JPH04363402A - Expansion and contraction device for bridge - Google Patents

Abstract

PURPOSE:To realize a bridge which can cope with movements in all direction caused by an earthquake, not to mention a bridge girder bridge axis direction movement. CONSTITUTION:Frames 3, 3a having slide surfaces which are approximately horizontal in a direction right-angled to a bridge axis, are fixed to an abutment 2 and/or a bridge leg. A pedestal 10 is mounted slidably on the slide surfaces of these frames 3, 3a, and at the same time a plate 20 and the pedestal 10 are connected to each other expandably/contractably by mounting on the pedestal the plate 20 fixed at a bridge girder 2 rotatably in a bridge axis direction.

Description

[Detailed description of the invention]

0001

[Industrial Field of Application] The present invention relates to a telescoping device for bridges, and more specifically to a telescoping device for bridges that can accommodate movement of bridge girders in the direction of the bridge axis, in the direction perpendicular to the bridge axis, and even in all directions. It is related to the device.

0002

[Prior Art] Bridges are generally equipped with expansion and contraction devices in order to allow vehicles and others to travel without hindrance in response to displacement of the bridge end due to temperature changes, creep and drying shrinkage of concrete, loads, etc. . Various types of expansion and contraction devices for bridges have been developed and put into practical use.Among them, the finger joint type is a combination of a comb-like plate and a plate with comb-like teeth that mesh with the plate. It is widely used in various fields because it has many features such as a wide range of applicable expansion and contraction and high durability.

0003

[Problem to be solved by the invention] By the way, such a bridge expansion and contraction device can cope with the expansion and contraction of the bridge girder in the direction of the bridge axis, but cannot sufficiently cope with earthquakes whose amplitude direction is not constant. .

The present invention was made to solve the above-mentioned problems, and provides a bridge expansion/contraction device that can handle not only the movement of the bridge girder in the direction of the bridge axis, but also the movement in the direction perpendicular to the bridge axis, and even in all directions. It is intended to obtain.

[0005]

[Means for Solving the Problems] A bridge expansion and contraction device according to the present invention fixes a pedestal having a substantially horizontal sliding surface in a direction perpendicular to the bridge axis to a bridge abutment and/or a bridge pier; A pedestal is slidably mounted on the pedestal, and a plate, one end of which is rotatably fixed to the bridge girder in the direction of the bridge axis, is placed on the pedestal, and the plate and the pedestal are extendably connected. .

[0006] Furthermore, the plate and the pedestal are extendably and retractably connected by a finger joint.

Furthermore, a pedestal having a horizontal sliding surface perpendicular to the bridge axis is fixed to the abutment and/or the pier, and the bridge surface on the sliding surface of the pedestal has a shape that substantially matches the cross slope of the bridge. A pedestal is slidably mounted, and a plate, one end of which is rotatably fixed to a bridge girder in the bridge axis direction, is placed on the pedestal in substantially alignment with the cross slope of the pedestal.

[0008]

[Function] For example, movement of the bridge girder due to temperature changes is absorbed by the pedestal and plate, which are expandable and retractable in the direction of the bridge axis, so that it does not interfere with the running of vehicles, etc. Furthermore, when an earthquake occurs, the bridge girder vibrates through the supports on the abutments and piers, causing relative displacement with the abutments and piers. This displacement is absorbed by the extensible base and plate in the direction of the bridge axis, and in the direction perpendicular to the bridge axis.
It is absorbed by the slippage between the abutment, a trestle fixed on the pier, and a pedestal slidably mounted on the trestle.

[0009]

Embodiment FIG. 1 is a perspective view showing an outline of an embodiment of the present invention, and FIG. 2 is a side view thereof. In the figure, 1 is a bridge abutment, and 2 is a bridge girder made of concrete or steel. 3,3a is H
The frame is made of shaped steel and is fixed on the abutment 1 in a direction perpendicular to the bridge axis by anchor bolts 4 to support a pedestal 10, which will be described later. 5 and 5a are plates fixed by welding or the like on the flanges of the frames 3 and 3a. , Smooth plates 6, 6a, such as stainless steel plates, are attached to the upper surface.

Reference numeral 10 denotes a pedestal having a plurality of comb-like fingers 11 on the bridge surface side, and slide supports 12, 12a placed on plates 5, 5a are screwed to both sides of the lower surface.
A sliding member 13 made of, for example, Teflon (trademark) is attached to the lower surface of the sliding member 13 at a position facing the smooth plates 6, 6a. Reference numeral 14 denotes a substantially convex-shaped pedestal holder fixed to the pedestal 10 with bolts 15 between the sliding bearings 12 and 12a, and its arms connect with guide members 7 and 7a provided on the webs of the pedestals 3 and 3a and flanges. In between, a sliding member 8 such as Teflon (trademark) is disposed so as to be slidable in a direction perpendicular to the bridge axis.

Reference numeral 20 is a finger plate in which a long finger 21 provided at one end engages with the finger 11 of the base 10, and the other end is rotated by a bolt 24 on a rotary holder 23 attached to a fixing base 22 provided on the bridge girder 2. Possibly installed. 25 is a support that supports the bridge girder 2; 26 is a sealing member that is interposed between the pedestal 10 and the abutment 1 to prevent rainwater from entering; 27 is a drainage installed between the anchoring base 22 and the pedestal 10; There is a rubber plate for use.

