Tunnel steeply-inclined coal seam goaf advanced curtain grouting process and grouting equipment

Abstract

The invention relates to the technical field of tunnel construction, in particular to a full-section advanced curtain grouting process before excavation of a tunnel steeply inclined coal seam goaf, which comprises the following steps: S1, mounting a drilling machine operation platform and a slurry mixing and grouting pump construction platform in place; s2, a grouting hole arrangement scheme is planned before construction, and an advanced deep hole grouting reinforcement mode is adopted; s3, determining a grouting test scheme; s4, drilling is conducted according to the hole position arrangement diagram, and the horizontal angle and the vertical angle of a drilled hole are the same as those of the design; s5, mounting an orifice pipe; s6, two drill holes are selected as grouting holes and advanced geological exploration holes for drilling, and a grouting test is carried out; s7, in the grouting process, any one of a full-hole one-time grouting process, an advancing type segmented grouting process and a horizontal sleeve valve tube bundle segmented grouting process is adopted according to geological conditions; and S8, grouting testing is conducted on the single hole. The method has the effect of solving the problem that a large amount of leakage occurs in the sharp-dip coal seam goaf in the tunnel excavation process.

Description

Technical Field

[0001] The present application relates to the technical field of tunnel construction, and in particular to an advanced curtain grouting process and grouting equipment for a goaf of a steeply inclined coal seam in a tunnel. Background Art

[0002] At present, steep coal seam goaf refers to underground cavities or spaces caused by goaf during coal mining. When underground tunnels pass through such goafs, they may face a series of geological engineering challenges. Due to the existence of goafs, the underground rock mass is damaged and deformed, which may increase the risk of geological disasters during tunnel construction.

[0003] With respect to the above-mentioned related technologies, the inventors believe that if the gas concentration in the goaf of the steeply inclined coal seam is too high, the gas may easily leak in large quantities during the tunnel excavation process. A large amount of gas will flow into the excavated tunnel, posing a huge danger to the on-site construction workers. Therefore, how to excavate the tunnel normally under the goaf of the steeply inclined coal seam in the mountain without causing large-scale gas leakage is a technical problem that needs to be urgently solved in the current gas tunnel construction operations. Summary of the invention

[0004] In order to improve the problem of large-scale leakage in the goaf of steeply inclined coal seams during tunnel excavation, the present application provides an advanced curtain grouting process and grouting equipment for the goaf of steeply inclined coal seams in a tunnel.

[0005] In the first aspect, the present application provides an advanced curtain grouting process and grouting equipment for a steeply inclined coal seam goaf in a tunnel, which adopts the following technical solutions: An advanced curtain grouting process and grouting equipment for a tunnel steep coal seam goaf, comprising: S1: According to the design drawings, the surrounding rock of 5m in front of the tunnel face is used as a grouting plate. At the same time, the drilling rig operating platform and the grout mixing and grouting pump construction platforms are installed in place to seal the tunnel face; S2: Plan the grouting hole arrangement plan before construction, adopt the advanced deep hole grouting reinforcement method, and design the number, length and spacing of the holes in advance; before the curtain grouting construction, select at least 6 test holes in advance for pre-construction; S3: Based on the characteristics of mountain coal mine goaf and the actual grouting effect, explore the vertical and circumferential grouting diffusion mechanism of tunnel crossing range in long-term closed area of ​​large-scale steep-inclined room-and-pillar goaf with high gas content, optimize the grouting process and grouting parameters; and determine the final grouting scheme through simulation of grouting diffusion and mechanism and experimental verification; S4: Drill holes according to the hole layout diagram. When drilling holes, align the drilling machine with the hole positions arranged in advance and adjust the drilling machine to the designed drilling direction, that is, the horizontal angle and vertical angle of the drilling hole are the same as the design; S5: After the hole is opened, a hole-mouth pipe is installed at the hole, and hemp or geotextile is wrapped into a spindle, and the gap between the spindle and the surrounding rock is blocked with an anchoring agent; if the water outflow from the hole is large, a hose is installed at the end of the hole-mouth pipe to centrally drain the water flow; S6: Pre-select 2 boreholes as grouting holes and advance geological exploration holes for drilling, and conduct grouting tests; adopt skip hole interval grouting during grouting, and the on-site grouting sequence is: first grout the outer circle holes and then the inner circle holes; when on the same circle of holes, first grout the upper holes and then the lower holes; according to the geological conditions, first grout the waterless areas and then the water areas; according to the underground dynamic water flow, first inject from the end with high water head; reinforce soil layers with the same permeability coefficient and grout from top to bottom; when the permeability coefficient of the soil layer increases with depth, grout from bottom to top; S7: According to different formation conditions, the grouting method can be any one of the full-hole one-time grouting process, the forward segmented grouting process and the horizontal sleeve valve bundle segmented grouting process; that is, during the grouting process, different grouting processes can be adjusted and selected in time according to the drilling conditions; S8: When grouting a single hole, test the pressure of the single hole grouting. If the final pressure of the single hole grouting reaches 5Mpa for more than ten minutes, the hole can be terminated. After all the designed grouting holes have reached the grouting end standard and there is no leakage, select the design inspection holes according to 3% to 5% of the total number of grouting holes. The inspection holes should also meet the design requirements before all grouting can be completed.

