JP2005188031A - Strut for protective fence - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a strut for a protective fence capable of securely absorbing impact force by the collision of a vehicle and having excellent economic efficiency, workability, and aesthetic appearance by improving the structure of the struct, more specifically by forming a portion buckling in advance in the strut beforehand in vertically installing the strut of such a type that is formed of a hollow member with closed section such as a round metal tube and a square metal tube on a base plate fixed to a concrete foundation. <P>SOLUTION: This strut 1 for the protective fence is vertically installed on the base plate 2 fixed to the concrete foundation and absorbs the impact force caused by the collision of the vehicle. The strut 1 is formed of the hollow member with closed section. A cutout shaped opening 1a is formed at the lower portion thereof on the opposite side of a roadway as viewed from the side of the vehicle. A reinforcement plate 3 is installed at the opening 1a formed in the cutout shape. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention belongs to the technical field of a protective fence installed along the boundary between a roadway and a sidewalk, and more specifically, relates to a protective fence post that absorbs an impact force caused by a vehicle collision and enhances the safety of an occupant.

  Conventionally, with respect to protective fences for roads, bridges, etc., in order to minimize the damage of accidents by absorbing the impact force caused by the collision of vehicles and to protect the safety of passengers (hereinafter referred to as “ Various ideas have been made on the structure of the column (abbreviated as “post”) (see, for example, Patent Documents 1 to 8).

As for the standing method of the column, there is a base plate type (see, for example, Patent Documents 1 to 7) where the column is erected on the base plate fixed to the concrete base, and a conventional embedding where the column is embedded in the ground. There are types (see, for example, Patent Document 8).

  The structure of the support is roughly divided into a type implemented by a hollow member having a closed cross section such as a round metal tube or a square metal tube (for example, see Patent Documents 1 and 2), and a flange and a web having a substantially H-shaped cross section. Alternatively, there is a type (see, for example, Patent Documents 3 to 7) formed into an I shape.

  However, if the base plate type using the former type of support is simply implemented as it is, it will stretch against the impact force P due to the collision of the vehicle as shown in FIG. Since there is no portion, the welded portion b of the support column a breaks without buckling, and the impact force due to the collision of the vehicle cannot be absorbed.

  Therefore, in order to make the former type of column, that is, a column of a type implemented with a hollow member having a closed cross section such as a round metal tube or a square metal tube, a structure of the column to absorb the impact force caused by the collision of the vehicle. A devised technique has been developed (see, for example, Patent Documents 1 and 2).

  The protective fence post disclosed in Patent Document 1 is an upright portion that is erected substantially at the center of the base plate and that is thicker than the other side facing one side, and a base plate from both ends of the thick portion of the upright portion. It is comprised from the reinforcement rib attached in the diagonally enlarged direction toward the above, and the support | pillar main body which inserts in the said standing part and couple | bonds a lower end part (refer Claim 1 and FIG. 1).

  According to this protective fence post, when the impact force due to the collision of the vehicle acts on the post, the thin part of the standing part constituting the post extends and plastically deforms, so it can be absorbed as plastic energy, It is possible to prevent the vehicle from dropping out of the roadway due to the breakage of the column.

  The protective fence post disclosed in Patent Document 2 is provided with a center stiffener fixed vertically in a direction parallel to the fence material such as a beam on the upper surface of the base plate, and the post is vertically upward from its lower end. A notch having a height corresponding to the height of the center stiffener and a width corresponding to the thickness of the center stiffener is provided, and the center stiffener is fitted into the notch, and the contact edges of both are joined by welding (claims 1 and 1). reference).

  According to this protective fence support, when an impact force caused by a vehicle collision is applied to the support, it is absorbed as elastoplastic energy accompanying the bending of the center stiffener, as shown in FIG. It is possible to prevent the vehicle from falling off the roadway due to the breakage of the support column.

Japanese Utility Model Publication No. 3-51487 JP-A-11-117245 Japanese Utility Model Publication No. 60-331 Japanese Utility Model Publication No. 61-121216. Japanese Utility Model Publication 6-11969 Japanese Utility Model Publication 6-11969 JP 2001-234515 A Japanese Patent Publication No.42-6707

  In the guard fence post disclosed in Patent Document 1, the upright portion must be structurally designed and processed by distinguishing the wall thickness from the thin wall portion and the thick wall portion. Since it is an indispensable component, the cost increases and it is uneconomical. In addition, since the number of members to be constructed on site is large, workability is poor and it is very troublesome.

