JP6702822B2 - Column reinforcement method and column reinforcement structure - Google Patents

Description

INDUSTRIAL APPLICABILITY The present invention is to reinforce a pillar to be reinforced in a situation where work space and working time are extremely limited, such as reinforcement of a pillar in a subway, a viaduct, a pillar in a parking lot, and a pillar immediately after a disaster occurs in a building. Regarding the structure.

Reinforcement works such as middle pillars in subway tunnels, viaducts, pillars in parking lots, pillars immediately after a disaster occurs in a building are carried out under conditions where working space and working time are extremely limited.

For example, when reinforcing the middle pillar of a subway tunnel, the construction must be performed during the nighttime outside the operating hours. Specifically, considering that the current is flowing through the rail for 30 minutes after stopping the current supplied to the subway rail, the working time of one day is several hours at night when the train is stopped, 1 am in the morning. There is only about 3 hours of construction time from 04:00 to 4:00.

Moreover, the working space is extremely limited due to the narrow gap between the center pillar and the train. Since the work space that can be secured inside the subway tunnel is so small, heavy equipment and large equipment cannot be used. When reinforcing viaducts, pillars in parking lots, and pillars at the site of a building where a disaster has occurred, the time and space restrictions are exactly the same.

By the way, conventionally, in order to enhance the earthquake resistance of a pillar of a building, a method of surrounding the pillar with a reinforcing material and reinforcing the pillar has been proposed.

For example, Japanese Laid-Open Patent Publication No. 9-177334 (Patent Document 1) discloses a method for reinforcing concrete columns. In the reinforcing method disclosed in Patent Document 1, as shown in FIG. 7, a plurality of steel plates 40 are arranged so as to surround the concrete pillar 1, and end portions of adjacent steel plates 40 are overlapped with each other by a bolt/nut 41. It is a method of connecting and filling the grout material in the clearance 42 between the concrete column 1 and the steel plate 40.

In addition, Japanese Patent Laid-Open No. 2005-23745 (Patent Document 2) also discloses a method of reinforcing concrete columns. In the reinforcing method disclosed in Patent Document 2, as shown in FIG. 8, steel plates 45 having an L-shaped cross section are arranged at four corners of the concrete pillar 1 so as to surround the concrete pillar 1, and the steel plates 45 are formed. This is a method in which these steel plates 45 are bundled by winding a strip-shaped fiber sheet 46 around the outer circumference of, and the grout material is filled in the gaps 42 between the four steel plates 45 and the concrete columns 1.

However, these reinforcement methods require a long curing period for the grout material filled in the gap between the concrete column and the steel plate to solidify. Therefore, the reinforcing method disclosed in these patent documents should be adopted as a reinforcing method in a situation where the reinforcing work must be performed in a short time as in the case of reinforcing the center pillar of a subway tunnel as described above. I can't. Moreover, in these reinforcing methods, since the pouring device for pouring the grout material into the gap between the column and the steel plate is used in a narrow working space, it becomes very difficult to work on site.

The inventor of the present application arranges a plurality of steel plates in the lateral direction so as to surround the periphery of the reinforcement target column as a method of reinforcing the reinforcement target column (for example, a concrete column) without using a grout material, and A method of winding a strip-shaped fiber sheet while applying an adhesive to the outer peripheral surface was examined. In this method, since the grout material is not used, the work is fast, and the seismic resistance is not different from the case where the grout material is used (for example, see Non-Patent Document 1: This document describes mortar that is also a cloud material. We are using it to study the seismic strength performance of reinforced steel sheets.) In order for the applied adhesive to function adequately as an adhesive, it takes a certain amount of curing time, which is why reinforcement work can be performed quickly within the limited work time. Is difficult to complete efficiently. Even if the amount of adhesive applied is increased to increase the adhesive strength, the adhesive drips downward until the adhesive hardens properly, and it takes time and time to remove the adhesive that drips on the ground or floor. Needed

JP, 9-177334, A JP, 2005-23745, A

51st Annual Scientific Lecture Meeting of the Japan Society of Civil Engineers (September 1996) V-529 "Experimental Study on the Effect of Detail on Steel Plate Reinforcement" p1056-p1057 JR Tokai Member Yutaka Tabata Railway Technical Research Institute Member Sato Tsutomu Railway Technical Research Institute Member Tadato Watanabe Railway Technical Research Institute Member Masato Yasuhara

