JP5976626B2 - Column reinforcement method and column reinforcement structure - Google Patents

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 the pillars in subway tunnels, viaducts, pillars in parking lots, and pillars immediately after a disaster in a building is carried out in a situation 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, taking into account the current flowing through the rail for 30 minutes after the current supplied to the rail of the subway is taken into consideration, the working time of the day is several hours at 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. The viaducts, parking lot pillars, and disaster-stricken building sites all have the same time and space restrictions.

  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, it is necessary to use an injection device for injecting the grout material in the gap between the column and the steel plate in a narrow work space, which makes the work on site very difficult. .

As a method of reinforcing a reinforcement target column (for example, a concrete column) without using a grout material, the present inventor arranges a plurality of steel plates so as to surround the reinforcement target column, and the outer peripheral surface of the steel plate is arranged. Although we studied the method of winding the belt-like fiber sheet while applying the adhesive, the work is fast because no grout material is used, and the strength of earthquake resistance is not different from the case of using grout material (for example, non-patent literature) Reference 1: In addition, this document investigates the seismic strength performance of the reinforced steel sheet using mortar which is also a cloud material.) In order for the coating adhesive to function sufficiently as an adhesive, a certain curing time is required. Therefore, it is difficult to complete the reinforcement work quickly and efficiently within a limited work time. In order to further increase the adhesive strength, even if the amount of application was increased, the adhesive dropped down until it hardened appropriately, and it took time and effort to remove the adhesive that fell on the ground or floor.

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

Japan Society of Civil Engineers 51st Annual Lecture (September 1996) V-529 "Experimental Study on the Effect of Detail on Steel Sheet Reinforcement" Tsutomu Sato Member, Railway Technical Research Institute Tadayoshi Watanabe Railway Technical Research Institute Member 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, there is a defect that the adhesive dripping from the belt-like fiber sheet stains 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.
(Item 1)
Including a step of arranging a plurality of steel plates around a reinforcing target column, a step of attaching a reinforcing sheet impregnated with an adhesive to the outer surface of the steel plate, and a step of connecting ends of adjacent steel plates Column reinforcement method.
(Item 2)
Said adhesive impregnation amount of the reinforcing sheet, as is ^{250g / m 2 ~350g / m 2} , reinforcing method of the pillars of claim 1 for loading the scene thereon to create an adhesive-impregnated sheet in advance.
(Item 3)
A plurality of steel plates arranged around a column to be reinforced, and a reinforcing sheet affixed to the outer surface of the steel plate via an adhesive, and the ends of the adjacent steel plates are directly or reinforced by a fastener. Reinforcement structure of pillars connected through the ends of the sheet.
(Item 4)
Reinforcing structure of pillars according to the adhesive-impregnated amount of the reinforcing ^{sheet, 250g / m 2 ~350g / m} 2 at which item 3.

  According to the reinforcing method of the present invention, the reinforcing sheet impregnated with the adhesive is affixed to the outer surface of the steel sheet. Therefore, the adhesive-impregnated sheet is prepared in advance at a factory or the like, and the adhesive-impregnated sheet is brought into the field. The adhesive-impregnated sheet can be applied by simply attaching it to the steel sheet at the site. 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 reinforcing sheets to be attached can be reduced as compared with the case where the sheets are 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, the ends of the adjacent steel plates are connected directly by a fastener or via the ends of the reinforcing sheet, so that the steel plate and the reinforcing sheet can be fixed around the column by this connecting operation. The column can be reinforced in a short time. In addition, the combination of the steel plate and the reinforcing sheet can reinforce the column by combining the rigidity of the steel plate and the characteristics of the reinforcing sheet, so that the earthquake resistance of the column can be improved. Since the reinforcing strength is sufficient, a relatively thin steel plate (1.2 to 2.0 mm) can be used.

It is a schematic sectional drawing which shows the premises of a subway. FIG. 2 is a schematic plan view of the subway premises shown in FIG. 1. It is a perspective view of the principal part of the middle pillar of a subway of one example of the present invention. FIG. 4 is a cross-sectional view of the middle pillar shown in FIG. 3. 5 (a) to 5 (e) are cross-sectional views of the connecting portion at the end of the steel plate. It is sectional drawing of the center pillar of the other Example of this invention. 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 FIG. 1 to FIG. 3, in the subway premises, a plurality of middle pillars 10 are rails on a lower floor board 12 that partitions an upward train track (rail) and a downward train track (rail) 14. Along a predetermined interval.