[0006] In the second aspect, the present application provides a tunnel steep coal seam goaf advance curtain grouting process and grouting equipment, adopting the following technical solutions: Optionally, an advanced curtain grouting device for a steeply inclined coal seam goaf in a tunnel is used to implement an advanced curtain grouting process for a steeply inclined coal seam goaf in a tunnel, and further includes a horizontal drilling rig and a grouting pump. The horizontal drilling rig is used to drill holes on a grouting rock plate, and the grouting pump is used to inject grout into the formed hole. The horizontal drilling rig includes a drilling rig body and a drill rod arranged at the power end of the drilling rig body. The drill rod includes a drill bit rod and a plurality of spliced ​​rods. The plurality of spliced ​​rods are coaxially spliced, and the drill bit rod is arranged at the end of the spliced ​​rod. The tail of the splicing rod is arranged on the drilling rig body, a mounting cavity is opened in the drill rod, a mounting rod is slidably arranged in the mounting cavity, the mounting rod slides in a direction parallel to the axis of the drill rod, a partition is arranged on the mounting rod, the partition is used to partition the hole after the mounting rod is moved out of the mounting cavity, and the drill rod is placed behind the partition, a grouting part is arranged on the drill rod, and the grouting part is used to pass through the partition and inject the slurry injected by the grouting pump into the hole.

[0007] Optionally, the partition member includes a plurality of partition plates arranged circumferentially of the mounting rod, the partition plates are hingedly arranged on the partition plates, the hinge axis of the partition plates is perpendicular to the mounting rod, the partition plates are provided with two layers and are arranged along the axial direction of the mounting rod, when the two layers of the partition plates are rotated to be perpendicular to the mounting rod, the two layers of the partition plates are fitted together and both abut against the inner wall of the hole, the partition member also includes a first driving member for driving the partition plates to rotate; the partition member also includes a sealing gasket arranged on the surface of the partition plate, the sealing gasket is used to seal the gap between adjacent partition plates after the partition plates abut against each other.

[0008] Optionally, the first driving member includes a push ring slidably set on the mounting rod, the push ring slides along the axial direction of the mounting rod, a first electric push rod is provided on the mounting rod, the push ring is set on the output shaft of the first electric push rod, the first electric push rod pushes the push ring to slide and abut against the partition plate, thereby driving the partition plate to rotate to be perpendicular to the mounting rod.

[0009] Optionally, a blocking block is provided at the end of the mounting rod, and the blocking block is used to block the partition board when the partition board rotates to be perpendicular to the mounting rod, so that the partition board is in a state perpendicular to the mounting rod.

[0010] Optionally, a placement groove is provided on the partition board located at the rear layer. After the two layers of partition boards are partitioned with holes, the edge of the partition board located at the front layer is placed in the placement groove, and the middle part of the partition board at the rear layer is flush with the front partition board.

[0011] Optionally, the partition plate has mounting grooves on its arc-shaped end faces close to the mounting rod and away from the mounting rod, and a sealing airbag is arranged in the mounting groove. The sealing airbag is used to seal the gap between the partition plate, the mounting rod and the inner wall of the hole after the partition plate is perpendicular to the mounting rod.

[0012] Optionally, the grouting component includes a mounting ring arranged on the drill rod, the mounting ring is slidably arranged on the drill rod, the mounting ring slides in a direction parallel to the axis of the drill rod, a grouting catheter connected to the grouting pump passes through the mounting ring and is fixed on the mounting ring, a grouting hole for the grouting catheter to pass through is opened on the partition plate, the grouting component also includes a second driving component for driving the mounting ring to slide along the drill rod and drive the grouting catheter to pass through the partition plate; the mounting ring is relatively rotatably arranged on the drill rod.

[0013] Optionally, a plurality of fixing rods are slidably provided on the outer ring of the mounting ring, and the sliding direction of the fixing rods is perpendicular to the axial direction of the mounting ring. The mounting ring is provided with a third driving member for driving the fixing rods to slide and abut against the inner wall of the hole.

[0014] Optionally, the inner ring of the mounting ring is provided with multiple mounting plates, and the multiple mounting plates are evenly arranged along the circumference of the inner ring of the mounting ring. A mounting seat is rotatably arranged on the mounting plate, and a micro motor and a driving wheel are arranged on the mounting seat. The driving wheel is arranged on the output shaft of the micro motor, and the driving wheel abuts against the outer wall of the drill rod. A rotating motor for driving the mounting seat to rotate is arranged on the mounting plate; when the mounting ring moves forward along the rotating rod, the output shaft of the micro motor is perpendicular to the drill rod; when the drill rod is drilling, the output shaft of the micro motor is parallel to the drill rod.

