JP6156844B2 - Apron block and apron - Google Patents

Description

  The present invention relates to a roundabout apron that is easy to construct and remove. In particular, the invention is suitable for a roundabout apron block and apron used in social experiments that require construction, setting changes, removal, and the like.

  As an effort to improve road services, a roundabout social experiment was conducted in Karuizawa in 2012 by the Ministry of Land, Infrastructure, Transport and Tourism Road Bureau.

  “Roundabout” is a type of circular intersection in which a circular central island 100 is provided at the center of the intersection as shown in FIG. 30, and an annular ring road 101 is formed along the circumferential direction of the central island 100. The inside of the ring road 101 is one-way, and the traffic flow of the ring road 101 is not interrupted by a signal or a temporary stop. An apron 102 is provided between the central island 100 and the ring road 101 for suppressing vehicle speed and preventing shortcuts. In addition, a separation island 103 is provided on the road that intersects with the ring road 101, and the joining portion is partitioned into an inflow portion 104 and an outflow portion 105 of the vehicle.

  It is expected that the number of local governments and road managers considering introduction based on social experiments will be increased in the future in order to clarify the application effects and problems of roundabout after the revision of the road traffic law related to roundabout.

  In the above Karuizawa experiment, a heavy pedestrian boundary block was installed on the central island 100, and a part called an apron 102 was visually treated with a lane marking.

  Here, in order to increase the vehicle speed suppression effect and the shortcut prevention effect, it is desirable to make the apron 102 higher than the ring road 101. However, if the apron 102 is made higher than the ring road 101, the apron 102 may be covered with snow in the snowfall area and may be damaged by contact with the snowboard (plow, blade, etc.) of the snowplow. There is a risk that it may interfere with snow removal using a snowplow.

  Furthermore, social experiments are often performed for a fixed period of time, and when the apron 102 is configured using actual blocks, it is desired to make the material light and strong so that it can be removed after the social experiment is completed. It was.

  On the other hand, there has been one described in Patent Document 1 as a road separation band block. According to this, the buried anchor is disposed on the road surface side, and the road separation band block is formed in a quadrangular frustum shape that becomes narrower toward the upper side. The road separation band block is provided with through holes that can communicate with the embedded anchors in the vertical direction. The through holes are bolted through the through holes and coupled to the embedded anchors so as to be detachable from the road surface.

JP 2002-188126 A

  However, the above-mentioned road separator block is used for the central separator and has a quadrangular pyramid shape, so it cannot be applied as it is to a roundabout that is an annular intersection, and construction and maintenance are difficult. Met.

  In view of the above circumstances, an object of the present invention is to provide an apron block and an apron that can be applied to a roundabout and can be easily constructed and maintained.

The invention according to claim 1 is an apron block constituting a substantially annular apron installed between the central island of the roundabout and the ring road,
The apron block
The apron is formed in a shape that is divided along the circumferential direction, and in a plan view, the side that is the inner peripheral side of the apron is formed in a substantially trapezoidal shape that is shorter than the side that is the outer peripheral side of the apron, and bolts are inserted. Mounting holes
The upper surface is formed in a shape corresponding to the lower surface of the apron block arranged on the upper side when the apron block is overlapped in the vertical direction,
The lower surface is formed in a shape corresponding to the upper surface of the apron block arranged on the lower side when the apron block is overlapped in the vertical direction,
An apron is formed by connecting a plurality of blocks for the apron along the circumferential direction of the apron,
The bolt inserted into the mounting hole is installed at the installation location by screwing with a buried anchor disposed at the installation location.

According to this, the apron block is formed in a substantially trapezoidal shape in which the apron is divided along the circumferential direction, and the side on the inner peripheral side of the apron is shorter than the side on the outer peripheral side of the apron. It is possible to easily construct an annular apron by providing a line along the circumferential direction. Further, the bolt is inserted into the mounting hole, and the embedded anchor and the bolt are screwed together or released from the installation place, thereby being detachable from the installation place. Therefore, construction and maintenance are easy, and an apron block suitable for roundabout can be provided. Also, when the apron blocks are stacked in the vertical direction, the apron blocks adjacent to each other in the vertical direction have shapes corresponding to the upper and lower surfaces, so the apron height can be easily increased stepwise. It becomes possible to do.

  According to the second aspect of the present invention, the occlusal portion is disposed at one end of the apron in the circumferential direction, and the apron is adjacent to the other end in the apron circumferential direction. An occluded portion that engages with the occlusal portion of the block is disposed.

  According to this, by engaging the occlusal part of the adjacent apron block and the part to be occluded, it is possible to prevent the adjacent apron blocks from being displaced and to stabilize the installation state.

  In the invention according to claim 3, the first gap forming portion is disposed at the end portion on one end side in the circumferential direction of the apron, and the end portion on the other end side in the circumferential direction of the apron, When the second gap forming portion is disposed and the apron block is continuously provided along the apron circumferential direction, the second gap of the apron block adjacent to the first gap forming portion is provided. A gap is formed between the forming portion and a connecting member for connecting adjacent apron blocks can be fitted into the gap.

  According to this, it adjoins by inserting the connection member which connects the block for adjacent aprons in the clearance gap formed by the 1st clearance gap formation part of the block for adjacent apron, and the 2nd clearance gap formation part. The installation state can be stabilized by preventing the blocks for the apron from shifting.

According to the fourth aspect of the present invention, if an upper slip prevention portion having a slip prevention function is provided on at least a part of the upper surface, the upper slip prevention portion even if a large vehicle rides on the upper surface of the apron block. Thus, slipping can be suppressed and traveling performance can be improved.

If the lower slip prevention part which has a slip prevention function is arrange | positioned in at least one part of the lower surface like invention of Claim 5, it can suppress that the block for apron slides in an installation place.

According to the sixth and seventh aspects of the present invention, at least a part of the upper surface is provided with an anti-slip part having an anti-slip function, and at least a part of the lower surface is provided with a lower anti-slip part having an anti-slip function. When the apron block is overlapped in the vertical direction, the lower slip prevention portion of the apron block disposed on the upper side can come into contact with the upper slip prevention portion of the apron block disposed on the lower side. Yes.

  According to this, in addition to the anti-slip effect on the upper surface and the lower surface, when the apron block is overlapped in the vertical direction, at least a part of the lower anti-slip portion of the apron block arranged on the upper side and the lower side Since it is possible to prevent the apron blocks from sliding on each other due to contact with the upper slip prevention portion of the apron block to be arranged, this contributes to stabilizing the installation state.

  As in the eighth aspect of the invention, the road surface marking portion is provided on the end surface on the outer peripheral edge side of the apron. In roundabout, traffic flow in the roadway is not interrupted by traffic lights, temporary stops, etc., so it is possible to suppress accidents by alerting the apron to the presence of the apron.

  According to the ninth aspect of the present invention, if the road surface marking portion is formed by sticking a reflective sheet to the end surface on the outer peripheral edge side of the apron, or by applying paint, the reflected light from the reflective sheet, Visibility can be enhanced by color.

In the invention of claim 10, the apron's outer peripheral edge side is 785 mm, and the angle formed by the apron's outer peripheral edge side and the apron's peripheral edge side edges has been with it respectively 8 7.2 °.

According to this, it is possible to form an apron having an outer diameter of 18 m and a pitch angle of 5 ° formed by connecting the sides on both ends in the circumferential direction of the apron and the center of the apron with a virtual line. Become. Further, it is possible to form an apron having an outer diameter of 16 m and a pitch angle of about 5.6 ° formed by connecting the sides on both ends in the circumferential direction of the apron and the center of the apron with an imaginary line. Become. Therefore, the outer diameter of the apron can be changed by increasing or decreasing the apron block.

