JP2006124870A - Protection sheet for underground pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a protection sheet for underground pipe securing sufficient strength by a single sheet and easy to produce and reducing the cost for manufacturing. <P>SOLUTION: The invention relates to the protection sheet 1 for covering peripheral of the underground pipe or upward part of the pipe through covering soil, comprising a double-folded longitudinal resin band 2 obtained by forming and drawing a synthetic resin, a single ply transversal resin band 3 obtained by forming and drawing a synthetic resin. The protection sheet is obtained by alternately weaving the longitudinal resin band 2 and the transversal resin band 3 into a band like sheet, and the sheet has enhanced strength by double folding the resin band and is set to have flexibility in transverse direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a buried pipe protective sheet that protects buried pipes such as gas pipes and water pipes buried in the ground, particularly buried pipes made of synthetic resin, etc., from being hit or impacted by a drilling tool. .

Conventionally, many protective sheets for protecting the buried pipe from the excavation tool during road construction and pipe burying work have been proposed.
For example, Patent Document 1 proposes a protective sheet configured by laminating a plurality of cloth members formed by alternately weaving a polypropylene single tape or a polypropylene single tape and a polyethylene single tape.
Japanese Patent No. 3139664

  However, each of the single tapes is made of polypropylene or polyethylene, for example, woven long fibers having a thickness of 2000 denier and formed into a strip shape having a thickness of 30 μm. These single tapes are alternately woven so as to cross each other. The body. A cloth-like body in which these single-piece tapes are woven has high flexibility but lacks strength. Therefore, it is necessary to laminate a plurality of cloth-like bodies.

Therefore, there are problems that the number of manufacturing steps increases because of the lamination of a plurality of sheets, and the manufacturing cost increases.
An object of the present invention is to solve the above-mentioned problems and to provide a buried pipe protective sheet that can secure sufficient strength by itself, can be easily manufactured, and can reduce manufacturing costs.

  The invention according to claim 1 is a buried pipe protective sheet that covers at least the upper part of the buried pipe around the buried pipe or through a covering soil, and alternately includes a vertical resin band and a horizontal resin band in which a synthetic resin is stretch-molded. Is formed into a sheet shape.

The invention according to claim 2 is such that at least one of the vertical resin band and the horizontal resin band is woven by overlapping a plurality of sheets, and a single or a plurality of layers are used.
The invention according to claim 3 is that the flexibility in the width direction is made larger in the length direction by woven a plurality of the vertical resin bands more than the horizontal resin bands.

The invention according to claim 4 is a resin band in which a plurality of resin bands are arranged for each predetermined number.
According to a fifth aspect of the present invention, the vertical resin band and the horizontal resin band are made of polypropylene, each having a thickness of 0.4 mm to 2.0 mm and a width of 9 mm to 30 mm, The back is embossed.

The invention described in claim 6 is such that a joint portion in which a longitudinal resin band and a transverse resin band are welded to each other is formed on both side edges of the sheet.
According to the seventh aspect of the present invention, a sign symbol is printed on the surface directly or via a resin film adhered to the surface.

  According to the first aspect of the present invention, an impact of a drilling tool of a drilling machine can be obtained by alternately weaving resin bands that are stretch-molded and crystallized in the length direction and have a predetermined strength (tensile strength, impact resistance). It is possible to form a protective sheet having an impact resistance that can withstand. Thereby, even if it is a single sheet | seat, an embedded pipe | tube can fully be protected, manufacture is also easy and manufacturing cost can be reduced. In addition, by using multiple sheets, the strength can be increased, and the upper protective sheet can be prevented from slipping and preventing damage when the excavation tool moves laterally after scratching and scratches. Can do.

