JP4879093B2 - Water pipe lining method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for lining the inside of a pipe existing inside a building, which forms a thicker coating film on the inner surface of a first elbow at the side starting feeding a coating. <P>SOLUTION: After the coating film of a required thickness is formed over all the length of the pipe by dividing the pipe into coating sections of branched pipes, each of which ranges from a base end part side fitted with a meter of the existing pipe to a tip end part side, by feeding a coating from the end part elbow of the branched pipe in each coating section, and by blowing and expanding the coating toward the base end part side, the end part elbow 2a of each branched pipe is connected to a coating feed part 6 having a socket-shaped coating housing part 10 and to an air feed means 9 for heated fluids, the resistor of a top member 11 is arranged in the coating housing part 10, a required quantity of coating is housed therein, and coating is performed by spraying a coating of the coating housing part 11 through the air feed means 9 toward the end part elbow 2a. The thicker coating film is formed on the inside surface of the end part elbow 2a of the starting end part where a coating is fed and coating is performed, thereby producing a coating film of a well balanced thickness throughout. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  In order to rehabilitate existing water supply pipes installed in high-rise buildings such as apartment buildings or office buildings such as apartments, the present invention is to polish the inner surface of the pipes and deposits such as rust, scales and dirt The present invention relates to a method of lining using a solvent-free two-component epoxy resin paint after the scouring removal.

  Conventionally, as a rehabilitation method for this type of existing water supply pipe, there is a method in which the inner surface of the pipe is cleaned, and then a multi-layer lining is performed by applying a solvent-free two-component epoxy resin paint twice or repeatedly with an air supply fluid. It is known as a conventional example.

  As one of the known techniques, the cured and dried state is judged by touching the coating film with a finger after lining in the previous process (primary process), and the cured and dried state still has a possibility of flowing by blowing for lining. Because the lining of the next process (secondary process) is performed from the beginning to the middle stage of the remaining dry touch, the coating applied in the previous process has not yet become a smooth surface (substantially completely dry). Therefore, the flow friction resistance is relatively large, and the sliding flow of the paint in the next process is suppressed, and in particular, a relatively thick coating film can be formed at the joint portion of the pipe, and the soluble molecule in the paint can be formed. And / or because secondary coating is done at the stage where many polar groups remain, the coatings formed by the primary coating and the secondary coating are integrated by a crosslinking reaction to form a good coating film It is. (See Patent Document 1)

  Further, as another known technique, a storage chamber in which the paint is stored, first air supply means and second air supply means that communicate with the storage chamber and open to the top, And a connecting means to a processing pipe (existing pipe) provided on the side near the bottom, and the main lining (primary coating) is performed by extruding the paint in the storage chamber by air supply from the first air supply means, Subsequently, by supplying air from the second air supply means and performing the follow-up lining (secondary coating), the coating on the starting end side that occurs when the coating is put in and blown and lining is performed in particular. The defect that the film thickness becomes thin is corrected by the follow-up lining, and the whole is formed into a uniform thickness coating film. (See Patent Document 2)

JP-A-11-276990 JP-A-8-229488

  However, the invention disclosed in Patent Document 1 performs the lining of the next process from the initial stage to the middle stage of dry touch and further adds heating means so as not to be greatly affected by environmental conditions. The time is greatly shortened and the lining can be performed on the same day, and the paint is extruded at once and blown to near the middle of the lining section. At the stage of the spreading, the paint is looped from the metamorphic slag flow. In the state of an annular flow, paint is applied to the pipe wall to form a coating film, but since the air supply time for blowing and lining becomes longer, especially in the vicinity of the start end side ( There is a problem that the film thickness (from the first elbow to the second elbow) becomes thin.

  Further, in the invention disclosed in Patent Document 2, in performing the follow-up lining from the start end side to the vicinity of the substantially intermediate portion on the start end portion side where the coating film thickness is thin, the paint is formed in an annular flow near the start end side. It is made to flow, and the top of the coating film previously formed from the start end side to the vicinity of the middle part is overcoated, but the paint is a small amount to the middle part of the secondary coating section, The flow mode is an annular flow that is formed almost simultaneously with the air supply, and in the general arrangement state of the existing piping, it flows in the pipe over an air supply time that is not substantially different from the primary coating. In addition, since the coating surface before the gelation point that has been primarily coated is air-flowed, there is a problem that the effect of overcoating in the first elbow part hardly appears.

