JP2012202184A - Guard fence - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a guard fence capable of reducing the damage to a column as much as possible by suppressing transmission of shock to the column even when a large shock is applied to a horizontal rail.SOLUTION: Because a column 1 is steel and a horizontal rail 2 is aluminum alloy, and the horizontal rail 2 of aluminum alloy has a lower strength compared with a steel horizontal rail with high strength, the horizontal rail 2 bends to absorb shock so that the transmission of shock to the column 1 can be suppressed. In addition, compared with a column of aluminum alloy, the steel column 1 can reduce the force which works in a direction of withdrawing an anchor bolt A when shock is received, so that a burden on a foundation part which is a concrete covered ground part R can be reduced.

Description

  The present invention relates to a protective fence in which a horizontal rail is attached to a column provided on a ground covering portion on a side edge of a road.

  In general, on roads in bridges and mountainous areas, a protective fence is provided to prevent a passing vehicle from falling outside the road beyond the side edge of the road. These protective fences are generally mounted on a concrete ground cover provided on the side edge of the road. The protective fence is provided to prevent the vehicle from jumping off the road. However, when the vehicle collides with the protective fence, the damage to the vehicle or the protective fence is large.

  For example, in Patent Document 1, a base fixed by an anchor bolt disposed on a ground cover standing along a roadway, a support portion of a cross beam formed integrally on the base and on the roadway side. The anchor bolt through-holes are symmetrical on both sides of the lower end of the web. And a guard post for a roadway located outside the left and right tip portions of the lower end of the flange.

  Further, in Patent Document 2, a bottom plate is provided at the lower end of a support column having a substantially H-shaped cross section composed of a front flange, a rear flange, and a middle wall, and the bottom plate has anchor bolts symmetrically on both sides of the middle plate. A roadway guard fence post provided with a set hole has been proposed.

JP 2001-234515 A Japanese Unexamined Patent Publication No. 55-101607

  Generally, as shown in Patent Documents 1 and 2, the guard fence has insertion holes formed in the front, rear, left and right sides of the base of the support column, and anchor bolts protruding on the ground cover portion are inserted into the insertion holes. In addition, a horizontal beam is passed between the columns, and both the column and the horizontal beam are made of steel, so when a vehicle or the like collides with the horizontal beam of the protective fence, due to the material characteristics of steel, There is a concern that the impact will be greatly applied to the strut and the strut will also bend and break, and once the strut is damaged, it may be repaired, such as dug up the foundation part of the ground cover and reconstructing the new strut Was a tough job.

  The present invention eliminates the above-described problems and provides a protective fence that can suppress the propagation of the impact to the support column and minimize the damage to the support column even when a large impact is applied to the crosspiece. Is.

In order to achieve the above object, the present invention is configured as follows.
That is, the protective fence according to the present invention is a protective fence in which a horizontal beam is attached between columns that are erected on the ground covering portion of the road side edge, the column is made of steel, and the horizontal beam is It is made of an aluminum alloy.

  According to the present invention, since the support is made of steel and the horizontal beam is made of aluminum alloy, the horizontal beam made of aluminum alloy is lower in strength than the high-strength steel horizontal beam. Bending can absorb the impact and suppress the propagation of the impact to the support column. In addition, it is possible to reduce the force acting in the direction of pulling out anchor bolts when subjected to an impact, by using steel posts as compared to aluminum alloy posts, and thus a foundation that is a concrete ground cover. The load on the part can be reduced.

It is a front view which shows embodiment of the protection fence concerning this invention. It is a side view showing an embodiment of a protection fence concerning the present invention. It is a rear view which shows embodiment of the protection fence concerning this invention.

Next, the best mode for carrying out the present invention will be specifically described with reference to the drawings.
Reference numeral 1 denotes a steel column erected on the ground cover R on the side edge of the road, 2 denotes an aluminum alloy horizontal rail mounted between the columns 1, and the protective fence P according to the present invention includes the column 1, A horizontal bar 2 is provided, and the column 1 is fixed to a concrete ground cover R via an anchor bolt A. In the protective fence P and its constituent members, the road side is the front or the front, and the opposite side is the rear or the rear.

  The support column 1 includes a support column main body 3 to which the cross rail 2 is attached and a base portion 4 to which the lower end of the support column main body 3 is fixed. Both the support column main body 3 and the base portion 4 are made of steel.

  The horizontal beam 2 is constructed in three stages between the columns 1 and is made of an aluminum alloy so as to absorb the impact when the vehicle collides, and not easily break and suppress the propagation of the impact to the column 1. A product obtained by appropriately cutting a circular tube made into a suitable length is used. In the present embodiment, the horizontal rails 2 are connected to each other in the horizontal direction via the bolts B and a cylindrical sleeve 21 inserted into the horizontal rail 2 at the position of the column 1. In addition, the cross-sectional shape of the horizontal rail 2 may be a rectangular shape or an elliptical shape, and may be coated to improve the corrosion resistance.

  In this embodiment, the column main body 3 has a substantially H-shaped cross section, and connects the front flange portion 31, the rear flange portion 32, the front flange portion 31, and the rear flange portion 32 that face each other in the front-rear direction. It is comprised from the connection board part 33, and is integrated by welding. On the front surface of the front flange portion 31, there is provided a support portion 31a formed to be recessed rearward, and each cross rail 2 is in contact with the support portion 31a and attached via a fixing bolt B. The rear flange portion 32 has a shorter width in the left-right direction than the front flange portion 31 and is bent in the direction in which the road extends by twisting against the impact of the vehicle or the like. 1 is also somewhat absorbed. In addition, although the cross section using H steel etc. is substantially H-shaped, the support | pillar main body 3 of the said form may be pipe-shaped forms, such as circular shape and a rectangular shape.

  The column main body 3 has the necessary strength to prevent it from being easily broken by an impact when the vehicle collides with the aluminum alloy crosspiece 2 and can reduce the force acting in the direction of pulling out the anchor bolt A. In order to improve the corrosion resistance, it is preferable to use a steel plate that has been processed into a suitable shape as described above so that the load on the concrete cover portion R can be reduced. Zinc plating or painting may be applied. Further, the column main body 3 may be made of cast iron or stainless steel.

  In the present embodiment, two anchor bolts A are provided in front of the front flange portion 31, and the connecting plate portion 33 is sandwiched between the front flange portion 31 and the rear flange portion 32, so that the anchor bolt A is more than the front anchor bolt A. Although two anchor bolts A having a short length are arranged, the present invention is not particularly limited to this, and two anchor bolts A are sandwiched between the front flange portion 31 and the rear flange portion 32, and two each of them. It may be arranged, or two may be arranged behind the rear flange part 32 with two connecting plate parts 33 sandwiched between the front flange part 31 and the rear flange part 32, or the front flange part Two may be disposed in front of 31 and two behind the rear flange portion 32, and may be disposed on the side of the front flange portion 31 or the rear flange portion 32.

1 Prop 2 Horizontal rail 3 Prop body 4 Base part A Anchor bolt R Ground cover P Guard fence

Claims (1)

  It is a protective fence in which a horizontal beam is attached between columns that are erected on the ground covering portion of the road side edge, the column is made of steel, and the horizontal beam is made of aluminum alloy. Features a protective fence.

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