CN108756758A - A kind of gob side entry driving thin coal pillar strengthening construction Counterboring apparatus - Google Patents
A kind of gob side entry driving thin coal pillar strengthening construction Counterboring apparatus Download PDFInfo
- Publication number
- CN108756758A CN108756758A CN201810580214.9A CN201810580214A CN108756758A CN 108756758 A CN108756758 A CN 108756758A CN 201810580214 A CN201810580214 A CN 201810580214A CN 108756758 A CN108756758 A CN 108756758A
- Authority
- CN
- China
- Prior art keywords
- card slot
- drillstock
- counterboring apparatus
- drill bit
- reaming
- Prior art date
- 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
- 239000003245 coal Substances 0.000 title claims abstract description 38
- 238000010276 construction Methods 0.000 title claims abstract description 19
- 238000005728 strengthening Methods 0.000 title claims abstract description 13
- 238000003825 pressing Methods 0.000 claims abstract description 4
- 238000005553 drilling Methods 0.000 claims description 17
- 239000000956 alloy Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 239000000284 extract Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- UQZIWOQVLUASCR-UHFFFAOYSA-N alumane;titanium Chemical compound [AlH3].[Ti] UQZIWOQVLUASCR-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/28—Enlarging drilled holes, e.g. by counterboring
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)
- Earth Drilling (AREA)
Abstract
The present invention provides a kind of gob side entry driving thin coal pillar strengthening construction reaming bits comprising drillstock and drill bit, wherein is provided with the card slot being evenly arranged along the circumferencial direction of drillstock on drillstock, reamer piece is equipped in card slot；Drill bit is normal drill bit or reaming bit.The front end of reaming bit is provided with is unfolded from card slot and is closed the navigation button being accommodated in card slot for controlling reamer piece, and when pressing navigation button, reamer piece is unfolded from the card slot.
Description
Technical field
The present invention relates to coal mine Counterboring apparatus more particularly to a kind of gob side entry driving thin coal pillar strengthening construction to be filled with reaming
It sets.
Background technology
Gob side entry driving is a kind of technology of China's coal-mine layout of actual mining roadway and maintenance, i.e., steady in upper curtate working face extraction
After fixed, thin coal pillar is left along the mined out area edge of upper curtate to maintain this section working face extraction tunnel.Back mainly according to
It is supported by thin coal pillar, and thin coal pillar is mainly made of coal, intensity is low, and self-bearing ability is limited, so needing the branch of reinforcement thin coal pillar
Support ability.
Since the coal column both sides construction time is mostly at 1 year or more, goaf side is closed already when newly digging tunnel, existing skill
The two-way reinforcing of coal column unilateral side construction may be implemented in swollen locking-type two-ended cables in art.But goaf side is often found in the construction process
Slump is closely knit, and the space very little to play a role for swollen tapered end is even without space, therefore swollen locking-type two-ended cables are reinforced
Optimum efficiency is often not achieved in coal column.Therefore, if the swollen of the swollen locking-type anchor cable of a confession can be bored at the certain depth of thin coal pillar
The space that tapered end plays a role, then swollen locking-type two-ended cables reinforce this technology of coal column by not by whether have space limited and
It plays one's part to the full.However existing mining drill bit can only bore isodiametric straight hole, i.e., whole bore dia is less than or equal to opening diameter.
In boring the drilling of equal diameter straight hole, such drill bit is technically ripe, but can not develop a kind of whole bore dia so far
The gob side entry driving thin coal pillar in sufficient space is provided adds to reinforce coal column and play one's part to the full to wear anchor cable more than opening diameter
Gu construction Counterboring apparatus.
Invention content
The present inventor devises a kind of gob side entry driving thin coal pillar strengthening construction Counterboring apparatus in view of above-mentioned technical problem,
When swollen locking-type two-ended cables are constructed, at drilling arrival designated depth, enlarged footing is formed using reaming bit, makes two-ended cables
Both ends are pressurized when stress, change traditional inner end tension, the mechanical structure that outer end is pressurized, force structure is more scientific, to make
Two-ended cables can bear the pulling capacity of bigger.
