JP2011094674A - Method of protecting resin pipe, and resin pipe protecting member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a protecting method for improving the strength of a resin pipe, especially a resin pipe embedded into the ground, and capable of surely imparting strength, and to provide a resin pipe protecting member of a simple constitution and easy to be handled. <P>SOLUTION: Ring members having vertical surface 2 vertical to an axis P at one end thereof and having inclined surfaces 3 inclined at predetermined angles with respect to the axis P at the other end thereof and having required widths and required diameters are continuously fitted to a resin pipe, appropriately combining either the end surface 2 or 3 of one ring member 1A with either the end surface 2 or 3 of the other ring member 1B to improve the strength of the resin pipe against external pressure. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a method for protecting a resin pipe embedded in the ground used for laying water and sewage systems and communication cables, and a protective member for a resin pipe used in the protection method. It belongs to construction technology.

Most of the resin pipes used for laying water and sewage systems and communication cables are buried in the ground.
However, resin pipes buried in the ground are caused by vibrations caused by running of heavy vehicles, etc., or by vibrations caused by earthquakes, liquefaction of earth and sand, and unjust settlement due to differences in earth pressure. Thus, there is a risk of damage, and in the worst case, there is a risk that the resin pipe itself may break, and accidents are often reported in practice.

In order to solve these problems, for example, Japanese Laid-Open Patent Publication No. 03-33581 (Patent Document 1) proposes a method for reinforcing a buried pipe intended for a buried resin pipe.
This method of reinforcing the buried pipe is a rectangular column or cylindrical block reinforcing material made of foamed resin such as polystyrene foam, covering the resin pipe buried in the ground, and reliably increasing the strength of the resin pipe against the external pressure. Is.

Japanese Patent Laid-Open No. 7-293780 (Patent Document 2) proposes a protective sheet for piping that is used by being directly wound around an embedded pipe.
In this protective sheet for piping, a cushion layer, kraft paper, and a protective layer made of synthetic resin are sequentially laminated, and each member is formed as a laminate having an integral structure with a binder, and an adhesive layer is formed on each cushion layer surface. Is applied.
With such a protective sheet for piping, even if a 2 kg piece of iron is dropped 10 times from a height of 2 m, the damage to the resin (polyethylene) pipe can only be caused by shallow streak that cannot be measured. It is said that it is sufficiently effective as a protective sheet.

  In addition, in order to improve the strength of the resin pipe itself, as shown in Patent Document 1, the thickness of the pipe is increased, or as disclosed in JP-A-2002-199531 (Patent Document 3). As described above, it has been conventionally performed to attach a rib to a resin pipe.

  Furthermore, regarding resin pipes having bent portions (curved pipe portions), a special method, that is, heat shrinkable rubber is used as a main material, and after extrusion vulcanization, fitting is performed by heating and cooling. Japanese Patent Application Laid-Open No. 2000-81191 (Patent Document 4) proposes a protector for bent pipes that matches the outer shape of the bent pipe.

This protector for curved pipes is a hollow pipe that has been cut to a predetermined size after extrusion vulcanization, and is pre-formed according to the outer shape of the curved pipe by heating and cooling before being attached to the curved pipe. Because it is molded in a shape that matches the curved pipe to be installed in advance, it does not involve the difficult work of installing a straight protector, and even when the curved pipe is soft, the shape of the protector In addition, there is no deformation such that the bent portion of the bent pipe extends, and there is an effect that the set shape of the bent pipe can be held faithfully.

JP-A-3-33581 (Claims) JP-A-7-293780 (Claims) Japanese Patent Laid-Open No. 2002-199531 (FIGS. 1, 13, and 14) JP 2000-81191 A (Claims)

As described above, various methods have been proposed as methods for protecting resin pipes buried in the ground, but each has advantages and disadvantages and has problems to be solved.
That is, the method using the reinforcing material of the prism or cylindrical block made of the foamed resin of Patent Document 1 makes the construction of the reinforcing material, in particular, their installation and the arrangement of the resin pipes considerably complicated.
In addition, it requires careful handling, and is particularly difficult to apply to curved pipes.

