A quick positioning drilling system and method for curtain grouting in a small cross-section tunnel

Abstract

The present invention discloses a curtain grouting rapid positioning drilling system for small-section tunnels, comprising: a horizontal movement system, a vertical displacement system and a horizontal rotation system, wherein: the horizontal movement system is used to be arranged on the ground behind the excavation surface in the tunnel; the vertical displacement system can move left and right along the horizontal movement system; there are four columns, which are correspondingly arranged vertically at the four top corners of the base; there are four load-bearing lock bars, which are respectively erected between two adjacent columns, and the heights of two adjacent load-bearing lock bars are not equal, while the heights of two opposite load-bearing lock bars are equal, and the four load-bearing lock bars form a two-layer structure with adjustable positions in the vertical direction; a drill rig platform is erected on the upper-layer load-bearing lock bars, and a down-the-hole drill rig is placed on the drill rig platform; a lifting platform is erected on the lower-layer load-bearing lock bars; a jack is used to push up the drill rig platform. By adopting the rapid positioning drilling system, the functions of rapid assembly, rapid positioning and drilling in small-section tunnels are realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of tunnel engineering construction, and particularly relates to a quick positioning drilling system and method for curtain grouting in a small cross-section tunnel. Background Technique

[0002] During the construction of underground projects, when encountering soft and poor strata, the application of curtain grouting technology is becoming more and more common. However, in an increasing number of small tunnel projects, such as tunnels constructed by the CRD method, subway connection passages, water conveyance culverts, pipeline utility tunnels, etc., the tunnel diameter is usually about 3-5m. Conventional crawler drills are restricted by space and cannot operate normally, posing a huge challenge to the grouting construction efficiency and progress.

[0003] When performing curtain grouting in a conventional small cross-section tunnel, small equipment such as shaft drills and down-the-hole drills is used, and an operation platform is built on the excavation surface. However, even for small drills, their weight exceeds 2t, making it difficult for manpower to move them. It is necessary to cooperate with lever crowbars to move horizontally on the platform. After drilling holes of approximately the same height, part of the platform is removed and rebuilt, and a pulley block is used for manual lifting.

[0004] Due to the large number of curtain grouting holes and the different orifice positions and spatial angles of each hole, the construction method of fixing the drill height on the platform results in a large drilling positioning error; moreover, the method of partially removing and reconstructing the platform further reduces the construction efficiency. Therefore, the number of times of adjusting the platform per cycle is about 3-5 times, which also leads to serious insufficient vertical positioning accuracy of the drilling. Summary of the Invention

[0005] The purpose of the present invention is to provide a quick positioning drilling system and method for curtain grouting in a small cross-section tunnel, realizing the functions of quick assembly, quick positioning, and drilling in a small cross-section tunnel.

[0006] The present invention adopts the following technical solutions: A quick positioning drilling system for curtain grouting in a small cross-section tunnel, comprising: a horizontal movement system, a vertical displacement system, and a horizontal rotation system, wherein:

[0007] The horizontal movement system is used to be arranged on the ground behind the excavation surface in the tunnel;

[0008] The vertical displacement system includes: columns, a base, load-bearing lock bars, a lifting platform, a jack, and a drill platform, wherein:

[0009] The base is a plate body, horizontally placed on the horizontal movement system and can move left and right along the horizontal movement system;

[0010] The columns are four, vertically arranged at the four top corners of the base correspondingly,

[0011] There are four load-bearing lock bars, which are respectively erected between two adjacent columns in one-to-one correspondence. The heights of two adjacent load-bearing lock bars are different, and the heights of two opposite load-bearing lock bars are equal. The four load-bearing lock bars form a two-layer structure with adjustable positions in the vertical direction.

[0012] The drilling rig platform is a plate body, which is horizontally arranged and erected on the upper load-bearing lock bars. The drilling rig platform is used to place the down-the-hole drilling rig.

[0013] The lifting platform is a plate body, which is horizontally arranged and erected on the lower load-bearing lock bars.

[0014] The jack is vertically arranged on the lifting platform, and its upper end is in contact with the drilling rig platform. It is used to push the drilling rig platform upward and also support the drilling rig platform when the drilling rig platform changes its position in the vertical direction.

[0015] Furthermore, the load-bearing lock bars are all channel steel bodies, and the open sides of each channel steel body face outward. At both ends of the channel steel body, there are clamping sleeves that are connected up and down, which are used to clamp and fix on two adjacent columns.

[0016] Each clamping sleeve is a cubic columnar shell, and its back plate is integrally connected to the web of the load-bearing lock bar. The outside of the clamping sleeve is provided with an openable structure, which is fixed or opened by a fixing member.

[0017] Furthermore, the lengths of the two side plates of the clamping sleeve are greater than the width of the column. There are two insertion holes on each side plate, and the distance between each insertion hole and the back plate is the same as the width of the column. On each side plate, the two insertion holes are arranged vertically at intervals, which are used to insert the fixing members, and the fixing members are two insertion steel bars.

[0018] Furthermore, the vertical displacement system further includes a cushion strip. The cushion strip is a long strip-shaped plate body. There are up-and-down connected and outwardly open grooves at both ends of the plate body. The cushion strip is located between the load-bearing lock bar and the drilling rig platform, and the grooves at both ends are clamped on the adjacent columns. The cushion strip is used to finely adjust the height of the drilling rig platform.

[0019] Furthermore, the vertical displacement system further includes a limit lock bar. The limit lock bar is a channel steel body, and there are second clamping sleeves that are connected up and down at both ends. The second clamping sleeve is a cubic shape that is connected up and down, which is used to sleeved on the column, and its side facing the outside of the column is open; on the side plate of the second clamping sleeve that encloses the opening, and near the outer end, there are second insertion holes, and the second insertion rods are used to insert into the second insertion holes, and the second insertion rods are used to fix each limit lock bar on two adjacent columns.

