JP2678133B2 - Pipe lining method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe lining method for repairing a pipe by lining the inner peripheral surface of the pipe.

[0002]

2. Description of the Related Art When a pipeline such as a sewer pipe buried in the ground is deteriorated, the pipeline is repaired by lining the inner surface of the pipeline without excavating the pipeline from the ground. The pipe lining method is known.

In the above-mentioned pipe lining method, for example, a flexible pipe lining material impregnated with a thermosetting resin is inserted into the pipe line while being inverted by hydraulic pressure, and this is pressed against the inner peripheral surface of the pipe line. , The water filled in the pipe lining material is heated by steam or the like into hot water, and the pipe lining material is heated with this hot water to cure the thermosetting resin impregnated in the pipe lining material. This is a method of lining the surface with a cured pipe lining material.

However, in the above construction method, since it is necessary to heat all the water filled in the pipe lining material that is inserted in the pipe line upside down to turn it into hot water, especially when the pipe line has a large diameter or length. If it is long, it is necessary to heat a large amount of water, and there is a problem that the heating and circulation equipment such as a boiler and a hot water pump becomes large in size, cost increases, and construction time becomes long.

Therefore, as shown in FIG. 5, the pipe lining material 102 impregnated with the thermosetting resin is expanded in the pipe line 101 by air pressure, and the pipe lining material 10 is expanded.
2 is inserted into the hot water hose 112,
Has proposed a pipe lining method in which hot water is showered to cure the thermosetting resin impregnated in the pipe lining material 102 (Japanese Patent Application No. 3-137100).

Thus, according to the construction method proposed above, the pipe lining material 102 is pressed against the inner peripheral surface of the pipe line 101.
Is heated by the hot water showered from the hot water hose 112 to cure the thermosetting resin impregnated in the hot water hose 112, so that the heat energy required to heat the showered hot water is Compared to the heat energy required to heat everything, the heating and circulation facilities such as boilers and hot water pumps are small and compact, and even at large diameters or long pipelines, this can be done at low cost. It can be repaired in a short period of time.

[0007]

However, in the method of construction proposed above, the amount of hot water showered from the hot water hose gradually decreases toward the tip of the hot water hose, so that the heating state of the pipe lining material is long. This causes unevenness in the depth direction, and in particular, a small amount of warm water is showered from the tip of the hot water hose, so that the hardening of the tip of the pipe lining material is delayed compared to other parts.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a pipe lining method capable of uniformly heating the pipe lining material over its entire length and simultaneously curing the same. To do.

[0009]

In order to achieve the above object, the present invention provides a pipe lining material obtained by impregnating a tubular nonwoven fabric having an outer surface coated with a plastic film having high airtightness with a thermosetting resin as a fluid. After being inverted and inserted into the pipe line by pressure, while keeping the pipe lining material pressed against the inner wall of the pipe line, it is heated by a heat medium to cure the thermosetting resin impregnated in the pipe lining material. In the pipe lining method, the hot water hose attached to the tip of the pipe lining material is drawn into the pipe by reversely inserting the pipe lining material into the pipe by air pressure, and air pressure is applied to the inside of the pipe lining material. While still hot water is sent to the tip of the pipe lining material through the hot water hose, the hot water is caused to flow out from the tip of the pipe lining material to form a bottom portion in the pipe lining material. A cyclic flow of hot water from the front end to the rear end is formed, and the cyclic flow of hot water heats the pipe lining material to cure the thermosetting resin impregnated therein. To do.

[0010]

According to the present invention, since the pipe lining material inserted upside down in the pipe line is heated by the hot water that circulates at the bottom of the pipe lining material over its entire length, the pipe lining material has its length. The curable resin impregnated with the resin is uniformly heated along the direction, and the curable resin is simultaneously cured, so that the pipe lining material is not partially delayed.

Also according to the present invention, the thermal energy required to heat the hot water flowing back to the bottom of the pipe lining material is higher than the thermal energy required to heat all the water in the pipe lining material in the previous construction method. The heating and circulation equipment such as the boiler and the hot water pump are small,
Even if it is compact and has a large diameter or a long pipeline,
This can be repaired at low cost in a short period of time.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a sectional view for explaining a pipe lining method according to the present invention, and FIG. 2 is an enlarged sectional view taken along the line AA of FIG.

