JPH087197Y2 - Protective cover for gas pipe - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective cover for a gas pipe.

[0002]

2. Description of the Related Art Conventionally, as a cover for protecting a pipe,
The invention described in JP-B-48-12570 (hereinafter referred to as the first conventional example) and the invention described in JP-B-52-1580 (hereinafter referred to as the second conventional example) are known.

The first prior art invention is characterized in that "a flexible material such as a synthetic resin is formed into a pipe shape, slits are provided in the longitudinal direction, and irregularities are provided on the inner surface. According to the second conventional example, the pipe protection cover is opened. "A part of the cylindrical heat transfer body 1 is opened, and the projection 3 is formed on the inner surface.
An antifreezing body in which the slide tube 5 is fixed to both ends of the slide plate 5 by covering the pipe 2 with the attached pipe 2, covering the heat insulating material 4 and covering the exterior 6. It is.

However, in the first conventional example, the unevenness of the inner surface is formed only in the portion facing the slit,
The height of these irregularities is also small. Therefore, there are many parts where the pipe and the cover are in close contact with each other, and there is a problem that the cover does not serve to buffer the pipe from external pressure. Further, even if a gas leak occurs, there is no gap between the pipe and the cover, so that the gas does not easily come out of the cover. For this reason, it was not possible to accurately determine the location of the gas leak.

On the other hand, the second prior art device relates to the antifreezing body for the water pipe, and its purpose is completely different from that of the present invention. Moreover, the height dimension of the projection formed on the inner surface of the cylindrical heat transfer member is small, and an air layer is formed between the tube and the heat transfer member, but a sufficient gap cannot be formed. Therefore, the heat transfer body does not serve the purpose and function as a cushioning protection material for the tube, and the description of the present invention does not suggest these.

Therefore, the applicant has previously provided a gas pipe protection cover that solves the problems of the conventional device (see Japanese Utility Model Publication No. 2-28315).

This gas pipe protective cover is a cylindrical cover made of impact-resistant resin, the cross-section of which is partially cut out, and the inner peripheral surface of the cover body has a size substantially equal to the plate thickness of the cover body. A plurality of ribs having a height are formed along the longitudinal direction of the cover body, and both cutout edges of the cover body are formed as ears having a circular cross section along the longitudinal direction of the cover body. The space is an opening that is attached to and detached from the gas pipe.

The protective cover thus constructed exerts a sufficient cushioning action because a large gap is created between the protective cover and the gas pipe. Also, due to this large gap,
Even if a gas leak occurs, the gas flows in this gap, so that the location of the gas leak can be easily known. Furthermore, since it covers most of the outer peripheral surface of the gas pipe,
The gas pipe can be protected from damage even if the construction machine or the construction tool receives an impact from below during excavation work or the like. Therefore, it is particularly suitable for protecting polyethylene gas pipes.

[0009]

However, in the above-mentioned protective cover, particularly when the gas pipe to be protected is made of polyethylene, there is a problem that the wall of the gas pipe may be damaged at the time of attachment / detachment. There was a problem in terms of safety.

That is, when covering the gas pipe with the protective cover, in practice, rather than by forcing the opening between the two ears of the cover body toward the gas pipe to cover it.
Put one end of both ears on the gas pipe, hit that part from above to cover one end of the cover body on the gas pipe, and then cover the remaining part so that it fits in the gas pipe. The method is adopted. However, when the gas pipe is covered with the protective cover by such a method, the opening width between both ears of the cover body is generally narrower than the outer diameter of the gas pipe and wider than 1/2 of the outer diameter of the gas pipe. In addition, the presence of the ears increases the strength of the notch edge, and the diameter of the cover tends to be narrowed due to the diameter reduction action of the material.Therefore, when one end of the cover body is tapped into the gas pipe, The sharp corners of both ears at the one end scrapes the pipe wall of the gas pipe, and the pipe wall is damaged.

The present invention has been made in view of the above problems, and a protective cover for a gas pipe which does not damage the wall of the gas pipe even if the latter method is adopted when covering the gas pipe. It is the one we are trying to provide.

[0012]

DISCLOSURE OF THE INVENTION A protective cover for a gas pipe of the present invention is a substantially circular impact-resistant resin cylindrical cover with a cutaway cross-section, and the inner peripheral surface of the cover body is spaced from each other. A plurality of ribs are provided along the longitudinal direction of the cover body, and the notched edges of the cover body are formed as ears having a circular cross section along the longitudinal direction of the cover body, and protect between these ears. An opening for attaching and detaching the cover to the gas pipe is formed, and each corner portion of both ears at at least one end of the cover main body is cut off, and by this cutting, the gas pipe receiving member gradually expanded outward at least at one end of the opening. The entrance is formed ,
Press this gas pipe inlet against the gas pipe to cover it.
-Expand the opening of the main body to cover the gas pipe.
It was the one.

[0013]

A plurality of ribs having a height substantially equal to the plate thickness of the cover body are formed on the inner peripheral surface of the cover body along the longitudinal direction of the cover body. In addition, the cover body has a cylindrical shape with a partially cutaway cross section, and both edges of the cutout are formed as ears having a circular cross section along the longitudinal direction of the cover body, and the gap between these ears is attached to and detached from the gas pipe. The opening is made. Therefore, when the gas pipe is covered with such a protective cover, a large gap is formed between the gas pipe and the gas pipe, and the cushioning effect can be sufficiently exerted. Further, due to the large gap, even if a gas leak occurs, the gas flows in the gap, and the site can be easily known.

Further, since most of the outer peripheral surface of the gas pipe is covered by the protective cover, the gas pipe may be damaged even if the machine receives a shock from the bottom during work such as digging up. Not that.

In addition, since the corners of both ears at at least one end of the cover body are cut off, thereby forming a gas pipe inlet that gradually expands outward at at least one end of the opening , this gas Press the pipe inlet into the gas pipe
In this way, open the cover body and cover the gas pipe.
Even if it is covered, the wall of the gas pipe will not be scratched.

Therefore, the present invention is particularly suitable as a protective cover for a polyethylene gas pipe.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing a protective cover according to the present invention, FIG. 2 is a side view of the same, FIG. 3 is a partially enlarged sectional view showing one of the ribs, and FIGS. 4 and 5 show the protective cover as a gas pipe. FIG. 6 is a perspective view showing a covering procedure, FIG. 6 is a sectional view showing a state in which the gas pipe is covered with the protective cover, FIG. 7 is a sectional view showing a state in the soil, and FIGS. 8 and 9 show a plurality of protective covers, respectively. It is sectional drawing which shows the state which covered the gas pipe one by one.

The gas pipe 1 shown in this example is made of polyethylene and has an outer diameter of 42 (nominal diameter 30) mm.

The protective cover 2 is made of impact resistant resin and is manufactured by extruding a raw material resin. The impact-resistant resin may be any resin generally used for molding impact-resistant resin pipes. For example, vinyl chloride resin, acrylonitrile-butadiene rubber (NB
R), acrylonitrile-butadiene-styrene copolymer (ABS resin), styrene-butadiene rubber (SB
R), acrylic acid and methacrylic acid polymers, chlorinated polyolefins, ethylene copolymers, and other resins that improve impact resistance are preferably blended.

The cover body 3 is formed in a substantially circular tubular shape with a cross section partially cut away. The outer diameter of the cover body 3 is
Although the design is appropriately changed depending on the thickness of the gas pipe 1, in this example, the outer diameter is about 65 mm, the length is about 1 m, and a gap 4 of about 10 mm is formed between the gas pipe 1 and the gas pipe 1. . In addition, the circumference thereof is substantially the same as the outer circumference of a joint (not shown) connecting the gas pipe 1.

Reference numeral 5 denotes an opening formed in a part of a circular cross section, and an opening width 6 of the opening 5 is narrower than the outer diameter of the gas pipe 1 and wider than 1/2 of the outer diameter of the gas pipe 1. If you do
The gas pipe 1 can be easily attached and detached, and the outer periphery of the gas pipe 1 can be sufficiently protected.

Reference numeral 8 denotes a plurality of ribs formed on the inner peripheral surface 9 of the cover body 3 at intervals from each other along the longitudinal direction. By providing the ribs 8 in this manner, the shaft 8 The rigidity in the direction becomes high and the bending strength becomes high. Moreover, even if the gas leaks for some reason, the leaked gas easily flows in the longitudinal direction inside the protective cover 2, and the gas leak can be easily detected. It should be noted that holes may be formed in the peripheral surface of the cover body 3, and in this case, gas leakage can be detected also in the hole portions. The height of the rib 8 is approximately equal to the thickness of the cover body 3 and is about 0.5 mm to 3 mm.
Therefore, the width is preferably larger than the height. Further, as shown in FIG. 3, when the rib 8 has rounded corners, there is no risk of damaging the tube wall of the gas tube 1 at the time of attachment / detachment, which is convenient.

Reference numeral 10 indicates an ear portion having a circular cross section (diameter is about twice the thickness of the cover body 3) provided along the longitudinal direction at the opening edge of the cover body 3. By providing the ears 10 on the opening edge portion in this manner, it is possible to prevent the edge portion from being damaged due to the increased strength of the edge portion. A gap 4 is also formed between the opening and the gas pipe 1 by the ear 10.

Further, in the protective cover 2, the corner portions of both ears 10, 10 at both ends thereof are cut off 11, 11, 11,
11, thereby forming gas pipe inlets 12, 12 that are gradually expanded outward at both ends of the opening 5. Therefore, when the protective cover 2 is attached to or detached from the gas pipe 1, particularly when the method of tapping one end of the protective cover 2 into the gas pipe 1 first is adopted, the gas pipe 1 passes through the gas pipe receiving port 12 of the protective cover 2. Therefore, the wall of the gas pipe 1 is not scratched. The size of the gas pipe receiving port 12 is appropriately determined according to various conditions such as the size of the cover body 3, the material strength, and the width dimension of the opening 5. Also, the gas pipe inlet 12
The shape (form of the excision portion 11) does not need to be linear, and may be a curved shape that bulges outward. In this example, the gas pipe inlets 12 are provided at both ends of the protective cover 2, but the invention is not limited to this and may be provided only at one end of the protective cover 2. In that case, as a matter of course, the attachment / detachment to / from the gas pipe 1 must be performed from one end where the gas pipe inlet 12 is present.

Next, the procedure for attaching and detaching the protective cover 2 will be described.

The protective cover 2 is forcibly pushed in by directing the opening 5 toward the piped gas pipe 1 and the joint, or as shown in FIG.
As shown in FIG. 1, one end of both ears 10, 10, that is, one gas pipe receiving port 12 is applied to the gas pipe 1, and that portion is tapped from above to connect one end of the cover body 3 to the gas pipe 1.
After covering (see Fig. 5) the rest of the gas pipe 1
I will cover it as if I were going with it. After that, when the soil 13 is covered, the opening 5 is somewhat narrowed by the external pressure 7 by the soil 13 (see FIG. 6).

Here, when using a plurality of protective covers 2, as shown in FIG. 7, they may be sequentially stacked on top of each other.
As shown in, the outer side and the inner side may be alternately stacked.

When removing the protective cover 2 from the gas pipe 1,
The opening 5 is expanded and separated.

[0030]

The protective cover for a gas pipe of the present invention is made of impact resistant resin, and a plurality of ribs are formed on the inner peripheral surface of the cover body along the longitudinal direction of the cover body. Also,
An opening is formed by cutting out a part of the cover body having a substantially circular cross section, and both edges of the cutout are ears having a circular cross section along the longitudinal direction of the cover body.

Therefore, when the gas pipe is covered with such a protective cover, a large gap is created between the gas pipe and the gas pipe, and the cushioning effect can be sufficiently exerted.

Further, even if a gas leak occurs due to the large gap, the gas flows in the gap, and the site can be easily known.

Furthermore, since most of the outer peripheral surface of the gas pipe is covered by the protective cover, there is no danger of damaging the gas pipe even if the machine receives an impact from below during the work such as excavation. Absent.

Moreover, since the gas pipe receiving port is formed at at least one end of the opening , this gas pipe receiving port is used as the gas pipe receiving port.
Spread the opening of the cover body by pressing
Even if the gas pipe is covered, the wall of the gas pipe is not damaged.

Because of this, even if the gas pipe is made of polyethylene, it can be buried in the soil with confidence.

[Brief description of drawings]

FIG. 1 is a perspective view showing a protective cover according to the present invention.

FIG. 2 is a side view showing a protective cover according to the present invention.

FIG. 3 is a partially enlarged sectional view showing one of the ribs.

FIG. 4 is a perspective view showing a procedure of covering a gas pipe with a protective cover.

FIG. 5 is a perspective view showing a procedure of covering a gas pipe with a protective cover.

FIG. 6 is a cross-sectional view showing a state in which a gas pipe is covered with a protective cover.

FIG. 7 is a cross-sectional view showing a state in soil.

FIG. 8 is a cross-sectional view showing a state in which a plurality of protective covers are sequentially covered on a gas pipe.

FIG. 9 is a cross-sectional view showing a state in which a plurality of protective covers are sequentially covered on a gas pipe.

[Explanation of symbols]

 1 Polyethylene Gas Pipe 2 Protective Cover 3 Cover Body 4 Gap 5 Opening 8 Rib 10 Ear 11 Resection 12 Gas Pipe Inlet

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Junichi Kuratani, 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi, Osaka (56) Bibliography 60-154694 (JP, U) Actual Kai 63-99097 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A cylindrical cover made of impact-resistant resin having a substantially circular cross section with a part cut away, and a plurality of ribs spaced apart from each other on the inner peripheral surface of the cover body in the longitudinal direction of the cover body. The cutout edges of the cover body are formed along the longitudinal direction of the cover body, and the ears have a circular cross section along the longitudinal direction of the cover body. Each corner of both ears at least at one end of the main body is cut off, and by this cutting, a gas pipe inlet gradually expanded outward is formed at at least one end of the opening, and the gas pipe inlet is connected to the gas pipe. Press it
Expand the opening of the cover body to cover the gas pipe
A protective cover for a gas pipe characterized by being made .