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Karst cave foundation pit supporting construction method

A foundation pit support and construction method technology, which is applied in the direction of foundation structure engineering, excavation, sheet pile walls, etc., can solve problems such as uneven force, foundation instability, collapse of karst cave roof, etc., and achieve the effect of reducing concrete filling and reinforcement The effect of increasing and reducing costs

Inactive Publication Date: 2020-04-17
GUANGDONG NO 1 CONSTRUCTION ENGINEERING CO LTD
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Problems solved by technology

[0002] Karst landforms are widely distributed in my country, and there are caves in the rock mass. These natural soil caves and karst caves are extremely uneven in size and distribution. In such areas, the foundation is very likely to encounter soil caves and karst caves, that is, Uneven stress can easily cause foundation instability and subsidence. When the scale of the cave is large, the buried depth is shallow, and the roof of the cave cannot bear the load of the building, the roof of the cave will collapse and the foundation will become unstable, causing large economic losses. , how to strengthen the foundation pit of karst caves and reduce the construction cost in karst areas has always been the direction of exploration in the construction industry

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  • Karst cave foundation pit supporting construction method
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Embodiment Construction

[0029] see figure 1 As shown, the present invention relates to a construction method for karst cave foundation pit support, comprising the following steps,

[0030] (a) According to the geological survey report, establish a physical model through BIM and design construction drawings;

[0031] (b) Excavation of the foundation pit shall be excavated by sloping, and the foundation pit shall be excavated according to the construction drawings;

[0032] (c) Measure and stake out, stake out and locate at the construction site according to the construction drawings, mark the pile position, and the pile position error is less than 20mm;

[0033] (d) Bury casing 1, bury casing 1 at the pile position, the deviation between the center of casing 1 and the pile location is less than 20mm, the inclination is less than 1%, the exposed ground is 100mm-200mm, and the buried depth of casing 1 is 1.0m-1.2m ;

[0034] (e) Prepare retaining mud, build mud pools, prepare drilling mud with water,...

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Abstract

The invention relates to the field of building construction, and discloses a karst cave foundation pit supporting construction method. The karst cave foundation pit supporting construction method comprises the steps that (a) modeling through BIM and design drawing, (b) excavation of foundation pits, (c) staking out in survey, (d) embedding of a pile casing, (e) preparation of wall protection mud,(f) installation and positioning of a drilling rig, (g) drilling, (h) hole cleaning, (i) construction of a steel reinforcement cage production platform, (j) steel reinforcement cage production, (k) steel reinforcement cage lifting and (l) pouring are carried out, specifically, a geological survey report is used, the deformation of soil bodies under different working conditions is analyzed througha BIM three-dimensional solid model; a supporting pouring pile determines the communication condition of a karst cave in the form of a jump, rocks and the soil bodies in the foundation pits are takenand stirred for karst cave filling, and safety and efficiency are achieved; large karst caves are wrapped by closing nets welded to a steel reinforcement cage to reduce concrete filling and effectively reduce costs; and a mud separator is used for cleaning particles in the mud, and recycling and environment protection are achieved.

Description

technical field [0001] The invention relates to the field of building construction, in particular to a construction method for foundation pit support in a karst cave. Background technique [0002] Karst landforms are widely distributed in my country, and there are caves in the rock mass. These natural soil caves and karst caves are extremely uneven in size and distribution. In engineering construction in such areas, the foundation is very likely to encounter soil caves and karst caves. Uneven stress can easily cause foundation instability and subsidence. When the scale of the cave is large, the buried depth is shallow, and the roof of the cave cannot bear the load of the building, the roof of the cave will collapse and the foundation will become unstable, causing large economic losses. How to strengthen the foundation pit of karst caves and reduce the construction cost in karst areas has always been the direction of exploration in the construction industry. Contents of the i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/08E02D5/34E02D15/04
CPCE02D5/34E02D15/04E02D17/08
Inventor 陈守辉孙旭敏李云锋詹陈生黄铁达华瑞荣郭乾胡众
Owner GUANGDONG NO 1 CONSTRUCTION ENGINEERING CO LTD
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