JPH076170B2 - Bridge girder lateral movement restriction device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a bridge girder lateral movement limiting device installed between a plurality of rubber bearings provided at intervals in the girder width direction.

[Conventional technology]

Conventionally, as bridge girder lateral movement limiting devices, those disclosed in Japanese Utility Model Publication No. 60-62520 and Japanese Utility Model Publication No. 61-206710 are known.

[Problems to be Solved by the Invention] In the case of the bridge girder lateral movement limiting device shown in the above-mentioned Japanese Utility Model Laid-Open No. Sho 60-62520, the locking upward projection is circular and the side surface of the locking downward opening recessed portion. Since it is a flat surface, the locking upward projection and the locking downward opening recess are in line contact with each other, so that there is a drawback that the upward projection and the downward opening recess cannot be strongly pressed against each other.

In the case of Japanese Utility Model Laid-Open No. 61-206710, the rubber cap is simply put on the upper part of the rod-shaped body, and the rubber cap is fitted into the casing provided in the bridge girder. Between the housing and the top plate of the casing, dust easily collects, and in the longitudinal direction of the bridge girder,
There is a drawback that the rubber cap cannot be firmly attached.

It is an object of the present invention to provide a bridge girder lateral movement limiting device that solves the problems of the conventional bridge girder lateral movement limiting device and has other excellent effects.

[Means for Solving the Problems]

In order to achieve the above object, in the bridge girder lateral movement restricting device of the present invention, a rubber bearing 3 is interposed between both sides of the lower part of the concrete bridge girder 1 in the width direction and the upper part of the concrete lower structure 2. In the bridge girder lateral movement restricting device provided together with the bridge girder movable support device, an insertion guide metal fitting 5 having a guide protrusion 4 extending in the girder longitudinal direction and a receiving guide metal fitting 7 having a guide groove 6 extending in the girder longitudinal direction are provided. , Are arranged to face each other vertically between the rubber bearings 3, and the guide ridges 4 are inserted into the guide grooves 6,
The insertion guide metal fitting 5 is fixed to the concrete lower structure 2, the receiving guide metal fitting 7 is fixed to the concrete bridge girder 1, and between the top surface of the guide protrusion 4 and the groove bottom surface of the guide groove 6, A spacer packing 8 having a spring constant lower than that of the rubber bearing 3 is interposed, and the spacer packing 8 is provided.
Locking protrusion 9 provided at the center in the width direction at the bottom of the
Is fitted into a locking recess 10 provided at the top of the guide protrusion 4, and both side surfaces of the guide protrusion 4 in the width direction and the guide groove 6 are inserted.
A space is provided between the groove and the side surface of the groove, and the spacer packing 8 is fitted into the bottom side of the guide groove 6.

[Action]

When the concrete bridge girder 1 rotates, the spacer packing 8 is compressed, and when the bridge girder 1 tries to move laterally due to the seismic force in the width direction of the bridge girder, the groove side surface of the guide groove 6 in the receiving guide fitting 7 is located in the insertion guide fitting 5. The lateral movement of the bridge girder 1 is restricted by engaging with the side surface of the guide ridge 4.
Further, when the supported portion of the bridge girder 1 by the rubber bearing 3 moves in the longitudinal direction of the bridge girder, with the guide projection 4 of the insertion guide metal fitting 5 inserted in the guide groove 6 of the receiving guide metal fitting 7, the insertion guide The metal fitting 5 and the receiving guide metal fitting 7 move relatively.

〔Example〕

Next, the present invention will be described in detail based on the examples shown in the drawings.

FIGS. 7 to 10 show a spacer packing 8 used in the embodiment of the present invention, in which a strip-shaped rubber material 11 has an upwardly expanding groove-shaped cross section extending in the longitudinal direction of the rubber material 11 at the upper center thereof. A central groove 12 is provided, side grooves 13 having a downwardly expanding groove-shaped cross section extending in the rubber material longitudinal direction are provided at lower portions on both left and right sides of the rubber material 11, and the rubber material 11 extends over the upper surface and side surfaces. , A plurality of locking metal fittings 15 integrally fixed to a sliding plate 14 made of synthetic resin made of ethylene tetrafluoride and further fixed to the lower part of the strip 27 are made of rubber material 11.
Are spaced along the lower center of the strip 27
Is embedded and fixed in the lower portion of the rubber material 11, and the locking metal fitting 15 projecting downward from the lower surface of the rubber material 11 is covered with the rubber material to form the locking projection 9.

FIGS. 1 to 6 show a lateral movement control device for a bridge girder using the spacer packing 8 according to an embodiment of the present invention. The rubber bearings 3 are arranged at intervals in the girder width direction, and the rubber layer 16 in the rubber bearing 3 is arranged.
The lower metal plate 17 fixed to the lower part of the upper metal is embedded in the upper part of the lower structure 2 and is fixed to the lower structure 2 by anchor bolts 18, and is fixed to the upper part of the rubber layer 16. Anchor rods 20 are fixed to the plate 19.

A seat plate in which the lower part of the guide ridge 4 extending in the longitudinal direction of the girder is horizontal
A plurality of locking recesses 10 are integrally fixed to the central portion of the guide projection 21, and are provided at the top of the guide projection 4 at intervals in the girder longitudinal direction, and further on both sides of the seat plate 21 in the girder width direction,
A plurality of through holes 26 for inserting the anchor bolts are provided at intervals in the longitudinal direction of the girder to form the insertion guide metal fitting 5.

A pair of side plates 22 extending in the longitudinal direction of the girder are arranged at intervals in the girder width direction, and the upper part of each side plate 22 is integrally provided at the center side of the lower part of the horizontal support plate 23. The anchor rod 25 to the female screw cylinder 24 that is integrally provided on the upper part of the
The male screw portions of are connected by screwing to form a receiving guide fitting 7 having a guide groove 6 extending in the longitudinal direction of the girder.

The insertion guide fitting 5 is arranged in the middle of each rubber bearing 3, and the seat plate 21 of the insertion guide fitting 5 is embedded in the upper portion of the lower structure 2 and fixed by the anchor bolts 18, and further the spacer packing is used. 8 is placed on the top surface of the guide ridge 4, and the spacer packing 8
The locking projections 9 are fitted into the locking recesses 10 of the guide ridges 4.

Next, the guide ridges 4 and the spacer packing 8 of the insertion guide fitting 5 are inserted into the guide groove 6 of the receiving guide fitting 7, and the groove bottom surface of the guide groove 6 is placed on the spacer packing 8 and As shown in FIG. 3 and FIG. 5, both side surfaces of the spacer packing 8 in the width direction are brought into contact with the groove side surfaces of the guide groove 6 and the guide protrusion 4
A gap is provided between both side surfaces of the guide groove and the groove side surface of the guide groove 6. The length of the guide groove 6 in the longitudinal direction of the girder is set longer than the length of the guide ridge 4, and the guide ridge 4 is arranged in the middle of the guide groove 6 in the longitudinal direction.

Next, after the formwork for constructing the wide bridge girder 1 consisting of box girders is installed, concrete is placed in the formwork, and the support plate 23 in the receiving guide fitting 7 is replaced by the bridge girders 1.
An anchor rod 25 fixed to the support plate 23 and an anchor rod 20 fixed to the upper metal plate 19 are embedded in the bridge girder 1 while being embedded in the lower part of the bridge girder 1.

Fig. 5 shows the spacer packing 8 compressed from the load of the bridge girder 1, and Fig. 6 shows the condition of the bridge girder 1 due to seismic force.
Shows a state in which the lateral side of the bridge girder 1 is restricted because the side surface of the receiving guide fitting 7 abuts against the guide ridge 4 of the insertion guide fitting 5, and the lateral movement of the bridge girder 1 is restricted. When the bridge girder 1 moves laterally, the groove side surface of the receiving guide metal fitting 7 abuts the guide ridge 4 of the insertion guide metal fitting 5 while being buffered by the shear elastic resistance of the spacer packing 8.

When carrying out the present invention, a sliding plate made of a stainless steel plate may be fixed to the inner surface of the guide groove 6.

〔The invention's effect〕

Since the present invention is configured as described above, it has the following effects.

While allowing a large amount of movement of the supported portion of the bridge girder 1, the bridge girder 1 is engaged by the engagement between the guide ridges 4 and the side walls of the guide groove 6.
The lateral movement of the bridge girder 1 can be limited, and when the concrete of the bridge girder 1 is placed, the receiving guide metal fitting 7 is kept floating by the spacer packing 8 from the insertion guide metal fitting 5 and the top of the guide ridge 4 is held. A bridge girder rotation allowance gap can be provided between the surface and the bottom surface of the groove of the receiving guide fitting 7,
Moreover, since the spacer packing 8 has a lower spring constant than the rubber bearing 3, rotation of the bridge girder 1 can be easily allowed, and the spacer packing 8 is embedded and fixed in the lower portion of the spacer packing 8 having a lower spring constant than the rubber bearing 3. Since the locking fitting 15 integrally fixed to the lower part of the strip 27 is fitted in the locking recess 10, even if the spacer packing 8 having a spring constant lower than that of the rubber bearing 3 is used, the spacer packing 8 can be firmly fixed to the guide ridges 4, and when the concrete bridge girder 1 is going to move largely in the width direction of the bridge girder, the receiving guide metal fitting 7 fixed to the concrete bridge girder 1 is inserted. It is possible to strongly prevent the movement of the concrete bridge girder 1 in the width direction of the bridge girder by making surface contact with the built-in guide fitting 5, and furthermore, the guide groove 6 of the receiving guide fitting 7
The spacer packing 8 can prevent dust from entering between the groove bottom surface and the upper surface of the guide protrusion 4.

Further, by fitting the locking projection 9 at the bottom of the spacer packing 8 into the locking recess 10 provided at the top of the guide projection 4, it is possible to reliably prevent the spacer packing 8 from shifting with respect to the guide projection 4. In addition, the spacer packing 8 is fitted into the bottom side of the guide groove 6, and a gap is provided between both side surfaces of the guide protrusion 4 in the width direction and the groove side surfaces of the guide groove 6, so that the bridge width direction of the bridge girder 1 is reduced. When the seismic force is applied, the bridge girder 1 is slightly moved while being buffered by the shear elastic resistance of the spacer packing 8, and the groove side surface of the guide groove 6 in the spacer packing 8 hits the guide ridge 4 of the insertion guide fitting 5. Can be made.

[Brief description of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a front view showing an arrangement state of a rubber bearing and a bridge girder lateral movement limiting device,
2 is an enlarged front view showing a part of FIG. 1, FIG. 3 is a front view of a lateral displacement control device for bridge girders, FIG. 4 is a partially longitudinal side view thereof, and FIG. 5 is a spacer packing compressed. 6 is a plan view of the spacer packing, FIG. 8 is a partial vertical side view of the same, FIG. 6 is a vertical cross-sectional front view showing a state where lateral movement of the bridge girder is restricted, FIG. FIG. 9 is a bottom view of the spacer packing, and FIG. 10 is a vertical sectional front view thereof. In the figure, 1: Concrete bridge girder, 2: Concrete substructure, 3: Rubber bearing, 4: Guide ridge, 5: Insert guide metal fitting,
6: guide groove, 7: receiving guide metal fitting, 8: spacer packing, 9: locking projection, 10: locking recess, 11: rubber material, 12: central groove, 13: side groove, 14: synthetic resin slip Plate, 15: locking metal fittings, 1
6: rubber layer, 21: seat plate, 22: side plate, and 23: support plate.

Claims (1)

[Claims] 1. A bridge girder lateral movement limiting device provided with a bridge girder movable support device in which a rubber bearing 3 is interposed between both sides of a lower part of a concrete bridge girder 1 in the width direction and an upper part of a concrete lower structure 2. An insertion guide metal fitting 5 having a guide protrusion 4 extending in the longitudinal direction of the girder and a receiving guide metal fitting 7 having a guide groove 6 extending in the longitudinal direction of the girder are vertically opposed between the rubber bearings 3. While being arranged, the guide ridges 4 are inserted into the guide grooves 6, the insertion guide fittings 5 are fixed to the concrete lower structure 2, and the receiving guide fittings 7 are made of the concrete bridge girder 1.
The spacer packing 8 having a spring constant lower than that of the rubber bearing 3 is interposed between the top surface of the guide ridge 4 and the bottom surface of the guide groove 6, and the widthwise center of the lower portion of the spacer packing 8 is fixed to The locking projection 9 provided on
It is fitted into a locking recess 10 provided at the top of the guide ridge 4, and a gap is provided between both side surfaces of the guide ridge 4 in the width direction and the groove side surface of the guide groove 6, and the spacer packing 8 is A bridge girder lateral movement limiting device fitted on the bottom side of the guide groove 6.