A method for constructing a crossheading in hard rock

Abstract

The application discloses a construction method of a connecting passage in hard rock strata, which cuts the cross section rock strata of the connecting passage by a rope saw machine from outside to inside in regions and segments, and then cuts the rock column formed by the rope saw machine into pieces by a cutting device, so that the rock column can be directly taken out from the rock strata, the segmented excavation of the connecting passage is realized, and therefore, when the rope saw machine is arranged, it is unnecessary to connect tracks and to frequently adjust the length of the rope saw chain, and the construction efficiency is greatly improved. The rock column formed after cutting is relatively complete and can be repeatedly used, and has high economic value.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tunnel construction, in particular to a construction method of a connecting passage in hard rock stratum. BACKGROUND

[0002] The connecting passage refers to a tunnel between two parallel subway tunnels, which ensures the safety of driving in the two parallel tunnels and connects them. If an accident such as a car accident or a fire occurs in one of the tunnels, relevant personnel can safely transfer to the other tunnel to escape.

[0003] At present, the connecting passage is mostly excavated by water drilling method and blasting method. The water drilling method is mostly used in soft soil stratum. When the geology is hard rock stratum, the construction efficiency of the water drilling method will be greatly reduced. The existing blasting method construction uses explosives for blasting, and after the slag is removed, the tunnel wall formed by blasting is uneven, and the blasting inevitably damages the structure of the mountain and rock mass, resulting in poor stability of the mountain, which is prone to landslides and other hazards that endanger the safety of construction personnel and equipment, and continuously increases the cost of manpower and other materials invested in tunnel construction to ensure safety.

[0004] Therefore, a rope saw machine is now mostly used for tunnel construction in hard soil stratum. The rope saw machine includes a main machine, a driving wheel, a guide wheel, a track, a rope saw chain and other components. During construction, the cutting area is first divided on the construction surface according to the calculation results, then drilling is performed according to the edge lines of the divided cutting area, and then the rope saw chain is inserted into two drill holes located on the same edge line. During cutting, the driving wheel drives the rope saw chain to rotate, the rope saw chain cuts the rock stratum, and the main machine slides on the track during the cutting process until the rock stratum is cut off, which can significantly improve the construction efficiency.

[0005] However, when the rope saw method is used for connecting passage construction, the track and the main machine and other equipment need to be arranged in the subway tunnel, and the space in the subway tunnel is small, which makes it difficult to meet the requirements of connecting the track, resulting in the need to frequently adjust the position of the main machine and the length of the rope saw chain during cutting, thereby wasting a lot of time and affecting the construction efficiency. SUMMARY

[0006] In order to solve the above-mentioned problems, the present application provides a construction method of a connecting passage in hard rock stratum.

[0007] The construction method of a connecting passage in hard rock stratum provided by the present application adopts the following technical scheme:

[0008] A construction method of a connecting passage in hard rock stratum, which divides the connecting passage into segments for excavation, including the following steps:

[0009] S1, a plurality of first drill holes are drilled along the section contour line of the connecting passage at intervals, and a plurality of second drill holes are drilled inside the section contour line, the drilling depth of the first drill holes and the second drill holes is matched with the single track length of the wire saw machine;

[0010] S2, the rock between adjacent first drill holes is cut from outside to inside by the wire saw machine to form a first cutting seam, the rock between adjacent second drill holes is cut from outside to inside by the wire saw machine to form a second cutting seam, and the rock between the first drill hole and the second drill hole is cut from outside to inside by the wire saw machine to form a third cutting seam;

[0011] S3, the rock column formed after being cut by the wire saw machine is cut off by the cutting device, and then the rock column is taken out;

[0012] S4, clean the rock slag;

[0013] S5, repeat the steps S1-S4 until the first drill hole and the second drill hole pass through the other side tunnel of the connecting passage; thereafter, the connecting passage is cut in regions by the wire saw machine, and then the rock column is taken out;

[0014] S6, trim the side wall and arch wall of the connecting passage;

[0015] S7, install the arch wall steel frame, steel mesh and longitudinal connecting steel bars of the steel frame in the connecting passage, and then spray the primary support concrete to complete the excavation of the connecting passage.

[0016] By adopting the above technical scheme, the rock column formed after being cut by the wire saw machine is cut off by the cutting device, so that the rock column can be directly taken out from the rock stratum, the connecting passage is excavated in sections, and when the wire saw machine is arranged, the track does not need to be connected, and the length of the first wire saw chain does not need to be frequently adjusted, thereby greatly improving the construction efficiency. The rock column formed after cutting is relatively complete and can be reused, which has high economic value.

[0017] Preferably, the wire saw machine comprises a track and a main machine installed on the track, and the main machine is provided with a wire saw device, a first driving assembly for driving the wire saw device to move in the vertical direction, and a second driving assembly for driving the wire saw device to rotate.

[0018] By adopting the above technical scheme, because the first drill hole is drilled along the section contour line of the connecting passage and the second drill hole is drilled inside the section contour line, during the process of cutting the section of the connecting passage in regions, the position of the wire saw device needs to be frequently adjusted. Therefore, by setting the first driving assembly and the second driving assembly, the height and cutting angle of the wire saw device are conveniently adjusted, thereby facilitating the improvement of the cutting efficiency.

[0019] Preferably, the rope saw device comprises a first rope saw chain and a driving mechanism for driving the first rope saw chain to rotate, the driving mechanism comprises a mounting box, a driving wheel arranged on the mounting box, and two driven wheels distributed on the upper and lower sides of the driving wheel respectively, the driven wheels are connected with guide rods, the guide rods are provided with reversing wheels at the ends away from the driven wheels, and the first rope saw chain is sleeved between the driving wheel, the driven wheels, and the reversing wheels.

[0020] By adopting the above technical scheme, when cutting the rock between the adjacent first drill holes, the position of the rope saw device is first adjusted, the two guide rods are inserted into the corresponding two first drill holes respectively, then the driving mechanism is driven to rotate the first rope saw chain, the first rope saw chain cuts the rock layer during the rotation process, the main machine automatically moves forward on the track according to the cutting speed of the first rope saw chain, and when the positioning wheel moves to the bottom of the first drill hole, the cutting is completed. Similarly, the cutting process of the rock between the adjacent second drill holes and the cutting process of the rock between the first drill hole and the second drill hole are consistent with the above cutting process, which will not be repeated here.

[0021] Preferably, the driving mechanism further comprises two tensioning wheels, the tensioning wheels are arranged between the driving wheel and the driven wheels, the two tensioning wheels are distributed on the upper and lower sides of the driving wheel respectively, the first rope saw chain passes between the two tensioning wheels, and the mounting box is provided with a first driving component for driving the two driven wheels to move towards or away from each other and a second driving component for driving the two tensioning wheels to move towards or away from each other.

[0022] By adopting the above technical scheme, there are many influencing factors in the actual drilling process, so that the distance between the adjacent first drill holes, the distance between the adjacent second drill holes, and the distance between the first drill hole and the second drill hole are difficult to keep consistent. Therefore, in order to improve the cutting efficiency, the tensioning wheels are arranged between the driving wheel and the driven wheels, the distance between the two driven wheels is adjusted by the first driving component, and the distance between the two tensioning wheels is adjusted by the second driving component, so that the distance between the two guide rods can be changed within a certain range on the premise that the first rope saw chain is kept tensioned, thereby facilitating the cutting of the rock layer and being conducive to improving the construction efficiency. Moreover, since the two driven wheels move towards or away from each other, the distance between the guide rod and the driving wheel will not be changed, so as to adapt to the drilling depth of the first drill hole and the second drill hole.

