JPH0751229B2 - Pipe lining tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention provides a lining object having a diameter smaller than the inner diameter of a pipe whose inner surface is lined and which is substantially along the inner surface of the pipe over the entire circumference of a coil spring wire. The present invention relates to an inner surface lining tool for a tube which is provided at a tip portion and has a tube for supplying a lining material inserted in the coil spring wire.

[Conventional technology]

Conventionally, as shown in FIG. 4, an inner surface lining tool for a pipe has a tube (1) having a single-layer structure together with a coil spring wire (13) formed by a wire having a circular cross section.
4) was used.

[Problems to be solved by the invention] However, the coil spring-shaped wire (13) is either fed into the pipe or drawn out from the pipe,
As shown in FIG. 4, the coil diameter of the coil spring wire (13) is increased from D ₃ to D ₄ by the external force (F) caused by the rotation resistance of the lining object or the coil spring wire (13). When the coil spring wire (13) is rotated in the unwinding direction to increase the strength of the coil spring wire (13) by increasing the wire diameter or making the wire material strong, the coil spring wire (13) bends. If the coil spring wire (13) is made to bend easily, the coil spring wire (13) will be meandered by an external force (F). It will be deformed and will not rotate due to friction with the pipe, making it impossible to pass the wire, and the coil spring wire (13) will be easily broken due to the progress of deformation, and there is room for further improvement. It was.

Furthermore, if the tube (14) is made of a hard material with excellent pressure resistance such as nylon, the flexibility of the tube (14) will be poor, and the coil spring wire (13) will not bend easily and will be fed into the tube. Becomes difficult, and
Since the tube (14) receives a twisting action due to the rotation of the coil spring wire (13) and is easily kinked and closed, it becomes impossible to perform a good lining treatment, and conversely, the tube (14) is made of soft resin or rubber. When a material having excellent flexibility such as is used, the pressure resistance of the tube (14) is inferior, so that it becomes difficult to supply the lining material having high viscosity, and there is room for further improvement in these points.

An object of the present invention is to easily and surely feed a coil spring-shaped wire through the tube into the tube even if the tube is sharply bent and deforms or breaks the coil-spring-shaped wire or blocks the tube. It is possible to surely prevent it, and to enable high-pressure supply of the lining material.

[Means for solving problems]

A characteristic configuration of the present invention is that the cross-sectional shape of a wire forming a coil spring-shaped wire is such that the second moment of area against the bending external force in the diametrical direction of the coil spring-shaped wire is bent in the longitudinal direction of the coil spring-shaped wire. In addition to having a shape that is larger than the second moment of area against external force, the tube has a hardness of JIS (A) Hs 80 °
It has a two-layer structure of an inner layer made of the following materials and a blade made of a material having an elongation of 10% or more, and its function and effect are as follows.

[Action]

In other words, if any coil spring wire is used, the compression and tension spring constants will be small, the torsion spring constant will be large, and the bending stress of the wire will be small, so that sufficient flexibility and good rotational force transmission characteristics will be obtained. Combined with a coil spring wire, it can reliably pass through a pipe with many bends, and when various experiments were conducted to investigate whether deformation or breakage of the coil spring wire could be reliably prevented, a coil spring wire was formed. It was proved to be extremely effective to make the cross-sectional shape of the wire rod that has a second moment of area large against the external force in the diameter direction and small against the external force in the longitudinal direction as described above. I did.

By the way, in the above-mentioned conventional technique, a pipe having only two bent portions could be passed, but in the method of the present invention, a pipe having eight bent portions could be passed. That is, when the coil spring wire is fed in, the cross sectional shape of the coil spring wire has a second moment of area that makes the drag resistance against the twisting external force larger than the resistance against the bending external force. That is, the coil spring-like wire could be provided with an appropriate bending at the bent portion of the pipe that does not cause the above-mentioned obstacle and an appropriate expansion of the coil diameter with respect to the rotation for transmitting the propulsive force.

In addition, various attempts were made to change the diameter and elastic modulus of the wire rod, but it was not possible to combine sufficient flexibility and good torque transmission characteristics.

