JP2018059354A - Reinforcement structure of existing column - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcement structure of an existing column which is improved in shear reinforcement effect and at the same time deformability in the reinforcement structure of the existing column when it is difficult to apply a steel plate winding method to reinforce from four surfaces of a columnar surface of the existing column.SOLUTION: In the reinforcement structure of the existing column according to the present invention, a plurality of reinforcement materials (belt-like reinforcement plates 3) extending over three faces 1a, 1b, 1c of an outer peripheral surface of an existing column 1 of square shape in cross section and attached to the existing column 1 are provided along the extension direction of the existing column 1 at intervals.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a reinforcing structure for existing columns such as viaducts, piers, abutments and the like.

Conventionally, it is a reinforcing structure for existing pillars such as viaducts, piers, abutments, etc., and there is an obstacle such as equipment, store members, walls, etc. on one side of the pillar faces of the existing pillars, so that one surface In the reinforcement structure of an existing column when it is difficult to work from the side and it is difficult to apply the steel sheet hoisting method that reinforces the existing column from the four sides of the existing column, almost all three surfaces of the existing column There is known a reinforcement structure for an existing column in which a steel plate having a long U-shaped cross section that is long in the extending direction of the existing column is attached to the existing column so as to cover the entire surface (see Patent Document 1).
In the reinforcement structure of the existing column, a spacing holding portion is provided between the U-shaped one end of the steel plate and the column surface and between the other U-shaped end of the steel plate and the column surface. Then, the steel rod is passed through one end of the U-shape of the steel plate, the interval holding portion, the column, the interval holding portion, and the other end of the U-shape of the steel plate, and the both ends of the steel rod are tightened. By fixing with a tool, both ends of the U-shape of the steel plate are fixed to the existing columns, and a filler such as mortar is filled between the steel plate and the column surface of the existing columns, and the steel plate and the existing columns are They are integrated.

JP 2008-196288 A

However, as described later, the above-described conventional existing column reinforcing structure has been found to have a low shearing performance (toughness performance), although an effect of shearing reinforcement can be obtained by an experiment result of the present inventor.
In other words, the conventional reinforcing structure of existing columns uses a steel plate with a long U-shaped cross section that is long in the extending direction of the existing columns so as to cover almost the entire three surfaces of the existing columns. Therefore, the steel plate cannot follow the bending deformation of the existing column, the steel plate and the existing column are separated, and the effect of restraining the core concrete surrounded by the main bars in the existing column is reduced, so the deformation performance of the existing column Is considered to be low.
The present invention provides a reinforcing structure for an existing column in which the steel column hoisting method that reinforces from the four surfaces of the existing column is difficult to apply. It is to provide.

According to the reinforcement structure of the existing pillar according to the present invention, the reinforcing material that extends over the three outer peripheral surfaces of the existing pillar having a quadrangular cross section and is attached to the existing pillar is spaced along the extension direction of the existing pillar. When a force is applied to the existing column, the reinforcing members easily follow the bending of the existing column, and the deformation performance of the existing column is improved. That is, in the case where it is difficult to apply the steel sheet winding method that reinforces the four columns of the existing columns, it is possible to provide a reinforcing structure for existing columns that improves the deformation performance as well as the shear reinforcement effect.
In addition, in the extending direction of the reinforcing material extending in the circumferential direction of the existing column, the both ends of the penetrating material provided so as to penetrate the existing column and project both ends from the opposing surfaces of the outer peripheral surface of the existing column Since both ends are fixed, the core concrete of the existing column can be surrounded and restrained by the reinforcing material and the penetrating material, and the effect of leaving the core concrete is improved, and the deformation performance of the existing column is improved.
In addition, on the both-end opening side of the through hole formed in the existing column in order to allow the penetrating material to penetrate the existing column, the position is closer to the center of the existing column than the position of the streaks partly arranged in the existing column Reinforcement member that is embedded until the core concrete of the existing pillar is restrained is provided, so that the core concrete of the existing pillar can be surrounded and restrained by the reinforcement member, reinforcing material, and penetrating material, and the effect of leaving the core concrete is improved However, the decrease in the proof stress of the existing column after the maximum proof stress point of the horizontal displacement of the existing column becomes moderate, and the deformation performance of the existing column is further improved.
In addition, the reinforcing material is a strip-shaped reinforcing plate whose length along the circumferential direction of the existing column is longer than the length along the extending direction of the existing column, so the core concrete of the existing column can be restrained by the strip-shaped reinforcing plate. Thus, the effect of leaving the core concrete is improved, and the deformation performance of the existing columns is improved.

The perspective view which shows the reinforcement structure of the existing pillar. The disassembled perspective view which shows a reinforcement part. Sectional drawing which shows a reinforcement part. Sectional drawing which shows a reinforcement part. The graph which shows an experimental result. Sectional drawing which shows a reinforcement part. Sectional drawing which shows a reinforcement part.

Embodiment 1
As shown in FIG. 1, the reinforcing structure of the existing pillar according to the first embodiment is spaced along the extending direction of the existing pillar 1 having a quadrangular cross section (for example, a square, a rectangle, a parallelogram, a trapezoid, etc.). A plurality of reinforcing portions 2 are provided.

  For example, the existing column 1 can perform work on the exposed three surfaces 1a, 1b, 1c of four surfaces (column surfaces) 1a, 1b, 1c, 1d that form the outer peripheral surface of the square column. However, since obstacles 100 such as devices, store members, and walls are present on one surface (first surface) 1d side, it is a column that is difficult to work from the one surface 1d side.

  Each reinforcing portion 2 has a band-shaped reinforcing plate 3 as a reinforcing material formed in a U-shape, and fixing for fixing each end 31, 31 side of the U-shaped reinforcing plate 3 to the existing column 1. Means 4 and corner reinforcement means 5 are provided.

The strip-shaped reinforcing plate 3 is configured by forming, for example, a strip-shaped steel plate in a U shape so as to be able to face the three adjacent surfaces 1b, 1a, and 1c of the outer peripheral surface of the existing column 1.
That is, the belt-like reinforcing plate 3 is a reinforcing plate formed in a U shape by bending both ends in the extending direction of the straight belt-like steel plate so as to correspond to the outer shape of the existing pillar 1, Are arranged so as to coincide with the extending direction of the existing pillar 1.
That is, the belt-like reinforcing plate 3 is a belt-like reinforcing plate whose length along the circumferential direction of the existing column 1 is longer than the length along the extending direction of the existing column 1, and the three surfaces 1a, 1b, 1c, a pair of surfaces 1b, 1c facing each other, both ends (both ends) 31, 31 and a surface of the existing pillar 1 adjacent to the pair of surfaces 1b, 1c facing each other in parallel 1a and a central portion 32 opposite to each other, that is, the outer peripheral surface of the existing pillar 1 is provided with end portions 31 and 31 and a central portion 32 opposite to the three adjacent surfaces 1b, 1a and 1c. It is the strip | belt-shaped board in which the character shape was formed.

The band width H of the belt-like reinforcing plate 3 (width length along the extension direction of the existing pillar 1 (see FIG. 2)) is, for example, a band adjacent to each other in the extension direction of the existing pillar 1 arranged in the existing pillar 1 The thing of the length shorter than the space | interval between the stripe | line | muscle 12 (refer FIG. 3) and the strap 12 is used.
Moreover, the arrangement | positioning space | interval W of strip | belt-shaped reinforcement board 3,3 ..., ie, the direction along the extension direction of the existing pillar 1 in the strip | belt-shaped reinforcement board 3,3 adjacent to the extension direction arrange | positioned along the extension direction of the existing pillar 1. FIG. For example, the interval W between the center positions (see FIG. 1) is set to be larger than the diameter of the band 12 and 1 / 2D or less when the cross-sectional minimum diameter dimension of the existing pillar 1 is D.
Moreover, the arrangement | positioning space | interval W of strip | belt-shaped reinforcement board 3,3 ... is the arrangement | positioning of the strip reinforcements 12, 12 ... (refer FIG. 3) arranged at intervals along the extension direction of the existing pillar 1 in the existing pillar 1. As shown in FIG. Set to an integer multiple of the interval.
Moreover, the arrangement | positioning space | interval W of strip | belt-shaped reinforcement board 3,3 ... is set so that it may become narrow in the center part side of the extension direction of the existing pillar 1, for example, it is narrow in the both ends side of the extension direction of the existing pillar 1. FIG. (See FIG. 1).

As shown in FIG. 2 and FIG. 3, the fixing means 4 is laid in the existing column 1, for example, a reinforcing bar (penetrating reinforcing bar) 41 as a penetrating material called a threaded joint reinforcing bar having a screw-like node as a whole. In order to constrain core concrete (base concrete) surrounded by a plurality of main bars 11, 11,..., A reinforcing member 42 partially embedded in the existing pillar 1, a spacer 43, a bearing member 44, and a first nut 45 and the second nut 46.
The reinforcing member 42 is formed of, for example, an equilateral angle steel (angle) that is short in the extending direction of the existing pillar 1.
The spacer 43 is made of, for example, a steel plate having the same thickness as that of the equilateral mountain steel used as the reinforcing member 42.
The bearing member 44 includes, for example, a steel plate that includes a through hole 47 that allows the reinforcing bar 41 to pass therethrough and a nut accommodation hole 48 that accommodates the first nut 45 on one opening side of the through hole 47.

As shown in FIG. 2 and FIG. 3, the corner reinforcing means 5 includes a U-shaped corner of the belt-shaped reinforcing plate 3 and a corner of the existing column 1 facing the U-shaped corner of the belt-shaped reinforcing plate 3. (A boundary portion between the surface 1b and the surface 1a, and a boundary portion between the surface 1c and the surface 1a); A filler 52 such as mortar (see FIGS. 1 and 3) filled between the belt-like reinforcing plate 3 and the existing pillar 1 is provided at the corner.
The corner side spacing maintaining means 51 is formed in, for example, an equilateral shape having a long L-section in the extending direction of the existing column 1 so as to cover the corners of the existing column 1 along the extending direction of the existing column 1. A distance provided so as to protrude from the outer surface of the long material 53 attached so as to cover the long material 53 such as angle steel (angle) and the corner portion of the existing column 1 along the extending direction of the existing column 1. And forming means 54.
The space forming means 54 includes a bottom surface forming body 55 that forms a bottom surface on which the lower end surface 33 of the corner of the belt-shaped reinforcing plate 3 is placed and a bottom surface of the filler filling space, and left and right side walls of the filler filling space. The left and right side wall forming bodies 56 and 56 are formed.
The bottom surface forming body 55 is formed of, for example, a steel plate, and forms a horizontal bottom surface by being fixed to the outer surface of the long material 53 by fixing means such as welding.
Further, the side wall forming body 56 forms a side wall of the filling material filling space by fixing a flexible member such as sponge, polystyrene foam, rubber or the like to the outer surface of the long material 53 with an adhesive or the like.
The interval forming means 54 is formed on the outer surface of the long material 53 at an interval corresponding to the arrangement interval W of the belt-like reinforcing plates 3, 3 along the extending direction of the long material 53.

The construction method of the fixing means 4 and the corner | angular part reinforcement means 5 is demonstrated.
Both ends 31 of the U-shaped reinforcing plate 3 are penetrated through a reinforcing bar through hole 1h formed so as to penetrate one face 1b and the other face 1c of the existing pillar 1 corresponding to each other. The reinforcing member 42 and the spacer 43 are attached to the existing column 1 so as to penetrate the reinforcing bar 41 as a material and sandwich the one end 41a beside the one end 41a of the reinforcing bar 41 protruding outward from the one surface 1b. Then, the reinforcing member 42 and the spacer 43 are attached to the existing pillar 1 so as to sandwich the other end portion 41b beside the other end portion 41b of the reinforcing bar 41 protruding outward from the other surface 1c (see FIG. 3).
First, the reinforcing bar through-hole 1h is formed in the existing pillar 1, and the equilateral angle steel plates of the equilateral mountain-shaped steel that become the reinforcing member 42 beside the opening that opens in one surface 1b of the reinforcing bar through-hole 1h. A hole (bottomed hole) 1j (see FIG. 2) necessary for embedding one plate portion 42a (a part of the reinforcing member 42) is formed. Similarly, in order to embed one plate portion 42a out of the plate portions of the equilateral mountain-shaped steel that are orthogonal to each other and that serve as the reinforcing member 42, beside the opening portion of the reinforcing bar through hole 1h that opens to the other surface 1c of the reinforcing bar through hole 1h. A hole (bottomed hole) 1j necessary for the above is formed.
Then, in a state where the reinforcing bar 41 is passed through the reinforcing bar through hole 1h, the mortar as the filler 52 is filled in the opening side of both ends of the reinforcing bar through hole 1h and the hole 1j, and before the mortar filled in the hole 42h is dried. One plate portion 42a of equilateral angle steel is inserted into the filled mortar portion to form an insertion hole 42h (see FIGS. 2 and 3), and one plate portion 42a of equilateral angle steel before the mortar dries. Is removed from the mortar portion, and the excess mortar raised on the opening edge side of the insertion hole 42h is removed, and then one plate portion 42a of equilateral angle iron is inserted into the insertion hole 42h again to wait for the mortar to dry. As described above, the plate portion 42 a as a part of the equilateral angle steel (reinforcing member 42) is embedded inside the existing pillar 1. The plate portion 42a as a part of the equilateral angle steel is embedded to a position closer to the center of the existing column 1 than the position of the reinforcing bar 12 (see FIG. 3) arranged in the existing column 1. An inner surface (an L-shaped inner surface) of a plate portion 42b as a second portion to be described later of the reinforcing member 42 is bonded to a corresponding surface of the existing pillar 1 with, for example, an epoxy-based adhesive.
Furthermore, in a state where each spacer 43 is adhered to a corresponding surface of the existing pillar 1 with, for example, an epoxy-based adhesive, one end portion 41a of the reinforcing bar 41 protruding from between the equilateral angle steel (reinforcing member 42) and the spacer 43, and After passing the through hole 47 and the nut accommodation hole 48 of the bearing member 44 through the other end portion 41b, the first nut 45 is screwed into the one end portion 41a and the other end portion 41b of the reinforcing bar 41, respectively. The bearing member 44 is fixed to the surface 1b and the surface 1c of the existing pillar 1 by fastening 45 to the bottom of the nut accommodation hole 48, respectively. In this manner, the first nut 45 is fastened in the nut accommodation hole 48 formed by being countersunk from the surface of the bearing member 44, whereby the spacer 43 and the reinforcing member 42 are connected to the existing column via the bearing member 44. Since the first surface 1b is pressed against the surface 1c, the spacer 43 can be prevented from falling off and the operation can be performed smoothly.
The surfaces where the bearing member 44 and the spacer 43 are in contact with each other, and the surfaces where the bearing member 44 and the reinforcing member 42 are in contact with each other are bonded with, for example, an epoxy adhesive.

  Moreover, the angle | corner by which each space | interval formation means 54, 54 ... was formed in the outer surface of the elongate material 53 at intervals corresponding to the arrangement | positioning space | interval W of strip | belt-shaped reinforcement board 3,3 ... along the extension direction of the elongate material 53. The part-side spacing maintaining means 51 is manufactured in advance, and an adhesive is applied to the inner surface of the long material 53 of the corner-side spacing maintaining means 51 so that the inner surface of the long material 53 is attached to the corner of the existing column 1. By adhering to the outer surface, each corner side spacing maintaining means 51, 51 is fixed to each corner of the existing column 1.

Then, in the state where the lower end surface 33 of the U-shaped corner of the belt-shaped reinforcing plate 3 is placed on the bottom surface formed by the bottom surface forming body 55, both ends 31, 31 of the U-shaped reinforcing plate 3 are placed. After the both end portions 41a and 41b of the reinforcing bar 41 are passed through the reinforcing bar through-holes 49 and 49 formed on the reinforcing bar 41, the second nuts 46 and 46 are screwed to the both end portions 41a and 41b of the reinforcing bar 41, respectively. By fastening the second nuts 46 and 46 to the outer surfaces of the end portions 31 and 31, respectively, the U-shaped end portions 31 and 31 side of the U-shaped reinforcing plate 3 are fixed to the both end portions 41a and 41b side of the reinforcing bar 41. The belt-like reinforcing plate 3 is fixed to the existing pillar 1. In addition, the strip | belt-shaped reinforcement board 3 penetrates the both ends 41a and 41b of the reinforcing bar 41 in the reinforcing-bar through-holes 49 and 49 in the state which bent both ends 31 and 31 in the direction away from each other. In this case, since the side wall forming body 56 is formed of a flexible member, the band-shaped reinforcing plate 3 can be easily pushed into the obstacle 100 side (the surface 1d side of the existing column 1), and both ends of the reinforcing bar 41 are inserted into the reinforcing bar through holes 49 and 49. The operation of penetrating the portions 41a and 41b can be performed smoothly.
Further, the surfaces where the pressure bearing member 44 and the end portion 31 of the belt-like reinforcing plate 3 are in contact with each other are bonded with, for example, an epoxy adhesive.
And the some strip | belt-shaped reinforcement board 3 is fixed to the existing pillar 1 at intervals along the extension direction of the existing pillar 1. As shown in FIG.
As described above, the U-shaped belt-shaped reinforcing plate 3 that extends over the three surfaces 1a, 1b, and 1c of the outer peripheral surface of the existing pillar 1 having a square cross section and is attached to the existing pillar 1 is an extension of the existing pillar 1 It becomes the reinforcement structure of the existing pillar 1 provided with two or more intervals along the direction.
Further, a filler filling space surrounded by the belt-like reinforcing plate 3, the bottom surface forming body 55, and the side wall forming bodies 56, 56 is formed at the corners of the existing pillar 1, and a filling material such as mortar is formed in the filler filling space. By filling 52, the reinforcing structure of the existing pillar 1 in a state where the corner of the existing pillar 1 and the corner of the belt-like reinforcing plate 3 are integrated is obtained. In addition, when a clearance gap arises between the corner | angular part of the existing pillar 1, and the inner surface of the elongate material 53, the clearance gap 52 is filled with the fillers 52, such as mortar.
In addition, the core concrete of the existing pillar 1 has the strip-shaped reinforcing plate 3, the filler 52, the reinforcing bar 41, and a part (the plate portion 42 a) of the existing pillar 1 rather than the position of the strap 12 in which the reinforcing bars 1 are arranged in the existing pillar 1. The reinforcing structure of the existing pillar 1 is configured to be surrounded by the reinforcing portion 2 including the reinforcing member 42 embedded to a position close to the center.

  According to the reinforcement structure of the existing pillar 1 according to the first embodiment, the both ends 41 a and 41 b penetrate the existing pillar 1 and are provided so as to protrude from the surfaces 1 b and 1 c facing each other on the outer peripheral surface of the existing pillar 1. By fixing the U-shaped opposite end portions 31 and 31 side of the strip-shaped reinforcing plate 3 to the both end portions 41a and 41b side of the reinforcing bar 41 as a material, the three surfaces 1a, 1b and 1c of the outer peripheral surface of the existing column 1 are fixed. Since a plurality of U-shaped belt-like reinforcing plates 3 extending over and attached to the existing pillar 1 are provided at intervals along the extending direction of the existing pillar 1, a force is applied to the existing pillar 1. In this case, each of the belt-like reinforcing plates 3, 3... Easily follows the bending of the existing pillar 1, and the deformation performance (toughness) of the existing pillar 1 is improved. That is, in the case where it is difficult to apply the steel sheet winding method that reinforces the four columns of the existing columns, it is possible to provide a reinforcing structure for the existing columns 1 that improves the deformation performance as well as the shear reinforcement effect.

Moreover, it extends in the circumferential direction of the existing column 1 on both ends of the reinforcing bar 41 as a penetrating material provided so as to penetrate both ends of the existing column 1 and protrude from opposite surfaces of the outer peripheral surface of the existing column 1. Since both ends 31 and 31 side in the extending direction of the belt-like reinforcing plate 3 to be fixed are fixed, the core concrete of the existing pillar 1 can be surrounded and restrained by the belt-like reinforcing plate 3 and the reinforcing bar 41, and the effect of leaving the core concrete is improved. And the deformation performance of the existing pillar 1 improves.
Further, a plate portion 42a that is a part of the reinforcing member 42 is arranged in the existing column 1 at both end opening sides of the reinforcing bar through hole 1h formed in the existing column 1 in order to allow the reinforcing bar 41 to penetrate the existing column 1. By embedding the core concrete of the existing pillar 1 to a position closer to the center of the existing pillar 1 than the position of the strip reinforcement 12, the reinforcing members 42, 42, the reinforcing bars 41, the filler 52 (corner reinforcing means 5), The reinforcing part 2 provided with the belt-like reinforcing plate 3 is enclosed and restrained. That is, even when the belt-like reinforcing plate 3 cannot be provided outside the corners 1f; 1f so as to cover the corners 1f; 1f, which are both side edges of the one surface 1d where the obstacle 100 exists, The plate portion 42a, which is a part of the reinforcing member 42, is embedded to a position closer to the center of the existing column 1 than the position of the band 12 arranged in the existing column 1 on the corner 1f; 1f side of one surface 1d. As a result, the core concrete of the existing column 1 can be restrained from the corners 1f; 1f side of the one surface 1d, so that the effect of remaining the core concrete of the existing column 1 is improved and the horizontal displacement of the existing column 1 is improved. Lowering of the proof stress of the existing pillar 1 after the maximum proof stress point becomes moderate, and the deformation performance (toughness) of the existing pillar 1 is further improved.
In other words, the reinforcing method of the existing pillar 1 according to the first embodiment includes a first surface 1d where the obstacle 100 is present in the existing pillar 1 having a quadrangular section and a second surface 1b adjacent to the first surface 1d, 1c is a reinforcing method of the existing column 1 that constrains the core concrete of the existing column 1 from the corners 1f and 1f that are boundaries with 1c, from the second surfaces 1b and 1c side of the corners 1f and 1f. The reinforcing member 42 embedded up to a position closer to the center of the existing column 1 than the position of the reinforcing bar 12 arranged in the existing column 1 is used to connect the core concrete of the existing column 1 to the corners 1f and 1f side of the existing column 1 In the reinforcing structure of the existing pillar 1 according to the first embodiment, which is a reinforcing method of the existing pillar 1 that is used as a member restraining from the first pillar 1 that employs the reinforcing method, the first obstacle 100 is present. The surface 1d of the second and the second adjacent to the first surface 1d In the existing pillar 1 having a square section provided with corners 1f and 1f that are boundaries with the surfaces 1b and 1c, the bars are arranged in the existing pillar 1 from the second surfaces 1b and 1c side on the corners 1f and 1f side. Reinforcing members 42, 42 are provided to partially embed the core concrete of the existing pillar 1 from the corners 1f, 1f side of the existing pillar 1 by embedding it to a position closer to the center of the existing pillar 1 than the position of the strip 12 ing.
The reinforcing member 42 includes a plate portion 42a as a first portion embedded in the existing column 1 from the second surfaces 1b and 1c, and a plate portion 42b as a second portion extending from the plate portion 42a. And is formed of an equilateral angle steel having an L-shaped cross section. And as a 1st part which is a part of reinforcement member 42, plate part 42a is embedded to the position near the center of existing pillar 1 rather than the position of band 12 arranged in existing pillar 1, and The plate portion 42b as the second portion of the reinforcing member 42 is supported by the support means so as to be maintained in contact with the second surface 1b or the second surface 1c.
In the case of the first embodiment, the supporting means includes the reinforcing bar 41 as the penetrating material, the spacer 43, the bearing member 44 fixed to the reinforcing bar 41 by the first nut 45, the corner side interval maintaining means 51, The existing pillar 1 is formed by the belt-shaped reinforcing plate 3 that is provided to face the surfaces 1a, 1b, and 1c where the obstacle 100 does not exist and is fixed to the reinforcing bar 41 by the second nut 46. Since the plate portion 42a as the portion 1 is embedded in the vicinity of the reinforcing bar 41 along the reinforcing bar 41, the reinforcing member 42 can restrain the core concrete of the existing pillar 1 from the corner 1f side. The deformation performance (toughness) of the existing pillar 1 is further improved.
That is, in the case of the first embodiment, the supporting means is attached to the existing pillar 1 so as to extend along the extending direction of the plate portion 42a (first portion) of the reinforcing member 42 and support the reinforcing member 42. Reinforcing bars (penetrating reinforcing bars) 41 as bar members provided so that the portions 41a, 41b protrude from the second surfaces 1b, 1c of the existing pillar 1 and the second surfaces 1b, 1c of the existing pillar 1 A pressing means that is attached to both end portions 41a and 41b of the projecting reinforcing bar 41 and presses the plate portion 42b (second portion) of the reinforcing member 42 against the second surfaces 1b and 1c of the existing pillar 1; The means includes a spacer 43, a support member 44 fixed to the end of the reinforcing bar 41 by the first nut 45, and the belt-like reinforcing plate 3 fixed to the end of the reinforcing bar 41 by the second nut 46. .
Further, in the case of the first embodiment, the reinforcing member 42 is firmly supported by the supporting means, and the corners that are the boundaries between the adjacent surfaces of the three surfaces 1a, 1b, and 1c of the existing pillar 1 are corners. Since it is firmly supported by the part side space | interval maintenance means 51, the core concrete of the existing pillar 1 can be restrained from the four corners side of the existing pillar 1, and the deformation | transformation performance (toughness) of the existing pillar 1 improves more.