In the reinforcement method in which the strip-shaped fiber sheet is wrapped around the steel plate surrounding the column to be reinforced, in order to increase the strength of the strip-shaped fiber sheet, the strip-shaped fiber sheet is wrapped in double or triple while applying an adhesive around the steel plate. However, at that time, since it is not possible to prevent the adhesive from dripping from the sheet, the amount of adhesive that should be retained on the strip-shaped fiber sheet becomes insufficient, which may result in insufficient strength. all right.

For example, in order to have sufficient strength, it is necessary to hold an adhesive agent of 300 g/m ² per strip of fiber sheet, but if the sheet is wrapped around the steel sheet while the adhesive is being applied, the adhesive agent It was found that the adhesive was retained only about 200 g/m ² per strip-shaped fiber sheet due to the dripping of the adhesive.

Moreover, when the adhesive is applied to the strip-shaped fiber sheet, the adhesive dripping from the strip-shaped fiber sheet stains the floor surface in the tunnel of the subway as described above. Although it is necessary to clean the floor surface soiled with this adhesive, the floor surface cannot be cleaned because the construction time is limited as described above.

The present invention has been made to solve the above problems, and a column reinforcing method and a column reinforcing method that can easily and efficiently perform the reinforcing work of a column to be reinforced under a very limited working space and working time. It is intended to provide a structure.

In order to solve the above problems, the present invention has the following features.

The method for reinforcing a pillar of the present invention includes a step of arranging a steel plate around the pillar to be reinforced, and a step of winding a reinforcing sheet impregnated with an adhesive around the outer surface of the steel plate, thereby achieving the above object. To be done.

It is preferable that a plurality of the steel plates be arranged in the vertical direction with respect to the reinforcement target column.

The reinforcing sheet is preferably wound laterally around the pillar to be reinforced via the steel plate.

It is preferable that the steel plate is divided into a plurality of sheets to surround the pillar to be reinforced.

It is preferable that the winding end end surface of the one reinforcing sheet is wound so as to be located at a position different from the winding end end surface of another reinforcing sheet adjacent in the longitudinal direction in the circumferential direction of the column to be reinforced.

It is preferable that the divided end faces of the surrounding steel plates vertically overlap with the end faces of the adjacent divided steel plates.

Adhesive impregnation amount of the reinforcing sheet, as is ^{250g / m 2 ~350g / m 2} , preferably carried in situ thereon to create an adhesive-impregnated sheet in advance.

It is preferable to further include a step of applying a grout material to the wall surface to flatten the wall surface before the step of disposing the steel plate on the wall surface around the reinforcement target column.

It is preferable to further include a step of applying a grout material to the wall surface to flatten the wall surface after the step of disposing the steel plate on the wall surface around the reinforcement target column.

The reinforcing structure of the pillar of the present invention comprises a steel plate arranged around the pillar to be reinforced, and an adhesive-impregnated reinforcing sheet wound a plurality of times around the outer surface of the steel plate, whereby the above object is achieved. It

It is preferable that a plurality of the steel plates be arranged in the vertical direction with respect to the reinforcement target column.

The reinforcing sheet is preferably wound laterally around the pillar to be reinforced through the steel plate.

It is preferable that the steel plate is divided into a plurality of sheets to surround the pillar to be reinforced.

It is preferable that the winding end end surface of the one reinforcing sheet is wound so as to be located at a position different from the winding end end surface of another reinforcing sheet adjacent in the longitudinal direction in the circumferential direction of the column to be reinforced.

It is preferable that the divided end faces of the surrounding steel plates vertically overlap with the end faces of the adjacent divided steel plates.

Adhesive impregnation amount of the reinforcing sheet, is preferably ^{250g / m 2 ~350g / m 2} .

It is preferable that grout material is applied to the wall surface around the pillar to be reinforced.

According to the reinforcing method of the present invention, since the reinforcing sheet impregnated with the adhesive is wound around the outer surface of the steel sheet, the adhesive impregnated sheet is prepared in advance in a factory or the like, and the adhesive impregnated sheet is carried into the site and is transported to the site. The winding operation of the adhesive-impregnated sheet is completed simply by winding it on the steel plate. Therefore, it is not necessary to attach the reinforcing sheet to the outer surface of the steel sheet with an adhesive on site, and the time for applying the adhesive can be omitted on site.

Moreover, unlike the conventional method, the adhesive is not applied to the outer surface of the steel plate or sheet, so the adhesive is appropriately cured and has an appropriate adhesive force. Does not stain the surface.

Further, since the reinforcing sheet can be impregnated with the adhesive and an appropriate amount can be attached, the strength does not decrease due to insufficient adhesive. It does not drip on site. Therefore, the number of windings of the reinforcing sheet can be reduced as compared with the case where the sheet is attached while applying the adhesive on site. Rather, for example, in the case where the conventional reinforcing construction method requires triple winding of the sheet, the present invention does not cause insufficient strength even with double winding.

According to the reinforcing structure of the present invention, the steel sheet arranged around the column to be reinforced and the adhesive impregnated reinforcing sheet wound plural times on the outer surface of the steel sheet are provided. Since the column to be reinforced is restrained from the outside through the, the earthquake resistance of the column can be improved.

The pillar surface of the reinforcement target pillar does not necessarily have to be a flat surface. Therefore, the steel plate applied to the column surface cannot stably contact the column surface. It is possible to apply it by a method such as applying a grout material to the pillar surface so as to efficiently contact the both surfaces to make the surface flat.

It is a schematic longitudinal cross-sectional view showing the premises of a subway. 1 is a schematic cross-sectional view of a central pillar portion of a subway yard according to an embodiment of the present invention. FIG. 3 is a perspective view of a central pillar portion shown in FIG. 2. It is explanatory drawing which shows the reinforcement construction method of the center pillar shown in FIG. It is a longitudinal cross-sectional view of the main part of the center pillar shown in FIG. FIG. 6( a) is a schematic cross-sectional view of a center pillar, showing an example in which a one-layer reinforcing sheet is wound around the outer surface of a steel plate in an L shape, and FIG. 6( b) is a one-layer reinforcing sheet in a U-shape. Fig. 6 shows an example in which the outer surface of the steel sheet is wrapped around, and Fig. 6(c) shows an example in which a two-layer reinforcing sheet is wrapped around the outer surface of the steel sheet. It is sectional drawing of the conventional concrete pillar reinforcement structure. It is a perspective view of another conventional concrete pillar reinforcement structure.

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

The present invention is a pillar to be reinforced such as a pillar in a subway tunnel, a viaduct, a pillar in a parking lot, or a pillar immediately after a disaster occurs in a building in a situation where working space and working time are extremely limited. It can be applied to the reinforcement method of.

The columns to be reinforced in the present invention include reinforced concrete columns, steel reinforced concrete columns, steel tube concrete columns, steel columns and the like.

Hereinafter, as an example of an embodiment of the present invention, a pillar reinforcing method and a pillar reinforcing structure for reinforcing a concrete inner pillar in a subway tunnel will be described.

(Embodiment 1)
FIG. 1 is a schematic vertical cross-sectional view of a subway premises (inside a subway tunnel), FIG. 2 is a schematic horizontal cross-sectional view of a central pillar portion of the subway premises, and FIG. 3 is a perspective view of the central pillar portion.

As shown in FIGS. 1 to 3, in the subway yard, for example, a plurality of center pillars 10 are provided on a lower floor plate 12 that separates an up train track (rail) and a down train track (rail) 14. Are erected at predetermined intervals along the rail.

The middle pillar 10 is formed so that the cross section thereof has, for example, a rectangular shape. A steel plate 3 is arranged around the center pillar 10 so as to surround the center pillar 10. One or more steel plates 3 can be arranged with respect to the center pillar 10 in the vertical direction (vertical direction) of the center pillar 10. Further, the steel plate 3 can surround the middle pillar 10 in a form of being divided into one or a plurality of sheets. In this embodiment, for example, four steel plates 3 (the number of steel plates is hidden in the reinforcing sheet and does not appear in the drawing) in the vertical direction are arranged so as to surround the center pillar 10.

