JPH06190314A - Lining apparatus for inside of pipe - Google Patents

Abstract

PURPOSE:To prevent unevenness of the lining thickness due to the increase in flow resistance of a compressed air-paint mixture in the inside of a pipe following the progress of lining in the case of lining of the inside of the pipe to be lined by spraying the mixture through a gun. CONSTITUTION:Regarding an apparatus to line the inside of a pipe, an adjusting valve 11 is installed in the secondary side of a pressure adjusting apparatus 6 in a compressed air pipe 2 to a gun 1, so that the valve travel of the valve 11 can be controlled corresponding to the flow rate of the air flowing in the secondary side of a flow meter 5 of the pipe 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention sends compressed air and paint to a paint injection gun, and the gun mixes compressed air and paint.
The present invention relates to a pipe inner surface lining device that blows the compressed air / paint mixture into a pipe to be constructed and performs lining.

[0002] This type of pipe inner surface lining has a shorter construction period, requires less construction cost than replacing pipes, does not damage the building in the case of building pipes, and compares it with other construction methods. It has characteristics that it can be constructed regardless of the shape and thickness of the pipe and has excellent durability after construction, and is particularly suitable for lining water supply pipes in buildings.

In the pipe inner surface lining of this type, the flow resistance of the compressed air / paint mixture in the pipe increases due to the increase in the paint layer thickness due to the progress of the lining. Therefore, a measure for making the lining as uniform as possible in the pipe length direction. It is hoped that

[0004]

2. Description of the Related Art The outline of a conventional measure for the above-mentioned demand is described below with reference to FIG. 2 together with the structure of a conventional pipe inner surface lining device of the above type.

The conventional device has a schematic configuration shown in FIG. In this case, by reading the flow rate of the compressed air in the pipe 102 for feeding the compressed air to the paint injection gun 101, the lined pipe 1
It is judged that the flow resistance of the compressed air / paint mixture in 04 has increased, and the valve 106 on the secondary side of the pressure regulator 105 on the upstream side of the flow meter 103 of the pipe 102 is opened, and if necessary, the valve on the primary side. With the specification that the opening of 107 is also adjusted manually, the pressure of air to the gun 101 is adjusted,
We try to make the lining as uniform as possible in the length direction. However, this does not guarantee successful achievement of a uniform lining thickness.

[0006]

The object of the present invention is to effectively deal with the increase in the flow resistance in the pipe of the compressed air / paint mixture due to the progress of the lining in the pipe inner surface lining construction of the above-mentioned method, and to improve the lining thickness. It is to be able to achieve homogenization.

[0007]

The present invention sends compressed air and paint to a paint injection gun, mixes the compressed air and paint with the gun, and blows the compressed air / paint mixture into a pipe to be constructed to lining it. In the pipe inner surface lining device, the compressed air pipe is provided on the secondary side of a pressure regulator provided in the pipe for sending compressed air to the gun, and the flow rate of the air flowing on the secondary side of the air flow meter of the pipe is changed. It is characterized in that a control valve for automatically adjusting the opening is provided.

[0008]

The present invention will now be described with reference to FIG. 1 showing an embodiment of the present invention.

In FIG. 1, reference numeral 1 is a paint injection gun, and the gun 1
Compressed air is sent through the pipe 2, the first paint (main component) through the pipe 3, and the second paint (hardener) through the pipe 4 in the same manner as in the conventional case. The pressure of the compressed air to the gun 1 is adjusted by the regulator 6 described below.

A flow meter 5 is provided in the compressed air pipe 2. On the downstream side of the flow meter 5, the pipe 2 is divided into two from the middle. A secondary side of the pressure regulator 6 is connected to the pipe 2 upstream of the flow meter 5. The primary side of the pressure regulator 6 is connected via a dehumidifier 7 to a compressed air source such as an air compressor 8.

The upstream side of the pipes 3 and 4 is connected to the discharge port of the paint pump 9, and the paint pump 9 is supplied with the compressed air that has passed through the dehumidifier 7 through the pipe 20. The pressure is controlled in the same manner.

The compressed air and the paint sent to the gun 1 are mixed by the gun 1 in the same manner as in the conventional case, and the mixture is blown into the pipe 10 to be constructed, such as the water pipe in the building, and the Lining the inner surface.

The compressed air / paint mixture discharged from the pipe 10 is collected in a collector 13.

On the secondary side of the pressure regulator 6 of the compressed air pipe 2,
A control valve 11 is provided in the compressed air pipe 2. The flow rate fluctuation of the compressed air on the secondary side of the flow meter 5 is fed back through the detector 12 to the control valve 11, and the opening is automatically adjusted according to this flow rate.

More specifically, compressed air is pressure-fed to the gun 1 at a flow rate according to the inner diameter of the tube 10, and paint is fed to the gun 1 in an amount according to the air flow rate to advance the lining of the tube 10. When the air resistance increases and the air flow rate decreases as the coating film formation on the inner surface of the tube 10 progresses, the detector 12 detects this and the flow rate fluctuation of the air flowing through the secondary side of the flow meter 5 to the control valve 11. In response to this, an operation signal is input, and the automatic opening adjustment of the control valve 11 is performed. That is, the regulator 6 substantially automatically adjusts the air pressure to the target value. Thus, the force for propelling the paint becomes constant, and it is ensured that the coating film is always formed under appropriate conditions even if the tube 10 is relatively long or has many bends. For this reason, there is no excess paint remaining in the pipe, which causes clogging of the pipe or insufficient flow rate.

Thus, the tube 10 due to the progress of the lining
An increase in the flow resistance of the internal compressed air / paint mixture prevents the lining layer thickness from becoming non-uniform along the length of the tube 10.

To avoid this, according to the present invention, the control valve 1 is provided on the secondary side of the pressure regulator 6 of the pipe 2 for sending the compressed air to the paint injection gun 1.
1 is provided and the opening degree of the control valve 11 is adjusted according to the flow rate of the air flowing through the secondary side of the flow meter 5 of the pipe 2,
Achieve this. According to this, not only the correction of the air pressure required according to the progress of the lining can be automatically performed, but also this can be performed with good responsiveness.

[0018]

As is apparent from the above description, the present invention successfully copes with the increase in the flow resistance in the pipe of the compressed air / paint mixture accompanying the progress of the lining in the pipe inner surface lining construction of the method described at the beginning. Thus, the effect of making the lining layer thickness uniform in the pipe length direction is achieved.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention in the form of a piping diagram.

FIG. 2 shows a conventional device in a form similar to FIG.

[Explanation of symbols]

 1 Paint injection gun 2 Compressed air pipe 5 Flowmeter 6 Pressure regulator 10 Work pipe 11 Control valve

Claims (1)

[Claims] 1. A compressed air and a paint are sent to a paint injection gun, and the compressed air and the paint are mixed by the gun, and the compressed air
In a pipe inner surface lining device for blowing a coating mixture into a pipe to be constructed and lining the pipe, an air flow meter for the pipe is provided on the compressed air pipe on the secondary side of a pressure regulator provided in the pipe for sending compressed air to the gun. A pipe inner surface lining device, which is provided with a control valve whose opening is automatically adjusted according to the flow rate of air flowing through the secondary side of the pipe.