JP4074797B2 - Timber beam mounting structure on wooden guard fence - Google Patents

Description

表１に示すように、重ねての実測を行った結果、車両のカバー部材への、のめり込み現象は見られず、本発明の実施によって木材ビーム特有の緩衝機能を十分に発揮させることができ、衝突時に車両５に与える加速度を勢い低下させることができた。
【００２３】
筒状カバー部材１１に対する木材ビームの中間断面の突出は、ほとんど問題とならない。車両ホイールが掛かるとも、木材ビームの素材は脆く、押し潰されるか端縁がちぎられ、削り取られるからである。木材ビームの突出量としては、５〜１０ｍｍ位までは十分に許容できる。しかし、これ以上になると、木目に沿っての、のめり込みを想定し得る。この可能性から、左側通行の場合、木材ビーム１０の末口側から元口側へかけての方向を車両進行方向と一致させておくのが好ましい。図１の例では、木材ビーム１０の配置において、末口側を左側とすれば良い。このようにすれば、図２の寸法関係において、木材ビーム１０の筒状カバー部材１１に対する突出点１８の量を最適値に保つことができる。
【００２４】
図４は、筒状カバー部材をブラケットと１体化し、かつ前後部分割構造とした例を示す斜視図である。図示のように、本例のブラケット１体型の分割式筒状カバー部材１９は、後部部材２０の道路内側面を木材ビームの径に合わせた円弧面に形成している。また、前部部材２１の支柱側面を円弧面とし、前部部材２１の上下フランジ部を後部部材の上下端面に嵌合することにより、両者１体化されて両部材間に形成される内孔部分に図２で示した木材ビーム１０の端部を嵌装可能となっている。
【００２５】
後部部材２０及び前部部材２１の夫々には、両者を相互に結合するためのボルト挿通用の穴２２、２３が明けられている。
【００２６】
後部部材２０及び前部部材２１を組み合わせることにより、筒状のカバー部材を構成できるので、木材ビーム１０の組付け作業が容易である。また、木材ビームの交換作業を容易に実施できる。
【００２７】
図５は、図３に示した筒状カバー部材１１に設計変更を加えた例を示す。本例の筒状カバー部材２４は、筒状部分の中間に開口部２５を設けている。このように、筒状カバー部材における筒状部分は、完全な筒形で無くとも良く、種々変形できる。左右筒径が異なるのも構わない。
【００２８】
図６は、木材ビームが角形である場合の適用例を示す斜視図である。本例では、木材ビーム２６が四角であり、筒状カバー部材２７の内孔形状も四角とされる他前例と変わる所が無い。木材ビーム２６の端部の切削は、４面共に切削した例で示しているが、本発明の要件としては、前面のみで事足りる。
【００２９】
図７は、本発明を適用できる木材ビームの各称断面形状を示す説明図である。（ａ）図は、丸太の前面のみを削った木材ビーム２７を示す。（ｂ）図は、丸太の両面を削って作った太鼓形の木材ビーム２８を示す。（ｃ）図は上下に長い長方形の木材ビーム２９を示す。（ｄ）図は、上下に配置した一対の丸太３０を接続板３１で連結した組合せ形の木材ビーム３２の例を示す。いずれの場合にも、これらの形状に合わせて作った筒状カバー部材との関係において、筒状カバー部材の厚みｄより大きな寸法ｄ１の切削を行うことにより、カバー部材の前面が中間断面より突出することの無い構造とすることができる。
【００３０】
本発明は、以上示した実施の形態に限定されるものではなく、本発明の要旨を逸脱することの無い範囲で適宜設計的変更を行うことができ、各種態様で実施し得ること勿論である。
【００３１】
【発明の効果】
以上示した通り、本発明は、道路路側に沿って立設した複数の支柱の内側にビーム支持用のブラケットを設け、相隣り合う支柱側から夫々延伸された木材ビームの端部を相互に突き合わせた形で前記支柱に対し支持すると共に、カバー部材を用いて両木材ビームの支柱付近の端部を覆って成る木製防護柵における木材ビーム取付構造において、前記カバー部材を、その開口方向が前記木材ビームの延伸方向と一致する筒状部材で構成し、前記木材ビームの両端部を、前記筒状部材の厚みより大きな量で、かつ前記筒状部材の内孔に嵌装可能となる寸法まで切削し、前記カバー部材の道路内側面が前記木材ビームの中間断面から外方に突出しない構造としたことを特徴とする木製防護柵における木材ビーム取付構造である。
【００３２】
従って、車両が木材ビームに衝突し、木材ビームに力を与えつつ支柱方向に誘導されてきた場合、タイヤホイールの円滑な誘導条件を整えることができ、車両ホイールがカバー部材にのめり込む恐れが一切無くなり、車両、特に小型車両に過大な加速度を与えることが無く、極めて高い安全性を確保できる。また、その結果、支柱に過大な力を加えることも無いので、支柱を無関に高強度に設計する必要も無く、コンパクトな設計が可能となる。
【００３３】
丸太の両端部を同一径に切削し、その切削部分の夫々に、前記筒状部材に備えた固定用穴に合わせて、上下貫通孔を設けた木材ビームを用いれば、簡易な木材ビームの規準品を製作可能であり、高性能で安全性の高い衝突対応型の木製防護柵を、高景観、低コストで実現できる。
【図面の簡単な説明】
【図１】本発明を実施した木製防護柵の一例を示す斜視図である。