[0023] Preferably, the first driving component and the second driving component are identical in structure, the first driving component comprises a bidirectional threaded rod and a first driving member for driving the bidirectional threaded rod to rotate, the two ends of the bidirectional threaded rod are threadedly connected with fixed blocks in opposite screw directions, the outer wall of the mounting box is fixedly connected with two parallel guide strips, the guide strips are vertically arranged, the fixed blocks are slidingly arranged between the two guide strips, and the driven wheels are arranged on the fixed blocks; one end of the guide rod is fixedly connected with the fixed block on the first driving component.

[0024] By adopting the above technical scheme, the first driving member drives the bidirectional threaded rod to rotate, the two guide strips guide the fixed blocks, so that the two fixed blocks move towards each other or away from each other, and the distance between the two driven wheels is changed. Similarly, by changing the distance between the two tensioning wheels through the second driving component, the distance between the two guide rods can be changed while the first rope saw chain is kept tensioned, so as to cut the rock stratum.

[0025] Preferably, the end of the guide rod away from the fixed block is fixedly connected with a guide ring, the outer diameter of the guide ring is matched with the hole diameter of the first drill hole and the second drill hole, and the diameter of the reversing wheel is smaller than the inner diameter of the guide ring.

[0026] By adopting the above technical scheme, the guide ring guides the guide rod, so that the guide rod is steadily and gradually inserted into the first drill hole or the second drill hole.

[0027] Preferably, the cutting device comprises a pulling assembly for pulling the second rope saw chain and a winding assembly for winding the second rope saw chain, the pulling assembly comprises a screw rod and a second driving member for driving the screw rod to rotate, a sleeve is sleeved on the screw rod, the screw rod is threadedly connected with the sleeve, the outer diameter of the sleeve is smaller than the hole diameter of the first drill hole and the second drill hole, and a tapered portion is fixedly connected to the end of the sleeve; the screw rod is provided with a third driving assembly for driving the sleeve to rotate relative to the screw rod; the winding assembly comprises a winding drum and a third driving member for driving the winding drum to rotate, the outer diameter of the winding drum is smaller than the hole diameter of the first drill hole and the second drill hole, one end of the second rope saw chain is wound on the sleeve, and the other end of the second rope saw chain is wound on the winding drum.

[0028] When the rock pillar formed after being cut by the rope saw machine needs to be cut off, taking the rock pillar in the middle of the section as an example, the sleeve and the winding drum are inserted into the corresponding second drill holes respectively, and then the second rope saw chain is wound on the rock pillar, and the sleeve is driven to rotate by the third driving assembly to tension the second rope saw chain. Then the second driving member drives the screw rod and the sleeve to rotate synchronously to pull the second rope saw chain, and the third driving member drives the winding drum to rotate to relax the second rope saw chain. During cutting, the winding assembly and the pulling assembly periodically drive the winding drum and the sleeve to rotate forward and reverse, and the second rope saw chain cuts the rock stratum in the process of high-speed movement. At the same time, according to the cutting speed of the second rope saw chain, the sleeve is timely driven to rotate relative to the screw rod by the third driving assembly. Due to the existence of the conical part, the sleeve has the function of drilling, so that the sleeve can rotate relative to the screw rod smoothly, thereby the length of the cutting section of the second rope saw chain can be changed, and the second rope saw chain can be kept tensioned, so as to ensure the cutting efficiency of the cutting device.

[0029] Preferably, the third driving assembly comprises a fixed plate fixed on the rotating rod, the fixed plate is provided with a rotating rod and a fourth driving member for driving the rotating rod to rotate, the rotating rod is parallel to the sleeve, the rotating rod is fixed with a gear, and the sleeve is fixed with a gear ring, the gear ring is engaged with the gear, and the thickness of the gear ring is greater than the thickness of the gear.

[0030] By adopting the above technical scheme, when the second rope saw chain needs to be tensioned, the fourth driving member drives the rotating rod to rotate, the rotating rod drives the gear to rotate, the gear ring and the gear are engaged and transmitted to drive the sleeve to rotate relative to the rotating rod, so as to tension the diamond string rope. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a schematic view of a drill hole in the first drill hole and the second drill hole in the application;

[0032] Figure 2 is a structural schematic view of the rope saw machine in the application;

[0033] Figure 3 is a structural schematic view of the rope saw device in the application;

[0034] Figure 4 is a structural schematic view of the cutting device in the application.