In the invention according to claim 11, the side which becomes the outer peripheral edge side of the apron is 628 mm, and the angle formed by the side which becomes the outer peripheral edge side of the apron and the side which becomes both end sides in the circumferential direction of the apron. has been with it respectively 8 7.7 °.

According to this, it is possible to form an apron having an outer diameter of 18 m and a pitch angle of 4 ° formed by connecting the sides on both ends in the circumferential direction of the apron and the center of the apron with a virtual line. Become. Further, the pitch angle formed by connecting the sides on both ends in the circumferential direction of the apron and the center of the apron with a virtual line is 4 . An apron having an outer diameter of 16 m that is set to 5 ° can be formed.

  The invention according to claim 12 is a substantially annular apron installed between the central island of the roundabout and the ring road, wherein the apron block according to any one of claims 1 to 11 is an apron. Are formed continuously along the direction of the circumferential direction.

  According to this, the merit by unifying the specification of the block for aprons generate | occur | produces, and development, manufacture, work, and management cost can be reduced.

  According to a thirteenth aspect of the present invention, the apron includes a substantially annular outer ring portion and a substantially annular inner ring portion located inside the outer ring portion, and the outer ring portion includes a plurality of the outer ring portions. The apron block according to any one of claims 1 to 11, and the inner ring portion is formed from the apron block according to any one of claims 1 to 11.

  According to this, it becomes possible to increase the width of the apron, and it is possible to cope with the environment of the installation place where large vehicles often pass and ride on the apron.

  According to a fourteenth aspect of the present invention, the apron block according to the third aspect is formed continuously along the apron circumferential direction, and the apron block adjacent to the first gap forming portion is formed. A gap is formed between the two gap forming portions, a connecting member is fitted into the gap, and adjacent apron blocks are connected to each other.

  Even with such a configuration, it is possible to prevent the adjacent apron blocks from being displaced and to stabilize the installation state.

As in the invention described in claim 15, the apron is formed by continuously forming the apron block according to claim 1 or 7 along the direction which is the circumferential direction of the apron, and is overlapped in the vertical direction. Then, the apron height can be increased step by step.

It is a top view which shows the state in which the apron of 1st embodiment in this invention was installed. FIG. 2 is a partially enlarged plan view of a round part in FIG. 1. It is a top view of the block for apron. It is a bottom view of the block for apron. It is the partially broken side view of the block for aprons seen from the circumferential direction of the apron. It is a side view at the time of overlapping the block for aprons seen from the outer periphery side of the apron. It is a top view which shows the state in which the apron of 2nd embodiment in this invention was installed. FIG. 2 is a partially enlarged plan view of a round part in FIG. 1. It is a top view of the block for apron. It is a bottom view of the block for apron. It is a side view at the time of overlapping the block for aprons seen from the outer periphery side of the apron. It is a top view which shows the state in which the apron of 3rd embodiment in this invention was installed. FIG. 2 is a partially enlarged plan view of a round part in FIG. 1. It is a top view of the block for apron. It is a bottom view of the block for apron. (A) of a connection member is a top view, (b) is a side view. It is a side view at the time of overlapping the block for aprons seen from the outer periphery side of the apron. It is a top view which shows the state in which the apron of 4th embodiment in this invention was installed. FIG. 2 is a partially enlarged plan view of a round part in FIG. 1. It is a top view of the block for apron. It is a bottom view of the block for apron. It is a side view at the time of overlapping the block for aprons seen from the outer periphery side of the apron. It is a top view of the modification of an upper slip prevention part. It is a bottom view of the modification of a lower slip prevention part. It is a top view of the modification of an upper slip prevention part. It is a bottom view of the modification of a lower slip prevention part. It is a top view of the modification of an upper slip prevention part. It is a bottom view of the modification of a lower slip prevention part. It is a top view which shows the apron formed by installing the block for apron in single. It is explanatory drawing of a roundabout.

  A first embodiment of an apron in the present invention will be described with reference to the drawings.

  The apron 10 is formed in a substantially annular shape as shown in FIGS. 1 and 2, and is installed between the central island 100 and the ring road 101 of the roundabout. The apron 10 includes a substantially annular outer ring portion 11 and a substantially annular inner ring portion 12 positioned inside the outer ring portion 11. The outer ring portion 11 is formed by connecting a plurality of apron blocks 20 along a direction that is the circumferential direction of the apron 10, and the inner ring portion 12 is formed by connecting the plurality of apron blocks 20 to the circumferential direction of the apron 10. It is formed in a row along the direction. In the present embodiment, the apron 10 has a diameter of 18 m.

  As shown in FIGS. 1 to 6, the apron block 20 is formed in a shape obtained by dividing the annular apron 10 into the same shape along the circumferential direction. The apron block 20 is made of a synthetic resin and has a substantially trapezoidal flat plate shape, and is formed in a substantially trapezoidal shape in which the side S1 on the inner peripheral side of the apron 10 is shorter than the side S2 on the outer peripheral side of the apron 10 in plan view. Yes.

  The apron block 20 has angles θ1 and θ2 formed by a side S2 which is the outer peripheral side of the apron 10 and sides S3 and S4 which are both ends in the circumferential direction of the apron 10, and each of the angles θ1 and θ2 is a circle having a diameter of 16 m. The side S2 which is the outer peripheral edge side of the apron 10 having a length substantially equal to the length of the circumference divided by N, the side S2 which is the outer peripheral edge side of the apron 10, and both end sides in the circumferential direction of the apron 10 The angles formed by the sides S3 and S4 are substantially the same as the angle θ calculated by (180 ° -360 ° / N) / 2. The sides S3 and S4 are formed to have the same length.

  In the present embodiment, the side S1 on the inner peripheral side of the apron 10 is 550 mm, the side S2 on the outer peripheral side of the apron 10 is 628 mm, the length (height) in the radial direction of the apron 10 is 990 mm, and the thickness in the vertical direction is The angles θ1 and θ2 are about 87.7 °, respectively. The apron block 20 is composed of 90 pieces of the outer ring portion 11 and 80 pieces of the inner ring portion 12.

  As shown in FIG. 2, the apron block 20 has an occlusal portion 21 at an end portion on the rear side in the clockwise direction of the apron 10 (an end portion on one end side in the apron circumferential direction in the claims). The apron block is adjacent to the end of the apron 10 in the clockwise direction (the end on the other end in the circumferential direction of the apron in the claims) in the circumferential direction of the apron 10 An occlusal portion 22 that engages with 20 occlusal portions 21 is provided.

  In this embodiment, as shown in FIGS. 2 to 4, the occlusal portion 21 is formed in a trapezoidal plate shape in which the end portion on the front side in the clockwise direction is shorter than the end portion on the rear side in the clockwise direction, and on the rear side in the clockwise direction. It protrudes.

  As shown in FIGS. 2 to 4, the to-be-occluded portion 22 is formed by notching a trapezoidal shape corresponding to the occlusal portion 21, wherein the end on the front side in the clockwise direction is shorter than the end on the rear side in the clockwise direction. Yes. That is, the occluded portion 22 is formed such that the end on the entrance side (front side in the clockwise direction) is narrower than the back side (back side in the clockwise direction).

  Since the occlusal portion 21 and the occluded portion 22 are engaged with each other, the apron blocks 20 adjacent in the circumferential direction of the apron 10 are prevented from separating.

