JP3468539B2 - Pipeline repair method and its repair device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a repair work method for pressing and holding a repair material on the inner surface side of a pipeline when repairing a pipeline such as a drainage pipe, and a pipeline repair device used for this repair work. It is about.

[0002]

2. Description of the Related Art In repairing a pipeline such as a drainage pipe, a repair material impregnated with a synthetic resin whose curing is accelerated by heating, such as a thermosetting synthetic resin, is pressed and held along the inner surface of the pipeline. Then, there is a repairing method in which the thermosetting synthetic resin is hardened to repair damage to the pipeline or the like.

The curing time of the thermosetting synthetic resin or the like used in such repair method is generally influenced by the temperature of the synthetic resin.

In such a repairing method, the temperature in the pipe is generally lower than the temperature at which the thermosetting synthetic resin or the like is rapidly cured, so that, for example, JP-A-2-25
As shown in Japanese Patent No. 2529, it has been proposed to uniformly heat the entire circumference of the pipeline using an electric heater or the like.

[0005]

By the way, in the pipeline in which such repair work is carried out, water flowing through the pipeline or water due to dew condensation in the pipeline collects at the bottom of the pipeline, and the bottom of the pipeline is It is often wet compared to the ceiling of the pipeline.

In the repair work of such a pipeline, if heating is uniformly performed in the circumferential direction of the pipeline as in the conventional case, the temperature of the synthetic resin such as the ceiling portion of the pipeline rises relatively easily. Since the heat of vaporization is taken away by water at the bottom, the temperature rise becomes slow.

Therefore, the curing time of the synthetic resin of the repair material is varied, and it is not preferable for forming a sound repair material which is uniformly cured over the entire circumference in the circumferential direction of the conduit.

The present invention has been made in view of the above circumstances. In the repair work of the pipeline, the synthetic resin is heated to accelerate its curing, and the entire circumference of the pipeline in the circumferential direction is improved. The purpose is to form a sound repair structure comprising a synthetic resin that is homogeneously cured throughout.

[0009]

In order to achieve this object, the invention according to claim 1 heats the outer circumference of the expansion part of a repair device having an expansion part that is expandable in the radial direction of the pipeline. After mounting a repair material impregnated with a synthetic resin whose curing is accelerated by, and arranging the repair device inside the pipeline, the expansion section is expanded to press the repair material to the inner surface side of the pipeline. In the pipeline repair method in which the repair device heats the repair material, the repair device is configured such that the timing of curing the synthetic resin
By the heating means installed to eliminate the variation of
Blow out heated air or face bottom
The pipe repair method is characterized in that a heat transfer heater is installed only in the expansion part to supply more heat to the portion of the repair material located at the bottom of the pipe than to other parts.

[0010]

According to the first aspect of the present invention, the repair device supplies a larger amount of heat to the portion of the repair material located at the bottom of the pipeline than the other portions, so that the bottom of the pipeline is wet with water or the like. Even if there is a heat loss as vaporization heat, the temperature rise of the synthetic resin is less delayed than that of other parts, and the heating impregnated in the repair material in the circumferential direction of the pipeline accelerates the curing of the synthetic resin. Variations in timing are improved.

Therefore, it is possible to form a sound repair structure having a uniformly cured synthetic resin while heating the synthetic resin to accelerate its curing.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in the drawings. First, the first embodiment shown in FIGS. 1 to 4 will be described.

The repair device 1 of this embodiment has a cylindrical main body 2.

The main body 2 is made of a so-called punch metal made of a steel plate having a large number of through holes 2a formed therein.

Inside the main body 2, an inner cylinder 5 is installed concentrically across the end plates 4 installed at both ends of the main body 2, with the central axis O of the repair device 1 being common. A cylindrical empty chamber 6 is formed between the inner cylinder 5 and the main body 2, and an inner peripheral side of the inner cylinder 5 is a liquid flow path 7 flowing in the pipe (see FIGS. 1 and 3).

On the outer peripheral side of the main body 2, a flexible film 8 formed of a sheet-like flexible material such as rubber in a substantially cylindrical shape.
, And both ends of the flexible membrane 8 are airtightly attached to the ends of the main body 2 by the retaining rings 11, and a cylindrical expansion chamber R is formed inside the flexible membrane 8. The surface of the flexible film 8 outside the R is an expanded portion B.

In this embodiment, since the empty chamber 6 communicates with the expansion chamber R via the large number of through holes 2a, it is spatially defined as a part of the expansion chamber R. Have a function.

