JP3507974B2 - Support fence post - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a protective fence installed along a boundary between a roadway and a sidewalk, and includes the impact force at the time of collision of a vehicle including the plastic deformation (elastic-plastic deformation) of the support column. ) And the plastic fence energy (including elasto-plastic energy) associated with it, for the safety fence of the occupant for safety of the occupant.

[0002]

2. Description of the Related Art Conventionally, for protective fences for roads, bridges, etc., measures to absorb the energy when a vehicle collides as much as possible and suppress the damage of the accident as much as possible to improve the safety of passengers etc. Has been done in various ways. For example, the following has been proposed as a guard fence support used for a guardrail. Japanese Utility Model Publication No. 50-30183 discloses a structure in which one stiffener for stiffening is provided on the back side of the base of a support for a protective fence in a direction perpendicular to the beam. Japanese Utility Model Publication No. 3-2013 and Japanese Utility Model Publication 5-2654
The publication discloses a configuration in which a total of four stiffeners for stiffening are provided at the base of the support for the protective fence in a front-back and left-right orthogonal arrangement. JP-B-42-6707 discloses a structure in which the lower end portion of a support for a protective fence is surrounded and supported by elastic pieces of a supporting device embedded in a concrete foundation. In Japanese Examined Patent Publication No. 4-7218, a prop for a protective fence is configured by a combination of a lower fixed shaft portion and an upper slide shaft portion, and the slide shaft portion slides upward when a vehicle collides. A structure is disclosed in which energy is absorbed by the vehicle and an accident in which the vehicle gets over the protective fence and falls is prevented.

[0003]

[Problems to be Solved by the Present Invention]

I) In the above and the above-mentioned protective fence support, since the base of the support is stiffened by the stiffener, as shown in the load-displacement diagram in FIG. 6, according to the initial stiffness of the stiffener,
If the impact force of a car collision is small, it will bounce off the car, which may cause a secondary disaster. On the other hand, if the impact strength exceeds the permissible level, the strut material will break at a position near the upper end of the stiffener as soon as it reaches the limit strength, and there is a danger that the protective effect will be lost at once. II) The above-mentioned props for the protective fence have a structure that absorbs the impact force at the time of a car collision as the elastic energy of the elastic pieces in the supporting device, so at first glance it seems reasonable, but in reality how large the impact is. There is a difficulty in designing and manufacturing elastic pieces and the like regarding whether to exert a protective effect against force. The effect is poor if the elastic piece is too soft or too hard. Further, since the support device for the support column has a complicated structure, there are problems in terms of workability and cost. III) The above-mentioned protective fence column has a structure in which the upper slide shaft part slides upward to absorb the impact energy due to a car collision, but it will be installed in a place with a limited shape, and it will be permanently installed. There is a question about the protection of the protective effect due to the occurrence of rust etc.

Therefore, the object of the present invention is to provide a good energy absorbing function on average even if a large or small impact force due to a collision of a vehicle is received, and the collision vehicle is repelled, or conversely, the strut itself is There is no need to worry that the protective effect will be destroyed and lose the protective effect. Moreover, it is to provide a protection fence post that is excellent in workability, low cost, practicality and versatility.

[0005]

As a means for solving the above-mentioned problems, in the protection fence post according to the invention described in claim 1, the impact force due to the collision of the vehicle is regarded as the plastic energy due to the plastic deformation of the post. A protective fence post that absorbs,
A center stiffener 6 which is vertically fixed in a direction parallel to a fence material 9 such as a beam, a pipe or a wire cable is provided on the upper surface of a base plate 2 which is fixed on a concrete base 1 on the ground, and a cylindrical support member 7 is provided. notch 8 of the height H and thickness corresponding width T of the center stiffener 6 vertically upward is provided from its lower end, cutout portion 8 is fitted in front <br/> Symbol Center stiffener 6, the cut The contact edge between the portion 8 and the center stiffener 6 is joined by welding , and the lower end of the support member 7 and the base plate 2 are welded.
It is characterized by not being. Invention according to claim 2
Is a pillar material in the pillar for protection fence according to claim 1.
Make sure that the bottom edge of 7 is in close contact with the base plate 2
Are characterized by a slight separation.

[0006]

Embodiments and Examples of the Invention Next, the embodiments and examples of the present invention shown in the drawings will be described. The protective fence post of the present invention constitutes a so-called protective fence such as a guard rail, a guard pipe or a guard cable by supporting a fence material such as a beam, a pipe or a wire cable, and plastically deforms the impact force due to a collision of a vehicle. It is preferably implemented as one that is absorbed as plastic energy associated with.

[0007] The embodiment of the protection fence column shown in Figs. 1 to 3 is a so-called guard rail among beam-type protection fences using a beam as a fence material. A center stiffener 6 fixed vertically in a direction parallel to the beam 9 is provided on the upper surface of a base plate 2 which is firmly fixed on the concrete base 1 on the ground, and a cylindrical support member 7 is vertically attached from its lower end. shape similar to the height H and the thickness T of the center stiffener 6 in upward direction (see FIG. 2A) the size of the notch 8 is provided, cutout portion 8 before <br/> Symbol Center stiffener 6 The contact edge between the notch 8 and the center stiffener 6 is firmly joined by continuous fillet welding (see FIG. 2B). Support material 7
The lower end of the base plate 2 and the base plate 2 are not welded at all. The lower end of the strut member 7, in addition to the case of flush against the base plate 2 as shown in FIGS. 2B and 3, the 塑 deformation of the center stiffener 6 as substantially good if occupied design method, the base plate of the lower end of the struts 7 It is also possible to implement the structure separated from the upper surface of 2 by several mm to several tens mm.

As a means for vertically fixing the center stiffener 6 to the upper surface of the base plate 2 in a direction parallel to the beam 9, continuous fillet welding is used as shown in FIG. Center stiffener 6 and base plate 2
In order to avoid the welding bead with the chamfer, a chamfered portion 12 in the 45 ° direction is formed at the lower end portion of the notch portion 8 of the strut member 7. As shown in FIG. 3, this guardrail column has bolt holes 3 provided at four corners of a base plate 2, and anchor bolts 4 prepared by being embedded in a concrete base 1 in advance are passed through the bolt holes 3 to be attached to the anchor bolts 4. The double nut 5 is fixedly installed by screwing in and tightening strongly.

A bolt hole 13 provided in the upper portion of the support member 7
The beam 9 is attached by using to complete the guardrail. The beam 9 is a bolt 10 that is passed through the bolt hole 13.
And the mounting seat 14, and the nut 11 is tightened to be firmly fixed. The beam 9 may be attached in only one step as shown in FIG. 3, or may be attached in a plurality of steps in parallel vertically as needed.

The column member 7 of this embodiment has a height of 700 mm when the beam 9 is attached in one step and a height of 900 mm when it is attached in two steps. A cylindrical steel material having an outer diameter of 140 mm and a wall thickness of about 4.5 mm is used. The base plate 2 is a steel plate having a thickness of 280 mm × 280 mm and a thickness of about 19 mm. The center stiffener 6 is a processed product of a steel plate having a height H of 150 mm and a thickness T of about 19 mm.

FIG. 4 shows a deformed state of the guardrail support column of this embodiment when it receives an impact force F due to a vehicle collision. As it can be seen from FIG. 4, center stiffener 6 struts 7 caused a 塑 sexual bending deformation in accordance with the magnitude of the impact force is inclined. Center stiffener 6 at this time
The lower end of the strut material on the rear side collides with the base plate 2, and the front side is simply open. Eventually, the center stiffener 6 is bent and deformed in the form of simple bending of the fixed end. Therefore, as shown in FIG. 5, when the initial stiffness of the center stiffener 6 reaches the yield limit, the plastic stiffener exerts a large plastic energy absorption capability as the bending deformation progresses thereafter, and the vehicle may be damaged due to accidents or injured. Exerts the effect of reduction. The initial rigidity of the guardrail prop of the present embodiment is determined by properly designing the plate thickness T and height H and width of the center stiffener 6 and the size of the gap between the lower end of the post member 7 and the base plate 2. Can be adjusted. If the gap is not provided or the gap is small, the initial rigidity becomes large, and if the gap is made large, the initial rigidity becomes small as the rigidity of the center stiffener 6 itself. This is not limited to the guard rail support of this embodiment, but can be applied to other types of protection fences (guard pipe type, guard cable type, etc.).

Therefore, the rigidity of the prop for the protective fence of the present invention is adjusted with reference to the plate thickness T, height (length) H and width of the center stiffener 6, and the gap between the lower end of the prop 7 and the base plate 2. The size can be adjusted and set.

[0013]

According to fences upright according to the present invention The present invention effects achieved by the ## from absorbing the impact force by vehicle crash as bending accompanied cormorants塑 energy to the center stiffener plate thickness T and the height of the center stiffener H and width, and support 7
By properly designing the gap between the lower end of the base plate 2 and the base plate 2, even if a large or small impact force due to a collision of a vehicle is received, the energy absorbing function is excellently performed on average, and the collision vehicle is repelled, On the contrary, it can be implemented so that the prop itself is not destroyed and the protective effect is not lost, the safety of the occupants can be increased as much as possible, and it also contributes to the prevention of secondary accidents.

Further, since the initial rigidity can be adjusted, it is possible to easily carry out the design method according to the expected accident situation. As for the materials used and the processing thereof, the cost is low and the workability and versatility are excellent as compared with those conventionally used.

[Brief description of drawings]

FIG. 1 is a perspective view of a protective fence post according to the present invention.

FIG. 2A is a side view before joining the center stiffener and the notch of the support member, and FIG. 2B is a side view after joining.

FIG. 3 is a side view showing an embodiment of a prop for a protective fence (guard rail) according to the present invention.

FIG. 4 is a perspective view showing a deformed state when a large impact force due to a strong collision is applied to the protection fence (guard rail) column according to the present invention.

FIG. 5 is a load-displacement diagram of a support for a guard fence according to the present invention.

FIG. 6 is a load-displacement diagram of a conventional prop for a guard fence.

[Explanation of symbols]

1 concrete base 2 base plate 9 beams 6 Center stiffener 7 Support material H Center stiffener height Width equivalent to the plate thickness of the T center stiffener 8 notches

─────────────────────────────────────────────────── ─── Continuation of the front page (73) Patent holder 000003528 Tokyo Rope Co., Ltd. 2-33-1 Nihombashi Muromachi, Chuo-ku, Tokyo (73) Patent holder 000231110 JFE Construction Materials Co., Ltd. Kitahonmachi, Chuo-ku, Kobe-shi, Hyogo 1-28-12 (72) Inventor Satoshi Kaji 3-10-16 Higashimonmae, Kawasaki-ku, Kawasaki-shi, Kanagawa (72) Masahiro Yasuda 3-8-4-103 (72) Utajima, Nishiyodogawa-ku, Osaka-shi, Osaka ) Inventor Tetsuya Endo 1-26 Motohamacho, Amagasaki City, Hyogo Prefecture (72) Inventor Masushi Kono 2-15-23-201 Takatsugu, Mita City, Hyogo Prefecture (72) Hirotoshi Mihara Nihonbashi Muromachi, Chuo-ku, Tokyo 2 3-1 (72) Inventor Noriyuki Horikawa 2-9-3 Nakatsuma, Ageo City, Saitama Prefecture (56) References Kaikaihei 3-18216 (JP, U) Sanaihei 3-2013 (JP, U) Actual Kaihei 1-75117 (JP, U) Actually open 47-2 7434 (JP, U) Actually open 61-76811 (JP, U) Special public 42-6707 (JP, B1) Actual public 5-2654 (JP, Y2) Actual public 4-7218 (JP, Y2) Jikken 50-30183 (JP, Y1) (58) Fields investigated (Int.Cl. ⁷ , DB name) E01F 15/00-15/06

Claims (2)

(57) [Claims] 1. A prop for a protective fence that absorbs an impact force caused by a collision of a car as plastic energy associated with plastic deformation of the prop, and a beam, a pipe or a wire cable is provided on an upper surface of a base plate fixed on a concrete foundation of the ground. Center stiffeners fixed vertically in a direction parallel to the fence material, etc. are provided, and the cylindrical strut material is provided with a notch having a height equivalent to the center stiffener and a width equivalent to the plate thickness vertically upward from the lower end thereof. The notch is the center stiffener
Fitted into the contact edge portion of the notch and the center stiffener is welded, the lower end of the strut member and base
A prop for a protective fence, which is not welded to a splate. 2. The lower end of the column member is fitted to the base plate.
A contract, characterized by being in contact or slightly separated
The support fence support described in claim 1.