JPH068323A - Repairing method of underground piping - Google Patents

Abstract

PURPOSE:To reduce the scattering in curing time due to atmospheric temperature by a method wherein the temperature of resin is controlled during the insertion of repairing sheet when repairing fixture, which is produced by impregnating the repairing sheet with the mixture of the liquid resin and curing agent, is inserted in underground piping for repairing its and pressed against the inner surface of the piping. CONSTITUTION:In order to repair underground piping, liquid synthetic resin and curing agent are mixed together so as to be infiltrated in repairing sheet made of reinforcing fiber in order to obtain repairing material. The repairing material is inserted in underground piping under the condition being attached onto the outer periphery of repairing fixture such as peripherally expandable packer or the like. By expanding the repairing fixture peripherally, the repairing material is pressed against the inner surface of the underground piping so as to cure the resin. During the insertion process of the repairing material in the piping, the temperature of the resin is controlled. The preferable temperature controlling method is to control the temperature of the resin before its charging in a mixer or during its mixing in the mixer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for repairing damage or the like of an underground pipeline from the inner surface side of the underground pipeline.

[0002]

2. Description of the Related Art This type of underground pipe repair method has been conventionally performed as follows.

First, the repair device will be described. In FIG. 2, 1 is an underground pipe, 2 is a manhole, 3 is a repair device, and the underground pipe 1 has a crack 1a.

The repair device 3 connects a packer (corresponding to the repair tool in the present invention) 4, an air compressor 5 mounted on the bed of the truck T, and the packer 4 and the air compressor 5 to each other. And a hose 6 that operates.

The packer 4 of this example has a cylindrical frame 7
A rubber sheet portion 11 is arranged around the outer circumference of the frame 7 between the end plates 8 and 9 fixed to both ends of the ring-shaped air chamber 12 to form an annular air chamber 12.

In the air chamber 12, compressed air can be supplied and discharged from an air inlet / outlet 13 formed in one of the end plates 8 through a hose 6.

The rubber sheet portion 11 is bulged by the supply of compressed air to the air chamber 12, and the repair material 14 mounted on the outer periphery of the rubber sheet portion 11 is pressed against the inner surface of the underground pipeline 1 to form the crack 1a. It is something to repair.

Underground pipeline 1 using such a repair device 3
The conventional repair method is as follows.

First, on the ground G, a repair material 14 is prepared by impregnating a cloth-like repair sheet with a liquid synthetic resin material.

To prepare the repair material 14, the liquid synthetic resin and the curing agent, which are separately stored in a storage container such as a drum can mounted on the bed of the work truck T, are taken out,
It is carried out by mixing with a mixer mounted on the truck T and impregnating this with a cloth-like repair sheet of reinforcing fibers or the like.

The repair material 14 thus prepared is
It is mounted on the outer peripheral surface of the rubber sheet portion 11 of the non-expanded packer 4.

The packer 4 fitted with the repair material 14 is inserted into the underground conduit 1 through the manhole 2 and is located at a required position facing the crack 1a.

Thereafter, compressed air is supplied from the air compressor 5 into the air chamber 12 of the packer 4 to expand the packer 4, and the repair material 14 mounted on the outer circumference of the packer 4 is compressed to a predetermined pressure. Then, the inner surface of the underground pipeline 1 including the crack 1a is pressed.

After this state is maintained as it is, after the curing of the repair material 14 is completed, the air in the air chamber 12 is discharged to shrink the rubber sheet portion 11 of the packer 4 and the packer 4 in the underground conduit 1. Complete the repair work by pulling it out into the manhole 2.

In such a conventional underground pipe repairing method, the temperature of the synthetic resin or the like stored in the storage container is affected by the temperature, and the preparation work of the repairing material 14 such as mixing with a mixer or the like. The insertion work of the packer 4 is also performed under the influence of the temperature.

[0016]

Therefore, in the conventional repair work of such underground pipes, since the synthetic resin, the curing agent and the like have a temperature which is originally influenced by the ambient temperature, they are mixed with the curing agent. The curing rate of the synthetic resin thus produced varies depending on the temperature.

That is, when the temperature is high, the repair work of the underground pipeline is required to be performed in a short time before the curing of the synthetic resin is completed. On the contrary, when the temperature is low, the repair work takes a long time. It will be passed.

Therefore, in the repair work of the underground pipeline, the worker must work depending on the temperature, which is inconvenient for the worker to perform the work uniformly according to a certain time procedure. there were.

