JPH0688337B2 - Inversion lining method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention provides a lining material having a felt layer made of acrylic fiber impregnated with an ultraviolet-curable unsaturated polyester resin for sewerage, waterworks, oil pipes and other existing pipes. The present invention relates to a reverse lining method of lining the inner surface.

[Prior art] In recent years, for the purpose of reinforcing the strength of existing pipes such as sewers and waterworks, anticorrosion measures, water leakage and water infiltration measures, and improving the flow rate, synthetic resin is lined on the inner surface of the existing pipe or synthetic resin is applied on the inner surface of the existing pipe. The reverse lining method of forming a tube is in the spotlight.

For example, the method disclosed in JP-B-55-43890 and JP-A-64-85738 discloses a method in which a needle felt layer is coated with epoxy,
Inside the existing pipe, the lining material impregnated with liquid thermosetting resin such as polyester is reversed and advanced by fluid pressure inside the existing pipe, and the reversed lining material is pressed against the inside surface of the existing pipe by fluid pressure to cure the thermosetting resin. This is a method of forming a synthetic resin pipe on the surface.

A conventional thermosetting resin-impregnated lining material represented by JP-B-55-43890 is inverted and then heat-cured to form a synthetic resin pipe, but the total heating time and cooling time during heat-curing For example, when polyester resin is used as thermosetting resin for the lining material with a diameter of 300 mm and a thickness of 6 mm,
It takes 15 hours. Further, even if the quick-drying type of the epoxy resin is used, it takes about 6 to 8 hours, and the working time is long. This is also due to the fact that heat is stored in the existing pipe and surrounding soil during the long heating and holding period, and the cooling rate becomes slow.

In order to eliminate such drawbacks, a lining material consisting of a felt layer impregnated with a resin that is cured by irradiating ultraviolet rays to a fibrous material is used, and a synthetic resin is applied to the inner surface of the existing pipe in a short working time. A method of lining the above is disclosed in, for example, JP-A-60-242038, JP-A-61-117343 or JP-A-62-132631.

[Problems to be Solved by the Invention] In the conventional lining method disclosed in Japanese Patent Laid-Open No. 60-242038, an inner lining material which is cured by irradiation with ultraviolet rays is sequentially reversed while being directly reversed by a pressure medium. Since the material is pressed against the inner surface of the existing pipe, it takes time to invert and insert the lining material into the existing pipe. For this reason, a special light-shielding device is required in order to prevent the curing of the lining material, which is hardened rapidly even by the sun's rays, at the time of reversing / inserting, and the lining device and the process are complicated. there were.

In addition, JP-A-61-117343 or JP-A-62-132631.
As disclosed in the official gazette, the lining material is pressed directly against the inner surface of the existing pipe with a swirling roller, or air is supplied to the entire inside of the collapsed lining material to expand and expand the lining material at once and When pressed against the surface, there is a disadvantage that wrinkles are easily generated in the circumferential direction and the major axis direction of the lining material.

Furthermore, if the lining material is expanded / expanded at one time and pressed against the inner surface of the existing pipe, the accumulated water and air in the existing pipe will not be sufficiently discharged, and a gap will be created between the existing pipe and the lining layer, and It also had the disadvantage of causing water leakage.

The present invention has been made to solve the above disadvantages, and an object of the present invention is to propose a reverse lining method capable of reliably pressing an inner lining material against an inner surface of an existing pipe and hardening it by a simple device and process. It is a thing.

[Means for Solving the Problems] The inversion lining method according to the present invention includes a step of inserting an lining material into an existing pipe, a step of expanding the inserted lining material to press it against the inner surface of the existing pipe, and an expanded lining material. It consists of curing the material.

In the process of inserting the lining material, the tip of the lining material, which has a felt layer made of acrylic resin impregnated with an ultraviolet curable unsaturated polyester resin, is inverted and fixed to the pressure fluid supply port provided at the end of the existing pipe to supply pressure fluid. The lining material is inverted and penetrates into the existing pipe while supplying a low pressure fluid corresponding to the inverting pressure of the lining material from the mouth.

In the expansion / pressing process, the tip of the lining material that penetrates is fixed to the pipe joint with fluid supply valve to seal it, and the rear end of the lining material that is fixed to the pressure fluid supply port has the same length as the lining material and is transparent to ultraviolet light. The reversing hose, which has good properties, is re-fixed to the pressure fluid supply port together with the folded portion at the tip of the reversing hose, and the pressure fluid is supplied from the fluid supply valve at the tip of the liner to pre-expand the liner in the diameter direction of the existing pipe, While discharging the pressure fluid supplied from the supply valve, supply the pressure fluid with a higher pressure than this pressure fluid from the pressure fluid supply port to invert / progress the reversing hose into the lining material, and the lining material from the rear end. Sequentially press the inner surface of the existing pipe.

In the curing step, the lining material pressed against the inner surface of the existing pipe is irradiated with ultraviolet rays from an ultraviolet ray generating device connected to the rear end of the reversing hose, whereby the lining material is sequentially cured from the rear end portion.

[Operation] In the present invention, the low-pressure pressure fluid corresponding to the reversal pressure of the lining material is supplied from the pressure fluid supply port to the lining material whose tip is inverted and fixed to the pressure fluid supply opening provided at the end of the existing pipe. However, by reversing the lining material without pressing it against the inner surface of the existing pipe, the lining material is inverted and inserted into the existing pipe without resistance.

Perform two-stage expansion by pre-expanding the lining material inserted into the existing pipe in the diameter direction of the existing pipe, adjusting the shape of the lining material, and then expanding again from the rear end of the lining material by the reversing hose. Thus, the lining material is pressed against the inner surface of the existing pipe while discharging the water and air accumulated between the inner surface of the existing pipe and the lining material.

By irradiating the pressed lining material with ultraviolet rays in order from the rear end, the lining material is rapidly cured. When irradiating this ultraviolet ray to cure the lining material, the reversing hose has good ultraviolet ray transparency, so that the lining material can be irradiated without the ultraviolet ray being absorbed by the reversing hose.

[Embodiment] FIG. 1, FIG. 2, and FIG. 3 are process drawings showing a construction process of an embodiment of the present invention. FIG. 1 shows an existing pipe 1 and a lining material 2
FIG. 2 shows an inserting step of inserting the lining material, FIG. 2 shows an expanding / pressing step of the lining material 2, and FIG. 3 shows a hardening step of the lining material 2.

In explaining the construction process shown in FIGS. 1 to 3,
First, the lining material 2 used in this embodiment will be described with reference to the perspective view of FIG.

In FIG. 4, 3 is an outer layer film tube of the lining material 2, the outer layer film tube 3 has excellent solvent resistance,
It is made of white synthetic resin film such as nylon and vinylon. Reference numeral 4 denotes a felt layer laminated on the inner surface of the outer film tube 3, and the felt layer 4 is a layer for determining the thickness of the synthetic resin tube after molding, and as shown in the sectional view of FIG. For example, thickness t = 6m
The felt 4a is formed by punching so as to be 500 g to 1800 g / m ² at m, and the glass fiber 4b having a length of, for example, 30 mm or more on both sides or one side of the inner and outer sides of the felt 4a.
20% by weight or more are dispersed and integrated by punching, and the felt 4a is impregnated with a UV-curable unsaturated polyester resin containing a photoinitiator that absorbs a long-wavelength spectrum of 350 to 450 nm where the penetration depth of near-UV rays is large. There is. The ultraviolet curable unsaturated polyester resin impregnated in the felt 4a is made of, for example, a neopentine glycol acrylate resin or an epoxy acrylate resin, and the photoinitiator is, for example, an acylphosphine oxide and a solvent, or an acylphosphine oxide and a light in the thickness direction. It consists of a peroxide catalyst and a solvent that assist the heat curing with the generated heat.
It is preferable to have a viscosity of 1 to 40 poise at 20 ° C.

5 is, for example, 200 laminated on the inner surface of the felt layer 4.
An inner layer film tube having a thickness of μm or more,
The inner layer film tube 5 is a film tube 6 formed of a synthetic resin having good light permeability and low water vapor permeability, and a film tube 6 having good light permeability and low gas permeability such as carbon dioxide gas and high heat deformation temperature under load, for example, nylon film. And the film tube 7 formed of the same. The film tube 6 of the inner layer film tube 5 is combined with the inner film tube 7 by a co-extrusion method, and acts as an adhesive layer that is easy to laminate with the felt layer 4, for example, an ionomer having good transparency, elongation and adhesiveness. Resin or the like is used. The one end portion of the lining material 2 thus formed is sealed, and the lining material 2 for inversion shown in FIG. 6 is obtained by reversing the inner layer film tube 5 to the outside with a pressure medium such as air. be able to. Since the felt layer 4 of the lining material 2 thus formed is cured by irradiation with light, it is stored and transported in a sealed container made of an opaque material in a circularly wound or folded state.

Next, a construction process for forming a synthetic resin pipe in the existing pipe 1 using the lining material 2 configured as described above will be described.

As shown in FIG. 1, the tip of the lining material 2 is inverted and fixed to the pressure fluid supply port 8 provided at the end of the existing pipe 1, and the pressure fluid supply port 8 corresponds to the reversal pressure of the lining material 2. Supply low pressure fluid. Due to the pressure difference between the pressure of the pressure fluid and the atmospheric pressure in the existing pipe 1, the reversing portion 9 of the lining material 2 is
Proceed within. Since the pressure of the pressure fluid supplied when the reversing portion 9 advances is low enough to reverse the lining material 2, the lining material 2 is reversed without pressing the inner lining material 2 against the inner surface of the existing pipe. Therefore, the lining material 2 can be inverted and inserted without giving extra resistance, and the lining material 2 can be smoothly and promptly inserted into the existing pipe 1 and penetrated.

After penetrating the lining material 2 into the existing pipe 1 in this way, the tip of the lining material 2 is squeezed as shown in FIG. 2, and this tip is provided with a fluid supply valve 10 and a safety valve 11. Firmly fix the outer circumference of 12 so that fluid does not leak. on the other hand,
The rear end of the lining material 2 passes through the pressure fluid supply port 8 and is fixed to the pressure fluid supply port 8 together with the tip of the reversing hose 13 whose tip is inverted. The reversing hose 13 provided inside the lining material 2 has a length substantially the same as that of the lining material 2 and is made of a synthetic resin film having a good ultraviolet transmission property and a tensile strength, for example, a glass fiber reinforced nylon film, a polycarbonate film or the like. .

After fixing both ends of the lining material 2 as described above, the fluid supply valve 10 provided at the tip of the lining material 2 is opened, and a pressure fluid such as pressurized water is supplied to the inside 14 of the lining material 2 to Is expanded to have an outer diameter of approximately half or more with respect to the diameter direction of the existing pipe 1. Then, the fluid supply valve 10 is closed to keep the inside 14 of the lining material 2 in a sealed state. In this manner, with the lining material 2 inflated by about half, a pressure fluid having a higher pressure than the pressure fluid previously supplied by the fluid supply valve 10 is supplied from the pressure fluid supply port 8 at the rear end of the lining material 2. Then, the reversing hose 13 is reversed and moved into the lining material 2. By reversing and advancing this reversing hose 13, the lining material 2
Are sequentially pressed from the rear end portion to the inner surface of the existing pipe 1, and at the same time, water and air retained between the existing pipe 1 and the lining material 2 are pushed out in the traveling direction. Although the fluid pressure in the inside 14 of the lining material 2 rises due to the reversal / progress of the reversing hose 13, the safety valve 11 opens due to this pressure increase and the increased pressure is released, so the inside 14 of the lining material 2 is always in the safety valve 11 It can be held at a constant pressure determined by.

When the reversing hose 13 is reversing and progressing and the reversing tip portion 15 is inserted up to about half of the lining material 2, the rear end portion 16 of the reversing hose 13 enters the rear end portion of the lining material 2. As shown in FIG. 3, one or a plurality of ultraviolet ray generators 17 are connected in series to the rear end portion 16 of the reversing hose 13 by a cable 18 reinforced in tensile strength.

As shown in the perspective view of FIG.
Two to four ultraviolet ray generating lamps 24, which are, for example, metal halide lamps, are mounted between fixing plates 23 having a plurality of elastic sleds 21 on the outer circumference and connected by reinforcing rods 22. Then, the sled 21 slides on the inner surface of the lining material 2 pressed by the inner surface of the existing pipe 1 to generate an ultraviolet ray generating lamp.
24 is symmetrical with respect to the central axis of the lining material 2.

When the reversing hose 13 is further reversed and advanced, the ultraviolet ray generator 17 is connected to the rear end 16 of the reversing hose 13 and the cable 18
Is inserted into the inside of the lining material 2 pressed against the inner surface of the existing pipe 1, and the lining material 2 is sequentially irradiated with ultraviolet rays from the rear end of the lining material 2 through the reversing hose 13. During this ultraviolet irradiation, the reversing hose 13 is formed of a glass fiber reinforced nylon film or the like having a good UV transmittance, and the inner layer film tube 5 of the lining material 2 also has a good light transmittance, so that the UV is hardly absorbed and the lining is lined. Enter the felt layer 4 of the material 2. In addition, since the outer layer film tube 3 of the lining material 2 has a white color tone, the ultraviolet ray reflection efficiency is good and the hardening of the felt layer 4 of the lining material 2 is promoted to cure the lining material 2 in a short time of about 3 minutes. .