[0020] Further, two columns located at the same end of the base are grouped together. In each group, a plurality of square blocks are provided on the wall surfaces of the opposite sides of the two columns. The plurality of square blocks are spaced along the length direction of each column and are arranged in a zigzag pattern on each column. Each square block is used to carry the load-bearing lock bar and the limit lock bar, and the distance between adjacent square blocks is consistent with the size of the outer contour of the clamping sleeve.

[0021] Further, the horizontal rotation system includes: a gear fixed disk, a drilling rig turntable, a fixed pin block, and an auxiliary bolt, where:

[0022] The gear fixed disk is a circular steel disk fixed on the drilling rig platform. A first rectangular groove is opened at intervals around the circumferential circle. The first rectangular groove is used to insert the fixed pin block.

[0023] The drilling rig turntable is a circular steel disk coaxially stacked on the gear fixed disk. Its diameter is slightly smaller than that of the gear fixed disk and can rotate around the circle. Four second rectangular grooves are opened at equal intervals along its edge and around it. When the second rectangular groove and the first rectangular groove are on the same radius, the fixed pin block is inserted into both of them.

[0024] The auxiliary bolts are spaced around the drilling rig turntable and fixed to the drilling rig turntable. They can rotate horizontally together with the drilling rig turntable and are used to fix the down-the-hole drill on the drilling rig turntable.

[0025] Further, a diagonal bracing system is also provided in the tunnel to provide lateral support force;

[0026] The diagonal bracing system includes a hydraulic telescopic rod, a platform limit push rod, a foundation limit push rod, a planar rotating collar, and a vertical rotating joint, where:

[0027] There are two foundation limit push rods, both of which are circular steel columns located on the ground on the side of the horizontal movement system away from the excavation face and arranged at intervals left and right; the distance between each foundation limit push rod and the vertical displacement system is greater than the maximum height of the vertical displacement system;

[0028] The platform limit push rods are two steel columns vertically arranged on the side of the drilling rig platform 28 away from the excavation face and arranged at intervals left and right;

[0029] There are two hydraulic telescopic rods, which are circular-section hydraulic sleeve rods, corresponding one by one, and are connected between the foundation limit push rod and the platform limit push rod;

[0030] Both ends of each hydraulic telescopic rod are connected with a vertical rotating joint. The vertical rotating joint is a U-shaped shell connected up and down, and connection holes are opened on both arms. A steel pin is inserted into the connection hole.

[0031] Further, the horizontal movement system includes: a cushion block, a track, a roller, and a stopper, where:

[0032] There are two tracks, which are arranged in parallel at intervals and located at the rear side of the excavation face. Each track is arranged in the left-right direction.

[0033] There are multiple cushion blocks, all of which are strip-shaped bodies made of wood or stone. The multiple cushion blocks are parallel to each other and arranged at intervals. Each cushion block is located below the track and fixed to the ground. Each cushion block straddles two tracks.

[0034] There are two pairs of rollers. One pair is connected by a wheel shaft and arranged on the track.

[0035] The limiter is sleeved on the track by a hook claw. A limit baffle is arranged on the side close to the roller, which is used to block the movement of the roller along the direction.

[0036] The present invention also discloses a positioning drilling method for the above-mentioned curtain grouting rapid positioning drilling system of a small-section tunnel. The method is as follows:

[0037] Vertical positioning: Install the drill bit and drill pipe on the down-the-hole drill. Adjust the down-the-hole drill and adjust the vertical angle of the rotating drill bit and drill pipe to the designed angle and lock it.

[0038] Adjust the horizontal rotation system: Rotate the drill rig turntable, and the down-the-hole drill rotates with it. Rotate to the horizontal designed angle of the drilling hole. Insert four fixing pin blocks into the first rectangular groove and the second rectangular groove on the same radius respectively. The down-the-hole drill and the drill rig turntable are stuck with the gear fixed plate to complete the fixation of the horizontal drilling angle.

[0039] Adjust the horizontal movement system: Loosen the limiter and slide the four limiters to the tracks on both sides; Push the entire vertical gantry to move horizontally along the track to the set position. Slide the four limiters to the four rollers and closely attach to the rollers. Lock the limiter to lock the horizontal position to be consistent with the design parameters.

[0040] Adjust the vertical movement system: Reset the jacking height of the jack. Lift the lifting platform and the jack so that the jack is close to the bottom of the drill rig platform. Near the bottom height of the lifting platform, install a pair of load-bearing lock bars and lock them; Raise the jack and continuously jack up the drill rig platform. After reaching the limit height of the jack, install a pair of load-bearing lock bars below the drill rig platform and close to its limit height, and the load-bearing lock bars are located on two opposite sides of the drill rig platform; Slowly lower the jacking height of the jack so that the drill rig platform gently lands on the load-bearing lock bars; And use multiple pairs of cushion bars to pad between the drill rig platform and the load-bearing lock bars to accurately adjust the height of the drill rig platform and lock the vertical position to be consistent with the design parameters.

[0041] Adjust the lengths of the two hydraulic telescopic rods: Sleeve the connecting plane rotating collars at both ends of the hydraulic telescopic rod on the platform limit push rod and the foundation limit push rod respectively to provide horizontal support force for the drill rig platform.

[0042] After drilling and grouting, position and drill the next hole.

