JP3061545B2 - Lining method of pipe inner surface - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to pipes such as existing water supply pipes installed in buildings,
The present invention relates to a method for lining an inner surface of a pipe by blowing a predetermined coating material in an annular flow after removing and removing dirt such as scale.

[0002]

2. Description of the Related Art Although not a technique of lining the inner surface of a pipe with a paint, a technique of flowing a seal material into a pipe by using an annular flow is disclosed in, for example, Japanese Patent Publication No. 58-11.
No. 263 is known as a conventional example.

[0003] This conventional technique is applied to existing conduits.
The purpose of the present invention is to make it possible to easily and surely attach a sealant to a place where a seal is required to prevent leakage or repair, and to minimize the adhesion of the sealant to other parts. This is a sealing method in which a gas-liquid mixed-phase flow of a sealing material and a carrier gas is caused to flow in an existing conduit at a high speed enough to become an annular flow, and a concave portion of the inner wall of the conduit is filled with a sealing material. When flowing in a conduit as a flow, the sealing material adheres very thinly or hardly to a smooth surface, and is applied to a leaking portion such as a crack, a hole or a joint portion, or a concave portion which is likely to leak. In this case, they are surely and sufficiently adhered and accumulated.

[0004]

According to the conventional sealing method, a mixer is connected to an end of an existing conduit to be sealed, and a tank for storing a sealing material for the mixer and an air supply. By connecting a blower and simultaneously supplying a sealant and air serving as a carrier gas to the mixer to form a gas-liquid multi-phase flow that flows sequentially. It has the problem of being bad.

In addition, because of the gas-liquid multi-phase flow, the adhesion of the sealing material to the smooth surface is unstable and not only does not occur, but also the gas-liquid multi-phase flow must flow to the end of the existing conduit. Since this is not the case, many times the required amount of sealing material is injected into the pipe, which causes a problem that material is wasted.

Therefore, in the above-mentioned conventional example, it is only necessary to fill the cracks, holes and recesses to the extent that it is tired, and it cannot be used as a technique for substantially uniformly lining the inside, but also forms a gas-liquid mixed phase flow. Therefore, even if it is used for the lining of existing pipes, the workability of coating and the uniform coating There is a problem that must be solved in forming a film.

[0007]

As a concrete means for solving the problems of the prior art, the present invention provides a paint supply means at one end of a pipe to be treated, and the paint supply means has a length and an inner diameter of the pipe to be treated. correspondingly charged collectively solvent-free two-component epoxy resin coating material composed of 10 to 20 percent more the main agent of the amount and the curing agent capable of forming the film thickness which is set in advance to, the
The paint is transformed into a slurry by the
As a result , a non-uniform coating film is formed all at once at a substantially intermediate portion of the pipe length, and the non-uniform coating film is successively blown annularly by the supplied air flow, and is substantially uniform over the entire length of the pipe. It is intended to provide a method for lining the inner surface of a pipe, which is formed as a coating film, wherein the paint supply means,
This includes a transparent or translucent working pipe extending from the pipe to be processed.

[0008]

[Function] A batch of paint is injected, and the paint is extruded at once by an air flow to reach a substantially middle portion of the pipe length to form a thick non-uniform coating film, and the uneven coating film is spread. Since it forms a uniform coating film, the time of blow-off, that is, the coating time is short, and the workability is excellent,
The coating film having a non-uniform thickness adhered to the inner wall of the pipe is blown out as an annular flow by the air flow flowing through the axial portion of the pipe, whereby a uniform coating film can be formed.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in more detail with reference to the illustrated embodiment. Reference numeral 1 denotes an existing pipe such as a water supply pipe, and the existing pipe includes a plurality of branch pipes 1a, 1b, 1c,.
Are branched and connected, and a discharge member such as a faucet is generally attached to an end of each branch pipe.

