JP2013023947A - Overhang block and stopping lane formed by using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stopping lane capable of protecting a root of a street tree planted on the roadway side of a sidewalk.SOLUTION: An overhang block includes a deck slab 11 which is buried directly beneath a roadway 2, a sidewalk-side vertical wall 12 which is erected on the sidewalk side of the deck slab 11, and a top slab 14 which overhangs toward a sidewalk 3 form the sidewalk-side vertical wall 12. The many overhang blocks 1, which have the deck slabs 11 buried directly beneath the roadway 2 and the top slabs 14 of which are orthogonal to the extension directions of the roadway 2 and the sidewalk 3, are installed, and the top slabs 14 of all the overhang blocks 1 are connected together to form a stopping lane 4 capable of protecting a root of a street tree.

Description

  The present invention relates to an overhanging block that forms a stop zone sandwiched between a roadway and a sidewalk, and a stop zone formed using the block.

  When roadways and sidewalks are arranged side by side, roadside trees are often planted on the sideways of roadways for the purpose of improving the beauty of the landscape, protecting the environment of the sidewalks, and providing shade to pedestrians. In such a roadside tree, blocks constituting the sidewalk are laid down to the vicinity of the trunk, but in order to secure a space where the roots extend, the lower part of the block remains soil. In this case, if the space where the root extends is stepped on by a pedestrian, the growth of the root will be hindered. Conversely, if the root is excessively extended, the block may be lifted and the sidewalk may be damaged. Therefore, a concrete block for tree planting may be installed around the trunk of the roadside tree (Patent Document 1).

  The concrete block for tree planting disclosed in Patent Document 1 is composed of a unit side wall block whose upper surface and lower surface are opened, and a cover body that covers the upper surface opened on the unit side wall block (Patent Document 1 and [Billing]. Item 1]). The roadside tree extends a trunk from a notch provided in the lid and extends its root into a space surrounded by the unit side wall block below the lid. The concrete block for tree planting disclosed in Patent Document 1 is provided with a side portion that is open to the unit side wall block while securing a space where the root extends within the range of the sidewalk, and the root of the roadside tree extends toward the lower side of the roadway. (Patent Document 1 [0015] [FIG. 4]).

JP-A-11-137103

  The space where the root of the roadside tree extends can be secured below the sidewalk by using the planting concrete block disclosed in Patent Document 1 described above. However, if only the roots extend from the concrete block for tree planting toward the lower side of the roadway, there is a risk that the load applied to the roadway may compress the roots. In particular, if a stop zone is provided along the sidewalk, the vehicle will stop for a long time above the extended root, and pressure on the root cannot be ignored. Therefore, in order to protect the roots of the roadside trees planted on the side of the sidewalk along the stop, we studied.

  As a result of examination, it is an overhanging block that forms a stop zone sandwiched between the roadway and the sidewalk, a bottom slab embedded directly under the roadway, a sidewalk-side vertical wall that stands on the sidewalk side of the bottom plate, and the sidewalk We have developed an overhanging block that is composed of a top plate that projects from the side wall to the sidewalk. The bottom plate may be provided with a roadway side vertical wall that is paired with the sidewalk side vertical wall on the roadway side. The bottom and top plates are basically horizontal. The top plate may have a downward slope with the upper surface facing the sidewalk.

  The stop zone is composed of a bottom plate buried directly under the roadway, a sidewalk side vertical wall standing on the sidewalk side of the bottom plate, and a top plate protruding from the sidewalk side vertical wall toward the sidewalk. The bottom plate is buried directly below, and a number of overhanging blocks with the top plate orthogonal to the extending direction of the roadway and sidewalk are installed, and the top plates of all overhanging blocks are connected to form. A number of overhanging blocks that form a stop zone by connecting the top plates are basically the same type with the same external shape, but as long as tension is given by the PC steel material described later, multiple types with different external shapes are mixed. You may let them. The top surface of the top plate should be flush with the roadway and used as it is as a stop zone, or the same as the road pavement.

  In the present invention, a number of overhanging blocks are arranged side by side to form a continuous portion of the top plate, that is, a road provided along a sidewalk or an accompanying portion, and “a portion of a strip-shaped roadway provided mainly for use in stopping a vehicle” (Road Structure Ordinance, Article 2, Item 14) ", a number of overhanging blocks are lined up, and the portion of the top plate is called a" stop zone ". In other words, since the road or the accompanying part provided along the sidewalk can be used as a parking zone, a side road, or a bicycle exclusive road, the present invention includes the parking zone, the side road, or the bicycle exclusive road.

  The overhanging block of the present invention projects a top plate from the roadway side toward the sidewalk, and forms a stop zone where the top plates are connected while securing a space in which the roots of the roadside trees extend below the top plate. Each top plate forming the stop zone is pushed downward by a counter block formed by a roadway or cast concrete, and a force that is lifted relatively upwards acts. Even if the car stops continuously, it does not put pressure on the roots of the roadside trees. In addition, the continuous top plate also has a function of protecting the common wire groove, water pipe, or sewer pipe buried below.

  The stop zone formed by the overhanging block is near the sidewalk of the roadway, and there is a case where the drainage groove provided at the boundary between the sidewalk and the roadway is usually away from the roadway. Therefore, the overhanging block is composed of a standing surface facing the sidewalk side vertical wall and a horizontal surface facing the bottom plate with respect to the sidewalk side vertical wall and the bottom plate, and a drainage path connecting the upper surface and the lower surface of the horizontal surface. It is preferable to form a drainage groove having a closed sectional structure surrounded by a bottom plate, a sidewalk side vertical wall, a standing surface, and a horizontal plane. Thereby, rain water falling on the roadway can be immediately poured into the drainage channel.

  When forming the drainage groove, the overhanging block has an inner opening facing the drainage groove and an outer opening facing the lower part of the top plate on the side plate of the top plate or side wall on the side of the road that is orthogonal to the extending direction of the roadway and sidewalk. It is preferable to provide an overflow groove to be connected. The overflow groove, when the side blocks of the top plate are in close contact with each other and the overhanging blocks are arranged, allows the inner opening facing the drainage groove to communicate with the outer side opening facing the bottom of the top plate without being blocked by the side end surface, The rainwater overflowing from the drainage is drained to the bottom of the top plate. The inner opening that faces the drainage groove opens on the side surface of the side wall on the side of the roadway. The outer opening facing the lower side of the top plate only needs to be at a position lower than the inner side opening, and opens to the lower surface of the top plate or to the side surface on the sidewalk side of the sidewalk side vertical wall.

  The overhanging block has through holes extending in the extending direction of the roadway and sidewalk in one or more of the bottom plate, the side wall on the sidewalk, or the top plate, and inserted through the through holes of each of the many overhanging blocks installed. It is preferable to form a stop zone in which the top plates are connected by using PC steel to bring the numerous protruding blocks into close contact with each other. In the unlikely event that a large number of overhanging blocks are in close contact with each other, the top plate of a specific overhanging block should sink, but the overhanging blocks on both sides of the overhanging block will sink through the PC steel. Is suppressed or prevented.

  When the top plate forming the stop zone protects the roots of the roadside trees, it is preferable to provide a water passage that connects the top and bottom surfaces of the top plate so that rainwater can reach the roots. When the water passage is provided on the top plate, the stop pavement covered with the top plate is formed of a pavement material having water permeability. The “water passage” means that rainwater has a function of flowing from the upper surface to the lower surface of the top plate, and the top plate made of porous concrete is the whole water passage. The water flow path of the top plate usually made of concrete includes a water passage hole or a water passage slit penetrating from the top surface to the bottom surface of the top plate, and the side end surface of the top plate perpendicular to the extending direction of the roadway and sidewalk. A concave portion formed by being recessed from the upper surface to the lower surface of the top plate can be exemplified. The concave portion forms a water passage hole or a water passage slit in the space between the top plates of adjacent overhanging blocks when the side blocks of the top plate are brought into close contact with each other.

  When the water passage hole or the water passage slit or the concave portion is provided, the top plate of the overhanging block is preferably formed with an inclined surface having a downward slope toward the upper surface side opening of the water passage. As a result, the rainwater that has fallen on the top surface of the top plate is guided to the water passage hole or the water passage slit formed by the water passage hole, the water passage slit, or the concave portion, and the rainwater extends to the root of the roadside tree that extends below the top plate without waste. Will come across. Moreover, when a water flow hole or a water flow slit or a recessed part is provided, the top plate of the overhanging block may be filled or fitted with a water permeable member in a water passage (including those formed by the recessed part). As a result, even if the stopband pavement is not applied, no dust is collected in the water passage holes, and when the stopband pavement is applied, the pavement material does not fall into the water passage holes. Examples of the water permeable member include porous concrete and gravel filled in the water passage hole, and a synthetic resin mesh pipe fitted into the water passage slit.

