JP5984273B1 - Column reinforcement method and column reinforcement structure - Google Patents

Abstract

The present invention provides a column reinforcing method capable of simply and efficiently performing column reinforcing work under extremely limited conditions of work space and work time. A column reinforcing method includes a step of arranging a steel plate around a column to be reinforced, and a step of winding a reinforcing sheet impregnated with an adhesive around the outer surface of the steel plate. An adhesive-impregnated sheet is prepared in advance so that the adhesive-impregnated amount of the reinforcing sheet 8 is 250 g / m 2 to 350 g / m 2, and then carried to the site. The column reinforcement structure includes a steel plate 3 disposed around the column 10 to be reinforced, and an adhesive-impregnated reinforcement sheet 8 wound around the outer surface of the steel plate 3 a plurality of times. [Selection] Figure 2

Description

  The present invention relates to a reinforcing method and reinforcement of a pillar to be reinforced in a very limited situation of working space and working time, such as a pillar in a subway, a viaduct, a pillar in a parking lot, and a pillar immediately after a disaster in a building. Concerning structure.

  Reinforcement work such as pillars in subway tunnels, viaducts, pillars in parking lots, and pillars immediately after a disaster occurs in a building is performed under conditions where work space and work time are extremely restricted.

  For example, when reinforcing a central pillar in a subway tunnel, it must be constructed in a short time during the night outside the operating hours. Specifically, considering that the current is flowing through the rail for 30 minutes after the current supplied to the subway rail is stopped, the working time of the day is several hours during the night when the train is stopped. There is only about 3 hours of construction time from time to 4am.

  Moreover, the gap between the middle pillar and the train is narrow, and the work space is extremely limited. Thus, since the work space that can be secured in the subway tunnel is small, heavy machinery and large-sized devices cannot be used. When reinforcing viaducts, pillars in parking lots, and pillars in disaster-stricken buildings, the same applies in terms of time and space.

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

  For example, Japanese Patent Laid-Open No. 9-177334 (Patent Document 1) discloses a concrete column reinforcing method. As shown in FIG. 7, the reinforcing method disclosed in Patent Document 1 arranges a plurality of steel plates 40 so as to surround the concrete pillar 1, and overlaps ends of adjacent steel plates 40 with bolts and nuts 41. In this method, the grout material is filled in the gap portion 42 between the concrete pillar 1 and the steel plate 40.

  Japanese Patent Laying-Open No. 2005-23745 (Patent Document 2) also discloses a concrete column reinforcing method. 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 column 1 so as to surround the concrete column 1, and these steel plates 45 are arranged. The steel sheet 45 is bundled by winding a belt-like fiber sheet 46 around the outer periphery of the steel sheet, and a grout material is filled in the gap 42 between the four steel sheets 45 and the concrete pillar 1.

   However, these reinforcing 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 reinforcement method disclosed in these patent documents should be adopted as a reinforcement method in a situation where the reinforcement work must be performed in a short time as in the case of reinforcing the middle pillar of the subway tunnel as described above. I can't. In addition, in these reinforcing methods, since the injection device for injecting the grout material into the gap between the column and the steel plate is used in a narrow work space, the work at the site becomes very difficult.

  The inventor of the present application arranges a plurality of steel plates in a 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. A method for winding a belt-like fiber sheet while applying an adhesive on the outer peripheral surface was examined. In this method, grout material is not used, so the work is fast, and the strength of earthquake resistance is not changed compared to the case of using grout material (for example, see Non-Patent Document 1: This document uses mortar which is also a cloud material) The seismic strength performance of the reinforced steel sheet is being investigated.) In order for the applied adhesive to function adequately as an adhesive, a certain amount of curing time is required, so that the reinforcement work can be done quickly within the limited work time. Is difficult to complete efficiently. To increase the adhesive strength, even if the amount of adhesive applied is increased, the adhesive hangs down until the adhesive is properly cured, and it takes time and effort to remove the adhesive that hangs down on the ground or floor. It cost.

