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Hole-forming construction method for cast-in-situ bored pile in hard rock stratum

A technology of bored piles and formations, which is applied in the direction of drilling equipment and methods, drilling tools, sheet pile walls, etc., and can solve the problem of slow hole-forming speed of manual-dug piles, many restricted conditions of manual-dug holes, and inability to produce large piles. Large vibration and other problems, to achieve the effect of small vibration, fast construction progress, and less wear of the gear teeth

Pending Publication Date: 2022-01-28
CHINA HYDROPOWER ELEVENTH ENG BUREAU ZHENGZHOU CO LTD +1
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Problems solved by technology

[0003] Disadvantages: Manual digging is subject to many restrictions. The most important thing is that in an anhydrous environment, the groundwater level is high, which is not suitable, and the speed of manual digging piles is slow and the efficiency is low.
Percussion drilling is a commonly used hole-forming method in hard rock geological conditions. The hammer head is selected according to the strength of the rock formation. However, in the environment close to buildings, large vibrations cannot be generated, which limits the use of this method.

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  • Hole-forming construction method for cast-in-situ bored pile in hard rock stratum
  • Hole-forming construction method for cast-in-situ bored pile in hard rock stratum
  • Hole-forming construction method for cast-in-situ bored pile in hard rock stratum

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Embodiment Construction

[0039] The present invention is described in further detail below by embodiment, and embodiment is only used for illustrating the present invention, does not limit the scope of the present invention.

[0040] G526 National Highway Daishan Section Reconstruction Project Control Project - Xinjiangnan Bridge, the main bridge is equipped with two dumbbell-shaped caps, and the foundation of the caps uses 18 bored piles with a diameter of 1.8m, all of which are rock-socketed piles. The 7 pile foundations of the large pile caps are located behind the abutment of the old bridge, with a difference of 2.47m in the longitudinal bridge direction and a 1.9-2.5m overlap in the transverse bridge direction. The old Jiangnan Bridge is a thrust arch bridge. The bridge cannot generate disturbances. Affected by this, the drilling process of the 7 pile foundations of the new bridge requires the use of a rotary drilling rig with drill bits of different diameters to form holes in stages to reduce di...

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Abstract

The invention relates to the field of pile foundation drilling construction under the geological condition of a hard rock stratum and particularly relates to a hole-forming construction method for a cast-in-situ bored pile in the hard rock stratum. The method comprises the following steps of punching a pilot hole; configuring a drilling machine and a drill bit; drilling with a small diameter of phi 1.2 m; and full-diameter drilling of phi 1.8 m being carried out. According to the method, a rotary drilling rig is matched with drill bits with different diameters to form holes in a grading mode, drilling efficiency can be effectively improved, and the method has important significance on construction of pile foundation engineering under the hard rock and vibration control environment.

Description

technical field [0001] The invention relates to the field of pile foundation drilling construction under relatively hard rock geological conditions, in particular to a hole-forming construction method for bored cast-in-place piles in hard rock formations. Background technique [0002] Under the hard geological conditions of the rock stratum, especially in the construction environment close to the building, the pile foundation drilling is mostly made by manual digging or percussion drilling. [0003] Disadvantages: There are many restrictions on manual digging. The most important thing is that in an anhydrous environment, the groundwater level is high, which is not suitable, and the speed of manual digging piles is slow and the efficiency is low. Percussion drilling is a commonly used hole-forming method in hard rock geological conditions. The hammer head is selected according to the strength of the rock formation. However, in the environment close to buildings, large vibrati...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/02E21B7/04E21B12/00E21B27/00E21B47/00E02D5/34
CPCE21B7/02E21B7/04E21B12/00E21B27/00E21B47/00E02D5/34
Inventor 詹书瑞田卓伦彭杰刘剑勇楚晋阳张金玉别晓松秦鹏举
Owner CHINA HYDROPOWER ELEVENTH ENG BUREAU ZHENGZHOU CO LTD
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