CN115012867A - Wellhead blowout prevention, noise reduction, dust removal and sampling device applied to air drilling - Google Patents
Wellhead blowout prevention, noise reduction, dust removal and sampling device applied to air drilling Download PDFInfo
- Publication number
- CN115012867A CN115012867A CN202210795862.2A CN202210795862A CN115012867A CN 115012867 A CN115012867 A CN 115012867A CN 202210795862 A CN202210795862 A CN 202210795862A CN 115012867 A CN115012867 A CN 115012867A
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- Prior art keywords
- pipe
- flange
- drilling
- dust fall
- sampling device
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000428 dust Substances 0.000 title claims abstract description 61
- 238000005553 drilling Methods 0.000 title claims abstract description 34
- 230000002265 prevention Effects 0.000 title claims abstract description 18
- 238000005070 sampling Methods 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 210000004907 gland Anatomy 0.000 claims description 25
- 238000007789 sealing Methods 0.000 claims description 14
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 11
- 229910052802 copper Inorganic materials 0.000 claims description 11
- 239000010949 copper Substances 0.000 claims description 11
- 238000004026 adhesive bonding Methods 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 3
- 239000002699 waste material Substances 0.000 abstract description 14
- 239000002912 waste gas Substances 0.000 abstract description 11
- 239000011435 rock Substances 0.000 abstract description 10
- 238000010276 construction Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 6
- 239000000843 powder Substances 0.000 abstract description 6
- 230000002411 adverse Effects 0.000 abstract description 3
- 238000005507 spraying Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 238000012856 packing Methods 0.000 description 3
- 238000003915 air pollution Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/06—Blow-out preventers, i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/01—Arrangements for handling drilling fluids or cuttings outside the borehole, e.g. mud boxes
- E21B21/011—Dust eliminating or dust removing while drilling
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/06—Down-hole impacting means, e.g. hammers
- E21B4/14—Fluid operated hammers
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/02—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells by mechanically taking samples of the soil
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Soil Sciences (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a wellhead blowout prevention, noise reduction, dust removal and sampling device applied to air drilling, and mainly relates to the technical field of air down-the-hole hammer positive circulation drilling. The waste residue and the waste gas are guided, so that adverse effects of severe construction environment caused by the fact that the waste residue and the waste gas impact the drilling platform from the front side are prevented; the method is beneficial to improving the construction environment, preventing the potential safety hazard caused by directly spraying rock powder and underground water to the operating room and the workbench of the drilling platform, facilitating the rapid discharge of the rock powder in the well hole to the ground, reducing the repeated drilling and improving the drilling speed.
Description
Technical Field
The invention relates to the technical field of positive circulation drilling of an air down-the-hole hammer, in particular to a wellhead blowout prevention, noise reduction, dust removal and sampling device applied to air drilling.
Background
In the air down-the-hole hammer positive circulation drilling construction, high-pressure compressed air flow carries rock debris to be sprayed out from the bottom of a drill hole to a wellhead and scattered around a drill site, so that the environment is polluted, the construction is not facilitated, and the flow guide control of the sprayed material is required.
The existing wellhead device is characterized in that a disc is arranged at the top of a drilling meter sleeve, a short pipe with the length of 500mm is prepared, a hollow rubber plug is arranged in the short pipe, two ends of the short pipe are connected by flanges, and the rubber plug can directionally guide airflow outside a jet hole to play a role in guiding the flow; in addition, the airflow carries rock debris to be directly sprayed out from the drainage outlet, a dust fall system is lacked, the rock debris floats to zero, the rock debris cannot be collected, and the requirement of collecting samples cannot be met.
Disclosure of Invention
The invention provides a wellhead blowout prevention, noise reduction, dust removal and sampling device applied to air drilling, and solves the technical problems in the background technology.
The technical scheme adopted by the invention for solving the technical problems is as follows: including preventing spouting unit and dust fall unit, prevent spouting the unit and include base, three-way seat and bearing frame, base, three-way seat and bearing frame coaxial line can dismantle the connection from upwards following in proper order, and the base setting is in the top of well head, and the pipeline of base lower extreme and well head can be dismantled and be connected, the external drilling rod in bearing frame upper end, the dust fall unit includes dust fall pipe and spout device, and the dust fall pipe is horizontal, and the one end of three-way seat and dust fall pipe can be dismantled the connection, and the spout device sets up the other end at the dust fall pipe.
