CN105756700A - Construction method and hole sealing structure for super-large section tunnel for traversing coal measure strata section - Google Patents
Construction method and hole sealing structure for super-large section tunnel for traversing coal measure strata section Download PDFInfo
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- CN105756700A CN105756700A CN201610139185.3A CN201610139185A CN105756700A CN 105756700 A CN105756700 A CN 105756700A CN 201610139185 A CN201610139185 A CN 201610139185A CN 105756700 A CN105756700 A CN 105756700A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/006—Production of coal-bed methane
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
Abstract
The invention discloses a construction method and a hole sealing structure for a super-large section tunnel for traversing a coal measure strata section. The method comprises a hydraulic fracturing step and a gas extracting step, wherein the hydraulic fracturing step comprises the following processes: carrying out concentrated fracturing on a plurality of fracturing holes in sequence by fracturing units arranged in the same region, determining the concentrating frequency for concentrated fracturing of the coal measure strata section, at least two to-be-traversed coal seams for primary concentrated fracturing before fracturing, a gas outburst seam and the drilling position and depth of primary concentrated fracturing; and the gas extracting step comprises concentrated extraction of more than two coal seams and individual extraction of a to-be-excavated coal seam. The hole sealing structure is formed through a hole sealing device; a floral tube section is formed at the inner end of a fracturing tube of the hole sealing device and is divided into an inner section of the floral tube and an outer section of the floral tube; at least one gauze is wound on the outer wall of the outer section of the floral tube; and a hole sealing section comprises a cement paste solidifying section and a polyurethane sealing section. The construction method and the hole sealing structure have the beneficial effects that the condition that the tunnel quickly and safely passes through the coal measure strata section can be ensured by a tunneling method; and the hole sealing structure is good in hole sealing effect and high in loading capacity.
Description
Technical field
The present invention relates to a kind of super large end face tunnel piercing technology, particularly a kind of large section tunnel and wear the construction method of coal measure strata section and for the fracturing drilling and sealing structure in the method.
Background technology
Along with the development of China's communication, the situation containing build tunnel, gas stratum of passing through gets more and more, and high methane tunnel quantity is also being continuously increased.Although the gas tunnel of current domestic construction is many based on high methane, but there is Gas Outburst, have the less of Gas Outburst phenomenon, be generally adopted the way of conventional coal mine roadway driving, construction speed is low, and the duration is longer.According to incompletely statistics, the domestic coal that includes has ear vcehicular tunnel, a Wumeng Shan Mountain railway tunnel etc. with the prominent dangerous tunnel of gas, but does not form a set of process about the prominent constructing tunnel of coal and gas completely, and external gas tunnel construction referential experience is less.For this reason, it may be necessary to a kind of safe, construction technology quickly through coal measure strata section.
Summary of the invention
The first object of the present invention is for the deficiencies in the prior art, a kind of large section tunnel is provided to wear the construction method of coal measure strata section, by the mode of pressure break once being concentrated repeatedly in multiple coal seams at the same area, reduce fracturing unit transfer number, substantially reduce pressure break preparation amount, thus improving tunnel boring efficiency, for laying good basis quickly through coal measure strata section；And by from treating that the distance that pick coal seam at least two sets carries out gas pumping and the judgement of safety driving, it is ensured that tunnel piercing safety.The second object of the present invention is to provide a kind of large section tunnel and passes through the concentration fracturing drilling and sealing structure of multiple seam, form the pressure break boring of this hole sealing structure, its sealing of hole speed is fast, sealing of hole firm, good sealing effect, can facilitate, realize reliably concentrating fracturing, it is beneficial to raising tunnel boring efficiency, for providing reliable guarantee quickly through coal measure strata section.
