JPH0430518B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a buried pipe replacement construction device, and more specifically, the present invention relates to a buried pipe replacement construction device, and more specifically, while crushing an existing pipe buried underground using an impact type propulsion machine, This invention relates to a device that can bury new pipes. This is particularly used in the field of small-diameter propulsion construction methods, such as underground pipe construction.

[Prior art]

The safe and economical small-diameter propulsion method is used for underground pipe work such as promoting the undergrounding of cables and water supply and sewage development projects. In this case, an impact-type propulsion device is used in which a blower is reciprocated within the main body using compressed air, giving intermittent impacts to the main body, and the resulting force propels the product underground. This is, for example,
It has a bullet shape as described in Japanese Patent No. 46-16645, and penetrates through a hole with a large outer diameter in the main body.
Construction methods using such an impact type propulsion machine include the expander construction method (for example, Japanese Patent Publication No. 1983-9924), which attaches a mantle that covers the main body and expands the through-hole diameter, and the direct piping method by pushing the buried pipe. There are ramming methods for construction and pooling methods for towing buried pipes.

By the way, there are cases where there is an existing underground pipe, and due to aging, it is necessary to install a new underground pipe. In particular, if a new pipe must be installed in the same location as an existing pipe, it is necessary to remove the existing pipe. In that case, it is often not easy to take out the existing pipe, but if you shred it and push the pieces so that they are scattered in the ground around the new pipe, you can bury the new pipe at the same time without removing the existing pipe. I can do it. This idea has recently been attracting attention, but it is not possible to generate enough forward force to crush existing pipes and bury new pipes by simply using the above-mentioned impact type propulsion machine. Therefore, supplementary measures are required.

In the above-mentioned underground pipe replacement work, the space of the existing pipe can be used. In other words, a winch is placed in the pit on the reaching side of the impact propulsion machine,
A wire rope connected to the tip of the impact type propulsion device may be inserted into the existing pipe, and the wire rope may be pulled by a winch. Since the winch can wind up long wire ropes, it has the advantage of not requiring a large pit. An example of pulling such a rope with a winch is described in Japanese Patent Publication No. 50-2524, but it can only be applied to the expander construction method at most. This is because the winch's traction power is limited, and the impact-type propulsion machine cannot exert enough force to push the fragments of the existing pipe into the ground and pull in the new pipe. On the other hand, there is a hydraulic jack that exerts greater force than a winch. An example of using this to push a buried pipe underground is published in Japanese Patent Application Laid-Open No. 60-37398.
It is stated in the No. If a hydraulic jack is used, a large forward force can be obtained, so there is no need to use an impact propulsion device. In this case, the new pipe to be buried will be placed first and move forward, increasing the probability that the new pipe will be damaged during construction.

[Problem that the invention seeks to solve]

Therefore, if the existing pipe is crushed by the impact force of the impact type propulsion machine, and the impact type propulsion machine is pulled by the powerful force of the hydraulic jack, it is thought that the replacement work of the buried pipe can proceed smoothly. However, a hydraulic jack cannot wind up a long wire rope, and it is necessary to re-grasp the wire rope every time the jack strokes, and in this case, it is not easy to grip the wire rope in a manner that can withstand a strong traction force. Furthermore, the rope fastening work performed for each stroke has the problem of prolonging the interruption of the burying work.

The present invention has been made in order to solve the above-mentioned problems, and its purpose is to realize the adoption of a traction member that can be easily connected to a hydraulic jack, and to solve the above-mentioned problems that occur when using a wire rope. on the other hand,
The unique problems that arise when using a highly rigid traction member, namely, the traction member can be installed and removed even in narrow pits, breakage at the connection point between the traction member and the impact propulsion machine can be eliminated, and existing pipes can be To provide a buried pipe replacement construction device capable of quickly constructing a new pipe at the same location while crushing the pipe.

[Means for solving problems]

The features of the buried pipe replacement construction apparatus of the present invention will be described below with reference to FIGS. 1 and 2.

