JP3520141B2 - How to lay pipes underground in an arc - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of laying a pipe in the shape of an arc in the ground. When there are rivers, harbors, etc., and it is not possible to excavate from the ground, when laying large diameter pipes such as gas pipes, water and sewer pipes, etc. To serve.

[0002]

2. Description of the Related Art A conventional method of laying a pipe in the shape of an arc in the ground will be described with reference to FIG. FIG. 7 shows a case in which a pipe is laid in an arc shape in a stratum below a river and laid.
One side of the river 1 is the starting side of the pipe and the other side is the arrival side of the pipe, and the excavator 2 is installed on the starting side. In this example, the excavation pipe 3 has a pilot pipe 4 at the front part and a watchover pipe 5 at the rear part. The pilot pipe 4 is provided with a bit 6 having a rotating mechanism as a drilling device at the front end, and a hole core measuring device 7. First, as shown in FIG. 7A, the excavation pipe 3 is laid in an arc shape along the planned trajectory on the arrival side across the river 1 by the operation of the excavator 2. Here, only the bit 6 is rotated by the hydraulic motor 8. After reaching the arrival side, the pilot pipe 4 is sequentially removed for each unit of connection by screws, and the whole is removed. Next, on the arrival side, instead of the pilot pipe, a drill pipe 9 is joined as the expansion pipe to the front end of the watchover pipe 5 and is pulled toward the starting side. The state is shown in FIG. Figure 7
In (b), the drill pipe 9 is provided with a bit 10 at a connecting portion with the washover pipe 5 for expansion and expansion as an expansion and removal pipe. The excavator 2 applies torque and thrust to the watchover pipe 5 and the bit 10, and the drill pipe 9 is pulled toward the starting side. Figure 7
In (c), the laying pipe (main pipe) 11 is connected to the drill pipe 9 following the movement of the drill pipe 9, and is subsequently drawn to the starting side. In this example, the swivel 1 is provided at the connecting portion between the drill pipe 9 and the laying pipe 11.
2. Reamer 13 and cutter 14 for cutting. Torque and thrust are applied to the drill pipe 9 and the cutter 14 by the excavator 2 so that the drill pipe 9 and the cutter 14 are retracted and moved.
The laying pipe 11 does not rotate.

Next, as another conventional technique, FIG. 8 shows a case in which a laying pipe is drawn in and laid by an expanding and cutting pipe which also serves as an excavation pipe. In FIG. 8 (a),
The drill pipe 15 is used as the expansion pipe, and the rotary bit 16 is provided as the excavating device at the front end in order to serve also as the excavation pipe. The drill pipe 15 is sent by the excavator 2 installed on the ground, and is excavated and laid in an arc shape.
Next, as shown in FIG. 8B, the bit 16 of the drill pipe 15 is removed and a hole expanding cutter 17 which is an expanding and cutting device.
And the reamer 18 and the swivel 19 are connected in series, and a pipe (main pipe) 2 is installed at the rear end of the swivel 19.
By connecting 0 and pulling while rotating the drill pipe 15 by the excavator 2 on the ground, the thrust and the rotational force are transmitted to the hole expanding cutter 17, the hole is expanded and the laying pipe is drawn by the swivel 19 without rotating. .

[0004]

In the method of laying a pipe in the shape of an arc in the ground shown in FIGS. 7 and 8 described above, the rigidity of the pipeline such as the laying pipe is higher than the proof strength of the soft ground. In the case of winning, the balance between the weight of the pipeline in the soil and the floating force of the pipe becomes unbalanced, and as a result, as shown in FIG. 6, the laying pipe 11 (or the drill pipe 9) is laid (in FIG. 6). deviating from w),
It may happen that the excavation pipe (expanding pipe in the case of FIG. 8) does not follow the track previously dug or the intended laying track within a certain range. Not only that, but it may cause damage to pipelines, jigs and the like. Even when foreign matter is present in the laying track portion of the pipeline, these problems similarly occur. Further, during the laying of the pipeline, the frictional resistance of the peripheral surface increases and the excavator being installed lacks the capacity, which may hinder the rapid construction promotion of the pipeline laying. This becomes a particular problem as the diameter of the pipe increases. Further, during the laying of the pipeline, the work of pulling in the pipe may be interrupted due to some circumstances, or the pulling in of the pipe may be delayed due to changes in conditions such as soil quality around the pipe being laid. In such a situation, it becomes impossible or difficult for the excavator to restart / execute the drawing of the pipe. This is a problem in order to proceed with smooth construction.