  Furthermore, the method using the protective sheet for piping of Patent Document 2 requires a high level of technology for winding resin pipes, in particular, winding around curved pipes, and a difference in effect due to construction occurs depending on the technique of the installer. In addition, it is difficult to obtain a satisfactory effect because the material requires thorough examination.

In particular, the method of increasing the thickness of the resin pipe shown in Patent Document 1 increases the weight of the pipe and increases the cost and difficulty of construction, as also shown in the same document. .
In addition, the curved pipe with ribs shown in Patent Document 3 has been widely used because it is produced uniformly in the factory and the quality is constant, but all the points including the complexity of the production process are not necessarily included. Is not satisfactory.

That is, since the manufacturing process of a ribbed bent pipe produced in a factory is more complicated than that of a ribbed straight pipe, an increase in manufacturing cost is inevitable.
In addition, since the ribs are provided uniformly in the length direction of the straight pipe, there is a possibility that a great waste is caused as a result of applying the ribs even in places where strength is not required.
Furthermore, the production of ribbed pipes is not a problem with straight pipes, but it is difficult to make ribs on curved pipes, particularly uniform ribs on curved pipes with a large angle. Ribing the tube with uniform quality is currently not producing excellent products.

  Therefore, in order to deal with the curved pipe portion, a curved pipe protector as shown in Patent Document 4 has been proposed. However, in reality, such a curved pipe protector is neither manufactured nor used. It is a technique that requires a considerable amount of technology and is not suitable for generalization as a normal operation.

In view of the present situation, the present invention has been studied to provide a method for protecting a resin pipe that is different from the conventional one, and a protective member for a resin pipe used in the method. The improvement in strength against external pressure is solved by using a resin pipe protective member made of a ring member that can be connected and fitted to both the bent pipe section and the straight pipe section of the resin pipe.

That is, the invention according to claim 1 of the present invention is
An outer peripheral portion of a resin pipe to be protected with a ring member having a required width and diameter, with one end surface being a vertical surface perpendicular to the axis and the other end surface being an inclined surface inclined at a predetermined angle with respect to the axis. The outer surface of one of the ring members and the other end surface of the other ring member are appropriately combined with each other so that the shape matches the shape of the other ring member. A method for protecting a resin pipe characterized by improving the strength against external pressure of the pipe.

The invention according to claim 2 of the present invention is
The method for protecting a resin pipe according to claim 1,
The ring member is
The inclined surfaces are formed so that the vertical surfaces of the ring members are parallel to each other when the inclined surfaces are brought into contact with the inclined surfaces of the other ring members by turning them upside down.

The invention according to claim 3 of the present invention is
In the method for protecting a resin pipe according to claim 1 or 2,
The ring member is
The angle of the inclined surface formed on the other end surface is the same as the angle of the inclined surface formed on the other end surface of the other ring member.

The invention according to claim 4 of the present invention is
In the protection method of the resin-made pipe | tube in any one of Claims 1-3,
The ring member is
The outer peripheral portion has an annular protrusion.

Further, the invention according to claim 5 of the present invention is
One end surface of a cylindrical ring having a required width and diameter is a surface perpendicular to the axis, and the other end surface is a ring-shaped member having an inclined surface inclined at a predetermined angle with respect to the axis. This is a protective member for resin pipes.

The invention according to claim 6 of the present invention provides
In the protective member for resin pipes of Claim 5,
The ring member is
The inclined surfaces are formed so that the vertical surfaces of the ring members are substantially parallel to each other when the inclined surfaces are brought into contact with the inclined surfaces of the other ring members by turning them upside down. .

The invention according to claim 7 of the present invention provides
In the protective member for resin pipes of Claim 5 or 6,
The ring member is
The angle of the inclined surface formed on the other end surface is 2.5 ° with respect to the axis.

The invention according to claim 8 of the present invention provides
In the protective member for resin pipes in any one of Claims 5-7,
The ring member is
The outer peripheral portion has an annular protrusion.

The invention according to claim 9 of the present invention provides
In the protective member for resin pipes in any one of Claims 5-8,
The ring member is
It has a missing part in a part of the annular part.