【図２】図１に示した木製防護柵に用いる丸太製木材ビームの平面図である。
【図３】図１に示した木製防護柵の木材ビーム取付構造の詳細を示す斜視説明図である。
【図４】木製防護柵における木材ビーム取付構造の他の実施形態を示す斜視図である。
【図５】木製防護柵における木材ビーム取付構造のさらに他の実施形態を示す斜視図である。
【図６】木製防護柵における木材ビーム取付構造を四角の木材ビームに適用した例を示す斜視図である。
【図７】本発明を適用できる他の木材ビームの形状例を示す端面図である。
【図８】従来の木製防護柵における木材ビームの取付構造を示す平面図である。
【符号の説明】
１ 支柱
５ 車両
６ 車両の誘導方向
７ 木製防護柵
８ 道路路側
９ ブラケット
１０、２６ 木材ビーム
１１ 筒状カバー部材
１２ 貫通孔
１３、１６、２２、２３ 穴
１４、１７ ボルト
１５ ナット
１８ 木材ビームの突出点
１９ ブラケット１体型の分割式筒状カバー部材
２０ 後部部材
２１ 前部部材
２５ 開口部
Ｄ 木材ビームの切断断面直径
Ｄ１ 木材ビームの末口断面直径
Ｄ２ 木材ビームの元口断面直径
ｄ 筒状カバー部材の厚み
ｄ１ 末口切削量[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wood beam mounting structure in a wooden guard fence using a buffer material as a wood beam.
[0002]
[Prior art]
In recent years, wooden guard fences using a buffer material as a wood beam have been developed and put into practical use. Unlike wood cushioning materials such as metal steel plates, wood beams have landscape and cushioning properties unique to wood and are highly evaluated. However, since natural logs such as thinned wood are mainly used as wood beams, the buffer function at the time of vehicle collision is different and appropriate measures are required. For this reason, the present inventors have made various improvements while repeating numerous collision experiments.
[0003]
For example, in Japanese Patent No. 2974949 (guard fence), in order to compensate for the strength of the wood beam, reinforcing bars are attached along the back surface of the wood beam, and the holes of the fixing plates provided at both ends are provided at the ends of the wood beam. Along with the mounting hole opened in the above, the wood beam is fixed to the support column with the nut not protruding from the front surface of the wood beam through the fixing bolt embedded in the concrete support column.
[0004]
Further, for example, in Japanese Patent No. 2958254 (protective fence), a semi-cylindrical presser cover is fitted to both end connecting portions of the cushioning materials, and the presser cover is fixed to the support column with bolts for fixing the cover. . By fitting the presser cover, not only can the landscape be improved, but also the end face processing at the butt position of the wood beam can be performed, and the mutual holding of the beams can be enhanced.
