CN116677320B

CN116677320B - Pipeline laying method for crossing grade highway

Info

Publication number: CN116677320B
Application number: CN202310810144.2A
Authority: CN
Inventors: 贺云根; 李必正; 张利杰; 薛建纲; 谢剑利; 陈岗; 江北
Original assignee: Zhejiang Electric Power Construction Co ltd
Current assignee: Zhejiang Electric Power Construction Co ltd
Priority date: 2023-07-04
Filing date: 2023-07-04
Publication date: 2023-12-12
Anticipated expiration: 2043-07-04
Also published as: CN116677320A

Abstract

The application discloses a pipeline laying method for crossing grade highways, which comprises a horizontal directional drill, a reamer, a connector, a pipeline, a sleeve, a subsurface positioning device, a locking mechanism and a remote controller; the horizontal directional drill comprises a drill body, a drill rod and a drill bit. The pipeline laying method for crossing the grade highway comprises the following specific steps: firstly, drilling a guide hole in the ground; installing a reamer, connecting one end of a pipeline with the reamer through a connector, sleeving one end of the pipeline, which is close to the connector, with a sleeve, and locking the sleeve on the pipeline by a locking mechanism; thirdly, the reamer moves along the guide hole and reams the guide hole; fourthly, releasing the sleeve by the locking mechanism; fifthly, continuously dragging the drill rod back by the drill body; and sixthly, the locking mechanism is detached from the pipeline, and the pipeline and the connector are disconnected. In the present application, the connection between the casing and the reamer may be broken in the pilot hole as the casing passes under the grade road.

Description

Pipeline laying method for crossing grade highway

Technical Field

The application relates to the technical field of pipeline laying, in particular to a pipeline laying method for crossing grade highways.

Background

The horizontal directional drill is utilized to lay the pipeline, so that the pipeline does not need to be dug, the influence on the ground is small, and the like. According to regulations, when laying a pipe passing through a grade road, the outside of the pipe section below the grade road needs to be provided with a sleeve to protect the pipe on the inside.

The existing horizontal directional drill comprises a drill body, a drill rod and a drill bit which can be detachably connected with the end part of the drill rod. When a pipeline crossing a grade road is paved by using a horizontal directional drill, firstly, a guide hole is drilled underground by using a drill bit, secondly, after the drill bit is drilled from underground, the drill bit is detached from a drill rod, then a reamer is arranged on the drill rod, then the pipeline and a sleeve are connected through a connector at the rear of the reamer, the sleeve is sleeved on the pipeline, thirdly, the drill rod is towed back, the guide hole is reamed by using the reamer, the guide hole is enlarged to form a towing back hole, meanwhile, the pipeline and the sleeve are paved in the towing back hole along with the forward movement of the reamer, after the reamer is returned to the ground, the pipeline and the sleeve successfully pass through the towing back hole, finally, the pipeline and the reamer are disconnected on the ground, and the connection between the sleeve and the reamer is disconnected.

For the convenience of explanation problem, will return and drag the hole and divide into anterior segment, back end to the interlude between anterior segment and back end to the ground with the interlude is kept away from to the anterior segment, and the interlude is located the grade highway below, and the interlude is kept away from to the back end and runs through to the ground with the interlude, and the pipeline needs the cover to establish the sleeve pipe in the interlude position according to prescribing. When the horizontal directional drill is used for paving a pipeline crossing a grade road, when the drill rod is pulled back from the rear section to the front section, the sleeve needs to be penetrated out of the ground of the front section together with the reamer to disconnect the connection between the sleeve and the reamer, namely, the length of the sleeve at least needs to cover the front section and the middle section, so that the length of the sleeve is longer, the weight of the sleeve is larger, and further, higher requirements are also put forth on the power of the horizontal directional drill, and the engineering cost is greatly increased.

Disclosure of Invention

The application provides a pipeline laying method for traversing a grade road, which aims to solve the defects of larger length of a sleeve and larger power required by horizontal directional drilling of the existing pipeline laying method for traversing the grade road, and can disconnect the sleeve and a reamer in a back-dragging hole when the sleeve passes under the grade road, thereby reducing the length of the sleeve, the power of the horizontal directional drilling and the engineering cost.

