JPS605064Y2 - hinge bearing - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a hinge support placed at the center of a bridge girder constructed by the cantilever construction method.

To construct a bridge using the cantilever construction method, as shown in Figure 1, the pier (substructure) B is manufactured in advance, a mobile work vehicle (Wagen) is assembled on the pier B, and the bridge girder (
The superstructure G is manufactured using the mobile work vehicle in the form of blocks in sequence toward the center of the span, and is manufactured in a cantilevered state while being joined, and the bridge girder G faces each other using hinge supports H at the center of the span. This method involves connecting and constructing.

Conventionally, the hinge bearing H that connects the bridge girder G at the joint surface of the bridge girder G at the center of the span is shown in Fig. 2 in order to smoothly release the expansion and contraction of the bridge girder G due to temperature changes and displacements such as tilting that occur when vehicles run. The structure shown is used.

That is, a female hinge 2 having a generally U-shaped vertical cross section and having opposing legs 1.1 formed on one side of the bridge girder G is attached to the legs 1, 1 by means of anchor bolts (or PC steel rods) 3.
1 are arranged to face each other in the vertical direction, and the other bridge girder G has a boss part 5 with a convex curved surface 4 formed at the end. A male hinge 6 having a generally T-shaped vertical cross section is attached to the anchor bolt. (or PC steel rod) 7, the convex curved surface 4 of the boss part
The female hinge is arranged so that it is in sliding contact with the legs 1, 1, and the sliding contact between the legs 1, 1 and the convex curved surface 4 allows displacements such as expansion and contraction of the bridge girder G and tilting to be released. ing.

However, when this structure is installed, the legs 1, 1 of the female hinge and the convex curved surface 4 of the male hinge are misaligned, in other words, the legs 1, 1 and the convex curved surface 4 are in one-sided sliding contact, and the sliding contact To prevent this, the legs 1, 1 of the female hinge and the convex curved surface 4 of the male hinge must be installed parallel to each other so that they slide smoothly, and the bridge axis Since there is no locking means in the right angle direction (width direction), in other words, there is no function to support the force acting in this direction, the relative positions of the bridge girders G in the width direction are maintained and the force in this direction is supported. Supports must be provided separately, and furthermore, when an excessive force such as an earthquake is applied in the axial direction of the bridge, the resulting force cannot be absorbed, resulting in various problems such as damage to the bridge girder G and the supports.

The present invention was developed to solve these problems.It facilitates position adjustment during installation, supports the force acting in the direction perpendicular to the bridge axis, and is also capable of supporting forces acting in the direction perpendicular to the bridge axis. This provides a hinge support that can absorb force even if the

That is, in a hinge support composed of a female hinge that connects opposing cantilever bridge girders at their joint surfaces and a male hinge that fits into the female hinge, the female hinge has a circular concave portion and the male hinge has a convex portion. A boss portion having a spherical surface is formed, and the boss portion of the male hinge is fitted into the circular concave portion of the female hinge with its convex spherical surface slidingly in contact with the inner peripheral surface of the circular portion. A space is formed by the circular recess and a boss of a male hinge fitted in the recess, and the space produces an air damper effect when an excessive force is applied. This is what we provide.

Hereinafter, the present invention will be described in detail with reference to preferred embodiments thereof, which are illustrated in FIGS. 3 and 4 of the accompanying drawings.

In FIGS. 3 and 4, reference number 10 is a female hinge disposed on one of the bridge girders G of the cantilever beam, and the female hinge 1
0 has a circular recess at one end (circular in the plane that cuts perpendicularly to Figure 3 and concave in the plane of Figure 3.

This is called a circular recess) 11, and the other end is provided with a base 12 for fixing to the bridge girder G, and the female hinge 1
0 is an anchor bolt (or PC
Steel rod) 13. It is fixed to the bridge girder G by 13.

Reference numeral 14 denotes an air suction/discharge hole provided through the outer circumferential surface of the female hinge 10 and the inner circumferential surface of the circular recess 11;
4 is formed near the bottom of the circular recess 11.

Reference numeral 15 denotes a male hinge disposed on the other bridge girder G of the cantilever beam, and the male hinge 15 has a convex spherical surface at one end (the part that contacts the circular concave portion of the female hinge has the shape of a round slice of a sphere).

