WO2021010169A1

WO2021010169A1 - Method for inverting lining material

Info

Publication number: WO2021010169A1
Application number: PCT/JP2020/025898
Authority: WO
Inventors: 達人高嶋
Original assignee: 株式会社湘南合成樹脂製作所
Priority date: 2019-07-18
Filing date: 2020-07-01
Publication date: 2021-01-21
Also published as: TW202120301A; JPWO2021010169A1

Abstract

According to the present invention, compressed gas from an air compressor 56 is supplied into an inversion container 1, and an inversion pressure of a lining material 60 is formed by a gas pressure due to the compressed gas. A liquid 40 is caused to overflow from an inversion nozzle 12 and is supplied into the lining material 60, and the inversion pressure is formed by the pressure of the liquid. The inversion pressure due to the gas pressures is formed while supplying the liquid into the lining material, and the lining material is inverted by the pressures of the gas and the liquid. Even when the total length of the lining material to be inverted is increased, it is possible to effectively perform the inversion by the compressed gas.

Description

How to invert the lining material

The present invention relates to a method in which one end of a tubular lining material is attached to a reversing nozzle provided in an airtight reversing container to form a reversing pressure in the reversing container to invert the lining material into an existing pipe.

Conventionally, when an existing pipe such as a sewer pipe buried in the ground has deteriorated, the inner surface of the existing pipe is lined with a lining material in which a resin absorbent material made of a tubular flexible non-woven fabric is impregnated with a curable resin. , The existing pipe is being rehabilitated.

When the lining material is inverted and inserted into the existing pipe, a lining material reversing device is used. In Patent Document 1 below, the lining material is wound into a roll and stored in a closed storage container, one end of the lining material is folded back and attached to an inversion nozzle, and compressed air is supplied to the storage container to invert the lining material. The configuration is described.

In Patent Document 2 below, after installing a tower with a reversing nozzle mounted on a manhole, a lining material is attached to the reversing nozzle, water is injected into the pipe lining material from an injection hose, and the lining material is placed in the existing pipe by water pressure. The configuration for reverse insertion is described.

In Patent Document 3 below, after drawing a lining material of a certain length into a chamber provided with a reversing nozzle and a lining material inlet and outlet, the inlet is closed, the outlet is opened, and compressed air is introduced into the chamber. The configuration is described in which the lining material is inverted by feeding it into the air. In this configuration, after the lining material of a certain length is inverted and inserted into the existing pipe, the outlet is sealed, the inlet is opened, and a new lining material of a certain length is drawn into the chamber, and the above-mentioned operation is performed. By repeating the above steps, the lining material is continuously inverted and inserted into the existing pipe.

Japanese Unexamined Patent Publication No. 2006-205722 Japanese Unexamined Patent Publication No. 10-11989 Special Table 2012-516251

In the configuration of Patent Document 3, the lining material can be inverted without being limited by the length by alternately repeating drawing and inversion of the lining material. However, in this configuration, the longer the reversing lining material is, the larger the space to be airtight is, so there is a problem that a large reversing pressure must be formed.

As described in Patent Document 1, when the lining material is inverted by air pressure, a large air compressor is required to increase the inversion pressure, and the larger the air pressure, the stronger the inversion container. It is necessary to improve the airtightness.

On the other hand, as described in Patent Document 2, when the reing material is inverted using water pressure, it is necessary to increase the head in order to increase the water pressure, and it is necessary to assemble a tall tower at the site. , There is a problem.

The present invention has been made to solve such a problem, and provides a method for reversing a lining material that can be effectively reversed by a compressed gas even if the total length of the lining material to be reversed becomes long. The task is to do.

The present invention
A method in which one end of a tubular lining material is attached to a reversing nozzle provided in an airtight reversing container to form a reversing pressure in the reversing container to invert the lining material into an existing pipe.
The process of supplying the compressed gas into the reversing container and forming the reversing pressure by the atmospheric pressure of the compressed gas.
It has a step of supplying a liquid into a lining material and forming a reversal pressure by the hydraulic pressure.
It is characterized in that a reversing pressure due to atmospheric pressure is formed while supplying a liquid into the lining material, and the lining material is reversed by the atmospheric pressure and the hydraulic pressure.

