JPH0978533A - Aseismatic reinforcing method for elevated traffic structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the construction period for the aseismatic reinforcement of an elevated traffic structure to the utmost without requiring much labor. SOLUTION: Brace means 10 are installed on pole/beam structures 5 when aseismatic reinforcement is applied to an existing elevated bridge 1 having the pole/beam structures 5 constituted of multiple poles 6 and beams 7 in a Rahmen structure and supporting a road skeleton 9 formed with the road surface 9a above on the pole/beam structures 5. The rigidity of the pole/beam structures 5 is increased by the brace means 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic retrofitting method for an elevated traffic structure suitable for seismic retrofitting an elevated traffic structure such as a reinforced concrete rigid frame viaduct.

[0002]

2. Description of the Related Art Conventionally, elevated traffic structures such as reinforced concrete ramen viaducts have been constructed. Such an elevated traffic structure has, for example, a pillar / beam structure composed of a plurality of pillars and beams forming a ramen structure in a state of being erected on the ground. A road frame having a horizontal road surface is supported by the. By the way, when an unexpectedly large earthquake occurs in such an elevated traffic structure, the pillar / beam structure is destroyed,
In order to prevent the risk of the road frame tilting or falling to the ground as much as possible, for example, the existing elevated traffic structure is reinforced at the parts of the pillar and beam structures to further improve its seismic strength. Is done in various ways. Conventional seismic reinforcement has been performed, for example, by winding a reinforcing member such as an iron plate, carbon fiber or steel rod around a pillar of a pillar / beam structure.

[0003]

However, in the above-mentioned conventional seismic reinforcement, the work of winding the reinforcement member around each pillar is a troublesome work. Further, it takes a lot of time and labor, which causes a problem that the construction period becomes long.

Therefore, in view of the above circumstances, the present invention provides a method for earthquake-proof reinforcement of an elevated traffic structure, which is capable of performing earthquake-proof reinforcement of the elevated traffic structure while reducing the work period as much as possible. To aim.

[0005]

That is, the first invention of the present invention has a pillar / beam structure (5) comprising a plurality of pillars (6) and beams (7) forming a rigid frame structure, Seismic retrofitting is performed on the existing elevated traffic structure (1), which is provided on the pillar / beam structure (5) to support the traffic frame (9) with the road surface (9a) formed on the top. At this time, metal brace means (10) is installed on the pillar / beam structure (5),
The brace means (10) is configured to increase the rigidity of the column / beam structure (5).

A second aspect of the present invention is the method for earthquake-proofing reinforcement of the elevated traffic structure (1) according to the first aspect, wherein the brace means (10) is a straight bar (12).
And the rod (1) provided in the middle of the rod (12).
2) Energy absorbing member (1
1).

A third aspect of the present invention is the method for earthquake-proofing reinforcement of an elevated traffic structure (1) according to the second aspect, wherein the energy absorbing member (11) is a steel ring (1).
1).

Note that the numbers in parentheses and the like are for convenience showing corresponding elements in the drawings, and therefore, the present description is not limited to the description on the drawings. The same applies to the following “action” column.

[0009]

According to the first aspect of the present invention having the above-described structure, the seismic retrofitting of the elevated traffic structure (1) is realized by the work of installing the brace means (10) on the pillar / beam structure (5). .

In the second aspect of the present invention, energy such as vibration generated in the column / beam structure (5) is effectively absorbed and attenuated by the energy absorbing member (11) of the brace means (10). .

In the third aspect of the present invention, the structure of the energy absorbing member (11), and hence the brace means (1)
The structure of 0) is as simple as possible.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing an example of a viaduct that has been subjected to seismic reinforcement by the seismic reinforcement method according to the present invention, and FIG.
3 is a sectional view taken along line X1-Y1 of FIG.

As shown in FIGS. 1 and 2, a viaduct 1 which is an elevated traffic structure has a reinforced concrete foundation 3 (that is, a pile or footing) buried in a ground 2. A column / beam structure 5 made of reinforced concrete is erected on the foundation 3 so as to be exposed above the ground 2. The pillar / beam structure 5 is composed of a plurality of pillars 6 that are integrally erected on the foundation 3 and a plurality of horizontal beams 7 that are integrally supported by these pillars 6. The columns 6 and the beams 7 have a predetermined rigid frame structure. Therefore, the viaduct 1 is a ramen viaduct. A predetermined road frame 9 is supported on the upper end of the pillar / beam structure 5, and a horizontal road surface 9a is formed on the road frame 9. That is, an automobile or the like can pass on the road surface 9a.

The viaduct 1 constructed as described above is subjected to the seismic retrofitting by the seismic retrofitting method according to the present invention. Therefore, as shown in FIGS. 1 and 2, the viaduct 1 has seismic retrofitting means. A plurality of metal brace means 1
0 is set. Each brace means 10 is a straight PC
The two rods 12 and 12 made of steel rods and the like are provided in a form in which these two rods 12 and 12 intersect in an X shape. One annular ring 11 made of steel, which is an energy absorbing member, is provided. That is, the ring 11 is composed of two rods 1.
At the intersecting position of the two rods 12, one rod 12 is arranged in the middle, so that the one rod 12 is connected to the ring 1.
It is divided in two with 1 in between. Also, the ring 11 is 2
Since it is located at the intersecting position of the bar members 12, 12, it is also arranged in the middle of the other bar member 12, and therefore the other bar member 12 is divided into two with the ring 11 interposed therebetween. There is. That is, the tensile stress or the like acting on each rod 12 is transmitted to the ring 11 provided in the middle of the rod 12, and when the transmitted tensile stress or the like exceeds a predetermined magnitude,
The ring 11 is plastically deformed in the extending direction of the rods 12 and can appropriately absorb energy such as tensile stress acting on each rod 12.

Although each brace means 10 is constructed as described above, each brace means 10 is installed at a portion of the viaduct 1 which is a pillar / beam structure 5, and among the pillar / beam structures 5. , Is installed between the pillars 6 that are laterally adjacent to each other. That is, each brace means 10 is installed so as to increase the rigidity of the column / beam structure 5 having a rigid frame structure. A plurality of fixing fittings 13 for installing the brace means 10 are installed on these pillars 6, and each fixing fitting 13 is provided.
Is a steel plate tubular shape that extends in the vertical direction, and is arranged so as to surround the concrete frame of each pillar 6 (note that the fixing metal fitting 13 and the pillar 6 are fixed by an anchor or the like not shown). ). Therefore, each brace means 10 is installed by connecting the four ends 12a of the two bars 12, 12 of the brace means 10 to the four fixing fittings 13 installed on the columns 6, 6 that are laterally adjacent to each other. It is carried out in the form of fixed joints.

Since the viaduct 1 and the brace means 10 and the like are constructed as described above, seismic retrofitting to the existing viaduct 1 (which has not been subjected to seismic retrofitting) is carried out as follows. First, the above-mentioned fixing fitting 13 is installed on each pillar 6 of the pillar / beam structure 5, and a plurality of brace means 10 are installed on the pillar / beam structure 5 via these fixing fittings 13.
That is, the brace means 10 enhances the rigidity of the pillar / beam structure 5 to complete the seismic reinforcement of the viaduct 1.

Viaduct 1 reinforced with earthquake resistance as described above
However, since the rigidity of the pillar / beam structure 5 is increased by the plurality of bracing means 10, it is possible to prevent the pillar / beam structure 5 from being destroyed even when a large earthquake accidentally occurs. It can be prevented as much as possible. Therefore, it is possible to prevent as much as possible the danger that the road frame 9 is inclined or falls to the ground due to the destruction of the pillar / beam structure 5. Further, as described above, energy such as tensile stress acting on each brace means 10 is appropriately absorbed by the ring 11, so that the earthquake resistance of the viaduct 1 is further improved.