The present invention has been made under such circumstances, and it is possible to carry out the repair work of the underground pipeline satisfactorily so that the influence of the temperature is small and the work can be performed uniformly in a fixed time procedure. The purpose is.

[0020]

In order to achieve this object, the invention according to claim 1 is a storage step of separately storing a liquid synthetic resin and a curing agent, and a stored liquid synthetic resin. A mixing step of mixing a curing agent with a curing agent, an impregnation step of impregnating the repair sheet with the synthetic resin mixed in the mixing step to form a repair material, and the above-mentioned outer circumference of the repair tool capable of expanding and contracting in the circumferential direction. A mounting step of mounting the repair material, an inserting step of inserting the repair tool mounted with the repair material in the mounting step into a required position in the underground pipeline, and the repair tool at a required position in the underground pipeline In a method of repairing an underground pipeline having a construction step of expanding the above in the circumferential direction to press the repair material against the inner surface of the underground pipeline, in any of from the storing step to the inserting step, at least the above-mentioned composition. Adjust the resin temperature And wherein the Rukoto.

[0021]

In general, the curing rate of a synthetic resin mixed with a curing agent varies depending on its temperature.

According to the first aspect of the invention, since the temperature of the synthetic resin is adjusted at least at any time from the storage step to the insertion step, the curing rate of the synthetic resin is independent of the ambient temperature. Therefore, the variation is smaller than in the conventional case, and the curing of the synthetic resin can be completed in a substantially constant time.

Therefore, the work time until the completion of the repair work of the underground pipeline does not vary as much as before, and a fixed work can be performed uniformly in a fixed time procedure, and the repair work can be performed well. .

[0024]

EXAMPLE A method for repairing an underground pipe according to an example will be described below with reference to a work process diagram shown in FIG.

Since the repair device 3 used in the following repair method is the same as that described above, the following description will be made with reference to FIG.

The worker mounts the required materials and the like on the work truck T, visits the construction site for the repair work, and carries out the following repair method.

On the loading platform of the work truck T, in addition to the repair device 3 and related equipment, a material such as synthetic resin used for repair work and a repair sheet are mounted.

Materials such as synthetic resin in this embodiment are
For example, a liquid epoxy resin, a curing agent for epoxy resin, a defoaming material, and an adhesion aid.

These materials such as synthetic resin are stored in separate storage containers such as drums and the like, and are stored in a thermostatic chamber installed on the bed of the work truck T and kept at a constant temperature. Temperature is adjusted.

In such a state, at the construction site, the following preparatory work is performed prior to the construction.

First, as described above, the liquid synthetic resin, the curing agent, the required defoaming material, and the adhesion aid, which were stored at a constant temperature in the constant temperature tank of the work truck T, were mounted on the bed of the truck T. Then, it is charged into the mixer M (see FIG. 3) and the mixing process is started.

In this case, the mixing ratio is about 60 to 70% by weight of the epoxy resin, and about 40 to 30% of the curing agent for the epoxy resin, the defoaming agent and the adhesion aid, in the weight ratio. Both are in a state of being cooled to a required temperature in the constant temperature bath.

The same effect can be obtained by cooling only the temperature of the epoxy resin having a large quantity, without setting all the temperatures of the epoxy resin and the curing agent to the required temperatures.

At the start of this mixing process,
Materials such as synthetic resin and curing agent put in the mixer M are
As described above, since it is stored at a constant temperature in a constant temperature bath, unlike the conventional method, the temperature of the synthetic resin does not change due to seasonal temperature changes, and the curing speed of the synthetic resin becomes constant and Variation in the time to complete is reduced.

In winter, etc., the present invention may be carried out by appropriately heating the synthetic resin, the curing agent and the like in a constant temperature bath to maintain a desired temperature.

The mixer M of this embodiment is further provided with a temperature adjusting structure in order to avoid the influence of air temperature and reaction heat on the synthetic resin, the curing agent and the like (hereinafter simply referred to as synthetic resin) during kneading. It is provided.

That is, in FIG. 3, this mixer M
A so-called water jacket 22 is installed on the side wall of the mixing chamber 21.

A circulating pump 24 and a tank 25 are installed in a circulating water circuit 23 passing through the water jacket 22. Inside the tank 25, a circulating water temperature adjusting device 26 is provided.
Is installed. The temperature control device 26 of this embodiment is a heat pump device that is driven by compressing a refrigerant by a compressor 27, and switches the circulation direction of the refrigerant to heat or cool the circulating water in the tank 25. Is also made possible.

Further, the compressor 27 of the temperature adjusting device 26
The rotation speed of the control unit 29 is based on a signal from a temperature sensor 28 arranged in the circulating water in the tank 25.
Is calculated to indicate the required rotation speed, the circulating water temperature in the tank 25 can be maintained at the required temperature.

Therefore, the tank 25 circulates the cooling water when the temperature is high in summer and the like, and circulates the hot water when the temperature is low in winter and the like, thereby mixing in the mixing chamber 21. The temperature of the synthetic resin used can be adjusted.

The mixing process by the mixer M is as follows.
For example, it takes about 20 minutes, and since the synthetic resin or the like is stirred and mixed in the mixing chamber 21 by the stirring blade 21a, heat exchange of the synthetic resin or the like can be efficiently performed in this mixing step.

The temperature adjustment in this mixing step can be performed uniformly over the entire synthetic resin or the like in a relatively short time, and the temperature adjustment can be performed in parallel with the mixing step, so that it takes extra time. Therefore, there is an advantage that the time required for repair work is not extended.

Next, the repair material 14 is obtained by the impregnation step.

In the impregnation step, the repair sheet 14 is obtained by impregnating the repair sheet with the synthetic resin or the like that has been appropriately cooled and maintained at the required temperature even in the mixing step as described above.

The repair sheet is a cloth-like base material made of reinforcing fibers such as glass wool mat, and is a sheet-like material in this embodiment.

The repair sheet may be formed in a tubular shape having a diameter slightly larger than the outer diameter of the packer 4.

The operation of impregnating the repair sheet with the synthetic resin or the like is performed as shown in, for example, FIGS. 4 (A) to 4 (D).

That is, FIG. 4A shows a state in which the polyethylene sheet 32 is spread on the work table 31 and the repair sheet 33 is spread on the work sheet 31, and the liquid synthetic resin is supplied.

A water jacket 31a is formed inside the work table 31. The water jacket 31a is connected to the circulation circuit 23 similar to the above, and the temperature change of the repair sheet 33 on the work table 31 is changed. Is designed to suppress. In addition, the arrow in a figure shows the flow direction of circulating water.

The repair sheet 33 supplied with the synthetic resin is folded on the work table 31 (FIG. 4B), and the polyethylene sheet 32 is folded back on the upper side of the work sheet 31 and the manual pressure roll 34 is fed from the upper side. Rolling and pressurizing (FIG. 4C), the repair sheet 33 can be impregnated with synthetic resin in the polyethylene sheet 32, and the repair material 14 can be obtained (FIG. 4D). .

During the impregnation work, the synthetic resin and the repair sheet 33 are located on the workbench 31, so that the temperature change thereof is suppressed by the water jacket 31a installed inside the workbench 31.

Since this impregnation step is performed in about several minutes, the temperature adjustment by the water jacket 31a of the work table 31 may be omitted in some cases.

The repair material 14 thus obtained by impregnating the repair sheet 33 with a synthetic resin or the like is provided on the outer side of the peeling polyethylene sheet 35 wound around the rubber sheet portion 11 of the packer 4. , Wound and mounted (Fig. 4
(See (E)). Since this mounting step is also performed on the work table 31, the temperature change of the synthetic resin is suppressed by the water jacket 31a also in this mounting step.

Repair material 1 impregnated with synthetic resin or the like
The packer 4 fitted with 4 is inserted into a position corresponding to the crack 1a in the underground conduit 1 through the manhole 2.

The insertion work of the packer 4 is carried out in the same manner as in the prior art, with the manholes 2 located on both sides of the crack 1a.
The packer 4 is pulled between the two parts via a rope so that the packer 4 is positioned at a desired portion.

This insertion step is also performed in a short time, and
Since the temperature of the manhole 2 and the underground conduit 1 is less fluctuated as compared with the above-ground G, heat exchange between the synthetic resin impregnated in the repair material 14 and the temperature is small.

If the portable air conditioner is installed in the manhole 2 or the like to be worked and the insertion process is performed,
It is possible to suppress the change of the synthetic resin temperature during the inserting step.

Therefore, even after the impregnation step, the mounting step and the inserting step, the synthetic resin or the like is hardened by the temperature of the synthetic resin or the like in the mixing step as a reference. .

After this, the construction process is performed as follows.

In the construction process, compressed air having a required pressure is supplied from the air compressor 5 to the air chamber 12 via the hose 6 to the packer 4 which is positioned at the required position as described above. When the seat portion 11 bulges outward, the repair material 14 is pressed against the inner surface of the underground conduit 1.

