JP3288225B2 - Corrosion protection cover for fittings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anticorrosion cover for a pipe joint, and more particularly to a pipe joint anticorrosion protection used for a so-called polyethylene sleeve method for coating a synthetic resin sleeve, particularly a polyethylene sleeve, around the underground pipe. Regarding improvement of the cover.

[0002]

2. Description of the Related Art When a conventional polyethylene sleeve method is carried out, as shown in FIG. 7, a polyethylene sleeve P is put on the outer circumference of a pipe, and a receiving port A and an insertion port B are lifted up to connect the pipe. Figure tube as shown in 8 socket a side band D ₁ to indicate the inserting B-side outer periphery in Fig. 10 to cover the joint portion stretched to spigot B side polyethylene sleeve P of
Then, as shown in FIG. 9, the polyethylene sleeve P on the insertion opening B side is extended to cover the joint part twice, and the outer periphery of the receiving end A side is wound with a band D _{2 as} shown in FIG. It was tightened and tied, then backfilled and buried underground.

However, when this method is carried out, it is necessary to use a large-diameter cylindrical body capable of covering at least the outer periphery of the receiving port, so that the diameter of the polyethylene sleeve is too large in the straight pipe portion. It was necessary to tighten key points with an adhesive tape or a band E (an adhesive tape E in the illustrated example) so as not to get in the way, and there was a drawback that the time and labor required for the construction were required.

In addition, there is a drawback that groundwater may enter the sleeve due to insufficient tightening force of the band D ₁ D ₂ and insufficient fixing of the adhesive tape E or the like, and may flow along the sleeve. Further, since the outer peripheral portion of the joint portion of the polyethylene sleeve is also loose to some extent, it is likely to receive a direct hit of the backfilled earth and sand, causing a breach, and such a breach causes groundwater intrusion. There were drawbacks.

[0005] The applicant of the present invention has made it possible to use a polyethylene sleeve having a diameter which does not need to cover the outer periphery of the joint by integrally covering only the joint. In addition, a pipe joint anticorrosion cover has been proposed which can eliminate the necessity of fixing the polyethylene sleeve around the straight pipe portion to prevent looseness of the polyethylene sleeve as in the prior art (for example, Japanese Patent Application No. 7-344775).

[0006]

2. Description of the Related Art Since the pipe joint anticorrosion cover is a molded body that integrally covers the pipe joint, there is a problem if the inner surface of the molded body and the outer shape of the pipe joint substantially match. However, when used for pipe fittings smaller than the standard, as shown in FIG. 11, surplus portions are collected on the adhesive strips 3, 3 of the pipe joint anticorrosion covers 1, 1, which are split into two parts. There is a problem that a gap S is formed between the portion and the outer wall of the receiving port A or the receiving port B. In addition, upper part E or lower part F of the joint part
, A tensile force L can be applied to the adhesive pieces 3 and 3 so that a gap is hardly formed.

[0007]

SUMMARY OF THE INVENTION In view of the above problems, the present invention is simple in construction and hardly causes intrusion of groundwater.
It is an object of the present invention to provide a pipe joint anticorrosion cover which is highly reliable and can be waterproofed even if the pipe joints have slightly different standards, and which is versatile.

[0008]

That is, the pipe joint anticorrosion cover according to claim 1 is a synthetic resin which covers an outer contour of a pipe joint C which is connected by inserting the insertion opening B into the receiving opening A. Of the pipe joint part anticorrosion cover main body 1, 1 split into two in the axial direction, and radially outward from the split edge 2 of the pipe joint part anticorrosion cover main body 1 split into two. It is characterized by comprising extended adhesive pieces 3, 3 and insert pieces 4, 4 further extended to the front and rear end sides of the pipe joint portion anticorrosion cover body 1 of the adhesive pieces 3, 3. is there.

[0009] The pipe joint anticorrosion cover according to claim 2 is
The pipe joint anticorrosion cover according to claim 1, wherein the pipe joint part anticorrosion cover main body 1, 1 has a straight tubular portion 1 </ b> A inner surface along a straight pipe portion that follows a receiving port A rear and a straight line along a straight pipe portion of an insertion opening B. The pressure-sensitive adhesive layers 5, 5 are provided on the inner surface of the tubular portion 1B and the surfaces of the adhesive pieces 3, 3.

