JPH03194276A - Device for rearranging buried pipe and correcting its advancing direction - Google Patents

Abstract

PURPOSE:To maintain space, in which a following new pipe is inserted, in a straight linear shape by advancing a movable protruding member to correct the advancing direction of a crushing head even when arrangement of an old pipe is bent, in the case of laying the new pipe while crushing the buried old pipe. CONSTITUTION:A crushing head 2 is advanced with a new pipe 5 while crushing an old pipe 4, buried in the ground, by propulsive impulse force of an impulse propulsive machine 9. Now when arrangement of the old pipe 4 is bent to the lower or upper due to local subsidence or the like of the ground, the new pipe 5, for instance, is placed in a buried condition tilted downward. When the crushing head 2, as it is advanced, changes the direction downward more than permissible, the direction of the crushing head 2 is quickly corrected with reaction force of a movable protruding part 10 in a lower part side by advancing it from a surface of a head nose 2c through action of a fluid pressure jack 11. Thus, the new pipe, buried in the ground, can be buried in the desired straight linear shape as far as possible.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a device for replacing underground pipes and correcting their traveling direction. Specifically, the present invention relates to a device for re-laying underground pipes and correcting the traveling direction thereof. On the other hand, it is possible to install new pipes without having to worry about them, while the new pipes can be laid while maintaining the desired position even if the old pipes are buried in a different state. The present invention relates to a device for changing the direction of travel and correcting the traveling direction.

[Prior Art] In recent years, many types of pipes related to domestic water, gas, and electricity are being laid underground, and road construction is also progressing rapidly. Such roads often have sewer pipes buried across or along them. Many of the old buried pipes are ceramic pipes, etc., and may need to be replaced due to deterioration due to long-term use or due to new larger diameter pipes. In such cases, it would be desirable to be able to bury the new pipe in a manner that does not impede the passage of cars and other traffic.

For this reason, a replacement method that avoids digging up the road has been used for some time. As an example,
As described in Publication No. 73, etc., there is a known construction method in which an old pipe is broken, a new pipe is inserted in the position of the old pipe, and fragments of the old pipe are left in the ground around the new pipe.

An example of this type of construction method will be explained for the hour wheel 1 based on FIG. 11. Two bits 15 and 18 are formed in advance on both sides of the road 16, and a new pipe 5 such as a humid pipe is lowered, and a jack 13 and a traction rod 22 for pulling the new pipe 5 into the ground are lowered. do. The size of the bit can be kept to the minimum size necessary to successively add new pipes, towing roso I, etc. in the pit. A pulling rod 22 is inserted into the old pipe 4 from the bit 15 on the side reinforced with the concrete wall 17, etc., and its tip is connected to the bit 1.
It is added until it reaches 8. In the focus 18, the crushing head 4 is connected to the tip of the pulling rod 22 via a wire 40 or the like.
1 is attached, and then the retraction rod 42 and the backing plate 3 are attached.
1, a new pipe 5 is towed.

On the other hand, in the figure, an impact propulsion device 9 is installed after the crushing spatula F41, which not only ruptures the old pipe 4 with the pulling force of the jack 3, but also moves the blow with compressed air from the near compressor 20. The rupture of the old pipe 4 is also promoted using the impact force of the child.

Therefore, when the impact propulsion device 9 is activated and the jack 13 is activated to pull the crushing head 41, the old pipe 4 is broken by the conical surface of the crushing head 41 that moves with an impact, and , the new pipe 5A is inserted underground. Then, the old pipe 4 becomes a fragment 4a and is left around the new pipe 5A. - When one new pipe 5A enters the underground 3, the next new pipe 5B is lowered at the bit 18. The drag rod 22 that came out on the bit 15 is cut, the backing plate 31 is removed on the pin 18, and the next retracting rod 42 that has been inserted in advance into the new pipe 5B is connected, and the new pipe 5B is placed in front. It is connected after the new pipe 5A. A backing plate 31 is attached after the new pipe 5B, and a retraction rod 42 is fixed with a nut or the like. On the other hand, in the bit 15, the jack 13 again holds the cut end of the traction rod 22. When the jack 13 operates, the new pipe 5B is also drawn into the underground 3. When such operations are repeated in sequence, the tip of the new tube 5A reaches the bit 15, and the device cutting is completed.

The new pipe 5 can be laid by using either the impact type propulsion device 9 or the jack 13 for advancing means, while avoiding digging up the topsoil in which the old pipe 4 was buried.

By the way, the old pipe 4 shown in Figure 11 has deteriorated over the years and has become partially bent downwards, as shown in part of the old pipe 4 shown in Figure 9, due to deterioration and local ground subsidence. This is often the case.

In such a case, the 4ii M-type propulsion unit 9 shown in FIG.
The crushing hent-41, which moves forward with the propulsion impact force from the ground and the traction force of the jack 13, traces a trajectory along the old pipe 4 where the resistance in the ground is small, and moves while changing its direction of movement downward. As a result, the new pipe 5 laid underground 3 is
If the posture deviates from the desired linear arrangement or if the tube is too long to bend, it becomes impossible to insert and bury the new tube.

As a solution to this kind of problem, Utility Model Application No. 6431.
There is a pneumatic direction correction device described in Japanese Patent No. 192.

In this device, a plurality of resistance plates protruding toward the outer circumference of the propulsion device body are provided at the rear of the pneumatic propulsion device body, which has a chisel attached to the front end. Then, when the direction of movement of the propulsion machine body is directed downward, the upper resistance plate at the rear is protruded to generate unbalanced resistance, and the direction of movement of the propulsion machine body is corrected upward. That's what I do.

In addition, in the pneumatic percussion type excavator disclosed in Japanese Utility Model Application Publication No. 63-86189, a plurality of single-opening units are installed at predetermined intervals in the circumferential direction on the outer circumferential surface of the casing at the front of the excavator. A pressing plate is provided. When the main body of the excavator is turned upward, the pressing plate on the lower side is opened to one side and protrudes, and a direction correction horn is generated by the dowel acting on the tapered surface of the pushing plate.

[Problem to be solved by the invention]

As in the former example described above, if a resistance plate that operates when the propulsion device main body changes direction is provided at the rear of the main body, the direction change operation will be delayed. On the other hand, in the latter example, although the pressing plate is installed at the front of the excavator, the surface of the pressing plate that is protruded by opening one side is a tapered surface, so there is no sudden increase in resistance, and the direction change effect is not achieved. There are problems with thinning and the hinge mechanism of the pressing plate becoming larger.

Both measures are applied to excavation work in which the impact type propulsion machine directly advances underground, but in the example shown in FIG.
1 and the new pipe 5, and when burying the new pipe 5 while crushing the old pipe 4 with the crushing head 41, it is impossible to adopt this idea, and the attitude change in that case is impossible. It is desirable to develop a new mechanism for this purpose.

The present invention was developed in view of the above-mentioned problems, and its purpose is to crush old pipes buried in the ground while crushing subsequent new pipes using the propulsion impact force from the impact type propulsion machine attached to the crushing head. When the crushing head moves along the buried part of the bent old pipe, the direction of movement can be quickly adjusted vertically or horizontally, and the arrangement of the new pipe to be laid is improved. It is an object of the present invention to provide a device for re-laying buried piping and correcting its traveling direction, which allows buried piping to be buried so that it becomes as straight as possible.

[Failure to solve the problem]

The present invention involves crushing an old pipe buried underground with a moving crushing head, inserting a new pipe pulled by the crushing head into the buried position of the old pipe, and laying the new pipe underground. Applicable to piping replacement equipment.

Its features include, with reference to FIGS. 1 and 2, an impact-type propulsion device 9 fitted into the hollow part 2a of the crushing head 2 in order to apply a propulsion impact force to the crushing head 2; A head nose 2C provided at the tip of the head 2 and inserted into the old tube 4, and a support that extends from the head nose 2C in a direction perpendicular to the forward direction and adjusts the advancing direction of the crushing head 2. a movable protruding member 10 that generates force;
A fluid pressure jack 11 that advances and retreats the movable protruding member 10 toward the old pipe inner wall 4b is provided, and when the advancing direction of the crushing head 2 is bent, the direction of the crushing head 2 is corrected by advancing the movable protruding member 10. Then, crushing head 2 and new pipe 5
This makes it possible to maintain linear progression.

