JP2002250387A - Energy absorbing support structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a support structure adoptable in an FRP support, too, having no plastic region without absorbing energy at the time of a collision of a vehicle by deformation energy in the plastic region of a support, having an excellent execution property and easy to be replaced. SOLUTION: This energy absorbing support structure is characterized by arranging energy absorbing members made of cross sectional surfaces having cylindrical shapes, square cylindrical shapes or parallel cross shapes between a mounting flange provided on the lower part of the support and a concrete body or on the upper and lower sides of the mounting flange and coupling the energy absorbing members and the body, in the support of the structure in which the mounting flange is fastened with an anchor bolt buried in the body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pillar suitable for mitigating energy at the time of collision with a vehicle or the like in a protective fence, a sound barrier, a streetlight, a traffic light, a traffic light, a road sign, a sign, etc. installed on a road shoulder. And the joint structure between the frame and the body.

[0002]

2. Description of the Related Art Metal pillars such as conventional protective fences and signs are
In addition to a structure that is inserted into a hole made in a body such as concrete, a structure that directly fastens a mounting flange provided at a lower portion of a support column with an anchor bolt or the like buried in the body is generally used. Is intended to alleviate the energy caused by the collision by plastically deforming the column body.

[0003] In recent years, there are increasing opportunities to adopt the latter fastening method from the viewpoints of workability when replacing a damaged post, and the necessity of rebuilding the frame. However, although it has the advantage of good workability, steel columns have problems with durability such as rust, and maintenance costs such as repainting etc.
There is a problem that the maintenance cost is high, and conversion to a stainless steel, aluminum, FRP-coated metal column, or the like is being studied.

In any case, the energy at the time of the collision of the vehicle is tremendous, and the column body must be greatly deformed in order to absorb the energy at the time of the collision, but the mounting moment at the lower portion of the column becomes large. Therefore, it is necessary to increase strength and rigidity.

[0005] In other words, this leads to a contradiction that it must be easily deformed and have high strength and rigidity. In particular, protective fences have restrictions on the height of the support from the viewpoint of landscape, etc., the bending moment is even larger, the support lower structure is large, the support is less likely to deform, and the support body plastic deformation However, there is a limit to ensuring energy absorption performance.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is not to absorb the energy at the time of collision of a vehicle or the like with the deformation energy of the plastic region of the column, and to disclose the F region having no plastic region.
An object of the present invention is to provide a support structure which can be adopted for a RP support, has excellent workability, and is easily replaced.

[0007]

Means for Solving the Problems In order to solve the above problems, an energy absorbing support according to the present invention has the following (1) to (4).
It has the configuration of (2). (1) A support having a structure in which a mounting flange provided at a lower portion of a support is fastened by an anchor bolt or the like embedded in a skeleton of concrete or the like, and is provided between the mounting flange and the skeleton or the mounting flange. An energy absorbing support structure, wherein energy absorbing members are disposed above and below the energy absorbing member, and the energy absorbing member and the frame are connected to each other. (2) The energy absorbing support structure according to the above (1), wherein the energy absorbing member is an energy absorbing member having a cylindrical cross section, a rectangular tube shape, or a cross-girder shape.

[0008] According to the above-mentioned strut having the structure according to the present invention (1) or (2), the energy at the time of collision of a vehicle or the like can be efficiently absorbed without plastic deformation of the strut body.

Further, according to the present invention, the seemingly contradictory required performance of plastic deformation can be maintained while maintaining the strength and rigidity of the strut, and the strut that can withstand the load at which the energy absorbing member starts to break can be designed. The structure can be made smaller, lighter, and workability is improved.

Furthermore, since it is not necessary to provide the support with a plastic deformation function, the F is lightweight, does not rust, and has excellent formability.
A column made of RP can also be realized.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an energy absorbing support structure 1 according to the present invention, in which an attachment flange 3 provided at a lower portion of a support 2 has an anchor bolt / nut 5a embedded in a frame 4 made of concrete or the like. , 5b, in which an energy absorbing member 6 is arranged between the mounting flange 3 and the skeleton 4 and is connected to the skeleton 4.

