KR101643659B1 - Slide Type Air Hammer - Google Patents

Slide Type Air Hammer Download PDF

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Publication number
KR101643659B1
KR101643659B1 KR1020160042734A KR20160042734A KR101643659B1 KR 101643659 B1 KR101643659 B1 KR 101643659B1 KR 1020160042734 A KR1020160042734 A KR 1020160042734A KR 20160042734 A KR20160042734 A KR 20160042734A KR 101643659 B1 KR101643659 B1 KR 101643659B1
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KR
South Korea
Prior art keywords
guide groove
inclined guide
bit
along
hammering
Prior art date
Application number
KR1020160042734A
Other languages
Korean (ko)
Inventor
양승일
정종선
Original Assignee
(주)이엔피엔지니어링
주식회사 성원중기계
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Priority to KR1020160042734A priority Critical patent/KR101643659B1/en
Application granted granted Critical
Publication of KR101643659B1 publication Critical patent/KR101643659B1/en

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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
    • E21B10/00—Drill bits
    • E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22—Piles
    • E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
    • 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
    • E21B10/00—Drill bits
    • E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
    • E21B10/32—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
    • 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
    • E21B10/00—Drill bits
    • E21B10/36—Percussion drill bits
    • E21B10/40—Percussion drill bits with leading portion
    • 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
    • E21B10/00—Drill bits
    • E21B10/62—Drill bits characterised by parts, e.g. cutting elements, which are detachable or adjustable
    • 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
    • E21B6/00—Drives for drilling with combined rotary and percussive action
    • 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
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/02—Drilling rigs characterised by means for land transport with their own drive, e.g. skid mounting or wheel mounting
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2250/00—Production methods
    • E02D2250/0038—Production methods using an auger, i.e. continuous flight type

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Earth Drilling (AREA)

Abstract

The present invention relates to an expandable air hammer coupled to a lower end of a connecting rod assembled with an excavator, and is equipped with a rod connecting adapter (110) for engaging with a connecting rod at an upper end thereof and a slant guide groove (120) (100); And a guide member 120 mounted on the inclined guide groove 120 and engaged with the inclined guide groove 120 to slide along the guide groove 120. When the guide member 120 is lifted along the inclined guide groove 120, And a positioning bit unit (200) projecting in a horizontal direction and protruding in a vertical direction from a lower surface of the hammering main body (100) when descending along the inclined guide groove unit (120) The biting part 200 is lowered and moved along the inside of the excavation hole in the process of descending or raising the biting part 200. In the extended excavation process of the lower end of the excavation hole, The drilling bit portion 200 is in contact with the bottom surface of the excavation hole and protrudes outside the outer circumferential surface of the hammer main body 100 along the inclined guide groove portion 120 to expand the inside diameter of the excavation hole It characterized by comprising.

Description

Slide Type Air Hammer Slide Type Air Hammer

The present invention relates to an air hammer coupled to a lower end of a connecting rod assembled in an excavator, and is characterized in that a positioning bit portion is slidably protruded to extend an inner diameter of a lower end portion of the excavation hole after a primary excavation operation.

Typically, during the foundation work of a building, first the ground is pierced with an excavator and the pore is filled with concrete with the steel pipe or steel frame by the hole. In order to prevent the subsidence of the ground while sufficiently holding the weight of the building, Of the hole or extend the diameter of the hole.

However, in the conventional excavation using a hammer, the upper and lower portions of the hole have a uniform diameter, so that it takes a lot of time and cost to drill deep and large holes, and the equipment has to be enlarged.

This problem can be solved by introducing a device capable of locally expanding only the lower end of the hole to be drilled. In order to solve such a problem, "Variable drilling hammers for pile tip extension (Patent No. 10-0990201)" It has been proposed.

As shown in FIG. 1, the hydraulic cylinder 300 descends the ascending / descending block 400 to open each of the air drills 200 to the outside, As shown in the cross-sectional view of FIG. 1, in order to obtain a structure in which the air hammer 200 is pulled up due to the descent of the ascending / descending block 400, The upper end of the hammering unit 200 and the ball mount 510 through which the body of the air hammering unit 200 passes must be inclined at an angle with respect to each other.

As the upper end of the air hammer 200 is coupled to the lifting block 400 and the air hammer 200 protrudes downward as the lifting block 400 descends, And the lifting and lowering block 400 are concentrated and may be damaged.

