JPH1182811A - Supporting base for underground pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a supporting base not only excellent in durability but also relatively light in weight and easy to handle by including a supporting surface supportable of an underground pipe and forming it with a synthetic resin. SOLUTION: The supporting base 1, which is formed of a synthetic resin approximate to a rectangular parallelepiped (a plate shape), is provided with recesses (holes) 2 on the top surface and recesses (holes) 3 on the under surface so as to alternate with each other. These recesses 2, 3 are, so called, lightening holes which can be formed in a suitable shape such as providing the recesses 2, 3 on the top surface and the under surface of the supporting base 1 in the direction confronting with each other and leaving a partition wall (on the bottom) in the center. There are such dimensional examples of supporting bases 1 as 30 mm×115 mm×340 mm and 40 mm×105 mm×450 mm. Supporting bases 1 of these dimensions are most suitable for use as underlayers for relatively frequently used sewerage pipelines (20 cm or 30 cm diameter and about 2 m long). Lightening holes are to serve for strengthening, lightening weight, deforming during forming and shortening the forming time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support base for underground pipes mainly for water supply and sewerage.

[0002]

2. Description of the Related Art For example, when a sewer pipe is buried in the ground, the slope of the sewer pipe is set to about 3/100 (up or down 3 mm for every 1000 mm extension) so that sewage flows easily. And, in order to make it easy to adjust the inclination angle of the sewer pipe at the time of construction, conventionally, a wooden board (plate)
Or wooden blocks were used as support bases for sewer pipes. In addition, since the sewer pipe having a diameter of about 20 cm to 30 cm and a length of about 2 m is often used, the spacing between the supporting bases is generally about 1 m.

[0003]

However, when a conventional wooden support base is buried in the ground for a long period of time, it may corrode, and as a result, sewer pipes may move due to vibration of a passing vehicle or an earthquake. The inclination may change. Although wood itself can be said to be a material having a relatively small density and lightness, it needs to have strength to support a sewer pipe, so that the support base needs to be relatively large, which makes it heavy. In addition, if it is raining at the time of storage, it absorbs water and becomes heavier, and as a result, handling during transportation, burying work, and the like is difficult. On the other hand, making holes in wood for weight reduction would increase the manufacturing cost.

[0004] The present invention has been made in view of the above problems, and has as its object to provide a relatively lightweight, easy to handle, and durable support base.

[0005]

In order to achieve the above object, the following support base for underground pipes has been created. That is, the first invention is characterized in that it has a support surface capable of supporting an underground pipe and is formed of a synthetic resin material. Since this support base is formed of a synthetic resin material, it is hardly corroded, and its service life can be extended as compared with a conventional wooden base.

A second invention is characterized in that the support base for the underground pipe according to the first invention is formed in a substantially rectangular parallelepiped and has a recessed portion. Since the support base is formed in a substantially rectangular parallelepiped, the construction of the underground pipe can be performed in the same manner as in the related art, and the operator is not confused. In addition, the material is saved and the weight is reduced by the meat-slack portion, and handling in transportation, burying work, and the like becomes easy. In addition, since it is a molded product of a synthetic resin material, even if the shape of the recessed portion is relatively complicated, the cost does not increase.

According to a third aspect of the present invention, in the support base for underground pipes according to the first or second aspect, the synthetic resin material is made of a synthetic metal waste material and / or a recycled heavy metal such as lead. Is characterized by being removed. That is, recycling of synthetic resin waste and effective use of resources are achieved. Moreover, since heavy metals have been removed, there is no risk of contaminating the ground (soil).

[0008]

Next, an embodiment of the present invention will be described with reference to FIGS. The support base 1 shown in FIG. 1 and FIG. 2 is formed of a synthetic resin material into a substantially rectangular parallelepiped (plate shape), and the concave portion (hole) 2 on the upper surface side and the concave portion (hole) 3 on the lower surface side are alternated. It is provided as follows. These recesses 2 and 3 are the dull portions in the present invention. In addition, as in the case of the support base 1 'shown in FIGS. 3 and 4, the recessed portion is provided in the direction in which the concave portions 2' and 3 'abut against each other from both upper and lower surfaces, and a partition wall (bottom portion) 4' is provided at the center.
, Etc., can be used. As an example of the dimensions of the support base 1, 30mm x 115mm x 340m
m or 40mm x 105mm x 450mm. The support base 1 having these dimensions is a size suitable for being used as an underlay of a sewer pipe (diameter 20 cm or 30 cm, length of about 2 m) which is used relatively frequently.