In order to achieve the above purpose, the application adopts the following technical scheme:

a pipeline laying method for crossing grade highways comprises a horizontal directional drill, a reamer, a connector arranged on the reamer, a pipeline to be laid, a sleeve sleeved on the pipeline, an underground positioning device arranged on the sleeve, a locking mechanism arranged on the pipeline and capable of locking the sleeve on the pipeline, and a remote controller for controlling the locking mechanism to release the sleeve; the horizontal directional drill includes a drill body, a drill pipe, and a drill bit mountable at an end of the drill pipe. The pipeline laying method for crossing the grade highway comprises the following specific steps: firstly, installing a drill bit at the end part of a drill rod, drilling a guide hole underground by using the drill bit, and passing through the lower part of a grade road; secondly, after the drill bit drills to the ground, the drill bit is detached from the drill rod, an reamer is arranged, one end of a pipeline is connected with the reamer through a connector, a sleeve is sleeved at one end of the pipeline, which is close to the connector, and a locking mechanism locks the sleeve on the pipeline; thirdly, the drill rod is pulled back by the drill body, the reamer moves along the guide hole and reams the guide hole, a pulling back hole is formed after the guide hole is reamed, the pipeline and the sleeve advance along with the reamer and enter the pulling back hole, and a constructor on the ground positions the sleeve underground through the underground positioning device; fourthly, when the sleeve reaches the lower part of the grade road, a constructor on the ground controls the locking mechanism through the remote controller, the locking mechanism releases the sleeve, and the sleeve is detained under the grade road to protect a pipeline positioned under the grade road; fifthly, the drill body continues to drag the drill rod back until the end parts of the reamer and the pipeline reach the ground; and sixthly, the locking mechanism is detached from the pipeline, and the pipeline and the connector are disconnected.

In the application, when the drill rod is pulled back, the locking mechanism can release the sleeve in the pulling back hole when the sleeve passes under the grade road, so that the sleeve stays under the grade road, and the pipeline can be paved by continuing pulling back the drill rod; in the application, the sleeve can be separated from the back-dragging hole, and one end of the sleeve does not need to be dragged to the ground to separate as in the prior art, thereby shortening the length of the sleeve, reducing the power of the horizontal directional drill and reducing the construction cost.

Further, when the locking mechanism releases the sleeve, the central line of the grade road corresponds to the middle part of the sleeve up and down, and the end part of the sleeve extends out of the outer edge of the embankment slope toe and the drainage ditch of the grade road to be more than or equal to 2m and less than or equal to 5m.

Through the arrangement, the sleeve installed in the application meets the standard requirements, and meanwhile, the length of the sleeve is properly increased by considering the error of the underground positioning device.

Further, a plurality of lock holes are formed in the sleeve, the locking mechanism comprises a base sleeved on the pipeline, a plurality of balls are rotatably connected to the outer side of the base, a plurality of bolts capable of being inserted into the lock holes are arranged on the outer side of the base, and a first driving cylinder for driving the bolts to move radially along the base is arranged in the base so that the bolts can be inserted into the lock holes or pulled out of the lock holes; when the sleeve is locked on the pipeline, the base is positioned between the sleeve and the pipeline, the ball is abutted against the inner wall of the sleeve, and the bolt is inserted into the lock hole; when the bolt is pulled out of the lock hole, the locking mechanism releases the sleeve, and the sleeve and the pipeline can move relatively.

Through the arrangement, when the bolt is inserted into the lock hole, the back-dragging drill rod can drive the pipeline and the sleeve to move along the back-dragging hole at the same time; when the bolt is pulled out of the lock hole, the locking mechanism releases the sleeve, and when the drill rod is pulled back, the pipeline continues to move and the sleeve stays in the pulling back hole.

Further, a limiting mechanism is arranged on the sleeve, and in the fifth step, the moving pipeline is prevented from driving the sleeve to move by the limiting mechanism.

Further, stop gear includes a plurality of pivoted rotating plates at sheathed tube one end along circumference, when the drilling rod drove the sleeve pipe motion, the rotating plate is located the sleeve pipe and is close to the one end of reamer, the one end fixedly connected with bending plate that the sleeve pipe was kept away from to the rotating plate, the sleeve pipe inner wall is provided with a plurality of tracks, the track extends along sleeve pipe length direction, the track sets up the one end that is close to the rotating plate at the sleeve pipe and sets gradually along sleeve pipe inner circumference, sliding connection has the slider on the track, the slider articulates there is first bracing piece, the inboard fixedly connected with second bracing piece of rotating plate, the one end that the slider was kept away from to first bracing piece articulates the one end that the rotating plate was kept away from at the second bracing piece, the one end that the track was close to the rotating plate is provided with anti-skidding mechanism, be provided with on the base and be used for dodging first bracing piece, the second bracing piece, the track, dodging the dodging groove of slider. The limiting mechanism comprises a rest state and a limiting state; when the limiting mechanism is in a rest state, the bending plate is attached to the pipeline, the rotating plates are spliced to form a conical structure so as to reduce the resistance when the sleeve advances, and the sliding block is arranged on one side of the anti-skid mechanism away from the rotating plates; when the limiting mechanism is in a limiting state, one end of the rotating plate, far away from the sleeve, is scattered and opened, the bending plate is embedded into the hole wall of the back dragging hole, the sliding block is positioned on the anti-sliding mechanism, and the anti-sliding mechanism prevents the sliding block from moving back to the rotating plate so as to prevent the rotating plate from folding. The pipeline is provided with a driving mechanism which can be controlled by the remote controller, and the driving mechanism is used for rotating the rotating plate so as to enable the limiting mechanism to be switched from a rest state to a limiting state; in the third step, when the sleeve moves along the back dragging hole, the limiting mechanism is in a rest state; in the fourth step, when the sleeve reaches the lower part of the grade highway, the drilling machine body stops dragging the drilling rod, constructors on the ground control the driving mechanism through the remote controller, so that the limiting mechanism is switched to a limiting state, and after the locking mechanism releases the sleeve, the drilling machine body continues dragging the drilling rod.

In the application, before the locking mechanism just opens the sleeve, the driving mechanism opens the rotating plate, so that the bending plate is embedded into the wall of the back dragging hole, and the bending plate is similar to a barb, and the sleeve is prevented from being driven to continuously advance by a pipeline which moves subsequently. In the process that the rotating plate rotates outwards, the rotating plate drives the sliding block to move towards the anti-slip mechanism through the second supporting rod and the first supporting rod, when the bending plate is embedded into the hole wall of the drawing hole, the sliding block moves to the anti-slip mechanism, the anti-slip mechanism is matched with the sliding block, and the sliding block is prevented from retreating to fold the rotating plate. In addition, when the pipeline continues to advance, the base slowly leaves the pipeline, and the track, the sliding block, the first supporting rod and the second supporting rod pass through the avoidance groove, so that the base smoothly leaves the sleeve. The base can be detachably connected with the pipeline through bolts, so that the locking mechanism is convenient to detach from the pipeline.

Specifically, after the reamer reams, the diameter of the back dragging hole is larger than the outer diameter of the sleeve, when the rotating plate is outwards opened, the bending plate is embedded into the wall of the back dragging hole, at the moment, the bending plate is similar to a barb, the sleeve is locked in the back dragging hole, and when the pipeline continues to be dragged forwards, the sleeve cannot be driven forwards by the pipeline.

Further, the cross section of the rail is T-shaped, a sliding groove matched with the rail is arranged on the sliding block, and the rail penetrates through the sliding groove and is in sliding connection with the sliding groove; the inner side of the track is provided with a first groove, the anti-skid mechanism is a spring piece which can be pressed into the first groove by a sliding block and restored, one end of the spring piece is fixedly connected to the inner wall of one side of the first groove far away from the rotating plate, the other end of the spring piece is inclined towards the rotating plate and is positioned outside the first groove, and the sliding block is provided with a second groove; when the limiting mechanism is in a limiting state, the first groove corresponds to the second groove in position, and one end of the elastic piece is located in the second groove.

In the application, when the sliding block moves to the first groove along the track, the sliding block extrudes the elastic sheet, the elastic sheet is bent to enter the first groove, when the second groove moves to the elastic sheet, the elastic sheet automatically rebounds, one end of the elastic sheet enters the second groove, and the elastic sheet can prevent the sliding block from backing.

Further, one end of the second supporting rod far away from the rotating plate is rotationally connected with a roller, and in the fourth step, when the limiting mechanism is in a limiting state, the roller can support the pipeline so as to reduce the acting force of the pipeline on the sleeve.

In the fourth step, when the limiting mechanism is in a limiting state and the pipeline continues to advance, the pipeline should touch the roller, on one hand, the bending plate is embedded into the wall of the towing hole after the roller is stressed, and the stability of the sleeve is improved; in addition, the roller can reduce the friction force of the pipeline, so that the pipeline is prevented from driving the sleeve to move.

Further, the driving mechanism comprises a driving sleeve, the driving sleeve is sleeved on the pipeline and is in sliding connection with the pipeline, a second driving cylinder for driving the driving sleeve to move along the pipeline is arranged on the base, and a conical surface is arranged on one side, far away from the base, of the driving sleeve; in the third step, the driving sleeve is positioned between the roller and the base; in the fourth step, the second actuating cylinder drives the drive sleeve and moves dorsad base, and the drive sleeve is close to the gyro wheel, under the conical surface effect, the drive sleeve promotes the gyro wheel and stirs the pivoted plate through the second bracing piece, and pivoted plate and bending plate outwards rotate, and after the bending plate embedded back drags the pore wall in hole, conical surface and gyro wheel are disengaged, and the drive sleeve moves to the opposite side of gyro wheel, and stop gear switches to spacing state.

Further, one side of the driving sleeve, which is far away from the base, is fixedly connected with a limiting sleeve through a connecting rod, and the opposite sides of one end of the rotating plate, which is far away from the sleeve, are provided with trimming edges, and the bent plate is in an equilateral triangle shape; in the third step, the limiting sleeve is sleeved on the bent plate so as to prevent the rotating plate from being opened outside, an avoidance opening is formed between the trimming edges, and the connecting rod passes through the avoidance opening; in the fourth step, when the driving sleeve is close to the roller, the driving sleeve drives the limiting sleeve to move through the connecting rod, and after the driving sleeve leaves the bending plate, the conical surface toggles the rotating plate through the roller.