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

Japan Society of Civil Engineers 51st Annual Lecture Meeting (September 1996) V-529 “Experimental Study on the Effect of Detail on Steel Sheet Reinforcement” Tsutomu Watanabe Member of the Railway Technical Research Institute Member of the Railway Technical Research Institute Masato Yasuhara

  In the reinforcement method in which the belt-like fiber sheet is wound around the steel plate surrounding the reinforcing column, in order to increase the strength of the belt-like fiber sheet, the belt-like fiber sheet is wound twice or triple while applying an adhesive around the steel plate. However, in that case, it is impossible to prevent the adhesive from dripping from the sheet, so that the amount of the adhesive that should be held on the belt-like fiber sheet becomes insufficient, resulting in insufficient strength. all right.

For example, in order to give sufficient strength, it is necessary to hold an adhesive of 300 g / m ² per belt-like fiber sheet, but if the sheet is wound around the steel sheet while applying the adhesive around the site, the adhesive It was found that the adhesive was held only about 200 g / m ² per belt-like fiber sheet.

  Moreover, when the adhesive is applied to the belt-like fiber sheet, as described above, the adhesive dropped from the belt-like fiber sheet contaminates the floor surface in the subway tunnel. 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-mentioned problems, and a column reinforcing method and a column reinforcing method capable of simply and efficiently performing a reinforcing operation of a column to be reinforced in a very limited situation of working space and working time. The purpose is to provide a structure.

  In order to solve the above problems, the present invention is characterized by the following.

  The column reinforcing method of the present invention includes a step of arranging a steel plate around a column 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. Is done.

  It is preferable that a plurality of the steel plates are arranged in the longitudinal direction with respect to the column to be reinforced.

  It is preferable that the reinforcing sheet is wound in a lateral direction with respect to the reinforcing target column via the steel plate.

  It is preferable to surround the reinforcing target column in such a manner that the steel plate is divided into a plurality of sheets.

  It is preferable that the winding end end surface of the one reinforcing sheet is wound so as to come to 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 surfaces of the surrounding steel plates overlap in the vertical direction with the end surfaces 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.

  Preferably, the method further includes 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 column to be reinforced.

  Preferably, the method further includes 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 column reinforcing structure of the present invention includes a steel plate disposed around a column to be reinforced, and an adhesive-impregnated reinforcing sheet wound around the outer surface of the steel plate a plurality of times, thereby achieving the above object. The

  It is preferable that a plurality of the steel plates are arranged in the longitudinal direction with respect to the column to be reinforced.

  It is preferable that the reinforcing sheet is wound in a lateral direction with respect to the reinforcing object column via the steel plate.

  It is preferable to surround the reinforcing target column in such a manner that the steel plate is divided into a plurality of sheets.

  It is preferable that the winding end end surface of the one reinforcing sheet is wound so as to come to 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 surfaces of the surrounding steel plates overlap in the vertical direction with the end surfaces 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 a grout material is applied to the wall surface around the reinforcement target column.

  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 at a factory or the like, and this adhesive-impregnated sheet is carried to the site and The winding work of the adhesive-impregnated sheet is completed simply by winding the steel sheet. Therefore, it is not necessary to attach the reinforcing sheet to the outer surface of the steel sheet with an adhesive at the site, and the time for applying the adhesive at the site can be omitted.

  Moreover, since the adhesive is not applied to the outer surface of the steel sheet or sheet as in the prior art, the adhesive is properly cured and has an appropriate adhesive force. The surface is not soiled.

  Furthermore, since an appropriate amount can be adhered by impregnating the reinforcing sheet with the adhesive, there is no reduction in strength due to insufficient adhesive. There will be no dripping on site. Therefore, the number of times the reinforcing sheet is wound 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 of the conventional reinforcing method, when the sheet needs to be triple-rolled, the present invention does not cause insufficient strength even if the sheet is double-rolled.

  According to the reinforcing structure of the present invention, since the steel sheet disposed around the column to be reinforced and the adhesive-impregnated reinforcing sheet wound around the outer surface of the steel sheet are provided a plurality of times, the reinforcing sheet cured with the adhesive is a steel sheet. Since the reinforcement target column is restrained from the outside via the, the earthquake resistance of the column can be improved.

