JPS58193116A - Anti-corrosive coating method and anti-corrosive covering member - Google Patents

Abstract

PURPOSE:To perform anti-corrosive operation in a good workability by coating a part branched by a pipe joint to a gas-main and a water-main and its neighborhood with a covering member of special shape and attaching them with a restricting means. CONSTITUTION:A branch saddle 2 is installed on the main pipe 1, a pipe joint 4 is connected to the connecting hole 3 provided on the saddle and branched, the branch part that connects a fitting pipe 6 to the other connecting end part 5 of the pipe joint 4 and the neighborhood are coated with an anti-corrosive covering member 7. In this case, a fitting hole 21 is provided on the flexible seat 16, the covering member 23 connected with a cylinder 14 is provided to the fitting hole, the fitting pipe 6 is interted into the cylinder 14 of the covering member 23, then the fitting pipe 6 is connected to the pipe joint 4 that has been fitted previously to the main pipe 1. Then, the seat 7 is stretched along the main pipe 1, the whole outer circumference of the main pipe 1 is stuck by restricting means 18a, 18b, 19a, 19b to the seat and the cylinder body 14 is stuck by the restricting means 20a, 20b around the fitting pipe 6.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an anti-corrosion coating method and an anti-corrosion coating for preventing corrosion on the outer surface of, for example, a metal pipe for transporting fluids such as gas or tap water buried underground. Regarding.

In the prior art, in order to prevent corrosion of a duck pipe for gas or water pipes buried underground, the outer tube was covered over the entire length of the f pipe with a sleeve made of flexible synthetic resin. This prevents underground muddy water from flowing along the outer circumferential surface of the tube, thereby suppressing the progress of corrosion. In addition, when connecting a new attachment pipe to the existing metal main pipe covered with the sleeve and dividing the fluid flowing through the pipe, a shaft is first excavated at the location where the branch is to be made.

Next, the sleeve covering the main pipe is removed at the position where the main pipe is to be branched, and the attached pipe is connected via a pipe joint. A rectangular sheet made of synthetic resin is wrapped around the outer periphery of the base pipe, pipe joint, and attachment pipe, and the wrapped sheet is bound by binding means such as adhesive tape or string. In such prior art, the sheet body is wrapped around the base pipe and the pipe joint as much as possible by means of binding means.

Although water was prevented from entering the space between the mounting pipe and the sheet body, muddy water from underground entered through the gaps in the sheet body, and as a result, the corrosion prevention effect could not be said to be sufficient. Furthermore, it was extremely difficult to wrap the sheet body around the surfaces of the main pipe, pipe joint, and attached pipe in the narrow shaft.

An object of the present invention is to solve such technical problems and provide an anticorrosive coating method H and an anticorrosive coating that have excellent workability and an excellent anticorrosion effect.

Figure @1 is a simplified perspective view showing the completed width of an embodiment of the present invention. For example, a metal branch saddle 2 is attached to a metal main pipe 1 for branching. The connecting hole 3 formed in the branch side A/2 is connected to the main pipe l,
For example, one connection end of a metal pipe joint 4 is connected to this connection hole 8 . A metal attachment pipe 6, for example, is connected to the other connecting end 5 formed on the pipe joint 4. These main pipe l1 branch saddle 2. The pipe fitting 4 and the attachment pipe 6 are covered with an anti-corrosion coating 7. The anti-corrosion covering 7 is a band-shaped body 1 welded to the anti-corrosion Wl covering 7.
8 to 20, base pipe amount 1 branch side IL/2, pipe fitting 4
and is bound to and in close contact with the outer surface of the attachment tube 6.

FIG. 2 is a cross-sectional view taken along the section line ``---'' shown in FIG. The sheet body 16 of the anti-corrosion covering 7 is the branch saddle 2
It is wrapped around the outer circumferential surface of the This sheet body 1
Both ends 16a and J6b of J6 overlap. This so na υ
As will be described later, the portion 24 is not formed in the vicinity of the lower part of the main pipe 1 indicated by the arrow 25 (lower part in FIG. .

Figure 3 is a sectional view for explaining and relating to the process of an embodiment of the present invention. A shaft 9 is excavated near the location where the main pipe l buried underground 8 is to branch.

A sleeve 10 may be previously provided on the outer periphery of this main pipe over the entire length of this main pipe 1 for corrosion protection. After excavation of the shaft, the sleeve 10 is partially removed.

FIG. 4 is a perspective view for explaining the steps of an embodiment of the present invention. The zero source tube IK has one branch side S/2 fixed.

This branch Sado JL/2 is a pair of half-barrel members 11.12
It consists of These members 11, 12 are arranged at opposite positions on the outer circumferential surface of the connecting part and are fastened to the original WIK by means of fasteners such as bolts, nuts, etc. This allows the main pipe IK to be connected to the pre-drilled branch hole and the branch side A/
The two connecting holes 8 are connected to each other.

