JPH0745918B2 - Hard synthetic resin pipe repair device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is to embed a defective portion such as a hollow or a flat portion of a hard synthetic resin pipe buried underground for drawing in a telecommunications cable in the underground. The present invention relates to a device for repairing a hard synthetic resin pipe, which can be repaired in such a state that it can secure a space into which a telecommunications cable can be drawn.

[Conventional technology]

Conventionally, as a first conventional technique for correcting a defective portion such as a depression or a flat portion of a pipeline buried underground, the actual construction is 62-146095.
As disclosed in Japanese Unexamined Patent Publication No. 62-160018, a device provided with a straightening plate capable of expanding the diameter of the duct, as disclosed in Japanese Patent Application Laid-Open No. 62-160018. A device has been proposed that has a special diameter expansion head that can be forcibly inserted and that has a high-frequency generation mechanism at the tip of this diameter expansion head to heat defective areas such as depressions and flats in the pipeline. There is.

[Problems to be Solved by the Invention]

However, in these devices, depending on the type of conduit buried underground, especially in the hard vinyl chloride pipe, the material is different compared to the metal pipe, so it is effective to correct defective parts such as dents and flats. Was not done to. For example, in the device of the first prior art described above, which is equipped with a correction plate capable of radially expanding and contracting in a defective portion such as a hollow or flat portion of a hard vinyl chloride pipe, it is possible to expand the diameter. If the force is removed, it will be restored to the same level as before the expansion, and even if the defective part could be held in the expanded state by the correction plate, the effect of the expansion cannot be obtained in a short time to correct it. Correction is not effective.

Further, in the correction of a defective portion such as a depression or flatness of the metal pipe, the device of the second prior art, in which the defective portion is forcibly inserted by a tapping action after being heated, is, for example, a diameter-expanding head constituting the device. The cone-shaped head is used in the above, and therefore the inner wall of the tube is not straightened, and the force locally acts on such a straightened portion.
The tube itself is burdened and may return to its original defective state.

Further, since the pipe diameter of the defective portion is instantaneously expanded by the diameter expanding head, an external force may be applied before the stabilization after the defective portion is repaired to return to the original unnecessary state.

This invention was invented in order to solve such a problem, in the repair of unnecessary portions such as depressions and flats of the hard synthetic resin pipe, suppression of restoration of defective phenomenon after repair, softened by heating It was proposed in order to maintain the repaired state of the defective part and to correct it in parallel with the inner wall of the pipe.It softens the defective part of the hard synthetic resin pipe by heating and the surface parallel to the inner wall of the pipe is almost circular. The arc-shaped pressing material expands the defective part so that the expanding force and the expanded state can be maintained while the hard synthetic resin pipe hardens, and a normal pipe space can be secured after the hard synthetic resin pipe hardens. An object of the present invention is to provide a repair device for such a hard synthetic resin pipe.

[Means for Solving the Problems]

In order to solve the above problems, the present invention is a repair device for pulling and moving the inside of a hard synthetic resin pipe to correct a recess or flat inside the pipe, and when moving the repair device, Reduce the diameter to the specified diameter in the radial direction,
A straightening member 1 having a plurality of substantially circular arc-shaped pressing members 1a that can be expanded in the radial direction in a pipe that cannot move in the reduced diameter state and is arranged in a machine frame 2 on the machine frame 2, and the straightening member 1 Each pressing member 1a is heated so as to heat the pressing members 1a forming a plurality of arc-shaped pressing members 1a in the radial direction.
A heating wire 3 provided inside, a temperature sensor 4 provided near the heating wire 3, and a heating wire control panel EH for controlling heat generation of the heating wire 3 based on temperature information obtained by the temperature sensor 4.
And a driving means for radially expanding and reducing the pressing member 1a in the radial direction, and a function provided on the outer peripheral portion of the machine frame 2 for contacting a defective portion such as a recess or flat inside the pipe to detect the defective portion. With a ring 10 and the front and rear parts of the machine frame 2
Wheels 12c at the tips of arms 12b, 13b expanded by 12d, 13d,
A repair device for a hard synthetic resin pipe, wherein 13c is constituted by wheel mechanisms 12, 13 adapted to roll on the pipe inner wall.

[Action]

Since the present invention is configured as described above, when the repairing device is inserted into the hard synthetic resin pipe and is moved by pulling, a pressing member having a plurality of substantially arc-shaped surfaces forming the correction member is predetermined in the radial direction. The ring that has a function to detect defective points provided in the repair device in this reduced diameter state comes into contact with a defective part such as a dent or flat in the hard synthetic resin pipe, and this repair device can move. At the defective places such as dents and flats in the lost hard synthetic resin pipe, while heating the plurality of pressing materials with a heating wire, the driving means radially expands the pressing materials to heat the defective areas. After softening, the inner wall of the tube where dents etc. have been spread is expanded in parallel, the heating is stopped and the hard synthetic resin tube is hardened, then the plurality of pressing materials are radially reduced in diameter, and the next defective point In traction to move, to repair the sequential defective portion in the same manner.

