Bored pile bit overshot and method

A technology of bored piles and overshots, which is applied in earthwork drilling, wellbore/well components, etc., which can solve problems such as easy scratches on the retaining wall, drill pipe breakage, and accidents in the hole, so as to shorten the processing time of drill drop and avoid The effect of damage and sticking, easy mass production

Active Publication Date: 2017-10-03
CHINA GEZHOUBA (GRP) FIRST ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the processing time is long, and the hook is mainly used to hook the drill belt or support plate. The drill bit is easy to eccentrically tilt, easy to scratch the wall or get stuck in the hole; 2. Use the impact drill to break the drill into small pieces, and use the magnet Iron slag sucked out of the pile
The disadvantage is that the processing time is long, and it is easy to be eccentric during the impact process, and even cause more serious accidents in the hole
[0004] Whether it is a positive circulation drilling rig or a reverse circulation drilling rig, the drill drop and broken rod often appear at the joint between the drill bit and the drill pipe. The flange connection bolts are loose and broken, the screw thread is broken, and the drill pipe at the end of the drill bit is broken. Drill pipe drive system failure

Method used

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  • Bored pile bit overshot and method
  • Bored pile bit overshot and method
  • Bored pile bit overshot and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A kind of bored pile drill bit fisher, the end of connecting rod 4 is provided with helical guide device 1, and the length of connecting rod 4 is 60cm in this example, adopts the common drill pipe of circulating drilling rig to process and manufacture, and one end is provided with flange, through connecting The bolt is connected with the drill pipe 4 of the drilling rig. The other end is welded into a whole through a flange or a plate-like structure similar to a flange and a reinforcing rib 3 . The said helical guiding device 1 at least comprises an annular segment 101 , and a helical segment 102 is arranged at the end of the annular segment 101 . The screw guide adopts Q 235 The steel plate is cut and cold-bent.

[0033] At the end of the helical section 102 there is an outwardly stretched section 103 . Used for searching and touching broken drill bit or drill pipe.

[0034] The two ends of the connecting rod 4 are provided with a flange 5, the edge of the flange 5...

Embodiment 2

[0040] The pile foundation with a pile diameter of 1.5m jumps due to the exposure of large-sized floating pebbles during the drilling process, and the construction personnel neglected to install less connecting bolts, resulting in a sudden drill drop accident during the drilling process. Take this as an example Explain that the bored pile bit overshot is used to fish for the dropped drill bit.

[0041] In this example, the flange bolts at the connection position between the drill pipe and the drill bit were broken, the transmission failed, and the drill bit fell into the pile well.

[0042] Pull out the drill pipe in time after a drill drop accident, understand the detailed depth and location of the drill pipe fracture, analyze the cause of the drill drop, and formulate a drill bit salvage plan.

[0043] A method for salvaging a drill bit in a bored pile by using the above-mentioned drill bit catcher, comprising the following steps:

[0044] 1. Connect the connecting rod 4 wi...

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PUM

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Abstract

A drill bit fisher for bored piles is provided with a helical guiding device at the end of a connecting rod, the said helical guiding device at least includes a ring section, and a helical section is provided at the end of the ring section. The end of the helical section is provided with an outward stretching section. A method for salvaging a drill bit in a bored pile, comprising the steps of: connecting a connecting rod with a drill rod, and a screw guiding device is located at the lower end of the connecting rod; lowering the drill rod joint by joint, and rotating the drill rod so that the top flange of the drill bit falls Use the drilling rig to slowly lift the helical guide and the drill bit; disassemble the drill pipe section by section until the drill bit is salvaged out of the hole; through the above steps, the drill bit of the bored pile can be salvaged. The invention can realize fast and effective salvage of the dropped drill bit, uses the spiral guide device to realize the search and contact detection of the drill bit, thus quickly finds the drill bit, and then uses the annular section and the connecting plate to lock the drill bit to realize salvage.

Description

technical field [0001] The invention relates to the field of bored cast-in-place pile foundation construction in bridge engineering and construction engineering, in particular to a bored pile drill bit catcher and method suitable for drilling bored pile construction by circulating drilling rigs and dealing with accidents of drill drop and rod breakage in holes . Background technique [0002] At present, bored piles are widely used in highway municipal engineering and housing construction projects. Drilling equipment is mainly circular drilling rigs and rotary drilling rigs. Mud wall protection measures are used to ensure the quality of holes. Affected by changes in geological conditions, poor flange connection quality, unstable drilling rig, bit swing, and negligence in human operation, etc., accidents such as drill drop and broken rod in the hole often occur, and fast and effective methods must be adopted in time for salvage and treatment, especially Under the geological c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B31/08
Inventor 肖振张璟鑫郑自才程潇雨李浩杰高航杜浩孟帅
Owner CHINA GEZHOUBA (GRP) FIRST ENG CO LTD
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