JPH0432194B2 - - Google Patents

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 relates to a method for replacing buried pipes that can be replaced.

[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 and the like buried 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 stated in Japanese Patent Publication No. 60-27873,
A known construction method involves breaking an old pipe, inserting a new pipe in its place, and leaving fragments of the old pipe underground around the new pipe.

This construction method will be briefly explained based on FIG. 9. Two pits 12,1 are placed in advance on both sides of the road 13.
5 is formed, the new pipe 10 is lowered, and the new pipe 1
The jack 5 and towing rod 7 for pulling the 0 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. within the pit.
A traction rod 7 is inserted into the old pipe 3 from the pit 12 on the side reinforced with a concrete wall 14, etc., and is extended until its tip reaches the pit 15. In the pit 15, a crushing head 27 is attached to the tip of the pulling rod 7 with a wire 18, etc., and then the new pipe 10 is pulled through the retracting rod 17 and the backing plate 23.

The crushing head 2 is activated by operating the jack 5, etc.
7, the old pipe 3 is broken by the conical surface of the crushing head 27, and the new pipe 10 is inserted into the ground. The old pipe 3 becomes a 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 to the pit 12 is cut, the backing plate 23 is removed from the pit 15, and the new pipe 10A is removed.
The retracting rod 17 that has been inserted in advance is connected, and the new pipe 10A is connected after the preceding new pipe 10B. A caul plate 23 is attached to the rear of the new pipe 10A and secured to the retracting rod 17. On the other hand, in the pit 12, the jack 5 again holds the cut tip of the traction rod 7. 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 relining is completed. In addition, in the figure, an impact propulsion device 9 is installed after the crushing head 27, and it not only breaks the old pipe 3 with the pulling force of the jack 5, but also uses a blower that moves with the compressed air from the air compressor 16. The rupture of the old pipe 3 is also promoted using the impact force of the pipe 3. Regardless of the breaking method, the new pipe is laid without digging up the topsoil in which the old pipe was buried, and the old pipe is left underground as fragments.

On the other hand, Japanese Unexamined Patent Publication No. 62-25697 describes a replacement method in which an old pipe is pushed out when a new pipe is inserted. In this case as well, the old pipe and new pipe are moved by operating the jack in almost the same procedure as above, the old pipe that has been pushed out is recovered, and the new pipe is buried in the position where the old pipe was. Ru.

[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 pipe is removed, so
This avoids damage when inserting a new tube due to remaining debris, but if the old tube is old, it will collapse during extrusion and it will no longer be possible to recover the old tube. . In addition, if the collapsed old pipe remains, it becomes even more difficult to insert a new pipe, and the replacement 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. 10, if the old pipe 3 is bent at the connection 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, and it may cause damage to the new pipe. There is a problem that smooth burying of the new pipe is impaired, such as the insertion position being undesirable.

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 a new pipe, and can facilitate the work of replacing old and new pipes.

[Means to solve the problem]

As shown in FIG. 1, the method for replacing buried pipes of the present invention involves pushing out old pipes 3 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 large sheath pipe 4 having an inner diameter larger than the outer diameter of the old pipe 3 is inserted into the old pipe 3 in the underground 2, and while pushing out the large sheath pipe 4 and the old pipe 3,
The new pipe 10 is inserted and laid.

In the second invention, as shown in FIG.
A sheath tube 25 having an outer diameter smaller than the inner diameter of the old tube 3
into the old pipe 3 in the underground 2, and insert the large sheath pipe 4 having an inner diameter larger than the outer diameter of the old pipe 3 into the old pipe 3 in the underground 2, and insert the large sheath pipe 4 into the old pipe 3 in the underground 2. The old tube 3 is enclosed between the lesser sheath tubes 25, and the new tube 10 is inserted and laid while pushing out the greater sheath tube 4, the old tube 3, and the lesser sheath tube 25 at the same time.

[Effect]

In the first invention, the large sheathed pipes 4 having an inner diameter larger than the outer diameter of the old pipe 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 sheath pipe 4 along with the old pipe. Thereafter, the new pipe 10 is inserted and laid into the space excluded by the large sheath pipe 4 while pushing the rear ends of the large sheath pipe 4 and the old pipe 3. The large sheath pipe 4, the old pipe 3, and the cut soil are collected in the other pit, and as a result, the old pipe 3 is completely replaced with the new pipe 10 without being left underground 2.

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 fitted and inserted into all the old pipes 3 in the underground 2 from one pit,
Correct the posture of old pipe 3 whose connection part was bent due to earth pressure. Next, the large sheathed pipes 4 having an inner diameter larger than the outer diameter of the old pipes 3 are sequentially connected and fitted and inserted into all the old pipes 3 in the underground 2, and the old pipes 3 and small sheathed pipes are inserted into the large sheathed pipes 4. The soil around the old pipe 3 is also included together with the sheath pipe 25. Thereafter, with the old tube 3 enclosed, the new tube 10 is inserted and laid into the space excluded by the major sheath tube 4 while pushing the rear ends of the major sheath tube 4 and the minor sheath tube 25. The large sheath pipe 4, the old pipe 3, the small sheath pipe 25, and the cut soil are collected in the other pit, and as a result, the old pipe 3 is completely replaced with the new pipe 10 without being left underground 2.

〔Effect of the invention〕

In the first invention, when replacing the old and new pipes, the old pipes are collected into the main sheath pipe, and no fragments of the old pipes are left underground. You will not be harmed by contact with.

In the second invention, in addition to the above effects,
The minor sheath tube is inserted into the old tube in advance, and its posture is corrected so that the entire old tube is almost straight, so when fitting and inserting the major sheath tube into the old tube, Insertion into the pipe becomes easier, and the work of replacing old and new pipes is greatly facilitated.

〔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 underground pipe resurfacing method according to the first invention is implemented by a resurfacing device 1. This device 1 includes two hydraulic jacks 5 for pulling in a large sheath pipe 4 that is fitted over an old pipe 3 buried underground 2, and for pushing out the large sheath pipe 4 together with the old pipe 3. 5, etc., a pressing head 8 connected to the traction means 6 via a traction rod 7, an impact propulsion device 9 integrated into the pressing head 8, and a new pipe attached to the pressing head 8. 10.

The above jack 5 is installed in the pit 12 on the side where the old pipe 3 such as a ceramic pipe is pushed out, and reinforces the soil surface around the tip of the old pipe 3 buried underground 2 across the road 13. This system generates a force that collects the large sheath pipe 4 and the old pipe 3 and pushes the new pipe 10 into the position where the old pipe 3 was while taking a reaction force with the concrete wall 14 and the like. In addition, this pit 12
At this point, the extracted large sheath tube 5 is cut, so the pit 12 has the minimum length necessary for that purpose.

Large sheath pipes such as steel pipes 4 and new pipes such as Huyum pipes 1
The pit 15 on the side into which the 0 is inserted has a length that allows one large sheath pipe 4 or a new pipe 10 to be lowered, and is approximately the same length as the pit 12 described above. In this pit 15, when inserting the large sheath pipe 4 etc. into the ground, an impact type propulsion device 9 is used to assist the pulling force of the traction means 6 and to apply an impact to smooth the insertion into the ground. It is attached to the pressing head 8 mentioned above. An air 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 large sheath pipe 4 to be inserted underground, the connection of the new pipe 10 that follows, and the connection of the retraction rod 17 constituting the retraction means 11 are also performed.

A wire 18 is hung around a pin shaft 8a provided at the tip of the pressing head 8, and the pressing head 8 moves forward when the jack 5 is extended. The main body 8A of the pressing head 8 has a conical shape, and its outer diameter is approximately equal to the outer diameter of the large sheath tube 4. As a result, when inserting the large sheath pipe 4 into the underground 2, its end face can be pushed in by the main body 8A, and when inserting the new pipe 10, an insertion space for the new pipe 10 is secured. The tip of the above-mentioned impact type propulsion device 9 is fitted into this pressing head 8, and the impact force of a striking element (not shown) reciprocating inside can be applied to the large sheath tube 4 via the pressing head 8. I'm starting to be able to do it.

With the re-laying device 1 having the above configuration, it is possible to bury the new pipe 10 while collecting the old pipe 3 in the following manner.

As shown in FIG. 2, a pit 12 is formed, and its soil surface is reinforced with concrete walls 14. Then, the traction rod 7 is inserted into the buried old pipe 3, and 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 8 is attached to the tip of the traction rod 7 that comes out 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 jack 5 is extended while taking the reaction force from the concrete wall 14, the large sheathed pipe 4 is pushed into the underground 2 so as to be fitted and inserted into the old pipe 3 due to the pulling force as shown in Fig. 3, and the large sheathed pipe 4 is inserted into the old pipe 3. Not only the old pipe 3 but also the soil around the old pipe 3 is taken into the pipe 4. 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 pressure head 8 is also removed from the traction rod 7. The next large sheath tube 4 is lowered into the pit 15, and the threaded portion (not shown) formed at its tip is
It is screwed into the threaded portion at the rear of the preceding large sheath tube 4.
A pressing head 8 is attached to the rear of the large sheath pipe 4,
After that, the same operation as described above is repeated. In addition, if the impact type propulsion device 9 is also operated, the main sheath tube 4
The insertion into the underground 2 is made smoother by the impact force. When the large sheath tube 4 is fitted and inserted so as to enclose all the old tubes 3, the new tube 10 is attached behind the pressing head 8, as shown in FIG.

At the rear of the pressing head 8, a wire 22 serving as the retracting means 11, a retracting rod 17 shown in FIG. 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 8 pushes out the large sheath pipe 4 and the old pipe 3, and inserts the new pipe 10 into the position where the old pipe 3 was. insert. The outer diameter of the pressing head 8 is approximately the same diameter, either slightly larger or slightly smaller than the outer diameter of the new pipe 10, and the new pipe 10 is smoothly inserted into the space after the large sheath pipe 4 has been removed. .

When one new pipe 10 enters the underground 2, the large sheath pipe 4 and the traction rod 7 are pushed out along with the old pipe 3 to the pit 12 side by the length thereof, so remove the traction rod 7 from the jack 5 and separate them. The tip of the towing rod 7 is then reattached to the jack 5. In the pit 15, remove the cover plate 23 of the new pipe 10 inserted into the ground, and as shown in FIG.
is lowered, and the tip of the retractable rod 17A is connected to the rear end of the preceding retractable rod 17B using a connecting fitting or the like. Leading new pipe 10B and following new pipe 10A
A backing plate 23 is attached to the rear part and secured to the retractable rod 17A. When new pipes 10 are added and inserted one after another in this way, all the old pipes 3
is pushed out together with the surrounding soil, and the new pipe 10 is buried in that position. Note that when inserting the new pipe 10, if the impact type propulsion device 9 is driven by compressed air supplied through the hose 24 connected to the air compressor 16, the insertion operation will be made easier. Needless to say.

According to this replacement construction method, the old pipe 3 and its fragments will not remain underground 2, and even if the old pipe 3 is in a state where it is easy to collapse, the large sheath pipe 4 will enclose the old pipe 3. The old pipe 3 can be removed without any problems, and damage to the new pipe 10 that may occur if the old pipe 3 or its fragments remain is avoided. Since the outer diameter of the new pipe 10 is approximately equal to the outer diameter of the large sheathed pipe 4 or the outer diameter of the pressing head 8, the new pipe 10
There will be no voids around the . By the way, if the new pipe 10 is considerably larger than the old pipe 3, the diameter of the large sheath pipe 4 should also match the diameter of the new pipe 10, but the large sheath pipe 4 is slightly larger than the old pipe 3. The diameter of the pressing head 8 may be increased according to the diameter of the new pipe 10.

FIG. 6 shows an example in which the small sheath tube 25 is inserted into the old tube 3 in advance by the pressing head 26 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, steel pipes etc. When the sheath tubes 25 are connected and inserted one after another by welding, etc.,
The bent posture is corrected into a substantially straight line as shown in FIG. As shown in Figure 6, the canal 25
is inserted into all the old pipes 3, and as shown in FIG. Insertion into the tube 3 becomes extremely smooth. And the eighth
As shown in the figure, by attaching the new tube 10 after the press head 8 and moving the press head 8 forward, the large sheath tube 4, the small sheath tube 25, and the old tube 3 sealed between them are pushed out. The new tubes 10 are successively inserted and buried in the spaces formed by the large sheath tubes 4.

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 an impact 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 drawings]

Fig. 1 is an overall vertical cross-sectional view of the state in which the buried pipe re-laying method of the present invention is being implemented, Figs. 2 to 5 are explanatory diagrams of the operation in the first invention, and Figs. 6 to 8 are An explanatory diagram of the operation in the second invention, Fig. 9 is a sectional view of an example in which the conventional underground pipe re-laying method is applied, and Fig. 10 shows a state in which the posture of the old pipe is corrected by inserting a sheath pipe. FIG. 2...Underground, 3...Old pipe, 4...Great sheath pipe, 10
...new canal, 25...canal.

Claims (1)

[Scope of Claims] 1. In a buried pipe re-laying method in which an old pipe buried underground is extruded and a new pipe is inserted into the buried position of the old pipe to replace the old and new pipe, A buried pipe characterized by fitting and inserting a large sheath pipe having an inner diameter larger than the diameter into the old pipe underground, and inserting and laying the new pipe while pushing out the large sheath pipe and the old pipe. Piping replacement method. 2. In the buried pipe replacement method, which involves extruding an old pipe buried underground and inserting a new pipe into the buried position of the old pipe to replace the old and new pipe, the outer diameter of the pipe is smaller than the inner diameter of the old pipe. Insert and insert the small sheath pipe into the old underground pipe, fit and insert the large sheath pipe having an inner diameter larger than the outer diameter of the old pipe into the old underground pipe, and connect the large sheath pipe with the small sheath pipe. A method for replacing buried pipes characterized by enclosing the old pipe between the sheath pipes and simultaneously pushing out the large sheath pipe, the old pipe, and the minor sheath pipe while inserting and laying the new pipe.