JPH0313035Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) This invention relates to an anti-corrosion cover for a piping joint mainly consisting of a steel pipe with an external anti-corrosion coating and a cast iron pipe joint.

(Prior art) As shown in FIG. 5, by using a cast iron pipe joint 51 coated with anti-corrosion coating and wrapping an anti-corrosion tape 52 around the joint between the pipe joint 51 and the anti-corrosion coated steel pipe 41. Conventionally, methods of preventing corrosion of pipe joints have been implemented. In addition, piping joints that are fixed with bolts, nuts, etc. are covered with an intermediate enclosing material, then wrapped with a heat-shrinkable synthetic resin cylindrical outer packaging material, and sealed by heating from the outside. A covering method is disclosed in Japanese Patent Application Laid-Open No. 60-49191.

(Problems to be Solved by the Invention) However, in the conventional method illustrated in FIG. is attached, exposing the cast iron metal. Furthermore, the anticorrosion performance of the joints may also depend on the tape wrapping skills of the pipeworker, and corrosion may occur from these parts.

Furthermore, the method described in JP-A No. 60-49191 includes covering the joint part with an intermediate enclosing material at the piping site, enclosing it with a cylindrical outer enclosing material, and
A complicated process of heating the outer packaging material from the outside and shrinking it is required.

(Means for Solving the Problems) In view of the above-mentioned problems, this invention was made with the aim of providing a corrosion-proofing cover that can provide complete corrosion-proofing performance to pipe joints using an extremely simple method. The gist of the cover is a corrosion-resistant cover consisting of a cylindrical cover body enclosing a pipe joint and a gel-like filler layer provided on the inner peripheral surface of the cover body, the cover body comprising: , has an inner circumferential shape with a gap between it and the outer circumferential shape of the piping joint part, has a plurality of through holes penetrating inside and outside arranged in a distributed manner, and is expandable and connectable at at least one location in the axial direction; The anti-corrosion cover is characterized in that the filler layer is in a sufficient amount to fill the space between the cover body and the pipe joint.

(Example) This invention will be described below with reference to the drawings. FIG. 1 is a partially sectional front view of an example of the anti-corrosion cover of this invention, in which 1 is the anti-corrosion cover, 11 is the cover body, 12 is a filler layer, and 13 is a through hole. The cover body 11 is made of hard synthetic resin such as polyolefin resin, ABS resin, hard vinyl chloride resin, etc., and as is clear from the perspective view near the end face in FIG. It has an inner peripheral surface shape with a gap in between, is cut at two places along the axial direction, and has hook-shaped hooks 22 and 23 protruding from the cut edges 21 and 21, respectively, along the axial direction. form a shape.

Further, the cover body 11 has a plurality of through holes 13 with a diameter of 1 to 5 mm distributed throughout its entire circumference, penetrating inside and outside, and a gel-like filler layer 12 is provided on the inner peripheral surface of the cover body 11. A release paper 14 is adhered to the inner peripheral surface of the filler layer 12 to form the anti-corrosion cover 1. The density of the distributed arrangement of the through holes 13 is arbitrarily determined depending on the viscosity and amount of the gel-like filler, but it is between 10 and 13.
Preferably, the spacing is 20 mm. In addition, release paper 14
This prevents the filler from adhering to other parts before construction, and also prevents gravel and the like from adhering to the filler layer.

Gel-like fillers are made of special polymer synthetic resins mainly made of medium-molecular-weight polyisobutylene, which have excellent water resistance, moisture resistance, heat resistance, and chemical resistance, and are resistant to aging over long periods of time. It is preferably used to maintain stable properties. In addition, the amount required for the filler layer 12 is slightly larger than the volume between the pipe joint part of the smallest pipe joint and the cover body 11 among pipe joints of a size that can be protected against corrosion by the anti-corrosion cover. It is preferable.

In addition, the outer packaging material 11 is as shown in FIG.
A cylindrical piece divided into two parts in the axial direction is connected together at one end via a hinge part 31, and hook-shaped hooks 2 are attached to both end edges 21, 21 of the connected piece, respectively.
2 and 23 may have a shape protruding along the axial direction.

FIG. 4 is a partially cross-sectional front view of an embodiment of the anti-corrosion cover of this invention; 1 indicates the anti-corrosion cover;
Reference numeral 41 indicates a synthetic resin-coated steel pipe, and reference numeral 42 indicates a screw-in type cast iron pipe joint. After peeling off the release paper 14, the anti-corrosion cover 1 is wrapped around the pipe joint, and the opposing hook-shaped hooks 22 and 23 are engaged with each other to bring the filler layer 12 into close contact with the pipe joint. .

