JP2000279882A - Method for lining inner surface of pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a thick, uniform membrane efficiently and to improve work properties by a method in which the coating arrival end part of a lining section formed by dividing a pipe to be treated into sections is made as a coating supply end part, hot air is supplied from both end parts to accelerate the curing of a lining film, and the sections are lined in turn. SOLUTION: The inside of a pipe 1 in which branch pipes 1a, 1b, 1c,... are branched/connected through joints of existing piping such as a water supply pipe is heated, dried, and cleaned by removing fouling such as scale, when a section A is coated, the end part (1) of the branch pipe 1a is made as a coating supply end part, the end part (2) of the branch pipe 1b is made as a coating arrival end part, and lining is carried out in turn. Into a work pipe for supplying coating materials fitted to an end part (e.g. the branch pipe 1a) with a discharge member such as a faucet removed, the coating material in an amount to be able to coat each divided section is charged at a time and pushed/fluidized by a hot compressed air flow, and after coating, the curing of the coating film is accelerated by hot air from both end parts of the section. In this way, a good, thick coating film can be formed efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a pipe, such as an existing water supply pipe, installed in a building. The present invention relates to a lining method for forming a coating film having a predetermined thickness on the inner surface of a pipe blown by a hot air flow.

[0002]

2. Description of the Related Art As a technique for lining an inner surface of a pipe twice, for example, a technique disclosed in Japanese Patent Publication No. 4-34463 is known as a conventional example.

[0003] In this conventional technique, a method is used in which a liquid lining material is caused to flow along an inner wall surface of a pipe by an air current and the inner wall surface of a branch pipe having a plurality of openings is lined. The lining material and the supply point of the airflow are sequentially moved while setting the point as the supply point of the lining material and the airflow in the next lining, and all the openings of the conduit forming the branch conduit are at least once at the supply point and This is a lining method in which the lining material is reciprocated by the same number of times inside all the pipes forming the branch pipes as well as the discharge location.

[0004]

According to the lining method of the prior art, the coating material is caused to reciprocate. In this case, the reciprocating flow is performed while the coating material applied by flowing in the outward path is not dried. In addition, the paint on the return path is supplied and applied by flow, and the paint supplied on the outward path also flows together with the paint supplied on the return path, and a uniform film cannot be formed by such reciprocating flow. For some reasons, it has not been put to practical use yet.

In other words, even if the previously applied and applied paint is applied twice while supplying new paint in a fluid state, the coating cannot be made substantially thicker or uniform. is there. In particular, if the paint applied in the elbow is in an undried state, the paint at the abutting portion will be pushed away and thinned even if it flows from any direction, and a uniform and thick film will not be formed.

Further, since the coating material in this conventional example is supplied by a mixing injector, it is sequentially supplied in the form of a spray. It can be understood that the paint supplied in the forward pass reciprocates and flows along with the paint supplied in the return pass to form a film, and as a result, the film is formed by the flow in the return pass direction. As described above, there is a problem that a thick uniform film cannot be formed.

In the lining method in the above-mentioned conventional example, there is no intention to introduce a drying step for each path divided in the painting step. Even if the drying step is introduced, it is necessary to introduce a drying step for each path. There is a problem that the mixing injector must be removed, the workability is poor, and it takes too much time, so that the same day of the painting process cannot be performed substantially.

Therefore, the conventional example has problems that must be solved to efficiently form a thick uniform film and to improve workability.

[0009]

According to the present invention, there is provided a method for lining a pipe to be treated having a plurality of branch pipes, wherein the lining section of the pipe to be treated is divided into a plurality of sections. However, after the lining of each section, the lining of the coated film is one in which the curing reaction is promoted by the supply of warm air, one selected lining section is lined, and each subsequent lining section is Lining is performed sequentially with the paint reaching end of the lining section as the paint supply end, and the heated air after lining for each section is supplied from the paint supply end side and the paint reaching end side of the lined section from both ends. Air is supplied, and the supplied heated air is discharged from the paint reaching end in the next lining section, and the lining and the supply of the heated air are repeated. There is provided a lining method of the pipe inner surface, characterized in that the lining back.