According to the second aspect of the present invention, the strength can be increased by stacking and folding a plurality of resin bands as compared with a case where a single resin band is woven.
According to the invention described in claim 3, when the vertical resin band and the horizontal resin band are alternately woven, by orienting the vertical resin bands stacked on a plurality of sheets, the flexibility in the width direction can be improved from the vertical direction. it can. As a result, it becomes easy to bend the belt-like sheet arranged in the length direction of the buried pipe in the width direction, and the work to be wound around the buried pipe or arranged in a curved shape through the cover soil on the upper part of the buried pipe. This can be easily performed, and the strength and workability can be further improved.

According to invention of Claim 4, intensity | strength and a softness | flexibility can be selected arbitrarily.
According to the fifth aspect of the present invention, by using a resin band made of polypropylene and having a thickness of 0.4 mm or more and a width of 9 mm or more, sufficient strength against the hitting of the excavation tool can be obtained. Further, when the thickness is 2.0 mm or less and the width is 30 mm or less, desired flexibility can be obtained, and handling and manufacturability can be ensured. Further, by embossing the surface of the resin band, it is possible to prevent vertical cracking, improve the apparent thickness, improve the strength of the koji, and increase the surface frictional resistance.

According to invention of Claim 6, peeling and spreading of the side edge part of a protection sheet can be prevented by a junction part, and handleability can be improved.
According to the seventh aspect of the present invention, by directly or indirectly writing the mark symbol of the embedded object on the surface of the protective sheet, the embedded object can be easily recognized, and a separate marker sheet can be omitted.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Embodiment 1]
A first embodiment will be described with reference to FIGS.

  As shown in FIG. 1 to FIG. 6, this protective sheet 1 is formed in a strip shape having a predetermined length by alternately weaving longitudinal resin bands 2 in the length direction and transverse resin bands 3 in the width direction. 1 'is wound and accommodated.

  The vertical resin band 2 and the horizontal resin band 3 are made of polypropylene, are stretch-molded at a predetermined stretch ratio (for example, about 4 to 10 times), and are formed in a solid shape with crystal orientation in the length direction, and have sufficient strength. (Tensile strength, impact resistance).

  The resin bands 2 and 3 have a thickness of 0.5 mm, a tensile strength of 1300 N / piece when the width is 15 mm, a tensile strength of 1800 N / piece when the thickness is 1.0 mm, and a tensile strength when the thickness is 1.5 mm. The strength is 2500 N / piece or more (impossible to experiment). The tensile strength data is based on the applicant's experiment.

  As shown in FIG. 3, the resin bands 2 and 3 each have a thickness: t = 0.4 to 2.0 mm and a width: w in the range of 9 to 30 mm, and particularly preferably a thickness: t = 1. A range of 0 to 1.5 mm and a width: w = 12 to 20 mm is preferable. This is because if the thickness is 0.4 mm or less, sufficient strength cannot be secured, and if the thickness is 2.0 mm or more, flexibility is insufficient and weaving and handling becomes difficult. Further, when the width is 9 mm or less, it is difficult to obtain sufficient strength, and when it is 30 mm or more, it becomes difficult to manufacture by weaving.

  On the front and back surfaces of the resin bands 2, 3, for example, embossed patterns 4 in which parallel protrusions are crossed at a predetermined angle are formed, respectively, to prevent vertical cracking, to improve the apparent thickness, strength, and flexibility, The surface frictional resistance is increased. Of course, the embossed pattern 4 is not limited to the illustrated one.

  The belt-shaped protective sheet 1 is woven in an orthogonal cross so that the vertical resin band 2 and the horizontal resin band 3 have almost no gaps. In the first embodiment, one horizontal resin band 3 and the vertical resin band 3 are woven. Two bands 2 are woven alternately. Thereby, the impact resistance by the excavating tool can be improved while ensuring the flexibility in the width direction, and the direct winding laying method and the arc laying method described later can be easily performed by the flexibility in the width direction.

  Further, the vertical resin band 2 and the horizontal resin band 3 are joined to the left and right side edge portions thereof by, for example, welded portions (joining portions) 5 that are perforated. Instead of the welded portion 5, a joining portion may be formed by sewing with a binding thread, or a resin locking tool such as a resin clip may be attached at intervals of 20 to 40 cm, or a stop needle may be attached. The sheet staple used can also be used.