In the present invention, the hydraulic pressure reversal is performed in addition to the pneumatic reversal, so that the enclosed space required for the pneumatic reversal is reduced, and even if the lining material has a long overall length, the lining material can be effectively used with a small air compressor. Can be inverted. Further, even when the lining material having a long overall length is inverted, the inversion is performed while supplying the liquid, so that the resistance in the pipe of the lining material can be reduced. Further, after the inversion is completed, the liquid in the lining material can be used for heating and curing the lining material, so that the curing time of the lining material can be shortened.

It is a perspective view which shows the appearance of the reversing device of a lining material. It is sectional drawing of the reversing container along the line AA of FIG. It is explanatory drawing which shows the state which the lining material is inverted and is inserted into the existing pipe. It is a perspective view of a lining material. It is sectional drawing of the lining material which was folded flat and seen along the line BB of FIG. 4a. It is explanatory drawing which shows the state which the shower hose is connected to the end of a lining material. It is explanatory drawing which showed the state which controlled the liquid level in a reversing container. It is explanatory drawing which shows the state which the lining material is inverted by hydraulic pressure and is inserted into an existing pipe. It is explanatory drawing which shows the state which the lining material is inverted by pneumatic pressure and is inserted into an existing pipe. It is explanatory drawing which shows the state which the lining material is inverted by the air pressure and the hydraulic pressure, and is inserted into an existing pipe. It is a block diagram which shows the structure of another Example of the lining material reversing device. It is explanatory drawing which shows the state which inverts a lining material by air pressure using the inversion device of FIG. It is explanatory drawing which shows the state which inverts a lining material by air pressure and hydraulic pressure by using the inversion device of FIG.

Hereinafter, examples of the present invention will be described with reference to the attached drawings. The present invention is suitable for reversing the lining material used when rehabilitating an existing pipe buried in the ground such as a sewer pipe, a water pipe, and a communication cable pipe.

FIGS. 1 to 3 show a lining material reversing device including a reversing container 1 for reversing the lining material. The reversing container 1 is a metal pressure-resistant container and includes a hollow cylindrical portion 10. A reversing nozzle 12 is attached to the upper part of the reversing container 1 via a side pipe 11. The reversing nozzle 12 is attached by airtightly connecting the flange 12a of the reversing nozzle 12 and the flange 11a of the side pipe 11 by fixing means of a plurality of bolts and nuts (both not shown). The small circles drawn on the flanges or disks in each figure indicate the holes through which the bolts pass.

Below, it is said that bolting or bolting is the process of airtightly connecting and fixing the two members with bolt and nut fixing means. A packing member may be interposed to ensure an airtight connection. Since the two bolted members are separated by removing the bolts and nuts, it also means that the two members are detachably and airtightly connected.

On the side opposite to the side pipe 11 of the reversing container 1, the side pipe 13 extends in the opposite direction to the side pipe 11, and the disk 14 is bolted to the flange 13a. The disk 14 has a gas supply port 15 for supplying gas supplied from a compressed gas source described later, a hot water supply port 16 for supplying hot water for curing the lining material after the inversion work is completed, and hot water being discharged. A hot water discharge port 17 is attached. Further, below the side pipe 13, a liquid supply port 18 for supplying an incompressible liquid, which will be described later, into the reversing container 1 is attached.

A disk-shaped cover 21 provided with a mounting pipe 20 is bolted to the flange 10a of the cylindrical portion 10 on the upper part of the reversing container 1, and the disk 22 is bolted to the flange 20a of the mounting pipe 20.

At the lower part of the reversing container 1, an opening 2 is provided in which a lining material can be inserted and an opening through which the lining material contacts and passes is provided. The opening 2 has, for example, an opening member 30 made of MC nylon having good slippage or a metal (for example, stainless steel) polished to have good slippage. The opening member 30 is formed with a slit-shaped opening 31 extending in the horizontal direction having a width and a height corresponding to the cross-sectional shape of the flattened lining material 60.

As shown in FIGS. 4a and 4b, the lining material 60 is a lining material obtained by impregnating a resin absorbent material 60a made of a tubular flexible non-woven fabric with a curable resin and coating the outer surface with an airtight plastic film 60b. is there. A plastic fiber, a glass fiber, or the like is used as the material of the non-woven fabric, and the curable resin is a thermosetting resin such as an unsaturated polyester resin or an epoxy resin, or a thermosetting resin, or a thermosetting resin and a photocurable resin. A resin mixed with a resin is used. The resin absorbent 60a may be formed in multiple layers instead of one layer.