  The overhanging block of the present invention has the effect that the root of the roadside tree planted on the side of the sidewalk protects against the load of the vehicle that stops at the stop. The roots of the roadside trees can extend widely under the top plate that forms the stop zone, and together with the root protection blocks that were conventionally installed on the sidewalk, form a space where the roots of the roadside trees extend widely in all directions. . This means that larger street trees can be planted than before, and the purpose of the street trees (improving the aesthetics of the landscape, protecting the environment of the sidewalk and providing shade to the pedestrians) will be better achieved.

  The drainage groove formed by covering the side wall and the bottom plate of the overhanging block with the side groove block enables drainage of rain water falling on the roadway immediately. Through holes provided in one or more of the bottom plate, the side wall on the sidewalk, or the top plate give tension to many overhanging blocks made of inserted PC steel, and regulate the sinking of the top plate to each other. Provides stable protection of tree roots.

  The water flow path (water flow hole or water flow slit, etc.) provided on the top plate allows rainwater to pass from the upper surface to the lower surface of the stop zone formed by arranging the overhanging blocks of the present invention. Spread rainwater. This makes it easier for the roots of the roadside trees to extend into the space secured below the top plate. The inclined surface with the downward slope toward the opening on the upper surface side of the water passage better guides rainwater to the lower surface of the stop zone, and makes the roots of the street trees easier to extend into the space secured under the top plate.

It is the perspective view which looked at the 1st example of the overhanging block of this invention from the sidewalk side diagonally upward. It is the perspective view which looked at the 2nd example of the overhanging block of this invention from the sidewalk side diagonally upward. It is the perspective view which looked at the 3rd example of the overhanging block of the present invention from the sidewalk side diagonally upper part. It is the perspective view which looked at the 4th example of the overhanging block of the present invention from the sidewalk side slanting upper part. It is the perspective view which looked at the 5th example of the overhanging block of this invention from the sidewalk side diagonally upward. It is the perspective view which looked at the 6th example of the overhanging block of the present invention from the sidewalk side slanting upper part. It is the perspective view which looked at the 7th example of the overhanging block of the present invention from the sidewalk side slanting upper part. It is the perspective view which looked at the 8th example of the overhanging block of this invention from the sidewalk side diagonally upward. It is the perspective view which looked at the 9th example of the overhanging block of the present invention from the sidewalk side slanting upper part. It is the perspective view which looked at the 10th example of the overhanging block of this invention from the sidewalk side diagonally upward. It is the perspective view which looked at the step which has arranged the overhanging block from the slanting upper part on the sidewalk in the formation procedure of the stop zone by the overhanging block of the 8th example. It is the perspective view which looked at the step which has arranged the side groove block from the slanting upper part on the sidewalk side in the formation procedure of the stop zone by the overhanging block of the 8th example. It is the perspective view which looked at the step which has fitted the mesh pipe between the recessed steps which oppose in the formation procedure of the stop zone by the overhanging block of the 8th example from the side of the sidewalk. It is the perspective view which looked at the stage which constructed the roadway pavement and the stopband pavement from the diagonally upper side on the sidewalk in the formation procedure of the stopband by the overhanging block of the eighth example. It is sectional drawing of the transverse direction of the stop zone by the overhanging block of the 8th example. It is a top view of the stop zone by the overhanging block of the 8th example (illustration of roadway pavement and stop zone pavement is omitted).

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The overhanging block 1 according to the present invention is made of precast concrete, and as shown in FIG. 1, for example, the bottom plate 11 having a rectangular shape in plan view and the bottom plate 11 is inclined slightly toward one end side (the sidewalk side) of the bottom plate 11. The sidewalk side vertical wall 12 and the top plate 14 having a rectangular shape in plan view projecting from the sidewalk side vertical wall 12 toward the one end (sidewalk). The overhanging block 1 of the first example is provided with a pair of roadway side vertical walls 13 that are inclined slightly toward the other end side (roadway side) of the bottom slab 11 and the sidewalk side vertical wall 12. .

