JPS5925930Y2 - Structure of hinge bearing - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of 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 (
(Superstructure) G is a bridge girder that is manufactured by the mobile work vehicle in a cantilever state by sequentially manufacturing blocks toward the center of the span and joining them, and facing each other using hinge supports H at the center of the span. This is a construction method in which G is connected and constructed.

Conventionally, the structure of the hinge support H that connects the bridge girder G at the joint surface of the bridge girder G at the center of the span has a second structure 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 etc. run. The one shown in the figure is used.

That is, a female hinge 2 having a substantially U-shaped vertical cross section, in which opposing legs 1.1 are formed on one side of the bridge girder G, is attached to the leg 1 by an anchor bolt (or PC steel bar) 3.
. Bolts (or PC steel rods) 7 are used to fit and arrange the convex curved surface 4 of the boss part so that it comes into sliding contact with the legs 1, 1 of the female hinge, and the bridge girder is assembled by the sliding contact between the legs 1, 1 and the convex curved surface 4. A structure is used that allows displacement such as G expansion/contraction and tilt to escape.

However, with this configuration, when installed, the positions of the legs 1, 1 of the female hinge and the convex curved surface 4 of the male hinge are misaligned, in other words, a relative inclination in the horizontal direction occurs between the legs 1, 1 and the convex curved surface 4. When the bridge girder G expands and contracts, the legs 1, 1 and the convex curved surface 4 come into sliding contact in a one-sided state, causing damage to the sliding surface. 4 must be installed in parallel so that they slide smoothly.

In addition, since there is no locking means in the direction perpendicular to the bridge axis (width direction), in other words, there is no function to support the force acting in this direction, the relative position of the bridge girder G in this direction is maintained and the force in this direction is Supporting bearings must be provided separately.

In addition, when an excessive force such as an earthquake is applied in the direction of the bridge axis, the bridge girder G and bearings may be damaged due to the inability to absorb the force, and furthermore, the sliding surface may be damaged when the bridge girder G expands and contracts. Since it is a line contact, there are various problems such as poor wear resistance when used for a long time compared to a surface contact.

This invention was made to solve these problems.
It is easy to adjust the position during installation, can support forces acting in the direction perpendicular to the bridge axis, and can absorb excessive forces such as earthquakes that act in the direction of the bridge axis. The present invention provides a hinge support structure in which the contact surfaces are in surface contact instead of in line contact.

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 recess and the male hinge has a convex spherical surface. a boss portion is formed, the convex spherical surface has a cylindrical outer peripheral surface;
A sliding member whose inner peripheral surface is formed into a concave spherical surface is fitted by slidingly contacting the concave and convex spherical surface, and the male hinge is fitted into the inner peripheral surface of the circular recess of the female hinge and the convex spherical surface of the boss part. By slidingly fitting the members, when an excessive force is applied, the air damper is generated in the space formed by the four circular parts, the boss having the convex spherical surface, and the sliding member fitted to the convex spherical surface. The present invention provides a hinge support structure characterized in that it produces the following effects.

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 11 at one end and a base 12 for fixing to the bridge girder G at the other end.
Anchor bolt (or PC steel rod) placed in 213.
13.

Reference numeral 14 denotes an air intake/exhaust hole provided through the outer surface of the female hinge and the inner peripheral surface of the circular recess 11, and the air intake/exhaust hole 14 is formed near the bottom of the circular recess.

15 is a male hinge arranged on the other bridge girder G of the cantilever beam, and the male hinge 15 has a boss portion 17 having a convex spherical surface 16 at one end, and a base portion 18 for fixing to the bridge girder G at the other end. ing.

Reference numeral 19 denotes a sliding member, and the sliding member 19 has a cylindrical outer circumferential surface and a concave spherical surface 20 that slides on the inner circumferential surface of the convex spherical surface 16. It is configured such that it can be split along the axis at the splitting portion 21.21 for fitting.

In addition, when the sliding member 19 is held (fitted) to the convex spherical surface 16, after being fitted to the convex spherical surface 16, the divided portion 21.
21 by using adhesive or pin,
Measures may be taken to integrate them using bolts or the like.