Next, the operation of the present invention constructed as described above will be explained. For example, when a bridge girder or the like stretches in the direction of the bridge axis due to an increase in temperature, the finger plate 20 extends in the direction of the bridge axis as shown by the arrow to absorb this, so that it does not impede the running of vehicles.

[0013] Furthermore, when an earthquake occurs, the bridge girder 2
It vibrates via the upper support 25, causing a relative displacement with the abutment 1. This displacement is absorbed by the finger plate 20 extendably disposed on the pedestal 10 in the direction of the bridge axis, and is absorbed by the pedestals 3 and 3a fixed on the abutment 1 and the sliding member 13 in the direction perpendicular to the bridge axis. This is absorbed by the slippage that occurs between the pedestal 10 which is slidably mounted on the pedestals 3 and 3a.

FIG. 3 is a cross-sectional view of another embodiment of the invention. Note that the same parts as those in the embodiment shown in FIGS. 1 and 2 are given the same reference numerals, and the explanation thereof will be omitted. In this example, the present invention was implemented in accordance with the cross slope of a bridge that has slopes on both sides from the central part in the direction perpendicular to the bridge axis.
A flat plate 20a without fingers is placed on 0a to form a so-called overlapping joint. Even with this configuration, the effects of the present invention described above can be achieved.

FIG. 4 is a plan view showing essential parts of another embodiment of the present invention, FIG. 5 is a sectional view taken along line AA, and FIG. 6 is a rear view of the pedestal. Note that the same or equivalent parts as in the embodiment of FIGS. 1 to 3 are given the same reference numerals, and the explanation thereof will be omitted. In this embodiment, a plurality of pedestals 10 having fingers 11 are installed on the pedestals 3 and 3a in a direction perpendicular to the bridge axis, and a finger plate 2 is disposed opposite to the pedestals 10.
The fingers 21 of 0 are jointed with the fingers 11 of the pedestal 10. On the bottom surface of the pedestal 10,
As shown in FIG. 6, four sliding bearings 12 to 12c are screwed together, and an elongated sliding member 13 is attached to each of these sliding bearings 12 to 12c. 14a is pedestal presser 1
This is the screw hole for attaching 4.

[0016] In each of the above embodiments, the case where an earthquake occurs with an amplitude perpendicular to the bridge axis is explained, but the present invention also deals with the case where an earthquake with an amplitude occurs in an intermediate direction (45° direction) or in any direction. Even if this occurs, it can be counteracted by the interaction between the finger joint or other telescoping device and the sliding mechanism.

Furthermore, in the above embodiment, the present invention is applied to a bridge constructed between an abutment 1 and a bridge girder 2, but it can also be applied to a bridge constructed between an abutment and a bridge pier or between bridge piers. The invention can be practiced.

[0018]

Effects of the Invention As is clear from the above description, the present invention includes a pedestal that is slidably mounted on a pedestal that is fixed to a bridge abutment and/or a pier in a direction perpendicular to the bridge axis, and one end of which is fixed to the bridge axis in the direction perpendicular to the bridge axis. A plate that is rotatably fixed to the bridge girder is placed on a pedestal, and the two are connected in an expandable and contractable manner, so it can fully handle expansion and contraction of the bridge due to temperature changes, etc., and will not interfere with the movement of vehicles, etc. There isn't.

Furthermore, when an earthquake occurs, displacement of the bridge girder in the bridge axis direction is absorbed by the expandable pedestal and plate, and displacement in the direction perpendicular to the bridge axis is absorbed by the sliding of the pedestal mounted on the pedestal. Therefore, it is possible to realize a bridge that can sufficiently cope with large earthquakes.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an overview of an embodiment of the present invention.

FIG. 2 is a side view of FIG. 1.

FIG. 3 is a side view of another embodiment of the invention.

FIG. 4 is a plan view showing essential parts of still another embodiment of the present invention.

FIG. 5 is a front view of FIG. 4.

FIG. 6 is a bottom view of the pedestal in FIG. 5.

[Explanation of symbols]

1 Abutment 2 Bridge girder 3, 3a pedestal 7, 7a Support member 8,13 Sliding member 10 Pedestal 11, 21 Finger 14 Pedestal presser 20 Finger plate 23 Rotating pedestal

Claims (3)

[Claims] Claim 1: A pedestal having a substantially horizontal sliding surface perpendicular to the bridge axis is fixed to the abutment and/or the pier, the pedestal is slidably mounted on the sliding surface of the pedestal, and one end is attached to the bridge girder. A bridge expansion and contraction device, characterized in that a plate rotatably fixed in the bridge axis direction is placed on the pedestal, and the plate and the pedestal are connected to be expandable and contractible. 2. The bridge extension device according to claim 1, wherein the plate and the pedestal are extendably connected by a finger joint. 3. A pedestal having a horizontal sliding surface perpendicular to the bridge axis is fixed to the abutment and/or the pier, and the bridge surface on the sliding surface of the pedestal has a shape that substantially matches the cross slope of the bridge. For a bridge, characterized in that a pedestal is slidably mounted, and a plate having one end fixed to a bridge girder so as to be rotatable in the bridge axis direction is placed on the pedestal so as to be substantially aligned with the cross slope of the pedestal. Telescopic device.