JP3749685B2 - Rehabilitation of existing pipes - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rehabilitation method in which, in a rehabilitation operation in which an existing pipe buried in the ground is lined with a rehabilitation pipe made of a thermoplastic resin, the rehabilitation pipe is heated while protecting the rehabilitation pipe from inflow water to the existing pipe.
[0002]
[Prior art]
In general, when an existing pipeline for sewage buried underground is aged, the inner surface of this pipeline is lined with a resin-made rehabilitation pipe to reinforce the pipeline. The outline of the work of rehabilitating underground pipes in the ground by such lining rehabilitation technology is shown in FIGS.
[0003]
<Rehabilitation pipe>
FIG. 5 is a diagram showing a form of the rehabilitation pipe 1 used for lining rehabilitation. The illustrated rehabilitation pipe 1 is made of a thermoplastic resin such as vinyl chloride or high-density polyethylene. The rehabilitation pipe 1 is formed with a hook-like portion 11 on the side surface and the cross-sectional area is reduced as shown in FIG. 6A, but when heated to a predetermined shape memory temperature (for example, 80 ° C.), As shown in 6 (b) to (c), it has the performance of expanding the diameter while expanding the bowl-shaped portion 11 and recovering the shape to a cylindrical body.
[0004]
<Lining process>
FIG. 7 is an explanatory view showing the operation of drawing the rehabilitation pipe 1 into the existing pipe 2. The illustrated existing pipe 2 is buried with a gentle gradient so that the upstream manhole 81 (left side in the figure) communicates with the downstream manhole 82 (right side in the figure).
[0005]
The rehabilitation pipe 1 wound on the drum 83 is carried on the ground near the upstream manhole 81, and a winch 84 is disposed on the ground near the downstream manhole 82. In addition, a guide portion 86 for guiding the wire 85 that pulls the rehabilitation pipe 1 is provided at the lower portion of the downstream manhole 82. The lining operation is started by an operation of first feeding the renovated pipe 1 into the existing pipe 2 while rotating the drum 83. Specifically, a tip tool 87 is attached to the tip of the rehabilitation tube 1, and a wire 85 extending from the winch 84 is locked to the tip tool 87. Then, in a state where the tip of the rehabilitated pipe 1 sent out from the drum 83 is inserted into the existing pipe 2, the rehabilitated pipe 1 is pulled by winding the wire 85 with the winch 84, and the rehabilitated pipe 1 is connected to the existing pipe 2. Pull inside. With this operation, the rehabilitation pipe 1 is laid over the entire length of the existing pipe 2 connecting the upstream manhole 81 and the downstream manhole 82. At this stage, the cross-sectional shape of the rehabilitation pipe 1 is maintained in a reduced diameter state as shown in FIG.
[0006]
FIG. 8 is an explanatory view showing the operation of expanding the drawn-in rehabilitation pipe 1 by heating and bringing it into close contact with the inner surface of the existing pipe 2. A steam generator / pressurizer 91 is disposed on the ground near the upstream manhole 81, and a water / steam separator 92 is disposed on the ground near the downstream manhole 82. An elbow 93 is connected to the rear end of the rehabilitation pipe 1, a hose 94 extending from the steam generator / pressurizer 91 is connected to the elbow 93, and a water / steam separator is attached to a tip 87 attached to the front end of the rehabilitation pipe 1. A hose 95 extending from 92 is connected. A temperature sensor (not shown) is attached to the elbow 93 and the tip tool 87. In this state, high-temperature steam is continuously supplied from the steam generator / pressurizer 91 into the rehabilitation pipe 1 and the steam flows down to the water / steam separator 92, while the rehabilitation pipe 1 is moved from its inside to the shape memory temperature. Until heated. Then, the rehabilitation pipe 1 expands to a shape close to the stored cylindrical body through a cross-sectional shape as shown in FIG. After the rehabilitation pipe 1 is restored in shape in this way, the tip 87 is sealed, and compressed air is sent from the steam generator / pressurizer 91 to the inside of the rehabilitation pipe 1 so that the rehabilitation pipe 1 is pressurized and expanded from the inside. Then, the rehabilitation pipe 1 further expands in diameter and comes into close contact with the inner surface of the existing pipe 2 as shown in FIG. After the rehabilitation pipe 1 is cooled and fixed in this pressurized state, the lining operation of the existing pipe 2 is completed by cutting off the front end portion of the rehabilitation pipe 1 closed by the tip tool 87.
[0007]
[Problems to be solved by the invention]
In the existing pipe 2 that has been deteriorated, it is normal that spring water, rainwater, and the like flow into the existing pipe 2 from a cracked portion of the pipe. When such inflow water wets the rehabilitation pipe 1 that is being heated and expanded in the conventional lining rehabilitation work, the wet part may be cooled and the shape may not be sufficiently recovered. In particular, in the state where the reed-shaped portion 11 of the rehabilitation pipe 1 is facing upward as shown in FIG. 6A, the inflow water is accumulated in this reed-shaped portion 11 and further flows in the tube axis direction. Smooth diameter expansion is inhibited over a wide range.
[0008]
The present invention has been made in view of such circumstances, and in order to smoothly expand the diameter of the rehabilitation pipe in the rehabilitation work for lining the existing pipe by heating and expanding the diameter of the rehabilitation pipe made of thermoplastic resin in the existing pipe. The problem to be solved is to provide a rehabilitation method that protects the rehabilitating pipe being heated from the inflow water.
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the rehabilitation method for an existing pipe according to the present invention includes inserting a rehabilitation pipe made of a thermoplastic resin into the existing pipe in a reduced diameter state, and heat-expanding the rehabilitation pipe to adhere to the inner surface of the existing pipe. In the rehabilitation method for lining existing pipes, a sticking device equipped with a positioning camera capable of remotely monitoring a shielding plate made of a water-resistant thin plate material prior to the work of inserting the rehabilitation pipe into the existing pipe. The shield plate is cross-sectioned through an adhesive adhered to the convex surface of the shield plate while remotely monitoring with a positioning camera the inflow water generation location in the existing tube. By sticking in a substantially circular arc shape, the upper part of the rehabilitation pipe inserted into the existing pipe is covered with the shielding plate, and the inflowing water is allowed to flow in the circumferential direction along the convex surface of the shielding plate, so that the rehabilitation pipe At least the upper half of Characterized in that it prevented from being cooled by the flowing water.
[0011]
According to this invention, since the inflow water into the existing pipe flows in the circumferential direction along the convex surface of the shielding plate, at least the upper half of the rehabilitation pipe is not wetted by the inflow water. Therefore, the rehabilitation pipe is sufficiently heated, recovers its shape well, and comes into close contact with the existing pipe. Although the shielding plate remains sandwiched between the existing pipe and the rehabilitated pipe after the diameter of the rehabilitated pipe, it is made of a thin plate material, which may cause a particular hindrance to the condition after rehabilitation. Absent.
[0013]
And by forming a plurality of concave grooves along the circumferential direction of the existing pipe at appropriate intervals on the convex side surface of the shielding plate, the inflowing water can be smoothly flowed down without being dispersed in the pipe axis direction. Can do.
[0014]
Further, it is preferable that an adhesive made of a water curable resin is applied or pasted on the convex surface of the shielding plate. The adhesive made of a water curable resin exhibits an effect of satisfactorily adhering the interface between the shielding plate and the existing pipe even when water or mud adheres to the inner surface of the existing pipe. As such an adhesive, a polymer system containing a silyl group or an anionic polymerization type one-component moisture-curing elastic adhesive is suitable. In addition, if this adhesive is applied in an appropriate thickness along the circumferential direction or applied in a tape-like form, the same effect as the above-described configuration in which the inflowing water flows down in the circumferential direction by the concave groove Can be obtained.
[0015]
Further, the shielding plate may have an appropriate rebound resilience in the circumferential direction, and may be shaped such that the radius of curvature when no external force is applied is larger than the inner diameter of the existing pipe. According to this configuration, the shielding plate is brought into the existing pipe in a curved state so as to have a radius of curvature smaller than the inner diameter of the existing pipe, and is released at a predetermined position so that the shielding board is elasticized by itself. Extends and adheres well to existing pipes.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. About the rehabilitation pipe | tube, it is the same as the content demonstrated by FIGS. 5-8 in description of the said prior art.
[0017]
<Shielding plate>
First, the structural example of the shielding board utilized for the rehabilitation method of the existing pipe | tube of this invention is shown in FIG. The shielding plate 3 is formed of a thin synthetic resin plate or metal plate having moderate flexibility and rebound resilience. The shielding plate 3 has an outer shape obtained by cutting a part of a cylindrical surface, and the cross section in the width direction is substantially arc-shaped. The curvature radius in the width direction (circumferential direction of the arc) is formed so as to be slightly larger than the inner diameter of the existing pipe 2 (see FIGS. 2 to 4) to be rehabilitated in the state where no external force is applied.
[0018]
On the convex surface of the shielding plate 3, elongated adhesive tapes 31 are affixed at appropriate intervals along the circumferential direction. This adhesive tape 31 is obtained by attaching an adhesive made of, for example, a polymer-based water-curable resin to the surface of a base material having an appropriate thickness. Thereby, a concave groove 32 extending in the circumferential direction is formed between the adjacent adhesive tapes 31.