  The overhanging block 1 of the first example has the same width in the direction perpendicular to the overhanging direction of the top plate 14 of the bottom plate 11, the sidewalk side vertical wall 12, the roadway side vertical wall 13 and the top plate 14, respectively. The block 1 as a whole is rectangular in plan view. The bottom plate 11 has a constant thickness in the vertical direction, while the top plate 14 has a wedge-shaped cross section that tapers in the protruding direction. In addition, the overhanging block 1 of the first example is in a direction orthogonal to the overhanging direction of the top plate 14 on the sidewalk side vertical wall 12, the bottom plate 11 and the roadway side vertical wall 13 (extension direction of the roadway and the sidewalk). An extending through hole 15 is provided. The through hole 15 is inserted through the PC steel material 151.

  The overhanging block 1 of the first example is a counter block 22 by filling the space surrounded by the side wall 12 on the sidewalk, the bottom plate 11 and the vertical wall 13 on the roadway with concrete or earth and sand, or a block installed in the space. The counter block 22 is used (see FIGS. 14 and 15 below). The bottom surface of the bottom plate 11 and the top surface of the top plate 14 are horizontal and parallel. From this, if the overhanging block 1 is placed on a horizontal excavation ground, the top surface of the top plate 14 also becomes horizontal, and a flat stop zone 4 (see FIGS. 14 and 15 described later) can be formed. The top surface of the top plate 14 and the top surface of the roadway side vertical wall 13 are flush with each other. From now on, if the overhanging block 1 is placed on a horizontal excavation ground, the stop pavement 41 that follows the upper surface of the top plate 14 and the road pavement 21 that follows the upper surface of the roadside vertical wall 13 will be horizontal and flush with each other. .

  As shown in FIG. 2, the overhanging block 1 of the second example has a bottom plate 11, a side wall 12 and a roadway side wall 13 and a top plate 14 provided with through holes 15 as in the first example. The side groove block 5 is covered with the sidewalk side vertical wall 12 and the bottom plate 11 to form a drainage groove 54 (see FIGS. 12 to 15 described later). In the overhanging block 1 of the second example, an additional step 111 for adding the standing surface 51 of the side groove block 5 is provided at the crossing corner of the bottom slab 11 and the side wall 12 on the sidewalk so as to protrude in a square shape. . Further, the overhanging block 1 of the second example is provided with an engagement step 141 for engaging the horizontal surface 52 of the side groove block 5 with the crossing corners of the side wall 12 and the top plate 14 being recessed into a square cross section. Yes.

  The side groove block 5 is made of a precast concrete composed of a rectangular standing surface 51 facing the side wall on the side wall 12 and a rectangular horizontal surface 52 facing the bottom plate 11. Forming a groove extending in a direction perpendicular to the protruding direction (extending direction of the roadway and sidewalk) in the middle of the horizontal direction of the horizontal plane 52 orthogonal to the direction, and an upper surface and a lower surface of the horizontal plane 52 in the vicinity of the middle of the groove A drainage slit (drainage channel) 53 is provided. Thereby, the rainwater flowing from the roadway 2 or the stop belt 4 is surrounded by the bottom plate 11 of the overhanging block 1, the side wall 12 on the sidewalk side, the standing surface 51 of the side groove block 5 and the horizontal surface 42 through the drainage lit 53. It can be poured into the drainage groove 54 having a closed cross-sectional structure.

  As shown in FIG. 3, the overhanging block 1 of the third example has a bottom plate 11, a side wall 12 and a roadway side wall 13 and a top plate 14 provided with through holes 15, as in the second example. The overflow groove 146 communicated with the drainage groove 54 is formed in the direction in which the top plate 14 extends, so that the drainage groove 54 (see FIGS. 12 to 15 described later) can be formed by covering the side groove block 5. It is provided on the side end surface that extends in the direction orthogonal to the direction in which the roadway and the sidewalk extend. The overflow groove 146 may be provided on both side end surfaces, or may be provided only on one side end surface. The overhanging block 1 of the third example drains the rainwater below the top plate 14 through the overflow groove 146 when the volume of rainwater flowing into the drainage groove 54 increases. Since the root 312 of the roadside tree 31 extends below the top plate 14 (see FIG. 15 or FIG. 16 described later), the rainwater drained through the overflow groove 146 becomes the water supply to the root 312.