In the present invention, in the lining of each section, paint is applied collectively in such an amount that a predetermined film thickness can be formed corresponding to the length and inner diameter of the pipe to be processed in each section. , From a metamorphic slag flow by a heated air flow to be blown sequentially to an annular flow to form a coating film,
A transparent pipe of a predetermined length is connected to the paint reaching end side of each lining section to detect the arrival of the paint visually, and after finishing the lining of each section, heating air for finishing is provided. As an additional requirement.

In the present invention, the lining of each section is repeatedly moved while the lining and the supply of the heated air are sequentially moved to the next section, so that the coated film in each section is supplied with the heated air. Since the curing reaction is accelerated by the air to be in a pseudo-cured state, it does not flow even if lining is performed in the next section, so that a good thick coating film can be efficiently formed.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in more detail with reference to the illustrated embodiment. In FIG. 1, reference numeral 1 schematically shows an entire existing pipe such as a water supply pipe. Corresponds to a so-called pipe to be processed in the present invention. A plurality of branch pipes 1a, 1b, 1c,... Are branched and connected through joints, and the pipes 1 are changed in direction. A discharge member such as a faucet is attached. Note that M
Is the end where the meter is attached.

When regenerating such existing pipes as pipes to be treated, after removing the discharge member of each branch pipe, the inside of the pipe including the joints and the branch pipes 1a, 1b, 1c,. Rust, scales, and other stains are removed in advance by an appropriate cleaning means, and the inside is heated and dried to be cleaned.

In the pipe to be treated 1 whose interior has been cleaned in this way, for example, lining is performed sequentially from each branch pipe toward the base end (end M to which the meter is attached) from the distal end of the pipe. . In this case, it is performed in a state where the branch pipes are divided for the time being,
For example from the end of the branch pipe 1a to the end of the branch pipe 1b and the first section A including the branch point X _1, the second section including the branching point X ₂ from the end of the branch pipe 1b to the end portion of the branch pipe 1c and by B, the following sequence, including the branch point X ₃ from the end of the branch pipe 1c to follow it to the end of the branch pipe 1d and the third section C, branch pipe 1d from end to meter mounting end M fourth
, The section from the meter mounting end M to the end of the branch pipe 1a is temporarily classified as a fifth section E, and lining is sequentially performed for each section.

In this lining, as shown in FIG. 2, working pipes 2 for supplying paint are attached to ends (for example, branch pipes 1a) from which a discharge member such as a faucet has been removed. A batch of paint is applied in an amount capable of coating each of the divided sections, and the batch of paint is pushed out by a predetermined compressed heated air flow supplied through heating means 3, It is made to flow while changing from the metamorphic slag flow to the annular flow, and is applied.

The working pipe 2 is, for example, a flexible and transparent resin pipe, in which the paint put into the work pipe can be visually recognized, and when the paint reaches the reaching end of the paint in each section, the paint reaches the pipe. You can see it. The heating means 3 is equipped with a temperature detecting means 4, an air volume and temperature controlling means 5, a connecting portion 6 to a compressor, and the like. 1
The methods described in Japanese Patent Application No. 0-53189 and Japanese Patent Application No. 10-79001 and the drawings and the manner of use thereof can be applied as they are. Note that when the outside air temperature is 25 ° C. or higher in summer or the like, heating during lining can be omitted.

The supplied paint is, for example, a solvent-free epoxy resin-based paint. The amount of the paint is calculated in advance based on the assumption that the pipe diameter, the pipe length, and the predetermined film thickness in each section are formed. Then, it is thrown in about 10 to 30% more than the calculated amount. The reason for this is that there is nobody, or there is accumulation in the joints, so that extra paint is required.

When the first section A is to be painted, the end of the branch pipe 1a serves as a paint supply end, and the end of the branch pipe 1b serves as a paint arrival end. The paint flows from the working pipe 2 provided at the end of the branch pipe 1a by the heated air flow to be blown, spreads and is lined, and whether or not the paint reaches the end of the branch pipe 1b is determined at the end of the branch pipe 1b. It can be visually confirmed in the provided work tube 2. In this case, only the end of the branch pipe 1b is released, and the other branch pipe 1c and the meter mounting end M are closed.

