JPH0291394A - Exciter for buried pipe and deformed pipe recovery method and sediment filling method using exciter - Google Patents

Abstract

PURPOSE:To substantially reduce manpower and expenses required for the recovery of a deformed buried pipe by using a base body shiftable within the pipe, a vibration body connected to the base body and an exciter for the buried pipe comprising a vibration generation means for forcibly actuating the vibration body. CONSTITUTION:An exciter 4 for a buried pipe is taken into a cable pipe 1 and a vibration generation means is vibrated. As a result, a vibration body 402 connected to a base body 401 is forcibly vibrated and the internal surface of the cable pipe 1 in contact with the vibration body 402 is subjected to a uniform outward exciting force. When the cable pipe 1 locally deformed is repaired, the exciting force is applied to the deformed part of the pipe 1. Also, when the cable pipe 1 is again buried, the exciter 4 is moved while applying an exciting force to the internal surface of the pipe 1, the pipe 1 is buried and sediment 3 is compacted. According to the aforesaid construction, it is possible to repair a locally deformed buried pipe in a buried condition and completely fill sediment in a gap between pipes when buried.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides an exciter for buried pipes that can be used for burying and repair work of light bulb tubes, etc. that accommodate communication cables, a method for restoring deformation of pipes using the same, and This article relates to a method of filling earth and sand for backfilling pipes.

[Prior Art] When conduits for accommodating communication cables are buried underground using the cut-and-cover method, the pipes are usually buried in an arrangement as shown in FIG. In Fig. 3, 1 indicates the electric conduit, 2 indicates the gap between the pipes, and 3 indicates the earth and sand for backfilling the pipe.

In this type of pipe burying work, a plurality of electrical conduits 1 are fixed to each other at certain intervals so as not to shift vertically or horizontally. The gap 2 between the pipes is usually filled with sand, then the excavated part is backfilled, and after the conduit is buried, the cable is led into the pipe. A hard vinyl chloride pipe is used as the conduit. Often.

[Problems to be Solved by the Invention] As mentioned above, when burying electrical conduits, there are usually
The excavated area is backfilled after being filled with sand, but
It is difficult to fill the gaps with sand, and the filling tends to be insufficient, which is a factor in the subsidence of the ground surface after backfilling. In addition, if the gaps between the pipes are not filled with backfilling earth and sand sufficiently, bending loads will be applied to the conduit due to the overload, and gravel etc. will get into the gap when backfilling the excavation, causing the conduit to become damaged. This may cause local deformation. FIG. 4 shows an example of a conduit that has been locally deformed by an external force.

When replacing communication cables using existing buried conduits, if the conduit is locally deformed as shown in Figure 4, it will be impossible to pull in the new cable, and the deformed conduit cannot be replaced. It becomes unusable. Therefore, if there is no spare conduit, and even one of the multiple buried conduits is deformed, it is necessary to excavate it from the ground again, take out the deformed conduit, and repair or replace it. The current situation is that a great deal of effort and expense is expended.

For these reasons, in the field of maintenance of existing buried pipes, there has been a desire to develop a technique that can restore locally deformed buried pipes while still being buried. Furthermore, as a fundamental measure to eliminate the causes of ground surface subsidence and deformation of buried pipes after backfilling, the issue is to develop a technology that can sufficiently fill the gaps between pipes with backfill earth and sand during pipe burying. was.

An object of the present invention is to provide a vibrator for buried pipes that is effective in solving these problems, a method for restoring pipe deformation, and a method for backfilling a pipe with earth and sand using the same.

[Means for Solving the Problems] In order to achieve the above object, the buried pipe exciter of the present invention has the following features:
a base body that is movable with its outer circumference supported by the inner surface of the buried pipe; a vibrating body whose cross section is similar to the cross section of the pipe and connected to the base body in the axial direction via a vibration isolating support; vibration generating means for forcibly vibrating the body with a constant amplitude in the radial direction so as to apply a uniform outward excitation force to the inner surface of the tube in contact with the vibrating body; It is equipped with a connecting part.