Preferably, the base is of a structure with an upper opening and a lower opening, the lower end of the base is connected with a pipeline of a wellhead in a plug-in mounting mode, and the upper end of the base is provided with a third flange.
Preferably, the tee bend seat is three way connection style structure, and the tee bend seat includes the mouth of pipe, down mouth of pipe and side mouth of pipe, and the top mouth of pipe is provided with flange four, and can dismantle the connection through flange four and bearing frame, and the mouth of pipe is provided with flange five down, and can dismantle the connection through flange five and flange three, and the side mouth of pipe is provided with flange one, and can dismantle the connection through the one end of flange one and dust fall pipe.
Preferably, the bearing frame includes the sealed core of gluing, go up the gland, lower gland, the sleeve, connection pad and polydisc bearing, the sleeve suit is in the bearing frame, polydisc bearing all arranges the suit from top to bottom outside the sleeve, the connection pad upper end can be dismantled and connect at the sleeve lower extreme, open about the connection pad, connection pad lower extreme and sealed core of gluing can dismantle the connection, sealed downthehole hole that link up from top to bottom that is provided with of gluing, the upper end toper shrink in hole, the size and the drilling rod cooperation in hole, go up the gland and all the suit of gland down outside the sleeve, and be used for the pressure equipment respectively at the upside and the downside of polydisc bearing, it all can dismantle with the bearing frame and be connected to go up the gland and the gland down.
Preferably, the dust fall pipe adopts seamless pipe, and the one end welding of dust fall pipe has flange two, and flange two and flange one can be dismantled the connection, and the spout device includes a plurality of nozzles and a plurality of copper pipe, and a plurality of nozzle interval evenly distributed are at the other end of dust fall pipe, and a plurality of copper pipe one end pierces through the dust fall pipe respectively and corresponds and a plurality of nozzle connection, and a plurality of copper pipe other ends communicate each other and external pressure water source, and the nozzle adopts vaporific shower nozzle.
Preferably, the upper gland and the lower gland are sleeved with sealing rings at positions contacting with the sleeve, and the sealing rings are rotary shaft lip-shaped sealing rings.
Preferably, a spring gasket and a plurality of flat gaskets are arranged at the joint of the upper end of the bearing seat and the drill rod.
Preferably, the bearing is a deep groove ball bearing.
The invention adopts the structure and has the following advantages:
1. the problem that a common drill rod cannot be used in a vehicle-mounted drilling machine is solved, waste residues and waste gas are guided, and adverse effects of severe construction environments caused by the fact that the drilling platform is impacted by the front surfaces of the waste residues and the waste gas are prevented;
2. the construction environment is favorably improved, the potential safety hazard caused by directly spraying rock powder and underground water to an operating room and a workbench of a drilling platform is prevented, the rock powder in the well hole is favorably and quickly discharged to the ground, the repeated drilling is reduced, and the drilling speed is increased;
3. the water is atomized by the nozzle and then sprayed to the waste slag and waste gas which are guided out, so that the dust falling effect is effectively realized, the air pollution is basically avoided, and the green reconnaissance is realized;
4. the waste residue is concentrated and falls near the other end port of the dust fall pipe after being guided out, and no scattered floating is generated, so that the waste residue is convenient to collect and sample.
Drawings
FIG. 1 is a schematic front view of the present invention;
FIG. 2 is a front view cut-away schematic structural view of the blowout prevention unit;
FIG. 3 is a front view sectional structure diagram of the dust settling unit;
fig. 4 is a left side view configuration diagram of the dust fall unit.
In the figure, 1, a blowout prevention unit; 2. a dust falling unit; 11. a flat gasket; 12. a spring washer; 13. a bearing seat; 14. a bearing; 15. a seal ring; 16. sealing the rubber core; 17. a three-way seat; 18. a base; 19. a gland is arranged; 110. a sleeve; 111. a lower gland; 112. a connecting disc; 113. a first flange; 21. a mist spray head; 22. a copper pipe; 23. a dust settling pipe; 24. and a second flange.