[0035] BRIEF DESCRIPTION OF DRAWINGS:

[0036] 1. First drill hole; 2. Second drill hole; 3. First cutting slit; 4. Second cutting slit; 5. Third cutting slit; 6. Track; 7. Main unit; 8. Wire saw assembly; 81. Mounting box; 82. First wire saw chain; 83. Drive mechanism; 831. Drive wheel; 832. Tensioning wheel; 833. Driven wheel; 834. Guide rod; 835. Reversing wheel; 836. Guide ring; 84. First drive component; 841. Bidirectional threaded rod; 842. Third motor; 843. Fixing block; 844. Guide bar; 85. Second drive component; 9. 91. First drive assembly; 92. First motor; 93. Reciprocating lead screw; 94. Moving seat; 15. Limiting strip; 16. Second motor; 17. Second wire saw chain; 18. Pull-out assembly; 19. Fixed seat; 10. Screw; 11. Fourth motor; 12. Sleeve; 13. Tapered part; 14. Rewinding assembly; 15. Mounting seat; 16. Drum; 17. Fifth motor; 18. Third drive assembly; 19. Fixed plate; 10. Rotating rod; 11. Sixth motor; 12. Gear; 13. Gear ring. Detailed Implementation

[0037] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail.

[0038] This application discloses a construction method for a connecting passage in hard rock strata, which involves excavating the connecting passage in segments, including the following steps:

[0039] S1. Reference Figure 1 After determining the construction location of the connecting passage, a drilling machine is used to drill multiple first boreholes 1 at intervals along the cross-sectional outline of the connecting passage, and multiple second boreholes 2 are drilled inside the cross-sectional outline of the connecting passage.

[0040] Specifically, the first boreholes 1 at the arched outline of the connecting passage are relatively densely arranged, and multiple first boreholes 1 and second boreholes 2 at the rectangular outline of the connecting passage are drilled horizontally and vertically. The drilling depth of the first boreholes 1 and the second boreholes 2 are matched with the length of the single section of the wire saw 6, so that the cross-section of the connecting passage can be cut into sections in the future.

[0041] S2, Reference Figure 1 The first cutting slit 3 is formed by cutting the rock between adjacent first drill holes 1 from the outside in using a wire saw. The second cutting slit 4 is formed by cutting the rock between adjacent second drill holes 2 from the outside in using the wire saw. The third cutting slit 5 is formed by cutting the rock between the first drill hole 1 and the second drill hole 2 from the outside in using the wire saw. During the cutting process, water needs to be poured to cool the first wire saw chain 82.

[0042] Reference Figure 2The rope saw machine comprises a track 6 and a main machine 7 arranged on the track 6, the main machine 7 is provided with a rope saw device 8, a first driving assembly 9 for driving the rope saw device 8 to move in a vertical direction, and a second driving assembly for driving the rope saw device 8 to rotate.

[0043] With reference to Figure 2 The first driving assembly 9 comprises a first motor 91 mounted on the side wall of the main machine 7, and a reciprocating screw rod 92 coaxially fixedly connected to the output shaft of the first motor 91, the reciprocating screw rod 92 is vertically arranged. A screw nut (not shown in the figure) cooperating with the reciprocating screw rod 92 is arranged on the reciprocating screw rod 92, and a moving seat 93 is fixedly connected to the screw nut. One side of the main machine 7 is fixedly connected with two limiting strips 94, and the two limiting strips 94 are vertically arranged. The moving seat 93 is slidably connected between the two limiting strips 94.

[0044] The second driving assembly comprises a second motor 10 mounted on the moving seat 93, and the rope saw device 8 is connected with the output shaft of the second motor 10. By arranging the first driving assembly 9 and the second driving assembly, the height and cutting angle of the rope saw device 8 can be conveniently adjusted, so that the rock stratum can be conveniently cut, and the cutting efficiency can be improved.

