CN114575743A - Non-excavation directional drilling construction method - Google Patents

Abstract

The present application relates to a construction method for trenchless directional drilling, which includes the following steps: S1 construction preparation, S2 excavation of the foundation pit and excavation of the pipeline, S3 directional drilling, S4 reaming and pipe drawing; wherein the steps S4 is specifically, a connecting device is provided between the reaming bit and the head end of the pipeline, the connecting device includes a connecting piece and a connecting rod, the connecting piece is connected with the reaming bit, the connecting rod is connected with the head end of the pipeline, and the end of the connecting rod is provided with There is a connecting ball head, the connecting piece is provided with a ball groove, and the connecting piece is connected with 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 feeding hose, and the connecting ball head is provided with The connecting piece is provided with a through hole for communicating with the conveying hole, and the outlet end of the through hole is provided with a nozzle facing the reaming wall; while pulling the reaming bit, the pipeline is pulled to realize the expansion at the same time. Holes and Pull Tubes. The present application has the effect of the friction of pulling the tube over long distances.

Description

A kind of trenchless directional drilling construction method

technical field

The present application relates to the field of trenchless technology, in particular to a trenchless directional drilling construction method.

Background technique

During the construction of the municipal underground pipe network, if the open-cut method is adopted, it will cause problems such as traffic congestion and serious road damage, which will have a great impact on the daily travel of residents.

Therefore, at present, the pipeline is mainly laid in a trenchless method. Specifically, the working pit and the receiving pit are excavated on both sides of the ground, and the drilling, reaming and pipe drawing operations are performed in sequence at the working pit and the receiving pit to realize The layout of pipelines can reduce a large number of road damage caused by open-cut construction and hinder traffic and other environmental impacts.

In view of the above-mentioned related technologies, the inventor believes that during the process of drawing the pipe, the friction between the outer wall of the pipe and the wall of the hole is relatively large, and it is difficult to draw the pipe especially under the condition of long-distance drawing of the pipe.

SUMMARY OF THE INVENTION

In order to reduce the frictional force of long-distance pipe pulling, the present application provides a trenchless directional drilling construction method.

A kind of trenchless directional drilling construction method provided by the application adopts the following technical scheme:

A trenchless directional drilling construction method, comprising the following steps:

S1, construction preparation;

S2. The excavation of the buried foundation pit and the excavated foundation pit of the pipeline;

S3, directional drilling;

S4. Reaming and pipe drawing: 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 with the reaming drill bit, and the connecting rod is connected with the head end of the pipeline. The connecting rod The end of the connecting rod is provided with a connecting ball head, the connecting piece is provided with a ball groove, and the connecting piece is connected with 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 feeding hose, and the connection The ball head is provided with a conveying hole communicating with the slurry feeding hose, the connecting piece is provided with a through hole for communicating with the conveying hole, and the outlet end of the through hole is provided with a nozzle facing the reaming wall;

The pipe is pulled while the reaming bit is pulled to realize reaming and pipe drawing at the same time.

By adopting the above technical solution, in the process that the reaming bit pulls the pipe through the reaming hole while reaming the hole, the reaming bit drives the connecting piece to rotate, thus driving the nozzle to rotate, and the nozzle can spray the mud into the reaming hole, thereby The mud is uniformly covered on the inner wall of the reaming hole, and the subsequent pipeline is directly in contact with the mud, the friction is small, and the mud can protect and lubricate, which greatly reduces the damage to the pipeline.

In addition, by setting the ball joint, when the reaming path is a curve, there is a margin for the angle change between the connecting piece and the connecting rod.

Optionally, the connection device further includes a plurality of first steel strands and a plurality of second steel strands, wherein one end of the first steel strand is connected to the reaming bit, and the other end of the first steel strand is connected to the reaming bit. connected with the connecting piece; one end of the second steel strand is connected with the head end of the pipeline, and the other end of the second steel strand is connected with the connecting rod.

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

Optionally, each of the first steel strands is evenly arranged around the geometric center line of the reaming bit, and the connection position of the first steel strand and the connecting piece is located on the surface of the connecting piece. on the largest contour line.

By adopting the above technical solution, the torque of the reaming 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, so that the connecting piece can be effectively driven to rotate, that is, the torque transmission effect is improved .

Optionally, the connector is provided with a plurality of support rods arranged along the vertical reaming wall, and the ends of the supporting rods are provided with shaping balls for abutting against the reaming wall.