〔Example〕

Hereinafter, an embodiment of a repair device for a hard synthetic resin pipe according to the present invention will be described. As shown in FIG.
Manholes, for example to pull in telecommunication cables
It is inserted into a hard synthetic resin pipe (hereinafter, simply referred to as pipe) P buried underground between MHs and pulled by a wire rope L to be moved to correct a defective portion X such as a hollow or flat inside the pipe. The construction and operation of the repair device M will be described in detail according to the embodiment shown in FIG.

FIG. 2 is a side view showing a cross-sectional view of a part of the repair device M when the repair device M is inserted into the pipe P and is pulled and moved by the wire rope L. FIG. 2 a-
It is sectional drawing seen in the a'line.

In these figures, reference numeral 1 is a correction member for a defective portion such as a recess or flat inside the pipe P. When the repair device M is moved, the correction member 1 is reduced in diameter to a predetermined diameter, At the defective portion X in the pipe P which cannot move in the reduced diameter state, one end of four pressing members 1a whose diameters can be expanded are arranged in a substantially circular shape by a driving means described later. Is formed so as to be movable in the radial direction of the machine frame 2. The surface of the pressing member 1a is protected by a protective plate 1b, and the heating wire 3 for heating the protective plate 1b is provided on the surface of the pressing member 1a protected by the protective plate 1b.
FIG. 4 shows the arrangement of the heating wire 3 with the protective plate 1b removed, and reference numeral 4 denotes a temperature sensor provided to control heating by the heating wire 3.

When the repair device M is pulled and moved by the wire rope L in the pipe P, the pressing member 1a is reduced in diameter to a predetermined radial direction, and in the reduced diameter state, the defect in the pipe P as described above is caused. When the repair device M cannot move due to the location X, the driving means for radially expanding the pressing material 1a at the defective location will be described.
Sliding groove 1d having a substantially T-shaped transverse cross section is formed at both ends of the back surface in the longitudinal direction of the inclined surface portion having inclined surfaces 1c in the same direction. On the other hand, the cross section of the inclined surface portion of the slide groove 1d that is slidably contacted with the inclined surface 1c is approximately T.
A slide protrusion 5 having a V-shaped inclined surface 5a and slidably fitted in the slide groove 1d is provided on the spindle 6 integrally or fixed in a substantially cross shape when viewed from the shaft end. FIG. 5 is a side view showing a state in which the slide protrusions 5 are provided on both ends of the support shaft 6 as described above, taken out from FIG.

The right end of the support shaft 6 in the drawing is connected to the rear end (left end in the drawing) of a hydraulic piston 8 provided in a hydraulic cylinder 7 fixed to the machine frame 2. And this hydraulic piston 8
The pressure chamber hose 9 is installed in the front chamber 7a of the hydraulic cylinder 7 with the
So that the pressure oil coming through the hydraulic cylinder 7 flows into the rear chamber 7b of the hydraulic cylinder 7 and the pressure oil coming through the other pressure-resistant hose 9'is formed in the thick portion of the hydraulic cylinder 7. It is designed to flow in through the passage 7c.

The driving means for the pressing member 1a is configured as described above.

When pressure oil is made to flow into the front chamber 7a of the hydraulic cylinder 7 through the pressure-resistant hose 9, the hydraulic piston 8 moves backward (moves leftward in the drawing) as shown in FIG. The slide protrusion 5 having the support shaft 6 connected to the rear end 8a and the four inclined surfaces 5a provided on the support shaft 6 moves backward, and the slide protrusion 5 is inclined to the back surface of the four pressing members 1a. Since the slide concave grooves 1d each having the surface 1c are slidably fitted, these four pressing members 1a are
As shown in FIGS. 2 and 3, the diameter is reduced in the radial direction.

Further, when the pressure oil is made to flow into the rear chamber 7b of the hydraulic cylinder 7 and the pressure oil of the front chamber 7a is discharged through the other pressure resistant hose 9'and the side passage 7c formed in the hydraulic cylinder 7, the hydraulic piston 8 is As shown in FIG. 6, it moves forward (moves to the right in the figure), and therefore the four slide protrusions 5 provided on the support shaft 6 also move forward, so that the four slide protrusions 5 that come into sliding contact with the slide protrusions 5 are moved forward. Sliding groove provided on the back surface of each pressing member 1a
1d is pushed up, and this pressing member 1a is shown in FIGS.
As shown in the figure, the diameter is increased in the radial direction.

As a means for detecting a defective portion in the pipe P, a ring 10 is fitted in a groove 7d formed in a ring shape on the outer circumference of the hydraulic cylinder 7. The outer diameter of this ring 10 is set to the minimum required inner diameter of the pipe P, the inner diameter is set to be shorter than the outer diameter of the hydraulic cylinder 7, and the thickness thereof is the depth of the concave groove 7d provided on the outer circumference of the hydraulic cylinder 7. By making the height substantially equal to the height, it is possible to freely move in the direction perpendicular to the axial direction without being removed from the outer circumference of the hydraulic cylinder 7. The ring 10 does not affect the movement of the repair device M in the normal pipe P as shown in FIG. 8, but the upper part of the pipe P is inward as shown in FIG. If there is a recessed defective part X,
In the flat space portion at the defective portion, the machine frame 2 part constituting the repair device M is pressed against the pipe bottom, at which time the ring 10 rises upward, and the ring 10 is bulged at the defective portion X in the pipe. Therefore, the repair device M is prevented from moving. Thereby, the defective portion of the pipe P is detected. Then, the repairing device M towards the right manhole MH in FIG. 1, a predetermined size of the take-up reel R ₂ wound a predetermined amount of take-up reel R ₁ and electric cord 11 of the pressure hose 9, 9 ' By pulling back, the defective portion X is set to be located substantially in the middle of the correction member 1. Next, the heating wire control board EH is operated on the ground to energize the heating wire 3 provided between the pressing member 1a and the protective plate 1b, and at the same time, the hydraulic device HY is operated to pass the pressure-resistant hose 9 '. The pressure oil flows into the rear chamber 7b of the hydraulic cylinder 7, the hydraulic piston 8 is advanced as shown in FIG. 6, and the slide protrusion 5 which is advanced in cooperation with the hydraulic piston 8 through the support shaft 6 is moved. Then, the heated pressing member 1a and its protective plate 1b are radially expanded to press the inward bulging portion of the defective portion X in the pipe P while heating. Then, the bulging portion is corrected so that the inner diameter of the tube P expands as the tube P is heated and softened, and finally becomes substantially equal to the inner diameter of the normal tube P. Then, when the energization is stopped and the pipe P is cooled and hardened, the pressure oil is caused to flow into the front chamber 7a of the hydraulic cylinder 7, and the second
As shown in the figure, the hydraulic piston 8 is moved backward to push the pressing member 1a.
Is reduced in diameter, and the repair device is moved to the repair position of the next defective portion.

In order to prevent excessive heating and pressurization of the defective portion of the pipe P, the temperature sensor 4, the heating wire control board EH, and the hydraulic device HY provided on the pressing member 1a are automatically controlled. I am trying to do it. For example, when the temperature detected by the temperature sensor 4 reaches a predetermined value, the heating wire control panel EH stops energizing the heating wire 3 and the temperature drops to a predetermined value.
The power is turned on again. Also in the hydraulic device HY, the same operation is automatically performed at a predetermined pressurization value.

Further, in the case where the inner diameter of the pipe P needs to be reinforced, the reinforcing material is held on the outer periphery of the protective plate 1b of the pressing material 1a,
It is also possible to reinforce the inner wall of the pipe by performing the same operation as described above and crimping the reinforcing material to the inner wall of the pipe.

In FIGS. 2 and 6, reference numeral 12 denotes a wheel mechanism provided on the rear side of the repair device M, which includes a support member 12a fixed to the hydraulic cylinder 7 and two rotary members which rotate in a direction perpendicular to the plane of the drawing. The base ends of the arms 12b (the other arm is not shown) are rotatably supported, and the wheels 12c are attached to the tips of these arms 12b.
By d, the wheel 12c can be pressed against the inner wall of the pipe with a predetermined pressing force to move.

Further, 13 is a wheel mechanism provided on the front side of the repair device M, and a support member 13a is fixed to the rear end of the support shaft 6 provided with the four slide protrusions 5, and this support member 13a is shown in FIG. The base ends of the two arms 13b, 13b that rotate in the vertical direction are rotatably supported, and the wheels 13 are attached to the tips of these arms 13b, 13b.
c, 13c are attached, and these arms 13b, 13b are spring 13
The wheels 13c, 13c can be moved by pressing the wheels 13c, 13c against the inner wall of the pipe with a predetermined pressing force by d, 13d.

Further, by connecting one end of the wire rope L to the support member 13a, the other end are as wound in the take-up reel R ₃ of the wire rope as shown in Figure 1.

Further, the electric wire 3 connected to the heating wire 3 and the temperature sensor 4 arranged as shown in FIG. 4 through the connectors 3a and 4a.
Although not shown, the electric cord 11 having b and 4b penetrates the machine casing 2 and the hydraulic cylinder 7 and is drawn to the outside.

〔The invention's effect〕

Since the present invention is configured as described above, when the repair device is inserted into the hard synthetic resin pipe and moved by pulling, the pressing members having a plurality of surfaces forming the correcting member are substantially arcuate in the radial direction. A ring in the hard synthetic resin pipe where the ring is reduced to a predetermined diameter, and the ring having the function of detecting a defective portion provided in the repair device comes into contact with the defective portion in the reduced diameter state and the repair device cannot move. In a defective portion such as a flat surface or a flat portion, the plurality of pressing members are heated by a heating wire, and the pressing members are radially expanded by a driving unit to heat and soften the defective portion, and a depression or the like. Expands the inner wall of the tube in parallel, and after the hard synthetic resin tube is hardened by stopping the heating, the plurality of pressing materials are radially reduced in diameter, towed and moved to the next defective portion, Since serial can be repaired sequentially defective portion in the same manner, it is possible to easily repair the defective portion as described above.

Therefore, for example, even if the buried hard synthetic resin pipe is dented or flattened due to loosening of the ground, vibration, etc., the hard synthetic resin pipe can be repaired in the buried state.

Moreover, when the defective member such as a depression or flat in the hard synthetic resin pipe is expanded and repaired by the pressing material, the effect of the diameter expansion action of the correction member is improved by using heat in combination, and an excessive diameter expansion is performed. No force is required, and the burden on the hard synthetic resin pipe itself when expanding the diameter can be reduced, and repairs can be performed easily and effortlessly.

In addition, the front and rear parts of the machine frame that constitutes this repair device are equipped with a wheel mechanism that allows the wheel at the tip of the arm expanded by a spring to roll on the pipe inner wall. The device can be moved smoothly.

[Brief description of drawings]

The drawings show an embodiment of a repair device for a hard synthetic resin pipe according to the present invention. FIG. 1 is an explanatory view for repairing a defective portion of a hard synthetic resin pipe buried by this repair device, and FIG. A side view in which a part of a state in which the pressing material forming the correction member forming the repair device is reduced in diameter is shown in section in FIG.
Fig. 4 is a sectional view taken along line -a ', Fig. 4 is a view showing the inside by removing the protective plate of the pressing material forming the correction member, and Fig. 5 is a method of driving the pressing material to expand and contract in the radial direction. FIG. 6 is a side view in which a slide protrusion forming a drive means is provided on a support shaft, FIG. 6 is a side view in which a part of a state in which a pressing member on which a correction member is formed is expanded is shown in section, and FIG. sectional view taken along line bb ',
8 and 9 are explanatory views for detecting a defective portion of the hard synthetic resin pipe. 1 ... Straightening member, 1a ... Pressing material, 1b ... Protective plate, 1c ... Inclined surface, 2 ... Machine frame, 3 ... Heating wire, 4 ... Temperature sensor, 5 ... Slide protrusion, 5a …… Inclined surface, 6 …… spindle, 7 …… hydraulic cylinder, 7a …… front chamber, 7b …… rear chamber, 7c …… side passage, 7d …… recessed groove, 8 …… hydraulic piston, 9,9 ′ …… Pressure resistant hose, 10 …… Ring, 11 …… Electrical cord, 12,13 …… Wheel mechanism, M …… Repair device, MH …… Manhole, P …… Hard synthetic resin pipe, L …… Wire rope, X: defective part, R ₁ , R ₂ , R ₃ ... take-up reel.

Claims (1)

[Claims] 1. A repair device for towing and moving a hard synthetic resin pipe to correct dents, flatness, and the like. When the repair device is moved, the diameter is reduced to a predetermined diameter in the radial direction. A straightening member formed by arranging a plurality of substantially circular arc-shaped pressing members in a substantially circular shape on a machine frame in a hard synthetic resin pipe that cannot move in a reduced diameter state and forming this straightening member Heating wire provided in each pressing material so as to heat the pressing material when radially expanding the plurality of arc-shaped pressing materials, a temperature sensor provided in the vicinity of the heating wire, and this temperature sensor The heating wire control panel for controlling the heat generation of the heating wire based on the temperature information obtained in, a driving means for driving the pressing member to expand and contract in the radial direction, provided on the outer peripheral portion of the machine frame, hard There is no dent or flatness in the synthetic resin pipe. A wheel mechanism that abuts against a point and has a function of detecting the defective point, and a wheel provided at the front and rear of the machine frame so that the wheel at the tip of the arm expanded by a spring rolls on the inner wall of the hard synthetic resin pipe. A repair device for a hard synthetic resin pipe, which is configured by