[0015] In summary, the present application includes at least one of the following beneficial technical effects: 1. During the tunnel excavation process, it can effectively reinforce the surrounding rock mass, reduce the degree of surface settlement, and protect the safety of surface buildings and infrastructure; form a continuous grouting curtain, effectively isolate groundwater, and prevent it from pouring into the tunnel project, thereby ensuring the safety of construction; reinforce the surrounding rock mass, enhance the overall stability of the rock mass, and effectively prevent accidents such as rock collapse and falling, thereby improving the construction quality and reliability of the tunnel project; improve the geological environment of underground projects, reduce the probability of geological disasters, and through measures such as strengthening rock mass and controlling surface settlement, it helps to reduce the risks of disasters such as earthquakes, landslides, and ground collapses; effectively block gas leakage in the goaf, so that during the tunnel excavation and drilling process, it is ensured that gas is not easy to affect normal construction operations; 2. During grouting, the horizontal drill drills a hole on the grouting rock plate, and then injects mortar into the hole through a grouting pump. When segmented grouting is adopted, after drilling 3-5m, the drill rod is removed from the hole, and then grouting is performed. Then the drill rod is used for drilling, and then grouting is performed. The above process is repeated to complete the grouting operation. In the above process, the grouting efficiency is low; after the drill rod drills a hole for the next stage, the drill rod retreats a certain distance to the grouted hole, and then the installation rod is removed from the installation cavity, and then the partition piece partitions the hole. The partition piece partitions at the junction of the grouted and ungrouted areas, and then the grouting piece passes through the partition piece and injects mortar into the next hole, thereby completing the next stage of hole grouting. In the above process, there is no need to remove the drill rod from the hole, thereby improving the grouting effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of an advanced curtain grouting device for a goaf of a steeply inclined coal seam in a tunnel according to an embodiment of the present application; Figure 2 It is a structural schematic diagram of a drill rod in an advanced curtain grouting device for a goaf of a steeply inclined coal seam in a tunnel according to an embodiment of the present application; Figure 3 It is a cross-sectional view of a drill rod in an advanced curtain grouting device for a goaf of a steeply inclined coal seam in a tunnel according to an embodiment of the present application; Figure 4It is a structural schematic diagram of a partition member in an advanced curtain grouting device for a goaf of a steeply inclined coal seam in a tunnel according to an embodiment of the present application; Figure 5 It is a back view of a partition plate in an advanced curtain grouting device for a goaf of a steeply inclined coal seam in a tunnel according to an embodiment of the present application; Figure 6 It is a schematic diagram of the explosion of two layers of partition boards in an advanced curtain grouting device for a goaf of a steeply inclined coal seam in a tunnel according to an embodiment of the present application; Figure 7 yes Figure 4 Enlarged schematic diagram of part A.

[0017] Description of reference numerals: 1. horizontal drilling rig; 11. drilling rig body; 12. drill rod; 13. splicing rod; 2. grouting pump; 3. installation cavity; 4. installation rod; 5. Partition piece; 51. Partition plate; 52. Push ring; 53. First electric push rod; 6. Grouting parts; 61. Mounting ring; 62. Grouting conduit; 7. Driving push rod; 8. Blocking block; 9. Placement slot; 10. Mounting slot; 14. Sealing airbag; 15. Grouting hole; 16. Fixing rod; 17. Second electric push rod; 18. Mounting plate; 19. Mounting seat; 20. Micro motor; 21. Driving wheel; 22. Rotating motor. DETAILED DESCRIPTION

[0018] The following is combined with Figure 1-7 This application is described in further detail.

[0019] The present application embodiment discloses a tunnel steep coal seam goaf area advanced curtain grouting process. Figure 1 , the advanced curtain grouting technology for the goaf of steeply inclined coal seams in tunnels includes; S1: According to the design drawings, the surrounding rock of 5m in front of the face is used as a grout-stopping rock plate, and the horizontal drilling rig 1 operating platform and the grout mixing and grouting pump 2 construction platform are installed in place to close the face; in this embodiment, the length of the horizontal drilling rig 1 operating platform used is 10m, and the top surface of the horizontal drilling rig 1 operating platform is 5m away from the arch, which is convenient for the horizontal drilling rig 1 to carry out construction. The grout mixing and grouting pump 2 construction platform is set at the slope foot of the horizontal drilling rig 1 operating platform, and the distance from the face to the face is 20m.

[0020] S2: Plan the grouting hole arrangement plan before construction, adopt the advanced deep hole grouting reinforcement method, and design the number, length and spacing of the holes in advance; before the curtain grouting construction, select at least 6 test holes in advance for pre-construction; S3: Combined with the characteristics of mountain coal mine goaf and the actual grouting effect, the vertical and circumferential grouting diffusion mechanism of the tunnel crossing range of the long-term closed area of ​​the high-gas large-scale steep-inclined room-pillar goaf area is explored. Through field tests, coring, water injection and other test results, the grouting process and grouting parameters are optimized; combined with the toxic and harmful gas prevention and control curtain grouting in the design document, through the grouting test plan, reliable and feasible grouting parameters of the grouting process are obtained; through the simulation of grouting diffusion and mechanism and experimental verification, the optimal hole layout and final hole scheme is obtained for the grouting treatment of goaf; through different material combinations and mix ratio determinations, the appropriate grouting materials and the optimal slurry mix ratio are selected; through drilling to further analyze the characteristics of the goaf, the feasibility of the grouting process, grouting parameters and pumping concrete to fill the large-scale voids in front of the 5m crack plugging scheme are studied; S4: Drill holes according to the hole layout diagram. When drilling holes, align the horizontal drill rig 1 with the hole positions arranged in advance, and adjust the horizontal drill rig 1 to the designed drilling direction, that is, the horizontal angle and vertical angle of the drill hole are the same as the design; when drilling holes, strict drilling records should be made, including: hole number, footage, start and end time, rock fissure development, location coordinates of water gushing, water gushing amount at the water gushing location, and water gushing pressure at the water gushing location; and technical measures for drilling and dust prevention measures for drilling should be formulated during the drilling process; the technical measures for the drilling process are as follows: 1. In order to just remove the rock debris in the borehole and reduce the wear of the horizontal drill rig 1, the impactor should be lifted from the bottom of the hole frequently to fully discharge the slag from the borehole; 2. If the hole collapses suddenly, or water gushing or rock stratum ruptures during drilling cause the drill to get stuck, the drilling should be stopped, and the impactor should be kept in motion and immediately moved up and down in the hole, and the impactor speed should be increased until the impactor can move up and down freely, so that the rock debris can be discharged from the hole. 3. When adding drill rods to the horizontal drilling rig 1, pay special attention to the cleaning inside the drill rod to prevent dirt such as sand, rock debris and rust in the pipe from entering the impactor, causing damage to parts or drilling stoppage. The drill rod thread should be greased; 4. When a drill rod is finished, the rock debris in the hole must be blown clean, and then the gas volume is reduced, and the impactor is gradually placed in the bottom of the hole. After a while, the gas is slowly stopped before connecting another drill rod to prevent rock debris from flowing back into the impactor; 5. When replacing the drill bit, Make sure that the diameter of the replacement drill bit is smaller than the replaced drill bit to prevent it from getting stuck in the hole when replacing the drill bit; 6. Check the wear of the round key and the pin regularly, and repair or replace them in time to prevent the drill bit from falling into the hole; Dust prevention measures during drilling are as follows: 1. During normal drilling without water, a large amount of dust will return from the hole. A dust cover needs to be installed at the hole mouth, and high-pressure water should be sprayed between the dust cover and the hole mouth; 2. On-site staff need to wear dust masks and protective glasses; 3. Strengthen ventilation on site.

