JP2961193B2 - Road protection fence - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective fence for a road, which is disposed on a road edge or a median strip of a road in parallel with a direction in which the road extends.

[0002]

2. Description of the Related Art Roads where vehicles frequently travel usually have
Protective fences are laid on the roadside and the median to prevent vehicles from jumping out of the roadway beyond the roadside and entering the oncoming lane beyond the median.

[0003] Conventionally, a protective fence laid for the above purpose has a base wall having a wide bottom portion and a fence laminated on the base wall, which are integrally formed of concrete. It is laid by burying the bottom of the wall in the soil. In such a conventional protective fence, since the foundation wall and the fence body are integrally formed, when the vehicle collides with the fence body, the impact due to the collision is attenuated in an arc shape around the collision point as a whole around the collision point. While spreading, the impact force is concentrated at the collision point. Therefore, the impact force is very large, and the vehicle is significantly damaged, and the concrete fragments are scattered on the roadway, thus hindering the traffic of other vehicles.

In order to solve such inconveniences, Japanese Utility Model Laid-Open No. Hei 5-10013 discloses a fence provided with a protective fence on the ground and a fence superimposed on the top of the base wall. A protective fence that is separated and has a cushioning material interposed between the opposing surfaces of the foundation wall and the fence body, and has a steel rod embedded in both the foundation wall and the fence body at the center in the width direction. Proposed.

In such a protective fence, when the vehicle collides with the fence, the steel rod is bent by the impact and the fence is inclined. Therefore, the inclination of the fence and the compression elasticity of the cushion material are increased. The deformation consumes the energy of the collision, thereby alleviating the impact due to the collision of the vehicle, suppressing the occurrence of a major accident, and preventing the scattering of concrete pieces.

[0006]

SUMMARY OF THE INVENTION
In the protective fence described in Japanese Patent No. 10013, the base wall and the fence body are connected to each other by a steel rod extending in the vertical direction at the center in the width direction. The body bends around a steel rod at the boundary between the foundation wall and the fence body. Due to this bending, the impact force due to the collision acts as an internal stress on a half part in the width direction of the foundation wall and the fence body, and a stress distribution is formed such that the internal stress gradually increases from the center to the edge. However, almost no internal stress occurs in the other half in the width direction.

Therefore, when the vehicle collides with the fence, the fence becomes only half as a part of absorbing the impact force in response to the collision, and the maximum of the base wall and the edge of the fence is correspondingly increased. Since the internal stress becomes very large, the edges of the foundation wall and the fence body are easily damaged, and there is a problem that once a collision accident occurs, it is very difficult to restore the protection fence.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and the internal stress distribution of the foundation wall and the fence when the vehicle collides with the fence over the entire length in the width direction. As a result, the degree of concentration of stress at the edges of the foundation wall and the fence can be reduced, thereby more effectively absorbing the impact at the time of a vehicle collision and preventing damage to the foundation wall and the fence. The purpose of the present invention is to provide a protective fence for a road.

In addition, the present invention ensures that even when a vehicle collides with a protective fence, only the fence is damaged without breaking the foundation wall, and thus the foundation wall is reused by replacing only the fence. The purpose of the present invention is to provide a road protection fence capable of shortening the time required for on-site construction and minimizing traffic congestion.

[0010]

According to a first aspect of the present invention, there is provided a road protection fence provided on a road end and / or a median strip of a road in a direction in which the road extends. A protective fence, comprising: a base wall disposed on the surface of one or both of a roadside and a median strip; and a fence body superimposed on the top of the base wall; A buffer for absorbing the impact of a vehicle collision with the fence is provided between the fence and the fence, and the buffer is provided between the base wall and the fence on both sides in the width direction. An arc-shaped leaf spring interposed in the portion, a connecting member for connecting the base wall and the fence body while penetrating the arc-shaped leaf spring, and a connecting member connecting the base wall and the fence body while penetrating the arc-shaped leaf spring. A connecting member for connecting the base member and the fence body; and the connecting portion provided on the base wall. It is characterized in that the and a and prevents upward movement of the box that houses the lower end of the connecting member so as to permit downward movement.

[0011] According to this road protection fence, the fence body is stacked on the top of the foundation wall via the buffer provided with the arcuate leaf spring, which is an elastic body. When a collision occurs with the fence of the protective fence arranged in the fence, the fence is in a state of falling from the collision surface to the direction of the opposite surface from the collision surface due to the impact, and the arcuate plate at this time The impact force of the collision is absorbed by the elastic deformation of the spring, which makes it possible to minimize the collision accident of the vehicle.

Since the arc-shaped leaf springs are provided on both sides in the width direction between the foundation wall and the fence, the fence is normally connected to the top of the foundation wall in a stable state. When the collision occurs, the arc-shaped leaf spring on the opposite side of the collision surface is elastically compressed, thereby distributing the internal stress distribution of the fence and the foundation wall in the width direction of the fence and the foundation wall. Will occur over a period of time. Therefore, when the foundation wall and the fence are joined to each other by the metal member at the center in the width direction as in the conventional case, the distribution of the internal stress is reduced to half the thickness of the fence and the foundation wall in the width direction. In this case, stress concentration occurs at the edges of the fence and the foundation wall on the widthwise front end side, thereby avoiding the disadvantage that the fence and the foundation wall are easily damaged by the concentration of the stress.

According to a second aspect of the present invention, there is provided a road fence.
The road protection fence according to claim 1, wherein the foundation wall and the fence body are precast products formed in advance so that they can be assembled on site.

According to this road protective fence, the base wall and the fence are carried to the site, and the base wall is first disposed at a predetermined position along the road, and then the fence is connected to the base wall via an arc-shaped leaf spring. Since the protective fence is completed by stacking on the top of the building, the rate of on-site construction is greatly reduced, thereby ensuring rapid construction work. Therefore, traffic congestion due to construction can be minimized.

The road fence according to claim 3 of the present invention comprises:
3. The protective fence for a road according to claim 1, wherein the foundation wall is made of concrete and formed to spread downward in the width direction.

According to this road protection fence, since it is made of concrete and has a considerable weight and its lower part is widened downward, the foundation wall can be stably left at a predetermined position in a stable state. it can.

According to a fourth aspect of the present invention, there is provided a road protection fence comprising:
The road fence according to claim 3, wherein the foundation wall is
It has a concave groove on the bottom surface.

According to this road protection fence, a base member is previously embedded in a predetermined mounting surface of a road with a projecting member such as a stake or a ridge corresponding to the concave groove on the bottom surface of the base wall. By fitting the concave groove to the projecting member at the time of laying the wall, the laying state of the foundation wall is stabilized, and lateral displacement in the road surface width direction can be reliably prevented.

The road fence according to claim 5 of the present invention comprises:
The road protection fence according to claim 3 or 4, wherein the foundation wall has a through-hole penetrating vertically.

According to this road protection fence, the foundation wall is laid by previously embedding a projecting member such as a pile corresponding to a through hole penetrating the foundation wall in a predetermined mounting surface of the road. At times, the through hole is externally fitted to the projecting member, whereby the laid state of the foundation wall is stabilized, and lateral displacement in the road surface width direction can be reliably prevented.

