JP3152392U - Slope protection block - Google Patents

Abstract

A slope protection block that protects a road shoulder and a slope sloped downward from the road shoulder, the scouring of the slope surface 17 by rainwater along the lower edge 5 of the slope protection portion 3 occurs. A protective block that reduces road maintenance costs by providing as much prevention as possible is provided. A water flow reduction groove or projection is provided at a position close to at least the lower edge of the surface of the slope protecting portion to reduce the speed at which rain water flowing down the inclined surface flows out of the lower edge. . The water flow deceleration groove 8 or the projection may be a groove or a ridge that continues along the lower edge 5 of the slope protection portion 3 or may be a groove or a ridge that extends in an intermittent manner. The groove or ridge preferably has a shape having a low wall surface in a direction in which the water flowing on the inclined surface is dammed in a cross section obtained by cutting the block in parallel with the direction of water flowing on the inclined surface. [Selection] Figure 1

Description

  The present invention relates to the shape or structure of a slope protection block installed so as to cover the road shoulder and the upper part of the slope in order to protect the slope and the slope inclined downward from the road shoulder.

  A slope that slopes obliquely downward from the road shoulder is formed on both sides of the road provided with embankment and on the valley side of the road provided so as to cross the slope. A road having such a slope on the road side is easily damaged when the road surface connected to the slope is collapsed by simply paving the road with concrete or asphalt. Therefore, a method of making a concrete having a cross-sectional shape as shown in FIG. 14 is provided with a shoulder protection portion 2 and a slope protection portion 3 inclined downward on the shoulder portion of the road connected to such a slope. A concrete structure for protecting the surface (slope protection block) is provided to prevent the shoulder from collapsing. There are two types of slope protection blocks, one that is molded in the factory and one that is molded at the construction site by the slip form method. Some slope protection blocks are provided with protrusions such as curbstones of boundary blocks on the shoulder protection portion 2.

  When this type of slope protection block is constructed, the slope protection block 1 is provided on the road shoulder 18 and the concrete or asphalt is placed inside the road shoulder protection portion 2 (on the road side). The pavement layer 19 is formed so that the road surface has a height that matches the upper surface of the shoulder protection portion 2. The slope protection section 3 of the slope protection block is installed in a state of being buried shallowly on the top surface of the embankment 16 so that the top surface thereof is flush with the slope surface 17.

  Roads should be regularly inspected and repaired in order to prevent damage caused by disasters such as earthquakes and heavy rains, and in order to prevent deterioration in traffic comfort and safety due to long-term use. Maintenance is required. On the road where the slope protection block as described above is installed, the slope 17 of the soil is dug in the portion immediately below the lower edge 5 of the slope protection section 3, and its repair is necessary. Often happens. This is because the rain on the road surface and the slope protection block 1 flows downward along the surface of the slope protection part 3 of the block, and the soil immediately below the lower edge 5 is washed away (scouring). It is thought to be caused by

  The present invention provides a slope protection block which is shallowly embedded in an upper part of a slope sloped downward from a road shoulder and protects the upper part of the slope and the road shoulder connected to the slope, and the lower edge of the slope protection part 3 It is an object of the present invention to reduce road maintenance costs by preventing as much as possible the scouring of the slope 17 due to rainwater along the line 5.

  In this device, in a slope protection block comprising a horizontal shoulder protection portion 2 constructed on the road shoulder and a slope protection portion 3 that is connected to the shoulder protection portion and slopes downward, the slope protection portion is provided. 3 (referred to as “inclined surface” hereinafter) 4 is a water flow decelerating groove that reduces the speed at which rainwater flowing down the inclined surface 4 flows out of the lower edge 5 at a position close to the lower edge 5. The above-mentioned problem is solved by providing 8 to protrusions 14.

  The water flow deceleration groove 8 or the protrusion 14 may be a groove or a ridge that continues along the lower edge 5 of the slope protecting portion 3, or a groove or a ridge that extends along the lower edge 5 in an intermittent manner. There may be. Only one groove or ridge may be provided in the vicinity of the lower edge of the slope protection section 3, but a plurality of grooves or protrusions are preferably provided in parallel. The groove or ridge preferably has a shape having a low wall surface 10 in a direction in which water flowing on the inclined surface is dammed in a cross section obtained by cutting the block parallel to the direction of water flowing on the inclined surface 4. .