In the application, when the limiting mechanism is in a rest state, the limiting sleeve is sleeved on the bending plate so as to prevent the sleeve from being blocked due to the fact that the rotating plate is opened outside when the sleeve advances; in addition, through the connection between stop collar and the driving sleeve, make stop collar and driving sleeve synchronous motion, when the driving sleeve motion, the stop collar breaks away from the bending plate earlier, and the driving sleeve drives the pivoted plate again. The triangle design of the bending plate can make the edge of the bending plate more sharp, so that the bending plate is easier to be embedded into the wall of the back dragging hole; in addition, the design of side cut makes the revolute board form when folding and dodges the mouth, supplies the connecting rod to pass, and when the stop collar breaks away from the bending plate, the revolute board can be opened.

Drawings

Fig. 1 is a schematic diagram of an embodiment of a reamer reaming process.

Fig. 2 is an enlarged view at a of fig. 1.

Fig. 3 is an enlarged view at B of fig. 2.

Fig. 4 is a C-C cross-sectional view of fig. 2.

Fig. 5 is a schematic view of the sleeve and spacing mechanism.

Fig. 6 is a side view of fig. 5.

FIG. 7 is a schematic view of the stop collar being sleeved over the bent plate.

Fig. 8 is a schematic view of the limiting mechanism in a rest state.

Fig. 9 is a schematic view of the limiting mechanism in a limiting state.

Fig. 10 is an enlarged view of fig. 9 at D.

Fig. 11 is a schematic view of the casing being retained under a grade road.

Detailed Description

The technical scheme of the application is further specifically described below through examples and with reference to the accompanying drawings.

A method for laying a pipeline crossing a grade road, comprising a horizontal directional drill, a reamer 12, a connector 13 arranged on the reamer 12, a pipeline 14 to be laid, a sleeve 15 for sleeving on the pipeline 14, an underground positioning device (not shown in the figure) arranged on the sleeve 15, a locking mechanism 16 arranged on the pipeline 14 and capable of locking the sleeve 15 on the pipeline 14, and a remote controller (not shown in the figure) for controlling the locking mechanism 16 to release the sleeve 15; the horizontal directional drill includes a drill body (not shown), a drill stem 111, and a drill bit (not shown) mountable at an end of the drill stem 111.

The pipeline laying method for crossing the grade highway comprises the following specific steps:

first, a drill bit is installed at the end of a drill pipe 111, a pilot hole 21 is drilled underground by the drill bit, and the pilot hole 21 passes under a grade road 22;

secondly, after the drill bit drills to the ground, the drill bit is detached from the drill rod 111, the reamer 12 is installed, one end of the pipeline 14 is connected with the reamer 12 through the connector 13, a sleeve 15 is sleeved at one end, close to the connector 13, of the pipeline 14, and the sleeve 15 is locked on the pipeline 14 by the locking mechanism 16;

thirdly, referring to fig. 1, the drill body drags the drill rod 111 back, the reamer 12 moves along the guide hole 21 and reams the guide hole 21, a draging back hole is formed after the guide hole is reamed, the pipeline 14 and the sleeve 15 advance along with the reamer 12 and enter the draging back hole, and a constructor on the ground positions the sleeve 15 underground through an underground positioning device;

fourth, referring to fig. 11, when the sleeve 15 reaches the lower side of the grade road, a constructor on the ground controls the locking mechanism 16 through the remote controller, the locking mechanism 16 releases the sleeve 15, and the sleeve 15 is retained under the grade road to protect the pipe 14 located under the grade road;

fifth, the drill body continues to pull back the drill pipe 111 until the ends of the reamer 12 and the pipe 14 reach the surface;

sixth, the locking mechanism 16 is removed from the pipe 14, and the pipe 14 and the coupling head 13 are disengaged.

In the application, when the drill rod 111 is pulled back, when the sleeve 15 passes under the grade road, the locking mechanism 16 can open the sleeve 15 in the guide hole 21, so that the sleeve 15 stays under the grade road, and the pipeline 14 can be paved by continuing pulling back the drill rod 111; in the application, the sleeve 15 can be separated from the back dragging hole 23, and one end of the sleeve 15 does not need to be dragged to the ground for separation as in the prior art, thereby shortening the length of the sleeve 15, reducing the power of the horizontal directional drill and reducing the construction cost.

The reamer 12, the horizontal directional drill, the connector 13, and the underground positioning device may all be of the prior art, and in particular, the underground positioning device may refer to the patent of application No. 2020214793067, which is not developed herein. In addition, in the sixth step, after the pipe 14 and the connector 13 are disconnected, chemical slurry may be injected between the pipe 14 and the back-dragging hole 23, so as to ensure the stability of the back-dragging hole 23. The locking mechanism is located the pipeline and is close to the one end of reamer, and in the fifth step, when the tip of reamer and pipeline reaches ground, locking mechanism is close to ground this moment, makes things convenient for constructor to pull down locking mechanism from the pipeline.