After that, the reversing hose 13 is reversed and advanced at an appropriate speed according to the type and thickness of the UV-curing resin of the lining material 2, and the tip of the lining material 2 is irradiated with ultraviolet rays to cure the lining material 2. After that, the pipe joints 12 and the pressure fluid supply ports 8 at both ends of the lining material 2 are removed, both ends of the lining material 2 are cut, and then the reversing hose 13 and the ultraviolet ray generator 17 are recovered, and the inner surface of the existing pipe 1 is removed. Form a synthetic resin tube that is in close contact with.

In the above embodiment, the ultraviolet ray generator 17 has 2 to 4
The case where the ultraviolet ray generating lamp 24 is provided has been described, but if the existing tube 1 has a small diameter of 300 mm or less, one ultraviolet ray generating lamp 24 may be provided at the center of the fixing plate 23.

[Effects of the Invention] As described above, the present invention corresponds to the lining material whose tip is inverted and fixed to the pressure fluid supply port provided at the end of the existing pipe, and corresponds to the reversal pressure of the lining material from the pressure fluid supply port. Since the lining material is reversed without pressing the inner surface of the existing pipe while supplying low-pressure fluid, the lining material is reversed without giving a pressing force to expand or expand it. It can be smoothly and quickly inserted into the existing pipe.

In addition, a two-stage expansion is performed in which the lining material inserted into the existing pipe is pre-expanded in the diameter direction of the existing pipe, the shape of the lining material is adjusted, and then expanded again from the rear end of the lining material by the reversing hose. As a result, the lining material is pressed against the inner surface of the existing pipe while discharging the water and air accumulated between the inner surface of the existing pipe and the lining material, so that a synthetic resin pipe can be formed without creating a gap between the inner surface of the existing pipe and the inner surface. Can be formed.

Further, since the lining material is expanded in order from the rear end portion of the lining material by the reversing hose to press the lining material against the inner surface of the existing pipe, it is possible to prevent wrinkles and the like from occurring in the pressed lining material.

Furthermore, when irradiating ultraviolet rays to the lining material pressed against the inner surface of the existing pipe to cure it, the ultraviolet rays irradiate the lining material without being absorbed by the reversing hose, which has good ultraviolet transparency, so the lining material can be quickly It can be hardened and the construction time can be greatly shortened.

[Brief description of drawings]

1, 2, and 3 are process diagrams showing the construction process of the embodiment of the present invention, FIG. 4 is a perspective view showing the lining material before inversion, and FIG. 5 is a felt layer of the lining material. FIG. 6 is a perspective view showing the lining material used in the above embodiment, and FIG. 7 is a perspective view showing the ultraviolet ray generator used in the above embodiment. 1 ... Existing pipe, 2 ... Inner lining material, 3 ... Outer layer film tube, 4 ... Felt layer, 5 ... Inner layer film tube, 8 ... Pressure fluid supply port, 10 ... Fluid supply valve, 13 ...
Inverting hose, 17 …… UV generator, 18 …… Cable,
24 …… UV lamp.

Claims (1)

[Claims] 1. A tip of a lining material having a felt layer made of an acrylic resin impregnated with an ultraviolet-curable unsaturated polyester resin is inverted and fixed to a pressure fluid supply port provided at an end of an existing pipe, While supplying a low pressure fluid equivalent to the reversing pressure of the lining material, the lining material is inverted / penetrated into the existing pipe, and the tip of the penetrating lining material is fixed and sealed in the pipe joint with the fluid supply valve to create a pressure fluid. The rear end of the lining material fixed to the supply port is the same length as the lining material and has good UV transparency.It is re-fixed to the pressure fluid supply port together with the folded part of the tip of the reversing hose. After supplying the fluid and pre-expanding the lining material in the diameter direction of the existing pipe, while discharging the pressure fluid supplied from the fluid supply valve, the pressure fluid having a pressure higher than this pressure fluid is supplied to the pressure fluid supply port. And al supplied by inversion and proceed inverted hose into the lining material,
The inversion lining method characterized in that the lining material is sequentially pressed from the rear end portion to the inner surface of the existing pipe, and the inner lining material pressed to the inner surface of the existing pipe is irradiated with ultraviolet rays from an ultraviolet ray generator connected to the rear end of the reversing hose. .