Construction method of cylindrical slurry core pile for retaining and protecting foundation pit

A technology of foundation pit support and construction method, which is applied in basic structure engineering, excavation, sheet pile wall and other directions, can solve the problems of long construction period, many construction equipment, and high engineering cost, and achieves less construction equipment, fewer operators, The effect of low engineering cost

CN101597903AActive Publication Date: 2009-12-09WUHAN MUNICIPAL ENG DESIGN & RES INST
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2009-12-09

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Abstract

The invention relates to a method of a cylindrical slurry core pile for retaining and protecting a foundation pit, belonging to a foundation pit construction method and the field of machines in municipal engineering. In the method, before dredging the foundation pit, cylindrical slurry core piles which are formed by field slurry molding bodies which are connected by center pre-setting hollow core materials and outer walls are arranged along the two wall bodies of the foundation pit at interval, that is, the core materials are pre-arranged and located in a pile hole which is drilled mechanically through the location of the pile hole, the hole between the core materials and the pile hole is injected with colloidal slurry, after the slurry is coagulated, the slurry and the core materials form single cylindrical slurry core pile; according to the design, after retaining and protecting the rows of the slurry core piles at the two sides of the wall body of the foundation pit, the foundation pit is dredged, the earth is backfilled after carrying out the construction, the pre-setting core materials are pulled out from the pile, and the pile hole is backfilled with sandy soil; the method is a simple retaining and protecting method of hollow cylindrical piles aiming at the earth with good quality, the mechanical hole-forming is adopted, the occupying area is small without big dredging construction, the environment is beneficial to being protected, the core materials of steel tubes can be used repeatedly, the resource is saved, and the method has wide application range.
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Description

technical field

[0001] The invention relates to a construction method of a cylindrical slurry core pile for foundation pit support, which belongs to the foundation pit support construction technology in the fields of municipal engineering and construction engineering. Background technique

[0002] At present, in the foundation pit construction of municipal engineering and construction engineering, for pipelines and box culvert foundation pits, different support methods are usually selected according to the surrounding environment and engineering geological conditions of the foundation pit. When the surrounding environment is open and the engineering geological conditions are good, the large excavation method has been adopted for a long time. However, in order to protect the environment, protect and rationally develop and effectively utilize valuable land resources, in urban construction regulations, large excavation methods are not allowed for the construction of many pipeli...

Examples

Embodiment Construction

[0034] Now further illustrate how the present invention is implemented in conjunction with accompanying drawings:

[0035] Example 1 For the construction of the foundation pit of an old cohesive soil pipeline, the distance between the centers of the cylinder slurry core piles is 500mm, the depth of the foundation pit is 6.0m, and the height of the cylinder slurry core piles is 9.0m.

[0036] 1) Level the site, remove ground and underground obstacles, locate pile holes, and place pile drivers;

[0037] 2) For old cohesive soil, dry drilling is used to drill holes, and the hole diameter is generally 250mm;

[0038] 3) When the hole depth reaches the design height, if there is water in the hole, drain the water in the hole, and place the displaced soil 3.0m away from the edge of the hole;

[0039] 4) Use a backhoe or a drilling rig to put the steel pipe core material with a lower end sealing diameter of 210mm-230mm into the drill hole, and use a locator to locate it;

[0040] 5...