  The middle pillar 10 is formed so that the cross section becomes, for example, a square shape. Two steel plates 3 and 3 are arranged around the middle pillar 10 so as to surround the middle pillar 10.

As the steel plate 3, for example, a relatively thin steel plate having a thickness of about 1.6 mm can be used which is formed by bending it into a U-shaped cross section. 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.

  At both ends of the steel plate 3, connecting portions 4 for connecting the pair of steel plates 3 to each other are formed. In this embodiment, as shown in FIG. 4 and FIG. 5A, both end portions of the steel plate 3 are bent outward to form the connecting portion 4. One or two or more through holes for passing fasteners 16 such as screws and bolts may be formed in the connecting portion 4. As shown in FIG. 3, the connecting portion 4 provided at the end of the steel plate 3 is formed long in the height direction of the middle column 10.

  Next, the reinforcing sheet 8 of a predetermined length impregnated with the adhesive is pressed against the outer surface of the steel plate 3 to attach the reinforcing sheet 8 to the outer surface of the steel plate 3.

  The reinforcing sheet 8 is obtained by impregnating an adhesive into a strip-shaped fiber sheet made of a large number of long fibers extending in one direction.

  Examples of the fiber that can be used for the belt-like fiber sheet include carbon fiber, glass fiber, aramid fiber, polyethylene fiber, and vinylon fiber. These fibers can be used alone or in combination of a plurality of types of fibers.

  In order to impregnate the belt-like fiber sheet with the adhesive, the adhesive is applied to the belt-like fiber sheet at the factory by applying the adhesive with a brush or a roller, or by immersing the belt-like fiber sheet in a container containing the adhesive. Can be impregnated. 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 belt-like fiber sheet is not limited, it is preferable to use an adhesive such as an epoxy adhesive, a methacrylic adhesive, or 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 strip fibrous sheet is preferably from ^{250g / m 2 ~350g / m 2} , more ^{preferably, 280g / m 2 ~330g / m} 2, particularly preferably, 290 g / ^m 2 to 3
10 g / m ² .

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 belt-like 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. And the reinforcement sheet 8 is affixed on the outer surface of the steel plate 3 arrange | positioned around the center pillar 10. FIG.

  Next, the ends of the adjacent steel plates 3 and 3 are connected to each other. For this connection, the connecting portions 4 and 4 formed at the ends of the adjacent steel plates 3 and 3 may be brought into contact with each other, and both the connecting portions 4 and 4 may be connected by a fastener 16 such as a screw, bolt, or nut.

  In order to connect the end portions of the steel plates 3, the end portions of the steel plates 3 and 3 adjacent to each other through the end portions of the reinforcing sheet 8 are connected by the fastener 16 as shown in FIGS. 4 and 5A. You may connect. In this case, the end portion of the reinforcing sheet 8 is extended to the end portion of the steel plate 3 and the pair of steel plates 3 and 3 are connected by the fastener 16 and at the same time the end portion of the reinforcing sheet 8 is fixed to the end portion of the steel plate 3. To do.

  Furthermore, as shown in FIG. 5 (b), the ends of the adjacent steel plates 3, 3 may be directly connected by a fastener 16. In this case, the end portion of the sheet 8 does not extend to the end portion of the steel plate 3, and the end portion of the reinforcing sheet 8 is separated from the operation of connecting the pair of steel plates 3 and 3 with the fastener 16. It fixes to the edge part of the steel plate 3 with the fastener 18. FIG.

  As shown in FIG. 5 (c), a long washer plate 17 is arranged on the outside of the reinforcing sheet 8 in the vertical direction, and the reinforcing sheet 8 is pressed by the washer plate 17 to fix the steel plate 3 with the fastener 16. You may make it connect an edge part and the edge part of the sheet | seat 8. FIG.

  Further, as shown in FIGS. 5 (d) and 5 (e), the ends of the adjacent steel plates 3, 3 are extended in opposite directions, and the ends of the steel plates 3, 3 and the sheets 8, 8 are overlapped. In addition, the steel plates 3 and 3 and the sheets 8 and 8 may be connected by the fastener 16. In the embodiment shown in FIG. 5 (e), the end portion of one steel plate 3 is bent to form a step portion 20, and the end portion of the other steel plate 3 is inserted into this step portion 20. . Further, in this example, a large hole into which the bolt head can be inserted and a small elongated hole communicating with the large hole are formed in the steel plate 3 arranged on the inner side, and the elongated hole is passed through the bolt head through the large hole. The bolt is shifted to pass through the through hole of the outer steel plate 3.