  As shown in FIG. 9, the belt-shaped protective sheet 1 may be used by directly winding it around the buried pipe P and fixing it with a strap or a binding band (not shown). As shown in FIG. In addition, it is covered with a covering soil M having a predetermined height h (for example, 10 to 30 cm), and a flat laying type in which the upper portion of the buried pipe P is formed in an arcuate shape (semicircle) It is constructed as an arc surface installation type that covers and arranges. In FIG. 7 to FIG. 8, the protective sheet 1 is used as a single sheet, but two or three sheets (a plurality of sheets) can be used in an overlapping manner. When a plurality of protective sheets 1 are used in an overlapping manner, after the excavating tool (bucket, etc.) hits, sufficient strength can be secured against the impact, and even when a lateral scraping operation is applied, When the protective sheet 1 slides relative to the lower protective sheet 1, damage to the lower protective sheet 1 is prevented, and the safety of the buried pipe is increased. In FIG. 9, 7 is a marker sheet of the buried pipe P buried in the lower part.

  Moreover, the connection part of the terminal end of the strip | belt-shaped protection sheet | seat 1 and the start end of the protection sheet | seat 1 is overlapped and installed by predetermined distance L, as shown in FIG. Of course, the overlapping protective sheets 1 may be fixed to each other by a locking tool such as a staple or a clip.

  According to the first embodiment, the longitudinal resin band 2 and the lateral resin band 3 that are stretch-molded, crystal-oriented in the length direction and have a predetermined strength are alternately woven, thereby resisting the hitting of the excavating tool of the excavating machine. The protective sheet 1 having impact resistance can be formed. In addition, by stacking and orienting the two vertical resin bands 2, strength can be improved and flexibility in the width direction can be improved. As a result, the protective sheet 1 arranged in the length direction of the buried pipe P can be easily bent in the width direction, and can be wound around the buried pipe P with a direct winding construction type or embedded with a curved surface construction type. It is possible to easily perform the work of arranging the curved surface laying type through the covering soil in the upper part of the pipe P, and the strength and workability of the protective sheet 1 can be improved.

  In addition, as shown in FIG. 12, you may attach the strip | belt-shaped marker sheet 6 on the surface of the strip | belt-shaped protection sheet | seat 1 so that peeling is possible with an excavation tool. The sign sheet 6 includes a sign symbol, that is, a note on the buried pipe, the type and position of the buried pipe, and the date of the buried pipe. The sign sheet 6 is a thin resin sheet, printed on the surface with cautions such as buried pipes, and woven back at predetermined intervals in the length direction. When the excavating tool hooks the sign sheet 6, the protective sheet The presence of the buried pipe can be notified by being easily peeled from 1, pulled out and exposed.

  Of course, it may be of a uniform flat shape, for example, it may be heat-welded directly to the entire surface of the protective sheet 1 on a resin film (laminated film or the like), and a sign symbol may be printed on the resin film. Further, the sign symbol can be directly printed or written on the surface of the protective sheet 1.

Further, the protective sheet 1 may be configured by alternately weaving three vertical resin bands 2 and one horizontal resin band 3.
A modification of the first embodiment will be described with reference to FIGS.

[Modification 1-1]
The protective sheet 1 according to Embodiment 1 is composed of two vertical resin bands 2 and one horizontal resin band 3, but in this modified example 1-1, as shown in FIG. The protective sheet 11 is composed of two resin bands 2 every other one and all the lateral resin bands 3. That is, the vertical resin band 2, vertical Resin Band _{2 1,} 2 _{3, 2} 5 ... _{2 n} is two _{stacked, 3 2, 3 4, 3} 6, ... 3 n-1 is composed of one.

