JP2001336115A - Rebuilding method of bridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the rebuilding method of a bridge capable of making an object rebuilding a concrete bridge and a steel bridge, remarkably reducing noise during rebuilding work and a dust amount scattering in a circumstance, and being built in short time in the simple configuration of the rebuilding bridge. SOLUTION: A steel shell 11 having a support part 14 on a lower bridge face side is installed in the bridge axis direction of the bridge P of both the sides of an existing bridge to be filled with concrete 16, after concrete 16 is hardened, the upper structure of the erection bridge is removed, and bridged on the support part 14 of both the steel shells 11 to install a floor slab 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for replacing a bridge.

[0002]

2. Description of the Related Art Bridges may need to be replaced due to disasters such as earthquakes and aging. As an example of this type of bridge replacement method, there is an invention disclosed in Japanese Patent Application Laid-Open No. 2000-17618. In the method for replacing a concrete bridge according to the present invention with a steel bridge, a newly formed floor slab separately forming a road surface is installed on the upper surface of an existing concrete slab laid on a pier. A steel girder was installed between the lower surface of both sides of the new steel slab in the bridge axis direction and the pier, and the steel girder and the new steel slab were fixed and replaced with a steel bridge. is there.

[0003] Then, with this configuration,
Rebuilding of concrete bridges that needed to be replaced due to disasters and aging can reduce the effects of noise and dust,
In addition, it says that the traffic cutoff period can be significantly reduced compared to the conventional method.

[0004]

In the above-mentioned prior art, the noise during construction is cut off by a steel plate, so that the soundproofing effect is small, and the structure of the replacement bridge is complicated. It takes a long time for construction. Furthermore, there is a problem that the replacement target is limited to the concrete bridge.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is intended to replace concrete bridges and steel bridges, thereby greatly reducing the noise during the replacement work and the amount of dust scattered around. It is another object of the present invention to provide a method for rebuilding a bridge in which the structure of the rebuilt bridge is simple and can be rebuilt in a short time.

[0006]

According to the present invention, there is provided a method for replacing a bridge, comprising the steps of: providing a substantially U-shaped cross section or a box-shaped cross section on a lower bridge surface in a bridge axis direction on a pier or abutment on both sides of an existing bridge; A steel shell having a supporting portion is installed on the side, concrete is filled in the steel shell, and after the concrete has hardened, the upper structure of the existing bridge is removed, and then a bridge is provided on the supporting portions of the two steel shells. The floor slab was then installed.

Further, after removing the upper structure of the existing bridge, the bridge is supported on both sides of the lower part at a predetermined interval and in the same direction as the steel shell on a pier or abutment between the steel shells installed on the existing bridge. One or more steel shells having a portion are installed, concrete is filled in the steel shell, and after the concrete is hardened, a bridge is bridged on a support portion of an adjacent steel shell to install a floor slab. It was done.

[0008] The method for replacing a bridge according to the present invention is characterized in that both sides of the existing bridge or the direction of the bridge axis on the abutment are substantially U-shaped.
A steel shell filled with concrete inside with a supporting part on the lower bridge surface side in a U-shaped cross section or a box-shaped cross section is installed, then the upper structure of the existing bridge is removed, and The bridge is to be installed on the floor slab.

[0009] After removing the upper structure of the existing bridge, on the pier or abutment between the steel shells installed on the existing bridge, at predetermined intervals and in the same direction as the steel shell, on both sides of the lower part. One or more steel shells having a support portion and filled with concrete are installed therein, and a floor slab is installed by bridging on a support portion of an adjacent steel shell.

[0010] Further, the bridge replacement method according to the present invention comprises constructing a new pier or a new abutment between piers of an erected bridge or between a pier and an abutment.
Alternatively, any one of the above superstructures is constructed on a new pier or a new abutment and a pier or abutment of an existing bridge.

[0011]

[First Embodiment] FIG. 1 is a cross-sectional view showing a state in which the upper structure of a bridge has been replaced by a replacement method according to the present invention. In the figure, G is the ground, and P is the pier of the existing bridge constructed on the ground G. Reference numeral 11 denotes a steel shell installed on the pier P via the bearing 2 in the bridge axis direction on both sides of the bridge, and concrete 16 is cast inside. Reference numeral 20 denotes a floor slab which is installed in a bridge on a support portion 14 provided on a bridge surface side below the steel shell 11, and these constitute the upper structure 10 after replacement. Hereinafter, an example of a bridge replacement method according to the present invention will be described with reference to the drawings.

FIG. 2 is a cross-sectional view of an existing bridge showing a state before the replacement method according to the present invention is implemented, and FIG. 3 is a side view of a part of the existing bridge. This example describes replacement of a relatively wide existing bridge. In the figure, G is the ground, P
Is a pier (including an abutment in the following description) constructed on the ground G. Reference numeral 3 denotes a plurality of steel girders erected on a pier P via a bearing 2, and a floor slab 4 is provided thereon.
Reference numeral 5 denotes a rail provided on both sides of the floor slab 4. The bearing 2, the steel girder 3, the floor slab 4, and the rail 5 constitute an upper structure 1 of the existing bridge.

To replace an existing bridge as described above,
Follow the steps below. (1) One or more anchor bolts are planted on the upper surface slightly inside from both ends of each bridge girder P. (2) As shown in FIG. 4, on both sides of the upper structure 1 of the existing beam, steel shells 11 previously manufactured in a factory are installed on the piers P via the bearings 2.

As shown in FIG. 12, two steel plates 12a and 12b having a length corresponding to, for example, a span of a bridge and a predetermined width (height) are opposed to each other at a predetermined interval, as shown in FIG.
A bottom plate 13 made of a steel plate having the same length as the steel plates 12a and 12b and having a width wider than the interval between the steel plates 12a and 12b is joined to lower ends of the steel plates 12a and 12b to form a substantially U-shape with an open top. It is.

The bottom plate 13 has one end portion formed of a steel plate 12a.
(Or 12b), so that the other end protrudes from the side wall of the steel plate 12b (or 12a) and is integrally joined by welding, and the steel plate 12b (or 1
The projecting portion from 2a) forms a floor slab support portion 14 described later. The support portion 14 is provided with an anchor bolt insertion hole 15a at a position corresponding to the anchor bolt 31 planted on the pier P, and is provided with a bolt insertion hole 15b corresponding to a floor slab described later. ing. Note that the support portion 14 may be formed to be narrower by cutting off a portion other than the portion corresponding to the pier P as shown by a broken line.

In the above description, the case where the steel shell 11 is formed to have a substantially U-shaped cross section with an upper opening is shown, but the upper opening may be closed with a steel plate to form a box-shaped cross section.
In this case, it is necessary to provide an injection hole for injecting concrete into the steel plate.

The steel shell 11 thus configured is installed on the pier P via the bearing 2 as shown in FIG. 13, and the anchor bolt insertion hole 15a provided in the support portion 14 of the bottom plate 13 is connected to the pier P. It is inserted into the planted anchor bolt 31, fixed with a nut, and installed on the pier P. In this case, a block-shaped pedestal 32 may be interposed between the pier P and the support portion 14, as shown by a broken line in FIG.

(3) Next, as shown in FIG. 5, concrete 16 is filled in the steel shell 11 on site. (4) After the concrete 16 has hardened, as shown in FIG. 6, the superstructure 1 of the existing bridge (support 2, steel girder 3, floor slab 4)
5) and dismantle and remove. (5) Then, one or more anchor bolts 31 are provided on the upper surface of each pier P in accordance with the installation position of the steel shell 11a described later.
To plant.

(6) Next, as shown in FIG. 7, a bottom plate 13 is extended to both sides of the steel plates 12a and 12b in a space between the steel shells 11 from which the upper structure 1 has been removed, as shown in FIG. One or a plurality of steel shells 11a (in the figure, two cases are shown.) There is.)
Standing on the pier P at predetermined intervals via the bearing 2 and in the same direction as the steel shell 11, the anchor bolt insertion hole 15 a is inserted into the anchor bolt 31 previously implanted in the pier P,
Install with nuts. (7) Then, as shown in FIG. 8, the concrete 16 is filled in the steel shell 11a.

(8) After the concrete 16 has hardened,
As shown in FIGS. 9 and 10, between each steel shell 11,
Bridging between adjacent supports 14 to precast slab 20
(Hereinafter simply referred to as floor slabs). The floor slab 20 is manufactured in advance at a factory, and has a width slightly smaller than an inner dimension between the adjacent steel shells 11 and is formed to have a predetermined length. As shown in FIG. 15, a shear bonding key 21 composed of, for example, a triangular or trapezoidal convex part and a concave part is formed.
As shown in FIG. 6, one or more bolt insertion holes 22 are provided in the vertical direction in the vicinity of both edges in the width direction of some or all of the floor slabs 20, and the upper surface side has a large diameter. Is formed.