In the figure, reference numeral 1 denotes a pipe line such as a sewer pipe buried in the ground, and a pipe lining material 2 is reversely inserted into the pipe line 1 by a known method.

The pipe lining material 2 is constructed by impregnating an uncured thermosetting resin into a tubular nonwoven fabric whose outer surface is covered with a highly airtight plastic film. The plastic film may be polyethylene, vinyl chloride, vinylon, polyurethane, nylon,
Polypropylene, polyethylene-nylon copolymer film or the like is used, as the material of the non-woven fabric, polyester, nylon, acrylic, vinylon or the like is used, and as the thermosetting resin impregnated in the non-woven fabric, unsaturated polyester or epoxy resin Etc. are used.

As shown in FIG. 1, the open end (rear end) of the pipe lining material 2 is attached to the open end of the elbow 3 which is bent into an L-shape. The lower end of the guide tube 4 is attached to the upper end opening.

The upper end opening of the guide tube 4 is attached to the outer periphery of the cylindrical fixing tool 5, and the upper end of the fixing tool 5 is closed by a lid member 7 fixed by a plurality of G clamps 6. ing. Therefore, the portion surrounded by the pipe lining material 2, the elbow 3, the guide tube 4, the fixture 5, and the lid member 7 constitutes a closed space S. A pressure gauge 8 and a safety valve 9 are attached to the lid member 7.

By the way, when the pipe lining material 2 is inverted and inserted into the pipe line 1, one end of the hot water hose 1 is attached to the tip of the pipe lining material 2 in the closed space S.
0 and the hot water suction hose 11 connected to the other end of the hot water hose 10 are pulled in.

The hot water suction hose 11 extends through the lid member 7 to the outside of the closed space S and is connected to the lower portion of the water tank 12. A hot water pump 13, a valve 14 and a boiler 15 are provided along the way. It is installed. still,
The portion where the hot water suction hose 11 penetrates the lid member 7 is hermetically sealed by the reversal sealing tube 16.

On the other hand, a warm water discharge hose 17 integrally extends from the elbow 3, and the warm water discharge hose 17 rises upward and faces above the water tank 12, and a valve 18 is connected in the middle thereof. There is.

In the closed space S, the air hose 1
A compressor 20 is connected via 9 and a valve 21 is attached in the middle of the air hose 19.

Thus, in the state shown in FIG. 1, when the compressor 20 is driven and compressed air is supplied into the closed space S through the air hose 19, the internal pressure of the closed space S increases and the pipe lining material is increased. 2 is expanded by air pressure and is pressed against the inner peripheral surface of the conduit 1 as shown in FIG.
The internal pressure of the closed space S is suppressed below a predetermined value by the action of the safety valve 9.

Next, if the hot water pump 13 and the boiler 15 are driven while maintaining the above state, the hot water heated by the boiler 15 flows through the hot water suction hose 11 and the hot water hose 10, and a pipe is drawn from the tip of the hot water hose 10. It flows into the lining material 2.

The hot water flowing out into the pipe lining material 2 collects at the bottom of the pipe lining material 2. A part of the collected hot water is discharged from the hot water discharge hose 17 by the air pressure acting in the closed space S. And then returned to the aquarium 12,
After being heated again by the boiler 15, the hot water hose 10 is passed through the hot water suction hose 11 and the hot water hose 10.
Is supplied into the pipe lining material 2 from the tip of the.

Therefore, at the bottom of the pipe lining material 2, a circulating flow of hot water from the front end to the rear end in the direction of the arrow in FIG. 1 occurs over the entire length of the pipe lining material 2, and the pipe lining material 2 is The thermosetting resin uniformly and simultaneously heated in the circumferential direction and the longitudinal direction by the hot water and the hot air generated from the thermosetting resin impregnated in the pipe lining material 2 runs along the circumferential direction and the longitudinal direction of the pipe lining material 2. And evenly
And it hardens at the same time. As a result, the pipe lining material 2 is not partially delayed in curing, and the pipe line 1 is repaired by lining the inner peripheral surface of the pipe lining material 2 which has been uniformly hardened.