[0005]
However, as a result of repeated research and development by the inventor of the present inventor, it has been found that the presser cover may be obstructed by the collision buffer function under certain conditions. That is, as shown in FIG. 8, a bracket 2 for supporting a beam is provided inside the support column 1, and the ends of the wood beams 3 respectively extended from the adjacent support column sides are supported in a mutually butted manner. When the end near the beam is covered with the cover 4, an excessive acceleration exceeding the reference value may be given particularly to a small vehicle. According to the protection fence installation standard established by the Japan Road Association, the acceleration received by the vehicle is 9 g or less and at most 12 g or less.
[0006]
As a result of the cause investigation, when the front wheel of the vehicle 5 collides with the wood beam 3 of the protective fence, the tubeless tire is instantly punctured by the impact, and the tire wheel directly collides with the wood beam. At the same time, the front wheel of the vehicle 5 is guided to the end face of the cover 4 as shown by the arrow 6 and applies force to the column 1 in a form that it is embedded in a metal cover slightly protruding from the surface of the wood beam 3, and its reaction. It was an extremely excessive shock peak. Incidentally, the thickness of the cover 4 is 3 mm, and it has been confirmed that the same phenomenon occurs even when the cover 4 is in close contact with the wood beam 3. The vehicle wheel is fitted into the cover member. According to experimental values, when a normal passenger car with a mass of 1 ton collided at a speed of 60 km / h and an angle of 60 °, the acceleration applied to the vehicle reached 15 g. This value is too large, and the impact received by the vehicle and the occupant is excessive, which is a serious problem.
[0007]
[Patent Document 1]
Japanese Patent No. 2974949 (first page, FIG. 1)
[Patent Document 2]
Patent No. 2958254 (first page, FIG. 2)
[0008]
[Problems to be solved by the invention]
An object of the present invention is to provide a wood beam mounting structure in a wooden protective fence that does not give an excessive acceleration to the vehicle when the vehicle collides with the wooden protective fence.
[0009]
[Means for Solving the Problems]
The wood beam mounting structure in the wooden guard fence of the present invention that can solve the above problems is provided with beam support brackets on the inside of a plurality of pillars erected along the roadside, respectively, from the adjacent pillar sides. In the wood beam mounting structure in the wooden guard fence, the ends of the extended wood beams are supported against the support in a form of abutting each other, and the ends near the support of both the wood beams are covered using a cover member. ,
The cover member is composed of a cylindrical member whose opening direction coincides with the extending direction of the wood beam,
Cutting both ends of the wood beam to an amount larger than the thickness of the tubular member and to a dimension that allows fitting into the inner hole of the tubular member,
The inside surface of the road of the cover member is structured not to protrude outward from the intermediate cross section of the wood beam.
[0010]
The cross-sectional shape of the cylindrical member and the cross-sectional shape of the end portion of the wood beam fitted thereto can be variously formed such as a perfect circle, an ellipse, and a square. However, from a practical viewpoint such as manufacturing convenience, a perfect circle or a rectangle is preferable. Further, since it is a condition that both ends of the wood beam are larger than the thickness of the tubular member and can be fitted into the inner hole of the tubular member, the cross-sectional shape of the tubular member and the wood beam It is not always necessary to match the cross-sectional shape of the end portion to the same shape. However, it is preferable to make both shapes the same or substantially the same from a practical viewpoint such as manufacturing convenience.
[0011]
In the present invention, it is an absolute condition that the road inner surface of the cover member does not protrude outward from the intermediate cross section of the wood beam. As a result, when the end of the wood beam covered with the cover is viewed as a plane figure, the wood beam may protrude from the cover, but the cover cannot protrude from the wood beam. The front wheel wheel of the collision vehicle invites the end of the cover, crashes into the column, and does not give the vehicle an excessive acceleration exceeding the reference value. The vehicle that has collided with the vicinity of the column slides on the surface of the cover member and is reflected toward the inner side of the road while being guided in the direction of the next wood beam.