Figure 5 is a perspective view for explaining the process of an embodiment of the present invention.

Pipe fitting 4 is screwed in. This connects the main pipe 1 and the pipe joint 4. The pipe joint 4 is formed with a connecting end 6 to be connected to an attachment pipe 6.

Fig. 6 Fi is a perspective view showing an anticorrosive coating 7 according to an embodiment of the present invention. The material for this anti-corrosion coating 7 is, for example, EV obtained by copolymerizing ethylene and vinyl acetate.
AIi fat is used. This EVA resin Vi exhibits excellent properties such as flexibility, environmental crack resistance, and processability.
This anti-corrosion coating 7 is.

The sheet body 6, the cylinder 14, and the belt-like body t8a*18b as a binding means; 19a, 19b; 20a.

20b. A mounting hole 21 is provided in the sheet body 16VCu, and the center 21a of this mounting hole 21 has a side length l.
The width W of the other side in the direction perpendicular to this one side is 1116
It is located at a distance of wl from a and a distance of W2 from the other end 16b. Here, this distance Wl is chosen to be larger than the distance W2. Also, the width W (= w 1 + w 2) of the y −) body 16 is
The length is sufficient to enclose the main pipe 1 to be covered and the branch saddle 2f so that their ends overlap. The base end 14 of this spray hole 21
From b, the cylindrical body 14Vi is formed in a cylindrical shape, and is oriented in a direction perpendicular to the plane formed by the sheet body 16 (above in FIG. 6). 1
The axis Fi of this cylinder 14 is deviated from one end 16a of this sheet body 16 by a distance Wl as described above.As a result, as shown in Fig. 2, One end 16a and the other end 16b of the sheet body 16, which are parallel to the tube axis direction, overlap when the sheet body 16 is wound around the single tube! and the branch side v'l. and were selected appropriately, the cylinder body 14
The belt-shaped body 18 is not formed near the position 25 (lower part of Fig. 2) on the axial extension line of the sheet body 16.
a, 18b; one end of 19a, 19b is welded, respectively. These strips tea, tsb; t9a, 19b are arranged in the width direction of the sheet body 16 (from the upper left to the lower right in Figure $6) K
It extends and has a shape bv longer than the width W of the sheet body 16. One ends of strips 20a and 20b are welded to the outer periphery of the cylinder 14, respectively. The strips 20a and 20b extend in a direction in which they abut against the outer periphery of the cylinder 14.
It is formed longer than the outer circumference of. Further, the end portion 16aK is formed parallel to one side l of the sheet body 16 such that an adhesive layer 16c coated with an adhesive extends along the side l. This adhesive layer 16c is applied to the surface (
It is formed on the back side of the paper in Figure 6).

Also, in the area 22 shown by hatching the sheet body 14 near the cylindrical body 14 of the anticorrosive coating 7 in Figure @6.

The piping identification, construction date, and manager's name are displayed by printing. Piping identification includes the type of fluid flowing through the pipe, such as water or gas.

Also, in the example of real power mentioned above! Although the band members 18-2o are welded to the anti-corrosion coating 7, adhesive tape or string may be used instead of the band members 18-20. However, in another embodiment of the present invention, the band members 58 to 20 are not provided.

A band-shaped body made of a flexible material may be prepared separately from the anti-corrosion covering 7, and the anti-corrosion covering 7 may be bound by this band-shaped body.

FIG. 7 is a perspective view for explaining the steps of an embodiment of the present invention. The cylindrical body 14 of the anti-corrosion coating 7 is.

The free end 14a of this cylindrical body 14 is inserted into the inside of the tube axis of the mounting tube 6, that is, in the direction shown by the arrow 15. The end 6a of this attachment pipe 6 is screwed into the connection end 5 of the pipe joint 4.

FIG. 8 is a perspective view for explaining the process ' of one embodiment of the present invention. One side of the anticorrosive coating 7 (the side extending in the left-right H direction in FIG. 8) is ground along the tube axis direction indicated by the imaginary line 17. The other side of the sheet body 16 in the H direction perpendicular to the negative side (
(A side extending in the vertical direction in the figure) Wrap along the outer peripheral surface of the T-branch side A/2 and the main pipe 1. In addition, anti-corrosion coating 7
A free end 14a of the cylindrical body 14 extends inward along the tube axis of the attachment tube 6. The sheet body 16 is bonded at both ends 16a, 16b of the sheet body 16 by the adhesive layer 16C formed at the ends of the sheet body 16. It is tightened along the outer peripheral surface of 1. The free ends of the strips 1418a, 18b are fixed to each other. Similarly, the sheet body 16 is tightly attached to the main pipe 1 by the band-like bodies 19a and 19b. Cylindrical body 14
The strips 20a and 20b are tightened along the outer peripheral surface of the attachment tube 6, and the free ends of the strips 2oa and 20b are fixed to each other and tightly attached to the attachment tube 6 (see figure m1).

FIG. 9 is a perspective view of an anticorrosive coating 28 according to another embodiment of the present invention. In the above-mentioned embodiment, although the strips 18 to 20 were used as means for binding the anticorrosive coating 7, adhesives l-26 to 28 can be used instead of the strips 18 to 20. . These adhesive layers 26 and 27 are formed by applying adhesive to both ends parallel to side l on the rocky surface of the sheet body (back side a of the paper in Figure 9). Free end 14a of cylinder 14
Adhesive is applied to the inner circumferential surface of , forming adhesive @28. These adhesive layers 26 and 27 are adhered to the outer peripheral surfaces of the primary tube 1 and the branch saddle 2, as well as to the sheet body 16, respectively. The adhesive layer 28 is bonded to the outer peripheral surface of the bone retrieval tube 6. As a result, the anti-corrosion coating 28 is connected to the primary pipe l1 branch side IL/2. It is tightly attached to the outer peripheral surfaces of the pipe fitting 4 and the attachment pipe 6.

In the above-mentioned embodiment, the pipe joint 4 was used to connect the single-source IK attachment pipe 6, but in still another embodiment of the present invention, when the pipe joint is not used, the single-source pipe 1 is used. It is also possible to connect the attachment pipe 6 directly to the.

As described above, according to the present invention, since the cylindrical body is formed in advance on the anti-corrosion fitting, muddy water in the pond is prevented from penetrating into the outer circumferential surface of the pipe body, compared to the prior art described in *fm. Therefore, an excellent anti-corrosion effect can be obtained. In addition, since the axis of the cylinder formed on the anti-corrosion coating is shifted toward one end in the direction H perpendicular to the tube axis of the sheet body, it is easy to wrap the anti-corrosion coating around the outer circumferential surface of the tube. becomes. Furthermore, the anti-corrosion coating can be used regardless of the size of the pipe body and the attached pipe, as well as the orientation of the pipe with respect to the main pipe.

[Brief explanation of drawings]

Fig. 1 is a simplified perspective view showing an embodiment of the present invention in a fully-developed state, Fig. 2 is a cross-sectional view taken from the section line ll-1 shown in Fig. Step t of one embodiment Fin,
Figure 5 is a perspective view for explaining the process of Example 1 of the present invention; @4 is a perspective view for explaining the process of Example 1 of the present invention; Figure 6 is a perspective view showing an anti-corrosion coating 7 according to an embodiment of the present invention, Figure 7 is a perspective view for explaining equipment e4 according to an embodiment of the present invention, and Figure 8 is an embodiment of the present invention. FIG. 9 is a perspective view showing an anticorrosive liquid S tool 28t according to another embodiment of the present invention. l...Main pipe, 2...Branch Sado JL/, 4...Pipe joint, 6...Mounting pipe, 7.28...Corrosion prevention fitting, 1
4...Cylinder body, 16...Sheet body, 18-20...
Band-shaped body, 21... Attachment holes, 26-28... Adhesive layer agent Patent attorney Kei Nishi Part 1 Figure 2 Figure 1 Figure 3 Figure 4 Figure 5 Figure 2 Figure 6 Figure 7 Figure 8

Claims (3)

[Claims] (1) A sheet body formed in a rectangular or square shape with a mounting hole centered at the center of one side of the sheet body and at a position offset from the center of the other side perpendicular to this side, and the base of this mounting hole. A covering device made of a flexible material and having a cylindrical body extending perpendicularly along the entire outer periphery of the end is prepared. Before connecting the tube with the main tube VC6, insert the attachment tube into the cylindrical body of the sheathing with the free end of this cylindrical body facing inward of the tube axis of the attachment tube. Next, connect the mounting pipe and the main pipe. Thereafter, the above-mentioned side direction of the sheet body is extended along the tube axis direction of the main pipe, and the first and other sides of the sheet body are tightly attached to each other by means of binding means all around the outer periphery of the main pipe. A corrosion-resistant coating J5 method characterized in that the anti-corrosion coating is closely attached around the mounting pipe by means of binding means. (2) A sheet body formed in a rectangular or square shape with a mounting hole formed at the center of one side of the sheet body at a position offset from the center of the other side perpendicular to this side, and the base end of this mounting hole. 81. An anti-corrosion covering made of a flexible material having a cylindrical body extending substantially perpendicularly along the entire outer periphery of the member. (3) The cylindrical body is formed into a cylindrical shape and is attached to the sheet body in a right angle direction, so that it can be used freely corresponding to the direction of the attached pipe. Anti-corrosion coating as described in section.