In order to achieve the above technical purposes, the present invention specifically uses following technical solution：
A specific implementation mode according to the present invention provides a kind of gob side entry driving thin coal pillar strengthening construction and is filled with reaming
It sets, wherein Counterboring apparatus includes drillstock and the drill bit that is removably installed on drillstock；The circle along drillstock is provided on drillstock
The card slot that circumferential direction is evenly arranged, is equipped with reamer piece in card slot, and drill bit is normal drill bit or reaming bit.
Counterboring apparatus according to an embodiment of the invention, wherein reaming bit front end is provided with to be expanded for controlling
Hole drill piece is unfolded or is closed from card slot to be accommodated in navigation button in card slot, wherein when pressing navigation button, reamer piece from
Card slot is unfolded.
Counterboring apparatus according to an embodiment of the invention, wherein the original state diameter of reaming bit is bored with common
The diameter of head is identical.
Counterboring apparatus according to an embodiment of the invention, wherein card slot is 2~5.
Counterboring apparatus according to an embodiment of the invention, wherein when reamer piece is unfolded from card slot, deployment diameter
It is 3~7 times of original state diameter.
Counterboring apparatus according to an embodiment of the invention, wherein reamer piece is articulated and connected with drillstock.
Counterboring apparatus according to an embodiment of the invention, wherein a diameter of 50~70mm of normal drill bit.
Counterboring apparatus according to an embodiment of the invention, wherein reamer piece is made of high-temperature alloy material.
A specific implementation mode according to the present invention provides a kind of Counterboring apparatus pair using any one as described above
The method that gob side entry driving thin coal pillar carries out strengthening construction comprising following steps：
Step (1)：Normal drill bit is installed on the drillstock of Counterboring apparatus, is drilled using normal drill bit, until arriving
Stop drilling after up to the position for needing enlarged footing, extracts Counterboring apparatus；
Step (2)：Lower normal drill bit is dismantled from drillstock and is changed to reaming bit, and reaming bit is sent into drilling, and
It is pushed into the bottom hole of drilling；
Step (3)：After reaming bit is pushed to bottom hole, the positioning being set on reaming bit is pushed away further along with strength
Button is contacted with coal wall and is pressed, and reamer piece is unfolded from the card slot on drillstock immediately, and starts to cut coal wall, forward
Propulsion forms cylindrical space；
Step (4)：After completing reaming, the aperture drilled out by normal drill bit, drillstock reversely rotates, and reamer piece, which resets, to be received
It is contained in card slot, to take out reaming bit.
It is according to an embodiment of the invention carry out strengthening construction method, wherein need bore major part position be away from
At 3000~4000mm of thin coal pillar surface, it is 300~500mm, cylindrical space a diameter of 250 that expansion, which bores piece and pushes ahead distance,
~350mm, length are identical as advance distance.
Description of the drawings
Fig. 1 is the construction signal that gob side entry driving thin coal pillar strengthening construction using the present invention carries out reaming with Counterboring apparatus
Figure；
Fig. 2 is the gob side entry driving thin coal pillar strengthening construction Counterboring apparatus of the present invention in installation reaming bit and is in reaming
Bore the schematic diagram of piece open configuration；
Fig. 3 A are internal structure schematic diagram when reaming bit does not open；
Fig. 3 B are internal structure schematic diagram when reaming bit opens.
Reference sign：
1 thin coal pillar；
2 drillings；
3 enlarged footings；
4 reamer pieces；
5 card slots；
6 navigation buttons；
7 pressure push-rods；
8 rail plates；
9 extendable brackets；
10 limit bodies.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
It is appreciated that gob side entry driving thin coal pillar strengthening construction reaming provided by the present invention in conjunction with Fig. 2 and Fig. 3 A and Fig. 3 B
The principle of device, the Counterboring apparatus include drillstock and the drill bit that is removably installed on drillstock, wherein are provided on drillstock
The card slot 5 being evenly arranged along the circumferencial direction of drillstock, is equipped with reamer piece 4 in card slot 5；Drill bit is normal drill bit or reaming
Drill bit.It is provided in reaming bit front end and is unfolded and is closed to be accommodated in card slot 5 from card slot 5 for controlling reamer piece 4
Navigation button 6, wherein when pressing navigation button 6, pressure push-rod 7 drives extendable bracket 9 along the longitudinal sliding motion of drillstock
It is moved along rail plate 8, so that the reamer piece 4 attached on extendable bracket 9 is unfolded from card slot 5, until reaching card slot 5
The limit body 10 of rear is limited the limit of body 10, to reach maximum expansion degree.The original state diameter of reaming bit with it is general
Logical drill bit is identical.
Be illustrated in figure 2 the present invention Counterboring apparatus installation reaming bit and reamer piece 4 be in open configuration
Schematic diagram, as shown in Fig. 2, since the direction of advance that reamer piece 4 drills relative to drill bit is articulated with card slot 5 with the rear part
In, and the direction of its front end is arranged with respect to drill bit advancing direction towards front with angle when the expansion of reamer piece 4, causes
Reamer piece 4 can be received into card slot 5 when recalling drill bit backward.Further specifically, as shown in figs.3 a and 3b, work as drill bit
Extendable bracket 9 is unfolded backward under the effect of pressure push-rod 7 when drilling forward, and 4 expanded angle of reamer piece is made to be gradually expanded；Instead
It, when drilling terminates to withdraw backward, the extendable bracket 7 of expansion is restricted by aperture and is forced along 8 reverse slide of rail plate, from
And expanded angle is gradually reduced and is received into card slot 5, to realize that reamer piece 4 is received into again in card slot 5.
The Counterboring apparatus of one according to the present invention further non-limiting embodiment, wherein card slot 5 is 2~5,
It may be, for example, but be not limited to 3, this, which is those skilled in the art, to be selected according to needs of production.Card slot 5 can be with
It is arranged at a certain distance from apart from drill bit.
The Counterboring apparatus of one according to the present invention further non-limiting embodiment, wherein when reamer piece is from card
When slot 5 is unfolded, deployment diameter is 3~7 times of original state diameter, may be, for example, but is not limited to 5 times, this is people in the art
Member can select according to needs of production.
The Counterboring apparatus of one according to the present invention further non-limiting embodiment, wherein reamer piece and drillstock
Articulated connection, certain those skilled in the art will also be appreciated that and use other any other suitable mounting means.
The Counterboring apparatus of one according to the present invention further non-limiting embodiment, wherein normal drill bit is a diameter of
50~70mm may be, for example, but be not limited to Φ 65mm, this, which is those skilled in the art, to be selected according to needs of production
's.
According to the Counterboring apparatus of the further non-limiting embodiment of the present invention, wherein reamer piece closes for high temperature
Made of golden material, high temperature alloy is such as wolfram steel, titanium alloy, titanium-aluminium alloy, nickel-base alloy or any other intensity, wearability
With heat-resisting quantity, high-temperature oxidation suitable material.
It is that reaming is carried out in thin coal pillar to gob side entry driving thin coal pillar using Counterboring apparatus as described above as shown in Figure 1
It is that swollen locking-type two-ended cables play a role and are formed by the shape in hole when providing space in 1, as shown in Figure 1, the shape in thin coal pillar 1
At drilling 2 and enlarged footing 3, work progress includes the following steps：
Step (1)：The normal drill bit is installed on the drillstock, using the normal drill bit, such as passes through drilling machine
The Counterboring apparatus is driven, is drilled, until stopping drilling after reaching the position for needing enlarged footing, extracts the reaming dress
It sets；
Step (2)：From the normal drill bit under drillstock dismounting and it is changed to the reaming bit, by the reamer
Head is sent into drilling, and is pushed into the bottom hole of the drilling；
Step (3)：It after reaming bit is pushed to the bottom hole, pushes away further along with strength, is set to the reaming bit
On the navigation button contact and be pressed with coal wall, the reamer piece is unfolded from the card slot immediately, and starts to cut
Coal wall is cut, pushes ahead to form cylindrical space；
Step (4)：After completing reaming, by the aperture that the normal drill bit drills out, drilling machine drives the drillstock reversely to revolve
Turn, the reamer piece reset is accommodated in the card slot, to take out the reaming bit.
