Construction method of foundation pit supporting water-stop continuous wall

A water-stop diaphragm wall and construction method technology, which is applied in foundation structure engineering, excavation, sheet pile walls, etc., to achieve the effects of low cost, strong water-retaining and anti-seepage performance, and simple structure

Inactive Publication Date: 2019-11-19
辽宁省有色地质一〇五队有限责任公司
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Problems solved by technology

[0003] In order to solve the structural strength and water-retaining and anti-seepage problems of the diaphragm wall of the underground foundation pit, the present invention proposes a construction method for the diaphragm wall supporting the foundation pit

Method used

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  • Construction method of foundation pit supporting water-stop continuous wall
  • Construction method of foundation pit supporting water-stop continuous wall
  • Construction method of foundation pit supporting water-stop continuous wall

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Embodiment Construction

[0015] As shown in the figure, in the foundation pit, there are overlapping three-axis mixing piles 1 and support piles 2 arranged coaxially at fixed intervals, and a steel bar structure is set to form a continuous wall.

[0016] The three-axis mixing piles overlap and overlap to form a three-axis mixing wall, and the three-axis mixing pile machine is used to construct the water-stop curtain of the foundation pit. The pile diameter of the three-axis mixing piles is ￠650mm, and the pile spacing is 0.9m. For compound-stirring connection construction, the length of the pile entering the strong weathered rock shall not be less than 1.0m. The three-axis mixing pile adopts 42.5 grade ordinary Portland cement, the cement content is not less than 20%, and the soil weight is 1.9T / m 3 Considering comprehensively, the water-cement ratio should be 1:1. The 28d unconfined compressive strength of the cement-soil wall is not less than 0.8Mpa. During the construction process, due to overtim...

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Abstract

The invention provides a construction method of a foundation pit supporting water-stop continuous wall. Over-lapped triaxial stirring piles and support piles arranged in a coaxial line according to fixed spaces, and reinforcing steel bar structures are arranged in a foundation pit so as to form a continuous wall body. The triaxial stirring piles are overlapped to form a triaxial stirring wall. Thesupport piles are constructed on a center line after the triaxial stirring wall is constructed; the triaxial stirring piles and the support piles are in the coaxial line; the pile diameter of each support pile is larger than the pile diameter of each stirring pile; and reinforcing steel bar structures are arranged in a matching way. The support piles are constructed by adopting a high-power longspiral drilling machine and a rotary drilling rig. Foundation pit supporting and water stopping are combined so as to form the continuous complete seamless water-retaining seepage-proofing undergroundcontinuous wall body with a certain strength and rigidity; the foundation pit supporting water-stop continuous wall is simple in structure, reliable in strength, high in water-retaining and seepage-proofing performances, simple in construction, low in cost, low in environment pollution, and particularly suitable for deep foundation pit engineering in the city. The invention is suitable to be applied as the construction method of the foundation pit supporting water-stop continuous wall.

Description

technical field [0001] The invention proposes a construction method for an underground foundation pit continuous wall in the field of construction, which is mainly applied to cement-soil mixing pile walls, and specifically a construction method for a foundation pit supporting a water-stop continuous wall. Background technique [0002] At present, the conventional construction of the foundation pit water-stop curtain is to make the support piles first and then the water-stop wall. The general net distance is 200mm, not on the same axis, and there are the following disadvantages: the soil between the support piles is easy to fall off during excavation Affect the support effect; the soil between the support piles needs to be treated with anchor spraying; when the anchor cable holes seep water, the leak point is not easy to find, and it is difficult to seal; the deformation of the support piles during the soil retaining process is easy to compress the water stop Cracked and wate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/18E02D17/04E02D19/18
CPCE02D5/187E02D17/04E02D19/185
Inventor 于贵王禹张云峰李明伯张扬李超李龙
Owner 辽宁省有色地质一〇五队有限责任公司
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