JPH03151225A - Lining technique - Google Patents

Abstract

PURPOSE:To enable lining of the inside of an existing pipe reliable and easy, by a method wherein a resin pipe formed of thermoplastic resin or shape memory resin into the outside diameter of almost the same size as a bore diameter of the existing pipe is softened within a heating atmosphere of a temperature of a softened stage sphere, a sectional area is processed narrow and flat and a lining material is formed. CONSTITUTION:A lining material 1 processed flat so that a sectional area becomes narrow by softening a resin pipe formed of thermoplastic resin and shape memory resin into the outside diameter of almost the same size as a bore diameter of an existing pipe by softening the resin pipe is held under a softened state within a heating and heat insulating tank 2. The lining material 1 under a softened state is introduced into a molding cylinder 8 and molded into a U-shaped state having an external form smaller than a bore diameter of an existing pipe by introducing the softened lining material 1 into a molding cylinder 8. Then the U-shaped lining material 1 is pulled continuously within the existing pipe with a traction rope while fixing the U-shaped form by cooling the lining material 1. Then after cutting of both ends of the lining material, a heating fluid of a temperature falling within a softening sphere of the resin pipe is fed continuously within the lining material and the form is restored to a circular form while softening the lining material. With this construction, a synthetic resin pipe having a uniform thickness can be formed reliably and easily within the existing pipe.

Description

[Detailed description of the invention] [Industrial use! )] This invention, S, sewage) 6. This relates to a lining method that can be applied to all existing pipes, including water supply pipes and oil pipes.

[Conventional technology] In recent years, the lining method of lining the inner surface of existing pipes with synthetic resin has been gaining attention for the purpose of reinforcing the strength of existing pipes such as sewerage and water supply pipes, preventing corrosion, preventing water leakage and flooding, or changing the flow rate calendar. For example, Japanese Patent Publication No. 63-2853
One method disclosed in Publication No. 95 is to first reduce the diameter of the existing pipe to 5
A thermoplastic synthetic resin tube having a diameter of 0 to 70% is flattened.

This flattened resin tube is inserted over the entire length of the existing pipe, and while the heating vig is moved from the starting end to the terminal end within the resin tube, the heating vig and the heated pressurized air supplied forward from the heating vig are used to heat the resin chino and -bubble. This is a construction method in which a synthetic resin pipe is formed within an existing pipe by expanding it in the radial direction.

Also, JP-A-64-16632, JP-A-64-1
The construction method disclosed in Publication No. 6633 involves inserting a thermoplastic synthetic resin pipe with a diameter of 1 mm into an existing pipe, heating the thermoplastic synthetic resin pipe from the outside, and expanding it by heating and pressurizing it from the inside. This is a method in which the resin pipe is brought into close contact with the inner surface of the existing pipe.

Furthermore, Japanese Patent Application Laid-open No. 1 204725 discloses a construction method using a lining material made by flattening a hard hose into which a porous hose is inserted over the entire length of the inside and winding it into a roll. This construction method uses steam supplied to a porous hose to heat and soften the hard tube while li! J!
This is a method in which a hard tube is inserted into an existing pipe, and the inserted hard tube is expanded with a fluid L to tightly fit inside the existing pipe.

[Problems to be solved by the invention] As described above, in the conventional method of heating, softening, and expanding heat-resistant synthetic resin with a diameter smaller than the existing pipe diameter, the synthetic resin pipe is heated, softened, and expanded during softening and expansion. Same pressure due to resin temperature difference 1
; The difference in elongation rate is large, and when heated, it becomes an amorphous state, and the self-expansion force is small, so it cannot be forcibly expanded and expanded significantly by external pressure. For this reason, it is necessary to uniformly heat both the circumferential and longitudinal directions of the existing pipe and the resin pipe under the same pressure. However, in reality, the heating temperature varies and the stretching distance is long, resulting in wrinkles in the resin tube and variations in tube thickness.

