JPH01250594A - 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 large sheath-like pipe with a minor diameter larger than an outer diameter of an old pipe in the old pipe underground and pushing out the old pipe in the large sheath-like pipe to insert a new pipe. CONSTITUTION:A large sheath-like pipe 4 with a minor diameter larger than an outer diameter of an old pipe 3 is successively connected to outer-fit and insert in all the old pipe 3 underground 2 from one pit, and the soil around the old pipe 3 is also involved into the large sheath-like pipe 4 together with the old pipe 3. After that, the rear end of the old pipe 3 in the large sheath-like pipe 4 is pushed out, and a new pipe 10 is inserted into a clearance made by eliminating the old pipe 3 in the large sheath-like pipe 4. While the large sheath- like pipe 4 remains underground 2, the old pipe 3 and cutting off soil are col lected by the other pit; 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 construction method for replacing underground pipes, and more specifically, the present invention relates to a construction method for replacing underground pipes, and more specifically, for replacing underground pipes, etc. with new pipes without digging up the topsoil of the buried location. This article concerns a method for replacing buried pipes that can be admired by the public.

[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 deteriorate 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. 11. Two pits 12 and 15 are formed in advance on both sides of the road 13, and the new pipe 10 is lowered, and the jack 5 and traction rod 7 for pulling the new pipe 10 into the ground are lowered. The size of the pipe and throat can be kept to the minimum size necessary to successively add new pipes, tow ports, throats, etc. within the bit.

Pit 1 on the side reinforced with concrete wall 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
Then, a crushing nod 29 is attached to the tip of the pulling rod 7 via a wire 18, etc., and then the pulling rod 17
The new pipe 10 is towed through the backing plate 23 and the backing plate 23.

When the crushing head 29 is pulled by activating the jack 5, the old pipe 3 is broken by the conical surface of the crushing head 29, etc.
At the same time, the new pipe 10 is inserted underground. Old pipe 3 is fragment 3a
and is left around the new pipe 10. When one new pipe 10 enters the underground 2, the next new pipe 10A is lowered into the pit 15. The traction rod 7 that came out into the pit 12 was cut off,
In the pit 15, the patch plate 23 was removed and a new pipe was installed! OA
At the same time, the new pipe 10A is connected after the preceding new pipe 10B. A backing plate 23 is attached to the rear of the new pipe 10A and secured to the drawing 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 these operations are repeated one after another, new pipe 1
The tip of 0B reaches pit 12, and the salutation is completed.

In addition, in the figure, an impact type propulsion device 9 is installed after the crushing head 29, and it not only breaks the old pipe 3 with the pulling force of the jack 5, but also breaks the blower moving with the compressed air from the near compressor 16. The impact force is also used to promote the breakage of the old pipe 3. 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 as well, the old pipe and new pipe are moved by operating the Ja-7ki in almost the same procedure as above, the old pipe that was pushed out is recovered, and the new pipe is placed in the position where the old pipe was. will be buried.

[Problem to be solved by the invention]

In the former example mentioned above, if the old pipe is a ceramic pipe, it will not be damaged, but depending on the material of the old pipe, there is a risk that it will be damaged when the new pipe advances, and the fragments are useless. This is not desirable as it will be left underground as waste.

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. Therefore, reinforcement such as filling the old pipe with mortar is required, leading to problems such as prolonging construction work and increasing work costs.

By the way, as shown in Fig. 12, if the old pipe 3 is bent at the connecting part 3M due to the action of earth pressure, it may take a great deal of force to break or pull out the old pipe 3, or the insertion position of the new pipe may be incorrect. There is a problem that the smooth burial of new pipes will be impaired, such as undesired pipes.

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. It is an object of the present invention to provide a method for replacing buried pipes, which can be recovered in a short period of time, and furthermore, can ensure straightness when inserting new pipes, and can facilitate 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:
This method is applied to a method for replacing buried pipes in which an old pipe 3 buried underground 2 is pushed out, 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 large sheath pipe 4 having an inner diameter larger than the outer diameter of the old pipe 3 is fitted and inserted into the old pipe 3 underground 2, the old pipe 3 inside the large sheath pipe 4 is pushed out, and the large sheath pipe 4 is inserted into the old pipe 3 underground. A new pipe 10 having an outer diameter smaller than the inner diameter of the sheath pipe 4 is inserted into the large sheath pipe 4 left underground 2.

In the second invention, as shown in FIG. A large sheath pipe 4 having an inner diameter larger than the outer diameter of the pipe 3 is fitted and inserted into the old pipe 3 in the underground 2, and the old pipe 3 and the small sheath pipe 25 inside the large sheath pipe 4 are pushed out simultaneously, and the large sheath pipe 4 is inserted into the old pipe 3 in the underground 2. A new pipe 10 having an outer diameter smaller than the inner diameter of the pipe 4 is inserted into the large sheath pipe 4 left underground 2.

[For production]

In the first invention, the large sheath pipes 4 having an inner diameter larger than the outer diameter of the old pipes 3 are successively connected, and are externally fitted and inserted into all the old pipes 3 in the underground 2 from one pit, The soil around the old pipe 3 is also included in the large sheath pipe 4 together with the old pipe 3. Thereafter, the rear end of the old tube 3 in the large sheath tube 4 is pushed from the above-mentioned focus, and the new tube 10 is inserted into the space created by the removal of the old tube 3 in the large sheath tube 4.

While the large sheath pipe 4 is left underground 2, the old pipe 3 and cut soil are collected in the other pit, and as a result, the old pipe 3 is completely placed in the new pipe 10 without being left underground 2. Can be replaced.

In the second invention, the sheath pipes 25 having an outer diameter smaller than the inner diameter of the old pipe 3 are successively connected, and are fitted and inserted into all the old pipes 3 in the underground 2 from one pit. Correct the posture of the old pipe 3 whose connection part is bent due to pressure. Next, the large sheath pipes 4 having an inner diameter larger than the outer diameter of the old pipes 3 are sequentially connected, and are externally fitted and inserted into all the old pipes 3 in the underground 2, and the old pipes 3 and 3 are inserted into the large sheath pipes 4.
The soil around the old tube 3 is also included together with the sheath tube 25. Thereafter, the rear ends of the old tube 3 and the lesser sheath tube 25 within the greater sheath tube 4 are pushed, and the new tube 10 is inserted into the space created by the removal of the old tube 3 and the lesser sheath tube 25 within the greater sheath tube 4. While the large sheath pipe 4 is left underground 2, the old pipe 3, the small sheath pipe 25, and the cut soil are collected by the other pinto, and as a result, the old pipe 3 is not left underground 2 and is completely removed. It will be replaced with a new pipe 10.

[Effect of the invention] In the first invention, when replacing old and new pipes, the old pipe in the large sheathed pipe that is left underground is recovered, and no fragments of the old pipe are left underground. , the new pipe being installed will not be damaged by contact with debris from the old pipe.

In the second invention, in addition to the above-mentioned effects, the lesser sheath canal is inserted in advance into the old canal, and its posture is corrected so that the entire old canal becomes approximately straight, so that the greater sheath canal When fitting and inserting the large sheath pipe into the old pipe, it becomes easy to insert the large sheath pipe into the ground, and the work of repairing the old and new pipes becomes significantly smoother.

〔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 buried pipe resurfacing method according to the first invention is being carried out using a reveiling device l. This device l is used to pull in a large sheath pipe 4 that is fitted over an old pipe 3 buried underground 2, or to push out the old pipe 3.
A traction means 6 consisting of hydraulic jacks 5, 5, etc., a pressure head 8 connected to the traction means 6 via a traction rod 7, and an impact propulsion device 9 integrated with the pressure head 8. and a retracting means 11 for attaching the new pipe 10 to the pressing head 8.

The jack 5 described above is installed in the pit 12 on the side where the old pipe 3 such as a ceramic pipe is pushed out, and crosses the road 13 and goes underground.
The old pipe 3 and excavated soil inside the main sheath pipe 4 are recovered while taking up the reaction force with the concrete wall 14 that reinforces the upper surface around the tip of the old pipe 3 buried in the main pipe 4, and the new pipe 10 is installed. This generates a force to push the old pipe 3 into its original position. Note that in this pit 12, the pulling rod 7 that comes out when inserting the new pipe 10 into the main sheath pipe 4 is removed or cut, so the minimum length necessary for that is the pit 12. is secured.

The pit 15 on the side into which the large sheath pipe 4 such as a steel pipe or the new pipe 10 such as a humid pipe is inserted is such that one large sheath pipe 4 or the relevant lO can be lowered, and is almost equivalent to the pinto 12 described above. It is the length. In this pit 15, when inserting the large sheath pipe 4 etc. into the ground, the pulling force by the traction means 6 is assisted, A machine 9 is attached to the pressing head 8. A near compressor 16, which is a supply source of compressed air for operating the impact type propulsion machine 9, is installed on the ground near the bit 15. At this time, the connection of the large sheath pipe 4 to be inserted into the ground, the connection of the new pipe 10 that follows, 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 hooked 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 8 has a cylindrical shape that can reliably push out the old tube 3 inside the large sheath tube 4, and its outer diameter is slightly smaller than the inner diameter of the large sheath tube 4. The outer diameter of the pressing head 8N (see Fig. 2) used for inserting the large sheath pipe 4 into the underground 2 is made slightly larger than the outer diameter of the large sheath pipe 4, and the large sheath is inserted into the conical part of the main body 8A. tube 4
The end face of the plate is pushed in. By the way, the tip of the above-mentioned impact type propulsion device 9 is fitted into the pressing head 8M,
The impact force of a striker (not shown) that reciprocates inside is also applied to the old pipe 3 via the pressing head 8M. On the other hand, when inserting the large sheath pipe 4 into the underground 2, a striking force can be applied to the pressing head 8N if necessary.

With the salvage device 1 configured as described above, it is possible to bury the new pipe 10 while 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 towing port/nod 7 is inserted into the buried old pipe 3, and the towing rod 7 is connected by welding or the like until it reaches the other pit 15. In the pit 15, the large sheath tube 4 is inserted through the tip of the traction rod 7, and the pressing head 8N is attached via a wire 18 to the tip of the traction port/nod 7 extending from the rear of the large 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 19. When the concrete wall 14 absorbs the reaction force and extends the jaw 5, the traction force pushes the large sheath pipe 4 into the underground 2 so as to fit and insert it into the old pipe 3, as shown in Fig. 3. Not only the old tube 3 in the large sheath tube 4, but also the old tube 3
The soil around the area is also taken in. Note that when the stroke of the jack 5 reaches its maximum, the jack 5 is reduced and the spacer 21 is inserted between the concrete wall 14 and the pressing metal fitting 20. The jack 5 is extended again, and this is repeated to insert one large sheath tube 4.

The jack 5 is reduced in size, the spacer 21 is completely removed, and the pressing head 8N is also removed from the traction rod 7. The next large sheath tube 4 is lowered to the pinto 15, and the threaded portion (not shown) formed at the tip thereof is screwed into the threaded portion at the rear of the preceding large sheath tube 4, and the screw portion shown in FIG. As shown in FIG.
Then, the tip of the new large sheath tube 4A is integrated by welding or the like.

In addition, when the reinforcing ring 26 is attached to the large sheath tube 4, when the conical part of the pressing head 8N bites into the rear end of the large sheath tube 4, deformation of the end of the large sheath tube 4 can be suppressed. It's convenient to be able to do it. A pressing head 8N is attached to the large sheath tube 4A in the same manner as shown in FIG. 3, and thereafter the same operation as described above is repeated. By the way, FTI attack type semi-progress machine 9
If this action is also added, the insertion of the large sheath pipe 4 into the underground 2 can be made even more smoothly due to the impact force. When the large sheath tube 4 is fitted and inserted so as to enclose all the old tubes 3, the above-mentioned pressing head 8N pushes out the old tube 3 inside the large sheath tube 4, as shown in FIG. The pressure head 8M is replaced with a new pressure head 8M, and a new pipe IO is installed after the pressure head 8M.

At the rear of the pressing head 8M is a wire 2 which is a retracting means 11.
2, retraction rod 17, backing plate 23, etc. are attached,
The new tube 10 is brought into a state in which it can be pulled by the press head 8M. The jack 5 is extended in the same way as when inserting the large sheath pipe 4 into the underground 2, and the pressing head 8M is inserted into the old pipe inside the large sheath pipe 4.
While pushing out the new tube 10, insert the new tube 10 into the large sheath tube 4 at the position where the old tube 3 was located, as shown in FIG. The outer diameter of the pressing head 8M is slightly smaller than the inner diameter of the large sheath tube 4, and is almost the same as the outer diameter of the designated IO, so that the space in the large sheath tube 4 after the old tube 3 is removed is smaller than the inner diameter of the large sheath tube 4. new pipe 10
is inserted smoothly.

When one new tube 10 enters the large sheath tube 4, the traction rod 7 is pushed out along with the old tube 3 by its length toward the focus 12, so remove the traction rod 7 from the jack 5 and cut each. and remove it, and reattach the tip of the towing rod 7 to the jack 5.

In the pit 15, remove the backing plate 23 of the new pipe 10 inserted into the large sheath pipe 4, lower the next new pipe lOA into which the retracting rod 17A has been inserted, and remove it, as shown by the two-dot chain line in Fig. 1. The tip of the retracting rod 17A is connected to the rear end of the preceding retracting rod 17B with a connecting fitting or the like. The preceding new pipe 10B and the succeeding new pipe IOA are connected, a backing plate 23 is attached to the rear part, and they are secured to the drawing rod 17A. When the new pipes 10 are successively inserted in this way, all the old pipes 3 are pushed out together with the surrounding soil inside the large sheath pipe 4 by the pressing head 8M having a vertical front surface, and the new pipes are inserted into the large sheath pipe 4. 10 are buried. In addition, when inserting the new pipe 10, if the impact propulsion device 9 is driven by compressed air supplied through the hose 24 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. 6, the new tube 10 is inserted into the major sheath tube 4 while pushing out the old tube 3 inside the major sheath tube 4. After all of the old pipe 3 in the sheath pipe 4 has been pushed out by the pressing head 8M, the new pipe 10 may be inserted into the large sheath pipe 4 left underground.

According to such a replacement method, the large sheathed pipe 4 is left underground 2, but the old pipe 3 and its fragments do not remain underground 2, and the old pipe 3 is in a state where it is easy to collapse. However, since the major sheath canal 4 encloses the old canal 3, there is no problem (the old canal 3 can be removed from the major sheath canal 4, and no old canal 3 or its fragments remain). Damage to the new tube 10, which may otherwise occur, is avoided.The outer diameter of the new tube 10 is smaller than the inner diameter of the large sheath tube 4, and is approximately equal to the outer diameter of the pressing head 8M. A gap is created between the new tube 10 after insertion and the inner surface of the large sheath tube 4. If the gap is large, fix the new tube 10 inside the large sheath tube 4 by injecting mortar, etc. If the gap is small, a spacer 27 may be interposed around the outer periphery of the new pipe 10, as shown in FIG.

FIG. 8 shows an example in which the small sheath tube 25 is inserted into the old tube 3 in advance by the pressing head 28 before the large sheath tube is fitted onto and inserted into the old tube 3. Inserting into the old pipe 3 is done in the same way as inserting only the large sheath pipe into the ground as described above, but if the old pipe 3 is bent due to earth pressure at the connection part, it is difficult to insert a steel pipe etc. When the sheath tubes 25 are connected and inserted one after another by welding or the like, their bent postures are corrected to approximately straight lines as shown in FIG. 12. With the lesser sheath 25 inserted into all the old canals 3 as shown in FIG. 8, as shown in FIG.
Press head 8N to press the large sheath pipe 4 so that all the old pipes 3 are fitted onto the outside.
When pushing in, the insertion of the large sheath pipe 4 into the underground 2 becomes extremely smooth. Then, as shown in FIG. 10, when a new tube 10 is attached after the replaced pressing head 8M and the pressing head 8M is advanced within the major sheath tube 4, the minor sheath tube 25 and the old tube 3 are pushed out. Then, the new tubes 10 are successively inserted and buried in the large sheath tube 4.

Incidentally, in this example, as shown in FIG.
The new tube 10 is inserted into the large sheath tube 4, but
The head 8 presses all of the old canal 3 and the minor sheath 25 inside the major sheath 4.
After extrusion by M, the new pipe 10 may be inserted into the large sheathed pipe 4 left underground by the pressing head 8M.

Note that in the above two examples, jacks are mainly used to push the major sheath tube, minor sheath tube, and new tube, but this can also be done using only the III thrust 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.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the entire fir tree in a state in which the buried pipe re-laying method of the present invention is being implemented, Figures 2 and 3 are explanatory diagrams of the operation in the first invention, and Figure 4 is a Partial views of reinforcing the sheath pipes and connecting the large sheath pipes to each other, Figures 5 and 6
The figure is an explanatory diagram of the operation in the first invention, Figure 7 is a diagram of the intervening state of the spacer, Figures 8 to 10 are explanatory diagrams of the operation in the second invention, and Figure 11 is a conventional method for replacing buried piping. FIG. 12 is a cross-sectional view of an example in which this method is applied, and is an explanatory diagram of a state in which the posture of the old canal is corrected by inserting the lesser sheath canal. 2-・-underground, 3-old pipe, 4-large sheath pipe, 10-new pipe, 2
5-... lesser sheath. Patent applicant Kyokuto Kaihatsu Kogyo Co., Ltd. Agent Patent attorney Katsutoshi Yoshimura (and one other person) Figure 6 Figure 10

Claims (2)

[Claims] (1) In the buried pipe replacement method in which the old pipe buried underground is pushed out and a new pipe is inserted into the buried position of the old pipe to replace the new and old pipe, the inner diameter is larger than the outer diameter of the old pipe. A large sheathed pipe with a diameter of A method for replacing buried piping characterized by inserting it into a sheath pipe. (2) In the buried pipe replacement method in which the old pipe buried underground is pushed out and a new pipe is inserted into the buried position of the old pipe to replace the new and old pipe, the outer diameter is smaller than the inner diameter of the old pipe. A small sheath pipe having a diameter of A buried piping installation characterized in that the old pipe and the sheathed pipe are extruded at the same time, and a new pipe having an outer diameter smaller than the inner diameter of the sheathed pipe is inserted into the sheathed pipe left underground. Alternative method.