JPH03260487A - Replacing method for embedded multiple pipes - Google Patents

Abstract

PURPOSE:To simultaneously insert a plurality of new pipes in a single replacing operation and accomplish smooth works and cost suppression by grouping old pipes, and inserting new pipes having larger dia. than the old ones in such a way as fitted on the respective old ones. CONSTITUTION:A plurality of new pipes 5 having a larger dia. than the old pipes 4 laid underground are put parallelly and consolidated by welding etc. to form a group of new pipes 5G. A plurality of adjoining old pipes 4 of those embedded in multiple strips are grouped to form a pipe group 4G, and in compliance with each old pipe arrangement of this pipe group 4G, the pipe group 5G is pushed from the tail by an advancing means such as a impact type propelling machine to cause advancing while insertion is made into the group 4G embedded position. Thereby the new pipes 5 are put on the old 4, and the pipe group 4G and surrounding soil are enwrapped with all pipe group 5G. If the enwrapped pipes 4 and soil are taken out to one side pit etc. after laying of subsequent pipes 5 is completed in this manner, removal can be done without leaving any bit underground. As a result, the pipe group 5G can be embedded in lieu of the pipe group 4G smoothly in the embedded position of pipe group 4G.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for relining buried multi-line pipes, and more specifically, to a method in which a group of pipes containing different types of wiring are buried horizontally or three-dimensionally. This invention relates to a method for replacing buried multi-thread pipes that can be replaced with new pipes without digging up the topsoil at the buried location.

[Conventional technology]

In recent years, many types of piping for domestic water, gas, and electricity have been laid underground, and road construction is also progressing rapidly. Such roads often have groups of pipes that house sewer pipes, gas pipes, telephone lines, optical fiber lines, etc. buried across or along them. Many of the old buried pipes are ceramic pipes or polycon FRP.
These pipes may become obsolete due to long-term use and may need to be rejuvenated or replaced with larger diameter ones.

In such cases, it would be desirable to be able to bury the new pipe in a manner that does not impede the passage of cars and other traffic.

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

An example of this type of construction method will be briefly explained based on FIG. 15. Two pits 15 and 18 are formed in advance on both sides of the road 16, and a new pipe 5 such as a humid pipe is lowered, and a jack 13 and a traction rod 22 for pulling the new pipe 5 into the ground are lowered. In addition, the size of the pit is
The size can be kept to the minimum necessary to gradually add new pipes and traction irons in the pit. concrete wall 17
The traction rod 22 is inserted into the old pipe 4 from the side of the pit 15 reinforced with the pipe 4, and is extended until its tip reaches the pit 18. At pit 18, tow rod 2
A crushing head 41 is attached to the tip of the pipe 2 via a wire 40 or the like, and the new pipe 5 is then pulled via a drawing rod 42 and a backing plate 31.

On the other hand, in the figure, an impact type propulsion device 9 is installed after the crushing hent 41, and it not only crushes the old pipe 4 with the traction force of the jack 13, but also reciprocates with compressed air from the near compressor 20. The impact force of the impactor is also used to promote the breakage of the old pipe 4.

Therefore, when the impact propulsion device 9 is activated and the jack 13 is activated to pull the crushing head 41, the old pipe 4 is crushed by the conical surface of the crushing head 41 that moves with an impact. At the same time, the new pipe 5A is inserted into the ground. Then, the old pipe 4 becomes a fragment 4a and is left around the new pipe 5A. - When one new pipe 5A enters the underground 3, the next new pipe 5B is lowered into the pit 18. The pulling rod 22 that has come out to the pit 15 is cut off, the backing plate 31 is removed at the focus 18, and the next pulling rod 42 that has been inserted in advance into the new pipe 5B is connected, and the new pipe 5B takes the lead. It is connected after the new pipe 5A. The backing plate 31 is attached after the new pipe 5B, and the lead-in rod 42 is fixed with a nand 8a or the like.

On the other hand, at the focus 15, the jack 13 again holds the cut tip of the traction rod 22. When the jack 13 operates, the new pipe 5B is also drawn into the underground 3. When such operations are repeated one after another, the tip of the new pipe 5A reaches the pit 15, and the number setting work is completed. The new pipe 5 can be laid by using either the impact type propulsion device 9 or the jack I3 for advancing means, while avoiding digging up the topsoil in which the old pipe 4 was buried.

Incidentally, 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 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 R to be solved by the invention] In the example of JP-A No. 62-25697 mentioned above, when the old pipe is old, it collapses during extrusion, and it is no longer possible to recover the old pipe. It becomes impossible.

In addition, if the collapsed old pipe remains, it becomes even more difficult to insert the new pipe, making it impossible to perform the multi-positioning operation itself. Therefore, it is necessary to strengthen the old pipe by filling it with mortar, etc.
There are problems that lead to longer construction periods and higher work costs.

By the way, as shown in FIG. 16, if the old pipe 4 is inclined or bent with respect to the horizontal line H at the connection part 4M due to the action of earth pressure, etc., it will take a great deal of force to break or pull out the old pipe 4. There is a problem that smooth burying of the new pipe is impaired, such as when the new pipe is inserted in an undesired position.

Furthermore, in recent years, old pipes that house optical fiber cables and other electric wires and are buried in a horizontal or three-dimensional multi-strand format have been found to have relatively small diameter base pipes and are arranged closely together. . Some of these old pipes have been partially deformed due to earth pressure, as shown in Figure 16. If such a group of old pipes is replaced one by one, the new pipes will be placed along the buried remains of the deformed old pipes. In this case, if an undeformed old pipe is nearby, the buried position of the new pipe may be disturbed, or the new pipe may come into contact with or collide with other old pipes or new pipes during the burying operation. Inserting a new tube while attempting to correct the problem requires time, effort, and advanced technology. Therefore, from the perspective of cost savings, when multiple pipes are buried, all old pipes can be placed in the desired layout without being affected by deformation of some of the old pipes. A proposal for a simple construction method that can be replaced with new pipes is desired.

The present invention was made in view of the above-mentioned problems, and its purpose is to avoid damage to the surrounding area as much as possible while inserting a new pipe, and to prevent damage to the surrounding area when installing a new pipe even when the old pipe is old. It is possible to completely recover the old pipes or to crush the old pipes and replace them with new pipes. It is possible to insert a group of pipes while maintaining the desired straightness, and for this purpose, it is possible to insert multiple new pipes at the same time with a - number of position operations, making it possible to carry out efficient construction work. It is an object of the present invention to provide a device construction method for buried multi-thread pipes that can facilitate work and reduce burial costs.

[Means to solve the problem]

INDUSTRIAL APPLICATION This invention is applied to the laying method of the underground piping which inserts a new pipe into the buried position of the old pipe laid underground, and replaces it underground.

The feature is that, with reference to FIG.
(see figure), a new pipe group 5 in which a plurality of new pipes 5 are integrated in advance
G (see Figure 5), and for an old pipe group 4G in which a plurality of adjacent old pipes 4 among the old pipes 4 buried in multiple strips are divided into groups, each of the old pipe groups 4G is In accordance with the old pipe arrangement, the new pipe group 5G is inserted into the buried position of the old pipe group 4G and moved forward, so that each old pipe 4 is fitted with each new pipe 5.

In a different invention, as shown in FIG.
The crushing heads 2 that move forward while crushing are arranged in parallel (see Fig. 12), and the plurality of crushing heads 2 are formed in advance into an integrated crushing hent group 2G, and the old pipes buried in multiple strips are 4, the crushing head group 2G is advanced to the buried position of the old pipe group 4G in accordance with the arrangement of each old pipe in the old pipe group 4G. , on the old pipe remains where each old pipe 4 was crushed by the crushing head 2,
The new pipe 5 is inserted by being towed by the crushing/071 group 2G.

Moreover, instead of integrating the above-described crushing head 2 in advance, a plurality of new pipes 5 may be arranged in parallel with each other, and the plurality of new pipes 5 may be formed into a new pipe group 5G that is integrated in advance. (see Figure 14), for an old pipe group 4G in which a plurality of adjacent old pipes among the old pipes 4 buried in multiple strips are grouped, , the new pipe group 5G with the crushing head 2 attached to the front is advanced to the buried position of the old pipe group 4G, and the old pipe remains ζ where each old pipe 4 was crushed by the crushing head 2 are towed by the crushing head 2. In this case, a new tube group 5G is inserted.

