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Large-diameter cast-in-place pile hard rock rotary excavating guide grading reaming construction method

A construction method and cast-in-situ pile technology, applied in chemical instruments and methods, sheet pile walls, directional drilling, etc., can solve problems such as low drilling efficiency, drilling deviation, and enlarged drilling deviation, and achieve significant comprehensive economic benefits , shorten the construction period, and avoid the effect of mechanical use

Pending Publication Date: 2022-06-07
SHENZHEN GONGKAN GEOTECHN GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when there is an inclined rock surface in the hard rock formation or there are cracks and broken zones in the integrity of the rock mass, during the process of drilling into the rock with graded reaming, the small-diameter drill bit has no lateral support in the hole, and it is very easy to produce cracks during drilling. Deviation, drilling deviation is difficult and time-consuming, resulting in low drilling efficiency, increased construction costs, and difficulty in ensuring pile hole quality
[0003] It is currently found that when the bearing layer at the pile end is medium-to-slightly weathered granite, the moderately weathered rock has developed cracks, and the rock mass is relatively broken. During the drilling process, due to the development of cracks in the moderately weathered rock formation, rock mass fragmentation, and uneven strength, when the drill bit with a diameter of 1600mm is used to drill into the rock, since the drill bit is lowered into the hole with a diameter of 2400mm, there is no lateral constraint on the drill tool. Under the influence of the broken rock surface and the vibration when drilling into the rock, the drilling hole is seriously deflected. In the next stage of reaming, the thickness of the rock wall is uneven due to the partial hole in the previous stage, so that the drilling depth is further enlarged. The deviation of the hole caused the verticality of the pile hole in the rock entry section to exceed the standard, which could not meet the quality requirements of the pile hole

Method used

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  • Large-diameter cast-in-place pile hard rock rotary excavating guide grading reaming construction method
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  • Large-diameter cast-in-place pile hard rock rotary excavating guide grading reaming construction method

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Embodiment 1

[0049] A large-diameter cast-in-place hard rock rotary digging guide drill bit includes an upper centralizing drill bit 1 and a lower centralizing drill bit 2. The upper centralizing drill bit 1 includes an upper centralizing guide section 11 and a rotary drilling barrel arranged below the upper centralizing guide section 11. 12. The upper centralizing guide section 11 is connected to the rotary drilling barrel 12 through the drill rod 13, and the bottom of the rotary drilling barrel 12 is provided with cutting teeth 14; specifically, the upper centralizing guiding section 11 is positioned in a short cylindrical shape Guiding device; the diameter of the upper centralizing guide section 11 is larger than the diameter of the rotary drilling barrel 12;

[0050] The lower centralizing bit 2 includes a roller cone drill pipe 22 and a lower centralizing guide section 21 arranged below the roller cone drill pipe 22. The righting guide section 21 is a drill tube with pick teeth 23, an...

Embodiment 2

[0060] A construction method for large-diameter cast-in-situ pile hard rock rotary excavation guided graded hole expansion, comprising the following steps

[0061] S1. Pile position measurement and stakeout

[0062] 1) Use excavators to level and compact the construction site before construction;

[0063] 2) The surveying engineer shall stake out the site according to the layout plan of the pile position, and mark the position of the pile on the ground with wooden piles or welding rods;

[0064] 3) The constructor stretches the cross line according to the staked pile position, and places 4 control piles at the end of the line as the positioning reference point of the outer casing.

[0065] S2, BG46 high torque rotary drilling rig in place

[0066] 1) Since the maximum design diameter of the cast-in-place pile in this project is Φ2400mm, it is necessary to configure a high-torque rotary drilling rig for secondary reaming for soil layer drilling construction. The power is 570...

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Abstract

The invention discloses a large-diameter cast-in-place pile hard rock rotary excavating guide grading reaming construction method. The method comprises the following steps that S1, a hole opening pile casing is buried; s2, the soil layer sections are drilled to the rock surface in a grading mode; s3, an upper righting drill bit drills a pilot hole; s4, drilling to the designed pile bottom elevation along the pilot hole; s5, a lower centralizing drill bit is used for hard rock chambering drilling; and S6, checking and accepting the final hole of the pile hole. According to the construction method, the upper righting guide section and the lower righting guide section are combined on the drill bit, so that the drilling perpendicularity is effectively guaranteed, and the effects of high hard rock drilling efficiency and good hole forming quality are achieved.

Description

technical field [0001] The invention relates to the technical field of a graded hole reaming construction method, in particular to a large-diameter cast-in-place pile hard rock rotary excavation guide graded hole reaming construction method. Background technique [0002] When drilling large-diameter cast-in-place piles when encountering medium and slightly weathered hard rock bearing layers, a graded reaming drilling process is usually used, that is, a small-diameter rotary drilling bit is used to drill from the center of the pile to the design elevation of the pile bottom. Increase the diameter of the borehole step by step until the drilling reaches the design pile diameter. This graded hole reaming process maximizes the transmission of the power and torque of the rotary drilling rig to the rotary drilling bit, enabling fast drilling of hard rock, and has been widely used in rotary hard rock drilling. However, when there is an inclined rock face in the hard rock formation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/26E21B10/08E21B7/04E21B17/10E02D5/34C09K8/20
CPCE21B10/26E21B10/08E21B7/04E21B17/1078E02D5/34C09K8/20
Inventor 刘彪雷斌朱陶园林桂森孔德健王涛韩凯高世泉
Owner SHENZHEN GONGKAN GEOTECHN GRP