As shown in FIG. 4c, the end of the lining material 60 forms an airtightly sealed sealing portion 60c. Further, a shower hose 63 is attached to the sealing portion 60c via a connector 62. The shower hose 63 has a large number of ejection holes, and is guided into the existing pipe as the lining material 60 is inverted, and the lining material 60 in the existing pipe is cured by the hot water shower ejected from the ejection holes.

As shown in FIG. 4b, the width of the opening 31 of the opening member 30 is the same as or slightly larger than the width when the lining material 60 is flattened, and the height of the opening 31 is the thickness of the flattened lining material. It is set to be almost the same as or slightly larger than. As a result, the lining material 60 can smoothly pass through the opening 31. At this time, an unavoidable gap is created between the opening 31 and the lining material 60 passing through the opening 31. As will be described later, the reversing container 1 is filled with an incompressible liquid, for example, water, so that when a high pressure is applied to the liquid, the reversing container 1 passes through this gap or a portion where the liquid is not sufficiently in contact with the liquid. Leaks out from. In order to prevent this outflow and improve the liquid sealing property, the opening 31 is shaped so that the flow path area of the liquid flowing through the gap is as small as possible, that is, the flow path resistance is increased. As described above, the opening member 30 has a function of smoothly passing the lining material and a sealing function of preventing the liquid from leaking through the opening 31, and can also be called a sealing member.

The number of opening members may be one, but in order to improve the sealing property and to prevent the lining material 60 from meandering, the opening 31 having the same shape as the opening 31 is placed on the reversing container 1 side adjacent to the opening member 30. An opening member 30'with a'is provided. The opening members 30 and 30'are aligned so that the openings 31 and 31'are aligned and the lining material passes through, and are bolted to the mounting plate 32.

Since the sealing portion 60c of the lining material 60, the connecting tool 62, and the shower hose 63 are all small in thickness, they can pass through the openings 31, 31'of the opening members 30, 30'.

The mounting plate 32 of the opening 2 is bolted to the flange 33a of the rectangular conduit 33 extending into the reversing container 1, and the lining material 60 passes through the opening members 30, 30'and the conduit 33 into the reversing container 1. Be guided.

As shown in FIGS. 2 and 3, a guide roller 25 which is bearing by a bearing 24 and freely rotates is provided inside the reversing container 1, and a guide roller 27 which is supported by a bearing 26 and freely rotates below the guide roller 25. Is provided. The lining material 60 passing through the openings 31 and 31'is guided by the

guide rollers

27 and 25, one end 60d thereof is folded back, and the band 61 airtightly attaches the lining material 60 to the reversing nozzle 12 (FIG. 3).

As shown in FIG. 3, the reversing container 1 is arranged in a liquid tank 41 that stores an incompressible liquid 40, for example, water or hydraulic oil used for flood control equipment, in a vertically standing state. A guide roller 43 bearing by a bearing 42 is provided in the liquid tank 41, and the lining material 60 is introduced into the liquid tank 41 and then guided by the guide roller 43 in the direction of the opening 2 of the reversing container 1. Be taken. Further, a liquid discharge port 44 for discharging the liquid 40 in the liquid tank to the outside is attached to the lower portion of the liquid tank 41.

A fluid device for supplying the liquid 40 into the reversing container 1 is arranged outside the liquid tank 41. In this embodiment, for example, a pressure pump 50 is used as the fluid device. The discharge port of the pressure feed pump 50 is connected to the liquid supply port 18 of the reversing container 1 via the pipe 51 and the flow rate adjusting valve 52, and the suction port is connected to the liquid discharge port 44 of the liquid tank 41 via the pipe 53 and the joint 54. Connected to. By driving the motor 55, the pressure feed pump 50 pumps the liquid 40 in the liquid tank 41 through the liquid discharge port 44 and the pipe 53, and from the discharge port via the pipe 51, the flow rate adjusting valve 52, and the liquid supply port 18. The liquid is supplied into the reversing container 1.