Also, JP-A-63-285395 and JP-A-64-
As shown in Publication No. 16632, etc., the lining material is a thermoplastic synthetic resin pipe that is in a hardened state before being inserted into the existing pipe, which limits the means of transportation to the construction site and increases the construction area. , and had disadvantages such as short construction distance.

Furthermore, as shown in Japanese Patent Application Laid-Open No. 1-204725,
When a softened thermal RJJ plastic synthetic resin pipe is towed and inserted into an existing pipe, the synthetic resin pipe stretches in the longitudinal direction and uneven thickness occurs, making long-distance construction difficult. In addition, if the entire synthetic resin pipe is uniformly expanded using fluid pressure to form a lining layer, air and accumulated water will be drawn in between the existing pipe and the lining layer, and the lining layer will be removed from the existing pipe joints and at the welds. This invention has the disadvantage that it comes in contact with protrusions such as, and other foreign matter deposited in the pipe, causing partial scratches and abnormal elongation, resulting in weakening of the strength.
The purpose is to develop a lining method that can reliably and easily line the inner surface of existing pipes.

[Means for Solving the Problems] The lining method according to the present invention is a method for lining a resin pipe formed with thermoplastic resin or shape memory (porridge fat) to have an outer diameter approximately the same as the diameter of the existing pipe. The lining material is formed by flattening it so that it softens in a heated atmosphere and has a smaller cross-sectional area.

This lining material is held in a softened state in a heated heat insulating tank with heated pressure fluid at the temperature of the softening region of the resin pipe, and the softened lining material is passed through a guide hose connected to the lining material removal l of the heated heat insulating tank. , 1 of the molded cylinder. J-shaped ii
c;', Introduce the existing pipe and form it into a 0-shape with a diameter smaller than the diameter of the existing pipe.The lining material formed into a tJ-shape is cooled in a molding cylinder to fix the U-shape. The letter-shaped lining material is continuously pulled inside the existing pipe using a pull rope. After that, both ends of the drawn lining material are cut, and heated fluid at a temperature of the softened region of the resin pipe forming the lining material is continuously supplied inside the lining material, thereby restoring the shape of the lining material from a U-shape to a circular shape. shall be.

[Function] In this invention, lj is thermoplastic ff1P! : A resin pipe made of resin or shape memory resin to have the same outer diameter as the existing pipe diameter is softened and flattened to reduce the cross-sectional area, and the lining material is kept in a softened state in a heating and insulating tank. Then, this softened lining material is introduced into a forming tube and formed into a U-shape with an outer diameter smaller than the diameter of the existing pipe, and the lining material formed into a 0-shape is cooled (to form a J-shape). While fixing it, the U-shaped lining material is continuously drawn into the existing pipe using a rope.After cutting both ends of the drawn lining material, a heated fluid at the temperature of the softening region of the 1m fat pipe is poured into the inside of the lining material. A synthetic resin pipe with a uniform thickness is formed in the existing pipe by continuously supplying the lining material to soften it and restore the shape from a single-shape to a circular shape.

[Embodiment] FIG. 1 is a cross-sectional view showing an embodiment of the invention of item 5. In the figure J3, l is the lining material, and the lining material l is the example
It is made of thermoplastic synthetic resin such as vinyl chloride, polyethylene, polypropylene, and bolybdenum. As shown in Figure 2, this lining material 1 has a diameter of 90-1 with respect to the inner diameter of the existing pipe.
Extrusion molding is performed to have an outer diameter of 0.05% to form a resin pipe la having the length of the long side of the existing pipe.

Next, when the resin pipe 1a is made of vinyl chloride, for example, it is softened in a heated atmosphere with a heat processing temperature of 80 to 1400G, and then processed by a mechanical method such as a forming roller or an extrusion slit, as shown in FIG. Form the lining material l by flattening it so that the cross-sectional area becomes smaller. This lining material 1 is processed into the final form of a circular roll or a folded state, and then cooled and stored.
The pipe 3 is connected to a guide hose 4, and the return pipe 5 is connected to a boiler 7 via a return hose 6.

