JPH026882A - Method of finishing newly installed piping - Google Patents

Abstract

PURPOSE:To allow the long-term use of a newly installed piping over a long period of time by blowing silica sand together with swirling air flow into the piping to grind the inside surface of the piping, then supplying a resin paint together with the swirling air into the piping to form a resin coated film. CONSTITUTION:A compressor and silica sand housing container are connected to the newly installed piping prior to mounting of a meter and faucet to the respective ends of the piping and the silica sand is introduced by the swirling compressed air into the piping to polish the inside surface back and forth. Thread parts 6, the sharp parts and burrs, etc., of a lined steel pipe 1 exposed in the juncture between the steel pipe 1 and a resin-coated pipe joint 3 are polished in this way and these parts are leveled down nearly flat; stains are removed simultaneously. The paint is then introduced by the swirling compressed air therein. The seamless and continuous resin coated film 7 is formed to the part from the steel pipe 1 to the joint 3 in this way. This coated film is pulled and spread along the inside wall surface of the pipe and is pressed to the inside wall surface by the centrifugal force exerted thereto, by which the film is uniformly formed.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention provides new piping for water or gas piping, etc. in J3, that is, a predetermined piping system using a plurality of straight pipe sections and pipe joints, and Concerning a method for finishing the inside of newly installed piping.

[Prior Art 1] In general, in this type of newly installed piping, 11 pipes are not internally finished. Conventionally used water pipes are made of galvanized steel pipes, and after several years of use, rust gradually develops on the inner surface of the pipes and the connections, causing the water to be disposed of in the market, especially in water pipes. The problem is that the chlorine used for this purpose causes significant rust to form, which causes the inside of the pipe to become clogged, resulting in a significant reduction in the water discharge r1i.

Therefore, as shown in Fig. 4, as a measure to prevent rust from forming inside the water pipe, a lining steel pipe 1 is used in the straight pipe section, and a vinyl pipe 2 is glued inside.
Also, for pipe fittings 3 such as sockets, elbows, and cheeses,
Resin-coated pipe joints in which a coating film 4 is formed by dipping or spraying vinyl chloride or epoxy resin paint inside and heat-treating the interior have come to be used.

Even if these lined steel pipes and resin-coated pipe joints are used, when connecting these pipes, threaded portions 5 and 6 are carved into the connecting portions of their ends, and the mating parts h ( , : They are screwed together and the prescribed piping is done.

(Problem to be Solved by the Invention 1) However, even if piping is established by screwing together the threaded portions 5 and 6, the threaded portion and the end portion 1a of the lining steel pipe are exposed at the connection portion J3. However, even with lined steel pipes and resin-coated pipe fittings, rust is likely to occur at the connection parts, including exposed threads and ends, and blisters can also form on the Q membrane 4 part of resin-coated pipe fittings. However, there is still a problem that the inside of the pipe becomes clogged.

In addition, when carving the threaded part, oil is used and an anticorrosive agent made of an organic solvent is applied to the joint part, so it takes a certain period of time (approximately 1 to 3 months) after the start of water service. ) These oils or anticorrosives are mixed with water and flowed out, and the presence of chili, etc. causes problems in that not only does the water taste bad, but it also leaves behind an odor.

(Means for Solving the Problems) As a specific means for solving the problems of the conventional example, the present invention provides a new pipe in which a straight pipe section and a pipe joint are piped with silica sand along with a swirling air flow. The dirt inside the pipe is removed by blowing lυ, and at the same time, the exposed metal parts or sharp parts are scraped, and then a resin paint with a viscosity of 1α that does not become atomized is supplied with the swirling air flow, and the swirling air flow This invention provides a finishing method for newly installed piping, characterized in that a resin coating film is formed by blowing out the inner surface of the piping, and the resin coating film is continuously formed on a straight pipe section and a pipe joint section, By carrying out the polishing process and the painting process, rust and blisters are prevented from forming, especially at the connection parts, and the clogging of the pipes is eliminated, so there is no need for long-term repairs.

(Example 1 The present invention will now be explained in more detail with reference to the illustrated embodiments.