[0012]
It is conceivable that the front wheel wheel of the vehicle colliding with the vicinity of the column slides on the surface of the cover member and is locked by a projection of several mm at the end of the next wood beam. However, locking at the end of the wood beam is hardly a problem. This is because the end of natural wood such as cedar is brittle and can be scraped lightly with the front wheel of the vehicle. Thereby, a big acceleration is not added to a vehicle. The projection of the wood beam is acceptable up to about 3 to 10 mm. It is still effective if corner beveling is performed.
[0013]
When the inner hole shape of the cylindrical member is circular and has the same left and right diameters, both ends of the wood beam are cut to the same diameter on the left and right sides so that they can be fitted into the circular inner holes. A wood beam cuts both ends of a log into the same diameter, and provides an upper and lower through-hole in each of the cut portions according to a fixing hole provided in the cylindrical member. Thus, by using the shaped wood beam and the cover member, an inexpensive industrial product can be obtained, and a high-quality wooden guard fence can be installed only by assembling work.
[0014]
The cylindrical member can be divided into a rear member that is also used as the bracket and a front member that is joined from the front side and forms a cylindrical inner hole therebetween. By using the split structure, the assembly work can be easily performed. Since it is divided into front and back instead of up and down, the bolt insertion direction during assembly is inevitably up and down, and the head of the bolt and nut comes out inside the road, which prevents accidents that cause a big impact on the vehicle it can.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below. FIG. 1 is a perspective view of an example of a wooden guard fence embodying the present invention, FIG. 2 is a plan view of a wood beam used therefor, and FIG. 3 is a perspective view showing details of the mounting structure.
[0016]
As shown in the drawing, the wooden guard fence 7 is provided with a beam support bracket 9 inside a plurality of columns 1, 1 erected along the roadside 8, and extends from the adjacent columns 1, 1 side, respectively. The end portions of the timber beam 10 are supported against the support column in a butted manner, and the opening direction of the two timber beams 10 is adjusted using a cylindrical cover member 11 whose opening direction coincides with the extending direction of the timber beam 10. It covers the end near the column.
[0017]
Both ends of the wood beam 10 are cut to an amount larger than the thickness d (for example, 3 mm) of the cylindrical cover member 11 and to a dimension D that can be fitted into the inner hole of the cylindrical cover member 11, The inner surface of the road of the cylindrical cover member 11 has a structure that does not protrude outward from the intermediate cross sections D1 to D2 of the wood beam 10.
[0018]
As shown in detail in FIG. 2, the wood beam 10 has both ends of natural logs cut to a dimension of a diameter D and is inserted into a cylindrical cover member 11, and bolts are inserted into the column 1. A through hole 12 for fixing and supporting is opened. In the case of natural logs, the diameter of the intermediate section is usually larger at the diameter D2 of the original opening and smaller at the diameter D1 of the end opening. When the thickness of the cylindrical cover member 11 is d, the cutting amount at the end is a value d1 greater than this. Thereby, the road inner surface of the cylindrical cover member 11 does not protrude outward from the intermediate cross sections D1 to D2 of the wood beam 10. Specifically, the outer shape of the cut portion should be processed into a cross section that is at least 8 mm, preferably 12 mm to 15 mm smaller than the outer diameter of the cover.
[0019]
The cylindrical cover member 11 is shown as an example of a single unit with the bracket 9. A space portion is formed in the bracket 9, and it is devised to absorb energy at the time of collision and to have a buffer function. A pair of holes 13 are formed on both ends of the cylindrical cover member 11 in the vertical direction. The end of the wood beam 10 is fitted into the inner hole, the through hole 12 and the hole 13 are aligned, a bolt 14 is inserted from above, and a nut 15 is hung from below, thereby covering the wood beam 10 with a cylindrical cover It can be securely fixed to the member 11. There is no concern that the bolt 14 or the nut 15 protrudes to the inner surface of the wood beam 10.
[0020]
The bracket 9 can be firmly fixed to the column 1 by passing a hole 16 formed in the corresponding surface of the column 1 through a bolt 17 inserted from the rear of the column 1 and hooking a nut in the space.
[0021]
In the wooden guard fence 7 configured as described above, even if the vehicle 5 collides in the same manner as shown in FIG. 8, the vehicle 5 is smoothly slipped without being caught in the cylindrical cover member 11. Can be reflected inside the road. Table 1 shows examples together with comparative examples.
[0022]
[Table 1]

As shown in Table 1, as a result of repeated measurements, no sinking phenomenon is seen in the vehicle cover member, and the buffer function peculiar to the wood beam can be sufficiently exerted by carrying out the present invention. The acceleration given to the vehicle 5 at the time of the collision could be reduced.
[0023]
Protrusion of the intermediate cross section of the wood beam with respect to the cylindrical cover member 11 hardly poses a problem. This is because the material of the wood beam is fragile even when the vehicle wheel is hung, and it is crushed or the edges are torn off and scraped off. The protruding amount of the wood beam is sufficiently acceptable up to about 5 to 10 mm. However, if it is more than this, it is possible to assume the sinking along the grain. From this possibility, in the case of left-hand traffic, it is preferable that the direction from the end side of the wood beam 10 to the front end side coincides with the vehicle traveling direction. In the example of FIG. 1, in the arrangement of the wood beam 10, the end side may be the left side. If it does in this way, in the dimensional relationship of Drawing 2, the quantity of projection point 18 to cylindrical cover member 11 of wood beam 10 can be kept at the optimal value.
[0024]
FIG. 4 is a perspective view showing an example in which a cylindrical cover member is integrated with a bracket and has a front and rear divided structure. As shown in the figure, the one-piece bracket-type split cylindrical cover member 19 of this example is formed in an arc surface in which the road inner side surface of the rear member 20 is matched to the diameter of the wood beam. Further, by forming the side surface of the front member 21 as a circular arc surface and fitting the upper and lower flange portions of the front member 21 to the upper and lower end surfaces of the rear member, the inner holes are formed as a single body between the two members. The end of the wood beam 10 shown in FIG. 2 can be fitted into the part.
[0025]
Bolt insertion holes 22 and 23 are formed in each of the rear member 20 and the front member 21 so as to couple them together.
[0026]
Since the cylindrical cover member can be configured by combining the rear member 20 and the front member 21, the assembling work of the wood beam 10 is easy. In addition, it is possible to easily replace the wood beam.
[0027]
FIG. 5 shows an example in which a design change is made to the cylindrical cover member 11 shown in FIG. The cylindrical cover member 24 of this example has an opening 25 in the middle of the cylindrical portion. Thus, the cylindrical part in the cylindrical cover member does not have to be a complete cylindrical shape, and can be variously modified. It does not matter if the left and right cylinder diameters are different.
[0028]
FIG. 6 is a perspective view showing an application example when the wood beam is square. In this example, the wood beam 26 is a square, and the inner hole shape of the cylindrical cover member 27 is also a square, and there is no difference from the previous example. The cutting of the end portion of the wood beam 26 is shown as an example in which all four surfaces are cut, but as a requirement of the present invention, only the front surface is sufficient.
[0029]
FIG. 7 is an explanatory diagram showing the cross-sectional shapes of the wood beams to which the present invention can be applied. (A) The figure shows the wood beam 27 with only the front face of the log shaved. (B) The figure shows a drum-shaped wood beam 28 made by cutting both sides of a log. (C) The figure shows a rectangular wood beam 29 that is long vertically. (D) The figure shows the example of the combination-type wood beam 32 which connected the pair of log 30 arrange | positioned up and down with the connection board 31. FIG. In any case, the front surface of the cover member protrudes from the intermediate section by cutting with a dimension d1 larger than the thickness d of the cylindrical cover member in relation to the cylindrical cover member made in accordance with these shapes. It can be set as the structure which does not do.
[0030]
The present invention is not limited to the embodiment described above, and can be appropriately modified in design without departing from the gist of the present invention, and can of course be implemented in various modes. .