As the steel plate 3, for example, a relatively thin steel plate having a thickness of about 1.6 mm is used, and the periphery of the column to be reinforced may be directly covered with one sheet, but it is divided into a plurality of pieces and bent into an L-shaped cross section. It can also be used. The length of the plate-shaped portion on one side and the plate-shaped portion on the other side sandwiching the corner of the L-shaped steel plate 3 may be the same or may be different. Since such a thin steel plate 3 is lightweight, it is possible to manually carry the steel plate 3 to the construction site on the subway premises without using heavy machinery.

As shown in FIG. 4A, the steel plates 3 are arranged so as to surround the corners of the center pillar 10. The divided end faces of the surrounding steel plates 3 vertically overlap with the end faces of the adjacent divided steel plates 3. That is, the end of each of the divided steel plates 3 surrounding the middle pillar 10 extends along the wall surface of the middle pillar 10, and the ends overlap each other on the wall surface. In this way, the end of one of the divided steel plates 3 is overlapped with the end of the other divided steel plate 3 that is laterally adjacent (in the circumferential direction of the center column).

As shown in FIG. 5, the steel plate 3 is arranged outside the middle pillar 10 such that at least a part of the inner surface of the steel plate 3 contacts the outer surface of the middle pillar 10.

Next, the reinforcing sheet 8 impregnated with the adhesive is wound around the outer surface of the steel plate 3. It is naturally possible that the sheet 8 protrudes from the outer surface of the steel plate 3 and is wound around the outer surface of the steel plate 3 adjacent in the column longitudinal direction.

The reinforcing sheet 8 is obtained by impregnating a fiber sheet having a large number of fibers with an adhesive.

Examples of fibers that can be used for the fiber sheet include carbon fibers, glass fibers, aramid fibers, polyethylene fibers, and vinylon fibers. These fibers can be used alone or in combination of plural kinds of fibers. Aramid fiber is preferable in terms of excellent properties such as tensile strength and price. The fiber sheet may be used in a form of one layer or two or more layers. Two layers are usually sufficient in view of reinforcement strength and work efficiency.

To impregnate this fiber sheet with the adhesive, the fiber sheet is impregnated with the adhesive at the factory by applying the adhesive with a brush or roller, or by immersing the fiber sheet in a container containing the adhesive. be able to. According to these adhesive impregnation methods, a desired amount of adhesive can be impregnated into the sheet. Moreover, when the sheet is impregnated with the adhesive in the factory, the sheet can be impregnated with a substantially constant amount of the adhesive. That is, since the temperature in the factory is almost constant, the viscosity of the adhesive becomes constant regardless of the season, and therefore, the amount of the adhesive impregnated in the sheet does not vary greatly depending on the season.

The type of adhesive with which the fiber sheet is impregnated is not limited, but it is preferable to use an adhesive such as an epoxy adhesive, a methacrylic adhesive, or an acrylic adhesive.

A particularly preferable adhesive is an adhesive that is curable at room temperature. Two-component type adhesives, in which curing begins when both the main agent made of synthetic chemical components and a curing agent are mixed, and one-component type adhesives can be used together, but generally the two-component type However, it is preferable to use the two-component type adhesive because the two-component type adhesive has higher reliability in ensuring a predetermined adhesive strength.

Impregnation amount of the adhesive to the fiber sheet is preferably ^{250g / m 2 ~350g / m 2} , more ^{preferably, 280g / m 2 ~330g / m} 2, particularly ^{preferably, 290g / m 2 ~310g / m} 2 Is.

If the impregnated amount of the adhesive is less than 250 g/m ² , the adhesive strength of the reinforcing sheet 8 to the steel plate 3 tends to decrease. Even if the impregnated amount of the adhesive exceeds 350 g/m ² , the adhesive strength does not increase so much, the weight increases, and the material cost increases.

In this way, the reinforcing sheet 8 is prepared by previously impregnating the fiber sheet with a predetermined amount of the adhesive in the factory. The adhesive is appropriately cured and has a strong adhesive ability. The time required for the appropriate curing is 2 to 3 hours with the outside air temperature of 20° C. as a standard. The viscosity of the adhesive varies depending on the manufacturer of the adhesive and the type of the adhesive. For this reason, the adhesives having two kinds of viscosities, one for summer and the other for winter, are prepared by the manufacturer, and the one having an appropriate viscosity can be used.