Reference numeral 8 denotes a molded cylinder connected to the tip of the guide hose 4, and the molded part (on the molded part) includes a heating cylinder 9 and a cooling cylinder 10 whose diameters are enlarged at the part 1-1, as shown in the cross-sectional view of FIG. are integrated with a partition wall 11 in between. A U-shaped cylinder 12 (not shown in the perspective view of FIG. 5), which is formed into a J-shaped U-shape, is inserted and fixed into the heating cylinder 9 and the cooling cylinder 10. At the tip of this LJ cylinder 2 on the side where the heating cylinder 9 is connected to the guide hose 4,
As shown in the perspective view of the heating tube 9 and the cooling tube 10 separated in FIG. There are 2
Also, a supply pipe 14 for supplying heating fluid is attached to the heating cylinder 9 (↑), and as shown in the cross-sectional view in FIG. On the other hand, a refrigerant supply pipe IES and a refrigerant iυ line pipe 17 are attached to the cooling cylinder 10.
A side wall 18 is provided at the end, and at 11 a cooling chamber 19 is formed in the cooling chamber IO, as shown in the side elevational view of sH.

20 is a cooling system that supplies refrigerant to the cooling cylinder 10.Next, as shown in FIG. Composite with existing pipes 21 such as pipes and communication cable protection pipes!
! To explain the operation when forming fat pipes, first, the lining material l processed into a circular roll etc. is placed in a heated heat insulating tank 2.
A heating and heat-insulating tank 2 is installed near the manhole 22.A boiler 7 and a cooling device 20 are also installed adjacent to this heating and heat-insulating tank 2.

Next, the guide hose 4 communicating with the heating and heat-retaining tank 2 is inserted into the manhole 22, and the heating cylinder 9 of the forming cylinder 8 is connected to its tip. At this time, heat and soften the tip of the lining material 2 and insert it into the existing pipe 21 in advance.
- Means such as sewing with the end of the pull helt 31 (・Inner lining 4・
4 Take out [1 case is kept close to 6.

On the other hand, the heating fluid of boiler 1 [J23 and heating cylinder 1]
Supply 'iii and J to pressure hose 24 and valve 25:
The return pipe 5 of the heating and insulation tank 2 and the 11J of the boiler 7 are connected together.
, 026, etc. are connected by a return hose 6.

In addition, the refrigerant supply pipe 16 and refrigerant return pipe 17 of the cooling cylinder 10 of the forming cylinder 8 are connected to the refrigerant hose 27° 28 and the valve 29, respectively.
8. In this state, heated pressure fluid is supplied from the boiler 7. As a general rule, the heated pressure fluid has a softening temperature of 1
When the temperature is 00 oc or less, steam alone or a mixed fluid of steam and hot water is used, and when the temperature is 100 oc or less, hot water or hot water is used.The heated pressure fluid is heated to a specified temperature range. While controlling νj 17, pressurize hose 246 heating tube 9
．． The guide hose 4 is continuously supplied to the circulation system consisting of the heating insulation tank 2 and the return hose 6 to soften the guide hose 4 and the lining material l present in the heating insulation tank 2. At this time, the softened lining material l is heated. Expansion and expansion are suppressed by the pressure of the pressure fluid.

On the other hand, the cooling system 20 continuously supplies refrigerant whose temperature is controlled to be, for example, 60'C or less, to the ring system consisting of the refrigerant hose 27, 28, valves 29, 301', 5, and the cooling cylinder 10. In this way, the cooling chamber 19 of the cooling cylinder 1 () is maintained at a temperature below the hard temperature. The refrigerant used here usually contains a lot of water, but depending on the construction situation. :Liquid nitrogen, liquefied carbon dioxide, etc. discharged from a cylinder or the like may be used.