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

Optionally, the shaping ball head is fixed with a sliding tube, the sliding tube is slidably sleeved on the supporting rod along the length direction of the supporting rod, and the supporting rod is provided with a sliding tube for forcing the sliding tube to face the reaming wall. Sliding spring.

By adopting the above technical solution, the elastic sliding connection between the shaping ball head and the support rod is made, so that the shaping ball head is more firmly pressed against the reaming hole wall, so as to improve the compaction strength and thus the smoothing and compaction effect.

Optionally, the support rod and the connecting piece are rotatably connected around the axis of the support rod, and a linkage structure is arranged between the support rod and the connecting rod, and the linkage structure is used to connect the connecting piece with the expansion of the connecting piece. The rotational force of the hole drill is converted into a torque that drives the rotation of the support rod.

By adopting the above technical solution, by setting up a linkage structure, the rotating force of the connecting piece with the reaming bit is converted into a torque that drives the rotation of the support rod, thereby driving the shaping ball to rotate, and the reaming bit can drive the shaping ball around the connection. The geometric center of the piece rotates (revolution) and moves in a straight line, that is, the shaping ball head has three-dimensional motion. The shaping ball head is within a limited trajectory, and the contact renewal efficiency between the outer peripheral surface and the mud of the reaming wall is high, and the structure shaping ball head The shape of the ball can effectively reduce the jamming of the shaping ball, and the smoothness of the smoothing is high, which greatly reduces the friction of the pipeline.

Optionally, the linkage structure includes a first gear and a second gear provided one-to-one corresponding to 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 The first gear meshes with the second gear.

By adopting the above technical solution, the connecting piece rotates with the rotation of the reaming bit, and the pipeline has a certain friction force and quality, so the pipeline and the connecting rod do not rotate relatively, so the rotation of the supporting rod can be realized through the gear meshing, thereby driving the Plastic ball head rotation.

Optionally, the first gear and the connecting rod are connected by self-aligning bearings; the connecting rod is fixed with an anti-rotation block, and the end surface of the first gear is provided with a anti-rotation groove; the anti-rotation block is connected to the anti-rotation block. The rotary groove is connected by sliding, and the sliding path is located in the radial surface of the connecting rod.

By adopting the above-mentioned technical solution, by arranging the self-aligning bearing, it can be ensured that when the angle of the connecting piece changes relative to the connecting rod in the curved path, the angle of the first gear changes accordingly, and the first gear can keep continuously meshing with the second gear; and , through the cooperation of the anti-rotation block and the anti-rotation groove, the first gear is connected with the connecting rod to prevent rotation, thereby ensuring the stability of the gear meshing.

Optionally, a first cover body covering the second gear is fixed on the connecting piece, a second cover body covering the first gear is fixed on the connecting rod, the first cover body and the The openings of the second cover body are arranged opposite to each other and are located at the meshing position between the first gear and the second gear.

By adopting the above technical solution, the occurrence of external mud falling into the gear mesh can be reduced.

Optionally, in step S4, a cemented carbide sleeve is installed at the head end of the pipe, the outer diameter of the cemented carbide sleeve is larger than the outer diameter of the pipe, and one end of the cemented carbide sleeve extends toward the connecting rod with a section of tapered portion. .

By adopting the above technical solution, the cemented carbide sleeve can protect the head end of the pipeline to a certain extent, and reduce the situation of external mud entering the pipeline, and the cemented carbide sleeve can smooth the mud twice to reduce the resistance.

To sum up, the present application includes at least one of the following beneficial technical effects:

When the reaming bit pulls the pipe through the reaming hole while reaming the hole, the reaming bit drives the connecting piece to rotate, so as to achieve uniform coverage of the mud on the inner wall of the reaming hole. The mud can protect and lubricate, which greatly reduces the damage to the pipeline;

By setting the shaping ball head to smooth and compact the mud, thereby reducing the local accumulation of mud or the occurrence of mud falling from the reaming wall, thereby improving the lubrication and protection effect of the pipeline;

By setting the linkage structure, the shaping ball head has three dimensions of movement. The shaping ball head is in a limited trajectory, and the contact renewal efficiency between the outer peripheral surface and the mud of the reaming hole wall is high, and the smoothness of the trowel is high, which greatly reduces the Pipe friction.

Description of drawings

FIG. 1 is a flow chart of the construction method of the first embodiment.

FIG. 2 is a schematic diagram of the overall structure of the connection device of Embodiment 1. FIG.

3 is a cross-sectional view of the connecting device of the first embodiment.

FIG. 4 is a partial enlarged view of A in FIG. 3 .

5 is a cross-sectional view of a first cover body and a second cover body of Example 2. FIG.

Description of reference numerals: 1, connecting piece; 2, connecting rod; 3, supporting rod; 4, linkage structure; 10, reaming bit; 11, first steel strand; 12, second steel strand; 13, ball Groove; 14. Through hole; 15. Nozzle; 20. Pipe; 201. Carbide sleeve; 202. Cone; 21. Connection ball; ;25, anti-rotation block; 30, connecting device; 31, slide pipe; 311, chute; 312, slider; 32, shaping ball head; 33, spring; 41, first gear; 411, anti-rotation groove; 42 , the second gear; 51, the first cover body; 52, the second cover body.

Detailed ways

The present application will be further described in detail below in conjunction with accompanying drawings 1-5.

Embodiment 1 of the present application discloses a trenchless directional drilling construction method.

1, the trenchless directional drilling construction method includes the following steps:

S1. Construction preparation, including the following steps:

S1.1. Investigate the construction site, find out the underground pipelines, wires and cables and communication equipment in the construction area based on the underground pipeline network and obstacle information in the construction area provided by the construction unit, do a good job of site leveling, and ensure that the directional drilling rig is positioned and anchored .

S1.2. According to the design and layout of the pipeline and the on-site survey.

S1.3. Before drilling, first calculate the depth that the drill pipe should reach according to the inner bottom elevation of the pipeline 20 and the corresponding original ground elevation required by the design drawings, and determine the directional drilling trajectory.

S1.4. According to the pipeline laying design line, measure and determine the position of the end of the earth, the end of the excavation, and the installation center line and position line of the drilling rig.

S2. Excavate the buried foundation pit and the unearthed foundation pit of the pipeline 20; specifically, perform earthwork construction according to the measurement and fixed points, excavate the buried foundation pit of the pipeline 20 and the unearthed foundation pit of the pipeline 20, and drill the directional drilling into the soil end and the unearthed end respectively. Set up a work pit for staging mud.

S3. Directional drilling, specifically, before the drilling rig is installed, use the anchor rod to anchor, when the soil layer is hard and dry, use the straight anchor rod, and use the spiral anchor rod for the relatively soft soil layer; after the drilling rig is installed, test the drilling operation. And check whether the axis and slope of the machine base change after operation, and repeatedly and carefully check the installation quality and stability of the drilling rig.

Then the drilling rig is turned on, the drill bit enters the designed route from the excavated foundation pit of the pipeline 20, and drills out from the excavation of the pipeline 20 into the soil foundation pit to complete the excavation of the pre-reaming guide hole.

S4, reaming and drawing the pipe, specifically, after the excavation of the guide hole is completed, remove the drill bit and connect the reaming drill bit 10 to the drill rod, and then install and connect the reaming drill bit 10 on the end away from the drill rod in sequence The device 30 and the pipeline 20 are then rotated back by the drilling rig to drag the reaming bit 10, that is, the pipeline 20 is pulled into the reaming hole while reaming.

Specifically, as shown in FIG. 2 , the connecting device 30 includes a first steel strand 11 , a second steel strand 12 , a connecting piece 1 and a connecting rod 2 , wherein the connecting piece 1 is a spherical-like structure, and the first steel strand 11 Each of the first steel strands 11 is evenly arranged around the geometric center line of the reaming drill bit 10 , and one end of the first steel strand 11 is connected to the reaming drill bit 10 . , the other end of the first steel strand 11 is connected to the largest contour line of the surface of the connector 1 .

As shown in FIG. 3 , a ring-shaped cemented carbide sleeve 201 is sleeved and welded at the head end of the pipe 20 . The outer diameter of the cemented carbide sleeve 201 is larger than the outer diameter of the pipe 20 , and one end of the cemented carbide sleeve 201 faces the connecting rod. There is an annular cone 202 extending in the 2 direction, and the inner diameter of the cone 202 is smaller than the inner diameter of the pipe 20 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 second The other end of the steel strand 12 is connected to the outer surface of the connecting rod 2 .

As shown in FIG. 3 , the end of the connecting rod 2 is fixed with a connecting ball head 21 , the outer surface of the connecting piece 1 is provided with a ball groove 13 , and the connecting rod 2 is connected to the connecting piece 1 through the cooperation of the connecting ball head 21 and the ball groove 13 . In addition, the inner volume of the ball groove 13 is larger than the volume of the connecting ball head 21, that is, the ball groove 13 still has extra space, and the connecting rod 2 is equipped with a slurry feeding hose 22, which passes through the pipeline. 20. The inlet end of the slurry feeding hose 22 is located on the ground, and the connecting ball head 21 is provided with a conveying hole 23, that is, the external mud can enter the ball groove 13 through the slurry feeding hose 22 and the conveying hole 23 in turn. There are also 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, the outlet end of each through hole 14 is evenly distributed on the outer peripheral surface of the connector 1, and the outlet end of the through hole 14 is installed with a nozzle 15 , the nozzle 15 faces the reaming wall.