The floor slab 20 is mounted on the supporting portion 1 of the steel shell 11.
When installing on the floor slab 4, first, a floor slab 20 is installed by bridging between the support portions 14 in a portion not corresponding to the pier P, and as shown in FIG. 22
A high-strength bolt 32 is inserted from the upper surface side into the
4 and is fixed with a nut by projecting from the bolt insertion hole 15b. At this time, a mortar or an elastic material 23 may be laid on the support portion 14. Thereby, each steel shell 11 is connected by the floor slab 20, and is firmly fixed.

In this way, the floor slabs 2 are sequentially placed between the piers P.
Set 0. Finally, the protrusion of the anchor bolt 31 from the support portion 14 on the pier P is cut off, and the floor slab 20 is placed on the support portion 14 of the adjacent steel shell 11 in the same manner as described above. Be composed. FIG. 11 shows the state at this time. The floor slabs 20 adjacent in the bridge axis direction are joined by a shear joining key 21 via epoxy resin, mortar, or the like. (8) Finally, if concrete or the like is cast on the upper surface of the floor slab 20, the work of replacing the existing bridge is completed. In the above description, the steel shells 11 and 11a are set on the pier P and then filled with concrete 16 in the interior. It may be installed on top. Thereby, the time required for hardening the concrete 16 can be shortened.

[Examples] Regarding the specifications of the replaced upper structure according to the present embodiment, the type of the target structure,
Various designs are possible depending on the scale and the like, but examples of the dimensions of each part are as follows. The steel shell 11 has a thickness of 9
mm, width (height) 5 m, length 40 m
a and 12b are arranged to face each other with an interval of 0.5 m.
38mm thickness, 0.80 width at the lower end of 2a, 12b
A bottom plate 13 made of a steel plate having a length of 40 m and a length of 40 m is joined by welding so that one end thereof is aligned with the side wall of one side plate (for example, 12a), and the other side is separated from the side wall of the other steel plate 12b by 0.1 mm. The support part 14 was formed to protrude by 30 m.

The steel shell 11 and the floor slab 2 configured as described above
0 to the site, steel shells 11 are respectively installed near both ends of the pier P of the existing bridge, and concrete 1 is placed in the steel shell 11.
6 was charged. After the concrete 16 has hardened, the upper structure of the existing bridge is disassembled and removed, and between the two steels 11, the bridge piers P are separated from each other by 4.6 m (interval at the center).
Then, two steel shells 11a provided with support portions 14 on both sides were installed, and concrete 16 was filled inside.

After the concrete 16 has hardened, 10 m is placed on the support portion 14 except for the portion corresponding to the pier P.
mortar is laid with a thickness of 0.3 m, a floor slab 20 having a thickness of 0.3 m, a width of 4 m, and a length of 2 m is provided thereon.
T) The high-strength bolt 33 was inserted through the bolt insertion holes 22 and 15b, and fixed with nuts. Next, the protrusion of the anchor bolt 31 on the pier P from the support portion 14 was removed, and the floor slab 20 was installed and fixed in the same manner as described above. When the floor slabs 20 were installed, the floor slabs 20 adjacent in the bridge axis direction were sequentially joined to each other by the shear joining key 21 via an epoxy resin, and were fixed to the support portion 14.

According to the bridge replacement method according to the present invention having the above-described structure, concrete-filled steel shells having a high soundproofing effect are installed on both sides of the existing bridge, and then the upper structure of the existing bridge is dismantled. Since the removal is performed, the noise generated during the removal work of the superstructure and the amount of dust scattered around can be significantly reduced.

When a new bridge is erected, a steel shell having a support portion for supporting a floor slab forming a bridge surface is installed on a pier or an abutment, and then the steel shell is filled with concrete. After the hardening, the floor slab is placed on the supporting part of the steel shell, so that a formwork is not required at the time of casting concrete. Furthermore, since concrete is cast on site, it is not necessary to carry or lay heavy objects. As described above, since the present invention has high workability, bridge replacement can be performed in a short time.

In the above invention, steel shells 11 are installed on the piers on both sides of the existing bridge, and after removing the upper structure of the existing bridge, one or more steel shells 11a are installed between the steel shells 11. In the case where the width of the bridge is narrow, for example, as shown in FIG. 1, the steel shell 11a is not provided between the steel shells 11 and the support portions 14 of the steel shells 11 are provided. Floor slab 2
0 may be set.

[Second Embodiment] In the first embodiment, the case where the upper structure 10 is replaced on the pier P of the existing bridge has been described. However, the pier of the existing bridge is damaged or deteriorated depending on the situation. Sometimes. In this embodiment,
In such a case, a new pier (hereinafter, referred to as a new pier including an abutment) is constructed between the piers P, and the upper part according to the first embodiment is placed on the new pier or on the pier of the new pier and the existing bridge. The structure 10 is constructed. According to the present embodiment, not only the upper structure 10 but also the pier P can be replaced.

[Embodiment 3] The following description relates to another embodiment of a method of installing a steel shell and a floor slab, which are essential parts of the present invention. FIG. 17 shows the upper structure 10 after replacement.
FIG. 2 is a perspective view of the device viewed from obliquely below. In the present embodiment, diaphragms 17 serving as nodes are provided at regular intervals in the longitudinal direction in a steel shell 11 having a substantially U-shaped cross section or a box-shaped cross section. Thus, by providing the diaphragm 17 in the steel shell 11, the steel shell 11 and the concrete 16 filled therein can be mechanically integrated.

FIG. 18 shows another structure of the steel shell 11, and as shown in FIG.
A plurality of stiffeners 18 are provided at substantially equal intervals in the vertical direction on the inner walls opposing a and 12b. The stiffeners 18 may be provided on the inner wall of the bottom plate 13 as needed. Stiffener 1
18 is, for example, as shown in FIG. 18 (b), an L-shaped steel material having a length substantially equal to that of the steel shell 3 and a plurality of concrete passage holes 19 provided in a horizontal piece, or FIG. 18 (c). As shown in the figure, a plurality of L-shaped short steel materials are used, and their vertical pieces are joined to the inner wall of the steel shell 11 by welding. According to the present embodiment, a plurality of stiffeners 1
Since the steel shell 11 is provided, the shape of the steel shell 11 can be maintained, and the integration of the steel shell 11 and the concrete 16 can be further promoted.

FIG. 19 shows another example of a method of mounting the floor slab 20 on the support portion 14 of the steel shell 11, and as shown in FIG. A bar-shaped shear joining member 35 such as a dowel is joined by welding or the like, and as shown in FIG. 19C, the through hole 24 is provided at a position facing the shear joining member 35 of the floor slab 20. .

When laying the floor slab 20 on the support portion 14 of the steel shell 11, mortar 23 or the like is laid on the support portion 14 as necessary, and then, as shown in FIG.
The through hole 24 provided on the support portion 14 is fitted to the shear joint member 35. Then, the mortar or concrete 16 is poured into the through holes 24 and solidified, whereby the shear joining member 35 and the floor slab 20 are integrally joined.

The other examples of the steel shell used in the present invention have been described above. However, the present invention is not limited to this, and another steel shell having another structure may be used. Further, the support portion 14 of the steel shell 11
Although another example of the attachment of the floor slab 20 to the slab has been described, it can be attached by other appropriate means.

[0035]

According to the method for replacing a bridge according to the present invention, the bridge is substantially U-shaped in the direction of the bridge axis on the pier or abutment on both sides of the existing bridge.
A steel shell having a support section on the lower bridge surface side with a U-shaped cross section or a box-shaped cross section is installed, concrete is filled inside, and after this concrete hardens, the upper structure of the existing bridge is removed, and both steel shells are removed. After installing the floor slab by bridging on the support of the above, or after removing the superstructure of the existing bridge, place it on the pier or abutment between both steel shells in the same direction as the steel shell at predetermined intervals. ,
One or more steel shells with supporting parts are installed on both sides of the lower part, concrete is filled inside, and after the concrete is hardened, a bridge is placed on the supporting part of the adjacent steel shell and a floor slab is installed. As a result, the following effects can be obtained.

After installing concrete-filled steel shells having high soundproofing effects on both sides of the existing bridge, the existing bridge is dismantled and removed in order to dismantle the superstructure, disperse the noise generated during the removal work and the surrounding area. The amount of dust can be significantly reduced. In addition, since concrete is poured into a steel shell having a substantially U-shaped cross section or box-shaped cross section, no formwork is required at the time of placing concrete. Need not be transported or installed. As described above, since the present invention has high workability, the bridge can be replaced in a short time, and in addition to the concrete bridge, the steel bridge can be replaced.