[0019]
Such a shielding plate 3 is firmly attached to the existing tube 2 by the curing of the adhesive made of a water curable resin when the convex surface is pressed toward the inner surface of the existing tube 2. If the entire surface of the convex side is in close contact with the existing pipe 2, the shielding plate 3 is easily peeled off by the water pressure of the inflow water, but the circumferential concave groove 32 is formed between the adjacent adhesive tapes 31. This concave groove 32 allows the inflowing water to flow smoothly and excludes it downward, and stabilizes the sticking state.
[0020]
The shielding plate 3 according to the present invention is not limited to this embodiment. For example, the shielding plate 3 can be formed by curving a plate material whose cross section in the axial direction (cylindrical generatrix direction) is corrugated. .
[0021]
<Attaching device>
The shielding plate 3 as described above is held in a sticking device 5 as shown in FIGS. 2 to 3, for example, and carried into the existing pipe 2 and stuck at a predetermined position.
[0022]
The illustrated sticking device 5 is configured such that the pressing plate 51 for holding the shielding plate 3 is attached to the carriage 52 via the lifting support means and the angle adjustment means provided on the carriage 52 that can move in the existing pipe 2. On the other hand, it is held so that it can be raised and lowered and tilted up and down along the inner peripheral direction of the existing pipe 2.
[0023]
The carriage 52 is formed so that the bottom part is along the inner surface of the existing pipe 2. Near the four corners of the bottom portion, substantially hemispherical leg portions 53 made of a material such as resin or metal that easily slips on the inner surface of the existing pipe 2 are attached. The carriage 52 moves to the location where the inflow water is generated by traction guidance using a wire or the like, or through appropriate self-propelled means.
[0024]
A pair of support members 54 are erected in front of and behind the carriage 52. A positioning camera 77 is attached in the vicinity of one of the front and rear support members 54. The operator remotely monitors the upper inner surface of the existing pipe 2 with the camera 77 to adjust the position of the carriage 52 and the raising / lowering direction of the pressing plate 51 so that the pressing plate 51 faces the location where the inflow water is generated. be able to.
[0025]
A shaft member 55 and a bearing member 56 are attached to the upper portions of the front and rear support members 54 so that the front and rear shaft centers coincide with each other, and a rotation axis parallel to the traveling direction of the carriage 52 is formed by these. . A base portion 57 is attached to the rotating shaft in a suspended state. The base portion 57 is formed by a swinging member 58 that is attached to each of the front and rear shaft members 55 and a pair of left and right connecting rods 59 that connect the front and rear swinging members 58, with the rotation shaft as the center. So that it can tilt to the left and right with respect to the direction of travel. A motor 60 for changing the tilt angle of the base portion 57 is attached to one end of the front and rear of the carriage 52, and a drive shaft of the motor 60 is coupled to one shaft member 55. The motor 60 is artificially controlled from the outside of the existing pipe 2. The front and rear support members 54, the base portion 57, and the motor 60 constitute angle adjusting means.
[0026]
A pantograph-type registering 61 is attached to the front and rear of the base portion 57, respectively. The registering 61 is a mechanism conventionally used for train pantographs, telescopic magic hands, and the like, and has a plurality of link arms 62 that are hingedly connected to each other in a rhombus shape. When the interval 63 is enlarged or reduced, the crossing angle of the link arm 62 changes and the entire length expands and contracts. The registering 61 used in the sticking device 5 is provided so as to form a pair on the left and right of the front and rear of the base portion 57 with the extension direction facing upward. Each base end portion 63 is integrally connected to the left and right via a base end connecting member 64 that is elongated in the width direction of the base portion 57. Each base end connection member 64 has a pair of left and right connection rod insertion holes 65, and right and left connection rods 59 that form the base portion 57 are inserted through these connection rod insertion holes 65, respectively.
[0027]
Further, a female screw hole 67 is formed in the center portion in the width direction of the base end connecting member 64, and a guide bolt 68 provided in the center in the width direction of the base portion 57 is screwed into the female screw hole 67. ing. The guide bolt 68 is disposed between the front and rear rocking members 58 that form the base portion 57, and receives the driving force of the motor 71 that is mounted substantially at the center of the base portion 57 via the gears 69 and 70. To rotate. Also, in the vicinity of both ends of the guide bolt 68. Male threads corresponding to the female threads formed on the proximal end connecting member 64 are formed. The female screw and the male screw are a left screw 72 and a right screw 73, respectively, with respect to the base end portion 63 forming a pair. Therefore, when the guide bolt rotates, the base end connecting member 64 screwed to the guide bolt moves in the opposite directions so as to expand and contract the interval between the base end portions 63 of the respective registrations 61. The raising / lowering support means is formed by the registering 61, the base end connecting member 64, the guide bolt 68 and the motor 71.