  The protective fence support disclosed in Patent Document 2 has a simple structure and a small number of members, and the above-mentioned problems are not found. However, since the center stiffener protrudes from the support, there is room for improvement in terms of landscape. Moreover, since it is necessary to devise the welding of the contact edge portion between the center stiffener and the lower end portion of the support column, there is room for improvement in terms of workability.

  An object of the present invention is to provide a structure of a supporting column when a supporting column of a type implemented by a hollow member having a closed cross section such as a round metal tube or a rectangular metal tube is erected on a base plate fixed to a concrete base. In addition, it is possible to absorb the impact force due to the collision of the vehicle surely by providing the buckling part in advance in the column in advance, and it is very economical and workability and landscape. It is to provide excellent guard fence posts.

As means for solving the problems of the prior art, the protective fence support according to the invention described in claim 1 is as shown in FIGS.
A support fence post 1 that stands on a base plate 2 fixed to a concrete base and absorbs an impact force caused by a vehicle collision,
The support column 1 is a hollow member having a closed cross section, and a notch-shaped opening 1a is formed in a lower portion on the opposite side of the roadway as viewed in the side surface direction.
A reinforcing plate 3 is attached to the notched opening 1a.

  The invention described in claim 2 is the guard fence support described in claim 1, characterized in that the support 1 is a square metal tube or a round metal tube.

  According to a third aspect of the present invention, in the guard fence support according to the first or second aspect, the notch-shaped opening 1a has a V-shape that is wide toward the side opposite to the roadway when viewed in the lateral direction. It is formed in a shape or a U-shape.

  According to a fourth aspect of the present invention, in the guard fence post according to any one of the first to third aspects, the notch-shaped opening 1a is formed at a height of 1 of the total height of the post 1 from the base plate 2 upward. It is characterized by being formed in a portion of about / 5 to 1/3.

According to a fifth aspect of the present invention, in the guard fence support according to any one of the first to fourth aspects, the reinforcing plate 3 is formed in a shape along the edge of the notch-shaped opening 1a. It is characterized by that.

According to a sixth aspect of the present invention, in the guard fence support according to any one of the first to fifth aspects, the reinforcing plate 3 is a V-shaped material or a U-shaped material.

  The invention described in claim 7 is characterized in that, in the guard fence support according to any one of claims 1 to 6, the reinforcing plate 3 is formed with a curved outer peripheral edge.

  The invention described in claim 8 is the protective fence support according to any one of claims 1 to 7, wherein the reinforcing plate 3 is sized to fit in the outer peripheral shape of the support 1 when viewed in the planar direction. It is characterized by that.

  According to the guard fence support according to the present invention, a notch-shaped opening 1a is formed in the lower part so that the lower part of the support 1 opposite to the roadway is easily buckled, and the reinforcing plate is formed in the opening 1a. 3 is attached, and when an impact force due to a vehicle collision is applied to the support column 1, the lower part of the support column 1 buckles and can absorb the impact force as quickly as possible, and the support column 1 breaks. There is no fear. Therefore, it is possible to reliably prevent the vehicle from falling off the roadway due to the breakage of the support column 1.

  The support column 1 is economical because it has a structure in which a hollow member having a closed cross section such as a general-purpose round metal tube or square metal tube is cut out and a reinforcing plate 3 is welded thereto. Is excellent. Moreover, since the said site | part to weld is a site | part where the impact force by the collision of a vehicle acts as a compressive force, high welding precision is not requested | required and it is excellent in workability.

  Since the number of members to be constructed on site can be reduced as much as possible, workability is good and economical. Moreover, since there is no member which protrudes outward from the support | pillar 1, and the site | part which provides the reinforcement plate 3 in the notch-shaped opening part 1a is a location which is not conspicuous in the downward position, it is excellent in scenery property.

  Furthermore, the size of the support 1 and the depth and width (height) and shape of the notch-shaped opening 1a with respect to the installation position of the fence material such as a beam, pipe or wire cable, and the shape of the reinforcing plate 3 -By appropriately designing the structure such as the plate thickness, the energy absorption function is excellent on average even when subjected to impacts of various magnitudes due to vehicle collisions. Specifically, it can be carried out in such a way that the car that has collided is repelled, or the prop 1 is destroyed and the protective effect is not lost. It also contributes to prevention. In addition, since the initial stiffness can be adjusted, a design method adapted to the assumed accident situation can be easily implemented.

