JPH0432197B2 - - 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 in the ground around the new pipe.

This construction method will be briefly explained based on FIG. 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
A jack 5 and a towing rod 7 for pulling 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 or the like, and is extended until its tip reaches the pit 15. In the pit 15, a crushing head 34 is attached to the tip of the pulling rod 7 via a wire 18 or the like, and the new pipe 10 is then pulled via the retracting rod 17 and a backing plate 28.

The crushing head 3 is activated by operating the jack 5, etc.
When 6 is pulled, the old pipe 3 is broken by the conical surface of the crushing head 36, 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 28 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 28 is installed after 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 36, and it not only breaks the old pipe 3 with the traction force of the jack 5, but also uses an impactor that moves with 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. 11, if the old pipe 3 is bent at the connection part 3M due to the action of earth pressure, etc.
There are problems in that a large amount of force is required to pull out the old pipe 3, and the insertion position of the new pipe is undesirable, which impairs smooth burying of the new pipe.

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, which can be recovered in a short period of time, and which 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 involves removing an old pipe 3 (see Fig. 2) buried underground 2, and installing a new pipe 10 in the buried position of the old pipe 3.
It is applied to the method of replacing underground piping by inserting a pipe and replacing the old and new pipes. The feature is that the old pipe 3
A sheath pipe 4 having an inner diameter larger than the outer diameter of the sheath pipe 4 is fitted onto and inserted into the old pipe 3 in the underground 2, and at the time of insertion, the whole old pipe 3 is cut and accommodated, and the sheath pipe 4 is cut off. The old pipe 3 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.

[Effect]

The sheath pipes 4 having an inner diameter larger than the outer diameter of the old pipe 3 are connected one after another, and the old pipe 3 in the underground 2 is connected from one pit.
Fit and insert into the outside. As the insertion progresses, the old pipe 3 in the underground 2 is cut, and the sheath pipe 4 encloses the entire cut old pipe 3 and the excavated soil around it.

Next, the inside of this sheath pipe 4, the cut old pipe 3, and the excavated soil are pushed out, and a new pipe 10 with an outer diameter smaller than the inner diameter of the sheath pipe 4 is inserted into the sheath pipe 4 left underground 2.・Laying. At this time, the cut old pipe 3 and 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〕

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 new pipe will not be damaged by contact with the old pipe fragments. Furthermore, 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 become pieces, so the sheath pipe can move straight, and the new The pipes are also laid straight, making the work of replacing 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 vertical cross-sectional view of a state in which the buried pipe resurfacing method according to the present invention is carried out by a resurfacing device 1. This device 1 consists of a sheath pipe 4 that is fitted onto an old pipe 3 buried underground 2 (see Figure 2).
While pulling in the sheath pipe 4A or cutting the old pipe 3,
A traction means 6 consisting of two hydraulic jacks 5, 5, etc. for pushing out the old pipe 3 which has become the debris 3a inside, and a pushing force connected via a traction rod 7 of the traction means 6. A head 8, an impact propulsion device 9 integrated into the pressing head 8, and a retracting means 11 for attaching a new pipe 10 to the pressing head 8.
It consists of

The jack 5 is installed in the pit 12 on the side where old pipes such as ceramic pipes are pushed out, and reinforces the soil surface around the tip of the old pipe 3 buried underground 2 across the road 13. While taking a reaction force with a concrete wall 14 or the like, a force is generated to collect the sheath pipe 4 and the cut old pipe and push the new pipe 10 into the sheath pipe 4 left underground 2. Note that in this pit 12, the pulling rod 7 that comes out when inserting the new pipe 10 into the sheath pipe 4 is removed or cut, so the minimum length necessary for that is done in the pit 12. It is secured.

Sheath pipes such as steel pipes 4 and new pipes such as Huum pipes 10
The pit 15 on the side into which the sheath pipe 4 or the new pipe 1 is inserted is
The length is such that one 0 can be lowered, and the length is approximately the same as the pit 12 described above. In this pit 15, when inserting the sheath pipe 4 etc. into the underground 2,
An impact type propulsion device 9 is attached to the pressing head 8 to assist the pulling force by the traction means 6 and to apply an impact to smooth the insertion into the underground 2. 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 sheath pipe 4 to be inserted into the ground, 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 this pressing head 8M has a cylindrical shape that can reliably push out the cut old pipe 3 and excavated soil in the sheath pipe 4, and its outer diameter is slightly smaller than the inner diameter of the sheath pipe 4. It's summery. The outer diameter of the pressing head 8N (see Figure 2) used to insert 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 the striking element (not shown) reciprocating inside the pressing head 8M is applied to the pressing head 8M.
It is also designed to act on the cut old pipe 3 via the pipe. Also, when inserting the sheath pipe 4 into the underground 2, a striking force can be applied to the pressing head 8N if necessary.

On the other hand, among the sheath pipes 4 inserted into the underground 2, the leading end of the sheath pipe 4A shown in FIG.
A cutter 19 for cutting the old pipe 3 is provided. In this example, as shown in FIG. 3a, the upper and lower ends of the cutter body 19A are fixed inside the sheath tube 4, and the cutting edge 19a cuts the old tube 3 shown by the imaginary line in the left-right direction. It is becoming possible to do this. The wire 18 is passed through the hole 20 passing through the cutter body 19A, and as the jack 5 expands, the sheath pipe 4 is inserted into the ground 2 via the traction rod 7, the wire 18, and the cutter body 19A. Incidentally, the cutting edge 19a may be horizontal as shown in FIG. 3b, 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, as shown in FIGS. 3c and d, the cutting edge 19a may be tilted forward or the third
As shown in FIG.
The sheath tube 4 may be preceded by the sheath tube 9a. 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 re-laying 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 soil surface is reinforced with concrete walls 14. Then, the traction rod 7 is inserted into the buried old pipe 3, and the traction rods 7 are successively connected by welding or the like until reaching the other pit 15. In the pit 15, a wire 18 is connected to the tip of the pulling rod 7, and the tip of the wire 18 is attached to the cutter body 19A of the leading sheath tube 4A.

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. At this time, the cutting edge 19a of the cutter 19 cuts and breaks the old pipe 3 from the end surface. For example, the large and small fragments 3a broken in the left and right direction are placed in the space 23 on the side of the cutter body 19A.
[See Figure 3a], the soil around the old pipe 3 is taken into the sheath pipe 4A, and when the stroke of the jack 5 reaches its maximum, the jack 5 is reduced, and the concrete wall 14 and the pressing fitting 24 are taken in. A spacer 25 is inserted between them. The jack 5 is extended again, and this is repeated to form one sheath tube 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 into the pit 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. Thus, the tip of the new sheath tube 4B is integrated with the auxiliary ring 26 fixed to the rear end of the preceding sheath tube 4A by welding or the like.
If the auxiliary ring 26 is attached to the sheath tube 4, when the conical portion 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. Incidentally, as shown by imaginary lines in FIGS. 2 and 4, a pressing head 8N is installed after the sheath tube 4.
If the impact-type propulsion device 9 is attached and operated, cutting of the old pipe 3 by the cutter 19 becomes easier due to the impact force of the striker reciprocating inside.

As shown in FIG. 6, when the leading 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 corresponding to the internal space volume of the old pipe 3 is left inside the sheath pipe 4. ing. The above-mentioned pressing head 8N is replaced with a pressing head 8M for pushing out the cut old pipe 3 in the sheath pipe 4 and excavated soil. The cutter 19 and wire 18 taken out by cutting the tip of the sheath tube 4A are removed, and the shortened traction rod 7 is also removed from the traction fitting 22. Pitt 12
From there, the traction rod 7 is inserted into the sheath tube 4 with space left.
are inserted and extended toward the pit 15 while being successively added.

In the pit 15, a wire 18 is connected to the tip of the pulling rod 7, and as shown in FIG.
The cylindrical front surface of the pressing head 8M is applied to the rear end opening of the sheath tube 4 via a. After the impact-type propulsion device 9 is attached as necessary, the new pipe 1 is installed after the pressing head 8M via the wire 27 which is the retracting means 11, the retracting rod 17, the patch plate 28, etc.
0 is attached. The jack 5 is extended in the same way as when inserting the sheath pipe 4 into the ground 2, and the pressing head 8M pushes out the debris 3a and excavated soil stored in the sheath pipe 4 while pushing the new pipe 10 into the sheath pipe 4. Insert into. 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 towards the pit 12, so remove the traction rod 7 from the jack 5 and cut each piece. etc., and reattach the tip of the traction rod 7 to the jack 5. At the pit 15, remove the patch plate 28 of the new tube 10 inserted into the sheath tube 4, lower the next new tube 10A into which the retractable rod 17A has been inserted, and remove the retractable rod 10A, as shown by the imaginary line in FIG. 17A
Connect the tip of the rod to the rear end of the preceding retractable rod 17B using a connecting fitting or the like. The preceding new pipe 10B and the following new pipe 10A are connected, a backing plate 27 is attached to the rear part, and they are secured to the retractable rod 17A. In this way, when the new pipes 10 are successively inserted, all the old pipes 3 and excavated soil that have become fragments 3a in the sheath pipe 4 are transferred to 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. Furthermore, when inserting the new pipe 10, if the impact propulsion device 9 is driven by compressed air supplied through the hose 29 connected to the air compressor 16, the removal operation will be made easier. Needless to say.

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

According to this re-laying method, the sheath pipe 4 is placed underground 2.
However, since it contains the old pipe 3 and excavated soil that have become large and small fragments 3a, these fragments 3
a will not remain underground 2, the old pipe 3 can be removed without any hindrance, and damage to the new pipe 10 that may occur if fragments 3a of the old pipe 3 remain is avoided. be done. Note that the outer diameter of the new tube 10 is smaller than the inner diameter of the sheath tube 4 and is approximately equal to the outer diameter of the pressing head 8M, so the new tube 10 after insertion is
A gap is created between the sheath tube 4 and the inner surface of the sheath tube 4. If the gap is large, inject mortar etc.
The new tube 10 may be fixed within the sheath tube 4, and if the gap is small, a spacer 30 may be interposed around the outer periphery of the new tube 10, as shown in FIG.

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 in combination with an impact type propulsion device, or by using only 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. 9a shows an example in which a rotary cutter 19 is used, and as shown in FIG. 9b, the cutter roller 31 supports the side surface of a support body 33 that protrudes forward from a support member 32 fixed to the leading sheath tube 4A. It is supported by the plate 34. Note that the vertical height of the cutter rollers 31, 31 is larger than the inner diameter of the old pipe 3, and the cutter rollers 31, 31 are designed to break the old pipe 3 from the inner surface.

The wire 18 is inserted into the support member 32, which has a space at its axial center, and the sheath tube 4A is pulled through the pin 35 of the support member 32 shown in FIG. 9a. 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. 9c, the wire 18A may be attached to the pin 35 so that the pressing head 8N can be pulled at the same time, or the cutter 19 may be protruded in front of the sheath pipe 4A. It may be installed as shown.

[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, Fig. 2 is an explanatory diagram of the operation of the present invention, and Fig. 3 a is a view taken along the - line in Fig. 2. , Fig. 3b is a front view of a different cutter, Fig. 3c is a side view of a cutter with a different shape, Fig. 3d is a view taken along the - line in Fig. 3c, and Fig. 3e is a cutter with the cutter at the top. FIG. 4 is an explanatory diagram of the operation, FIG. 5 is a partial view of the assistance of the sheath tube by an auxiliary ring and the mutual connection of the sheath tubes, FIGS. 6 and 7 9 is an explanatory diagram of the operation, FIG. 8 is a diagram of the intervening state of the spacer, FIG. 9a is an explanatory diagram of the operation when a cutter roller is adopted, FIG. Figure 9c is a side view of different installation examples of cutter rollers, Figure 10 is a cross-sectional view of an example in which the conventional underground pipe re-laying method is applied, and Figure 11 is a side view of an example where the conventional buried pipe replacement method is applied. It is a state diagram where the curve is bent. 2...underground, 3...old pipe, 4...sheath pipe, 10...
...New tube.

Claims (1)

[Scope of Claims] 1. In a buried piping replacement method in which the old pipe buried underground is removed and a new pipe is inserted in the buried position of the old pipe to replace the new and old pipe, A sheath pipe with an inner diameter larger than the sheath pipe is 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 sheath is removed. A method for replacing buried pipes characterized by inserting a new pipe with an outer diameter smaller than the inner diameter of the pipe into a sheath pipe left underground.