  Therefore, even in the conventional multi-layer coating by primary coating and secondary coating, since the coating film is formed by spreading the paint, the film thickness on the start end side including the first elbow of the existing pipe to be painted is Therefore, there is a problem to be solved by providing a lining method capable of solving this problem and ensuring a sufficient film thickness on the start end side.

  As a specific means for solving the above-mentioned problem, the present invention supplies a solvent-free two-component epoxy resin paint after cleaning the inside of an existing pipe that is piped in a building and branches a plurality of branch pipes. A lining method in which a coating film having a required thickness is formed on the inner surface of a pipe by blowing with a fluid, and a coating section is provided for each branched branch pipe from a base end side to a tip end side to which a meter in the existing pipe is attached. , And paint is supplied from the end elbow of each branch pipe divided into each divided paint section, and the paint is blown toward the base end side to form a coating film with the required thickness over the entire length of the pipe After that, a paint supply part having a socket-like paint storage part and an air supply means for heating fluid are connected to the end elbows of the branched branch pipes, and a resistor for the piece member is connected to the socket-like paint storage part. Arrangement and required amount of paint Accommodated, a lining process for the most important feature be painted by spraying paint in the paint storage unit to an end elbow by blowing means.

  Further, in the present invention, the coating film formed over the entire length of the pipe is formed by primary coating and secondary coating; the coating film formed on the end elbow of the branch pipe is formed by tertiary coating; After the coating film is formed, the gas heated to 70 to 80 ° C. is supplied and dried; in the secondary coating and the tertiary coating, the coating applied before is at least from the dry initial stage to the middle stage. To do in between; as an additional requirement.

  The water pipe lining method according to the present invention is basically obtained by supplying paint from the end elbow of each branch pipe branched into each divided paint section and blowing the paint toward the base end side to obtain the required thickness. After the coating film is formed over the entire length of the pipe, a paint supply part having a socket-like paint storage part and a heating fluid supply means are connected to the end elbows of the branched branch pipes, and the socket-like paint storage The top member is provided with a resistor, and a required amount of paint is accommodated, and the paint in the paint storage part is sprayed onto the end elbow by the air supply means, whereby the paint is supplied and painting is performed. Since the coating film on the inner surface of the end elbow on the start end side can be formed thick, there is an advantage that a coating film having a well-balanced thickness can be formed as a whole.

  Next, a lining method according to the present invention will be described based on the specific embodiments shown in the drawings. FIG. 1 shows an example of existing piping to be painted. In this existing pipe 1, a plurality of branch pipes 1a, 1b, 1c,... Are branched and connected through appropriate joint members, and generally a joint member, that is, a first member is provided on the free end side of each branch pipe. A discharge member such as a faucet is attached through elbows 2a, 2b, 2c,. In addition, joint members, that is, second elbows 3a, 3b, 3c,... Are also provided at the rising portions of the branch pipes 1a, 1b, 1c,. It is connected via third joint members (cheese) 4b, 4c,..., And the base end side is a meter mounting end 1f. When the branched branch pipe is bent a plurality of times, it is natural that the fourth to fifth elbows are interposed in the bent portion in the middle.

  In the case where lining is performed for regeneration in such an existing pipe 1, the first elbows 2 a, 2 b, 2 c,... 3 and the joint pipes 4b, 4c,... And the branch pipes 1a, 1b, 1c,... The lining is performed after the interior is dried and cleaned.

  As one method of lining, in the existing pipe 1 in a state where the inside is cleaned, the inside is lined from the tip end side of the branch pipe 1a to the base end side of the meter attachment end 1f to which the meter is attached. In this case, the lining is performed in a state of being divided for each branch pipe. For example, in the case of the branch pipe 1a on the distal end side, the section A extends to the meter attachment end 1f on the proximal end side. The branch pipe 1b is divided into sections C, D,... In accordance with the section B up to the third joint member 4b at the branch point, and the paint is supplied to each divided section in a lump. Then, the lining is sequentially performed by a blowing means using air of a predetermined pressure.

