Construction method of cast-in-situ bored pile suitable for karst cave geology

A technology of impact hole forming and construction method, which is applied in the direction of sheet pile walls, foundation structure engineering, construction, etc., and can solve problems that affect the safety of houses and personal property, the quality of pile foundations cannot be guaranteed, and the quality of pile foundations is endangered. Achieve the effects of avoiding later reinforcement or layer reduction events, improving pile-forming efficiency, and reducing the use of mud

Active Publication Date: 2015-08-05
ZHEJIANG DAHUA CONSTR GROUP
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  • Summary
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  • Description
  • Claims
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Problems solved by technology

For general karst cave geology, the method of filling karst caves and drilling retaining walls can usually achieve the effect of pile formation, but the quality of pile foundations cannot be guaranteed. Defects such as partial hole of sliding rod, falling rod

Method used

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  • Construction method of cast-in-situ bored pile suitable for karst cave geology
  • Construction method of cast-in-situ bored pile suitable for karst cave geology
  • Construction method of cast-in-situ bored pile suitable for karst cave geology

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Embodiment Construction

[0020] See attached picture. Present embodiment is example with design pile diameter 600mm, effective pile length 20m; It comprises the following steps:

[0021] 1) Pile position measurement and positioning; before determining the pile position, first re-calibrate the building base point, close the measurement, find out the relationship between the base point and the wire point, and then measure the pile position after meeting the error tolerance requirements; measure the pile position three times To carry out, measure once before digging and burying the casing, and re-measure once after burying the casing, so that the deviation between the center of the casing and the center of the pile site is not more than 50mm, and insert a long steel bar in the center of the pile location as a pile location mark; then use Use the level instrument to measure the floor elevation of the casing mouth, and make measurement records; the third measurement is to be carried out after the drilling ...

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Abstract

The invention discloses a construction method of a cast-in-situ bored pile suitable for the karst cave geology. The construction method comprises the following steps that (1), a pile position is measured and positioned; (2), a casing is embedded; (3), a pile machine is in position; (4), rock blocks and yellow mud are backfilled, a hole is bored; (5) first-time hole cleaning is carried out; (6), a steel sleeve and a steel reinforcement cage are machined and fixed; (7), the steel sleeve and the steel reinforcement cage are put into the hole; (8), a guide pipe is arranged, and second-time hole cleaning is carried out; (9), concrete is poured; and (10), shifting is carried out. Compared with a conventional construction method, pile body segregation, foot rotting, pile breaking defects and the like are effectively solved, and pile waste can be prevented; the quality of a pile foundation is obviously improved, and safety of a foundation structure of a house is ensured; and later reinforcing or layer reduction event caused by insufficient bearing capacity of a foundation is avoided.

Description

technical field [0001] The invention belongs to the technical field of building construction, and in particular relates to a construction method of impact hole-forming cast-in-place piles suitable for karst cave geology. Background technique [0002] Karst cave geology is distributed in many areas of my country. Due to the influence of the mechanical properties of rock formations, karst caves are often accompanied by unfavorable geological conditions for engineering construction such as groundwater, underground rivers, and karst ditches. For general karst cave geology, the method of filling karst caves and drilling retaining walls can usually achieve the effect of pile formation, but the quality of pile foundations cannot be guaranteed. Defects such as partial holes of sliding rods, falling rods and casings, difficulties in retaining walls, perforation and slurry leakage will directly lead to pile foundation quality hazards such as broken piles, rotten feet, and pile sinking...

Claims

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Application Information

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IPC IPC(8): E02D5/38
Inventor 徐钢陈小华张春跃马春雷庄小平敖海军鲁寅
Owner ZHEJIANG DAHUA CONSTR GROUP
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