[0021] S5: After the hole is opened, a hole-mouth pipe is installed at the hole, and hemp or geotextile is wrapped into a spindle, and the gap between the spindle and the surrounding rock is blocked with an anchoring agent; if the water outflow from the hole is large, a hose is installed at the end of the hole-mouth pipe to centrally drain the water flow; S6: Pre-select 2 boreholes as grouting holes and advance geological exploration holes for drilling, and conduct grouting tests; adopt skip hole interval grouting during grouting, and the on-site grouting sequence is: first grout the outer circle holes and then the inner circle holes; when on the same circle of holes, first grout the upper holes and then the lower holes; according to the geological conditions, first grout the waterless areas and then the water areas; according to the underground dynamic water flow, first inject from the end with high water head; reinforce soil layers with the same permeability coefficient and grout from top to bottom; when the permeability coefficient of the soil layer increases with depth, grout from bottom to top; S7: According to different formation conditions, the grouting method can be any one of the full-hole one-time grouting process, the forward segmented grouting process and the horizontal sleeve valve bundle segmented grouting process; that is, during the grouting process, different grouting processes can be adjusted and selected in time according to the drilling conditions; Full hole one-time grouting process: After adjusting the angle of the horizontal drilling rig 1, use a Φ96mm drill bit to drill to the designed depth at one time. Considering the possibility of sudden water and mud gushing during the drilling process, a high-pressure gate valve is installed at the front end of the orifice pipe before drilling, and the drilling grouting construction is carried out through the high-pressure gate valve; after withdrawing the drill rod, install the flange, connect the grouting pipeline and start grouting until the designed grouting end standard is reached.

[0022] Forward-type segmented grouting process: During the drilling and grouting construction process, the principle is to drill 3 to 5 meters deep each time, then withdraw the drill to carry out grouting construction. After the grouting reaches the design end standard, drill 3 to 5 meters further and carry out grouting, and repeat this cycle until the drilling and grouting reaches the design depth. During construction, the length of the drilling and grouting segment can be appropriately adjusted according to the geological conditions and the amount of water produced by the borehole.

[0023] Horizontal sleeve valve pipe bundle segmented grouting process: first lower a 30m long Φ42mm rigid sleeve valve pipe to the bottom of the hole, then lower a 20m long rigid sleeve valve pipe, the sleeve valve pipe is exposed about 30cm from the stop wall, and the grouting joint is connected by thread. Grouting: first connect the 20m sleeve valve pipe for hole sealing grouting, and end the grouting when the hole is closed or the design pressure is reached; then grout the 23m sleeve valve pipe, and finally grout the 30m sleeve valve pipe.

[0024] S8: When grouting a single hole, test the pressure of the single hole grouting. If the final pressure of the single hole grouting reaches 5Mpa for more than ten minutes, the hole can be terminated. After all the designed grouting holes have reached the grouting end standard and there is no leakage, select the design inspection holes according to 3% to 5% of the total number of grouting holes. The inspection holes should also meet the design requirements before all grouting can be completed.

[0025] The implementation principle of the advanced curtain grouting process in the goaf of a steeply inclined coal seam in a tunnel according to the embodiment of the present application is as follows: After full-section advanced curtain grouting, during the tunnel excavation process, the surrounding rock mass can be effectively reinforced, the degree of surface subsidence can be reduced, and the safety of surface buildings and infrastructure can be protected; a continuous grouting curtain is formed to effectively isolate groundwater and prevent it from pouring into the tunnel project, thereby ensuring the safety of construction; the surrounding rock mass is reinforced, and the overall stability of the rock mass is enhanced, which can effectively prevent accidents such as rock collapse and falling, and improve the construction quality and reliability of the tunnel project; the geological environment of the underground project is improved, and the probability of geological disasters is reduced. By strengthening the rock mass and controlling surface subsidence, it helps to reduce the risks of disasters such as earthquakes, landslides, and ground collapses; it can effectively block gas leakage in the goaf, so that during the tunnel excavation and drilling process, it is ensured that gas is not easy to affect normal construction operations.