[0028]
A cover member 74 formed to cover the left and right registering 61 is attached to the upper end of the registering 61. On the side surface of the cover member 74, a pressing plate support arm 75 protruding obliquely upward and leftward with respect to the traveling direction of the carriage 52 is attached. Both ends of the pressing plate support arm 75 are hinged to the side surface of the cover member 74 and the vicinity of the four corners of the back surface of the pressing plate 51, respectively.
[0029]
The pressing plate 51 is formed of a metal plate or a resin plate having moderate bending elasticity, and is held by the pressing plate support arm 75 in a curved state so that the surface side is convex. The pressing plate 51 is shaped so that the bending radius in the normal state is smaller than the inner radius of the existing pipe 2. Appropriate holding means is provided on the surface of the pressing plate 51 so that the concave surface of the shielding plate 3 can be detachably held.
[0030]
When the elevating support means is operated to raise the cover member 74, the cover member 74 presses the pressing plate 51 against the inner surface of the existing pipe 2 via the pressing plate support arm 75. Then, the pressing plate 51 first comes into contact with the inner surface of the existing pipe 2 from the vicinity of the center thereof. When the cover member 74 is further raised, the pressing plate support arms 75 that have received the reaction force from the inner surface of the existing pipe 2 are rotated so that the angles of the pressing plates 51 become horizontal, and the radius of curvature of the pressing plate 51 is increased. As a result, the pressing plate 51 is gradually pressed against the inner surface of the existing pipe 2 from the vicinity of the center to both side edges.
[0031]
Further, when the elevating support means operates in the opposite direction and the cover member 74 descends, the pressing plate 51 gradually separates from the existing pipe 2 toward the center while reducing the curvature pipe diameter by its own elasticity. By such a lifting and lowering operation of the pressing plate 51, the shielding plate 3 having an adhesive on the convex surface can be adhered to the inner surface of the existing pipe 2 with high accuracy.
[0032]
If the shielding plate 3 itself has a curved state having a radius of curvature larger than the inner diameter of the existing pipe 2, the shielding plate 3 will extend by its own elasticity even after being released from the pressure by the pressing plate 51. Therefore, the sticking state with respect to the existing pipe 2 becomes favorable.
[0033]
The sticking device 5 is provided with posture fixing means for fixing the carriage 52 when the pressing plate 51 is pressed against the inner surface of the existing pipe 2. In the posture restraining means, when the inflow water is generated at an obliquely upper position rather than immediately above the existing pipe 2, the carriage 52 is moved within the existing pipe 2 by a reaction force when the pressing plate 51 is pressed obliquely upward. It is provided to prevent an attempt to tilt.
[0034]
The posture restraining means is formed by a telescopic member 78 erected before and after the carriage 52. The expansion and contraction member 78 uses a cylinder piston mechanism that expands and contracts by a fluid pressure such as air pressure, gas pressure, and hydraulic pressure, for example, and is provided so that two expansion and contraction members 78 are paired on the left and right in each front and rear part of the carriage 52. It has been. The cylinder portion 79 of the telescopic member 78 is fixed to the carriage 52 in a stationary state, and the piston rod portion 80 protrudes and retracts from the cylinder portion 79 in the vertical direction. An abutting member 81 is attached to the upper end of the piston rod portion 80 so as to integrally connect the piston rod portions 80 that form a pair on the left and right. The surface of the abutting member 81 is formed so as to exhibit an appropriate frictional force with the inner surface of the existing pipe 2. After the carriage 52 is positioned at a predetermined position via the positioning camera 77 described above, the telescopic member 78 is extended by an external operation, and the abutting member 81 is abutted against the inner surface of the existing pipe 2. Then, the cart 52 is fixed in a stretched state in the existing pipe 2, and the work of attaching the shielding plate 3 obliquely above the existing pipe 2 can be performed with high accuracy.
[0035]
In addition, the sticking apparatus 5 is not limited to this embodiment. For example, it is possible to use a sticking device provided with a substantially cylindrical pressing means that expands and contracts in the radial direction by injecting and discharging air and gas.
