JPS63206595A - Buried-pipe exchanging execution device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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. For example, in underground pipe work, etc.
It is especially used in the field of small diameter propulsion methods.

[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 Publication No. 46-16645, and penetrates a hole having a large outer diameter in the main body. Construction methods using such impact-type propulsion machines include the expander method (for example, Japanese Patent Publication No. 49-9924), which attaches a mantle that covers the main body and expands the diameter of the through hole, and directly pushes the buried pipe. There are ramming methods for constructing pipes, and booling methods for towing underground 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. Can be done. This idea has recently been attracting attention, but simply using the above-mentioned impact type propulsion machine cannot generate enough forward force to crush the existing pipe and bury the new pipe. Therefore, supplementary measures are required.

In the above-mentioned underground pipe replacement work, the space of the existing pipe can be used. That is, a winch may be placed in the pit on the reaching side of the impact type propulsion device, a wire rope connected to the tip of the impact type propulsion device is inserted into the existing pipe, and the wire rope is pulled by the winch. Since the winch can wind up long wire ropes, it has the advantage of not requiring a larger bit. An example of pulling such a lobe with a winch is described in Japanese Patent Publication No. 50-2524, but it can only be applied to the expander tick method at best. This is because the winch's traction power is limited, 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 JP-A-60-3.
It is described in Publication No. 7398. 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 is at the front and moves forward, which increases the chance 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 regrip the wire rope every time the jack strokes, and at that time, it is not easy to handle the wire rope so that it can withstand the 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 was made to solve the above-mentioned problems.
The purpose is to realize the adoption of a traction member that is easy to connect with a hydraulic jack, which can solve the above problems that occur when using a wire rope. , the traction member can be installed and removed even in a narrow focus, it is possible to eliminate breakage at the connection point between the traction member and the impact propulsion machine, and it is possible to quickly construct a new pipe at the same location while crushing the existing pipe. It is an object of the present invention to provide a buried pipe replacement construction device that can perform buried pipe replacement.

[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.

The impact crushing body 1 is equipped with an approximately conical crushing head 4 having a diameter larger than that of the propulsion machine at the tip of the impact type propulsion machine 3, and a traction member 30 inserted through the existing pipe 6 is used to crush the impact crushing body 1. a hydraulic jack 2 for advancing the impact crushing body 1;
This is a buried pipe replacement construction device that crushes the existing pipe 6 and buries the new pipe 7 underground. 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.

[For production]

A crushing throat 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.
A crushing head 4 crushes the existing pipe 6. On the other hand, the impact crushing body 1 is being towed by the powerful force of the hydraulic jack 2 via a traction member 30 consisting of a connected steel rod 14 inserted through the existing pipe 6, and the impact crushing body 1 is crushed. The new pipe 7 is buried while pushing away the broken pieces of the existing pipe 6 underground.

The traction member 30 is a connected steel rod 14, and by uncoupling the steel rod 14 pulled out to the bit 19 with the hydraulic jack 2, the steel rod 14 can be removed even within a narrow focus. 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 Bending is not immediately applied to the rod 14, and breakage of the steel rod 14 does not occur.

〔Effect of the invention〕

In the present invention, the IH crushing body is composed of an impact type propulsion machine and a crushing head attached to its tip, and the impact crushing body is towed by a hydraulic jack. It is possible to crush a large existing pipe with a crushing head, advance the impact crushing body with the powerful force of a hydraulic jack, and bury a new pipe at the location of the existing pipe. Since the impact crushing body is towed by a connected steel rod, the steel rod pulled out with a hydraulic jack can be removed, and a wide bit is not required for this purpose, making it possible to work in places with limited construction space. It becomes possible. Furthermore, connecting the subsequent steel rod to the hydraulic jack is extremely easy and simple compared to connecting a wire rope, and the time required for the work 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 is
It consists of an impact type propulsion device 3 and a crushing head 4 which is attached to the tip and has a substantially conical shape with a larger diameter than the propulsion device 3, and is plunged through a bit 5 such as a vertical shaft formed on one road side. 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 spatula 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 Huum 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 longitudinally, and its front part is attached to the two pins 10 of the crushing head 4 by being hooked and turned, while the rear part is attached to the center position of the pushing member 9. It can be removably attached with Nara l-11. That is, since the connecting member 8 consisting of the wire row 112, the connecting member 13, and the steel rod 14 does not protrude from the outer periphery of the new pipe 7, it may obstruct the forward movement of the impact crushing body 1 or easily damage the connecting member 8. There's nothing to do. A locking device such as a pin 10 attaching the wire rope 12 to the crushing head 4 is arranged in the radial direction of the crushing head 4, with its tip 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 wire rope 12 is used as the connecting member 8 because
This is because the tensile force can be applied regardless of the shape of the impact type propulsion device 3. The reason why the steel rod 14 is used to attach the pushing member 9 is that when adding a new pipe 7, the third
This is because the steel rods 14A and 14B can be easily connected using a connector 15 such as a threaded coupling as shown in the figure. In addition, as shown in FIG. 4 before connecting the steel rod 14,
The preceding new pipe 7A and the subsequent new pipe 7B to be added are 0.
- carried out in a connecting ring 18 with rings 16, 17; A steel rod 14B that newly constitutes the rear portion of the connecting member 8 is removed using a bit 19 (see FIG. 2), which will be described later, and is attached to the pushing member 9 with a nut 11.

