Device and method for fishing drill dregs

An overshot and slag drilling technology, which is used in earth-moving drilling, wellbore/well components, etc., to achieve the effect of ensuring rapid hole formation, reducing wear and reducing the risk of in-hole accidents

Inactive Publication Date: 2015-08-12
CHINA GEZHOUBA (GRP) FIRST ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a drilling slag fisher and a drilling slag fishing method, which can effectively solve the problem of slag removal and fishing when the circulating drilling machine encounters large-size drilling slag, and greatly improve the hole-forming speed and quality of the pile foundation

Method used

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  • Device and method for fishing drill dregs
  • Device and method for fishing drill dregs
  • Device and method for fishing drill dregs

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Experimental program
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Effect test

Embodiment 1

[0029] like Figure 1~4 Among them, a drilling slag fisher, the fisher 1 includes a cylinder 5, and the cylinder 5 adopts Q 235 The steel plate is rolled and welded, the thickness of the steel plate is 2.5cm, the diameter is 3 / 4 of the pile diameter, the height of the cylinder 5 is 1.2m, and the cylinder 5 is mainly the storage space for drilling slag salvage. The lower end of the cylinder body 5 is open, and a conical cap 8 is arranged at the upper end of the cylinder body 5, and the conical cap adopts Q 235 The steel plate is cut, rolled and welded, the conical cap and the cylinder 5 are welded into a whole, the top of the conical cap 8 is connected with the connecting rod 3 of Zhongtong, the connecting rod 3 is made of a short drill pipe, and the diameter of the cylinder 5 is greater than the diameter of the connecting rod 3. A support wire 7 is provided at a position close to the bottom of the cylinder body 5 . The support wire 7 is a steel strand.

[0030] In a prefer...

Embodiment 2

[0036] On the basis of embodiment 1, a kind of drilling slag dredging method adopting above-mentioned drilling slag dredge comprises the following steps:

[0037] 1. Stop drilling after encountering large-size drilling slag. When drilling difficulties, drill pipe jumping, slurry temperature rise and other phenomena occur during drilling, it indicates that the pile has entered the large-sized boulder and floating gravel layer. At this time, stop drilling and pull out the drill pipe.

[0038] 2. Replace the overshot. After the drill pipe is pulled up, the drill bit is replaced with the slag catcher of the present invention, and then the hole is drilled again until the top of the large-diameter slag;

[0039] Three, rotary cutting extrusion slag removal. After the overshot touches the large-sized drilling slag, the drill pipe will not continue to sink. At this time, the low-speed, slow-rotation and slow-pressure operation mode is adopted, for example, the speed is lower than 20...

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Abstract

The invention provides a device for fishing drill dregs. The device comprises a barrel; the upper end of the barrel is provided with a conical cap, while the lower end is open; the top end of the conical cap is connected with a through connecting rod; a supporting wire rod is arranged at a position, close to the bottom, in the barrel; the supporting wire rod is a steel stranded wire; the supporting wire rod is arranged into a plurality of layers in a radial shape along the circumference; two ends of the steel stranded wire are provided with extrusion anchors which are connected with the inner wall of the barrel. A method for fishing drill dregs comprises the following steps: stopping drilling and pulling up a drill pipe when meeting large-grain-size drill dregs; taking down a drill bit and replacing the drill bit with the device for fishing the drill dregs; slowly circling and pressing in a pile well by the device, and enabling the large-grain-size drill dregs to pass through the supporting wire rod to be clamped in the barrel of the device; lifting the device to the outside of the pile well for discharge; the aim of fishing the large-grain-size drill dregs is fulfilled by the steps. By adopting the device and the method, disclosed by the invention, boulder and large-grain-size drift cobble and gravel stratums in a bore of a bored pile are effectively fished out, the abrasion of the drill bit is reduced, and the drilling speed and quality are greatly improved.

Description

technical field [0001] The invention relates to the construction field of bored pile foundations in bridge engineering and construction engineering, in particular to deal with and deal with the change of geological conditions in the hole, and the drilling slag with large particle diameters such as large boulders with a particle size of 5 cm to 35 cm and boulders with a particle size of 5 cm to 35 cm. overshot. Background technique [0002] During the construction of bored piles in bridge engineering and housing construction, due to the limitations of geological exploration scope, exploration depth and exploration machinery, it is impossible to fully and accurately determine the detailed geological conditions of the project location, such as the floating gravel layer in the alluvial plain area, The collapsing sediment deposits on the bank of the canyon, etc., these special geological layers have added great difficulty to the pile foundation construction. [0003] When there ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B27/00
CPCE21B27/00
Inventor 肖振张璟鑫程潇雨李浩杰高航宣凤刚汪丽峡张利辉崔帅
Owner CHINA GEZHOUBA (GRP) FIRST ENG CO LTD
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