According to a sixth aspect of the present invention, there is provided a road protection fence comprising:
The road fence according to claim 1, wherein the foundation wall is
It is characterized by being formed integrally with a viaduct of a viaduct.

According to this road protective fence, since the viaduct has a function as a foundation wall, a fence body can be provided at the height of the wall.

The road fence according to claim 7 of the present invention comprises:
3. The road protection fence according to claim 1, wherein the fence comprises a plurality of poles erected on a foundation wall at a predetermined pitch and a guardrail connecting the plurality of poles. Is what you do.

According to this road protective fence, the conventional guardrail has a disadvantage that it is weak against impact force and is damaged immediately upon collision of a vehicle, and the pole is buried directly in the soil or through concrete. This eliminates the inconvenience of requiring troublesome replacement work at the time of breakage, and has the advantage of allowing immediate replacement at the time of breakage. That is, the pole can be shortened by the height of the foundation wall, and the collision force can be absorbed by the arc-shaped leaf spring, so that the proof strength of the guardrail can be improved. It is possible to replace only the guardrails as it is, shortening the on-site construction period, helping to alleviate traffic congestion, and reducing the cost of repairs. Further, in addition to these, the landscape of the fence body can be improved in design.

[0025] The road protection fence according to claim 8 of the present invention comprises:
The road fence according to claim 1 or 2, wherein the fence body is formed in a plate shape corresponding to the foundation wall.

According to this protective fence for roads, the scenery of the fence body becomes heavy.

According to a ninth aspect of the present invention, there is provided a road protection fence comprising:
The road protection fence according to claim 7 or 8, wherein the fence body is made of a synthetic resin.

According to the road protection fence, the weight of the fence body can be reduced.

According to a tenth aspect of the present invention, there is provided the road protection fence according to the ninth aspect, wherein the synthetic resin is obtained by regenerating waste of a synthetic resin product. It is characterized by the following.

According to this road protection fence, resources can be effectively used.

The road protection fence according to claim 11 of the present invention is the road protection fence according to claim 7 or 8, wherein the fence is made of fiber rain hosed concrete in which a fiber material is kneaded into concrete. It is characterized by having.

According to this road protective fence, the concrete is solidified in a state where the concrete is reinforced by the fibrous materials dispersed vertically and horizontally therein, so that the crack of the fence body is reliably prevented.

According to a twelfth aspect of the present invention, there is provided a road protective fence according to the seventh or eighth aspect, wherein the fence body is made of fiber-reinforced hose made by kneading a fiber material into a synthetic resin. It is characterized by being.

According to the guard fence, the synthetic resin is reinforced with fiber materials dispersed vertically and horizontally inside to solidify into a fiber-reinforced hose, so that the fiber-reinforced hose is used. The fence can be reduced in weight while ensuring sufficient strength to cope with a collision.

According to a thirteenth aspect of the present invention, there is provided a road protection fence according to the eleventh or twelfth aspect, wherein the fiber material is one of steel fiber, plastic fiber, glass fiber and carbon fiber. Or a combination of two or more.

According to this protective fence, many fiber materials made of steel fiber, plastic fiber, glass fiber or carbon fiber have a large tensile strength, and therefore, a fiber into which these fiber materials having a large tensile strength are kneaded. Rain hosed concrete and fiber rain hosed plastic have higher strength than those without kneading these fiber materials.

According to a fourteenth aspect of the present invention, there is provided the road protection fence according to the thirteenth aspect, wherein the plastic fiber is made of polyethylene, polypropylene, polyvinyl chloride, polyvinyl alcohol, polyester, or polyamide. It is one of the features.

According to this protective fence, polyethylene, polypropylene, polyvinyl chloride, polyvinyl alcohol, polyester, or polyamide is excellent in tensile strength as a fibrous body, so that it can be kneaded with fiber-reinforced hose concrete or fiber-reinforced hose plastic. It is suitable as a fiber material to be embedded.

According to a fifteenth aspect of the present invention, in the road fence according to the tenth aspect, the synthetic resin is polyethylene terephthalate.

According to this protective fence, polyethylene terephthalate is a synthetic resin rich in rigidity and toughness,
Excellent as a material for fences subject to vehicle collisions. Further, it is possible to recycle so-called PET bottles made of polyethylene terephthalate, which contributes to effective use of resources.

According to a sixteenth aspect of the present invention, in the road fence according to the ninth aspect, the synthetic resin is an epoxy resin.

According to this protective fence, the epoxy resin is rich in toughness and is excellent as a material of a fence body subjected to a collision of a vehicle. In addition, since a curing agent reacts and cures at room temperature by mixing with a curing agent, the production of the fence body is facilitated.

According to a seventeenth aspect of the present invention, there is provided a road protection fence according to any one of the first to sixteenth aspects, wherein the fence body is provided on one end face in the longitudinal direction. A bulged portion having a bulged portion is formed, and a concave portion sized so as to fit into the bulged portion is formed on the other end surface.

According to this road protection fence, the bulge on the end face of one fence fits into the recess of the other fence adjacent to the fence with the fence constructed. Since the fences are prevented from laterally displacing each other, even if the vehicle collides with the connecting part of the fences, the respective fences will be in a complementary state, and the end of each fence will be The inconvenience of weakening in strength is reliably avoided.

[0045] The road protection fence according to claim 18 of the present invention is the road protection fence according to any one of claims 1 to 16, wherein the road protection fence is provided at a portion facing the one fence and the other fence. ,
A connection member for connecting the respective fences is provided.

According to this road protection fence, with the fence constructed, the end of one fence and the end of the other adjacent fence are connected by a connecting member. Are in a state in which lateral displacement is prevented from each other, so that even if the vehicle collides with the connecting part of the fences, the respective fences complement each other, thereby partially closing the end of each fence. The inconvenience of breakage is reliably avoided.

The road protection fence according to claim 19 of the present invention is the road protection fence according to claim 1, 2, 3, 4, 5, 6, 7, 11, 17 or 18, , Made of prestressed concrete.

According to this road protective fence, since the prestressed concrete is compressed in advance and stress is formed inside, when the vehicle collides with the fence, the prestressed concrete can easily cope with the elongation due to the collision. And the scattering of concrete pieces is reliably suppressed.

According to a twentieth aspect of the present invention, there is provided a road protective fence according to any one of the first to nineteenth aspects, wherein the base wall and the fence are connected to each other in a longitudinal direction. The parts are arranged so as to be shifted from each other so as not to be overlapped vertically.

According to this road protective fence, the fences adjacent to each other at the joint are connected to the same foundation wall at the lower part. The impact applied to the end of the base is received by the same base wall at the bottom. Therefore, the disadvantage that the entire guard fence is displaced at its end is avoided.