Further, according to the present embodiment, the pipe lining material 2
Since the heat energy required to heat the hot water flowing through the bottom of the inside is less than the heat energy required to heat all the water in the pipe lining material in the conventional construction method, the water tank 12, the hot water pump 13, Even if the heating / circulation equipment such as the boiler 15 is made small and compact and the pipeline 1 has a large diameter or a long diameter, it can be repaired at low cost in a short period of time.

By the way, as shown in FIG. 3, a hose 22 with a float may be drawn into the pipe lining material 2 separately from the hot water hose 10. Incidentally, FIG. 3 is a view similar to FIG. 2 showing a modified embodiment of the present invention.

As shown in FIG. 4, the float hose 22 is constructed by spirally winding a rope 24 having a plurality of floats 23 attached at an appropriate pitch, and a plurality of ejection holes 25 having a length. It is perforated at an appropriate pitch in the direction.

When the floating hose 22 is pulled into the pipe lining material 2 as described above, the floating hose 22 floats on warm water as shown in FIG. The ejection hole 25 formed in this
If water or hot water is showered from the above, the hardening heat generation of the pipe lining material 2 can be controlled.

[0030]

As is apparent from the above description, according to the present invention, a tubular lining material obtained by impregnating a thermosetting resin into a tubular nonwoven fabric whose outer surface is covered with a highly airtight plastic film is used as a fluid. After being inverted and inserted into the pipe line by pressure, the pipe lining material is pressed against the inner wall of the pipe line,
In a pipe lining method in which the thermosetting resin impregnated in the pipe lining material is cured by heating this with a heat medium, the pipe lining is inserted by inverting the pipe lining material into the pipe line by air pressure. The hot water hose attached to the tip of the material is drawn into the pipe, and hot water is sent through the hot water hose to the tip of the pipe lining material while applying air pressure inside the pipe lining material, and the hot water is fed to the tip of the pipe lining material. To form a circulating flow of hot water at the bottom of the pipe lining material from the front end to the rear end, and the circulating flow of hot water heats the pipe lining material to impregnate it with thermosetting material. Since the resin is hardened, the effect that the pipe lining material can be heated uniformly over its entire length and hardened simultaneously can be obtained. It is.

[Brief description of the drawings]

FIG. 1 is a sectional view for explaining a pipe lining method according to the present invention.

FIG. 2 is an enlarged sectional view taken along line AA of FIG.

FIG. 3 is a view similar to FIG. 2 showing a modified embodiment of the present invention.

FIG. 4 is a partial side view of a hose with a float.

FIG. 5 is a cutaway perspective view inside a pipe showing a conventional pipe lining method.

[Explanation of symbols]

 1 Pipe line 2 Pipe lining material 10 Hot water hose 22 Hose with float

Claims (2)

(57) [Claims] 1. A pipe lining material, which is formed by impregnating a thermosetting resin into a tubular nonwoven fabric whose outer surface is covered with a highly airtight plastic film, is reversely inserted into the pipe line by fluid pressure, and then the pipe lining material is inserted. In the pipe lining method in which the thermosetting resin impregnated in the pipe lining material is cured by heating the pipe lining material while pressing the pipe lining material in the pipe line by air pressure. Flip insert
Attached to the tip of the pipe lining material by
The warm water hose that has been
Use warm water hose with warm water while applying air pressure inside.
Through the pipe lining material, and the hot water is discharged from the tip of the pipe lining material to the bottom of the pipe lining material.
It forms a circulating flow of warm water from the front end to the rear end,
The pipe lining method is characterized in that the pipe lining material is heated by the circulating flow of the hot water to cure the thermosetting resin impregnated therein. 2. A hose with a float is inserted into the inside of the pipe lining material to which air pressure acts, and water or hot water is showered from the hose with the float to control heat generation during hardening of the pipe lining material. The pipe lining method according to claim 1 .