CN111042822B - Extremely-close coal seam goaf down-cut roadway construction method - Google Patents
Extremely-close coal seam goaf down-cut roadway construction method Download PDFInfo
- Publication number
- CN111042822B CN111042822B CN201911270147.1A CN201911270147A CN111042822B CN 111042822 B CN111042822 B CN 111042822B CN 201911270147 A CN201911270147 A CN 201911270147A CN 111042822 B CN111042822 B CN 111042822B
- Authority
- CN
- China
- Prior art keywords
- section
- machine
- roadway
- double
- construction
- 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.)
- Active
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/006—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries by making use of blasting methods
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/006—Lining anchored in the rock
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/15—Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
- E21D11/152—Laggings made of grids or nettings
Abstract
The invention relates to the technical field of coal mining, in particular to a construction method for a lower cutting roadway of a very close coal seam goaf; the method comprises the following steps: a. a reference small-section blasting and digging machine nest; b. carrying out slope expansion on the machine nest, carrying out large-section machine nest blasting excavation slope expansion construction, and adopting full-section four-leg double-beam shed construction; c. carrying out small-section machine excavation through construction; d. c, after the small-section machine-tunneling run-through construction is finished, carrying out large-section main roadway machine-tunneling side-expanding construction by adopting staggered arrangement with the small-section double-leg double-beam shed; by utilizing the machine-driven main roadway and the slope expanding technology, the vibration influence of blasting excavation on the top plate is avoided, and the difficult problem of roadway construction in the extremely close goaf is successfully solved. A full-section four-leg double-beam shed supporting technology is utilized to support a tunnel machine nest section, so that an operation space is provided for a tunneling machine set and a rubber belt conveyor; the technology of erecting a full-section roadway by using the cross arrangement of the small-section four-leg double-beam shed and the double-leg single-beam shed avoids the difficult problems of long beam and difficult erection of the full-section four-leg double-beam shed.
Description
Technical Field
The invention relates to the technical field of coal mining, in particular to a construction method for a down-cut roadway of a very close coal seam goaf.
Background
When the coal face is covered with goaf influence and the interlayer spacing is small, the top plate is influenced by roadway cutting construction operation, the vibration influence of blasting excavation on the top plate is caused, meanwhile, the operation space of a tunneling machine set is small, and safe roadway cutting under the goaf of the coal seam in a very short distance is a difficult problem.
Disclosure of Invention
The invention provides a construction method for an extremely-close coal seam goaf undercut lane, which aims to solve the difficult problem of safe construction of the extremely-close coal seam goaf undercut lane.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a construction method for an extremely-close coal seam goaf lower cutting roadway comprises the following steps:
a. the method comprises the following steps of (1) digging a small-section blasting machine pit, drilling a tunnel by adopting a handheld pneumatic coal drill and a pneumatic rock drill, constructing by a manual charging blasting method, digging the tunnel along a coal seam roof, and strictly controlling the height of the tunnel;
b. b, large-section machine-nest blasting excavation and slope expansion construction, wherein in the step a, after the small-section blasting excavation machine-nest tunneling is completed, original short beams are replaced, and full-section four-leg double-beam shed construction is adopted;
c. after the large-section machine nest is completed, a front roadway is tunneled according to a small section, an EBZ-230 tunneling machine is adopted for cutting and loading, a rubber belt conveyor is matched for conveying coal, and an MQT series pneumatic drilling machine is adopted for driving and loading a top anchor rod and an anchor cable;
d. and c, after the small section of the front roadway is communicated, the unit moves back to a machine nest, the large-section front roadway is subjected to machine excavation and side expansion construction, and steel sheds are erected in a staggered mode with the small-section double-leg double-beam shed.
Further, the roof support in the above steps adopts a four-hole steel belt which is lapped with the steel belt of the excavated roadway, is matched with a deformed steel anchor rod and a metal mesh sheet to jointly and actively support the roof, and then is crossed with the double-leg double-beam steel shed of the excavated roadway to erect a single-leg single-beam steel shed, stop a roof back side and passively support the double support of the roof.