  Moreover, while using the strip | belt-shaped reinforcement board 3 formed in the U-shape where the length along the circumferential direction of the existing pillar 1 is longer than the length along the extension direction of the existing pillar 1 as a reinforcing material, Since the gap maintaining means 51 is used and the filler 52 such as mortar is filled between the corner of the existing pillar 1 and the corner of the belt-like reinforcing plate 3, the core concrete of the existing pillar 1 is restrained by the belt-like reinforcing plate 3. Thus, the effect of leaving the core concrete is improved, and the reinforcing structure of the existing pillar 1 is improved in which the deformation performance is improved simultaneously with the shear reinforcement effect.

Embodiment 2
In the first embodiment, the reinforcing member 42 partially embedded in the existing pillar 1 is provided. However, as shown in FIG. 4, the reinforcing member 42 may not be provided. That is, a supporting member 60 including a reinforcing bar 41 as a penetrating material, a through hole 47 through which the reinforcing bar 41 passes, and a nut accommodating hole 48 for accommodating the first nut 45 on one opening side of the through hole 47; The fixing means 4 </ b> A configured using the first nut 45 and the second nut 46 is provided.
In the case of the second embodiment, the effect of leaving the core concrete is inferior to that of the first embodiment. However, as in the first embodiment, when a force is applied to the existing pillar 1, the U-shape is bent to the existing pillar 1. The strip-shaped reinforcing plates 3, 3... Are easy to follow and the deformation performance (toughness) of the existing pillar 1 is improved.
In the second embodiment, the reinforcing member 42 is not provided, but the core concrete of the existing pillar 1 is surrounded and restrained by the reinforcing portion 2 including the belt-like reinforcing plate 3, the filler 52, and the reinforcing bar 41. Therefore, the effect of leaving the core concrete is improved, and the reinforcing structure of the existing pillar 1 is improved in which the deformation performance is improved at the same time as the shear reinforcing effect as compared with the conventional reinforcing structure.
Similarly to the first embodiment, the both ends of the reinforcing bar 41 as a penetrating material provided so as to penetrate both ends of the existing column 1 and protrude from opposite surfaces of the outer peripheral surface of the existing column 1 are provided Since both ends 31 and 31 in the extending direction of the belt-like reinforcing plate 3 extending in the circumferential direction of the pillar 1 are fixed, the core concrete of the existing pillar 1 can be bound and restrained by the belt-like reinforcing plate 3 and the reinforcing bar 41, and the core The effect of leaving the concrete is improved, and the deformation performance of the existing pillar 1 is improved. In addition, a filler 52 such as a mortar is provided between the corner of the existing pillar 1 and the corner of the belt-like reinforcing plate 3 by using the belt-like reinforcing plate 3 and the corner-side spacing maintaining means 51 formed in a U-shape. Since the core concrete of the existing pillar 1 can be constrained by the belt-like reinforcing plate 3, the effect of leaving the core concrete is improved, and the reinforcing structure of the existing pillar 1 with improved shear performance and deformation performance is provided. Become.