  The column surface of the column to be reinforced does not necessarily form a flat surface. Therefore, the steel plate applied to the column surface cannot contact the column surface stably. It can be applied and flattened by a technique such as applying a grout material to the column surface so that both sides are in efficient contact.

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

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

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

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

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

(Embodiment 1)
FIG. 1 is a schematic longitudinal sectional view of a subway premises (inside a subway tunnel), FIG. 2 is a schematic 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 premises, for example, a plurality of middle pillars 10 are provided on a lower floor board 12 that partitions an up train track (rail) and a down train track (rail) 14. Are erected along the rail at a predetermined interval.

  The middle pillar 10 is formed so that the cross section becomes, for example, a square shape. A steel plate 3 is disposed around the middle pillar 10 so as to surround the middle pillar 10. One or more steel plates 3 can be arranged in the longitudinal direction (vertical direction) of the middle column 10 with respect to the middle column 10. Moreover, the steel plate 3 can surround the middle pillar 10 in the form of being divided into one sheet or a plurality of sheets. In this embodiment, for example, four steel plates 3 (the number of steel plates are hidden in the reinforcing sheet and do not appear in the figure) are arranged so as to surround the middle pillar 10 in the vertical direction.

  As the steel plate 3, for example, a relatively thin steel plate having a thickness of about 1.6 mm is used. The steel plate 3 may be directly covered with a single piece of the reinforcement target column, but is divided into a plurality of pieces and bent into an L-shaped cross section. It is also possible to use those formed in the above manner. The length of the plate-like portion on one side and the plate-like portion on the other side sandwiching the corner portion of the steel plate 3 formed in an L shape may be the same, or the length may be changed. Since such a thin steel plate 3 is lightweight, the steel plate 3 can be manually carried to the construction site in the subway yard without using heavy machinery.

  As shown in FIG. 4A, each steel plate 3 is disposed so as to surround the corner of the middle column 10. The divided end surfaces of the surrounding steel plates 3 overlap with the end surfaces of the adjacent divided steel plates 3 in the vertical direction. That is, the end portions of the divided steel plates 3 surrounding the middle column 10 extend along the wall surface of the middle column 10 and the end portions overlap on the wall surface. In this manner, the end of the other divided steel plate 3 that is adjacent in the lateral direction (in the circumferential direction of the middle column) is superimposed on the end of the one divided steel plate 3.

  As shown in FIG. 5, the steel plate 3 is disposed outside the middle column 10 so that at least a part of the inner surface of the steel plate 3 is in contact with the outer surface of the middle column 10.

  Next, the reinforcing sheet 8 impregnated with the adhesive is wound around the outer surface of the steel plate 3. Naturally, the sheet 8 may be wound around the outer surface of the steel plate 3 that protrudes from the outer surface of the steel plate 3 and is adjacent to the column in the vertical 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 a plurality of types of fibers. Aramid fibers are preferred in terms of excellent properties such as tensile strength and price. The fiber sheet can be used in the form of one layer or two or more layers. Two layers are usually sufficient in view of reinforcement strength and work efficiency.

  In order to impregnate the fiber sheet with the adhesive, the fiber sheet is coated with an adhesive with a brush or a roller, or the fiber sheet is immersed in a container containing the adhesive so that the sheet is impregnated with 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 substantially constant, the viscosity of the adhesive is constant regardless of the season, and therefore the amount of the adhesive impregnated into the sheet does not vary greatly depending on the season.

  Although the kind of adhesive impregnated in the fiber sheet is not limited, it is preferable to use an adhesive such as an epoxy adhesive, a methacrylic adhesive, and an acrylic adhesive.

  Particularly preferred adhesives are those that cure at room temperature. Both a two-component adhesive and a one-component adhesive that start to cure by mixing a main agent and a curing agent both made of synthetic chemical components can be used. However, it is preferable to use a two-component adhesive because a two-component adhesive has higher reliability for securing 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 It is.

