JPS5850779B2 - Pipe inner lining method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for lining the inner surface of a pipe, and is a method useful for lining the inner surface of an existing pipeline.

If the paint film on the inner surface of an existing pipe deteriorates, it is necessary to repaint the inner surface.

By the way, conventionally, as a method for lining the inner surface of a pipe, a wire 2' with a pig 1' attached to one end is passed through the pipe 3' as shown in FIG. 1A, and then the pipe 3 is lined as shown in FIG. 1B. Inject a predetermined amount of paint 4' into one end of ',
Thereafter, as shown in FIG. 1C, there is a known method in which the wire 2' is pulled and the paint 4' is pushed forward with a pig 1'.

However, in existing water piping and gas piping,
If an existing pipe that has a dog-like bend with a difference in elevation is lined with the above lining method, the first
As shown in the figure, when the pig 1' is passed from the high point A' to the low point B' of the target piping section, the paint 4' is removed from the low point B'.
This causes an insufficient amount of paint to line the inner surface of the vertical pipe section, making it difficult to reliably line the entire inner circumference of the vertical pipe section.

The pipe inner lining method according to the present invention is a method that can reliably line the entire inner circumferential surface of the curved part even if there is a dog-shaped curved part with a difference in height in the middle of the pipe, and the pipe that should be inner-lined A paint inlet is provided at one end of the
By pulling a pipe drawing wire with a plurality of pigs attached to one end at predetermined intervals, the pigs are moved into the pipe from one end of the pipe to the other, and at the beginning of this movement, the above-mentioned paint This method is characterized by supplying paint between the pigs from an injection port, and then applying the paint between the pigs to the inner surface of the pipe by moving the pigs.

The present invention will be explained below with reference to the drawings.

In FIG. 2A, reference numeral 1 indicates a pipe line to be lined on the inner surface, and a paint inlet 11 is provided at the upper part of the outer surface at one end.

This paint injection port 11 is drilled. Instead of the hole, it is also possible to connect an auxiliary pipe 12 having a paint inlet 11, as shown in FIG.

In FIG. 2B, reference numeral 2 denotes a pulling wire, which has been drawn through the conduit 1 in advance, and at one end of the wire 2, several drops of pigs 31, 32, . . . are placed at regular intervals.・ is installed.

The pig can be a sphere or a short cylinder, and its outer diameter is about 1 to 3 mm smaller than the inner diameter of the pipe, and the material is, for example, lead,
Silicone resin, silicone rubber, etc.

In the present invention, examples of the wire include commonly used wires, ropes, wires, and the like.

To carry out the present invention, the wire 2 is pulled to move the pigs 31, 32, . As shown in the figure, pigs 31, 32, 32, 33. ...The paint 4 is supplied in between.

Then, just before the last pig 33 passes through the paint injection port 11, the injection of paint is stopped.

In this series of paint supply, even if some paint is supplied in front of the first pig 31 and behind the last pig 33,
No problem.

After the paint is supplied between the pigs as described above, the paint between the pigs is applied to the inner surface of the pipe by the subsequent pulling of the wire 2, as shown in the second diagram.

In this case, as shown in FIG. 2E, even if there is a bend in the middle of the pipe with a difference in height,
, 33, the paint 4 between the two pigs 31, 32, 32, 3
Because it is blocked by the front pig 31 and 32 of 3,
The paint 4 does not flow down to the low point B, and it is possible to completely line the inside of even the curved pipe section with the difference in height.

In the present invention, the number of pigs connected to the traction wire is
Preferably there are 3 to 200 pigs, and the interval between the pigs is preferably 0.5 to 10 m.

Incidentally, when the paint inlet at one end of the pipe is provided by drilling, it goes without saying that the drilling should be sealed after the inner surface is lined.

The paint used in the example is a two-component type resin liquid that hardens at room temperature, and the weight ratio of liquids A and B is 2 parts A and 1 part B, and the weight ratio of parts A and B is 2 part A part: part B part. B liquid 1, touch dry time 3
It's time.

A (2""1゛'1 fat ゛°cap powder silica
5 parts polyamide amine 100 parts B liquid fine powder silica 5 parts A vertical bend with a height difference of 2 m is made in the middle of a steel pipe with an inner diameter of 2811 Lrn and a length of 10 m, and a diameter of 26 cm is made at one end of the wire.
Attach four of our lead balls (pigs) at 1 m intervals, move the lead balls into the steel pipe by pulling the wire, and at the beginning of the movement, a total of 900 gr is poured between all the lead balls from the paint injection port at one end of the steel pipe. supplied paint.

After lining the inner surface, the vertically bent portion of the steel pipe was cut and the condition of the inner surface coating was observed, and it was found that the entire inner circumferential surface was completely coated with paint.

As described above, according to the present invention, even if an existing pipe has a curved pipe portion with a height difference, it is possible to satisfactorily line the inner surface of the pipe.

[Brief explanation of the drawing]

Figure 1A, Figure 1B, Figure 1C, and Figure 1 are explanatory diagrams showing the work procedure of the conventional inner lining method for pipes, Figure 2A, Figure 2B, Figure 2C1, Figure 2. Diagram and Figure 2 E
3 is an explanatory diagram showing the working procedure of the method for lining the inner surface of a pipe according to the present invention, and FIG. 3 is an explanatory diagram showing an example of the paint injection port at one end of the pipe according to the present invention. In the figure, 1. is a pipe, 11 is a paint inlet, 2 is a wire 31, 32...pig, and 4 is a paint.

Claims (1)

[Claims] 1. A paint injection port is provided at one end of the pipe to be internally lined, and a plurality of pigs are attached to the pipe at predetermined intervals at one end, and a pipe pulling wire is dragged through the pipe to insert the pigs into the pipe. A pipe characterized in that the pipe is moved from one end to the other end, paint is supplied between the pigs from the paint injection port at the beginning of this movement, and the paint between the pigs is applied to the inner surface of the pipe by subsequent movement of the pigs. inner lining method.