[For production]

A plurality of new pipes 5 having a larger diameter than the old pipe 4 laid underground 3 are arranged in parallel with each other (see Fig. 4), and a new pipe is constructed by integrating the plurality of new pipes 5 by welding in advance. The old pipe group 5G is formed into a pipe group 5G (see Fig. 5). In accordance with each old pipe arrangement of 4G, the new pipe group 5G is pushed from the rear end using an advancing means such as an impact propulsion machine, and is advanced while being inserted into the buried position of the old pipe group 4G.

By advancing, the plurality of new pipes 5 can be fitted into the plurality of old pipes 4, and the old pipe group 4G and surrounding soil are included in all the new pipe groups 5G. In this way, after each of the subsequent new pipes 5 has been laid, if the old pipe 4 and soil contained therein are taken out to a bit on one side, they can be removed without leaving them underground. can do. the result,
A new pipe group 5 will be installed to replace the old pipe group 4G at the buried location of the old pipe group 4G.
G can be buried smoothly.

In addition, if there is one in the old pipe group 4G that has been deformed due to earth pressure, etc., select the old pipe 4 that has not been deformed and install it as one of the new pipes 5 in the new pipe group 5G. match. and,
When the old tube 4 with high straightness is used as an insertion guide and the old tube 4 in the vicinity is also replaced with the new tube 5, the deformed old tube 4
The new pipe group 5G can be buried with desired linearity without being affected by this.

In a different invention, as shown in FIG.
For example, the crushing heads 2 that move forward while crushing the old pipes 4 that have been laid in a Crushing head group 2 integrated in advance by welding etc.
Let G form it.

Then, for an old pipe group 4G in which a plurality of adjacent old pipes among the old pipes 4 buried in multiple strips are grouped, a crushing head group 2G is set according to the arrangement of each old pipe in the old pipe group 4G. It is advanced into the buried position of the old pipe group 4G while being inserted by the pulling force from the front and the pushing force from the rear end.

As it moves forward, the old pipe 4 itself and the soil around each old pipe 4 that have been crushed by the crushing head 2 are removed, and a space is formed in the underground 3. A new pipe group 5G having a larger diameter, the same diameter, or a smaller diameter than each old pipe 4 is inserted into the old pipe trace while being pulled by the crushing head group 2G (see FIG. 13). And the old tube group 4G
When all of the pipes are crushed and all new pipe groups 5G are laid, the installation work for the buried multi-filament pipes is completed.

In addition, if some of the old pipes 4G have been deformed due to earth pressure, etc., select the old pipes 4 that have not been deformed and insert them into one of the crushing heads 2 in the crushing head group 2G. match. Then, if the old tube 4 with high straightness is used as an insertion guide and the old tube 4 in the vicinity is also replaced with a new tube 5 pulled by the crushing head group 2G, it will not be affected by the deformed old tube 4. , the new pipe group 5G can be buried with desired linearity.

Instead of integrating the above-mentioned crushing heads 2 in advance, a plurality of new pipes 5 are arranged in parallel with each other, and the plurality of new pipes 5 are formed into a new integrated pipe group 5G in advance. (See Figure 14). Then, among the old pipes 4 buried in multiple rows, a plurality of adjacent 11" pipes are divided into groups, and the old pipe group 4G is shredded in the front part according to the arrangement of each old pipe in the old pipe group 4G. The new tube group 5G with the head 2 attached is advanced while being inserted into the buried position of the old tube group 4G (see FIG. 13).

If there are old pipes 4G in the old pipe group 4G that have been deformed due to Tonosho etc., it is sufficient to select the old pipes 4 that have not been deformed and match them to one crushing head 2, as in the above case. It is done in the same way.

〔Effect of the invention〕

According to the present invention, a new pipe group, which is an integrated plurality of new pipes that are larger in diameter than old pipes and arranged in parallel, moves forward so as to fit into the grouped buried old pipe groups, and each The new pipes will contain all the old pipes and the surrounding soil. As a result, it is possible to avoid damage to the surrounding area during insertion of the new pipe, and the aged old pipe can be completely recovered when the new pipe is installed. Furthermore, when inserting new pipes, even if some of the old pipes in the group of old pipes are bent due to ground subsidence, we select old pipes with high straightness that have not been deformed, and insert them into one of the new pipes in the group of new pipes. The new pipe group can be advanced by following the old pipe. Therefore, the straightness of the new pipe group after burial is ensured, and the insertion of multiple new pipe groups becomes possible, making it possible to facilitate the work of replacing old and new pipes and to reduce replacement costs.

In a different invention, a crushing head attached to an integrated crushing head group or an integrated new tube group,
A new pipe is pulled into the underground space created by the crushing of the old pipe group and is inserted into the underground space created by the crushing of the old pipe group. Except in the case of extremely soft materials, it is possible to avoid major damage to the surrounding area during insertion of the new tube. On the other hand, the fragments of the old pipe group that were crushed will be left underground, but efficient construction can be realized by inserting multiple new pipes at the same time in - times This will facilitate the process and reduce burial costs.

〔Example〕

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

FIG. 1 is an overall vertical cross-sectional view of the buried multi-filament pipe before starting the multi-thread construction method. Among the existing bits 15 and 18 formed on the concrete surface across the road 16, the mounting device l has
A workbench 7 installed on the bit 18 and an impact propulsion device 9 and other advancement means installed on one new pipe 5 of the new pipe group 5G placed on this workbench 7 are used. . Note that a manhole 10.11 is formed above Pino 1-15.18 through which equipment can be brought in and out and workers can come in and out.

The above-mentioned new pipe group 5G is a humid pipe or steel pipe with a larger diameter than the old pipe 4, and is an integrated structure of a plurality of new pipes 5 that fit into several old pipes 4 buried underground 3. be. The impact propulsion device 9 is attached via the pressing head 6 to the rear end of the new tube 5 of the new tube group 5G, into which the old tube 4 having linearity is fitted.

On the other hand, the many old tubes 4 are tube bodies that house telephone lines, communication lines, and optical fiber lines that transmit different signals. This is, for example, a polygon FRP single tube having a relatively small diameter and a constant length as shown in FIGS. 2 and 3, and is buried with its ends connected by a socket member 4b. The front end of each old tube 4 faces the focus 15 (see Figure 1),
The rear end faces Via 1B, and about 4 to 25 pipes are arranged horizontally or three-dimensionally (in the example shown in Figure 3, nine pipes, three on each side), and are located approximately 500 mm below the road. Nchip
For example, it is often buried with a length of 230 mm.

By the way, even if the old pipes 4 are a collection of 25, now that thinner and more durable optical fiber wires have been developed, it is not necessary to replace all the old pipes 4, but only a selected appropriate number can be used. In some cases, the old book tube 4 is to be placed.

In the present device 1, as shown in FIG. 4, each of the three new pipes 5 fits into each of the three old pipes 4. New pipe 5
When burying the pipes, the new pipes 5 are laid down along the old pipes 4, so when the new pipe group 5G is buried, it will follow the attitude of the old pipe group 4G. Therefore, using an internal inspection device such as an endoscope, the presence or absence of cracks in each of the plurality of old pipes 4 shown in FIG. 3 and the degree of vertical and horizontal bending due to subsidence are confirmed.

If there is an old pipe 4 whose straightness is maintained, the impact type propulsion device 9 is attached to the new pipe 5 to be fitted into it.

By the way, the old pipe 4 at the top, middle 5, and bottom tier shown in Figure 3
are grouped into old pipe groups 4G, 4G2, and 4G3, for example. When a new pipe group 5G consisting of three new pipes 5 is fitted into the old pipe group 4G at the top of each old pipe group 4G, the earth pressure due to the insertion of the new pipes 5 and the weight of the new pipes 5 Old pipe group 4 on the lower side
Gz, 4G: I was affected, and the old pipe group 4G before being replaced
z, 4Ga will be given new subsidence and bending.

In order to avoid this, in the several-place construction method of this example, work is started by fitting the new pipe group 5G3 (see FIG. 5) to the old pipe group 4G3 at the lowest stage. When starting with the fitting work for the old pipe group 4G2 in the middle stage, it is a case where there is no problem even if the old pipe group 4G3 sinks or bends, such as when the old pipe group 4G3 is left alone. -For boat fishing, the old pipe group 4G in the bottom row will be replaced with the former pipe group 4G in the middle row after construction is completed.
2 will be constructed, and if necessary, the uppermost old pipe group 4G+ will be constructed.

As shown in FIG. 5, the new pipe group 5G has an inner diameter larger than the outer diameter of the old pipe 4 so that three adjacent old pipes 4 constituting the old pipe group 4G3 can be fitted simultaneously. It consists of a new pipe 5 with three adjacent steel pipes.

The plurality of new pipes 5 are arranged in parallel with each other and are integrated at a welding position 5m. If it is not necessary to replace all three pipes, a new pipe group 5G consisting of two new pipes 5 as shown in FIG. New pipe group 5G consisting of five new pipes 5 shown in
It may be set as s.

The workbench 7 shown in FIG. 1 is installed on the floor of the bit 18,
Its upper surface is a new pipe group 5G3 (fifth
(see figure) can be placed in a horizontal position.

In FIG. 4, the new pipe 5 in the center of the new pipe group 5G3
If the old pipe 4C corresponding to C has linearity, the impact type propulsion @9 is installed at the rear end of the new pipe 5C in the center, and the new pipe group 5
When inserting G, the old tube 4C functions as an insertion guide, and even if there is something other than the old tube 4C that has lost its linearity,
The three new pipes 5 after being buried are inserted in a desired straight posture.

As shown in FIG. 2, the impact type propulsion device 9 is connected to the rear part of each new tube 5 via a pressing head 6 that comes into contact with the rear end surface of the new tube 5C, and has an inclined portion at the tip inside the pressing head 6. 9a is fitted and held so as not to loosen even when the built-in striker moves. Further, an air hose 12 is connected to the rear of the impact propulsion device 9, and compressed air is supplied from a ground air conditioner blender 20 (see FIG. 1) that is a source of compressed air. Then, when compressed air is supplied,
The impact type propulsion device 9 pushes the new pipe 5 on the workbench 7 into the underground 3 by using the impact force generated by the reciprocating movement of a blower (not shown), and makes the old pipe 4 fit therein. Note that there is a support member 7a on the workbench 7.
is provided, and a removable jig (not shown) is mounted in front of it, so that the impact type propulsion device 9 generates propulsive force in a horizontal position. When the new tube group 503 is inserted and only the rear end remains in the pill-18, the impact propulsion device 9 and the pressing head 6 are removed and the next new tube 5D is inserted as shown in FIG. Connected to new pipe 5C. At this time, as shown in FIG. 9, the connecting member 5a is placed over the rear end of the new pipe 5C and the front end of the new pipe 5D and fixed by welding.

By the way, while installing the impact type propulsion device 9 on the new pipe 5C,
As shown in FIG. 4, pressing hydraulic jacks 9A may be attached to the rear ends of the two left and right new pipes 5 of the new pipe group 5G3 to assist the propulsion force.

It is also possible to use only a hydraulic jack without employing the impact type propulsion device 9. In addition, with or without using the impact propulsion device 9, the traction rod 22 and the pit 15 described in connection with FIG.
It is also possible to use a jack 13 installed at the

According to the mounting device 1 having such a configuration, several of the buried multi-filament pipes can be replaced at once in the following manner.

Prior to the installation work, all the old pipes 4 of the old pipe groups 4G, 4G3, which are grouped in the horizontal direction shown in FIG. 3, are inspected by an internal inspection device. Then, the old pipe 4 is selected which has no cracks and has high straightness with few bends in the vertical and horizontal directions. For example, if it is determined that the center old pipe 4C and the old pipe 4 on the left side of the old pipe group 4G3 at the bottom are linear, and all of the old pipe group 4G3 are to be fitted, three of the new pipes 5 A new tube group 5G3 with integrated books is placed on the front side of the upper surface of the workbench 7 (
(See Figure 4). And the new pipe 5C in the center of the new pipe group 5G3
A pressing head is attached to the rear end surface of the pressing head 6, and an impact type propulsion device 9 is inserted into the pressing head 6.

Compressed air is supplied from the air conditioner blender 20 (see Figure 1) to the impact type propulsion unit 9 via the air hose 12, and the pressing force accompanied by the impact force due to the movement of the impactor is applied to the new pipe group 5G3.
In addition, the new pipe group 5G3 will be buried underground. At this time, the new pipe 5, which has a larger diameter than the old pipe 4, moves forward while enclosing the old pipe 4° socket member 4b and the soil around it. The new pipe 5C in the center is along the highly linear old pipe 4C, and
The new pipe group 5G3 is laid straight even if either the left or right old pipes 4 are deformed.

When the rear end of the new pipe 5C approaches the front wall of the pit 1B, the burying operation is interrupted. The pressing head 6 and the impact propulsion device 9 are removed from the new pipe 5C, and as shown in FIG. 8, the next new pipe group 5G3 is connected to the rear of the new pipe group 5G. That is, the connecting members 5a (see FIG. 9) are welded to the corresponding front and rear new pipes, respectively. And the new pipe 5 in the center of the new pipe group 5G3
The pressing head 6 and the impact propulsion device 9 are attached to the rear part of D, and the burying of the new tube group 503 is resumed. The subsequent new pipe group 5G is fitted into the old pipe group 403 one after another.

As the burying continues, the first new pipe group 5G3 becomes bit 1.
Move forward to a position facing the 5th side. In this way, when the old pipe group 4Gz at the bottom is fitted with the new pipe group 5G, the first burial work is completed. Subsequently, the middle old pipe group 4G2 and the top old pipe group 4G are replaced with the new pipe group 5G2.5G.

In addition, a new pipe group 5Gs consisting of five new pipes 5 shown in FIG.
If it is possible to use this method, burial from the bottom to the top can be completed in - times. In that case, the workbench 7 is
A modified version that allows the new tube group 5Gs to be placed in the correct position is used.

After the construction is completed, the old pipes 4, soil, etc. inside each new pipe 5 buried underground 3 are taken out to the pinto 15 side and disposed of. Polycon FRP is installed in the new pipe 5 from this bin t-18.
An inner pipe (not shown) is inserted, and covered electric wires and various cables are passed through it.

Next, a number setting method in a different invention will be explained.

The mounting device 1 used for this purpose includes, as shown in FIG. 1O, a crushing head 2, a drawing rod 21 for connecting the new pipe 5 to the base 2a of the crushing head 2 shown in FIG. 11, and a wire lobe 19. and a retraction means 8 consisting of a backing plate 31;
It is composed of an impact type propulsion device 9 fitted to the crushing head 2. Further, a traction means 14 consisting of two hydraulic jacks 13, 13 (see FIG. 10), a traction rod 22, etc. for pulling the crushing head 2 and the new pipe 5 is also employed. In addition, each crushing head 2 is a crushing head group 2 integrated in advance at a welding position of 2 m, as shown in FIG.
It is formed in G.

The jack 13.13 mentioned above is installed in the pit 15 on the side where the crushing head 2, impact type propulsion device 9, etc. are pushed out, but it is used to reinforce the concrete surface and upper surface around the tip of the old pipe 4. While taking up the reaction force with the concrete wall 17, a traction force is generated to pull the new pipe group 5G into the position where the old pipe group 4G was, and finally the crushing throat 2 and impact type propulsion machine 9 are recovered. do.

A pit 18 on the side where a new pipe 5 such as a humid pipe or a steel pipe is inserted into the underground 3 has a crushing head group 2G on the floor surface and a new pipe 5.
．． A workbench 7 on which an impact type propulsion device 9 is placed is installed, and the traction iron 22 inserted into the highly linear old pipe 4 from the pit 15 side and the impact type propulsion device 9 are attached to the crushing head 2.

On the other hand, a plurality of old pipes 4 buried underground 3 are an old pipe group 4 G consisting of three horizontal old pipes 4, as in the case of Fig. 3.
,, 4 Grouped into G2.4 Off. Then, the old pipe 4 is crushed by the advance of the crushing head group 2G, and the new pipe group 5G is inserted into the old pipe site underground 3. In this case too,
As with the above construction method, the floor is replaced from the bottom. that time,
The old tube 4 with high straightness is used as an insertion guide, and in order to move forward following it, the crushing head 2 equipped with an impact type propulsion device 9 is faced, and the throat 2 for other crushing faces the adjacent old tube 4. be done. The new pipe 5 in this example may have a larger diameter than the old pipe 4, or may have the same or smaller diameter. can be used.

As shown in FIG. 11, a plurality (two in the figure) of wire lobes 19 are attached to the rear end surface of the base 2a of the crushing head 2 into which the impact type propulsion device 9 is fitted. 9 and is integrated with the mounting member 19a. A retraction rod 21 is attached to the attachment member 19a, and it is attached to the backing plate 3 attached to the rear end of the new pipe 5.
1 and is fixed with a nut 8a. In this way, the wire lobe 19, the retracting iron 21, and the backing plate 31
The drawing means 8 consisting of
As the crushing head 2 moves forward, it can smoothly insert the subsequent new pipe 5 into the underground 3 where the old pipe remains. At this time, as shown in FIG. 13, the conical surface of the distal end of the crushing head 2 advances while contacting the rear end of the old tube 4, crushing the old tube 4, and surrounding the inserted new tube 5. Fragments 4a are left underground 3.

In addition, since each new pipe 5 is firmly attached to each crushing head 2 via the drawing means 8, as shown in FIG. The three independent crushing heads 2 may be attached to each front end by the integration.

In the apparatus 1 having such a configuration, the following procedure is taken.

First, all the old pipes 4 in the grouped old pipe group 4 are
The old pipe 4 is inspected by an internal inspection device and has high linearity. For example, in the old pipe group 4G3 at the bottom,
If the old pipe 4C in the center of Figure 2 is judged to be linear, and if the entire old pipe group 4G3 is to be crushed, a crushing head group in which three crushing heads 2 are integrated is used. 2G,
Place it on the front side of the upper surface of the workbench 7.

On the other hand, as shown in FIG. 10, the concrete surface and upper surface of the bit 15 are reinforced with a concrete wall 17. Then, the traction rond 22 is inserted into the old pipe 4C while sequentially connecting with a joint or the like, and the traction rond 22 is extended until it reaches the other pinot 118. In the bit 18, the rear end of the traction arm 22 and the tip 2 of the conical part of the crushing head 2
b (see FIG. 12) are connected. Focus 18 on the conical surfaces of the three crushing heads 2 placed on the workbench 7.
Bring it into contact with the rear end of the old pipe group 4G3 facing to the side.

Next, the crushing head 2 located at the center of the crushing head group 2G
The impact type propulsion device 9 is fitted into the impact type propulsion device 9, and the air hose 12 is connected to the impact type propulsion device 9. Furthermore, each of the three new pipes 5 has a wire lobe 19 and a retraction rod 2 attached to each crushing head 2.
1.

On the other hand, at the focus 15, the tip of the traction iron 22 is
It is attached to the jacks 13, 13 via a traction fitting 23. As shown in FIG. 10, the jack 13 is extended while taking a reaction force with the concrete wall 17, and compressed air is supplied to the impact propulsion device 9 to generate an impact force. Due to the traction force of the traction means 14 acting together with the impact force, the three-piece crushing groove group 2G (see Fig. 12) with its conical surface in contact with the rear end of the old tube group 4G3 (see Fig. 12) moves the old tube group 4G3. Crush the
The new pipe 5 is smoothly inserted into the burial site of the old pipe group 4G3 while maintaining the desired attitude, leaving the fragment 4a of the old pipe 4 underground 3. By the way, the pulling force of the jack 13 is static, and the impact force from the impact propulsion device 9 is added, causing the old tube group 4G3 to break.

Crushing is promoted.

During this time, when the stroke of the jack 13 reaches its maximum, the jack 13 is reduced and the spacer 25 is inserted between the concrete wall 17 and the pressing fitting 24. Jyatsuki again 1
3 is extended and each time the maximum stroke is reached, the spacers 25 are increased one after another. Then, as shown in Figure 13,
When the new pipe 5 is added, the crushing head 2 is pulled out to the bit 15 side, and each tip of the first new pipe 5 advances to a position facing the bit 15, the burial work at the bottom stage is completed.

In addition, as shown in FIG. 7, when five new pipes 5 are buried using five crushing heads, the construction from the lowest stage to the highest stage can be completed in - times. After completion,
For example, a polycon FRP inner tube (not shown) is inserted into the new tube 5 extending from the focus 18 to the bit 15, and covered electric wires and cables are inserted therethrough.

By the way, in each of the above examples, we explained that the old pipe group 4G was to be buried in vertical groups, but the left,
It is also possible to divide them into sections such as middle and right, and insert them as a new pipe group or crushing head group that integrates the upper, middle, and lower sections.

In this case, old tubes in other groups are less likely to be affected by the group of new tubes being inserted.

[Brief explanation of drawings]

Fig. 1 is an overall vertical cross-sectional view of the buried multi-filament pipe in its state before the device construction method of the present invention is implemented, Fig. 2 is a positional relationship diagram between the old pipe group and the new pipe group, and Fig. 3 is the old pipe group. ■ in Figure 2 is an explanatory diagram of the array state of
-■ line arrow view, Figure 4 is a ■-IV line arrow view of Figure 1, Figure 5 is a v-v line arrow view of Figure 2, Figures 6 and 7 are of different arrangements. An explanatory diagram of the new pipe group, Fig. 8 is a vertical cross-sectional view of the state in which the equipment method is applied to the old pipe group at the lowest stage, Fig. 9 is an explanatory diagram of the connection state of the new pipe, and Fig. 10 is a diagram of a different invention. An overall vertical sectional view of the state before implementing the equipment construction method, Figure 11 is a positional relationship diagram of the old pipe group and new pipe group, and Figure 12 is the xn- of Figure 11.
y:, N-line arrow view, Figure 13 is an overall vertical cross-sectional view of the state in which the equipment construction method is being implemented, Figure 14 is an example of the constituent countries in place of Figure 12, and Figure 15 is a diagram of a conventional buried pipe. FIG. 16, a cross-sectional view of an example in which the equipment construction method is applied, is a diagram of an old pipe that has been deformed underground and is buried. 2.-Crushing head, 2G-Crushing head group, 3.-Underground,
4, 4C-old tube, 4G, 4G, ~4G3-old tube group, 5.
5C, 5I) - neotube, 5G, 5G, ~5G, -- neotube group.

Claims (3)

[Claims] (1) In the method of laying underground piping in which a new pipe is inserted into the buried position of the old pipe laid underground and the new pipe is replaced underground, multiple new pipes with a diameter larger than the old pipe are installed. A plurality of new pipes are placed in parallel with each other, and these new pipes are formed into a new pipe group in advance, and a plurality of adjacent old pipes among the old pipes buried in multiple rows are divided into groups into an old pipe group. On the other hand, the new pipe group is advanced while being inserted into the buried position of the old pipe group in accordance with the arrangement of each old pipe in the old pipe group, and each new pipe is fitted onto each old pipe. This is a method for replacing underground multi-line pipes. (2) In a buried pipe installation method in which a new pipe is inserted into the buried position of the old pipe laid underground and the new pipe is re-laid underground, the crushing head moves forward while crushing the old pipe. are arranged in parallel, and the multiple crushing heads are formed into an integrated crushing head group in advance. Then, according to the arrangement of each old pipe in the old pipe group, the group of crushing heads is advanced to the buried position of the old pipe group, and each old pipe is towed by the group of crushing heads to the old pipe site where the old pipes were crushed by the crushing head. A method for replacing buried multi-line pipes characterized by inserting new pipes. (3) In claim 2, instead of integrating the crushing head in advance, a plurality of new pipes are arranged in parallel with each other, and the plurality of new pipes are formed into a group of new pipes that are integrated in advance. Then, a crushing head is attached to the front part of the old pipe group, which is a group of old pipes that are buried in multiple rows, in accordance with the arrangement of each old pipe in the old pipe group. The new pipe group is advanced to the burial position of the old pipe group, and the new pipe group pulled by the crushing head is inserted into the old pipe trace where each old pipe was crushed by the crushing head. A method for replacing buried multi-line pipes.