JP2014077230A - Guard fence and installation method for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a guard fence that absorbs an impact in a collision of a traffic vehicle and that can be reused by being moved even after the collision, and an installation method for the guard fence.SOLUTION: A guard fence 1 absorbs an impact on a collision object V when receiving the collision object V. In the guard fence 1, a plurality of blocks K1-Kn sequentially arranged at intervals L are connected together by a connection bar 2. The block K, which is placed on a ground surface, has at least one coupling member 3 provided at each of both longitudinal ends. A hoop part 31 is provided at the end 30 of the coupling member 3, and the connection bar 2 is inserted through the center 32 of the hoop part.

Description

  The present invention relates to a protective fence that receives a collision object when a traffic vehicle or a falling rock collides, and cushions an impact to the collision object when the collision object is received.

In recent years, roads capable of traveling at high vehicle speeds have been built along with improvements in the performance of transportation vehicles. Specifically, it is the construction of bypasses and highways. Along with the increase in size and speed of vehicles, major accidents leading to serious accidents related to human life such as breaking through the median strip, deviating from the road, and falling are increasing.
The major accident related to human life due to the collision with the protective fence as described above is because most of the force from the traffic vehicle to the protective fence is returned from the protective fence to the traffic vehicle. This is because the lower side of the protective fence is installed in a fixed portion provided in a state of being buried in the ground.

In order to solve such a problem, a block placed on the ground or a road surface is considered. (For example, Patent Document 1 and Patent Document 2)
However, even in the techniques described in Patent Document 1 and Patent Document 2, when a traffic vehicle collides with a protective fence, there is a problem that the connector 3 (Patent Document 1) and the connecting member 3 (Patent Document 2) are discarded. It was. That is, the fact that the connector 3 and the connecting member 3 are destroyed means that an instantaneous force (impact) is returned to the traffic vehicle.
In addition, the installation site of the protective fence was destroyed, making it difficult to reuse.

Shokai 58-50110

Special table 2012-509423

  In view of this, the present invention provides a protective fence that can buffer an impact at the time of a traffic vehicle collision and can be reused by being moved after the collision and a method for installing the same.

In order to achieve the above object, the present invention uses the following means.
(Invention of Claim 1)
The invention according to claim 1 is a protective fence for buffering an impact on the collision object when receiving the collision object, and the protection fence is formed by connecting a plurality of blocks arranged sequentially at intervals. The block is placed on the ground, has at least one connecting member at each end in the longitudinal direction, has a hoop portion at each end of each connecting member, and has a connecting rod. The hoop is inserted into the center of the hoop.
(Invention of Claim 2)
The invention according to claim 2 relates to the protective fence according to claim 1, wherein the connecting members are provided at both ends of the block so as to penetrate the longitudinal direction of the block, and the hoop portions are connected members. Is characterized by a ring shape.

(Invention of Claim 3)
A third aspect of the present invention relates to the protective fence according to the second aspect, wherein the ground side is a plurality of blocks and the upper side is a guard rail.
(Invention of Claim 4)
The invention according to a fourth aspect relates to the protective fence according to the third aspect, wherein the plurality of guard rails are attached to pillars provided in the plurality of blocks, and a pillar deformation space is provided around the pillars. Is provided.

(Invention of Claim 5)
A fifth aspect of the present invention relates to the protective fence according to any one of the first to fourth aspects, wherein the connecting rod has a head portion and a trunk portion, and the outer diameter of the head portion is a hoop portion. The outer diameter of the body portion is smaller than the inner diameter of the hoop portion.
(Invention of Claim 6)
A sixth aspect of the present invention relates to the protective fence according to any one of the second to fifth aspects, wherein a cushioning material is provided on the side where the collision object is present.

(Invention of Claim 7)
Invention of Claim 7 is related with the installation method of the guard fence in any one of Claim 3 thru | or 6 which has at least a 1st block and a 2nd block, Comprising: The connecting rod was penetrated by the hoop part. At this time, the connecting rod is hung by the head, and the connecting rod body can swing to the second block side hoop portion of the first block and also swing to the first block side hoop portion of the second block. The first block and the second block are placed on the ground.
(Invention of Claim 8)
Invention of Claim 8 is related with the installation method of the guard fence of Claim 7, Comprising: A 1st block, a 2nd block ... n-th block is on the ground so that a space | interval of 5-50 mm can be made. The gap between the outer diameter of the body portion of the connecting rod and the hoop portions on both sides is 3 to 20 mm.

(Effect of Claim 1)
Each of the blocks placed on the ground can be moved by an impact, and since the blocks are connected via a connecting member that is not a rigid body, the impact between the blocks can be absorbed. In other words, collision energy can be absorbed by movement of the entire connected blocks. Wires and stretchable materials can be used as connecting members that are not rigid bodies.
Moreover, since it only puts a block, when using for the construction of a highway, etc., it becomes a protection fence which can be moved after use.
(Effect of claim 2)
Since the end of the block is not connected by forming a groove or the like, the end is not easily damaged. Even if a large impact is generated on the connecting member, the force can be received in the entire block longitudinal direction, and it is difficult to break.

(Effect of claim 3)
Rather than using a block for the entire protective fence, the upper half of the guard fence is used as a guard rail, so that the destruction of the collision object can be reduced.
(Effect of claim 4)
When a collision object collides with the guard rail, a space in which the support column can be deformed even in the block can be provided to reduce the destruction of the collision object. Moreover, if the support | pillar deformation | transformation space is provided, destruction of an impact object can be reduced and the movement distance of the block K can be made small because a support | pillar bends.

(Effect of Claim 5)
Simply by placing the blocks on the ground and inserting a connecting rod into the ring, the blocks can be linked together. Moreover, it becomes the aspect which hangs by the head, and there is no fear that a connecting rod will come off from the lower side.
(Effect of claim 6)
A cushioning material can be attached to one side or both sides of the block to reduce the destruction of the collision object. The mounting position of the cushioning material is preferably matched to the height of the collision object.

(Effect of Claim 7)
It is preferable to connect the blocks with some play. If it connects in this way, the absorption of the impact by a connection member will become more effective.
(Effect of Claim 8)
The aforementioned slight play is optimally within the scope of claim 7.

FIG. 1 is a top view of a protective fence according to the first and second embodiments. FIG. 2 is a front view of the block according to the first embodiment. FIG. 3 is a perspective view of a block according to the first embodiment. FIG. 4 is a connection surface of blocks according to the first embodiment. FIG. 5 is a B cross-sectional view of the block of the first embodiment. FIG. 6 is a C cross-sectional view of the block according to the first embodiment. FIG. 7 is a perspective view of a block and a guard rail according to the second embodiment. FIG. 8 is a D cross-sectional view of the block and the guard rail according to the second embodiment.

  A protective fence that can be used for buffering an impact at the time of collision of a transportation vehicle and that can be moved and reused after the collision and its installation method will be described together with respective drawings showing embodiments.

[1. About the overall configuration of the protective fence 1]
FIG. 1 is a top view of the protective fence 1 according to the first and second embodiments.
The guard fence 1 is composed of an arbitrary number n of blocks K. The plurality of n blocks K can be sequentially arranged in a straight line or curved shape in a manner along the road.
When arranging the blocks K in a straight line, as shown in FIG. 1, the first block K1, the second block K2, the third block K3,..., The (n−1) th block Kn−1, the nth block Kn are straightened. Deploy. The plurality of blocks K1 to Kn are connected by a connecting rod 2 as shown in the enlarged view of the A part in FIG.
And the protective fence 1 receives the collision of the collision object V (for example, car).

[2. About Block K]
FIG. 2 is a front view of the block K according to the first embodiment. FIG. 3 is a perspective view of the block K of the first embodiment. FIG. 4 is a connection surface of the block K according to the first embodiment. FIG. 5 is a B cross-sectional view of the block K of the first embodiment. 3 is a C cross-sectional view of a block K according to Embodiment 1. FIG.
The block K is made of concrete and placed on the ground, and as shown in FIGS. 2 to 4, the ground side is widened and the upper side is narrowed so that it can be stably installed. In Example 1, the block K was in the shape of a jersey barrier. The jersey barrier is also called a Florida guardrail, and includes a grounding surface 10, a tilt angle change line 11 that changes the tilt angle of the tilted surface, an upper surface 12, and a connection surface 13. 2 to 4, the block K preferably has a depth of 1900 to 3500 mm, a height of 600 to 1000 mm, a ground plane width of 500 to 700 mm, and an upper surface width of 140 to 200 mm.
Further, the block K may have a trapezoidal shape, or a cushioning material may be provided on the inclined surface on the side where the collision object V in FIG. 1 exists. Examples of the buffer material include materials having a high buffer effect such as rubber, EPS, and plastic. If the edge of the connection surface 13 such as the bottom side or the side surface of the block K is chamfered to have a semicircular shape of 10 to 50 mm, the block K will come into contact with another block K when it is moved by the impact of the collision object V. Since it can prevent that the four corners by the side of a bottom face are missing, it becomes a desirable mode.

[3. About connecting member 3]
As shown in FIGS. 2 to 4, the block K has at least one connecting member 3 at each of both ends in the longitudinal direction, and a hoop portion 31 is provided at the end 30 of each connecting member 3. The hoop portion 31 is obtained by forming the connecting member 3 into a ring shape. The hoop portion 31 may be a metal ring and connected to the connecting member 3.
The connecting members 3 are preferably provided at both ends of the block K so as to penetrate the longitudinal direction of the block K. Specific examples of the connecting member 3 include a metal wire, a metal chain, and flat iron. It is preferred to use steel wire.
When the depth of the block K is 1985 mm, the connecting member 3 has a length of 2605 mm and folds back the length of 560 mm from the end 30. And it is set as the connection member 3 of 2045 mm in total length which has the hoop part 31 of bending length 60mm (diameter 38.2mm). The remaining 500 mm of the end 30 is preferably embedded in the block K. When the connecting member 3 is not penetrated into the block K, the connecting members 3 at both ends may be embedded in the block K by about 500 to 900 mm.
The thickness of the connecting member 3 is preferably 9 to 12 mm in diameter. In Example 1, the thickness was 10 mm.

[4. About connecting rod 2]
As shown in FIGS. 3 to 6, the connecting rod 2 is inserted through the hoop portion center 32 of the hoop portion 31.
As shown in FIG. 3, the connecting rod 2 has a head portion 20 and a trunk portion 21, and the outer diameter of the head portion 20 is larger than the inner diameter (diameter 28.2 mm) of the hoop portion 31. The outer diameter of the trunk portion 21 is smaller than the inner diameter (diameter 28.2 mm) of the hoop portion 31. If it does in this way, the connecting rod 2 can be made to respond | correspond with the upper hoop part 31 and the head 20 hanging.
Moreover, as shown to FIGS. 3-6, the stopper 14 can be provided in the both ends of the upper surface 12, and it can be set as the aspect which hangs the connecting rod 2. FIG.

[5. About installation method of protective fence 1]
As shown in FIGS. 1 and 5, the blocks K are arranged with an interval L therebetween.
As described above, when the connecting rod 2 is inserted into the hoop portion 31, the connecting rod body portion 21 swings to the second block K2 side hoop portion 31 of the first block K1. It is preferable to place the first block K1 and the second block K2 on the ground so that the first block K1 side hoop portion 31 of the second block K2 can swing.
The first block K1, the second block K2,..., The nth block Kn are placed on the ground so as to have an interval L of 5 to 50 mm, and the outer diameter of the body portion 21 of the connecting rod 2 and the hoop portions 31 on both sides. Each gap is 3 to 20 mm. More preferably, the distance L is 5 to 30 mm, and the gap is 3 to 10 mm.

[6. About interval L]
As shown in FIG. 4, the blocks K are placed on the ground and are arranged with an interval L therebetween. When the colliding object V collides with the block K, the interval L gives a space for moving to the block K which is a heavy object. Since the grounding of the conventional block K is fixed to the ground with bolts and is not provided with the interval L, the kinetic energy of the collision object V becomes energy that destroys the collision object V. However, since the guard fence 1 has the interval L, the kinetic energy of the collision object V can be used as the movement energy of the block K, and the destruction energy to the collision object V can be reduced.
Further, there is a situation in which the block K moves due to the collision, the interval L is narrowed, the adjacent blocks K come into contact with each other, and each connection surface 13 is destroyed. In order to avoid such a situation, the connection surface 13 may include a cushioning material.

[7. About the action and effect of the protective fence 1]
As described above, since the protective fence 1 is composed of the blocks K1... Kn, if the block K alone (for example, the block K2 in FIG. 1) cannot receive the kinetic energy of the collision object V, it is connected to the connecting rod 2. The adjacent blocks K (for example, the blocks K1 and K3 in FIG. 1) are moved by the connection of the member 3, thereby buffering the destruction of the collision object V. Therefore, the possibility that the colliding object V will be totally damaged and severely damaged is lower than when colliding with a conventional concrete wall or guardrail extending from the ground.

[8. Experimental results of protective fence 1]
On September 22, 2012, a collision test of the protective fence 1 described in Example 1 was performed. The collision object V was a passenger car having a vehicle weight of 1580 kg. The block K had a depth of 2485 mm and a weight of 1300 kg.
As shown in FIG. 1, as a result of the passenger car V having a speed of 72 km / h colliding with the protective fence 1 at an angle of 20 ° (incident angle 70 °), the four blocks K moved. The moving distance of the most moved block was 68 cm.
The crashed passenger car is not severely damaged, and the vehicle's departure prevention performance, which is described in the “Protection Fence Installation Standards and Explanations” (2008 Road Revised Edition, pages 16 to 18) Satisfies safety performance, vehicle guidance performance, and function of preventing the scattering of components, and was able to safely guide passenger cars.

Next, Example 2 will be described. FIG. 1 is a top view of a protective fence according to the first and second embodiments. FIG. 7 is a perspective view of the block K and the guard rail G according to the second embodiment. FIG. 8 is a D cross-sectional view of the block K and the guardrail G according to the second embodiment.
In Example 2, [1. Overall configuration of protective fence 1] [3. Regarding the connecting member 3] [4. Regarding the connecting rod 2] [5. About the installation method of the protective fence 1] [6. About the interval L] [7. The contents of “Operation / Effect of Guard Fence 1” are the same as those in the first embodiment. Therefore, [2. Regarding the column “about block K”, points different from the first embodiment will be described.

[9. Overview of Block K and Guardrail G]
As shown in FIGS. 1, 7, and 8, the protective fence 1 can be configured in which the ground side is a plurality of blocks K <b> 1 to Kn and the upper side is a guard rail G <b> 1 to Gn.
As shown in FIG. 8, the guard rail G is fixed to the column 4 extending from the block K by using a guard rail fixture 40.

[10. About Block K]
The block K is made of concrete and is placed on the ground, and as shown in FIGS. 7 and 8, the ground side is wide and the upper side is narrowed so that it can be stably installed. Block K was in the shape of a jersey barrier. The jersey barrier is also called a Florida guardrail, and includes a grounding surface 10, a tilt angle change line 11 that changes the tilt angle of the tilted surface, an upper surface 12, and a connection surface 13. 7 and 8, the block K preferably has a depth of 1800 to 3200 mm, a height of 250 to 500 mm, a ground contact surface width of 500 to 700 mm, and an upper surface width of 270 to 420 mm.
Further, the block K may have a trapezoidal shape, or a cushioning material may be provided on the inclined surface on the side where the collision object V in FIG. 1 exists. Examples of the buffer material include materials having a high buffer effect such as rubber, EPS, and plastic. If the edge of the connection surface 13 such as the bottom side or the side surface of the block K is chamfered to have a semicircular shape of 10 to 50 mm, the block K will come into contact with another block K when it is moved by the impact of the collision object V. Since it can prevent that the four corners by the side of a bottom face are missing, it becomes a desirable mode.

[11. About guardrail G]
As shown in FIGS. 7 and 8, the guard rail G is fixed using a guard rail fixture 40. As the material of the guardrail G, a hot dip galvanized steel plate and a steel strip were used. The guard rail G has a corrugated cross section, and preferably has a depth of 1700 to 2100 mm, a height of 150 to 250 mm, and a wave width of 40 to 80 mm. The center of the guardrail G is fixed by the guardrail fixture 40 at a height of 500 to 700 mm from the ground.

[12. About support 4]
As shown in FIG. 8, the support column 4 is inserted into the block K. The lower part of the inserted support column 4 is welded to a support fixture 50 having a hollow portion 5 provided in the block K. The support fixture 50 is an H-shaped steel column or the like, and is fixed to the block K with a bolt 51.
The diameter of the column 4 is preferably 114.3 to 139.8 mm, and the total length is preferably 500 to 950 mm.
Then, by setting the outer diameter of the support column 4 to 95 to 75% of the inner diameter of the circular hole provided in the block K, the support column deformation space 41 is formed.