[0043] The beneficial effects of the present invention are as follows: 1. It can be quickly assembled in a small-section tunnel. Horizontal positioning is achieved through the movement of the horizontal movement system. The vertical displacement system can adjust the height of the drill rig platform without limitation to meet the determination of the vertical position. With the help of a down-the-hole drill, the vertical angle of the drill bit and drill pipe can be precisely adjusted to meet the rapid positioning and drilling functions of a large number of holes in curtain grouting construction. 2. By using the vertical displacement system, the jack is used as the support for the rise and fall of the drill rig platform, and the limit lock bar is used for support and positioning to fix the drill rig platform, realizing the adjustment of the position of the drill rig platform in the vertical direction. 3. The rapid positioning drilling system can be reused. Description of the Drawings

[0044] Figure 1 It is a schematic diagram of a rapid positioning drilling system for curtain grouting in a small-section tunnel;

[0045] Figure 2 It is a schematic diagram of the horizontal movement system;

[0046] Figure 3 It is a schematic diagram of the vertical displacement system (I);

[0047] Figure 4 It is a schematic diagram of the vertical displacement system (II);

[0048] Figure 5 It is a schematic diagram of the vertical displacement system (III);

[0049] Figure 6 It is a schematic diagram of the diagonal bracing system;

[0050] Figure 7 It is a schematic diagram of the horizontal rotation system;

[0051] Figure 8 It is a schematic diagram of the vertical displacement system;

[0052] Among them: 1. Horizontal movement system; 2. Vertical movement system; 3. Diagonal bracing system; 4. Horizontal rotation system; 5. Vertical rotation system;

[0053] 11. Cushion block; 12. Rail; 13. Roller; 14. Limiter;

[0054] 21. Column; 22. Base; 23. Load-bearing lock bar; 24. Limit lock bar; 25. Cushion strip; 26. Lifting platform; 27. Jack; 28. Drill rig platform;

[0055] 31. Hydraulic telescopic rod; 32. Platform limit push rod; 33. Foundation limit push rod; 34. Plane rotation collar; 35. Vertical rotation joint;

[0056] 41. Gear fixed disk; 42. Rotary table of drilling rig; 43. Fixed pin block; 44. Auxiliary bolt;

[0057] 51. DTH drilling rig; 52. Drill bit and drill pipe. Specific implementation manner

[0058] The present invention will be described in detail below with reference to the accompanying drawings and specific implementation manners.

[0059] A curtain grouting rapid positioning drilling system for small cross-section tunnels of the present invention, as Figure 1 shown, includes a horizontal movement system 1, a vertical displacement system 2 and a horizontal rotation system 4. Among them:

[0060] As Figure 2 shown, the above-mentioned horizontal movement system 1 includes: a cushion block 11, a track 12, a roller 13 and a stopper 14; among them, there are two tracks 12, which are arranged in parallel at intervals and are located at the rear side of the excavation surface. Each track 12 is arranged in the left-right direction, and each track 12 is axially connected and spliced in sequence by a plurality of I-beam rails. The length of the I-beam rail is 1m for each section, which is convenient for flexible splicing and manual handling.

[0061] There are multiple cushion blocks 11, all of which are strip-shaped bodies made of wood or stone. The size specifications are not limited. The multiple cushion blocks 11 are parallel to each other and arranged at intervals. Each cushion block 11 is located below the track 12 and fixed to the ground. Each cushion block 11 straddles two tracks 12 and is perpendicular to each track 12. The cushion block 1 is used to keep the track 12 horizontal.

[0062] The roller 13 is a steel wheel. There are two pairs of rollers. One pair of rollers is connected by a wheel axle and arranged on the track 12. The inner and outer edges of the roller 13 in the transverse direction are enlarged in diameter. The width between the inner and outer edges matches the upper surface of the track 12, which is used to limit the transverse displacement of the roller 13 so that it can only move longitudinally in the horizontal direction along the track;

[0063] The stopper 14 is sleeved on the upper surface of the track 12 through a hook claw. It can slide along the track by loosening the fastening bolt and can be fixed on the track 12 by tightening the fastening bolt. The roller 13 is blocked from moving along the track direction by a stopper baffle on one side;

[0064] As Figure 3 、 4 and shown in 5, the vertical displacement system 2 includes: a column 21, a base 22, a load-bearing lock bar 23, a limit lock bar 24, a cushion bar 25, a lifting platform 26, a jack 27 and a drilling rig platform 28. Among them:

[0065] The base 22 is a square steel plate with a side length of 1.2 - 1.5m. A roller bracket is welded below the steel plate and connected to the wheel axle of the roller 13. Four square holes are provided at the four corners of the steel plate for inserting and fixing the column 21.

[0066] There are four vertical columns 21, which are vertically arranged at the four top corners of the base 22. Each vertical column 21 is connected by multiple sections of steel columns. Except for the bottom steel column, each of the other sections of steel columns can slide up and down within the adjacent steel columns to achieve elevation or depression in the vertical direction. Each steel column is hollow and has a square cross-section. At the bottom end of each section of steel column, a plug head is fixed. The cross-sectional area of the plug head is the same as the hollow cross-sectional area of the steel column itself. Adjacent two sections of steel columns can be connected end to end by inserting the plug head; it is convenient to flexibly set according to the size of the tunnel cross-section. Each section of the steel column can be set to 1 m in length and 10 cm in side length.

[0067] There are four load-bearing lock bars 23, all of which are channel steel bodies. They are respectively arranged between adjacent two vertical columns 21 in one-to-one correspondence. The heights of adjacent two load-bearing lock bars 23 are not equal, and the heights of opposite two load-bearing lock bars 23 are equal, forming a two-layer structure in the vertical direction.

[0068] The opening sides of each channel steel body face outward. At both ends of the channel steel body, clamping sleeves are provided for clamping and fixing on adjacent two vertical columns.