For realizing the first purpose, the present invention adopts the following technical scheme that
A kind of large section tunnel wears the construction method of coal measure strata section, including the step of fracturing and gas pumping,
Described fracturing adopts the Frac unit being laid in tunnel the same area to carry out multiple pressure break holes successively concentrating pressure break, before pressure break, data is surveyed on ground according to coal measure strata section to be traversed, determine that coal measure strata section concentrates the number of times of concentrating of pressure break once to concentrate at least two coal seam to be traversed of pressure break, and at the first setpoint distance place in the to be traversed first coal seam once concentrating fracturing, coal seam to be traversed is carried out essence spy, exposed coal layer thickness and the accurate parameter of adjacent coal bed spacing is respectively treated to obtain, and respectively treat the Methane Diffusion speed of exposed coal layer and the Gas Outburst parameter of pressure；Determine Coal Seam Prone To Outburst according to Gas Outburst parameter and once concentrate pressure break bore position and the degree of depth of fracturing, and brill and sealing of hole are executed in pressure break boring；
Described gas pumping includes the concentration extraction after fracturing to two or more coal seam, and at the second setpoint distance place of tunnel piercing to arbitrary coal seam to the independent extraction treating pick coal seam by digging.
Adopt the present invention of technique scheme, by the mode of pressure break once being concentrated repeatedly in multiple coal seams at the same area, reduce fracturing unit transfer number, substantially reduce pressure break preparation amount, thus improving tunnel boring efficiency, for laying good basis quickly through coal measure strata section；And by from treating that the distance that pick coal seam at least two sets carries out gas pumping and the judgement of safety driving, it is ensured that tunnel piercing safety.
Preferably, described independent extraction be additionally included in tunnel piercing to from by digging treat pick coal seam the 3rd setpoint distance place carry out.Improve the safety of tunnel piercing further.
It is further preferred that described 3rd setpoint distance is 2.5～3.5m.Improve the reliability of driving safety further.
Preferably, after described gas pumping, also include Gas Outburst parameter detecting, to judge whether tunnel can carry out safe driving；It is then continue driving；No, then continue extraction, and again judge whether tunnel can carry out safe driving by Gas Outburst parameter detecting.Use for reference Gas Outburst criterion and the method for Gas-bearing Coal Seams exploitation in the perspiration of colliery, it is ensured that the safety of driving.
Preferably, it is additionally included in tunnel piercing to coal seam when opening, the concordant coal seam prediction boring of construction Gas Outburst parameter prediction in coal seam, predict that boring carries out the prominent parameter prediction of coal-bed gas by concordant coal seam, and judge whether tunnel can carry out safe coal-openning, it is then continue exposed coal to passing through this coal seam；No, then carry out gas pumping, and again carry out the prominent parameter prediction of coal-bed gas and whether can carry out safe coal-openning judgement.Again to carry out tunneling judgement safely after opening coal seam, it is ensured that tunnel safety in the tunneling process of coal seam.
Preferably, described first setpoint distance is 10～12m；Described second setpoint distance place is 5～6m.To obtain the accurate data of coal seam thickness and Gas Outburst, tunnel piercing does not safely provide guarantee.
Preferably, in described multiple pressure break holes, the sealing of hole section of at least one has the part in the coal seam passed through.Target coal seam to be carried out when pressure break pressure break, and guarantee once to concentrate at least two target coal seam are carried out gradation pressure, reduce and concentrate number of times and pressure break preparation amount, improve tunnel boring efficiency.
Preferably, in the tunneling process of described Tunnel Passing coal measure strata section, also include the coal body to coal measure strata section and rock mass segmentation carries out advance support process, this advance support includes entering steel pipe at the coal and rock embedded in hole of coal measure strata section, adopt cement grout to consolidate, in multiple steel pipes setting regions outside the outline excavation control line of middle and upper part, tunnel and lateral wall, form canopy formula advance support structure.To prevent rock mass or coal and rock in tunneling process from collapsing because of soft, further ensure that driving safety.
For realizing the second purpose, the present invention adopts the following technical scheme that.
A kind of large section tunnel passes through the concentration fracturing drilling and sealing structure of multiple seam, hole including with the multiple pressure breaks once concentrating pressure break number of times correspondent equal, it is correspondingly arranged a hole sealing device in the boring of each pressure break, and form hole sealing structure by corresponding hole sealing device, hole sealing device is stretched into corresponding coal seam by roof direction, hole sealing device includes pressure break pipe, grout pipe, pressure break pipe inner end is formed with the floral tube section of preseting length, the tie part that floral tube section starches structure by horsetail form drag is separated in floral tube section and the outer section of floral tube, in floral tube, section is used for fracturing water outlet, the outer wall of the outer section of floral tube is wound with at least one of which gauze；Horsetail form drag slurry structure passes through the cotton yarn or the formation of fabric bar that are banded on pressure break pipe, and is positioned at roof, and sealing of hole section is made up of grout cures section and polyurethane seal section.
Adopting the hole sealing structure of preceding solution, it may be achieved the once concentration gradation pressure break in multiple coal seams, form the hole sealing device simple in construction of hole sealing structure, sealing of hole is convenient, and sealing of hole section good sealing effect, bearing capacity is strong.Wherein, in floral tube, section is used for frac water water outlet, and the outer section of floral tube section is for cement mortar dewatering；Horsetail and gauze have permeable and resistance sand effect, are beneficial to and stop in coal seam and the pressure break pipe that cement mortar flows to boring inner end, and are conducive to the cement mortar near horsetail and the outer section of floral tube to accelerate to solidify.When hole sealing device inserts boring, it is desirable to pressure break pipe and grout pipe are fixed together by fixtures such as pipe clamps, to improve the convenience of operation.Meanwhile, utilizing the soft characteristic of gauze, section floral tube bore portion in floral tube can be filled and be formed stopple by water under high pressure mud, can improve the fastness combined between pressure break pipe and cement mortar seal section.
Preferably, described horsetail form drag slurry structure length at least 1 meter, the tie part place of pressure break pipe is welded with horsetail form drag slurry structure and ties up with multiple anti-skid studs or anti-slop serrations；The outer segment length at least 1 meter of described floral tube；Described polyurethane sealing of hole segment length at least 1.5 meters.The bearing capacity being not less than 35MPa to guarantee sealing of hole section to have.
The present invention compared with prior art provides the benefit that, driving method can ensure that tunnel piercing quickly, safety coal measure strata section；The sealing of hole of hole sealing structure is effective, bearing capacity is strong.
Accompanying drawing explanation
Fig. 1 is that application the inventive method carries out in tunnel piercing, the multiple digital well logging structural representations determined by exploration data in the coal measure strata that tunnel passes through.
Fig. 2 is the distribution schematic diagram once concentrating multiple pressure break hole in the inventive method.
Fig. 3 is advance support structural representation in the inventive method.
Fig. 4 is the structural representation of hole sealing structure of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is further illustrated, but does not therefore limit the present invention among described practical range.
Embodiment 1, a kind of large section tunnel wears the construction method of coal measure strata section, step including fracturing and gas pumping, the method for passing through the tunnel piercing in K1～K9 totally 9 coal seams in certain design, by K1～K9 digital well logging of geological exploration result and spacing, as it is shown in figure 1, wherein thickness and spacing units are m.
Data is surveyed on ground according to aforementioned coal measure strata section to be traversed, determine that 9 coal seams of coal measure strata section adopt the mode concentrating pressure break that multiple coal seams are carried out gradation pressure break twice, wherein, first time concentrates pressure break to K9～K4 coal seam, and second time concentrates pressure break that K3～K1 coal seam is carried out.
At tunnel excavation work surface to, during from K9 and K3 roof minimum perpendicular distance 10m, analyzing respectively through drill hole sampling and obtain K9～K1 coal seam average digital well logging respectively 0.94m, 0.82m, 0.71m, 0m, 2.60m, 1.65m, 0.1m, 1.21m, 0.35m；K9 and K8 coal seam spacing is 1.87m, K8 and K7 coal seam spacing be 2.41m, K7 and K5 coal seam spacing be 13.3m, K5 and K4 coal seam spacing be 0.7m, K4 and K3 coal seam spacing be 7.49m, K3 and K2 coal seam spacing be 25.72m, K2 and K1 coal seam spacing is 6.95m；Wherein, K6 coal seam thickness is 0, i.e. non-coal seam, and K3 coal seam thickness is 0.1 meter of thinning is that seam is negligible, and by all coal seams of traverse are sampled, adopts DGC rapid measurement device for gas content to measure the original gas bearing capacity in coal seam, inverse gas pressure；Adopt WFC-2 type gas diffusion initial speed automatic analyzer, smash cylinder to pieces, Δ P, f value is measured by hopper, sky equality instrument；And the Failure type in coal seam is analyzed by location of the coring procedure.To determine that whether work area, place is for Gas Outburst work area.With specific reference to the related request of " super-long railway tunnel technical specification ", as long as gas tunnel has a place to have