When the amount of the adhesive impregnated 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 amount of adhesive impregnation 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 impregnating a predetermined amount of adhesive into the fiber sheet in advance at the factory. The adhesive is properly cured and has a strong adhesive ability. The time required for the appropriate curing is 2 to 3 hours with an outside air temperature of 20 ° C. as a standard. The viscosity of the adhesive varies depending on the adhesive manufacturer and the type of adhesive. For this reason, two types of adhesives for summer use and winter use are prepared by manufacturers, and those having appropriate viscosities 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 middle pillar 10.

  The reinforcing sheet 8 may be wound in a slightly inclined state with respect to the middle column 10 via the steel plate 3, but usually the reinforcing sheet 8 is wound laterally (horizontal direction) around the middle column 10 via the steel plate 3. . In other words, one or more 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 middle pillar 10 (direction perpendicular to the axial direction of the middle pillar). Wrap it around the pillar surface.

  It is preferable that the winding end face of one reinforcing sheet 8 wound around the middle column 10 overlaps the winding start face of the reinforcing sheet 8.

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

  Although the shape and size of the reinforcing sheet 8 are not limited, 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 middle pillar 10 can be appropriately set according to the length of the circumference of the middle pillar 10. For example, the length dimension of the reinforcing sheet 8 can be greater than or equal to the width dimension of the middle pillar 10. The reinforcing sheet 8 wound around the column surface via the steel plate 3 is preferably wound in the form of an L-shaped cross section (FIG. 6A) or a U-shaped cross section (FIG. 6B). 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 adjacent to each other in the circumferential direction of the middle column 10 from the viewpoint of strength.

  The width dimension of the reinforcing sheet 8 in the vertical direction (vertical direction of the middle pillar) is determined in consideration of the handling property 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 column surface via the steel plate 3, 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 is composed of the plurality of steel plates 3. It is fixed to the middle pillar 10 via

  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 middle pillar 10, the winding 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 face of the other reinforcing sheet 8. The overlapping portion of the end portion of one reinforcing sheet 8 positioned on the upper side of the middle column 10 and the overlapping portion of the end portion of the reinforcing sheet 8 positioned on the lower side adjacent to the reinforcing sheet 8 are It is different in direction. It is natural for effective strength.

  The reinforcing sheet 8 may be wound in one layer as shown in FIGS. 4B, 6A and 6B, or may be wound in two layers as shown in FIG. 6C. . Of course, even more.

  When the reinforcing sheet 8 is wound around the pillar surface via the steel plate 3 in two layers, 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 of the reinforcing sheet 8 is arranged so that the overlapping part 81 of the adjacent first layer reinforcing sheet 8 and the overlapping part 82 of the adjacent second layer reinforcing sheet 8 are displaced in the circumferential direction of the middle pillar 10. It is preferable to wrap around one reinforcing sheet 8.

  In this way, by shifting the overlapping portions 81 and 82 of the reinforcing sheet 8 in the circumferential direction of the middle pillar 10, the thickness of the reinforcing sheet 8 over the entire circumference becomes substantially equal, and the strength becomes uniform.

  You may temporarily fix in the state which pressed the reinforcement sheet 8 against the outer surface of the steel plate 3, using the pressing jig etc. which press the reinforcement sheet 8 from the outside.

   In addition, exterior finishing, such as painting, finishing mortar, or tile, can also be performed on the outer surface of the reinforcing sheet 8 that has been wound.

  In this reinforcing sheet 8, the fiber sheet is preliminarily impregnated with a predetermined amount of adhesive, and the adhesive is not impregnated at the site, so that the workability is excellent and the reinforcing sheet 8 is carried into the site. Sometimes, the adhesive is in a semi-cured state that does not sag 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 during application of the adhesive and does not contaminate the floor surface in the field.

  As shown in FIG. 5, when the surface of the middle column 10 is uneven, when the steel plate 3 is disposed on the outer surface of the middle column 10, the inner surface of the steel plate 3 is in contact with only the protrusions on the surface of the middle column 10. A gap 11 is formed 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 column 10 and the steel plate 3 in order to bring the wall surface of the middle column 10 into contact with the steel plate surface with high efficiency. . Thereby, the surface of the middle pillar 10 becomes flat, and the steel plate 3 is stably disposed on the middle pillar 10, thereby enhancing the reinforcing function of the reinforcing sheet 8.

  The grout material 6 is applied to the surface of the middle column 10 before the steel plate 3 is arranged around the middle column 3, or after the steel plate 3 is arranged around the middle column 3, or between the middle column 10 and the steel plate 3. It is possible to inject into the gap 11 formed in the above.

  When 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 10, the grout material 6 is applied to the surface of the middle pillar 10 using a tool such as a brush or a trowel. That's fine. In order to fill the gap 11 between the middle column 10 and the steel plate 3 with the grout material 6, the grout material 6 is injected from a hole formed in the steel plate 3. At the time of injection, the steel plate 3 is temporarily fixed to the middle column 10 with a pin or the like to hold the steel plate 3 to the middle column 10.

  In such a reinforcing method of the middle column 10, the entire circumference of the middle column 10 is surrounded by a plurality of steel plates 3, 3, and a plurality of reinforcing sheets 8 are formed on the column surface via the plurality of steel plates 3, 3. Affixed with a pre-impregnated adhesive. The plurality of reinforcing sheets 8 are integrated with the adhesive being solidified. Therefore, since the reinforcing sheet 8 restrains the movement of the entire middle column 10 via the steel plate 3, the earthquake resistance of the middle column 10 can be improved.

  Since the plurality of steel plates 3 are fixed to the middle column 10 by the reinforcing sheet 8, there is no need to weld the steel plates 3 to each other or to connect them with a connector or the like, and it is easy to fix the steel plates 3 to the columns.

  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 column is easy, and the adhesive does not sag from the sheet during winding.

  Since the reinforcing sheet 8 is wound around the column surface via the steel plate 3, even when the surface of the column is uneven, the appearance of the reinforcing sheet 8 becomes flat and the appearance is not impaired.

(Other embodiments)
In the said embodiment, although four steel plates were arrange | positioned around the reinforcement object column in the vertical direction of the reinforcement object column, the number of the steel plates arrange | positioned around the column is not limited to this. One or two or more steel plates can be arranged around the pillar. In order to be able to adapt to pillars having different sizes, it is preferable to divide the steel plate into two or more. Furthermore, the division | segmentation cross-sectional shape of a steel plate is not restricted to L shape, A steel plate whose cross-sectional shape is U shape can also be used.

  In the said embodiment, although the center pillar of the subway was demonstrated as a reinforcement object pillar, this invention is not limited to a center pillar. In addition to reinforcing the middle pillar of a subway, for example, it can be suitably implemented for reinforcing a viaduct, a parking lot, a building, or a pillar immediately after a disaster occurs.

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

  The present invention reinforces a pillar to be reinforced in a situation where a pillar to be reinforced such as a pillar in a tunnel of a subway, a viaduct, a pillar in a parking lot, a pillar immediately after a disaster in a building must be reinforced in a short time. Provide construction method and reinforcement structure.

3 Steel plate 8 Reinforcement sheet 10 Middle pillar

Claims (7)

Column reinforcement method,
The column reinforcement method is
Disposing the steel plate on the outside of the column to be reinforced so that the steel plate surrounds the column to be reinforced and at least part of the inner surface of the steel plate is in contact with the outer surface of 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;
Including
The column reinforcement method is
The steel sheet after the step of placing the walls surrounding the reinforcing target column, applying a grout into the wall surface, further comprising, pillar reinforcement construction method. The column reinforcing method according to claim 1, wherein a plurality of the steel plates are arranged in a vertical direction with respect to the column to be reinforced. The column reinforcing method according to claim 1 or 2, wherein the reinforcing sheet is wound in a transverse direction with respect to the column to be reinforced through the steel plate. The column reinforcement method according to any one of claims 1 to 3, wherein the steel plate is divided into a plurality of pieces to surround the column to be reinforced. The winding end end surface of the one reinforcing sheet is wound so as to come to 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. The column reinforcement method described. The column reinforcing method according to claim 4, wherein the divided end faces of the steel plates overlap in the longitudinal direction 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} , according to one of claims 1 to 6 carried in situ thereon to create an adhesive-impregnated sheet advance Column reinforcement method.

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