In order to facilitate understanding, parts that are the same as those of the general newly installed piping described above will be described with nl- symbols attached thereto. In Figure 1, 10 is the floor of a building such as Mansicon, and 11
is a wall. For example, a new water pipe is installed inside these floors and walls, and the water pipe is composed of a plurality of lined steel pipes 1 and a plurality of resin-coated pipe joints 3 such as elbows or cheeses. , the end of this pipe is the planned end for meter installation, and the ends B and C are the planned ends to which, for example, the snake 1] will be connected.

The present invention deals with the process of installing meters, faucets, etc. at each end of such newly installed piping. The finishing treatment consists of a polishing process for the inside of the newly installed pipe and a painting process.

In the rtn +i step of the finishing method according to the present invention, the compressor 12 and the silica sand storage container No. 13 are connected to the end C farthest from the end of A, and the end B located in the middle is closed. Leave the △ end open and complete the tree-12
Silica sand is introduced into the pipe together with compressed air. In this case, the compressed air is supplied at a flow rate of about 20 m/sec or more, depending on the diameter of the pipe to be treated, while turning once. Further, the silica sand used has a hardness of 6.0 or more and a grain size coarser than 30 mesh.

[- If the degree of leakage is less than 6.0,
If the rill polishing of the threaded part or the end of the pipe is not sufficient, or
If it is more honey than 0 mesh, sufficient cleaning will not be possible.

Next, end C is closed, end A is opened, compressor 12 and silica sand storage container 13 are connected to end B, and silica sand is introduced by swirling compressed air in the same manner as described above to fill the inside with 1 tl) N
i do By cleaning in this way, the inside of the pipe has been cleaned from one direction, and then the end ff1lG is closed, the end B is opened, and the Combretree-12 and silica sand storage container 13 are connected to the end A. , and silica sand is introduced by swirling compressed air in the same manner as described above to ωti the inside. Finally, the end B is closed, the end C is opened, and the same cleaning is performed from the end Δ, so that the interior of the pipe is reciprocated.

By reciprocating the grinding in this way, as shown in FIG. The edges and edges are ground, and the corners of those parts are removed or become almost flat, and inside the pipe (-J
Blue stains are also removed at the same time. After the cleaning process is finished, the inside of the pipe is cleaned, and then the painting process is performed.

In this painting process, as in the ωl cutting process, the edge Nt
Start from the side farthest from A. That is, the end 13 is closed and the end A
is released, a compressor and a paint storage container are connected to end C, and paint is introduced by swirling compressed air to perform painting. In this case, the length of the piping from the end C to the branching point of the end B is determined in advance by measurement or the like, and a paint corresponding to that length is supplied and painted. and the end B
A pressure S1 is installed in advance in the pipe, and when the paint introduced from end C reaches the branch point at end B and slightly exceeds it, the pressure inside the branch pipe changes, which causes the paint to reach the branch point. You can know.

Next, end C is closed, end A is left open, a compressor and a paint storage container are connected to end B, and paint is introduced by swirling compressed air to perform painting. In this case, determine the length of the piping from end B to end A by first measuring the length, supply a suitable amount of paint according to its quality, and paint in the same manner as above. .

For C and 77fA, it is sufficient to visually confirm the arrival of the paint.

The paint used in the city painting process is a relatively high viscosity paint based on epoxy resin, and is supplied by swirling airflow from the planned end of the newly installed pipe. In this case, the flow velocity of the swirling air flow is approximately 30 m/sec or more, and the length of the piping to be coated is known in advance, and a suitable amount of paint is supplied all at once. As the flow swirls around the inner surface of the tube, it stretches and forms a coating film.

With this kind of supply, as shown in FIG. 3, a continuous resin coating film 7 with no joints can be formed from the lining steel pipe 1 to the resin-coated pipe fitting 3, and this formed coating The film is layered along the inner wall surface of the pipe by the swirling airflow and is pressed against the inner wall surface by applying centrifugal force, forming a resin coating 7 of a predetermined thickness, and is uniformly coated throughout. It is formed.

