JP2004027825A - Wooden guard fence - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-strength, flexible wooden guard fence capable of maintaining the acceleration of a small vehicle at or below 9g while keeping wooden beams from dropping upon collision. <P>SOLUTION: A joint plate with a tensile strength of 2t or more, having a length greater than a specified value that is 9 to 27% of the length of a wooden beam stretched across posts, is positioned along the abutting position of the wooden beam. The joint plate and the wooden beam are connected together via a mounting hole bored in the wooden beam at a position corresponding to the specified value of the joint plate. The joint plate and the wooden beam are secured to the posts. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to wooden fences installed on bridges, roads, sidewalks, parking lots, parks, and the like, and in particular, by adopting an appropriate joint structure between struts and wooden beams, a high-performance function capable of coping with vehicle collisions. It is a wooden protective fence.
[0002]
[Prior art]
The guard fence is commonly called a guardrail, and a steel guard fence using a steel plate rail having a corrugated cross section, a reinforcing pipe, a wire cable, and the like, and a wooden guard fence using wood as a cushioning material are known (Japanese Patent No. 29974949). No. 2958254). Among them, the steel fence is also called a deformable fence, and is expected to have a function of suppressing runaway of a vehicle or the like by absorbing collision load energy by deformation of the steel rail. However, since this steel protective fence is designed to absorb the collision load energy only by deformation of the steel rail, the amount of deformation due to the collision load is large, and in mountainous areas, etc., the guard rail is knocked down and the vehicle falls under the road. There were many cases of falling, etc., and the fall prevention function measures were inadequate.
[0003]
In order to solve these problems, the present inventor has made effective use of wood, which is excellent in landscape and is a material with reduced environmental load, as described in Japanese Patent Nos. 2,974,949 and 2,958,254. Utilized wooden protective fences and provided protective fences with excellent fall prevention function.
[0004]
In these wooden protective fences, the connection between the column and the wooden beam is performed by one continuous bolt penetrating the column. However, depending on the installation ground and topographical conditions of the protective fence, the amount of deformation of the protective fence may be excessive due to the impact load, and especially when the deformation of the approach fence exceeds 350 mm, the timber connection part may fall off. Was. In addition, since small vehicles tend to receive relatively high acceleration at the time of collision, there is a need for improvement. The requirements for establishing a wooden fence are so important that success or failure is determined by the magnitude of the deformation.
[0005]
[Problems to be solved by the invention]
In view of the above prior art, the present invention provides a wooden protective fence with specific shock absorbing properties, environmental protection, and natural scenery, and appropriately sets the requirements for establishing a wooden protective fence, particularly the magnitude of deformation due to vehicle collision. It is an object of the present invention to provide a high-performance, high-strength wooden protective fence that does not cause the connecting portion to fall off and that can reduce the acceleration received when a small vehicle collides.
[0006]
[Means for Solving the Problems]
The wooden protective fence of the present invention that solves the above-mentioned problem is characterized in that a wooden beam having a length determined according to a unit span of the column is continuously provided inside the ground portion of a plurality of columns erected along the road side of the road. A wooden fence fenced by joining
A 9-27% length of the length of the wooden beam is defined as a specified value A1 around the joint position of the wooden beam material, and a joint plate having a larger length A2 and an expansion force of 2 tons or more is used. Placed horizontally,
The joint plate and the wooden beam are connected to each other via a mounting hole formed in the wooden beam corresponding to the specified value A1 of the joint plate, and these are fixed to the column.
[0007]
At the specified value position of the joint plate, a mounting hole for inserting a connecting bolt is formed or a connecting bolt is fixed by using this as an opening gap.
[0008]
The specified value is set to 9 to 27% of the length of the wooden beam in order to prevent breakage due to wood tearing when a tensile force of 2 tons or more is applied in the presence of the connecting bolt inserted into the mounting hole. It is. When the length of the wooden beam is 2 m, this value is specifically 180 to 540 mm. Protrusions may be appropriately provided on the joint plate contact surface with the wooden beam to increase mutual frictional force. In addition, this projection can be used as a part of a space structure described later to enhance the cushioning function. The joint plate is provided on the back or front of the wooden beam. The cross-sectional shape of the joint plate can be freely determined, such as an arcuate shape, a flat shape, or a shape in which a cover member or a bracket material is integrated with these shapes. In order to hold the wooden beams together without stretching due to the impact load, a strength of an expanding force of 2 tons or more is required.
