JPH0325106A - Repairing method for simple girder system multi-span road bridge - Google Patents

Abstract

PURPOSE:To increase rigidity of a bridge and reduce a repairing period, by connecting a girder of a simple girder system multi-span road bridge with each other by a conjunction member, removing the existing concrete slab, and placing and fixing steel slabs on the surface of the girders to make a continuous girder. CONSTITUTION:Bridge piers 1 to a multi-span road bridge are erected at a specified span and arms 9 extending in parallel with the webs 10 of the girder 2 arranged between the bridge piers 1 are arranged so as to stride over the space 3 formed between the girders 2. Next, edges of the arms 9 are connected to the webs 10 by pins 11 to unite respective girders 2 as a unit. Next, existing concrete slabs are removed and a steel slab 12 is placed so that it extends in the longitudinal direction of the road bridge on the upper face of the girder 2 as a unit. And a flange 14 of a main longitudinal insert 13 installed at the lower face of the steel slab 12 is fixed at the upper flange 15 of the girder 2. In this way, a continuous running face of vehicle is realized and rigidity of a bridge can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for repairing a simple girder multi-span road bridge.

[Prior Art] Figures 5 to 7 show an example of a conventional simple girder multi-span road bridge, in which a plurality of Wlllls are erected at predetermined intervals, and a bridge is placed between each pier. One end of the installed girder 2 is fixed to the pier l to restrain horizontal movement and is fixed to a fixed support 28a, and the other end is provided to the pier l by a movable support 26b on the top surface of each girder 2 so as to be movable in the horizontal direction. Concrete floor slabs 4 are placed and fixed respectively.

A gap 3 is formed between the ends of each girder 2 to absorb changes in the length of the girder 2 that expands and contracts due to temperature differences and vibrations. Steel expansion joints 5a, 5 are installed at each end of the floor slab 4.
b is provided.

The expansion and contraction joints 5a and 5b are horizontally slidable and fit together to form a gap 7, and like the gap 3, the length of the concrete slab 4 expands and contracts due to tolerance differences and vibrations. The above-mentioned gap 3
This prevents the wheels of vehicles passing over the road bridge from falling off.

6 in the figure is an asphalt pavement applied to the vehicle running surface of the concrete slab 4, and the upper surface of the asphalt pavement 6 is usually an expansion joint 5a. It is formed to be flush with the upper surface of 5b.

However, the expansion joint 5a. If there is a slight difference in the level of the upper surface of the expansion joint 5b, the expansion joint 5a. An impact force is applied to a vehicle passing over 5b in proportion to the speed of the vehicle, which significantly impedes the riding comfort of the vehicle.

Conventionally, when there is a level difference between the expansion joints 5a and 5b, in order to improve the riding comfort of vehicles passing on a road bridge using a simple girder system, the two-dot chain lines in Figs. The vehicle running surface of a road bridge is simply made continuous by covering the asphalt pavement 6 including the upper surfaces of the expansion joints 5a and 5b to the level shown.

In addition, in road bridges where the concrete deck slab 4 shown in Figures 5 to 7 has become obsolete due to aging after construction, a simple girder type girder 2 as shown in Figure 8 may be used instead of the concrete slab 4. A concrete slab 8 extending in the extending direction of the bridge, which is integrated and continuous, is placed and fixed on the upper surface to form an expansion joint 5a.
．． A method has been proposed in which the vehicle running surface is made continuous by eliminating the 5b.

In FIG. 8, parts with the same reference numerals as in FIG. 5 represent the same parts.

[Problems to be Solved by the Invention] However, in the road bridges shown in FIGS. 5 to 7, even if the asphalt pavement 6 is applied to the level shown by the two-dot chain line, the expansion joints 5a and 5b made of iron are Since the asphalt peels more easily than the concrete part, the expansion joint 5a. At the portion 5b, a level difference may occur due to peeling of the asphalt pavement 6, which may worsen the riding comfort of the vehicle.

In addition, in the road bridge shown in Fig. 8, since the girder 2 remains a simple girder type, the concrete slab 8 located above the gap 3 may be affected by changes in the length of the girder 2 or the load of vehicles passing through the road bridge. There is a problem that cracks occur in the part.

The present invention solves the above-mentioned problems, and aims to provide a continuous vehicle running surface by converting a simple girder type multi-span road bridge into a continuous girder.

[Means for Solving the Problems] The present invention has a plurality of piers erected at predetermined intervals, one end of the girder arranged between each pier is fixedly supported on the pier, and the other end is movably supported on the pier. , in the repair method for a multi-span road bridge using a simple girder system in which a concrete slab is placed on the top surface of each girder, adjacent girders are integrally connected with connecting members, and the existing concrete In addition to removing the deck slab, a steel deck slab that extends integrally in the direction of extension of the road bridge is placed and fixed on top of the girder to create a continuous girder.

[Operations] Adjacent girders will be integrally connected with connecting members, the existing concrete deck will be removed, and a steel deck will be installed on the top of the girder that extends integrally in the longitudinal direction of the road bridge. By placing and fixing the plate, the vehicle running surface is made continuous,
In addition, adjacent girders are more firmly connected to each other via the steel deck slab, thereby making the road bridge a continuous girder.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

Figures 1 and 2 show an example of a multi-span road bridge that has been made into a continuous girder by the repair method of the present invention.
Parts with the same reference numerals as those in the figures represent the same parts.

An arm 9 extending parallel to the web IO of the girder 2 is arranged so as to straddle the gap 3 formed between the adjacent girders 2, and each end of said arm 9 is connected to the web {0 at a respective bin l1. Connect and connect adjacent girders 2 together.