[0045] The rope saw device 8 comprises a mounting box 81 fixedly connected with the output shaft of the second motor 10, a first rope saw chain 82 and a driving mechanism 83 for driving the first rope saw chain 82 to rotate are arranged on one side of the mounting box 81, and the first rope saw chain 82 is made of diamond bead rope.

[0046] With reference to Figure 3 The driving mechanism 83 comprises a driving wheel 831 mounted on one side of the mounting box 81, two tensioning wheels 832, and two driven wheels 833, and the power source of the driving wheel 831 is arranged in the mounting box 81. The two tensioning wheels 832 are respectively located on the upper and lower sides of the driving wheel 831, the two driven wheels 833 are respectively located on the upper and lower sides of the driving wheel 831, and the two tensioning wheels 832 are located between the driving wheel 831 and the driven wheel 833. The two driven wheels 833 are connected with guide rods 834, the guide rods 834 are horizontally arranged, one end of the guide rods 834 away from the driven wheels 833 extends in a direction away from the driving wheel 831 and is provided with a reversing wheel 835 and a guide ring 836. The reversing wheel 835 is located between the driven wheel 833 and the guide ring 836, the diameter of the reversing wheel 835 is smaller than the inner diameter of the guide ring 836, and the outer diameter of the guide ring 836 matches the hole diameter of the first borehole 1 and the second borehole 2. The first rope saw chain 82 is wound between the driving wheel 831, the tensioning wheel 832, the driven wheel 833 and the reversing wheel 835, and the first rope saw chain 82 passes from below the tensioning wheel 832 and then passes from above the driven wheel 833.

[0047] When cutting the rock stratum, taking cutting the rock stratum between the first drill holes 1 as an example, first, the main machine 7 and the guide rail are arranged at the corresponding positions, then the height and the cutting angle of the rope saw device 8 are adjusted through the first driving assembly 9 and the second driving assembly, then the two guide rings 836 are inserted into the corresponding two first drill holes 1 until the first rope saw chain 82 abuts against the rock stratum, then the driving wheel 831 is operated to drive the first rope saw chain 82 to rotate, and the first rope saw chain 82 cuts the rock stratum in the process of high-speed movement. According to the cutting speed of the first rope saw chain 82, the main machine 7 automatically moves forward on the guide rail at the corresponding speed, so that the first rope saw chain 82 continuously cuts the rock stratum. When the guide ring 836 moves to abut against the hole bottom of the first drill hole 1, the main machine 7 is reset, and one cutting is completed, so that the first cutting seam 3 is formed. Similarly, the forming processes of the second cutting seam 4 and the third cutting seam 5 are basically the same as that of the first cutting seam 3, and details are not repeated here.

[0048] With reference to Figure 3 In the actual drilling process, under the influence of many factors, the distance between adjacent first drill holes 1, the distance between adjacent second drill holes 2, and the distance between the first drill hole 1 and the second drill hole 2 are difficult to keep consistent, therefore, the first driving component 84 that drives the two driven wheels 833 to move towards or away from each other and the second driving component 85 that drives the two tensioning wheels 832 to move towards or away from each other are arranged on the mounting box 81, so that the first rope saw chain 82 can change the distance between the two guide rods 834 within a certain range while keeping tension, thereby facilitating the cutting of the rock stratum.