Further, since a complicated mechanical structure such as the hydraulic cylinder 300, the ascending / descending block 400, and the ball mount 510 must be installed, the cost of the product increases and the replacement time for the hammering is excessively increased.

Therefore, it is urgently required to introduce a new type air hammer which can be drilled through a quick hitch replacement with a simpler structure to reduce the perforation cost.

In order to solve the above-mentioned problems, the object of the present invention is as follows.

First, it is an object of the present invention to provide an expandable air hammer with a new structure that can expand or collapse the bit for exploitation in a simpler and simpler manner.

Secondly, it is another object of the present invention to provide an expandable air hammer with a new structure that can ensure durability and reliability by eliminating complicated mechanical devices.

Third, it is another object of the present invention to provide an expandable air hammer of a new structure capable of stably carrying out an extended excavation.

Technical features of the present invention are as follows.

The present invention relates to an expandable air hammer which is coupled to a lower end of a connecting rod assembled with an excavator, and is equipped with a rod connecting adapter (110) for engaging with a connecting rod at an upper end thereof and an inclined guide groove (120) A hammer body 100; And a guide member 120 mounted on the inclined guide groove 120 and engaged with the inclined guide groove 120 to slide along the guide groove 120. When the guide member 120 is lifted along the inclined guide groove 120, And a positioning bit unit (200) projecting in a horizontal direction and protruding in a vertical direction from a lower surface of the hammering main body (100) when descending along the inclined guide groove unit (120) The biting part 200 is lowered and moved along the inside of the excavation hole in the process of descending or raising the biting part 200. In the extended excavation process of the lower end of the excavation hole, The drilling bit portion 200 is in contact with the bottom surface of the excavation hole and protrudes outside the outer circumferential surface of the hammer main body 100 along the inclined guide groove portion 120 to expand the inside diameter of the excavation hole It characterized by comprising.

Technical effects of the configuration of the present invention are as follows.

First, you can expand or collapse the bits of the extension in a simpler and simpler way.

In other words, the positioning bit unit 200 is mounted in the inclined guide groove 120 of the hammering body 100 and is coupled to perform the sliding movement along the inclined guide groove 120. In the inclined guide groove 120, The inclined guide groove 120 is inclined upwardly from the center of the lower surface of the main body 100 to the outer circumferential surface of the side surface of the hammering main body 100. Due to the inclined direction of the inclined guide groove 120, 120, the positioning bit unit 200 protrudes in the horizontal direction from the outer peripheral surface of the hammering body 100 and descends along the inclined guide groove 120 as shown in FIG. 3 (a) As shown in FIG. 3 (b), protrudes downward in the vertical direction on the lower surface of the hammering body 100.

Second, by eliminating complicated mechanical devices, it is possible to secure durability and reliability, and shorten the replacement time of hammers.

In other words, in the process of descending or rising along the inside of the drilling hole, the drilling bit 200 is lowered and the hammer body 100 can be moved along the inside of the drilling hole. In the extension drilling process of the lower end of the drilling hole, The positioning bit unit 200 protruding in the vertical direction from the lower surface of the hammering body 100 protrudes outside the outer circumferential surface of the hammering body 100 while being raised along the inclined guide groove 120 by being in contact with the bottom surface of the excavation hole, Excavation is performed so as to extend the inner diameter of the hole, so that it is not necessary to provide a separate mechanical device, and durability and reliability can be improved. In addition, a separate hydraulic line connection work for expanding the bitmap portion 200 is unnecessary, so that the hammer can be replaced more quickly.

Third, expansion drilling can be performed stably.

4, a bit body fixing groove 150 is formed in the upper end of the stopper receiving groove 140 of the inclined guide groove 120 so as to receive the upper end of the stopper 230 up to a predetermined depth The stopper 230 of the positioning bit unit 200 is resiliently supported by the spring 240 mounted inside the bit body 210 so that the stopper 230 of the positioning bit unit 200 ascends and descends while being in close contact with the stopper receiving groove 140, When it reaches the fixing groove 150, it ascends by the elastic force of the spring 240 and is seated in the bit body fixing groove 150. When the downward external force of a certain magnitude or more does not act, So that it is possible to perform more stable excavation at the time of the extended excavation.

