JPH03230942A - Sealing device for lining material in lining device of duct - Google Patents

Abstract

PURPOSE:To completely seal the circumference of lining material in a sealing device and to prevent pressure fluid in a pressure vessel from being leaked out by pressure-welding a cylindrical film or an airtight cylinder to the lining material by the pressure of fluid. CONSTITUTION:The tip of a pressure vessel 2 is joined to the terminal of a duct 1. A sealing device 3 is joined to the rear part of the pressure vessel 2 as an introduction part of lining material. An air-tight and soft cylindrical film 17 has circumferential length sufficiently larger than the circumferential length of lining material 4. This lining material 4 is inserted into the cylindrical film 17. When pressure fluid having pressure higher than the pressure of fluid in the pressure vessel 2 is introduced from the introducing port 16 of pressure fluid, the pressure of fluid acts on the interval between a cylinder 10 and the cylindrical film 17. This cylindrical film 17 is pushed on the lining material 4 and thereby the inside of the pressure vessel 2 is interrupted from the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a device for lining a pipeline, and in particular, a lining material is inserted from the rear of a pressure vessel, and the tip of the lining material is inserted into the pressure vessel. Annularly and airtightly fixed at the tip, fluid pressure is applied within the pressure vessel to extrude the lining material from the tip, and at the folded portion formed there, the lining material is turned over so that the inside becomes the outside. In the lining device, the folded part enters into the pipe, and the turned-over lining material is pressure-contacted with the inner surface of the pipe for lining. The present invention relates to a device for preventing pressure fluid from leaking from the introduction portion and maintaining fluid pressure within a pressure vessel.

Prior Art Conventionally, when lining a pipe, a cylindrical flexible lining material is turned inside out using fluid pressure so that the inside becomes the outside. A method of lining the pipe by pressing a material against the inner surface of the pipe is known.

This method can line long pipes of several hundred to several thousand meters in a short time by excavating only both ends of the pipe, and has attracted particular attention in recent years as an extremely superior method. ing.

By the way, in this method, the lining material is wound into a coil shape and stored in the pressure vessel, and the tip of the lining material is fixed to the tip of the pressure vessel and the inside-out progresses from there. Two methods are known: placing the lining material outside the pressure vessel, passing the lining material through the pressure vessel while drawing it out, and fixing the tip of the lining material to the tip of the pressure vessel to line the pressure vessel.

According to the former method, the structure of the pressure vessel is simple, but since all the lining material must be housed within the pressure vessel, there are restrictions on the length of the pipe that can be lined due to the size of the pressure vessel. In particular, there is a drawback that the pressure vessel must be large in order to line a long pipe line. On the other hand, according to the latter method, the lining material is placed outside the pressure vessel, so the pressure vessel can be made small, and there is no restriction on the length of the pipe that can be lined, and there is no limit to the length of the pipe. It is also possible to line the inside.

However, on the other hand, it requires an opening for introducing the lining material into the rear part of the pressure vessel, and it is difficult to seal around the lining material passing through the opening. If the seal is incomplete, the pressurized fluid inside the pressure vessel will gush out from the rear opening, causing severe noise, making it impossible to carry out construction work at night, especially in residential areas.

If a sealing device capable of completely sealing the lining material inlet in the lining material penetration type lining device is provided, it is thought that the range of application of this lining material penetration type lining device will be greatly expanded. .

As a sealing device proposed from this point of view,
The one described in JP-A-108719 is known. This product is equipped with a sealing part consisting of a pair of rubber air bags that sandwich the lining material at the lining material introduction part of the pressure vessel, and compressed air is injected into these air bags to cause the lining material to expand. is sandwiched from both sides to create an airtight seal.

Problems to be Solved by the Invention However, in this tram, it is fine when the lining material is stopped and the inside of the pressure vessel is not pressurized, but when the inside of the pressure vessel is pressurized, the air A force acts on the bag outward from the pressure vessel, and when the lining material enters the pressure vessel from the rear of the pressure vessel as the lining progresses, friction with the lining material causes the air bag to move toward the inside of the pressure vessel. Power works.

When these forces act on the air bag, the air bag is distorted in the direction of those forces, reducing its adhesion to the lining material and causing the compressed air inside the pressure vessel to easily leak, especially in this device. , when the air bag is distorted, there is no action to restore the distortion, and air leakage cannot be stopped.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a sealing device that can completely seal the introduction opening of the lining material in the lining device of the lining material penetration type. be.

