JPH02236306A - Column for protection fencing - Google Patents

Abstract

PURPOSE:To decrease impact to passengers by providing two steps on the attaching face of a standing column, grounding its road side half on a road face, cutting out its outer half with a clearance providing and attaching respective halves by anchor bolts and nuts through spacers. CONSTITUTION:Each of spacers 7a, 7b is formed in a two-step pipe shape. The major diameter of the lower step is slightly smaller than the minor diameter of the upper step. On the bottom face of a column main body 1, an inner half 3 is made to come into contact with a road surface, an outer side 4 is cut out to form a space and they are respectively fixed by means of anchor bolts 6, 6' through spacers 7a, 7b. When impact is applied to the column main body 1, compression acts on the respective spacers 7a, 7b, the joint part between the upper and lower step pipes is broken, the upper step part bites the lower step part to absorb impact force and they do not move with the fixed quantities of deformation. Thus, since the quantities of deformation can be limited, safety can be improved.

Description

[Detailed Description of the Invention] The present invention is a fence post that protects vehicles from deviating from the road due to an accident. This is to prevent permanent deformation and to limit the deformation to a certain amount to ensure stability. Furthermore, in the present invention, the main body of the column is made of a rigid structure, and the supporting structure using anchor bolts is inventive, and a separate member that undergoes permanent deformation is combined with this structure. A conventional technique that has the same purpose as the present invention is to plastically deform the column itself under a set load (plastic design, not rigid design), and in this case, if the set load is estimated to be small, the fracture will proceed as it is. This has the disadvantage that the amount of deformation exceeds the set value. Next, the present invention will be explained with reference to the drawings.
2. 2' is the cross beam; 3 is the mounting surface that contacts the road surface; 4 is the mounting surface that forms a step and has a gap between it and the road surface; 5. 5' is a through hole, 6.6' is an anchor bolt, 7a. 7b is a spacer detailed in FIG. 5, 8 is a nut, and spacer 7a. 7b has a two-stage pipe shape, and has an anchor bolt insertion hole 9 and an upper outer diameter part 10.
A lower inner diameter portion 11 with a slightly smaller diameter than that of the shear expected portion 12
It consists of FIG. 4 shows an example of a conventional system, in which the support main body 13 has a recess 14 in order to limit plastic deformation. Note that 15 is the road surface. Next, the effects of the present invention will be explained. No. 1 has stepped portions 3, 4 as shown in FIG. According to the configuration shown in FIG. b without this, when a load P is applied to the cross beam 2, the center point of the moment of deformation is point B, and the amount of displacement at the position of the anchor bolt 6 is d2. On the other hand, according to the configuration of the present invention shown in FIG. Therefore, the amount of displacement d·l at the position of the anchor bolt 6' can be made equal to dl. Next, to explain the functions of spacers 78 and 7b in Fig. 3, the load F
When this occurs, the expected shearing part 12 causes shearing failure at the set value, and then the upper part bites into the lower part and the upper outer diameter part 1
0 is slightly larger than the lower inner diameter part 11, so it cannot be expanded.
), and remains immobile at the height dl. In the conventional method, plastic deformation occurs in the hollow part 14 as shown in FIG. As described above, when the present invention receives a large impact force P, the energy is transferred to the spacer 7.
This is absorbed by the destruction of spacers 7a and 7b, and in order to suppress the amount of deformation caused by the destruction of spacers 7a and 7b to a relatively small amount, and to limit the amount of deformation, the axis of displacement δ of the entire column is set. This makes it possible to guarantee safety, which is the original function of a protective fence.Moreover, the support main body 1 has a rigid design and is easy to construct, so it has high technical value.

[Brief explanation of drawings]

Fig. 1 is an overall perspective view in which the present invention can be implemented, Fig. 2 is a partial cross-sectional side view of the main parts thereof, Fig. 3 a and b is a schematic side view illustrating the operation of the present invention, and Fig. 4 is a side view of a conventional configuration. Schematic diagram, Figure 5a
b shows a side sectional view of the component embodiment. 1. 2.2' 3.4 5.5'6.6' 7a 7b Side of the pillar body Beam mounting surface through hole Anchor bolt spacer Pillar body! Enge? for! 4-1 Possible 5 Country Kugo L) (b)

Claims (1)

[Claims] It has a rigid structure that supports horizontal beams, and the mounting surface of the vertical pillar supported by anchor bolts is stepped, and when the road side half is in contact with the road surface, the outer half is in contact with the road surface. A notch is formed to have a gap, and each of the stepped mounting surfaces has a through hole through which an anchor bolt is inserted. It is attached with a nut via a spacer that breaks due to compressive force and reduces its height, and the anchor bolt in the outer notch is inserted into the notch with a spacer having the same structure as above, and is attached from above with a nut. A protective fence post featuring: