JPS63206597A - Buried pipe replacement construction equipment - 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. 4B-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 pooling 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 disposed on the reaching side bit 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.
Publication No. 7398 υ is described. By using hydraulic jacks, 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. In that case, it will be necessary to use an impact-type propulsion device to pull 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. Furthermore, a structure is desired in which the members for towing the new pipe do not protrude into the ground, and the forward movement of the new pipe during towing by hydraulic jacks is not obstructed. On the other hand, with a hydraulic jack, it is not possible to wind up a long wire rope as described above, and it is necessary to re-grip the wire rope with each stroke of the jack.
It is not easy to grasp it so as to 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 was made to solve the above-mentioned problems.
The purpose of this is to allow the new pipe to move forward without being damaged during burying work, to allow smooth movement of the impact propulsion machine and the new pipe, and to improve workability when adding new pipes. This makes it possible to simplify and speed up operation, and also enables the adoption of a traction member that is easy to connect with a hydraulic jack, solving the above problems that occur when using a wire rope. It is possible to install and remove the traction member even in narrow bits, eliminate the problem of breakage at the connection point between the traction member and the impact type propulsion machine, and eliminate the problems that arise when using the existing pipe while crushing the existing pipe. An object of the present invention is to provide a buried pipe replacement construction device capable of quickly constructing a new 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.

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;
At the rear of the is a connecting member 8 attached to the crushing head 4.
A pushing member 9 is provided to move the new pipe 7 forward through the pushing member 9, and the impact crushing body 1 crushes the existing pipe 6 while burying 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 rear part of the connecting member 8 connected to the jack 2 is constructed by sequentially connecting the steel rods 14 that have been removed on the hydraulic jack 2 side, and the rear part of the connected steel rod 14 is connected to the pushing member 9 and removed. It can be installed freely.

[For production]

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,
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 if the steel rod 14 pulled out into the pit 19 is uncoupled by the hydraulic jack 2, the steel rod 14 can be removed even in a narrow pit. Steel rod 14
has high rigidity, making it easy to connect subsequent steel rods to the hydraulic jack 2.

On the other hand, the connection between the connected steel rod 14 and the impact crushing body 1 is through a flexible connecting material 31, so that even if the impact crushing body 1 tilts while moving forward, the visible connecting material 31 absorbs it, and the steel rod Bending is not immediately applied to the steel rod 14, and breakage of the steel rod 14 does not occur.

The new pipe 7 is supported by the impact crushing body 1 and the pushing member 9 behind it, and is connected and fixed by the connecting member 8 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 advancement of the new pipe 7 by the pushing member 9 is as follows:
This is done 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 when moving forward, and the huge force of the hydraulic jack 2 is directly applied to the new pipe 7. Not at all.

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.

〔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, the diameter is 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, making it possible to work in places with little 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.

Furthermore, 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 together. The new pipe 7 always moves forward accompanying the impact crushing body 1. Since the connecting member 8 is inside the new pipe 7 and does not protrude into the ground, 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 capacity of the pipe 7 is also small, and there is no possibility that a huge force will directly affect the new pipe 7.

In addition, the steel rod work 4 recovered at Pit 1-19 was transferred to Pit 5.
The compatible steel rods 14 can be used to connect the new pipe 7 one after another. As a result, it is sufficient to prepare the number of steel rods 14 corresponding to the length of the construction section, and it is possible to prevent waste of materials such as preparing a large number of steel rods.

〔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 that is attached to the tip and has a substantially conical shape and has a larger diameter than the propulsion device 3, and is plunged through a pit 5 such as a 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 head 4 is suitable for crushing an existing pipe 6 such as a ceramic pipe, and it is sufficient if 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 a nut 11. 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. A locking device such as a pin 10 attaching the wire rope 12 to the crushing head 4 is
It is arranged in the radial direction of the crushing head 4, and its tip is brought as close as possible to the outer surface of the impact propulsion device 3. This prevents the wire rope 12 from coming off the pin 10 and stabilizes the locked state of the connecting member 8.

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 14-B 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 succeeding new pipe 7B are:
This is done with a connecting ring 18 with 0-rings 16, 17. Steel rod 14B that newly constitutes the rear part of the connecting member 8
is removed at a pit 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 18 (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 propulsion device 3 and the crushing head 4 are only fitted at the tabular 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 described above. A partition wall 26 is provided. As shown in FIG. 5, a round hole 27 having the same diameter as the impact type propulsion device 3 is opened therein, and cutouts 28 are formed at the top and bottom of the hole 27 to allow the wire row 112 described above to be inserted therethrough.