  Reinforcing structure according to a conventional example using a steel plate having a long U-shaped cross section that is long in the extending direction of the existing pillar 1 so as to cover almost the entire three surfaces of the existing pillar 1, as disclosed in Patent Document 1, and implementation FIG. 5 shows the results of manufacturing the reinforcing structure according to the first embodiment and the reinforcing structure according to the second embodiment and conducting a horizontal load loading experiment. In the horizontal load loading test, loading was performed with the direction in which the non-reinforcing surface 1d is on the tension side as the positive side and the direction in which the non-reinforcing surface 1d is on the compression side as the negative side.

In the conventional example, as indicated by an arrow B in FIG. 5, the result is that the proof strength of the existing column is significantly reduced and the deformation performance of the existing column is low.
That is, in the conventional example, since a steel plate having a long U-shaped cross section that is long in the extending direction of the existing column is used so as to cover almost the entire three surfaces of the existing column, the rigidity of the steel plate is increased as described above. It is considered that the steel plate cannot follow the bending deformation of the existing column and the steel plate and the existing column are separated, so the effect of restraining the core concrete of the existing column is reduced, and the deformation performance of the existing column is reduced. .

  On the other hand, in Embodiment 1 and Embodiment 2 according to the present invention, a U-shaped belt-like reinforcing plate attached to the existing column 1 extending over the three surfaces 1a, 1b, and 1c of the outer peripheral surface of the existing column 1 is provided. 3 is a reinforcement structure provided with a plurality of intervals along the extension direction of the existing pillar 1, so that each of the belt-like reinforcing plates 3, 3... Easily follows the bending of the existing pillar 1. It is considered that the effect of restraining the core concrete of the column 1 is enhanced, and the deformation performance of the existing column 1 is improved.

  Further, in the first embodiment, a part of the reinforcing member 42 is embedded to a position closer to the center of the existing pillar 1 than the position of the band 12 arranged in the existing pillar 1, and the core concrete of the existing pillar 1 is Since the reinforcing member 42, 42, the belt-like reinforcing plate 3, the filler 52, and the reinforcing portion 2 including the reinforcing bar 41 are enclosed and restrained, the effect of restraining the core concrete of the existing pillar 1 is further enhanced. As shown by the circled arrow A in FIG. 5 as compared with the second embodiment that does not include the reinforcing member 42, the effect after the maximum strength point of the horizontal displacement of the existing column 1 is improved. It has been found that the decrease in the proof stress of the existing pillar 1 is moderate and the deformation performance of the existing pillar 1 is further improved.

Embodiment 3
As shown in FIG. 6, the entire space formed between the three surfaces 1a, 1b, 1c of the existing pillar 1 and the inner surface of the U-shaped belt-like reinforcing plate 3 is filled with a filler 52 such as mortar. Also good. In this case, both ends 41a and 41b of the reinforcing bar 41 are passed through the reinforcing bar through holes 49 and 49 formed in both ends 31 and 31 of the U-shape of the reinforcing bar through-hole 1h and the belt-shaped reinforcing plate 3, and then the reinforcing bar. The nuts 61 and 61 are screwed to the both ends 41a and 41b of the 41, respectively, and the nuts 61 and 61 as fixing means are fastened to the outer surfaces of the ends 31 and 31 of the belt-like reinforcing plate 3, respectively.
Also in the third embodiment, the U-shaped belt-like reinforcing plate 3 that extends over the three surfaces 1 a, 1 b, 1 c of the outer peripheral surface of the existing pillar 1 and is attached to the existing pillar 1 is an extension of the existing pillar 1. Since a plurality of reinforcing structures are provided at intervals along the direction, each of the belt-like reinforcing plates 3, 3... Easily follows the bending of the existing pillar 1 and restrains the core concrete of the existing pillar 1. The effect is enhanced, and the reinforcing structure of the existing pillar 1 is improved in which the deformation performance is improved simultaneously with the shear reinforcement effect.
Also in the third embodiment, the existing columns 1 are provided on both ends of the reinforcing bars 41 as penetrating materials provided so as to penetrate both ends of the existing columns 1 and protrude from opposite surfaces of the outer peripheral surface of the existing columns 1. Since both ends 31 and 31 side in the extending direction of the belt-like reinforcing plate 3 extending in the circumferential direction 1 are fixed, the core concrete of the existing pillar 1 can be restrained by being surrounded by the belt-like reinforcing plate 3 and the reinforcing bar 41, and the core concrete. As a result, the deformation performance of the existing pillar 1 is improved. Further, the core concrete of the existing pillar 1 is surrounded and restrained by the reinforcing portion 2 having the belt-like reinforcing plate 3, the filler 52 and the reinforcing bar 41, and the mortar is provided between the existing pillar 1 and the belt-like reinforcing plate 3. Since the core concrete of the existing pillar 1 can be constrained by the belt-like reinforcing plate 3, the effect of leaving the core concrete is improved and the deformation performance is improved simultaneously with the shear reinforcement effect. 1 reinforcement structure.