A compressed gas source for supplying compressed gas, for example, compressed air, compressed carbon dioxide, or the like is arranged in the vicinity of the liquid tank 41. In this embodiment, an example in which compressed air is used as the compressed gas will be described, so that the air compressor 56 is used as the compressed gas source. The air compressor 56 supplies compressed air to the upper part of the liquid 40 in the reversing container 1 via the pipe 57, the flow rate adjusting valve 58, and the gas supply port 15. A barometer 59 is attached to the upper part of the gas supply port 15 to measure the atmospheric pressure of the supplied compressed air.

A liquid level gauge 45 for measuring the level of the liquid 40 in the reversing container 1 is attached to the reversing container 1. FIG. 5 shows a liquid level gauge 45 in the shape of a pipe 45a made of, for example, a transparent acrylic resin. One end of the pipe 45a is airtightly attached to the upper part of the reversing container 1 and the other end to the lower part thereof so as to communicate with the inside of the reversing container 1. A float 45b to which a magnet is attached is provided in the pipe 45a, and a magnetic sensor 45c is attached to the outside of the pipe 45a.

The reversing container 1 is filled with the liquid 40 up to a predetermined level 40a exceeding the openings 31 and 31'. When the lining is started, compressed air is supplied to the upper part of the liquid 40 of the reversing container 1, and the air pressure generated by the compressed air acts on the liquid 40 so that the liquid 40 has a gap between the opening of the opening 2 and the lining material 60. It flows out from the reversing container 1 to the liquid tank 41 through the liquid tank 41. When the liquid 40 falls below the level 40a due to this outflow, the decrease is detected by the magnetic sensor 45c. At that time, the pump 50 is driven via the drive circuit 65 to maintain the liquid 40 at the level 40a.

The liquid tank 41 has a structure that allows the liquid 40 at the same level as or lower than that level to be stored in the liquid tank 41 when the liquid 40 in the reversing container 1 is maintained at a predetermined level. ing.

Next, the process of inverting the lining material using the lining material reversing device configured in this way will be described. The reversing container 1, the liquid tank 41, the pressure pump 50, the air compressor 56, and the like are mounted on a loading platform of a work truck (not shown) and transported to the site in the state shown in FIG. Is moved to a position where it comes on the manhole 66 continuous with the existing pipe 67 to be lined (FIG. 3). A bent pipe 69 is provided below the manhole 66 in order to smoothly guide the lining material into the existing pipe 67.

As shown in FIG. 3, the lining material 60 is guided to the reversing nozzle 12 via the

guide rollers

43, 27, 25, one end 60d thereof is folded back, and the band 61 is airtightly attached to the reversing nozzle 12. In the present invention, the length of the lining material is not limited to 60, and the lining material can be continuously inverted and inserted into the existing pipe. Therefore, the lining material can be rolled up or folded by a required length. Store in a storage container and mount the storage container on the work truck.

Subsequently, the liquid 40 is supplied into the liquid tank 41, the flow rate adjusting valve 52 is fully opened, the pressure feed pump 50 is driven, and the liquid 40 is inverted to a level exceeding the openings 31, 31'of the opening members 30, 30'. Supply to. The level of the liquid 40 in the reversing vessel 1 is maintained at level 40a.

Since the hot water supply port 16 and the hot water drain port 17 of the reversing container 1 are not used when reversing the lining material, they are airtightly closed with

caps

16a and 17a so as not to leak air (FIG. 3). .. The part to be bolted in the reversing container 1 is airtight, and after the lining material 60 is airtightly attached to the reversing nozzle 12, the inside of the reversing container 1 is separated into a gas space and a liquid space, and is above the liquid 40. An airtight closed space is formed in.

In this state, the flow rate adjusting valve 58 is fully opened to drive the air compressor 56, and compressed air is supplied to the airtight closed space of the reversing container 1. As shown by the solid arrow in FIG. 3, the compressed air acts on the reversing nozzle 12 as a reversing pressure, so that the lining material 60 attached to the reversing nozzle 12 is outside the reversing container 1 as shown by the virtual line. It is inverted and discharged, and is inserted into an existing pipe 67 such as a sewage pipe via a bent pipe 69 via a manhole 66.