[0051]

FIG. 1 is a partially cutaway perspective view showing a first embodiment of a road protection fence according to the present invention.
Is a sectional view taken along line AA. Hereinafter, the XX direction in FIG. 1 is referred to as a width direction, and the YY direction is referred to as a direction in which a road extends (road direction). As shown in these figures, a road protection fence 1 is stacked on a base wall 2 laid on a protection fence laying surface R such as a road end of a road or a median strip, and an upper surface portion of the base wall 2. It has a basic configuration including a fence 3 and a buffer 4 interposed between the fence 3 and the foundation wall 2.

The base wall 2 has a bottom surface that is in contact with the protective fence laying surface R, is elongated in the direction of the road, and is swelled integrally with an upper portion of the base portion 21. And a wall portion 22 having the same length and a mountain shape in side view. In the present embodiment, the base wall 2 is made of reinforced concrete, and has a frame in which a reinforcing bar 23 is arranged in a three-dimensional shape of the base wall 2. A plurality of pairs of suspenders 24 in the width direction are buried at a predetermined pitch in the road direction on the inclined surface of the wall portion 22 of the foundation wall 2 (only one suspender 24 is illustrated in FIG. 1). The upper end arc portion 24 a of the 24 is exposed to the outside from the surface of the wall portion 22.

The fence 3 is set to have the same length as the base wall 2 and is stacked on the top of the wall 22 so as to extend in the direction of the road corresponding to the base wall 2. The fence body 3 is also made of reinforced concrete, has a reinforcing bar 31 as a framework inside, and a plurality of suspension bars 32 are buried at the top at a predetermined pitch in the direction of the road (in FIG. 1, one suspension bar). Only the streaks 32) are drawn.
Has an upper end arc portion 32a protruding outside from the top surface.

The vertical and horizontal dimensions of the bottom surface of the fence body 3 are set to be the same as the vertical and horizontal dimensions of the top surface of the wall portion 22 of the foundation wall 2, and are formed in a mountain shape in a side view.
Thus, the front and back surfaces of the wall portion 22 of the base wall 2 and the fence 3 extending in the road direction are made flush.

Each of the above-mentioned suspension bars 24, 32 holds the foundation wall 2 and the fence body 3 by a work machine (not shown) such as a unic car or a crane truck when the protection fence 1 is laid on the protection fence laying surface R. The projecting amounts of the upper end arc portions 24a and 32a are set so that the hooks of the crane of the working machine can be locked to the suspension bars 24 and 32.

The buffer section 4 is interposed between the upper part of the foundation wall 2 and the lower part of the fence body 3, and details thereof are shown in FIGS. 3 and 4 are perspective views showing a first example of the buffer section 4, FIG. 3 is an exploded perspective view, and FIG. 4 is an assembled perspective view. The XX direction in FIGS. 3 and 4 is referred to as a width direction, and the YY direction is referred to as a road direction.

As shown in these figures, the buffer portion 4 is provided with a spring receiving base 41 buried on the upper surface side of the wall portion 22 of the foundation wall 2.
And a threaded pipe 42 buried in the fence body 3 facing the spring pedestal 41, and interposed between the base wall 2 and the fence body 3 on both sides in the width direction on the spring pedestal 41. A pair of arc-shaped leaf springs 43, a pair of anchor bolts (connection members) 44 for connecting the spring receiving base 41 and the threaded pipe 42 via the pair of arc-shaped leaf springs 43, and the screw And a support plate 45 that is entirely welded to the installation pipe 42.
The arc-shaped leaf spring 43 has a long hole 43a extending in the direction of the road at the center, and the lower portion of the anchor bolt 44 is inserted into the long hole 43a.

The spring receiving base 41 is formed of a metal plate such as stainless steel whose width dimension is set to the same dimension as the upper surface width dimension of the wall portion 22 of the base wall 2. A spring receiving recess 41a for receiving the arc-shaped leaf spring 43 is provided in a recessed manner. This spring receiving recess 41a
Has a width dimension substantially equal to the width dimension of the arc-shaped leaf spring 43, and the dimension extending in the road direction is set to be slightly larger than the dimension between both sides of the arc-shaped leaf spring 43. The arc-shaped leaf spring 43 is mounted on the spring receiving recess 41a in a state where both sides thereof are substantially in contact with the inner edge of the spring receiving recess 41a extending in the width direction.

Further, the spring receiving base 41 has four anchor rods 46 by welding at the bottoms extending downward from the four corners, and these anchor rods 46 are provided on the base wall 2. By being buried in the wall portion 22, the surface is flush with the surface (FIG. 4), and is fixed to the top surface of the wall portion 22.

A pair of steel plates 47 in the width direction corresponding to the spring receiving recesses 41a are attached to the back surface of the spring receiving base 41 by welding. Openings 47a are formed on the outer side surfaces of these boxes 47 in the width direction. The opening 47a is flush with the front wall and the back wall of the wall 22 in a state where the box 47 is embedded in the wall 22 of the base wall 2, whereby the anchor bolts in the box 47 are formed. The fastening operation of 44 can be performed from the outside.

The spring receiving recess 41a has an elongated hole 41b extending in the direction of the road at the center thereof, and the anchor bolt 44 inserted into the elongated hole 43a of the arc-shaped leaf spring 43 in the elongated hole 41b. Of the anchor bolt 44, and a nut 48 is screwed into a portion of the anchor bolt 44 projecting downward from the spring receiving recess 41a via a washer 48a.

The threaded pipe 42 is formed by threading a female screw on the inner peripheral surface, and an L-shaped anchor rod 42a is screwed into an upper opening of the threaded pipe 42. The threaded pipe 42 having such an L-shaped anchor rod 42a is buried in the fence 3 in a pair in the width direction so as to correspond to the arc-shaped leaf spring 43. In a state where the threaded pipe 42 is buried in the fence 3, the support plate 45 is made to adhere to the bottom surface of the fence 3, whereby the support plate 45 is attached to the bottom of the fence 3.
, The lower opening of the threaded pipe 42 is located.

In the anchor bolt 44, a lower threaded portion 44b is screwed below a partition area 44a formed in an annular shape at a substantially central portion, and an upper threaded portion 44c is threaded upward. And the anchor bolts 44
After the upper threaded portion 44c of the anchor bolt 44 is screwed into the threaded pipe 42, the lower threaded portion 44b of the anchor bolt 44 is elongated.
The fence body 3 is placed on the top of the foundation wall 2 via an arc-shaped leaf spring 43 so as to be inserted into the base plate 2 and then the elongated holes 41b and 43a.
After the washer 48a and the nut 48 are sequentially fitted into the lower threaded portion 44b of the anchor bolt 44 protruding into the box 47 through the opening 47a, and then the nut 48 is screwed and fastened, as shown in FIG. As shown in FIG. 4 and FIG. 4, the fence 3 is connected to the top of the foundation wall 2 via the arc-shaped leaf spring 43.

In this embodiment, the length of the base portion 21 of the base wall 2 in the road direction is set to approximately 4 m, the width is set to approximately 0.7 m, and the height is set to approximately 0.7 m. It is set to approximately 0.3 m. The wall portion 22 of the foundation wall 2 has a trapezoidal bottom width of approximately 0.7 m in a side view,
The width of the top is approximately 0.4m and the height is approximately 0.4
m. The width of the bottom of the fence 3 having a trapezoidal shape in a side view is set to about 0.4 m, the width of the top is set to 0.2 m, and the height is set to about 0.6 m. Further, the arc-shaped leaf spring 43 has a length of approximately 13 cm,
It is formed by bending a normal spring steel having a width of approximately 7.5 cm and a thickness of approximately 0.5 cm, in particular, into an arc shape having a flat central portion.

