JPH0529759B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a replacement device for water pipes etc. buried underground.

(Prior art) When replacing a water pipe etc. buried underground with a new one of the same diameter or a slightly larger diameter one, excavate the ground surface along the underground water pipe etc. and remove the existing pipe. This was done by removing old water pipes, replacing them with new ones, and then backfilling them.

(Problem to be solved by the invention) However, when replacing water pipes etc. buried under a road, it is necessary to cut off a part of the road to traffic, and it is difficult to replace a water pipe buried under a road. In some cases there are problems. Particularly in the case of replacement work at intersections, it was difficult to control traffic and the work could not be carried out as planned. In addition, the surface pavement was destroyed for replacement work.
After the construction was completed, the area had to be backfilled and re-paved, and this incidental work also required considerable construction costs.

The present invention was made in view of the current situation, and an object of the present invention is to provide a device that can replace water pipes and the like without excavating the ground surface.

(Means for Solving the Problems) When the apparatus for replacing water pipes, etc. according to the present invention moves forward, it is guided along the existing pipes by a guide mechanism placed in front, and the back muscles of the existing pipes are removed from the outer diameter side by the breaking mechanism. At the same time as it expands and destroys
In a replacement device for water pipes, etc., configured to press and supply a new pipe from behind to the part that has been expanded and destroyed by a supply device to replace old and new pipes, the destruction mechanism A plurality of protruding members are provided around the existing piping so that they can protrude freely in the radial direction of the existing piping, and are equipped with a protruding mechanism that makes the existing piping evenly protrude. The guide mechanism is provided with guide means such as rollers around the periphery to guide the center of the destruction mechanism to be located at the center of the existing piping, and the guide mechanism is provided near the rear of the destruction mechanism to prevent collapse. The cover is disposed, and the outer diameter of the tip thereof is equal to or smaller than the inner diameter of the rear end of the destruction mechanism, and the cover has a tapered portion whose diameter increases at the rear end side.

(Function) Therefore, the water pipe exchange device having the above-mentioned structure functions as follows.

In other words, by placing the supply device behind the existing piping,
When the main body of the device is pushed forward through the new piping with this supply device, the main body of the device is guided by the existing piping by the guide mechanism, and the center (axis center) of the existing piping coincides with the center of this destruction mechanism. As the device moves forward, the existing pipes that have not been destroyed are evenly protruded in the radial direction of the pipe by the action of the projecting mechanism, and the plurality of projecting members installed around the circumference of the diameter expansion and destruction mechanism of the main body of the device protrude evenly from the inner diameter. Press evenly toward the outer diameter side to destroy the tube so that the fracture surface is located approximately concentrically from the center of the tube, and at the same time harden the surrounding wall surface. A collapse prevention cover is located close to the rear of the diameter expansion and destruction mechanism to prevent the destroyed existing piping from sinking into the inner diameter side, and a guide mechanism in front of the diameter expansion and destruction mechanism. In combination with this, the diameter expansion destruction mechanism is always maintained in a state where its center coincides with the center of the existing piping, and the destruction mechanism is advanced.
New piping is supplied (inserted) into this destroyed area with the center of the existing piping aligned.
be done. By repeating these operations, the existing piping is replaced with new piping.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a side sectional view of a water pipe replacement site showing the overall configuration of the replacement device according to the present invention, FIG. 2 is a side sectional view showing the detailed structure of the main body of the device in FIG. 1, and FIG. is a cross-sectional view taken along line XX in FIG. 2, and FIG. 4 is a cross-sectional view taken along line Y-Y in the same figure. Figure 1 is a side sectional view of the replacement site where the existing piping has been partially replaced with new piping.
2 shows the main body of the device, 2 shows the traction device, 3 shows the supply device, 4 shows the existing piping, 5 shows the new pipes, and 6 and 7 show the vertical piles excavated for construction work. A traction device 2 is arranged on a vertical pile 6 excavated in front of the existing pipe, and inside the existing pipe 4 there is a guide mechanism 1A of the device main body 1, a front part of the frame 1F, a diameter expansion breaking mechanism 1B etc. are inserted, and the wire 2W of the above-mentioned traction device is connected to the front end of this frame 1F. At the rear of the destruction mechanism 1B, a collapse prevention cover 1C (see Fig. 2), which is a cylindrical body with a tapered part at its tip that constricts in diameter at the front end and expands in diameter at the rear end, also constitutes the main body of the device. ), and a connecting fitting 1D for connecting a new pipe is attached to the rear of the collapse prevention cover 1C, that is, to the rear end of the frame 1F. The rear end of the new pipe 5 is placed on the roller of the placing mechanism 3A of the supply device 3,
It is configured to be pressed and supplied in a forward direction from the rear end by the pressing mechanism 3B of the supply device 3 in a timed manner as the device main body 1 advances.