Detailed Description
In order to clearly explain the technical features of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings.
Example one
As shown in fig. 1, the whole body comprises a blowout prevention unit 1 and a dust fall unit 2, the blowout prevention unit 1 comprises a base 18, a three-way seat 17 and a bearing seat 13, the base 18, the three-way seat 17 and the bearing seat 13 are coaxially connected with each other sequentially from bottom to top through bolts and nuts, the base 18 is installed above a wellhead, external threads are machined at the lower end of the base 18, the base 18 is in threaded connection with a pipeline of the wellhead, a drill rod is externally connected to the upper end of the bearing seat 13, the dust fall unit 2 comprises a dust fall pipe 23 and a nozzle device, the dust fall pipe 23 is transversely arranged and 4 m in length, one end of the three-way seat 17 and one end of the dust fall pipe 23 are connected through the bolts and the nuts, and the nozzle device is installed at the other end of the dust fall pipe 23;
as shown in fig. 2, the base 18 is of a structure with an upper opening and a lower opening, the lower end of the base 18 is connected with a pipeline of a wellhead in a plug-in manner, and the upper end of the base 18 is welded with a third flange;
as shown in fig. 2, the tee joint 17 is a tee joint type structure, the tee joint 17 includes an upper pipe orifice, a lower pipe orifice and a side pipe orifice, the upper pipe orifice is welded with a flange four and is connected with the bearing block 13 through the flange four and a bolt and a nut, the lower pipe orifice is welded with a flange five and is connected with the flange three through the flange five and the bolt and the nut, the side pipe orifice is welded with a flange one 113 and is detachably connected with one end of the dust settling pipe 23 through the flange one 113;
as shown in fig. 2, the bearing seat 13 includes a packing rubber core 16, an upper gland 19, a lower gland 111, a sleeve 110, a connecting disc 112 and a multi-disc bearing 14, the sleeve 110 is sleeved in the bearing seat 13, the multi-disc bearings 14 are all vertically arranged and sleeved outside the sleeve 110, the bearing 14 is a deep groove ball bearing 14, the upper end of the connecting disc 112 is detachably connected to the lower end of the sleeve 110, the connecting disc 112 is vertically open, the lower end of the connecting disc 112 is detachably connected with the packing rubber core 16, a hole penetrating up and down is processed in the packing rubber core 16, the upper end of the hole is tapered and contracted, the size of the hole is matched with a drill rod, the upper gland 19 and the lower gland 111 are both sleeved outside the sleeve 110 and are respectively used for being pressed on the upper side and the lower side of the multi-disc bearing 14, the upper gland 19 and the lower gland 111 are both detachably connected with the bearing seat 13, a spring gasket 12 and two flat gaskets 11 are arranged at the connection part of the upper end of the bearing seat 13 and the drill rod, and the spring gasket 12 is between the two flat gaskets 11, the upper gland 19 and the lower gland 111 are sleeved with sealing rings 15 at the positions contacted with the sleeve 110, and the sealing rings 15 are rotating shaft lip-shaped sealing rings 15;
as shown in fig. 3 and 4, dust fall pipe 23 adopts phi 180 mm's seamless pipe, dust fall pipe 23's one end welding has flange two 24, flange two 24 and flange 113 are connected through screw bolt and nut, spout device includes a plurality of nozzles and a plurality of copper pipe 22, a plurality of nozzle interval evenly distributed are at the other end of dust fall pipe 23, a plurality of copper pipe 22 one end penetrate dust fall pipe 23 respectively and correspond and a plurality of nozzle connection, a plurality of copper pipe 22 other ends communicate each other and external pressure water source, the quantity of nozzle is 6, the ring distributes, copper pipe 22 corresponds with nozzle quantity, the nozzle adopts vaporific shower nozzle 21.