  Further, in the embodiment shown in FIGS. 5D and 5E, the holes for passing the fasteners 16 such as bolts are formed as long holes, and the steel plates 3 and 3 fixed by the fasteners 16 are long. By allowing sliding movement within the hole, it is possible to cope with a wider range of column shaking caused by vibration.

  The form of the reinforcing sheet 8 attached to the steel plate 3 can be, for example, the following form.

  The reinforcing sheet 8 has a predetermined width and a plurality of sheets 8 having a predetermined length that is long in the horizontal direction (the fiber direction is along the longitudinal direction of the sheet). You may affix so that it may become a step. Or you may affix the sheet | seat 8 of the predetermined length long in the vertical direction on the whole outer surface of the steel plate 3. FIG.

  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.

  The exterior surface of the sheet 8 attached to the steel plate 3 can be subjected to exterior finishing such as painting, finishing mortar, or tiling as necessary.

  In this reinforcing sheet 8, the belt-like fiber sheet is impregnated with a predetermined amount of adhesive in advance, and is not impregnated with the adhesive on site, so that the workability is excellent and the reinforcing sheet 8 is carried in. Since the adhesive is in a semi-cured state that does not sag from the belt-like fiber sheet, the adhesive does not sag from the steel plate 3 or the sheet 8 during application of the adhesive and does not contaminate the floor surface in the field.

In such a reinforcing method of the middle column 10, the entire circumference of the middle column 10 is surrounded by the plurality of steel plates 3 and 3, and the ends of the steel plates 3 and 3 are connected to each other. Further, the steel plate 3 surrounding the middle pillar 10 is surrounded by the reinforcing sheets 8 and 8, and the ends of the reinforcing sheet 8 are connected to each other through the end portions of the steel plate 3. Therefore, since the middle pillar 10 is reinforced by the steel plate 3 and the reinforcing sheet 8, the rigidity of the steel plate 3 and the characteristics of the reinforcing sheet 8 are imparted. As a result, the earthquake resistance of the middle column 10 can be improved.
(Embodiment 2)
As shown in FIG. 6, four steel plates 3 having an L-shaped cross section are arranged at the corners of the middle pillar 10, and the connecting portions 4 provided at both ends of each steel plate 3 are connected to the connecting portions 4 of the adjacent steel plates 3. You may make it connect the connection parts 4 and 4 with the butt | matching and the fastener 16. FIG. In the second embodiment, the weight of the steel plate 3 is further reduced so that it can be easily carried into the site.

  In the above embodiment, an example is shown in which an adhesive-impregnated sheet is prepared at a factory, and this sheet is pasted on the outer surface of the steel sheet at the site. However, an adhesive-impregnated sheet is pasted on the outer surface of the steel sheet at the factory. Alternatively, a composite material in which a steel plate and an adhesive impregnated sheet are laminated may be prepared, and the composite material may be carried to the site and connected to the periphery of the pillar.

  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.

1 pillar 3 steel plate 4 connecting part 8 reinforcing sheet

Claims (4)

Step to place a plurality of steel plates on the outer surface of the reinforcing target columns to surround the reinforcing target column,
A step of attaching a reinforcing sheet impregnated with an adhesive to the outer surface of the steel sheet, and a step of connecting adjacent ends of the steel sheet;
Column reinforcement method that includes Said adhesive impregnation amount of the reinforcing sheet, as is ^{250g / m 2 ~350g / m 2} , Retrofit for pillars according to claim 1 carried into the field on the Create an adhesive impregnated sheet in advance. A plurality of steel plates disposed on the outer surface of the reinforcement target column so as to surround the reinforcement target column;
A reinforcing sheet affixed to the outer surface of the steel sheet via an adhesive,
A column reinforcing structure in which the ends of the steel plates adjacent to each other are connected by a fastener directly or via the ends of the reinforcing sheet. Reinforcing structure of pillars according to the adhesive impregnation amount of the reinforcing ^{sheet, 250g / m 2 ~350g / m} 2 and is claim 3.

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