Wherein, need bore major part position be away from 3000~4000mm of thin coal pillar surface at, such as, but not limited to 3600mm,
This can be appropriately selected depending on the swollen locking-type two-ended cables joined together used, i.e., the distance is substantially with swollen locking-type to wearing
Anchor cable de-swelling tapered end is identical with the length except the length for wearing anchor cable.Such as when the length of swollen locking-type two-ended cables is
The length of 4300mm, swollen tapered end are 400mm, stay the length of 300mm to be used for drawing in construction side, residue length 3600mm
When, which is 3600mm.
Expansion bore piece push ahead distance be 300~500mm, can be but be not limited to 400mm, i.e., the distance substantially with swollen lock
The length of head is identical.It is formed by a diameter of 250~350mm of cylindrical space, such as, but not limited to diameter 300mm, it is long
Degree is identical as advance distance, this depends on length and diameter when expansion brill piece is fully deployed.
The foregoing is merely presently preferred embodiments of the present invention, practical range not for the purpose of limiting the invention；If do not taken off
It from the spirit and scope of the present invention, modifies or equivalently replaces the present invention, should all cover in the claims in the present invention
In protection domain.
Claims (10)
1. a kind of gob side entry driving thin coal pillar strengthening construction Counterboring apparatus, which is characterized in that the reaming device includes drillstock
With the drill bit being removably installed on the drillstock；
It is provided with the card slot being evenly arranged along the circumferencial direction of the drillstock on the drillstock, expansion is installed in the card slot
Hole drill piece；
The drill bit is normal drill bit or reaming bit.
2. Counterboring apparatus according to claim 1, which is characterized in that the reaming bit front end is provided with for controlling
The reamer piece is unfolded from the card slot or is closed the navigation button being accommodated in the card slot, wherein described fixed when pressing
When the button of position, the reamer piece is unfolded from the card slot.
3. Counterboring apparatus according to claim 1 or 2, which is characterized in that the original state diameter of the reaming bit with
The diameter of the normal drill bit is identical.
4. reaming bit according to claim 1 or 2, which is characterized in that the card slot is 2~5.
5. Counterboring apparatus according to claim 3, which is characterized in that when the reamer piece is unfolded from the card slot,
Deployment diameter is 3~7 times of the original state diameter.
6. Counterboring apparatus according to claim 1 or 2, which is characterized in that the reamer piece hingedly connects with the drillstock
It connects.
7. Counterboring apparatus according to claim 1 or 2, which is characterized in that a diameter of 50~70mm of normal drill bit.
8. Counterboring apparatus according to claim 1 or 2, which is characterized in that the reamer piece is high-temperature alloy material system
At.
9. the side of strengthening construction is carried out to gob side entry driving thin coal pillar using any one of them Counterboring apparatus of claim 1~8
Method, which is characterized in that include the following steps：
Step (1)：Normal drill bit is installed on the drillstock of the Counterboring apparatus, is drilled using the normal drill bit, directly
Stop drilling after needing the position of enlarged footing to arrival, extracts the Counterboring apparatus；
Step (2)：From the normal drill bit under drillstock dismounting and it is changed to the reaming bit, the reaming bit is sent
Enter in drilling, and is pushed into the bottom hole of the drilling；
Step (3)：It after the reaming bit is pushed to the bottom hole, pushes away further along with strength, is set to the reaming bit
On navigation button contact and be pressed with coal wall, the reamer piece is unfolded from the card slot on the drillstock immediately, and
Start to cut coal wall, pushes ahead to form cylindrical space；
Step (4)：After completing reaming, by the aperture that the normal drill bit drills out, the drillstock reversely rotates, the reamer
Piece reset is accommodated in the card slot, to take out the reaming bit.