[0010]

Since the pipe joint anticorrosion cover according to claim 1 is a molded body that covers the outer contour of the joint C, the two-part molded body is covered on the joint, and the opposing adhesive pieces 3, 3 are provided. The pipe joint is completely covered by bonding. In addition, the adhesive pieces 3, 3
The outer insertion pieces 4 and 4 insert one insertion piece between the inner surface of the pipe joint anticorrosion cover 1 on the other side and the outer surface of the tube. Therefore,
Even if the gaps formed in the adhesive pieces 3 and 3 are filled with the insertion pieces 4 and 4 and the size of the pipe joint is smaller than the pipe joint anticorrosion cover, sufficient watertightness is maintained.

After covering the pipe joint in this manner, the outer surface of the polyethylene sleeve previously covered on the straight pipe portion 6 is adhered to the outer surface of the polyethylene sleeve with an adhesive tape or the like, or the polyethylene sleeve is lifted up on the straight pipe portion. The work is completed by extending the pipe and tightening it with an adhesive tape or a band on the outer surface of the anticorrosion cover of the pipe joint.

[0012] The pipe joint portion anticorrosion cover according to claim 2 is
In the above-mentioned claim 1, in addition to the opposing adhesive pieces 3 and 3, the inner surface of the straight tubular portion 1A along the straight tube portion following the receiving port A and the straight tubular portion 1B along the straight pipe portion of the insertion opening B are respectively straightened. Since the pressure-sensitive adhesive is directly adhered to the outer surface of the polyethylene sleeve covered on the pipe portion or the outer circumference of the straight pipe portion, the outer circumference of the joint portion is almost completely hermetically sealed.

[0013]

Next, an embodiment of the anticorrosion cover for a pipe joint according to the present invention will be described. FIG. 1 is a plan view of the pipe joint anticorrosion cover according to the first embodiment, and FIG. 2 is a perspective view of a main part of the pipe joint anticorrosion cover.

Example 1 A synthetic resin sheet having a thickness of 1
A molded body that covers the outer contour of the pipe joint portion C using a polyethylene sheet of mm as a molding material, the pipe joint portion anticorrosion cover main body 1, 1 and the split edge 2 that are split into two in the axial direction.
Adhesive pieces 3 and 3 extending radially outward from, and insert pieces 4 and 4 outside the adhesive pieces 3 and 3 are formed by press molding, and a pressure-sensitive adhesive made of butyl rubber is formed on the surface of the adhesive piece 3. Layer 5 was provided. The pressure-sensitive adhesive layer 5 may be provided on the surface of all the adhesive pieces 3 or may be provided only on one adhesive piece 3. Further, it may be provided on the surface of the insertion pieces 4, 4.

Next, a polyethylene sleeve method was applied to the anticorrosion cover of the pipe joint. As shown in FIG. 4, as shown in FIG. 4, first, a polyethylene sleeve P is put on the straight pipe portion of the pipe 6, and the ends are fixed watertight with waterproof adhesive tapes 7, 7. Then, as shown in FIG. Then, the pipe joint portion anticorrosion cover 1 which was split into two was put on, and the insert piece 4 was bent up to fit along the straight pipe portion of the pipe 6.

Next, the other pipe joint anticorrosion cover 1 is put on, and the pressure-sensitive adhesive layers 5, 5 of the adhesive pieces 3, 3 are pressed, and at the same time, the insert piece 4 is put on in advance as shown in FIG. And was bonded on the insert 4 of the anticorrosion cover 1 of the pipe joint. Thereafter, the straight pipe portions of the pipe joint anticorrosion covers 1 and 1 were adhered to the outer surface of the polyethylene sleeve P with an adhesive tape.

Embodiment 2 FIG. 3 is a plan view of a pipe joint anticorrosion cover according to a second aspect. Example 1 Inner surface of a straight tubular portion 1A along a straight tube portion following a receiving port A of a pipe joint portion anticorrosion cover body 1, 1 of Example 1, and a straight tubular portion 1B along a straight pipe portion of an insertion opening B.
Pressure sensitive adhesive layers 5 and 5 made of butyl rubber were provided on the inner surface. In this case, the pressure-sensitive adhesive layers 5 and 5 of the adhesive pieces 3 and 3 may be both sides or one of the adhesive pieces 3 and 3 as in the first embodiment.

