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A method for excavating foundation pits with cofferdam enclosure and sloping suitable for deep and thick silt covering layers

A technology of covering layer and cofferdam, which is applied in basic structure engineering, earthmoving machine/shovel, construction, etc. and anti-slip force, reducing settlement and lateral displacement effect

Active Publication Date: 2022-05-24
浙江华东工程咨询有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to: propose a method for excavating foundation pits for cofferdam enclosure and sloping that is suitable for deep and thick silt covering layers, which can effectively solve the problems of deformation, settlement, and lateral movement of the cofferdam body after foundation pit excavation , and reduce the construction cost

Method used

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  • A method for excavating foundation pits with cofferdam enclosure and sloping suitable for deep and thick silt covering layers
  • A method for excavating foundation pits with cofferdam enclosure and sloping suitable for deep and thick silt covering layers
  • A method for excavating foundation pits with cofferdam enclosure and sloping suitable for deep and thick silt covering layers

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Experimental program
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Embodiment 1

[0053] Embodiment 1, first divide 5 partitions in the two cofferdam bodies 1, first carry out only the reinforcement construction of the 1st partition;

[0054] After the completion of the reinforcement construction in the 1st division, start the reinforcement construction in the 2nd division and the gravel replacement back pressure construction in the 1st division;

[0055] After the completion of the reinforcement construction in the 2nd division, start the reinforcement construction in the 3rd division, the gravel replacement and back pressure construction in the 2nd division and the dredging construction in the 1st division;

[0056] After the reinforcement construction of the 3rd division is completed, start the reinforcement construction of the 4th division, the gravel replacement and back pressure construction of the 3rd division, the dredging construction of the 2nd division, and the stratum excavation construction of the 1st division;

[0057] After the completion of ...

Embodiment 2

[0065] First, divide 10 partitions in the two cofferdam bodies 1,

[0066] Step a: During the excavation of the stratum in the (K-3) subregion, simultaneously start and implement the dredging construction in the (K-2) subregion, the gravel replacement and filling back pressure construction in the (K-1) subregion, and the Reinforcement construction of the K-th zone;

[0067] Step b: After the completion of step a, simultaneously start and implement the stratum excavation construction of the (K-2) subregion, the dredging construction of the (K-1) subregion, the gravel replacement and back pressure construction of the K subregion and the first subregion. (K+1) Reinforcement construction of partitions;

[0068] When K=1, only the reinforcement construction of the 1st partition is carried out; when K=2, after the completion of the reinforcement construction of the 1st partition, the reinforcement construction of the 2nd partition and the gravel replacement and back pressure constr...

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Abstract

The invention discloses a method for excavating foundation pits for cofferdam enclosure and sloping, which is suitable for deep and thick silt covering layers. N partitions are segmented along the length direction of the cofferdam bodies 1 between two cofferdam bodies 1, including The following steps are as follows: step a, when carrying out the ground excavation construction of the (K‑3) subregion, simultaneously start the implementation of the (K‑2) subregion’s dredging construction, and the (K‑1) subregion’s gravel replacement and backfilling pressure construction and reinforcement construction in the K-th division; step b, after the completion of the step a, simultaneously start the stratum excavation construction in the (K-2) division, the dredging construction in the (K-1) division, and the K-th division Gravel replacement and back pressure construction in subarea and reinforcement construction in (K+1) subdivision.

Description

technical field [0001] The invention relates to a water foundation pit construction method, in particular to a cofferdam enclosure grading foundation pit excavation method suitable for a deep silt covering layer. Background technique [0002] Earth-rock cofferdams are often used in water conservancy, underwater tunnels and other projects. The stability and seepage resistance of earth-rock cofferdams are crucial to the safety of the project. Cofferdams are usually built on the deep overburden layer of the river bed, and earth-rock cofferdams are built on the deep overburden layer, which has high requirements on the anti-seepage system of the cofferdam and the stability of the weir body. Factors such as seepage damage, excessive subsidence or sliding of the cofferdam foundation may lead to serious damage to the weir body, posing a serious threat to construction safety and the quality of the main building. Most of the water strata have a deep silt covering layer, and it is dif...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D19/04E02D15/08E02D5/46E02F5/28
CPCE02D19/04E02D15/08E02D5/46E02F5/28
Inventor 张强熊国宏叶武周烽淼王矿山俞伟姜东宝侯献业钱杭栖
Owner 浙江华东工程咨询有限公司
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