The working principle is as follows: blowout prevention, noise reduction and dust removal: the base 18 plays a role of being connected with a pipeline of a wellhead, the stability of the whole device is ensured, the tee joint seat 17 is positioned above the base 18 and mainly plays a role in guiding waste residues and waste gas, the adverse effect that the construction environment is severe due to the fact that the waste residues and the waste gas impact a drilling platform in the front face is prevented, the waste residues and the waste gas are guided out along a side pipe opening, the bearing seat 13 mainly plays a role in fixing the sealing rubber core 16, the sealing rubber core 16 rotates along with a drill rod, abrasion of the sealing rubber core 16 is reduced, and the service cycle of the sealing rubber core 16 is prolonged;
the installation of the blowout prevention unit 1 is favorable for improving the construction environment, preventing the potential safety hazard caused by directly spraying rock powder and underground water to an operating room and a workbench of a drilling platform, being favorable for quickly discharging the rock powder in a well hole to the ground, reducing repeated drilling and improving the drilling speed;
the length of the dust falling pipe 23 is 4 meters, the dust falling pipe mainly has the main effects that waste residues and waste gases are guided to a longer distance and then subjected to dust falling treatment, the waste residues and the waste gases move forwards along the dust falling pipe 23 and are connected with a pressure water source, 6 nozzles atomize water and spray the water to the other end port of the dust falling pipe 23, the water is sprayed to the guided waste residues and waste gases, the dust falling effect can be effectively achieved, air pollution is basically avoided, and green reconnaissance is achieved;
sampling: the waste residues are guided out and then fall near the other end port of the dust falling pipe 23 in a centralized manner, no scattered floating is generated, and the collection and sampling are convenient.
The bearing 14, the seal ring 15, the nozzle and the gasket are all prior art.
The above-described embodiments should not be construed as limiting the scope of the present invention, and any alternative modifications or alterations to the embodiments of the present invention will be apparent to those skilled in the art.
The present invention is not described in detail, but is known to those skilled in the art.
Claims (8)
1. The utility model provides a be applied to well head in the air drilling prevent spouting, fall make an uproar, remove dust, sampling device which characterized in that: including preventing spouting unit and dust fall unit, prevent spouting the unit and include base, three-way seat and bearing frame, base, three-way seat and bearing frame coaxial line are from upwards dismantling the connection down in proper order, the base sets up in the top of well head, and the pipeline of base lower extreme and well head can be dismantled and be connected, the external drilling rod in bearing frame upper end, the dust fall unit includes dust fall pipe and spout device, the dust fall pipe is horizontal, three-way seat with the connection can be dismantled to the one end of dust fall pipe, the spout device sets up the other end of dust fall pipe.
2. The wellhead blowout prevention, noise reduction, dust removal and sampling device applied to air drilling as claimed in claim 1, wherein: the base is of a structure with an upper opening and a lower opening, the lower end of the base is connected with a pipeline of a wellhead in an inserting mode, and a third flange is arranged at the upper end of the base.
3. The wellhead blowout prevention, noise reduction, dust removal and sampling device applied to air drilling as claimed in claim 2, wherein: the tee bend seat is three way connection style structure, the tee bend seat includes the mouth of pipe, down mouth of pipe and side mouth of pipe, the top mouth of pipe is provided with flange four, and through flange four with the connection can be dismantled to the bearing frame, down the mouth of pipe be provided with flange five, and through flange five with the connection can be dismantled to flange three, the side mouth of pipe is provided with flange one, and through flange one with the connection can be dismantled to the one end of dust fall pipe.
4. A wellhead blowout prevention, noise reduction, dust removal and sampling device applied to air drilling according to claim 3, wherein: the bearing frame includes the sealed core of gluing, goes up the gland, sleeve, connection pad and polydisc bearing down, the sleeve suit is in the bearing frame, polydisc the bearing is all arranged the suit from top to bottom outside the sleeve, the connection pad upper end can be dismantled and be connected the sleeve lower extreme, the connection pad is uncovered from top to bottom, the connection pad lower extreme with the sealed core of gluing can be dismantled and is connected, be provided with the hole that link up from top to bottom in the sealed core of gluing, the upper end toper shrink in hole, the size and the drilling rod cooperation in hole, it all suits to go up gland and gland down outside the sleeve, and be used for the pressure equipment respectively at the polydisc upside and the downside of bearing, go up gland and gland all with the bearing frame can be dismantled and be connected.