In the manufacturing plant, the reinforcing walls 23 and 31 are arranged in a predetermined form, and then the cement wall, the gravel and the sand are mixed at a predetermined mixing ratio. A so-called precast product, which is manufactured by pouring a concrete raw material kneaded by adding water to the mixture and kneading the mixture into the above-described form, and curing and then removing the form, is employed.

By adopting such a precast product, the foundation wall 2 and the fence 3 are carried to the construction site by a vehicle, and the foundation wall 2 is placed on the protective fence laying surface R of the roadside or the median strip. Then, by connecting the fence 3 to the top of the foundation wall 2 with the anchor bolts 44 via the arc-shaped leaf spring 43, the laying work of the protection fence 1 is completed, and the conventional on-site formwork and concrete casting are completed. The construction work can be omitted, and the construction period can be significantly shortened, thereby contributing to eliminating traffic congestion.

FIG. 5 is a side sectional view for explaining the operation of the protective fence 1 of the first embodiment, and shows a state in which an impact force is applied to the fence body 3 due to a vehicle collision.
As shown in this figure, it is assumed that a collision force F as shown by an arrow is applied to the fence 3 by a vehicle (not shown) colliding with the fence 3. Then, the fence 3 tries to fall to the left, but the fence 3 is connected to the foundation wall 2 by the anchor bolts 44, and the anchor bolts 44 are connected to the nuts 48.
The impact force F is defined as a counterclockwise moment with the contact point between the right nut 48 and the spring receiving base 41 as the point of action P because Acts on 3.

On the other hand, since the anchor bolt 44 is allowed to move downward with respect to the spring receiving base 41, the fence 3 receiving the collision force F is attached to the anchor bolt 4.
4 moves counterclockwise around the action point P by descending with respect to the spring receiving base 41. At this time, the left support plate 45 presses the arc-shaped leaf spring 43 downward, whereby the arc-shaped leaf spring 43 is elastically deformed to generate an urging force. Then, the tilting of the fence 3 is stopped in a state where the moment about the action point P of the biasing force and the moment about the action point P of the collision force F are balanced.

As described above, when the vehicle collides with the fence 3, the fence 3 is elastically rotated around the action point P by the elastic deformation of the arc-shaped leaf spring 43, thereby absorbing the energy of the collision. Therefore, the impact of the vehicle colliding with the fence body 3 is reduced by that much, and the degree of accident can be minimized.

Further, the collision force F acts on the fence 3 with the substantially right end of the fence 3 as an action point P, and internal stress is generated in the fence 3 over substantially the entire width thereof. The state in which the stress is dispersed is ensured, and the concentration of the stress hardly occurs. Therefore, the partial breakage of the fence 3 due to the concentration of the stress hardly occurs.

After the collision of the vehicle, the fence 3 rotates clockwise around the point of action P via the support plate 45 by the restoring force of the arc-shaped leaf spring 43, and returns to the original vertical posture.
Repair of the protective fence 1 after a vehicle collision becomes unnecessary or can be reduced slightly, so that maintenance cost can be reduced accordingly. It has been found from various tests that when the vehicle collides with the protective fence 1, the destruction of the protective fence 1 is concentrated on the fence 3. Therefore, even if the fence 3 is damaged by the collision of the vehicle, the foundation wall 2 can be used as it is, and a quick restoration work can be performed.

FIG. 6 shows a second example of the road protection fence according to the present invention.
It is a partial perspective view showing an embodiment. In this embodiment, a guardrail 35 is applied as the fence 3a of the protective fence 1a. As the base wall 2 supporting the fence body 3a, the same one as in the first embodiment is employed. The fence 3 a has a rectangular base plate 33 in plan view corresponding to the spring receiving base 41, a cylindrical pole 34 erected on the base plate 33, and a surface between the plurality of poles 34. And a guardrail 35 bridged toward the roadway side.

At the lower end of the pole 34, there are provided brace pieces 34 a, projecting radially toward the four corners of the base plate 33 and having a right-angled triangular shape in side view, and these brace pieces 34 a.
The bottom of the base plate 33 is welded to the surface of the base plate 33 so that the standing state of the pole 34 is stabilized. In addition, the guard rails 35 are formed at both ends in the vertical direction toward the roadway side, and have ridges 35a extending in a belt shape in the road direction.
And a band-shaped valley 35b formed between the upper and lower peaks 35a
Are formed in a rail shape, and the valleys 35b are fixed to the pawl 34 by being caulked with rivets. In addition, the buffer unit 4 in this embodiment
a has the same configuration as that of the first embodiment except that the threaded pipe 42 and the supporting plate 45 are not employed.

In such a fence 3a, an anchor bolt 44 projecting upward from a spring receiving base 41 of the foundation wall 2 via an arc-shaped leaf spring 43 is penetrated through the foundation plate 33, and is provided above the anchor bolt 44. The protruding portion is fixed to the wall portion 22 of the foundation wall 2 by being fastened by a nut.

According to the protection fence 1a of the second embodiment, the vehicle that has collided with the protection fence 1a is moved by the guard rail 35 of the fence 3a.
The impact force is reduced by the deflection of the guard rail 35, and the impact force is also reduced by the elastic deformation of the arc-shaped leaf spring 43 due to the tilting of the pawl 34. It is possible to reduce damage.

FIG. 7 shows a third embodiment of the road protection fence according to the present invention.
It is a partial perspective view showing an embodiment. In this embodiment, the bottom portion 21a is formed with a concave groove 210a which is recessed and recessed upward at the center in the width direction of the bottom surface and extends in the road direction. Other structures of the protective fence 1b are configured in the same manner as the protective fence 1 (FIGS. 1 to 5) of the first embodiment.

The concave groove 210a is externally fitted to a ridge R1 extending in the direction of the road, which is buried so that the upper portion protrudes upward from the protective fence laying surface R, and the concave groove 210a is fitted to the ridge R1. By being fitted, lateral displacement of the foundation wall 2a laid on the protective fence laying surface R is reliably prevented. The lateral displacement prevention effect allows the base portion 21a to withstand a larger impact force without changing the width dimension.

According to the protective fence 1b of the third embodiment, when the ridge R1 is previously constructed on the protective fence laying surface R, even if the vehicle collides with the fence body 3 due to the above-mentioned lateral displacement prevention effect.
The foundation wall 2a does not move, and it is possible to avoid the difficulty of the restoration work due to the displacement of the foundation wall 2a. In addition, by improving the horizontal proof stress, it is possible to apply the present invention to a road having a large impact force of a collision, for example, an expressway.