[0069] Each of the clamping sleeves is a cubic columnar shell. Its back side plate is integrally connected with the web of the load-bearing lock bar 23. On the vertical plate at the end of the clamping sleeve far from the channel steel body, two insertion holes are spaced up and down. The side located on the outside can be opened and closed and is fixed by fixing parts. The fixing parts include: two fixing plates and two insertion steel bars. Among them, the two fixing plates are located at the end close to the channel steel body, facing and perpendicular to the web from the outside. At the outer end of each fixing plate, a fixing hole is opened; the positions of the two fixing holes correspond to the insertion holes for inserting and fixing the insertion steel bars.

[0070] The two vertical columns 21 at the same end of the base 22 form a group. In each group, a plurality of square blocks are arranged on the opposite side walls of the two vertical columns 21. The plurality of square blocks are spaced along the length direction of each vertical column 21 and are arranged in a zigzag shape on each vertical column 21. Each square block is used to carry the load-bearing lock bar 23. The distance between adjacent square blocks is consistent with the outer contour size of the clamping sleeve. The side length of each square block can be set to 5 cm, and the distance between adjacent two square blocks is set to 5 cm.

[0071] The limiting lock bar 24 is a channel steel body. At both ends of it, clamping sleeves that are connected up and down are provided. The clamping sleeves are cube-shaped and connected up and down, and are used to sleeved on the vertical column 24. The side facing the outside of the vertical column 24 is open; on the side plate of the clamping sleeve that encloses the opening and close to the outer end, insertion holes are opened. Insertion rods are inserted into the insertion holes to fix each limiting lock bar 24 on adjacent two vertical columns 21, playing a role in supporting and stabilizing the vertical column 21.

[0072] The drilling rig platform 28 is a square thick steel plate with the four corners cut off by squares with a side length of 5 cm. It is horizontally arranged and erected on the upper load-bearing lock bar 23, enabling it to freely move up and down within the four columns 21. At the same time, after being locked, it can also limit the position of the columns 21, making the entire bench more stable;

[0073] The cushion bar 25 is a strip-shaped steel bar with U-shaped openings at both ends facing the side of the column 21. It is used to be clamped on the column 21 and is arranged between the load-bearing lock bar 23 and the drilling rig platform 28 for finely adjusting the height of the drilling rig platform 28.

[0074] The lifting platform 26 is a square thick steel plate. It is horizontally arranged and erected on the lower load-bearing lock bar 23, located below the drilling rig platform 28. The four corners are cut off by squares with a side length of 5 cm, enabling it to freely move up and down within the four columns 21. After being locked, it can also limit the position of the columns 21, making the entire bench more stable;

[0075] The jack 27 is arranged on the lifting platform 26, and its upper end is used to push the drilling rig platform 28 upward;

[0076] As Figure 6 shown, the diagonal bracing system 3 includes: a hydraulic telescopic rod 31, a platform limiting push rod 32, a foundation limiting push rod 33, a planar rotating collar 34, and a vertical rotating joint 35;

[0077] Among them, there are two foundation limiting push rods 33, both of which are circular steel columns located on the ground on the side of the track 12 away from the excavation surface, and the implanted depth into the ground is not less than 1 m; the distance between the foundation limiting push rods 33 and the overall system is not less than the maximum height of the system, so that the maximum vertical angle of the diagonal bracing system 3 does not exceed 45 degrees to provide better horizontal support force;

[0078] The platform limiting push rod 3 is two steel columns vertically arranged on the side of the drilling rig platform 28 away from the excavation surface and are spaced apart.

[0079] There are two hydraulic telescopic rods 31, which are circular cross-section hydraulic sleeve rods. They are in one-to-one correspondence and are connected between the foundation limiting push rod 33 and the platform limiting push rod 3; each hydraulic telescopic rod 31 can adjust the telescopic length of the rod through a hydraulic system, and the rod body has good stiffness and can provide good support force;

[0080] Both ends of each hydraulic telescopic rod 31 are connected with a vertical rotating joint 35. The vertical rotating joint 35 is a U-shaped shell that is connected up and down, and connection holes are opened on both arms. A steel pin is inserted into the connection hole;

[0081] There are two planar rotary collars 34, both of which are toroidal bodies, and the outer contour of the toroidal body is in the shape of a water droplet. A through hole is horizontally opened at the small head end for inserting a steel pin to connect with the pin rod of the vertical rotary joint 35. One planar rotary collar 34 is connected to one vertical rotary joint 35, and one planar rotary collar 34 is sleeved on the foundation limit push rod 33 and connected to the planar rotary collar 34 at this end through a steel pin, enabling the two to rotate freely horizontally; the other planar rotary collar 34 is sleeved on the platform limit push rod 32 and connected to the planar rotary collar 34 at this end through a steel pin, enabling the planar rotary collar 34 to rotate freely relative to the hydraulic telescopic rod 31 in the vertical direction;

[0082] As Figure 7 and 8 shown, the horizontal rotation system 4 includes: a gear fixed disk 41, a drill rig rotary table 42, a fixed pin block 43, and an auxiliary bolt 44;

[0083] Among them, the gear fixed disk 41 is a circular steel disk fixed on the drill rig platform 28, with first rectangular grooves opened at intervals around the circumferential circle. The first rectangular grooves are used for inserting the fixed pin block 43;

[0084] The drill rig rotary table 42 is a circular steel disk coaxially stacked on the gear fixed disk 41. Its diameter is slightly smaller than that of the gear fixed disk 41 and it can rotate around the circle. Four second rectangular grooves are opened at equal intervals along its edge and around it. That is, the adjacent two second rectangular grooves are spaced 90 degrees apart. When the second rectangular groove and the first rectangular groove are on the same radius, the fixed pin block 43 is inserted into both of them.