[0009]
The wooden beams joined and joined from the left and right directions inside the column are rigidly connected to each other via a joint plate having an expansion force (tensile strength) of 2 tons or more, so the collision load is received by the wooden beam in the pulling direction. be able to. Therefore, there is no possibility that the connection part will fall off due to a collision within the standard. In order to reduce the deformation amount of the wooden beam, it is possible to increase the beam diameter. However, in the present invention, the amount of deformation is limited by the joint plate without increasing the beam diameter, and on the contrary, a certain amount of approaching stroke of 100 to 200 mm is allowed. Therefore, the acceleration received by the small vehicle can be reduced to 9 g or less, and a flexible and high-strength wooden protective fence can be obtained. There is no need to use a rigid wooden beam such as a large log in the dark.
[0010]
A space structure for enhancing a buffer function at the time of a vehicle collision can be interposed between the column and the joint plate. The space structure can be constituted by a deformable bracket, a rubber-like cushion material, or the like. If the space structure is interposed, the wooden beam at the time of the collision, while moving in this space, the resilient force corresponding to the deformation amount is given to the vehicle, the impact amount is made smaller, and the acceleration given to the vehicle is made smaller. can do.
[0011]
The joint plates can also be interconnected by high tensile strength reinforcement bands. The impact load can reduce the amount of displacement converted into tension by the interconnected wooden beam and the solidarity of the reinforcing band. It is also possible to reduce the strength of the wooden beam by an amount corresponding to the reinforcing power of the reinforcing band. Therefore, the beam diameter can be reduced accordingly, and the flexibility can be further increased. When the flexibility of the wooden beam is increased, the cushioning function is enhanced, and the acceleration at the time of collision of a small vehicle can be further reduced.
[0012]
When the wooden beam is composed of a plurality of rod-shaped members, the appropriate values for the respective dimensions of the wooden protective fence of the present invention are as follows.
[0013]
(1) The height from the road surface to the lower surface of the lowermost wooden beam is H1 = 50 to 350 mm;
(2) The interval between the wooden beams is H2 = 50 to 250 mm;
(3) The height from the road surface to the uppermost wooden beam upper surface is H3 = 650 to 1000 mm;
(4) The overhang dimension of the wooden beam from the support to the road side is BK ≧ 60 mm,
(5) The difference of the overhang dimension of each step wooden beam from the column to the road side is ΔK ≦ 60 mm.
[0014]
By setting the height H1 = 50 to 350 mm, it is possible to prevent the vehicle from digging in and to flexibly cope with a collision of a fender portion of the vehicle. By setting the interval H2 = 50 to 250 mm, a vehicle collision can be cooperatively received by a plurality of wooden beams. The height H3 ≦ 1000 mm is a necessary and sufficient dimension for a large vehicle. If the height is higher than this, the moment assumed in the case of a large vehicle becomes large, and the strength cannot be compensated. The overhang dimension (block-out) BK of the wooden beam from the column to the road side is required to be at least 60 mm, preferably 90 mm or more, and more preferably 140 mm or more. By designing a sufficient block-out BK, a sufficient buffer function can be exhibited. By setting the difference ΔK between the block-outs BK of each wooden beam to be within 60 mm, it is possible to always cope with a collision with a plurality of wooden beams and to provide a design that does not seem unnatural. ΔK ≦ 30 is a more preferable value, but is a value that is difficult to use with a wooden beam using thinned wood because of a diameter error.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
1 and 2 showing an embodiment of the present invention, a wooden protective fence 2 is installed on the road side of a road 1. The wooden protective fence 2 has a pair of upper and lower wooden beams 4 and 5 suspended inside a support 3.
