Narrow and long open caisson of thick soft soil layer and construction method thereof

A construction method, narrow and long technology, applied in the direction of caisson, foundation structure engineering, sheet pile wall, etc., can solve problems such as inclination and difficulty in ensuring the stability of large caisson sinking, so as to improve the strength of the soil layer and prevent the uplift damage of the soil layer , the effect of preventing seepage damage

Inactive Publication Date: 2020-04-03
广州市第三市政工程有限公司
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Problems solved by technology

[0003] However, this method is difficult to ensure the stability of the large caisson sin

Method used

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  • Narrow and long open caisson of thick soft soil layer and construction method thereof
  • Narrow and long open caisson of thick soft soil layer and construction method thereof
  • Narrow and long open caisson of thick soft soil layer and construction method thereof

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Embodiment Construction

[0047] The present invention will be further described below in conjunction with the accompanying drawings and the following embodiments.

[0048] The embodiment of the first aspect of the present invention provides a support structure, such as Figure 1-Figure 5 As shown, the narrow and long caisson section 1 for supporting thick soft soil layer, wherein, the section 1 is a hollow cuboid, which includes opposite first side 21 and second side 22, and opposite The third side 31 and the fourth side 32 , the lengths of the first and second sides 21 , 22 are greater than the lengths of the third and fourth sides 31 , 32 .

[0049] The support structure is detachably connected to the segment 1, including: a first support member vertically abutted between the first side 21 and the second side 22; and a second support , two ends of the second supporting member abut against two adjacent side surfaces respectively.

[0050] Among them, the first support member offsets the force of th...

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PUM

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Abstract

The invention provides a narrow and long open caisson of a thick soft soil layer and a construction method thereof and relates to the technical field of open caisson construction. The open caisson isformed by splicing a plurality of segments. The method comprises the following steps of S1, setting the position of the open caisson, and arranging a cement mixing pile on a soil layer at the open caisson to reinforce the soil layer; S2, manufacturing the first segment above the soil layer; S3, draining away water in an in-well area and cutting earth till the segment descends to a position which is a preset distance from the ground; S4, manufacturing the next segment contrapuntally on the manufactured segment S5, draining away water in an in-well area and cutting earth till the next segment descends to a position which is a preset distance from the ground; S6, repeating the steps 4-5 till all segments are manufactured; and S7, carrying out grouting to the bottom of the open caisson and sealing the bottom. Phenomena such as bottom heave and sedimentation of soil layers around the open caisson due to a too large water pressure in the open caisson in the sinking process can be prevented.

Description

technical field [0001] The invention relates to the technical field of caisson construction, in particular to a narrow and long caisson in thick soft soil layers and a construction method thereof. Background technique [0002] The thick soft soil layer has the characteristics of high natural water content, low strength, easy uplift of the bottom of the pit, and return of quicksand, so it is difficult to carry out caisson construction. In Chen Guoping's "Construction Technology and Application of Caisson Subsidence in Soft Soil Foundation", a caisson construction method is proposed, which uses heavy well point dewatering as an auxiliary process to consolidate the silt while reducing the groundwater level, so as to ensure the solidification after consolidation. The soil quality can satisfy the sinking of the caisson. [0003] However, this method is difficult to ensure the stability of the large caisson sinking, and the caisson may be tilted under the action of soft soil when...

Claims

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Application Information

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IPC IPC(8): E02D15/08E02D23/00E02D23/08E02D5/46
CPCE02D5/46E02D15/08E02D23/00E02D23/08
Inventor 邱庚鸿何德华陈建宁黄金铭袁程郭一贤曹钰邹嘉威
Owner 广州市第三市政工程有限公司
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