The viscosity of the paint used is relatively high to the extent that it does not become atomized by the introduced swirling air flow, and the viscosity of the paint used is approximately 3,000 to 35,000 cp. If the viscosity is less than 3000 cp, not only will the introduced air flow cause the coating to become atomized, but the coating film itself will be thin and have low adhesion strength, making it impossible to obtain a coating film with the intended strength. If it exceeds 3,500,000, the viscosity is so high that it cannot be uniformly stretched by the planned air flow, and a coating film of uniform thickness cannot be formed. The preferred viscosity range is approximately 4,000 to 2,000 CF).

In such a painting process, if necessary, paint may be sequentially supplied from different ends, that is, end A, and reciprocating painting may be performed in the same way as in the 11th station process. By doing this, it is possible to completely apply the paint and form a uniform coating film with a predetermined thickness.

Although the lining steel pipe has been described in Example 11, the invention is not limited to this, and examples include galvanized steel pipes for water supply (SGPW) and carbon steel pipes for piping (SGPW).
P) (usually referred to as gas pipe)
This is included in the technical idea of the present invention, which achieves the following effects and finishes newly installed piping.

(Effect of the invention 1 As explained above, the finishing method for newly installed piping according to the present invention provides J5
Silica sand is blown into the inside of the piping along with the swirling airflow to remove dirt inside the pipe, and at the same time, exposed metal parts or sharp parts are ground, and then, along with the swirling airflow, a resin paint with a viscosity that does not become atomized is supplied. Then, the inner surface of the pipe is blown out by the swirling air flow to form a resin coating, and the tree 1!
The llf coating film is formed so that -C is formed continuously on straight pipes and pipe joints, and by cleaning and painting newly installed pipes, it can be applied to the metal parts exposed inside the pipes, especially the metal parts exposed inside the pipes.
Scrape off any protruding parts such as connections or screw threads that are prone to rust and frister.
Since the stiffness, vinyl pipe, and coating are coated with width C, rust and blisters do not occur when using the pipe, and it can be used for long IJs, which is an excellent effect.

Furthermore, dirt on the inner surface of the pipes and organic solvents or oils used for connecting 1 and 2 are removed, and then covered with a series of resin coatings + 1'J, eliminating the odor and odor of tap water that is unique to newly installed pipes. It also has a soaking effect that can eliminate bad taste.

[Brief explanation of the drawing]

Fig. 1 is a schematic piping diagram that does not show an example of a newly installed piping in which the finishing method of the present invention is applied, and Fig. 2 is an example of a connection section where the (σ) local process of the present invention is applied to the newly installed piping. Figure 3 is a cross-sectional view showing an example of a connection part that has been subjected to a painting process following the Moeki cleaning process, and Figure 4 is a cross-sectional view that does not show an untreated connection part of a newly installed pipe. 1... Lining steel pipe 2... Nealed pipe 3... Resin coated pipe fitting 4...
Brush-coated coating 5.6...Threaded portion 7...Series of resin coatings Patent applicant: Nikki Setsui Kogyo Co., Ltd. Figure 1 Figure 4

Claims (4)

[Claims] (1) In newly constructed pipes connected by straight pipe sections and pipe joints, silica sand is blown into the pipes along with swirling air flow to remove dirt inside the pipes, and at the same time, exposed metal parts or sharp parts are ground, and then A resin paint having a viscosity that does not become atomized is supplied along with the swirling air flow, and the inner surface of the pipe is blown out by the swirling air flow to form a resin coating film, and the resin coating film is applied to the straight pipe portion and the pipe joint portion. A finishing method for newly installed piping, characterized in that it is formed continuously. (2) The silica sand has a Mohs hardness of 6.0 or more and a grain size coarser than 30 mesh (
1) Finishing method for newly installed piping as described. (3) The swirling air flow that introduces silica sand has a flow velocity of approximately 30
The method for finishing newly installed piping according to claim 1, wherein the finishing speed is at least m/sec. (4) The method for finishing newly installed piping according to claim 1, wherein the resin paint has a viscosity in the range of about 3,000 to 35,000 cp.