Further, the top plate support in the above steps is a roadway with a 4.2m wide section, each row supports 4 anchor rods, the row spacing is not more than 700 x 900mm, the anchor rods are matched with small 120 x 120mm pads and machine-made nuts to be screwed, the exposed length of the anchor rods is 10-50mm, the hole depth is 1.68-1.71 m, each anchor rod uses not less than two resins, full-length anchoring is realized as far as possible, the pre-tightening force requirement of the anchor rods reaches 200 N.m, and the anchoring force is not less than 110 KN;
and meanwhile, I-steel double-leg and double-beam steel sheds and U-shaped three-clamp combined supports are adopted, the whole steel sheds are in trapezoidal arrangement, and active and passive double supports are carried out on the roadway.
Furthermore, in the blasting operation of the step a, the loading of each eye is 200g, and the eye depth is 1.5 m.
Compared with the prior art, the invention has the following beneficial effects:
1. by utilizing the machine-driven main roadway and the slope expanding technology, the vibration influence of blasting excavation on the top plate is avoided, and the difficult problem of roadway construction in the extremely close goaf is successfully solved.
2. The heading machine nest is smoothly constructed by utilizing the technology of drilling shallow holes, filling less powder and blasting by putting small guns, so that the vibration influence on the top plate is avoided as much as possible, and the problem of smooth construction of the heading machine nest is successfully solved.
3. The full-section four-leg double-beam shed supporting technology is used for supporting the nest section of the tunnel machine, so that an operation space is provided for a tunneling machine set and a rubber belt conveyor, and the flexibility of single columns is utilized to realize the entry of the whole machine and the efficient operation of one-step stable equipment.
4. The technology of erecting a full-section roadway by using the cross arrangement of the small-section four-leg double-beam shed and the double-leg single-beam shed avoids the difficult problems of long beam and difficult erection of the full-section four-leg double-beam shed.
Detailed Description
The present invention is further illustrated by the following specific examples.
Example 1
In this embodiment, the cloud gang mine of the university coal mine group, llc, is taken as an example:
81001 cut lane at 12-2#A layer 410 disc area with the length of 132 meters and the specification of 6.2m multiplied by 2.8m is designed, the coal seam in the area is tunneled from the northeast to the southwest direction at the direction of 265 degrees 10', the thickness of the coal seam in the area is 2.5-3.2 meters, the average thickness is 2.8 meters, and the local part of the coal seam contains 1-2 layers of stones with the thickness of 0.1-0.5 m; the direct roof is gray powder fine sandstone with the thickness of 0.7-10.0 m and the average thickness of 5.5 m; the direct bottom is dark gray siltstone with the thickness of about 0.7 m.
The working surface area is covered with the ground, the north is high and the south is low, the working surface area is positioned in the south of the great south village, an east-west small road and an east-west power line are distributed in the middle, the north valley is vertical and horizontal, and the south is a relatively flat dry land and has a plurality of steep ridges. The ground elevation is 1266m-1317 m.
Downhole in 410 disc zone 12-2＃The layer, the north part is 21001 lane and 51001 lane, the west part is 81003 working face (mining), the east part is 410-1 rail, skin, three dish district lanes back, the south part is not exploited.
The working surface is covered with 3#Layer, 8#Layer, 12#And (3) a layer. 12-2#Coal seam and overburden 3#The coal seam interval is 128m on average and 8 overlying coal seams#The coal seam interval is 74m and 12 m on average-2#The layer 81001 is a very close coal seam working face and is covered with 12#The interval of coal layers is 1.8-2.3 m (from bottom to top: 0.8 m stone, about 0.4 m coal-rock interbed, 1.1 m coal); and the 81001 lane cutting is just below the overlying 81035 goaf, and the interlayer spacing is only about 2 m. 12-2#Layer 410 disc area 81001 cut lane arranged at 12-2#In the coal seam, the working face is marked with the height of 1002-1020m, the design length of 132m and the azimuth angle of 265-10'. The roadway specification is width × height =6.2m × 2.8 m.