As one implementation manner, when the locking mechanism 16 releases the sleeve 15, the central line of the grade road corresponds to the middle part of the sleeve 15 up and down, and the end part of the sleeve 15 extends out of the embankment slope toe of the grade road and the outer edge of the drainage ditch to be more than or equal to 2m and less than or equal to 5m.

By the above arrangement, the casing 15 installed in the present application meets the specification requirements, and at the same time, the length of the casing 15 is appropriately increased in consideration of the error of the underground positioning device.

Specifically, in national standards, the outer edge of the embankment slope toe of the grade highway, which extends out of the end part of the sleeve 15, needs to be more than or equal to 2m. In the application, the length of the sleeve 15 is properly increased, the position of the sleeve 15 in the back dragging hole 23 is deviated from front to back, and the national standard requirement can be met.

As an implementation manner, the sleeve 15 is provided with a plurality of lock holes 151, the locking mechanism 16 comprises a base 161 sleeved on the pipeline 14, a plurality of balls 162 are rotatably connected to the outer side of the base 161, a plurality of bolts 163 capable of being inserted into the lock holes 151 are arranged on the outer side of the base 161, and a first driving cylinder 164 for driving the bolts 163 to move along the radial direction of the base 161 is arranged in the base 161 so that the bolts 163 can be inserted into the lock holes 151 or pulled out of the lock holes 151; when the sleeve 15 is locked on the pipeline 14, the base 161 is positioned between the sleeve 15 and the pipeline 14, the balls 162 are abutted against the inner wall of the sleeve 15, and the bolts 163 are inserted into the lock holes 151; when the latch 163 is pulled out of the lock hole 151, the locking mechanism 16 releases the sleeve 15, and the sleeve 15 and the pipe 14 can move relatively.

Through the arrangement, when the latch 163 is inserted into the lock hole 151, the back-dragging drill rod 111 can simultaneously drive the pipeline 14 and the sleeve 15 to move along the back-dragging hole 23; when the latch 163 is pulled out of the latch hole 151, the locking mechanism 16 releases the sleeve 15 and, as the drill rod 111 is pulled back, the pipe 14 continues to move while the sleeve 15 remains in the pull back hole 23.

Specifically, the base 161 is configured to be substantially coaxially disposed between the sleeve 15 and the pipe 14, and the roller 1771 facilitates reducing the resistance to movement of the base 161 as the pipe 14 moves forward after the sleeve 15 is released by the locking mechanism 16 and the pipe 15 is moved forward by the roller 1771.

As an implementation manner, the sleeve 15 is provided with a limiting mechanism 17, and in the fifth step, the pipe 14 which is prevented from moving by the limiting mechanism 17 drives the sleeve 15 to move.

As an implementation manner, the limiting mechanism 17 comprises a plurality of rotating plates 171 hinged to one end of the sleeve 15 along the circumferential direction, when the drill rod 111 drives the sleeve 15 to move, the rotating plates 171 are located at one end of the sleeve 15, which is close to the reamer 12, one end of the rotating plates 171, which is far away from the sleeve 15, is fixedly connected with a bending plate 172, a plurality of tracks 173 are arranged on the inner wall of the sleeve 15, the tracks 173 extend along the length direction of the sleeve 15, the tracks 173 are arranged at one end of the sleeve 15, which is close to the rotating plates 171, and are sequentially arranged along the inner circumference of the sleeve 15, the tracks 173 are slidably connected with sliding blocks 174, the sliding blocks 174 are hinged to first supporting rods 175, second supporting rods 177 are fixedly connected to the inner sides of the rotating plates 171, one ends, which are far away from the sliding blocks 174, of the first supporting rods 175 are hinged to one ends, which are far away from the second supporting rods 177, of the rotating plates 171, the one ends, which are close to the rotating plates 171, of the tracks 173 are provided with anti-skid mechanisms 176, and the base 161 are provided with avoiding grooves 165 for the first supporting rods 175, the second supporting rods 177, the sliding rods 173, the sliding blocks 174, and the sliding blocks 174 are arranged 174.

The limit mechanism 17 includes a rest state and a limit state;

referring to fig. 8, when the limiting mechanism 17 is in a rest state, the bending plate 172 is attached to the pipe 14, and the plurality of rotating plates 171 are spliced to form a conical structure so as to reduce the resistance when the sleeve 15 advances, and the sliding block 174 is arranged on one side of the anti-slip mechanism 176 away from the rotating plates 171;

referring to fig. 9, when the limiting mechanism 17 is in the limiting state, the end of the rotating plate 171 away from the sleeve 15 is opened in a dispersed manner, the bending plate 172 is embedded into the wall of the drawing hole 23, the sliding block 174 is located on the anti-sliding mechanism 176, and the anti-sliding mechanism 176 prevents the sliding block 174 from moving back to the rotating plate 171, so as to prevent the folding of the rotating plate 171.