The mud in the ball groove 13 will be sprayed onto the reaming wall through the nozzle 15, and then both the nozzle 15 and the connecting piece 1 will rotate with the rotation of the reaming bit 10. Therefore, the mud can be more uniformly covered on the reaming wall by the rotary spray method. , the mud can play a protective and lubricating role, and the subsequent pipeline 20 is in direct contact with the mud, and the frictional force is small, so as to greatly reduce the damage to the pipeline 20 .

Further, as shown in Figure 4, the connector 1 is provided with a plurality of support rods 3 evenly arranged along the circumference of its geometric center line, the support rods 3 are arranged vertically to the reaming wall, and the support rod 3 and the connector 1 are arranged around their own axes. Rotationally connected, the end of the support rod 3 is sleeved with a slide pipe 31, the slide pipe 31 can slide axially along the support rod 3, and the outer wall of the support rod 3 is protruded with a sliding block 312, and the inner wall of the slide pipe 31 is along the There is a chute 311 axially opened on its own, the slider 312 is slidably connected to the chute 311, and a spring 33 is arranged in the slide tube 31, and both ends of the spring 33 abut against the end of the support rod 3 and the inner part of the slide tube 31 respectively. On the end face, the spring 33 forces the sliding tube 31 to slide in the direction toward the counterbore wall.

The end of the slide pipe 31 away from the support rod 3 is fixed with a shaping ball head 32, and the elastic force of the spring 33 forces the shaping ball head 32 to press against the reaming hole wall, so as to smooth and compact the mud on the reaming hole wall. Thus, the occurrence of local accumulation of mud or the occurrence of mud falling from the wall of the reaming hole is reduced, thereby improving the effect of lubricating and protecting the pipeline 20 .

As shown in FIG. 4, a linkage structure 4 is provided between the support rod 3 and the connecting rod 2, and the linkage structure 4 is used to convert the rotational force of the connecting piece 1 with the reaming bit 10 into a torque that drives the support rod 3 to rotate; Therefore, the linkage structure 4 includes a first gear 41 and a second gear 42 corresponding to the support rod 3 one-to-one, wherein a rotating hole (not shown in the figure) is opened in the middle of the first gear 41, and the connecting rod 2 passes through the rotating hole , and the 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 angular change, so as to reduce the excessive angle change of the connecting piece 1. Disengagement occurs and the thickness of the gears can be increased to ensure that large play still keeps the gears engaged.

An anti-rotation block 25 is fixed on the outer wall of the connecting rod 2 , an anti-rotation groove 411 is formed on the end surface of the first gear 41 , and the anti-rotation block 25 is slidably connected with the anti-rotation groove 411 , and the sliding path is located in the radial direction of the connecting rod 2 . In-plane, that is, between the first gear 41 and the connecting rod 2 in the circumferential direction is stationary.

The second gear 42 is coaxially fixed on the support rod 3 , and the first gear 41 meshes with the second gear 42 .

The reaming drill bit 10 has two dimensions of motion, linear displacement and rotation, so it can drive the shaping ball head 32 to move linearly and rotate (revolution) around the geometric centerline of the expansion drill bit, and through the linkage structure 4, through the gear meshing, to drive the shaping The ball head 32 rotates, that is, the shaping ball head 32 has three-dimensional motion, the shaping ball head 32 is in a limited trajectory, and the contact renewal efficiency of the outer peripheral surface and the mud of the reaming wall is high, and the shape of the structural shaping ball head 32, The jamming of the shaping ball head 32 can be effectively reduced, and the smoothness of the smoothing is high, which greatly reduces the friction of the pipeline 20 .

Example 2, on the basis of Example 1, the following settings are made. As shown in FIG. 5 , the connector 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 place between the second gear 42 and the first gear 41 ; the connecting rod 2 is fixed with a second cover 52 covering the first gear 41 , and the opening of the second cover 52 is opened on the first gear 41 and the second gear 42 In addition, the opening of the first cover body 51 extends into the opening of the second cover body 52, and there is a certain radial distance between them.

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 place between the first gear 41 and the second gear 42 .

The above are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore: all equivalent changes made according to the structure, shape and principle of the present application should be covered within the scope of the present application. Inside.

Claims (10)

1. a trenchless directional drilling construction method is characterized in that: comprise the following steps: S1, construction preparation; S2. The excavation of the buried foundation pit and the excavated foundation pit of the pipeline (20); S3, directional drilling; S4, reaming and pipe drawing: a connecting device (30) is arranged between the reaming bit (10) and the head end of the pipeline (20), and the connecting device (30) includes a connecting piece (1) and a connecting rod (2), The connecting piece (1) is connected with the reaming bit (10), the connecting rod (2) is connected with the head end of the pipeline (20), the end of the connecting rod (2) is provided with a connecting ball head (21), and the connecting piece (1) A ball groove (13) is provided, and the connecting piece (1) is connected with the ball head of the connecting rod (2) through the cooperation of the ball groove (13) and the connecting ball head (21); A slurry hose (22), the connecting ball head (21) is provided with a conveying hole (23) that communicates with the slurry feeding hose (22), and the connecting piece (1) is provided with a through hole (23) for communicating with the conveying hole (23). 14), the outlet end of the through hole (14) is provided with a nozzle (15) facing the reaming wall; The pipe (20) is pulled while the reaming bit (10) is pulled, so as to realize reaming and pipe drawing at the same time. 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 with the reaming bit (10), and the other end of the first steel strand (11) is connected with the connecting piece (1); the second steel strand One end of the wire (12) is connected with the head end of the pipe (20), and the other end of the second steel strand (12) is connected with the connecting rod (2). 3. The trenchless directional drilling construction method according to claim 2, characterized in that: each of the first steel strands (11) takes the geometric centerline of the reaming bit (10) as the center and the circumference is uniform Arrangement, the connection position of the first steel strand (11) and the connecting piece (1) is located on the largest contour line of the surface of the connecting piece (1). 4 . The trenchless directional drilling construction method according to claim 1 , wherein the connecting piece ( 1 ) is provided with a plurality of support rods ( 3 ) arranged along the vertical reaming wall. The end of the rod (3) is provided with a shaping ball head (32) for abutting against the wall of the reaming hole. 5 . The trenchless directional drilling construction method according to claim 4 , wherein a sliding pipe ( 31 ) is fixed to the shaping ball head ( 32 ), and the sliding pipe ( 31 ) runs along the support rod. 6 . (3) The longitudinal sliding sleeve is sleeved on the support rod (3), and the support rod (3) is provided with a spring (33) for forcing the sliding pipe (31) to slide in the direction toward the reaming hole wall. 6. The trenchless directional drilling construction method according to claim 4, characterized in that: the support rod (3) and the connecting piece (1) are rotatably connected around the axis of the support rod (3), so that the A linkage structure (4) is provided between the support rod (3) and the connecting rod (2), and the linkage structure (4) is used to convert the rotating force of the connecting piece (1) with the reaming drill bit (10). Converted into the torque that drives the support rod (3) to rotate. 7 . The trenchless directional drilling construction method according to claim 6 , wherein the linkage structure ( 4 ) comprises a first gear ( 41 ) and a first gear ( 41 ) provided one-to-one corresponding to the support rod ( 3 ). 8 . Two gears (42), wherein the first gear (41) is coaxially connected to the connecting rod (2), the second gear (42) is coaxially fixed on the support rod (3), and the first gear (41) is coaxially connected to the connecting rod (2). The second gear (42) is meshed. 8 . The trenchless directional drilling construction method according to claim 7 , wherein: the first gear ( 41 ) and the connecting rod ( 2 ) are connected by a self-aligning bearing ( 24 ); the connecting rod ( 2) An anti-rotation block (25) is fixed, and an anti-rotation groove (411) is formed on the end face of the first gear (41); the anti-rotation block (25) is slidably connected to the anti-rotation groove (411) , and the sliding path is located in the radial plane of the connecting rod (2). 9 . The trenchless directional drilling construction method according to claim 7 , wherein the connecting piece ( 1 ) is fixed with a first cover body ( 51 ) covering the second gear ( 42 ). 10 . 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 opposite to each other are arranged and both are located at the meshing position between the first gear (41) and the second gear (42). 10. The trenchless directional drilling construction method according to claim 1, characterized in that: in step S4, a cemented carbide sleeve (201) is installed at the head end of the pipeline (20), and the cemented carbide sleeve (201 ) is larger than the outer diameter of the pipe (20), and one end of the cemented carbide sleeve (201) extends toward the connecting rod (2) with a tapered portion (202).

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