  As shown in FIG. 4, the overhanging block 1 of the fourth example has a bottom plate 11, a side wall 12 and a roadway side wall 13 and a top plate 14 provided with through holes 15, as in the first example. The heaven plate 14 is provided with a water passage slit (water passage route) 142 that extends in the protruding direction of the top plate 14 (the direction orthogonal to the extending direction of the roadway and the sidewalk). Although not shown, instead of the water passage slit 142 that is long in plan view, or together with it, a circular water passage hole (water passage route) in plan view may be provided in the top plate 14. The water passage slit 142 may be opened as it is when the top surface of the top plate 14 is used directly as a stop zone, but is filled with porous concrete or gravel, or a mesh pipe 16 (described later FIG. 13). It is better to avoid clogging of dust, etc., pavement material of the stop pavement, or depression of the stop pavement.

  As shown in FIG. 5, the overhanging block 1 of the fifth example has a bottom plate 11, a sidewalk side vertical wall 12, a roadway side vertical wall 13 and a top plate 14 provided with through holes 15, as in the first example. The side end surface extending in the protruding direction of the top plate 14 is recessed in the direction perpendicular to the plane (the extending direction of the roadway and the sidewalk) to provide a recess 143. The recess 143 has the same horizontal cross section from the top surface to the bottom surface of the top plate 14, and has a trapezoidal shape in side view following the top plate 14 having a wedge-shaped cross section. The recess 143 may be provided on both end surfaces, or only one side end surface. The concave portions 143 provided on both end surfaces may be aligned or displaced in the protruding direction of the top plate 14.

  When the side surfaces of the adjacent overhanging blocks 1 are brought into contact with each other, the recesses 143 form water passage slits 142 between the pair of recesses 143. In the case where the concave portion 143 is provided only on one of the side end surfaces of the top plate 14, a water passage slit 142 is formed between the concave portion 143 and the side end surface of the top plate 14 facing the concave portion 143. As described above, the water passage slit 142 formed by the concave portion 143 may be left open as it is when the top surface of the top plate 14 is used directly as a stop zone, but is filled with porous concrete or gravel, By inserting mesh pipe 16 (see FIG. 13 described later) to be described later, it is desirable to avoid situations such as clogging of dust, pavement material of the stop pavement, or depression of the stop pavement.

  As shown in FIG. 6, the overhanging block 1 of the sixth example is similar to the first example described above. However, the upper surface of the top plate 14 and the upper surface of the roadway side vertical wall 13 that are flush with each other are lifted up the roadway side to give a gradient α while maintaining the same relationship. This means that the top surface of the top plate 14 and the top surface of the roadway side vertical wall 13 are inclined toward the sidewalk side with a gradient α with respect to the bottom surface of the bottom plate 11. From now on, even if the overhanging block 1 is placed on the horizontal excavation ground, the top surface of the top plate 14 and the top surface of the roadway side vertical wall 13 have a downward slope toward the sidewalk. The pavement pavement 41 and the pavement pavement 21 (see FIGS. 14 and 15 described later) formed flush with the stop 4 have a downward slope toward the sidewalk, and rainwater falling on the pavement 2 or the stop 4 Can be guided to the sidewalk.

  As shown in FIG. 7, the overhanging block 1 of the seventh example is similar to the fifth example described above, in the bottom plate 11, the side wall 12 and the roadway side wall 13 and the top plate 14 provided with through holes 15. The top surface of the top plate 14 is formed on the top surface of the top plate 14 while the side end surface extending in the projecting direction of the top plate 14 is recessed in the direction perpendicular to the plane (the extending direction of the roadway and the sidewalk) to form a recess 143. An inclined surface 145 having a mountain-shaped cross section in a direction orthogonal to the overhanging direction (extending direction of the roadway and the sidewalk) and a downward slope toward the concave portion 14 is provided. The seventh inclined surface 145 is linear in cross section, but if the downward gradient is aligned in one direction (in the seventh example, the direction orthogonal to the protruding direction of the top plate 14), the downward inclined gradient changes. Or a cross-sectional wave shape may be sufficient.

  When the overhanging block 1 of the seventh example is arranged in the extending direction of the roadway and the sidewalk, since the upper surface of the continuous top plate 14 is uneven, the stopping belt 4 is provided with the stopping belt pavement 41 to absorb the unevenness (rear) (See Figures 14 and 15). Absorption of unevenness by the stop belt pavement 41 is the same as the overhanging block 1 of the eighth example (FIG. 8) to the tenth example (FIG. 10) provided with the inclined surface 145. Further, in the overhanging block 1 of the seventh example, the side surface of the mesh pipe 16 (see FIG. 13 to be described later) fitted into the water passage slit 142 formed by abutting the pair of concave portions 143 follows the upper surface of the top plate 14. A concave step 144 having a square cross section for engaging the mesh pipe 16 is formed by cutting out the upper edge of the concave portion 143.

