JPS62289278A - Method for coating inside surface of piping - Google Patents

Abstract

PURPOSE:To obtain substantial strength in the bent part of a piping by specifying the flow rate of the gas flowing in the piping and the mixing ratios of the reinforcing fibers in the gas at the time of sticking an adhesive agent to the inside surface of the bent part and sticking the reinforcing fibers conveyed by the above-mentioned gas to the adhesive agent. CONSTITUTION:The adhesive agent 10 or lining material is stuck to the inside surface of the bent part 1a of the piping 1 and thereafter the reinforcing fibers 11 conveyed by the gas flowing in the piping 1 are stuck to the adhesive agent or lining material. The flow speed of the gas is maintained at 1-120m/sec and the mixing ratios of the reinforcing fibers to the gas is maintained at 0.01-2wt% in this stage. As a result, the substantial amt. of the reinforcing fibers can be stuck only to the bent part of the piping and substantial strength in the bent part of the piping is obtd. with efficient working.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Industrial Application Field] The present invention provides adhesives or lining materials that are applied to the inner surface of a bent portion of a pipe and then flowed within the pipe. The present invention relates to a method for coating the inner surface of piping, in which reinforcing fibers conveyed by gas are attached to the adhesive or lining material.

[Conventional technology]

Conventionally, an adhesive or lining material has been applied over the entire range of pipes to be treated, and reinforcing fibers have been applied over the entire adhesive or lining material.

[Problem that the invention seeks to solve]

For example, (a) the straight part of the pipe has little or no damage due to fluid transport, but the bent part is easily damaged due to severe collision with the fluid; (U) the inner surface of the pipe is damaged by airflow transport of the lining material. Because of the lining, it is possible to form a lining layer of sufficient thickness on the straight part of the pipe, but in cases where the lining layer becomes thinner due to the lining material being washed away by air currents, reinforcement is applied only to the bent part of the pipe. It is desirable to attach fibers for use. However, conventional methods cannot meet such demands; unnecessary fibers adhere to straight pipes, which increases the pressure of the pipes, and requires longer pipes to be constructed due to the increased amount of fibers required. There were problems such as the need for labor and time, and there was room for further improvement.

An object of the present invention is to enable a sufficient amount of reinforcing fibers to be attached only to the bent portions of piping, and to supply the reinforcing fibers so that sufficient strength can be obtained through efficient work.

[Failure to solve the problem]

The characteristic means of the present invention is to maintain the flow rate of the gas that conveys the reinforcing fibers at 1 to 120 m/sec, and to maintain the mixing ratio of the reinforcing fibers to the gas at 0.01 to 2 wt%, Its effects are as follows.

[For production]

In other words, when the gas flow velocity exceeds 120 m/sec,
Adhesives and lining materials adhering to bent portions of piping are moved downstream by wind pressure, resulting in an insufficient amount of reinforcing fibers adhering to bent portions. Furthermore, if the gas flow rate is less than 1 m/sec, the reinforcing fibers will not be able to penetrate the adhesive or lining material adhered to the curved portion of the pipe sufficiently, making it impossible to obtain effective fiber reinforcement. In short, the gas flow rate is 1
When the speed is set to 120 m/sec, the lining layer can be sufficiently and reliably reinforced with fibers at the bends of the pipe.

If the mixing ratio of reinforcing fibers exceeds 2 wt% (fiber weight/gas weight 4), a large amount of reinforcing fibers will adhere to the straight pipe portion of the pipe. Furthermore, if the mixing ratio is 0.01 wt% of ungrooved reinforcing fibers, the reinforcing fibers must be supplied for a considerable period of time in order to attach a sufficient amount of reinforcing fibers to the curved portion of the piping. There are problems in terms of efficiency and shortening the time required for fluid transport interruption in piping. In short, when the mixing ratio of reinforcing fibers is set to 0.01 to 2 wt%, a sufficient amount of reinforcing fibers can be attached only to the curved portion, and the work can be carried out efficiently.

〔Effect of the invention〕

As a result, it is now possible to attach reinforcing fibers only to the bends in sufficient quantity and strength, and with good work efficiency.
An extremely advantageous method has been obtained when lining reinforcement with reinforcing fibers only at bends is required.

〔Example〕

Next, examples will be shown.

As shown in Figure 1, pipe (1) with a bend (1a)
Cut and open at an appropriate position commensurate with the repair area,
A lid (6) connected to an adhesive supply device (2), a reinforcing fiber supply device (3), a liquid lining material supply device (4), and a blower (5) is placed on one end side of the pipe (1), and Collection device (7a), '(7b), (7c) and exhaust fan (8)
The lid (9) connected to the pipe (1) is connected to the other end of the pipe (1).

First, the pipe (1) is removed by the action of the blower (5) and exhaust fan (8)
1 to 120 m/sec, preferably 1 to 60 m/s
EC is used to flow gas, only the valve (ν+)+ (V4) is opened, and the adhesive from the supply device (2) is atomized and transported by airflow, mainly at the bends, as shown in Figure 2 (a). (
Adhesive (10) is applied to la), the excess adhesive is collected by collect)3 (7a), and only the gas is released.

Next, only the valves (V2) and (Vs) are opened, and an appropriate amount of fine reinforcing fibers are supplied from the supply device (3),
The mixing ratio of reinforcing fiber to gas is 0.01 to 2 wt%.
, preferably maintained at 0.08 to 0.2 wt%, the reinforcing fibers are conveyed in the pipe (1) with gas at a rate of 1 to 120 m/sec, preferably 1 to 60 m/sec, as shown in Fig. T
As shown in 1), a sufficient amount of reinforcing fibers (11) are attached to the adhesive (10) only at the bent part (1a), and the excess reinforcing fibers are collected by the collector (7b) and only the gas is removed. emit.

Next, only the valve (V3) and (white) are opened, and the liquid lining material from the supply device (4) is made into an annular flow or atomized and transported by air flow, as shown in FIG. 2 (c). The lining (12) covering the entire pipe (1) is connected to the bent part (1).
It is formed in a state reinforced with fibers (11) in step a), excess liquid lining material is collected in a collector (7c), and only gas is released.

Finally, stop the blower (5) and exhaust fan (8), remove the lids (6) and (9) from the pipe (1), and if necessary, use an appropriate means such as supplying hot air to the pipe (1). ) is solidified, and the liquid lining material (12) applied to the pipe (1
) to restore the connection.

Examples according to c] Next, another embodiment will be described.

The target pipes (1) are mainly existing pipes for city gas, natural gas, water supply, and other types, but any type of newly installed pipes or anything else may be used.

The adhesive and lining material to be used may be thermosetting type, room temperature curing type, or various other known substances (also, when using adhesive and lining material, they may be of the same or different quality). It's okay.

The reinforcing fibers to be used can be appropriately selected in terms of material, size, shape, etc., and for example, glass fibers, carbon fibers, vinylon, natural fibers, etc. are used.

Air or other suitable gases can be used to transport the reinforcing fibers, and suitable blowing equipment can be selected.

The construction form for coating the inner surface of the pipe (1) can be selected as appropriate, for example, (a) attaching a lining material to the entire inner surface of the pipe,
It is possible to attach reinforcing fibers to the lining material only at the bent part (1a), or to attach an adhesive only to the (Il+) bent part (la>), and to attach reinforcing fibers to the adhesive. Yes, we also use adhesives and lining materials for piping (1
) can be appropriately selected such as a spray method.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a conceptual diagram of a construction form, and FIGS. 2(a) to 2(c) are explanatory diagrams of an inner surface coating state. (1)...Piping, (la)...Bent part.

Claims (1)

[Claims] [1] After adhering an adhesive or lining material to the inner surface of the bent portion (1a) of the pipe (1), the pipe (1)
A method for coating the inner surface of a pipe in which reinforcing fibers carried by a gas flowing in the pipe are adhered to the adhesive or lining material, wherein the flow rate of the gas is maintained at 1 to 120 m/sec, and the reinforcement against the gas is The mixing ratio of fibers for use is 0.
A method for coating the inner surface of piping to maintain a concentration of 0.01 to 2 wt%. [2] The method according to claim [1], wherein the gas flow rate is maintained at 1 to 60 m/sec and the mixing ratio is maintained at 0.08 to 0.12 wt%.