Since a slight gap is generated between the lining material 60 and the opening of the opening 2, the compressed air acts on the liquid 40, so that the liquid 40 flows out of the reversing container 1 and the liquid 40 drops below the level 40a. To do. Every time the liquid level falls below the level 40a, the pump 50 is driven for a predetermined time, and as shown by the dotted arrow, the liquid 40 in the liquid tank 41 is sucked out and replenished in the reversing container 1. The liquid in 1 will be kept at approximately level 40a. Therefore, the compressed air can be continuously used for reversing the lining material, and the lining material can be continuously reversed without being limited by the length of the lining material.

The reversal efficiency of the lining material 60 depends on the smoothness of the lining material 60 as it passes through the opening of the opening 2 and the sealing function of preventing the liquid 40 from flowing out from the gap between the lining material 60 and the opening. .. The smoothness of the opening 2 and the sealing function are contradictory functions. In order to improve the smoothness, for example, when the opening is enlarged, the smoothness is increased, but the gap is increased and the sealing function is lowered. On the other hand, if the opening is made smaller, the sealing function is improved but the smoothness is lost.

In this embodiment, in order to improve smoothness, MC nylon having good slippage or a metal polished to have good slipperiness (for example, stainless steel) is used as the material of the opening members 30 and 30'. There is. Further, curved portions are formed in the openings 31 and 31'to reduce the frictional resistance of the lining material 60 when passing through the openings. On the other hand, in order to enhance the sealing function, not only the opening member 30 but also the opening member 30'is provided to double the sealing function.

By using the reversing device as described above, the lining material can be inverted and inserted into the existing pipe without being limited by the length of the lining material. However, if the total length of the lining material to be inserted into the existing pipe becomes long, the frictional low resistance of the lining material with the existing pipe increases, and the amount of air required for reversal increases, and with a small air compressor, reversal occurs due to insufficient capacity. It becomes difficult. Also, if you try to deal with it using a large air compressor, reversal runaway is likely to occur.

Therefore, in this embodiment, in addition to the reversing pressure due to the compressed air, the liquid 40 of the circulating liquid tank 41 is injected into the lining material 60, and the reversing pressure due to the hydraulic pressure of the liquid 40 is also used to reverse the lining material. Try to do it.

As shown in FIG. 6, the liquid level in the reversing container 1 is controlled to be higher than that of the reversing nozzle 12, and the liquid 40 is overflowed from the reversing nozzle 12 to allow the liquid 40 to flow in the lining material 60. Supply to. In the closed reversing container 1, even if the air compressor 56 is stopped, if the amount of liquid increases, the lining material can be reversed by the hydraulic pressure as shown by the virtual line. When the hydraulic pressure is reversed, the liquid 40 is consumed from the liquid quantity separating tank 41 supplied in the lining material 60. Therefore, as shown by the virtual line in FIG. 6, the tank car storing the liquid Liquid is replenished from (not shown) using a pressure pump 71 so that a liquid amount exceeding the openings 31 and 31'is always stored in the liquid tank 41.

The reversal of the lining material by air pressure and hydraulic pressure will be described below.

Pneumatic reversal is slower than pneumatic reversal, so first use pneumatic reversal. As described in relation to FIG. 3, the lining material 60 is guided to the reversing nozzle 12, one end thereof is attached to the reversing nozzle 12, and then the flow rate adjusting valve 52 is fully opened to drive the pump 50 to drive the reversing container 1. The liquid 40 is supplied into the liquid tank 41 so that the liquid level inside becomes the level 40a. In this state, the flow rate adjusting valve 58 is fully opened to drive the air compressor 56. Since the compressed air acts as a reversing pressure on the lining material 60 attached to the reversing nozzle 12, the lining material 60 is inserted into the existing pipe 67 via the manhole 66 and the bending pipe 69 as shown in FIG. Will be done.

As shown in FIG. 7, after the lining material 60 is inserted for a predetermined length, for example, several meters from the inlet of the existing pipe 67, the flow rate adjusting valve 58 is temporarily closed to interrupt the pneumatic reversal. With the flow rate adjusting valve 52 fully open, as shown in FIG. 6, the liquid 40 overflows from the reversing nozzle 12 to start the hydraulic pressure reversal. Subsequently, the flow rate adjusting valve 58 is opened to restart the air pressure reversal. Since the flow rate adjusting valve 52 controls the amount of liquid supplied for reversing the hydraulic pressure, that is, the amount of overflow of the liquid 40, the liquid level control shown in FIG. 5 is stopped.