In the above embodiment, the brace means 1
Although 0 is a brace means having two rods 12, a brace means having only one rod may be adopted as the brace means. Further, in the above-described embodiment, the ring 11 which is an energy absorbing member is provided in the middle of the rod 12 of the brace means 10, but a brace means in which the energy absorbing member is not provided on the rod or the like is adopted. It is possible to obtain the effect of seismic strengthening of elevated traffic structures such as viaduct 1. Further, in the above-described embodiment, the ring 11 which is a steel ring is adopted as the energy absorbing member provided in the middle of the rod 12 of the brace means 10, but various energy absorbing members other than the steel ring are used. A damper or the like can be used.

[0019]

As described above, the first aspect of the present invention is a pillar / beam structure such as a pillar / beam structure 5 composed of a plurality of pillars and beams such as a pillar 6 and a beam 7 forming a ramen structure. An existing elevated traffic structure such as a viaduct 1 which has a structure and which is provided on the pillar / beam structure to support a traffic frame such as a road frame 9 on which a traffic surface such as a road surface 9a is formed. Brace means 10 is applied to the pillar / beam structure when performing seismic reinforcement on the structure.
Brace means made of metal, etc. is installed, and the brace means enhances the rigidity of the pillar / beam structure. Therefore, according to the present invention, since the seismic retrofitting for the elevated traffic structure is realized by the work of installing the brace means on the pillar / beam structure, the pillar 1 is constructed like the conventional seismic retrofitting.
It takes less work than the work of winding a reinforcing member around one book. Also, the construction period can be shortened by the amount of time and effort required. That is, according to the present invention, the elevated traffic structure can be aseismic-reinforced with less effort and with a shortened construction period as much as possible. Further, since the metal brace means is used, it is convenient because it is not necessary to use a special member such as carbon fiber which is one of the conventionally used reinforcing members.

A second aspect of the present invention is the method for earthquake-proofing reinforcement of an elevated traffic structure according to the first aspect, wherein the brace means is a straight rod member such as a rod member 12, and the rod member. Since it is made up of an energy absorbing member such as a ring 11 which is provided on the way and is deformable in the extension direction of the rod,
Energy such as vibrations generated in the beam structure is effectively absorbed and attenuated by the energy absorbing member of the brace means. Therefore, in addition to the effect of the first invention, the earthquake resistance of the elevated traffic structure is further improved. .

A third aspect of the present invention is the structure of the energy absorbing member in the method for seismic retrofit of an elevated traffic structure according to the second aspect, wherein the energy absorbing member is a steel ring such as the ring 11. Therefore, the structure of the brace means is as simple as possible. Therefore, in addition to the effect of the second aspect of the invention, the occurrence of a failure in the energy absorbing member can be reduced as much as possible, and the members used in manufacturing the brace means can be saved as much as possible, which is convenient.

[Brief description of drawings]

FIG. 1 is a side view showing an example of a viaduct which has been subjected to seismic reinforcement by the seismic reinforcement method according to the present invention.

FIG. 2 is a sectional view taken along line X1-Y1 of FIG. 1;

[Explanation of symbols]

 1 ... Elevated traffic structure (viaduct) 5 ... Pillar / beam structure 6 ... Pillar 7 ... Beam 9 ... Passage frame (road frame) 9a ... Passage road surface (road surface) 10 ... Brace means 11 ... Energy absorbing member, steel ring 12 ... Bar material

Claims (3)

[Claims] 1. A column / beam structure comprising a plurality of columns and beams forming a ramen structure, and a supporting structure having a passageway surface formed thereon is supported on the column / beam structure. When seismic retrofitting is applied to an existing elevated traffic structure, metal bracing means is installed on the pillar / beam structure, and the rigidity of the pillar / beam structure is increased by the bracing means. Seismic retrofitting method for constructed elevated traffic structures. 2. The brace means comprises a straight rod and an energy absorbing member provided in the middle of the rod and deformable in the extending direction of the rod. Seismic retrofitting method for elevated traffic structures. 3. The seismic retrofitting method for an elevated traffic structure according to claim 2, wherein the energy absorbing member is a steel ring.