[0085] The auxiliary bolts 44 are fixed on the drill rig rotary table 42 at intervals of 90 degrees and can rotate horizontally together with the drill rig rotary table 42, and are used to assist in fixing the down-the-hole drill 51 on the drill rig rotary table 42;

[0086] The vertical rotation system 5 includes: a down-the-hole drill 51 and a drill bit and drill pipe 52;

[0087] The down-the-hole drill 51 is a mature device that has been applied in the market for many years. After the angle can be freely set 360 degrees in the vertical direction, the angle is fixed for drilling.

[0088] The present invention also discloses a positioning drilling method for the above-mentioned curtain grouting rapid positioning drilling system for small-section tunnels, and the method is as follows:

[0089] Vertical positioning: Install the drill bit and drill pipe (52) on the down-the-hole drill (51), adjust the down-the-hole drill (51), and adjust the vertical angle of the rotating drill bit and drill pipe to the designed angle and lock it;

[0090] Adjust the horizontal rotation system 4: Rotate the rotary table 42 of the drill rig, and the down-the-hole drill rig 51 rotates with it. Rotate it to the horizontal design angle of the drill hole. Insert the four fixed pin blocks 43 into the first rectangular groove and the second rectangular groove on the same radius respectively. The down-the-hole drill rig 51 and the rotary table 42 of the drill rig are stuck with the gear fixed plate 41 to complete the fixation of the horizontal drill hole angle.

[0091] Adjust the horizontal movement system 1: Loosen the limiters 14, and slide the four limiters 14 to the tracks 12 on both sides; Push the entire vertical gantry so that it moves horizontally along the tracks 12 to the set position. Slide the four limiters 14 to the four rollers 13 and press closely against the rollers 13. Lock the limiters 14 to lock the horizontal position to be consistent with the design parameters.

[0092] Adjust the vertical movement system 2: Reset the lifting height of the jack 27. Lift the lifting platform 26 and the jack 27 so that the jack abuts against the bottom of the drill rig platform 28. Near the bottom height of the lifting platform 26, install a pair of load-bearing lock bars 23 and lock them; Raise the jack 27, continuously lift the drill rig platform 28 upwards. After reaching the limit height of the jack 27, install a pair of load-bearing lock bars 23 below the drill rig platform 28 and near its limit height and lock them. The load-bearing lock bars 23 are located on two opposite sides of the drill rig platform 28; Slowly lower the lifting height of the jack so that the drill rig platform 28 gently lands on the load-bearing lock bars 23; And use multiple pairs of cushion bars 25 to pad between the drill rig platform 28 and the load-bearing lock bars 23 to accurately adjust the height of the drill rig platform 28 and lock the vertical position to be consistent with the design parameters.

[0093] Adjust the lengths of the two hydraulic telescopic rods 31: Put the connecting plane rotating sleeves 34 at both ends of the hydraulic telescopic rods 31 on the platform limit push rod 33 and the foundation limit push rod 34 respectively to provide horizontal support force for the drill rig platform 28.

[0094] Drill and grout. After completion, carry out the positioning and drilling of the next hole position.

[0095] The assembly process of the curtain grouting rapid positioning drilling system for a small-section tunnel is as follows:

[0096] S1: Assemble the horizontal movement system 1:

[0097] Level the site and lay multiple cushion blocks 11. The laying range of the multiple cushion blocks 11 is the ground width at the tunnel excavation surface; Lay a section of track 12 on both sides of the cushion blocks 11, and the two tracks 12 are parallel. Adjust the distance between the two tracks 12 and fix the tracks 12 on the cushion blocks 11 to form an integral body.

[0098] Continue to lay the next section of parallel track 12. After smoothly connecting and aligning it with the previous section, fix it on the cushion blocks 11 until the track length is basically equal to the ground width at the tunnel excavation surface.

[0099] Take four rollers 13, two by two as a pair, forming two pairs of roller sets, place them on the track 12, from both sides of each track 12, insert a relative position limiter 14 respectively, a total of four position limiters are installed, and clamp the roller sets in the middle;

[0100] S2: Assemble the vertical movement system 2:

[0101] Assemble the base 22 and the two pairs of rollers 13 into one body. Take four columns 21, insert the pin heads into the reserved square holes at the four corners of the base. The column teeth of the columns 21 are located on the two side edges in the horizontal movement direction of the base, facing each other in pairs;

[0102] Install 2 load-bearing lock bars 23 at the same height in the middle and lower sections of the columns 21 and lock them tightly. Place the horizontal lifting platform 26 on the load-bearing lock bars 23, place the vertical jack 27 on the lifting platform 26, and reset the lifting height of the jack 27 to zero;

[0103] Install two load-bearing lock bars 23 at the same height in the upper and middle sections of the columns 21 and lock them tightly. Place the drilling rig platform 28 on the load-bearing lock bars 23, including the gear fixed plate 41 and the drilling rig turntable 42. Transport the drilling rig 51 to the drilling rig turntable 42 and fix it by auxiliary bolts 44;

[0104] Continue to insert and install the next group of four columns 21, with the column teeth continuous with the bottom columns. Install a pair of limit lock bars 24 in the horizontal transverse and horizontal longitudinal directions respectively and lock them tightly to make the four columns of this group more stable;

[0105] Repeat the insertion and installation of the columns 21 and use the limit lock bars 24 to lock them tightly until the height of the entire vertical displacement system meets the maximum height H required by the drilling design;

[0106] S3: Diagonal bracing system 3

[0107] Behind the tunnel excavation face, on both sides of the ground at a distance of H from the track, vertically implant 1 foundation limit push rod 33 respectively, with the implantation depth not less than 1 m;

