JPH01127320A - Tubular lining material and repairing technique of duct line - Google Patents

Abstract

PURPOSE:To apply a desired lining to the inner circumference of a timeworn pipe even if the pipe is thick, by a method wherein the tubular lining material constituted of a flexible resin absorbing material by infiltrating curable resin into the same is made a multi-layer structure of two layers or more and at least the outermost layer obtained after inversion is wetted with a curing accelerator. CONSTITUTION:A tubular lining material 1 to be used possesses double round pipe structure constituted of a first layer 1a and second layer 1b under a state where the material 1 has been inserted within a timeworn pipe 5 through inversion. At the time of application of this technique, the first layer 1a comprised by wetting the first layer 1a with curing accelerator (a matter obtained by diluting naphthenic acid cobalt with a styrene monomer) beforehand is folded up and prepared on the ground. Then an end of the same is introduced within an inversion guide 3 and fixed to the circumference of an opening part 3a of the inversion guide 3 with a band 19 by bending the same outward. Then when compressed air is fed within the inversion guide 3 from a pipe 13 through a valve 15, the second layer 1b is inserted within the first layer 1a and at the same time the second layer 1b is pressed against the inner circumferential surface of the first layer 1a. In this instance, a part of normal temperature curing resin infiltrated into the second layer 1b is infiltrated into the first layer 1a in order effectively.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a tubular lining material for lining the inner circumferential surface of an aged pipe and a pipe repair method using the same.

(Conventional technology) When sewer pipes, electric/gas pipes, and other industrial pipes buried underground become obsolete, it is possible to line the inner surfaces of these pipes without digging them out. Pipeline repair work for repairing, reinforcing, etc. the aging pipe concerned is disclosed in Japanese Patent Application Laid-Open No. 60-24203.
(Refer to Publication No. 8), this pipe repair method involves inverting a tubular lining material made of a flexible resin absorbing material whose surface is coated with a film and impregnating a hardening resin into an old pipe using fluid pressure. The tubular lining material is then heated, etc. to harden the curable resin impregnated into the tubular lining material, thereby forming a rigid lining pipe around the inner periphery of the aging pipe. This is a method of forming and lining.

However, when a thermosetting resin is used as the curable resin in the above construction method, hot water at a high temperature (approximately 90"C) is required to heat and harden it, and a boiler truck or the like is installed at the site for work. There were problems in that it took time and money to obtain hot water using a boiler truck, and that handling high-temperature hot water was not easy and was dangerous. When lined with
Although the lining material is heated to a high temperature, the old pipe remains at room temperature, and a large temperature difference occurs between the two. is larger than that of the old pipe), which causes distortion in the lining material, and this distortion causes problems such as cracks in the lining material.

Therefore, we decided to use a curable resin instead of a thermosetting resin.
We use a room-temperature-curing resin that hardens at a temperature of 40'''C to 509°C during actual work.
A method of increasing the curing speed by heating with hot water of C is proposed.

(Problems to be Solved by the Invention) However, according to the above method, when the thickness of the tubular lining material is thin (specifically, when the thickness is 12 mm or less), the tubular lining material is impregnated. The room-temperature curing resin is heated sufficiently and hardens completely, but when the thickness of the tubular lining material increases (specifically, when the thickness exceeds 15 mm), the heat from the hot water can cause the tubular lining material to harden. There is a problem in that the resin does not reach the vicinity of contact with the peripheral wall of the aged pipe, and therefore the room temperature curing resin does not completely harden, making it impossible to provide the required lining.

The present invention has been made in view of the above problems, and its purpose is to completely cure the curable resin impregnated into the resin even if the thickness is large, and to provide the required lining to the inner periphery of the aging pipe. An object of the present invention is to provide a tubular lining material that can be used for cleaning and a pipe repair method using the same.

(Means for Solving the Problems) In order to achieve the above object, the present invention uses two tubular lining materials.
It is characterized in that it has a multilayer structure of more than one layer, and that at least the outermost layer after one inversion is wetted with a curing accelerator.

In addition, in the present invention, a tubular lining material made of a flexible resin absorbing material impregnated with a curable resin is inserted into an old pipe while being inverted by fluid pressure, and then the tubular lining material is impregnated with a curable resin. In the pipe repair method in which the curable resin is cured to line the inner peripheral surface of the aged pipe, the tubular lining material has a multilayer structure of two or more layers, and the first layer of the tubular lining material is Wet the curing accelerator and insert it into the old pipe while inverting it, and then invert and insert the second and subsequent layers impregnated with a curable resin into the first layer, and cure the layers impregnated with this. The curable resin is impregnated into the first layer, and finally the curable resin impregnated into all layers of the tubular lining material is cured.

(Function) Therefore, the tubular lining material is composed of two or more layers, and at least the outermost layer (the layer in contact with the inner circumferential wall of the aged pipe) after the inversion.
Since the curing accelerator is wetted by
' C ~ 50 @ C) Even if the tubular lining material is thick, the curable resin in the layers except the outermost layer will be sufficiently cured by heating with hot water, and the outermost layer will be cured. The curable resin will be sufficiently cured by the action of the curing accelerator even if heated with hot water for only a short time. In this way, the tubular lining material is completely cured even if it is thick, and as a result, the required lining is applied to the inner peripheral surface of the aged pipe, and the aged pipe is completely repaired.

