JPH11286986A - Synthetic resin-made u-shaped gutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lightweight synthetic resin-made U-shaped gutter having high rigidity and strength and free from the breakage of a reverse rib. SOLUTION: A synthetic resin-made U-shaped gutter is formed by forming outward swollen parts 3 extending from a bottom wall 1 to lateral side walls 2, 2, forming a reverse rib 4 on the lower surface between the swollen parts 3 of the bottom wall 1, and including a reinforcing fiber in each of the bottom wall 1, the side walls 2, 2 and the reverse rib 4. The rigidity and strength of the U-shaped gutter can be enhanced by the formation of the swollen part 3 and the inclusion of the reinforcing fiber into the bottom wall 1 and the side walls 2, 2, and the cutting breakage of the reverse rib 4 is prevented by the inclusion of the reinforcing fiber into the reverse rib 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a synthetic resin U-shaped groove used as a drain groove such as a side groove.

[0002]

2. Description of the Related Art In recent years, lightweight U-shaped grooves made of synthetic resin have been used instead of concrete U-shaped grooves for construction of side gutters at the road end. However, the U-shaped groove made of synthetic resin is inferior in pressure resistance compared to the U-shaped groove made of concrete, and there is a problem that the left and right side walls receiving the earth pressure are easily depressed and deformed inward. In addition, since the strength of the bottom wall is not large, there is a problem that when the worker enters the U-shaped groove and works or walks in the U-shaped groove, the bottom wall is deformed and squeezed.

Therefore, U-shaped grooves made of synthetic resin as shown in FIGS. 1, 2 and 5 have been developed. 1, 2, and 5 are a front view, a plan view, and an enlarged sectional view of the U-shaped groove, respectively.
As shown, outwardly protruding portions 3 are formed at predetermined intervals over the bottom wall 1 and the left and right side walls 2 and 2, and a back rib 4 is formed on the lower surface between the protruding portions of the bottom wall 1. It has a structure.

Since the rigidity of the U-shaped groove made of synthetic resin is enhanced by the outwardly bulging portion 3, even if the left and right side walls 2, 2 are subjected to earth pressure, they are unlikely to dent and deform. In addition, since the bottom wall 1 is reinforced by the back rib 4,
Even if an operator enters the U-shaped groove, it becomes difficult for the bottom wall 1 to limp. When the U-shaped groove is formed at a steep angle along a mountain path or a slope, the flow rate of the drainage flowing in the U-shaped groove can be suppressed by the bulging portion 3.

[0005] However, the rigidity and strength of the above-mentioned synthetic resin U-shaped groove are still unsatisfactory, and the development of a synthetic resin U-shaped groove having higher rigidity and strength has been demanded.

On the other hand, a stampable sheet has been developed as a material for molding a synthetic resin molded article having high rigidity and strength by a hot press molding method. This stampable sheet is a heat pressable sheet containing a thermoplastic synthetic resin as a matrix resin and containing reinforcing fibers such as glass fibers, and is manufactured by a laminating method and a wet fiber dispersing method (papermaking). Method) and those manufactured by a dry fiber dispersion method.

As shown in FIG. 6, a stampable sheet manufactured by a laminating method has an intermediate thermoplastic resin layer 11.
Is a multi-layer sheet in which mats of reinforcing fibers 12 and 12 are laminated on both surfaces and the surfaces of these mats are covered with thermoplastic resin films 13 and 13. A stampable sheet manufactured by a wet fiber dispersion method (papermaking method) is a sheet in which a resin powder and a reinforcing fiber suspended and mixed in a liquid are supplied onto a porous belt and dried to form a sheet. The stampable sheet manufactured by the dry fiber dispersion method is a sheet obtained by stirring and mixing a resin powder and a reinforcing fiber in a gas. Of these, stampable sheets manufactured by a laminating method occupy the mainstream, and other stampable sheets are not widely used.

When a synthetic resin U-shaped groove is hot-pressed using such a stampable sheet, a synthetic resin U-shaped groove having increased rigidity and strength by a reinforcing fiber can be obtained. There were the following problems.

