JPH0577817B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lining method that can be advantageously used when repairing or reinforcing walls of existing structures such as tunnels and sewer pipes.

[Conventional technology]

Conventionally, when repairing or reinforcing the walls of existing structures, polyester resin and glass fibers were alternately laminated, defoamed, and cured to form a lining layer of FRP on the walls of non-cylindrical existing structures such as tunnels. A lining method was considered, but this method required a lot of work to degas the layers, and there was also concern that large amounts of styrene, the solvent for FRP, would be generated, worsening the working environment.

In addition, for the wall of an existing cylindrical structure such as a sewer pipe, a lining layer is formed by inserting pipe material into the existing structure and injecting mortar between the existing structure and the pipe material. was. However, this method lacks adaptability to large-diameter cylindrical bodies and has the disadvantage that the internal passage after lining becomes extremely narrow due to the thickness of the lining layer.

Therefore, the present applicant previously proposed the following lining method. This method is based on pressing an uncured UV-curable synthetic resin onto the wall of an existing building and directly curing it by irradiating it with UV rays.

This method eliminates the need for the laborious lamination defoaming work described above, prevents deterioration of the working environment, and is suitable for not only small and medium-sized sewer pipes but also large-diameter sewer pipes. It can be fully applied to existing structures such as non-cylindrical tunnels, and since the lining layer is thin, even if the existing structure is cylindrical, such as a sewer pipe, the internal passages after lining will not be as narrow and sparse. There are no advantages.

[Problem that the invention seeks to solve]

However, the above-mentioned method using UV-curable synthetic resin requires the UV irradiation device to be moved slowly to cure the synthetic resin with UV rays, and it takes a long time when a wide range of wall surfaces must be lined. It will require. Furthermore, since an expensive device such as an ultraviolet irradiation device is separately required, it also has the drawback of lacking economic efficiency. Furthermore, there were also problems with the transportation and installation location of the ultraviolet irradiation device or the machine that moves it.

The present invention solves these problems,
To provide a lining method capable of lining a wide range of wall surfaces in a short time.

[Means for solving problems]

In order to solve the above problems, the method of the present invention involves pressing an uncured sheet or tube made of thermosetting synthetic resin against the wall of an existing building, and then blowing hot air onto the sheet or tube to thermally cure it. Features.

〔Example〕

FIGS. 1 and 2 show a case where a sewer pipe 1, which is an example of an existing structure, is repaired or reinforced.

In FIG. 1, 2 indicates a tube made of uncured thermosetting synthetic resin. This tube 2 is pressed against the wall surface of the sewer pipe 1 between two manholes 3 and 4, and a hose 5 for supplying hot air is connected to one end of the tube 2, and a hose 5 for discharging hot air is connected to the other end. Hose 6 is connected. The tube 2 can be pressed against the wall of the sewer pipe 1 by supplying air to the tube 2 inserted into the sewer pipe 1 to inflate the tube 2, or by evacuating the space between the tube 2 and the sewer pipe 1. In addition to a method that utilizes the differential pressure between the inside and outside of the tube 2, such as a method of inflating the tube 2 with a hand, it is also possible to employ a method of mechanically pressing the tube 2 against a wall surface.

After pressing the tube 2 against the wall surface as described above, the hot air blower 7 installed on the ground is activated to send hot air into the tube 2 through the hose 5, and while the feeding continues, the hot air is constantly supplied from the hose 6. The hot air that has penetrated the inside of the tube 2 is discharged. In this way, pressing the tube 2 against the wall surface and supplying hot air may be done separately, but the tube 2
If hot air is directly supplied to the tube and pressed against the wall surface, there is an advantage that the tube 2 can be inflated and the tube 2 can be hardened by one air supply. Furthermore, as described above, supplying and discharging hot air simultaneously has the advantage of preventing a drop in temperature within the tube 2 and uniformly heating the tube 2. Further, the hot air discharged from the hose 6 is preferably discharged into the inside of the sewer pipe 1a which will be lined next time, and the sewer pipe 1a is preheated by the residual heat of the hot air. In this way, a decrease in the temperature of the hot air supplied into the tube during lining the wall surface of the sewer pipe 1a is suppressed, and a reduction in working time can be expected.

By blowing hot air onto the tube 2, the tube 2 is heated and thermally hardened. After the tube 2 is cured by heat, remove the hoses 5, 6 and other incidental equipment for supplying hot air, and
Cut off both ends of the FRP coating 8, as shown in Figure 2.
9 prevents both ends of the tube 2 from peeling off from the sewer pipe 2.

In the above, if FRP mixed with medium temperature or high temperature type curing agent is used as tube 2, set the hot air temperature to 80 to 150℃ and the internal pressure of tube 2 to about 0.1 to 5 kg/cm ² . and 2
Tube 2 is heat cured in ~5 hours.

FIG. 3 shows the structure of the connection between the tube 2 and the hose 5 for supplying hot air. As shown in the figure, the end of the tube 2 is squeezed into a resilient stopper 10 made of cork or the like, and its periphery is fixed with bolts 11, and a flexible member 12, such as rubber The surrounding area is protected by wood. and,
A connecting pipe 14 having an on-off valve 13 is inserted into the stopper 10, and a hose 5 is connected to this connecting pipe 14. 15 is a pressure gauge that detects the pressure inside the tube 2. Figure 4 shows the arc member 1 divided into two parts.
6 and 16 with bolts and nuts 17, 17, the end of the tube 2 is secured to the stopper 1.
It is shown that it is fixed at 0.

