JP4001058B2 - Seismic reinforcement method for wall structures - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seismic reinforcement method for a wall structure, for example.
[0002]
[Prior art]
One of the methods for seismic reinforcement of existing wall structures such as reinforced concrete wall-type piers and abutments, PC steel bars that are inserted through a plurality of perforations that open through the thickness direction of the existing wall structure, and A plate-like body having an arcuate cross section, and having a shell steel plate integrally provided with a connecting flange on both sides in the width direction of the arc, and the wall structure The outer steel plate is fixed to the wall surface by screwing the flange penetration end of the PC steel rod, and then the arc-shaped space between the outer steel plate and the wall surface is installed. There is a construction method in which concrete is cast in the cut-off portion to be configured and integrated with the wall surface of the wall structure (Patent Document 1).
[0003]
In this construction method, the restraining force of the PC steel bar is uniformly transmitted to the wall surface through the flange, and the outer shell steel plate is curved, so the lateral restraint effect is high. In addition to eliminating the need for a formwork, it has features such as a new appearance in design.
[0004]
[Patent Document 1]
JP-A-9-209580 [0005]
[Problems to be solved by the invention]
However, in this construction method, since the outer surface is a steel plate, rust-proof coating must be applied periodically, and maintenance after the construction is troublesome. In addition, when the inspection is performed after the earthquake, the surface is covered with a steel plate, so that there is a problem that it is difficult to understand at first glance of properties such as cracks in concrete.
[0006]
The present invention solves the above-mentioned problems, and its purpose is to make it possible to easily observe properties after an earthquake without having to paint after construction while enjoying the advantages of the curved surface shape described above. A seismic reinforcement method for wall structures is provided.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the construction method of the present invention is a plate-like body that is installed on the wall surface of an existing wall structure and the surface has an arch shape in cross section, and connecting flanges are integrally formed on both sides of the arch shape in the width direction. Provided with a concrete reinforcing wall in which a tensile material having a span corresponding to the curved surface of the arch is embedded, and through holes are formed in the existing wall structure in advance. The reinforcing wall is fixed to the existing wall structure by inserting a bar through the flange of the reinforcing wall and the through hole of the wall structure and fixing the protruding ends on both sides of the bar.
[0008]
Therefore, in the present invention, the tensile material embedded in the concrete reinforcing wall has a high lateral restraint effect similar to that of the steel plate, and after the construction there is no need for painting, and the maintenance is excellent. In addition, when a crack occurs after an earthquake, it can be easily visually determined from the outside, and diagnosis after the earthquake is easy.
[0009]
In the present invention, the reinforcing wall is preferably made of precast concrete, and in this case, the construction period required for the seismic reinforcement can be shortened.
[0010]
In the construction method of the present invention, the back surface of the reinforcing wall may have a flat surface corresponding to the wall surface of the existing structure, and may be in close contact with the wall surface in the installed state, or the back surface of the reinforcing wall may have an arc shape. In the installed state, mortar or concrete can be placed on the arc-shaped paragraph formed between the back surface of the reinforcing wall and the wall surface, and can be integrated with the wall surface. Can be used as a frame.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 to 3 show a first embodiment of the present invention.
[0012]
1 and 2, reference numeral 1 denotes a bridge pier standing on an abutment (not shown), and 2 denotes a reinforcing wall made of, for example, PCa (precast concrete, hereinafter abbreviated as PCa) installed on the front and rear surfaces of the pier 1.
[0013]
An appropriate number of reinforcing walls 2 corresponding to the width and height of the pier 1 are arranged. In this embodiment, two reinforcing walls 2 are arranged in the width direction and plural in the height direction.
[0014]
A main body 3 composed of a columnar plate-like body having a surface of each reinforcing wall 2 formed in an arch shape in plan view and a back surface formed in a plane (straight cross section) along the surface shape of the pier 1; It consists of flanges 4 and 5 integrated on both sides of the part 3 and a tension member 6 embedded in the body part 3 and arranged with a span along the surface shape of the arch-shaped overhang. .
[0015]
The tension member 6 is made of a reinforcing bar or the like, and both ends thereof are anchored in the concrete by bending the ends into flanges at the positions of the flanges 4 and 5. The tension member 6 is composed of a plurality of vertical bars 7. It is integrated with the main body 3 in a state of being connected in multiple stages.
[0016]
For example, in the present embodiment, a PC steel rod 9 as an example of a bar is inserted into one flange 4 arranged on the edge side of the pier 1 among the flanges 4 and 5 via a connecting plate 8. A pair of upper and lower through-holes 4a are formed, and the other flange 5 is non-holed, and the PC steel rod 9 is interposed by a common clamping plate 10 that is mounted between adjacent flanges 5. It is fixed to the pier 1 In addition, the through-hole for inserting a PC steel rod can also be formed in the flanges 5 and 5 on the side that is not the end edge side of the pier 1.
[0017]
Next, the work procedure of seismic reinforcement using the PCa reinforcing wall 2 having the above configuration will be described. Prior to the attachment of the reinforcing wall 2, as shown in FIG. 3A, a plurality of mounting holes are formed at positions where they penetrate through both attachment surfaces of the pier 1 and align with the through holes formed in the reinforcing wall 2 by drilling. 1a is formed, and the mounting surface is roughened by a lifting operation or the like.
[0018]
Next, as shown in FIG. 3 (b), the reinforcing wall 2 is suspended by a crane or the like, and installed in pairs on both sides of the pier 1 in order from the bottom.
[0019]
Then, as shown in FIG. 2, the PC steel rod 9 is inserted through the fastening plate 10 at the center side, and the PC steel rod 9 is inserted through the connecting plate 8 at the edge side. By introducing a post tension to the projecting ends of both sides by tightening nuts, each reinforcing wall 2 can be firmly fixed to the pier 1 and at the same time an active restraining effect can be obtained.
[0020]
Further, when the reinforcing wall 2 is installed, an adhesive material such as a mortar 11 is applied between the back surface of the reinforcing wall 2 and the mounting surface of the pier 1 as shown in an enlarged circle in FIG. Glue.
[0021]
By repeating the above operations in order from the lower side toward the upper side, as shown in FIG. 3C, an earthquake-resistant reinforcing wall in which a plurality of reinforcing walls 2 are fixed to the front and back surfaces of the pier 1 can be completed.
[0022]
In the above embodiment, the length of each of the plates 8 and 10 is adjusted to the height of each reinforcing wall 2, but the plates 8 and 10 can be arranged in a state shifted in the height direction. .10 can be attached to each PC steel bar 9 as a washer.
[0023]
FIG. 4 shows a second embodiment of the present invention. In the figure, the same portions as those in the above embodiment are denoted by the same reference numerals, and the description thereof will be omitted. Only different portions will be described using different reference numerals.
[0024]
The reinforcing wall 20 in the figure is the same as that of the first embodiment except that the main body portion 21 embeds the tensile material 6 integrally and the back surface is also arched, as shown in FIG. After attaching the reinforcing wall 20 to the wall surface of the pier 1 in the same manner as in the above embodiment, as shown in (b), in the gap (paragraphed portion) formed between the back surface of the reinforcing wall 2 and the pier 1. By placing mortar or concrete 22, the pier 1 and the reinforcing wall 2 can be joined together.
[0025]
In addition, if a reinforcing bar is built in advance at this placement position, the toughness of the structure itself is further improved.
[0026]
Further, in each of the above-described embodiments, the PCa-made one is used as the reinforcing wall 2. However, a part or all of the reinforcing wall 2 can be constructed by on-site construction in which concrete is placed on-site.
[0027]
Moreover, in each embodiment, although the PC steel bar 9 was used as a bar, it can be replaced with one made of carbon fiber and aramid fiber, and as the tension member 6 integrated inside the reinforcing wall 2 Reinforcing bars are used, but new materials such as PC strands can also be used.
[0028]
Furthermore, in each embodiment, although the case where the construction method of this invention was applied to the pier was shown, it is needless to say that it can apply to the existing earthquake resistance reinforcement method of the existing abutment and other independent wall structures.
[0029]
【The invention's effect】
As is apparent from the above description, according to the seismic reinforcement method for wall structures according to the present invention, painting after construction is unnecessary and property observation after an earthquake can be easily performed while enjoying the advantages of a curved surface shape. be able to.
[Brief description of the drawings]
FIG. 1 is a plan sectional view including a partially enlarged portion showing a structure for attaching a reinforcing wall to a pier according to a first embodiment of the present invention.
FIG. 2 is an exploded perspective view of the mounting structure.
FIGS. 3A to 3C are perspective views showing a construction procedure and a completed state.
FIGS. 4A and 4B are plan sectional views showing a second embodiment. FIG.
[Explanation of symbols]
1 Pier (existing wall structure)
2,20 PCa reinforcing wall 3,21 Main body (plate)
4, 5 Flange 6 Tensile material 9 PC steel bar (bar material)
22 Mortar or concrete

Claims (4)

A plate-like body that is installed on the wall surface of an existing wall structure and the surface has an arched cross-section, with connecting flanges integrally provided on both sides of the arch-shaped width direction, and a span corresponding to the curved surface of the arch inside Using a concrete reinforcing wall that is embedded with a tensile material of
A through-hole is formed in the existing wall structure in advance, and a bar is inserted into the flange of the reinforcing wall and the through-hole of the wall structure in the installed state of the reinforcing wall, and both protruding ends of the bar are fixed. Then, the said wall is fixed to the existing wall structure, The earthquake-proof reinforcement construction method of the wall structure characterized by the above-mentioned. 2. The seismic reinforcement method for a wall structure according to claim 1, wherein the reinforcing wall is made of precast concrete. 3. The seismic reinforcement method for a wall structure according to claim 1 or 2, wherein the back surface of the reinforcing wall forms a flat surface corresponding to the wall surface of the existing structure and is in close contact with the wall surface in an installed state. 3. The mortar or concrete according to claim 1 or 2, wherein a back surface of the reinforcing wall is formed in an arch shape, and an arc-shaped step portion formed between the back surface of the reinforcing wall and the wall surface in the installed state of the reinforcing wall. A seismic reinforcement method for wall structures, which is characterized by placing a wall and integrating it with the wall surface.

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