JPH0978534A - Aseismatic reinforcing method for concrete pole structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently improve the strength of a concrete pole structure. SOLUTION: When aseismatic reinforcement is applied to an existing concrete pole structure 1 having a pole 5, multiple steel sheets 10 provided with bulge preventing members 11 on faces 10a are arranged around the pole 5 so that the bulge preventing members 11 of the steel sheets 10 face the pole 5, and a cylindrical reinforcing steel sheet frame body 9 is installed around the pole 5. Concrete is placed and filled between the reinforcing steel sheet frame body 9 and the pole 5 to bury the bulge preventing members 11, the placed concrete is hardened, and the pole 5 is reinforced by the reinforcing steel sheet frame body 9 and the placed concrete.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic reinforcement method for a concrete column structure, which is suitable for seismic reinforcement of a concrete column structure having columns made of reinforced concrete.

[0002]

2. Description of the Related Art FIG. 7 is a side view showing a state in which seismic reinforcement of a concrete column structure is performed by a conventional seismic reinforcement method, and FIG. FIG. 9 is a side sectional view showing a state in which concrete is placed in between, and FIG. 9 is a side sectional view showing a state in which the entrapment prevention member shown in FIG. 8 is removed.

Conventionally, a concrete column structure having columns made of reinforced concrete, such as a ramen viaduct composed of a plurality of columns and beams made of reinforced concrete, has been constructed. By the way, when a large earthquake occurs carelessly, the columns of such concrete column structures are destroyed, and for example, the road frame supported on these columns may tilt or fall to the ground. In order to prevent such dangers as much as possible, existing concrete column structures are reinforced by various methods to strengthen their aseismic strength.

As one of conventional seismic reinforcement methods, there is a reinforcement method using an iron plate. That is, in this reinforcing method, as shown in FIGS. 7 and 8, first, a plurality of iron plates 50 are provided so as to surround the pillars 5 of the concrete pillar structure 1, so that the cylindrical reinforcing iron plate frame body 55 is formed. It is installed around the pillar 5. Next, around the outside of the installed reinforcing iron plate frame 55, the entrapment prevention member 52 such as a square member is installed, and concrete 60 is placed between the reinforcing iron plate frame 55 and the pillar 5. After the cast concrete 60 is solidified and the reinforcing iron plate frame 55 is fixed to the pillar 5 by the concrete 60, the entrainment prevention member 52 is removed from the reinforcing iron plate frame 55 as shown in FIG. Completed the seismic reinforcement of the concrete pillar structure 1. That is, the pillar 5 is reinforced by the reinforcing iron plate frame body 55.

[0005]

By the way, the reinforcing iron plate frame 5 is caused by the flow pressure of the concrete 60 poured and filled.
The stress in the direction of arrow A in the drawing, which is the direction away from the pillar 5, acts on each iron plate 50 that constitutes the element 5. As described above, the anti-separation member 52 prevents the iron plate 50 from being entrapped due to the stress of the flow pressure in the direction of arrow A as much as possible, but the part of the iron plate 50 to which the anti-separation member 52 does not directly contact. As shown in FIG. 8, the iron plate 50 is bent and deformed in the arrow A direction at 50a (that is, the portion corresponding to the space between the vertically adjacent entrainment prevention members 52, 52). Therefore, when the cast concrete 60 is solidified and the entrainment prevention member 52 is removed from each iron plate 50, the entrainment prevention member 52 of the iron plate 50 is restored by the restoring force of the curved iron plate 50. The portion 50b that was directly in contact with the member moves in the direction of arrow A and is deformed. By this deformation, between the solidified concrete 60 and the iron plate 50,
Therefore, a gap 61 was generated between the pillar 5 and the reinforcing iron plate frame 55. This void 61 becomes a factor that reduces the strength of the column 5 after reinforcement. Thus, it is difficult to efficiently improve the strength of the concrete pillar structure 1 because the void 61 is formed between the reinforcing iron plate frame body 55 which is the reinforcing member and the pillar 5.