  Scouring occurs along the lower edge 5 of the slope protection part because the speed of the water flowing along the smooth sloped surface 4 of the slope protection block is large and the soil slope 17 is impregnated with water. The rainwater that flowed down the inclined surface 4 at the part immediately below the lower edge 5 of the slope protection part is rapidly decelerated, and the energy of the water flow lost at that time is washed away by the soil. It is thought to happen. Therefore, by reducing the speed at which the water flowing through the inclined surface 4 flows out from its lower edge, scouring that occurs immediately below the lower edge of the slope protection block 1 cannot be completely prevented. By appropriately designing the water flow decelerating grooves 8 to the protrusions 14, it can be considerably reduced.

  According to physics knowledge, the energy of the flowing water flowing on the inclined surface 4 is determined by the flow rate and the flow velocity, and is considered to be proportional to the square of the flow velocity. Since the flow rate is determined by the amount of rainfall, it cannot be artificially changed unless a special drainage structure is provided on the road. On the other hand, with respect to the flow velocity, the water flow reduction grooves or protrusions as described above are provided on the inclined surface 4 of the block to increase the flow resistance of the inclined surface 4 or flow down near the lower edge of the inclined surface 4. By providing the water flow decelerating grooves 8 or protrusions 14 that convert the velocity energy of the water flow into the velocity energy of the vortex and decelerate, the scouring of the slope immediately below the lower edge of the slope protection block 1 can be reduced.

  In a road with a slope that slopes downward from the shoulder of the road, in order to protect the shoulder and the upper part of the following slope, a slope protection block is installed to cover the road shoulder and the upper part of the slope. By adopting the shape or structure of this device, it is possible to reduce the scouring of the soil slope immediately below the lower edge of the block without providing a special drainage structure on the road. The maintenance cost can be reduced.

Perspective view of the first embodiment An enlarged cross-sectional view showing an example of a cross section of a water flow reduction groove Expanded sectional view showing another example of the cross section of the water flow deceleration groove Perspective view showing molding of block by slip foam method Plan view of the factory forming block of the first embodiment Front view of the block of FIG. Side view of the block of FIG. Plan view of the factory forming block of the second embodiment Front view of the block of FIG. Side view of the block of FIG. Plan view of the factory forming block of the third embodiment Plan view of the factory forming block of the fourth embodiment Plan view of the factory forming block of the fifth embodiment Front view of the block of FIG. Side view of the block of FIG. A perspective view of a conventional slope protection block

  FIG. 1 is a perspective view of a main part showing an example of a road provided with a slope protection block according to the present invention. The slope protection block 1 provided on the road shoulder is composed of a road shoulder protection part 2 having a horizontal upper surface, and a slope protection part integrated with the road shoulder protection part or connected to the road shoulder protection part with a metal fitting or the like. 3 is provided. The surface of the slope protection part 3 is an inclined surface 4 that is inclined downward from the road shoulder protection part 2.

  In the vicinity of the lower edge of the inclined surface 4 of the slope protection block 1 of the first embodiment shown in FIG. 1, one continuous water flow reduction groove 8 is provided in parallel with the lower edge 5. As shown in FIG. 2, the cross section of the water flow deceleration groove 8 has a shape including a collision surface 10 in a direction for blocking water flowing down the inclined surface 4. As shown in FIG. 3, the collision surface 10 can be formed with a high height by the groove 8 and the protrusion 11 provided below the groove 8.

  The grooves 8 or the ridges 11 parallel to the lower edge 5 of the slope protection block can be formed on the construction site by the slip foam method. FIG. 4 is a view showing an example in which the groove 8 is formed by the slip foam method, and the template 21 having a shape corresponding to the surface shape of the slope protection block 1 is slid along the surface of the concrete cast on the spot. Thus, the surface of the slope protection block including the groove 8 is formed. If a plurality of bent portions 22 for forming the grooves 8 are provided, a plurality of parallel grooves can be formed, and if the bending directions of the bent portions 22 are reversed, a protrusion can be formed.

  The slope protection block 1 can also be constructed by forming blocks of a predetermined length at a factory and placing them on a construction site. 5 to 7 are views showing an example of a factory forming block used for the construction of the slope protection block 1 of FIG. 1, FIG. 5 is a plan view, FIG. 5 is a front view, and FIG. 7 is a side view. For attaching metal fittings for connecting adjacent factory molding blocks to both ends of the edge on the anti-slope protection portion side of the road shoulder protection portion 2 of the factory molding block and both ends of the lower edge 5 of the slope protection portion 3 shown in the figure. An insert nut 6 is embedded. The length L in the road extending direction of the factory forming block 1 in the figure is about 2 m.