In view of the above-mentioned problems of the prior art, the object of the present invention is to maintain the pipe laying track with good construction accuracy and to carry out the construction quickly and smoothly even if the conditions such as soil quality change. An object of the present invention is to provide a method of laying an underground pipe in an arc shape, which can cope with an interruption of internal work.

[0006]

The method of laying a pipe in the shape of an arc in the ground according to the present invention is a method of laying a pipe in the shape of an arc by non-excavation in the ground. A pipe pulling device for pulling the pipe being laid on the ground backward is installed, and the excavating machine and the excavating device provided at the front end of the excavating pipe lay the excavating pipe in an arc shape along the planned trajectory, and then The expansion pipe is connected to the excavation pipe on the arrival side, and the expansion pipe is pulled in by the excavator while expanding by the expansion device provided at the connection portion between the excavation pipe and the expansion pipe. When subsequently connecting the laying pipe to the expanding pipe and pulling the laying pipe by the excavator, the expanding pipe or the laying pipe is clamped by the pipe pulling device, and back tension is applied to the pipe. Expansion pipe It is constructed by adjusting the laying trajectory of the laying pipe. Here, the pipe pulling device is
It is a device that pulls the pipe being installed by applying thrust to the direction opposite to the installation direction, that is, backward. The pipe pulling device may have a function of a pipe pushing device to be described later, and may be configured to push the pipe being laid in the same direction as the laying direction, that is, by applying a forward thrust force to the pipe. The pipe drawing device is of a cylinder mechanism type, a wire and winch type, or the like. The back tension by the pipe pulling device detects that the pipe deviates from the laying track by a posture measuring device that measures the inclination of the pipe, and acts so as to cope with the amount and degree of the deviation. Further, it is possible to adopt a working method in which a certain amount of back tension is constantly applied. Here, the laying track of the pipe is a track of the excavation pipe or the excavating pipe that has been dug ahead, or can be set as a track within a certain allowable range from these tracks. Further, the expansion pipe is a pipe that is connected and drawn in after the excavation pipe, and is provided with an expansion device provided at a connecting portion with the excavation pipe, and the expansion pipe itself is used by the expansion device. Facilitate the progress in. On the other hand, the expansion / reduction pipe is a pipe that connects and draws in the installation pipe subsequently, and the expansion / reduction device may be provided at the connection part with the installation pipe. Facilitates the progression of pipes underground. The excavating device uses a bit, a cutter, and the like, and the rotation thereof depends on the excavator, but a system in which the bit or the like has a rotation driving mechanism separately from the mechanism for rotating the pipe may be used. A drill pipe can be used as the expansion pipe.

The method of laying a pipe in the shape of an arc according to the present invention is the method of laying a pipe in the shape of an arc in the ground by non-excavation, in which the excavator is installed on the ground on the starting side and the pipe on the ground on the reaching side. A pipe pulling device for pulling backward, and the excavator and the excavating device provided at the front end of the expanding pipe also serving as the excavating pipe are laid in an arc along the planned track, In the case where the laying pipe is connected to the expansion pipe on the arrival side, and the laying pipe is pulled by the excavator while expanding by the expansion device provided in the connecting portion between the expansion pipe and the laying pipe, It is configured by clamping the laid pipe by a pipe drawing device and applying back tension to adjust the laying track of the laid pipe.

[0008]

The method of laying a pipe in the shape of an arc in the ground according to the present invention is a method of laying a pipe in the shape of an arc in the ground by non-excavation, in which the excavator is laid on the ground on the starting side and the pipe on the ground on the arriving side. A pipe pulling device which pulls the pipe backward, and the excavator and an excavating device provided at the front end of the excavating pipe lay the excavating pipe in an arc shape along a planned trajectory, and then at the reaching side Connect the expansion pipe to the pipe for
While expanding by a expanding device provided in a connecting portion between the excavating pipe and the expanding pipe, the expanding pipe is pulled in by the excavating machine, and subsequently, a laying pipe is connected to the expanding pipe, When pulling the laid pipe by an excavator, or in a method of laying the pipe in an arc shape by non-opening in the ground, pull the excavator on the ground on the starting side and pull the pipe being laid on the ground on the reaching side backward. A drilling machine and an excavator equipped at the front end of the excavating pipe that also serves as the excavating pipe are used to lay the excavating pipe in an arc along the planned trajectory, and then to expand the expanse at the reaching side. When the laying pipe is connected to the shaving pipe, and the laying pipe is pulled in by the excavator while the digging machine pulls the laying pipe while expanding by the shaving device provided in the connecting portion between the shaving pipe and the laying pipe, the connection during retraction is performed.
It was拡削if progression of the pipe and laying pipe has been stopped or stagnant, to the拡削pipe and the laying pipe, by the excavator
Alternately pulling operation by pulling operation and the pipe pulling device
Then, the drawing machine restarts the drawing of these pipes. The force required to pull in the pipe increases if the pulling operation of the pipe is interrupted while the pipeline is being laid, or if conditions such as the soil quality around the pipe being laid are changing, such as landslides that slow the pulling of the pipe. However, it may be difficult to make initial movements when retraction is resumed and to continue retraction. In such a case, the load of pulling force required for pulling in the pipe is reduced by giving the pipe being laid two motions in the front and rear directions. From this point of view, the pipe pulling device causes the pipe to perform a backward motion. When the pipe pulling device has a reciprocating drive mechanism, when the pipe is moved in the forward direction, the pipe pulling device is used as a pipe pushing device to exert a pushing force in the forward direction of the pipe to assist the pipe excavator. May be.

The method for laying a pipe in the shape of an arc according to the present invention is the same as the method described above, in which a posture measuring device for measuring the inclination of the pipe is provided at the front end of the laying pipe to measure the posture of the laying pipe at the front end. It is constructed by controlling the track of the laid pipe while monitoring. The posture measuring device measures the inclination, but in addition to this, it may be configured so as to be able to measure the rotation, bending angle, etc. of the pipe. A known device may be used as this attitude measuring device. In addition, the pipe push
A pusher is installed and the pushing force by the pipe pushing device is the excavator.
It can be performed by additionally adding to the retracting force.
To increase the frictional resistance of the peripheral surface during pipe laying,
Large capacity machine is available to deal with the machine alone
However, the inconvenience of always carrying out construction with the machine
However, the pipe pushing device does not have the disadvantage. Na
The pipe pushing device pushes back and forth to the pipe pulling device.
It is equipped with a force applying mechanism (for example, a cylinder mechanism, etc.)
It can also be used as a pulling device.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a method of laying a pipe in an arc in the ground will be described with reference to FIG. FIG. 1 shows a case in which a pipe is laid in an arc shape in a stratum below a river and laid. As shown in FIG. 1A, the excavation pipe 3 including the pilot pipe 4 and the watchover pipe 5 is
When the excavator 2 is operated, the excavator 2 is laid in an arc shape across a river on the arrival side along a certain track. Only the bit 6 which is the excavation device at the front end of the excavation pipe 3 is rotated by the hydraulic motor 8. Next, on the arrival side, instead of the pilot pipe, a drill pipe 9 is joined as the expansion pipe to the front end of the watchover pipe 5 and is pulled toward the starting side. The state is shown in FIG. (Note that the excavation pipe 3 consists of only the pilot pipe,
It may not have a washover pipe. In this case, the expansion pipe 9 is connected to the pilot pipe. In FIG. 1B, the drill pipe 9 is provided with a bit 10 at a connecting portion with the washover pipe 5 for expanding and cutting as an expanding and cutting pipe. Torque and thrust are applied to the watchover pipe 5 and the bit 10 by the excavator 2, and the drill pipe 9 is pulled toward the starting side. Figure 1
In (c), the laying pipe (main pipe) 11 is connected to the drill pipe 9 following the movement of the drill pipe 9, and is subsequently drawn to the starting side. In this example, the swivel 1 is provided at the connecting portion between the drill pipe 9 and the laying pipe 11.
2. Reamer 13 and cutter 14 for cutting. Torque and thrust are applied to the drill pipe 9 and the cutter 14 by the excavator 2 so that the drill pipe 9 and the cutter 14 are retracted and moved.
The laying pipe 11 does not rotate. As shown in FIG. 1, a pipe pulling device 21a is installed on the arrival side to clamp the expansion pipe 9 or the laying pipe 11 so that back tension can be applied. The pipe pulling device 21a of this example uses a thrust applying device 21 for a pipe, which has a function of a pipe pushing device described later by a single device. An attitude measuring device 22 for measuring the inclination of the pipe is provided at the front end of the laid pipe 11. If the laying pipe 11 shows a tendency to deviate from the predetermined track during the laying of the pipe in FIG. 1C, the thrust imparting device 21 is operated to apply the back tension to appropriately maintain the laying track. Further, when the excavator's capacity becomes insufficient due to the increase in the frictional resistance on the peripheral surface, the thrust applying device 21 functions as the pipe pushing device 21b.
The pushing force is additionally applied to the laying pipe 11 by assisting the excavator 2. Further, when the pipe drawing operation is interrupted or stagnant during the laying of the laid pipe 11, the forward movement operation by the excavator 2 and the backward movement operation by the thrust applying device 21 are continuously repeated to reduce the resistance due to the pipe drawing. Then, the retraction and the retraction of the pipe by the excavator 2 are smoothly performed. Such work can be performed not only on the laid pipe described above but also on the expanded pipe.

Next, FIG. 2 shows a case where the laying pipe is pulled in by the expansion pipe which also serves as the excavation pipe and is laid. In FIG. 2 (a), a drill pipe 15 is used as an expansion pipe, and a rotary bit 16 is provided as a drilling device at the front end in order to serve also for excavation. Send the drill pipe 15 by the excavator 2 installed on the ground,
Excavate and lay in an arc. Next, as shown in FIG. 2B, the bit 16 of the drill pipe 15 is removed, and the hole expanding cutter 17, the reamer 18, and the swivel 19 which are expansion and cutting devices are connected in series, and the rotary device is rotated. By connecting the laying pipe (main pipe) 20 to the rear end and pulling it while rotating the drill pipe 15 with the excavator 2 on the ground, the thrust and the rotational force are transmitted to the hole expanding cutter 17, and the hole is expanded and laid. Pull in the pipe 20. The laying pipe 20 is released from rotation due to the presence of the swivel 19. In this example, the above-described thrust applying device 21 for the pipe is installed on the arrival side, and a posture measuring device 22 for measuring the inclination of the pipe is provided at the front end portion of the laying pipe 20. With these devices, as in the case of FIG. 1, back tension, pulling force, and pushing force can be applied to maintain the pipe on the laying track.

An example of the configuration of the above thrust applying device for a pipe will be described with reference to FIGS. In FIG. 3, a clamp mechanism 24 is attached to a tubular body 23 through which a pipe can be inserted.
Is fixed. The clamp mechanism 24 has a structure in which the tube bodies 25, 25, 25 in three rows are divided into upper and lower parts and can be expanded and contracted by the cylinders 26, 26, 26 on both sides. The clamp mechanism 24 is fixed to the tubular body 23 by the lower half tubular body 2
The side plate 28 fixed to 5 and the side plate 29 fixed to the tubular body 23 are connected by bolts 30.
The clamp mechanism 24 having such a structure can clamp the pipe by expanding and contracting the pipe body 25. The rubber layer 27 on the inner circumference of the tubular body 25 contacts the pipe by the clamp.
The tubular body 23 is connected to a cylinder mechanism 31 that applies thrust. The connection is via a universal joint 32 that rotates about a vertical axis a and a horizontal axis b at a fulcrum. The cylinder mechanism 31 is fixed to the base 33. The connection is a universal joint 34 that rotates about a vertical axis and a horizontal axis at a fulcrum.
Through. By providing the universal joints 32 and 34 in this manner, the pipe can be clamped without any trouble by quickly responding to the movement of the tilt angles in all directions within a certain range. Such a thrust applying device for a pipe can be used as a pipe pulling device, a pipe pushing device, or a pipe pushing / pulling device by a cylinder mechanism in various ways to give back tension, pulling force, or pushing force. it can. When the back tension is applied, the amount of oil supplied to the hydraulic cylinder of the cylinder mechanism 31 is adjusted in response to the pulling force of the machine. When the end of the stroke stroke of the cylinder is reached with the movement of the pipe by the excavator, the clamp on the pipe is released to return to the start end of the stroke stroke of the cylinder, the pipe is clamped, and the back tension can be applied. . A centering roller 35 is provided at the entrance of the tubular body 23 and the clamp mechanism 24 to facilitate the guiding of the pipe. When the diameter of the pipe changes, the pipe of the clamp mechanism is replaced according to the diameter.
In this example, the thrust is applied by using a cylinder mechanism, but a method using a wire and a winch may be used.

[0014]

【Example】

(Embodiment 1) The embodiment of the invention described above with reference to FIG.
This will be specifically described with reference to examples. In FIG. 1 (a),
The horizontal distance between the starting side and the reaching side is about 1000 m.
The excavation pipe 3 is a pilot pipe 4 (diameter 73 m
m), watch over pipe 5 (127 mm diameter)
Consists of. In the figure (b), the expansion pipe 9 (drill pipe, diameter 127 mm) is connected to the excavation pipe 3. Further, in FIG. 3C, the laying pipe 11 (diameter 1000 mm) is connected to the expansion pipe 9. Figure 1 (c)
In the above, since the excavator 2 detects the deviation from the laying track by the measurement signal of the inclination by the posture measuring device 22 during the pulling work of the laying pipe 11 by the pulling force 200t through the expansion pipe 9, The back tension 100t was applied by the thrust applying device 21 to continue the work, and the normal trajectory could be restored, and the effect of the back tension was released.

(Embodiment 2) The embodiment of the invention described above with reference to FIG. 2 will be specifically described with reference to an embodiment. In FIG. 2, the horizontal distance between the starting side and the reaching side is about 1000 m. The expansion pipe 15 (127 mm in diameter) also serves as a pipe for excavation. In addition, in FIG.
The laying pipe 20 (diameter: 1000 mm) is connected to the pipe 5. In FIG. 2B, the excavator 2 is used to expand and cut the pipe 1.
The laying pipe 20 is pulled in with a pulling force of 200 t via the cable 5. (1) Since the load applied to the excavator increased excessively during the retracting work with the retracting force of 200t by the excavator, a pushing force of 200t was imparted by the thrust imparting device to the pipe to facilitate the laying work of the laying pipe. To do. (2) When the excavator pulls in the pulling force of 200t, the excavator is stopped, the work is interrupted, and when the work is restarted, the forward movement of the excavator with the pulling force of 200t and the backward movement of the thrust applying device with the pulling force of 200t are performed. The operation is repeated 5 times to smoothly resume the laying work.

[0016]

The present invention has the following effects. (1) In the method of laying a pipe in the shape of an arc, by applying back tension by a pipe pulling device installed on the arrival side, deviation of the pipe from the laying track during pipe laying can be prevented and corrected in advance. It is possible to properly maintain the track and ensure good construction accuracy. The attitude measuring device can grasp the passing condition of the pipe on the laying track, and can measure the timing for applying and releasing the back tension. (2) In the method of laying a pipe in the shape of an arc in the ground, by applying a pushing force by the pipe pushing device installed on the arrival side, the pipe laying work can be performed in cooperation with the excavator to cope with changes in soil conditions and the like. It can be promoted smoothly and helped to achieve stable construction period. (3) In the method of laying a pipe in an arc in the ground, the pulling force is applied by the pipe pulling device installed on the arrival side, and the pulling force of the excavator is applied, and forward and backward in time to the pipe in pairs. Motion and reverse movement, restarting after interruption of movement when laying a pipe, or during stagnation during movement,
It is possible to reduce or mitigate the increase in the resistance of sediment to the pipe, facilitate the progress of the pipe, and help restart the laying and eliminate the stagnation.

[Brief description of drawings]

FIG. 1 is a diagram illustrating an example of the present invention.

FIG. 2 is a diagram illustrating another embodiment of the present invention.

FIG. 3 is a plan view showing an example of a thrust applying device for a pipe according to the present invention (having the functions of a pipe pulling device and a pipe pushing device).

FIG. 4 is a side view of the thrust applying device for the pipe of FIG.

5A is a view taken along line AA of FIG. 3, and FIG. 5B is a view taken along line BB.

FIG. 6 is a diagram showing a state in which a pipe being laid is out of the laying track.

FIG. 7 is a diagram illustrating a conventional technique.

FIG. 8 is a diagram illustrating another conventional technique.

[Explanation of symbols]

1 river 2 excavator 3 Pipe for excavation 4 pilot pipe 5 Watchover pipe 6 bits (excavator) 7 Hole core measuring device 8 hydraulic motor 9 Drill pipe (expansion pipe) 10 bits (expanding device) 11 Laying pipe 12 swivels 13 reamer 14 Cutter (expanding device) 15 Drill pipe (expansion pipe) 16 Rotary Bit (Excavator) 17 Hole expanding cutter (expanding device) 18 reamer 19 swivel 20 laying pipe 21 Pipe thrust applying device 21a Pipe drawing device 21b Pipe pushing device 22 Posture measuring device 23 Tubular body 24 Clamp mechanism 25 tubes 26 cylinders 27 rubber tube 28 Side plate 29 Side plate 30 volts 31 cylinder mechanism 32 Universal 33 base 34 Universal 35 Centering roller

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-54-63508 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) E21D 9/093

Claims (4)

(57) [Claims] 1. A method of laying an arc-shaped pipe in the ground by non-excavation, wherein an excavator is installed on the ground on the starting side, and a pipe pulling device for pulling the pipe being laid on the ground on the reaching side backward is installed. The excavation machine and the excavation device provided at the front end of the excavation pipe lay the excavation pipe in an arc shape along the planned trajectory, and then connect the expansion pipe to the excavation pipe on the arrival side, The expansion pipe is pulled in by the excavator while expanding by the expansion device provided at the connecting portion between the pipe for expansion and the expansion pipe, and subsequently, the laying pipe is connected to the expansion pipe, and by the excavator. When pulling the laying pipe, the expansion pipe or the laying pipe is clamped by the pipe pulling device, and back tension is applied,
A method for laying an underground pipe in an arc shape, which comprises adjusting the laying track of the expansion pipe or the laying pipe. 2. A method of laying an arc-shaped pipe in the ground by non-excavation, wherein an excavator is installed on the ground on the starting side, and a pipe pulling device for pulling the pipe being laid on the ground on the reaching side backward is installed. The excavator and the excavating device provided at the front end of the expansive pipe that also serves as the excavating pipe are laid in an arc along the planned trajectory, and then the laying pipe is laid on the expansive pipe on the arrival side. When the digging machine pulls the laying pipe while the digging machine is connected to the digging pipe and the laying pipe while the digging machine is installed in the connecting portion between the digging pipe and the laid pipe, A method of laying a pipe in an arc in the ground, which comprises applying tension to adjust a laying track of the laying pipe. 3. A method of laying an arc-shaped pipe in the ground by non-excavation, wherein an excavator is installed on the ground on the starting side, and a pipe pulling device for pulling the pipe being laid on the ground on the reaching side backward is installed. The excavation machine and the excavation device provided at the front end of the excavation pipe lay the excavation pipe in an arc shape along the planned trajectory, and then connect the expansion pipe to the excavation pipe on the arrival side, The excavating machine pulls in the expansible pipe while expanding the excavating machine provided in the connecting portion between the expansive pipe and the expansive pipe, and subsequently connects the laying pipe to the expansible pipe, When pulling the laid pipe by, or in the method of laying the pipe in an arc shape in the ground by non-excavation, the excavator on the ground on the starting side, the pipe pulling device to pull the pipe being laid on the ground on the reaching side backward Set up,
The expansion pipe is laid in an arc shape along a planned trajectory by the excavator and an excavation device provided at the front end of the expansion pipe that also serves as the excavation pipe, and then the laying pipe is laid on the expansion pipe on the arrival side. It was ligated, in case of pulling the laying pipe by該掘proceeds machine with拡削by拡削device provided in a connecting part between the enlarged cutting pipe and the laying pipe, wherein in the retracted
If the progress of the linked拡削pipes and laying pipe has been stopped or stagnant, to the拡削pipe and the laying pipe, after performed alternately pulling operation by pulling operation and the pipe pulling device according to the excavator A method of laying a pipe in the shape of an arc in the ground, which restarts the drawing of these pipes by the excavator. 4. A posture measuring device for measuring the inclination of the pipe is provided at the front end of the laying pipe, and the orbit of the laying pipe is controlled while monitoring the posture of the front end of the laying pipe when retracted. A method of laying the pipe according to claim 1, claim 2, or claim 3 in the shape of an arc.