An air supply hole 4a is formed on one of the end plates 4 in the vacant chamber 6, and a blow-out pipe 12 containing an electric heater (not shown) is installed in the air supply hole 4a. There is.

The electric heater used in this embodiment is a so-called instantaneous warm air heater, and by applying a predetermined voltage while supplying a predetermined amount of air to the electric heater,
The hot air having an appropriate temperature is instantly generated in the blow-out pipe 12.

In this embodiment, stays 9a extending outward and downward are fixed to the end plates 4 on both sides, and wheels 9b rotatably rotatably supported at the lower ends of these stays 9a. Two are provided for each (see FIG. 2).

The air compressor 1 is installed in the air supply hole 4a.
4 is connected to an air supply hose 15 extending from the discharge port to supply compressed air into the blow-out pipe 12, and at the same time, an electric heater built in the blow-out pipe 12 has a power supply device 16 such as a generator. From the voltage regulator 17 to the power supply circuit 18 to supply power.

The voltage adjusting device 17 is an adjusting means for adjusting the amount of heat generated by the electric heater, and by adjusting the power supply voltage supplied to the electric heater, the temperature of the compressed air can be adjusted appropriately.

As shown in FIGS. 1 and 3 and 4, the blow-out pipe 12 is installed so as to extend in the axial direction of the repair device 1 in the lower portion of the empty chamber 6 below the inner cylinder 5, The blow-out pipe 12 is located closer to the bottom 31a of the conduit 31 than the central axis O.

The outlet 12a of the outlet pipe 12,
A large number of 12b are installed at a constant interval over substantially the entire length of the blow-out pipe 12, and are opened toward the bottom 31a of the pipe line 31.

Therefore, the hot air blown out from the blow-out pipe 12 passes through a large number of through holes 2a formed in the main body 2 without being hindered by the inner cylinder 5, and is positioned corresponding to the bottom portion 31a of the pipe line 31. The heating area S of the flexible film 8 is intensively heated by being sprayed on the inner surface side of the flexible film 8.

In this embodiment, the air outlets 12a, 12
b is provided with a first outlet 12a opened right below and a second outlet 12b opened slightly obliquely downward (see FIG. 4).

This means that the heating region S, which is heated by the hot air blown from the blow-out pipe 12, is located not only at the position M immediately below the blow-out pipe 12 but also at the center thereof, and the central axis O of the repairing device 1
This is because the heating region S is expanded in the circumferential direction over the region from the positions P ₁ to P ₂ which is in the range of about 60 degrees around it. Then, the opening diameters and the directing directions of the outlets 12a and 12b are set so that the temperature distribution in the heating region S becomes appropriate.

Further, since the blow-out pipe 12 extends over substantially the entire length in the axial direction (longitudinal direction) of the repair device 1 as shown, the heating region S formed by the hot air from the blow-out pipe 12
The length in the axial direction of is approximately equivalent to the axial length of the repair device 1.

The hot air reaching the expansion chamber R from the blow-out pipe 12 through the through hole 2a of the main body 2 transfers a large amount of heat to the heating region S on the inner surface of the flexible film 8, and then the arrow in FIG. As shown in (3), the inside of the expansion chamber R or the inside of the main body 2 rises, but at this time, heat is also transferred to the inner surface of each part of the flexible film 8.

In this heat transfer, the amount of hot air contacting per unit area of the flexible film 8 is small, so that the amount of heat supplied from the bottom portion 31a is small.

After this, the hot air reaches the upper part of the expansion chamber R and also heats the ceiling part 31b of the conduit 31.

The flexible membrane 8 is bulged outward in the radial direction of the conduit 31 by supplying the heated air to the expansion chamber R.

The overall path of the air supplied to the expansion chamber R of the repair device 1 is as follows (see FIG. 1).

The air sucked from the atmosphere and pressurized by the air compressor 14 passes through the first variable throttle 21a and the first pressure gauge 22, and is then supplied to the repair device 1 through the air supply hose 15. To be done. The air that has reached the repair device 1 is supplied into the blow-out pipe 12 through the air supply hole 4a.

In the blow-out pipe 12, the supplied air is heated by the built-in electric heater as described above and instantly becomes hot air of a required temperature.

The air that has become hot air is blown out from the outlets 12a and 12b of the blowout pipe 12, and is supplied into the expansion chamber R through the through hole 2a of the main body. At this time, the outlet 12
Since the hot air from a and 12b has a certain flow velocity, after passing through the through hole 2a, it is blown to the heating region S on the inner surface of the flexible film 8 located on the bottom 31a of the conduit 31.
The flexible membrane 8 at the relevant portion is heated from the inner surface side to supply heat to the repair material 33 mounted on the outer side thereof, and at the same time, the expansion chamber R
Is expanded to perform the repair operation as the repair device 1.