Next, as a comparative example, construction was carried out in the same manner as before using a polyethylene sleeve having a diameter capable of sufficiently covering the joint, and the time required until the completion of the construction was measured. 10 used on average
When the fittings were immersed in water for 1 hour and the state of intrusion of external water was examined, the invented example showed almost no intrusion of external water, while the comparative example showed slight intrusion. But all were invading.

[0019]

As described above, according to the first aspect of the present invention, the joint portion can be coated very quickly, and the insertion piece 4, 4 is overlapped between the pipe and the pipe joint anticorrosion cover. Since the gap that can be filled is filled, it can be used even when the outer shape of the pipe joint is smaller than the size of the anticorrosion cover of the pipe joint, and a reliable polyethylene sleeve method with almost no water leakage can be implemented. Furthermore, there is no need to use a large-diameter sleeve capable of covering even the joint portion as a conventional polyethylene sleeve for covering the straight pipe portion of the pipe, so that there is an effect that the construction of the straight pipe portion is simplified.

According to the second aspect of the present invention, in addition to the same effects as those of the pipe joint portion anticorrosion cover according to the first aspect, the pipe joint portion anticorrosion cover is adhered to the straight pipe portion of the buried pipe with a pressure-sensitive adhesive. Therefore, there is an effect that the waterproofness becomes more reliable.

[Brief description of the drawings]

FIG. 1 is a plan view of a pipe joint anticorrosion cover according to the first embodiment.

FIG. 2 is an exploded perspective view of the pipe joint anticorrosion cover.

FIG. 3 is a plan view of the pipe joint anticorrosion cover according to the second embodiment.

FIG. 4 is an explanatory view showing a construction state of the pipe joint anticorrosion cover according to claim 1 or 2;

FIG. 5 is an explanatory view showing a construction state of the pipe joint anticorrosion cover.

FIG. 6 is a cross-sectional view showing a state in which the pipe joint anticorrosion cover is installed.

FIG. 7 is a cross-sectional view showing the state of implementation of a conventional polyethylene sleeve method.

FIG. 8 is a side view showing an implementation state of the polyethylene sleeve method.

FIG. 9 Shows the state of implementation of the same polyethylene sleeve method
It is a side view.

FIG. 10 is an enlarged sectional view of a main part showing the state of implementation of the polyethylene sleeve method.

FIG. 11 is a cross-sectional view of the pipe joint portion anticorrosion cover of the prior art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Corrosion prevention of pipe joint part, cover main body 1A ... Straight tubular part 1B ... Straight tubular part 2 ... Dividing edge 3 ... Adhesive piece 4 ... Insert piece 5 ... Pressure sensitive adhesive layer 6 ... Tube 7 ... Adhesive tape P ... Polyethylene sleeve A … Receptacle B… Insertion C… Fitting

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Yutaka Isu 2-26-26 Ohama-cho, Amagasaki City, Hyogo Prefecture Inside Kubota Mukogawa Works Co., Ltd. (56) References JP-A 9-159094 (JP, A) JP-A Sho 57-83788 (JP, A) JP-A 2-87196 (JP, U) JP-A 59-160993 (JP, U) JP-A 56-127496 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) F16L 57/00 F16L 58/10

Claims (2)

(57) [Claims] 1. A molded article made of synthetic resin, which covers an outer contour of a pipe joint portion C connected by inserting an insertion port B into a receiving port A, wherein the pipe joint is split into two in the axial direction. Anticorrosion cover body 1, 1 and pipe joint part anticorrosion cover body 1 split into two
Adhesive pieces 3, 3 extending radially outward from the divided edge 2 of
And an insertion piece (4, 4) extending to the front and rear ends of the joint (3, 3) of the joint (3, 3). 2. An inner surface of a straight tubular portion 1A along a straight pipe portion following a receiving port A of a pipe joint portion anticorrosion cover body 1, 1 and an inner surface of a straight tubular portion 1B along a straight pipe portion of an insertion opening B and an adhesive piece 3. The pipe joint anticorrosion cover according to claim 1, wherein pressure-sensitive adhesive layers (5, 5) are provided on three surfaces.