Karst geology rotary-drilling bored concrete pile hole forming process

A cast-in-place pile and geology technology, applied in sheet pile walls, infrastructure engineering, construction, etc., can solve problems such as drill bit falling, stuck drilling, drilling deflection, etc., to avoid drill bit falling, improve pile forming efficiency, Avoid the effect of sticking

Active Publication Date: 2014-11-19
GUANGXI UNIVERSITY OF TECHNOLOGY
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  • Abstract
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Problems solved by technology

The existing construction technology is aimed at the general geological conditions. If the general geological rotary drilling pile construction technology is copied in the karst area with complex geological conditions, different problems will arise. The most important problem is the deviation of the borehole. , Drill sticking, drill bit drop, incomplete hole cleaning, broken piles and waste piles, etc.
Due to the poor stability of the drilling rig installation, the unstable installation of the drilling rig or the bending of the drill pipe during operation, the soft ground or uneven hardness and other reas

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  • Karst geology rotary-drilling bored concrete pile hole forming process
  • Karst geology rotary-drilling bored concrete pile hole forming process
  • Karst geology rotary-drilling bored concrete pile hole forming process

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Embodiment Construction

[0022] The technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] refer to figure 1 , the technical solution adopted by the present invention to solve its technical problems is: the construction process of the improved rotary-dug hole-forming cast-in-place pile in the karst area is: leveling the site→pile position setting-out→rotary drilling rig in place→burying casing→casing Supplement internal stabilization fluid → rotary digging to form a hole (slow down the drilling speed when encountering a karst cave, and drill to the design elevation when not encountering a karst cave) → clean the hole and check the depth of the hole → install steel cages and conduits → gas lift reverse circulation 2 Secondary hole cleaning → pouring underwater concrete (considering the existence of karst caves, it is necessary to prepare 30 to 40 cubic meters of concrete to prevent the break...

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Abstract

The invention discloses a karst geology rotary-drilling bored concrete pile hole forming process which includes the steps of 1, leveling a field; 2, paying off at a pile foundation; 3, setting a rotary drilling machine in place; 4, embedding a pile casing; 5, preparing mud stabilizing liquid and filling the mud stabilizing liquid into the pile casing; 6, forming holes by means of rotary drilling (with requirements of reducing drilling speed when drilling in karst caves or half rocks, otherwise, drilling to reach designed elevation ); 7, performing primary cleaning of holes and hole depth checking; 8, mounting a reinforced cage and a conduit; 9, performing secondary cleaning through air-lift reverse circulation; 10, pouring underwater concrete (while preparing extra 30-40 cubic meters of concrete with consideration of karst caves so as to prevent pile scrap caused by breakdown of the karst caves and sharp sinking of concrete); and 11, forming a pile and removing the pile casing.

Description

technical field [0001] The invention relates to a pile foundation construction technology, in particular to a karst geological rotary-dug cast-in-place pile hole-forming technology. Background technique [0002] The construction technology of rotary drilling bored pile is a pile foundation construction technology that has emerged in recent years. At present, the existing construction technology of rotary drilling bored piles is: leveling the site → laying out the pile position → placing the rotary drilling rig in place → laying the casing → supplementing the stabilizing fluid in the casing → rotary digging to form a hole → clearing the hole and inspecting the hole Deep → install reinforcement cages and conduits → secondary hole cleaning → pouring underwater concrete → forming piles and pulling out the casing. The existing construction process quality control standards and construction process technical standards have no specific national construction method standards. The ...

Claims

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Application Information

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IPC IPC(8): E02D5/36
Inventor 王家全黄柳云朱庆盛吴辉琴黄世斌
Owner GUANGXI UNIVERSITY OF TECHNOLOGY
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