In FIG. 1, an arrow A indicates a support 2 at the time of collision.
The arrow B indicates the direction of the force applied as a reaction force to the energy absorbing member 6 by the mounting flange disposed at the lower part of the support, and the reaction force B starts the deformation or destruction. It becomes.

Here, in the present invention, the reason why the energy absorbing member 6 is provided at the lower portion of the column 2 is that if there is a space where a large deformation stroke can be taken, the energy absorbing member 6 may be provided at any place. Although it can be said, pillars such as protective fences such as road shoulders, soundproof walls, streetlights,
This is because the landscape and the mounting space are limited, and there is a situation in which a large deformation stroke cannot be obtained. Therefore, it is effective to dispose the energy absorbing member below the support. In other words, the provision of the lower portion of the column has an advantage that the inclination angle is small and the deformation stroke can be reduced in the lower portion of the column that is cantilevered.

FIG. 2 is an enlarged sectional view showing the state of attachment near the energy absorbing member 6 in FIG. 1. Reference numeral 7 denotes a metal plate, which is used to maintain the surface hardness and smoothness of the contact surface with the energy absorbing member 6. Used for The reason for this is that the concrete body and the FRP have low hardness and poor surface condition. If the surface hardness is low, the energy absorbing member may bite, and suitable deformation (destruction) may not occur. The surface hardness is Brinell hardness H _B
Is preferably 90 or more, more preferably H _B
Metals with a value of 120 or more are preferred.

The shape of the energy absorbing member 6 is, for example,
The cross-sectional structure is preferably a cylindrical energy absorbing portion 6a as shown in FIG. 3, a prismatic energy absorbing portion 6b as shown in FIG. 4, a cross-shaped energy absorbing portion 6c as shown in FIG. The surface structures are not particularly limited to those shown. That is, for example, triangular cylinder, H
It may have a shape like a mold, and is not particularly limited. The material of the energy absorbing member may be a metal such as iron or stainless steel, a non-ferrous metal such as aluminum, or may be made of FRP.

However, in the case of a metal energy absorbing member, energy is absorbed by locally buckling the cylindrical wall surface or the like, and the wall surface is plastically deformed like a drum drum. However, there remains a problem that the deformed portions overlap and the deformation stroke cannot be increased. Further, the load that causes local buckling depends on the material of the metal, and it is often difficult to determine the buckling starting point.

On the other hand, in the case of FRP, energy is absorbed by destruction by utilizing the property of a brittle material.
The entire length (height) of the member can be set to the breaking stroke amount (energy absorption amount), and the efficiency is high.
It is more preferable because it has a feature of being lightweight and not rusting.

Further, the breaking load of the FRP can be estimated as the compressive strength of the FRP in the load direction. By appropriately selecting the fiber orientation direction of the FRP reinforcing fiber in a predetermined amount, that is, the thickness thereof, There is an advantage that it can be easily designed according to the direction of the required strength. However, in the case of FRP,
In order to raise the fracture starting point from the end, it is important to reduce the cross-sectional area of the end, so that it is more preferable to provide a chamfer, a notch, or a slit, for example.

As the reinforcing fiber of the FRP energy absorbing member, glass fiber, aramid fiber, carbon fiber, or the like can be usually used. Lightweight and high strength FRP
Although carbon fibers are most preferred in order to obtain, they may be used alone or in combination thereof, for example, a hybrid combination of glass fiber and carbon fiber in order to balance cost.

