JP2007113266A - Base fitting of support column for protective fence - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce amount of a material while maintaining load resistant strength against rupture and collapse at collision time required for a support column in an erection structure of the support column of base fixing system and erect the support column to prevent direct collision against a base plate and a bolt and a nut even in a vehicle having small vehicle height. <P>SOLUTION: This base fitting 1 for erecting and holding the support column 2 of a protective fence 3 installed on a road R side on an upper face of a wheel guard T is formed by a support column erection hole 1a in which a lower end side of the support column 2 is internally fitted and a base part 1b fixed on the wheel guard T. Height L1 from the wheel guard T of a road side wall part 7a in a hole wall part 7 of the support column erection hole 1a is set to be small, and height L2 from the wheel guard T of an opposite side wall part 7b is set to be large while fixed on the wheel guard T to prevent direct collision against the base fitting 1 of the vehicle S. A tightening wall part 8 for maintaining load resistant strength against rupture and collapse required for the support column 2 when the vehicle S collides against the protective fence 3 is provided. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a base metal fitting for a protective fence post, and more particularly, a ground fixing on a shoulder on the side of a roadway, a protective fence post installed along a median strip, etc. It is related with the base metal fitting used in order to make it stand by.

The purpose of the protective fence is to prevent the vehicle from jumping out of the roadway or falling down if it deviates from the driving lane (roadway), and to minimize damage to the driver and damage to the vehicle. Are installed along the ground cover on the shoulder of the roadway, and a plurality of columns that are erected at regular intervals along the ground layer, etc., and a horizontal beam fixed to the column. It is configured and installed.
When the vehicle deviates from the roadway (running lane), the vehicle contacts the cross beam, and the collision energy when contacting the cross beam is transmitted to the plurality of columns, and the energy is absorbed by the deformation of the columns and the beam. The damage is minimized.

  In this way, from the viewpoint of preventing the vehicle from jumping out or falling from the roadway, it is better that the protection fence has a higher rigidity and strength, but if it is made larger than necessary, the driver or There is a risk of serious damage to passengers. In addition, there is a possibility that a vehicle that contacts or collides with the protective fence may cause a secondary disaster such as being spun off the road by the protective fence and spinning, or jumping out to the opposite lane and colliding with another vehicle.

  For this reason, the protective fence can be configured so that when the vehicle collides, the entire protective fence, which is composed of a combination with the support including the horizontal beam, is plastically deformed to absorb and reduce the impact energy as much as possible. Desired. On the other hand, the struts are required to have a load-bearing strength that can support a constant impact load without breaking due to the collision force of the vehicle or collapsing from the standing base of the road shoulder against the ground cover. is there.

By the way, when the column is erected on the ground cover beside the roadway, etc., the embedding method is to attach the column directly to the ground cover by pouring the lower end side of the column into the standing hole provided directly in the ground cover and pouring mortar etc. In general, a base fixing method in which the lower end side of the support column is attached to the upper surface of the ground cover by an anchor bolt.
In recent years, it has become the mainstream to install a column using a base fixing method because it is easy to install, durability of the column (corrosion resistance), repairability after a vehicle collision, and installation on a bridge. Yes.

In addition, it is known to install a protective fence by erecting a support on a ground cover beside a roadway by a base fixing method (see, for example, Patent Document 1 and Patent Document 2).
Japanese Utility Model Publication No. 62-105274 (see [Example] on page 6 of specification, [Effects of device] on page 13 and FIGS. 1 to 4) Japanese Unexamined Patent Publication No. 2001-193029 (see paragraph numbers 0008 and 0010 of the specification and FIGS. 3 to 7)

