JP7109625B1 - Semi-flat culvert with L-shaped blocks - Google Patents

Abstract

[PROBLEMS] To form a semi-flat street culvert suitable for the environment of sidewalks and bicycle lanes at the border of sidewalks and roadways with steps. SOLUTION: A semi-flat street ditch suitable for sidewalks and bicycle lanes is provided by continuously laying L-shaped blocks molded to a constant length by a curb portion where overflow curbs and car stop curbs alternate and an apron. . [Selection drawing] Fig. 1

Description

TECHNICAL FIELD The present invention relates to a semi-flat culvert made of L-shaped blocks installed at the boundary between a roadway side strip and a stepped sidewalk.

The L-shaped blocks for precast concrete culverts have asphalt paving on the side of the apron and sidewalks on the curb side. Drain to the catchment basin along the road profile.

The sidewalk is in contact with the curb with a cross slope of about 1%, and the roadway with a semi-cylindrical cross section has a shoulder with a cross slope of about 2% and is in contact with the L-shaped drainage section, and the apron has a water flow cross section with a width of 50 cm and a slope of 6%.
In recent years, the Road Structure Ordinance has been enforced, which designates the side strip of the roadway as a bicycle lane. Asphalt pavement as a whole is required along with alleviation of sudden changes from the ground.

The conventional sidewalk width of 1m to 1.5m has now become a city planning road with wide sidewalks. .5m), etc., aiming to diversify the use of road space, and reconstructing it centered on pedestrians
The trend is to promote flexible use of wide sidewalks and bicycle lanes.

Japanese Patent Application Laid-Open No. 2003-253611 JP 2014-66057 A Japanese Patent Application Laid-Open No. 2017-31780 JP 2019-100166 A

Conventionally, in making sidewalks barrier-free, the standard height of the sidewalk surface from the roadway is set at 5 cm in the "Guidelines for smooth movement of roads" indicated by the government.
In a semi-flat street ditch with a 5 cm step boundary between the bottom of the apron and the higher sidewalk surface, the curbstone is installed 10 to 20 cm higher than the sidewalk surface as a car stop structure.
Since rainwater drainage on the sidewalk surface is blocked by continuous boundary curbs, rainwater is discharged to the apron only through the perforated openings provided for drainage.
In the utilization of road space, there is also a problem due to rainwater retention for a long time.
In addition, there is always the risk that a cyclist traveling in the shoulder lane along a continuous sidewalk boundary curb may be forced to avoid a parked vehicle ahead and enter the adjacent lane. Therefore, the need to improve safety by temporarily avoiding the sidewalk surface is also an issue.

The reduction in drainage capacity of semi-flat culverts due to the reduction in drainage cross-section when the slope of the apron is flattened from 6% to 2% is absorbed by shortening the installation interval of water collection basins along the road longitudinal slope. make up, but
In addition, in terms of utilization of road space, etc., it is required that rainwater drains quickly from the sidewalk surface and does not stay for a long time.

In order to solve the above-mentioned problems, the L-shaped block of the present invention makes the curb part coincide with the sidewalk surface, including the case where the apron slope is 6%, which is the same as for general streets, and 2% to match the bicycle lane. A drainage overflow curb that is low enough to allow bicycles to enter, and a curb that is higher than the curb on the sidewalk-vehicle boundary stand alternately from the apron surface.

In bicycle lanes, even if the L-shaped block apron width of 50 cm is reduced to 10 cm or the like and replaced with asphalt pavement, the water flow capacity of the L-shaped street culvert cross section with tractability is maintained.
Moreover,
In a street ditch with L-shaped blocks at the step boundary between a bicycle lane and a higher sidewalk surface,
Low overflow curbs and high curb curbs, whose continuous curbs match the sidewalk surface, are installed alternately for about 1m each, allowing rainwater on the sidewalk surface to overflow and drain to the apron in a continuous state along the road, and only for bicycles. It becomes possible when it is difficult to get on the sidewalk while driving.

