JPS6123106Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to a cross drainage ditch that is used by being buried in unpaved roads such as forest roads, farm roads, and roads in parks. Conventionally, as shown in Figure 1, this type of cross-drainage ditch is constructed by digging a floor across the forest road to a specified depth, laying chestnut stone or crushed stone on the floor, and hardening the floor. A drainage ditch main body 2 having a U-shaped cross section is installed in the hole 1 that has been removed, and a cover plate 3 having a size that matches the upper opening 2a is attached to the upper opening 2a of the drainage ditch main body 2. Are known. In the case of the above-mentioned cross-sectional drainage ditch, crushed stones 4 were buried on both sides of the drainage ditch body 2 in places where there was a large amount of traffic such as vehicles and the earth and sand on both sides of the ditch body 2 were easily scooped out. If it is not sufficient and is left in place for a particularly long period of time, the crushed stones will be gouged out by vehicles, exposing both sides of the upper part of the drainage ditch main body 2, and as a result, tires 5 will collide with the exposed parts when a vehicle passes by. There was a problem with it being damaged. In addition, if the ground at the construction site is soft,
The passage of vehicles causes undue subsidence of the road surface, and considerable earth pressure is generated on both sides of the drainage ditch body 2.
There were also problems with the parts shifting or being damaged. In order to solve the above problem, the drain main body 2
It may be possible to use one reinforced by increasing the wall thickness or inserting reinforcing bars.
The length of the drainage ditch body 2 is approximately the same as the width of the forest road.
The length is about 4m, and the weight increases considerably, making transportation and construction difficult, so it cannot be said to be an advantageous solution. Therefore, it is possible to divide the reinforced drain main body 2 into lengths of several centimeters and connect them at the time of construction, but the connection part is weaker than the main body and there is a problem of breakage at the connection part. It's not a perfect solution. The present invention has been made in view of the above circumstances, and its purpose is to provide a transverse drain that can prevent damage to the drain main body without significantly increasing the weight. An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 shows a first embodiment of the transverse drainage ditch of the present invention. In the figure, reference numeral 7 denotes a drain main body having a U-shaped cross section, and 8 a cover plate that covers the upper opening 7a of the drain main body 7. Both the drain main body 7 and the cover plate 8 are made of concrete, and the drain The groove body 7 is buried so as to cross the road, and the cover plate 8 is buried so that its upper surface is exposed to the ground surface. Both end portions 8a, 8a of the cover plate 8 in the road direction protrude from the drain main body 7, and the both end portions 8a, 8a protrude from the drain main body 7.
The ratio L/H of the protruding length L of the drain groove 8a and the depth H of the drain main body 7 is set as follows depending on the ground of the construction site. That is, as shown in FIG. 3, in the case of soft ground, the pressure applied to the ground surface from the tire 5 on the tip A side of both ends 8a, 8a is distributed at a distribution angle of 20 degrees, so the protrusion length L and The ratio L/H of the new height H of the drain main body 7 is set to 0.36 (ten20°) or more. In addition, in the case of normal ground, the above pressure has a distribution angle of 45
Therefore, the ratio L/H of the protruding length L and the depth H of the drain groove main body 7 is set to 1 (ten45°) or more. In addition, in the case of hard ground, the above pressure is distributed at a distribution angle of 50°, so the ratio L/H of the protruding length L and the depth H of the drain groove body 7 is set to 1.2 (ten50°) or more. . By setting the ratio of the protruding length L and the depth H of both end portions 8a, 8a in this manner, the pressure applied to the ground from the tire 5, that is, the earth pressure, does not reach both side surfaces of the drain groove body 7. Further, a large number of conical protrusions 8b are integrally formed on the lower surfaces of both end portions 8a, 8a, that is, the surfaces to be buried underground, and these protrusions 8a dig into the ground. Note that 8c in the figure is a through hole formed in the cover plate 8. According to the first embodiment, the tire 5 collides with the end surfaces of both end portions 8a, 8a, or the tire 5
Even if an impact force is generated due to friction between the drain groove body 8 and the lid body 8, this impact force is dispersed by the convex portion 8b and absorbed by the ground, so that no impact is applied to the drain main body 2. 4 and 6 show a second embodiment of the present invention. In this second embodiment, the drain main body 1 is constructed using substitute materials such as cedar, cypress, and larch.
0 and the cover plate 11. That is, the drain main body 10 is made of a short square piece 12 with a side of 10 cm to 15 cm.
A side wall is fixed between a pair of square-shaped frames b framed by connecting means 13 such as casings, and a plurality of long square timbers 12a cut to match the width of the road are piled up and connected with bolts etc. A plurality of short square pieces cut to be slightly longer than the width of the drain main body 10 are arranged side by side, and a bottom plate connected with bolts or the like is fixed to form a U-shaped cross section. In addition, the lid plate 11 has a side of 10 cm.