(Example) An example of the present invention will be described below based on the accompanying drawings.

Figures 1 to 3 are cross-sectional views showing the construction method of the present invention in the order of its steps, and Figure 4 is a cross-sectional view taken along the line IIV-■ in Figure 3. To explain based on Figure 1, in the figure, 3 is a reversing guide installed vertically in a manhole 4, and the lower end opening 3a of the reversing guide 3 opens into an old pipe 5 such as a sewer pipe as shown in the figure. ing. Further, an insertion guide 6 having an oval opening is provided at the center of the upper surface of the reversing guide 3. A rubber gasket 7 is inserted into the interior of the insertion guide 6, and the upper end of the gasket 7 is inserted into the insertion guide 6. The portion is folded back to the outside and fixed to the outer periphery of the upper end portion of the insertion guide 6 with a band 8, and the lower end portion hangs down and protrudes into the inside of the reversing guide 3. On the outer circumferential side of the part of this packing 7 facing inside the reversing guide 3, another packing 9 is provided which is fixed with a band 10 to the upper end thereof or to the lower outer periphery of the insertion guide. 9 constitutes a sealing mechanism. Note that a guide roller 11 is provided at a lower bent portion within the first reversing guide 3.

On the other hand, an air compressor 12, which is a compressed air supply device, is installed on the ground. A pipe 13 led out from the discharge side of the air compressor 12 opens into the reversing guide 4, and this pipe 13 has a pressure gauge. 14 and a valve 15 are provided. Further, another pipe 16 is opened inside the reversing guide 3, and the internal pressure of the reversing guide 3 is set to a predetermined value (in this embodiment, I kg/c).
A relief valve 17 is provided which opens when reaching "g".

Therefore, the tubular lining material l used in the construction method of the present invention consists of a first layer 1a and a second layer ib when it is inverted and inserted into the aged pipe 5, as described later (see Fig. 4). It has a double circular pipe structure, and when implementing the method of the present invention, the first layer La is pre-wetted with a curing accelerator (for example, cobalt naphthenate diluted with styrene monomer) as shown in Figure 1. It is folded and prepared on the ground, and one end passes through the guide roller 18 to the insertion guide l of the reversing guide 3.
=:6 is introduced into the reversing guide 3 through a packing 7 provided inside the reversing guide 3, and is further reversed to the outside and fixed to the periphery of the opening 33 of the reversing guide 3 with a band 19.

In such a state, if the air compressor 12 is driven to supply compressed air at a predetermined pressure from the pipe 13 through the valve 15 into the reversing guide 3, the first layer 1a will be reversed under the pressure of this compressed air. At the same time as being inserted into the aged pipe 5, it is pressed against the inner circumferential wall of the aged pipe 5. At the same time, the first layer 1a prepared on the ground is moved by the guide roller 18.
The lubricating oil is sprayed from the injector 20 into the first layer 1a to reduce the sliding friction between the first layer 1a and the packing 7. Sprayed on the outer periphery.

In this way, when the reversal and insertion of the first layer La is completed over the entire length of the aged pipe 5, a sufficient amount (a sufficient amount including the amount to be impregnated into the first layer 1a) of the room-temperature curing resin is impregnated in advance. The second layer lb is prepared as shown in FIG. 2, and one end thereof is introduced into the reversing guide 3 through the guide roller 18 and through the packing 7 provided inside the insertion guide 6 of the reversing guide 3. This is further bent outward and fixed to the periphery of the opening 3a of the reversing guide 3 with a band 19. after that.

If the air compressor 12 is driven in the same manner as described above and compressed air is supplied from the pipe 13 through the valve 15 into the reversing guide 3, the second layer lb receives the pressure of this compressed air and is reversed, while the first layer La The first one is inserted inside
It is pressed against the inner circumferential surface of layer 1a, and at this time, a part of the cold-setting resin impregnated into second layer tb is impregnated into first layer La in order. At this time, if the inside of the first layer La is kept in a negative pressure state by the vacuum pump 30 as shown in the figure, the room temperature curable resin can be impregnated into the first layer La more effectively.

Thus, when the reversal and insertion of the second layer lb is completed over the entire length of the aged pipe 5 (first layer 1a) as shown in FIG. 3, the inner peripheral surface of the aged pipe 5 becomes the cross-sectional view shown in FIG. As shown in Fig. 1, the above-mentioned No. 191a and the second layer lb are covered with a tubular lining material l having a multilayer structure, and No. 191a is covered with a room-temperature curable resin while moistened with a curing accelerator. The second layer lb is impregnated with a room-temperature curable resin.

Thereafter, as shown in FIG. 3, hot water of approximately 40'''C to 50°C is supplied from a tank truck 21 installed on the ground into the reversing guide 3 through a pipe 23 by a water supply pump 22. The water supply pump 22 raises the pressure to a predetermined pressure (a pressure higher than the set pressure (l Kg/cm) of the relief valve 17).

Then, the compressed air that has been filled in the reversal guide 3 and the tubular lining material l after reversal is released into the relief valve 1.
7 to the atmosphere, and the compressed air is replaced by hot water, but when this replacement is completed and the inside of the reversing guide 3 and the tubular lining material l after being reversed are filled with warm water, the reversing guide 3 and The pressure inside the tubular lining material l is the set pressure of the relief valve 17 (l Kg/C■”g)
The tubular lining material l remains pressed against the inner circumferential wall of the aged pipe 5 as shown in the figure.

However, the tubular lining material 1 has a multilayer structure consisting of a layer 1m 1a and a second layer lb, and in particular, the first layer 1a is moistened with a curing accelerator, so even if it is thick, , the room temperature curable resin impregnated in the second layer lb that comes into direct contact with hot water is heated by this warm water and sufficiently cured, and the room temperature curable resin impregnated in the first Mla outside of the second layer tb is cured. Even if the water is not sufficiently heated, the first
The room temperature curable resin impregnated into the first layer 1a is sufficiently cured by the action of the curing accelerator moistened with Jij 1a. In this way, even if the tubular lining material l is thick, it will be completely cured by the action of the hardening accelerator, and as a result, the inner peripheral surface of the aged pipe 5 will be provided with the required lining and the aged pipe will be completely cured. 5 will be completely repaired.

In addition, in the method of the present invention, hot water at a relatively low temperature of 40°C to 50°C is used to cure the curable resin, so there is no need for boiler equipment, etc., which was required in the past, and hot water can be obtained. can save time and energy for
This makes it possible to shorten the construction period and reduce costs. In addition, since hot water is used as a means of increasing the curing speed of the room-temperature curing resin, the work can be carried out with extremely good work efficiency without any danger, and the temperature difference between the aged pipe 5 and the tubular lining material l can be reduced. Since the amount of strain is small, no large strain occurs inside the tubular lining material 1, and therefore, problems such as cracks do not occur in the tubular lining material 1. Furthermore, the tubular lining material 1 The temperature of the hot water used to pressurize and heat the material rises slightly (approximately 5°C) due to the reaction heat generated when the room temperature curing resin hardens, so the temperature of this hot water does not drop. , it is reasonable to be able to use this many times.

Incidentally, in the above embodiments, the tubular lining material l is made up of two layers, but it is clear that the same effects as described above can be obtained even if the tubular lining material l has a multilayer structure made up of three or more layers.

(Effects of the Invention) As is clear from the above description, according to the present invention, the tubular lining material has a multilayer structure of two or more layers, and the first layer of the tubular lining material is moistened with a curing accelerator. is inserted into the aged pipe while being inverted, and then the second and subsequent layers impregnated with curable resin in advance are inverted and inserted into the first layer, and the curable resin impregnated with this is inserted into the first layer. The lining is applied to the inner circumferential surface of the old pipe by impregnating it with a hardening resin that has been impregnated into the entire layer of the tubular lining material, and then curing the curable resin that has been impregnated into the entire layer of the tubular lining material, so even if the tubular lining material is thick, The effect is that the curable resin impregnated with this can be completely cured and a required lining can be applied to the inner periphery of the aged pipe.

[Brief explanation of the drawing]

1 to 3 are cross-sectional views showing the construction method of the present invention in the order of its steps, and FIG. 4 is a cross-sectional view taken along the line 1'V-ff in FIG. 3 (a cross-sectional view of the tubular lining material according to the present invention). l... Tubular lining material, la-first layer, 1b-...
2nd layer, 5...Old pipe, 12-...Air compressor, 21-...Tank truck, 22-...Water pump.

Claims (2)

[Claims] (1) A tubular lining material made by impregnating a flexible resin absorbent material with a curable resin is inserted into an old pipe while being inverted by fluid pressure, and then the curable resin impregnated into the tubular lining material is The tubular lining material is used in a pipe repair method in which the inner peripheral surface of an aged pipe is lined by curing a resin, and has a multilayer structure of two or more layers, and at least the outermost layer is hardened after inversion. A tubular lining material characterized by being moistened with an accelerator. (2) A tubular lining made of a flexible resin absorbent material impregnated with a curable resin is inserted into an old pipe while being inverted by fluid pressure, and then the curable resin impregnated into the tubular lining material In a pipe repair method in which the inner circumferential surface of an aged pipe is lined by curing the tubular lining material, the tubular lining material has a multilayer structure of two or more layers, and a curing accelerator is applied to the first layer of the tubular lining material. Moisten it and insert it into the aged pipe while turning it over. Then, turn over and insert the second layer and subsequent layers, which have been pre-impregnated with a curable resin, into the first layer to absorb the curable resin impregnated therein. A pipe repair method characterized by impregnating a curable resin into the first layer and finally curing the curable resin impregnated into the entire layer of the tubular lining material.