The pipe 14 is provided with a driving mechanism 18 which can be controlled by a remote controller, and the driving mechanism 18 is used for rotating the rotating plate 171 so as to switch the limiting mechanism 17 from a rest state to a limiting state;

in the third step, when the sleeve 15 moves along the back dragging hole 23, the limiting mechanism 17 is in a rest state;

in the fourth step, when the casing 15 reaches the lower part of the grade highway, the drill body stops pulling the drill rod 111 back, the constructor on the ground controls the driving mechanism 18 through the remote controller, so that the limiting mechanism 17 is switched to the limiting state, and after the locking mechanism 16 releases the casing 15, the drill body continues to pull the drill rod 111 back.

In the present application, immediately before the locking mechanism 16 opens the sleeve 15, the driving mechanism 18 opens the rotating plate 171, so that the bending plate 172 is embedded into the wall of the back-dragging hole 23, and referring to fig. 9, the bending plate 172 is similar to a barb, so that the pipe 14 with subsequent movement is prevented from driving the sleeve 15 to move forward. In the process of outward rotation of the rotating plate 171, the rotating plate 171 drives the sliding block 174 to move towards the anti-slip mechanism 176 through the second supporting rod 177 and the first supporting rod 175, when the bending plate 172 is embedded into the wall of the drawing hole 23, the sliding block 174 moves to the anti-slip mechanism 176, and the anti-slip mechanism 176 is matched with the sliding block 174 to prevent the sliding block 174 from retreating and the rotating plate 171 is folded. In addition, after the rotating plate rotates outwards, the rotating plate is arranged outside the sleeve and outside the advancing path of the base, so that interference between the rotating plate and the base when the base moves forwards is prevented; as the pipe 14 continues to advance, the base 161 slowly leaves the pipe 14, and the rail 173, the slider 174, the first support rod 175, and the second support rod 177 pass through the avoidance groove 165, so that the base 161 smoothly leaves the sleeve 15. The base 161 is removably attachable to the pipe 14 by bolts to facilitate removal of the locking mechanism 16 from the pipe 14.

As an implementation manner, the cross section of the track 173 is T-shaped, a sliding groove 1741 matched with the track 173 is arranged on the sliding block 174, and the track 173 passes through the sliding groove 1741 and is in sliding connection with the sliding groove 1741; the inner side of the track 173 is provided with a first groove 1731, the anti-slip mechanism 176 is a spring plate which can be pressed into the first groove 1731 by the sliding block 174 and restored, one end of the spring plate is fixedly connected to the inner wall of the first groove 1731 at one side far away from the rotating plate 171, the other end of the spring plate is inclined towards the rotating plate 171 and is positioned outside the first groove 1731, and the sliding block 174 is provided with a second groove 1742;

when the limiting mechanism 17 is in a limiting state, the first groove 1731 and the second groove 1742 are corresponding in position, and one end of the elastic piece is located in the second groove 1742.

In the present application, when the slider 174 moves to the first groove 1731 along the track 173, the slider 174 presses the spring plate, the spring plate is bent to enter the first groove 1731, when the second groove 1742 moves to the spring plate, the spring plate automatically rebounds, one end of the spring plate enters the second groove 1742, and the spring plate can prevent the slider 174 from backing, see fig. 10.

As an implementation manner, the end of the second supporting rod 177 away from the rotating plate 171 is rotatably connected with a roller 1771, and in the fourth step, when the limiting mechanism 17 is in the limiting state, the roller 1771 can support the pipe 14, so as to reduce the acting force of the pipe 14 on the sleeve 15.

In the fourth step, when the limiting mechanism 17 is in a limiting state and the pipeline 14 continues to advance, the bending plate 172 is embedded into the wall of the towing hole 23 after the roller 1771 is stressed on one hand, so that the stability of the sleeve 15 is improved; in addition, the roller 1771 reduces friction of the tube 14, thereby preventing the tube 14 from moving the sleeve 15.

As one implementation, the driving mechanism 18 comprises a driving sleeve 181, the driving sleeve 181 is sleeved on the pipeline 14 and is in sliding connection with the pipeline 14, a second driving cylinder 182 for driving the driving sleeve 181 to move along the pipeline 14 is arranged on the base 161, and a conical surface 1811 is arranged on one side, away from the base 161, of the driving sleeve 181;

in the third step, the driving sleeve 181 is positioned between the roller 1771 and the base 161;

in the fourth step, the second driving cylinder 182 drives the driving sleeve 181 to move back to the base 161, the driving sleeve 181 is close to the roller 1771, under the action of the conical surface 1811, the driving sleeve 181 pushes the roller 1771 and toggles the rotating plate 171 through the second supporting rod 177, the rotating plate 171 and the bending plate 172 rotate outwards, the conical surface 1811 and the roller 1771 are disengaged after the bending plate 172 is embedded into the wall of the dragging hole 23, the driving sleeve 181 moves to the other side of the roller 1771, and the limiting mechanism 17 is switched to a limiting state.