This adhesive-impregnated sheet (reinforcing sheet) 8 is carried into the construction site. Then, the reinforcing sheet 8 is wound around the outer surface of the steel plate 3 arranged around the center pillar 10.

The reinforcing sheet 8 may be wound around the center pillar 10 via the steel plate 3 in a slightly inclined state, but normally, the reinforcing sheet 8 is wound laterally (horizontal direction) about the center pillar 10 via the steel plate 3. .. That is, one or a plurality of reinforcing sheets 8 are attached to the steel plate 3 so that the longitudinal direction of the fibers contained in the reinforcing sheet 8 substantially coincides with the circumferential direction of the center column 10 (direction orthogonal to the axial direction of the center column). Wrap it around the pillar surface.

It is preferable that the winding end end surface of one reinforcing sheet 8 wound around the center pillar 10 overlaps the winding start end surface of the reinforcing sheet 8.

As shown in FIG. 4B, when a plurality of reinforcing sheets 8 are wound around the center pillar 10, the plurality of reinforcing sheets 8 are so arranged that the end portions of the adjacent reinforcing sheets 8 overlap each other. Wrap around the center pillar 10. For example, as shown in FIG. 6A, after the first reinforcing sheet 8a is wound around the pillar surface with the steel plate 3 interposed therebetween, the end portion of the second reinforcing sheet 8b adjacent to the first reinforcing sheet 8 is The second reinforcing sheet 8b is wound around the pillar surface via the steel plate 3 so as to overlap the end portion of the first reinforcing sheet 8a.

The shape and size of the reinforcing sheet 8 are not limited, but for example, a belt-shaped reinforcing sheet or a rectangular reinforcing sheet can be used.

The length dimension of the reinforcing sheet 8 in the circumferential direction of the center pillar 10 can be appropriately set according to the length of the circumference of the center pillar 10. For example, the length dimension of the reinforcing sheet 8 may be equal to or larger than the width dimension of the center pillar 10. The reinforcing sheet 8 wound around the pillar surface through the steel plate 3 is preferably wound in a shape such as an L-shaped cross section (FIG. 6A) or a U-shaped cross section (FIG. 6B). Also from the viewpoint of strength, the reinforcing sheet 8 is preferably wound around the outer surface of the steel plate 3 so as to straddle the first steel plate 3 and the second steel plate 3 that are adjacent to each other in the circumferential direction of the center pillar 10.

The width dimension of the reinforcing sheet 8 in the longitudinal direction (vertical direction of the center pillar) is determined in consideration of the handleability of the reinforcing sheet, and is arbitrary as long as it can be easily transported to the site.

After the reinforcing sheet 8 is wound around the pillar surface with the steel sheet 3 interposed therebetween, the adhesive impregnated in the reinforcing sheet 8 is cured, so that the plurality of reinforcing sheets 8 are integrated and the reinforcing sheet 8 includes the plurality of steel sheets 3 It is fixed to the center pillar 10 through.

As shown in FIG. 3 and FIG. 4B, when a plurality of reinforcing sheets 8 are wound in the longitudinal direction (vertical direction) of the center pillar 10, one winding end end surface of one reinforcing sheet 8 is adjacent in the longitudinal direction. The reinforcing sheet 8 is wound so as to come to a position different from the winding end surface of the other reinforcing sheet 8. The overlapping portion of the end portion of one reinforcing sheet 8 located on the upper side of the middle pillar 10 and the overlapping portion of the end portion of the reinforcing sheet 8 located on the lower side adjacent to the reinforcing sheet 8 are the circumference of the middle pillar 10. It is different in direction. It is natural for effective strength to be obtained.

The reinforcing sheet 8 may be wound in one layer as shown in FIGS. 4(b), 6(a) and 6(b), or may be wound in two layers as shown in FIG. 6(c). .. Of course, it may be more than that.