[0108] S4: Horizontal rotation system 4

[0109] The horizontal rotation system 4 is fixed on the drilling rig platform 28 and has been installed together with the vertical system 2;

[0110] S5: Vertical rotation system 5

[0111] The vertical rotation system 5 is fixed on the drilling rig turntable 42 and has been installed together with the vertical system 2;

[0112] The operation method of the above curtain grouting rapid positioning drilling system for small-section tunnels is as follows:

[0113] Horizontal movement:

[0114] Loosen the position limiter 14 and slide the four position limiters 14 onto the tracks 12 on both sides; push the entire vertical gantry so that it moves horizontally along the tracks 12 to the set position;

[0115] Slide the four position limiters 14 to the four rollers 13 and press closely against the rollers 13, lock the position limiters 14 to fix the rollers 13, and fix the vertical movement system in the horizontal direction;

[0116] Vertical movement:

[0117] Ascending movement: Zero the jacking height of the jack 27, lift the lifting platform 26 and the jack 27 so that the jack is in contact with the bottom of the drilling rig platform 28. Near the bottom height of the lifting platform 26, install a pair of load-bearing lock bars 23 and lock them;

[0118] Raise the jack 27 and continuously lift the drilling rig platform 28 upward. After reaching the limit height of the jack 27, install a pair of load-bearing lock bars 23 below the drilling rig platform 28 and near its limit height and lock them, and the load-bearing lock bars 23 are located on two opposite sides of the drilling rig platform 28; slowly lower the jacking height of the jack so that the drilling rig platform 28 gently lands on the load-bearing lock bars 23 to avoid hard impacts;

[0119] Zero the jacking height of the jack 27, and continuously raise the height of the drilling rig platform 28 in the order of "jack 27 zeroing - lifting platform raising and locking - jacking up the drilling rig platform and locking". When the height of the drilling rig platform reaches near the required height, use the load-bearing lock bars 23 to move along the column teeth, 5 cm per tooth, and use multiple pairs of spacer bars 25 to be placed between the drilling rig platform 28 and the load-bearing lock bars 23 to precisely adjust the height of the drilling rig platform 28 so that its height error is within 1 cm; the thickness of the spacer bars 25 is selected to be 1 cm.

[0120] Descending movement: Remove the load-bearing lock bars 23 at the bottom of the lifting platform 26, manually adjust the lifting platform 26 to move downward a certain distance so that the distance between the lifting platform 26 and the drilling rig platform 28 is close to the maximum jacking height of the jack 27, install the load-bearing lock bars 23 and lock them, fix the height of the lifting platform 26, increase the jacking height of the jack 27 until it is in contact with and slightly lifts the drilling rig platform 26;

[0121] Remove the load-bearing lock bars 23 and the spacer bars 25 of the drilling rig platform 26, slowly lower the jacking height of the jack 27. When its jacking height is almost zero, install the load-bearing lock bars 23 near the bottom of the drilling rig platform and lock them, and further slowly lower the jacking height of the jack 27 so that the drilling rig platform 28 gently lands on the load-bearing lock bars 23 to avoid hard impacts;

[0122] Remove the load-bearing locking bar 23 at the bottom of the lifting platform 26, manually adjust the lifting platform 26 to move downward for a certain distance, repeat the previous steps, and continuously lower the height of the drilling rig platform 28 in the order of "the lifting platform 26 descends and locks - the jack 27 extends and presses against the drilling rig platform 28 - the drilling rig platform 28 unlocks and slowly descends - the drilling rig platform 28 resumes locking".

[0123] When the height of the drilling rig platform reaches near the required height, use the load-bearing locking bar 23 to move along the column teeth, 5 cm per tooth, and use multiple pairs of spacer bars 25 to be placed between the drilling rig platform 28 and the load-bearing locking bar 23 to precisely adjust the height of the drilling rig platform 28 so that the height error is within 1 cm; the thickness of the spacer bar 25 is selected to be 1 cm.

[0124] Before the load-bearing locking bar of the drilling rig platform 28 is released, its weight must be supported by the jack 27; during the movement of the lifting platform 26 and the drilling rig platform 28, it is necessary to ensure that among a group of four columns 21 at the same height, at least one group of the load-bearing locking bar 23 and the drilling rig platform 28 remains locked, or the two pairs of limit locking bars 24 in the horizontal two directions remain locked to ensure the stability of the entire vertical movement system 2 during the lifting process.

[0125] Diagonal brace support:

[0126] After the horizontal position and vertical position of the drilling rig platform 28 are fixed, adjust the hydraulic telescopic rod 31 to an appropriate length, and respectively sleeve the plane rotating sleeves 34 connected to both ends of the rod on the platform limit push rod 33 and the foundation limit push rod 34; before the drilling rig platform 28 needs to move its position, lift the entire hydraulic telescopic rod 31 vertically upward, and it can be quickly removed and reserved for use.

[0127] Horizontal rotation:

[0128] Rotate the down-the-hole drill 51 and the drill turntable 42 fixedly connected thereto to the horizontal design angle of the drilling hole, and insert the four fixed pin blocks 43 into the first rectangular groove and the second rectangular groove located on the same radius respectively, and the down-the-hole drill 51 and the drill turntable 42 are stuck with the gear fixed disk 41 to complete the fixation of the horizontal drilling angle.

[0129] Vertical rotation:

[0130] Install the drill bit and drill pipe 52 on the down-the-hole drill 51, adjust the down-the-hole drill 51, and adjust the vertical angle of the rotating drill bit and drill pipe to the design angle and lock it, that is, complete the fixation of the vertical drilling angle.