The hot air supplied to the expansion chamber R is supplied to the bottom portion 3
After heating 1a, it rises and is discharged to the outside of the device through the exhaust hose 24 from the exhaust hole 23 that opens in the upper part of the expansion chamber R.

The other end of the exhaust hose 24 is discharged into the atmosphere through the second variable throttle 21b.

In the figure, 26 is a second pressure gauge for measuring the air pressure in the chamber 6, 27 is a temperature sensor such as a thermistor, which indicates the temperature of the air discharged from the expansion chamber R and flowing in the exhaust hose 24. It is something to measure.

The repair work of the conduit 31 such as the drain pipe using the repair device 1 thus constructed is carried out as follows.

In FIG. 2, reference numeral 31 indicates a pipe line, 32 indicates a manhole, and the pipe line 31 has a crack 31c.

First, while the expansion chamber R of the repair device 1 is in the contracted state on the surface of the earth, the following repair material 33 is wound around the outer peripheral surface of the flexible film 8 which becomes the expansion portion B and is attached.

That is, the repair material 33 is obtained by impregnating a glass fiber or plastic fiber base material formed in a sheet shape with a liquid epoxy resin or unsaturated polyester resin as a synthetic resin whose curing is accelerated by heating. It was made.

The repair device 1 thus equipped with the repair material 33 is arranged at a position facing the crack 31a inside the conduit 31. At this time, the repair device 1 is arranged such that the outlets 12a and 12b of the outlet pipe 12 are oriented toward the bottom 31a side of the conduit 31.

The arranging operation of the repairing device 1 is performed by pulling the positioning ropes 34 from both sides in the manholes 32 installed on both sides of the pipe line 31 in which the cracks 31c exist.

After the repair device 1 is placed at the required position,
The expansion chamber R of the repair device 1 is operated by operating the air compressor 14.
Supply compressed air inside.

In this case, the compressed air supplied from the air compressor 14 is read by reading the first and second pressure gauges 22 and 26 and operating the variable throttles 21a and 21b as appropriate to adjust the desired pressure. Supply by air pressure.

The repair device 1 is supplied with the supply of compressed air.
Expands in the radial direction of the conduit 31, and the repair material 33 is pressed onto the inner peripheral surface of the conduit 31 as shown in FIGS. 1 and 3.

At this time, the repair material 33 is in a state in which the repair material 33 is in close contact with the inside of the crack 31c .

In this embodiment, a large amount of compressed air for pressing the repair material 33 onto the inner surface of the conduit 31 is heated in the blow-out pipe 12 by the electric heater as described above. Is supplied into the expansion chamber R through the through hole 2a.

As a result, as described above, the hot air flows into the conduit 3
Since a large amount is blown to the heating region S inside the flexible film 8 on the side of the bottom portion 31a of No. 1, a large amount is blown to the bottom portion 31a of the conduit 31 as shown by the shaded portion in the graph of FIG. The heat quantity Q can be concentratedly supplied.

Therefore, even if a little water is present at the bottom 31a of the conduit 31 and the heat of vaporization is taken away, the synthetic resin of the repair material 33 can be heated as usual, and the repair material 33 can be heated more than before. Can be uniformly cured.

After this, the exhaust gas formed in the upper part of the expansion chamber R
It is guided from the hole 23 through the exhaust hose 24 to the outside of the repair device 1 and discharged into the atmosphere.

Thus, in this embodiment,
Pipe line 3 has a highly rigid repair structure that has been cured in a tubular shape with a synthetic resin that has been cured more uniformly than before and that is sound and has the required strength.
1 is formed in close contact with the inner surface of the pipe 1, and the crack 3 of the pipe line 31 is formed.
The part where 1c exists is repaired.

When the curing of the repair material 33 is completed, the blow-out pipe 1
The electricity to the electric heater in 2 and the supply of air are stopped, and the air in the expansion chamber R of the repair device 1 is discharged.

As a result, the flexible membrane 8 of the repair device 1 which has been inflated under a predetermined pressure contracts, and the positioning rope 3
By pulling 4, the repair device 1 can be pulled out from the pipe line 31 into the manhole 32 to complete the repair work.

Incidentally, in the blow-out pipe 12, the second blow-out port 12b is provided to enlarge the heating region S because the repair device 1 equipped with the repair material 33 when the repair device 1 is expanded has the conduit 31. When it first adheres to one side, the repair device 1 rotates in the circumferential direction with respect to the pipe line 31 due to the expansion of the repair device 1 around this attached portion, and the positions of the outlets 12a and 12b are set to the pipe line 31. This is also because it is possible that the bottom 31a may be displaced.