[0026] The present application embodiment discloses an advanced curtain grouting device for a tunnel steep coal seam goaf, which is used to implement an advanced curtain grouting process for a tunnel steep coal seam goaf, referring to Figure 1 , further comprising a horizontal drilling rig 1 and a grouting pump 2, the horizontal drilling rig 1 being used for drilling holes on a grouting rock plate, the grouting pump 2 being used for grouting into the formed hole, the horizontal drilling rig 1 comprising a drilling rig body 11 and a drill rod arranged at a power end of the drilling rig body 11, the drill rod comprising a drill bit rod 12 and a plurality of spliced ​​rods 13, the plurality of spliced ​​rods 13 being coaxially spliced, the drill bit rod 12 being arranged at the end of the spliced ​​rod 13, and the tail of the spliced ​​rod 13 being arranged on the drilling rig body 11; Reference Figure 2 and Figure 3 A mounting cavity 3 is provided in the drill rod 12, and the mounting cavity 3 is coaxial with the mounting rod 4. A mounting rod 4 is slidably arranged in the mounting cavity 3, and the mounting rod 4 slides in a direction parallel to the axis of the drill rod 12. A partition 5 is provided on the mounting rod 4, and the partition 5 is used to partition the hole after the mounting rod 4 is moved out of the mounting cavity 3, and the drill rod 12 is placed behind the partition 5. A grouting part 6 is provided on the drill rod, and the grouting part 6 is used to pass through the partition 5 and inject the slurry injected by the grouting pump 2 into the hole; further, a driving push rod 7 is provided in the mounting cavity 3, and the output shaft of the driving push rod 7 is coaxial with the mounting rod 4, and the mounting rod 4 is coaxially arranged on the output shaft of the driving push rod 7.

[0027] Reference Figure 3 Furthermore, the inner diameter of the installation cavity 3 is larger than the diameter of the installation rod 4, which makes it easy to recycle the installation rod 4 and the partition member 5 into the installation cavity 3, and facilitates the drilling operation of the rock formation in the subsequent process.

[0028] During the forward staged grouting, after the drill rod has drilled the next stage of the hole, the drill rod retreats a certain distance to the grouted hole, and then the installation rod 4 is removed from the installation cavity 3, and then the partition member 5 partitions the hole. The partition member 5 partitions at the junction of the grouted and ungrouted areas, and then the grouting member 6 passes through the partition member 5 and injects the mortar into the next hole, thereby completing the next stage of hole grouting. In the above process, there is no need to remove the drill rod from the hole, thereby improving the grouting effect.

[0029] Reference Figure 3 and Figure 4 In the embodiment of the present application, the partition member 5 includes a plurality of partition plates 51 arranged in the circumferential direction of the mounting rod 4, the partition plates 51 are fan-shaped plates, and the end faces of the partition plates 51 close to the mounting rod 4 are arc-shaped, the partition plates 51 are hingedly arranged on the partition plates 51, the hinge axis of the partition plates 51 is perpendicular to the mounting rod 4, the partition plates 51 are provided with two layers, and are arranged along the axis direction of the mounting rod 4, when the two layers of partition plates 51 are rotated to be perpendicular to the mounting rod 4, the two layers of partition plates 51 are fitted to each other and both abut against the inner wall of the hole, and the partition member 5 also includes a first driving member for driving the partition plates 51 to rotate; Reference Figure 3 and Figure 4 The partition member 5 further includes a sealing gasket arranged on the surface of the partition plate 51, and the sealing gasket is used to seal the gap between adjacent partition plates 51 after the partition plates 51 are abutted against each other.

[0030] When partitioning the hole, the partition plate 51 is driven to rotate by the first driving member, and the partition plate 51 is rotated to a state perpendicular to the installation rod 4. After the partition plate 51 rotates, the sealing gasket is compressed, and the gap between the two layers of sealing gaskets is reduced, thereby improving the sealing between the two layers of sealing plates, thereby reducing the possibility of slurry leakage from between the sealing plates on both sides during the grouting process, and facilitating the grouting operation; after the grouting is completed, the first driving member drives the push ring 52 to retreat, and the partition plate 51 rotates toward the installation rod 4, so as to facilitate the recovery of the partition plate 51 into the installation cavity 3.

[0031] Reference Figure 3 and Figure 4 Furthermore, an end panel (not shown in the figure) is rotatably provided on the end surface of the installation cavity 3, and the end panel is used to close the port of the installation cavity 3, so as to facilitate the storage of the partition plate 51 in the installation cavity 3, thereby facilitating the drilling operation of the drill rod; further, a drive motor is provided in the inner cavity of the installation cavity 3, and the end panel is fixedly provided on the output shaft of the drive motor.

[0032] Reference Figure 3In the embodiment of the present application, the first driving member includes a push ring 52 slidably arranged on the mounting rod 4, the push ring 52 slides along the axial direction of the mounting rod 4, a first electric push rod 53 is fixedly arranged on the mounting rod 4, the length direction of the output shaft of the first electric push rod 53 is parallel to the axial direction of the mounting rod 4, the push ring 52 is fixedly arranged on the output shaft of the first electric push rod 53, the first electric push rod 53 pushes the push ring 52 to slide and abuts against the partition plate 51, and drives the partition plate 51 to rotate to be perpendicular to the mounting rod 4; when driving the partition plate 51 to rotate, the first electric push rod 53 is started, the first electric push rod 53 pushes the push ring 52 to slide, and the push ring 52 slides and drives the partition plate 51 to rotate to a vertical state, and the operation is simple and convenient. Further, a torsion spring is sleeved on the mounting shaft of the partition plate 51, and the torsion spring is used to drive the partition plate 51 to rotate toward the mounting rod 4 after the push ring 52 is separated from the partition plate 51.

[0033] Reference Figure 4 In order to ensure that the partition plate 51 is in a direction perpendicular to the axis of the mounting rod 4, in the embodiment of the present application, a blocking block 8 is provided at the end of the mounting rod 4. The blocking block 8 is used to block the partition plate 51 when the partition plate 51 is rotated to be perpendicular to the mounting rod 4, so that the partition plate 51 is in a state perpendicular to the mounting rod 4.

[0034] Reference Figure 5 and Figure 6 In order to further improve the partition effect of the partition board 51 on the hole, a placement groove 9 is opened on the partition board 51 located at the rear layer. After the two layers of partition boards 51 partition the hole, the edge of the partition board 51 located at the front layer is placed in the placement groove 9, and the middle part of the partition board 51 at the rear layer is flush with the front partition board 51; under the action of the placement groove 9, the contact area of ​​the partition boards 51 on both sides is increased, and the sealing between the sealing plates on both sides is improved, thereby reducing the possibility of slurry leakage from the gap between the partition boards 51 during the grouting process.

[0035] Reference Figure 5 and Figure 6 In order to further improve the partition effect of the partition plate 51 on the formed hole, the partition plate 51 is provided with a mounting groove 10 on the arc-shaped end surface close to the mounting rod 4 and away from the mounting rod 4. A sealing airbag 14 is arranged in the mounting groove 10. The sealing airbag 14 is used to seal the gap between the partition plate 51, the mounting rod 4 and the inner wall of the formed hole after the partition plate 51 is perpendicular to the mounting rod 4. The airbag is in an inflated state; when the partition plate 51 rotates to partition the formed hole, the airbag is in a compressed state and causes the volume to expand. During the expansion of the airbag, the gap between the partition plate 51 and the inner wall of the formed hole is filled, thereby improving the partition effect of the partition plate 51 on the formed hole.

[0036] Reference Figure 4 and Figure 7In the embodiment of the present application, the grouting member 6 includes a mounting ring 61 arranged on the drill rod, the outer diameter of the mounting ring 61 is smaller than the inner diameter of the hole, the mounting ring 61 is slidably arranged on the drill rod, the mounting ring 61 slides in a direction parallel to the axis of the drill rod, the grouting conduit 62 connected to the grouting pump 2 passes through the mounting ring 61 and is fixed on the mounting ring 61, the partition plate 51 is provided with a grouting hole 15 for the grouting conduit 62 to pass through, and the grouting member 6 also includes a device for driving the mounting ring 61 to slide along the drill rod to drive the grouting conduit 62 to pass through the partition plate 51 The second driving member; the mounting ring 61 is relatively rotatable and arranged on the drill rod; after the partition plate 51 blocks the formed hole, the mounting ring 61 is driven to slide by the second driving member, and the mounting ring 61 drives the grouting conduit 62 to slide and pass through the partition plate 51, and then the grouting pump 2 injects mortar into the formed hole. After the mortar is injected, the mortar penetrates into the formed hole; the mounting ring 61 and the drill rod are relatively rotated, so that the mounting ring 61 is in a state of being aligned with the through hole of the partition plate 51 during the drilling process of the drill rod, and at the same time, the influence of the mounting ring 61 on the rotation of the drill rod is reduced.

[0037] Reference Figure 4 and Figure 7 In the embodiment of the present application, a plurality of fixing rods 16 are slidingly arranged on the outer ring of the mounting ring 61, and the sliding direction of the fixing rods 16 is perpendicular to the axial direction of the mounting ring 61. A third driving member for driving the fixing rods 16 to slide and abut against the inner wall of the hole is arranged on the mounting ring 61. The third driving member includes a second electric push rod 17 arranged on the outer ring of the mounting ring 61, and the fixing rod 16 is fixedly arranged on the output shaft of the second electric push rod 17. During the drilling process of the drill rod, the fixing rod 16 is driven to slide by the second electric push rod 17, and the fixing rod 16 slides until it abuts against the inner wall of the hole. After the fixing rod 16 abuts against the inner wall of the hole, the mounting ring 61 is fixed in the hole, thereby reducing the possibility of position change of the mounting ring 61. At the same time, it is convenient for the mounting ring 61 to drive the grouting conduit 62 to insert into the partition plate 51.

[0038] Reference Figure 4 and Figure 7In the implementation of the present application, a plurality of mounting plates 18 are arranged on the inner ring of the mounting ring 61, and the plurality of mounting plates 18 are evenly arranged along the circumference of the inner ring of the mounting ring 61. A mounting seat 19 is rotatably arranged on the mounting plate 18, and a micro motor 20 and a driving wheel 21 are arranged on the mounting seat 19. The driving wheel 21 is arranged on the output shaft of the micro motor 20, and the driving wheel 21 abuts against the outer wall of the drill rod; when the mounting ring 61 slides along the drill rod, the micro motor 20 is started, and the micro motor 20 drives the driving wheel 21 to rotate, and the driving wheel 21 rotates to drive the mounting ring 61 to move, and the operation is simple and convenient; further, a rotating motor 22 for driving the mounting seat 19 to rotate is arranged on the mounting plate 18, and when the mounting ring 61 moves forward along the rotating rod, the output shaft of the micro motor 20 is perpendicular to the drill rod; when the drill rod is drilling, the output shaft of the micro motor 20 is parallel to the drill rod; during the drilling process of the drill rod, the mounting seat 19 is driven to rotate 90° by the rotating motor 22, so that the axial direction of the driving wheel 21 is parallel to the direction of the drill rod, which facilitates the relative rotation of the drill rod and the driving wheel 21.

