JP2007056499A - Seismic reinforcement structure and seismic reinforcement method for existing column - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seismic reinforcement structure of an existing column, which enables quick execution of the seismic reinforcement construction of the existing column, and which prevents mortar from coming off after the construction. <P>SOLUTION: This seismic reinforcement structure of the existing column comprises: the existing column 50; a spiral hoop reinforcement 1 which is wound around the existing column 50 in such a manner that a gap S is made between the hoop reinforcement 1 and a peripheral surface 51 of the existing column 50; and four bag bodies 3 which are arranged in the gap S, and filled with a hardening material 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a seismic reinforcing structure and a seismic reinforcing method for an existing column, for example, which seismically strengthens an existing column made of reinforced concrete from the outside.

  Conventionally, the seismic reinforcement structure for an existing column includes an existing column, a spiral hoop that is wound around the existing column with a gap from the peripheral surface of the existing column, the existing column, and the spiral hoop. And a mortar that covers the spiral hoop muscles (see Japanese Patent No. 3406820).

However, in the conventional seismic reinforcement structure for existing pillars, since the mortar is sprayed on the entire surface of the existing pillars, materials and equipment for spraying the mortar are required locally, and the mortar It was not suitable for rapid construction because plastering such as trowel holding and finishing work were required. Moreover, when cracks occurred on the surface of the mortar after construction, there was a risk of the mortar peeling off.
Japanese Patent No. 3406820

  Then, the subject of this invention is providing the seismic reinforcement structure of the existing pillar and the seismic reinforcement method which prevent the peeling of the mortar after construction while making the construction of the earthquake resistance reinforcement of the existing pillar quick.

In order to solve the above problems, the seismic reinforcement structure of the existing pillar of the present invention is
With existing pillars,
A spiral hoop muscle wound around the existing pillar;
It is provided with the bag body which is arrange | positioned between the said existing pillar and the said spiral hoop muscle, and is filled with the hardening | curing material.

  Here, the hardener is, for example, mortar or concrete.

  According to the seismic reinforcement structure of the existing column of the present invention, the bag body filled with the hardener is disposed between the existing column and the spiral hoop muscle. Fill between the spiral hoop muscles. Thus, since the hardened material (such as mortar) is packed in the bag body, the operation of spraying, trowel holding, and curing is unnecessary, and the construction of the seismic reinforcement is simplified. Rapid construction is possible. Moreover, since the said hardening material is packaged in a bag, even if the said hardening material cracks after completion, peeling of the said hardening material is prevented and safety | security improves.

  Moreover, in the earthquake-proof reinforcement structure of the existing pillar of one Embodiment, the said existing pillar is a cross-sectional substantially square shape, and the said bag is arrange | positioned at the at least four corners of the said existing pillar.

  According to the seismic reinforcement structure of the existing pillar of this embodiment, the bag body may be disposed at least at the four corners of the existing pillar, the material of the hardened material can be reduced, and labor saving of seismic reinforcement construction is possible become. That is, the four corners of the existing pillars have low rigidity and are highly likely to be destroyed during an earthquake. By arranging the bags at the four corners, the existing pillars can be reinforced.

  In the seismic reinforcement structure for an existing column according to an embodiment, the existing column has a substantially square cross section, the bag is disposed on at least one side of the existing column, and the spiral hoop muscle is , Circumscribed at the four corners of the existing pillar.

  According to the seismic reinforcement structure for an existing column according to this embodiment, the existing column has a substantially rectangular cross section, and the bag is disposed on at least one side of the existing column, and the spiral hoop muscle Is circumscribed at the four corners of the existing pillar, so that the bag is in the circumscribed circle of the existing pillar, and even if the existing pillar is reinforced, the cross-section of the existing pillar can be reduced, and the space used Can be spread.

  Moreover, in the earthquake-proof reinforcement structure of the existing pillar of one Embodiment, the said bag body is metal.

  According to the seismic reinforcement structure of the existing pillar of this embodiment, since the bag body is made of metal, even if the curing material filled in the bag body is thin, the hardening is caused by the stress during the earthquake. The material can be prevented from cracking or breaking. Moreover, the said metal bag is durable.

  In the seismic reinforcement structure for an existing column according to an embodiment, the bag body extends in the axial direction of the existing column, and a metal member extending in the axial direction of the existing column is provided in the bag body. Has been inserted.

  According to the seismic reinforcement structure for an existing column of this embodiment, the metal member extending in the axial direction of the existing column is inserted into the hardened material. Between the winding pitches. Thus, the said hardening | curing material between the winding pitches of the said spiral hoop muscle also exhibits the effect | action which restrains the said existing pillar by the said metal member. Therefore, the winding pitch of the spiral hoop line can be increased (widened), and the work of winding the helical hoop line around the existing column can be reduced.