  The amount of paint to be added is calculated in advance by calculating the pipe diameter and length of each section, and by calculating the amount of paint that forms a coating film with a predetermined thickness at that pipe diameter and length. The amount of paint that is increased by the required amount is added to the amount that has been added. As an example of the coating material used, for example, 300 cc / pot life is about 4 to 7 minutes at an environmental temperature of 25 ° C., the viscosity during flow is about 12000 to 20000 cps, and the thixotropic property is Ti value 3.0. It is a solvent-free two-component epoxy resin paint of about ~ 5.0, and is a well-known paint.

  In an actual lining, a working tube capable of storing a required amount of paint is attached in advance to the distal end side of each branch tube 1a, 1b, 1c... A means for supplying air is connected. Then, a predetermined amount of paint is collectively stored in the working tube, and the paint is sent out and lined by the air supply fluid from the air supply means.

  Since a paint having a relatively short pot life is used, primary coating and secondary coating are performed for each branch pipe. First, painting is started from section B, and lining is performed in the order of sections C, D,. In the primary coating in the section B, paint is introduced from the end of the branch pipe 1b and blown up by the air supply fluid to reach the third joint member 4b at the branch point. In the initial stage of the blowing, the paint flows in the metamorphic slag flow, then changes to an annular flow, and reaches the third joint member 4b at the branch point of the branch pipe 1b while applying the paint to the pipe wall. The joint member 4b is applied to a position slightly exceeding.

  Subsequently, the secondary coating of the section B is performed. In this case, when the primary coating film is dry to the touch, that is, when the paint is hardened to such an extent that the paint hardly flows, that is, depending on the environment, it is still partly attached to the finger. In secondary coating.

  This secondary coating is based on the position from the first elbow 2b of the branch pipe 1b to the position of the second elbow 3b, and the amount of paint reaching the position approximately 30 to 50% beyond that position is described above. In the same way as the primary coating, it is charged all at once, and it is made to flow by the air supply fluid.

  Next, the section C is lined. In this case as well, primary coating and secondary coating are performed in the same manner as described above. First, paint is applied from the end of the branch pipe 1c in the primary coating and is blown out by the air-feeding fluid to change from the metamorphic slag flow to the annular flow. Then, the coating is applied to the pipe wall while reaching the third joint member 4c at the branch point, and is applied to a position slightly beyond the third joint member 4c.

  Subsequently, the secondary coating of section C is performed. Even in this case, when the coating film of the primary coating is in the initial touch dry state, the position from the first elbow 2c of the branch pipe 1c to the position of the second elbow 3c is set to be approximately 30 to beyond that position. In the same manner as the primary coating, an amount of paint that reaches a position 50% ahead is charged all at once, and the coating is performed by flowing with an air supply fluid. Hereinafter, similarly, primary coating and secondary coating are performed for the other sections D,.

  Finally, the section A is lined. Also in this case, first, the primary coating is performed by batch-feeding the paint from the distal end portion of the branch pipe 1a, blowing the paint to the meter mounting end portion 1f on the base end side with the air supply fluid, and from the metamorphic slag flow on the way Change to an annular flow and paint on the pipe wall. Since the length of the piping in this section A is relatively long, a large amount of paint calculated corresponding to the length is introduced, and the air supply time for blowing is increased accordingly.

  In the section A, after the primary coating is completed, the secondary coating is performed in the same manner as in the section. In this case, the amount of secondary coating is such that the position from the first elbow 2a of the branch pipe 1a to the position of the second elbow 3a reaches a position approximately 40 to 50% beyond that position. In the same manner as in the primary coating, the above coating materials are charged in a lump and flowed with an air supply fluid to perform coating. In particular, in the case of the branch pipe 1a, since the length from the second elbow 3a to the meter attachment end 1f on the base end side is long, it is preferable that the branch pipe 1b branches beyond the second elbow 3a. It is better to apply and paint an amount of paint capable of maintaining the modified slag flow up to the third joint member 4b.