By the way, as shown in FIG. 5, the base metal fitting 20 used for erecting the support column on the ground cover by the base fixing method known in Patent Document 1 and Patent Document 2 described above is a ground cover T or the like. In general, a base plate 21 fixed to the upper surface of the base plate 21 by an anchor bolt 23 is attached to a support member 22 raised in a substantially cylindrical shape at an appropriate height.
That is, when the base metal fitting 20 is fixed (installed) on the upper surface of the ground cover T, the height L3 from the ground cover upper surface of the support wall 22a of the support member 22 located on the roadway R side and the opposite side (for example, The structure is such that a substantially cylindrical support member 22 having the same height L4 as the support wall 22b located on the sidewalk or slope side) is attached to the base plate 21, whereby the lower end side of the column 24 Are attached by external fitting or internal fitting, and then the support 24 and the support member 22 are joined by welding or bolting, so that the support 24 is detached from the base metal fitting 20 due to the impact force when the vehicle collides. Or the lower end side of the support column 24 can be firmly coupled and held in a rigid state so as not to collapse. Further, reinforcing ribs 29 are provided around the support member 22 for strength reinforcement.

However, in the case of the cylindrical support member 22, the portions that act substantially effectively at the time of a vehicle collision are the portion of the support member 22 on the side opposite to the roadway and the lower end side located on the roadway R side. Most of the cylindrical portion of the support member 22 located on the side is a portion that does not work effectively.
Further, the base plate 21 is located at a position surrounding the outer periphery of the support member 22, and the anchor bolt 23 for fixing the base plate 21 to the ground cover T is also arranged on the roadway R side of the support member 22. The reinforcing rib 29 provided for strength reinforcement is also provided on the roadway R side of the column 24. For this reason, before the vehicle collides with the support column 24 or the cross beam, the lower end side of the support column 24 collides with the support member 22 or the reinforcing rib 29 of the base metal fitting 20 which is rigidly connected and held, and damage to the vehicle body is caused. Will be big. In addition, the landscape of the base portion of the column 24 is also deteriorated.
As described above, conventionally, there has been a problem that the vehicle collides with the anchor bolt 23 and the reinforcing rib 29 on the roadway R side before the vehicle is guided along the cross beam at the time of collision and the collision energy is absorbed.
In addition, such a problem is likely to occur particularly in a vehicle having a low vehicle height, and as a result, the vehicle body is not only greatly damaged, but also may cause a driver or a passenger to be damaged greatly.

  In addition, the fixing of the conventional base metal fitting 20 to the ground cover T with the anchor bolt 23 is as described above, and the base plate 21 is also located on the roadway side portion of the support member 22 and protrudes from the bolt insertion hole (not shown). The fastening structure is such that the nut 25 is attached to the anchor bolt 23, and the protruding end portion of the anchor bolt 23 and the nut 25 are formed as protrusions on the roadway R side on the upper surface of the ground cover T. As described above, even when the vehicle does not collide, there is a possibility that the tire may be damaged when the tire runs on the ground cover T.

  Therefore, the present invention was devised to solve such a conventional problem, and in the standing structure of the support by the base fixing method, the load resistance strength against breakage / collapse at the time of a collision required for the support is provided. In this state, the material that makes up the base plate is reduced, and even when the vehicle height is low, the column can be erected so that it does not directly collide with the bolts and nuts that secure the base plate and the base plate. The challenge is to provide a newly developed base bracket for the guard fence, and it also provides a guard bracket pillar bracket that has a good landscape (appearance) and good driver visibility. The task is to do.

  In order to solve the above-mentioned problem, in claim 1, a base metal fitting used for standing a guard fence post installed on a ground cover along a roadway on the ground cover, And a base portion fixed to the upper surface of the ground cover, and in a state of being fixed to the upper surface of the ground cover, Forming a height from the ground cover of the opposite side wall portion located on the opposite side of the roadway side to a height from the ground cover of the roadway side wall portion located on the roadway side of the hole wall; and The opposite side wall portion is a fastening wall portion with a support column.

  According to the structure of Claim 1, it can prevent that a vehicle collides directly with the hole wall part of a support | pillar standing hole by making the height from the ground cover of a roadway side wall part low. And by lowering the roadway side wall, the height of the opposite side wall from the ground cover is increased, so that even if the base metal fitting is formed with a small amount of material, it is required to break or collapse when the vehicle collides. A fastening wall portion with a support column that maintains the load bearing strength against the above can be formed on the opposite side wall portion.