The cross slope is close to 2% of the shoulder of the roadway from 6%, and even if the cross section of the L-shaped drainage section is reduced and the water flow capacity is reduced, the interval between the water collection basins is reduced and the side channel is opened with a slit at the bottom of the apron ditch. can also be satisfied by an L-shaped block containing the .

Overflow curbs and curb curbs alternate, and the curb curbs are formed at a height where passing vehicles cannot enter due to the continuous L-shaped culvert. It becomes a sufficient drop zone, is suitable for riding only by bicycle, and contributes to the utilization of sidewalk space.

In the bicycle lane along the pedestrian-vehicle boundary, where curbs and overflow curbs alternately continue, the intermittent pedestrian-vehicle boundary line catches the cyclist's line of sight and acts as an accent. Safety can be ensured even when temporarily riding on sidewalks while avoiding parked and stopped vehicles, creating a safe and comfortable bicycle lane.

FIG. 4 is a perspective view showing an embodiment of an L-shaped block; 2 is a cutaway slope view showing an embodiment in which a semi-flat culvert is formed along a bicycle lane by the L-shaped blocks shown in FIG. 1. FIG. FIG. 3 is a cross-sectional view taken along line A to A of FIG. 2; FIG. 4 is a perspective view showing an embodiment of an L-shaped block with a slit opening secondary channel. Fig. 5 is a cutaway slope view showing an embodiment in which a semi-flat culvert is formed along the bicycle lane by the L-shaped blocks shown in Fig. 4; FIG. 6 is a cross-sectional view taken along line BB of FIG. 5;

In general, the L-shaped block has a triangular water flow with an apron width of approximately 50 cm, a slope of 6% toward the bottom of the ditch, and an inner height of 3 cm. Substitute for asphalt pavement to form the culvert apron bottom.
For the semi-flat curb cross-section curb with the sidewalk, an overflow curb with a 5 cm step and a higher curb curb will be installed at a height of 10 to 20 cm from the sidewalk.
There are three types of road pavement stoppers, 15 cm, 20 cm, and 25 cm in thickness.
It is supplied with precast concrete with a length of 1 m, 2 m, etc., and is laid on the foundation with a fixed slope along the road longitudinal slope.

The L-shaped block with a secondary channel has a slit on the apron surface at the corner between the side of the curb stone and the bottom of the apron culvert, which opens toward the secondary channel directly below.
The sub-channel will be elliptical, circular, etc., and will be provided with an inner diameter width that spans from under the curb to the L-shaped apron, and the slit will directly connect to the sub-channel without passing under the curb.

The side channel that satisfies the drainage capacity of the street ditch has an inner diameter of 15 cm and an inner height of 10 to 15 cm or more, and the inner bottom height is lower than the top surface pavement.

FIG. 1 shows an embodiment of a long 2 m long L-shaped block (1) that integrates a curb (3) and an apron (2).
The curb portion consists of an overflow curb (3A) of 0.5 m at each end and a curb curb (3B) of 1 m in the center.
The apron (2) is 50 cm wide and reaches the pavement stop (7) at the side edge. In this embodiment, the curb stone (3B) is provided with a drain port (11).

Figure 2 shows an example of a semi-flat street ditch (10) along a bicycle lane (5) using the L-shaped block (1) shown in Figure 1, and an overflow curb (3A) with an inclined surface (4) and a car stop. A curbstone portion (3) is formed in which curbstones (3B) are alternately continued for 1 m.
The overflow curbstone (3A) is in a continuous state, and the rainwater runoff from the sidewalk (15) is sloped and drained to the apron (2) without retention, and bicycles can freely ride along the sidewalk (10). Become.
Since the width of the road for a bicycle to enter is continuous alternately between the curb stones (3B) and (3B), it is not possible for a four-wheeled vehicle or the like to enter.
The corners of the curb (3B) near the overflow curb (3A) are rounded and chamfered.
As shown in Figs. 1 and 2, the drain port (11) has its lower side aligned with the sidewalk surface, eliminating puddle on the sidewalk from the car stop curb (3B) and supplementing rainwater drainage from the overflow curb (3A). It is an example.