[0016]
The column 3 has a steel pipe pier 7 buried in the underground 6 of the road 1 and a concrete molded body 9 with a leg 8 suspended from the bottom, in a mortar filled in the hollow portion of the steel pipe pier 7. The two can be integrated after the mortar is solidified.
[0017]
A pedestal block 10 made of concrete is provided around the ground surface of the steel pipe buckle 7. The surface area of the pedestal block 10 is at least twice as large as the bottom area of the concrete molding 9. The position where the leg 8 is suspended from the concrete molding 9 is a position closer to the inside of the road. Further, a projection (not shown) for preventing the filled mortar from moving is provided in the inside of the steel pipe tube 7. When a collision load F is applied to the front surface of the column, the force F is converted into a rotational moment M with the pedestal block as a fulcrum, and further converted into a pulling force T of the leg 8. Therefore, the leg 8 can withstand a large pulling force T. Come In addition, it is possible to provide a strong column structure that does not easily bend under a large collision load F.
[0018]
The length of the steel pipe butt 7 is Lm, and the outer diameter is Dmm. The outer diameter D is 135 mm or more, and the buried length is 1.3 m or more in flat terrain, and 1.8 m or more in the vicinity of the road shoulder. By adopting such dimensions, it is possible to obtain a column structure that does not easily bend and is not pulled out with respect to a collision load within the standard, and that can have a column inclination angle of 15 degrees or less.
[0019]
Regarding the mounting positions and dimensions of the wooden beams 4 and 5, the height H1 from the road surface to the lower surface of the lowermost wooden beam 5 is set to 50 to 350 mm. The interval H2 between the wooden beams is set to 50 to 250 mm. The height H3 from the road surface to the upper surface of the uppermost wooden beam 4 is 1000 mm or less. In addition, the block-out BK of each wooden beam 4, 5 with respect to the forefront of the column is set to 60 to 140 mm or more, and the difference ΔK between the overhang dimensions of each wooden beam is set to 60 mm or less. By adopting such a dimension, there is no possibility of the vehicle getting in and over, and the cooperative action of the upper and lower wooden beams can be obtained. . This is the result of performing many experiments.
[0020]
The length SP of the wooden beams 4, 5 is determined in accordance with the unit span of the column 3, and is continuously joined with the end faces abutting each other. Along the joint position of the wooden beams 4, 5, a joint plate 11 having a length A2 larger than a specified value A1 of 9 to 27% of the beam length SP and having an expansion force of 2 tons or more is arranged. You. A mounting hole 12 is drilled corresponding to the specified value A1 of the joint plate 11, and the joint plate 11 and the wooden beams 4, 5 are connected to each other via the mounting hole 13 drilled in the wooden beams 4, 5. These are fixed to the support column 3. In this example, the fixing is performed by the U-shaped connecting bolt 14. The cross-sectional shape of the joint plate 11 is shown as an example of an arcuate shape in accordance with a log, but this is in accordance with the outer shape of the beam, and may be a flat shape.
[0021]
The U-shaped connection bolt 14 can be configured by combining two L-shaped bolts. That is, a pair of L-shaped bolts having both ends threaded and a long nut are prepared, and one of the screw portions is screwed down to a half position of the nut, and the post 3 is inserted into a hole penetrating in the lateral direction. I do. Then, one side of another L-shaped bolt is inserted from the other side of the hole and turned, and screwed into the other end of the nut to form the U-shaped bolt 14 shown in FIG. There is an advantage that the bolt interval can be freely adjusted. As shown in FIG. 4, the bolts are placed in a horizontal position, and the mounting holes 12 of the joint plate 11 and then the mounting holes 13 of the wooden beam are inserted into the bolts.
[0022]
The joint plate 11 may also be located on the front side of the wooden beams 4 and 5 so that the wooden beams 4 and 5 are sandwiched between the pair of joint plates 11. In addition, a projection may be provided on the joint surface of the joint plate 11 with the wooden beam to increase the mutual frictional force and increase the fixing force in the tension direction. It is also possible to increase the size of the projection and form a space therein to enhance the cushioning function. In FIG. 2, it is important that the nut 15 to be hung on the front end of the connecting bolt 14 is housed in the wooden beams 4, 5, so that the head does not protrude to the surface. This is to prevent harm to vehicles and pedestrians. In this case, the nut 15 is embedded in the wooden beams 4,5.
[0023]
When the vehicle collides in this state, the wooden beams 4 and 5 move in the direction of the column 3 due to the collision load F, and a gap can be generated in the contact portion between the nut and the nut 15 of the wooden beams 4 and 5. In order to enable this space movement, the inner diameter of each mounting hole is set to a diameter larger by 1 to 6 mm than the diameter of the used bolt.
[0024]
2 and 3 show a high tensile strength reinforcing band 16 for interconnecting the joint plates 11 with each other. The illustration in FIG. 1 is omitted. The use of the reinforcing band 16 realizes a higher-strength tension between the columns 3, 3 and the mutual tension and solidarity of the wooden beams 4, 4. Thus, a flexible and high-strength wooden protective fence 2 is formed. The diameter of the wooden beams 4, 5 can be reduced accordingly. Alternatively, the strength of the plate-shaped wooden beam can be reduced.
[0025]
As shown in FIG. 5, a deformable space can be obtained by interposing a rubber-like cushioning material 17 between the column 3 and the joint plate 11. The deformation space formed by the cushioning material 17 has a cushioning function, and can significantly improve the shock absorbing function. That is, when the vehicle collides, the degree of impact is determined by the elastic force of the colliding portion, but the cushion member 17 helps to reduce the elastic force. In addition, during the minute time when the wooden beam moves spatially while the elastic force is acting, it takes a long time to respond to the impact, which helps to reduce the acceleration. The cushion member 17 can be made of a vibration-proof rubber, a foam rubber, or the like. When the cushion material is made of neoprene, natural rubber, or other synthetic rubber, it may be baked and adhered to an iron plate fixed to the column 3, and a connection bolt instead of the U-shaped connection bolt 14 may be fixed to this iron plate. it can. For this reason, the mounting hole 12 provided in the joint plate 11 is not a necessary condition of the present invention. It is a requirement that the drilling position of the mounting hole 12 be determined by the specified value A1. By properly designing the anti-vibration rubber, it is possible to provide a required elastic force and an appropriate cushioning function, which can greatly contribute to the enhancement of the function of the wooden protective fence.
[0026]
FIG. 6 is an example showing the influence of the presence or absence of the joint plate 11 on the approaching stroke together with a comparative example. This example was actually obtained by a collision experiment.
[0027]
The horizontal axis indicates the column number, and the vertical axis indicates the approach stroke deformation amount. The characteristic diagram 18 shown by the broken line shows the displacement amount when the joint plate 11 is not provided, and the characteristic diagram 19 shown by the solid line shows the displacement amount when the joint plate 11 is attached. The reinforcing bands 15 are not attached together.
[0028]
As shown in FIG. 6, the wooden guard fence which has been displaced to near the allowable value of 350 mm is reduced to half of 167 mm by adding the joint plate 11. It should be noted that the other conditions were not changed at all, and that the wooden beams 4, 5 had the same contents. That is, the joint plate 11 receives a part of the collision load converted into a tensile force by strengthening the coupling force between the wooden beams to be coupled, and does not increase the acceleration of the vehicle. This is the reason why the structure is flexible and strong. As described above, in the present invention, the amount of deformation of the protective fence is set to about 100 to 250 mm under a collision load of about 60 KJ, and the acceleration received when a passenger car collides at a collision speed of about 60 KM / H is suppressed to 9 g or less. This makes it possible to provide a wooden protective fence with excellent safety.
[0029]
The flexible and strong wooden fence can be further strengthened by additionally installing the reinforcing band 15. In order to obtain the same displacement, the strength of the wood beam, that is, the outer diameter, can be reduced by the amount of the reinforcement of the reinforcing band, so that the design can be enhanced and the cost can be reduced in addition to the performance improvement.