The method for protecting a resin pipe according to the present invention is a simple operation in which a ring member that can be continuously fitted to a curved pipe portion is continuously fitted on a resin pipe to be protected. The work standard is simplified because it can be done.
At the same time, the work is streamlined and it is possible to protect the parts that need protection within an appropriate range, so unnecessary reinforcement is eliminated, contributing to resource saving and cost reduction. It is what is done.
Moreover, since the outer peripheral part of the resin pipe to be protected is continuously covered with a plurality of ring members, the crushed stone does not directly hit the resin pipe and can be backfilled with crushed stone.

  In particular, the protective member for a resin pipe according to the present invention has an inclined surface in which one end surface of a cylindrical ring having a required width and diameter is a vertical surface with respect to the axis, and the other end surface is inclined with respect to the axis at a predetermined angle. Since it consists of a ring-shaped member as a surface, the structure is simple, the quality is uniform in a factory, and mass production is possible.

In addition, when placing the straight pipe portion according to the outer shape of the resin pipe to be externally fitted, the inclined surfaces of the adjacent ring members are brought into contact with each other in an inverted state with respect to each other. In the case of arranging in a curved pipe part, for example, by arranging ring members in order of vertical plane → vertical plane → inclined plane → inclined plane or vertical plane, the resin pipe protection / reinforcement varies in its performance. It is possible to construct without causing any problems.
Furthermore, it is easy to fit into a resin pipe after construction by providing a missing portion for externally fitting the resin pipe in a part of the ring member constituting the resin pipe protection member. It is possible to achieve effects that could not be achieved with this technology.

It is sectional drawing which shows an example of the protection member for resin pipes concerning this invention. It is a front view of the protection member for resin pipes shown in FIG. It is sectional drawing which shows an example of the combination of the protection member for resin pipes concerning this invention. It is sectional drawing which shows the other example concerning the combination of the protection member for resin pipes of this invention. It is explanatory drawing which shows the use condition of the protection member for resin pipes concerning this invention.

  Embodiments of the resin pipe protecting member according to the present invention will be specifically described below with reference to the accompanying drawings.

  As shown in FIG. 1, the resin pipe protecting member 1 according to the present invention has one end surface of a ring body 1 a having a required width and diameter as a vertical surface 2 perpendicular to the axis P, The other end surface is constituted by a ring member having an inclined surface 3 that is inclined at a predetermined angle with respect to the axis P.

Since such a ring member is used by being externally fitted to an embedded resin pipe, it is molded using a resin such as a hard vinyl chloride resin having a high strength.
In the ring member in which the defect portion 4 is provided in part, it is integrally formed with a semi-rigid vinyl chloride resin.
In addition, it is preferable to adjust the width | variety of the defect | deletion part 4 according to the material of the protection member 1 for resin pipes as needed in that case.

  As is apparent from FIGS. 1 and 2, the ring member is formed with at least one or more annular protrusions 5 surrounding the peripheral surface on the outer peripheral surface of the ring body 1a in order to improve the strength. Is.

The inclined surface formed on the ring member is formed in accordance with the curvature of the curved pipe portion of the resin pipe used as a protective gland, and the inclined surfaces 3 and 3 are brought into contact with each other by reversing the vertical direction. In this case, an inclination angle at which the vertical surfaces 2 and 2 of the ring members are substantially parallel to each other is preferable.
As an example, as shown in FIG. 1, it can be achieved by making the inclined surface 3 inclined at an angle of 2.5 ° with respect to the axis P, for example.
The inclination angle is not particularly limited, and the angle of the inclined surface formed on the other end surface of one ring member may be the same as the angle of the inclined surface formed on the other end surface of the other ring member. .

  As shown in FIG. 3, the resin pipe protection member 1 having such a configuration has an inclined surface 3 of the other resin pipe protection member 1 </ b> B arranged in a vertical direction with respect to the inclined surface 3 of one resin pipe protection member 1 </ b> A. In this combination, the vertical surfaces 2 and 2 of the adjacent resin pipe protection members 1A and 1B are in a substantially parallel state. By repeating this, the resin to be applied It becomes possible to cover the straight pipe portion of the pipe making almost certainly.

In the combination example shown in FIG. 4, the vertical surface 2 of one resin tube protection member 1A and the vertical surface 2 of the other resin tube protection member 1B are abutted in parallel in the same direction. A ring member Z1 made of a pair of ring members having a fan-shaped cross section with a central angle of about 5 ° can be obtained by connecting the protective members for resin pipes 1A and 1B.
Therefore, in the case of a 15 ° bend of the resin pipe to be applied, three sets of two ring members Z1 are connected, and in the case of a 30 ° bend, six sets of two ring members Z1 are connected. Thus, it can be easily and easily fitted on the outer peripheral portion of the bent tube portion.