  The protective fence post 1 according to the present invention supports a fence material (not shown) such as a beam, pipe, or wire cable to form a so-called protective fence such as a guard rail, a guard pipe, or a guard cable. It is preferably implemented as one that absorbs force.

  Specifically, the support fence post according to claims 1 to 8 is a base plate 2 for fixing a support column 1 of a type implemented by a hollow member having a closed cross section such as a round metal tube or a square metal tube to a concrete base. In order to implement a stand-up on the top, it is possible to absorb the impact force caused by the collision of the vehicle without fail, as well as to achieve a protective fence post with excellent economic efficiency, workability and landscape. To be implemented.

  1-3 has shown the structure of the support | pillar 1 for guard fences which concerns on this invention. This protective fence post 1 is erected on a base plate 2 fixed to a concrete base installed on the ground or the like by fixing means such as welding or bolts. The support column 1 is a hollow member having a closed cross section, and has a notch-shaped opening 1a as viewed in the side direction as shown in FIG. A reinforcing plate 3 is attached to the notched opening 1a. Incidentally, in the illustrated example, the receiving material 4 having a shape suitable for supporting the fence material is attached to the upper end portion of the support column 1, but it is of course possible to carry out the operation without using the receiving material 4 ( (Invention of Claim 1)

  The strut 1 is implemented using a square steel pipe as a hollow member having a closed cross section. In addition, the cross-sectional structure of the support column 1 is not limited to a square shape, and as shown in FIG. Moreover, the material of the support | pillar 1 is not limited to a steel pipe, It can implement in substantially the same way also with an aluminum pipe (metal pipe). (Invention of Claim 2). Incidentally, the size of the square steel pipe 1 in the illustrated example is such that the cross section is 125 mm × 125 mm × 6 mm and the height is 870 mm, but it is of course not limited thereto.

  The notch-shaped opening 1a formed in the support column 1 is formed so as to have a wide V-shape toward the side opposite to the roadway when viewed in the side surface direction. The shape of the opening 1a may be any shape as long as the support column 1 can buckle by satisfactorily absorbing the impact force caused by the collision of the vehicle. For example, the U-shape shown in FIG. The present invention can be carried out in the same manner (the invention according to claim 3).

  The design dimensions such as the height position for forming the notch-shaped opening 1a and the depth of cut are such that the strut 1 absorbs impact energy satisfactorily against the impact force caused by the collision of the vehicle. It is required according to the structural design that buckles. As a result, the height position of the notch-shaped opening 1a in the illustrated example is formed at a site of about 200 mm upward from the base plate 2 (the invention according to claim 4). The design dimensions of the opening 1a are a right-angled isosceles triangle having a cutting depth of 25 mm and a width (height) of 50 mm.

  The design position such as the height position at which the notch-shaped opening 1a is provided and the depth and angle of cut can be flexibly changed according to the structural design. Incidentally, the height position of the notch-shaped opening 1a is preferably formed at a portion of about 1/5 to 1/3 of the total height of the support column 1 from the base plate 2 upward (Claim 4). Invention). In addition to the design dimensions of the illustrated example, when the overall height of the support column 1 is 500 mm, the impact energy can be absorbed well if the notched opening 1 a is formed in a portion about 150 mm upward from the base plate 2. It is known from the implementation results.

  The reinforcing plate 3 is preferably formed by being formed into a shape along an edge of the notch-shaped opening 1a (the invention according to claim 5). Although it may not be possible to implement in a shape that does not follow the edge of the opening 1a, as in the present embodiment, the opening 1a is sealed with a reinforcing plate 3 that is shaped along the edge of the opening 1a. Then, there is an advantage that the support strength of the support column 1 can be permanently maintained by blocking intrusion of moisture, salt, and the like by rainwater, and the function of the protective fence is not permanently impaired.

  Therefore, the reinforcing plate 3 according to the present embodiment is formed by bending a square steel plate having a size of 41 mm × 119 mm and a thickness of 6 mm into a V shape so as to correspond to the shape of the opening 1a, As shown in FIG. 4, the opening 1 a is tightly placed without any gap and is fixed by all-around welding. As shown in FIG. 8, the reinforcing plate 3 may be bent and formed into a U shape when the notched opening 1 a is viewed in the side surface direction and implemented in a U shape. Preferred (invention of claim 6).