The reversal speed of the lining material 60 due to air pressure can be controlled by adjusting the amount of air supply with the flow rate adjusting valve 58. When the amount of water supplied into the lining material 60 increases and the liquid level in the lining material rises, the flow rate adjusting valve 52 reduces the amount of water supplied, while the reversal speed increases and the liquid level in the lining material pipe decreases. If so, the flow rate adjusting valve 52 increases the amount of water supplied.

In this way, the opening degree of the flow rate adjusting valve 58 is adjusted to adjust the reversal speed due to pneumatic pressure, and the opening degree of the flow rate adjusting valve 52 is adjusted to adjust the amount of liquid supplied into the lining material 60. , As shown in FIG. 8, the liquid level 40e in the lining material 60 is empty so as to have a predetermined height h (for example, h = 0 to 2 m) beyond the ground to the lower end of the reversing nozzle 12. Perform pressure reversal and hydraulic pressure reversal. The outline of the liquid level 40e in the lining material can be roughly grasped by visual inspection, tentacles, or tapping sound of the lining material 60 on the ground.

As is clear from FIG. 8, when hydraulic pressure inversion is performed in addition to pneumatic inversion, the enclosed space required for pneumatic inversion is reduced, and even a lining material having a long overall length is effective with a small air compressor. The lining material can be inverted. Further, even when the lining material having a long overall length is inverted, the inversion is performed while supplying the liquid, so that the resistance in the pipe of the lining material can be reduced. Further, since the liquid supply amount and the reversing speed can be easily adjusted by using the flow

rate adjusting valves

52 and 58, the reversing operation is simplified.

When the lining material 60 is inverted over the entire length and inserted over the entire area of the existing pipe to be lined, the inversion operation is stopped. Since the lining material 60 is already filled with the liquid 40, the liquid 40 is guided to a work truck (not shown) equipped with a boiler and heated and circulated by the boiler to heat and cure the lining material 60. .. In this way, since the heat curing work can be started at the same time as the inversion is completed, the time is shortened and it is not necessary to attach the shower hose 63 for thermosetting as shown in FIG. 4c to the end of the lining material 60. , The effect can be obtained. In order to make the amount of liquid filled in the lining material the amount required for thermosetting, the level at which the liquid level 40e in the lining material slightly exceeds the upper end of the existing pipe 67 when it is near the end of inversion. It is preferable to adjust the amount of liquid supplied so as to be.

Pneumatic reversal and hydraulic pressure reversal can be performed using not only the reversing device shown in the first embodiment but also a conventionally known reversing device. Examples thereof are shown in FIGS. 9 to 11.

The reversing device 80 used in the second embodiment has a reversing container 81, and a conduit 82 having a plurality of guide rollers 89 is attached to the reversing container 81. A reversing nozzle 83 is attached to the tip of the conduit 82, and a liquid supply pipe 85 is attached to the reversing nozzle 83 via a joint 84. The liquid supply pipe 85 supplies the liquid supplied from the liquid tank described later into the reversing nozzle 83, and the flow rate thereof can be adjusted by using the flow rate adjusting valve 86.

The conduit 82 and the reversing nozzle 83 are configured to be separable from the reversing container 81 via the rotating shaft 87. When the conduit 82 and the reversing nozzle 83 are rotated counterclockwise about the rotation shaft 87, the reversing container 81 is opened and the lining material 60 can be wound around the shaft 88. One end of the lining material 60 wound around the shaft 88 is guided to the conduit 82 and attached to the reversing nozzle 83.

As shown in FIG. 9, when the lining material 60 is attached to the reversing nozzle 83, the reversing container 81 is in an airtight state, and is transmitted from the air compressor 92 via the air supply pipe 91 provided with the flow rate adjusting valve 90. When the compressed air is supplied into the reversing container 81, the reversing pressure acts on the lining material 60 attached to the reversing nozzle 83, and the lining material 60 is reversed from the reversing nozzle 83 and pulled out to the outside.

The reversing device 80 is attached to the loading platform of a work truck (not shown) via a support plate 93, and is moved near the manhole 66 at the work site. At the work site, as shown in FIGS. 10 and 11, the pipe 96 of the liquid tank 94 mounted on the tank car and the liquid supply pipe 85 of the reversing device 80 are connected via the pressure feed pump 95. By driving the pressure feed pump 95, the liquid 40 in the liquid tank 94 can be pumped out and injected into the reversing nozzle 83.