[0131] The above-mentioned method for quickly positioning and drilling of curtain grouting in a small-section tunnel is as follows:

[0132] S1: According to the curtain grouting design scheme, place points on the tunnel excavation surface (the grout stop wall), and use spray paint to clarify each drilling point position;

[0133] S2: Install the entire system and connect the water and electricity;

[0134] S3: Start drilling and positioning, adjust the down-the-hole drill 51, and lock the vertical angle to be consistent with the design parameters;

[0135] S4: Adjust the horizontal rotation system 4 and lock the horizontal angle to be consistent with the design parameters;

[0136] S5: Adjust the horizontal movement system 1 and lock the horizontal position to be consistent with the design parameters;

[0137] S6: Adjust the vertical movement system 2 and lock the vertical position to be consistent with the design parameters;

[0138] S7: Adjust the two hydraulic extension rods 31 to appropriate lengths, and respectively sleevethe planar rotating sleeves 34 rings connected to both ends of the rods on the platform limit push rod 33 and the foundation limit push rod 34 to provide a horizontal support force for the drill rig platform 28, so as to offset most of the recoil force during drilling and reduce the vibration or shaking of the entire system;

[0139] S8: Drill holes and grout;

[0140] S9: Demount the two hydraulic extension rods 31 for standby;

[0141] S10: Conduct the positioning and drilling of the next hole position, and repeat the above steps S3 - S9 until all the design drilling of the curtain grouting plan is completed;

[0142] S11: Demount each component of the system and recycle them for future use.

[0143] The curtain grouting rapid positioning drilling system for a small-section tunnel in the present invention is small in volume. The height of the vertical rod 21 meets the height requirements inside the small-section tunnel. Supported by the drill rig platform 28 that can be raised and lowered in the vertical direction, the down-the-hole drill 51 is carried to achieve rapid positioning drilling.

Claims

1. A quick positioning drilling system for curtain grouting in a small cross-section tunnel, characterized in that Including: A horizontal movement system (1), a vertical movement system (2), and a horizontal rotation system (4), where: The horizontal movement system (1) is used to be arranged on the ground behind the excavation face in the tunnel; The vertical movement system (2) includes: columns (21), a base (22), load-bearing lock bars (23), a lifting platform (26), a jack (27), and a drilling rig platform (28), where: The base (22) is a plate body, horizontally placed on the horizontal movement system (1) and can move left and right along the horizontal movement system (1); The columns (21) are four in number, vertically arranged at the four top corners of the base (22) correspondingly; The load-bearing lock bars (23) are four in number, each spanning between two adjacent columns 21. The heights of two adjacent load-bearing lock bars 23 are different, and the heights of two opposite load-bearing lock bars 23 are equal. The four load-bearing lock bars (23) form a two-layer structure with adjustable positions in the vertical direction; The drilling rig platform (28) is a plate body, horizontally arranged and erected on the upper-layer load-bearing lock bars (23). The drilling rig platform (28) is used to place a down-the-hole drill (51); The lifting platform (26) is a plate body, horizontally arranged and erected on the lower-layer load-bearing lock bars (23); The jack (27) is vertically arranged on the lifting platform (26), with its upper end in contact with the drilling rig platform (28), and is used to push the drilling rig platform (28) upward. When the drilling rig platform (28) changes its position in the vertical direction, it is also used to support the drilling rig platform (28); The load-bearing lock bars (23) are all channel steel bodies, with the open sides of the channel steel bodies facing outward. At both ends of the channel steel bodies, there are clamping sleeves that communicate up and down, and are used to clamp and fix on two adjacent columns (21); Each of the clamping sleeves is a cubic columnar shell, whose back plate is integrally connected to the web of the load-bearing lock bar (23). The outside of the clamping sleeve is provided with an openable structure, which is fixed or opened by a fixing member; The lengths of the two side plates of the clamping sleeve are greater than the width of the column (21). Two insertion holes are opened on each side plate, and the distance between each insertion hole and the back plate is the same as the width of the column (21). On each side plate, the two insertion holes are arranged at intervals up and down for inserting fixing members, and the fixing members are two insertion steel bars; 2. The curtain grouting rapid positioning drilling system for a small-section tunnel according to claim 1, wherein The vertical movement system (2) further includes a cushion strip (25). The cushion strip (25) is a long strip-shaped plate body, with openable slots that communicate up and down at both ends and are open on the outside. The cushion strip (25) is located between the load-bearing lock bar (23) and the drilling rig platform (28), and the slots at both ends are clamped on two adjacent columns (21). The cushion strip (25) is used to finely adjust the height of the drilling rig platform (28).

3. The quick positioning drilling system for curtain grouting of a small cross-section tunnel according to claim 2, wherein, The vertical movement system (2) further includes a limit locking bar (24). The limit locking bar (24) is a channel steel body, and second clamping sleeves that communicate with each other vertically are arranged at both ends thereof. The second clamping sleeves are cube-shaped and communicate with each other vertically, and are used to sleeved on the column (21). The side facing the outside of the column (21) is open; on the side plates of the second clamping sleeve that enclose the opening, and near the outer ends, second insertion holes are opened. The second insertion rods are used to be inserted into the second insertion holes, and the second insertion rods are used to fix each limit locking bar (24) on two adjacent columns (21).

4. The curtain grouting rapid positioning drilling system for a small cross-section tunnel according to claim 3, characterized in that, Two columns (21) at the same end of the base (22) are in a group. In each group, a plurality of square blocks are arranged on the wall surfaces of the opposite sides of the two columns (21). The plurality of square blocks are arranged at intervals along the length direction of each column (21), and are arranged in a zigzag shape on each column (21). Each square block is used to carry the load-bearing locking bar (23) and the limit locking bar (24), and the distance between adjacent square blocks is consistent with the size of the outer contour of the clamping sleeve.