outburst danger, the work area at this place, place is Gas Outburst work area.It is judged to that Gas Outburst must meet following 4 indexs simultaneously: (1) gas pressure P >=0.74MPa；(2) gas diffusion initial speed △ P >=10；(3) solid coefficient f≤0.5 of coal；(4) Failure type of coal be III class and more than.In judge process, owing to the gas pressure measurement cycle is longer, the requirement according to " preventing and treating coal and gas prominent specifies ", take actual measurement gas bearing capacity and industrialness to analyze the data such as result and carry out inverse gas pressure.Obtain K9, K5, K4 and K2 are projecting coal bed, and all the other are non-protruding coal seam.Then, determine that first time concentrates pressure break respectively to K9, K8, K7, K5, K4 coal bed fracturing, and creep into three pressure break holes respectively 1#, 2# and 3#, as shown in Figure 2,1# pressure break hole is drilled into K4 coal seam by K9 roof direction through K9, K8, K7, K5 coal seam, 2# pressure break hole is drilled into K5 coal seam by K9 roof direction through K9, K8, K7 coal seam, and 3# pressure break hole is drilled into K7 coal seam by K9 roof direction through K9 and K8 coal seam；Owing to K9 and K8 and K8 is less with K7 coal seam spacing, now, K9, K8 and K7 are considered as same coal seam.Crept into by the face of tunnel piercing by three the pressure break holes determined, carry out sealing of hole after having holed, wherein, 1# pressure break hole sealing of hole is to K4 roof, 2# pressure break hole sealing of hole is to K5 roof, and 3# pressure break hole sealing of hole is to K9 roof, and guarantees that the pressure-bearing of sealing of hole section is not less than 35MPa.
Gas pumping include after fracturing to K9, K8, four coal seams of K7, K5 and K4 concentration extraction, and in tunnel piercing to 5～6m place in arbitrary coal seam in from K9, K5 and K4 to the independent extraction treating pick coal seam by digging, wherein, independent extraction is additionally included in tunnel piercing to treating that from K9, K5 and the K4 by digging 2.5～3.5m place in pick coal seam carries out.Gas Outburst parameter detecting is also included, to judge whether tunnel can carry out safe driving after gas pumping；It is then continue driving；No, then continue extraction, and again judge whether tunnel can carry out safe driving by Gas Outburst parameter detecting.
When tunnel piercing to K9, K5 and K4 coal seam is opened, the concordant coal seam prediction boring of construction Gas Outburst parameter prediction in coal seam, predict that boring carries out the prominent parameter prediction of coal-bed gas by concordant coal seam, and judge whether tunnel can carry out safe coal-openning, it is then continue exposed coal to passing through this coal seam；No, then carry out gas pumping, and again carry out the prominent parameter prediction of coal-bed gas and whether can carry out safe coal-openning judgement.
As shown in Figure 3, in the tunneling process of described Tunnel Passing coal measure strata section, also include the coal body to coal measure strata section and rock mass segmentation carries out advance support process, this advance support includes being built into seamless steel pipe in the coal and rock boring 9 of coal measure strata section, cement grout is adopted to consolidate, it is interspersed by inside and outside two rows in multiple seamless steel pipes setting regions outside the outline excavation control line of middle and upper part, tunnel and lateral wall, and forms canopy formula advance support structure.And in this advance support, seamless steel pipe has, when meeting coal seam, the part passing coal seam at least 1.0m；9 diameters of holing are 89mm, and the latus rectum of seamless steel pipe is 50mm, and adjacent boring 9 spacing of same row is 0.6～0.8m, and the trestle column of two row hole drillings 9 is 0.25～0.40m.
Owing to K3 thinning is seam, K1 is non-protruding coal seam, therefore, it is anti-reflection that second time concentrates pressure break only to need that K2 coal seam is carried out pressure break, therefore, in tunnel piercing to when setting 10m from K2, construction pressure break is holed, and pressure break is anti-reflection after sealing of hole, and carry out concentrating extraction to K2 and K1 layer, carry out to the 5～6m place from K2 coal seam and 2.5～3.5m place in tunnel piercing, perform twice at gas pumping respectively, Gas Outburst parameter detecting is also included, to judge whether tunnel can carry out safe driving after gas pumping；It is then continue driving；No, then continue extraction, and again judge whether tunnel can carry out safe driving by Gas Outburst parameter detecting.