The existing concrete deck slab 4 shown in FIGS. 5 to 7 is removed, and a steel deck slab I2 that integrally extends in the longitudinal direction of the road bridge is placed on the upper surface of the girder 2, and the lower surface of the steel deck slab I2 is placed. The flange l4 of the main longitudinal member 13 provided in the upper flange 1 of the girder 2
It sticks to 5.

According to the above-mentioned simple girder method for repairing a multi-span road bridge, the existing concrete slab 4 shown in Figures 5 to 7
Before removing the concrete deck slab 4, connect the adjacent girders 2 together, make the girder 2 a continuous steel girder, and then connect the concrete deck slab 4 to the steel deck slab 12.
Since the bridge will be replaced with a new bridge, the period during which the road bridge will be closed to traffic will be shortened.

In addition, by placing and fixing the steel deck slab 12 integrally extending in the longitudinal direction of the road bridge on the upper surface of the girder 2, it is possible to make the vehicle running surface continuous, and further Since adjacent girders 2 can be more firmly connected, the rigidity of the road bridge can be extremely increased.

In FIG. 3, in place of the arm 9 shown in FIGS. 1 and 2,
This is an embodiment in which adjacent girders 2 are connected to each other by a tension 3 bolt i6, and in the figure, parts given the same reference numerals as in FIGS. 1 and 2 represent the same parts.

A reinforcing material l8 extending toward the gap 3 is fixed to the end rib l7 located at the longitudinal end of the girder 2, and the reinforcing material l8 is fixed to the web lO to reinforce the end rib l7.

A tension bolt l6 is arranged so as to straddle the gap 3 and pass through each end rib l7 of the adjacent girder 2, and a nut 19 is screwed onto the male threaded portion provided at one end of the tension bolt l6. 2 girders are integrally connected.

Even if the adjacent girders 2 are connected to each other by the tensile symbol l6 instead of the arm 9, the same effects as in the embodiment shown in FIGS. 1 and 2 described above can be obtained.

In FIG. 4, in place of the arm 9 shown in FIGS. 1 and 2,
This is an embodiment in which adjacent girders 2 are connected to each other by a wire lobe 20, and in the figure, parts given the same reference numerals as in FIGS. 1 and 2 represent the same parts.

A vertically extending bracket 2l is fixed to the web 10 so as to be located near the end of the girder 2, and an eye plate 22 is fixed to the surface of the bracket 2l on the gap 3 side.

A hook 23a is attached to one end of a wire rope 20 of a predetermined length, and a hook 23b is attached to the other end via a turnbuckle 24.
and fix the hooks 23a. 23b is engaged with the eye plate 22 provided on each adjacent girder 2, and
Turnbuckles 24 are tightened to integrally connect adjacent girders 2 to each other.

In addition, in FIG. 4, 25 is the web lO and the placket}21
This is a reinforcing material fixed to both sides.

Even if adjacent girders 2 are connected to each other using wire ropes 20 instead of the arms 9, the same effects as in the embodiments shown in FIGS. 1 and 2 described above can be achieved.

Note that the method of repairing a multi-span road bridge using a simple girder method according to the present invention is not limited to the above-mentioned embodiments, but involves removing the existing concrete slab and then joining adjacent girders together. Of course, various changes may be made without departing from the gist of the present invention.

[Effects of the Invention] As explained above, according to the simple girder method for repairing a multi-span road bridge of the present invention, various excellent effects as described below can be achieved.

(1) By mounting and fixing a steel deck slab integrally extending in the longitudinal direction of the road bridge on the upper surface of the girder, it is possible to make the vehicle running surface continuous.

(2) Adjacent girders can be more firmly connected via the steel deck, so the rigidity of the road bridge can be extremely increased.

[Brief explanation of drawings]

Figure 1 is a side view of an embodiment of a multi-span road bridge that has been made into a continuous girder by the repair method of the present invention, Figure 2 is an enlarged arrow view of Figure 1, and Figure 3 is a view of Figure 1. Figure 4 is a side view of the connecting part of the girders showing an example in which adjacent girders are connected using tension bolts instead of the arms shown in Figure 1. 5 is a side view of a conventionally constructed multi-span road bridge using a simple girder system, and FIG.
Figure 7 is a view from the Vl-Vl arrow in the figure, Figure 7 is a view from the ■1■ arrow in Figure 5, and Figure 8 is a multi-span road using a simple girder system with only continuous concrete slabs, which has been proposed in the past. It is a side view of a bridge. In the figure, l is the pier, 2 is the girder, 4.8 is the concrete slab,
9 is an arm (connecting member), 10 is a web, 11 is a pin,
12 is a steel deck slab, l6 is a tension bolt (connecting member),
17 is an end rib, 20 is a wire lobe (connecting member), 2
1 is a bracket, 22 is an eye plate, 23a. 23b
is a hook, 24 is a turnbuckle, 26a is a fixed support,
26b indicates a movable support.

Claims (1)

[Claims] 1) A plurality of piers are erected at predetermined intervals, one end of the girder placed between each pier is fixedly supported on the pier, the other end is movably supported on the pier, and a concrete slab is placed on the top surface of each of the girders. In this method of repairing a multi-span road bridge using a simple girder system, adjoining girders are integrally connected using connecting members, and the existing concrete slab is removed. A method for repairing a multi-span road bridge using a simple girder system, which is characterized by placing and fixing a steel deck slab that extends integrally in the extending direction of the road bridge on the top surface of the girder to form a continuous girder.