  On the upper surface 23 of the apron block 20, an upper slip prevention portion 24 having a slip prevention function is disposed. In the present embodiment, as shown in FIGS. 3 and 6, the upper non-slip portion 24 has a substantially trapezoidal shape in which the cross-sectional shape is short on the side away from the upper surface 23 of the apron block 20 and the upper surface 23 of the apron block 20. The central protrusion 24a is formed so as to extend along the line C connecting the intermediate point of the side S1 on the inner peripheral edge side of the apron 10 and the intermediate point of the side S2 on the outer peripheral edge side of the apron 10. And side protrusions 24b and 24c formed so as to be parallel to the central protrusion 24a.

  On the lower surface 25 of the apron block 20, a lower slip prevention portion 26 having a slip prevention function is disposed. In the present embodiment, as shown in FIGS. 4 and 6, the lower anti-slip portion 26 includes an intermediate point of the side S <b> 1 that is the inner peripheral side of the apron 10 and a side that is the outer peripheral side of the apron 10. Along the line C connecting the intermediate point of S2, from the lower surface 25 to the upper surface 23, a substantially trapezoidal central bottomed groove 26a corresponding to the central protrusion 24a, and parallel to the central bottomed groove 26a And is formed of substantially trapezoidal side-bottomed grooves 26b and 26c corresponding to the side protrusions 24b and 24c.

  As shown in FIG. 6, when the apron block 20 is overlapped in the vertical direction, the central bottomed groove 26a, the side bottomed groove 26b as the upper slip prevention part 24 of the apron block 20 disposed on the lower side, 26c and the central protrusion 24a and the side protrusions 24b, 24c serving as the lower slip prevention portions 26 of the apron block 20 arranged on the upper side are engaged with each other, and the apron blocks 20 adjacent in the vertical direction slide between each other. It can be prevented from moving.

  On the end surface 27 on the outer peripheral side of the apron 10 of the apron block 20 is provided with a road surface marking portion 28 on which a sign for informing the driver, pedestrian, etc. of the presence of the apron 10 is provided. In the present embodiment, as shown by the shaded portion in FIG. 6, a reflection sheet that forms the road marking portion 28 is attached to the end surface 27.

  The apron block 20 has a mounting hole 29. The attachment hole 29 is formed as a stepped through hole having a larger diameter on the upper surface 23 side and a smaller diameter on the lower surface 25 side than the upper surface 23 side.

  By connecting the mounting hole 29 and the cylindrical embedded anchor 31 embedded in the installation location G and inserting the bolt 30 into the mounting hole 29, the bolt 30 and the embedded anchor 31 are screwed together, so that the apron The work block 20 is installed at the installation location G.

  Next, the construction method of the apron 10 will be described. An embedded anchor 31 is embedded in the installation location G in advance at a location corresponding to the mounting hole 29 of the apron block 20. The apron block 20 is continuously provided along the circumferential direction of the apron 10 to form the annular apron 10.

  At this time, the occlusal portion 21 and the occluded portion 22 of the apron block 20 adjacent in the circumferential direction of the apron 10 are engaged to form the annular outer ring portion 11. Then, as shown in FIG. 1, the inner ring portion 12 is formed inside the outer ring portion 11 by the same process as the outer ring portion 11.

  Further, as shown in FIG. 2, between the outer peripheral edge portion of the inner ring portion 12 and the inner peripheral edge portion of the outer ring portion 11, and on the inner peripheral edge portion side between the apron blocks 20 adjacent in the outer ring portion 11. There is a gap, but it is about 10 to 14 mm between the outer peripheral edge portion of the inner ring portion 12 and the inner peripheral edge portion of the outer ring portion 11, and on the inner peripheral edge side between the apron blocks 20 adjacent in the outer ring portion 11. It is about 9 mm and is not large enough for a vehicle tire to enter.

  As shown in FIG. 5, the mounting hole 29 and the cylindrical embedded anchor 31 embedded in the installation place G are communicated, and after the bolt 30 is inserted into the mounting hole 29, the bolt 30 and the embedded anchor 31 are connected. The apron block 20 is fixed to the installation place G by screwing.

  When removing the apron 10 for maintenance, snow removal, etc., release the screwing between the bolt 30 and the embedded anchor 31 and release the occlusion between the occlusal portion 21 and the occluded portion 22 of the adjacent apron block 20. Then, the apron block 20 is separated, and each apron block 20 is removed.

  In addition, when the height of the apron 10 is increased, as shown in FIG. 6, the apron block 20 is superposed in the vertical direction. A central protrusion 24a and side protrusions 24b and 24c of the apron block 20 disposed on the lower side, and a central bottomed groove 26a and side bottomed grooves 26b and 26c of the apron block 20 disposed on the upper side, respectively. The attachment hole 29 of the apron block 20 disposed on the lower side is in communication with the attachment hole 29 of the apron block 20 disposed on the upper side. Then, the bolt 30 and the embedded anchor 31 are used by using the bolt 30 having a length obtained by adding the thickness of the apron block 20 to the length of the bolt 30 used when the apron block 20 is not overlapped in the vertical direction. And the apron block 20 is fixed to the installation place G.

  In this configuration, the central bottom groove 26a and the side bottom grooves 26b and 26c of the apron block 20 disposed on the upper side, the central protrusion 24a and the side protrusion 24b of the apron block 20 disposed on the lower side, 24c are engaged with each other to prevent the adjacent apron blocks 20 from sliding in the vertical direction.

  Since the outer diameter of the apron 10 is preferably 16 m or 18 m, the setting of the size and the number of the apron blocks 20 in that case will be described. The apron 10 has a substantially annular shape, but it will be described as an annular shape for the sake of simplicity. In the following description, the length of the side S2 on the outer peripheral edge side of the apron 10 is denoted by l.

  When N apron blocks 20 are arranged, an apron 10 having an outer diameter of 16 m is formed. When N + n aprons 20 are arranged, an apron 10 having an outer diameter of 18 m is formed.

  Further, the number N of the apron blocks 20 when the outer periphery of the apron 10 having an outer diameter of 16 m is equally divided by l is calculated by 16π / l = N. Also, l = 16π / N.

  The number N + n of apron blocks 20 when the outer periphery of the apron 10 having an outer diameter of 18 m is equally divided by the side l is calculated as 18π / l = N + n.

  The difference in outer peripheral length between the inner ring portion 12 and the outer ring portion 11 is 2π, and that portion is 2π = nl. Since l can be expressed by 16π / N, nl is 2π = n × 16π / N. When deformed, n = N / 8, N is a multiple of 8, and when N + N / 8 are arranged, a circle with a diameter of 18 m is formed.

  In the present embodiment, the inner ring portion 12 has an outer diameter of 16 m and is formed of 80 apron blocks 20 that are multiples of 8. Therefore, the pitch angle P2 formed by connecting the sides S3 and S4 which are both ends in the circumferential direction of the apron 10 and the center O of the apron 10 with a virtual line is about 4.5 °. Further, the length l of the side S2 on the outer peripheral edge side of the apron 10 of the apron block 20 is 628 mm.

  The outer ring portion 11 has an outer diameter set to 18 m and is formed of 90 apron blocks 20 of 80 pieces + 10 (= 80/8) pieces. A pitch angle P1 formed by connecting sides S3, S4 on both ends in the circumferential direction of the apron 10 and the center O of the apron 10 with a virtual line is about 4 °. Note that the length of the side S1 on the inner peripheral side of the apron 10 is such that 80 apron blocks 20 are arranged in the inner ring portion 12 and 90 apron blocks 20 are arranged in the outer ring portion 11, so that l × 80 ÷ 90≈558 or less. And Here, it is set to 550 mm.

  Theoretically, the apron block 20 includes 81 outer ring portions 11 and 72 inner ring portions 12, or the apron block includes 63 outer ring portions 11 and 56 inner ring portions 12. It is also possible to form the block 20.

