D5/76E02D29/045
CPCE02D17/02E02D5/76E02D17/04E02D19/04E02D29/10
Inventor 吴建国揭恒杨赛
Owner CHINA MCC17 GRP
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