FIG. 8 shows a third embodiment of the road protection fence according to the present invention.
It is sectional drawing which shows the modification of embodiment. In this modification, a through hole 211a penetrating in the vertical direction is formed in the base wall 2a 'of the protective fence 1b' instead of the concave groove 210a shown in FIG. This through hole 211a is
The conical tube portion 21 formed in a part of a circle and extending downward in a truncated cone shape
2a and a straight tube portion 213a formed in a straight tube shape at the wall portion 22a.

On the other hand, the through hole 2
A pile body R2 whose lower part is buried under the protective fence laying surface R is previously erected at a portion corresponding to 11a. The height of the pile R2 from the protection fence laying surface R is set to be substantially the same as the height of the conical tube portion 212a of the through hole 211a. Then, the conical tube portion 212a is externally fitted to this pile body R2,
Further, the displacement of the base wall 2a 'is prevented by pouring the cement C from the upper opening of the through hole 211a.

As shown by the two-dot chain line in FIG. 8, the projecting dimension of the pile body R2 from the protective fence
a, it is possible to reliably prevent the movement of the base wall 2a 'without pouring the cement C, and to quickly move the base wall 2a.
The laying of a 'is realized.

FIG. 9 is an explanatory front view showing an embodiment of a method of laying the protective fences 1, 1a, 1b, 1b '. In this figure, the fence 3 is illustrated as a representative made of concrete, but also includes a fence 3 a (FIG. 6) provided with a guardrail 35. As shown in this figure, the protective fences 1, 1a, 1b, 1b 'continuously provided in series are connected to the base walls 2, 2a, 2a' in series on the protective fence laying surface R along the road.
After laying, the fences 3, 3a are stacked on the tops of the foundation walls 2, 2a, 2a 'in a state where the length is shifted by half, and the foundation walls 2, 2a, 2a' and the fences 3, 3a are connected. Buffers 4, 4
It is formed by bonding to each other via a.

As described above, the foundation walls 2 laid in series
A plurality of protective fences 1 extending in the road direction by displacing opposing portions of the side surfaces 2a and 2a '(seam portions where connecting members to be described later are interposed) and opposing portions (seam portions) of the side surfaces of the fences 3 and 3a. , 1a, 1b, 1b ', the fences 3, 3a adjacent at the seam are joined to the same base wall 2, 2a, 2a' at the bottom, whereby the vehicle is In the event of a collision with the joint of 3a, the impact applied to the end of each barrier 3, 3a can be received by the same lower base wall 2, 2a, 2a '. Therefore, the inconvenience that the entire protective fence 1, 1a, 1b, 1b 'is displaced at the end thereof in the event of a vehicle collision can be reliably avoided, and secondary traffic disasters caused by the displacement can be reliably prevented. Can be.

Hereinafter, the structure of the joint portion of the fences 3 laid in series will be described. FIG. 10 shows the adjacent fence 3
It is a partially notched perspective view which shows one Embodiment of the joint structure in the opposing part of each end part. As shown in this figure, one end face of the fence body 3 is formed with a triangular bulge 36 extending in the up-down direction and having a triangular shape in plan view, and the other end face corresponds to the bulge 36. A recess 37 is formed. Then, with the plurality of fences 3 laid in series on the foundation wall 2, each fence 3 is fitted such that the bulging portion 36 of one fence 3 is fitted into the recess 37 of the other fence 3. They are arranged and set to each other.

In this embodiment, the bulging portion 3
6 is provided with a metal bulging portion reinforcing member 38 along the bent surface, and a concave portion 37 is provided with a metal bulging portion reinforcing member 39 corresponding to the bulging portion reinforcing member 38,
By fitting the bulging portion reinforcing member 38 into the concave portion reinforcing member 39 in a state where the fences 3 are continuously provided, contact between concrete is avoided, and structural weak points at discontinuous points are eliminated. The scattering of concrete at the time of collision is prevented.

The swelling portion reinforcing member 38 has a sub-several number of anchor rods 38a buried in the fence body 3 on the back surface thereof.
In addition, the recess reinforcing member 39 also has an anchor rod 39a embedded in the fence body 3 on the rear surface thereof, and the bulging portion reinforcing member 38 and the recess reinforcing member are provided by the anchor rods 38a, 39a. 39 are prevented from falling off from the fence 3.

According to this joint structure, in the state where a plurality of fences 3 are constructed on the foundation wall 2, the bulging portion reinforcing member 38 on the end face of one fence 3 is provided with a concave portion of another fence 3 adjacent thereto. Reinforcement member 39
, Whereby the respective fences 3 are in a state in which lateral displacement is prevented from each other, so that the respective fences 3 are in a complementary state, and the ends of the respective fences 3 are weak in strength. The inconvenience of becoming is reliably avoided.

FIG. 11 is a partially cutaway perspective view showing another embodiment of the joint structure at the opposing portion of each end of the adjacent fence 3. In this embodiment, an end of one fence 3b and an end of another fence 3b adjacent thereto are connected to each other by a connecting member 5. When the connecting member 5 is used, the fence body 3b has the same thickness in the width direction at the top and bottom.

The connecting member 5 comprises a pair of connecting plates 51 extending in the vertical direction in the width direction, and a partition plate 52 for connecting the pair of connecting plates 51 to each other. The partition plate 52 is formed in a rectangular shape so as to match the cross-sectional shape of the fence body 3b in the width direction, and the center of the connecting plate 51 in the road direction is fixed to both side edges of the rectangular partition plate 52, Thus, the connecting member 5 having an H shape in a plan view is formed. Such a connecting member 5 is mounted between the adjacent fences 3b as shown in FIG. 11 with the partition plate 52 inserted between the end faces of the adjacent fences 3b.

According to the joint structure of this embodiment, the fence 3
b, the end of one fence 3b and the end of another adjacent fence 3b are connected by the connecting member 5, and the respective fences 3b are prevented from laterally displacing each other. Therefore, even if the vehicle collides with the connecting portion of the fence 3b, the respective fences 3b are in a mutually complementary state, whereby the end of each fence 3b is partially damaged. Inconvenience is reliably avoided.

A plurality of anchor rods extending in the direction of the road are protruded from one surface of the partition plate 52, and the anchor rods are buried in one of the fences 3b from the end faces to connect the connecting member 5 to the fence 3b. It may be fixed in advance. By doing so, it is not necessary to separately prepare the connecting member 5 separately from the foundation wall 2 and the fence 3b, the number of components at the time of construction is reduced, and on-site construction is facilitated.

As described in detail above, the protective fence 1 of the present invention
1a, 1b, 1b 'are the base walls 2, 2a,
2a 'and fences 3, 3a, 3b superimposed on tops of the foundation walls 2, 2a, 2a'.
a, 2a 'and the fences 3, 3a, 3b are provided with shock absorbers 4, 4a for absorbing the impact of the collision of the vehicle with the fences 3, 3a, 3b in a state where the both are connected. Parts 4, 4a
Is configured to include arcuate leaf springs interposed between the base walls 2, 2a, 2a 'and the fences 3, 3a, 3b on both sides in the width direction, so that the fences 3, 3a, 3b Are connected to the base walls 2, 2a, 2b via buffer portions 4, 4a provided with arc-shaped leaf springs.
When a running vehicle collides with the fences 3, 3a, 3b arranged on the roadside or the median strip, the fences 3, 3a, 3b are shock-absorbed. 4,4
At the boundary of a, the vehicle falls down from the collision surface in the direction of the opposite surface. At this time, the impact force of the collision is absorbed by the elastic deformation of the arc-shaped leaf spring, thereby causing a collision accident of the vehicle. It can be slightly suppressed.

Then, the above-mentioned arc-shaped leaf spring is connected to the base wall 2,
2a, 2a 'and the fences 3, 3a, 3b are interposed on both sides in the width direction, so that the base walls 2, 2 are usually used.
f, 3a, 3b in a stable state at the top of a, 2a '
Is connected, and in the state where a collision has occurred, the arc-shaped leaf spring on the surface opposite to the collision surface is elastically compressed, whereby the fences 3, 3a, 3b and the foundation walls 2, 2a,
The distribution of the internal stress 2a 'occurs over the entire length in the width direction of the fences 3, 3a, 3b and the foundation walls 2, 2a, 2a', and as in the prior art, the foundation walls 2, 2a, 2a 'and the fence 3 , 3a, 3
b are joined to each other by a metal member at the center in the width direction, the distribution of the internal stress is reduced by the fences 3, 3a,
3b and only half of the thickness of the foundation walls 2, 2a, 2a 'in the width direction, whereby stress is exerted on the fences 3, 3a, 3b and the edges of the foundation walls 2, 2a, 2a' on the widthwise front end side. Concentration, and the concentration of the stress can avoid the disadvantage that the fences 3, 3a, 3b and the foundation walls 2, 2a, 2a 'are easily damaged.

The present invention is not limited to the above embodiment, but also includes the following contents.

(1) In the above embodiment, the protective fence is composed of a reinforced concrete base wall and a fence body (however, the fence body 3a of the second embodiment is made of steel). Although cement, sand and gravel are used, the present invention is not limited to concrete raw materials of cement and sand and gravel, and these are further mixed with fiber materials. You may do so. By doing so, the concrete becomes a so-called fiber rain hosed concrete reinforced with a fibrous material, and debris is less likely to be generated by bonding with the fibrous material. The scattering of the pieces is suppressed, and the effect of preventing the secondary disaster caused by the scattering of the concrete pieces is great.

Further, by using fiber-reinforced hose concrete, it is not necessary to arrange a reinforcing bar in the protective fence 1, and the weight and cost of the protective fence 1 can be reduced accordingly.

Examples of the fiber material include steel fiber, plastic fiber, glass fiber, and carbon fiber. Examples of the plastic fiber include those made of polyethylene, polypropylene, polyvinyl chloride, polyvinyl alcohol, polyester, polyamide, or the like. Fiber materials made of these synthetic resins are very tough and suitable for fiber-reinforced hose concrete.

(2) As the protective fence of the above embodiment, both the foundation wall and the fence body are made of reinforced concrete (however, the fence body 3a of the second embodiment is made of steel). May be made of synthetic resin instead of reinforced concrete, or so-called fiber rain hosed plastic in which the fiber material of the above item (1) is kneaded in synthetic resin. By doing so, the weight of the fence 3 as a precast product can be reduced, transportation and construction can be facilitated, and the synthetic resin and fiber rain hosed plastic themselves have a shock absorbing function. This is convenient for reducing the impact of the collision of the vehicle with the fence 3.

When a synthetic resin is used as the material of the barrier 3, it is preferable to use polyethylene terephthalate (PET) which is rich in rigidity and toughness. Also, PE
In recent years, T has been circulated in the market as PET bottles a lot, and disposal of the waste has become a problem. However, if the fence 3 is manufactured using PET as a raw material, the waste PET bottle can be used as a raw material. It is possible to solve the above-mentioned problem of waste disposal, and it is also effective for effective use of resources.

If an epoxy resin is used as the synthetic resin, the epoxy resin is rich in toughness and is excellent as a material for the fence body 3 subjected to a collision of a vehicle, and is easily hardened by mixing a curing agent. This is effective in facilitating the production of No. 3.

(3) In the above-described embodiment, the fence body is made of ordinary reinforced concrete.
The fence 3a of the embodiment may be made of steel), or so-called prestressed concrete in which concrete is held in a compressed state, instead of ordinary reinforced concrete. By doing so, the concrete is pre-compressed and stress is formed inside, so the bending strength is improved, and when the fences have the same bending strength, the thickness can be made thinner than normal. It is possible, and the weight of the fence body can be reduced accordingly. Further, when the vehicle collides with the fence, it is possible to easily cope with the elongation due to the collision, and the scattering of the concrete pieces is reliably suppressed.

In the prestressed concrete, a steel wire is disposed in advance in the fence body so as to extend in the longitudinal direction, and the steel wire is protruded outside from both longitudinal ends of the fence body. The stretched portions are elastically stretched by pulling them in opposite directions to each other, and in this state, the pressing plates attached to both ends of the steel wire are fixed in advance, and the fence is pressed and sandwiched between the pressing plates. Can be obtained by releasing.

(4) In the above embodiment, the foundation walls 2, 2a and 2a 'are provided on the road fence or on the protective fence laying surface R of the median strip.
Although it is laid while being placed on the top, the present invention is not limited to the case where the foundation wall is placed on the protective fence laying surface R, and when there is room in the construction period, traffic, etc. When it is not necessary to perform the regulation, the protective fence may be formed integrally with the protective fence laying surface R in advance by concrete casting or the like in the field construction.
In particular, when the road is a viaduct, the ground covering part of the wall railing can be used as a foundation wall.

(5) In the above embodiment, the threaded pipe 42 in the fences 3, 3b is provided with the L-shaped anchor rod 42a.
In this case, the embedded state is stabilized by using an anchor plate having a rectangular shape in plan view instead of the L-shaped anchor rod 42a, and this anchor plate is connected to one of the threaded pipes 42 and the other in the fences 3, 3b. May be cross-linked with the threaded pipe 42 of FIG.
By doing so, the threaded pipe 42 is further stabilized in the fences 3 and 3b, and since the pair of threaded pipes 42 are integrated via the anchor plate, the moment when the fences 3 and 3b are tilted due to a vehicle collision. Is the other arc-shaped leaf spring 43
Is transmitted more reliably.

[0105]

According to the road protection fence according to the first aspect of the present invention, the road protection fence includes a base wall disposed on one or both surfaces of the roadside and the median strip, and A buffer formed of a fence stacked on the top of the base wall and absorbing a shock of a vehicle collision with the fence provided between the base wall and the fence in a state where the both are coupled to each other. Is configured to include an arc-shaped leaf spring interposed between both sides in the width direction between the foundation wall and the fence body, so that the fence body is connected to the base wall via a buffer provided with the arc-shaped leaf spring. When a running vehicle collides with the fence of the protective fence provided on the roadside or the central separator, the impact causes the fence to be on the opposite side from the collision surface with the buffer part as a boundary. And the elastic deformation of the arc-shaped leaf spring at this time causes the impact of the collision. There is absorbed, whereby it is possible to suppress the minor collision accident of the vehicle.

