A trenchless directional drilling construction method

Abstract

The present application relates to a trenchless directional drilling construction method, which includes the following steps: S1 construction preparation, S2 excavation of the entry and exit pits of the pipeline, S3 directional drilling, S4 reaming and pulling the pipe; wherein step S4 is specifically, a connecting device is provided between the reaming drill bit and the head end of the pipe, the connecting device includes a connecting piece and a connecting rod, the connecting piece is connected to the reaming drill bit, the connecting rod is connected to the head end of the pipe, the end of the connecting rod is provided with a connecting ball head, the connecting piece is provided with a ball groove, the connecting piece is connected to the ball head of the connecting rod through the cooperation of the ball groove and the connecting ball head; the connecting rod is provided with a slurry inlet hose, the connecting ball head is provided with a conveying hole connected to the slurry inlet hose, the connecting piece is provided with a through hole for connecting the conveying hole, and the outlet end of the through hole is provided with a nozzle facing the reaming wall; the reaming drill bit is pulled while the pipe is pulled to achieve reaming and pulling the pipe at the same time. The present application has the effect of friction for pulling the pipe over a long distance.

Description

Technical Field

[0001] The present application relates to the field of trenchless technology, and in particular to a trenchless directional drilling construction method. Background Art

[0002] During the construction of municipal underground pipelines, if open excavation is used, it will lead to traffic congestion, serious road damage and other problems, which will have a great impact on residents' daily travel.

[0003] Therefore, the current main method for laying pipelines is trenchless method. Specifically, working pits and receiving pits are excavated on both sides of the ground, and drilling, expanding holes and pipe pulling operations are carried out in the working pits and receiving pits in turn to realize the laying of pipelines, so as to reduce the large amount of road damage caused by open excavation construction, hinder traffic and other environmental impacts.

[0004] With respect to the above-mentioned related technologies, the inventors believe that during the pipe drawing process, the friction between the outer wall of the pipe and the hole wall is relatively large, and pipe drawing is more difficult, especially under the condition of long-distance pipe drawing. Summary of the invention

[0005] In order to reduce the friction of pulling a pipe over a long distance, the present application provides a trenchless directional drilling construction method.

[0006] The present application provides a trenchless directional drilling construction method, which adopts the following technical solution:

[0007] A trenchless directional drilling construction method comprises the following steps:

[0008] S1. Construction preparation;

[0009] S2. Excavation of the entry and exit pits for the pipeline;

[0010] S3, directional drilling;

[0011] S4, reaming and pulling pipe: a connecting device is provided between the reaming drill bit and the head end of the pipeline, the connecting device includes a connecting piece and a connecting rod, the connecting piece is connected to the reaming drill bit, the connecting rod is connected to the head end of the pipeline, a connecting ball head is provided at the end of the connecting rod, a ball groove is provided on the connecting piece, and the connecting piece is connected to the ball head of the connecting rod through the cooperation between the ball groove and the connecting ball head; the connecting rod is provided with a slurry inlet hose, the connecting ball head is provided with a conveying hole connected to the slurry inlet hose, the connecting piece is provided with a through hole for connecting to the conveying hole, and the outlet end of the through hole is provided with a nozzle facing the reaming wall;

[0012] The pipe is pulled while pulling the reaming drill bit, so as to achieve reaming and pipe pulling at the same time.

[0013] By adopting the above technical solution, in the process of the reaming drill bit reaming the hole while pulling the pipe to pass through the reaming hole, the reaming drill bit drives the connecting piece to rotate, thereby driving the nozzle to rotate, and the nozzle can spray mud into the reaming hole, so as to achieve uniform coverage of the inner wall of the reaming hole with mud, and the subsequent pipeline is directly in contact with the mud, the friction is small, the mud can play a protective and lubricating role, and greatly reduce the damage to the pipeline.

[0014] Furthermore, by arranging the ball head to be hinged, when the hole expansion path is a curve, there is a margin for angle change between the connecting piece and the connecting rod.