When tunnel piercing to K2 coal seam is opened, by concordant coal seam, the concordant coal seam prediction boring of construction Gas Outburst parameter prediction in coal seam, predicts that boring carries out the prominent parameter prediction of coal-bed gas, and judges whether tunnel can carry out safe coal-openning, it is then continue exposed coal to passing through this coal seam；No, then carry out gas pumping, and again carry out the prominent parameter prediction of coal-bed gas and whether can carry out safe coal-openning judgement.
Embodiment 2, referring to Fig. 4, a kind of large section tunnel passes through the concentration fracturing drilling and sealing structure of multiple seam, 1 is holed including with the multiple pressure breaks once concentrating pressure break number of times correspondent equal, it is correspondingly arranged a hole sealing device in each pressure break boring 1, and form hole sealing structure by corresponding hole sealing device, hole sealing device is stretched into corresponding coal seam 3 by roof 2 direction, hole sealing device includes pressure break pipe 4, grout pipe 5, pressure break pipe 4 inner end is formed with the floral tube section 4a of preseting length, floral tube section 4a is separated in floral tube section and the outer section of floral tube by horsetail 6 with tie part, in floral tube, section is used for fracturing water outlet, the outer wall of the outer section of floral tube is wound with at least one of which gauze；Horsetail 6 passes through the cotton yarn or the formation of fabric bar that are banded on pressure break pipe 4, and is positioned at roof 2, and sealing of hole section is made up of grout cures section 7 and polyurethane seal section 8.
Wherein, horsetail 6 length at least 1 meter, the tie part place of pressure break pipe 4 is welded with horsetail 6 and ties up silk fastening clothes-hook；The outer segment length at least 1 meter of floral tube；Polyurethane sealing of hole section 8 length at least 1.5 meters.
Although combining accompanying drawing above to describe embodiments of the present invention, but those of ordinary skill in the art may also be appreciated that making various change or amendment in scope of the following claims, these modifications and variations are understood as within the scope of the present invention and intention.
Claims (10)
1. large section tunnel wears a construction method for coal measure strata section, including the step of fracturing and gas pumping, it is characterised in that
Described fracturing adopts the Frac unit being laid in tunnel the same area to carry out multiple pressure break holes successively concentrating pressure break, before pressure break, data is surveyed on ground according to coal measure strata section to be traversed, determine that coal measure strata section concentrates the number of times of concentrating of pressure break once to concentrate at least two coal seam to be traversed of pressure break, and at the first setpoint distance place in the to be traversed first coal seam once concentrating fracturing, coal seam to be traversed is carried out essence spy, exposed coal layer thickness and the accurate parameter of adjacent coal bed spacing is respectively treated to obtain, and respectively treat the Methane Diffusion speed of exposed coal layer and the Gas Outburst parameter of pressure；Determine Coal Seam Prone To Outburst according to Gas Outburst parameter and once concentrate pressure break bore position and the degree of depth of fracturing, and brill and sealing of hole are executed in pressure break boring；
Described gas pumping includes the concentration extraction after fracturing to two or more coal seam, and at the second setpoint distance place of tunnel piercing to arbitrary coal seam to the independent extraction treating pick coal seam by digging.
2. large section tunnel according to claim 1 passes through the construction method of coal measure strata section, it is characterised in that described independent extraction is additionally included in tunnel piercing and carries out to the 3rd setpoint distance place treating pick coal seam by digging.
3. large section tunnel according to claim 2 passes through the construction method of coal measure strata section, it is characterised in that described 3rd setpoint distance is 2.5～3.5m.
4. large section tunnel according to claim 1 passes through the construction method of coal measure strata section, it is characterised in that also include Gas Outburst parameter detecting after described gas pumping, to judge whether tunnel can carry out safe driving；It is then continue driving；No, then continue extraction, and again judge whether tunnel can carry out safe driving by Gas Outburst parameter detecting.
