JPS6411352B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for lining the inner surface of a transport conduit for various fluids such as city gas, petroleum, and water.

More specifically, a lining agent and a lining object are placed in a conduit, and pressurized fluid is supplied into the conduit behind the lining object to force feed the lining object, and the lining agent is transferred to the lining. The present invention relates to an improvement in a method for lining the inner surface of a conduit in which the lining is applied to the inner surface of the conduit by sweeping it through the conduit with an object.

[Conventional technology]

Conventionally, as shown in FIG.
In order to avoid the impossibility of passage at the bend in the conduit due to entry into the conduit, for example, when connecting a plurality of members to form an object to be pumped inside the conduit, it is necessary to use a method for cleaning rather than lining. Yes, Kimiaki Sane
This was done as shown in Publication No. 31-11602 and Publication No. 33-14845. In other words, the front and rear members are asymmetrical and have a shape that can efficiently receive fluid back pressure from the rear, in other words, the front members are designed to focus only on forward function, and the front members focus only on propulsion, while the rear members are used for work. With an emphasis on function, the parts were made to have very different shapes from each other.

[Problem that the invention seeks to solve]

However, when the front member enters the plug side space 04 shown in Figure 1B, the rear member replaces the front member, and the front and rear members turn in opposite directions, causing the T-shaped bent portion of the conduit to become an object. As the object attempts to pass through, the object's propulsion force due to fluid back pressure becomes extremely small, and the object's movement resistance increases considerably, resulting in a large risk of the object not being able to pass through the T-shaped bend. It was hot.

Furthermore, when applying a liquid lining agent to the inner surface of a conduit using a member, if the front and rear members are swapped, the shape of the member becomes unsuitable for applying the lining agent, making it difficult to perform the lining work properly. arise.

An object of the present invention is to enable smooth and reliable passage of a lining object even through a T-shaped bent portion of a conduit as shown in FIG. The point is to make it.

[Means for solving problems]

The characteristic means of the present invention is to use two lining objects of approximately the same size as each other as lining objects that are applied to the inner surface of the conduit while pushing away the lining agent as it is pumped inside the conduit.
spherical members connected by a flexible strip, and at the T-shaped bent portion of the conduit, the two spherical members are
The first of the two spherical members is put into the sealed conduit section, the second one is put into the part to be lined first, and then the two spherical members are forced-fed with the front-to-back positional relationship reversed. , its functions and effects are as follows.

[Effect]

In other words, as shown in FIG. 3B, as the lining object moves within the conduit 1 due to fluid back pressure,
When the front spherical member 2 enters the sealed conduit portion such as the plug side space 4, the rear spherical member 2' is prevented from entering the sealed conduit portion by the blocking action of the front spherical member 2, and the T-shaped bend of the conduit is prevented. pass through the part,
In addition, the spherical member 2 is pulled out from the sealed conduit portion by another spherical member 2', and then the lining object A is fed under pressure with the front and rear positional relationship of both spherical members 2, 2' reversed. .

Since both members 2 and 2' are spherical with approximately the same dimensions, even if their positional relationship is reversed, the propulsion function and lining work function due to fluid back pressure can be maintained well without changing. The lining object can be passed through the T-shaped bend of the conduit smoothly and reliably, and the conduit 1
The inner lining work can be continued as desired.

〔Effect of the invention〕

As a result, even if the conduit has many sharp bends or T-shaped bends, lining work due to the fluid back pressure of the lining object can be carried out easily and quickly while reliably preventing clogging of the lining object. A method for lining the inner surface of a conduit which can be carried out reliably as desired and is extremely effective for conduit repair has been obtained.

〔Example〕

Next, an embodiment will be shown with reference to FIGS. 2 to 4.

As shown in Fig. 2, two spherical members 2, 2' of approximately the same size are attached to a flexible strip such as a string, wire, or spring inside a conduit 1 that is open at both ends of the work area. Two lining objects A connected by 3 are placed, and a liquid lining agent A is placed between both lining objects A.

A blower 5, a pressure regulator 6, and an on-off valve 7 are connected to the conduit 1, and pressurized air is supplied into the conduit 1 behind the lining object A on the rear side, and both lining objects A are fed under pressure. The lining agent a is swept away inside the conduit 1 by the lining object A on the rear side and applied to the inner surface of the conduit, thereby lining the inner surface of the conduit.

Then, at the T-shaped bent part of the conduit 1 that has been plugged, the leading one 2 of the two spherical members 2, 2' that have been moving in tandem, is plugged, as shown in Fig. 3A. The following spherical member 2' is brought into contact with the preceding spherical member 2, and as shown in FIG. The attached spherical member 2 is pulled out, and the two spherical members 2 and 2' are moved in an inverted state as shown by the imaginary lines. At this time, both members 2, 2' are made into spherical shapes of approximately the same size, so that even if the positions change back and forth as described above, the subsequent movement performance and lining performance of the lining object A are maintained satisfactorily.

In addition, when the lining agent a has a low viscosity and is easy to flow, the lining material A is used as in the above example.
Lining agent a is put between the two, but if lining agent a has a high viscosity and is difficult to flow, one lining object A is put into the conduit 1, and lining agent a is placed in front of the lining object A.
You may also include

Furthermore, as shown in FIG. 4, in the T-shaped bend portion where the plugging space 4 is long, when the leading one of both spherical members 2, 2' enters into the space 4, the preceding spherical member 2 increases the air pressure in the space 4 until it becomes almost equal to the air pressure behind the lining object A,
When the front and rear air pressures are balanced, the leading spherical member 2
stops without penetrating any further into the space 4, and the succeeding spherical member 2' intersects with the preceding spherical member 2.
It passes through a T-shaped bend. And T
The spherical member 2, which has passed through the bent portion and entered the space portion 4 by the traction action of the spherical member 2', is pulled out and passes through the T-shaped bent portion.

At this time, when the spherical member 2 enters the space 4 and is pulled out to the entrance of the space 4, the spherical member 2
The lining agent pushed by the lining object at the rear flows into the space 4 from the gap between the conduit 1 and the spherical member 2, and the spherical member 2 is smoothly pulled out.

Therefore, in substantially the same manner as described above, both spherical members 2,
2' passes through with the context reversed. Furthermore, striation 3
It is desirable to make the length slightly larger than the distance L of the preceding spherical member 2 entering the space portion 4.

[Brief explanation of drawings]

FIGS. 1A and 1B are explanatory diagrams of a clogged state at a curved portion in a conventional example. Figures 2 to 4 show examples of the present invention; Figure 2 is a conceptual diagram of the initial stage of work;
Figures A, B and 4 are explanatory diagrams of the state of passage through a T-shaped bend. DESCRIPTION OF SYMBOLS 1... Conduit, 2, 2'... Spherical member, 3... Flexible strip, A... Lining object, a... Lining agent.

Claims (1)

[Claims] 1 Put the lining agent a and the lining object A into the conduit 1, and supply pressurized fluid into the conduit 1 behind the lining object A to force-feed the lining object A, and at the same time A method for lining the inner surface of a conduit, in which the lining object A is applied to the inner surface of the conduit 1 by forcing the lining object A into the conduit 1, and the lining object A is two spherical members 2 having substantially the same size. . , a conduit inner surface lining method in which a subsequent one is first put into the part to be lined, and then the two spherical members 2, 2' are force-fed with the front-back position relationship reversed.