[0036]
<Protection of rehabilitation pipe>
When sticking of the shielding plate 3 is completed by the sticking device 5 as described above, the rehabilitation pipe 1 is inserted into the existing pipe 2 as shown in FIGS. At this time, as shown in FIG. 4, the inflow water into the existing pipe 2 flows in the circumferential direction along the concave groove 32 formed on the convex surface of the shielding plate 3, and the pipe axis direction of the existing pipe 2 Is eliminated with little dispersion. For this reason, at least the upper half part of the rehabilitation pipe | tube 1 is protected from getting wet with inflow water. Thereby, the rehabilitation pipe | tube 1 is fully heated, a shape recovery is carried out favorably, and it adheres to the existing pipe | tube 2.
[0037]
In addition, the inflow water removed downward from both side edges of the shielding plate 3 is accumulated at the bottom of the existing pipe 2 and wets and cools the lower part of the rehabilitation pipe 1. However, since the lower part of the rehabilitation pipe 1 is originally formed so as to be convex outward, even if it is cooled to some extent, it will not be affected so much and will recover its shape smoothly. On the other hand, since the bowl-shaped part 11 located in the upper half part of the rehabilitation pipe 1 is originally formed so as to be concave toward the outside, protecting this part from the inflowing water is the one at the time of diameter expansion. It is extremely important for improving efficiency and accuracy. In this respect, the rehabilitation method of the present invention greatly contributes to workability.
[0038]
After the rehabilitation pipe 1 is expanded in this way, the shielding plate 3 remains sandwiched between the existing pipe 2 and the rehabilitation pipe 1. However, since the shielding plate 3 is formed of a thin plate material, it does not particularly hinder the state after rehabilitation.
[0039]
【The invention's effect】
As described above, the method for rehabilitating an existing pipe according to the present invention attaches a shielding plate to a location where inflow water is generated prior to the work of inserting the rehabilitating pipe into the existing pipe, and the shielding plate is used above the rehabilitation pipe. Is used to protect the rehabilitation pipe during heating and diameter expansion. According to this invention, since the inflow water is removed in the circumferential direction along the convex surface of the shielding plate, at least the upper half of the rehabilitating pipe is sufficiently heated to recover its shape well and adhere to the existing pipe. . As a result, the workability of the lining rehabilitation work is improved.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a shielding plate of the present invention.
FIG. 2 is an explanatory view showing a cross-sectional configuration in the tube axis direction of the sticking device used in the present invention.
3 is an explanatory view showing a cross-sectional configuration in the pipe radial direction of the sticking device shown in FIG. 2, wherein (a) shows a state in which the pressing plate is raised, and (b) shows a state in which the pressing plate is lowered. .
FIG. 4 is a pipe radial direction sectional view for explaining the operation of the existing pipe rehabilitation method according to the present invention.
FIG. 5 is a partial perspective view showing an example of a rehabilitation pipe used in the present invention.
6 is an explanatory view showing a shape change when the rehabilitation pipe of FIG. 5 is heated and expanded in an existing pipe. FIG.
FIG. 7 is an explanatory diagram of an operation of drawing a rehabilitation pipe into an existing pipe.
FIG. 8 is an explanatory diagram of an operation for expanding the diameter of a rehabilitated pipe within an existing pipe.
[Explanation of symbols]
1 Rehabilitated pipe 2 Existing pipe 3 Shield plate 31 Adhesive tape (adhesive)
32 groove

Claims (3)

In the rehabilitation method of inserting a rehabilitation pipe made of a thermoplastic resin into an existing pipe in a reduced diameter state, and lining the existing pipe by heating and expanding the rehabilitation pipe and closely contacting the inner surface of the existing pipe,
Prior to the work of inserting the rehabilitation pipe into the existing pipe, a shielding plate made of a water-resistant thin plate material is carried into the existing pipe using a sticking device equipped with a remote monitoring positioning camera. While remotely monitoring with a positioning camera at the location where the inflow water is generated, the above-mentioned shielding plate is attached in an approximately circular arc shape with an adhesive adhered to the convex surface of the above-mentioned shielding plate. The upper part of the rehabilitation pipe inserted into the cover is covered with the shielding plate, and the inflowing water is allowed to flow in the circumferential direction along the convex surface of the shielding plate, so that at least the upper half of the rehabilitation pipe is cooled by the inflowing water. A method for rehabilitating existing pipes, characterized by preventing The method for rehabilitating an existing pipe according to claim 1, wherein a plurality of concave grooves along the circumferential direction of the existing pipe are formed at appropriate intervals on the convex surface of the shielding plate. The existing shield according to claim 1, wherein the shielding plate has an appropriate rebound resilience with respect to the circumferential direction, and is shaped so that a radius of curvature when no external force is applied is larger than an inner diameter of the existing pipe. How to rehabilitate tubes .

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