[0030]
FIG. 7 is a perspective view showing an embodiment of a flat joint plate in the case where the column is made of steel pipe. A bracket 23 is fixed to the steel pipe support 20 by bolts 21 and nuts 22. A pair of holes 25R and 25L are formed near both ends of the bracket 23 in correspondence with the mounting holes 12 of the flat joint plate 24. On the other hand, a mounting hole 13 is also drilled at one end of the wooden beam 26. Accordingly, bolts (not shown) are inserted into the mounting holes 13 of the wooden beams 4 and 5, the mounting holes 12 in the joint plate 24, and the holes 25 </ b> R or 25 </ b> L of the bracket 23 through the bracket 23 fixed to the steel pipe support 20. The wooden beam 26 can be fixed to the support column 20 via.
[0031]
According to the wooden protection fence 27 shown in FIG. 7, the wooden beams 26 are connected to each other via the flat joint plate 24, so that the mutual holding between the beams is strengthened, and an appropriate approach stroke is obtained, and a high strength, Become highly functional.
[0032]
The wooden protective fence 28 shown in FIGS. 8 and 9 differs from that of FIG. 7 in the shape of the bracket and the joint plate. That is, a straight portion is provided at the turning point of the bracket 29 in the vicinity of the steel pipe column 20 to enhance the cushioning of the space 30. Further, the joint plate 31 has an arc-shaped cross section, and the width of the fixed portion of the wooden beams 26A and 26B is expanded to make the planar development shape an H shape. The wooden beams 26A and 26B are fixed by inserting the threaded portions of the bolts 32 from the front side, and hooking the nuts 22 on the rear side through the mounting holes of the joint plate and the holes of the bracket 29. The heads of the bolts 32 are stored in recesses 33 provided in the wooden beams 26A, 26B so as not to fly out of the front of the wooden beams 26A, 26B. Further, in this example, a tapered surface TP is formed at the front end of the wooden beam 26A to prevent a vehicle colliding from the collision direction 34 from digging into the end surface of the wooden beam 26A.
[0033]
In the wooden protection fence 28 having the above-described configuration, the wooden beams 26A and 26B are firmly fixed to each other by the H-shaped joint plate 31, so that mutual holding in the tensile direction can be strengthened.
[0034]
By the action of the collision load received from the collision direction 34, a strong tensile force acts between the wooden beams 26A and 26B near the joint. Therefore, a deforming force in the left-right direction in FIG. 9 also acts on the bracket 29. Here, in the present invention, since the joint plate 29 has an expansion force of 2 tons or more, the elongation and deformation of the bracket 29 can be suppressed, and the breaking stress acting between the wood beams can be reduced.
[0035]
The wooden protective fence 35 shown in FIGS. 10 and 11 is based on the composite coupling 36. That is, in the composite coupling 36 of the present invention, the bracket 38 is joined to the main body 37 of a cylindrical material. The front surface of the cylindrical portion is open. At the upper and lower ends, mounting holes 36H for connecting wooden beams inserted from both ends are vertically formed. Since the surface of the body portion 37 on the side of the bracket portion 38 communicates integrally, this portion has a joint plate function.
[0036]
In the composite coupling 36 of the present invention, a hole 39 is formed in a rear portion of the bracket portion 38. Therefore, it can be attached to the steel pipe support 20 using the bolt 40 and the nut 41.
[0037]
Wooden beams 42A and 42B are inserted from both ends of the composite coupling 36 attached to the steel pipe column 20, and can be interconnected by hanging nuts from below. The ends of the wooden beams 42A and 42B are cut in accordance with the diameter of the composite coupling 36. The cutting end is formed on the tapered surface TP.
[0038]
According to the wooden protective fence 35 using the composite coupling 36 shown in FIGS. 10 and 11, the composite coupling 36 has a function of a joint plate for stopping the tension of the wooden beams 42A and 42B in the tensile direction, so that the cushioning is performed as in the previous example. Due to the collision from the direction 34, the wooden beams 42A and 42B are in tension and have high strength and high function. Since the composite coupling 36 integrates the bracket portion 38, it is possible to provide a wooden protective fence that is easy to attach and that is excellent in design.