  A plurality of water flow reduction grooves 8 can be provided at a position near the lower edge 5 of the inclined surface 4, or a plurality of water flow reducing grooves 8 can be provided distributed over the entire inclined surface 4. The factory forming block of the second embodiment shown in FIGS. 8 to 10 is formed by arranging a plurality of continuous linear water flow deceleration grooves 8 shown in the first embodiment on the inclined surface 4 at equal intervals. 8 is a plan view, FIG. 9 is a front view, and FIG. 10 is a side view.

  The road shoulder protection block of the second embodiment is different from that of the first embodiment in the cross-sectional shape of the road shoulder protection portion 2. That is, the slope protection block of the second embodiment is provided with a step 13 on the inclined surface 4 side of the surface of the shoulder protection portion 2, and the road on which the slope protection portion 3 side of the step 13 protrudes from the road surface. It has become a curb.

  The water flow deceleration groove 8 can also be formed as a shape that is bent continuously in the extending direction of the lower edge 5 or as a set of grooves with short breaks. FIG. 11 is a plan view showing the factory forming block of the third embodiment, and is an example in which the plurality of water flow deceleration grooves 8 of the second embodiment are bent grooves having a continuous U-shape. FIG. 12 is a plan view showing the factory forming block of the fourth embodiment, and is an example in which the water flow deceleration groove 8 of the second embodiment is a refractive groove having a continuous V-shape.

  13, FIG. 14 and FIG. 15 are a plan view, a front view and a side view showing the fifth embodiment, where the cross-sectional shape of the road shoulder protecting portion 2 is the same as that of the second embodiment, and The different formation modes are shown. In the block of the fifth embodiment, the water flow reduction grooves 8 are formed between the projections 14... By the discontinuous crescent-shaped projections 14. is doing. The protrusions 14 are distributed in a staggered manner on the inclined surface 4, and the water flow deceleration grooves 8 formed between the protrusions 14 are zigzag-shaped.

  The action of the water flow deceleration groove 8 of the fifth embodiment is not that the water flow collides with the wall surface 10 of the groove to decelerate the water flow as in the first embodiment, but the water flow zigzags on the inclined surface 4. , Or on the protrusions 14..., And by repeating the flow falling into the water flow deceleration groove 8, the velocity energy of the water flow is reduced, thereby decelerating.

  Although the first to fifth embodiments have been described above, the shape and structure of the water flow deceleration grooves 8 to the protrusions 14 in the slope protection block of the present invention are limited to those shown in the first to fifth embodiments. Instead, the water flow flowing down the inclined surface 4 is provided in the inclined surface 4 by colliding with the wall surface of the groove extending continuously or intermittently in the extending direction of the lower edge 5 of the block. By flowing the grooves flowing through the surface in a zigzag manner in a planar or three-dimensional manner, the velocity of the water flow flowing out from the lower edge of the inclined surface 4 by absorbing the energy of the water flow is reduced. Various shapes and structures other than those shown in the embodiments can be adopted as long as the shapes and structures are decelerated to such an extent that scouring of the soil slope immediately below can be effectively reduced.

3 Slope protection section 4 Inclined surface 5 Lower edge 8 Water flow reduction groove
10 Wall surface
14 Protrusions

Claims (5)

  A horizontal road shoulder protection part (2) and a slope protection part (3) inclined downwardly connected to the horizontal road shoulder protection part, and shallowly buried above the slope of the soil sloped downward from the road shoulder, In the slope protection block that protects the upper part of the slope and the road shoulder connected thereto, rainwater flowing down the surface (4) is located at least near the lower edge (5) of the surface of the slope protection part (3). A slope protection block, comprising a water flow reduction groove (8) or a projection (14) for reducing a speed when the liquid flows out from the lower edge (5).   The method according to claim 1, wherein the water flow reduction groove (8) is one or more continuous straight grooves provided in parallel with the lower edge (5) of the slope protection part (3). Face protection block.   The method according to claim 1, wherein the water flow reduction groove (8) is one or a plurality of bent grooves or refractive grooves extending in the extending direction of the lower edge (5) of the slope protection part (3). Face protection block.   The slope protection block according to claim 1, 2 or 3, wherein the water flow deceleration groove (8) comprises a low wall surface (10) in a direction for blocking water flowing down the inclined surface (4).   The said water flow deceleration groove | channel (8) is a zigzag-shaped groove | channel formed between many processus | protrusions (14) disperse | distributed and provided in the surface of the slope protection part (3). Slope protection block.

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