This is called a convex spherical surface) 16;
The other end is provided with a base 18 for fixing to the bridge girder G,
The male hinge 15 is arranged such that the convex spherical surface 16 of the boss portion 17 is slidably fitted into the circular recess 11 of the female hinge 10 and the inner circumferential surface of the recess. or PC@bar) 19. It is fixed to the bridge girder G by 19.

A space 20 is formed by a circular concave portion 11 of the female hinge and a boss portion 17 having a convex spherical surface 16 of the male hinge, and the space 20 is communicated with the outside air through the suction and discharge holes 14.

With this configuration, displacements such as expansion and contraction and inclination of the bridge girder G can be smoothly released by sliding contact between the convex spherical surface 16 of the male hinge and the inner circumferential surface of the circular recess 11 of the female hinge.
In addition, since the circular concave portion 11 and the convex spherical surface 16 are in sliding contact around the entire circumference,
Forces acting in the direction perpendicular to the bridge axis are also supported, and the bridge girder G
The relative positions of the two can be maintained normally.

Further, the relative position of the male hinge 15 and the female hinge 10 can be easily adjusted during installation because the convex spherical surface 16 of the male hinge and the circular recess 11 of the female hinge fit together and are in sliding contact all around. At the same time, during expansion and contraction, the convex spherical surface 16 and the inner circumferential surface of the circular recess 11 do not come into sliding contact in a one-sided state.

Furthermore, when an excessive force such as an earthquake acts in the direction of the arrow a in the figure in the bridge axis direction, the air contained in the space 20 formed by the circular recess 11 and the boss 17 having a convex spherical surface is By compressing the side surface including 16 by the piston action of the boss part 17, which acts as a piston plate, and gradually discharging it through the suction/discharge hole 14, or if an excessive force is applied in the direction indicated by the arrow in the figure, the space 20 The boss portion 17 acting as a piston creates a negative pressure state in which air is gradually sucked in through the suction/discharge hole 14, thereby creating an air damper effect, thereby protecting the hinge support and the bridge girder G from force. .

Note that the air damper effect can be adjusted by attaching a check valve (not shown) to the suction/discharge hole 14 and adjusting the amount of air suction/discharge.

Further, this effect does not occur at all due to slow movement due to expansion and contraction of the bridge girder G, since air is smoothly sucked and discharged from the suction and discharge holes 14.

Furthermore, in this embodiment, the suction/discharge hole 14 is provided in the female hinge 10, but the suction/discharge hole 14 is provided in the boss portion 17 of the male hinge, that is, it passes through the side surface sandwiching the convex spherical surface 16 provided on the boss portion 17. Similar effects can also be obtained by providing the same effect.

The present invention has the above-mentioned configuration, and allows easy adjustment during installation of the male and female hinges, maintains the relative position of the bridge girders normally without providing additional support in the direction perpendicular to the bridge axis, and is capable of preventing damage caused by earthquakes. It has a great effect of simplifying installation work and maintenance management, such as having a buffering effect against the action of excessive force in the direction of the bridge axis.

[Brief explanation of drawings]

Figure 1 is a side view of a bridge explaining the cantilever construction method, Figure 2 is a partially vertical side view showing a conventional hinge bearing, Figure 3 is a partly vertical side view showing the hinge bearing of the present invention, and Figure 4 FIG. 2 is a perspective view showing the structure of the hinge support of the present invention. 10...Female hinge, 11...Circular recess, 12.18...Base, 15...Male hinge, 16...Convex spherical surface, 17・・・・・・
Boss section, 20...space.

Claims (1)

[Scope of utility model registration request] In a hinge support composed of a female hinge that connects opposing cantilever bridge girders at their joint surfaces and a male hinge that fits into the female hinge, the female hinge has a circular recess and the male hinge has a convex spherical surface. The boss portion of the male hinge is fitted into the circular recess of the female hinge with its convex spherical surface slidingly in contact with the inner peripheral surface of the circular recess. A hinge support characterized in that a space is formed by a circular recess and a boss portion of a male hinge fitted in the recess, and the space produces an air damper effect when an excessive force is applied.