5. large section tunnel according to claim 1 passes through the construction method of coal measure strata section, it is characterized in that, it is additionally included in tunnel piercing to coal seam when opening, the concordant coal seam prediction boring of construction Gas Outburst parameter prediction in coal seam, predict that boring carries out the prominent parameter prediction of coal-bed gas by concordant coal seam, and judge whether tunnel can carry out safe coal-openning, it is then continue exposed coal to passing through this coal seam；No, then carry out gas pumping, and again carry out the prominent parameter prediction of coal-bed gas and whether can carry out safe coal-openning judgement.
6. the large section tunnel according to any one claim in Claims 1 to 5 passes through the construction method of coal measure strata section, it is characterised in that described first setpoint distance is 10～12m；Described second setpoint distance place is 5～6m.
7. the large section tunnel according to any one claim in Claims 1 to 5 passes through the construction method of coal measure strata section, it is characterised in that in described multiple pressure break holes, the sealing of hole section of at least one has the part in the coal seam passed through.
8. the large section tunnel according to any one claim in Claims 1 to 5 passes through the construction method of coal measure strata section, it is characterized in that, in the tunneling process of described Tunnel Passing coal measure strata section, also include the coal body to coal measure strata section and rock mass segmentation carries out advance support process, this advance support includes entering steel pipe at the coal and rock embedded in hole of coal measure strata section, adopt cement grout to consolidate, in multiple steel pipes setting regions outside the outline excavation control line of middle and upper part, tunnel and lateral wall, form canopy formula advance support structure.
9. a large section tunnel passes through the concentration fracturing drilling and sealing structure of multiple seam, it is characterized in that, (1) is holed including with the multiple pressure breaks once concentrating pressure break number of times correspondent equal, it is correspondingly arranged a hole sealing device in each pressure break boring (1), and form hole sealing structure by corresponding hole sealing device, hole sealing device is stretched into corresponding coal seam (3) by roof (2) direction, hole sealing device includes pressure break pipe (4), grout pipe (5), pressure break pipe (4) inner end is formed with the floral tube section (4a) of preseting length, the tie part that floral tube section (4a) starches structure (6) by horsetail form drag is separated in floral tube section and the outer section of floral tube, in floral tube, section is used for fracturing water outlet, the outer wall of the outer section of floral tube is wound with at least one of which gauze；Horsetail form drag slurry structure (6) passes through the cotton yarn or the formation of fabric bar that are banded on pressure break pipe (4), and it being positioned at roof (2), sealing of hole section is made up of grout cures section (7) and polyurethane seal section (8).
10. large section tunnel according to claim 9 passes through the concentration fracturing drilling and sealing structure of multiple seam, it is characterized in that, described horsetail form drag slurry structure (6) length at least 1 meter, the tie part place of pressure break pipe (4) is welded with horsetail form drag slurry structure (6) and ties up with multiple anti-skid studs or anti-slop serrations；The outer segment length at least 1 meter of described floral tube；Described polyurethane sealing of hole section (8) length at least 1.5 meters.
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| CN106869894A (en) * | 2017-03-21 | 2017-06-20 | 阳泉煤业（集团）有限责任公司 | The many pumps of weak seam top board concordant rock long drilled holes coordinate pressure break anti-reflection method |
| CN106968675A (en) * | 2017-03-20 | 2017-07-21 | 中铁十五局集团有限公司 | The construction method in gas tunnel goaf |
| CN107091111A (en) * | 2017-04-18 | 2017-08-25 | 中交路桥华南工程有限公司 | The gas preprocess method in tunnel |
| CN109252829A (en) * | 2018-10-16 | 2019-01-22 | 中铁十九局集团第二工程有限公司 | Karst method for treating water in team road |
| CN110067591A (en) * | 2018-01-24 | 2019-07-30 | 中铁二院工程集团有限责任公司 | Tunnel and flat lead pass through coal seam construction gas drainage method |
| CN110344830A (en) * | 2019-07-17 | 2019-10-18 | 中铁二院重庆勘察设计研究院有限责任公司 | Continuous several times wear coal tunnel exposed coal protrusion-dispelling work flow under the conditions of a kind of complicated structure |
| CN111335939A (en) * | 2020-04-08 | 2020-06-26 | 中国建筑第四工程局有限公司 | Hydraulic fracturing permeability-increasing process for super-thick coal seam of highway gas outburst tunnel |
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