Figure 1 illustrates by way of example the prior art.
FIG. 2 shows an exploded perspective view of a specific embodiment of the present invention with a revealing bit portion 200 and a main body 100, wherein the reveal bit portion 200 is shown only for convenience.
3 shows a state in which the positioning bit unit 200 is raised and protruded from the outer circumferential surface of the hammering body 100 and (b) the positioning bit unit 200 is lowered to the lower portion of the hammering body 100 And a protruded state, respectively.
4 is a sectional view showing a state in which the positioning bit unit 200 and the hammer body 100 are engaged with each other. FIG. 4 shows a state in which the positioning bit unit 200 is raised and protruded horizontally from the outer peripheral surface of the hammer body 100 do.
FIG. 5 shows a stepwise enlargement of the lower end of the excavation hole through the three-step drilling process.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

The present invention relates to an expandable air hammer coupled to the lower end of a connecting rod to be assembled with an excavator.

2, the hammock main body 100 is provided with a rod connecting adapter 110 which is coupled to a connecting rod at an upper end thereof and is provided with an inclined guiding groove 120 formed by cutting the inside of a lower end thereof, 120 are slidably coupled to each other. In addition, although not shown separately in the drawings, a plurality of cemented carbide balls are mounted on the lower surface (bottom surface) of the hammering body.

The positioning bit unit 200 is mounted inside the inclined guiding groove 120 of the hammering main body 100 and is coupled to slide along the inclined guiding groove 120.

The inclined guide grooves 120 are formed to be upwardly inclined from the center of the lower surface of the hammering body 100 to the outer circumferential surface of the side surface of the hammering body 100. Due to the inclined direction of the inclined guide grooves 120, 3 (a), the positioning bit unit 200 is projected in the horizontal direction on the outer peripheral surface of the hammer body 100, and the inclined guide groove portion 120 is formed in the inclined guide groove portion 120, 3 (b), the lower portion of the hammering body 100 protrudes downward in the vertical direction.

That is, in the course of descending or rising along the inside of the drilling hole, the drilling bit 200 is lowered and the hammer body 100 can be moved along the inside of the drilling hole. In the process of extending and drilling the lower end of the drilling hole, 100 are projected to the outside of the outer circumferential surface of the hammer body 100 while rising along the inclined guide groove 120 by abutting against the bottom surface of the excavation hole, The excavation is performed to expand the inner diameter of the pipe.

In other words, the positioning bit unit 200 is slidably opened or folded without a separate mechanical device.

As shown in FIG. 2, the inclined guide groove 120 of the hammering body 100 extends from the inside of the inclined guide groove 120 to the lower surface of the hammering body 100 along the left and right sides, The upper surface of the inside of the inclined guide groove 120 is formed so as to be inclined in parallel to the elevating and lowering guide groove 130. The inclined guide groove 120 The stopper receiving groove 140 is cut along the upper surface of the inner side.

The positioning bit unit 200 includes a bit body 210, a lifting / lowering guide protrusion 220, a stopper 230, and the like.

The bit body 210 protrudes from the outer circumferential surface or the lower surface of the hammer body 100 while moving up and down along the inclined guide groove 120. On the outer surface of the bit body 210, a plurality of cemented carbons are attached, though not separately shown in the accompanying drawings.

Up and down guide protrusions 220 protrude from the left and right sides of the bit body 210 and are accommodated in the up and down guide grooves 130 in the inclined guide groove 120, respectively.

The upper surface of the bit body 210 is in close contact with the inner upper surface of the inclined guide groove 120 while being inclined in parallel to the elevating and lowering guide groove 130. The upper surface of the bit body 210 is gently The upper surface of the inclined guide groove 120 which is in contact with the upper surface of the inclined guide groove 120 is gently recessed in an arc shape so that the hitting force of the hammering body 100 is properly transmitted to the bit body 210, The hammer body 100 supports the bit body 210 more stably when the hammer body 100 rotates.

The stopper 230 is installed inside the bit body 210 and protrudes in a vertical direction from one side of the upper surface of the bit body 210 and has a stopper receiving groove 140 formed along the inner upper surface of the inclined guide groove 120 Move along.

The stopper 230 reciprocates only in the stopper receiving groove 140 to restrict the upward and downward distance of the bitmap portion 200. When the bitmap portion 200 is separated from the inclined guide groove portion 120, .