When regenerating existing pipes,
As shown in the drawing, after the discharge member is removed, the interior of the existing pipe 1 including the joint portion 2 and the branch pipes 1a, 1b, 1c,... Has been removed, and the inside has been dried and cleaned.

In the existing pipe 1 in which the inside is thus cleaned, lining is performed from each branch pipe from the distal end side of the pipe to the base end side (the side to which the meter is attached). In this case, the operation is performed in a state in which the branch pipes are divided for each branch pipe. For example, the section from the branch pipe 1a to the branch pipe 1b is defined as a section A, the section from the branch pipes 1b to 1c is defined as a section B, and the section C is successively followed. ,..., And lining is performed sequentially for each section.

In this lining, a working pipe 3 is extended to an end from which a discharge member such as a faucet is removed, that is, a branch pipe 1a in a section A, and a predetermined amount of paint is poured into the working pipe 3 to perform the work. An air supply pipe 4 connected to a suitable compressor is connected to the pipe 3, and air at a predetermined pressure is blown from the air supply pipe 4 to spread the paint and lining. In this case, the base end side is opened, and the other branch pipes are all closed.

The working tube 3 used may be, for example, U-shaped or L-shaped, and may be made of, for example, a steel tube or a plastic tube. So that you can see the painted paint
Transparent or translucent ones are preferred.

The amount of paint to be supplied is calculated in advance by calculating the pipe diameter and length in the section A, and calculating the amount of paint for forming a coating film having a predetermined thickness at the pipe diameter and length. An amount of paint substantially corresponding to the amount is supplied at once. The paint used here is preferably a solventless two-pack epoxy resin paint.

In the air supply, air having a predetermined pressure (air volume) set in advance is sent at a stretch. The air supply valve is a type of differential pressure valve that is generally used , and the air supply can be set arbitrarily. Set it according to the pipe diameter, pipe length, paint viscosity, etc. It is set so that air at a predetermined pressure calculated in advance can be sent.

By supplying the air at once, the paint 5 flows while the paint 5 is being applied to the pipe wall of the existing pipe 1 as a whole, as shown in FIG. The flow of the paint is in a state of a collective slag flow (hereinafter referred to as a metamorphic slag flow), and the application of the paint by the metamorphic slag flow is not of a constant thickness, but is relatively rough and irregular. It is in a state.

Then, when air of a predetermined pressure is subsequently supplied, as shown in FIG. 3, the paint of the metamorphic slag flow is reduced at a predetermined speed while reducing the amount by the amount applied sequentially to the pipe wall. Further, the coating material flows at a stroke to near the middle, and as shown in FIG. 4, the whole coating material becomes an annular flow near the middle. Even in this state, the paint adhering to the tube wall is in a non-uniform state and has a thickness almost twice as large as a predetermined thickness.

By continuing to supply air in this state, the paint is blown from the middle part of the section A to the end part while maintaining the annular flow, and the branch point of the branch pipe 1b and a position slightly beyond the branch point. To reach.

In this case, the paint flows to the substantially middle portion of the section A in a state where the paint is gathered and the thickness of the paint adhered to the pipe wall is uneven and irregular. As shown in FIG. 5, the surface layer portion of the non-uniform adhesion paint is successively blown in the flowing direction to flow in an annular flow, and the entire adhesion paint becomes the coating film 6 of the set thickness.

As described above, the coating material is made to flow all at once to the substantially middle portion of the pipe to be lined to form a non-uniform coating film, and then the coating material is made to flow as an annular flow to form a uniform coating film. Therefore, the coating time is remarkably reduced, and the air supply time for forming a uniform coating film is also reduced. Thus, a substantially uniform coating film can be formed as a whole.

In order to form a substantially uniform coating film from the start end to the end, the air supply time for blowing the paint is shortened. You may make it supply about 20% more paint. In particular, since the pipe diameter is increased and absorbed at the connection part such as the elbow and the cheese, there is no problem even if it is slightly larger.