A plurality of square timbers 14 of ~15 cm are arranged along the road direction, and these are connected by connecting means such as bolts and spools to form a flat plate. Both ends 11a, 1 of the cover plate 11 in the road direction
1a protrudes from the drain main body 10, and its protruding length L, depth H of the drain main body 10, and ratio L/H are set according to the ground of the construction site as in the first embodiment described above. Note that the end portions of both ends 11a, 11a are supported by sleepers 15 buried in the ground so as to cross the road. In addition, a slight gap is provided between each of the square bars 14 constituting the lid body 11, and the surface of the portion of each square bar 14 located above the upper opening of the drain main body 10 is shaved off and slightly lowered. A through hole 14a is provided in this lowered portion. Therefore, rainwater and the like will flow into the drain main body 10 through the gaps between the square members 14 and the through holes 14a. Incidentally, the square timbers 12, 14 and the railroad ties 15 are each treated with a preservative and insect repellent material injected under high pressure. According to the second embodiment, substitute materials such as cedar, which are unsuitable as building materials and have conventionally only been used as firewood, can be used advantageously, and can be provided at low cost. It is also more flexible than concrete and has greater shock absorption capacity. Furthermore, it is more convenient to transport to the construction site than concrete ones, and furthermore, by changing the number of square timbers 12a that constitute one side wall of the drain main body 10 and the square timbers 12a that constitute the other side wall. The height of the side walls can be changed, making it easy to adapt to the slope of the road surface at the construction site. FIG. 5 shows a third embodiment of the present invention. Note that the same parts in FIG. 5 as those shown in FIG. 4 are designated by the same reference numerals, and the explanation thereof will be omitted. In this third embodiment, both ends 11a, 1
1a is composed of a parallel portion 16a that is approximately parallel to the ground and an inclined portion 16b that is inclined so as to penetrate into the ground.
b are connected to each other by a shaft 17. The sloped portion is supported by sleepers 18 buried underground so as to cross the road. In addition, the parallel part 16
The length a is set according to the ground at the construction site, similar to the protruding length of both ends in the first embodiment described above. In this third embodiment, the inclined portion 16b is subjected to earth pressure, and the action of earth pressure on the drain main body 10 is further inhibited than in the first and second embodiments described above. Can be done. Next, the results of experiments conducted using the conventional product shown in FIG. 1 and the product shown in the first embodiment of the present invention will be explained. Both the conventional product and the example product of the present invention were installed with a length of 4 m. And on these cross drains
100 sudden starts and sudden stops using 11ten tracks
Turning, subsidence of the foundation work part, displacement of the cover plate,
When we observed cracks in the main body of the drain, misalignment of the main body of the drain, and cracks in the connecting parts, we obtained the results shown in the following table.

[Table] The numbers in the table indicate the number of times this occurred. In other words, in the case of the conventional product, the main body of the drain became misaligned after 50 uses, and cracked after 70 uses. Additionally, when the foundation work subsidence occurred, water stagnation was observed within the main body of the drain. Further, on the outside of the lid plate, earth and sand were scooped out and the lid plate sank to some extent in both the conventional product and the example product. In the conventional product, this sinking caused a large impact on the main body of the drain, resulting in the results shown in the table above, but in the example product, the main body of the drain was sufficiently protected despite this subsidence. Although not shown in the above table, similar results were obtained using a substitute material (shown in FIGS. 4 and 5). As explained above, according to the present invention, since both ends of the cover in the road direction protrude from the drain main body, the earth and sand on both sides of the drain main body are not gouged out, and the both ends of the drain main body are prevented from being scooped out. is covered and protected by the lid, so the impact force from the tires does not act directly on both sides of the drain body.
There is no problem of damage to both sides of the drain groove body due to tires as in the conventional case. In addition, since the ratio L/H of the protruding length L of both ends of the lid and the depth H of the drain body is set to be larger than the tangent of the distribution angle of the earth pressure generated at the tip side of both ends, The earth pressure does not reach both sides of the drainage ditch main body, and the drainage ditch main body is not damaged or displaced due to the earth pressure. Therefore, according to the present invention, damage to the drain groove body can be effectively prevented even if the wall thickness of the drain groove body is increased or is not equal.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a conventional transverse drain, Fig. 2 is a cross-sectional view of a first embodiment of the transverse drain of the present invention, and Fig.
The figure is an explanatory diagram, Figure 4 is a sectional view of the second embodiment, and Figure 5 is a sectional view of the second embodiment.
The figure is a sectional view of the third embodiment, and FIG. 6 is a partially omitted perspective view of the second embodiment. 7, 10... Drain main body, 8, 11... Cover plate,
8a, 11a...Both ends.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A drain main body with an open top surface and a cover plate covering the top opening of the drain main body, the drain main body crossing the road and the top surface of the cover plate. In a transverse drainage ditch that is buried in a road so as to be exposed on the ground surface, both ends of the cover in the road direction protrude from the ditch main body, and the protruding length L of both ends and the depth of the ditch main body are Ratio L/H
A transverse drainage ditch characterized by setting the angle to be larger than the tangent of the distribution angle of the earth pressure generated on the tip side of both sides. (2) A transverse drain according to claim 1 of the utility model registration claim, characterized in that protrusions are integrally formed on the lower surface of both ends of the lid projecting from the drain main body to be buried in the ground. . (3) The transverse drainage ditch according to claim 1, wherein a portion of both ends of the lid protruding from the drainage ditch main body are inclined so as to penetrate into the ground.