The following construction process is adopted to ensure the normal operation of the tunneling work:
a. the small-section blasting 30-meter machine pit has the advantages that because the spacing between the cut roadway layers is small, in order to reduce the vibration influence of the blasting process on the top plate, the roadway adopts a mechanical excavation construction process; however, the construction of the heading machine needs to be carried out in advance, so that the heading machine is used for blasting and digging a 30-meter heading machine pit with a small section by taking a cut roadway south side as a reference. The roof support adopts a four-hole steel belt lap joint matched threaded steel anchor rod and metal net sheet combined active roof support, and adopts double support of a four-leg double-beam steel shed, a stop roof back side and a passive roof support.
b. The large-section machine-nest blasting excavation and slope expansion construction needs blasting excavation and slope expansion construction in the machine-nest section because the section is small and the front roadway slope expansion needs a machine-digging unit for construction. In order to ensure the normal operation of the belt head at the position of the machine nest, the four-leg double-beam shed at the section of the machine nest needs to be replaced by a full-section four-leg double-beam shed.
c. And (3) performing small-section machine tunneling through construction, after the blasting tunneling machine nest tunneling is completed, performing cutting and loading on the front roadway tunneling by adopting an EBZ-230 tunneling machine, matching a rubber belt conveyor to transport coal, and drilling and installing top anchor rods and anchor cables by adopting an MQT series pneumatic drilling machine. The top plate support adopts a four-hole steel belt matched with a deformed steel bar anchor rod and a metal mesh to jointly and actively support the top plate, and adopts double support of a four-leg double-beam steel shed, a stop top back side and a passive support top plate.
d. And (3) carrying out machine excavation and slope expansion construction on the large-section main roadway, withdrawing the tunneling machine set to a machine pit after completing the cut roadway small-section through construction, and carrying out machine excavation construction on the main roadway slope expansion. Because the span of the full-section four-leg double-beam shed is too large, shed legs need to be supported in the middle, but the number of units and other equipment in a front lane is large, and the full-section four-leg double-beam shed cannot be constructed, the small-section four-leg double-beam shed and the double-leg single-beam shed are arranged in a staggered mode. The roof support adopts double support of lapping a four-hole steel belt and a excavated roadway steel belt, combining a deformed steel bar anchor rod and a metal mesh to actively support the roof, crossing with the excavated roadway four-leg double-beam steel shed to erect a double-leg single-beam steel shed, stopping the roof and the back side, and passively supporting the roof. The crossing length of the shed beams is reasonably utilized, and the middle shed legs are replaced by single columns, so that the stability of the steel shed is ensured, and meanwhile, a space is provided for the operation of the heading machine.
The concrete construction is as follows:
1. blasting and excavating construction requirements
The roadway driving is carried out by adopting a method of drilling by a hand-held pneumatic coal drill and a pneumatic rock drill and carrying out manual charging blasting. And (4) tunneling along the coal seam roof, strictly controlling the height of the tunnel, and strictly prohibiting the ultrahigh condition and the underheight condition.
1) The blasting operation needs to be performed with shallow holes, less explosive and small blast, the explosive loading of each hole is limited to 200g, and the depth of each hole is limited to 1.5 m.
2) Prior to opening, nearby pipeline equipment that may be endangered by the blast must be removed or covered to prevent damage from the blast.
3) And (3) the carrying angle of the intersection of the bisection lane is R = 4m, and the support density of a top plate at the intersection formed after the opening is increased to enable the top control distance to be not more than 0.7 m.
2. Construction requirements of machine excavation
And (3) cutting and loading the roadway by adopting an EBZ-230 heading machine, conveying coal by matching with a rubber belt conveyor, and driving and loading a top anchor rod and an anchor cable by adopting an MQT series pneumatic drill. And (4) tunneling along the coal seam roof, strictly controlling the height of the tunnel, and strictly prohibiting the ultrahigh condition and the underheight condition.
3. Permanent support construction requirements
The combined support of anchor rods, anchor cables, four-leg double-beam steel sheds, double-leg single-beam sheds and metal sheet nets is adopted.
The width section of the roadway is 4.2m, each row supports 4 anchor rods, the row spacing is not more than 700 x 900mm, the anchor rods are matched with small 120 x 120mm pads and machine-made nuts to be screwed, the exposed length of the anchor rods is 10-50mm, the hole depth is 1.68-1.71 m, each anchor rod must use not less than two resins, full-length anchoring is realized as far as possible, the pre-tightening force of the anchor rods is required to reach 200N · m, and the anchoring force is not less than 110 KN.
Meanwhile, I-steel four-leg double-beam steel sheds and U-shaped three-clamp combined supports are adopted, the whole steel sheds are in trapezoidal arrangement, and active and passive double supports are carried out on the roadway.
For the stability of reinforcing steel canopy, prevent that the steel canopy from empting and hindering the people occurence of failure, add through anchor rope and splint and beat 2U type checkposts altogether to the canopy roof beam after the frame canopy and consolidate. The anchor cable mainly plays a role of suspending the shed beam and is not used as a permanent support.