[0049] With reference to Figure 3 Specifically, the first driving component 84 includes a bidirectional threaded rod 841 and a first driving piece that drives the bidirectional threaded rod 841 to rotate. The first driving piece is a third motor 842, which is installed on the side of the mounting box 81 where the driven wheel 833 is arranged, and the output shaft of the third motor 842 is coaxially fixedly connected with the bidirectional threaded rod 841. The bidirectional threaded rod 841 is vertically arranged, and the two ends of the bidirectional threaded rod 841 with opposite screw directions are both threadedly connected with a fixed block 843. The side of the mounting box 81 where the third motor 842 is arranged is fixedly connected with two parallel guide strips 844, and the guide strips 844 are vertically arranged. The fixed block 843 is slidingly connected between the two guide strips 844. The side of the fixed block 843 away from the mounting box 81 is perpendicularly fixedly connected with a fixed rod, and the driven wheel 833 is rotatably sleeved on the fixed rod. The end of the guide rod 834 away from the guide ring 836 is perpendicularly fixedly connected with the fixed rod.

[0050] The structure of the second driving component 85 is consistent with that of the first driving component 84, and details are not repeated here.

[0051] When the distance between the two guide rods 834 needs to be adjusted to adapt to the distance between the drill holes, the two driven wheels 833 are driven by the first driving part 84 to move towards each other or away from each other, and the two tensioning wheels 832 are correspondingly driven by the second driving part 85 to relax or tighten the first rope saw chain 82.

[0052] S4, the rock pillar formed after being cut by the rope saw machine is cut off by the cutting device. During the cutting process, water needs to be poured to cool the second rope saw chain 11. The cutting order of the rock pillar is from top to bottom to ensure construction safety. After cutting is completed, the rock pillar is taken out by the hydraulic cylinder, and then the rock pillar is transported away by the transport vehicle. Since the rock pillar is relatively intact, it can be reused and has high economic value.

[0053] Referring to Figure 4 , specifically, the cutting device comprises a pulling assembly 12 for pulling the second rope saw chain 11 and a winding assembly 13 for winding the second rope saw chain 11, and the second rope saw chain 11 is a diamond bead rope.

[0054] Referring to Figure 4 , the pulling assembly 12 comprises a fixed seat 121 and a screw rod 122 arranged on the fixed seat 121, and the fixed seat 121 is provided with a second driving part for driving the screw rod 122 to rotate. The second driving part is a fourth motor 123 mounted on the fixed seat 121, and one end of the screw rod 122 penetrates the fixed seat 121 and is fixedly connected with the output shaft of the fourth motor 123. A sleeve 124 is sleeved on the screw rod 122, the sleeve 124 is provided with an internal thread, and the screw rod 122 is threadedly connected with the sleeve 124. The outer diameter of the sleeve 124 is smaller than the hole diameter of the first drill hole 1 and the second drill hole 2, and one end of the sleeve 124 away from the fixed seat 121 is fixedly connected with a conical part 125. The conical part 125 is composed of a plurality of arc-shaped pieces which are circumferentially distributed with the axis of the sleeve 124 as the center. The screw rod 122 is provided with a third driving assembly 14 for driving the sleeve 124 to rotate relative to the screw rod 122.

[0055] Referring to Figure 4 , the winding device comprises a mounting seat 131 and a winding drum 132 arranged on the mounting seat 131, and the mounting seat 131 is provided with a third driving part for driving the winding drum 132 to rotate. The outer diameter of the winding drum 132 is consistent with the outer diameter of the sleeve 124, and the length of the winding drum 132 is smaller than the length of the sleeve 124. The third driving part is a fifth motor 133 mounted on one side of the mounting seat 131, and one end of the winding drum 132 penetrates the mounting seat 131 and is fixedly connected with the output shaft of the fifth motor 133. One end of the second rope saw chain 11 is wound on the sleeve 124, and the other end of the second rope saw chain 11 is wound on the winding drum 132.