[0031]
【The invention's effect】
As described above, the present invention provides beam support brackets on the inside of a plurality of pillars erected along the roadside, and abuts the ends of the wood beams respectively extended from adjacent pillar sides. In the wood beam mounting structure in the wooden guard fence which covers the ends of the two wood beams near the pillars using the cover member and supporting the pillars in the shape of the wood beam, the opening direction of the cover member is the wood It is composed of a cylindrical member coinciding with the beam extending direction, and both ends of the wood beam are cut to an amount larger than the thickness of the cylindrical member and to a size that can be fitted into the inner hole of the cylindrical member. And the wood beam mounting structure for the wooden guard fence is characterized in that the road inner surface of the cover member does not protrude outward from the intermediate cross section of the wood beam.
[0032]
Therefore, if the vehicle collides with the wood beam and is guided in the direction of the column while applying force to the wood beam, the smooth guidance condition of the tire wheel can be adjusted, and there is no possibility that the vehicle wheel will be caught in the cover member. In addition, an extremely high acceleration can be secured without giving an excessive acceleration to the vehicle, particularly a small vehicle. As a result, since an excessive force is not applied to the support column, it is not necessary to design the support column with high strength, and a compact design is possible.
[0033]
If you use a wood beam that cuts both ends of a log to the same diameter, and uses a wood beam with upper and lower through-holes in accordance with the fixing holes provided in the cylindrical member, the standard of a simple wood beam It is possible to produce a high-performance, high-safety collision-resistant wooden guard fence with high landscape and low cost.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an example of a wooden guard fence embodying the present invention.
FIG. 2 is a plan view of a log wood beam used for the wooden guard fence shown in FIG.
3 is a perspective explanatory view showing details of a wood beam mounting structure of the wooden guard fence shown in FIG. 1; FIG.
FIG. 4 is a perspective view showing another embodiment of a wood beam mounting structure in a wooden guard fence.
FIG. 5 is a perspective view showing still another embodiment of a wood beam mounting structure in a wooden guard fence.
FIG. 6 is a perspective view showing an example in which a wood beam mounting structure in a wooden guard fence is applied to a square wood beam.
FIG. 7 is an end view showing another example of the shape of a wood beam to which the present invention can be applied.
FIG. 8 is a plan view showing a wood beam mounting structure in a conventional wooden guard fence.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Prop 5 Vehicle 6 Guiding direction 7 Wooden guard fence 8 Roadside 9 Bracket 10, 26 Wood beam 11 Cylindrical cover member 12 Through-hole 13, 16, 22, 23 Hole 14, 17 Bolt 15 Nut 18 Wood beam protrusion Point 19 Split-type cylindrical cover member 20 having a single bracket type Rear member 21 Front member 25 Opening D Wood beam cutting section diameter D1 Wood beam end section diameter D2 Wood beam former section diameter d Cylindrical cover member Thickness d1 End cutting amount

Claims (3)

A beam support bracket is provided inside a plurality of support columns erected along the roadside, and the ends of the wood beams extended from the adjacent support column sides are butted against each other to support the support columns. In addition, in the wood beam mounting structure in the wooden guard fence that covers the ends near the pillars of both wood beams using the cover member,
The cover member is composed of a cylindrical member whose opening direction coincides with the extending direction of the wood beam,
Cutting both ends of the wood beam to an amount larger than the thickness of the tubular member and to a dimension that allows fitting into the inner hole of the tubular member,
A wood beam mounting structure for a wooden guard fence, wherein a road inner surface of the cover member does not protrude outward from an intermediate section of the wood beam.   The inner hole shape of the cylindrical member is circular and has the same left and right diameters, and both end portions of the wood beam are cut to the same left and right diameters so that they can be fitted into the circular inner holes. The wood beam mounting structure in the wooden guard fence according to 1.   The said cylindrical member is divided | segmented and divided | segmented into the rear member combined also with the said bracket, and the front member joined from the front side and forming a cylindrical inner hole between them, It is characterized by the above-mentioned. Wood beam mounting structure in the wooden guard fence described.

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