Before blasting, the minimum distance of controlled top is not greater than one row distance of anchor rod, after blasting, the maximum distance of controlled top is not greater than one row distance of anchor rod plus one cycle footage, and overriding top operation is strictly forbidden. After blasting, the anchor bolt support must be followed to the working face in time, and the next shift is strictly forbidden to leave empty roof.
When the working face is temporarily stopped for a reason, the anchor bolt support closely follows the working face, and the top control distance is zero.
The application of the technology successfully delineating the Yuokang mine by 12-2#The layer 410 disc area 81001 working face is 132m long, the trend is 465m long, and the storage capacity is 16.5 ten thousand tons, thereby laying a foundation for effectively extracting the coal quantity of the working face.
And (3) extracting 16.5 million tons of coal, calculating according to the income of 100 yuan per ton, wherein the income of the working face is 1650 ten thousand yuan, the cost of removing roadway tunneling and the like is 138 ten thousand yuan, and the income is 1512 ten thousand yuan.
Claims (4)
1. A construction method for an extremely-close coal seam goaf lower cutting roadway is characterized by comprising the following steps:
a. the method comprises the following steps of (1) digging a small-section blasting machine pit, drilling a tunnel by adopting a handheld pneumatic coal drill and a pneumatic rock drill, constructing by a manual charging blasting method, digging the tunnel along a coal seam roof, and strictly controlling the height of the tunnel;
b. b, large-section machine-nest blasting excavation and slope expansion construction, wherein in the step a, after the small-section blasting excavation machine-nest tunneling is completed, short beams are replaced, and full-section four-leg double-beam shed construction is adopted;
c. after the large-section machine nest is completed, a front roadway is tunneled according to a small section, an EBZ-230 tunneling machine is adopted for cutting and loading, a rubber belt conveyor is matched for conveying coal, and an MQT series pneumatic drilling machine is adopted for driving and loading a top anchor rod and an anchor cable;
d. and c, after the small-section cut roadway of the front roadway is communicated, the unit moves back to a machine nest, the large-section front roadway is constructed by machine excavation and side expansion, and construction is carried out by adopting staggered arrangement with the small-section double-leg double-beam shed.
2. The method for constructing the underground cutting roadway of the very close coal seam goaf as claimed in claim 1, wherein the roof support in step d is a double support of overlapping a four-hole steel belt with the steel belt of the excavated roadway, actively supporting the roof by matching with a screw steel anchor rod and a metal mesh, and then cross-erecting a double-leg single-beam steel shed with the double-leg double-beam steel shed of the excavated roadway, braking a roof back side, and passively supporting the roof.
3. The extremely close coal seam gob down-cut roadway construction method according to claim 2, characterized in that the roof support in step d is roadway small section width 4.2m, each row supports 4 anchor rods, the row spacing is not more than 700 x 900mm, the anchor rods are screwed with small 120 x 120mm pads and machine-made nuts, the exposed length of the anchor rods is 10-50mm, the hole depth is 1.68-1.71 m, each anchor rod uses not less than two resins, the anchor rod pretightening force is required to reach 200N · m, and the anchoring force is not less than 110 KN;
and meanwhile, I-steel double-leg and double-beam steel sheds and U-shaped three-clamp combined supports are adopted, the whole steel sheds are in trapezoidal arrangement, and active and passive double supports are carried out on the roadway.