Since the arc-shaped leaf springs are provided on both sides in the width direction between the foundation wall and the fence, the fence is normally connected to the top of the foundation wall in a stable state. In the event of a collision, the arc-shaped leaf spring on the side opposite to the collision surface is elastically compressed, thereby distributing the internal stress distribution in the fence and the foundation wall in the width direction of the fence and the foundation wall. When the foundation wall and the fence are joined to each other by a metal member at the central portion in the width direction as in the conventional case, the distribution of the internal stress is reduced in the width direction of the fence and the foundation wall. This avoids the disadvantage that the fence and the foundation wall are liable to be damaged due to the concentration of stress at only the half-thickness portion, thereby causing the concentration of stress at the edge of the fence and the foundation wall at the widthwise front end side. be able to.

Further, since the protective fence is separated into a foundation wall and a fence body, when they are of a conventional integral structure, the impact force of a vehicle collision ripples concentrically in the radial direction around the collision point, and the shear force is increased. Destruction does not cause inconvenience that concrete fragments are scattered around, and only the fence causes bow-like bending deformation with the collision point as the power point, and it is possible to suppress the degree of destruction by bending deformation, Even if it is destroyed, there is little scattering of concrete pieces, which can reliably suppress secondary disasters.

According to the road protection fence according to the second aspect of the present invention, the foundation wall and the fence body are precast products formed in advance so that they can be assembled on site. After carrying it to the site and arranging the foundation wall at a predetermined position along the road, the fence can be stacked on the top of the foundation wall via an arcuate leaf spring to complete the protective fence, The drastic reduction in the ratio can ensure quick workability of the work. Therefore, traffic congestion due to construction can be minimized, which is advantageous in improving road conditions.

According to the road protection fence according to claim 3 of the present invention, the foundation wall is made of concrete and formed to extend downward in the width direction, so that the foundation wall has a considerable weight and
Since the lower portion is spread downward, it can be arranged in a stable state at the roadside or at the median strip.

According to the road protection fence of the fourth aspect of the present invention, a concave groove is formed in the bottom surface of the foundation wall, so that a predetermined mounting surface of the road corresponds to the concave groove on the bottom surface of the foundation wall. By embedding projecting members such as piles and ridges in advance,
By fitting the groove to the projecting member when laying the foundation wall,
The laid state of the foundation wall is stabilized, and lateral displacement in the road surface width direction can be reliably prevented. Further, the protective fence can be made to withstand a large impact force.

According to the road protection fence of the fifth aspect of the present invention, the through-hole penetrating the base wall is provided in the predetermined mounting surface of the road because the through-hole is provided in the base wall in the vertical direction. By embedding in advance a projecting member consisting of a pile or the like corresponding to the above, by attaching the through hole to the projecting member at the time of laying the foundation wall, the laying state of the foundation wall is stabilized,
Lateral displacement in the road surface width direction can be reliably prevented.

According to the road protection fence of the sixth aspect of the present invention, since the foundation wall is formed integrally with the viaduct of the viaduct,
The viaduct is now functioning as a base wall, so that a fence can be provided on the viaduct wall railing.

According to the road protection fence according to the seventh aspect of the present invention, the fence comprises a plurality of poles erected on the foundation wall at a predetermined pitch and a guard rail connecting the plurality of poles. The disadvantage of conventional guide rails is that they are vulnerable to impact force, and are damaged as soon as the vehicle collides.In addition, the poles are buried directly in the soil or through concrete, causing damage. This has the advantage that the inconvenience of time-consuming replacement work is eliminated, and that it can be replaced immediately in the event of damage. That is, the pole can be shortened by the height of the foundation wall, and the collision force can be absorbed by the arc-shaped leaf spring, so that the proof strength of the guardrail can be improved. It is possible to replace only the guardrails as it is, shortening the on-site construction period, helping to alleviate traffic congestion, and reducing the cost of repairs. Further, in addition to these, the landscape of the fence body can be improved in design.

According to the road protection fence of the eighth aspect of the present invention, since the fence is formed in a plate shape corresponding to the foundation wall, the scene of the fence can be made heavy.

According to the road protection fence according to the ninth aspect of the present invention, since the fence is made of synthetic resin, the weight of the fence can be reduced, thereby facilitating on-site installation work. Can be. Further, since the synthetic resin is excellent in impact resistance and also has flexibility, the synthetic resin also has an effect of softening an impact due to a vehicle collision, and an effect of alleviating the impact of the collision can be expected.

According to the protective fence for roads according to the tenth aspect of the present invention, since synthetic resin products obtained by recycling wastes of synthetic resin products are used, effective use of resources is achieved. Can be.

According to the road protection fence according to the eleventh aspect of the present invention, since the fence body is made of fiber rain hosed concrete in which a fiber material is kneaded into concrete, the concrete is dispersed vertically and horizontally inside. Solidified in a state reinforced by each other,
As a result, cracking of the fence body and scattering of concrete pieces can be reliably prevented. Also, no reinforcing bar is required, and the material cost can be reduced accordingly.

According to the road protection fence of claim 12 of the present invention, since a fence made of fiber rain hosed plastic in which a fiber material is kneaded with synthetic resin is used, the synthetic resin is vertically and horizontally inside. The fiber rain hosed plastic becomes solidified while being reinforced with each other by the fiber material dispersed in the fiber, so the fence using this fiber rain hosed plastic has sufficient strength to cope with collisions and is lightweight Can be made into In addition, since the fiber rain hosed plastic does not corrode, the appearance is not impaired, and it is effective in always keeping the protective fence beautiful.

According to the road protection fence of claim 13 of the present invention, one or a combination of two or more of steel fiber, plastic fiber, glass fiber and carbon fiber is used as the fiber material. Many of the fiber materials made of these fibers have high tensile strengths, and therefore, fiber-reinforced hoses and fiber-reinforced hoses into which these are kneaded are made to have a higher strength than those without these materials. be able to.

According to the road protection fence of the present invention, polyethylene is used as the plastic fiber.
Since any of polypropylene, polyvinyl chloride, polyvinyl alcohol, polyester, and polyamide was used, these materials have excellent tensile strength as a fibrous body, and fiber-reinforced concrete and fiber-reinforced hose have high strength. can do.

According to the protective fence for roads according to the fifteenth aspect of the present invention, since polyethylene terephthalate is used as the synthetic resin, the polyethylene terephthalate is a synthetic resin having high rigidity and toughness. It can be an excellent material to receive. Further, it is possible to recycle so-called PET bottles made of polyethylene terephthalate, which contributes to effective use of resources.

According to the road protection fence of the present invention, in the road protection fence of any one of claims 12 to 15, the synthetic resin is an epoxy resin. It is.

According to this protective fence, the epoxy resin is rich in toughness and is excellent as a material for a fence subjected to a collision of a vehicle. In addition, since a curing agent reacts and cures at room temperature by mixing with a curing agent, the production of the fences becomes easy.