As an implementation manner, a limit sleeve 184 is fixedly connected to one side of the driving sleeve 181 away from the base 161 through a connecting rod 183, and trimming edges 1711 are arranged on two opposite sides of one end of the rotating plate 171 away from the sleeve 15, and the bending plate 172 is in an equilateral triangle shape;

in the third step, the limiting sleeve 184 is sleeved on the bending plate 172 to prevent the rotation plate 171 from being opened, and an avoiding opening 1712 is formed between the trimming edges 1711, and the connecting rod 183 passes through the avoiding opening 1712;

in the fourth step, when the driving sleeve 181 approaches the roller 1771, the driving sleeve 181 drives the stop collar 184 to move through the connecting rod 183, and after the driving sleeve 181 leaves the bending plate 172, see fig. 8, the conical surface 1811 drives the rotating plate 171 through the roller 1771, see fig. 9.

In the application, when the limiting mechanism 17 is in a rest state, the limiting sleeve 184 is sleeved on the bending plate 172, so as to prevent the sleeve 15 from being blocked due to the fact that the rotating plate 171 is opened outside when the sleeve 15 advances; in addition, through the connection between the stop collar 184 and the driving collar 181, the stop collar 184 and the driving collar 181 are moved synchronously, and when the driving collar 181 is moved, referring to fig. 8, the stop collar 184 is separated from the bending plate 172, and the driving collar 181 drives the rotating plate 171. The triangular design of the bending plate 172 can make the edge of the bending plate 172 more sharp, so that the bending plate 172 is easier to be embedded into the wall of the back-dragging hole 23; in addition, the edge 1711 is designed such that when the rotating plate 171 is folded, the avoiding opening 1712 is formed for the connecting rod 183 to pass through, and when the limit sleeve 184 is separated from the bending plate 172, the rotating plate 171 can be opened.

It will be understood that modifications and variations will be apparent to those skilled in the art from the foregoing description, and it is intended that all such modifications and variations be included within the scope of the following claims.

Claims

1. The pipeline laying method for crossing the grade highway is characterized by comprising a horizontal directional drill, an reamer, a connector arranged on the reamer, a pipeline to be laid, a sleeve sleeved on the pipeline, an underground positioning device arranged on the sleeve, a locking mechanism which is arranged on the pipeline and can lock the sleeve on the pipeline, and a remote controller for controlling the locking mechanism to release the sleeve;

the horizontal directional drill comprises a drill body, a drill rod and a drill bit which can be installed at the end part of the drill rod;

firstly, installing a drill bit at the end part of a drill rod, drilling a guide hole underground by using the drill bit, and passing through the lower part of a grade road;

secondly, after the drill bit drills to the ground, the drill bit is detached from the drill rod, an reamer is arranged, one end of a pipeline is connected with the reamer through a connector, a sleeve is sleeved at one end of the pipeline, which is close to the connector, and a locking mechanism locks the sleeve on the pipeline;

thirdly, the drill rod is pulled back by the drill body, the reamer moves along the guide hole and reams the guide hole, a pulling back hole is formed after the guide hole is reamed, the pipeline and the sleeve advance along with the reamer and enter the pulling back hole, and a constructor on the ground positions the sleeve underground through the underground positioning device;

fourthly, when the sleeve reaches the lower part of the grade road, a constructor on the ground controls the locking mechanism through the remote controller, the locking mechanism releases the sleeve, and the sleeve is detained under the grade road to protect a pipeline positioned under the grade road;

fifthly, the drill body continues to drag the drill rod back until the end parts of the reamer and the pipeline reach the ground;

sixthly, the locking mechanism is detached from the pipeline, and the pipeline and the connector are disconnected;

the sleeve is provided with a plurality of lock holes, the locking mechanism comprises a base sleeved on the pipeline, the outer side of the base is rotationally connected with a plurality of balls, the outer side of the base is provided with a plurality of bolts which can be inserted into the lock holes, and a first driving cylinder for driving the bolts to move along the radial direction of the base is arranged in the base so that the bolts can be inserted into the lock holes or pulled out of the lock holes;

when the sleeve is locked on the pipeline, the base is positioned between the sleeve and the pipeline, the ball is abutted against the inner wall of the sleeve, and the bolt is inserted into the lock hole;

when the bolt is pulled out of the lock hole, the locking mechanism releases the sleeve, and the sleeve and the pipeline can move relatively;

a limiting mechanism is arranged on the sleeve, and in the fifth step, the limiting mechanism prevents the moving pipeline from driving the sleeve to move;