Note that the steel rod 14 is an inexpensive rolled steel rod having threaded ribs formed over its entire length.

By the way, the new pipe 7 has a pushing member 9 pulled by the connecting member 8.
In order to stably maintain the installed position of the new pipe 7, a guide pipe 20 shown in FIG. A support ring portion 21 is formed. 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 device 3. There is. In order to prevent the cushioning material 22 from being lost underground or being consumed in a short period of time,
A groove for the connecting ring 1B (see FIG. 4) formed at the tip of the new tube 7 is covered with a collar 23 that fits therein. On the other hand, the impact type propulsion device 3 and the crushing head 4 are only fitted at the tapered surfaces 24, 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. As shown in FIG. 5, this has a round hole 27 having the same diameter as the impact type propulsion device 3, and the above-mentioned wire rope 12 is inserted through the upper and lower portions of the round hole 27. A notch 28 is formed.

The above-mentioned hydraulic jack 2 exerts a strong traction force to move the impact crushing body 1 forward, and as shown in FIG. 2, it is installed, for example, in a pit 19 formed on the other side of the road 29. Ru. 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 in the ground while removing the fragments of the existing pipe 6 crushed by the crushing body 1 for 1 hour into the ground. do.

By the way, the above-mentioned traction member 30 is composed of a plurality of steel rods 14 connected by the same connecting tool 15 as described above, and a flexible connecting member 31 connected to the rear end. 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
If it is shorter than at least the width and length of the pits 5 and 19 formed on the roadside, the work of connecting and removing the steel rod 14 will be easy. Conversely, if the steel rods 14 are made short, the steel rods 14 can be connected even if the bit width is not sufficient, and therefore reliable and strong traction by the connected steel rods 14 can be achieved. It becomes possible.

By the way, if you make it approximately the same length as new pipe 7, it will be new pipe 7.
The steel rod 14 can be removed when it moves forward by one length.

Therefore, the steel rod 14 can be removed using the interruption time when the new pipe 7 is being added to the pit 5.
Interruption of burial work can be shortened.

As shown in FIG. 1, the above-mentioned flexible connection part 31 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 impact crushing body 1
Avoiding breakage that is likely to occur at the connection with the hydraulic jack 2
It is possible to reduce the transmission of vibration to. The flexible connecting member 31 includes a connecting tool 3-4 and a locking tool 35, of which the locking tool 35 is fitted into a cylindrical space 3G inside the tip of the crushing head 4 constituting the impact crushing body 1, and has a small diameter. It has a connecting structure that is locked at the stepped part to prevent it from coming off. The fixing of the wire row 133 in the locking tool 35 is as follows:
This is carried out as shown in FIGS. 6(a) and 6(b). First, the rear part of the wire row 133 is drawn into the crushing head 4 in advance, and then inserted into the hole of the cylinder body 37. pin 3
8 is inserted in the radial direction of the cylindrical body 37, and in this state, the wire row 133 is pulled forward to move the cylindrical body 37 along the cylindrical space 36 to the stepped portion. The bottle 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 handle 32 is employed at the location where the steel rods 14 connected as described above are connected to the hydraulic jack 2. This kind of hydraulic jack 2, such as a hydraulic cylinder, has a seventh
As shown in FIGS. (a) and (b), it is attached between a retracting joston 41 and a retracting joston 42 on a platform 40 installed at the bottom of the pit 19. The steel rod fixture 32 is mainly composed of a retracting joston 41 and a nut 43 that is threaded onto the steel rod 14 that protrudes through the joston 41. Note that the nut 44 in front of the retracting joston 42 comes into contact with the joston 42 when the joston 42 is pulled back by the hydraulic jack 2, and prevents the hydraulic jack 2 from excessively contracting.

Next, with the configuration described above, the existing pipe 6 is crushed and the new pipe 7 is crushed.
The embedding operation will be explained. The impact force generated by the impact type propulsion device 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 aged ceramic pipe, to be damaged. is crushed. The impact crushing body 1 includes a plurality of connected steel rods 14 that are inserted into the existing pipe 6 at the front.
It is towed by the large force of the hydraulic jack 2 via a traction member 30 consisting of, etc. The impact crushing body 1 buries the new pipe 7 while pushing away the crushed fragments of the existing pipe 6 into the ground.

That is, the new pipe 7 is moved by the pushing member 9 pulled by the connecting member 8.
is pushed forward by the impact crushing body 1.

When the new pipe 7 in the pit 5 enters the ground by one stroke of the hydraulic jack 2, the extension operation of the hydraulic jack 2 is stopped. The retracting joston 41, which is the steel rod fixture 32 in the pit 19, moves from the initial position as shown in FIG. 7(a) to the position advanced by one stroke L of the hydraulic jack 2 as shown in FIG. 8(a). do. Immediately, the hydraulic jack 2 is reduced as shown in FIG.
is advanced by one stroke L. Therefore, a spacer 47 is interposed between the pulling back joston 42 and a steel abutment plate 46 attached to the concrete wall 45 of the tunnel entrance, as shown in FIGS. Such an operation is repeated, and a large number of spacers 47 are stacked on top of each other as shown in FIG. 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) is removed and the front end wi rod 14M is removed from the steel rod fixture 32.

Such work can be carried out without any problems even within the narrow bit 19. The spacer 47 is removed, the retracting joston 41, the hydraulic jack 2, and the retracting joston 42 are retreated to their original positions, and the subsequent steel rod 14N is tightened to the nut 43.
It is only necessary to fix it to the retracting joston 41 with. 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 to connect the next new pipe 7.

In the pit 5, the next new pipe 7B is connected to the new pipe 7 that has advanced underground. First, nut 11 is removed,
Push member 9 is removed. As shown in FIG. 9, a steel rod 14B, which has already been brought in from the pit 19, is connected to the steel rod 14A at the rear portion of the connecting member 8 using a connector 15. A connecting ring 18 is fitted to the preceding new pipe 7A to add a new pipe 7B, and the pushing member 9 is passed through the steel rod 14B and applied to the rear part of the new pipe 7B, and fixed with a nut 11. In this way, all the existing pipes 6 can be replaced with new pipes 7 by operating the impact type propulsion device 3 again and expanding and contracting the hydraulic jack 2.

1, even if the crushing head 4 of the impact crushing body 1 tilts while moving forward, the connected steel rod 14 and the impact crushing body 1
The connection with the traction member 3 is through a flexible connecting material 31.
Bending is not immediately applied to the steel rod 14 constituting the steel rod 14, and breakage of the steel rod 14 does not occur. Further, the flexible connecting member 31 absorbs a portion of the impact force generated in the impact crushing body 1, and the 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 rod 1 pulled out to the pit 19
4 can be removed one by one, so a wide focus is not required. Of course, the pit 5 for connecting the steel rods can also be narrow. The work of connecting the subsequent steel rod 14 in the pit 19 to the hydraulic jack 2 is also performed by connecting the steel rod 14 in the pit 5.
The connection work in step 4 can also be completed in a short time.

Furthermore, when the new pipe 7 is moved forward, the connecting member 8 does not protrude into the ground outside the new pipe 7 that is being towed by the impact crushing body 1, so that the towing of the impact crushing body 1 will not cause damage. . Furthermore, by transporting the steel rods 14 collected in the pit 19 to the bit 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 waste of materials such as preparing a large number of steel rods.

[Brief explanation of the drawing]

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 buried pipe replacement work, and Fig. 3
The figure is a cross-sectional view of the steel rods connected by a connecting tool, Figure 4 is a cross-sectional view of a new pipe connected by a connecting ring, Figure 5 is a cross-sectional view taken along the ■-■ arrow in Figure 1, and Figure 6 (a) and (b) are explanatory diagrams of fixing procedures for wire ropes constituting the flexible connecting material, Figures 7 (a) and (b) are plan and front layout diagrams of hydraulic jacks and steel bar attachments in Pinto, Figure (a
) to (e) are explanatory diagrams of the expansion and contraction operations of the hydraulic jack and the corresponding displacement operations of the steel rod fixture, and Figure 9 is a diagram of the state in which the next new pipe is added after the first new pipe 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, 14B, 14M. 14N-m-steel rod, 15-connection tool, 3 (1-traction member,
31-Flexible connector.

Claims (1)

[Claims] (1) An impact crushing body with an approximately conical crushing head with a larger diameter than the propulsion machine attached to the tip of the impact type propulsion machine, and a hydraulic jack that advances the impact crusher with a traction member that passes through the existing pipe. A buried pipe replacement construction device that buries a new pipe underground while crushing an existing pipe with the impact crushing body, the traction member comprising a plurality of steel rods connected by a connector, and a flexible connecting member connected to the rear end thereof, the front part of the connected steel rod is connected to the hydraulic jack, and the rear part of the flexible connecting member is connected to the impact crushing body. A buried pipe replacement construction device characterized by being connected to.