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 impact crushing body 1 is moved forward.
The new pipe 7 is buried underground while removing the broken pieces of the existing pipe 6 underground.

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
Width of pins 1-5 and 19 formed at least on the road side.

If the length is shorter than the width, connection and removal work of the steel rod 14 will be easier. Conversely, if the steel rods 14 are made short, the steel rods 14 can be connected even if the pit width is not sufficient, and therefore reliable and strong traction by the connected steel rods 14 can be achieved. It becomes possible.

Incidentally, if the length is set to be approximately the same as the new pipe 7, the steel rod 14 can be removed when the new pipe 7 moves forward by one length. 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 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
Avoid the breakage of raw materials at the connection part with the hydraulic jack 2.
It is possible to reduce the transmission of vibration to. 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 l, and is reduced in diameter. It has a connecting structure that is locked so that it does not come off at the stepped part.

The wire rope 33 is fixed to the locking tool 35 as shown in FIGS. 6(a) and 6(b).

First, the rear part of the wire rope 33 is drawn into the crushing head 4 in advance, and then inserted into the hole of the cylinder 37. 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 row 133 will not come off. In addition,
The connection between the flexible connecting member 31 and the impact crushing body 1 is not limited to the crushing head 4, but may be connected by providing a metal fitting at the front 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.

As shown in FIGS. 7(a) and 7(b), this type of hydraulic jack 2 such as a hydraulic cylinder is connected to a retracting joss 1-41 on a platform 4o installed at the bottom of the pit 19. It is attached between the joston 42 and the joston 42. 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. The nut 2 in front of the pulling back joston 42 comes into contact with the nut 2 when it is pulled back, and prevents the hydraulic jack 2 from being excessively contracted.

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 shown in FIG. 7 (L+) to the position advanced by one stroke L of the hydraulic jack 2 as shown in FIG. 8 (a). . 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 steel rod 14M is removed from the steel rod fixture 32.

Such work can be carried out without any problem even in the narrow pit 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 after the new pipe 7A that has advanced underground. First, Nando 11 was removed,
Push member 9 is removed. As shown in FIG. 9, a steel rod 14B, which has already been removed from the pit 19 by 1ft, is connected to the steel rod 14A at the rear portion of the connecting member 8 using a connector 15. Fit the connecting ring 18 onto the preceding new pipe 7A and connect the new pipe 7.
B, and pass the pushing member 9 through the steel rod 14B to connect the new pipe 7.
Place it on the rear of B and secure with 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.

In such an operation, the crushing head 4 of the impact crushing body 1
Even if the steel rod 14 that forms the traction member 30 is tilted while moving forward, the connection between the connected steel rod 14 and the impact crushing body 1 is via the flexible connecting member 31, so that the steel rod 14 constituting the traction member 30 is immediately bent. Therefore, the steel rod 14 does not break.

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 l 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, which eliminates the need for a wide pit. do not. Of course, the pit 5 that connects the steel rods
It's also narrow. Both the work of connecting the subsequent steel rod 14 in the pit 19 to the hydraulic jack 2 and the work of connecting the steel rods 14 in the pit 5 can be completed in a short time.

Then, the pushing member 9 at the rear of the impact crushing body 1 is moved to the new pipe 7.
Since the new pipe 7 is attached to the one-fat crushing body 1 by being pulled by the inner connecting member 8, the new pipe 7 moves forward reliably and smooth forward movement is maintained without any protrusions. Furthermore, since the new pipe 7 moves through the space after the existing pipe 6 has been crushed, there is less frictional resistance, and the capacity of the hydraulic jack is also small. 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 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 line V-V 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 shovel, 3-Impact propulsion machine, 4-Crushing head, 6-Existing pipe, 7, 7A, 7B-1-
New pipe, 8-connecting member, 9-pushing member, 14.14A, 1
4B, 14M, 14N-1 steel rod, 15-connecting tool, 30-
Traction member, 31--flexible connection material.

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. and behind the impact crushing body,
The underground pipe replacement construction device is provided with a pushing member that advances the new pipe via a connecting member attached to a crushing head, and buries the new pipe underground while crushing the existing pipe with the impact crushing body. The traction member is composed of a plurality of steel rods connected by a connecting device and a flexible connecting member connected to the rear end, and the front portion of the connected steel rod is connected to the hydraulic jack. The rear portion of the connecting member is configured by sequentially connecting the steel rods that have been removed on the hydraulic jack side, and the rear portion of the connected steel rod is removably attached to the pushing member. A buried pipe replacement construction device characterized by: