JPH01250596A - Replacement of buried piping - Google Patents

Abstract

PURPOSE:To make it possible to replace piping without excavating the surface soil of buried spots by outer fitting and inserting a sheath-like pipe with a minor diameter larger than an outer diameter of an old pipe in the old pipe underground, pushing out the old pipe cut off in the sheath-like pipe and inserting a new pipe. CONSTITUTION:A sheath-like pipe 4 with a minor diameter larger than an outer diameter of an old pipe 3 is successively connected, and is outer-fitted and inserted in the old pipe 3 underground 2 from one pit. The old pipe 3 underground 2 is cut off as the insertion goes further, and after cutting off all the old pipe 3 and the excavated soil around it are involved into the sheath-like pipe 4. Subsequently, the old pipe 3 cut off and the excavated soil in the sheath- like pipe 4 are pushed out, and a new pipe 10 with an outer diameter smaller than a minor diameter of the sheath-like pipe 4 is inserted and laid out in the sheath-like pipe 4 remained underground 2. At that time, the old pipe 3 cut off and the excavated soil are collected by the other pit, and as the result, the old pipe 3 is completely replaced by the new pipe 10 without leaving the old pipe 3 underground 2.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for replacing underground pipes, and more specifically, it is a method for replacing underground pipes, etc. without digging up the topsoil of the buried location. This article relates to a method for replacing buried pipes that can replace new pipes.

[Conventional technology]

In recent years, many pipes for domestic water, gas, and electricity have been 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, and after long-term use, they may become obsolete or need to be replaced with larger diameter pipes. In such cases, it would be desirable to be able to bury new pipes so as not to impede traffic such as cars.

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.

This construction method will be briefly explained based on FIG. Two pits 1-12.15 are formed in advance on both sides of the road 13, and the new pipe 10 is lowered, and the jack 5 and tow rod 7 for pulling the new pipe 10 into the ground are lowered. The size of the pit can be kept to the minimum size necessary to successively add new pipes, traction rods, etc. inside the pinto.

Pit 1 on the side reinforced with concrete walls 14, etc.
From 2, the traction rod 7 is inserted into the old pipe 3 and added until its tip reaches the pit 15. pit 15
In this case, a crushing head 36 is attached to the tip of the pulling rod 7 via a wire 18 or the like, and then the new pipe 10 is pulled via the drawing rod 17 and a backing plate 28.

Pull the crushing head 36 by activating the jack 5 (
Then, the old pipe 3 is broken by the conical surface of the crushing head 36, etc.
At the same time, the new pipe 10 is inserted underground. Old pipe 3 is fragment 3a
and is left around the new tube IO. When one new pipe 1O enters the underground 2, the next new pipe 10A is lowered into the pit 15. The traction rod 7 that came out at the pipe throat 12 is cut, the backing plate 28 is removed at the pit 15, and the new pipe 10 is removed.
The retracting rod 17 previously inserted into A is connected, and the new pipe 10A is connected after the preceding new pipe LOB. A backing plate 28 is attached to the rear of the new pipe 10A and secured to the retraction rod 17. On the other hand, in the pit 12, the jack 5 holds the cut end of the towing rod 7 again. When the jack 5 operates, the new pipe 10A is also drawn into the underground 2. When such operations are repeated one after another, the tip of the new pipe 10B reaches the pit 12, and the salutation is completed.

In addition, in the figure, i! is shown after the crushing head 36. A seven-stroke propulsion device 9 is installed, which not only breaks the old pipe 3 with the traction force of the jack 5, but also uses the impact force of the blower moved by compressed air from the near compressor 16 to break the old pipe 3. It also promotes rupture. Regardless of the breaking method, new pipes are laid without digging up the topsoil in which the old pipes were buried, and the old pipes are left underground as fragments.

On the other hand, Japanese Unexamined Patent Publication No. 62-25697 describes a replacement method in which the old pipe is pushed out when inserting the new pipe. In this case too, the old pipe and new pipe are moved by operating the jack in almost the same procedure as above.
The extruded old pipe is recovered and a new pipe is buried where the old pipe was.

[Problem to be solved by the invention]

In the former example mentioned above, if the old pipe is a ceramic pipe, there will be no damage, but depending on the material of the old pipe, the new pipe may be damaged (
Moreover, the fragments are useless and will be left underground as waste, which is not desirable.

In the latter example mentioned above, the old tube is removed, so damage caused by remaining debris when inserting the new tube is avoided, but if the old tube is old, it may be damaged during extrusion. It has collapsed and it is no longer possible to recover the old pipe. In addition, if the collapsed old tube remains, it becomes even more difficult to insert a new tube.
The work itself becomes impossible. As a result, reinforcement such as filling the old pipe with mortar is required, leading to longer construction times and higher work costs (problems).

By the way, as shown in Fig. 11, if the old pipe 3 is bent at the connecting part 3M due to the action of earth pressure, etc., it may take a great deal of force to pull out the old pipe 3, or the new pipe may not be inserted in the desired position. There is a problem that the smooth burying of new pipes is impaired, such as when the new pipes are buried outside.

The present invention was made in view of the above-mentioned problems.The purpose of the present invention is to avoid damage to the surrounding area during insertion of a new pipe, and to ensure that even old old pipes can be completely cleaned when new pipes are installed. To provide a method for replacing buried pipes that can be recovered in a short period of time, and that also ensures straightness when inserting new pipes, thereby facilitating and speeding up the work of replacing old and new pipes. .

[Means to solve the problem]

As shown in Fig. 1, the buried pipe re-laying method of the present invention is as follows:
Remove the old pipe 3 (see Figure 2) buried underground 2,
This method is applied to a buried pipe replacement method in which a new pipe 10 is inserted into the buried position of the old pipe 3 and the old and new pipes are replaced. The feature is that a sheath pipe 4 having an inner diameter larger than the outer diameter of the old pipe 3 is externally fitted and inserted into all the old pipes 3 in the underground 2, and at the time of insertion, all the old pipes 3 are cut. The cut old pipe 3 inside the sheath pipe 4 is pushed out, and a new pipe 10 having an outer diameter smaller than the inner diameter of the sheath pipe 4 is inserted into the sheath pipe 4 left underground 2. That's what I did.

[For production]

The sheath pipes having an inner diameter larger than the outer diameter of the old pipe 3 are successively connected and externally fitted and inserted into the old pipe 3 in the underground 2 from one pin point. As the insertion progresses, the old pipe 3 in the underground 2 is cut,
The entire old pipe 3 after cutting and the excavated soil around it are enclosed in the sheath pipe 4.

Next, the cut old pipe 3 and the excavated soil inside this sheath pipe 4 are pushed out, and a new pipe 1 having an outer diameter smaller than the inner diameter of the sheath pipe 4 is made.
0 is inserted and laid inside the sheath pipe 4 left underground 2. At that time, the cut old pipe 3 and the cut soil are collected in the other pit, and as a result, the old pipe 3 is not left underground 2 and is completely turned into a new pipe.

Replaced.

〔Effect of the invention〕

According to the present invention, when the sheath pipe is externally fitted and inserted into the old underground pipe, the old pipe is cut into fragments, and these fragments and excavated soil are stored inside the sheath pipe. The new pipe will not be damaged by contact with the old pipe fragments, as the pipes are pushed out and no pieces of the old pipe remain in the ground. moreover,
When the sheath pipe is fitted and inserted into the old pipe, even if the old pipe is buried in a crooked position, the old pipe is cut and all pieces are broken, so the sheath pipe can move straight, and the new pipe can also be easily inserted. The pipes will be laid straight, making the process of repairing old and new pipes much easier.

〔Example〕

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

FIG. 1 is an overall longitudinal cross-sectional view of a state in which the method for replacing buried pipes according to the present invention is being carried out by means of a salvage device 1. This device 1 is an old pipe 3 buried underground 2 (see Figure 2).
While pulling in the sheath pipe 4 that is fitted onto the outer wall and cutting the old pipe 3, two hydraulic jacks 5, 5, etc. are used to push out the old pipe 3 that has become a fragment 3a and excavated soil inside the sheath pipe 4A. a traction means 6, a pressing head 8 connected via a traction rod 7 of the traction means 6, an impact propulsion device 9 integrated into the pressing head 8, and a new pipe 1 connected to the pressing head 8.
0, and a retracting means 11 for attaching the

The above jack 5 is installed in a pit 12 on the side where old pipes such as ceramic pipes are pushed out, and is a concrete wall that reinforces the upper surface around the tip of the old pipe 3 buried underground 2 across the road 13. 14, etc., to collect the sheath pipe 4 and the cut old pipe, and generate a force to push the new pipe 10 into the sheath pipe 4 left underground 2. In addition, in this pit 12, the pulling rod 7 that comes out when inserting the new pipe IO into the sheath pipe 4 is removed or cut, so the minimum length necessary for that is the length of the pit 12. is secured.

The pit 15 on the side into which the sheath pipe 4 such as a steel pipe or a new pipe 10 such as a humid pipe is inserted is of a length that allows one sheath pipe 4 or new pipe 10 to be lowered, and has approximately the same length as the pit 12 described above. It's sato. In this pit 15, when inserting the sheath pipe 4 etc. into the underground 2, a (
An impact propulsion device 9 is attached to the pressing head 8 . A near compressor 16, which is a supply source of compressed air for operating the impact propulsion device 9, is installed on the ground near the pit 15. In addition, in this pit 15, the connection of the sheath pipe 4 inserted into the ground, the connection of the subsequent new pipe 1O, and the connection of the drawing rod 17 constituting the drawing means 11 are also performed.

The above-described pressing head 8 has a wire 18 attached to a pin shaft 8a provided at its tip, and is moved forward by the extension operation of the jack 5. The main body 8A of this pressing head 8M has a cylindrical shape that can reliably push out the cut old pipe 3 and excavated soil inside the sheath pipe 4, and its outer diameter is the same as that of the sheath pipe 4.
It is slightly smaller than the inner diameter of. The outer diameter of the pressing head 8N (see Fig. 2) used for inserting the sheath pipe 4 into the underground 2 is made slightly larger than the outer diameter of the sheath pipe 4, and the conical part of the main body 8A presses the sheath pipe 4. The end face is pushed in. Incidentally, the tip of the above-mentioned impact type propulsion device 9 is fitted into the pressing head 8M, and the impact force of a striking element (not shown) reciprocating inside is applied to the pressing head 8M to cut it. Also, when inserting the sheath pipe 4 into the underground 2, if necessary, the striking force is applied to the pressing head 8.
It can be made to act on N.

On the other hand, a cutter 19 for cutting the old pipe 3 in the underground 2 is provided at the tip of the leading sheath pipe 4A shown in FIG. 2 among the sheath pipes 4 inserted into the underground 2. In this example,
As shown in FIG. 3(a), the upper and lower ends of the cutter body 19A are fixed inside the sheath tube 4, and the cutting edge 19a can cut the old tube 3 shown by the imaginary line in the horizontal direction. ing. Note that a hole 20 passing through the cutter body 19A
The wire 18 is passed through, and as the jack 5 expands, the sheath tube 4 connects the pulling rod 7, the wire 18, and the cutter body 19.
It is inserted into underground 2 via A. By the way, the cutting edge 19a
may be horizontal as shown in FIG. 3(b), or may be formed only on the left and right or top and bottom portions by attaching a holding member 21 or the like. Furthermore, Fig. 3 (c
) and (d), move the cutting edge 19a forward (l
As shown in Figure 3(e), the cutting edge 19a
may be made to protrude from the tip of the sheath tube 4A, so that the cutting edge 19a precedes the sheath tube 4 when the sheath tube 4 is inserted into the underground 2. In the case of such a cutter, the old pipe 3 can be cut or broken from the inner surface. In any case, it is sufficient that the cutting edge is located at a position where the old pipe 3 can be reliably cut and crushed.

With the salvage device 1 having the above configuration, it is possible to bury the new pipe 10 while cutting and recovering the old pipe 3 in the following manner.

As shown in FIG. 2, a pit 12 is formed and its upper surface is reinforced with a concrete wall 14. Then, the traction rod 7 is inserted into the buried old pipe 3, and the traction rod 7 is successively connected by welding or the like until it reaches the other pit 15. In the pi-nod 15, a wire 18 is connected to the tip of the traction loft 7, and the tip of the wire 18 is attached to the cutter body 19A that connects to the leading sheath tube 4.

On the other hand, in the pit 12, the tip of the traction rod 7 is attached to the jack 5 via a traction fitting 22. When the jack 5 is extended while taking the reaction force from the concrete wall 14, the sheath pipe 4A is pushed into the ground 2 by its traction force so as to be fitted and inserted into the old pipe 3, as shown in FIG. then,
The cutting edge 19a of the cutter 19 cuts and breaks the old pipe 3 from the end surface thereof.

For example, the large and small pieces 3a broken in the left and right direction are
The soil that was around the old pipe 3 is taken into the sheath pipe 4A from the space 23 on the side of the cutter body 19A (see Fig. 3(a)), and when the stroke of the jack 5 reaches its maximum, the jack 5 is reduced, and a spacer 25 is inserted between the concrete wall 14 and the press fitting 24. The jack 5 is extended again, and this is repeated to form one sheath pipe 4.
A is inserted.

The jack 5 is reduced in size and the spacer 25 is also completely removed.

The next sheath pipe 4 without a cutter is lowered to the pit 1-15, and the threaded part (not shown) formed at its tip is screwed into the threaded part at the rear of the first sheath pipe 4A, as shown in FIG. As shown in FIG. 2, the tip of the new sheath tube 4B is integrated by welding or the like with the auxiliary ring 26 fixed to the rear end of the preceding sheath tube 4A.

In addition, if the auxiliary ring 26 is attached to the sheath tube 4, when the conical part of the pressing head 8N bites into the rear end of the sheath tube 4, deformation of the end of the sheath tube 4 can be suppressed, which is convenient. Good. A pressing head 8N is attached to the sheath tube 4B in the same manner as shown in FIG. 4, and thereafter the same operation as described above is repeated.

In this way, when the pulling means 6 pulls the tip of the leading sheath tube 4A, the straightness of the sheath tube 4 becomes extremely high. By the way, as shown by the imaginary lines in Figures 2 and 4,
If the pressing head 8N is pressed after the sheath pipe 4, and the impact type propulsion device 9 is attached and activated, the old pipe 3 is removed by the cutter 19.
Cutting becomes easier due to the impact force of the internally reciprocating striker.

As shown in FIG. 6, when the first sheath tube 4A reaches the pit 12, the series of insertions of the sheath tubes 4 is completed. At this time,
All the fragments 3a of the old pipe 3 and the soil around them are contained in the sheath pipe 4, but a space equivalent to the internal space volume of the old pipe 3 is left inside the sheath pipe 4. . The above-mentioned pressing head 8
N is replaced with the old pipe 3 after cutting inside the sheath pipe 4 and the pressing head 8M for pushing out the excavated soil. The cutter 19 has been taken out due to the distal end of the sheath tube 4A being cut off.
The wire 18 is removed, and the shortened traction rod 7 is also removed from the traction fitting 22. From the pit 12, the traction rod 7 is inserted into the sheath tube 4 with a space left, and is extended toward the pit 15 while being successively joined.

In the pit 15, a wire 18 is connected to the tip of the pulling rod 7, and as shown in FIG. 7, the cylindrical front surface of the pressing head 8M is applied to the rear end opening of the sheath tube 4 via the pin shaft 8a. After the 1ii thrust type propulsion hand mechanism 9 is attached as necessary, the new pipe 10 is attached to the rear of the pressing head 8M via the wire 27 which is the drawing means 11, the drawing rod 17, the patch plate 28, etc. The jack 5 is extended in the same way as when the sheath pipe 4 is inserted into the ground 2, and the pressing head 8
M inserts the new pipe 10 into the sheath pipe 4 while pushing out the debris 3a and excavated soil contained in the sheath pipe 4. The outer diameter of the pressing head 8M is made slightly smaller than the inner diameter of the sheath pipe 4 and is almost the same as the outer diameter of the new pipe 10, and the outer diameter of the sheath pipe 4 is made slightly smaller than the inner diameter of the sheath pipe 4 and is almost the same as the outer diameter of the new pipe 10. The new tube 10 is smoothly inserted into the interior.

When one new pipe 10 enters the sheath pipe 4, the traction rod 7 is pushed out along with the debris 3a and excavated soil by its length toward the pit 12, so remove the traction rod 7 from the jack 5 and cut each piece. etc., and reattach the tip of the towing rod 7 to the jack 5. In the pit 15, the patch plate 28 of the new pipe 10 inserted into the sheath pipe 4 is removed, and the next new pipe 10A into which the retraction rod 17A has been inserted is lowered, as shown by the imaginary line in FIG. The tip of the rod 17A is connected to the rear end of the preceding retraction rod 17B using a connecting fitting or the like. Connect the preceding new pipe 10B and the following new pipe 10A, attach the backing plate 28 to the rear part, and connect the retracting rod 17.
Tie it to A. In this way, when new pipes 10 are added and inserted one after another, all the old pipes 3 and excavated soil that have become fragments 3a in the sheath pipe 4 are removed from the pressing head 8 having a vertical front surface.
The new tube 10 is pushed out by M, and the new tube 10 is buried in the sheath tube 4. In addition, when inserting the new pipe IO, if the impact propulsion device 9 is driven by compressed air supplied via the hose 29 connected to the near compressor 16, the insertion operation will be made easier. Needless to say.

Incidentally, in the above example, as shown in FIG. 1, the new tube 10 is inserted into the sheath tube 4 while pushing out the old tube 3 inside the sheath tube 4. Old pipe inside 3
The new pipe 10 may be inserted into the sheath pipe 4 left underground 2 after the entire part has been pushed out by the pressing head 8M.

According to such a resurfacing method, the sheath pipe 4 is left underground 2, but since it contains the old pipe 3 and excavated soil that have become large and small fragments 3a, these fragments 3a are left underground 2. The old pipe 3 was removed without any problems.
Damage to the new tube 10, which may occur if the fragments 3a of the old tube 3 remain, is avoided. Note that since the outer diameter of the new tube 10 is smaller than the inner diameter of the sheath tube 4 and approximately equal to the outer diameter of the pressing head 8M, there is no gap between the new tube 10 and the inner surface of the sheath tube 4 after insertion. arise. If the gap is large, the new tube 10 can be fixed inside the sheath tube 4 by injecting mortar, or if the gap is small, the spacer 30 can be inserted into the new tube 10 as shown in FIG. What is necessary is to interpose it on the outer periphery of the.

Incidentally, in the above example, jacks are mainly used to push the sheath tube, new pipe, etc., but it is also possible to use jacks and an impact type propulsion device in combination or only with an impact type propulsion device. Depending on the location where the pipe is to be buried, the soil quality, etc., the device that generates the pushing force may be selected and used as appropriate.

FIG. 9(a) is an example in which a rotary cutter 19 is used, and as shown in FIG. 9(b), the cutter roller 31 protrudes forward from a support member 32 fixed to the leading sheath tube 4A. It is supported by a support plate 34 on the side surface of the support body 33 . Note that the vertical height of the counter rollers 31, 31 is larger than the inner diameter of the old tube 3 (so that the old tube 3 can be broken from the inner surface).

The wire 1 is placed inside the support body 32 whose axial center is a space.
8 is inserted, and the sheath tube 4A is pulled through the pin 35 of the support member 32 shown in FIG. 9(a). At this time, the cutter roller 31 cuts the old pipe 3 by rotating as a result of being pulled by the jack 5 or by being driven by a motor (not shown). Incidentally, as shown in FIG. 9(C), the press head 8N may be pulled at the same time by attaching the wire 18A to the pin 35, or the cutter 19 may be moved forward of the sheath tube 4A. It may be attached so that it protrudes.

[Brief explanation of the drawing]

Fig. 1 is an overall vertical sectional view of the state in which the buried pipe re-laying method of the present invention is being implemented, Fig. 2 is an explanatory diagram of the operation of the present invention, and Fig. 3 (a) is m-m of Fig. 2. Linear view, Figure 3 (b
) is a front view of a different cutter, FIG. 3(c) is a side view of a cutter with a different shape, and FIG. 3(d) is a side view of a cutter with a different shape.
3(e) is a side view of an example in which the cutter is attached to the front end of the leading sheath tube, FIG. 4 is an explanatory diagram of the operation, and FIG. 5 is an auxiliary ring A partial view of the reinforcing of the sheath tubes and the mutual connection of the sheath tubes, Figures 6 and 7 are explanatory diagrams of the operation, Figure 8 is a diagram of the intervening state of the spacer, and Figure 9 (a) uses a cutter roller. Fig. 9(b) is an explanatory diagram of the operation in this case, and Fig. 9(b) is a view taken along the
) is a side view of different installation examples of cutter rollers, Fig. 10 is a cross-sectional view of an example in which the conventional underground pipe re-laying method is used, and Fig. 11 is a side view of an example in which a conventional underground pipe replacement method is used. It is a diagram of a bent state. 2.-underground, 3-old pipe, 4-sheath pipe, 10-new pipe. Patent applicant Kyokuto Kaihatsu Kogyo Co., Ltd. Agent Patent attorney Yoshitoshi Yoshiso (and 1 other person)

Claims (1)

[Claims] (1) In the buried pipe replacement method, which involves removing the old pipe buried underground and inserting a new pipe in the buried position of the old pipe to replace the old and new pipe, A sheath pipe with an inner diameter is externally fitted and inserted into the old underground pipe, and at the time of insertion, all the old pipes are cut and accommodated, and the cut old pipe inside the sheath pipe is pushed out, and the inner diameter of the sheath pipe is A method for replacing buried pipes characterized by inserting a new pipe with a smaller outer diameter into the sheath pipe left underground.