As shown in FIG. 4, the upper end of the stopper receiving groove 140 of the inclined guide groove 120 is further provided with a bit body fixing groove 150 which is upwardly punched up to a certain depth to receive the upper end of the stopper 230, The stopper 230 of the positioning bit unit 200 is elastically supported by the spring 240 mounted inside the bit body 210 and is lifted up and down in a state of being closely contacted with the stopper receiving groove 140, 150, it ascends by the elastic force of the spring 240 and is seated in the bit body fixing groove 150. When the downward external force of a predetermined magnitude or more does not act, the state of protruding outside the outer peripheral surface of the hammer body 100 .

Therefore, when the drilling main body 100 is pulled out, the drilling hole can be stably excavated when the drilling rig is completed. When the drilling main body 100 is pulled out, the drill bit 200 is brought into contact with the inner diameter of the drill hole, As the spring 240 is compressed by applying an external force, the stopper 230 moves away from the bit body fixing groove 150, and the positioning bit unit 200 is lowered and slidably folded, Lt; / RTI >

Hereinafter, a PRD method using a slide type expanding air hammer will be described.

(1) Step 1

This is the process of measuring the coordinates on the plane of the location where the pile is to be installed using a light wave and marking it on the site.

(2) Step 2

It is the process of installing the out casing after installing the pile at the location where the pile is to be installed, and pouring the concrete outside the out casing. Wind the Teflon around the outer surface of the out casing to facilitate the detachment of the out casing before pouring the concrete.

(3) Step 3

When the concrete is cured, the outer casing is pulled out and removed, and a screw auger and an in-casing are inserted at a position where the outer casing is detached to excavate up to 1 to 2 m of weathered rock. This is the stage of car drilling.

(4) Step 4

This is the second drilling step shown in FIG. 5 as a process of replacing with an air hammer and digging up to the upper end of the pile.

(5) Step 5

This is the third drilling step shown in Fig. 5 as an extended drilling process in which the inner diameter of the section from the upper end to the lower end of the pile is expanded by replacing the slide type expanding air hammer.

However, in the case of the present invention, in the case of the present invention, the upper end portion to the lower end portion of the pile is extended by a sliding type expansion type Air drilling is used to extend the inside diameter and to achieve vertical excavation simultaneously.

(6) Step 5-1

It is a process of removing a slime precipitated at the bottom of a drilling hole with a mechanical pump in the drilling process.

(7) Step 5-2

This is the process of verifying the verticality of the excavator using Koden equipment.

(8) Step 6

It is a process of lifting steel members and reinforcing net, inserting them into drilling holes, pouring concrete into drilling holes, and then pulling out and removing the grouting.

In some cases, considering the site conditions, concrete can be laid in the excavation hole first, and the steel frame member can be lifted and inserted into the excavation hole, and then the incise can be pulled out and removed.

In this process, parts without detailed explanation will be done in the same way as general PRD method.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, Addition, deletion and simple numerical limitation of the present invention are also included in the protection scope of the present invention.

100: Hammer body
110: Load connection adapter
120: inclined guide groove
130: ascending / descending guide groove
140: stopper accommodating groove
150: bit body fixing groove
200:
210: bit body
220: ascending / descending guide projection
230: Stopper
240: spring

Claims (7)

