JPH0519792U - Protective cover for gas pipe - Google Patents

Abstract

(57) [Summary] [Purpose] A gas that can sufficiently exhibit a cushioning effect even when a general-purpose resin is used, has improved impact resistance, and does not damage the gas pipe due to impact or earth pressure during machine excavation. The purpose is to provide a protective cover for pipes. [Structure] A synthetic resin cylindrical cover having a substantially corrugated shape in the circumferential direction with a partially cut-away cross section, and a protective cover 9 is attached to and detached from a gas pipe 1 between both cutout edges of a cover body 2. A protective cover for a gas pipe, characterized in that it is formed with an opening 4.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a protective cover for a gas pipe.

[0002]

[Prior Art]

 Conventionally, a device described in Japanese Utility Model Publication No. 2-28315 is known as a cover for protecting a gas pipe.

The invention of this conventional example is "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 from each other on the inner peripheral surface of the cover body. Are provided over the length of the cover body, the height of each rib is approximately equal to the thickness of the cover body, and the ears have a circular cross section along the length of the cover body. The protective cover for the gas pipe is characterized in that an opening is formed between the parts to attach and detach the protective cover to the gas pipe. "

[0004]

[Problems to be solved by the device]

 By the way, in the conventional example, the shape is circular, and the ribs are small to the extent that the height dimension of the ribs provided along the longitudinal direction of the cover body is approximately equal to the plate thickness dimension of the cover body. There was only a slight cushioning effect from the external pressure on the cover.

Further, the resin is limited to the impact resistant resin in order to improve the impact resistance, but the impact resistant resin has a problem of high cost. If the surface of the protective cover made of synthetic resin has small scratches, not only the impact resistance is lowered, but also the buffering action against the impact force is lowered. As a solution to this problem, two-layer molding in which the outer surface is a soft layer and the inner surface is a hard layer is conceivable, but in this case as well, it is unavoidable that surface scratches propagate to the inner surface.

In view of the above points, the present invention can sufficiently exhibit the cushioning effect even when a general-purpose resin is used, the impact resistance is improved, and the gas pipe is damaged due to impact and earth pressure during excavation of a machine. The purpose is to provide a protective cover for a gas pipe that does not occur.

It is another object of the present invention to provide a protective cover for a gas pipe that can be overlapped in two or more layers and that can effectively prevent damage to the gas pipe due to impact and earth pressure when excavating a machine. To do.

[0008]

[Means for Solving the Problems]

 The present invention is a synthetic resin cylindrical cover having a substantially corrugated shape in the circumferential direction with a partially cutaway cross section, and an opening between the cutout edges of the cover body for attaching and detaching the protective cover to the gas pipe. It is characterized by being made.

[0009]

[Action]

 Since it is made of flexible synthetic resin and has a corrugated cross-sectional shape in the circumferential direction, it is easy to widen the notch and easily cover the gas pipe, and due to the elastic effect of the corrugated shape, it is buffered against external shocks. Have an effect. In addition, since the cross section is corrugated, it is easy to stack the protective cover more than twice. In the case of double or more as described above, the inner protective cover can be normally maintained even if small stones are rubbed against each other during construction and the outer protective cover is scratched. As a result, even if the protective effect of the outer protective cover is reduced, the inner protective cover retains the function of cushioning against external impact.

When the protective covers of the same size are piled up in a double layer, the protective cover overlaid on the outer side slightly shifts from the corrugation of the inner protective cover, so that there is an elastic gap between the two inner and outer protective cover layers. Are formed, and the impact resistance is further improved. In addition, when overlapping two layers, the same effect can be obtained even if the outer protective cover is one size larger.

[0011]

【Example】

 A protective cover for a gas pipe according to the present invention will be described with reference to the following embodiments of the drawings. FIG. 1 is a perspective view showing an embodiment of a protective cover for a gas pipe of the present invention, and FIGS. 2 to 3 are sectional views showing a state in which the protective cover is put on the gas pipe.

The protective cover 9 is made of a flexible synthetic resin, and is manufactured by extruding a raw material resin. As a flexible synthetic resin, general-purpose resins such as vinyl chloride, polyethylene, and polypropylene are advantageous in terms of cost. However, vinyl chloride resin includes NBR (acrylonitrile-butadiene rubber) and ABS resin (acrylonitrile- It may be an impact-resistant resin containing an impact-improving agent such as butadiene-styrene copolymer) or a resin called engineering resin such as polycarbonate.

The cover body 2 has a substantially corrugated tubular shape with a cross section partially cut away and has a thickness of 0.6 mm. Reference numeral 1 denotes a polyethylene gas pipe (hereinafter referred to as a gas pipe), which has an outer diameter of 42 (nominal diameter 30) mm in this example.

The design of the cover body 2 is appropriately changed according to the size of the gas pipe 1. However, the circumferential length of the valley portion of the corrugation 3 is such that when the valley portion is in contact with the outer diameter of the gas pipe 1, the opening 4 is opened. It is desirable that the width B be set to about the same as or slightly longer than the circumference of the gas pipe 1 so that the width B becomes almost zero.

The corrugations 3 formed on the cover body 2 are not particularly specified, but a regular continuous shape is preferable so that the design of the mold is easy. For example, in the example of FIG. 1, the waveform 3 has a height of 2.5 mm and a pitch of 5 mm.

Further, even if a gas or the like should leak, a large gap is formed between the protective cover 9 and the gas pipe 1, so that the gas or the like can easily flow and the gas leak or the like can be easily detected. Next, the procedure for attaching and detaching the protective cover 9 will be described.

FIG. 2 is a sectional view showing a state before the gas pipe is covered with the protective cover, and FIG. 3 is a sectional view showing a state of being buried in the ground. One end of the protective cover 9 is spread over the piped gas pipe 1, and the protective cover 9 is pressed into the gas pipe. When one end is covered, it can be covered by simply pushing in one by one. FIG. 4 is an explanatory diagram when a one-size larger protective cover is used. When doubled, the waveforms are overlapped continuously at the overlapping portion. When two protective covers of the same size are stacked, the outer cover and the inner cover are slightly shifted in corrugation.

Next, when the earth and sand 8 is covered, the opening 4 is somewhat narrowed by the earth pressure P due to the earth and sand 8, and the valley portion of the corrugation 3 comes into contact with the gas pipe 1 to hold the protective cover 9. The protective covers 9 may be sequentially stacked as shown in FIG. 5, or may be stacked alternately with the outer side and the inner side as shown in FIG. When removing the protective cover 9 from the gas pipe 1, the opening 4 is expanded and removed.

The protective cover 9 can be used as a single body, or can be used by stacking two or more layers as shown in FIG. At this time, the cover body 2 and the cover body 6 are overlapped with the opening 4 at the same position.

Further, even when they are used in a double or more stack, they can be stacked one after another as shown in FIG. 5 or alternately as shown in FIG.

[0021]

[Effect of the device]

 Since it is made of flexible synthetic resin and the cross-sectional shape is corrugated, the cushioning effect due to the shape effect can be fully exerted, and impact resistance can be improved even without using impact resistant resin. it can. This will prevent damage to the gas pipe due to impact and earth pressure during mechanical excavation.

Further, since the cross section is corrugated, the protective covers can be easily overlapped in two or more layers, and even if small stones are rubbed against each other during construction and the outer protective cover is scratched, the inner cover can be damaged. Since the protective cover is kept normal, the desired impact resistance is maintained, which effectively prevents damage to the gas pipe due to impact and earth pressure when excavating the machine.

When the protective covers of the same size are overlapped and stacked, the protective cover covered on the outside slightly shifts from the corrugation of the inner protective cover, so that the elasticity of the protective cover between the inner and outer two layers is increased. Some voids are formed, and the impact resistance is further improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a protective cover of the present invention.

FIG. 2 is a cross-sectional view showing a state before the protective cover is placed on the gas pipe.

FIG. 3 is a cross-sectional view showing a state in which a protective cover is covered with a gas pipe and embedded in the ground.

FIG. 4 is a cross-sectional view showing an embodiment in which the protective cover of the present invention is doubled.

FIG. 5 is a cross-sectional view showing a state in which protective covers are sequentially overlapped and covered.

FIG. 6 is a cross-sectional view showing a state in which a protection cover is alternately covered on the outside and the inside.

[Explanation of symbols]

 1 polyethylene gas pipe 2, 6 cover body 3 corrugated 4 opening 8 earth and sand 9 protective cover B opening width

Claims (1)

[Scope of utility model registration request] 1. A cylindrical cover made of synthetic resin having a substantially corrugated shape in the circumferential direction, which is partially cut away in its cross section, and a protective cover is attached to and detached from a gas pipe between both cutout edges of the cover body. A protective cover for a gas pipe, which is characterized by having an opening.