[Modification 1-2]
As shown in FIG. 15, the protective sheet 12 of the modified example 1-2 is configured by two vertical resin bands 2 every two sheets, and all the horizontal resin bands 3 are composed of one sheet. That is, in the vertical resin band 12, two vertical resin bands 2 ₁ , 2 ₄ , 2 ₇ ... 2 _n are stacked, and 2 ₂ , 2 ₃ , 2 ₅ , 2 ₆ ... 2 _{n− 2} , 2 _n−1 are 1 The protective sheet 12 is composed of a single sheet.

According to the modified examples 1-1 and 1-2, the flexibility in the width direction can be further improved.
[Modification 1-3]
As shown in FIG. 16, the protective sheet 13 of Modification 1-3 is configured such that all the vertical resin bands 2 are overlapped, and all the horizontal resin bands 3 are two protective sheets 13.

According to the modified examples 1-1 to 1-3, the overall strength of the protective sheets 11 to 13 and the flexibility in the width direction can be ensured.
In addition, the protective sheet in which the number of the vertical resin bands 2 and the number of the horizontal resin bands 3 in the modified examples 1-1 to 3 are reversed may be used, thereby ensuring flexibility in the length direction. It can be easily wound into a roll.

[Embodiment 2]
As shown in FIGS. 17 to 21, the belt-shaped protective sheet 21 of the second embodiment has the same number of the vertical resin bands 2 and the horizontal resin bands 3 that are alternately woven so as to be orthogonally crossed so that there is almost no gap. The protective sheet 21 in which the horizontal resin band 3 and the vertical resin band 2 shown in FIGS.

According to the protective sheet 21 of the second embodiment, it is possible to ensure equal flexibility in both the length direction and the width direction.
[Modification 2-1]
FIG. 20 shows a protective sheet 22 in which two horizontal resin bands 3 and two vertical resin bands 2 are overlapped and alternately woven.

[Modification 2-3]
FIG. 21 shows a protective sheet 23 in which three horizontal resin bands 3 and three vertical resin bands 2 are stacked and alternately woven.

According to the protective sheets 22 and 23, uniform flexibility can be ensured in both the length direction and the width direction.
[Experiment 1]
In Experiment 1, as shown in FIG. 11 (a), two protective sheets 1 (longitudinal resin band 2, transverse resin band 1) are arranged and fixed on a sufficiently compacted sand surface, capacity using 0.4 m ³ of the drilling machine (backhoe), at set predetermined swing down speed excavator, the bucket B 1 m, the drop action swung down from a height of 2m downward, hitting Gave. Further, the bucket B was pulled about 20 cm horizontally, and a lateral pull-in operation was added. This is in order to make it approach the operation performed for the actual excavation work. This was visually observed.

上記実験１によれば、バケットの衝撃で防護シートが損傷することがなく、また横方向の引込動作でも、防護シート１が損傷することはなかった。これは表層の防護シート１がバケットの打撃を吸収しながら滑ることで、防護性能が高まったためであると推測された。

According to the experiment 1, the protective sheet was not damaged by the impact of the bucket, and the protective sheet 1 was not damaged even in the horizontal pull-in operation. It was speculated that this was because the protective performance of the surface protective sheet 1 was improved by sliding while absorbing the impact of the bucket.

[Experiment 2]
In the second experiment, as shown in FIG. 11 (b), a piece of protective sheet 1 is directly wound around a pipe (PE pipe: diameter 100 mm) P to which an internal pressure of 0.1 MPa is applied, and the sand is sufficiently compressed. The both ends of the protective sheet were fixed, and then the bucket was lowered using a bucket excavator (backhoe) with a capacity of 0.4 m ³ . The trace of the protective sheet 1 was confirmed visually.

上記実験２によれば、配管に凹みが確認できたが、配管からの漏洩は見られなかった。

According to the experiment 2, a dent was confirmed in the pipe, but no leakage from the pipe was observed.

