JP2002188126A - Median strip block for road - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent deformation of a median strip block for a road for a road surface sign. SOLUTION: In this median strip block (a resin block) for the road having a columnar projection 2b projecting in the upper surface direction from a bottom surface of a hollow body structure in the hollow body structure, a specific distance is imparted between a top part of the columnar projection 2b and an upper surface 1a of the hollow body structure of the resin block so that even if the columnar projection 2b is deformed by applying an excessive load of a vehicle, since there is the specific distance between the top part of the columnar projection and an upper part of a block inclined part, the block can be restored to an original shape without being influence by the deformed columnar projection.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road divider block installed at a central divider at the center of a road, and more particularly to a road divider block capable of preventing deformation.

[0002]

2. Description of the Related Art In general, a road divider block for road surface display, which is installed at a central divider at the center of a road, has a predetermined height and shape so that vehicles can get over in an emergency.
Further, there is a demand for a strength that does not cause breakage and deformation or change of the installation location when the vehicle gets on and crashes. The reason why the deformation is prevented is that it is necessary to protrude from the road surface so that the driver can recognize the deformation.

The road divider block according to the prior art has a hollow interior for weight reduction, and a reinforcing rib for reinforcement is formed inside the hollow body so as to connect the upper part and the lower part of the hollow body. .

[0004] Incidentally, as a document describing the technology relating to the road divider block, there is, for example, Japanese Utility Model Laid-Open No. 7-290.
05, JP-A-8-158324, JP-A-1
No. 83544.

[0005]

The road divider block according to the prior art is lightweight and has a predetermined strength. However, it is deformed when a large load is applied due to a large vehicle getting on or a collision. There was a possibility that it did not return to the shape. That is, in the conventional road divider block, when an excessive load is applied, the reinforcing ribs inside the block are deformed and do not return to the original shape because the reinforcing ribs are integrally formed with the block surface. In addition, there is a problem that stress is concentrated on a joint portion with the reinforcing rib and a crack may be generated.

In order to increase the strength of the block, there has been proposed a block provided with a plurality of reinforcing ribs including vertical and horizontal ribs inside the block. However, the weight becomes excessively large, and the transport, installation and removal are difficult. There was a problem that there was.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned disadvantages of the prior art, and is a light-weight road separator strip block for road surface display that can easily return to its original shape even under a load. It is to provide.

[0008]

In order to achieve the above object, a road separator block according to the present invention is a hollow resin block having a substantially trapezoidal cross section having a plurality of columnar projections on the bottom surface of the hollow structure. The first feature is that, in the road separator block, the columnar protrusion extends in the direction of the upper surface of the hollow body structure of the resin block, and the second feature is that in the road separator block, The third feature is that the top of the protrusion has a certain distance from the upper surface of the hollow structure of the resin block, and the upper portion of the hollow is restricted from being deformed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a description will be given of a road separator block according to an embodiment of the present invention. First, the principle of the road separator block according to the present invention will be described. FIG. 4 is a diagram for explaining the principle of a road divider block according to the present invention, and FIG. 5 is a diagram for explaining a road divider block according to the prior art as compared with FIG.

In the prior art road divider block 9 shown in FIG. 5, as described above, when an excessive load is applied by a large vehicle or the like, the reinforcing rib 9b inside the block may be deformed by buckling. is there. After the vehicle or the like has left, the road divider block 9 is provided with a block upper surface 9a.
Even if the restoring force (elastic force) for restoring to the original shape remains, the reinforcing rib 9b is attached to the block upper surface 9a.
In some cases, the reinforcing ribs 9b formed integrally with the upper surface 9a prevent the block upper surface 9a from being restored, and the entire road divider block may not return to the original shape. Further, the upper surface 9a of the block is formed by the load.
Concentration generated at a joint portion between the block and the reinforcing rib may cause a crack on the block upper surface 9a.

On the other hand, the road divider block 1 according to the present invention has a columnar projection 2b projecting from the bottom surface of the hollow body structure of the block to the upper surface. For this reason, the road divider block 1 according to the present invention has buckles 2e on the columnar projections 2 as shown in FIG.
Even if the remaining shape is deformed, the block upper surface 1a can be quickly restored by the restoring force, the whole shape of the road divider block can return to the original shape, and cracks are hardly generated.

Hereinafter, an embodiment of a road divider block according to the present invention will be described in detail. FIG. 1 is a diagram showing a plane and side surfaces of a road divider block according to the present embodiment in a road installation state, and FIG. 2 is a diagram showing a plane, side surfaces, and a bottom surface of the road separator block in a non-road installation state. 3 is FIG.
FIG. 3 is a view for explaining a cross-sectional structure of FIG.

FIG. 1 is a top view of a road divider block 1 according to the embodiment shown in FIG.
(A) As shown in FIGS. 1 (B) and 1 (C) showing a lateral side surface, a hollow buried anchor 5 for fixing to a road surface in a trapezoidal shape and a rectangular side surface, and a buried anchor passing therethrough. 5, a bolt 3 passed through a through hole communicating with
Is provided with a flat washer 4 and a cap 6 for covering and protecting the upper part of the bolt 3. The buried anchor 5 is inserted into a block mounting hole on a road surface (not shown).
The bolt 3 is screwed through the bolt 3 and the upper part of the bolt 3 is covered with a cap 6 so as to be fixed to the road surface.