The vibration generating means includes a drive shaft supported at the center of the base;
It can be configured with an eccentric shaft that receives rotational force from the drive shaft and swings around inside the vibrating body.

Further, it is preferable to provide a hot air or hot water supply port on the outer periphery of the vibrating body that comes into contact with the inner surface of the tube for restoring the plastically deformed tube, which will be described later.

The pipe deformation restoration method of the present invention involves inserting the above-mentioned buried pipe vibrator into a locally deformed pipe buried underground, and applying the generated excitation force to the deformed portion of the pipe. It is characterized by restoring the cross section of the tube.

Also, for buried pipes that have been locally plastically deformed.

The above-mentioned buried pipe exciter is inserted into the pipe, and after or while supplying warm air or hot water from the supply port provided on the outer circumference of the vibrating body, the generated excitation force is applied to the deformed part of the pipe. There is a method of restoring the plastically deformed pipe cross section by applying the action.

Furthermore, the pipe backfilling earth and sand filling method of the present invention is as follows.

By inserting the above-mentioned buried pipe vibrator into a pipe buried underground and applying the generated excitation force to the pipe backfill earth and sand filled around the pipe through the pipe wall, pipe backfill earth and sand can be created. It is characterized by compaction.

[Function] When the exciter for buried pipes of the present invention is connected to a traction device such as a wire rope that has been passed through the buried pipe in advance and is pulled into the pipe and the vibration generating means is activated, the outer circumference of the base comes into contact with the inner surface of the pipe. With the base body supported by the base, the vibrating body connected to the base generates forced vibration with a constant amplitude in the radial direction, giving a uniform outward excitation force to the inner surface of the tube in contact with the vibrating body. When repairing a permanently deformed pipe, by applying this excitation force to the deformed part of the pipe, the deformed part is expanded from the inside while the pipe remains buried, and the pipe is restored to its normal cross section (circular). ) can be restored. that time.

If the excitation force is applied after or without supplying hot air or hot water from the supply port on the outer periphery of the vibrating body that contacts the inner surface of the tube, the tube can be easily deformed even if the tube has undergone plastic deformation. Deformed parts can be restored without destruction.

In addition, when backfilling a buried pipe, if the vibrator is moved without applying any excitation force to the inner surface of the pipe, the excitation force transmitted through the pipe wall will cause the backfilling earth and sand filled around the pipe to Since it is vibrated and consolidated, it is possible to completely fill the spaces between the pipes with backfill earth and sand.

[Example] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram illustrating a method for restoring a locally deformed conduit 1 according to the present invention. In FIG. 1, reference numeral 4 indicates a vibrator for buried pipes according to the present invention, and reference numeral 5 indicates a traction tool.

FIG. 2 is a longitudinal sectional view showing an example of the vibrator for buried pipes according to the present invention. In FIG. 2, reference numeral 401 denotes the base of the vibrator 4. In this example, the entire body is formed into a cylindrical shape, but it is not necessarily cylindrical; , it suffices that it be supported with its center almost aligned with the tube axis. 402 is a vibrating body, and the cross section is similar to the normal cross-sectional shape (circle) of the conduit 1. It is formed into a substantially cylindrical shape having a conical end portion 402a and a stepped outer peripheral portion 402b continuing therefrom.

402c is a connecting portion with the traction tool 5. Reference numeral 403 denotes a vibration isolating support such as vibration isolating rubber for preventing the vibration of the vibrating body 402 from being transmitted to the base 401 side. axially connected. Reference numeral 405 denotes an eccentric shaft for generating vibrations, which is rotatably supported inside the vibrating body 402 via eccentric shaft bearings 406 and 407.

408 is a rotation transmitting device such as a flexible joint that can follow the amplitude of the vibrating body 402, and the base body 401 is transmitted through this
Rotational force is transmitted from the side drive shaft 409 to the eccentric shaft 405.