Moreover, the seismic reinforcement method for the existing pillar of the present invention is as follows:
Arranging the bag body on the peripheral surface of the existing pillar and winding a spiral hoop around the existing pillar;
And a step of filling the bag body disposed between the existing pillar and the spiral hoop line with a hardening material.

  According to the seismic reinforcement method for an existing column of the present invention, since the bag body disposed between the existing column and the spiral hoop is filled with the curing material, the gap between the existing column and the spiral hoop is Fill with the bag. Thus, since the said hardening | curing material (such as mortar) is packed in the said bag body, the operation | work of spraying, a trowel press, and a curing becomes unnecessary, and the construction of earthquake-proof reinforcement is simplified, and rapid. Construction becomes possible. Moreover, since the said hardening | curing material is packaged, even if the said hardening | curing material cracks after completion, peeling of the said hardening | curing material is prevented and safety | security improves.

  According to the seismic reinforcement structure of the existing column of the present invention, the bag body filled with the hardener is disposed between the existing column and the spiral hoop muscle, so that the seismic reinforcement of the existing column can be performed quickly. In addition, the mortar can be prevented from peeling off after construction.

  In addition, according to the seismic reinforcement method for an existing column of the present invention, the bag disposed between the existing column and the spiral hoop is filled with the hardening material, so that the seismic reinforcement of the existing column can be performed quickly. At the same time, it is possible to prevent the mortar from peeling off after construction.

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

(First embodiment)
FIG. 1: has shown the cross-sectional view which is one Embodiment of the earthquake-proof reinforcement structure of the existing pillar of this invention. FIG. 2 shows a front view of the seismic reinforcement structure of the existing pillar. The seismic reinforcement structure of the existing column includes the existing column 50, the spiral hoop muscle 1 wound around the existing column 50 with a gap S from the peripheral surface 51 of the existing column 50, and the existing column 50. And four bag bodies 3 which are disposed in the gap S between the hoop muscles 1 and the spiral hoop muscles 1 and are filled with a hardening material 2. The gap S is preferably narrow.

  The existing pillar 50 is made of reinforced concrete, for example. The existing pillar 50 has a substantially rectangular cross section. The hardener 2 is, for example, mortar or concrete.

  The spiral hoop muscle 1 has a shape along the peripheral surface 51 of the existing column 50 before being arranged around the existing column 50. One end and the other end of the spiral hoop 1 wound around the existing column 50 are fixed to the peripheral surface 51 of the existing column 50. In addition, in order to continuously wind the spiral hoop muscle 1 from the upper end to the lower end of the existing column 50, the length of one spiral hoop muscle 1 processed in advance is wound from the upper end to the lower end of the existing column 50. If it is insufficient to rotate, the end of the processed spiral hoop muscle 1 is overlapped with the end of the other spiral hoop muscle 1, and the overlapped portion is fixed with a clip. The spiral hoop muscle 1 is formed.

  The spiral hoop 1 is made of, for example, a high-tensile steel wire or a steel stranded wire. When a high-tensile steel wire is used for the helical hoop 1, the high-tensile steel wire is lightweight, durable, and easy to construct. When two high-tensile steel wires are connected to each other, the two high-tensile steel wires are wrapped for a predetermined length, and the wrap portion is fastened with a wire grip.

  On the other hand, when a steel stranded wire is used for the helical hoop 1, the steel stranded wire is resistant to rusting because it has a rust prevention treatment on its surface, and is inexpensive. In addition, when connecting two steel strands mutually, it can connect simply using the grip for strands, etc.

  The bag body 3 extends along the axis C of the existing pillar 50. The bag 3 is made of metal, for example, a thin flexible metal plate or a fine stainless steel mesh (net). The bag body 3 may be made of an acrylic resin and has poor stretchability.

  The four bag bodies 3 are arranged not at the entire surface 51 of the existing pillar 50 but at the four corners of the existing pillar 50. The bag body 3 is attached to the peripheral surface 51 of the existing pillar 50. That is, the four bag bodies 3 fill the gaps S between the four corners of the existing pillar 50 and the spiral hoop muscle 1.

  Five metal members 4 a are inserted into the bag 3. The metal member 4a has a rod shape and extends in the direction of the axis C of the existing column 50. That is, the metal member 4 a is disposed across the winding pitch P of the spiral hoop 1.

  The five metal members 4a are biased to the spiral hoop muscle 1 side and are arranged in a shape along the corner of the existing column 50 (corner of the spiral hoop muscle 1). That is, the metal member 4 a presses the inside of the corner of the spiral hoop muscle 1 through the bag body 3.