In this section A, when the arrival of the paint at the end of the branch pipe 1b is confirmed, the air supply is stopped and the branch pipe 1b is stopped.
b, the heating means 3 is also attached to the end, and the end of the branch pipe 1c serving as the paint arrival end in the second section B, which is the next lining section, is released. Heating air is simultaneously supplied from the end of the section 1b to accelerate the curing reaction of the coating film formed in the section A. That is, the heated air is sent to the end, and then to the end.

At this time, the temperature of the heated air is in the range of 25 to 75 ° C., preferably 30 to 65 ° C., and the amount of the supplied air is such that the coating film does not flow.
For the appropriate setting and in a range of 0.3m ³ ~0.7m ³
The air supply time is appropriately set and controlled in the range of 2 to 20 minutes. However, when the outside air temperature is extremely low in a cold region or in winter, air is further extended for about 5 to 15 minutes. By this air supply, the curing reaction of the coating film is promoted, and the state of pseudo-curing or the middle of touch drying is reached (applied to the finger when pressed slightly with a finger). become. Further, since the branch pipe 1c on which the coating film is not formed is heated by the passage of the heating air, the curing reaction of the coating film adhered in the next lining is further promoted.

After the lining of the first section A is completed and the supply of the heated air for the set time is completed, the coating of the second section B is performed. Again, was charged collectively a predetermined amount of paint working tube second end side of the branch pipe 1b, it sends a warm air from the heating means 3 the paint is flowing, beyond the branch point X ₂ branch pipe Lining is performed to the end of 1c, and it is visually detected whether or not the paint has reached the transparent working tube 2 provided at the end. Also in this case, the other branch pipes and the meter mounting end are closed.

In this section B, the heating means 3 is also attached to the end of the branch pipe 1c in the same manner as described above, and the branch pipe 1d to be the paint reaching end of the second section C, which is the next lining section. The end is released, and from the end of the branch pipe 1b and the end of the branch pipe 1c in the section B,
Heated air is simultaneously supplied so that the end portion becomes the end portion, thereby promoting the curing reaction of the coating film formed in the section B.

The third section C and the fourth section D are lined in the same manner as described above, and finally the fifth section E is lined. In this case, since the distance from the meter mounting end M to the end of the branch pipe 1a is considerably long, the lining time is slightly longer than in other sections. Then, after the lining, for example, the end of the branch pipe 1b located at a substantially intermediate portion is set in the released state, and the end of the branch pipe 1a and the meter mounting end M, that is, the end, M → end. Then, heated air is simultaneously supplied to accelerate the curing reaction of the coating film formed in the section E.

When the lining step is to be terminated at this stage (two coats), it is possible to further accelerate the hardening reaction by feeding the finished heated air to the entire pipe. In this case, the heated air is supplied from the ends of the selected plurality of branch pipes, and the ends of the other plurality of branch pipes are left open to serve as the outlet for the heated air. In short, it suffices that the warmed air to be finished pass through the entire pipe.

By sequentially lining the paint reaching end of the previously lined section as the paint supply end in the next section, the entire pipe to be processed is lined reciprocally, and each section is lined up. After the lining, warm air is sent to accelerate the curing reaction of the coating film to about the middle stage of pseudo-curing or touch drying, so that it does not flow in the next lining step, and a part of the next lining section (Pipe where no coating film is formed)
Is heated and contributes to the promotion of the curing reaction of the adhered paint. By repeatedly and alternately performing the lining and the supply of heated air, a high-quality and thick coating can be efficiently and promptly formed. It can be formed into

In the above description, among the divided lining sections, the first section A furthest from the meter mounting end M is selected as the section to be lined first. The lining may be started from the fifth section E. In this case, the working pipe 2 and the heating means 3 are provided at the meter mounting end M, the transparent working pipe 2 is provided at the end of the branch pipe 1a, and the other branch pipes 1b to 1d are closed to mount the meter. The paint is supplied from the end M side so that the end of the branch pipe 1a is the arrival end of the paint.