As a means for solving the problem, the first invention of the present application inserts a lining material from the rear part of the pressure vessel, and fixes the tip of the lining material in an annular and airtight manner at the tip of the pressure vessel. Fluid pressure is applied inside the container to extrude the lining material from the tip, and at the folded part formed there, the lining material is turned over so that the inside becomes the outside, and the folded part is entered into the pipe line, and the folded part is turned inside out. In a lining device that presses and lines a pipe lining material against the inner surface of a pipe, both ends of an airtight flexible cylindrical membrane having a circumference sufficiently larger than the circumference of the lining material are The cylindrical membrane is airtightly attached to the inside of the lining introduction part at the rear of the pressure vessel, with the central part being loose at small intervals, and tapered surfaces opening inward are formed at the front and rear of the cylindrical membrane. The lining material is inserted into the membrane, and a fluid pressure greater than the fluid pressure that should be applied to the pressure vessel during lining is applied between the cylindrical membrane and the lining material introduction part, and the cylindrical membrane is pressed against the lining material surface. This is characterized by maintaining airtightness inside the pressure vessel.

Another invention of the present application is to insert a lining material from the rear of the pressure vessel, fix the tip of the lining material in an annular and airtight manner at the tip of the pressure vessel, and apply fluid pressure inside the pressure vessel. The lining material is extruded from the tip, and at the folded part formed there, the lining material is turned over so that it is either inside or outside, and the folded part is entered into the pipe, and the turned lining material is placed on the inner surface of the pipe. In a lining device for lining the lining by pressure contact, an open part forms a pair of vortices facing each other at right angles to the traveling direction of the lining material inside the lining material introduction part at the rear of the pressure vessel, and opens on the front and rear surfaces of the groove. A slightly tapered surface is formed in the direction in which the part opens,
A flexible airtight cylinder with both ends sealed is fitted into the groove, and a lining material is pushed between the airtight cylinders, and the fluid pressure that is to be applied to the pressure vessel when lining the airtight cylinder is exceeded. It is characterized in that a large fluid pressure is applied to press the airtight cylindrical body against the surface of the lining material to maintain airtightness within the pressure vessel.

Example Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 illustrates a situation in which the present invention is used to line a conduit.

Reference numeral 1 denotes a conduit, the end of which is connected to the tip of a pressure vessel 2, and the sealing device 3 of the present invention is connected to the rear of the pressure vessel 2 as a lining material introduction section.

The lining material 4 is placed on a reel 5 installed at the rear of the sealing device 3.
The lubricant is wound in a flat state, unwound from the reel 5, sent forward by a caterpillar device 6, and sprayed with lubricant by a spray device 7 in front of the caterpillar device 6.

The lining material 4 passes through the sealing device 3 from behind and enters the pressure vessel 2, and its tip is fixed annularly and airtight between the pressure vessel 2 and the pipe line 1.

Here, when the inside of the pressure vessel 2 is kept airtight by the sealing device 3 and the pressure fluid is pressurized into the pressure vessel 2 from the pressure fluid pressure inlet 8, the lining material 4 is turned over so that the inside becomes the outside, and the folded part 9 advances inside the pipe line 1, and the turned-over lining material 4 is pressed against the inner surface of the pipe line 1 by fluid pressure and is lined. It is.

FIG. 1 shows an embodiment of a sealing device 3 of the present invention. In this sealing device 3, 10 is a cylindrical body whose inner surfaces at both ends are formed into gently tapered surfaces 1111', and 12.12' is a cylinder whose outer surface at its tip fits into the tapered surface 11.11'. Tapered surface 13.1
3" and has a tapered surface 14.14 that opens on the inside as well.
' This is a presser metal fitting.

A flange 15 for coupling to the pressure vessel 2 is formed on the front presser fitting 12', and the cylindrical body 10
A pressure fluid inlet 16 is provided in the holder.

Reference numeral 17 denotes an airtight flexible cylindrical membrane having a circumferential length sufficiently larger than that of the lining material 4 .

Then, both ends of this cylindrical membrane 17 are connected to the tapered surface 11.11' of the cylindrical body 10 and the tapered surface 13 of the holding fitting 12.12'.
．． 13' and tighten, and 1. The middle part is greatly loosened.