According to the protective fence for roads according to the eighteenth aspect of the present invention, a connecting member for connecting each of the fences is provided at a portion facing one of the fences and the other fence. In the state where is constructed, the end of one fence and the end of the other adjacent fence are connected by a connecting member, and each fence is in a state where mutual lateral displacement is prevented, and the end Can be reliably avoided.

According to the protective fence for roads according to the nineteenth aspect of the present invention, since the fence is made of prestressed concrete, the prestressed concrete is pre-compressed and stress is formed inside, and the vehicle collides with the fence. In this case, it is possible to easily cope with the elongation due to the collision, and it is possible to reliably suppress the scattering of the concrete pieces.

According to the protective fence for roads of the present invention, the base wall and the fence are displaced from each other so that their longitudinal seams do not overlap each other vertically. The fences adjacent to each other are connected to the same foundation wall at the bottom, so that when a vehicle collides with the seam of the fence, the impact applied to the end of each fence is caused by the same foundation wall at the bottom. Can be received. Therefore, it is possible to reliably avoid the disadvantage that the entire protective fence is displaced at the end thereof in the event of a vehicle collision,
Secondary traffic disasters caused by displacement can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing a first embodiment of a road protection fence according to the present invention.

FIG. 2 is a sectional view taken along line AA of the protective fence 1 shown in FIG.

FIG. 3 is an exploded perspective view showing a first example of a buffer unit.

FIG. 4 is an assembled perspective view of the buffer shown in FIG. 3;

FIG. 5 is an explanatory view in a side sectional view for explaining an operation of the protective fence of the first embodiment, and shows a state in which an impact force is applied to the fence body due to a collision of a vehicle.

FIG. 6 is a partial perspective view showing a second embodiment of the road protection fence according to the present invention.

FIG. 7 is a partial perspective view showing a third embodiment of the road protection fence according to the present invention.

FIG. 8 is a sectional view showing a modification of the third embodiment of the road protection fence according to the present invention.

FIG. 9 is an explanatory front view showing an embodiment of a method for laying a protective fence.

FIG. 10 is a perspective view showing an embodiment of a joint structure in a portion where the ends of the adjacent fences face each other.

FIG. 11 is a perspective view showing another embodiment of the joint structure at a portion where the ends of the adjacent fences face each other.

[Explanation of symbols]

 1, 1a, 1b, 1b 'Protective fence 2, 2a, 2a' Base wall 21 Base 22, 22a Wall 23 Reinforcing bar 24 Suspension bar 24a Top arc portion 3, 3a Bar body 31 Reinforcing bar 32 Suspension bar 32a Top arc portion 33 Base plate 34 Pole 35 Guard rail 36 Swelling portion 38 Swelling portion reinforcing member 37 Depressed portion 39 Depressed portion reinforcing member 4, 4a Buffer portion 41 Spring receiving base 41a Spring receiving concave portion 41b Long hole 42 Screw pipe 42a Bolt hole 43 Arc-shaped plate spring 43a long hole 44 anchor bolt 44a flange 45 support plate 45a bolt hole 46 anchor rod 47 box 47a opening 48 nut 48a washer 5 connecting member 51 connecting plate 52 partition plate R protective fence laying surface

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-8-184015 (JP, A) JP-A-6-136724 (JP, A) Fully open sho 64-37514 (JP, U) Really open sho 51- 39321 (JP, U) JP-A 49-107829 (JP, U) JP-A 3-5722 (JP, U) Registered utility model 3011626 (JP, U) (58) Fields surveyed (Int. Cl. ⁶ , (DB name) E01F 15/02 E01F 15/08 F16F 7/00

Claims (20)

(57) [Claims] 1. A road protection fence disposed on one or both of a road edge and a median strip of a road in a direction in which the road extends, wherein the protective fence is provided for either one of the road edge and the median strip. It is formed of a foundation wall arranged on both surfaces and a fence body superimposed on the top of the foundation wall, and the vehicle is moved to the fence body in a state where both are connected between the foundation wall and the fence body. A buffer for absorbing the impact of the collision is provided, and the buffer includes an arc-shaped leaf spring interposed between the base wall and the fence on both sides in the width direction, and the arc-shaped leaf spring. Penetrating
Connecting member for connecting the foundation wall and the fence body in a state where
And above the connecting member provided on the foundation wall.
A connecting member for preventing movement and allowing downward movement.
And a box housing the lower end of the road. 2. The road protection fence according to claim 1, wherein the foundation wall and the fence are precast products formed in advance so that they can be assembled on site. 3. The method according to claim 1, wherein the foundation wall is made of concrete and is formed to spread downward in the width direction.
Or the road protection fence described in 2 . 4. The road protection fence according to claim 3 , wherein the foundation wall has a concave groove recessed in a bottom surface. Wherein said basic wall, according to claim 3 or 4 road safety barriers according to, characterized in that it has a through hole penetrating in the vertical direction. 6. The road protection fence according to claim 1, wherein the foundation wall is formed integrally with a viaduct of a viaduct. 7. The fence body comprises a plurality of poles erected on a foundation wall at a predetermined pitch and a guardrail connecting the plurality of poles.
Or the road protection fence described in 2 . 8. The Sakutai is claim 1 or 2 road safety barriers according to, characterized in that it is formed in a plate shape corresponding to the foundation wall. 9. The Sakutai is claim 7 or 8 road safety barriers according characterized in that it is a synthetic resin. 10. The road protection fence according to claim 9 , wherein the synthetic resin is obtained by regenerating waste of a synthetic resin product. 11. The Sakutai is claim 7 or 8 road safety barriers according to, characterized in that the fiber material is a fiber reinforcement hose De made of concrete kneaded concrete. 12. The Sakutai is claim 7 or 8 road safety barriers according to characterized in that the fiber reinforcement hose de plastic kneaded fibrous material to a synthetic resin. 13. The fiber material, steel fibers, plastic fibers, according to claim 11, characterized in that a combination of one of a glass fiber and carbon fiber, two or more, or
12. Protective fence for roads described in 12 . 14. The road fence according to claim 13 , wherein the plastic fiber is any one of polyethylene, polypropylene, polyvinyl chloride, polyvinyl alcohol, polyester, and polyamide. 15. The road protective fence according to claim 10 , wherein said synthetic resin is polyethylene terephthalate. 16. The road protection fence according to claim 9 , wherein the synthetic resin is an epoxy resin. 17. The fence body has a bulging part on one end face in the longitudinal direction, a part of which bulges, and fits into the bulging part on the other end face. The road protection fence according to any one of claims 1 to 16, wherein a dimensioned recess is formed. 18. A the one fence member, the portion facing the other rail member, according to any one of claims 1 to 16 connecting member for connecting each fence member is characterized in that it is interposed Road fence. 19. The fence body is made of prestressed concrete, wherein the fence body is made of prestressed concrete.
The road fence according to 5, 6, 7, 11 , 17 or 18 . 20. The fence body according to claim 1, wherein the base wall and the fence body are arranged so as to be shifted from each other so that respective longitudinal seam portions do not overlap vertically.
20. The protective fence for a road according to any one of 19 .