When the traction belt 31 is pulled toward the distal end of the existing pipe 21 in this state, the inside of the guide hose 4 becomes flexible as shown in the cross-sectional view of the guide hose portion in FIG. 9, but it becomes flat and crushed. The lining material l moves along the 'P-width formed bottom plate 13 in the heating cylinder 9, follows the shape of the preformed bottom plate 13, and deforms from a flat plate state to a U-shape. After the lining material l is formed into a substantially U-shape, it is introduced into the U cylinder 12 and passed through the heating chamber 15 of the heating cylinder 9, as shown in the cross-sectional view of FIG. Shaped as shown.

The lining material l continues to maintain the same shape and is inserted into the cooling cylinder 1.
0, and as it passes through the cooling chamber 19, it is cooled down to below the hard state temperature by the refrigerant, and the U-shape is hardened and fixed, forming the uJ-shaped lining material l. Since the outer diameter of the lining material 1 formed into a square shape is smaller than the inner diameter of the existing pipe 21 as shown in the cross-sectional view of FIG. 11, it can be easily drawn into the existing pipe 21.

Continuously performing the above steps, the cured L-shaped lining material 1 is inserted over the entire length of the existing pipe 21, and the portions protruding from both pipe ports of the existing pipe are cut and removed.

Next, a case will be described in which the inserted lining material l is used to line the inner surface of the existing pipe 21.

First, pipe 1 of the existing pipe 21. ``,'', U 21 The U-shaped lining material l end portion at a is heated to a temperature above the softening temperature using a burner or the like, and the U-shape is formed into a circular shape. An expansion jig 32 made of, for example, silicone rubber foam and having an outer diameter slightly larger than the inner diameter of the existing pipe 21 and a hemispherical tip is inserted into the end of the lining material 1 formed into a circular shape. As shown in FIG. 12, the expansion jig 32 has a through hole 33 extending n along the central axis, and the tip of the through hole 33 is open (the other end is connected to a steam rubber hose 34 of JIS K6335, for example). The other end of the rubber hose 34 is connected to a heating device (not shown).

In this state, for example, 80 to 140°
A heating fluid having a temperature of C is sent to the expansion jig 32 through the heating hose, and is discharged from the tip of the expansion jig 32. As a result, a heating space 35 is formed on the inner surface of the lining material of the expansion jig 32. Then, the tJ-shaped lining material l corresponding to the heating space 35 gradually softens.

It expands and expands to form a lining layer 36 that comes into close contact with the inner surface of the existing pipe 21. The situation at this time is shown from the cross-sectional direction of the tube.
The result will be as shown in FIGS. 13(a) to (d).

Here, FIG. 13(a) shows the U-shaped lining material 1 that is still hardening, and there is a considerable space between the lining material 1 and the existing pipe 21, and FIG. 13(b) shows the lining material 1 expanding. (C) shows a state where the expansion has proceeded further. As the expansion of this lining material 1 progresses, the lining material 1 comes into close contact with the existing pipe 21 as shown in (U). In this state, expansion jig 3
When UF and advancing fluid are supplied from the rear of 2, the heating space 35
Due to the shape recovery force of the lining material l due to the temperature of the heating fluid sent to the heating fluid and the propulsion force of the expansion jig 32, the heating space 35 expands to the existing pipe 21 while discharging air and accumulated matter inside the existing pipe 21.
The lining 136 is formed on the inner surface of the existing pipe 21 by sequentially bringing the lining material 1 into close contact with the inner surface of the pipe. A discharge hole 42 with a stop valve (not shown) is provided in the expansion jig 32.

By advancing the expansion jig 32 to the distal end of the existing pipe 21 in this manner, the lining layer 36 can be formed on the entire inner surface of the existing pipe 21.

In addition, as shown in FIG. 14, by providing a flexible expansion jig 37 made of a heat-resistant material such as polytetrafluoroethylene resin at the tip of the expansion jig 32, the contact area of the flexible expansion jig 37 between the lining + 41 can be reduced. Take a large space to create heating space 3.
It is also possible to increase the lining speed by increasing the external force for expanding the lining material 1 by decreasing the value of 5.

In addition, when constructing an existing pipe 21 over a short distance, without using the expansion jig 32, heated pressure fluid is released and supplied directly to the inner surface of the U-shaped lining material 1 to change the shape of the lining material 1. By making the lining layer 3 in the existing pipe 21
6 can be formed 9 In addition, in the embodiment described in "-", a case will be described in which the lining material 1 is formed into a U-shape by the heating cylinder 9 of the forming cylinder 8 and the U1 tray 12 provided in the cooling cylinder 10. However, a forming roller may be provided in the forming cylinder 8 to form the lining material 7. Figure 15 shows an example of the case where a forming roller is provided in the forming cylinder 8. A semi-cylindrical preformed bottom plate 38 is fixed to the artificial part of the cylinder 8, and a first forming roller 39 is provided on this preformed bottom plate 38. A large second forming roller 40 is provided. Then, as shown in Figure 16,
First, the center of the softened lining N1 is lightly pressed against the preformed bottom plate 38 using the first forming roller 39 to partially form it.
Next, as shown in FIG. 17, the lining material 1 is pressed with a second forming roller 40 so that the contact area between the lining material 1 and the preformed bottom plate 38 becomes larger, and the lining material 1 is shaped into a U-shape. The lining material l formed into a U-shape in this way
is cooled in the cooling cylinder 10 to harden and fix, and this lining material l is inserted into the existing pipe 21.

In addition, in the above embodiment, a case has been described in which the lining material l is formed into a U-shape using the forming cylinder 8, but as shown in FIG. You can make it smaller.

In each of the above embodiments, the lining material l was made of thermoplastic resin, but the resin pipe was made of a block copolymer of polystyrene and crystallized polybutadiene, for example.
Asahi Kasei-tama (mM), h-lance polyisoprene (manufactured by Kuraray)
;! Even when formed with a shape memory resin such as a polyurethane resin (manufactured by Mitsubishi Heavy Industries, Ltd.), the same effect as in the embodiment described above can be obtained.

As shown in Fig. 2, the lining material l using shape memory resin is made by extrusion molding the shape memory resin into a pipe shape in a heated atmosphere at a shape memory temperature of, for example, 120 DC or higher, and then A resin pipe la is formed by memorizing a shape having an outer diameter of 98 to 120%. Next, while softening the resin pipe la in a heated atmosphere having a rubber-like region temperature ranging from a shape mouth 1N temperature of, for example, 90°C or higher, to a temperature below the shape memory temperature, the molding roller and extrusion sleeve 1-
The lining material l is flattened to have a smaller cross-sectional area as shown in Figure 3 by mechanical methods such as Cool and store below shape recovery temperature''4-
9 This lining material l is inserted into the existing pipe in the same manner as in the above embodiment, and the shape is restored.
1. ! It is possible to form an N-sized synthetic resin pipe.

[Effect of the invention J This invention! , Jl: As explained, thermoplastic resin or shape-memory fδl resin is formed to have an outer diameter approximately the same as the existing pipe diameter, softening the resin pipe and reducing the cross-sectional area. The flattened lining material is kept in a softened state in a heating and insulating tank, and this softened lining material is introduced into a molded tube to form a tube with an outer diameter smaller than the existing pipe diameter.
The lining material formed into a letter 0 shape is cooled and formed into a U shape.
Since the U-shaped lining material is continuously drawn into the existing pipe using the indexing rope while fixing the shape, there is almost no longitudinal elongation when the lining material is indexed and inserted into the existing pipe, and the length of the lining material is reduced. Even during distance construction, uneven thickness can be prevented during insertion.

In addition, heating fluid having a temperature in the softening region of the resin pipe is continuously supplied into the lining material inserted into the existing pipe, softening the lining material, and J
Second, since the shape is restored from a U-shape to a circular shape, a synthetic resin pipe of uniform thickness can be formed inside the existing pipe, and a synthetic resin pipe with uniform strength and less cross-sectional area loss can be formed inside the existing pipe. Can be lined.

In addition, since the U-shaped lining (A) is softened and the shape is sequentially changed from a U-shape to a circular shape (ν) to form a synthetic resin pipe within an existing pipe, wrinkles that occur inside the inner surface of the curved pipe and air that occurs on the outside. , there is less entrainment of accumulated water, and there is less local elongation due to steps at existing pipe joints, making it possible to form good synthetic resin pipes. Since it is a self-supporting synthetic resin pipe that adheres closely to the existing pipe, there is no need to expect it to adhere to the existing pipe.Therefore, the existing pipe does not require intermediate or high-grade surface treatment, and harmful protrusions that may form inside the existing pipe are avoided. All that is required is to remove particles and accumulated substances, and the pretreatment of existing pipes can be simplified.

Furthermore, the lining material can be easily formed into a U-shape in a molding cylinder, and a synthetic resin pipe can be formed by simply turning the molded 750-shaped lining material into a circular shape. It does not require a long time to cure and cool a curable resin, and can be applied in a short period of time.

In addition, since it is only necessary to restore the lining material, whose original outer diameter is approximately the same as the inner diameter of the existing pipe, to a circular shape, the pressure of the heated pressurized fluid to restore the circular shape is not required to be very high, which improves safety during construction. can be increased.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG.
FIG. 3 is a perspective view showing the lining material, FIG. 4 is a cross-sectional view of the molded cylinder, and FIG. 5 is a perspective view showing the U cylinder. Fig. 6 is a perspective view showing the heating cylinder and cooling cylinder of the forming cylinder separated, Fig. 7 is a sectional view of the heating cylinder 2, Fig. 8 is a sectional view of the cooling cylinder 1, and Fig. 9 is a sectional view of the cooling cylinder 1. A-A sectional view in the figure, Figure 1O is B-13 in Figure 1
11 is a sectional view taken along the line C-C in FIG.
), (b), (c), and (ci) are cross-sectional views showing changes in the shape of the lining material during construction, Figure 14 is a cross-sectional view showing another example of the expansion jig, and Figure 15 is a cross-sectional view showing changes in the shape of the lining material during construction. 16, 17, and 18 are cross-sectional views showing a part of a molded cylinder according to another embodiment.
Each figure is a sectional view showing a molded state of the lining material according to the embodiment shown in FIG. 15, and FIG. 19 is a sectional view showing another molded state of the lining material. 1: Lining material, 2: Heating insulation tank, 7: Boiler, 8: Forming tube, 9: Heating tube, lO: Cooling tube, 12: U tube, 13: Preformed bottom plate, 20: Cooling device, 21: Existing pipe , 32: Expansion jig, 33: Through hole, 34: Rubber hose for steam, 37
: Flexible expansion jig, 38: Preformed bottom plate, 39: First forming roller, 40: Second forming roller.

Claims (1)

[Claims] A resin pipe made of thermoplastic resin or shape memory resin and having an outer diameter that is approximately the same as the diameter of the existing pipe is softened in a heated atmosphere having a temperature in the softening region, so that the cross-sectional area becomes smaller. A flat lining material is formed, and the lining material is held in a softened state in a heated heat-insulating tank containing heated pressure fluid at a temperature of the softened region of the resin pipe, and the softened lining material is held in a heated heat-insulating tank. The lining material is introduced into the U-shaped tube of the molding tube through the guide hose connected to the lining material outlet and formed into a U-shape with an outer diameter smaller than the diameter of the existing pipe, and the lining material formed into the U-shape is introduced into the molding tube. While cooling and fixing the U-shape, the U-shaped lining material is continuously drawn into the existing pipe using a rope, and after cutting both ends of the drawn lining material, the temperature of the softened region of the resin pipe is maintained inside the lining material. A lining construction method characterized by continuously supplying heated fluid to restore the shape of the lining material from a U-shape to a circular shape.