  However, if the outer ring portion 11 is formed with an odd number of apron blocks 20, the positions of the apron block 20 that forms the inner ring portion 12 and the apron block 20 that forms the outer ring portion 11 are difficult to align. Work efficiency will drop.

  Further, when the outer ring portion 11 is formed with 63 apron blocks 20 and the inner ring portion 12 is formed with 56 apron blocks 20, the size of one apron block 20 is increased, so that work efficiency is reduced. It becomes a cause to do.

  The apron block 20 having the above-described configuration is an apron block that constitutes a substantially annular apron 10 installed between the central island 100 and the ring road 101 of the roundabout. The apron block 20 includes the apron 10. It is formed in a shape divided along the circumferential direction, and in a plan view, the side S1 that is the inner peripheral edge side of the apron 10 is formed in a substantially trapezoidal shape that is shorter than the side S2 that is the outer peripheral edge side of the apron 10, and the bolt 30 The apron 10 is formed by connecting a plurality of the apron blocks 20 along the circumferential direction of the apron 10, and the bolts 30 inserted into the mounting holes 29. Is installed at the installation location G by screwing with the embedded anchor 31 disposed at the installation location G.

  According to this, the apron block 20 divides the apron 10 along the circumferential direction, and the side S1 that is the inner peripheral side of the apron 10 is formed in a substantially trapezoidal shape that is shorter than the side S2 that is the outer peripheral side of the apron 10. Therefore, the annular apron 10 can be easily constructed by connecting the apron 10 along the circumferential direction. Further, the bolts 30 are inserted into the mounting holes 29 so that the embedded anchors 31 and the bolts 30 are screwed together or released from the installation place G. Therefore, construction and maintenance are easy, and an apron block suitable for roundabout can be provided.

  Further, an occlusal portion 21 is disposed at one end of the apron 10 in the circumferential direction, and the apron block 20 is adjacent to the other end of the apron 10 in the circumferential direction. An occlusal portion 22 that engages with the occlusal portion 21 is disposed.

  According to this, by engaging the occlusal portion 21 of the adjacent apron block 20 and the occluded portion 22, it is possible to prevent the adjacent apron blocks 20 from being displaced and to stabilize the installation state. .

  The upper surface 23 is formed in a shape corresponding to the lower surface 25 of the apron block 20 disposed on the upper side when the apron block 20 is overlapped in the vertical direction, and the lower surface 25 is formed of the apron block 20. It is formed in a shape corresponding to the upper surface 23 of the apron block 20 that is disposed on the lower side when they are superposed in the vertical direction.

  According to this, when the apron block 20 is overlapped in the vertical direction, the apron 10 that is adjacent to the apron block 20 in the vertical direction has a shape corresponding to the upper surface 23 and the lower surface 25 facing each other. It is possible to increase the height of the step by step.

  Further, at least a part of the upper surface 23 is provided with an anti-slip portion 24 having an anti-slip function, and at least a portion of the lower surface 25 is provided with a lower anti-slip portion 26 having a function. When the two are stacked in the vertical direction, the lower slip prevention portion 26 of the apron block 20 disposed on the upper side can come into contact with the upper slip prevention portion 24 of the apron block 20 disposed on the lower side. .

  According to this, even if a large vehicle rides on the upper surface 23 of the apron block 20, the upper slip prevention portion 24 can suppress slipping and improve traveling performance. Further, the lower slip prevention portion 26 can prevent the apron block 20 from sliding at the installation location G.

  Further, when the apron block 20 is overlapped in the vertical direction, at least a part of the lower slip prevention portion 26 of the apron block 20 arranged on the upper side and the upper slip prevention of the apron block 20 arranged on the lower side It is possible to prevent the apron blocks 20 from sliding with each other due to contact with the portion 24, which contributes to stabilizing the installation state.

  Further, a road marking portion 28 is provided on the end surface 27 on the outer peripheral edge side of the apron 10. In the roundabout, the traffic flow of the ring road 101 is not interrupted by a traffic light, a temporary stop, or the like, so the road marking unit 28 can alert the presence of the apron 10 to suppress the accident.

  Moreover, since the road surface marking part 28 is formed by sticking a reflection sheet to the end face 27 on the outer peripheral edge side of the apron 10, the visibility can be enhanced by the reflected light from the reflection sheet.

  Further, the side S2 on the outer peripheral edge side of the apron 10 is about 628 mm, and is composed of a side S2 on the outer peripheral edge side of the apron 10 and sides S3 and S4 on both ends in the circumferential direction of the apron 10. The angles θ1 and θ2 are about 87.7 °, respectively.

  According to this, the outer diameter in which the pitch angle P1 formed by connecting the sides S3 and S4 which are both ends in the circumferential direction of the apron 10 and the center O of the apron 10 with a virtual line is about 4 °. Can form an apron 10 of 18 m. In addition, the outer diameter of the pitch angle P2 formed by connecting the sides S3 and S4 on both ends in the circumferential direction of the apron 10 and the center O of the apron 10 with a virtual line is about 4.5 °. The apron 10 or the inner ring part 12 of 16 m can be formed. Therefore, the outer diameter of the apron 10 can be changed by increasing or decreasing the apron block 20.

  Furthermore, since the outer ring portion 11 is formed of 90 pieces and the inner ring portion 12 is formed of an even number of apron blocks 20, the apron forming the inner ring portion 12 is formed at four locations on the outer periphery of the apron 10. The positions of the work block 20 and the apron block 20 forming the outer ring portion 11 are aligned, which contributes to improving the workability of construction work.

  The apron 10 is a substantially annular apron installed between the central island 100 and the ring road 101 of the roundabout, and a plurality of apron blocks 20 are arranged in a line along the circumferential direction of the apron 10. Has been formed.

  The apron 10 includes a substantially annular outer ring portion 11 and a substantially annular inner ring portion 12 positioned inside the outer ring portion 11, and the outer ring portion 11 includes a plurality of apron blocks 20. The inner ring portion 12 is formed by a plurality of apron blocks 20, so that the width of the apron 10 can be increased, and a large vehicle can pass and ride on the apron 10. It can cope with the environment of many installation locations G.

  Further, if the apron block 20 is formed so as to overlap in the vertical direction, the height of the apron 10 can be increased stepwise.

  Since the apron 10 uses the apron block 20, the apron 10 or the inner ring portion 12 having outer diameters of 18 m and 16 m can be formed by increasing or decreasing the apron block 20. Furthermore, the merit by unifying the standard of the apron block 20 occurs, and the development, manufacturing, work, and management costs can be reduced.

  A second embodiment of the present invention will be described. In the following description, the same components as those of the first embodiment are denoted by the same reference numerals, and the description of all or a part thereof is omitted.

  The apron 10A uses an apron block 20A. The apron block 20A has a side S1 on the inner peripheral side of the apron 10A of 687 mm, a side S2 on the outer peripheral side of the apron 10A, 785 mm, the length (height) in the radial direction of the apron 10A is 990 mm, and the thickness in the vertical direction. Is 20 mm, and the angles θ1 and θ2 are each about 87.2 °. 72 apron blocks 20A and 72 inner ring portions 12 and 64 inner ring portions 12 are formed.

  As shown in FIGS. 7 to 11, the apron block 20 </ b> A is engaged with the end portion on the rear side in the clockwise direction of the apron 10 </ b> A (the end portion on one end side in the apron circumferential direction in the claims). An apron in which the portion 21A is disposed and which is adjacent to the end portion on the front side in the clockwise direction of the apron 10A (the end portion on the other end side in the circumferential direction of the apron in the claims) in the circumferential direction of the apron 10A An occlusal portion 22A that engages with the occlusal portion 21A of the block 20A is disposed.

