JP3139664B2 - Piping protective material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective material for pipes having improved direct impact resistance and shearing impact resistance in order to protect pipes buried underground from being hit by a drilling tool or the like. It is about.

[0002]

2. Description of the Related Art For example, pipes of gas or the like buried underground may be damaged by a drilling tool or the like in a road construction or other excavation work during construction. Since the gas pipe is made of polyethylene or vinyl chloride, in order to prevent the above-described accidents, a sign sheet is disposed in the vicinity of the buried pipe (not shown) in the related art. In order to prevent the damage caused by the excavating tool or the like, the operator finds out that the pipe is buried under the excavating work by finding the sign sheet or hooking the excavating tool or the like. However, from the viewpoint of reducing the burial work, the burial position of the gas pipe is not set too deep, and there is a risk that the drilling tool may accidentally hit the gas pipe during work and damage the gas pipe. There is a polyethylene just above the gas pipe,
There has been proposed a proposal in which a gas pipe is protected by providing a pipe protective material in which a single woven fabric such as polypropylene is laminated. For example, a knitted fabric 1 as shown in FIG.
As shown in FIG. 10, the pipe protective material 3 is formed by laminating a plurality of pieces, as shown in FIG. As shown in FIG. 11, the cross section of the polyethylene tape 2 is usually 8 mm in the width direction.
The tape has a width of 30 mm and a thickness D of 30 mm.

[0003]

SUMMARY OF THE INVENTION
In the above, even if the polyethylene tape 3 is used, there is no problem in strength when the excavating tool hits directly, but for example, an impact is applied such that the tool hits obliquely from above and slides laterally. In this case, since the cross section of the polyethylene tape is also flat, there is a possibility that some scratches may occur, and further shear resistance is required. Furthermore, in the case of a woven fabric using the tape 4 having a three-layer structure, the number of steps increases accordingly, and it is difficult to reduce the manufacturing cost. The present invention has been proposed in order to improve the above-described problems, and an object of the present invention is to provide a piping protection material having improved direct impact resistance and shearing resistance.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a protective material for protecting a pipe from being hit by a tool or the like, comprising a plurality of cloth members made of polypropylene tape. It is characterized in that it is formed by lamination. Further, the present invention is a protective material for protecting a pipe from being hit by a tool or the like, and includes a polyethylene single tape and
And a plurality of cloth members formed by alternately weaving single polypropylene and polypropylene tapes .
Further, the present invention is a protective material for protecting a pipe from being hit by a tool or the like, and a cloth member formed of a polyethylene single tape and a cloth member formed of a polypropylene single tape are appropriately used. It is characterized in that it is laminated by combining the number of sheets. Further, the present invention is a protective material for protecting a pipe from being hit by a tool or the like, and a synthetic resin tape is formed by changing a ratio of a tape width to a wall thickness, and the tape is woven. It is characterized in that a plurality of formed woven fabrics are laminated. In addition, polyethylene can be applied to the synthetic resin. Also, the present invention
A protective material for protecting a pipe from being hit by a tool or the like, characterized in that at least two synthetic resin tapes are overlapped and a plurality of woven fabrics formed by weaving are laminated. And the present invention is a protective material for protecting a pipe from being hit by a tool or the like, and at least two different synthetic resin tapes are overlapped,
It is characterized in that a plurality of woven fabrics formed by weaving are laminated.

[0005]

[Function] Polypropylene itself is more excellent in shear resistance than polyethylene alone, so that it can be made to have no problem strength and buried piping can be sufficiently protected from the impact of drilling tools. it can. Further, when a structure in which cloth members using only a polypropylene tape are laminated is used, the structure is simpler than a cloth member formed by using polyethylene in combination, and the number of manufacturing steps can be reduced. Further, when a fabric member is formed by combining polyethylene having excellent direct impact resistance and polypropylene having excellent shear impact resistance, the fabric member has excellent direct impact resistance and shear impact resistance. In addition, even if the cloth member made of polyethylene and the cloth member made of polypropylene are appropriately combined in number, a protective material excellent in not only direct impact resistance but also shear impact resistance can be obtained. Further, when the thickness of the yarn (tape) constituting the knitted fabric is increased, the impact resistance per knitted fabric is improved. In any case, since the impact resistance of the fabric member itself is improved, the number of laminated fabric members can be reduced, and the manufacturing cost can be reduced.

[0006]

Next, various examples of the pipe protective material according to the present invention will be described in detail. FIG. 1 shows a piping protection member 10, which is formed by laminating knitted fabrics 11 a, 11 b, 11 c, and 11 d formed by weaving a polypropylene tape (described later).