[0039]
The wooden protective fence shown in FIG. 12 is different from those of FIGS. 10 and 11 in that the bracket part 38 is omitted. That is, the coupling 44 of the present invention has a shape obtained by removing the bracket portion 38 from the composite coupling 36 shown in FIG. 10, and is formed by the bolt 21 inserted between the wooden beams 42A and 42B shown in FIG. , Fixed to the support 20. In the coupling 44 of the present invention, since the bracket portion 38 is omitted, the cushioning function of the space portion 30 shown in FIG. 9 cannot be expected. However, since it has a simple configuration, a cheap wooden protection fence 45 can be installed.
[0040]
The wooden protective fence 46 shown in FIG. 13 is an assembly type composite coupling 47 to the composite coupling 36 shown in FIGS. 10 and 11.
[0041]
The assembled composite coupling 47 of the present invention has a main body 48 and a cover 49. The main body 48 has a shape in which a joint plate 50 having an arc-shaped cross section and a bracket surface 51 abutting on the cylindrical portion of the steel pipe support 20 are interconnected by a lower plate 52 and an upper plate 53. The joint plate 50, the upper plate 53, and the lower plate 52 are obtained by bending a single plate material.
[0042]
The cover member 49 is formed of a bent material having a U-shaped cross section having a width that can be fitted to the upper and lower surfaces of the upper plate 53 and the lower plate 52, and is fitted with both ends of the wooden beams 42A and 42B. It is a form that can be combined.
[0043]
A pair of holes 54 for mutual bonding is provided on the upper and lower bonding surfaces of the main body 48 and the cover 49 respectively. Further, a pair of holes 49H for fixing the ends of the wood beams 42A and 42B are formed in the upper and lower surfaces of the cover 49, respectively.
[0044]
In the above configuration, the main body 48 is fixed to the steel pipe support 20 using the bolt 40. Next, the cover portion 49 is fitted from the front side of the main body portion 48, a bolt (not shown) is inserted into the hole 54, and is fixed with a nut. Next, the ends of the wood beams 42A, 42B are inserted, and bolts (not shown) are inserted through the holes 49H to fix the wood beams 42A, 42B.
[0045]
With the assembly type composite coupling 47 having the above-described configuration, the wooden plates 42A and 42B can be fixed along the joint surface of the joint plates 50 along the joint surfaces. The end faces of the wooden beams 42A and 42B are covered with the cover 49, so that the wooden protective fence 46 is excellent in function and design.
[0046]
The present invention is not limited to the above-described embodiment, and can be implemented in various modes by making appropriate design changes without departing from the gist of the present invention. Although the wooden beam is shown as an example of a log, the beam may be a square beam or a plate.
[0047]
【The invention's effect】
INDUSTRIAL APPLICABILITY As described above, the present invention is a wooden protective fence configured to connect a wood beam laid on a column with a connecting bolt at a position 9 to 27% of the length of the wood beam via a joint plate. Therefore, the wooden protective fence can be made flexible and high-strength, and the wooden beam does not break at the column, and the acceleration of the small vehicle can be reduced to 9 g or less.
[0048]
If a space structure is provided between the column and the joint plate to enhance the cushioning function at the time of a vehicle collision, the impact applied to the vehicle can be further reduced, and the safety is further improved.
[0049]
If a reinforcing band is provided along the wooden beam via the joint plate, the tension of the continuous wooden beam and the reinforcing band connected by the joint plate can be united, making the wooden protective fence more flexible and high-strength. It can be. Further, since the wooden beam diameter can be reduced, the cost can be reduced accordingly.
[0050]
When the wooden beam is composed of a plurality of rod-shaped members, the height from the road surface to the lower surface of the lowermost wooden beam is 250 to 350 mm, the interval between the wooden beams is 50 to 250 mm, and the height from the road surface to the upper surface of the uppermost wooden beam. 1000 mm or less, the overhang dimension of the wooden beam from the column to the road side is 60 mm or more, and the difference of the overhang size of each step wooden beam to the pillar-like road side is 60 mm or less, the scenery is good, and the vehicle can be penetrated. It can be a high-performance wooden protective fence without climbing over.
[Brief description of the drawings]
FIG. 1 is a side view of a support portion of a wooden protective fence according to an embodiment of the present invention.