The material of the road separator block according to the present embodiment is a high-density polyethylene, which has a characteristic of a density of 0.949 g / cm ² (test method: JIS K67).
60 standards), and the tensile breaking strength is 45 MPa (test method:
JIS K6760 standard), tensile elongation at break is 900%
(Test method: JIS K6760 standard), Izod impact value is 49 kJ / m ² (Test method: JIS K7110)
Standard) is preferable, but a resin such as low-density polyethylene or polyurethane may be used. These are molded by a method such as blow molding.

FIG. 2 is a diagram showing the outer shape of only the road divider block 1, and FIG. 2 (A) showing the upper surface, FIGS. 2 (B) and 2 (C) showing the lateral side surface, and the bottom surface. FIG.
The shape is as shown in (D). As shown in FIG. 2 (D), the bottom surface of the road separator block 1 itself has two through holes 7 for penetrating the bolts 3 and a number of shapes (annular, annular, etc.) for preventing slippage with the road surface. A plurality of anti-skids 10 (vertical bar-shaped, horizontal bar-shaped) are arranged also as columnar projections to be described later, and increase the resistance of side slip due to external pressure after being installed on a road surface.

A road divider block 1 according to the present embodiment.
Will be described with reference to FIG. FIG.
FIG. 3D is a view showing an AA cross section, and FIG. 3B is a view showing the same BB cross section.

First, as shown in FIG. 3A, the columnar projection 2a on the left side projects from the bottom surface toward the inclined side surface of the block, and the AA section of the road separator block 1 according to the present embodiment as shown in FIG. The columnar projections 2b protrude from the bottom surface of the block relative to the hollow structure ceiling (upper surface). That is, this block has an inner hollow body structure as shown in FIG.
(D) The annular top of the small-diameter non-slip 10 protrudes in the direction of the slope of the hollow structure of the block, and the annular top of the large-diameter non-slip 10 is the ceiling of the hollow structure of the block ( (Upper surface) to restrict deformation of the upper surface of the hollow body structure.

Further, as shown in FIG. 3B, a cross section taken along the line BB of the road divider block 1 according to this embodiment is shown in FIG.
Like the small-diameter non-slip 10 of (D), the columnar projection 2d having an annular top protrudes in the direction of the inclined portion of the hollow structure of the block, and has a structure that restricts deformation of the upper surface of the hollow structure. .

As described above, in the road divider block 1 according to the present embodiment, the non-slip 10 forming a part of the bottom surface protrudes toward the inclined portion and the upper portion (ceiling portion) of the hollow body structure inside the block. When the top of the projection has a certain distance from the inclined part and the upper part (ceiling part) of the hollow structure inside the block, when an excessive load is applied, first the upper part of the block bends to absorb the impact, and then By suppressing the deformation of the upper surface of the bent block by the top of the columnar projection,
The amount of deflection is limited to a certain amount to prevent the upper surface of the block from being broken, and furthermore, when the load is removed, the block is quickly restored to its original shape.

Further, in the road divider block 1 according to the present embodiment, even when the columnar projections buckle due to the load, the upper surface of the block is not affected at all by the buckled columnar projections and can return to the original shape. It is possible. In addition, since the columnar projection is not connected to the upper surface of the hollow body structure, there is no stress concentration at the connection portion when a load is applied, thereby preventing the upper surface of the hollow body structure from cracking.

[0021]

As described above, the road divider block for road surface display according to the present invention has columnar projections projecting from the bottom surface of the hollow body structure toward the upper surface in the hollow body structure, and the top of the columnar projections. Even if the columnar projection is deformed by applying a certain distance between the block and the upper part (ceiling) of the block, the upper surface of the block will have no effect on the deformed columnar projection Instead, it can quickly return to its original shape. In addition, it is possible to prevent a crack from being generated in the connection portion.

[Brief description of the drawings]

FIG. 1 is a view showing a plane and a side surface of a road separation strip block according to an embodiment of the present invention in a road installation state.

FIG. 2 is a diagram showing a plane, a side surface, and a bottom surface of the road divider block in a state where a road is not installed.

FIG. 3 is a view for explaining a cross-sectional structure of the road divider block of FIG. 2;

FIG. 4 is a diagram for explaining the principle of a road divider block according to the present invention.

FIG. 5 is a view for explaining a road divider block according to the prior art as compared with FIG. 4;

[Explanation of symbols]

1: road divider block, 2: columnar projection, 3: bolt, 4: flat washer, 5: buried anchor, 6: cap,
7: Through hole, 9: Road divider block, 2a to 2e:
Columnar projections.

Claims (3)

[Claims] 1. A road separator strip, comprising a hollow resin block having a substantially trapezoidal cross section having a plurality of columnar projections on the bottom surface of the hollow body structure. 2. The road divider block according to claim 1, wherein the columnar protrusion extends in the direction of the upper surface of the hollow structure of the resin block. 3. The structure according to claim 2, wherein the top of the columnar projection has a predetermined distance from the top surface of the hollow body structure of the resin block so as to limit deformation of the upper portion of the hollow body. Road divider block.