In view of the above circumstances, an object of the present invention is to provide a method for earthquake-proof reinforcement of a concrete column structure which can efficiently improve the strength of the concrete column structure.

[0007]

[Means for Solving the Problems] That is, the first aspect of the present invention is to use one side (10a) for seismic reinforcement of an existing concrete column structure (1) having a concrete column (5). A plurality of metal reinforcing plate members (10) provided with a scatter preventing member (11) are formed in a form surrounding the concrete pillar (5), and the scatter preventing member (11) of each of the reinforcing plate members (10). Is installed in a shape facing the concrete pillar (5), a cylindrical reinforcing frame body (9) is installed around the concrete pillar (5), and the reinforcing frame body (9) and the concrete pillar (9) are installed. 5), the anti-separation member (11) is embedded in the concrete (2).
0) is poured and filled, the poured and filled concrete (20) is solidified, and the concrete pillar (5) is made by the reinforcing frame (9) and the cast and filled concrete (20). ) Is configured to reinforce.

A second aspect of the present invention is the method for earthquake-proofing reinforcement of a concrete pillar structure according to the first aspect, wherein the inner periphery of the reinforcing frame body (9) is provided when the reinforcing frame body (9) is installed. Concrete (20) is provided on the surface (9a) between the reinforcing plate members (10, 10) adjacent to each other.
A concrete flow passage (12) through which the water can flow is formed vertically, and when the concrete (20) is poured and filled, it is between the reinforcing frame (9) and the concrete column (5). The cast concrete (20) was made to circulate vertically along the concrete flow passage (12).

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

[0010]

According to the first aspect of the present invention having the above-mentioned structure, the anti-scattering member (11) is buried in the concrete (20) between the reinforcing frame (9) and the concrete column (5) to form the concrete. The sticking prevention member (11) is not removed after the solidification of (20).

According to a second aspect of the present invention, the concrete (2) is added when the concrete (20) is poured and filled.
0) vertical flow is through the concrete flow passage (12)
It is done along.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing a state where seismic reinforcement of a concrete column structure is performed by the seismic reinforcement method of the present invention,
2 is a detailed view showing a side cross section of a pillar and an iron plate of the concrete pillar structure shown in FIG. 1, and FIG. 3 is a side showing a state where concrete is placed between the pillar and the iron plate shown in FIG. Cross section,
FIG. 4 is a perspective view showing the inside of the reinforcing iron plate frame body in FIG. 1, and FIG. 5 is a perspective view showing the inside of the reinforcing iron plate frame body formed in a different form from the reinforcing iron plate frame body shown in FIG. FIG. 6 and FIG. 6 are perspective views showing the inside of a reinforcing iron plate frame body configured in a different form from the reinforcing iron plate frame body shown in FIG.

As shown in FIG. 1, a concrete column structure 1 which is a rigid frame viaduct is made of reinforced concrete erected on a foundation (not shown) which is embedded and constructed in the ground 2 (that is, made of piles and footings). Pillar and beam structure 3
The pillar / beam structure 3 has a plurality of pillars 5 (only one is shown in FIG. 1) that are integrally erected on the foundation (not shown), and these pillars 5 are integrated with each other. It is composed of a plurality of horizontal beams 6 supported by. In addition, these pillars 5
And the beam 6 has a predetermined rigid frame structure. Further, on the upper end of the pillar / beam structure 3, a predetermined road frame body 7 having a horizontal road surface (not shown) on which an automobile or the like can pass is supported on the upper side.

