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

Active Publication Date: 2009-12-09
WUHAN MUNICIPAL ENG DESIGN & RES INST
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AI-Extracted Technical Summary

Problems solved by technology

This method has a lot of construction equipment and requires a relatively open construction site. The construction is cumbersome, the construct...
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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.

Application Domain

ExcavationsBulkheads/piles

Technology Topic

Hollow coreSteel tube +2

Image

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

Examples

  • Experimental program(1)

Example Embodiment

[0034] How to implement the present invention will now be further explained in conjunction with the drawings:
[0035] Example 1 Pipeline foundation pit construction operation in old cohesive soil. The distance between the centers of the cylindrical slurry-cored piles is 500mm, the depth of the foundation pit is 6.0m, and the height of the cylindrical slurry-cored pile is 9.0m.
[0036] 1) Level the site, remove ground and underground obstacles, locate the pile hole, and place the pile machine;
[0037] 2) For the old cohesive soil, dry drilling is used to drill the hole, and the hole diameter is generally 250mm;
[0038] 3) The depth of the hole reaches the design height. If there is water in the hole, the water in the hole is drained, and the displaced soil is placed 3.0m away from the edge of the hole;
[0039] 4) Use a backhoe or a drill to put the steel pipe core material with the lower end sealing diameter generally 210mm-230mm into the borehole, and use the locator to locate;
[0040] 5) The pores between the steel pipe core material 4 and the hole wall 5 are injected with cement slurry, and the grouting is completed and solidified into a slurry forming body 6, that is, a single cylindrical slurry core pile is formed by the steel pipe hollow core material 4 and the slurry forming body 6 Pile
[0041] 6) According to the design, the soil on both sides of the foundation pit is equally spaced to form a column of cylindrical slurry-cored piles composed of the above-mentioned single cylindrical slurry-cored piles, thereby forming a strong force on the soil on both sides of the foundation pit. Pile support;
[0042] 7) Excavation of foundation pits, application of internal support, etc.;
[0043] 8) After finishing the work in the foundation pit, remove the internal support and complete the earth backfill;
[0044] 9) Pull out the pre-installed steel pipe core material in the cylindrical mortar-cored pile, and then backfill the pile hole with sand to restore the ground. Example 2 The construction operation of a hard rock and soil foundation pit, the distance between the center of the cylindrical slurry-cored piles is 500mm, the depth of the foundation pit is 6.0m, and the height of the cylindrical slurry-cored pile is 9.0m.
[0045] All construction operations and Example 1.
[0046] Example 3 The upper soil is relatively soft cohesive soil and the lower soil is hard rocky soil. The distance between the centers of the cylindrical slurry-cored piles is 400mm, the depth of the foundation pit is 5.0m, and the height of the cylindrical slurry-cored pile is 8.0m.
[0047] 1) Level the site, remove ground and underground obstacles, locate the pile hole, and place the pile machine;
[0048] 2) For the relatively soft and cohesive soil of the upper layer, use casing to protect the wall to form holes, and for the hard rock and soil of the lower layer, dry drilling is used to form holes, with the diameters of 180mm-250mm;
[0049] 3) The depth of the hole reaches the design height, the water in the hole is drained, and the displaced soil is placed 3.0m away from the edge of the hole;
[0050] 4) Use a backhoe or a drill to place the core material of the reinforced concrete pipe sealed at the lower end into the borehole, and use the locator to locate it;
[0051] 5) Cement slurry is injected into the pores between the steel pipe core material 4 and the hole wall 5, and the wall casing is taken out before the grouting is completed and solidified. After solidification, the slurry 6 and the core material 4 together form a single cylindrical slurry-cored pile;
[0052] The following construction procedures are the same as in Example 1.
[0053] Example 4 The construction of a foundation pit where the upper soil is hard rocky soil and the lower soil is relatively soft and cohesive soil.
[0054] The distance between the center of the cylindrical slurry-cored piles is 400mm, the depth of the foundation pit is 5.0m, and the height of the cylindrical slurry-cored pile is 9.0m.
[0055] 1) Level the site, remove ground and underground obstacles, locate the pile hole, and place the pile machine;
[0056] 2) For the upper hard rock and soil, dry drilling is used to form the hole, and for the lower layer, the relatively soft and cohesive soil is used to form the hole with casing wall, the diameter of which is 180mm-250mm;
[0057] The following construction procedures are the same as in Example 3.

PUM

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Description & Claims & Application Information

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