JPH0441973Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

This invention relates to a paint injection device for lining the inner walls of existing pipes when the pipes are being rehabilitated.

[Conventional technology]

Rehabilitation pipes, such as those installed inside buildings and condominiums, can be used to remove rust from the inner walls after many years.
After polishing the inner wall, it is necessary to apply a lining paint to the inner wall of the rehabilitated pipe and rehabilitate it. In such pipe rehabilitation work, the process of lining with paint involves thoroughly mixing the two components, the main paint agent and the curing agent, using a paint mixer, and then spraying the paint onto the inner wall surface of the pipe using compressed air. There are known techniques to do this.

[Problem that the invention attempts to solve]

However, when spraying paint in the form of a spray, the clay content of the paint must be lowered.
If the clay content of the fuel is low, the thickness of the coating film becomes thin, and there is a problem in that the expected coating thickness cannot be obtained. Furthermore, in order to obtain the intended coating thickness, spraying must be carried out two or three times, resulting in poor workability.

[Means to solve the problem]

As a specific means to solve the problems of the conventional example, this invention connects a paint discharge pipe provided at the bottom of the lining paint tank to a compressed air pipe that can be connected to one end of the rehabilitation pipe, and connects the paint discharge pipe provided at the bottom of the lining paint tank to the compressed air pipe that can be connected to one end of the rehabilitation pipe. A branch pipe is connected to the upper part of the lining paint tank, and a pressure regulating valve is provided in the middle of the branch pipe so that the amount of paint supplied can be adjusted by adjusting the compressed air between the compressed air pipe and the branch pipe. An inner wall of a rehabilitated pipe, characterized in that the opening of the paint discharge pipe is bent along the wall surface so that the supplied paint is expanded in an annular flow by the compressed air from the compressed air pipe. It provides a lining paint injection device, in which the supplied paint does not become atomized, but flows in an annular manner along the tube wall, making it possible to build up the clay and achieve the intended film in one coat. A thick coating film can be applied as a lining.

【Example】

Next, the pipe inner wall lining paint injection device according to this invention will be explained in detail based on an illustrated embodiment. In FIG. 1, 1 is a rehabilitated pipe to be lined, and one end side 1 of the rehabilitated pipe Compressed air pipe for pipe rehabilitation that can be connected to 2 ₁
A compressor 7 is connected to the other end of the compressed air pipe ₂₁ , and the compressor 7 is configured to send compressed air. A discharge pipe 4 of a lining paint tank 3 is connected to the compressed air pipe 2 ₁ , and a branch pipe 2 ₂ branched from the compressed air pipe 2 ₁ is connected to the lining paint tank ₃ . Pressure regulating valve 5 in the middle of
It is configured to be able to supply compressed air arbitrarily adjusted by the pressure regulating valve 5. As shown in FIG. 2, the lining paint tank 3 has a free piston 6 floating above the paint in the tank for equalizing the pressure of the paint, and above the free piston 6 is a compressed air chamber 9 which is connected to the branch. A cap 8 is placed on the upper end of the lining paint tank 3 through which the pipe 2 ₂ communicates, and the discharge pipe 4 provided at the bottom of the tank 3 communicates with the compressed air pipe 2 ₁ . Discharge pipe 10
is formed by slightly bending its open end so that the discharged paint follows the inner wall of the tube. In addition, compressed air is discharged through a paint collector 11 at the other end of the rehabilitation pipe 1.

[Effect]

In the rehabilitation pipe inner wall lining paint injection device of the present invention having the above configuration, a compressed air pipe 21 is connected to one end side 1' of the rehabilitation pipe 1, and the discharge pipe 4 of the lining paint tank ₃ and the paint are connected to the compressed air pipe 21. Discharge pipe 1
0 is open, so when compressed air is sent from the compressor 7 to the compressed air pipe 2 ₁ , a part of the compressed air passes through the branch pipe 2 ₂ to the lining paint tank 3.
The compressed air enters the chamber 9, applies pressure evenly to the paint through the free piston 6, and discharges the required amount of paint from the paint discharge pipe 10, so that the open end of the paint discharge pipe 10 is as shown in FIG. As shown, the compressed air pipe ₂₁ is bent and opened along the wall of the pipe, so the discharged paint flows down the pipe wall one after another, and the paint and compressed air flow along the pipe wall. The paint flows as a two-phase annular flow, and the paint is eventually stretched out in an annular shape by the annular compressed air, resulting in approximately uniform lining. The amount of paint supplied can be freely set by adjusting the pressure of compressed air to the chamber 9 with the pressure regulating valve 5 provided in the branch pipe _22. In particular, by balancing the supply of compressed air and paint, the amount of paint supplied can be set as desired. A thick coating film can be formed. Also lining paint tank 3
For this purpose, paint can be replenished as appropriate from a separately provided paint mixer.

[Effect of the idea]

As explained above, the rehabilitation pipe inner wall lining paint injection device according to the present invention connects the paint discharge pipe provided at the bottom of the lining paint tank to the compressed air pipe that can be connected to one end of the rehabilitation pipe, and from the compressed air pipe. The branch pipe is connected to the upper part of the lining paint tank, and a pressure regulating valve is provided in the middle of the branch pipe so that the amount of paint supplied can be adjusted by adjusting the compressed air between the compressed air pipe and the branch pipe. west,
By configuring the opening of the paint discharge pipe to be bent along the wall surface so that the paint to be supplied is expanded in an annular flow by the compressed air from the compressed air pipe, the viscosity can be compared. The excellent effect of being able to uniformly form a coating film with a predetermined thickness in one coat, since the supply amount of highly accurate paint can be adjusted in line with the compressed air by adjusting the pressure regulating valve. play.

[Brief explanation of drawings]

FIG. 1 is a schematic front view showing an embodiment of the rehabilitation pipe inner wall lining paint injection device according to this invention, and FIG. 2 is a longitudinal sectional view of a lining paint tank communicating with a compressed air pipe. 1...Rehabilitation pipe, 1'...One end side, 2 ₁ ...Compressed air pipe, 2 ₂ ...Branch pipe, 3...Lining paint tank, 4...Lining paint tank discharge pipe, 5
...Pressure regulating valve, 10...Paint discharge pipe.

Claims (1)

[Scope of utility model registration request] A paint discharge pipe provided at the bottom of the lining paint tank is connected to a compressed air pipe that can be connected to one end of the rehabilitation pipe, and a branch pipe branched from the compressed air pipe is connected to the top of the lining paint tank. A pressure regulating valve is provided in the middle of the compressed air pipe to adjust the amount of paint supplied by adjusting the compressed air between the compressed air pipe and the branch pipe. A rehabilitation pipe inner wall lining paint injection device, characterized in that the opening of the paint discharge pipe is bent along a wall surface so that the paint is elongated in an annular flow.