  Moreover, in the state fixed to the upper surface of the said ground cover, the height from the ground cover of the said roadway side wall part is the total height with the height of the said ground cover from a roadway in the state fixed to the upper surface of the said ground cover. It is designed to be lower than the vehicle height of the vehicle.

  According to the structure of Claim 2, it becomes possible to implement | achieve the vehicle collision prevention which prevents that the vehicle of Claim 1 collides with the hole wall part of a support | pillar standing hole more effectively.

According to a third aspect of the present invention, the base portion is integrally formed on the side of the hole wall portion of the column erecting hole, and a bolt insertion hole for fastening with the ground cover is opened. And
Here, the side of the hole wall is a direction parallel to the horizontal beam constituting the protective fence (the horizontal direction of the horizontal beam between the columns).

  According to the configuration of the third aspect, in the state of being fixed (installed) on the upper surface of the ground cover, for example, the base portion fixed to the ground cover or the like by the anchor bolt is used on the roadway side of the column wall for the pillar standing This prevents the vehicle body from colliding with the base and bolts before the vehicle collides with the cross beam and prevents the tire from being damaged if the tire runs on the ground cover. it can. In other words, there are no protrusions such as nuts and bolts on the roadway side that may damage the tire when it gets on.

  According to a fourth aspect of the present invention, the base metal fitting according to any one of the first to third aspects of the present invention is integrally formed of a casting material.

  According to invention of Claim 4, a base metal fitting can be manufactured easily and toughly.

Since the base bracket of the support fence post according to the present invention is configured as described above, in the upright structure of the support by the base fixing system, the load bearing strength against breakage / collapse required for the support in the event of a vehicle collision In such a state, the column can be erected and held so as not to directly collide with the hole wall portion of the column erection hole of the base metal fitting even in a vehicle having a low vehicle height.
Furthermore, the effect that the external appearance (landscape) of the base of the support can be improved can be expected. In addition, the material cost of the base metal fitting can be expected to be saved.

Hereinafter, an embodiment of a base metal fitting for a protective fence post according to the present invention will be described in detail with reference to the drawings as appropriate.
FIG. 1 is a perspective view showing a base metal fitting for a protective fence post according to the present invention, and FIG. 2 is a perspective view showing an example of a state in which the protective fence is installed on the ground cover using the base metal fitting. 3 is an enlarged longitudinal sectional view showing the installation state, and FIG. 4 is a transverse sectional view of the same.

≪Explanation of protective fence≫
As shown in FIG. 2, the protective fence 3 includes upper and lower horizontal beams extending between a plurality of support columns 2 standing at regular intervals along a ground cover T constructed by placing foundation concrete beside the roadway R. It is configured by laying horizontally. And the standing of the support | pillar 2 on the ground cover T is performed by the base metal fitting 1 fixed to the upper surface of the ground cover T with the anchor bolt 6. FIG.
In the following, among the upper and lower horizontal beams, the upper side is referred to as the upper horizontal beam 4 and the lower side is referred to as the lower horizontal beam 5.

  As shown in FIG. 4, the column 2 has an outer shape (horizontal cross-sectional shape) that is substantially oval as a whole, and is plastically deformed when the vehicle S collides to absorb and relax the impact energy (for example, in JIS). It is extruded in a hollow shape by a material such as a standard alloy number A6061-T6). If it demonstrates in detail, the support | pillar 2 will exhibit the external shape which combined the circular arc and the ellipse arc. And as shown in FIG. 4, the roadway side part 2a of the support | pillar is a thick circular arc, and the opposite side part 2b is an elliptical arc thinner than the roadway side part 2a.

  The upper horizontal beam 4 and the lower horizontal beam 5 are extruded by a material such as an aluminum alloy like the column 2 and are not shown in the upper end portion of the column 2 and in the middle in the height direction as shown in FIG. It is extrusion molded so that it can be attached with mounting brackets such as brackets or bolts.

≪Description of base bracket≫
The base metal fitting 1 is a casting that is integrally formed with a sand casting material (for example, AC4CH-T6 defined in JIS H 5202 “aluminum alloy casting”). As shown in FIG. 2 is provided with a column erecting hole 1a in which the lower end side of 2 is fitted by internal fitting. And the base part 1b is integrally provided in the side of the hole wall part 7 of the support | pillar standing hole 1a. The side of the hole wall 7 is a direction parallel to the upper and lower lateral beams 4 and 5.

≪Explanation of the support hole ≫
The pillar standing hole 1a has the same shape as the outer shape (horizontal cross-sectional shape) of the pillar 2 and has almost the same dimensions. As shown in FIGS. 2 and 3, the base is formed on the upper surface of the ground cover T. In the state in which the metal fitting 1 is fixed (installed), the height L1 from the ground cover T of the roadway side wall part 7a located on the roadway R side in the hole wall part 7 is formed low.
And by forming the height L2 higher than the height L1 of the roadway side wall part 7a from the ground cover T of the opposite side wall part 7b located on the side opposite to the roadway side wall part 7a (for example, sidewalk or slope side). The opposite side wall portion 7b serves as a fastening wall portion 8 with the support column 2 (see FIGS. 1 and 3).
In the present embodiment, the height L2 of the opposite side wall portion 7b is set to be twice or more the height L1 of the roadway side wall portion 7a.

≪Description of hole wall≫
The hole wall portion 7 is formed of a roadway side wall portion 7a having a low height L1 and an opposite side wall portion 7b having a high height L2.
In this way, by increasing the height L2 of the opposite side wall 7b of the hole wall 7, the load when the vehicle S collides with the protective fence 3 (mainly the horizontal beam) is transmitted to the plurality of columns 2, Most of the load transmitted to the opposite side wall portion 7b is transmitted to the opposite side wall portion 7b, and is effective in improving the energy absorption performance due to plastic deformation such as buckling of the column 2.
On the other hand, the roadway side wall portion 7a is not subjected to much load when the vehicle S collides with the protective fence 3, so that it will not come off when the column 2 is plastically deformed by impact as will be described later. The height can be lowered to L1.

≪Explanation of roadway side wall≫
The roadway side wall portion 7a is formed so that the lower end side of the support column 2 holds the support column 2 only by fitting with the inner fitting, and even when the support column 2 is plastically deformed by the collision of the vehicle S, the support column 2 does not come off. It has a height L1. That is, the roadway side wall portion 7a does not receive a large load when the vehicle S collides with the protective fence 3 (is not received), and therefore has a height L1 that does not come off when the column 2 is plastically deformed by an impact. Can be lowered. Thereby, the material cost of the base metal fitting 1 can be reduced.
As shown in FIG. 3, the roadway side wall portion 7 a has a total height (L5 + L1) with a height L5 from the roadway R (road surface) to the upper surface of the ground cover T of the vehicle S traveling on the roadway R. The height L1 from the upper surface of the ground cover T is designed so as to be lower than the vehicle height L (the height from the ground contact portion of the tire that contacts the road surface to the lower surface (back surface) of the vehicle body). That is, according to the height L5 of the ground cover T from the roadway R, the height L1 of the roadway side wall portion 7a from the ground cover T is appropriately designed to be lower than the vehicle height L. .
Thereby, when a vehicle body part such as a bumper of the vehicle S collides with the protective fence 3, it does not directly collide with the base metal fitting 1. That is, collision damage to the vehicle S is reduced by the vehicle S colliding with the upper and lower horizontal beams 4 and 5 of the protective fence 3 without directly colliding with the base metal fitting 1 that does not absorb the collision energy. .
Further, as shown in FIG. 1, the roadway side wall portion 7a is thicker than the wall thickness of the side wall portion to be described later, and is gradually formed thicker (wider) downward.