[13. About the column deformation space 41]
A column deforming space is formed between the inner surface of the circular hole of the block K and the outer surface of the column 4 by inserting the column 4 having an outer shape smaller than the inner diameter of the circular hole provided in the block K into the block K. 41 is produced. In the support column deformation space 41, the distance between the inner surface of the circular hole of the block K and the outer surface of the support column 4 is preferably 50 to 100 mm. According to the support column deformation space 41, the collision energy when the collision unit V collides with the guard rail G is consumed for deformation such as bending of the support column 4, so that the inner surface of the circular hole of the block K and the outer surface of the support column 4 The moving distance of the block K can be reduced as compared with the case where are closely attached.
When the collision object V collides with the guard rail G, the collision energy causes the support 4 to be elastically deformed and / or plastically deformed through the guard rail G. And the rod-like object such as the support column 4 can be deformed with a smaller force as the overall length is longer.

[14. About the action and effect of the protective fence 1 of Example 2]
When the guard rail G is used above the guard fence 1 as in the second embodiment, even if the colliding object V comes into contact, the collision rail V can be consumed by the deformation of the guard rail G, and the colliding object V is completely damaged or severely damaged. Probability can be lowered. Moreover, when it is moved and reused even after a collision, it is light in weight and easy to carry.

  The protective fence 1 can be provided at a portion where it is attached to an existing road when a bypass road, a high-standard road, or the like is provisionally shared. It can also be provided as a protective fence for protecting workers during construction along the road. In addition, it can also be used as a protective fence that catches falling rocks.

V colliding object L interval K block
(K1 first block, K2 second block, ..., Kn nth block)
G guardrail
(G1 first guardrail, G2 second guardrail, ..., Gn nth guardrail)
DESCRIPTION OF SYMBOLS 1 Guard fence 10 Ground surface 11 Inclination angle change line 12 Upper surface 13 Connection surface 14 Stopper 2 Connection rod 20 Head 21 Body 3 Connecting member 30 End part 31 Hoop part 32 Hoop part center 4 Support | pillar 40 Guardrail fixture 41 Support | pillar deformation space 5 Hollow part 50 Prop fixture 51 Bolt

Claims (8)

A protective fence (1) for buffering an impact on the collision object (V) when receiving the collision object (V),
Guard fence (1)
A plurality of blocks (K1 to Kn) arranged in order at intervals (L),
Connected with the connecting rod (2)
Block (K) is placed on the ground,
Having at least one connecting member (3) at each longitudinal end;
A hoop part (31) is provided at the end part (30) of each connecting member (3),
A protective fence characterized in that the connecting rod (2) is inserted through the center (32) of the hoop. The connecting member (3)
It is provided at each end of the block (K) in correspondence with the longitudinal direction of the block (K),
The protective fence according to claim 1, wherein the hoop portion (31) has a ring-shaped connection member (3). The ground side is a plurality of blocks (K1 to Kn),
The upper side was a guardrail (G1 to Gn),
The protective fence according to claim 2. The plurality of guard rails (G1 to Gn) are
It is attached to the support (4) provided in the plurality of blocks (K1 to Kn),
Around the column (4)
The protective fence according to claim 3, wherein a supporting column deformation space is provided. The connecting rod (2) has a head (20) and a body (21),
The outer diameter of the head (20) is larger than the inner diameter of the hoop (31),
The protective fence according to any one of claims 1 to 4, wherein an outer diameter of the trunk portion (21) is smaller than an inner diameter of the hoop portion (31). The protective fence according to any one of claims 2 to 5, wherein a buffer material is provided on a side where the collision object (V) exists. The installation method of the protective fence (1) according to any one of claims 3 to 6, comprising at least a first block (K1) and a second block (K2),
When the connecting rod (2) is inserted through the hoop (31),
The connecting rod (2) is suspended by the head (20),
Connecting rod barrel (21)
It can swing on the second block (K2) side hoop portion (31) of the first block (K1) and can also swing on the first block (K1) side hoop portion (31) of the second block (K2). In addition,
A method for installing a protective fence, wherein the first block (K1) and the second block (K2) are placed on the ground. The first block (K1), the second block (K2)... The nth block (Kn)
Placed on the ground to have a spacing (L) of 5-50 mm,
The gap between the outer diameter of the body (21) of the connecting rod (2) and the hoops (31) on both sides is
3-20mm,
The installation method of the protection fence of Claim 7 characterized by the above-mentioned.