  In any of the sections described above, the blown-out coating with the air supply fluid of the paint is such that the paint that has been charged in a batch flows as a metamorphic slag flow until approximately the middle of each section, and then flows as an annular flow. Both the flow and the annular flow can flow and be painted so as to be pressed against the pipe wall.

  In addition, the blown-up coating with the air supply fluid in the primary coating is an amount obtained by increasing the amount of the paint charged in each section by about 10 to 20% of the calculated amount. Are painted in a circular flow from the start end side of each branch pipe 1a, 1b, 1c,... To the second elbow 3a, 3b, 3c,. The thickness gradually increases from slightly beyond the elbow, and between the first elbows 2a, 2b, 2c... On the start end side and the third joint members 4b, 4c,. There is a relatively large variation in the coating thickness, and the coating film that has been applied as a whole has a non-uniform coating distribution in which the start side is necessarily thin and the end side is thick in the pipe length direction of each coating section. .

  However, the non-uniform paint distribution is corrected by overcoating by secondary coating to form a coating film having a substantially uniform thickness as a whole. In the case of secondary coating in each branch pipe, there are some parts that need to be adjusted by adjusting the air pressure, air volume, etc., but as with the primary coating as a whole, the applied paint is fed almost uniformly by the air supply fluid. The inside of a pipe is made to flow in the state of metamorphic slag flow, and air supply is stopped when metamorphic slag flow collapses. This is approximately 1/3 to 1/4 of the primary coating time in each branch pipe.

  Accordingly, the distribution of the paint in the secondary coating will be described. It flows while being maintained in the transformed slag flow by the air supply fluid, and flows to a position exceeding the second elbows 3b, 3c,. The start side in the flow direction is thick and the end side is thin. In other words, in the case of a metamorphic slag flow, since it is pushed by the air supply fluid and flows, the amount of the tip side of the flowing paint gradually decreases, so the tip side where the paint flows is inevitably thin and the rear end side is In order to maintain the distribution state, the air supply is stopped when the metamorphic slag flow collapses in order to maintain the distribution state. Note that if the air supply fluid continues to be supplied after the metamorphic slag flow collapses and the air supply time is lengthened, the rear end side paint flows to the front end side in an annular flow and the front end is the same as in the primary coating. The side becomes a thick coating state, which is not preferable.

  The coating film formed by this secondary coating is formed in layers on the coating film of the primary coating, and the air supply fluid supply stops when the metamorphic slag flow collapses. Is formed on the thin coating between the first elbows 2a, 2b, 2c,... And the second elbows 3a, 3b, 3c,. By this, it is possible to adjust the imbalance of the coating film distribution by the primary coating. Therefore, the time when the metamorphic slag flow in the secondary coating collapses is an arbitrary position slightly beyond the vicinity of the second elbow in each section. In short, the secondary coating is a coating for correcting the thin film portion of the coating film by the primary coating, that is, the coating film to the position mainly exceeding the second elbow on the start end side in each section.

  And the air supply time to the collapse of the metamorphic slag flow is generally within 1 to 5 sec, depending on the installation situation of the piping, and the collapse condition is reduced by reducing the air supply resistance due to the collapse of the metamorphic slag flow. Can be detected. Further, the stop of the air supply may be selectively continued in the range of 3 to 20 sec (partially in the initial state of the annular flow) after the metamorphic slag flow collapses, for example, depending on the installation situation of the piping.

  If necessary depending on the environment after the completion of the secondary coating, the air supply fluid maintained at a predetermined temperature by appropriate heating means with the meter mounting end 1f on the other end side opened is provided to each branch pipe. The applied paint (coating film) may be heat-cured by introducing it from the ends of 1a, 1b, 1c,. In other words, by heating the paint, the hardening reaction of the paint (formation speed of chain molecular structure) is accelerated, the time to reach the gel point on the coating surface can be shortened, and the crosslinking reaction that proceeds after the gel point As a result, the coating film of the primary coating and the secondary coating are integrated to form a coating film having a required thickness.