  In the usage example shown in FIG. 5, the range of the bent pipe portion X1 of the 15 ° bend is such that the two sets of ring members Z1 shown in FIG. 3, by sequentially fitting each of the resin pipe protection members 1A, 1B,... 1X to the resin pipe 6, the outer peripheral portion of the resin pipe 6 is provided with a plurality of resin pipe protection members 1. Can be coated.

  In the present invention, vinyl chloride resin is used for both of the resin pipe protective member 1 and the resin pipe 6, but it is not necessary to make both of them uniform. As the resin, polyolefin resin such as polyethylene, acrylic resin, etc. It is also applicable to pipes using

In addition, after covering the outer peripheral portion of the resin pipe 6 using the plurality of resin pipe protection members 1 in the above procedure, the pipe end of the resin pipe 6 is made of a vinyl chloride resin (not shown), A fixing ring having a slightly smaller inner diameter than the outer diameter of the resin pipe 6 is fitted onto the resin pipe 6 while applying force, and then a rubber-made inner pipe having an inner diameter integrally provided with fins on the outer periphery. The ring-shaped sealing material having the same diameter as the outer diameter of the outer ring 6 is externally fitted to the resin pipe 6, and the fixing ring having the same shape as the fixing ring is further fitted to the resin pipe 6 by the same method. A plurality of resin pipe protection members 1 are held on the resin pipe 6 without using an adhesive, and the resin pipe protection members 1, 1... Continuously fitted from the resin pipe 6 fall off. Can be prevented.

Since the protective member for resin pipes according to the present invention is effective for improving the strength of underground resin pipes, it is effectively used in those industries as a technology effective for construction of water and sewerage systems and buried cables. However, it is not limited to the above-mentioned use, and may be applied to a resin pipe disposed on the ground. In other fields, the purpose is to improve the strength of the pipe. Are likely to be widely used.

DESCRIPTION OF SYMBOLS 1 Protection member for resin pipes 1a Ring body 2 Vertical surface 3 Inclined surface 4 Defect part 5 Annular protrusion P Axis Z1, Z2, Z3 Two ring members

Claims (9)

An outer peripheral portion of a resin pipe to be protected with a ring member having a required width and diameter, with one end surface being a vertical surface perpendicular to the axis and the other end surface being an inclined surface inclined at a predetermined angle with respect to the axis. The outer surface of one of the ring members and the other end surface of the other ring member are appropriately combined with each other so that the shape matches the shape of the other ring member. A method for protecting a resin pipe characterized by improving the strength against external pressure of the pipe. The ring member is
The inclined surface is formed so that the vertical surfaces of the ring members are parallel to each other when the inclined surfaces are brought into contact with the inclined surfaces of the other ring members by turning them upside down. The method for protecting a resin pipe as described. The ring member is
The method for protecting a resin pipe according to claim 1 or 2, wherein the angle of the inclined surface formed on the other end surface is the same as the angle of the inclined surface formed on the other end surface of the other ring member. . The ring member is
The method for protecting a resin pipe according to any one of claims 1 to 3, wherein the outer peripheral portion has an annular protrusion. One end surface of a cylindrical ring having a required width and diameter is a surface perpendicular to the axis, and the other end surface is a ring-shaped member having an inclined surface inclined at a predetermined angle with respect to the axis. Protective member for resin pipe. The ring member is
The said inclined surface is formed so that the vertical surface of each ring member may become a mutually substantially parallel state when it inverts and contacts the inclined surface of another ring member up and down. The protective member for resin pipes as described in 2. The ring member is
The protective member for a resin pipe according to claim 5 or 6, wherein the angle of the inclined surface formed on the other end surface is 2.5 ° with respect to the axis. The ring member is
The protective member for a resin pipe according to any one of claims 5 to 7, wherein the outer peripheral part has an annular protrusion. The ring member is
The protective member for a resin pipe according to any one of claims 5 to 8, wherein the annular part has a deficient part.

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