[0015] Optionally, the connecting device also includes multiple first steel strands and multiple second steel strands, wherein one end of the first steel strand is connected to the reaming drill bit, and the other end of the first steel strand is connected to the connecting piece; one end of the second steel strand is connected to the head end of the pipe, and the other end of the second steel strand is connected to the connecting rod.

[0016] By adopting the above technical solution, the connection point of the steel strand has a high degree of freedom, so that there is a margin for the angle change between the reaming drill bit and the connecting piece to adapt to the curved path.

[0017] Optionally, each of the first steel strands is evenly arranged on a circle with the geometric center line of the reaming drill bit as the center, and the connection position between the first steel strands and the connecting member is located on the maximum contour line of the surface of the connecting member.

[0018] By adopting the above technical solution, the torque of the reaming drill bit is transmitted through the first steel strand, and the connection point of the first steel strand is located on the outer surface of the connecting piece, thereby effectively driving the connecting piece to rotate, that is, improving the torque transmission effect.

[0019] Optionally, the connecting member is provided with a plurality of support rods arranged along the vertical reaming wall, and the ends of the support rods are provided with shaping ball heads for abutting against the reaming wall.

[0020] By adopting the above technical solution, the connecting piece drives the shaping ball head to rotate to smooth and compact the mud, thereby reducing the occurrence of local accumulation of mud or mud falling from the expanded hole wall, thereby improving the lubrication and protection effect of the pipeline.

[0021] Optionally, the shaping ball head is fixed with a sliding tube, and the sliding tube is slidably sleeved on the support rod along the length direction of the support rod, and the support rod is provided with a spring for forcing the sliding tube to slide in the direction toward the expansion hole wall.

[0022] By adopting the above technical solution, the shaping ball head and the support rod are elastically connected by sliding, so that the shaping ball head is more firmly pressed against the expanded hole wall to increase the compaction strength, thereby improving the leveling and compacting effect.

[0023] Optionally, the support rod and the connecting piece are rotatably connected around the axial direction of the support rod, and a linkage structure is provided between the support rod and the connecting rod, and the linkage structure is used to convert the rotational force of the connecting piece along with the reaming drill bit into a torque that drives the support rod to rotate.

[0024] By adopting the above technical solution and setting a linkage structure, the rotational force of the connecting piece along with the reaming drill bit is converted into a torque for driving the support rod to rotate, thereby driving the shaping ball head to rotate, and the reaming drill bit can drive the shaping ball head to rotate (revolution) around the geometric center of the connecting piece and move linearly, that is, the shaping ball head has three dimensions of movement, and the outer peripheral surface of the shaping ball head has a high contact renewal efficiency with the mud of the reaming wall within a limited trajectory, and the shape of the shaping ball head can effectively reduce the blocking of the shaping ball head, and the smoothness of the smoothing is high, which greatly reduces the friction of the pipeline.

[0025] Optionally, the linkage structure includes a first gear and a second gear arranged in one-to-one correspondence with the support rod, wherein the first gear is coaxially connected to the connecting rod, the second gear is coaxially fixed on the support rod, and the first gear is meshed with the second gear.

[0026] By adopting the above technical solution, the connecting piece rotates with the rotation of the reaming drill bit, and the pipe has a certain friction and mass, so the pipe and the connecting rod do not rotate relatively. Therefore, through the engagement of gears, the support rod can be rotated, thereby driving the shaping ball head to rotate.

[0027] Optionally, the first gear and the connecting rod are connected via a self-aligning bearing; a rotation-stop block is fixed to the connecting rod, and a rotation-stop groove is provided on the end face of the first gear; the rotation-stop block is slidingly connected to the rotation-stop groove, and the sliding path is located in the radial plane of the connecting rod.

[0028] By adopting the above technical solution and setting a self-aligning bearing, it can be ensured that when the angle of the connecting piece changes relative to the connecting rod on a curved path, the angle of the first gear changes accordingly, and the first gear can maintain continuous engagement with the second gear; and, through the cooperation of the anti-rotation block and the anti-rotation groove, the first gear and the connecting rod are connected in a anti-rotation manner, thereby ensuring the stability of the gear meshing.