  In the present embodiment, as shown in FIGS. 8 to 10, the occlusal portion 21A has an end on the front side in the clockwise direction on the side of the apron block 20 on the outer peripheral edge side of the apron 10A. A convex portion 21A1 that is formed in a shorter trapezoidal flat plate shape and protrudes rearward in the clockwise direction, and a convex portion 22A2 of the occlusal portion 22A described later on the side that is the inner peripheral side of the apron 10A of the apron block 20 Corresponding concave portion 21A2 formed by notching a trapezoidal shape in which the end portion on the rear side in the clockwise direction is shorter than the end portion on the front side in the clockwise direction.

  In this embodiment, as shown in FIGS. 8 to 10, the occlusal portion 22 </ b> A is a front side in the clockwise direction corresponding to the convex portion 21 </ b> A <b> 1 of the occlusal portion 21 </ b> A on the side of the apron 10 </ b> A on the outer peripheral side of the apron block 20 </ b> A. On the side that is the inner peripheral side of the apron 10A of the apron block 20 on the side of the concave portion 22A1 that is cut out in a trapezoidal shape whose end side is shorter than the end on the rear side in the clockwise direction, The end portion is formed in a trapezoidal flat plate shape shorter than the end portion on the front side in the clockwise direction, and includes a convex portion 22A2 protruding to the front side in the clockwise direction.

  The protrusions 21A1 and the recesses 22A1 and the recesses 21A2 and the protrusions 22A2 are engaged with each other, thereby preventing the apron blocks 20A adjacent in the circumferential direction of the apron 10A from being separated.

  On the upper surface 23 of the apron block 20A, an upper slip prevention portion 24A having a slip prevention function is disposed.

  In the present embodiment, as shown in FIGS. 9 and 11, the upper non-slip portion 24 </ b> A has a substantially trapezoidal shape with a short end portion on the side away from the upper surface 23 of the apron block 20 </ b> A and the upper surface 23 of the apron block 20 </ b> A. A central projection 24A1 that protrudes upward from the center and is formed so that an intermediate point of the side S1 that is the inner peripheral edge side of the apron 10A and an intermediate point of the side S2 that is the outer peripheral edge side of the apron 10A are along C The side projections 24A2 and 24A3 are formed so as to be parallel to the sides S3 and S4 on both ends in the direction of the 10A circumferential direction. The side protrusions 24A2 and 24A3 are arranged such that the side of the apron block 20A on the outer peripheral side of the apron 10A expands with respect to the central protrusion 24A1.

  On the lower surface 25 of the apron block 20A, a lower slip prevention portion 26A having a slip prevention function is disposed. In this embodiment, as shown in FIGS. 10 and 11, the lower anti-slip portion 26 </ b> A includes an intermediate point of the side S <b> 1 that is the inner peripheral side of the apron 10 </ b> A and a side that is the outer peripheral side of the apron 10 </ b> A. Along the line C connecting the intermediate point of S2, from the lower surface 25 to the upper surface 23, a substantially trapezoidal central bottomed groove 26A1 corresponding to the central protrusion 24A1, and both ends in the circumferential direction of the apron 10A The side bottom grooves 26A2 and 26A3 are formed so as to be parallel to the sides S3 and S4, respectively, and have substantially trapezoidal side bottom grooves 26A2 and 26A3 corresponding to the side protrusions 24A2 and 24A3. The side-bottomed grooves 26A2 and 26A3 are arranged so that the side of the apron 10A of the apron block 20A on the outer peripheral side becomes wider than the central bottomed groove 26A1.

  The central projection 24A1 and the side projections 24A2 and 24A3 projecting from the upper surface 23 of the apron block 20A can suppress slippage due to contact with the tires of the vehicle, thereby improving running performance. Further, the corner portion formed with the lower surface 25 of the apron block 20A serves as an edge by the central bottom groove 26A1 and the side bottom grooves 26A2 and 26A3, and the apron block 20A slides at the installation location G. Can be suppressed.

  Further, as shown in FIG. 11, when the apron block 20 is overlapped in the vertical direction, the central projection 24A1, the side projections 24A2 and 24A3 of the apron block 20 arranged on the lower side, and the upper side are arranged on the upper side. The central bottom groove 26A1 and the side bottom grooves 26A2 and 26A3 of the apron block 20A to be engaged with each other engage with each other to prevent the adjacent apron blocks 20A from sliding in the vertical direction.

  The apron 10A is constructed in the same manner as the apron 10 except that the convex portion 21A1 of the occlusal portion 21A and the concave portion 22A1 of the occluded portion 22A, and the concave portion 21A2 of the occlusal portion 21A and the convex portion 22A2 of the occluded portion 22A are engaged. It is.

  Also, as shown in FIG. 8, between the outer peripheral edge of the inner ring portion 12 and the inner peripheral edge of the outer ring portion 11, and on the inner peripheral edge side of the apron blocks 20 </ b> A adjacent in the outer ring portion 11. There is a gap, but it is about 7 to 13 mm between the outer peripheral edge portion of the inner ring portion 12 and the inner peripheral edge portion of the outer ring portion 11, and on the inner peripheral edge side between the apron blocks 20A adjacent to each other in the outer ring portion 11. It is about 11 mm and is not large enough for a vehicle tire to enter.

  Further, when the height of the apron 10A is increased, as shown in FIG. 11, the apron block 20A is superposed in the vertical direction.

  In this configuration, the central bottomed groove 26A1 and the central protrusion 24A1, the side bottomed groove 26A2 and the side protrusion 24A2, the side bottomed groove 26A3 and the side protrusion 24A3 are engaged, and the apron adjacent in the vertical direction is engaged. The sliding of the blocks 20 for use is prevented.

  The setting of the size and the number of the apron block 20A will be described.

  In the present embodiment, the inner ring portion 12 has an outer diameter set to 16 m and is formed of 64 apron blocks 20A that are multiples of 8. Therefore, the pitch angle P2 formed by connecting the sides S3 and S4 on both ends in the circumferential direction of the apron 10A and the center O of the apron 10A with an imaginary line is about 5.6 °. Further, the length l of the side S2 on the outer peripheral edge side of the apron 10A of the apron block 20A is 785 mm.

  The outer ring portion 11 has an outer diameter set to 18 m, and is formed of 72 apron blocks 20 </ b> A of 64 + 8 (= 64/8). A pitch angle P1 formed by connecting sides S3, S4 on both ends in the circumferential direction of the apron 10A and the center O of the apron 10A with a virtual line is about 5 °.

  Construction and maintenance can be facilitated also by the apron 10A and the apron block 20A configured as described above.

  Further, the side S2 on the outer peripheral side of the apron 10A is about 785 mm, and is composed of a side S2 on the outer peripheral side of the apron 10A and sides S3 and S4 on both ends in the circumferential direction of the apron 10A. The angles θ1 and θ2 are about 87.2 °, respectively.

  According to this, the outer diameter in which the pitch angle P1 formed by connecting the sides S3 and S4 which are both ends in the circumferential direction of the apron 10A and the center O of the apron 10A with a virtual line is about 5 °. Can form an apron 10A of 18 m. Further, the outer diameter of the pitch angle P2 formed by connecting the sides S3 and S4 on both ends in the circumferential direction of the apron 10A and the center O of the apron 10 with an imaginary line is about 5.6 °. It becomes possible to form the apron 10A or the inner ring portion 12 of 16 m. Therefore, the outer diameter of the apron 10A can be changed by increasing or decreasing the apron block 20A.

  Furthermore, since the outer ring portion 11 is formed of 72 pieces and the inner ring portion 12 is formed of 64 pieces, the even number of apron blocks 20A, the apron forming the inner ring portion 12 is formed at four locations on the outer periphery of the apron 10A. The positions of the block 20A for use and the apron block 20A forming the outer ring portion 11 are aligned, which contributes to improving the workability of construction work.

  A third embodiment of the present invention will be described. In the following description, the same components as those in the first and second embodiments are denoted by the same reference numerals, and a description of all or a part thereof is omitted.

  As shown in FIGS. 12 to 15 and 17, the apron 10 </ b> B uses an apron block 20 </ b> B. As with the apron 10A, the apron block 20B has a side S1 on the inner peripheral side of the apron 10B of 687 mm, a side S2 on the outer peripheral side of the apron 10B, 785 mm, and the length (height) in the radial direction of the apron 10B. The thickness in the vertical direction is 990 mm, and the angles θ1 and θ2 are about 87.2 °, respectively.

  As shown in FIGS. 13 to 15, the apron block 20 </ b> B is arranged at the rear end of the apron 10 </ b> B in the clockwise direction (the end on the one end side in the apron circumferential direction in the claims). A gap forming portion 32 is provided, and is adjacent to an end portion on the front side in the clockwise direction of the apron 10B (an end portion on the other end side in the apron circumferential direction in the claims) in the circumferential direction of the apron 10B. A front gap forming portion 33 that is connected to the rear gap forming portion 32 of the apron block 20B to form the gap H is disposed.

  In the present embodiment, the rear gap forming portion 32 is located on the outer notch 32a located on the outer peripheral side of the apron 10B of the apron block 20B and on the inner peripheral side of the apron 10B of the apron block 20B. The inner notch 32b is positioned. Each of the outer notch 32a and the inner notch 32b is formed by notching a trapezoidal shape in which the end portion on the rear side in the clockwise direction is shorter than the end portion on the front side in the clockwise direction.

  In the present embodiment, the front gap forming portion 33 is located on the outer notch 33a located on the outer peripheral edge side of the apron 10B of the apron block 20B, and on the inner peripheral edge side of the apron 10B of the apron block 20B. The inner notch 33b is positioned. Each of the outer notch 33a and the inner notch 33b is formed by notching a trapezoidal shape in which the end portion on the rear side in the clockwise direction is shorter than the end portion on the front side in the clockwise direction.

  As shown in FIGS. 16A and 16B, the connecting member 34 is formed in a flat plate shape and an isosceles trapezoid in a shape (butterfly joint shape) coupled with short sides.

  When the apron block 20B adjacent in the circumferential direction of the apron 10B is continuously provided, the outer notch 32a and the outer notch 33a, the inner notch 32b and the inner notch 33b are continuously provided, and the connecting member 34 is fitted. A possible gap H is formed.

  As shown in FIG. 13, the connecting member 34 is fitted into the gap H, and the adjacent apron blocks 20B are integrated to prevent the apron blocks 20B from being separated.

  As shown in FIG. 14, the attachment holes 29 are also provided in the central portion of the apron block 20 </ b> B, and the attachment holes 29 are arranged in a total of five locations.

  Construction and maintenance can be facilitated also by the apron 10B and the apron block 20B configured as described above.

  A fourth embodiment of the present invention will be described. In the following description, the same components as those in the first, second, and third embodiments are denoted by the same reference numerals, and the description of all or a part thereof is omitted.

  The apron 10C uses an apron block 20C. The apron block 20C has a side S1 on the inner peripheral side of the apron 10C of 687 mm, a side S2 on the outer peripheral side of the apron 10C of 785 mm, the length (height) in the radial direction of the apron 10C is 990 mm, and the thickness in the vertical direction. Is 20 mm, and the angles θ1 and θ2 are each about 87.2 °.

  As shown in FIGS. 18 to 22, the apron block 20 </ b> C has an occlusal portion at an end on the front side in the clockwise direction of the apron 10 </ b> C (an end on one end in the circumferential direction of the apron in the claims). An apron that is disposed adjacent to the end of the apron 10C in the clockwise direction (the end on the other end in the direction of the apron in the claims) in the circumferential direction of the apron 10C An occlusal portion 22C that engages with the occlusal portion 21C of the block 20C is disposed.

  In the present embodiment, the occlusal portion 21C is formed in a trapezoidal flat plate shape in which the end on the rear side in the clockwise direction is shorter than the end on the front side in the clockwise direction, as shown in FIGS. ing. Three occlusal portions 21C are provided along the side S4 on the front end side in the circumferential direction of the apron 10C of the apron block 20C.

  As shown in FIGS. 19 to 21, the to-be-occluded portion 22C is formed by notching a trapezoidal shape in which the end portion on the rear side in the clockwise direction corresponding to the occlusion portion 21C is shorter than the end portion on the front side in the clockwise direction. Yes. Three occluded portions 22C are provided along the side S3 on the rear end side in the circumferential direction of the apron 10C of the apron block 20C.

  Since the occlusal portion 21C and the occluded portion 22C are engaged with each other, the apron blocks 20 adjacent to each other in the circumferential direction of the apron 10C are prevented from being separated.

  A non-slip upper anti-slip portion 24 </ b> C is disposed over the entire upper surface 23 of the apron block 20. In the present embodiment, as shown by the shaded portion in FIG. 3, the entire upper surface 23 is textured.

  An anti-slip portion 26C with anti-slip is provided over the entire area of the lower surface 25 of the apron block 20C. In the present embodiment, as shown by the shaded portion in FIG. 4, the four corner portions of the lower surface 25 around the mounting hole 29 described later are subjected to the texture processing.

  As shown in FIG. 22, when the apron block 20 is overlapped in the vertical direction, the upper slip prevention portion 24 of the apron block 20 disposed on the lower side and the lower slip of the apron block 20 disposed on the upper side. It is possible to prevent the apron blocks 20 adjacent to each other in the vertical direction from coming into contact with the stopper 26 and sliding.

  Construction and maintenance can be facilitated also by the apron 10c and the apron block 20c configured as described above.

  The apron and the apron block of the present invention are not limited to the above configuration. That is, various design changes can be made without departing from the gist of the present invention.

  In the apron 10 of the first embodiment, as shown in FIGS. 23 and 24, as a modification of the upper slip prevention portion 24 provided in the apron block 20, a connecting projection is provided on the central projection 24 a and the side projections 24 b and 24 c. An upper slip stopper 24D to which 24d and a branch protrusion 24e are added can be applied.

  The connecting protrusion 24d has a substantially trapezoidal shape with a short cross-sectional end on the side away from the upper surface 23 of the apron block 20, is formed to protrude upward from the upper surface 23 of the apron block 20, and is parallel to each other. The central protrusion 24a, the side protrusions 24b, and 24c are orthogonal to the central protrusion 24a and the side protrusions 24b and 24c. 24a and the side protrusion 24c are connected to each other.

  The branch protrusion 24e has a substantially trapezoidal shape in which the cross-sectional shape is a short trapezoidal end on the side away from the upper surface 23 of the apron block 20, and protrudes upward from the upper surface 23 of the apron block 20.

  The branch protrusion 24e extends at two points from the side protrusion 24b toward the side S3 which is the rear side in the clockwise direction of the apron 10 of the apron block 20 from the side protrusion 24b. Two portions are extended from the side projection 24c toward the side S4 which is the front side in the clockwise direction of the apron 10 of the apron block 20 from the side projection 24c.

  As a modification of the non-slip portion 26 provided in the apron block 20, a lower anti-slip portion 26D in which a connecting groove 26d and a branch groove 26e are added to the central bottom groove 26a and the side bottom grooves 26b and 26c is applied. be able to.