The tube 2 described above can be easily made by folding a sheet into a tube shape, overlapping the ends thereof, and joining the overlapping portions with adhesive tape or the like.

The tube 2 used in the above method is made of thermosetting synthetic resin such as FRP, which is a polyester resin mixed with glass fiber and a catalyst activated by heat. Sticky and difficult to handle. In order to prevent this and improve the handleability of the tube 2, thin films 18 and 19 may be superimposed on the inside and outside of the tube 2, as shown in FIG. 5a. As the thin films 18 and 19, PVA film or polyester film is used, which has excellent releasability to uncured synthetic resin.

However, if the thin films 18 and 19 are simply superimposed on the inside and outside of the tube 2 as described above, there is a risk that the outer thin film 19 will rub against the sewer pipe and break when the tube 2 is inserted into the sewer pipe. In addition, thin film 1
If PVA film is used for 9, PVA
Since the thin film 19 is water-soluble, the thin film 19 will melt due to water leakage from the sewage pipe, and the thin film 19 will become locally thinner than other parts, or in severe cases, it will melt away. If such a situation occurs, the unhardened tube 2 will be exposed to the pipe line, causing tears or insufficient wall thickness in some parts, which may cause air leaks during the air supply stage or water intrusion into the interior. As a result, smooth work may not be possible and construction reliability may be impaired.

In order to eliminate such a fear, for example, as shown in FIG. 5b, a covering material 20 made of soft polyvinyl chloride resin or the like can be superimposed on the outer side of the thin film 19 superimposed on the outside of the tube 2. Bye. If you do this, tube 2
When inserted into a sewer pipe, the sheathing material 20 simply rubs against the sewer pipe, and the thin film 19 is inserted into the sheathing material 20.
protected by Therefore, the thin film 19 is prevented from being torn and the uncured tube 2 is exposed to the conduit. It is also possible to prevent the PVA film of the thin film 19 from dissolving due to water leakage.

Although FIG. 5b shows the case where the covering material 20 is superimposed on the outside of the tube 2, the covering material may be superimposed on the inside of the tube 2. in this case,
The outer thin film may rub against the sewage pipe and break, but even if the thin film breaks, the inner coating of tube 2 prevents air leakage during the air supply stage and water intrusion into the interior. The flow of resin closes the broken part. The same applies when the thin film is PVA film and is dissolved due to water leakage.

Furthermore, as shown in FIG. 5c, covering materials 20 and 21 may be superimposed on the outside of the outer thin film 19 and the inside of the inner thin film 18, respectively.

The above-mentioned embodiments relate to the repair or reinforcement of cylindrical existing structures such as sewer pipes, but the method of the present invention is also effective when repairing or reinforcing non-cylindrical existing structures such as tunnels. It is.

For example, when repairing or reinforcing the wall surface of a tunnel 22 as shown in FIG. 6, an uncured sheet 23 made of thermosetting synthetic resin is pressed against the wall surface, and hot air is blown onto the sheet 23. 23 may be thermally cured. Reference numeral 24 denotes a fixture that prevents air from escaping when the sheet 21 is pressed against a wall surface using differential pressure, and is fixed to the wall surface by a method such as an anchor ring. sheet 2
3 is the same as described above in that the sheet is overlapped with the covering material to improve handling, and that the sheet is pressed against the wall surface using differential pressure.

〔Effect of the invention〕

As is clear from the above, the method of the present invention uses a thermosetting sheet or tube as the lining material and hot air as the heating means, so even when lining a wide area of the wall, the sheet or tube can be shortened. It can be heated evenly in a short amount of time,
The curing time does not vary much depending on the width and length of the wall to be lined. Furthermore, the device for supplying hot air is not as expensive as the ultraviolet irradiation device and is easier to control, so the overall workability of the lining operation is improved. In addition, the hot air device can be placed in a separate location, so even if the space for lining is small, the work can be done easily. Furthermore, it is also possible to preheat the wall surface to be lined next using the residual heat of the hot air blown onto the sheet or tube, and this has the advantage of further improving work efficiency.

[Brief explanation of drawings]

Figures 1 and 2 are cross-sectional views showing the case where the method of the present invention is applied to an existing cylindrical object, Figure 3 is a cross-sectional view showing the connection between the tube and the hose, and Figure 4 is the tube and the stopper. Fig. 5a is a partial cross-sectional view showing a tube with a thin film overlaid thereon, and Figs. 5b and 5c show a tube with a thin film and a covering material overlaid on each other. FIG. 6 is a partial sectional view showing a case where an existing non-cylindrical object is lined by the method of the present invention. 1, 1a... Sewer pipe, 2... Tube, 5...
Hot air supply hose, 6...Hot air discharge hose, 2
2...tunnel, 21...seat.

Claims (1)

[Claims] 1. A lining method characterized by pressing an uncured sheet or tube made of a thermosetting synthetic resin against the wall of an existing building, and then blowing hot air onto the sheet or tube to thermally cure it.