the limiting mechanism comprises a plurality of rotating plates hinged to one end of the sleeve in the circumferential direction, when the drill rod drives the sleeve to move, the rotating plates are located at one end of the sleeve, close to the reamer, of the rotating plates, one end of the rotating plates, close to the sleeve, is fixedly connected with a bending plate, a plurality of tracks are arranged on the inner wall of the sleeve, extend along the length direction of the sleeve, are arranged at one end of the sleeve, close to the rotating plates, and are sequentially arranged along the inner circumference of the sleeve, the tracks are connected with sliding blocks in a sliding manner, the sliding blocks are hinged to first supporting rods, second supporting rods are fixedly connected to the inner sides of the rotating plates, one end of the first supporting rods, close to the sliding blocks, of the second supporting rods, and avoidance grooves for avoiding the first supporting rods, the second supporting rods, the tracks and the sliding blocks are arranged on the base;

the limiting mechanism comprises a rest state and a limiting state;

when the limiting mechanism is in a rest state, the bending plate is attached to the pipeline, the rotating plates are spliced to form a conical structure so as to reduce the resistance when the sleeve advances, and the sliding block is arranged on one side of the anti-skid mechanism away from the rotating plates;

when the limiting mechanism is in a limiting state, one end of the rotating plate, which is far away from the sleeve, is scattered and opened, the bending plate is embedded into the hole wall of the back dragging hole, the sliding block is positioned on the anti-sliding mechanism, and the anti-sliding mechanism prevents the sliding block from moving back to the rotating plate so as to prevent the folding of the rotating plate;

the pipeline is provided with a driving mechanism which can be controlled by the remote controller, and the driving mechanism is used for rotating the rotating plate so as to enable the limiting mechanism to be switched from a rest state to a limiting state;

in the third step, when the sleeve moves along the back dragging hole, the limiting mechanism is in a rest state;

in the fourth step, when the sleeve reaches the lower part of the grade highway, the drilling machine body stops dragging the drilling rod, constructors on the ground control the driving mechanism through the remote controller, so that the limiting mechanism is switched to a limiting state, and after the locking mechanism releases the sleeve, the drilling machine body continues dragging the drilling rod.

2. The method for paving a pipeline crossing a grade road according to claim 1, wherein when the locking mechanism releases the sleeve, the central line of the grade road corresponds to the middle part of the sleeve up and down, and the end part of the sleeve extends out of the outer edge of the embankment slope toe and the drainage ditch of the grade road to be more than or equal to 2m and less than or equal to 5m.

3. The method for paving a pipeline crossing a grade highway according to claim 1, wherein the cross section of the track is T-shaped, a sliding groove matched with the track is arranged on the sliding block, and the track passes through the sliding groove and is in sliding connection with the sliding groove;

the inner side of the track is provided with a first groove, the anti-skid mechanism is a spring piece which can be pressed into the first groove by a sliding block and restored, one end of the spring piece is fixedly connected to the inner wall of one side of the first groove far away from the rotating plate, the other end of the spring piece is inclined towards the rotating plate and is positioned outside the first groove, and the sliding block is provided with a second groove;

when the limiting mechanism is in a limiting state, the first groove corresponds to the second groove in position, and one end of the elastic piece is located in the second groove.

4. The method for laying a pipeline crossing a grade road according to claim 1, wherein the end of the second support rod, which is far away from the rotating plate, is rotatably connected with a roller, and in the fourth step, the roller supports the pipeline when the limiting mechanism is in a limiting state, so as to reduce the acting force of the pipeline on the sleeve.

5. The method for paving a pipeline crossing a grade road according to claim 4, wherein the driving mechanism comprises a driving sleeve, the driving sleeve is sleeved on the pipeline and is in sliding connection with the pipeline, a second driving cylinder for driving the driving sleeve to move along the pipeline is arranged on the base, and a conical surface is arranged on one side, far away from the base, of the driving sleeve;

in the third step, the driving sleeve is positioned between the roller and the base;

in the fourth step, the second actuating cylinder drives the drive sleeve and moves dorsad base, and the drive sleeve is close to the gyro wheel, under the conical surface effect, the drive sleeve promotes the gyro wheel and stirs the pivoted plate through the second bracing piece, and pivoted plate and bending plate outwards rotate, and after the bending plate embedded back drags the pore wall in hole, conical surface and gyro wheel are disengaged, and the drive sleeve moves to the opposite side of gyro wheel, and stop gear switches to spacing state.

6. The method for paving a pipeline crossing a grade road according to claim 5, wherein one side of the driving sleeve, which is far away from the base, is fixedly connected with a limit sleeve through a connecting rod, and the opposite sides of one end of the rotating plate, which is far away from the sleeve, are provided with cut edges, and the bent plate is in an equilateral triangle shape;

in the third step, the limiting sleeve is sleeved on the bent plate so as to prevent the rotating plate from being opened outside, an avoidance opening is formed between the trimming edges, and the connecting rod passes through the avoidance opening;

in the fourth step, when the driving sleeve is close to the roller, the driving sleeve drives the limiting sleeve to move through the connecting rod, and after the driving sleeve leaves the bending plate, the conical surface toggles the rotating plate through the roller.