In this way, the anti-corrosion cover 1 can be attached instantly by an extremely simple operation of engaging the hooks, without requiring any measures such as heat shrinkage.

In this way, the anti-corrosion cover 1 is placed over the threaded cast iron pipe joint 42 and the coating layers 43, 43 of the synthetic resin coated steel pipes 41, 41. On this occasion,
The air and excess filler between the pipe joint and the cover body 11 flow out through the through hole 13 and between the covering layers 43, 43 and the cover body 11, and the air and excess filler flow out from the hole 44 between the pipe joint and the cover body 11.
is completely filled with filler.

Further, if a plurality of through holes 13 are distributed around the entire circumference of the cover body, excess filler material flows out from the entire circumference of the cover through the through holes 13 on average regardless of the size of the pipe joint. Therefore, the anti-corrosion cover 1 can be easily wrapped around the pipe joint without the filler material gathering in the engaging part and the gap 44.

In this way, the exposed bare metal of the pipe joint is covered with a filler that is water and moisture resistant and also blocks air, etc., so the pipe joint completely eliminates the causes of corrosion from the outside. In addition, leakage of the fluid flowing inside can be prevented.

As in the embodiment shown in FIG. 4, if the inner peripheral surfaces of the synthetic resin-coated steel pipes 41, 41 and the cast iron pipe joint 42 are not anti-corrosion treated, they will be corroded from the inside by the fluid flowing inside the pipes. However, this problem can be solved by applying anti-corrosion treatment to the inner circumferential surface. The anti-corrosion cover of this invention can be applied to piping used for all kinds of purposes such as water supply, hot water supply, gas supply, etc.

Further, the anti-corrosion cover of this invention can be applied not only to a screw-in type joint as shown in FIG. 4, but also to all types of joints such as housing type joints, Victory type joints, and flange joints.

(Function) By tightly covering the outer circumferential surface of the pipe joint with the anti-corrosion cover 1, excess filler and air between the pipe joint and the anti-corrosion cover are removed between 44
The filling material flows out even more, and the space between the pipe joint and the cover body 11 is completely filled with the filler, regardless of the size of the pipe joint.

(Effect of the invention) The anti-corrosion cover of this invention is constructed as described above,
Because the space between the pipe joint and the cover body is completely filled with the filler material regardless of the size of the pipe joint, it is possible to completely eliminate external sources of corrosion protection for the pipe joint. At the same time, leakage of the fluid flowing inside can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional front view of an example of the anti-corrosion cover of this invention, Fig. 2 is a perspective view of the end face portion of the anti-corrosion cover of Fig. 1, and Fig. 3 is another example of the anti-corrosion cover of this invention. FIG. 4 is a front view partially sectionally showing an embodiment of the anti-corrosion cover of this invention, and FIG. 5 is a front view showing the anti-corrosion structure of a pipe joint by a conventional method. 1... Corrosion protection cover, 11... Cover body, 12
... filler layer, 13 ... through hole, 14 ... release paper,
22, 23... Hanging tool, 31... Hinge part, 41
...Synthetic resin coated steel pipe, 42...Screw-in cast iron pipe joint, 52...Anti-corrosion tape, 53...Scratch.

Claims (1)

[Claims for Utility Model Registration] 1. An anti-corrosion cover consisting of a cylindrical cover body enclosing a piping joint and a gel-like filler layer provided on the inner circumferential surface of the cover body, wherein the cover body has an inner circumferential shape with a gap between it and the outer circumferential shape of the piping joint, has a plurality of through holes penetrating inside and outside arranged in a distributed manner, and can be expanded and connected at at least one location in the axial direction. The anti-corrosion cover is characterized in that the filler layer is in a sufficient amount to fill the space between the cover body and the pipe joint. 2. The anti-corrosion cover according to claim 1, wherein the cover body is a cylindrical body divided into two parts in the axial direction. 3. The anti-corrosion cover according to claim 1, wherein the cover main body is made up of two cylindrical pieces divided in the axial direction and one end of which is integrally connected via a hinge part. 4. The anti-corrosion cover according to claims 1 to 3 of the utility model registration claim, in which a release paper is adhered to the inner circumferential surface of the filler layer.