The structure of the cylindrical membrane 17 is preferably a thin cylindrical woven fabric with a rubber or synthetic resin film formed on the outer surface to provide airtightness.

When the lining material 4 is inserted into the cylindrical membrane 17 and a pressure fluid with a pressure higher than the fluid pressure in the pressure vessel 2 is inserted from the pressure fluid inlet 16, the gap between the cylindrical body 10 and the cylindrical membrane 17 is Fluid pressure acts on the cylindrical membrane 17 to crush it and press it against the lining material 4, thereby sealing off the inside of the pressure vessel 2 from the outside.

4 and 5 show other embodiments of the sealing device 3 of the present invention. In this embodiment, a pair of grooves 19, 19 with open portions facing each other are formed inside the sealing device main body 18 at right angles to the direction of movement of the lining material 4. The front and rear surfaces of the grooves 19, 19 are inclined in the direction in which the open portion opens to form tapered surfaces 14, 14', and a flexible airtight cylinder 20, 20 with both ends sealed in the grooves 19, 19, respectively. are mated.

The structure of the airtight cylinder 20.20 is preferably one in which an airtight film of rubber or synthetic resin is formed on the inner surface of a thin cylindrical woven fabric, similar to the structure of the cylinder M17 in Example 2. .

Both ends of the airtight M body 20.20 are closed with plugs 21.21, and one of the plugs 20 is fitted with a pressure fluid inlet 16.16.

When a pressure fluid with a pressure higher than the fluid pressure in the pressure vessel 2 is inserted from the pressure fluid inlet 16, the airtight cylinder 20.
20 expands and comes into close contact with the lining material 4, keeping the inside of the pressure vessel 2 airtight.

Operation According to the invention, the cylindrical membrane 17 or the airtight cylinder 20.20
is held down by tapered surfaces 1414' at the front and back, and will not be excessively deformed even if it is pushed backward by the fluid pressure in the pressure vessel 2 or dragged forward by friction with the lining material 4. Therefore, the sealing action of the sealing device 3 is maintained.

Further, FIG. 2 shows a state 3 in which the cylindrical membrane 17 is dragged by the lining material 4 and deforms forward in the first embodiment. In this state, the tapered surface 14
．． 14' is inclined, the rear part of the cylindrical membrane 17 is released from the tapered surface 14 in the range a, and is pushed rearward by the fluid pressure between the cylindrical membrane 17 and the cylinder body 10. On the other hand, in the front part of the cylindrical membrane 17, the area free from the tapered surface 14' is as small as a2, and the force pushed forward by the fluid pressure is small.

Therefore, due to the difference in force between the rear portion and the front portion of the cylindrical membrane 17, a rearward force acts on the cylindrical membrane 17, and this force acts in a direction to recover the deformation.

As the degree of deformation increases, the difference between al and a2 increases, and accordingly, the force that attempts to recover from the deformation also increases.

In addition, when the lining material 4 does not move, the cylindrical membrane 1
7 deforms toward the rear due to the pressure inside the pressure vessel 2, but in this case, al becomes smaller than a2, and the fluid pressure between the cylindrical body 10 and the cylindrical membrane 17 causes the cylindrical membrane 17 to deform toward the rear. A force is applied to the body, which acts in the direction of recovering the backward deformation.

4. Although the above description has been made regarding the first embodiment, the second embodiment is also completely similar, and the airtight cylinder body 20.
When the airtight cylindrical body 20.20 is deformed due to the fluid pressure within 20, it works to recover the deformation.

Effect of the invention Therefore, according to the present invention, the cylindrical membrane 17 or the airtight cylinder 20
．． 20 is pressed against the lining material 4 by fluid pressure, the area around the lining material 4 in the sealing device 3 is completely sealed, and the pressure fluid in the pressure vessel 2 does not leak backward, thereby preventing an unnecessary large amount of pressure fluid from leaking backwards. It does not require any pressure fluid and does not generate excessive noise.

Further, according to the present invention, as described above, since the cylindrical membrane 17 or the airtight cylinder 20.20 is supported in the front and back direction by the tapered surfaces 14, 14', the cylindrical membrane 17 or the airtight cylinder 20.
．． When 20 is deformed, a force is exerted to recover the deformation, and this force increases with the size of the deformation.

