JP4097504B2 - Movement restriction device for bridge support - Google Patents

Description

【００２１】
【発明の効果】
この発明は上記のように、ベースプレート上に、上沓と下沓とを備えた支承体を設置し、前記支承体の橋軸直角方向側部のベースプレート上に、実質的に支承体の橋軸直角方向の移動のみを規制する移動制限部材を設置した橋梁用支承体の移動制限装置において、前記移動制限部材を、断面円形または多角形状で棒状の支柱部の下端にベースプレートに埋入して螺嵌するネジ部からなる固定部を設け、該支柱部の上端に、支柱部よりも前記上沓側に突出して上沓に当接する当接部を設け、該支柱部に前記支承体に所定以上の水平力が作用した際に剪断する剪断特定部を形成して構成し、該剪断特定部を支柱部の剪断強度を低下させる支柱部周長方向に連続または間欠的なノッチとするとともに、前記支承体に橋軸直角方向の水平力が作用していない状態では前記当接部と上沓との間にすき間を有するように前記移動制限部材をベースプレート上に設置したので、移動制限装置自体の重量を軽減でき、取扱いや、取付け作業性も良く、安価で生産性の向上を図ることが出来る効果がある。
【図面の簡単な説明】
【図１】この発明を実施した橋梁用支承体の移動制限装置の橋軸直角方向の正面図である。
【図２】図１の側面図である。
【図３】（ａ），（ｂ）は、移動制限部材の正面図と、Ａ−Ａ矢視断面図である。
【図４】（ａ），（ｂ）は、移動制限部材の他の実施形態の正面図と、Ｂ−Ｂ矢視断面図である。
【図５】従来の橋梁用支承体の移動制限装置の橋軸直角方向の正面図である。
【図６】図５の側面図である。
【図７】移動制限装置の一実施例を示す説明図である。
【符号の説明】
１ 移動制限部材 ２ 支承体
２ａ 上沓 ２ｂ 下沓
３ 取付け裾部 ４ ベースプレート
５ 取付けボルト Ｇ 重心位置
６ 下部構造物 ７ 上部構造物
８ 移動制限部材 ９ 剪断特定部
１０ 固定部 １１ 当接部
１２ 支柱部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a movement restricting device for a bridge support, and more particularly, to a movement restricting device for a bridge support that can reduce weight and improve economy and productivity.
[0002]
[Prior art]
Conventionally, in order to restrict the horizontal movement of an upper structure such as a bridge girder, as shown in FIGS. 5 and 6, a bridge shaft is mounted on a base plate 4 of a support body 2 having an upper rod 2a and a lower rod 2b. It is known to install the movement restricting member 1 in a perpendicular direction (arrow direction).
[0003]
When the movement restricting member 1 is installed on the side of the support body 2 in the direction perpendicular to the bridge axis, the steel material is cut into an inverted T shape, and the mounting skirt 3 is mounted on the base plate 4 with a plurality of mounting bolts 5. The mounting bolt 5 is designed to be strong enough to be damaged during a large earthquake exceeding the seismic intensity method (see, for example, Patent Document 1).
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-172623 (page 3, column 4, FIGS. 1 (a), (b), (c))
[0005]
[Problems to be solved by the invention]
However, in order to break with the mounting bolt 5 in the event of a large earthquake, it is necessary to set the combined stress of the shear stress and the tensile stress when the horizontal force is applied due to an earthquake or the like as close as possible. The center of gravity position G of the bolt 5 must be manipulated and adjusted. As a result, the cross section of the movement restricting member 1 itself becomes considerably large and heavy, resulting in poor handling and mounting workability and high cost. There was a problem that productivity could not be improved.
[0006]
The present invention pays attention to such a conventional problem, and is a bridge that can improve the productivity at a low cost because the movement restricting device is made of a light and small bar-like material, has good handling and mounting workability. It is an object of the present invention to provide a movement restricting device for a bearing body.
[0007]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention provides a support body provided with an upper rod and a lower rod on a base plate, and substantially supports the support body on the base plate on the side perpendicular to the bridge axis. In a movement restriction device for a bridge support body, which is provided with a movement restriction member that restricts only the movement in the direction perpendicular to the bridge axis, the movement restriction member is embedded in a base plate at the lower end of a rod-shaped column having a circular or polygonal cross section. A fixing portion comprising a screw portion to be screwed in is provided, and an abutting portion is provided at the upper end of the column portion so as to protrude from the column portion toward the upper collar side and abut on the upper collar. A shear specific part is formed by shearing when a horizontal force of a predetermined level or more is applied, and the shear specific part is formed as a continuous or intermittent notch in the circumferential direction of the column part that reduces the shear strength of the column part. , horizontal force of Hashijiku perpendicular to the scaffold In a state where no action is intended to subject matter in that the movement limiting member so as to have a gap between the contact portion and the upper shoe is placed on the base plate.
[0008]
Here, it is also possible to provide a plurality of the support columns at intervals in the bridge axis direction, and to connect the plurality of support columns by the contact portion .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0011]
In addition, the same component as a prior art example attaches | subjects the same code | symbol, and abbreviate | omits description.
[0012]
FIG. 1 is a front view in a direction perpendicular to the bridge axis of a bridge support movement restricting device embodying the present invention, FIG. 2 is a side view of FIG. 1, and upper and lower portions 2a and 2b are provided at the upper and lower portions. The support body 2 is installed on a base plate 4.
[0013]
The base plate 4 is installed on the lower structure 6, and the upper structure 7 is installed on the upper collar 2 a of the support body 2.
[0014]
As shown in FIGS. 1 and 2, a movement restricting device for restricting the movement of the support body 2 in the direction perpendicular to the bridge axis is provided on the base plate 4 on the side of the support body 2 in the direction perpendicular to the bridge axis (arrow X direction). The movement restricting member 8 is configured, and a part of the movement restricting member 8 is sheared such as a notch (notch) that shears when a predetermined horizontal force is applied to the support body 2. A specific portion 9 is formed.
[0015]
The movement restricting member 8 is made of a steel portion provided with a fixing portion 10 formed of a screw portion or the like installed on the base plate 4, a contact portion 11 that contacts the upper collar 2 a of the support body 2, and the shearing specific portion 9. And one or a plurality of supporting columns 12 (in this embodiment, there are two, but three or more can be provided).
[0016]
As shown in FIGS. 3 (a) and 3 (b), the movement restricting member 8 is formed by a steel column having a circular cross section as shown in FIGS. 4 (a) and 4 (b). The support column 12 is formed of a steel material having a polygonal cross section (in this embodiment, a quadrangle, but the shape is not limited), and the lower portion of the support column 12 is screwed to the base plate 4 via a fixing unit 10 including a screw unit. The contact portion 11 having a predetermined length is fixed to the upper end of the column portion 12. In the case where there are a plurality of support columns 12, a contact portion connecting the support columns 12 as the contact portion 11 is preferable.
[0017]
The shear specifying portion 9 formed on the support column 12 is formed at an arbitrary height position of the support column 12 and has a predetermined depth in the circumferential direction in order to reduce the shear strength and lead the shear fracture. It is formed continuously or intermittently.
[0018]
Thus, by forming the movement limiting member 8 using a steel material such as a round bar or a square bar, the weight of the movement limiting member can be reduced and the bridge support body can be configured in a compact manner. Also, as in the examples described later, the weight can be reduced by about 20% compared to the conventional steel material, so that it is easy to handle, can be easily assembled, and can be manufactured at low cost. .
〔Example〕
FIG. 7 shows an embodiment of the movement restricting device of the present invention. The movement restriction is made by the height tu of the upper collar 2a, the height hr of the support body 2, the height tl of the lower collar 2b, and the height tb of the base plate 4. The weight of the movement limiting member 8 when the horizontal force H2e is applied to the device at the horizontal force action height hj2 in the table and with the diameter of the support column 12 and is sheared by the shearing specific portion 9 is as follows. Estimated.
[0019]
Height of upper heel 2a tu = 40mm
Height of support body 2 hr = 292.5 mm
Base plate 4 height tb = 100 mm
Lower heel 2b height tl = 50mm
Horizontal force H2e = 1453kN
[0020]
[Table 1]

[0021]
【The invention's effect】
As described above, according to the present invention, a support body having an upper arm and a lower arm is installed on a base plate, and the bridge shaft of the support body is substantially formed on the base plate at a side portion perpendicular to the bridge shaft of the support body. In a bridge support body movement restriction device provided with a movement restriction member that restricts only movement in a right-angle direction, the movement restriction member is embedded in a base plate at the lower end of a rod-shaped column having a circular or polygonal cross section and screwed. A fixing portion including a screw portion to be fitted is provided, and an abutting portion is provided at the upper end of the column portion so as to protrude from the column portion toward the upper collar side and abut on the upper collar. with the horizontal force is constructed by forming a shearing specific portion is sheared when applied, a continuous or intermittent notches the shear specific portion to the support portion circumference direction to reduce the shear strength of the strut, the The horizontal force in the direction perpendicular to the bridge axis acts on the support body. Since the absence installed the travel limiting member so as to have a gap on the base plate between the abutting part and the upper shoe, it can reduce the weight of the movement restriction device itself, handling and, mounting workability is good, There is an effect that productivity can be improved at low cost.
[Brief description of the drawings]
FIG. 1 is a front view in a direction perpendicular to a bridge axis of a movement limiter for a bridge support body according to the present invention.
FIG. 2 is a side view of FIG.
FIGS. 3A and 3B are a front view and a cross-sectional view taken along line AA of the movement restricting member. FIGS.
FIGS. 4A and 4B are a front view of another embodiment of a movement restricting member and a cross-sectional view taken along the line BB. FIG.
FIG. 5 is a front view of a conventional bridge support body movement restriction device in a direction perpendicular to the bridge axis.
6 is a side view of FIG. 5. FIG.
FIG. 7 is an explanatory diagram showing an embodiment of a movement restriction device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Movement restriction member 2 Support body 2a Upper collar 2b Lower collar 3 Mounting skirt part 4 Base plate 5 Mounting bolt G Center of gravity position 6 Lower structure 7 Upper structure 8 Movement restriction member 9 Shear specific part 10 Fixing part 11 Contact part 12 Strut Part

Claims (2)

On the base plate, it is placed a bearing body having an upper shoe and a lower shoe, on the base plate of the bridge axis perpendicular sides of the scaffold, to restrict only the movement of the bridge axis at right angles a direction substantially scaffold In the movement restriction device for a bridge support body provided with a movement restriction member, the movement restriction member includes a screw portion that is embedded in a base plate and screwed into a lower end of a rod-like column portion having a circular or polygonal cross section. And a contact portion that protrudes toward the upper collar side of the support column and contacts the upper support is provided at the upper end of the support column , and when a horizontal force of a predetermined level or more is applied to the support body on the support column. A shearing specific portion to be sheared is formed and configured, and the shearing specific portion is a continuous or intermittent notch in the circumferential direction of the support column that reduces the shear strength of the support column, and the support body is perpendicular to the bridge axis direction. the abutting portion in a state where the horizontal force is not applied Movement limiting device for bridges scaffold, characterized in that the movement limiting member so as to have a gap placed on the base plate between the upper shoe. The movement restriction device for a bridge support according to claim 1 , wherein a plurality of the support columns are provided at intervals in the bridge axis direction, and the plurality of support columns are connected by the contact portion.

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