  Tertiary coating is performed when the coating film integrated by this air supply changes from the initial stage of dry touch to the middle stage of dry touch. The tertiary coating in this case is mainly for coating the first elbows 2a, 2b, 3c,... In each branch pipe, and as shown in FIG. 2, the coating means completely different from the primary coating or the secondary coating. Are connected to the first elbows 2a, 2b, 3c,... Of the branch pipes 1a, 1b, 1c,.

  That is, the painting means is generally composed of the paint supply unit 6, the temperature sensor 7, the heating means 8, and the air blowing means 9. The paint supply part 6 is provided with a funnel-shaped socket-like paint storage part 10 for charging paint, and a top member 11 serving as a resistor for restricting the extrusion of the paint in the paint storage part 10. And a plug 12 is screwed into the opening of the paint storage unit 10 so that it can be covered.

  A heating element 13 that generates heat electrically is provided inside the heating means 8, and the heating element 13 has a heat generation intensity controlled by a control unit 14. It is controlled to the temperature set by the temperature information. In addition, about the heating apparatus which has the temperature sensor 7 and the heating means 8, what was described in Unexamined-Japanese-Patent No. 11-24477 to the same applicant can be used as it is.

  The air blowing means 9 is connected to, for example, a suitable compressor and can set the required air volume to blow air. In this tertiary coating, the first elbow is mainly coated. Further, it takes only a short time (3-6 seconds) for blowing and blowing (3 to 6 seconds), and it may be heated and supplied from the beginning at the time of blowing, or may be heated and supplied in the drying process after blowing.

  By the way, specific numerical values related to the tertiary coating are as follows. The pot life of the paint is about 4 to 5 minutes at 25 ° C., the Ti value of the paint is about 4.0 to 5.0, and the amount of paint input is about 25 to 35 cc. The wind speed is about 3 to 5 m / sec, the temperature is about 70 to 80 ° C., and the blowing time is about 2 to 6 minutes. In addition, temperature and ventilation time may fluctuate | variate greatly with external temperature.

  As shown in FIG. 3, the top member 11 disposed in the paint storage part 10 of the paint supply part 6 is formed in a bulging part 11b that bulges below the columnar part 11a having a required length. In order to maintain the posture, a plurality of rod-shaped members 11c are formed so as to project in a direction orthogonal to the vertical position. Further, a hole 11d for picking up from the paint storage unit 10 is provided near the upper end of the columnar part.

  The state of tertiary coating using such a coating means will be described with reference to FIG. 4. First, the top member 11 is disposed in the paint storage portion 10 for charging paint, and then the paint storage portion 10. When approximately 25 cc of paint 15 is placed inside, for example, the heating element 13 of the heating means 8 is energized to be in a heated state, and when the air is supplied from the blowing means 9 at, for example, a wind speed of about 5 m / sec, it is heated to 80 ° C. The air flow spreads the paint 15.

  In this case, the top member 11 disposed in the paint storage part 10 has the bulging part 11b abutting against the wall surface of the paint supply part 6 and stops at a substantially intermediate position, and most of the columnar part 11a is paint storage. The posture is maintained in the portion 10 and is in a stationary state, and the top member 11 does not swing even if the paint 15 put in by air supply flows.

  By the supply of air from the blowing means 9, the paint around the bulging portion 11b flows in a lump and is applied to the inner surface of the first elbow 2a. Thereafter, the paint in the paint storage unit 10 flows in the direction of the first elbow 2a along the wall on the upper surface side of the paint supply unit 6 by air supply, and as shown in FIG. In the upper position in 2a, it coats as a comparatively thick coating film 15a on the thin coating film 5 formed by primary coating and secondary coating.

  By this tertiary coating, the paint remaining in the paint container 10 is blown and applied to the inner upper surface of the first elbow 2a by blowing air at a wind speed of 5 m / sec heated to 80 °. The air supply time is about 1 to 2 seconds at most, and thereafter, the air speed and temperature are maintained and dry air supply is performed for the required time (about 6 minutes). It is natural that the paint flows down from the first elbow 2a also by this air supply, and the coating film 15a having a required thickness is formed on the lower side of the first elbow 2a. Thus, it has been found that the coating on the inner wall of the second elbow 3a is corrected to a uniform thickness. In any case, if the air flow is weakened and dry air feeding is performed, the coating film 15a by the tertiary coating still has fluidity, so it naturally flows down from the first elbow 2a and also enters the inside of the branch pipe 1a. Form a coating film.

  In this way, in each branch pipe, the third coating is mainly performed on the first elbows 2a, 2b, 2c,..., So that the coating film by the tertiary coating is formed on the coating film 5 formed by the primary coating and the secondary coating. 15a can be repeatedly applied, and since the tertiary coating is performed before the coating film 5 formed by the primary coating and the secondary coating is completely dried, the coating film 5 and the coating film 15a of the tertiary coating are A cross-linking reaction is promoted between molecules, and an integrated thick film can be formed.

  A lining method in which a non-solvent type two-component epoxy resin paint is applied to the inside of an existing pipe such as a water supply pipe that is piped in a building, and one end of each branch pipe in the existing pipe made of a plurality of branch pipes In the case of a lining in which paint is supplied from the part side and blown and applied, the process consists of a process of forming a secondary paint film on the primary paint film in order to eliminate variations in the paint film thickness. However, even if a coating film is formed by primary coating and secondary coating, the inside of the branch pipe from the first elbow on the coating material supply side to the second elbow, particularly in the first elbow, Since the blowing gas continues to be supplied to the starting end of the supply, the paint flows due to the blowing gas, and even if the paint is applied repeatedly, the coating film can only be formed thin. By tertiary painting It is possible to form a coating film with a sufficient film thickness and is not limited to water supply pipes as existing pipes, for example, in pipe rehabilitation such as hot water pipes or other pipes installed in factories, etc. In particular, the lining method of the present invention can be used.

It is explanatory drawing which showed schematically the condition of the water pipe in the apartment house which can apply the lining method of the Example which concerns on this invention. It is the side view which showed schematically the coating means used for tertiary coating in implementation of the lining method. It is the side view which showed the top member integrated in the inside of the coating means. It is the side view which expanded and fractured | ruptured only the principal part of the coating means, and was shown schematically. It is the expanded sectional view which showed schematically the inside of the 1st elbow painted by the lining method of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Existing piping 1a, 1b, 1c, 1d ... Branch pipe 1f Meter attachment end 2a, 2b, 2c, 2d ... 1st elbow (joint member)
3a, 3b, 3c, 3d ... second elbow (joint member)
4b, 4c, 4d ... Third joint member (cheese)
5 Coating film by primary coating and secondary coating 6 Paint supply part 7 Temperature sensor 8 Heating means 9 Blowing means 10 Socket-shaped paint storage part 11 Top member 12 Plug 13 Heating element 14 Control part 15 Paint 15a Coating film by tertiary coating A , B, C, D Section divided once

Claims (5)

After cleaning the inside of an existing pipe that is piped in a building and branching a plurality of branch pipes, a solvent-free two-component epoxy resin paint is blown off with an air supply fluid to coat the inner surface of the pipe with the required thickness A lining method for forming
The paint section is divided for each branch pipe from the base end side to the tip end side to which the meter in the existing pipe is attached, and the paint section is divided into paint pipes from the end elbows of the branch pipes. To form a coating film of the required thickness over the entire length of the pipe by blowing the paint toward the base end side,
A paint supply unit having a socket-like paint storage unit and an air supply means for heated fluid are connected to the end elbow of each branched branch pipe,
Dispose the resistor of the top member in the paint storage section and store the required amount of paint,
A water pipe lining method, characterized in that the paint in the paint container is sprayed onto the end elbow by air supply means. The lining method for a water supply pipe according to claim 1, wherein the coating film formed over the entire length of the pipe is formed by primary coating and secondary coating. The lining method for a water supply pipe according to claim 1, wherein the coating film formed on the end elbow of the branch pipe is formed by tertiary coating. The lining method for a water supply pipe according to any one of claims 1 to 3, wherein after the coating film is formed by tertiary coating, a gas heated to 70 to 80 ° C is supplied and dried. The method for lining a water supply pipe according to any one of claims 1 to 4, wherein the secondary coating and the tertiary coating are performed at least during the period from the initial touch to the middle of the dry-to-touch coating film.

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