When the reinforcing sheet 8 is wound in two layers around the pillar surface via the steel plate 3, the second layer reinforcing sheet ((upper layer reinforcing sheet) 8 is wound on the first layer reinforcing sheet (lower layer reinforcing sheet) 8. However, the second layer reinforcing sheet 8 is arranged so that the overlapping portion 81 of the adjacent first layer reinforcing sheet 8 and the overlapping portion 82 of the adjacent second layer reinforcing sheet 8 are displaced in the circumferential direction of the center pillar 10. It is preferable to wind it around the first reinforcing sheet 8.

By offsetting the overlapping portions 81 and 82 of the reinforcing sheet 8 in the circumferential direction of the center pillar 10 in this manner, the thickness of the reinforcing sheet 8 over the entire circumference becomes substantially equal and the strength becomes uniform.

The reinforcing sheet 8 may be temporarily fixed while being pressed against the outer surface of the steel plate 3 by using a pressing jig or the like that presses the reinforcing sheet 8 from the outside.

If necessary, the outer surface of the wound reinforcing sheet 8 may be subjected to coating, finishing mortar, or external finishing such as tiling.

In this reinforcing sheet 8, the fibrous sheet is preliminarily impregnated with a predetermined amount of the adhesive, and since the fibrous sheet is not impregnated with the adhesive on site, the workability is excellent and the reinforcing sheet 8 is carried into the site. At this time, the adhesive is in a semi-cured state where it does not drip from the fiber sheet. Therefore, unlike the conventional case, the adhesive does not hang down from the steel plate 3 or the reinforcing sheet 8 when the adhesive is applied and stain the floor surface at the site.

As shown in FIG. 5, when the surface of the inner pillar 10 is uneven, when the steel plate 3 is arranged on the outer surface of the inner pillar 10, the inner surface of the steel plate 3 contacts only the protrusions on the surface of the inner pillar 10, so that the inner pillar A gap 11 is created between the outer surface of 10 and the steel plate 3. In order to enhance the reinforcing function of the reinforcing sheet 8, the grout material 6 is applied to the gap 11 formed between the middle pillar 10 and the steel plate 3 in order to bring the wall surface of the middle pillar 10 into contact with the steel plate surface with high efficiency. .. Thereby, the surface of the center pillar 10 becomes flat and the steel plate 3 is stably arranged on the center pillar 10, whereby the reinforcing function of the reinforcing sheet 8 can be enhanced.

The grout material 6 is applied to the surface of the middle pillar 10 before the steel plate 3 is arranged around the middle pillar 3 or after the steel plate 3 is arranged around the middle pillar 3, or between the middle pillar 10 and the steel plate 3. Can be injected into the gap 11 formed in

When the grout material 6 is applied to the surface of the inner pillar 10 before the steel plate 3 is arranged around the inner pillar 10, the grout material 6 is applied to the surface of the inner pillar 10 using a tool such as a brush or a trowel. Good. In order to fill the gap 11 between the center pillar 10 and the steel plate 3 with the grout material 6, the grout material 6 is injected from the hole formed in the steel plate 3. At the time of injection, the steel plate 3 is temporarily fixed to the center pillar 10 with a pin or the like to hold the steel plate 3 on the center pillar 10.

In such a reinforcing method of the inner pillar 10, the entire circumference of the inner pillar 10 is surrounded by a plurality of steel plates 3 and 3, and a plurality of reinforcing sheets 8 are provided on the pillar surface through the plurality of steel plates 3 and 3. It is attached with an adhesive that has been impregnated in advance. The plurality of reinforcing sheets 8 are integrated in a state where the adhesive is hardened. Therefore, since the reinforcing sheet 8 restrains the movement of the entire middle pillar 10 via the steel plate 3, the earthquake resistance of the middle pillar 10 can be improved.

Since the plurality of steel plates 3 are fixed to the middle pillar 10 by the reinforcing sheet 8, it is not necessary to weld the steel plates 3 to each other or to connect them by a connecting tool or the like, and it is easy to fix the steel plates 3 to the pillar.

Moreover, since the reinforcing sheet 8 has a predetermined size, it can be easily transported to a narrow site.

Although the reinforcing sheet 8 is impregnated with the adhesive, the work of winding the reinforcing sheet 8 around the pillar is easy, and the adhesive does not drip from the sheet during winding.