[0056] When cutting the rock pillar, the rock pillar in the middle of the cutting connecting passage section is taken as an example. A support with a proper height is built in the tunnel to fix the mounting seat 131 and the mounting seat 121. Then, the sleeve 124 and the winding drum 132 are respectively inserted into the corresponding second drill hole 2, and then the second rope saw chain 11 is sleeved on the rock pillar. The sleeve 124 is driven to rotate by the third driving assembly 14 to tension the second rope saw chain 11. Then, the sleeve 124 and the winding drum 132 are periodically controlled to rotate in opposite directions by the fourth motor 123 and the fifth motor 133, and the second rope saw chain 11 moves at a high speed in the process to cut the rock pillar. In the cutting process, according to the cutting speed of the second rope saw chain 11, the third driving assembly 14 periodically drives the sleeve 124 to rotate relative to the rotating rod 142, so as to gradually shorten the length of the cutting section of the second rope saw chain 11, so that the second rope saw chain 11 is always tensioned, so as to improve the cutting efficiency. In this process, due to the existence of the tapered portion 125, the sleeve 124 has the function of drilling, so that the sleeve 124 can rotate relative to the rotating rod 142 more easily. The cutting process of the rock pillar at other positions is consistent with the above cutting process, which will not be described here.

[0057] Referring to Figure 2 Specifically, the third driving assembly 14 includes a fixed plate 141 fixedly sleeved on one end of the screw rod 122 close to the fourth motor 123, and the fixed plate 141 is provided with a rotating rod 142 and a fourth driving piece for driving the rotating rod 142 to rotate. The fourth driving piece is a sixth motor 143 installed on the fixed plate 141, and the sixth motor 143 is a motor with a built-in battery. The axis of the rotating rod 142 is parallel to the axis of the sleeve 124, one end of the rotating rod 142 is fixedly connected with the output shaft of the sixth motor 143, the other end of the rotating rod 142 is fixedly connected with a gear 144, one end of the sleeve 124 close to the mounting seat 121 is fixedly sleeved with a gear ring 145, the gear ring 145 is in meshing transmission with the gear 144, and the thickness of the gear ring 145 is greater than the thickness of the gear 144. The sixth motor 143 is operated to drive the rotating rod 142 to rotate, the gear 144 is in meshing transmission with the gear ring 145 to drive the sleeve 124 to rotate relative to the screw rod 122, and since the thickness of the gear ring 145 is greater than the thickness of the gear 144, the gear 144 and the gear ring 145 can remain in meshing transmission in the process that the sleeve 124 moves along the axial direction.

[0058] S4, clean the rock slag.

[0059] S5, repeat the steps S1-S4 until the first drill hole 1 and the second drill hole 2 pass through the other side tunnel of the connecting passage. After that, the connecting passage is cut in regions by using the rope saw machine, and then the rock pillar is removed.

[0060] S6, trim the side wall and arch wall of the connecting passage.

[0061] S7, installing the steel frame, the steel mesh and the longitudinal connecting steel bars of the steel frame in the communication passage, and then spraying the primary support concrete to complete the excavation of the communication passage.