As shown in FIG. 2, the knitted fabrics 11a to 11d are formed by weaving polypropylene tapes 12 in the vertical and horizontal directions. In addition, the said woven fabric 11a-
The edge of 11d can be heat sealed to prevent fraying. Further, the knitted fabrics 11a to 11d
1. 1. sewing machine, etc. Ultrasonic, 3. High frequency; Adhesive, 5. They can be laminated and bonded to each other by heat welding.

[0008] According to the pipe protective material 10 as described above,
The material itself is more shear resistant than polyethylene alone,
It is excellent in impact resistance, can obtain satisfactory strength, and can sufficiently protect the buried pipe from the impact of a drilling tool or the like. Further, since the piping protective material 10 has a structure in which the woven fabrics 11a to 11d made of the polypropylene-only tape 12 are laminated, the protective material for the woven fabric is made of a tape having a structure using a different synthetic resin (polyethylene) together with the polypropylene. As compared with the method described above, the number of steps is small, the structure is simple, and the strength of the knitted fabric is increased, so that the number of laminated layers can be reduced.

Here, an impact test will be described using a pipe protective material 10 using a woven fabric made of a polypropylene-only tape and a protective material using a woven fabric made of a polyethylene tape. Test 1 Piping to be protected ... Inner diameter: 50 mm, wall thickness (t): 6
mm Protective material: 2000 denier, wall thickness: 30 μm
Polyethylene woven cloth (three layers) using a tape of 2,000 denier, polypropylene woven cloth (three layers) using a tape having a thickness of 30 μm Test method: direct hit, shear, excavation Test method Material PE PP Direct impact 8.8 12.0 Shear 8.1 0.9 Excavation 8.0 3.7 However, the number shall indicate the flaw depth (%). Result: The test method significantly improved in any of direct hit, shear and excavation. This is particularly noticeable in a shear test. Test 2 Piping to be protected: Inner diameter: 50 mm, wall thickness (t): 6
mm Protective material: 2000 denier, wall thickness: 30 μm
Polyethylene woven cloth (4 layers) using a tape of 2,000 denier, polypropylene woven cloth (4 layers) using a tape of 30 μm thickness Test method: direct impact, shear, excavation Test method Material PE PP Direct hit 4.0 5.9 Shear 4.7 0.5 Excavation 4.1 1.6 Result ... The strength is further improved compared to the case of three layers, and a remarkable effect is seen in the shear test. In any case, the pipe protection member 10 configured as in the above-described embodiment was sufficiently resistant to the impact of the excavation tool.

Next, FIG. 3 illustrates a pipe protecting material according to a second embodiment of the present invention. in this case,
The knitted fabric 20 is made of a tape 21 of polyethylene alone (hereinafter, referred to as a tape 21).
A polyethylene tape 21) and a polypropylene single tape 22 (polypropylene tape 22) are alternately woven. A plurality of, for example, three or four layers of the knitted fabric 20 having such a configuration are stacked to constitute a protective material for piping.

According to such a woven fabric 20, polyethylene is excellent in direct impact resistance and polypropylene is excellent in shear impact resistance. Therefore, the woven fabric 20 is formed by combining such polyethylene and polypropylene. Thus, a problem-free strength having both shear resistance and direct impact resistance can be obtained, and the buried pipe can be sufficiently protected from the impact of a drilling tool or the like even in an actual excavation test. Further, compared to a woven fabric formed by a single tape having a three-layer structure made of polyethylene and polypropylene, the number of steps is small and the structure is simple, and the strength of the woven fabric 20 is increased. Therefore, the manufacturing cost can be reduced.

The pipe protecting material according to the present invention may be configured as shown in FIG. In the pipe protection member 30 in the third embodiment, a polyethylene woven fabric 31 made of a single polyethylene tape and a polypropylene woven fabric 32 made of a single polypropylene tape are appropriately combined and laminated. In the piping protection member 30 shown in the figure, a polyethylene woven fabric 31 and a polypropylene woven fabric 32 are respectively stacked two by two. The polyethylene woven fabric 31 and the polypropylene woven fabric 32 are formed by weaving a tape (not shown) of polypropylene and polyethylene alone in the vertical and horizontal directions, respectively.

According to the pipe protection member 30 described above, the polyethylene woven fabric 31 and the polypropylene woven fabric 32
And a suitable number of layers are laminated, so that it is possible to obtain a problem-free strength having both shear resistance and direct impact resistance, and to sufficiently protect the buried piping from the impact of a drilling tool or the like. . In addition, by combining a woven fabric using polyethylene and polypropylene,
Since the strength of the knitted fabric is increased, the number of laminated members can be reduced as compared with a protective material formed of a knitted fabric of polyethylene alone, and the manufacturing cost can be reduced.

Here, a piping protection member 30 formed by combining a polyethylene woven fabric 31 made of a polyethylene single tape and a polypropylene woven fabric 32 made of a polypropylene single tape and a protection material which is a laminate of only the polyethylene woven fabric 31 are used. The following are the impact tests performed. Test 1 Piping to be protected ... Inner diameter: 50 mm, wall thickness (t): 6
mm Protective material: 2000 denier, wall thickness: 30 μm
Polyethylene woven cloth (three layers) using a tape of 2,000 denier and one layer of a polypropylene woven cloth 32 using a tape having a thickness of 30 μm and a polyethylene woven cloth 3
Test method for direct knitting, shearing, and excavation of composite knitted fabric with 1 layer consisting of 2 layers: PE, 3 layers, composite direct hitting 8.8 5.2 Shearing 8.1 3.5 Excavation 8.0 1.3 The numbers indicate the flaw depth (%). Result: The test method significantly improved in any of direct hit, shear and excavation. This is particularly noticeable in excavation tests. Test 2 Piping to be protected: Inner diameter: 50 mm, wall thickness (t): 6
mm Protective material: 2000 denier, wall thickness: 30 μm
Polyethylene woven cloth (4 layers) using 2,000-denier, 30-μm-thick tape and one layer of polypropylene woven cloth 32 and polyethylene woven cloth 3
Test method for composite knitted fabric with 1 layer of 3 layers: direct hit, shear, excavation Test method Material PE layer composite direct hit 5.9 3.7 shear 4.7 0.7 excavation 4.1 4.0 result ... ... The strength is further improved as compared with the case of three layers, and there is a remarkable effect in a shear test. Sufficient strength can be obtained even with three layers, and three layers are appropriate from the viewpoint of cost. In any case, the pipe protection member 30 configured as in the above embodiment was sufficiently resistant to the impact of the drilling tool.

FIG. 5 shows a piping protection material according to the present invention.
The configuration shown in FIG. In the woven fabric 40 according to the fourth embodiment, a polyethylene tape 4 is used.
1 is woven horizontally and vertically. As shown in FIG. 6, the polyethylene tape 41 has a cross-sectional shape in which the width dimension W is smaller and the wall thickness, that is, the thickness dimension D is larger than that of the conventional yarn, and is woven. Thus, the thickness of the knitted fabric 40 is larger than that of the conventional knitted fabric made of yarn.

According to the protective material in which such a woven fabric 40 is laminated, the impact resistance is remarkably improved and the problem-free strength is improved as compared with the conventional woven fabric protective material using a flat-shaped woven yarn. Therefore, the buried pipe can be sufficiently protected from the impact of a drilling tool or the like even in an actual drilling test.
In addition, since the number of laminations can be reduced by increasing the strength of the knitted fabric, manufacturing costs can be reduced. In addition, since polyethylene was adopted as the material,
It can be diverted from polyethylene pipes, and material costs can be reduced.

Next, a protective material made of a woven fabric 40 using a thick polyethylene tape 41 and a protective material made of a conventional woven fabric using a flat polyethylene tape were used.
List the impact test. Test 1 Piping to be protected ... Inner diameter: 50 mm, wall thickness (t): 6
mm Protective material… 2000 denier thickness 30μm polyethylene tape woven fabric (three layers) 2000 denier thickness 70μm polyethylene tape woven fabric (three layers) Test method… direct impact, shearing, Excavation test method Tape thickness 30 μm 70 μm Direct hit 8.8 6.9 Shear 8.1 2.3 Excavation 8.0 5.0 However, the numbers shall indicate the flaw depth (%). Result: The test method significantly improved in any of direct hit, shear and excavation. This is particularly noticeable in a shear test. Test 2 Piping to be protected: Inner diameter: 50 mm, wall thickness (t): 6
mm Protective material ... 2000 denier thickness 30μm polyethylene woven fabric (4 layers) 2000 denier thickness 70μm polyethylene tape woven fabric (4 layers) Test method ... Excavation test method Tape thickness 30 μm 70 μm Direct hit 5.9 3.9 Shear 4.7 0.7 Excavation 4.1 3.3 Result ..... Strength is more improved than in the case of three layers, and is remarkable in the shear test. Has a significant effect. In any case, the knitted woven fabric 40 configured as in the above embodiment was sufficiently resistant to the impact of the excavation tool.

Further, the piping protection material according to the present invention may be configured as shown in FIG. In the knitted fabric 50 according to the fifth embodiment, a laminated tape 5 in which a polyethylene tape and a polypropylene tape are overlapped with each other is used.
1 is woven horizontally and vertically. The laminated tape 5
1 is a polypropylene tape 51P as shown in FIG.
And a tape 51E made of polyethylene, which is superposed, and the weaving is performed so that the thickness of the woven fabric 50 is larger than that of the conventional woven fabric using the tape. Also, by stacking two stretched 1000 denier tapes without changing the amount of material,
The thickness of the 000 denier tape can be increased.

According to the protective material obtained by laminating such a woven fabric 50, the impact resistance can be remarkably improved and a problem-free strength can be obtained as compared with the conventional protective material using a woven fabric. Also, the buried pipe can be sufficiently protected from the impact of a drilling tool or the like even in an actual excavation test. In addition, since the number of laminations can be reduced by increasing the strength of the knitted fabric, manufacturing costs can be reduced. further,
The tapes may be stacked such that thin tapes are stacked so that a tape having a desired thickness is obtained, or different synthetic resins or the same type of synthetic resin tape may be stacked.

[0020]

As described above, according to the protective material for piping of the present invention, the resistance of the cloth member constituting the protective material for piping to shearing resistance and direct impact resistance is improved, so that a problem-free strength can be obtained. Buried pipes can be sufficiently protected from the impact of a drilling tool or the like. In addition, since the strength of the cloth member is improved, the number of laminated members can be reduced, so that manufacturing costs can be suppressed.

[0021]

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional explanatory view showing one embodiment of a pipe protective material according to the present invention.

FIG. 2 is a schematic plan view of a knitted fabric constituting the pipe protective material shown in FIG. 1;

FIG. 3 is a schematic plan view of a knitted fabric showing a second embodiment of the pipe protection material according to the present invention.

FIG. 4 is a schematic cross-sectional explanatory view showing a third embodiment of the pipe protecting material according to the present invention.

FIG. 5 is a schematic plan view of a knitted fabric showing a fourth embodiment of a pipe protective material according to the present invention.

6 is a schematic sectional explanatory view of a polyethylene tape applied to the knitted fabric shown in FIG.

FIG. 7 is a schematic plan view of a woven fabric showing a fifth embodiment of a pipe protective material according to the present invention.

FIG. 8 is a schematic sectional explanatory view showing a configuration of a synthetic resin tape applied to the knitted fabric shown in FIG. 7;

FIG. 9 is a schematic plan view showing an example of a knitted fabric constituting a conventional pipe protective material.

FIG. 10 is a schematic cross-sectional explanatory view of a piping protection member formed of the knitted fabric shown in FIG. 9;

FIG. 11 is a schematic explanatory view showing a cross-sectional shape of a synthetic resin tape applied to a woven fabric.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takuya Maeda 2-2-20 Shiotaki, Ichikawa-shi, Chiba Prefecture 3-212 Gyoku Heim 3-212 (72) Inventor Yuji Haga 4-1 Nihonbashi Kobunacho, Chuo-ku, Tokyo Heisei Inside Polymer Co., Ltd. (72) Inventor Toru Ogawa 4-1 Nihonbashi Kobunacho, Chuo-ku, Tokyo Heisei Polymer Co., Ltd. (56) References JP-A-63-302027 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16L 57/00 B29C 63/02 B32B 5/26 B32B 27/02

Claims (7)

(57) [Claims] 1. A protective material for protecting a pipe from being hit by a tool or the like, wherein the protective material is formed by laminating a plurality of cloth members made of a polypropylene tape. 2. A protective material for protecting a pipe from being hit by a tool or the like, comprising a polyethylene single tape and a polyethylene tape.
A protective material for piping, comprising a plurality of cloth members formed by weaving propylene pyrene tapes alternately . 3. A protective member for protecting a pipe from being hit by a tool or the like, wherein a cloth member composed of a polyethylene single tape and a cloth member composed of a polypropylene single tape are appropriately provided. A protective material for piping characterized by being combined and laminated. 4. A protective material for protecting a pipe from being hit by a tool or the like, wherein a synthetic resin tape is formed by changing a ratio of a tape width to a wall thickness, and formed by weaving the tape. A protective material for piping, comprising a plurality of laminated woven fabrics. 5. The piping protective material according to claim 4, wherein said synthetic resin is polyethylene. 6. A protective material for protecting a pipe from being hit by a tool or the like, wherein at least two synthetic resin tapes are overlapped and a plurality of woven fabrics formed by weaving are laminated. Protective material for piping. 7. A protective material for protecting a pipe from being hit by a tool or the like, wherein the protective material is formed by laminating at least two different synthetic resin tapes and laminating a plurality of woven fabrics. Characteristic protective material for piping.