5. The curtain grouting rapid positioning drilling system for a small cross-section tunnel according to claim 4, characterized in that The horizontal rotation system (4) includes: a gear fixed disk (41), a drilling rig turntable (42), a fixed pin block (43) and an auxiliary bolt (44), wherein: The gear fixed disk (41) is a circular steel disk, fixed on the drilling rig platform (28), and first rectangular grooves are opened at intervals around the circumferential circle. The first rectangular grooves are used to insert the fixed pin block (43); The drilling rig turntable (42) is a circular steel disk, coaxially stacked on the gear fixed disk (41), and its diameter is slightly smaller than that of the gear fixed disk (41). It can rotate along a circle. Four second rectangular grooves are opened at equal intervals along its edge and around its circumference. When the second rectangular groove and the first rectangular groove are on the same radius, the fixed pin block (43) is used to be inserted into both of them; The auxiliary bolts (44) are fixed at intervals around the drilling rig turntable (42) and can rotate horizontally together with the drilling rig turntable (42), and are used to fix the down-the-hole drill (51) on the drilling rig turntable (42).

6. The curtain grouting rapid positioning drilling system for a small cross-section tunnel according to claim 5, characterized in that, It further includes a diagonal bracing system (3) arranged in the tunnel for providing lateral support force; The diagonal bracing system (3) includes a hydraulic telescopic rod (31), a platform limit push rod (32), a foundation limit push rod (33), a planar rotating collar (34) and a vertical rotating joint (35), wherein: There are two foundation limit push rods (33), both of which are circular steel columns, located on the ground on the side of the horizontal movement system (1) far away from the excavation face, and are arranged at intervals left and right; the distance between each foundation limit push rod (33) and the vertical movement system (2) is greater than the maximum height of the vertical movement system (2); The platform limit push rod (32) is two steel columns vertically arranged on the side of the drilling rig platform (28) far away from the excavation face, and are arranged at intervals left and right; There are two hydraulic telescopic rods (31), which are circular cross-section hydraulic sleeve rods, corresponding one by one, and are connected between the foundation limit push rod (33) and the platform limit push rod (32); Both ends of each of the hydraulic telescopic rods (31) are connected with vertical rotary joints (35). The vertical rotary joints (35) are U-shaped shells that communicate with each other up and down. Connection holes are provided on both arms, and a steel pin is inserted into the connection holes.

7. The curtain grouting rapid positioning drilling system for a small cross-section tunnel according to claim 6, characterized in that, The horizontal movement system (1) includes: cushion blocks (11), tracks (12), rollers (13) and limiters (14), where: There are two tracks (12), which are arranged in parallel at intervals and are located at the rear side of the excavation surface. Each track (12) is arranged in the left-right direction; The cushion blocks (11) are multiple strip-shaped bodies made of wood or stone. The multiple cushion blocks (11) are parallel to each other and arranged at intervals. Each cushion block (11) is located below the track (12) and fixed to the ground. Each cushion block (11) straddles two tracks (12); There are two pairs of rollers (13). One pair of rollers (13) is connected by a wheel axle and arranged on the track (12); The limiter (14) is sleeved on the track (12) through a hook claw. A limit baffle is arranged on the side close to the roller (13) for blocking the movement of the roller (13) along the track (12).

8. The positioning drilling method of a curtain grouting rapid positioning drilling system for a small-section tunnel according to any one of claims 1-7, characterized in that, The method is as follows: Vertical positioning: Install the drill bit and drill pipe (52) on the down-the-hole drill (51), adjust the down-the-hole drill (51), and adjust the vertical angle of the rotating drill bit and drill pipe to the designed angle and lock it; Adjust the horizontal rotation system (4): Rotate the drill rig turntable (42), and the down-the-hole drill (51) rotates with it. Rotate to the horizontal designed angle of the drill hole. Insert the four fixed pin blocks (43) into the first rectangular groove and the second rectangular groove on the same radius respectively. The down-the-hole drill (51) and the drill rig turntable (42) are stuck with the gear fixed plate (41) to complete the fixation of the horizontal drill hole angle; Adjust the horizontal movement system (1): Loosen the limiter (14), and slide the four limiters (14) to the tracks (12) on both sides; Push the entire vertical gantry to move horizontally along the track (12) to the set position. Slide the four limiters (14) to the four rollers (13) and press closely against the rollers (13). Lock the limiter (14) to lock the horizontal position to be consistent with the design parameters; Adjust the vertical movement system (2): Reset the lifting height of the jack (27). Lift the lifting platform (26) and the jack (27) so that the jack is close to the bottom of the drill rig platform (28). Near the bottom height of the lifting platform (26), install a pair of load-bearing lock bars (23) and lock them; Raise the jack (27), continuously lift the drill rig platform 28 upwards. After reaching the limit height of the jack (27), install a pair of load-bearing lock bars (23) below the drill rig platform (28) and close to its limit height and lock them. The load-bearing lock bars (23) are located on two opposite sides of the drill rig platform (28); Slowly lower the lifting height of the jack so that the drill rig platform (28) gently lands on the load-bearing lock bars (23); And use multiple pairs of cushion bars 25 to pad between the drill rig platform (28) and the load-bearing lock bars (23) to precisely adjust the height of the drill rig platform (28) and lock the vertical position to be consistent with the design parameters; Adjust the lengths of the two hydraulic telescopic rods (31): Slip the rotary collars (34) at both ends of the hydraulic telescopic rods (31) onto the platform limit push rod (32) and the foundation limit push rod (33) respectively to provide horizontal support for the drilling rig platform (28). Drill and grout, and after completion, position and drill the next hole.

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