After confirming that the lining paint has reached the end of the branch pipe 1a, the supply of warm air for lining is stopped, and the heating means 3 is also attached to the end of the branch pipe 1a. To the released state, and ends M,
→ Warm air is supplied for a predetermined time so as to reach the end, and the coating film in the lining section E is cured.

Further, when lining the next lining section A, since the end of the branch pipe 1a is the arrival end of the paint in the previous lining, the end of the branch pipe 1a is used as the paint supply end and the heating is performed. Branch pipe 1b that discharges air
The lining section A is lined with the end of the lining as the reaching end of the paint. Hereinafter, in the same manner as described above, the lining section is sequentially moved, and the lining and the supply of heated air are performed for each section to line the entirety of the pipe 1 to be processed.

As for the supply of the heated air after the lining, for example, air is continuously supplied for 10 minutes or twice or three times at intervals of 2 minutes. It is also possible to make a cooling state or to forcibly blow cold air by another system to perform forced cooling. That is, it suffices that the supply of warm air and the supply of cool air are alternately performed to pseudo-harden the surface of the coating film so that the lining does not flow.

In any case, a lining section is set for the pipe to be treated having a plurality of branch pipes to be lined, and the paint reaching end of the lining section is sequentially set as the paint supply end of the next lining. By repeating lining and air supply, the entire section, that is, the entire pipe to be processed can be easily applied twice in a reciprocating manner, so that a coating film having a predetermined thickness can be easily formed. In addition, the lining time is shortened, and the construction can be performed on the same day.

[0031]

As described above, the lining method for the inner surface of a pipe according to the present invention is a method for lining a pipe to be treated having a plurality of branch pipes, wherein the lining section of the pipe to be treated is divided into a plurality of sections. After the lining of each section, the lining coating is one in which the curing reaction is promoted by the supply of warm air, one selected lining section is lined, and each subsequent lining section is the same as the previous lining section. Lining is performed sequentially with the paint arrival end as the paint supply end, and the heated air after lining for each section is sent from both ends of the paint supply end side and paint arrival end side of the lined section. ,
The supplied warmed air is discharged from the paint reaching end side of the next lining section, and the lining is repeated by repeatedly supplying the heated air to the lining section. Since the cured coating is promoted to a pseudo-cured state by the supply of warm air, the coating does not flow even if lining is performed in the next section, so that a high-quality and thick coating can be efficiently formed. It has excellent effects.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram schematically showing a state of a pipe to be processed for explaining a lining method of an inner surface of a pipe according to the present invention.

FIG. 2 is a schematic side view showing an example of a working pipe and a heating means connected to one end of a pipe to be treated lined by the lining method.

[Explanation of symbols]

1 treated pipes 1a, 1b, 1c, 1d branch pipe-end 2 working tube 3 heating means 4 temperature detector 5 control means 6 connecting portions A, B, C, D, E tentatively classified the interval X ₁ to X ₃ branch Point M meter connection end

Claims (4)

[Claims] In a lining method of a pipe to be treated having a plurality of branch pipes, a lining section of the pipe to be treated is divided into a plurality of sections, and after each section is lined, the coated film is supplied with heated air. The curing reaction is accelerated by this, one selected lining section is lined, and each subsequent lining section sequentially performs lining with the paint reaching end of the previous lining section as the paint supply end. The heated air after lining for each section is supplied from both ends on the paint supply end side and the paint arrival end side of the lined section, and the supplied heated air reaches the paint in the next lining section. A lining method for an inner surface of a pipe, wherein lining is performed by repeatedly discharging the lining and the supply of heated air so that the lining is discharged from an end side. 2. The lining of each section is heated at a time by applying a quantity of paint capable of forming a film thickness set in advance corresponding to the length and inner diameter of a pipe to be processed in each section, and heating. The method for lining the inner surface of a pipe according to claim 1, wherein a coating film is formed by blowing the metamorphic slag flow from the metamorphic slag flow to the annular flow in order. 3. A transparent tube having a predetermined length is connected to a paint reaching end side of each lining section, and the arrival of the paint is visually detected.
A lining method for an inner surface of a pipe according to the above. 4. The lining method for a pipe inner surface according to claim 1, wherein after finishing the lining of each section, warming air for finishing is supplied over all the pipes.