  As shown in FIG. 8, the overhanging block 1 of the eighth example is similar to the seventh example, the bottom plate 11 provided with the through holes 15, the sidewalk side vertical wall 12, the roadway side vertical wall 13 and the top plate 14. A side end surface extending in the projecting direction of the top plate 14 is recessed in the plane orthogonal direction (extension direction of the roadway and sidewalk) to provide a recess 143, and the top surface of the top plate 14 is In the same manner as in the second example, the side groove block 5 is formed in a mountain-shaped cross section in a direction orthogonal to the overhang direction (extension direction of the roadway and the sidewalk) and provided with an inclined surface 145 having a downward slope toward the recess 14. A drainage groove 54 (see FIGS. 12 to 15 described later) is formed by covering the side wall 12 and the bottom plate 11.

  As in the second example, the overhanging block 1 of the eighth example has an additional step 111 for adding the standing surface 51 of the side groove block 5 with a square cross section from the crossing corner of the bottom plate 11 and the side wall 12 on the sidewalk. The engaging step 141 for engaging the horizontal surface 52 of the side groove block 5 is provided by denting the crossing corners of the side wall 12 and the top plate 14. Further, in the overhanging block 1 of the eighth example, the side surface of the mesh pipe 16 (see FIG. 13 described later) fitted into the water passage slit 142 formed by abutting the paired concave portions 143 is the same as in the seventh example. A concave step 144 having a square cross section for engaging with the mesh pipe 16 is formed by cutting out the upper edge of the concave portion 143 so that the top surface of the top plate 14 is retained.

  As shown in FIG. 9, the overhanging block 1 of the ninth example has a bottom plate 11, a side wall 12 and a roadway side wall 13 and a top plate 14 provided with through holes 15 as in the eighth example. The side end surface of the top plate 14 extending in the protruding direction is recessed in the direction perpendicular to the plane (the direction in which the roadway and the sidewalk extend) to form a recess 143, and the upper edge of the recess 143 is cut away to form a recess step. 144, and the upper surface of the top plate 14 has a mountain-shaped cross section in a direction perpendicular to the protruding direction of the top plate 14 (the direction in which the roadway and the sidewalk extend), and an inclined surface 145 having a downward slope toward the concave portion 14 is formed. The drainage block 5 is further covered with the side wall 12 and the bottom slab 11 to form a drainage groove 54 (see FIGS. 12 to 15 described later). An overflow groove 146 communicating with the groove 54 is provided on a side end surface extending in the extending direction of the top plate 14 (a direction orthogonal to the extending direction of the roadway and the sidewalk).

  As shown in FIG. 10, the overhanging block 1 of the tenth example has a bottom plate 11, a sidewalk-side vertical wall 12, a roadway-side vertical wall 13 and a top plate 14 provided with through holes 15, as in the seventh example. The side end surface of the top plate 14 extending in the protruding direction is recessed in the direction perpendicular to the plane (the direction in which the roadway and the sidewalk extend) to form a recess 143, and the upper edge of the recess 143 is cut away to form a recess step. 144, and the upper surface of the top plate 14 has a mountain-shaped cross section in a direction perpendicular to the overhanging direction of the top plate 14 (the extending direction of the roadway and the sidewalk), and an inclined surface 145 having a downward slope toward the concave portion 14 In the same manner as in the sixth example, the slope α is given by lifting the roadway side of the top surface of the top plate 14 and the roadway side of the top surface of the roadway side vertical wall 13. From now on, even if the overhanging block 1 is placed on a horizontal excavation ground, a stop pavement 41 that follows the top surface of the top plate 14 or a road pavement 21 that is formed flush with the stop 4 (see FIGS. 15) is a downward slope toward the sidewalk, and rainwater falling on the roadway 2 or the stop 4 can be guided to the sidewalk.