[Experiment 3]
As shown in FIG. 11 (c), in Experiment 2, a sand bag S having a thickness of about 5 cm is interposed between the pipe P and the protective sheet 1, which is close to the actual buried state of the pipe. The pipe P is a PE pipe having a diameter of 100 mm or 200 mm. Moreover, the bucket B implemented only the descent | fall operation | movement, and added the horizontal pull-in operation | movement to the descent | fall operation | movement.

上記実験３によれば、全ての防護シート１によれば、配管Ｐに損傷はなく、表層の防護シートにのみ衝撃痕跡を残した程度であった。これは、防護シート１と配管Ｐのに間の砂袋Ｓが、衝撃を緩和したものと考えられる。この状態は、実際の使用状態である図８の状態とほぼ等しいものと考えられる。

According to Experiment 3 described above, according to all the protective sheets 1, there was no damage to the pipe P, and only an impact trace was left on the surface protective sheet. This is considered that the sand bag S between the protective sheet 1 and the pipe P alleviates the impact. This state is considered to be substantially equal to the state of FIG. 8 which is an actual use state.

1 is a schematic perspective view of a protective sheet according to a first embodiment of the present invention in a laid state. FIG. It is a partial expansion perspective view of the protection sheet. It is a partial expansion perspective view of the resin band. It is AA sectional drawing shown in FIG. It is BB sectional drawing shown in FIG. It is the E section enlarged view shown in FIG. It is sectional drawing which shows the protection sheet of the installation state by a plane installation type. It is sectional drawing which shows the protection sheet of the installation state by a circular arc surface installation type. It is sectional drawing which shows the protection sheet of the installation state by a direct winding installation type. It is sectional drawing which shows the connection part of the same protection sheet. (A)-(c) is a side view which shows the test state of Experiment 1-3, respectively. (A) is a schematic perspective view which shows the use condition which attached the label | marker sheet | seat to the protection sheet, (b) is the elements on larger scale. It is a fragmentary top view explaining the modification of the same protection sheet. It is a transverse cross section showing modification 1-1 of the protection sheet. It is a cross-sectional view showing a modified example 1-2 of the protective sheet. It is a cross-sectional view showing Modification 1-3 of the protective sheet. FIG. 6 is a schematic perspective view of a protective sheet according to the present invention, showing a second embodiment. It is CC sectional drawing shown in FIG. It is DD sectional drawing shown in FIG. It is the elements on larger scale which show modification 2-1 of the same protection sheet. It is the elements on larger scale which show modification 2-2 of the same protection sheet.

Explanation of symbols

1, 11-13, 21-23 Protective sheet 1 'Roll-shaped protective sheet 2 Vertical resin band 3 Horizontal resin band 4 Embossed pattern 5 Joint 6 Marking sheet 7 Marking sheet

Claims (7)

A buried pipe protection sheet that covers at least the upper part of the buried pipe around the buried pipe or through a covering soil,
A buried pipe protective sheet that is formed by alternately weaving vertical resin bands and horizontal resin bands, which are formed by stretching synthetic resin, into a sheet shape and using one or more layers. The buried pipe protective sheet according to claim 1, wherein a plurality of the vertical resin bands and the horizontal resin bands are woven in layers. The buried pipe protective sheet according to claim 2, wherein at least the vertical resin band is woven in a greater number than the horizontal resin band, thereby increasing flexibility in the width direction in the length direction. The buried pipe protection sheet according to claim 2 or 3, wherein a plurality of resin bands are stacked for each predetermined number. The vertical resin band and the horizontal resin band are made of polypropylene, each having a thickness of 0.4 mm to 2.0 mm and a width of 9 mm to 30 mm,
The buried pipe protective sheet according to any one of claims 1 to 4, wherein an embossing is performed on a front surface and a back surface of each resin band. The buried pipe protection sheet according to any one of claims 1 to 5, wherein a joint portion in which a vertical resin band and a horizontal resin band are welded to each other is formed on both side edges of the sheet. The buried pipe protection sheet according to any one of claims 1 to 6, wherein a sign symbol is printed on the surface directly or via a resin film adhered to the surface.

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