5. The wellhead blowout prevention, noise reduction, dust removal and sampling device applied to air drilling according to claim 4, wherein: the dust fall pipe adopts seamless pipe, the one end welding of dust fall pipe has flange two, flange two with the connection can be dismantled to flange one, the spout device includes a plurality of nozzles and a plurality of copper pipe, and is a plurality of nozzle interval evenly distributed is in the other end of dust fall pipe, it is a plurality of copper pipe one end pierces through respectively the dust fall pipe corresponds and is a plurality of the nozzle is connected, and is a plurality of the copper pipe other end communicates and external pressure water source each other, the nozzle adopts vaporific shower nozzle.
6. The wellhead blowout prevention, noise reduction, dust removal and sampling device applied to air drilling as claimed in claim 5, wherein: the upper gland and the lower gland are sleeved with sealing rings at the positions contacted with the sleeve, and the sealing rings are rotary shaft lip-shaped sealing rings.
7. The wellhead blowout prevention, noise reduction, dust removal and sampling device applied to air drilling as claimed in claim 6, wherein: and a spring gasket and a plurality of flat gaskets are arranged at the joint of the upper end of the bearing seat and the drill rod.
8. The wellhead blowout prevention, noise reduction, dust removal and sampling device applied to air drilling according to claim 7, wherein the device comprises: the bearing is a deep groove ball bearing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210795862.2A CN115012867A (en) | 2022-07-07 | 2022-07-07 | Wellhead blowout prevention, noise reduction, dust removal and sampling device applied to air drilling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210795862.2A CN115012867A (en) | 2022-07-07 | 2022-07-07 | Wellhead blowout prevention, noise reduction, dust removal and sampling device applied to air drilling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115012867A true CN115012867A (en) | 2022-09-06 |
Family
ID=83078800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210795862.2A Pending CN115012867A (en) | 2022-07-07 | 2022-07-07 | Wellhead blowout prevention, noise reduction, dust removal and sampling device applied to air drilling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115012867A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117052340A (en) * | 2023-08-14 | 2023-11-14 | 山东鼎推岩土工程有限公司 | Anti-splashing device and method for down-the-hole hammer construction |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU1790672C (en) * | 1991-04-25 | 1993-01-23 | Сергей Иванович Леваков | Dust arrester applicable in drilling |
| CN103174389A (en) * | 2013-03-01 | 2013-06-26 | 安徽恒源煤电股份有限公司 | Drilling construction blowout prevention and dust fall device |
| CN207660568U (en) * | 2017-11-17 | 2018-07-27 | 中石化石油工程技术服务有限公司 | A kind of low pressure rotation dust guard |
| CN212508162U (en) * | 2020-07-07 | 2021-02-09 | 河北石探机械制造有限责任公司 | Well head scummer is used in drilling of positive circulation of air |
| CN113047792A (en) * | 2021-04-07 | 2021-06-29 | 吉林大学 | A sealed dust collector in drill way for air bores |
-
2022
- 2022-07-07 CN CN202210795862.2A patent/CN115012867A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU1790672C (en) * | 1991-04-25 | 1993-01-23 | Сергей Иванович Леваков | Dust arrester applicable in drilling |
| CN103174389A (en) * | 2013-03-01 | 2013-06-26 | 安徽恒源煤电股份有限公司 | Drilling construction blowout prevention and dust fall device |
| CN207660568U (en) * | 2017-11-17 | 2018-07-27 | 中石化石油工程技术服务有限公司 | A kind of low pressure rotation dust guard |
| CN212508162U (en) * | 2020-07-07 | 2021-02-09 | 河北石探机械制造有限责任公司 | Well head scummer is used in drilling of positive circulation of air |
| CN113047792A (en) * | 2021-04-07 | 2021-06-29 | 吉林大学 | A sealed dust collector in drill way for air bores |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117052340A (en) * | 2023-08-14 | 2023-11-14 | 山东鼎推岩土工程有限公司 | Anti-splashing device and method for down-the-hole hammer construction |
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