  The connecting groove 26d is formed as a substantially trapezoidal bottomed groove corresponding to the central protrusion 24a from the lower surface 25 of the apron block 20 to the upper surface 23, and is provided at three locations so as to be parallel to each other. The central bottomed groove 26a, the side bottomed grooves 26b, and 26c are orthogonal to each other, and at the center of the lower surface 25 of the apron block 20, the central bottomed groove 26a, the side bottomed groove 26b, and the central bottomed groove 26a It is formed to connect the side bottom groove 26c.

  The branch groove 26e extends from the lower surface 25 of the apron block 20 to the upper surface 23, and is formed as a substantially trapezoidal bottomed groove corresponding to the central protrusion 24a.

  The branch groove 26e is perpendicular to the side bottom groove 26b and extends from the side bottom groove 26b toward the side S3 which is the rear side in the clockwise direction of the apron 10 of the apron block 20, and Two orthogonally extending from the side bottomed groove 26c toward the side S4 which is the front side in the clockwise direction of the apron 10 of the apron block 20 from the side bottomed groove 26c.

  When the apron block 20 is overlapped in the vertical direction, the apron block is engaged in the cross direction by the engagement of the connection protrusion 24d and the connection groove 26d, and the branch protrusion 24e and the branch groove 26e. The anti-sliding effect of 20 can be enhanced. Further, the slippage of the vehicle can be prevented by the connecting protrusions 24d and the branch protrusions 24e, and the antislip effect at the installation location G can be enhanced by the connecting grooves 26d and the branch grooves 26e.

  In this case, the upper surface 23 of the apron block 20 around the connecting protrusion 24d, which connects the central protrusion 24a and the side protrusion 24b, and the central protrusion 24a and the side protrusion 24c, is the inner peripheral edge side of the apron 10. It is desirable to incline so that rainwater flows toward the side S1 and the side S2 on the outer peripheral side of the apron 10.

  As another modification of the upper slip stopper 24, as shown in FIGS. 25 and 26, an upper slip stopper 24E having side protrusions 24f and 24g, a connecting protrusion 24h, and a branch protrusion 24i may be applied. it can.

  The side protrusions 24f and 24g have a substantially trapezoidal shape in which the end of the cross section of the apron block 20A away from the upper surface 23 is short and protrudes upward from the upper surface 23 of the apron block 20A. It is formed so as to be parallel to the sides S3 and S4 which are both ends in the direction. The side protrusions 24f and 24g are connected to the line C connecting the intermediate point of the side S1 on the inner peripheral side of the apron 10A and the intermediate point of the side S2 on the outer peripheral side of the apron 10A. It arrange | positions so that the side used as the outer periphery side of the apron 10A may expand.

  The connecting protrusion 24h has a substantially trapezoidal shape with a short cross-sectional shape and a short end on the side away from the upper surface 23 of the apron block 20, and protrudes upward from the upper surface 23 of the apron block 20. The side projection 24f and the side projection 24g are connected to each other at the center of the upper surface 23 of the apron block 20.

  The branch protrusion 24i has a substantially trapezoidal shape with a short cross-sectional end on the side away from the upper surface 23 of the apron block 20, and is formed to protrude upward from the upper surface 23 of the apron block 20.

  The branch protrusions 24i are inclined with respect to the side protrusions 24f and extend from the side protrusions 24f toward the side S3 which is the rear side in the clockwise direction of the apron 10 of the apron block 20, and Inclined with respect to the side protrusion 24g and extended from the side protrusion 24g toward the side S4 on the front side in the clockwise direction of the apron 10 of the apron block 20.

  As another modification of the lower slip stopper 26, an upper slip stopper 24E having side bottom grooves 26f and 26g, a connecting groove 26h, and a branch groove 26i can be applied.

  The side-bottomed grooves 26f and 26g are formed in a substantially trapezoidal shape corresponding to the side protrusions 24f and 24g along the apron block 20A from the lower surface 25 to the upper surface 23, and are in the circumferential direction of the apron 10. It is formed so as to be parallel to the sides S3 and S4 which are both ends in the direction. The side bottom grooves 26f and 26g are provided on the apron block 20A with respect to a line C connecting an intermediate point of the side S1 on the inner peripheral side of the apron 10 and an intermediate point of the side S2 on the outer peripheral side of the apron 10. The apron 10 is arranged so that the outer peripheral edge side of the apron 10 is expanded.

  The connection groove 26h is formed as a substantially trapezoidal bottomed groove corresponding to the side protrusions 24f and 24g, and is formed in a substantially square shape, from the lower surface 25 of the apron block 20 to the upper surface 23. At the center of the lower surface 25 of the apron block 20, the bottomed grooves 26f and 26g are formed so as to be connected.

  The branch groove 26i is inclined with respect to the side bottomed groove 26f and extends from the side bottomed groove 26f to two sides S3 which are the rear side in the clockwise direction of the apron 10 of the apron block 20, and The two bottomed grooves 26g are inclined toward the side S4 on the front side in the clockwise direction of the apron 10 of the apron block 20 from the side bottomed groove 26g.

  Even with such a configuration, when the apron block 20 is overlapped in the vertical direction, the upper slip prevention portion 24E and the lower slip prevention portion 26E are engaged with each other, and the sliding prevention effect of the apron block 20 can be enhanced. .

  As a modified example of the upper non-slip portion 24A, as shown in FIG. 27, the side protrusions 24A2 and 24A3 can be arranged so that the side of the apron block 20A on the inner peripheral side of the apron 10A is expanded. is there.

  As a modified example of the lower anti-slip portion 26A, as shown in FIG. 28, the side bottom grooves 26A2 and 26A3 correspond to the modified example of the upper non-slip portion 24A, and the inner peripheral side of the apron 10A of the apron block 20A. It is also possible to arrange so that the side to be expanded. In this case, six attachment holes 29 are provided.

  Even with such a configuration, when the apron block 20A is superposed in the vertical direction, the sliding prevention effect of the apron block 20A can be enhanced.

  Moreover, although the apron diameter is 18 m, the apron diameter can be appropriately changed, such as 16 m.

  Moreover, although the apron is comprised by the inner and outer double provided with the outer ring part 11 and the inner ring part 12, as shown in FIG. 29, the apron is arranged in a line along the circumferential direction with the apron block. It can also be formed.

  Further, the size and thickness of the apron block can be appropriately changed in accordance with the size of the apron. For example, the thickness of the apron block can be set to 10, 30, 40, 50 mm other than 20 mm. Further, the apron blocks can be overlapped in three or more stages in the vertical direction.

  Further, if the occlusal part and the occluded part can be engaged with each other, other shapes such as a circular shape and a polygonal shape can be used.

  Further, the number of occlusal portions 21 other than one may be provided, the number of occlusal portions 21C may be provided other than three, and the number of occluded portions 22 and the portions to be occluded 22C may be provided corresponding to the occlusal portions 21 and the occlusal portions 21C.

  In addition, the apron block can be configured such that the side S1 on the inner peripheral side of the apron and the side S2 on the outer peripheral side of the apron can be formed in an arc shape or bent at an obtuse angle close to 180 °.

  Further, the upper slip prevention portion and the lower slip prevention portion may have other configurations as long as they have a slip prevention function.

  For example, the lower slip prevention part 26 of the apron block 20 arranged on the upper side is a convex part protruding downward, and the upper slip prevention part 24 of the apron block 20 arranged on the lower side can be engaged with the convex part. It can also be a recess.

  Further, the upper slip prevention part 24C and the lower slip prevention part 26C are formed in the entire area of the upper surface 23 of the apron block 20C and in the entire area of the lower surface 25 of the apron block 20C. It is also possible to form the upper surface 23 of the apron block 20C and the lower surface 25 of the apron block 20C in partial areas.