Embodiment 4
As shown in FIG. 7, the three surfaces 1 a, 1 b, 1 c of the existing pillar 1 and the inner surface of the U-shaped band-shaped reinforcing plate 3 may be fixed with an adhesive 62.
In this case, a steel plate may be used as the belt-shaped reinforcing plate 3, but when it is difficult to make the inner surface of the steel plate follow and adhere to the three surfaces of the existing column 1, the inner surface of the belt-shaped reinforcing plate 3 is used as the existing column 1. Therefore, it is preferable to use a flexible sheet, for example, a carbon fiber sheet, as the belt-like reinforcing plate 3 in order to follow the three surfaces 1a, 1b, and 1c. Further, in this case, in order to improve the adhesion between the strip-shaped reinforcing plate 3 and the existing column 1, both end portions 41 a of the reinforcing bars 41 projecting through the both ends 31, 31 of the existing column 1 and the strip-shaped reinforcing plate 3 are provided. It is preferable to fasten the nut 61 as a fixing means to the 41b through the bearing plate 63.
Also in the fourth embodiment, the U-shaped belt-shaped reinforcing plate 3 that extends over the three surfaces 1 a, 1 b, and 1 c of the outer peripheral surface of the existing column 1 and is attached to the existing column 1 is an extension of the existing column 1. Since a plurality of reinforcing structures are provided at intervals along the direction, each of the belt-like reinforcing plates 3, 3... Easily follows the bending of the existing pillar 1 and restrains the core concrete of the existing pillar 1. The effect is enhanced, and the reinforcing structure of the existing pillar 1 is improved in the deformation performance as well as the shear reinforcing effect as compared with the conventional reinforcing structure.
Also in the fourth embodiment, the existing columns 1 are provided on both ends of the reinforcing bars 41 as penetrating materials provided so as to penetrate the existing columns 1 and project both ends from the opposing surfaces of the outer peripheral surface of the existing columns 1. Since both ends 31 and 31 side in the extending direction of the belt-like reinforcing plate 3 extending in the circumferential direction 1 are fixed, the core concrete of the existing pillar 1 can be restrained by being surrounded by the belt-like reinforcing plate 3 and the reinforcing bar 41, and the core concrete. As a result, the deformation performance of the existing pillar 1 is improved. Further, the core concrete of the existing pillar 1 is surrounded and restrained by the reinforcing portion 2 having the belt-like reinforcing plate 3 and the reinforcing bar 41, and the existing pillar 1 and the belt-like reinforcing plate 3 are bonded with the adhesive 62. The core concrete of the existing pillar 1 can be constrained by the belt-like reinforcing plate 3, and the effect of remaining the core concrete is improved, and the reinforcing structure of the existing pillar 1 is improved in which the deformation performance is improved simultaneously with the shear reinforcement effect.

In the first embodiment, an example is shown in which an equilateral angle steel (angle) that is short in the extending direction of the existing pillar 1 is used as the reinforcing member 42, but a part of the reinforcing member 42 is arranged in the existing pillar 1. Any member may be used as long as it can be embedded to a position closer to the center of the existing pillar 1 than the position of the reinforced strip 12 and can constrain the core concrete.
Moreover, in each embodiment, although the example which used the reinforcing bar 41 as a penetrating material was shown, you may use things other than the reinforcing bar 41, for example, a PC steel rod etc., as a penetrating material.
Moreover, in each embodiment, although the example which used the strip | belt-shaped reinforcement board 3 as a reinforcing material was shown, you may use the bar material formed in the U-shape, for example as a reinforcing material.

1 Existing pillars, 1a, 1b, 1c Three sides of existing pillars,
1b, 1c Existing surfaces of existing pillars, 3 strip reinforcing plates (band reinforcing material), 12 strips,
31, 31 Both ends of the belt-shaped reinforcing plate, 41 Reinforcement (penetrating material), 42 Reinforcing member,
42a A part of a reinforcing member.

Claims (4)

  An existing pillar that is provided with a plurality of reinforcing materials that are attached to the existing pillar by extending over three of the outer peripheral surfaces of the existing pillar having a quadrangular cross section at intervals along the extending direction of the existing pillar. Reinforcement structure.   Both ends of the reinforcing material extending in the circumferential direction of the existing column on both ends of the penetrating material provided so that both ends protrude from the opposing surfaces of the outer peripheral surface of the existing column through the existing column The reinforcement structure of the existing pillar according to claim 1, wherein the side is fixed.   In order to allow the penetrating material to penetrate the existing pillar, on the opening side of both ends of the through hole formed in the existing pillar, a part of the penetrating material is embedded to a position closer to the center of the existing pillar than the position of the streaks arranged in the existing pillar The reinforcing structure for an existing pillar according to claim 2, further comprising a reinforcing member for restraining the core concrete of the existing pillar.   The reinforcing material is a belt-shaped reinforcing plate whose length along the circumferential direction of the existing pillar is longer than the length along the extension direction of the existing pillar. The reinforcement structure of the existing pillar as described in 4.

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