The detailed structure of the device main body 1 will be explained based on FIG. 2. As mentioned above, the connecting fitting 1E for connecting the wire 2W of the traction device is attached to the tip of the cylindrical pipe forming the frame 1F. It is worn. Further, the guide mechanism 1A is composed of a plurality of supporting metal fittings 1b arranged around the frame 1F and a roller 1c attached to the distal end of the supporting metal fittings 1b (see FIG. 3). In the case of the present invention, the diameter expansion/destruction mechanism 1B includes a plurality of projecting metal fittings 1 that are supported so as to be freely projectable in the radial direction.
d, a steel chisel 1e that is attached to the protruding fittings 1d to abut and destroy the existing piping, and a protruding mechanism consisting of a slider 1f and a link 1g for making the plurality of protruding fittings 1d protrude evenly. , and a plurality of hydraulic cylinders 1h that drive this ejection mechanism. The slider 1f is a hydraulic cylinder 1h.
The projecting movement causes the frame 1F to slide on the outer wall surface toward the hydraulic cylinder 1h, and this sliding movement causes the plurality of projecting metal fittings 1d that are circumferentially provided via the links 1g to evenly project toward the outer diameter side. (See Figure 4).

A collapsing prevention cover 1C, which is a cylindrical body whose diameter is reduced on the side of the protruding metal fitting 1d, is disposed adjacent to the rear of the protruding metal fitting 1d of the diameter expanding and breaking mechanism 1B. The outer diameter of the protruding metal fitting 1d side of this collapse prevention cover (the tip of the collapse prevention cover) is the protruding metal fitting 1 of the diameter expansion destruction mechanism.
It is formed so that d is approximately equal to or smaller than the distance (outer diameter) d (see FIG. 4) between the diagonally opposite protruding metal fittings 1d when they are retracted.

A connecting fitting 1D is attached to the rear end surface of this collapse prevention cover 1C toward the rear, and a connecting fitting 5A of the new pipe 5 located at the tip can be connected to this connecting fitting 1D. Metal fittings 1
D and 5A constitute a universal joint mechanism.

Next, the supply device 3 will be explained based on FIG. 5. The supply device 3 includes a mounting mechanism 3A for mounting a new pipe, and a pressing mechanism 3B located at the rear of this mounting mechanism 3A to press and supply the pipe placed on this mounting mechanism 3A forward. Become. The above-described placement mechanism 3A includes a support frame 3a and rollers 3b disposed around the frame 3a. Of these rollers 3b, the rollers disposed on both sides of the upper part are attached to the frame 3a via rotatable support arms 3a' so as not to obstruct the placing of the pipe from above. (See Figure 6).
The pressing mechanism 3B includes a hydraulic cylinder 3c, a base portion 3d that fixes the cylinder side of the hydraulic cylinder 3c, and a pressing plate 3e that is attached to the tip of the rod side of the hydraulic cylinder 3c and presses the rear end of the piping. It becomes more. The total length of the mounting mechanism 3A is longer than the length of one pipe. In addition, when pushing the new pipe 5 by the pushing mechanism 3B, after extending the stroke of the pushing mechanism, re-fixing the base portion 3d forward is repeated as many times as necessary to push the stroke equal to the length of one pipe. proceed.

The traction device uses a commonly used winch and steel wire.

Thus, the replacement device configured in this manner operates as follows during replacement work.

First, the wire 2W of the traction device 2 is passed through the existing piping from the front to the rear, and the tip of the wire 2W is connected to the connecting fitting 1E of the device main body 1. and,
With the protruding metal fitting 1d of the diameter expansion/destruction mechanism 1B in a retracted state, the device main body 1 is inserted to the extent that a part (tip end) of the collapse prevention cover 1C enters the existing piping. In this state, the hydraulic cylinder 1h of the diameter expanding and breaking mechanism 1B is extended to make the protruding metal fitting 1d evenly protrude from the inner diameter to the outer diameter side (that is, in the radial direction), and the chisel 1e is attached to the surface of the protruding metal fitting 1d. The existing piping is evenly spread in the radial direction and destroyed, and the surrounding wall surface (peripheral wall) is solidified. When this destruction is completed, the hydraulic cylinder 1 of the diameter expansion destruction mechanism 1B
h is contracted to retract the protruding metal fitting 1d inwardly, and the device main body 1 is pulled forward by the traction device 2. In synchronization with this pulling operation, the hydraulic cylinder 3c of the supply mechanism 3 is extended to supply new piping from the rear to the front side. Therefore, the collapse prevention cover 1C enters the space created by the destruction of the existing pipe to prevent the broken pipe fragments from entering into the inner diameter side, and a new pipe is inserted into this space. That is, as described above, the device main body 1 is guided by the guide mechanism 1A at the front part, and the collapse prevention cover of the above configuration is located close to the rear of the diameter expansion and destruction mechanism, so that the diameter expansion and destruction mechanism 1B The center of the pipe always remains aligned with the center (axial center) of the existing piping, and the destruction progresses. For this reason,
The new pipe will be inserted so that its center coincides with the center of the existing pipe.

The above-described operation cycle is repeated to replace (replace) one new pipe 5 with the existing pipe.
Next, the hydraulic cylinder 3c of the supply device 3 is contracted, a new pipe is placed on the mounting mechanism 3A, and the rear end of the first pipe inserted above and the tip of this second pipe are welded. By repeating the same operation cycle as described above, the existing piping can be replaced with a new piping.

In this way, the existing piping is replaced with new piping for the required length.

By the way, in the above embodiment, as shown in FIG.
The vibration of this vibrator 8 is transmitted to the above-mentioned chisel 1e portion (see Fig. 2) through the frame 1F of the main body of the device, and this vibration and the above-mentioned diameter expansion breaking mechanism 1B (see Fig. 2) are combined. The diameter expanding operation described above may be configured to work together to destroy the existing piping.

In this configuration, when the water pipe or the like is made of cast iron, the vibration effect of the vibrator is extremely useful for destroying the existing pipe.

As described above, the present invention makes it possible to easily replace the existing pipe with a new pipe of the same diameter or a slightly larger diameter by using the existing pipe as a guide without excavating the ground surface. In addition, since the existing piping is used as a guide and the device body and the new piping connected to the device body are connected by a universal joint mechanism, even if water pipes etc. are installed with a large curvature, New pipes can be installed with curvature just like existing pipes.

In addition, in the above embodiment, the traction device is disposed at the front for forward movement of the device body, but by using a large capacity hydraulic cylinder of the supply device disposed at the rear, the traction device can be moved forward. It is also possible to omit the device.

Additionally, since water pipes are generally made of brittle materials such as cast iron, the diameter of the pipes required for destruction is small. Since the elevation of the ground at the buried location is negligible, there is almost no impact on existing ground pavement, etc.

(Effects of the Invention) The water pipe replacement device according to the present invention can replace existing pipes without excavating the ground surface while keeping the centers of the new pipes and new pipes almost the same. etc., construction work can be carried out without restricting traffic at intersections.
Therefore, replacement work inside intersections, etc., which has traditionally been very difficult due to legal regulations, can be easily carried out.

In addition, since replacement work can be performed without destroying the surface pavement, etc., there is no need for repair work as in the past, saving construction costs and shortening the construction period. In particular, in the case of places where broken stones or tiles are used for surface paving, resurfacing costs a considerable amount of money, but since there is no need for repair work by excavating the ground surface, considerable construction costs can be saved. There are merits.

Furthermore, workers are freed from the work at intersections with heavy traffic, reducing the risk of being involved in traffic accidents, and contributing to improved worker safety.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of a water pipe replacement site showing the overall configuration of the replacement device according to the present invention, FIG. 2 is a side sectional view showing the detailed structure of the main body of the device in FIG. 1, and FIG. is a cross-sectional view taken along the X-X line in FIG. 2, FIG. 4 is a cross-sectional view taken along the Y-Y line in FIG. 2, FIG. 5 is a side view showing the detailed structure of the supply device, and FIG. 5 is a cross-sectional view taken along the Z-Z arrow in FIG. 5, and FIG. 7 is a partial side sectional view of the rear part of the device main body, showing another embodiment of the device main body. 1...Device main body, 1A...Guide mechanism, 1B...
... Diameter expansion destruction mechanism (destruction mechanism), 1C ... Collapse prevention cover, 2 ... Traction device, 3 ... Supply device, 4 ...
...Existing piping, 5...New piping.

Claims (1)

[Scope of Claims] 1. When moving forward, it is guided along the existing piping by a guide mechanism disposed in front, and the destruction mechanism pushes the existing piping outward and destroys it, and at the same time, the expanding piping is In a replacement device for water pipes, etc., configured to replace old and new pipes by pressing and supplying new pipes from behind to the damaged part using a supply device, the above-mentioned breaking mechanism protrudes evenly in the radial direction. A diameter expansion/destruction mechanism configured to evenly press and destroy the existing piping from the inner diameter side to the outer diameter side using a plurality of protruding members installed around the existing piping so as to freely protrude in the radial direction. The guide mechanism is provided with guide means such as rollers around the periphery to guide the center of the destruction mechanism to be located at the center of the existing piping, and a collapse prevention cover is disposed close to the rear of the destruction mechanism. What is claimed is: 1. A replacement device for water pipes, etc., characterized in that the outer diameter of the tip thereof is equal to or smaller than the inner diameter of the rear end of the breaking mechanism, and has a tapered portion with an enlarged diameter on the rear end side.