[0039] The implementation principle of the advanced curtain grouting equipment for the goaf of a steeply inclined coal seam in a tunnel according to the embodiment of the present application is as follows: During the forward staged grouting, after the drill rod has formed a hole for the next stage, the drill rod retreats a certain distance to the hole that has been grouted, and then the installation rod 4 is driven to move out of the installation cavity 3 by driving the push rod 7, and then the first electric push rod 53 is started, and the first electric push rod 53 pushes the push ring 52 to slide, and the sliding of the push ring 52 drives the partition plate 51 to rotate to a vertical state. At this time, the outer partition plate 51 abuts against the blocking block 8; at the same time, the airbag is in a compressed state, and the volume of the airbag expands to fill the gap between the partition plate 51 and the inner wall of the hole; then the micro motor 20 is started, and the micro motor 20 drives the drive The wheel 21 rotates, and the driving wheel 21 rotates to drive the mounting ring 61 to move. The mounting ring 61 moves to drive the grouting tube 62 to be inserted into the partition plate 51 and pass over the partition plate 51, and the grouting pump 2 injects mortar into the hole; when the mortar is formed, the driving push rod 7 is started to drive the mounting rod 4 to retreat toward the mounting cavity 3, and then the partition plate 51 rotates toward the mounting rod 4 under the action of the torsion spring, and then the partition plate 51 and the mounting rod 4 are driven by the driving push rod 7 to be recovered into the mounting cavity 3, and then the horizontal drilling rig 1 performs the hole-forming operation again. In the above process, there is no need to move the drill rod out of the hole, thereby improving the grouting effect.

[0040] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A tunnel steep coal seam goaf advance curtain grouting process, characterized by: include; S1: According to the design drawings, the surrounding rock of 5 m in front of the tunnel face is used as a grouting plate, and the horizontal drilling rig (1) operating platform and the grout mixing and grouting pump (2) construction platform are installed in place to seal the tunnel face; S2: Plan the grouting hole arrangement plan before construction, adopt the advanced deep hole grouting reinforcement method, and design the number, length and spacing of the holes in advance; before the curtain grouting construction, select at least 6 test holes in advance for pre-construction; S3: Based on the characteristics of mountain coal mine goaf and the actual grouting effect, explore the vertical and circumferential grouting diffusion mechanism of tunnel crossing range in long-term closed area of ​​large-scale steep-inclined room-and-pillar goaf with high gas content, optimize the grouting process and grouting parameters; and determine the final grouting scheme through simulation of grouting diffusion and mechanism and experimental verification; S4: drilling holes according to the hole arrangement diagram, aligning the hole positions arranged in advance with the horizontal drilling machine (1) during drilling, and adjusting the horizontal drilling machine (1) to the designed drilling direction, that is, the horizontal angle and vertical angle of the drilling hole are the same as the design; S5: After the hole is opened, a hole-mouth pipe is installed at the hole, and hemp or geotextile is wrapped into a spindle, and the gap between the spindle and the surrounding rock is blocked with an anchoring agent; if the water outflow from the hole is large, a hose is installed at the end of the hole-mouth pipe to centrally drain the water flow; S6: Pre-select 2 boreholes as grouting holes and advance geological exploration holes for drilling, and conduct grouting tests; adopt skip hole interval grouting during grouting, and the on-site grouting sequence is: first grout the outer circle holes and then the inner circle holes; when on the same circle of holes, first grout the upper holes and then the lower holes; according to the geological conditions, first grout the waterless areas and then the water areas; according to the underground dynamic water flow, first inject from the end with high water head; reinforce soil layers with the same permeability coefficient and grout from top to bottom; when the permeability coefficient of the soil layer increases with depth, grout from bottom to top; S7: According to different formation conditions, the grouting method can be any one of the full-hole one-time grouting process, the forward segmented grouting process and the horizontal sleeve valve bundle segmented grouting process; that is, during the grouting process, different grouting processes can be adjusted and selected in time according to the drilling conditions; S8: When grouting a single hole, test the pressure of the single hole grouting. If the final pressure of the single hole grouting reaches 5Mpa for more than ten minutes, the hole can be terminated. After all the designed grouting holes (have reached the grouting end standard and there is no leakage, and 3% to 5% of the total number of grouting holes are selected for design inspection holes, the inspection holes should also meet the design requirements before all grouting can be completed.

2. An advanced curtain grouting equipment for steeply inclined coal seam goaf in a tunnel, used to implement the advanced curtain grouting process for steeply inclined coal seam goaf in a tunnel as claimed in claim 1, characterized in that: It also includes a horizontal drilling rig (1) and a grouting pump (2), wherein the horizontal drilling rig (1) is used for drilling a hole on a grouting rock plate, and the grouting pump (2) is used for injecting grout into the formed hole. The horizontal drilling rig (1) includes a drilling rig body (11) and a drill rod arranged at the power end of the drilling rig body (11), and the drill rod includes a drill bit rod (12) and a plurality of spliced ​​rods (13), wherein the plurality of spliced ​​rods (13) are coaxially spliced, the drill bit rod (12) is arranged at the end of the spliced ​​rod (13), and the tail of the spliced ​​rod (13) is arranged on the drilling rig body (11). A mounting cavity (3) is provided in the drill bit (12), a mounting rod (4) is slidably provided in the mounting cavity (3), the mounting rod (4) slides in a direction parallel to the axis of the drill bit rod (12), a partition (5) is provided on the mounting rod (4), the partition (5) is used to partition the hole after the mounting rod (4) is removed from the mounting cavity (3), and the drill bit rod (12) is placed behind the partition (5), a grouting part (6) is provided on the drill rod, and the grouting part (6) is used to pass through the partition (5) and inject the slurry injected by the grouting pump (2) into the hole.