A plurality of iron plates 10 are used to perform seismic retrofitting on the existing concrete pillar structure 1 constructed as described above by the seismic retrofitting method according to the present invention. That is, as shown in FIGS. 2 and 4, each iron plate 10 has a plate main body 15 formed in a flat plate shape, and the surface 10a, which is one surface of the plate main body 15, is formed along the surface 10a. A plurality of anti-seizure members 11 made of a channel member or the like that is linearly extended are provided so as to be joined in parallel at a predetermined interval. Therefore, in order to perform the seismic reinforcement of the concrete pillar structure 1 using these iron plates 10, first, each pillar 5 of the pillar / beam structure 3 of the concrete pillar structure 1 is shown in FIGS. 1 and 2. As described above, the plurality of iron plates 10 are provided so as to surround each of the columns 5 and the entrainment prevention member 11 of each of the iron plates 10 faces the columns, so that the tubular reinforcing iron plate frame body 9 is formed.
Are installed around each pillar 5. At this time, one reinforcing iron plate frame 9 is provided with four iron plates 1 as shown in FIGS. 1 and 4.
These four iron plates 10 are arranged in a state in which the entrapment prevention member 11 of each reinforcing iron plate frame 9 extends in the horizontal direction. Further, between the adjacent iron plates 10 and 10, as shown in FIG. 4, the arrangement positions of the respective entrapment prevention members 11 are vertically staggered. That is,
On the inner peripheral surface 9a of each reinforcing iron plate frame 9, concrete is not hindered by the plurality of entrainment prevention members 11 between the adjacent iron plates 10 and 10, and arrows P and Q in FIG.
Concrete flow passage 12 that can flow smoothly in the direction
Is formed over the top and bottom.

Next, the reinforced iron plate frame body 9 and the pillars 5 installed.
In the concrete pouring space 21 between the reinforcing iron plate frame 9
Concrete 20 is poured and filled in such a manner that the encrusting prevention member 11 inside is buried. When the concrete 20 is poured and filled, the concrete 20 cast between the reinforcing iron plate frame 9 and the pillars 5 is shown in FIG. 4 along the concrete flow passage 12 of the reinforcing iron plate frame 9. As described above, the liquid is circulated vertically in the directions of arrows P and Q. Therefore, concrete 2
The vertical flow of 0 is smoothly performed along the concrete flow passage 12 without being hindered by the entrainment prevention member 11. By the way, concrete pouring space 2
As shown in FIG. 3, the iron plate 10 of the reinforcing iron plate frame 9 is moved in the direction indicated by arrow A in the drawing, which is a direction away from the pillar 5, due to the flow pressure of the concrete 20 generated by pouring and filling the concrete 20 into the steel plate 1. Is applied. As described above, the entrapping prevention member 11 is provided on the inner surface 10a of the iron plate 10.
Since the iron plate 10 is installed, it is possible to prevent the iron plate 10 from being caught by the stress in the direction of the arrow A as much as possible.
0, the portion 10b to which the anti-separation member 11 is not directly joined (ie, the anti-separation member 1 vertically adjacent to each other).
3, the iron plate 10 is curved and deformed in the direction of arrow A to be in a squeezed state, and a portion 10c in which the entrainment prevention member 11 is directly joined is shown in FIG. Then, since the rigidity is increased by the entrapment prevention member 11, the encircling state is maintained.

Thereafter, the poured and filled concrete 20 is solidified. Due to the solidification, the reinforcing iron plate frame body 9 is fixed to the pillar 5 through the concrete 20. That is, the columns 5 are reinforced by the reinforcing iron plate frame body 9, and the reinforcement of the columns 5 completes the seismic reinforcement of the concrete column structure 1. Since the entrainment prevention member 11 is buried in the concrete 20 between the reinforcing iron plate frame 9 and the pillar 5, it is not necessary to remove the entrainment prevention member 11 after the concrete 20 is solidified.
Therefore, as described above, the restoring force of the iron plate 10 is released by the bending deformation of the portion 10b and the like, and the iron plate 10 does not move or deform in the arrow A direction or the like. That is, after the concrete 20 is solidified, the iron plate 10
Is prevented from moving or deforming to form a gap between the solidified concrete 20 and the iron plate 10, that is, between the pillar 5 and the reinforcing iron plate frame 9. As described above, since the void is prevented from being formed between the reinforcing iron plate frame body 9 which is the reinforcing member and the pillar 5, the strength of the concrete pillar structure 1 can be efficiently improved.