The male hinge 15 has an anchor bolt (or a PC steel rod) arranged on the base 18 so that the outer circumferential surface of the sliding member 19 fitted to the convex spherical surface 16 comes into sliding contact with the inner circumferential surface of the circular recess 11 of the female hinge. 22. It is fixed to the bridge girder G by 22.

23 is a space formed by the circular concave portion 11 of the female hinge, the boss portion 17 having a convex spherical surface 16 of the male hinge, and the sliding member 19 fitted to the convex spherical surface 16; It is communicated with.

With this configuration, the bridge girder G expands and contracts through sliding contact between the inner peripheral surface of the circular recess 11 of the female hinge and the outer peripheral surface of the sliding member 19 fitted to the convex spherical surface 16 of the male hinge, which are in surface contact.
In addition, the inclination can be smoothly released by sliding contact between the convex spherical surface 16 and the concave spherical surface 20 of the sliding member, and since the annular recess 11 and the sliding member 19 are in sliding contact over the entire circumference, it acts in the direction perpendicular to the bridge axis. The relative position of the bridge girder G 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 circular recess 11 of the female hinge and the sliding member 19 of the male hinge fit together and are in sliding contact all around. Yes, and also a male hinge 15
Even if the parallelism of the male hinge 15 and the female hinge 10 is slightly out of alignment, this deviation is tolerated by the sliding contact between the concave spherical surface 20 and the convex spherical surface 16 of the sliding member of the male hinge 15, so-called alignment action, and the sliding member 19 is moved during expansion and contraction.
The inner circumferential surface of the circular recess 11 will not come into sliding contact with the inner circumferential surface of the circular recess 11 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 circular recess 11 and the convex spherical surface 16
The air contained in the space 23 formed by the boss portion 17 having the same shape and the sliding member 19 fitted to the convex spherical surface 16 is transferred as if the side surface including the sliding member 19 and the convex spherical surface 16 were a piston plate. When compressed by the piston action of the boss portion 17 and gradually discharged from the suction/discharge hole 14, or when excessive force is applied in the direction indicated by the arrow in the figure,
The space 23 is formed into a negative pressure state in which air is gradually sucked in from the suction/discharge hole 14 by the boss portion 17 acting as a piston, thereby creating an air damper effect, so that the hinge support and the bridge girder G can be protected from this force. It is something.

In addition, in the air damper effect, the 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 the slow movement of the bridge girder G due to expansion and contraction, since air is smoothly sucked and discharged from the suction and discharge holes 14.

Further, 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, the side surface sandwiching the convex spherical surface 16 provided on the boss portion 17 is provided. A similar effect can be obtained even if the hole is provided in a penetrating manner.

The present invention has the above-mentioned configuration, and since the sliding contact between the male hinge and the female hinge is surface contact, the durability is improved, and the male hinge and female hinge can be easily adjusted during installation. The relative position of the bridge girder can be maintained normally without the need for supports, and it also has a buffering effect against the action of excessive force such as earthquakes, which has the great effect of simplifying installation work and maintenance management. It is.

[Brief explanation of the drawing]

Figure 1 is a side view of a bridge explaining the cantilever construction method.
Fig. 2 is a partially longitudinal side view showing the structure of a conventional hinge bearing, Fig. 3 is a partially longitudinal side view showing the structure of the hinge bearing of the present invention, and Fig. 4 is a partially longitudinal side view showing the structure of the hinge bearing of the present invention. FIG. 3 is an exploded perspective view showing the structure. 10...Female hinge, 11...Circular recess, 12.18...Base, 15...Male hinge, 16...Convex spherical surface, 17・・・・・・
Boss portion, 19...Sliding member, 20...
Concave spherical surface, 23...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 concave portion, and the male hinge has a boss portion having a convex spherical surface. A sliding member having a cylindrical outer circumferential surface and a concave spherical inner circumferential surface is fitted into the convex spherical surface by slidingly contacting the concave and convex spherical surfaces, and the male hinge is fitted to the inner circumference of the circular recess of the female hinge. By slidingly fitting a sliding member fitted into the convex spherical surface of the boss part onto the surface, when an excessive force is applied, the sliding member is fitted into the boss part having the circular recess and the convex spherical surface and the convex spherical surface. A structure of a hinge support, characterized in that an air damper is created in the space formed by the sliding members brought together.