The above-mentioned support bases 1 and 1 ′ are provided with necessary strength by providing a molded part with a recessed portion, so that the weight can be reduced, the deformation at the time of molding is reduced, and the molding time is reduced. (About 5 minutes is reduced to about 50 seconds).

A comparison between the support base 1 or 1 'and a conventional support base made of wood is as follows. That is, about 20 times compared to a wooden support base of similar size.
Since the weight can be reduced by% to 30%, it is easy to handle and can greatly contribute to improvement of workability.

The synthetic resin material used for molding the support base 1 is preferably recycled using synthetic resin waste. Since the support base 1 does not require much accuracy in dimensions and shape, the support base 1 is also suitable for use of synthetic resin waste. Examples of synthetic resin waste materials include synthetic resin waste materials generated during material switching (for example, switching between ABS and PP) such as injection molding and blow molding, or synthetic resin materials whose products have been cut off after molding. In addition to waste materials, there are used various synthetic resin products. However, among synthetic resin waste materials that contain harmful heavy metals such as lead, it is necessary to prevent underground (soil) contamination by completely removing the heavy metals before use.

Next, the manner of use of the support base 1 will be described. For example, when burying an underground pipe such as a sewer pipe in the ground, as shown in FIG. 5, a plurality of pipes (in this example, the bottom surface H of a pipe burial recess (groove) in the dug ground). The two support bases 1 are arranged at predetermined intervals (about 1 m) in the front-rear direction,
Each support base 1 is made substantially horizontal using a hammer or the like, and height adjustment in the front-rear direction corresponding to the inclination of the pipe is performed.
A sewer pipe W is placed between the upper surfaces of the front and rear support bases 1. The inclination angle of the sewer pipe W is relatively increased by inserting a spacer having a desired plate thickness between at least one of the upper surfaces of the support bases 1 arranged before and after and the lower part of the outer peripheral surface of the sewer pipe W. It can be easily fine-tuned.

After that, the burial work of the sewage pipe W is completed by backfilling the dug recess for burying the pipe with the earth and stone. Since the support base 1 used here is formed of a synthetic resin material, even if it is buried in the ground for a long time, it does not easily corrode and has excellent durability, and the inclination of the sewer pipe W held in a fixed posture is maintained. However, it does not change easily due to the vibration of passing vehicles or an earthquake.

Next, another example of the support base 1 will be described with reference to FIG. As shown in the figure, the sewer pipe W can be more stably supported by forming the support base 10 into a concave shape at the center. That is, if the conventional wooden support base is formed in such a shape, the number of processing steps is increased, which is not practical. In this regard, since the support base 10 is a molded product of a synthetic resin material, an increase in manufacturing cost can be avoided. Although not shown, the support base 10 may be provided with the same recessed portion as the support base 1 described above.

[0015]

As described in detail above, by forming the support base for the underground pipe from a synthetic resin material, corrosion can be avoided and the service life can be prolonged. In addition, since the weight of the support base is reduced by the recessed portions, the support base can be easily handled and workability can be improved. In addition, when recycling synthetic resin waste materials and removing harmful heavy metals, soil contamination can be prevented.

[Brief description of the drawings]

FIG. 1 is a plan view of a support base of the present invention.

FIG. 2 is a sectional view taken along line BB of FIG.

FIG. 3 is a plan view illustrating another example of the support base.

FIG. 4 is a sectional view taken along line CC of FIG. 3;

FIG. 5 is a diagram illustrating a support base and a sewer pipe.

FIG. 6 is a perspective view showing still another example of a support base.

[Explanation of symbols]

 1, 1 'support base 2, 2' concave part (meat-thin part) 3, 3 'concave part (meat-thin part) W sewer pipe (underground pipe)

Claims (3)

[Claims] 1. A support base for an underground pipe formed of a synthetic resin having a support surface capable of supporting the underground pipe. 2. The support base for an underground pipe according to claim 1, wherein the support base is formed in a substantially rectangular parallelepiped and has a recessed portion. 3. The support base for underground pipes according to claim 1, wherein said synthetic resin material is obtained by removing heavy metals such as lead from synthetic resin waste materials and / or synthetic resin recycled materials. Characteristic support base for underground pipes.