In the embodiment described above, the reinforcing iron plate frame body 9 which is a reinforcing frame body is arranged so that the disposition positions of the entrapment preventing members 11 are vertically staggered between the adjacent iron plates 10 and 10. A concrete flow passage 12 through which concrete can flow is formed vertically so as to utilize the gap between the staggering prevention members 11 which are staggered. However, the mode in which the concrete flow path is formed in the reinforcing frame is not limited to the one shown in the above-mentioned embodiment.

For example, in the reinforcing iron plate frame body 9 shown in FIG.
Horizontal entrainment prevention member 1 between adjacent iron plates 10 and 10.
1 and 11 are correspondingly connected. That is, the entrainment prevention members 1 of the same height level in the four iron plates 10
1, that is, the four ring preventing members 11 make the horizontal ring W
Are formed. That is, the inner peripheral surface 9a of the reinforcing iron plate frame 9
On the side, a plurality of ring bodies W are formed in upper and lower layers. A notch K is provided in at least one place of the ring W. Note that the notches K, K are not arranged at positions corresponding to each other between the vertically adjacent ring bodies W, W. That is, on the inner peripheral surface 9a of the reinforcing iron plate frame 9, concrete is used between the iron plates 10 and 10 adjacent to each other in the form of utilizing the notch K of each ring W, as shown in FIG.
Concrete flow passage 12 that can flow in the directions P and Q
Is formed over the top and bottom.

Further, for example, in the reinforced iron plate frame body 9 shown in FIG. 6, all the entrapment preventing members 11 are arranged in a form inclined at a constant inclination angle α. Further, between the adjacent iron plates 10 and 10, the respective entrapment prevention members 11 and 11 are connected in correspondence with each other. That is, on the inner peripheral surface 9a side of the reinforcing iron plate frame body 9, one spiral body R formed by connecting a plurality of entrainment prevention members 11 inclined at the inclination angle α is formed. That is, on the inner peripheral surface 9a of the reinforced iron plate frame body 9, between the iron plates 10 and 10 adjacent to each other, the concrete extends along the spiral R and between the upper and lower entrainment prevention members 11 and 11 is indicated by arrows P and Q in FIG. A concrete flow passage 12 that can flow in the direction is formed vertically.

[0020]

As described above, the first aspect of the present invention is, when performing seismic reinforcement on an existing concrete column structure such as a concrete column structure 1 having concrete columns such as columns 5, A plurality of metallic reinforcing plate members, such as an iron plate 10, having anti-encrusting members such as the anti-encrusting member 11 provided on one surface such as the surface 10a, in a form surrounding the concrete columns, and preventing entangling of each of the reinforcing plate members By providing a member facing the concrete pillar, a tubular reinforcing frame body such as a reinforcing iron plate frame body 9 is installed around the concrete pillar, and between the reinforcing frame body and the concrete pillar, the Concrete such as concrete 20 is poured and filled in such a manner that the anti-separation member is buried, and the filled and filled concrete is solidified to form the reinforcing frame and the filled and filled concrete. The configured so as to reinforce said concrete column. Therefore, at the time of pouring and filling the concrete, the stress in the direction away from the concrete column (that is, the direction of arrow A in the figure) is applied to each reinforcing plate member constituting the reinforcing frame by the flow pressure of the concrete poured and filled. To work. Due to the stress, each reinforcing plate member is bent and deformed at the portion 10b where the anti-separation member is not directly provided, and the rigidity is increased by the anti-separation member at the portion 10c where the anti-separation member is directly provided. Don't worry about it. However, since the entrainment prevention member is buried in the concrete between the reinforcing frame and the concrete column, it is not necessary to remove the entrainment prevention member after the concrete is hardened. Therefore, due to the bending deformation, the restoring force of the reinforcing plate member is not released, and the reinforcing plate member does not move or deform. That is, it is possible to prevent the reinforcing plate member from moving or deforming after the solidification of the concrete, thereby forming a gap between the solidified concrete and the reinforcing plate member, that is, between the concrete column and the reinforcing frame. As described above, since the void is prevented from being formed between the reinforcing frame body which is the reinforcing member and the concrete column, the strength of the concrete column structure can be efficiently improved. Further, since the inner peripheral surface 9a side of the reinforcing frame is made uneven by the anti-separation member, the fixation between the concrete between the concrete column and the reinforcing frame and the reinforcing frame does not occur. The unevenness due to the prevention member is effective. Further, since the anti-separation member is buried in the cast concrete, the anti-separation member cannot be seen from the outside after completion of the seismic reinforcement, which is convenient in terms of aesthetics.