3. The advanced curtain grouting equipment for steeply inclined coal seam goaf in tunnel according to claim 2 is characterized by: The partition member (5) comprises a plurality of partition plates (51) arranged in the circumferential direction of the mounting rod (4); the partition plates (51) are hingedly arranged on the partition plates (51); the hinge axis of the partition plates (51) is perpendicular to the mounting rod (4); the partition plates (51) are provided with two layers and are arranged along the axis direction of the mounting rod (4); when the two layers of the partition plates (51) are rotated to be perpendicular to the mounting rod (4), the two layers of the partition plates (51) are fitted together and both abut against the inner wall of the formed hole; the partition member (5) further comprises a first driving member for driving the partition plates (51) to rotate; the partition member (5) further comprises a sealing gasket arranged on the plate surface of the partition plates (51); the sealing gasket is used to seal the gap between adjacent partition plates (51) after the partition plates (51) are abutted against each other.

4. The advanced curtain grouting equipment for steeply inclined coal seam goaf in tunnel according to claim 3 is characterized by: The first driving member comprises a push ring (52) slidably arranged on the mounting rod (4), the push ring (52) slides along the axial direction of the mounting rod (4), a first electric push rod (53) is arranged on the mounting rod (4), the push ring (52) is arranged on the output shaft of the first electric push rod (53), the first electric push rod (53) pushes the push ring (52) to slide and abut against the partition plate (51), thereby driving the partition plate (51) to rotate to be perpendicular to the mounting rod (4).

5. The advanced curtain grouting equipment for steeply inclined coal seam goaf in tunnel according to claim 4 is characterized by: A blocking block (8) is provided at the end of the mounting rod (4). When the partition plate (51) rotates to be perpendicular to the mounting rod (4), the blocking block (8) blocks the partition plate (51) so that the partition plate (51) is in a state perpendicular to the mounting rod (4).

6. The advanced curtain grouting equipment for steeply inclined coal seam goaf in tunnel according to claim 3 is characterized by: The partition board (51) at the rear layer is provided with a placement groove (9). After the two layers of partition boards (51) are partitioned by holes, the edge of the partition board (51) at the front layer is placed in the placement groove (9), and the middle of the partition board (51) at the rear layer is flush with the front partition board (51).

7. The advanced curtain grouting equipment for steeply inclined coal seam goaf in tunnel according to claim 3 is characterized by: The partition plate (51) is provided with mounting grooves (10) on its arc-shaped end faces close to the mounting rod (4) and away from the mounting rod (4). A sealing airbag (14) is arranged in the mounting groove (10). The sealing airbag (14) is used to seal the gap between the partition plate (51), the mounting rod (4) and the inner wall of the hole after the partition plate (51) is perpendicular to the mounting rod (4).

8. The advanced curtain grouting equipment for steeply inclined coal seam goaf in tunnel according to claim 3 is characterized by: The grouting member (6) comprises a mounting ring (61) arranged on a drill rod, the mounting ring (61) being slidably arranged on the drill rod, the mounting ring (61) sliding in a direction parallel to the axis of the drill rod, a grouting conduit (62) connected to the grouting pump (2) passing through the mounting ring (61) and being fixed on the mounting ring (61), a grouting hole (15) for the grouting conduit (62) to pass through is provided on the partition plate (51), and the grouting member (6) further comprises a second driving member for driving the mounting ring (61) to slide along the drill rod and drive the grouting conduit (62) to pass through the partition plate (51); the mounting ring (61) being relatively rotatably arranged on the drill rod.

9. The advanced curtain grouting equipment for steeply inclined coal seam goaf in tunnel according to claim 8, characterized in that: The outer ring of the mounting ring (61) is slidably provided with a plurality of fixing rods (16), the sliding direction of the fixing rods (16) being perpendicular to the axial direction of the mounting ring (61), and the mounting ring (61) is provided with a third driving member for driving the fixing rods (16) to slide and abut against the inner wall of the hole.

10. The advanced curtain grouting equipment for steeply inclined coal seam goaf in tunnel according to claim 8, characterized in that: The inner ring of the mounting ring (61) is provided with a plurality of mounting plates (18), the plurality of mounting plates (18) being evenly arranged along the circumference of the inner ring of the mounting ring (61), a mounting seat (19) being rotatably arranged on the mounting plate (18), a micro motor (20) and a driving wheel (21) being arranged on the mounting seat (19), the driving wheel (21) being arranged on the output shaft of the micro motor (20), the driving wheel (21) being in contact with the outer wall of the drill rod, and a rotating motor (22) for driving the mounting seat (19) to rotate being arranged on the mounting plate (18); when the mounting ring (61) moves forward along the rotating rod, the output shaft of the micro motor (20) is perpendicular to the drill rod; when the drill rod is drilling, the output shaft of the micro motor (20) is parallel to the drill rod.

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