≪Description of opposite side wall≫
The opposite side wall portion 7b has a lower end side of the support column 2 so that the load resistance strength against breakage / collapse (most collision load) required for the support column 2 can be maintained when the vehicle S collides with the protective fence 3. The height L2 from the ground cover T is designed so that it can be firmly coupled and held by a large area (area in the direction of the height L2) and the fastening force of several bolts 9.
In other words, the height L1 of the roadway side wall 7a is low so that the vehicle S having a low vehicle height L does not collide, but the opposite side wall 7b is formed high so that energy absorption by plastic deformation of the column 2 can be effectively performed. By doing so, the fastening wall portion 8 has a height L2 that can firmly hold the support column 2.
Further, the opposite side wall portion 7b is thicker than the side wall portion to be described later, like the roadway side wall portion 7a, and has a wall structure with high rigidity by being formed gradually thicker downward. The fastening wall portion 8 is used (see FIG. 1).
As shown in FIG. 1, two bolt insertion holes 10 are opened in the fastening wall portion 8, and a plate-like nut member 11 applied to the lower end side inner surface of the support column 2 is attached by a bolt 12. By bolting, the support column 2 is formed so as to be firmly and strongly bonded and held by a sandwich structure (clamping structure) with the nut member 11 on the fastening wall portion 8 (see FIG. 3).
In addition, although illustration is abbreviate | omitted, interposed members, such as a washer and a washer, are interposed between the head of the volt | bolt 12 and the fastening wall part 8, and strengthen the bolt 12 and the fastening strength. I am doing so. Further, the nut member 11 is not limited to a vertically long flat plate shape, but is arbitrary such that the plan view is curved in a substantially arc shape along the inner surface of the support column 2.

As shown in FIG. 1, the opening upper edge of the road wall side wall 7 a and the opposite side wall 7 b of the hole wall 7 having a height difference as described above has an opening upper edge of a substantially reverse shape in a side view. It is connected by the side wall part.
That is, when the vehicle S collides with the protective fence 3, the load resistance strength against the load applied to the opposite side wall portion 7 b by the collision energy applied to the support column 2 through the lateral beams 4 and 5 is effectively maintained, and the load is based on the load. The opening upper end edge of the roadway side wall part 7a and the opposite side wall part 7b is continuously provided so as to be effectively transmitted to the metal fitting 1.
Further, the upper edge of the opening of the hole wall portion 7 between the roadway side wall portion 7a and the opposite side wall portion 7b may be connected in a slanting straight line. The reason is that it is effective to save the material cost of the base metal fitting 1 by removing the portion that is not effective for the transmission of the load to the base portion 1b when the vehicle S collides.

≪Description of base part≫
The base portion 1b is integrally formed on both sides of the hole wall portion 7 of the column standing hole 1a. That is, it is integrally provided on both sides of the hole wall portion 7 located in the direction of the roadway R indicated by the arrow Z in FIG. 2, and does not protrude from the roadway side wall portion 7a to the roadway R side.
Further, as shown in FIG. 1, a bolt insertion hole 13 for fastening with the ground cover T is opened in the base portion 1 b, and the anchor bolt 6 planted (embedded) in the ground cover T is long. The base portion 1b can be fixed to the upper surface of the ground cover T by attaching a bolt 15 via a cylindrical member (pipe-like) nut member 14 (see FIG. 3). Further, the anchor bolt 6 is not positioned on the roadway R more than the roadway side wall portion 7a.
Thus, when the vehicle S collides, the vehicle S collides with the horizontal beams 4 and 5 without directly colliding with the base metal fitting 1, the bolt 6 and the nut 15 for fixing the base metal 1, and the horizontal beams 4 and 5. The collision energy is appropriately absorbed by being guided along.

According to the base metal fitting 1 according to the present embodiment configured as described above, the hole wall portion 7 of the column erecting hole 1a located on the roadway R side in a state of being fixed (installed) on the upper surface of the ground cover T. The height L1 of the roadway side wall 7a from the ground cover T is set to be lower than the vehicle height L of the vehicle S traveling on the roadway R, as shown in FIG. When a vehicle body part such as a bumper collides with the protective fence 3, it does not directly collide with the base metal fitting 1. That is, collision damage to the vehicle S can be reduced by the vehicle S colliding with the upper and lower horizontal beams 4 and 5 of the protective fence 3 without directly colliding with the base metal fitting 1 that does not absorb collision energy.
And about the opposite side wall part 7b located on the opposite side to the roadway side wall part 7a, the lower end side of the support | pillar 2 is firmly coupled and held by the large area (pressure receiving area) and the fastening force of several vertical bolts 9. By using the fastening wall portion 8 having a height L2 and a wall thickness that can be held, the support column 2 is firmly set up and held in a rigid state, and when the vehicle S collides, the support column 2 is required to be broken or collapsed. It is possible to maintain the load bearing strength against.