  In addition, the apron block is made of synthetic resin, but rubber, metal, concrete, ceramics, or the like can be used as long as the apron block can withstand even if the vehicle rides on.

  For example, as synthetic resin and rubber, PC, ABS, PP, PBT, SMC, BMC, {FRO (fiber reinforced plastic)}, PMMA (acrylic), urethane, vinyl chloride, recycled plastic, polyurethane rubber, waste tire, Examples thereof include foam rubber and polyethylene.

  Examples of the metal include aluminum, aluminum alloy, stainless steel, plating, and iron / copper / brass to which a corrosion resistant paint is applied.

  Examples of concrete include lightweight concrete and fiber reinforced concrete.

  Moreover, the road surface marking part 28 may apply the phosphorescent paint or attach the road surface display material to the end surface 27 as long as the presence of the apron 10 can be known.

  In addition, if the mounting holes 29 can be fixed to the installation place G, a number other than four, five, and six (about four to ten places per sheet) can be provided as necessary. It is also possible to fix with the corresponding number of buried anchors 31 and bolts 30.

  Moreover, a slope can be separately provided inside and outside the apron as required.

  Further, when the apron block is overlapped in the vertical direction, the bolt 30 is inserted into only the mounting hole 29 of the apron block arranged on the lower side and screwed with the embedded anchor 31 to install the apron block. The apron block that is fixed to G and arranged on the lower side and the apron block that is arranged on the upper side are only engaged with the upper non-slip portion and the lower anti-slip portion, or the upper non-slip portion and the lower slip It is also possible to bite the stopper and fix it with an adhesive or the like.

10 Apron 10A Apron 10B Apron 10C Apron 11 Outer ring part 12 Inner ring part 20 Apron block 20A Apron block 20B Apron block 20C Apron block 21 Occlusal part 21A Occlusal part 21C Occlusal part 22 Occlusal part 22A Occlusal part 22C Occluded portion 23 Upper surface 24 Upper slip prevention portion 24A Upper slip prevention portion 24C Upper slip prevention portion 24D Upper slip prevention portion 24E Upper slip prevention portion 25 Lower surface 26 Lower slip prevention portion 26A Lower slip prevention portion 26C Lower slip prevention portion 26D Lower slip prevention portion 26E Lower slip Stop portion 27 End surface 28 Road surface marking portion 29 Mounting hole 30 Bolt 31 Buried anchor 32 Rear gap forming portion 33 Front gap forming portion 100 Central island 101 Ring road 102 Apron G Installation location H Clearance l Length O Center S1 Side S2 Side S3 Side S4 side

Claims (15)

An apron block constituting a substantially annular apron installed between the central island of the roundabout and the ring road,
The apron block is
The apron is formed in a shape that is divided along the circumferential direction, and in a plan view, the side that is the inner peripheral side of the apron is formed in a substantially trapezoidal shape that is shorter than the side that is the outer peripheral side of the apron, and a bolt Has a mounting hole to be inserted,
The upper surface is formed in a shape corresponding to the lower surface of the apron block arranged on the upper side when the apron block is overlapped in the vertical direction,
The lower surface is formed in a shape corresponding to the upper surface of the apron block disposed on the lower side when the apron block is overlapped in the vertical direction,
The apron is formed by connecting a plurality of blocks for the apron along a direction that is a circumferential direction of the apron,
The apron block, which is installed at the installation location by screwing the bolt inserted into the mounting hole with an embedded anchor disposed at the installation location.   The occlusal portion is disposed at an end portion on one end side in the circumferential direction of the apron, and the occlusal portion of the apron block adjacent to the end portion on the other end side in the circumferential direction of the apron The apron block according to claim 1, wherein an occlusal portion that engages with the apron is disposed. A first gap forming portion is disposed at one end of the apron in the circumferential direction, and a second gap forming portion is disposed at the other end in the apron circumferential direction. Is arranged,
When the apron block is continuously provided along the apron circumferential direction, there is a gap between the first gap forming portion and the second gap forming portion of the apron block adjacent thereto. 2. The apron block according to claim 1, wherein the apron block is formed, and a connecting member that connects the adjacent apron blocks can be fitted into the gap. 3. 4. The apron block according to claim 1 , wherein an upper slip prevention portion having a slip prevention function is disposed on at least a part of the upper surface . The apron block according to claim 1, 2 or 3 , wherein a lower slip prevention portion having a slip prevention function is disposed on at least a part of the lower surface . At least a part of the upper surface is provided with an anti-slip portion having an anti-slip function,
At least a part of the lower surface is provided with a lower anti-slip portion having an anti-slip function,
When the apron block is overlapped in the vertical direction, the lower slip prevention portion of the apron block disposed on the upper side can contact the upper slip prevention portion of the apron block disposed on the lower side. The apron block according to claim 1, 2 or 3, wherein An apron block constituting a substantially annular apron installed between the central island of the roundabout and the ring road,
The apron block is
The apron is formed in a shape that is divided along the circumferential direction, and in a plan view, the side that is the inner peripheral side of the apron is formed in a substantially trapezoidal shape that is shorter than the side that is the outer peripheral side of the apron, and a bolt Has a mounting hole to be inserted,
At least a part of the upper surface is provided with an anti-slip portion having an anti-slip function,
At least a part of the lower surface is provided with a lower anti-slip portion having an anti-slip function,
When the apron block is overlapped in the vertical direction, the lower slip prevention portion of the apron block disposed on the upper side can contact the upper slip prevention portion of the apron block disposed on the lower side. is a,
The apron is formed by connecting a plurality of blocks for the apron along a direction that is a circumferential direction of the apron,
The apron block, which is installed at the installation location by screwing the bolt inserted into the mounting hole with an embedded anchor disposed at the installation location. The apron block according to any one of claims 1 to 7 , wherein a road marking portion is provided on an end surface on the outer peripheral edge side of the apron. The apron block according to claim 8 , wherein the road surface marking portion is formed by attaching a reflective sheet to an end surface on the outer peripheral edge side of the apron, or by applying paint. Wherein the the sides 7 85 mm as the outer peripheral edge of the apron, and the side which becomes the outer peripheral edge of the apron, the angle formed by the at both ends sides in the circumferential direction to become the direction of the apron respectively are 8 7 The apron block according to claim 1 , wherein the apron block is set to 2 °. Wherein the the sides 6 28mm as the outer peripheral edge of the apron, and the side which becomes the outer peripheral edge of the apron, the angle formed by the at both ends sides in the circumferential direction to become the direction of the apron respectively are 8 7 The apron block according to claim 1 , wherein the apron block is set to 7 °. A substantially annular apron installed between the central island of the roundabout and the ring road,
An apron, wherein a plurality of the apron blocks according to any one of claims 1 to 11 are formed continuously along a circumferential direction of the apron. The apron includes a substantially annular outer ring part, and a substantially annular inner ring part located inside the outer ring part,
The outer ring portion is formed of the apron block according to any one of claims 1 to 11 ,
The apron according to claim 12 , wherein the inner ring part is formed of a plurality of apron blocks according to any one of claims 1 to 11 . A substantially annular apron installed between the central island of the roundabout and the ring road,
The apron block according to claim 3 is formed by being continuously provided along a direction that is a circumferential direction of the apron,
A gap is formed between the first gap forming portion and the second gap forming portion of the apron block adjacent to the first gap forming portion, a connecting member is fitted into the gap, and the adjacent apron blocks are connected to each other. Apron characterized by that. A substantially annular apron installed between the central island of the roundabout and the ring road,
The apron block according to claim 1 or 7 , wherein the apron block is formed by being continuously provided along a circumferential direction of the apron, and is formed by being overlapped in the vertical direction.

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