[0009]

That is, a stampable sheet, particularly a stampable sheet manufactured by a laminating method, has a good flow of resin during hot press molding, but has a poor flowability of reinforcing fibers. When the above-mentioned synthetic resin U-shaped groove is hot-pressed using a sheet, as shown in FIG. 5, although the bottom wall 1 and the left and right side walls 2 and 2 contain the reinforcing fibers 12, the bottom rib 1 and the back ribs 4 There is a problem that it is difficult for the reinforcing fiber 12 to flow into the small portion, and it is difficult to obtain a synthetic resin U-shaped groove containing the reinforcing fiber 12 up to the back rib 4.

As described above, the U-shaped groove made of synthetic resin in which the reinforcing fibers 12 do not enter the back ribs 4 is such that when the left and right side walls 2 and 2 are dented and deformed inward due to a large earth pressure, the bulging portions 3 and There is a disadvantage that the bottom wall 1 is deformed so that the interval between the portions 3 is widened, and a tensile force acts on the back rib 4 to cause breakage.

[0011] This inconvenience is caused by increasing the thickness of the bottom wall 1 of the U-shaped groove made of synthetic resin so that the reinforcing fibers 12 can flow easily, or by enlarging the back rib 4 itself so that the reinforcing fibers 12 can easily flow. Can be eliminated. However, if the bottom wall 1 is made thicker or the back ribs 4 are made larger, the weight of the U-shaped groove is greatly increased, and construction work on mountain roads and slopes becomes difficult. It is impossible to increase the size of the ribs 4 in practice. At present, a synthetic resin U-shaped groove including the reinforcing fibers 12 up to the back ribs 4 has not been developed yet.

The present invention has been made in view of the above, and an object of the present invention is to provide a lightweight synthetic resin U-shaped groove containing reinforcing fibers, which has high rigidity and strength and does not cause breakage of the back rib. To provide.

[0013]

In order to achieve the above object, a U-shaped groove made of synthetic resin according to the first aspect of the present invention has an outwardly protruding portion defined between a bottom wall and left and right side walls. A U-shaped groove formed at intervals and formed with a thin back rib on the lower surface between the bulging portions of the bottom wall, and the bottom wall, the side wall, and the back rib each contain reinforcing fibers. It is characterized by the following.

The U-shaped groove made of synthetic resin has an outwardly bulging portion formed between the bottom wall and the left and right side walls, and the bottom wall and the side wall contain reinforcing fibers. The rigidity and strength are high, and even if the left and right side walls receive a large earth pressure, they hardly dent and deform inward. In addition, the reinforcing fibers enter the thin back ribs, and the bottom ribs are sufficiently reinforced by the back ribs, so that even if the operator enters the U-shaped groove, the bottom wall does not limp and the back ribs are pulled. Even when a force is applied, cutting and breaking can be prevented by the effect of the reinforcing fiber.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

A synthetic resin U according to a specific embodiment of the present invention
The U-shaped groove has an overall shape as shown in FIGS. That is, a large number of outwardly bulging portions 3 are formed at predetermined intervals in the longitudinal direction over the bottom wall 1 and the right and left side walls 2 and 2 rising from both sides thereof. At the upper end, a protruding edge 5 is formed outwardly over the entire length.
As shown in FIGS. 1 and 3, on the lower surface between the bulging portions 3 of the bottom wall 1, three thin back ribs 4 are formed at intervals in the width direction. .

Even if this back rib 4 is formed only in one place,
It may be formed at two places or at four or more places. The height of the back rib 4 is suitably equal to or less than the height of the bulging portion 3, and the width thereof is suitably approximately 5 mm or less.

Further, one end portions of the left and right side walls 2 and 2 in the longitudinal direction are internally fitted connecting wall portions 21 and 21 which protrude outward in an arc shape.
The other end portions in the longitudinal direction of the left and right side walls 2 and 2 correspond to the outer fitting connection wall portions 2 which protrude outward in an arc shape.
2, 22 are formed. Then, the waterproofing packing 6 is attached to the outer fitting connection wall portions 22 and 22 and the bottom wall 1. Therefore, the inner fitting connecting wall portions 21 and 21 of the next synthetic resin U-shaped groove are fitted into the outer fitting connecting wall portions 22 and 22 of the synthetic resin U-shaped groove, and the watertight packing 6 is attached. When the U-shaped groove is brought into close contact with the lower surface of the end of the bottom wall 1, both U-shaped grooves can be connected in a watertight manner at a desired angle.

As shown in FIG. 3, the synthetic resin U-shaped groove is characterized in that reinforcing fibers 12 such as glass fiber are formed by a bottom wall 1, left and right side walls 2, 2 and thin back ribs 4, 4, 4. It is in that it is included in both. Such a thin back rib 4
The synthetic resin U-shaped groove into which the reinforcing fibers 12 are inserted is shown in FIG.
Use the stampable sheet described above, which has been punched with a countless number of holes using a needle punch, etc., sandwiching this between a male mold and a female mold for forming a U-shaped groove, and heating both molds. By press-molding with, it can be easily manufactured. When a stampable sheet having an infinite number of holes as described above is used, a U-shaped groove in which the reinforcing fiber 12 is provided up to the back rib 4 is obtained by performing a hole punching process using a needle punch to reinforce the stampable sheet. This is because the fibers 12 are cut relatively short, and the flowability of the reinforcing fibers 12 during hot press molding is improved.

Further, a stampable sheet obtained by suspending and mixing a relatively short (about 10 to 100 mm) reinforcing fiber and resin particles in a liquid to obtain a wet fiber dispersion method (papermaking method) may be used. The U-shaped groove made of synthetic resin containing the reinforcing fibers 12 up to the back rib 4 can be manufactured.

The type of resin and fibers of the stampable sheet are not particularly limited. For example, a thermoplastic resin such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polyamide, or polyphenylene sulfide is used as a matrix resin, All stampable sheets containing fibers, carbon fibers, organic fibers and the like as reinforcing fibers can be used. The mixing ratio of the matrix resin and the reinforcing fibers is not particularly limited, but the matrix resin and the reinforcing fibers are mixed so that a U-shaped groove made of a synthetic resin having a fiber content of 10 to 50% by weight and having excellent toughness can be produced. The blended stampable sheet is preferably used.

When the U-shaped groove made of synthetic resin having the above structure is buried while being connected as a side groove on a road or a mountain road, or as a drainage groove on a slope, the outward bulging portion 3 meshes with the soil. Sliding movement of the U-shaped groove can be prevented, and
The flow rate of the drainage flowing in the U-shaped groove can be suppressed by the bulging portion 3.

Moreover, the U-shaped groove made of synthetic resin is
The rigidity and strength are greatly increased by the reinforcing fibers 12 and the outward bulging portions 3 included in the left and right side walls 2, 2. There is almost no dent deformation. And the reinforcing fibers 12
The bottom wall 1 is sufficiently reinforced by the back rib 4 so that the bottom wall 1 does not limp even when an operator enters the U-shaped groove. It does not break even when a tensile force is applied to it.

When the synthetic resin U-shaped groove is to be buried, it is desirable to fix the U-shaped groove so that the U-shaped groove does not float by means of a floating prevention device. It is desirable to prevent accumulation in the U-shaped groove or to prevent a person from stepping off the foot at the opening at the upper end of the U-shaped groove.

[0025]

As is apparent from the above description, the synthetic resin U-shaped groove of the present invention has high rigidity and strength despite its light weight, so that even if the left and right side walls are subjected to a large earth pressure. It is difficult to dent inward and deform, and the reinforcing fiber is contained in the thin back rib, so the bottom wall is sufficiently reinforced and it does not limp, and cutting breakage is sufficiently prevented even if tensile force acts on the back rib. It has a remarkable effect such as

[Brief description of the drawings]

FIG. 1 is a front view of a synthetic resin U-shaped groove according to an embodiment of the present invention.

FIG. 2 is a plan view of the synthetic resin U-shaped groove.

FIG. 3 is an enlarged sectional view taken along line AA of FIG. 1;

FIG. 4 is an enlarged sectional view taken along line BB of FIG. 1;

FIG. 5 is an enlarged sectional view of a conventional synthetic resin U-shaped groove formed by a stampable sheet.

FIG. 6 is a sectional view showing an example of a stampable sheet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bottom wall 2 Side wall 3 Outward bulging part 4 Back rib 5 Projecting edge 6 Waterproof packing 12 Reinforcing fiber

Claims (1)

[Claims] 1. A U-shaped groove in which outwardly bulging portions are formed at predetermined intervals over a bottom wall and left and right side walls, and a thin back rib is formed on a lower surface between the bulging portions of the bottom wall. A synthetic resin U-shaped groove, wherein the bottom wall, the side wall, and the back rib each contain a reinforcing fiber.