Whether the paint has reached the end of section A is determined by
It can be detected by detecting the internal pressure of the branch pipe 1b. In other words, when the paint becomes an annular flow and slightly exceeds the branch point,
The internal pressure of the branch pipe 1b slightly increases, and this is detected to determine that the paint has reached.

After the arrival of the paint in section A is detected, the supply of air is stopped, and then lining is performed in section B. Also in this case, the working pipe 3 and the like are connected from the branch pipe 1b in the same manner as described above, a predetermined amount of paint calculated in advance is collectively supplied, and air is similarly supplied to perform lining.

In any case, paint necessary for forming a set coating film is collectively supplied to a pipe of a predetermined length to be lined, and the paint is blown all the way to the vicinity of the middle of the pipe. To form a non-uniform coating film, and the non-uniform coating film is successively blown out to flow into an annular flow, whereby a substantially uniform coating film can be formed on the entire pipe.

[0025]

As described above, according to the method for lining the inner surface of a pipe according to the present invention, a paint supply means is provided at one end of a pipe to be treated, and the paint supply means corresponds to the length and inner diameter of the pipe to be treated. A non-solvent type two-component epoxy resin paint composed of a base material and a curing agent, which is increased by 10 to 20% of an amount capable of forming a predetermined film thickness, is added at once, and the paint is
The metamorphic slag flow is generated by
A non-uniform coating film is formed at a stroke to a substantially middle part of the pipe length, and the non-uniform coating film is successively blown annularly by the supplied air flow to form a substantially uniform coating over the entire length of the pipe. By being formed, the lining time is remarkably shortened as compared with the conventional example by sequentially supplying the sealing material or the paint, and not only the workability is improved, but also the air supply time for blowing is shortened. In addition, the coating material to be supplied at a time is increased by 10 to 20% of the amount which can form the set film thickness. It has an excellent effect that a film can be formed.

[0026]

[Brief description of the drawings]

FIG. 1 is a schematic view schematically showing a part of an existing pipe for explaining a lining method of an inner surface of a pipe according to the present invention.

FIG. 2 is an enlarged cross-sectional view of a pipe for explaining an initial flow state of a paint lined by the lining method.

FIG. 3 is an enlarged cross-sectional view for explaining a flow state of paint in an intermediate portion of a pipe lined by the lining method.

FIG. 4 is an enlarged cross-sectional view for explaining a flow state of a paint past an intermediate portion of a pipe lined by the lining method.

FIG. 5 is an enlarged cross-sectional view for explaining a final coating film formation state of a pipe lined by the lining method.

[Description of Signs] 1 Existing piping 1a, 1b, 1c Branch pipe 2 Joint member 3 Working pipe 4 Air supply pipe 5 Paint 6 Uniformly blown coating A, B, C

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-114577 (JP, A) JP-A-57-102271 (JP, A) JP-A-57-110376 (JP, A) JP-A-4- 187270 (JP, A) JP-A-3-196876 (JP, A) JP-A-63-175677 (JP, A) JP-A-4-78964 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B05D 7/22 B05D 7/14 B05D 7/24 301 B05D 7/24 302 B05C 7/00-7/08

Claims (2)

(57) [Claims] 1. A paint supply means is provided at one end of a pipe to be treated, and the paint supply means has an amount of 10 to 20 that can form a film thickness preset according to the length and inner diameter of the pipe to be treated.
% Many were main agent and a solvent-free two-component epoxy resin paint was collectively charged comprising a curing agent, paint is once supplied
Is the place uneven coating is formed leading to a substantially intermediate portion of the pipe length at once becomes modified slug flow by air flow constant pressure, if extended blow sequentially annular by heterogeneous coating airflow supplied subsequently A method for lining the inner surface of a pipe, wherein the coating is formed as a substantially uniform coating over the entire length of the pipe. 2. The method according to claim 1, wherein the paint supply means is a transparent or translucent working pipe extending from the pipe to be processed.