JP7288566B2 - Protective material - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective material that is wrapped around a plastic gas pipe or the like buried in the ground, for example, in order to increase the impact resistance of the gas pipe or the like.

2. Description of the Related Art In recent years, plastic gas pipes and the like have been widely used as pipes for transporting liquids or gases (for example, water supply and sewage pipes and gas pipes, hereinafter simply referred to as “gas pipes”). In particular, polyethylene pipes are widely used because they are flexible, lightweight, easy to construct, and do not corrode even when buried underground. .

However, this polyethylene pipe has a drawback of low strength against impact. For this reason, when using an excavator to excavate the ground where gas pipes, etc., are buried, the nails of the excavator, etc. hit the gas pipes, etc., which are buried, and damage the gas pipes, etc. There is a risk that it will be lost.

In order to reduce the possibility of damaging the gas pipe or the like in this way, a protective sheet has been developed that is used by being wrapped around the gas pipe or the like (for example, Patent Document 1).

The protective sheet disclosed in Patent Document 1 is constructed by laminating a sheet thinner than the cushion material on the surface of a relatively thick cushion material.

By wrapping such a protective sheet around the surface of a gas pipe or the like in one or more than two layers, it is possible to reduce the possibility of damage to the gas pipe or the like when the claws of an excavator or the like hit the gas pipe or the like. It's like

Japanese Patent Application Laid-Open No. 2007-132370

However, the protective sheet disclosed in Patent Document 1 is not actually used in a single layer around a gas pipe or the like, but is normally used in a double or more wound state. There was a problem that it took time and effort to construct such as.

The main reason why the protective sheet disclosed in Patent Document 1 is not used in a single layer is that after a vertical movement such as inserting the claws of an excavator or the like into the ground, the claws are pulled back toward the main body of the excavator or the like. This largely depends on the request of the builder that, if possible, only the outer surface side of the protective sheet wrapped around the gas pipe or the like should be displaced or torn when such horizontal movement is performed.

When the claws of an excavator, etc., are moved horizontally, only the outer surface of the protective sheet is displaced or broken. This is because it becomes possible to take care not to damage the pipe or the like.

The present invention has been made in view of such problems, and its object is to enable the installer to notice the existence of the gas pipe or the like even if it is used in a single winding for the gas pipe or the like. To provide a protective material for gas pipes, etc., which can cause "displacement" and "tear", thereby facilitating construction on the gas pipes, etc.

According to one aspect of the invention,
a flexible cushioning material;
a flexible lower sheet formed thinner than the cushion material and laminated on the surface of the cushion material;
an upper sheet having flexibility, formed thinner than the cushion material, and disposed so as to abut on the surface of the lower sheet,
A central portion of the upper sheet is slidable with respect to the lower sheet.
Protective materials such as gas pipes are provided.

Preferably, the upper sheet and the lower sheet are integrally connected to each other at either one end.

According to another aspect of the invention,
a flexible cushioning material;
a flexible sheet formed thinner than the cushioning material and disposed so as to abut on the surface of the cushioning material,
A protective member such as a gas pipe is provided, wherein the central portion of the seat is slidable with respect to the cushion member.

Preferably, a non-slip sheet made of a material that does not slip easily on the surface of the gas pipe is laminated on the surface of the cushion material that is in contact with the gas pipe.

According to the present invention, the lower sheet is laminated on the surface of the cushioning material, and the upper sheet is arranged thereon so as to abut against the lower sheet. As a result, when the claws of an excavator, etc., are moved horizontally, only the upper sheet will shift or break against the lower sheet and the cushioning material. , etc. can be noticed, and care can be taken not to damage the gas pipe or the like when moving the claw in the vertical direction.

As a result, even if it is used with a single winding, it is possible to cause "misalignment" or "break" that allows the installer to notice the existence of the gas pipe, etc., so it is easy to install on the gas pipe, etc. Protective materials such as gas pipes could be provided.

1 is a cross-sectional view of a protective material 10 to which the present invention is applied; FIG. 3 is a perspective view showing structures of an upper sheet 16 and a lower sheet 14 that constitute the protective material 10. FIG. 3 is a perspective view showing another structure of the upper sheet 16 and the lower sheet 14 that constitute the protective material 10. FIG. 4 is a perspective view showing still another structure of the upper sheet 16 and the lower sheet 14 that constitute the protective material 10. FIG. FIG. 3 is a cross-sectional view showing a state in which a protective material 10 is wrapped around a gas pipe or the like X; FIG. 10 is a cross-sectional view of a protective material 10 according to Modification 1; FIG. 10 is a cross-sectional view of a protective material 10 according to Modification 2;

(Configuration of protective material 10)
FIG. 1 shows a protective material 10 according to an embodiment to which the invention is applied. The protective material 10 includes a cushion material 12, a lower sheet 14, and an upper sheet 16. - 特許庁

The cushion material 12 has a role of preventing damage to the gas pipe or the like X by receiving the impact force when it is hit by a claw of an excavator or the like, and has a predetermined thickness and flexibility. It is made up of materials that have

Specific examples of the material of the cushioning material 12 include nonwoven fabrics such ^as meltblown nonwoven fabrics and spunbond nonwoven fabrics, sponges, rubbers, and soft resins. is preferred. Moreover, it is preferable that the thickness of the cushion material 12 is within a range (e.g., 8 mm or less) in which the flexibility is not deteriorated to such an extent that the cushion material 12 cannot be wound around the gas pipe X or the like. Of course, the cushion material 12 may be constructed by laminating a plurality of non-woven fabrics, sponges, rubbers, soft resins, or the like.

The lower sheet 14 is a member that is flexible and thinner than the cushioning material 12. For example, the lower sheet 14 is a fibrillated sheet obtained by stretching and fibrillating a polypropylene film obtained by extrusion molding. It is constructed in the form of a sheet with a thickness of about 1 mm in which threads are woven at a density of 13 threads/inch. It is preferable that the defibrated yarn has a denier of 2000 or more and a tensile strength of 80 N/thread or more. Alternatively, a plurality of sheets may be laminated together to form the lower sheet 14 .

Further, the lower sheet 14 is laminated and fixed to the surface of the cushioning material 12 by means such as thermocompression bonding, adhesive, needle punching, or the like.

The upper sheet 16 has flexibility and is thinner than the cushioning material 12. The upper sheet 16 is formed on the surface of the lower sheet 14 (on the side opposite to the surface laminated on the cushioning material 12). surface). In this embodiment, the upper sheet 16 is made of the same material as the lower sheet 14 described above, but it is not limited to this, and the upper sheet 16 is made of a material different from that of the lower sheet 14. may During construction, the protective material 10 may be left outdoors without being buried for about a year while being wrapped around gas pipes X. It is preferable to impart weatherability (for example, UV resistance) to the material.

In this embodiment, as shown in FIG. 2, the upper sheet 16 and the lower sheet 14 are two sheets that are superimposed and fixed to each other by means of thermocompression bonding, welding, adhesion, or the like. It is composed of one member formed by As described above, the upper sheet 16 and the lower sheet 14 are fixed to each other at both ends in the width direction in FIG. It's becoming In addition, the fixing by welding or the like of the upper sheet 16 and the lower sheet 14 as described above may be performed on the entire end portion (see the left end in FIG. 2), or may be performed partially (see the right end in FIG. 2). ).

The structure of the upper sheet 16 and the lower sheet 14 is not limited to this. For example, as shown in FIG. The upper sheet 16 and the lower sheet 14 may be constructed by fixing them to each other by thermocompression bonding, welding, bonding, or other means.

Furthermore, as shown in FIG. 4, the upper sheet 16 and the lower sheet 14 may be formed as one tubular member.

In this way, the upper sheet 16 and the lower sheet 14 are formed by folding a single sheet material into a double layer, or by forming them from a single tubular member, so that at least one of the ends of the sheet is bent. By integrally connecting the upper sheet 16 and the lower sheet 14 to each other, work such as welding at the ends of the upper sheet 16 and the lower sheet 14 can be reduced, and the manufacturing of the protective member 10 is facilitated.

(Characteristics of protective material 10)
In the protective material 10 according to this embodiment, the lower sheet 14 is laminated on the surface of the cushion material 12 , and the upper sheet 16 is placed thereon so as to abut against the lower sheet 14 . As a result, when the claws of an excavator or the like are moved horizontally, only the upper sheet 16 is displaced or broken relative to the lower sheet 14 and the cushioning material 12. It is possible to notice the presence of the gas pipe or the like X that is present, and to take care not to damage the gas pipe or the like X when moving the claw in the vertical direction.

As a result, as shown in FIG. 5, for example, even if the insulation lock Y is used to wrap the gas pipe or the like X in a single winding, the construction worker can notice the existence of the gas pipe or the like X. and "tear", it is possible to provide the protective material 10 for gas pipes X, etc., which can be easily installed.

Furthermore, since the central portion of the upper sheet 16 is slidable relative to the lower sheet 14, only the upper sheet 16 can easily move independently of the lower sheet 14 and the cushioning material 12. Only 16 can be made susceptible to "misalignment" and "tear" easily.

(Modification 1)
In the embodiments described so far, the lower sheet 14 is layered and fixed on the surface of the cushion material 12 by thermocompression bonding or the like, and the upper sheet 16 is disposed thereon so as to be slidable with respect to the lower sheet 14. However, instead of this, as shown in FIG. Only the ends of the lower sheet (sheet) 14 may be attached to the cushion material 12 .

As a result, the lower sheet (sheet) 14 can easily move independently of the cushion material 12, and only the lower sheet (sheet) 14 can be easily "displaced" or "teared".

(Modification 2)
As shown in FIG. 7, the surface of the cushioning material 12 of the protective material 10 according to the above-described embodiment opposite to the surface on which the lower sheet 14 is laminated (that is, the surface of the cushioning material 12 in contact with the gas pipe or the like X) ) may be laminated with a non-slip sheet 20 made of a material that does not slip easily on the surface of X such as a gas pipe.

As a result, when the protective material 10 is wrapped around the gas pipe X, the protective material 10 becomes less likely to slip undesirably on the surface of the gas pipe X, and the work of wrapping the protective material 10 can be carried out more easily.

It should be considered that the embodiments disclosed this time are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the scope of the claims rather than the above description, and is intended to include all modifications within the scope and meaning equivalent to the scope of the claims.

DESCRIPTION OF SYMBOLS 10... Protective material, 12... Cushion material, 14... Lower seat, 16... Upper seat, 20... Anti-slip sheet X... Gas pipe etc., Y... Insulok

Claims (4)

a flexible cushioning material;
a flexible lower sheet formed thinner than the cushion material and laminated on the surface of the cushion material;
an upper sheet having flexibility, formed thinner than the cushion material, and disposed so as to abut on the surface of the lower sheet,
A central portion of the upper sheet is slidable with respect to the lower sheet.
Protective material for gas pipes, etc. 2. The protective material according to claim 1 , wherein the upper sheet and the lower sheet are integrally connected to each other at one end. a flexible cushioning material;
a flexible sheet formed thinner than the cushioning material and disposed so as to abut on the surface of the cushioning material,
A protective material for gas pipes, etc., wherein a central portion of the seat is slidable with respect to the cushion material. 4. Any one of claims 1 to 3 , wherein a non-slip sheet made of a material that does not slip easily on the surface of the gas pipe is laminated on the surface of the cushion material that contacts the gas pipe. Protective material as described in item.

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