Next, a second embodiment will be described with reference to FIGS.

The second embodiment is different from the first embodiment only in the blowout pipe, and is the same in the other respects.

In the following, only matters related to the blow-out pipe will be described, and the same points will be given the same reference numerals in the drawings and the description thereof will be omitted.

That is, in this second embodiment, the blow-out pipe 37 is formed in a substantially Y shape.

Then, the branch pipe 37a is installed in the chamber 6 below the central axis O and the inner cylinder 5 so that the branch pipe 37a extends along the axial direction of the repair device 1. As in the previous embodiment, a large number of outlets 37b are formed in the branch pipes 37a downwards at regular intervals over the entire length.

Blow-out port 3 formed in these branch pipes 37a
7b, as shown in FIG.
A heating region S that is opened toward 1a and receives a relatively large amount of heat with a constant width on the bottom surface 31a side of the conduit 31 by the hot air blown out from these outlets 37b.
Is formed, and the length of the heating region S in the axial direction is approximately equivalent to the length of the repair device 1.

Therefore, also in the second embodiment having the blow-out pipe 37, the same effect as that of the first embodiment can be obtained.

Incidentally, in this embodiment, the branch pipe 3
The blowout pipe 37 having 7a is used in order to further expand the heating region S in the circumferential direction without forming the second blowout port 12b.

Next, a third embodiment will be described with reference to FIGS.

In this third embodiment, the curing of the synthetic resin impregnated in the repair material 33, which is accelerated by heating and promotes curing, is promoted by using the electric heater H formed in a sheet shape. The supplied air is supplied with the repair material 33 through the conduit 31.
It is dedicated to applying a pressing force to the inner surface of.

Also in the following description of this embodiment, only the differences from the first embodiment will be described, and the common portions will be assigned the same reference numerals as those described above and the description thereof will be omitted.

That is, in the repair device 1 of this embodiment, the through hole 2a and the vacant chamber 6 are not formed, and the flexible film 8 is installed outside the main body 2 having no through hole 2a. Only the expansion chamber R is formed.

An air supply port 41 is formed in the main body 2, and a hose 42 extending from the air compressor 14 is connected to the air supply port 41. No mouth or exhaust hose is installed.

Therefore, in the repair device 1 of this embodiment, the repair material 33 mounted on the outside of the expansion chamber R by confining and storing the air supplied from the hose 42 to the expansion chamber R. Is pressed against the inner surface side of the pipe line 31, and the air is discharged from the expansion chamber R through the hose 42.

The repair work of the conduit 31 using the repair device 1 thus constructed is carried out as follows.

First, a sheet-like electric heater H is partially attached to a portion of the outer peripheral surface of the expansion film 8 of the repair device 1 corresponding to the bottom 31a side of the conduit 31.

The electric heater H is mounted on a film 43 made of synthetic resin such as polyvinyl chloride and used for peeling off the repair material 33 after curing, and the film 43 is placed on the outside of the expanded portion B. Do by wrapping.

The electric heater H is, for example, a light-emitting surface heater (trade name, manufactured by Idemitsu Kosan Co., Ltd.), which is a sheet-shaped composite of polymer and conductive powder having a thickness of about 0.7 mm. It has flexibility.

The electric heater H is used in the power supply device 1
6 is connected by a power supply circuit 18, and heat is appropriately generated by the electric power supplied from the power supply device 16.

As described above, the sheet-shaped repair material 33 is wound around and mounted on the outer side of the film 43 of the repair device 1 to which the electric heater H is mounted.

The repair device 1 thus equipped with the repair material 33 is positioned so as to face the crack 1c in the conduit 31, and the heater H is arranged so as to face the bottom 31a of the conduit 31. Supply compressed air to.

Along with this, the repair device 1 has a conduit 31.
In the radial direction, the length around the outer circumference of the expansion film 11 increases, and as the expansion film 8 expands, the wound film 43 and the repair material 33 are unwound. The repair material 33 is pressed against the inner surface of the conduit 31 (see FIG. 8).

In this state, the electric heater H is located in a portion facing the bottom 31a of the conduit 31, and intensively heats the repair material 33 in a portion located immediately below the electric heater H to cause the heating region S to be heated. It functions similarly to.

That is, even in a situation in which some water is present at the bottom 31a of the conduit 31 and the heat of vaporization is taken away, the repair material 3
The synthetic resin impregnated in 3 can be heated in the same manner as the surroundings, and the repair material 33 can be hardened more uniformly than ever before over the entire circumference in the circumferential direction.