Since the reinforcing sheet 8 is wound around the column surface via the steel plate 3, even if the surface of the column is uneven, the reinforcing sheet 8 has a flat appearance and does not spoil the appearance.

(Other embodiments)
In the above embodiment, four steel plates are arranged in the vertical direction of the reinforcement target column around the reinforcement target column, but the number of steel plates arranged around the column is not limited to this. One or more steel plates can be placed around the column. In order to be able to adapt to columns of different sizes, it is preferable to divide the steel plate into two or more pieces for use. Further, the divided cross-sectional shape of the steel plate is not limited to the L-shape, and a steel plate having a U-shaped cross-section may be used.

In the above-described embodiment, the middle pillar of the subway is described as the pillar to be reinforced, but the present invention is not limited to the middle pillar. In addition to the reinforcement of the middle pillar of the subway, for example, it can be suitably applied to the reinforcement of the viaduct, the parking lot, the building, and the pillar immediately after the disaster occurs.

In the above-described embodiment, the cross-sectional shape of the middle pillar is quadrangular, but the present invention can be applied even if the middle pillar is a polygonal pillar (for example, a pentagonal pillar, a hexagonal pillar, etc.) other than a quadrangle, a cylinder, or the like. In that case, the steel plate has a shape along the outer shape of the column. The steel plate may be divided into a plurality of upper and lower parts, and the respective divided steel plates may be vertically connected to be mounted around the pillar.

INDUSTRIAL APPLICABILITY The present invention is to reinforce a pillar to be reinforced, such as a pillar in a tunnel of a subway, a viaduct, a pillar in a parking lot, or a pillar immediately after a disaster occurs in a building, in a situation where reinforcement is required in a short time. Provide construction method and reinforcement structure.

3 Steel plate 8 Reinforcement sheet 10 Middle pillar

Claims (8)

Arranging a steel plate around the column to be reinforced,
A step of winding a plurality of reinforcing sheets impregnated with an adhesive around the outer surface of the steel sheet, such that the plurality of reinforcing sheets surround one circumference of the reinforcing target pillar, and the circumferential direction of the reinforcing target pillar. A method of reinforcing columns, including the steps of: winding the ends of the reinforcing sheet adjacent to each other so that they overlap each other. The step of arranging the steel plate around the column to be reinforced is
The plurality of steel plates are the reinforcement target columns such that the steel plates adjacent to each other in the circumferential direction of the reinforcement target columns overlap each other and at least part of the inner surface of the steel plates contacts the outer surface of the reinforcement target column. The method for reinforcing a pillar according to claim 1, further comprising the step of arranging the pillar around the pillar. The pillar according to claim 1 or 2 , wherein the end-of-roll end surface of the reinforcing sheet is wound so as to come to a position different from the end-of-roll end surface of another reinforcing sheet adjacent in the longitudinal direction in the circumferential direction of the pillar to be reinforced. Reinforcement method. It said adhesive impregnation of the reinforcing sheet is a ^{250g / m 2 ~350g / m 2} , Retrofit for pillars according to any of claims 1-3. Steel plates arranged around the pillar to be reinforced,
A plurality of adhesive-impregnated reinforcing sheets wound around the outer surface of the steel sheet, wherein the plurality of reinforcing sheets surround one circumference of the reinforcement target pillar and are adjacent to each other in the circumferential direction of the reinforcement target pillar. Reinforcing structure for a column, which includes a reinforcing sheet and ends of the reinforcing sheet are wound so as to overlap each other. The steel plate comprises a plurality of steel plates, the plurality of steel plates, such that the steel plates adjacent to each other in the circumferential direction of the reinforcement target column overlap each other, and at least a part of the inner surface of the steel plate is the reinforcement target column. The column reinforcing structure according to claim 5 , wherein the column reinforcing structure is arranged around the column to be reinforced so as to contact the outer surface. The winding end face of the reinforcing sheet, the other winding end face of the reinforcing sheet adjacent the longitudinal direction is wound so as to come to a different position in the circumferential direction of the reinforcement object columns, according to claim 5 or 6 Pillar reinforcement structure. It said adhesive impregnation of the reinforcing sheet is a ^{250g / m 2 ~350g / m 2} , the reinforcing structure of the column according to any one of claims 5-7.

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