As a result, the repair material 14 comes into close contact with the surface of the crack 1a, but the repair material 14 is held in this state with the packer 4 until the curing of the synthetic resin or the like is completed (about 2 hours). It is necessary to keep it.

In this case, since the temperature of the synthetic resin or the like adjusted in the mixing step or the like is adjusted in advance, the time until the curing of the synthetic resin or the like does not vary as much as in the conventional case.

This means that it is possible to set a preferable working time for the mixing step, the impregnating step and the inserting step prior to this construction step, and to carry out the work on the basis of the set preferable working time. Is.

Therefore, in the repair work of the underground pipeline, the work of each process can be homogenized, and the effect of the temperature can be reduced to perform a good repair work.

After the curing of the synthetic resin or the like is completed in this way, the compressed air in the air chamber 12 of the packer 4 is discharged, the packer 4 is reduced, and the packer 4 is taken out through the manhole 2. The completion of the repair work for the underground pipeline is the same as before.

In the above-described examples, the epoxy resin is used as the synthetic resin, but the present invention is not limited to this, and the unsaturated polyester and the curing agent therefor may be used.
Even if other synthetic resin is used, the same operation can be performed.

Further, in this embodiment, the temperature of the synthetic resin or the like was adjusted throughout the storage process prior to the mixing process to the mounting process. However, in the present application, any one of the processes before the construction process, For example, the temperature of the synthetic resin or the like may be adjusted only in the mixing step or over all of the above steps.

In such a case, the temperature of only the synthetic resin can be adjusted in the storing step, and the temperatures of the synthetic resin, the curing agent and the like and the repair sheet can be adjusted in total from the impregnating step to the inserting step.

Further, among the series of steps shown in FIG. 1, the steps from the storage step to the impregnation step are performed in advance in the factory, and the repair material 14 impregnated with synthetic resin or the like is stored in a container having a temperature control function. If repairing work is carried out at the required temperature and carried to the construction site, repair material 1
Since the synthetic resin impregnated in 4 is maintained at the required temperature for a long time including the transportation time to the construction site,
As in the case of the above-described embodiment, it is possible to reduce the influence of the temperature and perform good repair work.

[0070]

As described above, according to the invention described in claim 1, the temperature of the synthetic resin is adjusted at least at any time from the storage step to the insertion step.
The curing speed of the synthetic resin has less variation compared to the conventional one regardless of the temperature, and the curing of the synthetic resin can be completed in a substantially constant time.

Therefore, the work time until the completion of the repair work of the underground pipeline does not vary as much as before, and a fixed work can be performed uniformly in a fixed time procedure, and the repair work can be performed well. .

[Brief description of drawings]

FIG. 1 is a process diagram of a method for repairing an underground conduit.

FIG. 2 is an explanatory diagram of a method of repairing an underground pipe.

FIG. 3 is a structural explanatory view of a mixer.

4 (A) to (E) are explanatory views of impregnation of a repair sheet and a mounting step.

[Explanation of symbols]

 1 Underground pipeline 1a Crack 3 Repair device 4 Packer (repair tool) 14 Repair material

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[Procedure amendment]

[Submission date] July 3, 1992

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

Claims (4)

[Claims] 1. A storage step of separately storing a liquid synthetic resin and a curing agent, a mixing step of mixing the stored liquid synthetic resin and the curing agent, and a synthetic resin mixed in the mixing step. Of the repair sheet by impregnating the repair sheet with the repair sheet, the mounting step of mounting the repair material on the outer circumference of the repair tool that can expand and contract in the circumferential direction, and the repair step in which the repair material is mounted An insertion step of inserting the tool into a required position in the underground pipeline, and a construction in which the repair tool is expanded in the circumferential direction at a required position in the underground pipeline to press the repair material against the inner surface of the underground pipeline. In the method for repairing an underground pipe having a step, in any of from the storage step to the insertion step,
A method for repairing an underground conduit, which comprises adjusting the temperature of the synthetic resin at least. 2. The method for repairing an underground pipeline according to claim 1, wherein the temperature of the synthetic resin is adjusted by cooling the synthetic resin. 3. The underground pipeline repair method according to claim 1 or 2, wherein the temperature of the underground pipeline is adjusted prior to adding the synthetic resin to the mixer in the mixing step. Method. 4. The method for repairing an underground pipe according to claim 1, wherein the temperature of the synthetic resin is adjusted in parallel with the mixing step.