Furthermore, if any tube is used, the tube has sufficient flexibility, kink resistance, and pressure resistance so that even a tube with many bends can easily and reliably pass the coil spring wire and block the tube due to kink. In various experiments, we investigated whether it is possible to prevent the above-mentioned phenomenon and to reliably supply even a high-viscosity lining material.
It has been found that it is extremely effective to increase the flexibility by setting S (A) Hs to 80 ° or less to increase the elongation of the blade material to 10% or more. As described above, the conditions for combining the flexibility and elasticity of the coil spring wire with the twist resistance of the tube and the toughness against bending have been found.

〔The invention's effect〕

As a result, even if the pipe has sharp bends and many bends, there is no deformation or breakage of the coil spring wire when the coil spring wire is fed into the pipe and pulled out of the pipe while rotating, and there is no kink of the tube. It is now possible to provide an even better inner pipe lining tool that can supply lining material at high pressure.

〔Example〕

 Next, examples will be shown.

As shown in FIG. 1 (a), in the branch pipe (2) connected to the underground city gas supply main pipe (1), an opening is formed in the above-ground portion (2a). That is, for example, an opening is formed by removing the customer gas meter and the meter cock in the meter standpipe as the branch pipe (2).

As shown in FIG. 2, three lining objects (6a), (6) are attached to the tip of the coil spring wire (3).
b) and (6c) are attached, and a lining material supply tube (7) for injecting a liquid lining material into the coil spring wire (3) is inserted into the inner surface lining tool of the pipe. Is wound around a storage drum (4) which can be sent out and wound up while rotating, and a lining material injection device (11) is connected to the tube (7) to form a lining device (A).

Then, as shown in FIG. 1 (b), the water sealer (10) is connected to the aboveground part (2a) of the branch pipe (2), and the lining objects (6a), (6b) of the lining device (A) are connected. ), (6c)
Put the coil spring wire (3) and the tube (7) in the water sealer (10), put them in the branch pipe (2), push the coil spring wire (3) while rotating it, and the lining object. While rotating (6a), (6b) and (6c), feed them into the vicinity of the main pipe side end of the branch pipe (2).

At this time, as shown in FIG. 3, the lining object (6
The coil diameter of the coil spring wire (3) may be increased from D ₁ to D ₂ by the external force (F) caused by a), (6b), (6c) and the rotation resistance of the coil spring wire (3). The coil spring wire (3) is rotated in the rewinding direction to
At the hooking point between the branch pipe (2) and the branch pipe (2), the coil spring-like wire (3) is applied with a propulsive force due to its rotation in the feeding direction.

As the coil spring wire (3), the wire rod forming the wire has a rectangular cross-sectional shape, and the relationship between the longitudinal dimension l ₁ and the diametric dimension l ₂ of the coil spring wire (3) is l ₁ <l ₂ <3 l ₁ is used to allow the coil spring wire (3) to smoothly and surely pass through the curved portion of the branch pipe (2), and the coil spring wire (3) Eliminates deformation and destruction of.

Furthermore, as the tube (7), the hardness is JIS (A) Hs80
Inner layer (7a) consisting of a material below °, eg soft PVC
And a material having an elongation of 10% or more, for example, a blade (7b) made of staple vinylon or the like, having a two-layer structure, and the flexibility of the coil spring wire (3) makes the tube (7) It prevents the kink of the tube (7) due to the rotation of the coil spring wire (3) and enables the high-pressure supply of the lining material by the tube (7). Also tubes (7)
Is (inner diameter) / (wall thickness) = 1.5 to 7.

After that, as shown in FIG. 1 (C), the coil spring wire (3) and the lining objects (6a), (6b),
With (6c) stopped, a suitable amount of the liquid lining material (12) from the tube (7) is injected into the branch pipe (2) by the injection device (11).

Then, as shown in FIG. 1 (d), the coil spring wire (3) and the lining objects (6a), (6b),
The lining object (6a), (6) is pulled while rotating (6c) in the direction opposite to the direction in which it is fed into the branch pipe (2).
b), (6c) is pulled out, and the lining material (12) is continuously injected by the tube (7), and the lining material (12) is washed away by the lining objects (6a), (6b), (6c). Apply to the inner surface of the branch pipe (2).