  In consideration of safety and landscape, the reinforcing plate 3 has a size that fits in the outer peripheral shape of the support column 1 when viewed in the plane direction, and has a corner portion that is curved and rounded. It is preferable to do this (inventions of claims 7 and 8). The design dimension of the reinforcing plate 3 is not limited to this, and it is of course possible to change the design as appropriate according to the shape and size of the opening 1a. In particular, the plate thickness of the reinforcing plate 3 affects the impact energy absorption efficiency together with the size and shape of the notch opening 1a formed in the support column 1. Note that adjustments will be made accordingly. Incidentally, when the support column 1 is implemented by a round steel pipe, the reinforcing plate 3 has a notch shape that is elliptical when viewed in the front direction according to the shape of the support column 1 as shown in FIG. It is preferable that the elliptical steel plate is bent at a required angle so as to substantially coincide with the opening 1a.

  Therefore, according to the protective fence post 1 having the above-described configuration, as shown in FIGS. 5 and 6, when the impact force P due to the collision of the vehicle is received, the support post 1 according to the magnitude of the impact force P. Is subjected to bending deformation, the notch-shaped opening 1a provided in the support column 1 and the reinforcing plate 3 (hereinafter referred to as the reinforcing plate 3 attachment site) are crushed, and the support column 1 is gradually inclined backward. Become. When the initial rigidity of the reinforcing plate mounting part reaches the yield limit, after that, as the bending deformation progresses, it exerts a large plastic energy absorption capacity, and the effect of reducing vehicle accident damage and occupant injury as much as possible is demonstrated. To do. The magnitude of the initial rigidity of the support column 1 can be flexibly adjusted by designing the shape and size of the opening 1a and the plate thickness of the reinforcing plate 3 appropriately.

  As described above, according to the protective fence support column 1 described in claims 1 to 8, as described in the above-mentioned [Effects of the invention], it is of course possible to reliably absorb the impact force caused by the collision of the vehicle. Thus, it is possible to realize a protective fence post that is extremely excellent in economy, workability, and landscape.

It is the perspective view which showed the support | pillar for protection fences concerning this invention. It is the side view which showed the support | pillar for protection fences concerning this invention. It is the front view which showed the support | pillar for protection fences concerning this invention. It is the exploded perspective view showing the support fence post concerning the present invention. It is the side view which showed the state in which the support | pillar for protection fences which received this invention received the impact force by the collision of a vehicle, and inclined. It is the perspective view which showed the state in which the support | pillar for protection fences concerning this invention received the impact force by the collision of a vehicle, and inclined. It is the perspective view which showed the other Example of the support | pillar for protection fences which concerns on this invention. It is the side view which showed a part of other Example of the support | pillar for protection fences which concerns on this invention. It is the perspective view which showed the prior art.

Explanation of symbols

1 Support 1a Notch-shaped opening 2 Base plate 3 Reinforcement plate 4 Receiving material P Impact force

Claims (8)

A support fence post that stands on a base plate fixed to a concrete base and absorbs impact force caused by a vehicle collision,
The support column is a hollow member having a closed cross section, and a notch-shaped opening is formed in a lower part on the opposite side of the roadway as seen in the side surface direction.
A support fence post, wherein a reinforcing plate is attached to the notch-shaped opening.   The support fence post according to claim 1, wherein the support pillar is a square metal pipe or a round metal pipe.   The notch-shaped opening is formed in a V-shape or U-shape that is wide toward the opposite side of the roadway when viewed in the side surface direction. Guard post.   The notch-shaped opening is formed in a portion of about 1/5 to 1/3 of the total height of the support column upward from the base plate. The protective fence post described.   The support plate according to any one of claims 1 to 4, wherein the reinforcing plate is formed in a shape along an edge of the notch-shaped opening.   The support fence post according to any one of claims 1 to 5, wherein the reinforcing plate is a V-shaped material or a U-shaped material.   The support fence post according to any one of claims 1 to 6, wherein the reinforcing plate has an outer peripheral edge formed in a curved shape.   The support fence post according to any one of claims 1 to 7, wherein the reinforcing plate has a size that fits in an outer peripheral shape of the support when viewed in a planar direction.