410 is a drive shaft bearing provided in the center of the base body 401, and 411 is a drive shaft 4 from a rotary drive device (not shown).
09 is a rotation transmitting device such as a flexible shaft that transmits rotational force, 412 is an acceleration sensor for measuring vibration acceleration attached to the vibrating body 402, and 413 is a supply for supplying hot air or hot water to the deformed part of the conduit 1. With the mouth, the vibrating body 402
An appropriate number of stepped outer peripheral portions 402b are provided at equal intervals in contact with the inner surface of the conduit.

The supply port 413 has a supply pipe 4 connected to the base 401 side.
14, a base 401, a vibration isolation support 403, and a vibrating body 402
Hot air or hot water can be supplied through a supply passage 415 provided through the interior.

Next, with reference to FIGS. 1 and 2, the method for restoring pipe deformation according to the present invention will be described.

(1) A traction tool 5 such as a wire lobe is passed in advance through the locally deformed electrical conduit 1 buried underground, and the traction tool 5 and the buried pipe exciter 4 are connected using a manhole.

(2) Pull the other end of the traction tool 5 to draw the buried pipe vibrator 4 into the conduit 1.

(3) In the buried pipe vibrator 4, the outer diameter of the base 401 is made slightly smaller than the inner diameter of the conduit 1 to the extent that the base 401 can move while being supported on the inner surface of the conduit 1, and The outer diameter of 402 (maximum diameter at stepped outer peripheral portion 402b) is smaller than the inner diameter of electric conduit 1 by both amplitudes.

(4) From this, the buried pipe vibrator 4 that is pulled into the conduit 1 by the traction tool 5 can be pulled in without resistance if the cross-sectional shape of the conduit 1 is normal (circular). . However, if the cross-sectional shape of the conduit 1 is locally deformed as shown in FIG. 4, the deformed portion 1
Abnormal resistance occurred when the buried pipe vibrator 4 reached the point a.
It becomes impossible to pull in.

(5) When the buried pipe vibrator 4 can no longer be pulled in smoothly, a rotary drive device (not shown) installed in the manhole or on the ground is activated to rotate the eccentric shaft 405.

(6) Vibrations caused by the rotation of the eccentric shaft 405
It is generated by the eccentric moment when the eccentric shaft 405 swings around inside the
:a Excitation force:E E:mru" where M: Mass of the vibrating body 402 m; Mass of the eccentric shaft 405 mr: Eccentric moment ω: Forced vibration with a constant amplitude expressed by angular velocity. The excitation force increases or decreases in proportion to the square of the rotation speed.

(7) The rotation of the eccentric shaft 405 gradually increases the rotation speed while applying tension to the traction tool 5 to increase the excitation force, and the rotation speed becomes constant from the time when the buried pipe exciter 4 starts moving forward. Do it like this.

(8) The locally deformed deformed portion 1a of the conduit 1 first comes into contact with the tip conical portion 402a of the vibrating body 402, and is gradually restored while receiving the excitation force E.

(9) Since the vibration of the vibrating body 402 is a forced vibration with a constant amplitude, the tube cross section will not expand beyond the normal cross section even if the excitation force is increased.

(10) Obstacles or restraining forces that locally deform the pipe are eliminated by vibrations from within the pipe.

(11) If the pipe is considered to be plastically deformed.

By supplying warm air or hot water to the deformed portion 1a of the tube from the supply port 413 and applying an excitation force to the deformed portion 1a while heating and softening it, the tube can be restored without being destroyed.

The above is a case where the buried pipe vibrator of the present invention is used as a restoration device for locally deformed conduit. It can also be used as a filling machine for backfilling the gaps between pipes.

The steps (1) to (3) above are the same in this case, but after pulling the buried pipe vibrator 4 into the pipe, the eccentric shaft 405 is rotated at a constant rotation speed to shake the inner surface of the conduit 1. Move this vibration exciter without applying any excitation force to the entire area. Then, due to the excitation force transmitted through the pipe wall, the conduit 1
The backfilling earth and sand 3 filled around the pipes is vibrated and consolidated, and the gap 2 between the pipes is completely filled.

[Effects of the Invention] As described above, the buried pipe vibrator of the present invention is useful for restoring the deformation of electrical conduits buried underground, and for backfilling with earth and sand when newly burying pipes. It is. That is, according to the pipe deformation restoration method of the present invention using the above-mentioned buried pipe vibrator, it is possible to restore a locally deformed existing buried pipe to its normal cross-sectional shape while it remains buried underground. Therefore, the labor and cost conventionally required to repair or replace locally deformed pipes by excavation can be significantly reduced, and the construction period can also be shortened. In addition, according to the pipe backfilling earth and sand filling method of the present invention using the above-mentioned buried pipe vibrator, the surrounding backfill earth and sand can be consolidated by vibration from inside the pipe, so that the gap between the pipes can be It is now possible to completely fill the backfill with earth and sand, which has the effect of preventing subsidence of the ground surface and deformation of the buried pipe that would occur due to insufficient filling of backfill earth and sand.

[Brief explanation of the drawing]

11th! 1 is a diagram showing the implementation procedure of the pipe deformation restoration method according to the present invention, FIG. 2 is a longitudinal cross-sectional view showing an example of the vibrator for buried pipes according to the present invention, and FIG. The figure shown in FIG. 4 is a sectional view showing an example of a conduit locally deformed by an external force. DESCRIPTION OF SYMBOLS 1... Electric conduit, 1a... Deformed part of a pipe, 2... Gap between pipes, 3... Tube backfill earth and sand, 4... Vibrator for buried pipes. 5... Traction tool, 401... Base body, 402... Vibrating body, 402C... Connection portion with the traction tool, 403... Vibration isolation support, 405... Eccentric shaft, 406.407 ...
Eccentric shaft bearing, 408...Rotation transmission device, 409
... Drive shaft, 410 ... Bearing for drive shaft, 41
1...Rotation transmission device, 413...Hot air or hot water supply port.

Claims (1)

[Scope of Claims] 1. A base body that is movable while its outer peripheral portion is supported by the inner surface of the buried pipe, and a cross section that is similar to the cross section of the pipe, and that is connected to the base body in the axial direction via a vibration isolating support. a vibration generating means for forcibly vibrating the vibrating body with a constant amplitude in the radial direction so as to apply a uniform outward excitation force to the inner surface of the tube in contact with the vibrating body; A vibrator for buried pipes, which is equipped with a connecting part to a traction tool on the free end side. 2. The buried device according to claim 1, wherein the vibration generating means comprises a drive shaft supported at the center of the base body, and an eccentric shaft that receives rotational force from the drive shaft and swings around inside the vibrating body. Vibrator for pipes. 3. The exciter for buried pipes according to claim 1, further comprising a hot air or hot water supply port on the outer periphery of the vibrating body that contacts the inner surface of the pipe. 4. Claim 1 in a locally deformed pipe buried underground
Alternatively, a pipe deformation restoring method comprising inserting the buried pipe vibrator according to item 2 and applying the generated excitation force to the deformed portion of the pipe, thereby restoring the deformed pipe cross section. 5. Claim 3 in a locally deformed pipe buried underground
By inserting the described vibrator for buried pipes and supplying hot air or hot water from the supply port on the outer periphery of the vibrating body, or while supplying the vibrating force, the generated excitation force is applied to the deformed part of the pipe. , a pipe deformation restoration method characterized by restoring a plastically deformed pipe cross section. 6. In pipe burying work, the buried pipe exciter according to claim 1 or 2 is inserted into the pipe buried underground, and the generated excitation force is applied to the pipe backfilling around the pipe through the pipe wall. A pipe backfilling method characterized by compacting the pipe backfilling soil by acting on the soil.