Therefore, even if the cylindrical membrane 17 or the airtight cylindrical body 20, 20 is deformed by being dragged due to the fluid pressure in the pressure vessel 2 or the movement of the lining material 4, there is always a force that tries to recover the deformation. This prevents excessive deformation and prevents the sealing action of the lining material 4 by the sealing device 3 from being impaired.

In the present invention, the cylindrical membrane 17 or the airtight cylinder 20.2
0 may be a single layer, or by using a layer of two or more layers, even if the outermost layer wears out and loses its airtightness, it will continue to function due to the airtightness of the inner layer. This is preferable because it can be done. Further, if the inner body of the cylindrical membrane 17 or the airtight cylindrical body 20 or 20 is made thicker, the flexibility will be impaired, but it is preferable to stack thinner membranes in multiple layers because this will not impair the flexibility.

Furthermore, by doubling the cylindrical membrane 17 or airtight cylinder 20.20 and providing separate pressure fluid inlets 16 on the outside and inside, the cylindrical membrane 17 or airtight cylinder 20.20 is first placed on the outside.
20 is inflated and used, and if it wears out and loses its airtightness, the inner cylindrical membrane 17 or the airtight cylindrical body 20.20 can be inflated to continue its function.

[Brief explanation of drawings]

FIG. 1 is a central vertical cross-sectional view showing one embodiment of the sealing device of the present invention, and FIG. 2 is a central vertical cross-sectional view showing a state in which a force toward the right in the figure is applied to the cylindrical membrane in FIG. It is a diagram. FIG. 3 is a central longitudinal sectional view conceptually showing a pipe lining device using the present invention. FIG. 4 and FIG. 5 are a central longitudinal sectional view and a transverse sectional view showing another embodiment of the sealing device of the present invention. 1... Pipe line 2... Pressure vessel 3... Seal device 4... Lining material 9... Turned part 14... ... Tapered surface 17 ... Cylindrical membrane 19 ...
・・Sei 20・・・・Airtight cylindrical body

Claims (1)

[Claims] 1. A lining material (4) is inserted from the rear of the pressure vessel (2), and the tip of the lining material (4) is fixed in an annular and airtight manner at the tip of the pressure vessel (2); Fluid pressure is applied inside the pressure vessel (2) to extrude the lining material (4) from the tip, and at the folded part (9) formed there, the lining material (4) is turned over so that the inside becomes the outside. In a lining device in which the folded part (9) enters the pipe (1) and the turned-over lining material (4) is pressure-contacted to the inner surface of the pipe (1) for lining, the inner surface of the lining material (4) is The pressure vessel ( 2) Install the cylindrical membrane (1
7) has a tapered surface (14,
14') and a lining material (17) inside the cylindrical membrane (17).
4) is inserted, and a fluid pressure greater than the fluid pressure that should be applied to the pressure vessel (2) during lining is applied between the cylindrical membrane (17) and the lining material (4) introduction part, and the cylindrical membrane (1
Lining material sealing device 2 in a pipe lining device, characterized in that the lining material (7) is pressed against the surface of the lining material (4) to maintain airtightness inside the pressure vessel (2). The material (4) is inserted, the tip of the lining material (4) is annularly and airtightly fixed at the tip of the pressure vessel (2), and fluid pressure is applied inside the pressure vessel (2) to remove the lining material. (4) from the tip, and while turning the lining material (4) inside out so that the inside becomes the outside at the folded part (9) formed there, insert the folded part (9) into the pipe (1). In a lining device for lining a lining material (4) that has been introduced and turned over by pressure contact with the inner surface of a pipe (1), an open part is formed inside the introduction part of the lining material (4) at the rear of the pressure vessel (2) and mutually A pair of opposing grooves (19) are formed at right angles to the advancing direction of the lining material (4), and tapered surfaces (14, 14') are formed on the front and rear surfaces of the grooves (19) and are inclined in the direction in which the opening opens. A flexible airtight cylinder (20, 20) with both ends sealed is fitted into the groove (19), and the airtight cylinder (20, 20)
), insert the lining material (4) between the airtight cylinders (20, 2
A fluid pressure greater than the fluid pressure that should be applied to the pressure vessel (2) during lining is applied to the inside of the pressure vessel (2), and the airtight cylinders (20, 20) are brought into pressure contact with the surface of the lining material (4). 2) A lining material sealing device for a pipe lining device, which is characterized by maintaining airtightness inside.