JPH04235022A - Method and apparatus for reversing strip like bag body - Google Patents

Abstract

PURPOSE:To enhance workability using a small-sized container by forming a hermetically closed space partially partitioned by a liquid to pass a strip like bag body through the liquid and allowing the part to be reversed to face to the hermetically closed space and supplying compressed gas into the hermetically closed space to reverse the strip like bag body. CONSTITUTION:When compressed air is supplied into a hermetically closed space S from an air inflow part 5 through piping 7 and a valve 8 by driving a compressor, the internal pressure P of the hermetically closed space S is raised and the water in a chamber S1 receives the internal pressure P to be lowered up to a water level h1, whereas the water in a chamber S2 is pushed up to reach a water level h2 and the water generates head difference DELTAh(=h2-h1). When the internal pressure P of the hermetically closed space S is raised, a strip like bag body 10 receives the internal pressure P to be successively reversed and, with the reversal of said bag body 10, the strip like bag body 10 before reversal arranged outside the container 2 is supplied into the container 2 to pass through the water in the container 2 and reaches the hermetically closed space S to be successively reversed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method and a reversing device for a belt-shaped bag, which are applied to pipe repair methods, manufacturing of belt-shaped bags, and the like.

(Prior Art) A pipeline repair method is already known in which an old pipe buried underground is repaired by lining the inner circumferential surface of the pipe without digging it out. In this method, a liner made of a flexible resin absorbent material impregnated with a curable resin is inserted into a pipe while being inverted by fluid pressure.

(Problem to be Solved by the Invention) By the way, in the above-mentioned pipe repair method, when compressed gas pressure is used as the fluid pressure for reversing the liner, it is necessary to store all of the liner in a closed container, and especially when the liner is When the dimensions are large, there is a problem that the sealed container becomes large.

The present invention has been made in view of the above-mentioned problems, and its purpose is to provide a method and device for reversing a belt-shaped bag, which can reverse the belt-shaped bag with good workability using a small container. There is a particular thing.

(Means for Solving the Problems) In order to achieve the above object, the method of the present invention forms a sealed space, a part of which is partitioned by a liquid, and passes the belt-shaped bag body into the liquid, and the inverted part of the bag is inserted into the sealed space. It is characterized in that the belt-shaped bag body is inverted by supplying compressed gas to the inside of the closed space.

The present invention also provides a container that supports a band-shaped bag that accommodates a liquid and forms a sealed space defined by the liquid inside, and whose inverted portion faces into the sealed space through the liquid; A feature of the present invention is that the reversing device includes a compressed gas supply source that supplies compressed gas into the container.

(Function) According to the present invention, when compressed gas from a compressed gas supply source is supplied into the closed space, the band-shaped bags are turned over one after another under the pressure of the compressed gas, and together with this, the belt-shaped bags are turned over when placed outside the container. The belt-shaped bag before being turned over is supplied into the closed space through the liquid. That is, in the present invention, since a liquid is used as a sealing material to keep the closed space airtight, the band-shaped bag can freely pass through this liquid. Therefore, there is no need to store all the belt-shaped bags in a sealed container as in the past, and most of the belt-shaped bags before being turned over can be placed outside the container. The belt-shaped bag can be turned over with good workability.

Note that a liquid head difference corresponding to the internal pressure of the closed space occurs within the container. Further, depending on the case, a container may be constructed from a part or the front part of the belt-like bag.

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

FIG. 1 is a longitudinal cross-sectional view of a reversing device according to the present invention, and FIGS. 2 and 3 are partial cross-sectional views showing an example of application of the method of the present invention.

First, the basic configuration of the reversing device 1 will be explained based on FIG. There is. A mounting part 4 is opened in the upper part of the side wall of the container 2 on the chamber S1 side, and an air inlet 5 is provided in the upper wall of the container 2 on the chamber S1 side. A compressor 6 is connected via a pipe 7 and a valve 8.

Moreover, the upper part of the chamber S2 side of the container 2 has an opening 2 that opens to the atmosphere.
It constitutes a.

Water supplied from the pipe 9 is stored in the container 2, and the water surface heights in the chambers S1 and S2 are initially maintained at the height h0 shown by the chain line in FIG. There is. A closed space S is formed in the upper part of the chamber S1 of the container 2 by this water.

On the other hand, in FIG. 1, 10 is a long belt-shaped bag, one end of which is inserted into the chamber S1 from the opening 2a of the container 2 as shown in the figure, passes through the water and reaches the chamber S2 side, and then It passes through the sealed space S and extends from the mounting portion 4 into the atmosphere.

Then, the end portion of the band-shaped bag body 10 is turned over and the band 11
It is fixed to the outer periphery of the mounting portion 4 at .

Next, the method of the present invention will be described while explaining the function of the present reversing device 1.

When the compressor 6 is driven and compressed air is supplied into the closed space S from the air inlet 5 through the piping 7 and the valve 8, the internal pressure P of the closed space S increases, and in response to this internal pressure P, the water in the chamber S1 The water in the chamber S2 is pushed down to the illustrated water level h1, and conversely, the water in the chamber S2 is pushed up to the illustrated water level h2, causing a head difference of Δh (=h2-h1).

Note that, assuming that the specific weight of water is γ, the internal pressure P of the closed space S at this time is equal to the pressure γ·Δh based on the water head difference Δh (P=γ·Δh).

When the internal pressure P of the closed space S increases as described above, the band-shaped bag body 10 receives this internal pressure P and turns over one after another and moves in the direction of the arrow shown in the figure. The strip-shaped bags 10 are fed into the container 2, pass through the water in the container 2, reach the closed space S, and are turned over one after another as described above.

As described above, in this embodiment, since water is used as the sealant to keep the closed space S airtight, the band-shaped bag 10
can freely pass through this water. Therefore, there is no need to store all of the band-shaped bag 10 in a sealed container as in the past, and most of the band-shaped bag 10 before being inverted can be placed outside the container 2. Even if the size of the belt-shaped bag 10 is large, the container 2 can be downsized, and by using this small container 2, the belt-shaped bag 10 can be reduced in size.
can be reversed with good workability.

Here, an example of application of the method of the present invention will be explained based on FIGS. 2 and 3.

In the example shown in FIG. 2, in the pipe repair method, the belt-shaped bag body 10 itself constitutes a liner impregnated with a curable resin, and this belt-shaped bag body 10 is buried underground while being inverted by the method of the present invention. It is inserted into the aged pipe 20 that has been removed.

Further, in the example shown in FIG. 3, in the same pipeline repair method, the belt-shaped bag 10 is inserted into a liner 30 drawn in advance into an old pipe 20 while being inverted by the method of the present invention. The liner 30 is expanded by the body 10 and brought into close contact with the inner peripheral surface of the aged pipe 20.

Next, other embodiments of the reversing device are shown in FIGS. 4 and 5, respectively. Note that FIGS. 4 and 5 are longitudinal cross-sectional views of the reversing device, and in these figures, the same elements as shown in FIG. do.

In the embodiment shown in FIG. 4, a container 12 bent in an N-shape is used. Also in this embodiment, a closed space S partitioned by water is formed inside the container 12. If compressed air is supplied from the compressor 6 into the space S, the belt-shaped bag 10 will be reversed by the internal pressure of the closed space S, as in the previous embodiment.

In the embodiment shown in FIG. 5, the belt-shaped bag 10 is bent into an N-shape using a support member 21 and a pressing member 22, and the belt-shaped bag 10 itself is configured as a container. and,
Also in this embodiment, the belt-shaped bag body 10 functioning as a container
A closed space S defined by water is formed inside, and by supplying compressed air from the compressor 6 into this closed space S, the belt-shaped bag 10 can be turned over with good workability.

In the reversing device shown in FIGS. 4 and 5, a water head difference Δh corresponding to the internal pressure of the sealed air S also occurs.

By the way, in the above embodiments, water was particularly used as the liquid, but the internal pressure of the closed space S can be further increased by using a liquid with a higher specific gravity than water (for example, salt water, etc.). Furthermore, by adjusting the water level to send water into the inverted belt-shaped bag 10, the belt-shaped bag 10 before being inverted will proceed floating in this water, making the inversion work more smooth. can be done.

(Effects of the Invention) As is clear from the above description, according to the present invention, when compressed gas from a compressed gas supply source is supplied into a closed space, the belt-shaped bag body is inverted one after another under the pressure of the compressed gas. At the same time, the belt-shaped bag placed outside the container before inversion passes through the liquid and is supplied into the closed space, so it is not necessary to store all the belt-shaped bags in the sealed container as in the past. The advantage is that the belt-shaped bag can be inverted with good workability using a small container.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a reversing device according to the present invention, FIGS. 2 and 3 are partial sectional views showing an example of application of the method of the present invention, and FIGS. 4 and 5 are other embodiments of the reversing device. FIG. 1... Reversing device, 2, 12... Container, 6... Compressor (
compressed gas supply source), 10...band-shaped bag body, S...closed space. Patent applicant: Shigeru Endo, patent attorney: Ryoichi Yamashita

Claims (3)

[Claims] Claim 1: Forming a sealed space, a part of which is partitioned by a liquid, passing a band-shaped bag into the liquid so that its inverted part faces into the sealed space, and supplying compressed gas into the sealed space. A method for inverting a band-shaped bag, characterized in that the band-shaped bag is inverted by: 2. A container that supports a band-shaped bag that accommodates a liquid and forms a sealed space defined by the liquid, and an inverted portion of the bag passes through the liquid and faces into the sealed space; 1. A belt-shaped bag reversing device comprising a compressed gas supply source that supplies compressed gas into a container. 3. The device for reversing a band-shaped bag according to claim 1, wherein a part or all of the band-shaped bag constitutes the container.