Similar to the first embodiment, since the pneumatic reversal is performed at first, the reversing device 80 and the liquid tank 94 are moved so that the reversing nozzle 83 faces the manhole 66 as shown in FIG. The pressure feed pump 95 is stopped, the flow rate adjusting valve 90 is fully opened, and the air compressor 92 is driven. Since the compressed air acts as a reversing pressure on the lining material 60 attached to the reversing nozzle 83, the lining material 60 is inserted into the existing pipe 67 via the manhole 66 and the bending pipe 69.

As shown in FIG. 10, after the lining material 60 is inserted for a predetermined length from the inlet of the existing pipe 67, the flow rate adjusting valve 90 is temporarily closed to interrupt the pneumatic reversal. Subsequently, the flow rate adjusting valve 86 is fully opened, the pressure feed pump 95 is driven, the liquid 40 in the liquid tank 94 is supplied into the lining material 60 via the reversing nozzle 83, and the air pressure reversal is restarted.

In the same manner as in the first embodiment, the flow rate adjusting valve 90 is adjusted to adjust the reversal speed due to pneumatic pressure, and the flow rate adjusting valve 86 is adjusted to adjust the amount of liquid supplied into the lining material 60. As shown in the above, the air pressure reversal and the hydraulic pressure reversal are performed so that the liquid level in the lining material 60 reaches a predetermined height h beyond the ground to the lower end of the reversing nozzle 83.

As is clear from FIG. 11, since the enclosed space required for pneumatic reversal is almost the same until the reversal is completed, the lining material can be effectively reversed with a small air compressor. In addition, the same effect as described in Example 1 can be obtained.

When the lining material 60 is inverted over the entire length and inserted over the entire area of the existing pipe to be lined, the inversion operation is stopped and the liquid in the lining material 60 is stopped as described in the first embodiment. 40 is heated and circulated in a boiler to heat and cure the lining material 60.

1 Inverting container 2 Opening 10 Cylindrical part 12 Inverting nozzle 15 Gas supply port 16 Hot water supply port 17 Hot water discharge port 18 Liquid supply port 30 30'Opening member 31 31' Opening 40 Liquid 41 Liquid tank 44 Liquid discharge port 45 Liquid Surface meter 50

Pressure feed pump

52, 58 Flow control valve 56 Air compressor 59 Pressure gauge 60 Lining material 66 Manhole 67 Existing pipe 69 Bending pipe 70 Liquid level gauge 71 Pressure feed pump 80 Reversing device 81 Reversing container 82 Conduit 83 Reversing nozzle 85

Liquid supply pipe

86, 90 Flow control valve

Claims

A method in which one end of a tubular lining material is attached to a reversing nozzle provided in an airtight reversing container to form a reversing pressure in the reversing container to invert the lining material into an existing pipe.
The process of supplying the compressed gas into the reversing container and forming the reversing pressure by the atmospheric pressure of the compressed gas.
It has a step of supplying a liquid into a lining material and forming a reversal pressure by the hydraulic pressure.
A method characterized in that a reversing pressure is formed by atmospheric pressure while supplying a liquid into the lining material, and the lining material is inverted by the atmospheric pressure and the hydraulic pressure.
The first aspect of claim 1, wherein the reversing container is arranged in a liquid tank, the liquid in the liquid tank is supplied into the reversing container, and the liquid supplied in the reversing container is supplied into the lining material. Method.
The method according to claim 2, wherein the liquid supplied in the reversing container overflows from the reversing nozzle and the liquid is supplied into the lining material.
The method according to claim 1, wherein the liquid tank is arranged outside the reversing container, and the liquid in the liquid tank is supplied into the lining material.
The method according to any one of claims 1 to 4, wherein the liquid is supplied into the lining material after the lining material is inverted in the existing pipe having a predetermined length by atmospheric pressure.
The method according to any one of claims 1 to 5, wherein the liquid is supplied so that the liquid level in the lining material becomes a predetermined level.
The method according to claim 6, wherein the predetermined level is above the ground and below the reversing nozzle.
The method according to any one of claims 1 to 7, wherein the lining material is made of a thermosetting resin, and the liquid supplied into the lining material is used for heat curing of the lining material.