JP5809487B2 - Column structure and column reinforcement method - Google Patents

Description

  The present invention relates to a column structure for protecting a column and its foundation from a large-scale earthquake and a reinforcing method thereof.

  Many electric poles have been damaged by the Tohoku Earthquake. In order not to break the electrification pillars for a large-scale earthquake like this time, it is necessary to upgrade to seismic reinforcement or replace with steel pipe pillars.

As the seismic reinforcement of electric poles, for example, techniques disclosed in Patent Document 1 and Patent Document 2 are known.
The seismic reinforcement structure for a utility pole shown in Patent Document 1 surrounds the outer periphery of the utility pole with a cylindrical body having an inner diameter larger than the outer diameter of the utility pole, and a reinforcing filler is provided in the gap between the cylindrical body and the utility pole. Is formed by dividing the cylindrical body into at least two cylindrical constituent members in the circumferential direction, and fixing the cylindrical constituent members to each other with a fastening member such as a bolt. The structure forming the body is shown.

  In the concrete electric pole shown in Patent Literature 2, at least one layer is wound around the surface of the reinforced concrete column whose strength has been deteriorated so that the reinforcing fiber sheet is arranged in the axial direction and the circumferential direction of the reinforcing fiber, A reinforcing structure made of a fiber reinforced plastic is shown by winding a reinforcing fiber sheet of insulating fibers on the outermost layer and curing the matrix resin impregnated in the reinforcing fiber before or after winding the sheet.

JP 2005-336746 A JP-A-5-332032

  However, in the techniques disclosed in Patent Documents 1 and 2, the strength of the electrified pillars is increased and seismic reinforcement is possible. However, if a large-scale earthquake occurs that exceeds the seismic strength, The foundation supporting the column body will also be uprooted and fall, making subsequent repair work more difficult.

  The present invention has been made in view of the circumstances described above, and in the event of a large-scale earthquake, the energy of an earthquake that causes the column to fall is prevented from being transmitted to the foundation that supports the column. In addition, the structure of the column body and the method of reinforcing the column body that can protect the foundation and also prevent damage to the column body from falling down completely are provided.

In order to solve the above problems, the present invention proposes the following means.
The present invention is a hollow columnar structure embedded in a foundation from a lower end over a predetermined length and having a plurality of reinforcing wires continuously arranged in the length direction. A reinforcing body surrounding the outer periphery of the column body is provided at a position, and a portion of the column body surrounded by the reinforcing body is provided with a portion having a lower strength than other portions , and a space between the column body and the reinforcing body is provided . A first filler is provided, a second filler is filled in a lower portion of the internal space of the column body, and the second filler is filled to a position above the first filler. And

Further, the present invention is a method for reinforcing a hollow column body in which a plurality of reinforcing wire rods embedded in a foundation from a lower end over a predetermined length and arranged in a length direction are disposed inside the column. and intensity adjusting step underlying the vicinity of the body to form a small portion of strength than the other portions, the reinforcing member placing step of providing a reinforcing member so as to surround the outer periphery of the cylindrical body, between the reinforcing member and the columnar body have a, a filling material injection step of filling the first sealing member in the space, a small portion of the strength, characterized in that it is formed by cutting a part or all of the reinforcing wire member vertically .

According to the present invention, in the upper part of the foundation, the reinforcing body surrounding the outer periphery of the column body is provided, and the column body surrounded by the reinforcing body is provided with a portion having a lower strength than the other portions. When a large-scale earthquake occurs, first, the column having a low strength is damaged to make the column easy to tilt. The column body at this time is supported by a reinforcing body that surrounds the outer periphery of the column body, and when the first filler is provided in the space between the column body and the reinforcing body, the column body Is supported by the first filler injected into the space between the reinforcing body and the seismic energy acting on the column body by absorbing the reinforcing body by plastic deformation. Prevents the column from falling from the foundation.
That is, the present invention protects the foundation of the column by actively reducing the bending strength of the column near the base and absorbing the earthquake force applied to the column by plastic deformation of the reinforcement. Is possible.

  Further, in the present invention, for example, by forming the portion having a low strength of the column by dividing the reinforcing wire in the column vertically, as described above, the bending strength of the column near the base can be increased. It is possible to protect the foundation of the column body by actively dropping and absorbing the earthquake force applied to the column body by plastic deformation of the reinforcing body.

  Moreover, in this invention, about the part with the said low intensity | strength, the synthetic | combination bending strength of the column body of the said part, a reinforcement body, and a filler is set so that it may become smaller than the bending strength of the other part of the said column. Therefore, when a large-scale earthquake occurs, the column body can be reliably tilted at a portion where the strength is small, and the seismic energy acting on the column body is supplied to the reinforcing body and the first filling described above. Can be received with materials.

  Moreover, in this invention, a 2nd filler is provided in the lower part of the internal space of a hollow column. For example, by filling the second filler up to a position above the first filler, the change in the cross section including the column 1 and the surrounding reinforcing material and the first filler is made stepwise. , Stress concentration on a part of the column 1 can be prevented.

  Further, in the present invention, a strength adjusting step for forming a portion having lower strength than other portions in the vicinity of the foundation of the column body, and a reinforcing body is provided so as to surround the outer periphery of the column body of the lower strength portion on the foundation. By sequentially performing the reinforcing body installation process and the filler injection process of filling the space between the pillar body and the reinforcing body with the first filler, the above-described foundation for the existing pillar body is obtained. It is possible to obtain a columnar structure that can protect and prevent the column body from falling down completely, and can be a countermeasure against a large-scale earthquake.

It is a perspective view showing one embodiment of the pillar structure concerning the present invention. It is a front sectional view showing a viaduct where a column is installed. FIG. 3 is a plan view of FIG. 2. It is sectional drawing cut | disconnected along the IV-IV line of FIG. It is sectional drawing which cut | disconnected FIG. 1 along the VV line. It is a front view which shows the reinforcing wire in a pillar. (A) The figure which shows the column body before a large-scale earthquake occurrence, (B) The figure which shows the state which the column body inclined by the large-scale earthquake.

An embodiment of the present invention will be described with reference to FIGS.
FIG. 1 shows a columnar structure according to the present embodiment, and reference numeral 1 denotes a columnar body to be reinforced. As shown in FIGS. 2 to 4, the column body 1 is supported by a foundation B provided on a viaduct 2 of a railway.

  The column 1 and its foundation B are provided along the side wall 3 of the viaduct 2 and both are formed of reinforced concrete. Further, in the vicinity of the foundation B, a height 4 that is a part of the side wall 3 is provided.

The column 1 has a hollow structure in which a plurality of reinforcing wires 10 are embedded in the foundation B over a predetermined length from the lower end and are continuously provided in the length direction.
As shown in FIGS. 5 and 6, the reinforcing wire 10 shows an example in which the steel material 11 along the length direction of the column 1 and the spiral steel material 12 are arranged so as to cross and connect with each other. However, the present invention is not limited to this, and various types of structures can be used.

  A reinforcing body 13 is provided around the column body 1. The reinforcing body 13 is made of, for example, a fibrous material such as a steel plate, a net-like body knitted with steel wire or a carbon fiber sheet, a fiber-reinforced plastic sheet, and the like, as shown in FIG. It is provided in the vicinity of the foundation B so as to cover the column body 1 from the periphery. In addition, the reinforcing body 13 may be formed by arranging and connecting steel rods at regular intervals around the column body and along the length direction. Further, the reinforcing body 13 may be configured by wrapping the periphery of the column 1 after arranging steel rods in a lattice shape.

  A filler 14 (first filler) for bringing the reinforcing body 13 into close contact with the outer peripheral surface of the column 1 is injected into the space between the column 1 and the reinforcing body 13. In addition, as this filler 14, when the reinforcement body 13 is formed with a steel plate, a non-shrink mortar having good adhesion to the steel plate is used, and a plastic material such as an epoxy resin or an acrylic resin is also used. .

Filler 15 (second filler) is also injected into the hollow portion 1A, which is the internal space of the column 1. The filler 15 is formed of the same material as the filler 14 between the column 1 and the reinforcing body 13 and is injected to a position above the filler 14.
The filler 15 has a function of preventing collapse of the column 1 due to bending and increasing the proof stress, but may be omitted depending on the seismic proof strength required for the casting 1. Further, in the present embodiment, the filler 15 is injected up to a position above the filler 14 outside the column 1 (a height different from the outer filler 14), and the column 1 and its surroundings. It also has a function of preventing stress concentration in a specific range by changing the cross-sectional area including the reinforcing material 13 and the filler 14 in stages.

Further, as shown in FIG. 1, a portion of the column body 1 surrounded by the reinforcing body 13 has a portion having a lower strength than the other portion 20 of the column body 1 (hereinafter referred to as a low strength band 21). Is provided.
The low-strength band 21 is formed by dividing a part or all of the steel material 10 in the column 1 up and down, and the column 1 and the reinforcing body 13 in the low-strength band 21 The combined bending strength with the fillers 14 and 15 is set to be smaller than the bending strength of the other portion 20 of the column 1.
Then, when a large-scale earthquake occurs by reducing the bending strength of the column 1 in the low-strength band 21, as shown in FIGS. 7A and 7B, the low-strength band 21 The column 1 can be reliably tilted at the point.

