JPS5941215Y2 - Movable bearing with shock absorber - Google Patents

Description

[Detailed description of the invention] This invention is a movable support that supports the main load of the superstructure such as the bridge girder in a bridge and smoothly releases the expansion, contraction and tilting of the superstructure due to temperature changes. The present invention relates to a so-called damper-equipped bearing, that is, a movable bearing with a damper.

In general, the main function of movable bearings, regardless of whether they are sliding or rolling types, is to relieve slow displacements such as expansion and contraction of bridge girders and tilting due to temperature changes, and when sudden displacements such as earthquakes occur. However, problems such as damage often occur.

In order to eliminate this problem, Motoyama Department first implemented the
In the invention disclosed in Japanese Utility Model Publication No. 3451, Japanese Utility Model Publication No. 52-4759, or Japanese Utility Model Publication No. 52-13795, a shock absorbing device consisting of an oil damper or the like that absorbs sudden displacement is horizontally assembled to the main body and measuring section of the movable support. proposed a structure.

By the way, in all of these existing proposed shock absorbers, the shock absorbers function only against the horizontal force acting on the bearings, and the upward lift of the bridge girder (and eventually the bearings) due to seismic motion (
To prevent uplifting), fixing of uneven parts separately provided on the bearing (Utility Model Publication No. 49-3451 and Utility Model Publication No. 52-475)
No. 9) or floating locking member (Jikko Sho 5)
No. 2-13795), etc., do not consider preventing the bridge girder from floating during an earthquake and absorbing the upward lift force with a shock absorber.

For this reason, existing floating stops are subjected to the shock of sudden upward lifting force associated with earthquake motion, and this impact causes problems such as damage to the floating stops, that is, the bearings, and furthermore, the damage makes it difficult for shock absorbers to function. □There is a problem that it cannot fulfill its function and cannot exhibit the intended effect as a support with a shock absorber.

In view of the above-mentioned circumstances, the present invention was devised to overcome the drawbacks of conventional bearings with shock absorbers. The object of the present invention is to provide an economical design that simultaneously absorbs sudden horizontal force and upward lift caused by seismic motion, effectively protects the bearing against seismic motion, and provides an economical design.

Hereinafter, the present invention will be explained based on the drawings.

1 to 3 show an embodiment of the present invention, in which 1 and 2 are upper and lower shoes, and 3 is a cylindrical roller.

The upper shoe 1 and the lower shoe 2 are in contact with the roller 3 via bearing plates 1a and 1b, respectively.

Furthermore, shock absorber mounting portions 11 and 21 are formed at both ends of the upper shoe 1 and the lower shoe 2 in the direction perpendicular to the bridge axis.

Reference numerals 4 and 5 designate shock absorbers made of oil dampers and the like arranged in a cross-shape with each other.

In this embodiment, the shock absorbers 4 and 5 are cylinders 4a and 5.
A known dashpot type oil damper is illustrated, which is composed of a piston rod 4b and a piston rod sb.

Shock absorber attachment parts 11 and 21 of the upper shoe 1 and the lower shoe 2,
The attachment of the shock absorbers 4 and 5 consists of the following configuration.

That is, the shock absorber mounting portion 11 of the upper shoe 1 has an outer concave portion 111 to which the rod 5b of the damper 5 is attached at one end, and a notch 112 and the rod of the damper 4 at the other end. The inner recesses 113 to which the shock absorbers 4b are attached are provided at different positions so that the shock absorbers 4 and 5 cross each other.

114 and 115 are protrusions. 116 and 117 are bolt through holes that pass through the side of the protrusion, and 118 and 11
Reference numeral 9 denotes a bolt hole provided opposite to the bolt through hole 116°11γ.

Further, the shock absorber mounting portion 21 of the lower shoe 2 is formed in a symmetrical relationship with the shock absorber mounting portion 11 of the upper shoe 1, so-called opposite-handed.

That is, 211 is an outer recessed part, 212 is a notch part, and 21
3 is an inward recess.

214 and 215 are protrusions, 216 and 217 are bolt through holes, and 218 and 219 are bolt holes.

In addition, the shock absorbers 4 and 5 include piston rods 4b and 5b.
Pivot parts 41 and 51 are formed at one end of the shaft and the other end.

In this way, the shock absorbers 4 and 5 are mounted on the upper shoe and the lower shoe such that the shock absorber 4 is attached to the piston rod 4b in a cross-shape between the upper shoe 1 and the lower shoe 2. Directional concave part 11
3, the pivot portion 41 provided at the other end is disposed in the inner concave portion 213 of the lower shoe, and the bolt 6 is attached to the protruding portions 115, 2.
It is attached to the upper shoe 1 and the lower shoe 2 by passing it through the pivot portion 41 through the 15 bolt through holes 117 and 217 and screwing it into the bolt holes 119 and 219.

In addition, the shock absorbing device 5 is
11 and 211, respectively, are provided with pivot parts 51 provided at both ends thereof, and are installed by attaching them to the upper shoe 1 and the lower shoe 2 using the same mounting means as the shock absorbing device 4.

The configuration of the present invention is not limited to the illustrated embodiment,
There are various aspects.

That is, (1) the number of rollers is not limited to one, but may be a plurality of rollers, and when there are three or more rollers, it goes without saying that the upper shoe has a pin structure.

(2) The sliding member is not limited to a rolling bearing using rollers, but may also be a sliding bearing using a sliding member as a sliding member.

(3) The mechanism for attaching the shock absorber to the upper shoe and the lower shoe is not limited to bolts, but may also be a ball-shaft head structure.

The behavior of the shock absorber-equipped support of the present invention based on the above configuration in response to earthquake motion will be described below.

In other words, seismic waves propagated to the piers due to an earthquake directly reach the supports.

Since the bridge girder and the piers are structurally insulated by the bearings, severe relative motion (vibration) occurs in these parts.

Among these, the horizontal vibration of the pier becomes the horizontal vibration of the lower shoe, and the upper shoe and lower shoe will be horizontally displaced relative to each other, but since the shock absorber is arranged crosswise, the shock absorber 4 is now pulling When subjected to this, the shock absorber 5 will be subjected to compression.

Next, when the pier swings in the opposite direction due to its natural period, the shock absorber 4 is compressed and the shock absorber 5 is pulled.

In this way, when the upper and lower shoes repeatedly vibrate,
The shock absorbers 4 and 5 act in opposite directions and will absorb harmful movements.

In addition, the seismic motion transmitted to the bridge girder causes upward lift on the bridge girder,
Although a sudden lifting displacement occurs on the support, the shock absorbers arranged in a cross-like manner receive tension and absorb the sudden displacement, effectively suppressing the upward lifting force.

The movable support with a shock absorber of the present invention has the above-mentioned configuration,
Since it exhibits the above-mentioned effects, it has the following various superior effects compared to conventional ones.

■ Sudden horizontal vibrations applied to the bearings due to earthquake motion, etc. are effectively absorbed by the cross-shaped shock absorbers, which receive compression and tension at the same time and alternately, and do not cause harmful displacement to the bridge girder. do not have.

■ The upward lift force applied to the bearing is effectively absorbed by the cross-shaped shock absorbers, both of which provide tensile resistance.

In particular, since the shock absorber's resistance to upward lift is only in the tensile direction (extension direction), no compressive force is applied to the piston rod, and buckling can be avoided.

- Since the upward lift force is absorbed by the shock absorbing device arranged on the support, there is no need to provide a separate lifting prevention device such as an engaging part as in the conventional case.

■ The cross-shaped shock absorber can reduce the impact caused by earthquake motion both horizontally and vertically, so the support structure can be simplified.

[Brief explanation of the drawing]

Fig. 1 is a surface survey of the embodiment of the present invention, Fig. 2 is a view from the A arrow direction (front view) shown in Fig. 1, and Fig. 3 is a perspective view of the mounting of the shock absorbers on the upper and lower shoes. It is a diagram. 1...upper shoe, 2...lower shoe, 3...
...Roller 5...Buffer device. 4゜

Claims (1)

[Scope of utility model registration request] In a movable support consisting of an upper shoe 1, a lower shoe 2, and a sliding member 3 disposed between the upper shoe 1 and the lower shoe 2, at both ends of the upper shoe 1 and the lower shoe 2 in the direction perpendicular to the bridge axis. Shock absorber installation is done by IT department.
, 21 are formed, and the shock absorber mounting is carried out in part 11.2.
1 is a movable support with a shock absorber, in which shock absorbers 4 and 5 are arranged in a cross shape.