[0029] Optionally, the connecting member is fixed with a first cover body covering the second gear, and the connecting rod is fixed with a second cover body covering the first gear. The openings of the first cover body and the second cover body are arranged opposite to each other and are both located at the meshing position between the first gear and the second gear.

[0030] By adopting the above technical solution, the occurrence of external mud falling into the gear meshing point can be reduced.

[0031] Optionally, in step S4, a carbide sleeve is installed at the head end of the pipe, the outer diameter of the carbide sleeve is larger than the outer diameter of the pipe, and one end of the carbide sleeve has a tapered portion extending toward the connecting rod.

[0032] By adopting the above technical solution, the carbide sleeve can protect the head end of the pipeline to a certain extent and reduce the situation where external mud enters the pipeline. In addition, the carbide sleeve can smooth the mud for a second time to reduce resistance.

[0033] In summary, the present application includes at least one of the following beneficial technical effects:

[0034] When the reaming drill bit is reaming the hole and pulling the pipe through the reaming hole, the reaming drill bit drives the connecting piece to rotate, thereby achieving uniform coverage of the inner wall of the reaming hole with mud. The mud can play a protective and lubricating role, greatly reducing the damage to the pipeline;

[0035] By setting a shaping ball head to smooth and compact the mud, the local accumulation of mud or the mud falling from the expanded hole wall can be reduced, thereby improving the lubrication and protection effect of the pipeline;

[0036] By setting up a linkage structure, the shaping ball head can move in three dimensions. Within a limited trajectory, the outer peripheral surface of the shaping ball head has a high contact and renewal efficiency with the mud on the expanded hole wall, and the smoothing degree is high, which greatly reduces pipeline friction. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a flowchart of the construction method of Example 1.

[0038] Figure 2 It is a schematic diagram of the overall structure of the connecting device of Example 1.

[0039] Figure 3 It is a cross-sectional view of the connection device of Example 1.

[0040] Figure 4 yes Figure 3 A partial enlarged view of point A in the middle.

[0041] Figure 5 It is a cross-sectional view of the first cover body and the second cover body of Example 2.

[0042] Explanation of the reference numerals: 1. Connecting piece; 2. Connecting rod; 3. Support rod; 4. Linkage structure; 10. Reaming drill bit; 11. First steel strand; 12. Second steel strand; 13. Ball groove; 14. Through hole; 15. Nozzle; 20. Pipeline; 201. Carbide sleeve; 202. Cone; 21. Connecting ball head; 22. Slurry inlet hose; 23. Delivery hole; 24. Self-aligning bearing; 25. Anti-rotation block; 30. Connecting device; 31. Sliding tube; 311. Sliding groove; 312. Sliding block; 32. Plastic ball head; 33. Spring; 41. First gear; 411. Anti-rotation groove; 42. Second gear; 51. First cover body; 52. Second cover body. DETAILED DESCRIPTION

[0043] The following is combined with Figure 1-5 This application is described in further detail.

[0044] Example 1 of the present application discloses a trenchless directional drilling construction method.

[0045] Reference Figure 1 , the trenchless directional drilling construction method includes the following steps:

[0046] S1. Construction preparation, including the following steps:

[0047] S1.1. Survey the construction site, combine the underground pipeline network and obstacle information provided by the construction unit, clarify the underground pipelines, wires and cables and communication equipment in the construction area, do a good job of site leveling, and ensure the positioning and anchoring of the directional drilling rig.

[0048] S1.2. Based on pipeline design and layout and on-site survey conditions.

[0049] S1.3. Before drilling, calculate the depth that the drill rod should reach based on the bottom elevation of the pipeline 20 required by the design drawings and the corresponding original ground elevation, and determine the directional drilling trajectory.

[0050] S1.4. According to the pipeline laying design route, measure and determine the positions of the underground end and the underground end, as well as the drilling rig installation center line and position line.

[0051] S2, excavating the entry pit and exit pit of the pipeline 20; specifically, carrying out earthwork construction according to the measured fixed points, excavating the entry pit and exit pit of the pipeline 20, and setting a working pit for temporarily storing mud at the entry end and exit end of the directional drilling respectively.

[0052] S3. Directional drilling. Specifically, anchor the drill rig with anchor rods before installation. When the soil layer is hard and dry, straight anchor rods are used, and for relatively soft soil layers, spiral anchor rods are used. After the drilling rig is installed, test drilling is carried out to check whether the axis and slope of the machine base have changed after operation, and the installation quality and stability of the drilling rig are repeatedly and carefully checked.

[0053] Then the drilling rig is started, and the drill bit enters the designed route from the place where the pipeline 20 emerges from the foundation pit, and drills out from the place where the pipeline 20 enters the foundation pit, completing the excavation of the guide hole of the pre-expanded hole.

[0054] S4, expanding the hole and pulling the pipe, specifically, after completing the excavation of the guide hole, remove the drill bit and connect the expanding drill bit 10 to the drill rod, then install the connecting device 30 and the pipe 20 in sequence on the end of the expanding drill bit 10 away from the drill rod, and then rotate the drilling rig to pull back the expanding drill bit 10, that is, expand the hole while pulling the pipe 20 into the expanded hole.

[0055] Specifically, Figure 2 As shown, the connecting device 30 includes a first steel strand 11, a second steel strand 12, a connecting member 1 and a connecting rod 2, wherein the connecting member 1 is a spherical structure, and the first steel strand 11 and the second steel strand 12 are provided in plurality, each first steel strand 11 is evenly arranged in a circle with the geometric center line of the reaming drill bit 10 as the center, one end of the first steel strand 11 is connected to the reaming drill bit 10, and the other end of the first steel strand 11 is connected to the maximum contour line on the surface of the connecting member 1.

[0056] like Figure 3 As shown, an annular carbide sleeve 201 is sleeved and welded on the head end of the pipe 20, the outer diameter of the carbide sleeve 201 is larger than the outer diameter of the pipe 20, one end of the carbide sleeve 201 extends toward the connecting rod 2 with an annular cone 202, the inner diameter of the cone 202 is smaller than the inner diameter of the pipe 20, so as to reduce the probability of external mud entering the pipe 20; one end of the second steel strand 12 is connected to the outer surface of the cone 202, and the other end of the second steel strand 12 is connected to the outer surface of the connecting rod 2.

[0057] like Figure 3 As shown, a connecting ball head 21 is fixed at the end of the connecting rod 2, and a ball groove 13 is provided on the outer surface of the connecting piece 1. The connecting rod 2 realizes ball head connection with the connecting piece 1 through the cooperation of the connecting ball head 21 and the ball groove 13, and the content volume of the ball groove 13 is larger than the volume of the connecting ball head 21, that is, there is still spare space in the ball groove 13. The connecting rod 2 is equipped with a slurry inlet hose 22, which passes through the pipeline 20, and the inlet end of the slurry inlet hose 22 is located on the ground. The connecting ball head 21 is penetrated by a conveying hole 23, that is, the external mud can enter the ball groove 13 through the slurry inlet hose 22 and the conveying hole 23 in turn. The connecting piece 1 is also provided with a plurality of through holes 14, the inlet end of the through hole 14 is located on the inner wall of the ball groove 13, and the outlet ends of the through holes 14 are evenly distributed on the outer peripheral surface of the connecting piece 1, and the outlet end of the through hole 14 is equipped with a nozzle 15, and the nozzle 15 faces the expansion hole wall.

[0058] The mud in the ball groove 13 will be sprayed onto the reaming wall through the nozzle 15, and then the nozzle 15 and the connecting piece 1 will rotate along with the rotation of the reaming drill bit 10. Therefore, by the rotary spraying method, the mud can cover the reaming wall more evenly, and the mud can play a protective and lubricating role. The subsequent pipe 20 is in direct contact with the mud, and the friction is small, so that the damage to the pipe 20 is greatly reduced.

[0059] Furthermore, Figure 4 As shown, the connecting member 1 is provided with a plurality of support rods 3 uniformly arranged along the circumference of its own geometric center line, the support rods 3 are arranged vertically to the expansion hole wall, the support rods 3 are rotatably connected to the connecting member 1 around its own axis, and the end of the support rod 3 is sleeved with a sliding tube 31, the sliding tube 31 can slide axially along the support rod 3, and the outer wall of the support rod 3 is protruding with a slider 312, the inner wall of the sliding tube 31 is provided with a sliding groove 311 along its own axial direction, the slider 312 is slidably connected with the sliding groove 311, and a spring 33 is provided in the sliding tube 31, the two ends of the spring 33 are respectively abutted against the end of the support rod 3 and the inner end surface of the sliding tube 31, and the spring 33 forces the sliding tube 31 to slide in the direction toward the expansion hole wall.

[0060] A shaping ball head 32 is fixed to the end of the sliding tube 31 away from the support rod 3, and the elastic force of the spring 33 forces the shaping ball head 32 to press against the expansion hole wall to smooth and compact the mud on the expansion hole wall, thereby reducing the occurrence of local accumulation of mud or mud falling from the expansion hole wall, thereby improving the lubrication and protection effect of the pipeline 20.

[0061] like Figure 4 As shown, a linkage structure 4 is provided between the support rod 3 and the connecting rod 2, and the linkage structure 4 is used for converting the rotational force of the connecting member 1 along with the reaming drill bit 10 into a torque for driving the support rod 3 to rotate; specifically, the linkage structure 4 includes a first gear 41 and a second gear 42 which is arranged one-to-one corresponding to the support rod 3, wherein a rotating hole (not marked in the figure) is opened in the middle of the first gear 41, and the connecting rod 2 passes through the rotating hole, and a self-aligning bearing 24 is arranged between the connecting rod 2 and the inner wall of the rotating hole, so that the first gear 41 and the connecting rod 2 have a certain degree of freedom of angle change, so as to reduce the occurrence of gear disengagement due to excessive angle change of the connecting member 1, and at the same time, the thickness of the gear can be increased to ensure that the gears can be kept engaged even with large movements.

[0062] A rotation-stop block 25 is fixed to the outer wall of the connecting rod 2, and a rotation-stop groove 411 is provided on the end face of the first gear 41. The rotation-stop block 25 is slidingly connected to the rotation-stop groove 411, and the sliding path is located in the radial plane of the connecting rod 2, that is, the first gear 41 and the connecting rod 2 are circumferentially stationary.

[0063] The second gear 42 is coaxially fixed on the support rod 3 , and the first gear 41 is meshed with the second gear 42 .

[0064] The reaming drill bit 10 has two-dimensional movements of linear displacement and rotation, so it can drive the shaping ball head 32 to move linearly and rotate (revolution) around the geometric center line of the expansion drill bit, and through the linkage structure 4, through gear meshing, to drive the shaping ball head 32 to rotate, that is, the shaping ball head 32 has three-dimensional movements. Within a limited trajectory, the outer peripheral surface of the shaping ball head 32 has a high contact renewal efficiency with the mud on the reaming wall, and the shape of the shaping ball head 32 can effectively reduce the jamming of the shaping ball head 32, and the smoothness is high, which greatly reduces the friction of the pipeline 20.

[0065] Example 2, based on Example 1, the following settings are made: Figure 5 As shown, the connecting member 1 is fixed with a first cover body 51 covering the second gear 42, and the opening of the first cover body 51 is opened at the meshing position of the second gear 42 and the first gear 41; the connecting rod 2 is fixed with a second cover body 52 covering the first gear 41, and the opening of the second cover body 52 is opened at the meshing position between the first gear 41 and the second gear 42; and the opening part of the first cover body 51 extends into the opening of the second cover body 52, and there is a certain radial distance between the two.

[0066] In this way, the first cover body 51 and the second cover body 52 play a shielding role, which can reduce the occurrence of external mud falling into the meshing portion between the first gear 41 and the second gear 42.

[0067] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A trenchless directional drilling construction method, characterized in that: The following steps are involved: S1. Construction preparation; S2, excavating the entry pit and exit pit of the pipeline (20); S3, directional drilling; S4, hole expansion and pipe pulling: a connecting device (30) is provided between the hole expansion drill bit (10) and the head end of the pipeline (20), the connecting device (30) comprises a connecting piece (1) and a connecting rod (2), the connecting piece (1) is connected to the hole expansion drill bit (10), the connecting rod (2) is connected to the head end of the pipeline (20), a connecting ball head (21) is provided at the end of the connecting rod (2), the connecting piece (1) is provided with a ball groove (13), the connecting piece (1) is connected to the ball head of the connecting rod (2) through the cooperation of the ball groove (13) and the connecting ball head (21); the connecting rod (2) is provided with a slurry inlet hose (22), the connecting ball head (21) is provided with a conveying hole (23) connected to the slurry inlet hose (22), the connecting piece (1) is provided with a through hole (14) for connecting to the conveying hole (23), and the outlet end of the through hole (14) is provided with a nozzle (15) facing the wall of the hole expansion; Pulling the reaming drill bit (10) while pulling the pipe (20) to achieve reaming and pulling the pipe at the same time; The connecting member (1) is provided with a plurality of support rods (3) arranged along the vertical reaming wall, and the ends of the support rods (3) are provided with shaping ball heads (32) for abutting against the reaming wall; the support rods (3) and the connecting member (1) are rotatably connected around the axial direction of the support rods (3), and a linkage structure (4) is provided between the support rods (3) and the connecting rod (2), and the linkage structure (4) is used to convert the rotational force of the connecting member (1) along with the reaming drill bit (10) into a torque for driving the support rods (3) to rotate; the linkage structure (4) comprises a first gear (41) and a second gear (42) arranged one-to-one corresponding to the support rods (3), wherein the first gear (41) is coaxially connected to the connecting rod (2), and the second gear (42) is coaxially fixed to the support rod (3), and the first gear (41) is meshed with the second gear (42).

2. The trenchless directional drilling construction method according to claim 1, characterized in that: The connecting device (30) further comprises a plurality of first steel strands (11) and a plurality of second steel strands (12), wherein one end of the first steel strand (11) is connected to the reaming drill bit (10), and the other end of the first steel strand (11) is connected to the connecting piece (1); one end of the second steel strand (12) is connected to the head end of the pipe (20), and the other end of the second steel strand (12) is connected to the connecting rod (2).

3. The trenchless directional drilling construction method according to claim 2, characterized in that: The first steel strands (11) are evenly arranged on a circle with the geometric center line of the reaming drill bit (10) as the center circumference, and the connection position between the first steel strands (11) and the connecting member (1) is located on the maximum contour line of the surface of the connecting member (1).

4. The trenchless directional drilling construction method according to claim 1, characterized in that: The shaping ball head (32) is fixed with a slide tube (31), the slide tube (31) is slidably sleeved on the support rod (3) along the length direction of the support rod (3), and the support rod (3) is provided with a spring (33) for forcing the slide tube (31) to slide in a direction toward the expansion hole wall.

5. The trenchless directional drilling construction method according to claim 1, characterized in that: The first gear (41) and the connecting rod (2) are connected via a self-aligning bearing (24); a rotation-stop block (25) is fixed to the connecting rod (2), and a rotation-stop groove (411) is provided on the end face of the first gear (41); the rotation-stop block (25) is slidably connected to the rotation-stop groove (411), and its sliding path is located within the radial plane of the connecting rod (2).

6. The trenchless directional drilling construction method according to claim 1, characterized in that: The connecting member (1) is fixed with a first cover body (51) covering the second gear (42), and the connecting rod (2) is fixed with a second cover body (52) covering the first gear (41), and the openings of the first cover body (51) and the second cover body (52) are arranged opposite to each other and are both located at the meshing position between the first gear (41) and the second gear (42).

7. The trenchless directional drilling construction method according to claim 1, characterized in that: In step S4, a hard alloy sleeve (201) is installed at the head end of the pipe (20), the outer diameter of the hard alloy sleeve (201) is larger than the outer diameter of the pipe (20), and one end of the hard alloy sleeve (201) extends toward the connecting rod (2) with a conical portion (202).

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