  Taking the overhanging block 1 of the eighth example as an example, the procedure for forming the stop band 4 will be described. First of all, excavation avoiding the root 312 of the roadside tree 31 planted on the roadside side of the sidewalk 3, FIG. 11 (pavement of the sidewalk 3 is not shown in order to make the root 312 of the roadside tree 31 easier to understand. The bottom plate 11 is placed on a horizontal excavation ground, and a number of overhanging blocks 1 in which the top plate 14 is orthogonal to the extending direction of the roadway 2 and the sidewalk 3 are arranged. As a result, the top plate 14 of the overhanging block 1 overhangs to the vicinity of the trunk 311 of the roadside tree 31 and covers the root 312 extending toward the roadway side. The overhanging blocks 1 at this stage have gaps between them and are not necessarily arranged in parallel, and the PC steel material 151 is inserted through the through holes 15 provided in the same positional relationship of the overhanging blocks 1.

  The overhanging block 1 tightens the PC steel material 151 to eliminate the gap between them, and as shown in FIG. 12, the overhanging direction of the top plate 14 (the direction orthogonal to the extending direction of the roadway 2 and the sidewalk 3) Adhere the side edges. As a result, the multiple overhanging blocks 1 are integrated via the PC steel material 151 and are in close contact with each other in a tension state. The overhanging block 1 having the side end surfaces in close contact with each other, for example, when an external force is applied from above and the top plate 14 of the specific overhanging block 1 tries to sink, the overhanging blocks 1 on both sides of the overhanging block 1, 1 suppresses or prevents the subduction through the PC steel material 151. In addition, the tightening by the PC steel material 151 brings the protruding blocks 1 into close contact with each other and corrects the positional relationship between them.

  The lateral groove block 5 has the same width as that of the overhanging block 1 in the direction perpendicular to the overhanging direction of the top plate 14 of the overhanging block 1. The installation is completed simply by directing the standing surface 51 to the additional step 111 provided in the exit block 1 and engaging the horizontal surface 52 with the engagement step 141 from above. The side groove block 5 is the side wall 12 of the overhanging block 1 and the bottom plate before the road pavement 21 and the stop pavement 41 are applied after the tightening of the overhanging blocks 1 with the PC steel 151 or after the above stage. 11 and the drainage groove 54 may be formed.

  In this example, the side end surface of the top plate 14 in the projecting direction (the direction orthogonal to the extending direction of the roadway 2 and the sidewalk 3) is brought into close contact with the water passage slit 142 formed by abutting the pair of concave portions 143. The mesh pipe 16 made of synthetic resin is fitted, and the mesh pipe 16 is engaged with the concave step 144 formed on the upper edge of each concave portion 143, so that the side surface follows the upper surface of the top plate 14, and the mesh pipe 16 is It is held. As a result, even if the stop band pavement 41 is applied to the upper surface of the top plate 14 of the overhanging block 1, the asphalt may enter the water passage slit 142, or the formed stop band pavement 41 may be dented in time. Can be prevented. Instead of the mesh pipe 16, the water passage slit 142 may be filled with porous concrete or gravel, or a mesh net may be stretched on the upper surface opening of the water passage slit 142.

  After the mesh pipe 16 is fitted in the water slit 142 in this way, a block that becomes, for example, the counter block 22 is installed in the space surrounded by the bottom plate 11, the sidewalk side vertical wall 12 and the roadway side vertical wall 13, and the side groove block 5 The road surface 52 is flush with the upper surface of the counter block 22 and the upper surface of the vertical wall 13 of the overhanging block 1, and the stop 14 is paved on the top plate 14 of the overhanging block 1. If 41 is given, construction of the roadway 2 and the stop zone 4 will be completed as seen in FIG. The upper surface of the roadway 2, the upper surface of the horizontal surface 52 of the gutter block 5, and the upper surface of the stop zone 4 are flush with each other. The road pavement 21 may be a normal pavement made of asphalt. The stop belt pavement 41 is a pavement having water permeability so that rainwater can be guided to the water passage slit 142.

  As shown in FIGS. 15 and 16, the stop zone 4 is formed up to the vicinity of the trunk 311 of the roadside tree 31 planted on the roadway side of the sidewalk 3 and covers the root 312 of the roadside tree 31. . The top plate 14 of the overhanging block 1 that forms such a stop zone 4 has a force that the bottom plate 11 is pushed downward by the roadway 2 or the counter block 22 and is relatively lifted upward. Even if the vehicle stops continuously, it does not put pressure on the root 312 of the roadside tree 31 that extends downward. Further, as described above, since the overhanging blocks 1 are integrated with each other by the PC steel material 151, even if a load is applied only to the top plate 14 of the specific overhanging block 1, the root 312 can still be protected.

  The top plate 14 of the overhanging block 1 forming the stop zone 4 is densely spread in the extending direction of the roadway 2 and the sidewalk 3 and covers the root 312 of the roadside tree 31. However, since the stop belt pavement 41 has water permeability and a water passage slit 142 extending from the upper surface to the lower surface of the top plate 14 is formed by the recess 143 provided on the side end surface of the top plate 14, the stop belt pavement is provided. Rainwater can be distributed from the 41 to the root 312 through the water passage slit 142. In this way, the overhanging block 1 protects the root 312 from the pressure of the vehicle that stops, and without the top plate 14, the rainwater supplied is distributed to the root 312 so as not to hinder the growth of the roadside tree 31. To do.

1 Overhang block
11 Bottom plate
12 Side wall
13 Roadway side vertical wall
14 Tensho
15 Through hole
16 Mesh pipe 2 Roadway
21 Road pavement
22 Counter block 3 Sidewalk
31 Street trees
312 Root 4 stop
41 Stop belt pavement 5 Gutter block
51 Standing surface
52 Horizontal
53 Drain slit
54 Drainage channel α Upper surface slope

Claims (15)

A projecting block that forms a stop between the roadway and the sidewalk,
A tension plate comprising a bottom slab embedded directly under the roadway, a side wall on the side wall of the bottom plate, and a top plate projecting from the side wall on the side wall toward the side wall. Out block. The overhanging block according to claim 1, wherein one or more of the bottom plate, the vertical wall, and the top plate is provided with a through hole extending in the extending direction of the roadway and the sidewalk. The overhanging block according to claim 1, wherein the top plate is provided with a water passage connecting the upper surface and the lower surface. The overhanging block according to claim 3, wherein the water passage is a water passage hole or a water passage slit penetrating from the upper surface to the lower surface of the top plate. 4. The overhanging block according to claim 3, wherein the water passage is a recess formed by denting a side end surface of the top plate perpendicular to the extending direction of the roadway and the sidewalk from the upper surface to the lower surface of the top plate. The overhanging block according to any one of claims 3 to 5, wherein the top plate forms an inclined surface having a downward slope toward the upper surface side opening of the water passage. The overhanging block according to any one of claims 3 to 6, wherein the top plate is filled or fitted with a water-permeable member in the water passage. It is a stop formed by installing a protruding block between the roadway and the sidewalk,
The overhanging block is composed of a bottom slab embedded directly under the roadway, a sidewalk side vertical wall standing on the sidewalk side of the bottom plate, and a top plate protruding from the sidewalk side vertical wall toward the sidewalk,
A stop characterized by burying the bottom plate directly under the roadway, installing a number of overhanging blocks with the top plate orthogonal to the extending direction of the roadway and sidewalk, and connecting the top plates of all overhanging blocks. band. The overhanging block is composed of a standing surface facing the sidewalk side vertical wall and a horizontal surface facing the bottom plate with respect to the sidewalk side vertical wall and bottom plate, and a drainage path connecting the upper surface and the lower surface of the horizontal surface is provided. The stop band according to claim 8, wherein a drainage groove having a closed cross-sectional structure surrounded by a bottom plate, a sidewalk side vertical wall, a standing surface, and a horizontal plane is formed by covering the side groove block. The overhanging block has a through hole extending in the extending direction of the roadway and the sidewalk in one or more of the bottom plate, the side wall on the sidewalk, or the top plate,
The stop band according to claim 8 or 9, wherein the plurality of overhanging blocks are brought into close contact with each other by a PC steel material inserted through the through holes of each of the many overhanging blocks installed. The stop band according to any one of claims 8 to 10, wherein the overhanging block is provided with a water passage connecting the upper surface and the lower surface on the top plate. 12. The stop zone according to claim 11, wherein the water passage is a water passage hole or a water passage slit penetrating from the upper surface to the lower surface of the top plate. 12. The stop zone according to claim 11, wherein the water passage is a recess formed by denting a side end surface of the top plate perpendicular to the extending direction of the roadway and the sidewalk from the top surface to the bottom surface of the top plate. 14. The stop band according to any one of claims 11 to 13, wherein the overhanging block is formed on the top plate with an inclined surface having a downward slope toward the upper surface side opening of the water passage. 15. The stop band according to claim 11, wherein the overhanging block is filled or fitted with a water permeable member in the water passage of the top plate.

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