To an expanding air hammer coupled to the lower end of a connecting rod assembled with an excavator,
A hammer main body 100 having a rod connecting adapter 110 which is coupled to a connecting rod at an upper end thereof and having an inclined guide groove 120 formed to be cut inside the lower end thereof; And
The hammering body 100 is installed in the inclined guide groove 120 and is engaged to slide along the inclined guide groove 120. When the hammering body 100 rises along the inclined guide groove 120, A bit portion 200 which is protruded from the lower surface of the hammering body 100 and protruded in the vertical direction when the hammering body 100 descends along the inclined guide groove 120;
The biting part 200 can be lowered and moved along the inside of the excavation hole in the process of descending or rising along the inside of the excavation hole, The biting part 200 protruding in the vertical direction from the lower surface of the hammering body 100 protrudes outside the outer circumferential surface of the hammer body 100 while rising along the inclined guide groove part 120 Excavation is performed to expand the inside diameter of the excavation hole,
In the inclined guide groove portion 120 of the hammer body 100,
Descending guide groove (130) extending from the inner side of the inclined guide groove part (120) to the lower surface of the hammering main body (100) along the left and right sides and guiding the ascending and descending of the positioning bit part (200); And
The upper surface of the inside of the inclined guiding grooves 120 is inclined in parallel to the elevating guiding grooves 130. The stopper receiving grooves 140 are formed along the upper surface of the inclined guiding grooves 120, ;
Lt; / RTI >
In the bit allocation unit 200,
A bit body 210 protruding upward and downward along the inclined guide groove 120;
Up and down guide protrusions 220 protruding from left and right sides of the bit body 210 and received in the up and down guide grooves 130, respectively; And
The upper surface of the bit body 210 is inclined in parallel with the rising and falling guide groove 130 and protruded in a vertical direction from one side of the upper surface of the bit body 210, A moving stopper 230;
Lt; / RTI >
The stopper 230 reciprocates only in the stopper receiving groove 140 to restrict the upward / downward distance of the positioning bit unit 200 and prevent the positioning bit unit 200 from being detached and separated,
A bit body fixing groove 150 formed in the upper end of the stopper receiving groove 140 of the inclined guide groove 120 to be upwardly punched up to a predetermined depth to receive the upper end of the stopper 230;
The stopper 230 of the positioning bit unit 200 is resiliently supported by the spring 240 mounted in the bit body 210 so as to be brought into close contact with the stopper receiving groove 140 When the bit body fixing groove 150 reaches the bit body fixing groove 150, it rises by the elastic force of the spring 240 and is seated in the bit body fixing groove 150. If the downward external force of a predetermined magnitude or more does not act, And the protruded state is maintained outside the outer peripheral surface of the main body (100). The method of claim 1,
Wherein the upper surface of the bit body (210) has a shape that gently protrudes in an arc shape, and an upper surface inside the inclined guide groove (120) abutting the bit body has a shape that is gently recessed in an arc shape. Air hammer. The method of claim 1,
Wherein the positioning bit unit (200) is replaceable in accordance with a standard of a drilling hole. delete delete delete delete
KR1020160042734A 2016-04-07 2016-04-07 Slide Type Air Hammer KR101643659B1 (en)

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KR1020160042734A KR101643659B1 (en) 2016-04-07 2016-04-07 Slide Type Air Hammer

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107604914A (en) * 2017-10-11 2018-01-19 苏州海森伯格环保科技有限公司 A kind of environmentally friendly water conservancy projects
CN110130832A (en) * 2019-06-11 2019-08-16 广汉珂普瑞科技有限公司 A kind of centrifugal casing drilling tool and its manufacturing method
CN110145237A (en) * 2019-06-25 2019-08-20 无锡贝佳尔科技有限公司 A kind of down-the-hold drill bit for bore expanded hole
KR20200019365A (en) * 2018-08-14 2020-02-24 심재홍 Bumpy hole extention bits assembly and rock bolt construction method using bumpy hole
KR102089466B1 (en) * 2019-09-18 2020-03-16 광성지엠(주) Drilling bit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100043600A (en) * 2008-10-20 2010-04-29 정영주 Underground excuvation pile construction method using percussion rotary drill
KR101132704B1 (en) * 2011-07-11 2012-04-02 (주)세종이엔씨 Excavating bit structure available expands the hollow in the base rock

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100043600A (en) * 2008-10-20 2010-04-29 정영주 Underground excuvation pile construction method using percussion rotary drill
KR101132704B1 (en) * 2011-07-11 2012-04-02 (주)세종이엔씨 Excavating bit structure available expands the hollow in the base rock

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107604914A (en) * 2017-10-11 2018-01-19 苏州海森伯格环保科技有限公司 A kind of environmentally friendly water conservancy projects
CN107604914B (en) * 2017-10-11 2018-11-16 广东润威建设工程有限公司 A kind of water conservancy projects of environmental protection
KR20200019365A (en) * 2018-08-14 2020-02-24 심재홍 Bumpy hole extention bits assembly and rock bolt construction method using bumpy hole
KR102110333B1 (en) 2018-08-14 2020-05-13 심재홍 Bumpy hole extention bits assembly and rock bolt construction method using bumpy hole
CN110130832A (en) * 2019-06-11 2019-08-16 广汉珂普瑞科技有限公司 A kind of centrifugal casing drilling tool and its manufacturing method
CN110145237A (en) * 2019-06-25 2019-08-20 无锡贝佳尔科技有限公司 A kind of down-the-hold drill bit for bore expanded hole
KR102089466B1 (en) * 2019-09-18 2020-03-16 광성지엠(주) Drilling bit

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