[0062] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, so: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A method for constructing a connecting passage within hard rock strata, characterized in that: The connecting passage will be excavated in sections, including the following steps: S1. Drill multiple first holes (1) at intervals along the cross-sectional outline of the connecting channel, and drill multiple second holes (2) inside the cross-sectional outline. The drilling depth of the first holes (1) and the second holes (2) are matched with the length of the single section track (6) of the wire saw. S2. Use a wire saw to cut the rock between adjacent first boreholes (1) from the outside to the inside to form a first cutting seam (3), use a wire saw to cut the rock between adjacent second boreholes (2) from the outside to the inside to form a second cutting seam (4), and use a wire saw to cut the rock between the first borehole (1) and the second borehole (2) from the outside to the inside to form a third cutting seam (5). The wire saw includes a track (6) and a host (7) mounted on the track (6). The host (7) is provided with a wire saw device (8), a first drive component (9) that drives the wire saw device (8) to move in the vertical direction, and a second drive component that drives the wire saw device (8) to rotate. The wire saw device (8) includes a first wire saw chain (82) and a drive mechanism (83) for driving the first wire saw chain (82) to rotate. The drive mechanism (83) includes a mounting box (81), a drive wheel (831) mounted on the mounting box (81), and two driven wheels (833). The two driven wheels (833) are respectively distributed on the upper and lower sides of the drive wheel (831). The driven wheel (833) is connected to a guide rod (834). A reversing wheel (835) is provided at the end of the guide rod (834) away from the driven wheel (833). The first wire saw chain (82) is sleeved between the drive wheel (831), the driven wheel (833), and the reversing wheel (835). The drive mechanism (83) further includes two tension wheels (832), which are disposed between the drive wheel (831) and the driven wheel (833). The two tension wheels (832) are respectively distributed on the upper and lower sides of the drive wheel (831). The first wire saw chain (82) passes between the two tension wheels (832). The mounting box (81) is provided with a first drive component (84) that drives the two driven wheels (833) to move in opposite directions and a second drive component (85) that drives the two tension wheels (832) to move in opposite directions. S3. Use a cutting device to cut the rock columns formed by the wire saw one by one, and then remove the rock columns. The cutting device includes a pulling assembly (12) for pulling the second wire saw chain (11) and a winding assembly (13) for winding the second wire saw chain (11). The pulling assembly (12) includes a screw (122) and a second driving member for driving the screw (122) to rotate. A sleeve (124) is sleeved on the screw (122). The screw (122) and the sleeve (124) are threaded together. The outer diameter of the sleeve (124) is smaller than the diameter of the first drill hole (1) and the second drill hole (2). A tapered part (125) is fixedly connected to the end of the sleeve (124). A third driving assembly (14) is provided on the screw (122) for driving the sleeve (124) to rotate relative to the screw (122). The winding assembly (13) includes a drum (132) and a third drive member for driving the drum (132) to rotate. The outer diameter of the drum (132) is smaller than the diameter of the first drill hole (1) and the second drill hole (2). One end of the second wire saw chain (11) is wound around the sleeve (124), and the other end of the second wire saw chain (11) is wound around the drum (132). S4. Clean up rock debris; S5. Repeat steps S1-S4 until the first borehole (1) and the second borehole (2) penetrate the tunnel on the other side of the connecting passage; thereafter, use a wire saw to cut the connecting passage into sections, and then remove the rock pillars. S6. Repair the side walls and arches of the connecting passageway; S7. Install the arch wall steel frame, steel mesh and longitudinal connecting steel bars in the connecting passage, and then spray the initial support concrete to complete the excavation of the connecting passage.

2. The construction method for a connecting passage within hard rock strata according to claim 1, characterized in that: The first driving component (84) and the second driving component (85) have the same structure. The first driving component (84) includes a bidirectional threaded rod (841) and a first driving member that drives the bidirectional threaded rod (841) to rotate. The two ends of the bidirectional threaded rod (841) with opposite thread directions are threaded to a fixing block (843). The outer wall of the mounting box (81) is fixedly connected to two parallel guide bars (844). The guide bars (844) are vertically arranged. The fixing block (843) is slidably arranged between the two guide bars (844). The driven wheel (833) is arranged on the fixing block (843). One end of the guide rod (834) is fixedly connected to the fixing block (843) located on the first driving component (84).

3. The construction method for a connecting passage within hard rock strata according to claim 2, characterized in that: The guide rod (834) is fixedly connected to a guide ring (836) at one end away from the fixed block (843). The outer diameter of the guide ring (836) is adapted to the diameter of the first drill hole (1) and the second drill hole (2). The diameter of the reversing wheel (835) is smaller than the inner diameter of the guide ring (836).

4. The construction method for a connecting passage within hard rock strata according to claim 1, characterized in that: The third drive assembly (14) includes a fixing plate (141) sleeved and fixed on the rotating rod (142). The fixing plate (141) is provided with the rotating rod (142) and a fourth drive member for driving the rotating rod (142) to rotate. The rotating rod (142) is parallel to the sleeve (124). A gear (144) is fixed on the rotating rod (142). A gear ring (145) is sleeved and fixed on the sleeve (124). The gear ring (145) meshes with the gear (144). The thickness of the gear ring (145) is greater than the thickness of the gear (144).

Images