[For production]

The impact type propulsion device 9 is fitted with the new pipe 5A connected to the hollow part 2a of the crushing head 2 that is in contact with the old pipe 4 (see Fig. 6) that opens into one of the pits. Activate. A propulsive impact force by a striker reciprocating inside the impact type propulsion device 9 is transmitted to the crushing head 2, and the crushing head 2 moves forward while crushing the old pipe 4 in the underground 3 together with the new pipe 5A. When the new tube 5A replaces the old tube 4, the new tube 5B is lowered into the bit after the new tube 5A has advanced and is connected to the rear part of the new tube 5A. The impact type propulsion device 9 is operated again to crush the old pipe 4 while also drawing the new pipe 5B into the underground 3. By repeating the same operation, the old tube 4 is sequentially replaced with the new tube 5 up to the other focus.

By the way, the array of buried old pipes 4 may be bent downward or upward due to local ground subsidence or the like (see Fig. 9). The crushing head 2 that pulls the new pipe 5 crushes the old pipe 4 while crushing the old pipe 4 with the least resistance.
Because there is a tendency to proceed along the buried part of the
The new pipe 5 is laid in an undesired position, for example, buried in a downwardly inclined position. When the crushing head 2 is deflected more than permissible as it moves forward, the hydraulic jack 11 (
5], the lower movable protruding member 10 is advanced from the surface of the head nose 2c in a direction perpendicular to the forward direction. The advanced movable protruding member 10 is attached to the inner wall 4 of the old pipe.
The direction of the crushing head 2 is corrected by taking the reaction force b or by earth pressure.

When the crushing head 2 is returned to a predetermined posture, it is moved forward by the impact force of the impact type propulsion a9 or the like. If the advance direction is maintained, the movable protruding member IO that has been advanced is retreated. Therefore, the new pipe 5 maintains the desired linear movement and is laid in the position where it should originally be buried even if some of the old pipes 4 are partially bent. In addition,
The same applies when the old pipe 4 is bent upward, and if the movable protruding members 10 are attached to the left and right, even when the old pipe 4 is bent left and right, the direction of movement of the crushing head 2 can be corrected. I can do it.

〔Effect of the invention〕

According to the present invention, without digging up roads, etc., with the propulsion impact force from the impact type propulsion machine attached to the crushing head,
New pipes can be laid smoothly while crushing old pipes buried in the soil. At that time, even if the arrangement of the buried old pipes is bent or deformed and the crushing head advances in an undesired direction along the buried part of the old pipes, the movable protruding member advances to crush the old pipes. Quickly correct the direction of head movement,
The space into which the subsequent new tube is inserted can be maintained in a straight line. As a result, the new pipe to be laid underground can be buried in a desired straight line as much as possible.

〔Example〕

Hereinafter, the present invention will be explained in detail based on examples thereof.

FIG. 1 is an overall vertical cross-sectional view of an old pipe 4, which is a buried pipe, being replaced with a new pipe 5 by the re-laying device 1 of the present invention. The device 1 includes a crushing end 2, an auxiliary connecting pipe 6 integrated with the crushing head 2 via a connecting member 7, a new pipe 5 connected to the rear part 6a of the auxiliary connecting pipe 6, and a retracting rod 21. It is composed of a traction member 8 consisting of a backing plate 31, and an impact propulsion device 9 fitted into the hollow part 2a of the crushing head 2 (see Fig. 2). The head nose 2C is inserted into the old pipe 4.
A plurality of movable protruding members 1010 shown in FIG. 2 that can advance in a direction perpendicular to the forward direction from
A fluid pressure jack 1 that advances and retreats toward the old pipe inner wall 4b
1, and in this example, two hydraulic jacks 13.13 for pulling the crushing head 2 and the subsequent auxiliary connecting pipe 6 and new pipe 5 (see Fig. 112). ] and the like.

The jack 13.13 described above is installed in the pit 15 on the side from which the crushing head 2, auxiliary connecting pipe 6, etc. are pushed out. This is a concrete wall 1 that reinforces the soil surface around the tip of an old pipe 4 buried underground 3 across a road 16.
7 etc. while taking the reaction force, crushing head 2. Collect the impact type propulsion device 9, auxiliary connecting pipe 6, etc. In addition to the propulsion impact force generated by the impact propulsion device 9, the new pipe 5 is transferred to the old pipe 4.
This generates a traction force that pushes it into the position where it was. Note that in the pit 15, the removed auxiliary connecting pipe 6 is also dismantled, so the minimum focusing length necessary for that purpose is secured.

In this example, the above-mentioned auxiliary connecting pipe 6 is divided into three short pipes 6A to 6B (see Figure 2) for easy transportation, and the assembled length is the same as that of the new pipe 5. It is designed to be shorter than that.

The pit 18 on the side where new pipes 5 such as auxiliary connecting pipes 6 and humid pipes following the crushing head 2 is inserted into the underground 3 is used to lower the new pipes 5 one by one in a horizontal position, or to insert the auxiliary connecting pipes 6 into the ground. It is large enough to be assembled. In this pit 18, an impact propulsion device 9 cooperating with the traction means 14 on the pit l-+5 side is fitted into the crushing head 2. Therefore, a near compressor 20, which is a supply source of compressed air for operating the impact propulsion device 9, is installed on the ground near the bit 18. In addition, in this pit 18, work is also performed to connect the new pipe 5 to the auxiliary connecting pipe 6 with the pull-in rod 21.

As shown in FIGS. 2 and 3, the crushing head 2 includes a central conical portion 2d, a cylindrical base portion 2e formed at the rear thereof, and a small diameter portion formed at the front portion of the conical portion 2d. A hollow part 2a is formed inside. The maximum outer diameter of the conical portion 2d is approximately the same as the outer diameter of the auxiliary connecting pipe 6 and the new pipe 5, but is slightly smaller than the toric body 23 of the auxiliary connecting pipe 6, which will be described later. Ru. Further, the conical end portion of the impact type propulsion device 9 is fitted into the conical surface 2f formed in a part of the hollow portion 2a, and the impact force of the striking element (not shown) reciprocating inside is fitted. , can be transmitted to the crushing head 2. When the crushing head 2 having such a structure moves forward underground 3, the head nose 2c enters the inside of the old pipe 4 and guides the path, and while crushing the old pipe 4 from the end with the conical part 2d, A space is formed into which the subsequent auxiliary connecting pipe 6 and new pipe 5 are inserted.

In this example, a traction means 1 consisting of a jack 13, 13 and a traction rod 22 is provided on the bit 15 side (see FIG. 1).
4, a relay member 2g is fitted inside the tip of the helad nose 2c of the crushing head 2, and the relay member 2g
A joint member 2h that is locked to is attached, and the traction rod 22 is connected through this. Therefore, the pulling force of the jack 13° 13 acts on the crushing head 2 to pull the auxiliary connecting pipe 6 and the new pipe 5. In addition, since the fluid pressure piping 19 of the fluid pressure jack 11 extends forward from the head nose 2c, a hydraulic device, a switching valve, etc. for supplying high pressure fluid to this fluid pressure piping 19 are installed on the bit 15 side. Ru.

On the other hand, in the three-part auxiliary connecting pipe 6 interposed between the crushing head 2 and the new pipe 5, the short pipe 6A is connected to the following short pipes 6B and 6.
It is said to be thinner than C. This is to encourage partial deformation of the auxiliary connecting pipe 6 when correcting the direction of movement of the crushing head 2, thereby making it easier to follow the direction change operation of the crushing head 2. However, if the auxiliary connecting pipe 6 does not need to be deformed, any of the short pipes may be made thick. A reinforcing toric body 23 is integrated with the outer periphery of the tip of the short pipe 6A by welding or the like.
The front outer periphery of the crushing head 3 is formed into a conical shape that is an extension of the conical surface 21 of the crushing head 2.

As a result, the auxiliary connecting pipe 6 and the new pipe 5 are connected to the crushing head 2.
It is inserted into the space formed by the

A partition wall 25 is integrated at the rear of the short pipe 6A, and a central hole 25a bored therein supports the rear part of the impact type II; , 25b (see FIG. 3) are holes through which the connecting member 7 is inserted.

A stepped portion 26 is formed at the distal end of the short tube 6B, and is fitted into the rear end of the short tube 6A, and a stepped portion 27 is formed at the rear end, which is fitted into the distal end of the short tube 6C.

A contact plate member 28 is attached to the rear end surface 27a of the stepped portion 27 so as to be sandwiched between the short pipe 6C. There are two connecting members 7 between this plate member 28 and the crushing head 2.
7 is inserted, and the crushing head 2 and the short tubes 6A, 6B are integrated through threaded portions at each end. Short tube 6A
A buffer member 29 made of rubber material or the like is attached to the overlapping portion between the crushing head 2 and the crushing head 2 to prevent the impact force of the impact type propulsion device 9 from being directly transmitted to the auxiliary connecting pipe 6 and the new pipe 5 at the rear.
The short pipe 6A and the crushing head 2 are designed to be able to be bent at that portion.

An annular interposed plate member 6b is brought into contact with the rear end of the short pipe 6C connected to the short pipe 6B, and a holding tube 6D is integrated with the interposed plate member 6b. This holding tube 6D is surrounded by a buffer member 30 such as a rubber material, and is adapted to hold the new tube 5 by coming into contact with the front end edge of the new tube 5 or its inner circumference. This buffer member 30 deforms together with the buffer member 29 and functions to absorb not only the axial deformation of the auxiliary connecting pipe 6 but also the entire or partial bending. Note that when a thick auxiliary connecting pipe that cannot be deformed in the axial direction is employed, the front and rear buffer members 29 and 30 deform together and act to absorb the bending.

A bracket 8a is fixed to the rear surface of the above-mentioned contact plate member 28 by welding or the like, and is rotatably connected to a joint member 8b.
A retraction rod 21 is attached. As shown in FIG. 1, a backing plate 31 is brought into contact with the rear end of the new pipe 5, and the retracting rod 21 is fixed with a nut 8C, so that the short pipe 6C and the new pipe 5 are integrated into the auxiliary connecting pipe 6. be done. When most of the new pipe 5A enters the underground 3, this patch plate 31 is removed, and the next new pipe 5 etc. is attached to the rear part of the preceding new pipe 5 in the same manner, and the attached drawing rod 21 patch plate 31
is fixed and preparations are made for the next progression.

7 8 In order to protect the exposed part of the buffer member 30 located inside the tip of the new pipe 5, an annular member 32 spanning the short pipe 6C and the new pipe 5 is attached as shown in FIG. .

On the other hand, as shown in FIG. 4, the head nose 2C of the crushing head 2 is provided with vertical insertion holes 24, 24.
Two bodies 1. are extrapolated from above and below to it. OA and their main bodies 1. Support legs integrally formed at each tip of the OA 1.
A movable projecting member 1.0.10 consisting of an OB is provided. The main body 10A is attached to a hydraulic jack 11 inserted into the head nose 2C from the rear of the crushing head 2.

As shown in FIG. 5, the bulging surface 10a extending in the axial direction of the head nose 2C attached to the support leg 10B has a bent front and rear end, and when the movable protruding member 10 is retracted, the old tube It has a circumferential surface that fits within 4 [see Figure 4]. The fluid pressure jack 11 is a cylinder 11.to which fluid pressure piping 19 is connected at two locations, upper and lower. It consists of a piston A, a piston IIB, and a screw I and a piston IIC. The fluid pressure piping 19 for supplying high-pressure fluid extends from the pit 15 side (see FIG. 1) located in the advancing direction of the crushing head 2, as described above. The hydraulic jack II is inserted from the rear of the crushing head 2, and is inserted through the insertion hole 24 below the crushing head 2.
Insert the movable protruding member 10 from the piston rod IIC.
Nita (after concubine, por 1), is unified with Ob.

If the crushing head 2 is advanced along the buried part of the old pipe 4 and its direction is inclined downward, for example (see Fig. 9), the pressure fluid supplied and discharged from the fluid pressure pipe 19 is , piston 1 ], introduced into the upper side chamber of B,
The lower movable protrusion member 10 is advanced downward perpendicular to the forward movement direction together with the piston rod 11C. Then, when the support leg 10B presses the old pipe inner wall 4b, the crushing head 2 is
A supporting force is generated that pushes it up in one direction, and the direction of the crushing head 2 is corrected upward by the supporting force.

By the way, a peephole (not shown) is provided in the backing plate 31 on the pit 18 side, and a light emitter or a reflector is attached to a visible position on the rear end surface of the crushing head 29 0 . As shown in FIG. 9, the light spot 33 received through the peephole is projected onto the crosshair 34 of the measurement lens installed at the focal point 18, and the deviation of the projected position determines whether the beam will be crushed.・It is now possible to know whether or not the throat 2 is tilted and its degree.

Using the buried pipe bedding device configured as described above, while correcting the direction of the crushing head 2 according to the procedure described below, the new pipe 5 can be quickly removed from the old pipe 4 so that it is in the desired position and attitude.
and the equipment can be adjusted.

As shown in FIG. 6, a bit 15 is formed and its soil surface is reinforced with a concrete wall 17. Then, the towing rod 22 is inserted into the buried old pipe 4 while sequentially connecting it with a joint or the like, and is extended until it reaches the other bit 18. In the bit 18, the joint member 2h between the rear end of the towing port/nod 22 and the crushing head 2 is
are connected. At this time, the short pipe 6A of the auxiliary connecting pipe 6 is connected to the crushing head 2 via the buffer member 29 (see FIG. 2).
is attached. A short pipe 6B is connected to the rear part of the short pipe 6A by a connecting member 7 via a contact plate member 28. In this state, as shown in FIG. 2, the hollow part 2a of the crushing head 2
The impact type propulsion device 9 is inserted into the conical surface 2f, its tip is fitted onto the conical surface 2f, and the air hose 36 attached to the rear is extended rearward and connected to the port of the near compressor 20 (see Figure 1). Ru.

On the other hand, in the bit 15, the tip of the pulling rod 22 is
Jack 13. via the traction fitting 35. Attached to I3. After applying the crushing head 2 to the opening of the old pipe 4 as shown in FIG. 6, the jack 13 is extended while taking a reaction force with the concrete wall 17, and compressed air is supplied to the impact type propulsion device 9 to provide a propulsion impact. generate force. The traction force of the traction means 14 acting together with the propulsive impact force causes the auxiliary connecting pipe 6 to
The conical part 2d of the crushing head 2 is inserted into the space of the buried part of the old pipe 4, and as shown in FIG. advanced to. Note that the fragments 4a of the old pipe 4 crushed by the crushing head 21 2 are left underground 3. Incidentally, the pulling force of the jack 13 is static, and if the impact force from the impact propulsion device 9 is added, the breakage of ceramic pipes, etc. will be accelerated.

The progress of the crushing head 2 is temporarily stopped, and the short tube 6C with the intervening plate material 6b is attached to the rear of the short tube 6B. A buffer member 30 is attached to the outer periphery of the holding tube 6D, and the front end of the new tube 5A is fitted onto the holding tube 6D via the buffer member 30.

By inserting the retracting rod 21 and connecting it to the joint member 8b, attaching the backing plate 31 to the rear of the new pipe 5, and fastening the retracting rod 21 with the nut 8C on the back of the backing plate 3I, the crushing head 2. The auxiliary connecting pipe 6 and the new pipe 5 are integrated.

In this state, the propulsive impact force and the traction force are applied again, and the crushing head 2 resumes its advance. When the new pipe 5A enters the underground 3, the new pipe 5B is connected to the rear part of the new pipe 5A by the same procedure. In this way, the new pipes 5A, 5B, etc. are inserted as shown in FIG. The spacer 3B is inserted between the concrete wall 17 and the press fitting 37.

The jack 13 is extended again, and each time the maximum stroke is reached, the spacers 38 are increased one after another as shown in FIG. When one new tube 5 is inserted, all the spacers 38 are removed, and even if a short-stroke jack 13 is used, the new tubes 5 can be pulled in one by one in the same manner.

If the old pipe 4 between the pits 15 and 18 has been deformed as shown in FIG. The crushing head 2 advances as if guided by the bent old pipe 4. Advance the crushing head 2 through the old pipe 4
If the new pipes 5A, 5B, etc. are left as they are guided, they will either be buried in a crooked manner, or they will not be able to be inserted and buried. Therefore, assuming that a part of the old pipe 4 has caved in as shown in the figure, the crushing head 2 is guided by the old pipe 4B and begins to bend. If the amount of bending is small and within the allowable range, it is sufficient to move it forward. The amount of bending at this time is monitored by a measuring device provided on the focus 18 side. For example, light spot 33
If it is at the center of the crosshairs as shown in the lower right corner of FIG. 9, or if the displacement does not reach the allowable limit line 39 shown by a broken line, it is moved forward as it is.

As shown in FIG.
When the tolerance limit 39 is exceeded as shown in the lower left of the figure, the direction of movement of the crushing head 2 is corrected. At this time, high pressure fluid is supplied to the upper side chamber of the fluid pressure jack 11 by operating a valve connected to the fluid pressure piping 19 . As shown in FIG. 5, when the piston IIB moves downward, the movable protrusion member 10 attached to the piston rod IIC also moves, and the support leg 10B moves toward the inner wall of the old pipe as shown by the two-dot chain line.
b and presses the old pipe 4B. The supporting force generated by the pressure pushes the head nose 2C, which is about to tilt downward, upward as shown by the two-dot chain line in FIG. 10, and the orientation of the crushing hent 2 is corrected. Therefore, the auxiliary connecting pipe 6 and the new pipe 5, which are not shown in solid lines and accompany the crushing head 2, remain horizontal, and the new pipe 5 is arranged in a desired straight line.
will be laid down. Note that in the pit 18, it is visually confirmed that the light spot 33 has returned to the center of the crosshair 34. In this state, forward movement is resumed, and if the displacement of the light spot 33 is small, the supply of high-pressure fluid is stopped by operating the valve.

In addition, if the auxiliary connecting pipe 6 is deformable,
When the crushing head 2 is deflected upward, the short tube 6A of the auxiliary connecting pipe 6 deforms slightly to accommodate the deflection. Of course, bending can also be absorbed by deforming the buffer members 20 and 30 interposed before and after the auxiliary connecting pipe 60. Therefore, by utilizing the bending of the auxiliary connecting pipe 6 itself and the deformation of the buffer members 29 and 30, the crushing spatula F2
A large change in direction is possible. If the auxiliary connecting pipe 6 cannot be bent or deformed, the bending is allowed by the deformation of the buffer members 29 and 30.

5 6 In both cases, the straightness of the new tube 5 is maintained, and the angular difference between the crushing head 2 and the new tube 5 is absorbed.

Even if the buried old pipe 4 is partially bent upward, it can be dealt with using the same operation. If the bend is in the left-right direction or diagonally, two sets of fluid pressure jacks (not shown) may be provided in front and behind the rad nose 2C.

A movable protruding member that moves vertically and retractably is attached to the front, and a movable protruding member that moves horizontally and retractably is attached to the rear, and the movable protruding members 10 and 10 disposed on the upper, lower, left, and right sides are moved forward and backward.

In the above example, the auxiliary connecting pipe 6 has a three-part structure, but if it can be lowered into the bit 18 as a whole,
It may be made into an integrated object. Although this auxiliary connecting pipe 6 is not absolutely necessary and is not shown, a new pipe 5 may be connected to the rear part of the crushing head 2 via a buffer member 29. In addition to the impact type propulsion device 9, the jack 13
However, if the crushing head 2 can be propelled only by the propulsion impact force of the impact type propulsion device 9, there is no need to pull the crushing head 2 from the bit 15 side.

[Brief explanation of drawings]

Fig. 1 is an overall sectional view to which the underground pipe replacement device of the present invention is applied, Fig. 2 is a connection structure diagram of the crushing end and auxiliary connecting pipe, and Fig. 3 is the line III-III in Fig. 2. 4 is a sectional view taken along the line IV-IV in FIG. 2, FIG. 5 is an explanatory diagram of the mounting structure and operation of the movable protruding member, and FIGS. 6 to 8 are bedding materials for buried piping. FIGS. 9 and 10 are explanatory views of the operation, and FIGS. 9 and 10 are explanatory views of the bending of the old pipe and the direction change operation of the crushing head. FIG. 11 is a sectional view illustrating the operation of the conventional device. 2-Crushing head, 2a hollow part, 2cm head nose,
3-underground, 4.4A, 4B-old pipe, 4b inner wall, 5.5A
, 5B-New pipe, 9-Impact propulsion device, 10 Movable protruding member, 11 Fluid pressure jack.

Claims (1)

[Claims] (1) While crushing the old pipe buried underground with the advancing crushing head, a new pipe pulled by the crushing head is inserted into the buried position of the old pipe, and the new pipe is laid underground. In the pipe replacement device, an impact propulsion device is fitted into the hollow part of the crushing head in order to apply a propulsive impact force to the crushing head, and an impact propulsion device is installed at the tip of the crushing head and charged into the old pipe. a movable protruding member that extends from the head nose in a direction perpendicular to the advancing direction and generates a supporting force for adjusting the advancing direction of the crushing head, and the movable protruding member is attached to the inner wall of the old pipe. a hydraulic jack for advancing and retracting the crushing head, when the advancing direction of the crushing head is bent,
correcting the direction of the crushing head by advancing the movable protruding member;
A device for replacing underground piping and correcting its traveling direction, characterized by being able to maintain the linear progression of a crushing head and a new pipe.