At this time, a propulsive force associated with the rotation of the coil spring wire (3) is applied to the coil spring wire (3) in the pulling direction at the catching point between the coil spring wire (3) and the branch pipe (2).

Then, an inner surface lining process is performed over the entire length of the branch pipe (2).

After that, the water sealer (10) is removed from the branch pipe (2), the branch pipe (2) is restored and connected, and the city gas supply by the branch pipe (2) is restarted.

[Another embodiment]

 Next, another embodiment will be described.

To apply an external force to the coil spring wire (3) for rotation, for example, (a) the housing drum (4) of the coil spring wire (3) is rotated forward and backward, and (b) a coil spring is used by a chuck or the like. Wire (3)
It is carried out by various means such as grasping and rotating it forward or backward, or (c) rotating the guide for guiding the coil spring-shaped wire (3) withdrawn from the storage drum (4) forward or backward.

In order to apply an external force to the coil spring wire (3) for feeding or withdrawing, for example, (a) the female screw externally fitted to the coil spring wire (3) is rotated and its rotation speed is adjusted, (B) Rotating the roller and the caterpillar pressed against the coil spring wire (3) in the forward and reverse directions, stopping them, and other various means.

The wire rod forming the coil spring wire (3) generally has a rectangular cross section, a trapezoid, etc., but the second moment of area of the coil spring wire (3) against the bending external force in the diametrical direction is The spring wire (3) may have a shape larger than the second moment of area with respect to the external bending force in the longitudinal direction. However, in the case of a trapezoid, the bottom of dimension l ₃ should be inside and its dimension l ₃ and height l ₄
It is desirable that the relation of l ₃ <l ₄ <3l ₃ be satisfied.

The coil spring wire (3) can be appropriately selected in terms of material, such as the same quality as hard steel wire or piano wire, and the wire diameter, inner diameter, outer diameter and pitch are appropriate depending on the size and bending of the pipe. Can be selected.

The lining object (6) can be appropriately changed in material, shape, structure, number, size and the like.

The lining material (12) may be a two-liquid mixed type, a room temperature curable type, a moisture curable type, or any of various other properties.

The main pipe (1) and the branch pipe (2) may be for natural gas, water supply, etc., and the present invention can be applied to various pipes (2). The pipe (2) may be hidden in the structure or may be exposed.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 3 show an embodiment of the present invention, FIGS. 1 (a) to 1 (d) are conceptual diagrams of a construction procedure, and FIG. 2 is a schematic diagram of a lining device. FIG. 3 is an explanatory view of a coil spring wire and a tube. FIG. 4 is an explanatory view of a conventional coil spring wire and tube. (2) ... Tube, (3) ... Coil spring wire, (6) ... Lining object, (7) ... Tube, (7a) ... Inner layer, (7b) ... Blade, (12) ......
Lining material.

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Fumio Tsukimoto 5-1, Hirano-cho, Higashi-ku, Osaka, Osaka Prefecture Osaka Osaka Gas Co., Ltd. Inside the rubber factory (72) Inventor Tetsuo Rokura 4-5 Minamihorie, Nishi-ku, Osaka City, Osaka Prefecture Tokawa Rubber Co., Ltd.

Claims (1)

[Claims] 1. A lining object (6) having a diameter smaller than the inner diameter of a pipe (2) to be lined on the inner surface and extending substantially along the inner surface of the pipe (2) is provided at the tip of a coil spring wire (3). And a tube (7) for supplying a lining material, which is provided in the section
An inner surface lining tool for a pipe inserted in a pipe, wherein the cross-sectional shape of a wire forming the coil spring wire (3) is the coil spring wire (3).
The second moment of area for the diametrical bending external force is larger than the second moment of cross section for the external bending force of the coil spring wire (3) in the longitudinal direction, and the tube (7) is hardened. Saga JI
S (A) Hs A pipe inner surface lining tool having a two-layer structure of an inner layer (7a) made of a material having a temperature of 80 ° or less and a blade (7b) made of a material having an elongation of 10% or more.