  According to the seismic reinforcement structure of the existing column having the above-described configuration, the four corners of the existing column 50 are tightened by the helical hoop muscle 1 and the bag body 3 over substantially the entire length along the axis C of the existing column 50. Therefore, it is possible to prevent the existing pillar 50 from being cracked or broken by the stress during the earthquake. That is, the four corners of the existing pillar 50 have low rigidity and are highly likely to be destroyed during an earthquake. By arranging the bag 3 at the four corners, the existing pillar 50 can be reinforced. . In addition, the lower part 52 and the upper part 53 of the existing pillar 50 are not covered with the bag body 3 so as to be flexibly bent by an earthquake load.

  Moreover, since the said bag 3 is arrange | positioned only in the four corners of the said existing pillar 50, the material of the said hardening | curing material 2 can be reduced and the labor saving of construction of an earthquake-proof reinforcement is attained.

  Moreover, since the said hardening | curing material 2 (such as mortar) is stuffed in the said bag body 3, the operation | work of spraying, a trowel press, and curing becomes unnecessary, and the construction of earthquake-proof reinforcement is simplified, Rapid construction is possible. Moreover, since the said hardening material 2 is packaged, even if the said hardening material 2 cracks after completion, the peeling of the said hardening material 2 is prevented and safety | security improves.

  Further, the mortar having the cover thickness of the spiral hoop muscle 1 is not necessary, and the cross-sectional area of the existing pillar 50 reinforced with earthquake resistance can be reduced, and the space used around the existing pillar 50 reinforced with earthquake resistance can be reduced. Can be spread.

  Further, since the bag body 3 is made of metal, even if the hardened material 2 filled in the bag body 3 is thin, the hardened material 2 is not cracked or broken by stress during an earthquake. Can be. Moreover, the metal bag 3 has durability.

  Further, since the metal member 4a is disposed across the winding pitch P of the spiral hoop muscle 1, the hardened material 2 between the winding pitch P of the spiral hoop muscle 1 is also the metal. The member 4a exhibits the effect of restraining the existing pillar 50. Therefore, the winding pitch P of the spiral hoop bar 1 can be increased (widened), and the work of winding the spiral hoop bar 1 around the existing column 50 can be reduced.

  Moreover, since the metal member 4a presses the spiral hoop muscle 1 via the bag 3, the hardened material 2 between the winding pitches P of the spiral hoop muscle 1 is the existing pillar. 50 is effectively restrained.

  Next, a method for seismic reinforcement of the existing pillar 50 will be described.

  As shown in the cross-sectional view of FIG. 3 and the front view of FIG. 4, the bag body 3 is attached to the peripheral surfaces 51 at the four corners of the existing pillar 50. The metal member 4 a is inserted into the bag body 3. Then, the spiral hoop 1 is wound around the existing column 50 with a gap S from the peripheral surface 51 of the existing column 50. The spiral hoop muscle 1 is formed in advance along the peripheral surface 51 of the existing column 50.

  Here, since the method of winding the spiral hoop muscle 1 around the existing column 50 is described in detail in Japanese Patent No. 149647 belonging to the applicant, only a brief description will be given.

  That is, the spiral hoop muscles 1 processed into a spiral bundle are arranged vertically so that the loop surface of the bundle is parallel to the peripheral surface 51 of the existing column 50 and bent at a right angle at which winding begins (illustrated). The starting end is inserted and fixed in a hole (not shown) provided at the lower end of the peripheral surface 51, and is rotated around the existing column 50 while rotating in a direction in which the bundle of the spiral hoop muscles 1 can be unwound. However, one loop is wound above the existing pillar 50. Finally, the end bent at right angles (not shown) is inserted and fixed in a hole (not shown) provided at the upper end of the peripheral surface 51, and the winding is finished.

  In addition, the fixing method of the edge part of the said spiral hoop muscle 1 is not fixing to the surrounding surface 51 of the said existing pillar 50, The part which wound the said spiral hoop muscle 1 around the said existing pillar 50 and overlapped it with a clip. It may be fixed.

  In this method, the spiral bundle of the spiral hoop muscles 1 is not greatly bent and opened in the loop unwinding direction in the loop plane, but the spiral bundle of the spiral hoop muscles 1 is circulated around the existing column 50. However, since the helical hoop muscle 1 can be wound in an elastic deformation range that is slightly twisted around its axis, it does not require a large-scale machine such as a hydraulic cylinder as in the prior art, and it is easy and quick with only human power. Can be constructed.

  Next, the curing material 2 is filled into the bag body 3 disposed in the gap S between the existing pillar 50 and the spiral hoop muscle 1. At this time, a tube 5 (shown in FIG. 4) is inserted into the upper opening of the bag body 3 and the hardening material 2 starts to flow from the tube 5 into the bag body 3. The cured material 2 is poured until S is filled. And by inject | pouring the said hardening | curing material 2 in the said bag 3, the said metal member 4a is biased and located in the said spiral hoop muscle 1 side. The plurality of metal members 4a are arranged in a shape along the corner of the existing column 50 (the corner of the spiral hoop muscle 1).

  In addition, the distance between the spiral hoop muscle 1 and the existing column 50 is made substantially constant by sequentially injecting the curing material 2 into the bag bodies 3 and 3 on the diagonal line of the existing column 50. The four corners of the existing pillar 50 can be tightened with a substantially uniform force.

  According to the seismic reinforcement method for existing pillars, since the hardened material 2 (such as mortar) is packed in the bag body 3, the operations of spraying, trowel holding, and curing are not required. Construction is simplified and rapid construction becomes possible. Moreover, since the said hardening material 2 is packaged, even if the said hardening material 2 cracks after completion, the peeling of the said hardening material 2 is prevented and safety | security improves.

  In the first embodiment, the case where the bag body 3 is disposed at the four corners of the existing pillar 50 has been described. However, the bag body 3 is disposed on at least one side of the existing pillar 50. The spiral hoop muscle 1 may be circumscribed at the four corners of the existing column 50. Therefore, the bag 3 is in the circumscribed circle of the existing pillar 50, and even if the existing pillar 50 is reinforced, the cross section of the existing pillar 50 can be reduced and the use space can be expanded.

(Second Embodiment)
FIG. 5 shows a second embodiment of the seismic reinforcement structure for an existing column of the present invention. The difference from the first embodiment will be described. In the second embodiment, the metal member 4b is shaped like a strip along the axis C of the existing pillar 50. The metal member 4b has a curved shape along the corner of the existing column 50 (the corner of the spiral hoop muscle 1). The bag body 3 is sized to cover substantially half of the peripheral surface 51 of the existing pillar 50 including two adjacent corners of the existing pillar 50, and includes two bag bodies 3 and 3. That is, substantially the entire peripheral surface 51 of the existing pillar 50 is covered by the two bag bodies 3 and 3. Since other structures are the same as those of the first embodiment, description thereof is omitted.

  According to the seismic reinforcement structure for an existing column having the above configuration, in addition to the effects of the first embodiment, the two bag bodies 3 and 3 cover substantially the entire peripheral surface 51 of the existing column 50. The existing pillar 50 can be reliably reinforced. Moreover, since the said strip | belt-plate-shaped metal member 4b has a large area compared with rod shape, the four corners of the said existing pillar 50 can be restrained effectively.

  Next, a method for seismic reinforcement of the existing column 50 will be described. The method is the same as that of the first embodiment except that the curing material 2 is injected into the two bags 3 and 3 in order or simultaneously. Since there is, explanation is omitted.

  In addition, this invention is not limited to the above-mentioned embodiment. For example, the cross-sectional shape of the existing pillar 50 may be a circle other than a circle or a rectangle. Further, the number of the bags 3 may be increased or decreased.

It is a cross-sectional view which shows 1st Embodiment of the earthquake-proof reinforcement structure of the existing pillar of this invention. It is a front view of the seismic reinforcement structure of this existing pillar. It is a cross-sectional view which shows the seismic reinforcement method of this existing pillar. It is a front view which shows the seismic reinforcement method of this existing pillar. It is a cross-sectional view which shows 2nd Embodiment of the earthquake-proof reinforcement structure of the existing pillar of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Spiral hoop muscle 2 Hardening material 3 Bag body 4a (Bar-shaped) metal member 4b (Band-plate-shaped) metal member 5 Tube 50 Existing column 51 Peripheral surface 52 Lower part 53 Upper part S Clearance C Axis P Winding pitch

Claims (6)

With existing pillars,
A spiral hoop muscle wound around the existing pillar;
A seismic reinforcement structure for an existing column, comprising a bag body disposed between the existing column and the spiral hoop and filled with a hardener. In the seismic reinforcement structure of the existing pillar according to claim 1,
The existing pillar has a substantially rectangular cross section,
The seismic reinforcement structure for an existing pillar, wherein the bag is disposed at at least four corners of the existing pillar. In the seismic reinforcement structure of the existing pillar according to claim 1,
The existing pillar has a substantially rectangular cross section,
The bag body is disposed on at least one side of the existing column, and the spiral hoop is circumscribed at the four corners of the existing column. In the seismic reinforcement structure of the existing pillar according to claim 1,
A seismic reinforcement structure for an existing pillar, wherein the bag is made of metal. In the seismic reinforcement structure of the existing pillar according to claim 1,
The bag body extends in the axial direction of the existing column, and a metal member extending in the axial direction of the existing column is inserted into the bag body, wherein the seismic reinforcement of the existing column is provided. Construction. Arranging the bag body on the peripheral surface of the existing pillar and winding a spiral hoop around the existing pillar;
A method for seismic reinforcement of an existing column, comprising the step of filling the bag body disposed between the existing column and the spiral hoop bar with a curing material.

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