As the form of the fiber used, a cloth or a strand can be preferably used. Furthermore, the type of carbon fiber used is not necessarily limited in view of the high strength and rigidity of the carbon fiber, but also considering the lower cost, the use of so-called large tow carbon fiber is recommended. Most preferred. For example, the number of filaments of one carbon fiber yarn is not less than ordinary 10,000 filaments,
It is preferable to use one in the range of 00 to 300,000, and more preferably, to use a tow-like carbon fiber filament yarn in the range of 50,000 to 150,000, so that the resin impregnation property and the reinforcement can be improved. It is preferable because it is more excellent in handleability as a fiber base material and furthermore economical of the reinforcing fiber base material.

The matrix resin in the FRP portion may be a thermosetting resin such as an epoxy resin, a phenol resin, an unsaturated polyester resin, a urethane resin, a melamine resin, or a thermoplastic resin such as ABS, nylon, polyethylene, or PEEK. Good.

In the case of FRP, there is basically no problem of rust generation and excellent corrosion resistance, so that maintenance costs such as repainting can be omitted. Also, filling the inside of the energy absorbing member with a foam such as urethane,
It is more preferable because it has an advantage that Euler buckling can be prevented.

FIG. 6 shows another embodiment, in which energy absorbing members 6 are arranged above and below the mounting flange 3, and
3 shows a support structure connected to a skeleton 4. FIG.

FIG. 7 shows an embodiment in the case of mounting on a side surface of another mounting frame 4. In this embodiment,
Since the input of the force at the time of the collision and the input to the energy absorbing member are in the same direction, the propagation of the force is smooth, and no bending force acts on the energy absorbing member, which is a more preferable structure.

[0026]

As described above, the energy absorbing strut according to the present invention starts destruction with a predetermined load between the mounting flange provided at the lower portion of the strut and the frame, or above and below the mounting flange. By providing the energy absorbing member, the force (energy) generated by the collision of the vehicle or the like can be continuously absorbed without plastically deforming the column body, so that the vehicle (passenger)
It is also possible to reduce the impact on the vehicle.

In addition, if the strut can withstand the load at which the energy absorbing member starts to break, the structure of the lower portion of the strut can be reduced.
Since the support structure including the energy absorbing member can be formed simply, it is lightweight and the workability is improved, especially from the viewpoint of landscape, etc. It can be suitably used for a column or the like.

The energy absorbing support structure of the present invention can be easily replaced after breakage, and can be reused if the support is slightly deformed. Further, since it is not necessary to provide the column with a plastic deformation function, a column made of FRP which is lightweight, does not rust, and is excellent in formability can be adopted.

[Brief description of the drawings]

FIG. 1 shows an energy absorption support structure according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing an attached state near an energy absorbing member in FIG.

FIG. 3 is a perspective view showing an example of a shape of an energy absorbing member according to an embodiment of the present invention.

FIG. 4 is a perspective view showing an example of a shape of an energy absorbing member according to one embodiment of the present invention.

FIG. 5 is a perspective view showing an example of a shape of an energy absorbing member according to one embodiment of the present invention.

FIG. 6 shows an energy absorbing support structure according to another embodiment of the present invention.

FIG. 7 shows another example of attachment in the energy absorption support structure of the present invention.

[Explanation of symbols]

 1: Shows the energy absorbing support structure 1. 2: Support column 3: Mounting flange 4: Frame 5a, 5b: Anchor bolt / nut 6, 6a, 6b, 6c: Energy absorbing member 7: Metal plate A arrow: Collision Direction of force input to strut at time B arrow: Direction of force applied to energy absorbing member

Claims (2)

[Claims] 1. A mounting flange provided at a lower portion of a column,
A support having a structure to be fastened with anchor bolts or the like embedded in a skeleton of concrete or the like, wherein an energy absorbing member is disposed between the mounting flange and the skeleton, or above and below the mounting flange, and An energy absorbing support structure, wherein an energy absorbing member and the skeleton are combined. 2. The energy absorbing column structure according to claim 1, wherein the energy absorbing member is an energy absorbing member having a cross-sectional shape of a cylinder, a square tube, or a girder.