In the column structure as described above, as shown in FIGS. 7A and 7B, when a large-scale earthquake occurs, first, the low-strength zone 21 of the column 1 is damaged to cause the column. The body 1 is inclined easily. The column 1 at this time is supported by a reinforcing body 13 that surrounds the outer periphery of the column 1, a filler 14 in the space between the column 1 and the reinforcing body 13, and a filler 15 in the column 1. At that time, the seismic energy acting on the column body 1 is absorbed by plastically deforming the reinforcing body 13 (and some of the fillers 14 and 15). Prevents falling completely from foundation B.
That is, in the above columnar structure, the bending strength of the columnar body 1 near the base is positively reduced, and the earthquake force applied to the columnar body 1 is applied to the reinforcing body 13 (and some of the fillers 14 and 15). By absorbing by plastic deformation, the foundation B of the column 1 can be protected.

Moreover, the above columnar structures can also be installed by constructing the existing columnar 1 later.
That is, in the hollow column 1 in which a plurality of reinforcing wires 10 are embedded in the foundation B from the lower end over a predetermined length and are continuous in the length direction, the strength adjusting step, the reinforcing member installing step The filler injection process is sequentially performed.
Specifically, in the first strength adjustment step, a hole is partially opened in the column 1 in the vicinity of the foundation B, and a part or all of the reinforcing wire 10 is cut up and down with a tool such as a cutter, A low strength band 21 having a lower strength than the other portion 20 is formed on the column 1.

Next, in the reinforcing body installation step, the reinforcing body 13 is provided so as to surround the outer periphery of the column body 1 of the low-strength band 21 on the foundation B. Thereafter, in the filler injection step, the space between the column body 1 and the reinforcing body 13 is provided. Filler 14 such as mortar is injected into the space. Further, in order to reinforce the column 1, a through hole reaching the hollow portion 1 </ b> A is opened in the column 1 according to the situation, and the filler 15 is injected into the column 1 through the through hole.
And it becomes possible to construct the reinforcement structure which concerns on this invention later with respect to the existing column 1 by passing through the above strength adjustment processes, a reinforcement body installation process, and a filler injection | pouring process one by one.

As described in detail above, according to the columnar structure according to the present embodiment, the reinforcing body 13 that surrounds the outer periphery of the columnar body 1 is provided in the upper part of the foundation B, and the portion of the column surrounded by the reinforcing body 13 is provided. Since a low-strength belt 21 having a lower strength than that of the other portion 20 is provided on the body 1 and a filler 14 is provided in the space between the column 1 and the reinforcing body 13, a large-scale earthquake occurs. First, the low-strength band 21 of the column 1 is damaged to make the column 1 easy to tilt. The column body 1 at this time is supported by a reinforcing body 13 surrounding the outer periphery of the column body 1 and a filler 14 injected into a space between the column body 1 and the reinforcing body 13. At this time, the seismic energy acting on the column body 1 is absorbed by plastically deforming the reinforcing body 13, thereby preventing the column body 1 from falling from the foundation B.
That is, the present invention actively reduces the bending strength of the column 1 near the base and absorbs the seismic force applied to the column 1 by plastic deformation of the reinforcing member 13. It becomes possible to protect the base B.

Moreover, in the columnar structure according to the present embodiment, for example, the low strength band 21 of the column 1 is formed by dividing the reinforcing wire 10 in the column 1 up and down, as described above. Protecting the foundation B of the column 1 by actively reducing the bending strength of the column 1 near the base and absorbing the earthquake force applied to the column 1 by plastic deformation of the reinforcement 13 Is possible.
In the columnar structure according to the present embodiment, in the low-strength band 21 of the columnar body 1, the combined bending strength of the columnar body 1, the reinforcing body 13, and the filler 14 in the portion of the low-strength band 21 is Since it is set to be smaller than the bending strength of the other part 20 of the body 1 (parts other than the low strength band 21), when a large-scale earthquake occurs, the location of the low strength band 21 is set as a plastic hinge. The column body 1 can be tilted and the seismic energy acting on the column body 1 can be received by the reinforcing body 13 and the filler 14.

  In the columnar structure according to the present embodiment, the filler 15 is provided in the lower part of the internal space of the hollow columnar body 1. For example, by injecting the filler 15 to a position above the filler 14, the change in the cross-sectional area including the column 1 and the surrounding reinforcing material 13 and the filler 14 is made stepwise. Stress concentration on a part can be prevented.

  Further, in the columnar structure according to the present embodiment, the strength adjusting step of forming the low strength band 21 in the vicinity of the base B of the column 1 than the other portion 20, and the column 1 of the low strength band 21 on the base B The reinforcing body 13 is provided so as to surround the outer periphery of the reinforcing body 13 and the filler injecting process of injecting the filler 14 into the space between the column 1 and the reinforcing body 13 is sequentially performed. As a result, it is possible to obtain a columnar structure that can protect the above-mentioned foundation B and prevent the column body 1 from being completely collapsed.

In the above embodiment, the case where the present invention is applied to a railway viaduct has been described. However, the present invention can also be applied to reinforcement of a column provided in another structure.
In the said embodiment, although steel materials were cut | disconnected with the cutter, you may cut | disconnect using another means, for example, a wire saw.
As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.

  The present invention relates to a columnar structure and a column body reinforcing method for protecting the foundation of a columnar body from a large-scale earthquake.

DESCRIPTION OF SYMBOLS 1 Column 1A Hollow part 10 Steel material 13 Reinforcement body 14 Filler (1st filler)
15 Filler (second filler)
20 Other parts 21 Low strength band B Basic

Claims (11)

A hollow columnar structure in which a plurality of reinforcing wires that are embedded in a foundation from a lower end over a predetermined length and are continuous in the length direction are disposed inside,
Provide a reinforcing body that surrounds the outer periphery of the column body at a position above the foundation, and provide a portion of the column body that is surrounded by the reinforcing body with a lower strength than the other parts ,
Providing a first filler in a space between the column and the reinforcing body;
A second filler is filled in the lower part of the internal space of the column,
The columnar structure, wherein the second filler is filled up to a position above the first filler . A hollow columnar structure in which a plurality of reinforcing wires that are embedded in a foundation from a lower end over a predetermined length and are continuous in the length direction are disposed inside,
Provide a reinforcing body that surrounds the outer periphery of the column body at a position above the foundation, and provide a portion of the column body that is surrounded by the reinforcing body with a lower strength than the other parts ,
A structure of a column body in which the combined bending strength of the column body, the reinforcing body, and the filler in the portion having the low strength is set to be smaller than the bending strength of the other portion of the column body . A hollow columnar structure in which a plurality of reinforcing wires that are embedded in a foundation from a lower end over a predetermined length and are continuous in the length direction are disposed inside,
Provide a reinforcing body that surrounds the outer periphery of the column body at a position above the foundation, and provide a portion of the column body that is surrounded by the reinforcing body with a lower strength than the other parts ,
The columnar structure characterized in that the low-strength portion is formed by dividing a part or all of the reinforcing wire vertically . The column structure according to claim 2 or 3 , wherein a first filler is provided in a space between the column and the reinforcing body. The reinforcing member is steel, the structure of the cylindrical body according to claim 1 or 4 wherein the first sealing member is characterized by a mortar. The columnar structure according to any one of claims 1 to 4 , wherein the reinforcing body is a fibrous material integrated in a large number. A method of reinforcing a hollow column body in which a plurality of reinforcing wires embedded in a foundation from a lower end over a predetermined length and arranged in a length direction are disposed inside,
Strength adjusting step for forming a portion having a lower strength than the other portion in the vicinity of the foundation of the column body,
A reinforcing body installation step of providing a reinforcing body so as to surround the outer periphery of the column body ;
Have a, a filling material injection step of filling the first sealing member in the space between the columnar body and the reinforcing member,
The method for reinforcing a columnar body is characterized in that the low-strength portion is formed by dividing a part or all of the reinforcing wire in the vertical direction . A method of reinforcing a hollow column body in which a plurality of reinforcing wires embedded in a foundation from a lower end over a predetermined length and arranged in a length direction are disposed inside,
Strength adjusting step for forming a portion having a lower strength than the other portion in the vicinity of the foundation of the column body,
A reinforcing body installation step of providing a reinforcing body so as to surround the outer periphery of the column body ;
Have a, a filling material injection step of filling the first sealing member in the space between the columnar body and the reinforcing member,
Reinforcement of the columnar body characterized in that the combined bending strength of the column, the reinforcing body and the filler in the portion having the low strength is set smaller than the bending strength of the other portion of the columnar body. Method. A method of reinforcing a hollow column body in which a plurality of reinforcing wires embedded in a foundation from a lower end over a predetermined length and arranged in a length direction are disposed inside,
Strength adjusting step for forming a portion having a lower strength than the other portion in the vicinity of the foundation of the column body,
A reinforcing body installation step of providing a reinforcing body so as to surround the outer periphery of the column body ;
A filler injection step of filling a space between the column body and the reinforcing body with the first filler ;
I have a,
Filling the lower part of the internal space of the column with the second filler,
The method for reinforcing a columnar body, wherein the second filler is filled up to a position above the first filler . The reinforcement is steel, pillar method reinforcement according to any one of claims 7 to 9 wherein the first sealing member is characterized by a mortar. The column reinforcing method according to any one of claims 7 to 9, wherein the reinforcing body is a fibrous material integrated in a large number.

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