When the curing of the repair material 33 is wholly completed,
The energization of the electric heater H is stopped, and the air in the expansion chamber R of the repair device 1 is discharged.

As a result, the expansion film 8 of the repair device 1 which has been in an expanded state at a predetermined pressure contracts.

The expansion film 8 is contracted so as to be separated at the boundary surface between the film 43 and the repair material 33.
Since the peeling force does not act on the repair material 33 attached to the inner surface of 1, the electric heater H does not impair the repair structure. If the electric heater H is attached and held to the repair device 1 together with the film 43, the positioning rope By pulling 34, the repair device 1 and the pipe 31 can be pulled out into the manhole 32, and the repair work can be completed.

Also in the third embodiment, as described above, the electric heater H supplies a larger amount of heat to the portion of the repair material 33 corresponding to the bottom portion 31a of the pipe 31 than the other portions. Even if some water is present on the bottom portion 31a of 31, the curing time is unlikely to vary, and a sound repair structure in which the thermosetting synthetic resin is uniformly cured is formed over the entire circumference in the circumferential direction of the conduit 31. You can

[0086]

As described above, according to the invention described in claim 1, since the repair device supplies a larger amount of heat to the portion of the repair material located at the bottom of the conduit than the other parts, the bottom of the conduit is Even if heat is generated as heat of vaporization due to being wet with water, the temperature rise of the synthetic resin is less delayed than that of other parts, and the heat is impregnated in the repair material in the circumferential direction of the pipeline to cure it. The variation in the curing time of the synthetic resin, which promotes the deterioration, is improved.

Therefore, it is possible to form a sound repair structure having a uniformly cured synthetic resin while heating the synthetic resin to accelerate its curing.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a repair device according to a first embodiment.

FIG. 2 is an explanatory diagram of a repair work using the first embodiment.

3 is a cross-sectional view taken along line XX of FIG.

FIG. 4 is an explanatory view of a heating state at the bottom of the pipeline by the repair device according to the first embodiment.

FIG. 5 is a horizontal sectional view of the repair device according to the second embodiment.

6 is an explanatory view of a heating state at the bottom of the pipeline in a cross section taken along line YY of FIG.

FIG. 7 is a vertical sectional view of a repair device according to a third embodiment.

8 is a cross-sectional view taken along the line ZZ of FIG.

[Explanation of symbols]

B expansion part 1 Repair device 12 blow-out pipe 12a First outlet 12b Second outlet 31 pipeline 31a bottom 33 Repair material

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroaki Shinohara 1-18-7 Senriyama Bamboo Garden Suita City, Osaka Prefecture (56) References Fukuihei 4-44592 (JP, U) (58) Fields investigated (Int .Cl. ⁷ , DB name) F16L 51/00-58/18 B29C 63/00-65/82 E03F 1/00-11/00

Claims (4)

(57) [Claims] 1. A repairing device, which is provided with an expanding portion that is expandable in the radial direction of the conduit, is fitted with a repair material impregnated with a synthetic resin whose curing is accelerated by heating, on the outer periphery of the expanding portion. After arranging the repair device inside, in the pipeline repair method in which the repair device heats the repair material while inflating the expansion part to press the repair material to the inner surface side of the pipeline, the repair device is Eliminates variations in the curing time of synthetic resins
The heating air is directed downward by the heating means installed to
Heat transfer to the expansion part corresponding to the bottom part
A pipeline repair method, characterized in that a heater is installed to supply more heat to the portion of the repair material located at the bottom of the pipeline than to other parts. 2. A swelling portion that is swellable in the radial direction of the conduit is provided, and a repair material impregnated with a synthetic resin whose curing is accelerated by heating is attached to the outer periphery of a flexible film forming this swelling portion. In a repair device for pipeline repair, a blowout pipe having a blowout opening that opens downward is installed inside the expansion section, and heating air is supplied to the expansion section through the blowout tube. The expansion member is expanded by the pressure of the heated air from the outlet, and the heating air from the outlet is blown downward to blow on the flexible film located at the bottom of the pipeline, and the repair material is attached to the outer peripheral side of the flexible film. A repairing device characterized by heating an object. 3. The repair device according to claim 2, wherein the blow-out pipe is installed on the bottom side of the central axis of the repair device. 4. The repair device according to claim 2 or 3, wherein the blow-out pipe is formed in a bifurcated shape having a branch pipe that is substantially parallel and extends in an axial direction of the repair device.