As shown in FIG. 3, which is a cross-sectional view along line A to A in FIG. It is formed on the optimal cross slope and asphalt paved surface for the bicycle lane (5).

FIG. 4 shows an embodiment of a 1 mL long block (1) with a built-in secondary channel and a slit opening of 15 mm.
The curb portion (3) has an overflow curb of 0.5 m in the center and a curb curb of 0.25 m at each end.
The apron (2) is 10 cm wide and reaches the pavement stop (7) at the side edge.
The secondary channel (20) opens towards the apron culvert bottom (25) by means of a slit (12).

Fig. 5 shows an embodiment in which the L-shaped block (1) shown in Fig. 4 is used to form a semi-flat culvert (10) along the bicycle lane (5).
A curb portion (3) is formed in which an overflow curb (3A) with an inclined surface (4) and a curb (3B) are alternately continued for 0.5 m.
The overflow curb (3A) is in a continuous state, and the rainwater runoff from the sidewalk (15) is drained to the apron (2) and the sub-channel (20) without retaining it, and to the bicycle sidewalk (15). Entry into the city will be free along the street culvert (10).
The width of the bicycle to enter while running is free because the overflow curb (3A) is 0.5m and the bottom width is 0.7m, and the curbs (3B) (3B) are alternately continuous. Four-wheeled vehicles, etc. cannot enter.
In addition, roundness and chamfering are given to the end face corner portion of the curb stone (3B) near the overflow curb stone (3A).
In this embodiment, the length of the curb stone (3B) is as small as 0.5 m and is alternately continued with the curb stone (3A), so that the sidewalk (15) that is in contact with the curb stone (3B) is covered with water. Accumulation is less likely to occur.

As shown in FIG. 6, which is also a cross-sectional view along line B-B in FIG. The width of the apron is reduced to 10 cm, and the optimal cross slope and asphalt paved surface are formed for the bicycle lane (5) instead of asphalt pavement.

The present invention can be applied in combination with conventional L-shaped blocks for general semi-flat streets, and there is no restriction in terms of popularization.
In addition, since conventional general products can be reused for the formwork, it can be produced and supplied at the same low cost as conventional concrete products for roads.

1 L-shaped block 2 Apron 3 Curb 3A Overflow curb 3B Car stop curb 4 Inclined surface 5 Bicycle lane 7 Pavement stop 8 Main pavement 9 Upper surface pavement 10 Street ditch 11 Drainage port 12 Slit 15 Sidewalk 16 Road shoulder 20 Side channel 25 Ditch Bottom 30 Base material 31 Bed mortar

Claims (2)

A semi-flat street ditch of L-shaped blocks that divides the boundary between a bicycle lane and a sidewalk with a higher step,
A semi that uses L-shaped blocks molded to a certain length with a curb and apron where overflow curbs and curb curbs alternate, and lays on the upper surface of the overflow curb at a height that matches the sidewalk surface. In the flat culvert,
The overflow curb stones are arranged in a continuous state along the bicycle lane at each interval of the car stop curb stones with a width that allows bicycle riding,
L characterized in that the overflow curb stone is continuous and drains rainwater runoff from the sidewalk to the apron without retaining it, and only traveling bicycles can freely enter the sidewalk along the street ditch. Semi-flat culvert with shaped blocks. A semi-flat street ditch of L-shaped blocks that divides the boundary between a bicycle lane and a sidewalk with a higher step,
The apron street has a built-in side channel that opens with a slit, and the apron and the curb where the overflow curb and car stop curb are alternately used continuously use L-shaped blocks molded to a fixed length to match the sidewalk surface. In a semi-flat street culvert laid on the upper surface of the overflow curb with a height of
The overflow curb stones are arranged in a continuous state along the bicycle lane at each interval of the car stop curb stones with a width that allows bicycle riding,
The overflow curb stone is continuous, and rainwater runoff from the sidewalk is not retained, and along with the inclined drainage to the apron and the drop drainage from the slit to the secondary waterway, only the running bicycle can ride on the sidewalk along the street ditch. A semi-flat culvert with L-shaped blocks, characterized in that it is free to

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