An impact crushing body 1 having a substantially conical crushing head 4 with a diameter larger than that of the propulsion device attached to the tip of the impact type propulsion device 3, and a traction member 30 inserted into the existing pipe 6.
a hydraulic jack 2 for advancing the impact crushing body 1;
This is a buried pipe replacement construction device which buries a new pipe 7 underground while crushing the existing pipe 6 with the impact crushing body 1. The traction member 30 is composed of a plurality of steel rods 14 connected by a connecting tool 15 and a flexible connecting member 31 connected to the rear end, and the front part of the connected steel rod 14 is hydraulically connected. The flexible connecting member 31 is connected to the jack 2, and the rear end of the flexible connecting member 31 is connected to the impact crushing body 1.

[Effect]

A crushing head 4 is attached to the tip of the impact type propulsion device 3, and the impact force of the impact type propulsion device 3 is transmitted to the crushing head 4, which crushes the existing pipe 6. On the other hand, the impact crushing body 1 includes a traction member 30 made of connected steel rods 14 inserted through the existing pipe 6.
The impact crushing body 1 buries the new pipe 7 while pushing away the fragments of the existing pipe 6 into the ground.

The traction member 30 is a connected steel rod 14, and the steel rod 1 is pulled out into a pit 19 by a hydraulic jack 2.
By disconnecting 4, the steel rod 14 can be removed even in a narrow pit. The steel rod 14 has high rigidity, making it easy to connect subsequent steel rods to the hydraulic jack 2.
On the other hand, the connected steel rod 14 and the impact crushing body 1 are connected via a flexible connecting material 31, so that even if the impact crushing body 1 tilts while moving forward, the flexible connecting material 31 absorbs the There is no immediate bending action on the rod 14, and no damage occurs if the steel rod 14 breaks.

〔Effect of the invention〕

In the present invention, the impact crushing body is composed of an impact type propulsion device and a crushing head attached to the tip of the impact type propulsion device, and since the impact crushing body is towed by a hydraulic jack, it has a diameter larger than the impact type propulsion device. The existing pipe is crushed by the crushing head, the impact crushing body is advanced by the powerful force of the hydraulic jack, and the new pipe can be buried at the location of the existing pipe. Since the impact crushing body is towed by a connected body of steel rods, the steel rods pulled out using hydraulic jacks can be removed, and there is no need for a large pit for this purpose, making it possible to work in places with limited construction space. It becomes possible. Also, connecting the subsequent steel rod to the hydraulic jack is extremely easy and simple compared to connecting a wire rope, and the work time for this can be shortened. Furthermore, since a flexible connecting material is used for connection on the impact crushing body side, even if the impact crushing body tilts as it moves forward, no bending force is applied directly to the steel rod, and the steel rod can be connected directly to the impact crushing body. It is possible to avoid the breakage accident that would occur if the connection were made. A portion of the impact force generated in the impact crushing body is absorbed by the flexible connecting member, and vibrations transmitted to the hydraulic jack are also reduced.

〔Example〕

Hereinafter, the present invention will be explained in detail based on examples thereof. FIG. 2 is an overall construction drawing of the buried pipe replacement work to which the present invention is applied, and the construction equipment is mainly composed of an impact crushing body 1 and a hydraulic jack 2 for towing it. The impact crushing body 1 consists of an impact type propulsion device 3 and a crushing head 4 that is attached to the tip of the impact type propulsion device and has a substantially conical shape and has a larger diameter than the propulsion device 3. be done. The impact type propulsion device 3 has an impactor within its main body, and the impactor moves back and forth when compressed air is supplied from the rear, transmitting the impact to the main body.
The shape of the crushing head 4 is suitable for crushing an existing pipe 6 such as a ceramic pipe, and it is sufficient that the diameter is equal to or larger than that of a new pipe 7 such as a hume pipe to be replaced.

As shown in FIG. 1, such an impact crushing body 1 includes a pushing member 9 that advances the new pipe 7 via a connecting member 8. The connecting member 8 passes through the new pipe 7 vertically, and its front part is attached so that it is hung around the two pins 10 of the crushing head 4, while the rear part is attached to the center of the pushing member 9 with a nut. 1
1 can be removably installed. That is, since the connecting member 8 consisting of the wire rope 12, the connecting member 13, and the steel rod 14 does not come out from the outer periphery of the new pipe 7, it does not obstruct the forward movement of the impact crushing body 1, and the connecting member 8 is easily removed. It will not cause any damage. Locking devices such as pins 10 attaching the wire rope 12 to the crushing head 4 are arranged radially of the crushing head 4, with their tips brought as close as possible to the outer surface of the percussion propulsion device 3. Thereby, the wire rope 12 is prevented from coming off the pin 10, and the locked state of the connecting member 8 can be stabilized.

The reason why the wire rope 12 is employed as the connecting member 8 is that a tensile force can be applied to the impact type propulsion device 3 regardless of its shape. The reason why the steel rod 14 is attached to the pushing member 9 is that when adding a new pipe 7, the steel rods 14A and 14B can be easily connected using a connecting tool 15 such as a screw coupling as shown in FIG. It's for a reason. In addition, prior to connecting the steel rod 14, as shown in FIG. 4, the preceding new pipe 7A and the subsequent new pipe 7
B takes place with a connecting ring 18 with O-rings 16,17. A steel rod 14B that newly constitutes the rear portion of the connecting member 8 is attached to a pit 19, which will be described later.
(See Figure 2).
1 is attached to the pushing member 9. Note that the steel rod 14 is an inexpensive rolled steel rod or the like having threaded ribs formed over its entire length.

By the way, the new pipe 7 moves forward while being pushed by the pushing member 9 which is pulled by the connecting member 8.
In order to stably maintain the installation posture of the new tube 7, a guide tube 20 shown in FIG. 1 is installed at the rear of the crushing head 4.
is provided in a protruding manner, and a support ring portion 21 is formed on the pushing member 9 . A new pipe 7 is fitted over them, and a buffer material 22 is interposed between the crushing head 4 and the new pipe 7 to prevent the new pipe 7 from being damaged by the vibrations of the impact propulsion machine 3. There is. In order to prevent the cushioning material 22 from being lost to the ground or being worn out in a short period of time, a groove for the connecting ring 18 (see Figure 4) formed at the tip of the new pipe 7 is fitted. It is covered with a collar 23. On the other hand, the impact propulsion device 3 and the crushing head 4 are only fitted together at the tapered surfaces 24 and 25 where they connect. Therefore, vibration of the impact type propulsion device 3 may cause the relative posture with the crushing head 4 to collapse, and in order to prevent this, a bulkhead supporting the body of the impact type propulsion device 3 is installed at the rear of the guide tube 20 mentioned above. 26 are provided.
As shown in FIG. 5, this has a round hole 27 with the same diameter as the impact type propulsion device 3, and cutouts 28 are formed at the top and bottom of the hole to allow the wire rope 12 described above to pass through. .

The above-mentioned hydraulic jack 2 exerts a strong traction force to move the impact crushing body 1 forward.
As shown in the figure, it is installed, for example, in a pit 19 formed on the other side of the road 29. Then, the impact crushing body 1 is advanced by the traction member 30 inserted through the existing pipe 6, and the new pipe 7 is buried underground while the fragments of the existing pipe 6 crushed by the impact crushing body 1 are removed underground. .

By the way, the above-mentioned traction member 30 includes a plurality of steel rods 14 connected by the same connector 15 as described above, and a flexible connecting member 31 connected to the rear end.
It consists of The front portion of the connected steel rod 14 is connected to the hydraulic jack 2 via a steel rod fixture 32, and the rear portion of the flexible connecting member 31 is connected to the impact crushing body 1. The length dimension of the steel rod 14 is at least the width W of the pits 5 and 19 formed on the road side.
When the length is shorter than 1.W2, the connection and installation work of the steel rod 14 becomes easy. Conversely, if the steel rods 14 are made short, it is possible to connect the steel rods 14 even if the pit width is not sufficient, and therefore the connected steel rods 14 can be used reliably and strongly. Towing becomes possible. By the way, if the length is approximately the same as the new pipe 7, when the new pipe 7 moves forward by one length, the steel rod 14
can be removed. Therefore, the steel rod 14 can be removed using the interruption time during the work of adding new pipes 7 in the pit 5, and the interruption of the burying work can be shortened.

As shown in FIG. 1, the above-mentioned flexible connecting portion 31 is a connecting member in which a wire rope 33 is crossed, and when the traction member 30 is composed of only the steel rod 14, it is connected to the impact crushing body 1. It is possible to avoid breakage that is likely to occur in the hydraulic jack 2 and to reduce the transmission of vibration to the hydraulic jack 2. The flexible connecting member 31 includes a connecting tool 34 and a locking tool 35, of which the locking tool 35 is fitted into a cylindrical space 36 inside the tip of the crushing head 4 constituting the impact crushing body 1, and is reduced in diameter. It has a connecting structure that is locked at the stepped part so that it does not come off. The wire rope 33 is fixed to the locking device 35 as shown in FIGS. 6a and 6b. First, the rear part of the wire rope 33 is drawn into the crushing head 4 in advance, and then inserted into the hole in the cylinder body 37. The pin 38 is inserted in the radial direction of the cylindrical body 37, and in this state, the wire rope 33 is pulled forward to move the cylindrical body 37 along the cylindrical space 36 to the stepped portion. The pin 38 is restrained by the wall of the cylindrical space 36, and the wire rope 33 will not come off. Note that the connection between the flexible connecting member 31 and the impact crushing body 1 is not limited to the crushing head 4, and may be connected by providing a metal fitting on the front part of the impact type propulsion device 3, although not shown.

A steel rod fixture 32 is employed at the location where the steel rod 14 connected as described above is connected to the hydraulic jack 2. This type of hydraulic jack 2, such as a hydraulic cylinder, is installed between a retracting shaft 41 and a retracting shaft 42 on a base 40 installed at the bottom of the pit 19, as shown in FIGS. 7a and 7b. It is attached. The steel rod fixture 32 is mainly composed of a retracting shaft 41 and a nut 43 that is threaded onto the steel rod 14 that protrudes through the retracting shaft. In addition, the nut 4 in front of the retracting shaft 42
4 comes into contact with the joystone 42 when it is pulled back by the hydraulic jack 2, and prevents the hydraulic jack 2 from excessively contracting.

Next, the operation of crushing the existing pipe 6 and burying the new pipe 7 will be explained using the configuration described above. The impact force generated by the impact type propulsion machine 3 plunged into the ground from the pit 5 is transmitted to the crushing head 4, and the impact crushing body 1 impacts the existing pipe 6, causing the existing pipe 6, such as an old ceramic pipe, to is crushed. The impact crushing body 1 is the existing pipe 6 in front
It is towed by the large force of the hydraulic jack 2 via a traction member 30 consisting of a plurality of connected steel rods 14 inserted therein. The impact crushing body 1 displaces the fragments of the existing pipe 6 into the ground while crushing the new pipe 7.
bury it. That is, the new pipe 7 is pushed forward by the pushing member 9 pulled by the connecting member 8, and moves forward together with the impact crushing body 1.

New pipe 7 in pit 5 is 1 of hydraulic jack 2
When the stroke reaches the bottom, the extension operation of the hydraulic jack 2 is stopped. The retracting shaft 41, which is the steel rod fixture 32 in the pit 19, moves from the initial position as shown in FIG. 7a to the position advanced by one stroke L of the hydraulic jack 2 as shown in FIG. 8a. Immediately turn on the hydraulic jack 2 as shown in figure b.
is reduced, and the retracting shaft 42 is advanced by one stroke L. Therefore, a spacer 4 is installed between the pulling back shaft 42 and a steel stopper plate 46 attached to the concrete wall 45 of the mine entrance, as shown in c and d of the same figure.
7 is interposed. By repeating this operation, a large number of spacers 47 are stacked as shown in FIG.
The steel rod 14 is displaced by a distance approximately equal to its length. When the connecting steel rod is pulled out into the pit 19 enough to remove one steel rod 14, the connecting tool 15A
(see FIG. 2) and remove the front end steel rod 14M from the steel rod fixture 32. Such work can be carried out without any problems even in the narrow pit 19. After removing the spacer 47, the retractable joint 41,
The hydraulic jack 2 and the retracting shaft 42 may be retreated to their original positions, and the subsequent steel rod 14N may be fixed to the retracting shaft 41 with the nut 43.
The steel rod 14 has little cross-sectional deformation, and the connection and fixing operation thereof is extremely simple and easy. The removed steel rod 14 is carried to the pit 5 and used for connecting the next new pipe 7.

In Pit 5, the new pipe 7A has been advanced underground.
After that, the next new pipe 7B is connected. First, the nut 11 is removed and the pushing member 9 is removed. 9th
As shown in the figure, a steel rod 14 in the rear part of the connecting member 8
The steel rod 14B, which has already been brought in from the pit 19, is connected to A using the connector 15. Preceding new pipe 7
Fit the connecting ring 18 to A, add the new pipe 7B, pass the pushing member 9 through the steel rod 14B, apply it to the rear of the new pipe 7B, and fix with the nut 11. In this way, by operating the impact type propulsion device 3 again and expanding and contracting the hydraulic jack 2, all the existing pipes 6 can be moved to the new pipe 7.
can be exchanged with.

In such an operation, even if the crushing head 4 of the impact crushing body 1 is tilted while moving forward, the connected steel rod 1
4 and the impact crushing body 1 are connected through a flexible connecting member 31, so that the steel rod 14 constituting the traction member 30 is not immediately bent, and there is no possibility that the steel rod 14 will break. It doesn't happen. In addition, a part of the impact force generated in the impact crushing body 1 is absorbed by the flexible connecting member 31, and vibrations transmitted to the hydraulic jack 2 can be reduced.

Since the impact crushing body 1 is pulled by a plurality of connected steel rods 14, the steel rods 14 pulled out to the pit 19 can be removed one by one.
Therefore, a wide pit is not required. Of course, the pit 5 for connecting the steel rods can also be narrow. The subsequent steel rod 14 in the pit 19 is moved by the hydraulic jack 2.
Both the work of connecting the steel rods 14 in the pit 5 and the work of connecting the steel rods 14 in the pit 5 can be completed in a short time.

Furthermore, when moving the new pipe 7 forward, since the connecting member 8 does not protrude into the ground outside the new pipe 7 that the impact crushing body 1 is pulling, the traction of the impact crushing body 1 is not hindered. . Furthermore, by transporting the steel rods 14 collected in the pit 19 to the pit 5, compatible steel rods 14 can be used one after another to connect the new pipe 7. As a result, it is sufficient to prepare the steel rods 14 in a number corresponding to the length of the construction section, and it is also possible to prevent the waste of materials that would occur if a large number of steel rods were prepared.

[Brief explanation of drawings]

Fig. 1 is a sectional view of essential parts of an embodiment of the buried pipe replacement construction device of the present invention, Fig. 2 is an explanatory diagram of the buried pipe replacement work, Fig. 3 is a sectional view of the state in which steel bars are connected by a connecting tool, Figure 4 is a cross-sectional view of the new pipe connected by the connecting ring, Figure 5 is a cross-sectional view taken along the - arrow in Figure 1, and Figures 6 a and b are explanatory diagrams of how to fix the wire rope constituting the flexible connecting material. , FIGS. 7a and 7b are plan and front layout views of the hydraulic jack and steel rod fixture in the pit, and FIGS. 8a to 8e are explanatory diagrams of the expansion and contraction operation of the hydraulic jack and the corresponding displacement operation of the steel bar fixture, FIG. 9 is a diagram showing the state in which the next new pipe is added after the first new pipe that has been buried. 1... Impact crushing body, 2... Hydraulic jack, 3...
...Impact propulsion machine, 4...Crushing head, 6...Existing pipe, 7,7A,7B...New pipe, 14,14A,1
4B, 14M, 14N... Steel rod, 15... Connection tool, 30... Traction member, 31... Flexible connection material.

Claims (1)

[Scope of Claims] 1. An impact crushing body having an approximately conical crushing head with a diameter larger than that of the propulsion machine attached to the tip of an impact type propulsion machine, and a traction member inserted into an existing pipe to crush the impact crushing body. A buried pipe replacement construction device is equipped with a hydraulic jack that moves forward, and buries a new pipe underground while crushing the existing pipe with its impact crushing body, wherein the towing member has a plurality of pipes connected by a connecting device. It is composed of a steel rod and a flexible connecting member connected to its rear end, the front part of the connected steel rod is connected to the hydraulic jack, and the flexible connecting member has a rear end thereof connected to the hydraulic jack. A buried pipe replacement construction device, characterized in that it is connected to the impact crushing body.