As shown in FIGS. 2 and 3, the base portion 1b fixed by the anchor bolt 6 is present on the side of the roadway R with respect to the roadway side wall 7a when fixed (installed) on the upper surface of the ground cover T. In this case, even if the tire of the vehicle S rides on the ground cover T, the tire will not be damaged. That is, as shown in FIG. 4, there are no projections such as nuts and bolts on the roadway R side on the upper surface of the ground cover T that may damage the tire when the tire rides on the ground cover T. This can prevent the tire from being damaged.
Further, the upper end edge shape of the column erecting hole 1a has a shape in which the side view is substantially opposite from the roadway R side to the opposite side, or an inclined line shape that is continuously provided in a downward arc shape or an upward arc shape. Alternatively, the curved shape allows the load applied to the opposite side wall portion 7b of the hole wall portion 7 through the support column 2 when the vehicle S collides with sufficient strength and effectively applies the load to the base portion 1b. I can tell you. Moreover, the effect of improving the external appearance (landscape) of the support | pillar 2 base can also be expected.

The specific configuration of the embodiment of the present invention is not limited to the above-described embodiment, and there is a change in the design within the scope of the invention described in claims 1 to 4 without departing from the gist of the present invention. However, it is included in the present invention.
For example, the outer shape (horizontal cross-sectional shape) of the column 2 is circular or square, and the column 2 is arbitrarily fitted into the column standing hole 1a of the base metal fitting 1 that is also formed in a circle or square. . Further, the base portion 1b is not limited to the two directions on both sides of the hole wall portion 7, but is arbitrarily provided in three directions including the opposite side wall portion 7b.

It is a perspective view which shows the base metal fitting of the protection fence support | pillar which concerns on this invention. It is a perspective view which shows an example of the state which installed the protection fence in the ground cover etc. beside a roadway using the base metal fitting. It is a longitudinal cross-sectional view which expands and shows the installation state. It is a cross-sectional view which expands and shows the installation state. It is a longitudinal cross-sectional view which shows the installation state of the protection fence by the conventional base metal fitting.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base metal fitting 1a Prop standing hole 1b Base part 2 Support | pillar 3 Guard fence 4 Upper horizontal beam 5 Lower horizontal beam 6 Anchor bolt 7 Hole wall part 7a Roadway side wall part 7b Opposite side wall part 8 Fastening wall part 13 Bolt insertion hole T Ground cover R Roadway S vehicle

Claims (4)

A base metal fitting used to stand a support fence post installed on the ground cover along the roadway on the ground cover,
A column erect hole in which the lower end side of the column is fitted by internal fitting, and a base portion fixed to the upper surface of the ground cover,
In a state where it is fixed to the upper surface of the ground cover, it is located on the opposite side to the roadway side than the height from the ground cover of the roadway side wall part located on the roadway side of the hole wall part of the pillar standing hole. A base metal fitting for a protective fence post, wherein the height of the opposite side wall portion from the ground cover is formed high, and the opposite side wall portion is used as a fastening wall portion with the post.   In the state of being fixed to the upper surface of the ground cover, the height of the side wall portion of the roadway from the ground cover is the sum of the height of the ground cover from the roadway and the vehicle height of the vehicle traveling on the roadway The base metal fitting for a guard fence according to claim 1, wherein the base metal fitting is designed to be low.   The base portion is integrally formed on a side of a hole wall portion of the pillar standing hole, and a bolt insertion hole for fastening with the ground cover is opened. The base metal fitting of the support fence post according to claim 2.   The base metal fitting according to any one of claims 1 to 3, wherein the base metal fitting is formed integrally with a casting material.

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