FIG. 2 is a plan view of the wooden protective fence shown in FIG.
FIG. 3 is an enlarged perspective view showing a joint plate used for the wooden protective fence shown in FIGS. 1 and 2;
FIG. 4 is a side sectional view showing a structure for attaching a wooden beam to a support.
FIG. 5 is a side sectional view showing another embodiment of another mounting structure of the wooden beam to the support.
FIG. 6 is a characteristic diagram of a displacement amount (entering stroke) for each column, showing an example in which the joint plate of the present invention is used together with a comparative example.
FIG. 7 is a perspective view showing an embodiment of a flat joint plate in the case where a support is made of a steel pipe.
FIG. 8 is a perspective view showing an example in which an arc-shaped joint plate is applied to a steel pipe support.
FIG. 9 is a plan view of the bolt at the height of FIG. 8;
FIG. 10 is a perspective view of a composite coupling material combining a joint plate function and a bracket function.
FIG. 11 is a plan view of FIG. 10;
FIG. 12 is a side cross-sectional view of a simple coupling material in which a spatial structure in a bracket function part is omitted.
FIG. 13 is a perspective explanatory view of an assembled composite coupling material in which a joint plate function, a bracket function, and a cover function are combined.
[Explanation of symbols]
1 road
2, 27, 28, 35, 45, 46 Wooden guard fence
3 props
4, 5, 26, 26A, 26B, 42A, 42B Wooden beam
6 Underground
7 Steel tube resistance
8 legs
9 concrete moldings
10 pedestal blocks
11, 24, 35 Joint plate
12 Joint plate mounting holes
13 Wooden beam mounting holes
14 U-shaped connecting bolt
15, 22, 41 Nut
16 Reinforcement belt
17 Cushion material
18 Characteristic diagram without joint plate
19 Characteristic diagram with joint plate
20 Steel pipe support
21, 32, 40, 43 volts
23, 29 Bracket
25R, 25L hole
30, 39, 54, 49H space
33 recesses in wooden beam
34 Impact direction
36 Composite coupling
37, 48 Main unit
44 Coupling
47 Assembling type composite coupling
49 Cover
50 Joint plate
51 Bracket surface
52 lower plate
53 upper plate
H1 Height from the road surface to the bottom of the bottom wooden beam
H2 Spacing between wooden beams
H3 Height from the road surface to the top of the top wooden beam
TP tape surface
L Length of steel pipe
D Outside diameter of steel pipe
BK block out
ΔK Difference in overhang size of each wooden beam
A1 Joint plate specified value
A2 Length of joint plate

Claims (4)

A wooden protective fence formed by continuously joining wooden beams of a length determined in accordance with the unit span of the above-mentioned pillars continuously inside the ground portion of a plurality of pillars erected along the road side of the road. hand,
A 9-27% length of the length of the wooden beam is defined as a specified value around the joint position of the wooden beam, and a joint plate having a larger length and an expansion force of 2 tons or more is horizontally moved. Placed in
A wooden fence, wherein the joint plate and the wooden beam are connected to each other via a mounting hole drilled in the wooden beam corresponding to the specified value of the joint plate, and these are fixed to the column. . The wooden protective fence according to claim 1, wherein a space structure for enhancing a buffer function at the time of a vehicle collision is interposed between the column and the joint plate. The wooden fence according to claim 1, wherein the joint plates are interconnected by a high-expansion stiffening band disposed along the wooden beam. The wooden protection fence according to claim 1, wherein all of the following conditions (1) to (5) are satisfied when the wooden beam is composed of a plurality of rod-shaped members. fence.
(1) The height from the road surface to the lower surface of the lowermost wooden beam is H1 = 50 to 350 mm;
(2) The interval between the wooden beams is H2 = 50 to 250 mm;
(3) The height from the road surface to the top of the uppermost wooden beam is H3 ≦ 1000 mm;
(4) The overhang dimension of the wooden beam from the support to the road side is BK ≧ 60 mm,
(5) The difference of the overhang dimension of each step wooden beam from the column to the road side is ΔK ≦ 60 mm.

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