10. according to the method described in claim 9, it is characterized in that, the position for needing to bore major part is away from thin coal pillar surface 3000
At~4000mm, it is 300~500mm that the expansion, which bores piece and pushes ahead distance, the cylindrical space a diameter of 250~
350mm, length are identical as the advance distance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810580214.9A CN108756758A (en) | 2018-06-07 | 2018-06-07 | A kind of gob side entry driving thin coal pillar strengthening construction Counterboring apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810580214.9A CN108756758A (en) | 2018-06-07 | 2018-06-07 | A kind of gob side entry driving thin coal pillar strengthening construction Counterboring apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108756758A true CN108756758A (en) | 2018-11-06 |
Family
ID=63999361
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810580214.9A Pending CN108756758A (en) | 2018-06-07 | 2018-06-07 | A kind of gob side entry driving thin coal pillar strengthening construction Counterboring apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108756758A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110374510A (en) * | 2019-07-09 | 2019-10-25 | 北京市政路桥股份有限公司 | A kind of deep hole grouting cutting type reaming bit device and construction method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1523197A (en) * | 2003-05-09 | 2004-08-25 | 陆观宏 | Drill expanding aiguille of anchor shaft, anchor cable, stake and drill expanding technology |
| CN101315021A (en) * | 2007-05-29 | 2008-12-03 | 煤炭科学研究总院 | Automatic reducing borehole-enlarging drilling tool |
| CN103758552A (en) * | 2014-01-27 | 2014-04-30 | 北方工业大学 | Hole-expanding anchor rod and construction process thereof |
| CN103982138A (en) * | 2014-05-30 | 2014-08-13 | 无锡市安迈工程机械有限公司 | Automatic expanding drill for drilling machine |
| US20140338976A1 (en) * | 2008-05-05 | 2014-11-20 | Weatherford/Lamb, Inc. | Extendable cutting tools for use in a wellbore |
| CN204703769U (en) * | 2015-05-28 | 2015-10-14 | 深圳市盛业地下工程有限公司 | Borehole-enlarging drilling tool |
-
2018
- 2018-06-07 CN CN201810580214.9A patent/CN108756758A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1523197A (en) * | 2003-05-09 | 2004-08-25 | 陆观宏 | Drill expanding aiguille of anchor shaft, anchor cable, stake and drill expanding technology |
| CN101315021A (en) * | 2007-05-29 | 2008-12-03 | 煤炭科学研究总院 | Automatic reducing borehole-enlarging drilling tool |
| US20140338976A1 (en) * | 2008-05-05 | 2014-11-20 | Weatherford/Lamb, Inc. | Extendable cutting tools for use in a wellbore |
| CN103758552A (en) * | 2014-01-27 | 2014-04-30 | 北方工业大学 | Hole-expanding anchor rod and construction process thereof |
| CN103982138A (en) * | 2014-05-30 | 2014-08-13 | 无锡市安迈工程机械有限公司 | Automatic expanding drill for drilling machine |
| CN204703769U (en) * | 2015-05-28 | 2015-10-14 | 深圳市盛业地下工程有限公司 | Borehole-enlarging drilling tool |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110374510A (en) * | 2019-07-09 | 2019-10-25 | 北京市政路桥股份有限公司 | A kind of deep hole grouting cutting type reaming bit device and construction method |
| CN110374510B (en) * | 2019-07-09 | 2024-05-14 | 北京市政路桥股份有限公司 | Deep hole grouting cutting type reaming bit device and construction method |
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| PB01 | Publication | ||
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Application publication date: 20181106 |