4. The method for constructing an undercut of a goaf in a very close coal seam according to claim 1, wherein the blasting operation in step a is limited to 200g per eye and the eye depth is limited to 1.5 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911270147.1A CN111042822B (en) | 2019-12-12 | 2019-12-12 | Extremely-close coal seam goaf down-cut roadway construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911270147.1A CN111042822B (en) | 2019-12-12 | 2019-12-12 | Extremely-close coal seam goaf down-cut roadway construction method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111042822A CN111042822A (en) | 2020-04-21 |
| CN111042822B true CN111042822B (en) | 2022-04-19 |
Family
ID=70235811
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911270147.1A Active CN111042822B (en) | 2019-12-12 | 2019-12-12 | Extremely-close coal seam goaf down-cut roadway construction method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111042822B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111779509A (en) * | 2020-07-10 | 2020-10-16 | 山西新景矿煤业有限责任公司 | Construction and support method for secondary roadway formation by cutting holes in small-interval intervals under goaf |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102425438A (en) * | 2011-11-21 | 2012-04-25 | 大同煤矿集团有限责任公司 | Supporting method of laneway under multiple goafs in ultra-close coal seam group |
| CN105564883A (en) * | 2015-12-30 | 2016-05-11 | 大同煤矿集团有限责任公司 | Short-section belt conveyer |
-
2019
- 2019-12-12 CN CN201911270147.1A patent/CN111042822B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102425438A (en) * | 2011-11-21 | 2012-04-25 | 大同煤矿集团有限责任公司 | Supporting method of laneway under multiple goafs in ultra-close coal seam group |
| CN105564883A (en) * | 2015-12-30 | 2016-05-11 | 大同煤矿集团有限责任公司 | Short-section belt conveyer |
Non-Patent Citations (3)
| Title |
|---|
| 极近距离煤层采空下大断面一次成巷技术;次全军等;《内蒙古煤炭经济》;20040515(第03期);第51-53页 * |
| 综放工作面大切巷的施工与支护;刘敬才;《煤矿开采》;20060330(第05期);第38，49页 * |
| 近距离煤层下分层工作面大断面切巷支护技术研究与应用;李成渺;《能源技术与管理》;20190831;第44卷(第4期);第120，121，160页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111042822A (en) | 2020-04-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104763425B (en) | Pressure relief presplitting blasting gob-side entry retaining pillar-free mining method | |
| CN108087008B (en) | A kind of three-soft seam gob side entry method for protecting support | |
| CN102953732A (en) | Room-and-pillar major-diameter longhole inverted-step-like segmented lateral caving subsequent filling mining method | |
| CN103397905A (en) | System and method for achieving natural striding, falling and filling of coal beds, flexible roadway protection and complete gob-side entry retaining | |
| CN105971606A (en) | Extremely-thick coal seam longwall working face mining method | |
| CN102900449B (en) | Support method for underground goaf roof of coal mine | |
| CN110645018B (en) | Mine underground strong dynamic pressure roadway prestress anchor-charging integrated supporting structure and method | |
| CN101302933A (en) | Method for developing rock lane comprehensive mechanization developing operation | |
| CN109707422B (en) | High-pressure grouting reinforcing and supporting method for small coal pillars along empty conveying roadway | |
| CN111042822B (en) | Extremely-close coal seam goaf down-cut roadway construction method | |
| CN102383795B (en) | Comprehensive mechanical rock drift excavating process | |
| CN110118085A (en) | A kind of compound advanced secondary tunneling method in two lane of top working face of large mining depth high working face | |
| CN113605893A (en) | Control method for pre-filled completely gob-side entry driving surrounding rock | |
| CN109296368A (en) | Stepped upward horizontal layered cemented filling mining method | |
| CN104265294A (en) | Coal pillar-free mining technology for blasting mining face of steeply dipping seam | |
| Yang et al. | Research on the technology of small coal pillars of gob-side entry retained in deep mines based on the roof cutting for pressure unloading in the lower key stratum | |
| CN114087016B (en) | Caving-to-filling mining isolation top column pre-control supporting method | |
| CN102425417A (en) | Anchor cable and rough wall combined method for gob-side entry retaining stage under collapsible roof | |
| CN210152690U (en) | Fully-mechanized top coal caving working face roadway arrangement and support device along bottom plate rock stratum | |
| CN100494628C (en) | Comprehensive coal mining method | |
| CN206280089U (en) | Large-inclination-angle coal bed big gun is adopted and turns fully mechanized mining open-off cut supporting facility | |
| Korski | Temporary mechanized gate roof support in the YapiTec mine | |
| CN108979687A (en) | A kind of underground coal mine uses the advancing mining method of goaf top plate supporting | |
| CN114060032B (en) | Mining method for reserving protective coal pillar on steep-dip extra-thick coal seam | |
| CN204175307U (en) | Large-inclination-angle coal bed working face is without coal pillar mining supporting facility |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 037003 xinpingwang mining area, Datong City, Shanxi Province Applicant after: Jinneng holding Coal Group Co.,Ltd. Address before: 037003 Wangxiao North Street, Xinping, Datong City, Shanxi Province Applicant before: Datong Coal Mine Group Co.,Ltd. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |