JPH0432192B2 - - 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 methods, such as underground 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 at best be applied to the expander publication. This is because the winch has a limited traction power, and the impact 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 the first to 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. In that case, it will be necessary to use an impact-type propulsion device to drag the new tube forward, and it is desirable to develop a traction structure for this purpose. In this case, it is necessary to be able to advance the new pipe such as the Huyum pipe without damaging it, and also to ensure good workability so that the new pipe can be reliably and smoothly integrated into the impact type propulsion machine after the work to add the new pipe. This is required. and,
A structure is desired in which the members for towing the new pipe do not protrude into the ground, and the forward movement during towing by hydraulic jacks is not obstructed.

The present invention was made in view of the above-mentioned needs, and its purpose is to be able to advance a new pipe without damaging it during burying work, and to ensure smooth movement of the impact type propulsion machine and the new pipe. An object of the present invention is to provide a buried pipe replacement construction device that improves the workability of adding new pipes and realizes simpler and faster operation.

[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 has an approximately conical crushing head 4 with a diameter larger than that of the new impact type propulsion unit 3 attached to the tip of the new impact type propulsion unit 3, and a traction member 3 that is inserted into the existing pipe 6.
Hydraulic jack 2 for advancing the impact crushing body 1 at 0
This is a buried pipe replacement construction device which crushes an existing pipe 6 with the impact crushing body 1 and buries a new pipe 7 inside another. At the rear of the impact crushing body 1, a pushing member 9 for advancing the new pipe 7 via the connecting member 8 is provided.
A connecting member 8 runs longitudinally through the new pipe 7, and its front part is attached to the crushing head 4, while its rear part is detachably attached to the pushing member 9.

[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 new pipe 7 includes the impact crushing body 1 and the pushing member 9 behind it.
The connecting member 8 connects and fixes them so that they do not separate. As a result, the new pipe 7 always moves forward accompanying the impact crushing body 1. At that time, the connecting member 8 is inside the new pipe 7 and does not protrude into the ground, so its forward movement is not hindered. The new pipe 7 is advanced by the pushing member 9 in the space after the impact crushing body 1 has crushed the existing pipe 6, and there is no large frictional resistance acting on the new pipe 7 during the forward movement, and the hydraulic jack The powerful force of 2 does not directly affect the new tube 7.

〔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. By pulling the pushing member located at the rear of the impact crushing body by the connecting member within the new pipe, the new pipe 7 is reliably advanced and smooth advancement is maintained without any protrusions. Furthermore, since the new pipe 7 moves through the space after the existing pipe has been crushed, there is less frictional resistance and the capacity of the hydraulic jack is also small.

〔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 approximately conical in diameter and has a larger diameter than the propulsion device 3 and is attached to the tip of the impact type propulsion device 3. Being rushed into.
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. There is a reserve. Furthermore, prior to connecting the steel rod 14, as shown in FIG. 4, the preceding new pipe 7A to be added and the new connecting 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 drilled therein, and a support ring portion 21 is formed in 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 at the tapered surfaces 24 and 25 where they come into contact. 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, the body of the impact type propulsion device 3 is supported at the rear of the guide tube 20 mentioned above. A partition wall 26 is 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 across a 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 direction of the steel rod 14 is at least the width of the pits 5 and 19 formed on the road side.
When it is shorter than W1 and W2, the connection and removal 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.

As shown in FIG. 1, the above-mentioned flexible connection part 13 is a connection member in which a wire rope 33 is crossed, and when the traction member 30 is composed of only the steel rod 14, the connection with the impact crushing body 1 is 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.

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 jackstone 41 and a retracting jackstone 42 on a base 40 installed at the bottom of the pit 19, as shown in FIGS. 6a and 6b. 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.

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 propulsion machine 3 that has been plunged into the pit 5 is transmitted to the crushing head 4, and the impact crushing body 1 impacts the existing pipe 6, such as an old ceramic pipe. 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 to a position one stroke forward of the hydraulic jack 2 (see FIGS. 6a and 6b). The hydraulic jack 2 is reduced, and the retracting jackstone 42 is advanced by one stroke. Therefore, a spacer (not shown) is interposed between the pulling back shaft 42 and a steel stopper plate 46 attached to the concrete wall 45 of the tunnel entrance. Such operations are repeated to stack a large number of spacers, and to displace them by a distance approximately equal to the length of the steel rod 14. When the connecting steel rod is pulled out into the pit 19 enough to remove one steel rod 14, the connecting tool 15
A (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. Remove the spacer, move the retracting shaft 41, hydraulic jack 2, and retracting shaft 42 back to their original positions, and then tighten the subsequent steel rod 14N into the nut 4.
3, it can be fixed to the retracting shaft 41. The steel rod 14 has little cross-sectional deformation, and the connection and fixing operation thereof is extremely simple and easy. Removed steel rod 1
4 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. 7th
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 fitting 7B, pass the pushing member 9 through the steel rod 14B, apply it to the rear of the new pipe 7B, and fix it with the nut 11. In this way, by operating the impact propulsion device 3 again and expanding and contracting the hydraulic jack 2, the existing pipe 6 at the front 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 won'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, the new pipe 7 is supported by the impact crushing body 1 and the pushing member 9 behind it, and these are connected and fixed together by the connecting member 8. The new pipe 7 always moves forward accompanying the impact crushing body 1. Connecting member 8 is new pipe 7
Since it is located within the ground and does not protrude underground, progress is not obstructed. The new pipe 7 is advanced by the pushing member 9 in the space after the impact crushing body 1 has crushed the existing pipe 6, and there is no large frictional resistance acting on the new pipe 7 during the forward movement, and the hydraulic jack The capacity of the tube 7 is also small, and there is no need for a huge force to be applied directly to the new tube 7.

[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, Figures 6a and b are plan layouts of the hydraulic jack and steel rod fixture in the pit, Figure 7 is a state diagram in which the next new pipe is connected after the first new pipe that has been buried. 1... Impact crushing body, 2... Hydraulic jack, 3...
...Impact propulsion device, 4...Crushing head, 6...Existing pipe, 7, 7A, 7B...New pipe, 8...Connection member,
9... Pushing member, 30... Traction member.

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 for advancing, and buries a new pipe underground while crushing an existing pipe with the impact crushing body, and a connecting member is connected to the rear of the impact crushing body. A pushing member for advancing the new pipe is provided, and the connecting member passes longitudinally through the new pipe, and its front part is attached to the crushing head, while its rear part is removably attached to the pushing member. A buried pipe replacement construction device characterized by: