JPH09112741A - Marking sheet for member buried in ground - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a sheet from being cracked from its end so as to be prevented from being cut when the sheet is caught by a power shovel and the like, by reinforcing the folded back parts of both edges of a sheet main body by being stuck or sewn together. SOLUTION: Folded back parts 2, 2a are formed by folding both edges of a sheet main body 1 by little width. These folded parts 2, 2a are sewn together by sewing threads 3, 3a so as to reinforce both edges, and also folding parts 4 in which a part of the sheet main body 1 is overlapped are formed. Spot welding 5 is applied to the folding parts 4 so that they may not be separated from each other. Both edges of the sheet main body 1 are thusly reinforced, therefore, tensile strength and tearing strength of both edges are improved, and there is no fear that the sheet main body 1 is easily ruptured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sign sheet which is buried together above a buried gas pipe, a water pipe, a cable, or other objects so that the existence of such objects can be recognized.

[0002]

2. Description of the Related Art When gas pipes, water pipes, cables, etc. are buried in the ground, the power shovel etc. damages these buried objects when excavating the ground later by road construction, sewer construction, etc. In order to prevent this, a so-called marker sheet is embedded together about 40 to 50 cm above the embedded object. This sign sheet is an elongated body having a constant width obtained by laminating a woven cloth or the like to a laminated sheet usually made of synthetic resin, and this sheet has "gas conduit", "water pipe", "With cable"
In addition to being printed with a caution note saying, folds are formed at intervals in the length direction of the sheet so that if a power shovel etc. gets caught on the sheet, the sheet will stretch and not cut immediately. However, spot welding and the like are easily performed so that the folds cannot be unraveled (JP-A-60-
No. 215184, JP-A No. 61-59084,
JP-A-1-164882).

Further, as a marker sheet which is stretched by making zigzag cuts in the sheet instead of forming folds, a sheet disclosed in Japanese Utility Model Laid-Open No. 57-70285 is known. Further, a sheet obtained by laminating a reinforcing sheet on a sheet for the purpose of reinforcing the sheet is disclosed in Japanese Utility Model Laid-Open No. 63-132378.

[0004]

However, the above-mentioned conventional marking sheet has the following drawbacks. a. Since the sheet is made of a homogeneous material,
When a power shovel or the like is caught on a sheet, a crack may be easily generated from the edge of the sheet and the sheet may be cut. b. In the case of a folded sheet, if the spot-welded portion is located at the end, the sheet strength is significantly reduced due to the notch effect. c. In order to increase the strength of the sheet, the cost is increased because the sheet is made thick and expensive materials are used.

[0005]

The object of the present invention is to propose a marker sheet which does not have the drawbacks described in the above a to c, and its constitution is as follows. 1. A marker sheet for an underground buried object, characterized in that both edges of the sheet body are folded back, and the folded back portions are bonded or sewn together to reinforce. 2. A marker sheet for an underground buried object, characterized in that a U-shaped reinforcing sheet is adhered or sewn to be reinforced so as to sandwich both edges of the sheet body. 3. A marking sheet for an underground buried object, which is formed by adhering or stitching a reinforcing sheet along one side of both edges of the sheet body.

[0006] 4. A marking sheet for an underground buried object, which is formed by adhering or stitching a reinforcing sheet along both sides of the sheet body. 5. A marker sheet for buried objects, wherein reinforcing warp threads are inserted into the sheet body in the longitudinal direction and the density of the warp threads is densely formed on both edge sides of the sheet body. 6. A marker sheet for an underground buried object, wherein reinforcing warp threads are inserted into the sheet body along the longitudinal direction and the strength of the warp threads is set to be high on both edges of the sheet body. 7. A marker sheet for underground buried objects, in which reinforcing threads are sewn along both edges of the sheet body.

[0007]

[Function] Since both edges of the seat body are reinforced, even if a power shovel or the like is caught, it will not be cut from the end.

[0008]

1 is a plan view of a sheet according to the present invention, and FIG. 2 is a sectional view taken along the line AA '. In this sheet, both edges of a sheet body 1 are folded back with a small width to form folded portions 2, 2a. The folded-back portions 2 and 2a are sewn together with the sewing threads 3 and 3a to reinforce both edges, and as shown in FIG. 3, the folded-in portions 4 are formed so that the folded-in portions 4 cannot be unraveled. In addition, the spot welding 5 is performed easily.

The sheet body 1 has a polyethylene cloth 6 and a polyethylene film 7 as shown in FIG.
And the adhesive resin 9 with the marking print sheet 8 interposed therebetween.
It is a cross-sectional structure that is pasted together. The usage of the above-mentioned sheet is the same as that of the conventional example.
It is buried along the gas conduit at a distance of 50 cm.

FIG. 5 shows another embodiment of the reinforcing structure, in which the reinforcing tape 10 is sewn or adhered with the sewing threads 3 and 3a along one side of both edges of the seat body 1, and FIG. 6 is a sheet reinforcing tape. 11 is formed in a U shape and is sewn or bonded with sewing threads 3 and 3a so as to sandwich both edges of the seat body 1. In FIG. 7, a reinforcing thread 12 is inserted into the seat body 1 and the reinforcing thread 12 is inserted. 8 is a structure in which the middle portion is coarsely inserted and the portions closer to both edges are tightly inserted to increase the strength on both edge sides. In FIG. The structure in which the high-strength thread (thick thread) 14 is inserted in the portion close to both edges is shown in FIG.
This is an example of reinforcement in which No. 5 is sewn in.

[0011]

The present invention has the following effects by reinforcing both edges of the seat body as described above. a. Even if a power shovel or the like is caught, the tensile strength and the tear strength of both edges are high, so there is no fear of breaking easily. b. In the case of conventional sheets, expensive materials were used in order to increase tensile and tear strength, but inexpensive materials were used because both edges of the sheet body were reinforced and fear of breakage was eliminated. Can make a sheet.

[Brief description of the drawings]

FIG. 1 is a plan view of a marker sheet according to the present invention.

FIG. 2 is an enlarged sectional view taken along line AA ′.

FIG. 3 is an explanatory view of a marker sheet in which a fold is formed.

FIG. 4 is an explanatory view showing a laminated structure of a seat body.

FIG. 5 is an explanatory view of an example in which a reinforcing tape is attached along both edges of the seat body.

FIG. 6 is an explanatory view of an example in which U-shaped reinforcing tapes are attached along both edges of the seat body.

FIG. 7 is an explanatory view of an example in which a reinforcing thread is coarsely and densely inserted in the seat body.

FIG. 8 is an explanatory view of an example in which strong reinforcing threads are inserted on both edges of the seat body.

FIG. 9 is an explanatory view of an example in which reinforcing threads and the like are sewn on both edges of the seat body.

[Explanation of symbols]

 1 sheet body 2, 2a folded part 3, 3a sewing thread 4 folding 5 spot welding 6 polyethylene cloth 7 polyethylene film 8 marking printing sheet 9 adhesive resin 10 reinforcing tape 11 sheet reinforcing tape 12 reinforcing thread 13 thread of relatively low strength ( Thin thread) 14 High strength thread (thick thread) 15 Reinforcing thread

Claims (7)

[Claims] 1. A marker sheet for an underground buried object, characterized in that both edges of a sheet main body are folded back, and the folded-back portions are bonded or sewn together for reinforcement. 2. The sheet U is sandwiched by both edges of the body.
A marker sheet for an underground buried object, which is formed by adhering or stitching a character-shaped reinforcing sheet. 3. A marker sheet for an underground buried object, which comprises a reinforcing sheet adhered or sewn along one side of both edges of the sheet body. 4. A marker sheet for an underground buried object, comprising a reinforcing sheet adhered or sewn along both sides of a sheet body. 5. A marker sheet for an underground buried object, wherein reinforcing warp yarns are inserted into the sheet main body in the longitudinal direction and the density of the warp yarns is densely formed on both edge sides of the sheet main body. 6. A marker sheet for underground buried objects, wherein reinforcing warp yarns are inserted into the seat body along the longitudinal direction and the strength of the warp yarns is set to be high on both edge sides of the seat body. 7. A marker sheet for an underground buried object, comprising reinforcing threads sewn along both edges of the sheet body.