In the bridge replacement method according to the present invention, since concrete-filled steel shells are used in advance for the steel shells, the amount of noise and dust generated during the disassembly and removal work of the upper structure is significantly reduced. And the construction period can be further shortened.

Further, the method for replacing a bridge according to the present invention includes the steps of: constructing a new pier or a new abutment between piers of an existing bridge or between a pier and an abutment;
Alternatively, since any of the above superstructures is constructed on a new pier or a new abutment and on the pier or abutment of an existing bridge, not only replacement of the superstructure but also a new pier or abutment can be provided.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state in which an upper structure is replaced on an existing bridge according to the present invention.

FIG. 2 is a cross-sectional view of an existing bridge to be replaced.

FIG. 3 is a side view of a part of FIG. 1;

FIG. 4 is an explanatory diagram of a bridge replacement procedure according to the first embodiment of the present invention.

FIG. 5 is an explanatory diagram of a bridge replacement procedure.

FIG. 6 is an explanatory diagram of a bridge replacement procedure.

FIG. 7 is an explanatory diagram of a bridge replacement procedure.

FIG. 8 is an explanatory diagram of a bridge replacement procedure.

FIG. 9 is a sectional view after completion of replacement.

FIG. 10 is a side view of a part of FIG. 8;

11 is a perspective view of FIG. 8 as viewed from obliquely below.

FIG. 12 is a perspective view of an example of a steel shell.

FIG. 13 is an explanatory diagram of an example of installation of a steel shell on a pier.

FIG. 14 is a perspective view of another example of the steel shell.

FIG. 15 is a side view of an example of the floor slab.

FIG. 16 is an explanatory diagram of an example of attaching a floor slab to a support portion.

FIG. 17 is a perspective view of a bridge replaced with a steel shell of another example as viewed obliquely from below.

FIG. 18 is a sectional view of still another example of a steel shell and a perspective view of a stiffener.

FIG. 19 is an explanatory view of another example of attaching the floor slab to the support portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper structure of existing bridge 10 Upper structure of bridge which was replaced 11 Steel shell 14 Supporting part 16 Concrete 20 Floor slab P Pier

Claims (5)

[Claims] 1. A steel shell having a U-shaped cross section or a box-shaped cross section and a supporting portion on a lower bridge surface side is installed in a bridge axis direction on a pier or abutment on both sides of an existing bridge. And filling the concrete with the concrete, and after the concrete has hardened, removing the superstructure of the existing bridge, and then bridging the supporting portions of the two steel shells and installing a floor slab. Replacement method. 2. A steel shell having a U-shaped cross section or a box-shaped cross section and a supporting portion provided on a lower bridge surface side in a bridge axis direction on a pier or abutment on both sides of an existing bridge. After the concrete is hardened, the superstructure of the existing bridge is removed after the concrete has hardened, and then at a predetermined interval on the pier or abutment between the steel shells installed on the existing bridge and the steel shell. In the same direction, one or more steel shells having support portions on both sides of the lower portion are installed, concrete is filled in the steel shells, and after the concrete is hardened, a bridge is placed on the support portions of the adjacent steel shells. A method of replacing a bridge, characterized by installing a floor slab in entanglement. 3. A steel having a substantially U-shaped cross section or a box-shaped cross section having a support portion on the lower bridge surface side and filled with concrete inside in the direction of the bridge axis on the pier or abutment on both sides of the existing bridge. A method for rebuilding a bridge, comprising: installing a shell, removing the upper structure of the existing bridge, and installing a floor slab by bridging the support portions of the steel shells. 4. A steel shell having a substantially U-shaped or box-shaped cross-section and a supporting portion on the lower bridge surface side in the axial direction on the pier or abutment on both sides of the existing bridge and having concrete filled therein. Is installed, then the upper structure of the existing bridge is removed, and then on the pier or abutment between the steel shells installed on the existing bridge at predetermined intervals and in the same direction as the steel shell, on both sides of the lower part Bridge construction characterized in that one or more steel shells having a support portion and filled with concrete are installed therein, and a floor slab is installed by bridging on a support portion of an adjacent steel shell. Replacement method. 5. A new pier or a new abutment is constructed between the piers of the existing bridge or between the pier and the abutment, and the new pier or the new abutment, or the pier or the abutment of the new pier or the new abutment and the existing bridge. A method for rebuilding a bridge, wherein the upper structure according to any one of claims 1, 2, 3, and 4 is constructed thereon.