A second aspect of the present invention is the method for earthquake-proofing reinforcement of a concrete column structure according to the first aspect, wherein the inner peripheral surface of the inner peripheral surface 9a of the reinforcing frame is installed when the reinforcing frame is installed. On the surface, between the reinforcing plate members adjacent to each other, a concrete flow passage such as a concrete flow passage 12 through which concrete can flow is formed vertically.
At the time of placing and filling the concrete, the concrete that is placed between the reinforcing frame and the concrete column,
It was made to circulate vertically along the concrete flow passage. Therefore, in addition to the effect of the first invention, in the case of concrete pouring and filling, the vertical flow of the concrete is smoothly performed along the concrete flow passage without being hindered by the entrainment prevention member. It is possible to prevent the formation of voids between the cast concrete and the reinforcing frame as much as possible, and the strength of the concrete column structure can be improved more efficiently.

[Brief description of drawings]

FIG. 1 is a side view showing a state where seismic retrofitting of a concrete column structure is performed by the seismic retrofitting method of the present invention.

FIG. 2 is a detailed view showing a side cross section of a pillar and an iron plate of the concrete pillar structure shown in FIG.

FIG. 3 is a side sectional view showing a state where concrete is placed between the pillar and the iron plate shown in FIG.

FIG. 4 is a perspective view showing the inside of a reinforced iron plate frame body in FIG. 1.

FIG. 5 is a perspective view showing the inside of a reinforcing iron plate frame body formed in a shape different from that of the reinforcing iron plate frame body shown in FIG. 1.

FIG. 6 is a perspective view showing the inside of a reinforcing iron plate frame body configured in a different form from the reinforcing iron plate frame body shown in FIG. 1.

FIG. 7 is a side view showing a state where seismic retrofitting of a concrete column structure is performed by a conventional seismic retrofitting method.

8 is a side cross-sectional view showing a state in which concrete is placed between the pillar and the iron plate of the concrete pillar structure shown in FIG.

9 is a side sectional view showing a state in which the entrapment prevention member shown in FIG. 8 has been removed.

[Explanation of symbols]

 1 ... Concrete pillar structure 5 ... Concrete pillar (pillar) 9 ... Reinforcing frame body (reinforcing iron plate frame body) 9a ... Inner peripheral surface 10 ... Reinforcing plate member (iron plate) 10a ... One side (surface) 11 …… Separation prevention member 12 …… Concrete flow passage 20 …… Concrete

Claims (2)

[Claims] 1. When performing seismic retrofitting on an existing concrete column structure having concrete columns, a plurality of metal reinforcing plate members provided with a clinch preventing member on one surface are provided in a form surrounding the concrete columns. And, by providing the entrainment prevention member of each of the reinforcing plate members so as to face the concrete pillar, a cylindrical reinforcing frame body is installed around the concrete pillar, and between the reinforcing frame body and the concrete pillar. In, the concrete is poured and filled in such a manner that the anti-scattering member is buried, and the filled and filled concrete is solidified, and the concrete frame is filled with the reinforcing frame and the filled and filled concrete. Seismic retrofitting method for concrete column structure constructed to reinforce. 2. When the reinforcing frame is installed, an inner peripheral surface of the reinforcing frame is provided between the reinforcing plate members adjacent to each other.
A concrete flow passage through which concrete can flow is formed vertically, and at the time of placing and filling the concrete, concrete that is placed between the reinforcing frame and the concrete columns is
The seismic retrofitting method for a concrete column structure according to claim 1, wherein the concrete column structure is circulated vertically along the concrete flow passage.