JP2007270511A - Reinforcement structure and steel plate for reinforcement of structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reinforcement structure capable of easily connecting a steel plate for reinforcing a structure without using site welding and to provide a steel plate for reinforcement used for the reinforcement structure. <P>SOLUTION: This steel plate for reinforcement 20A used for steel plate lining method comprises a steel plate 20A for reinforcement and a steel plate 20B for reinforcement. The steel plate 20A for reinforcement comprises a steel plate body 24 and a splice plate 25. In the steel plate body, a projecting piece 21 of generally trapezoidal shape in plan view is fitted to one of the sides in the lateral direction, a recessed part 22 of trapezoidal shape with which the projecting piece 21 is engaged is formed in the other side, and irregular parts 25M, 25N engaged with each other are formed on the sides 20c, 20d in the longitudinal direction. By using the steel plate 20A and the steel plate 20B, when the steel plates 20A are connected to each other or the steel plate 20A is connected to the steel plate 20B, the projecting piece 21 is fixedly fitted into the recessed part 22. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention assembles and winds up a plurality of reinforcing steel plates around the structure and fills the reinforcing steel plate with the mortar between the reinforcing steel plate and the structure. The present invention relates to a reinforcing structure for a structure that reinforces the structure, and a reinforcing steel plate used therefor.

Conventionally, in order to improve the earthquake resistance of reinforced concrete structures such as pillars, the steel sheets for reinforcement divided into a plurality of parts are wound around the structure to connect adjacent steel sheets, covering the outer periphery of the structure, There is known a method of reinforcing the structure by filling the gap between the rolled-up reinforcing steel sheet and the structure with an epoxy resin or mortar to integrate the structure and the reinforcing steel sheet. Yes. With this reinforcement, it is possible to effectively prevent a shear failure due to a bulging output applied in the radial direction of a structure such as a pillar during an earthquake. This method can also be applied to seismic reinforcement of existing structures.
By the way, as a method of connecting a plurality of steel plates, welding or the like is generally used. However, the connection by this welding not only takes work time, but also the workability is poor due to work in a narrow place, and therefore, the strength is high. There was a problem that a large variation was likely to occur. Therefore, as shown in FIG. 4 (a), two reinforcing steel plates 50 having U-shaped cross sections provided with joint portions 51 and 52 on both side portions 50a and 50b are prepared, and these steel plates 50 and 50 are prepared. Adjacent to each other so as to surround the entire circumference of the reinforced concrete column 10, the joint 51 provided on the side portion 50a of one reinforcing steel plate 50 and the side portion 50b of the reinforcing steel plate 50 adjacent thereto are provided. There has been proposed a method of greatly reducing welding work by overlapping and connecting and fixing the joints 52 formed. In the figure, reference numeral 30 denotes a mortar filled in the gap between the pillar 1 and the reinforcing steel plate 50.
4 (b) and 4 (c) are diagrams showing details of the connecting portion of the reinforcing steel plates 50, 50, and the side disposed on the outer surface side when the two reinforcing steel plates 50, 50 are overlapped. A through hole 51s and an uneven portion 51m are formed in the joint portion 51 provided on the side portion 50a, and the joint portion 52 provided on the side portion 50b disposed on the inner surface side includes A through-hole 52s having the same axis as the through-hole 51s and a concavo-convex portion 52m engaged with the concavo-convex portion 51m are formed. When the reinforcing steel plates 50 and 50 are connected, the concave and convex portions 51m and the concave and convex portions 52m are engaged with each other, and bolts 53 are inserted into the through holes 51s and 52s from the joint portion 52 side. The bolt 53 protruding to the outer surface side is screwed into the nut 54 and the joint portion 51 and the joint portion 52 are fastened. Thereby, the said reinforcing steel plates 50 and 50 can be connected and fixed, without performing a welding operation. In addition, about the up-down direction of the pillar 10, the side surfaces 50k of the reinforcing steel plates 50 and 50 adjoining up and down are connected and fixed by welding etc. (for example, refer patent document 1).
Japanese Patent Laid-Open No. 9-41565

  However, the conventional reinforcing steel plate 50 has a complicated structure in which concave and convex portions 51m and 52m are formed on both side portions 50a and 50b, and joint portions 51 and 52 having thicknesses different from those of the steel plate 50 are provided. Therefore, it is difficult to form by processing from a single steel plate. Therefore, it takes time and effort to manufacture the reinforcing steel plate 50 such as separately manufacturing the joint portions 51 and 52 and welding and attaching them to the steel plate body.

  The present invention has been made in view of conventional problems, and can easily connect a reinforcing steel plate that reinforces a structure without performing on-site welding, as well as preventing shear fracture due to seismic force and the structure. An object of the present invention is to provide a reinforcing structure capable of improving the toughness of the steel sheet and a reinforcing steel sheet used therefor.

In the invention according to claim 1 of the present application, a plurality of reinforcing steel plates are arranged around a structure, and adjacent steel plates are connected to cover the outer periphery of the structure, and the reinforcing steel plate and the structure In the steel sheet winding method in which the structure and the reinforcing steel plate are integrated by filling a gap between the structure and the reinforcing steel plate, the lateral side of the reinforcing steel plate is On one side, there is provided a protruding piece that protrudes in the direction of the reinforcing steel sheet adjacent to the reinforcing steel sheet and expands in width toward the reinforcing steel sheet side, and a recess in which the protruding piece is engaged with the other side. When the reinforcing steel plate is connected, the protruding piece is moved so as to face the concave portion, and is fitted into the concave portion, and the protruding piece is engaged with the concave portion. It is.
According to a second aspect of the present invention, in the steel sheet winding method for a structure according to the first aspect, an attachment plate is attached to the structure side which is the back surface side of the concave portion of the reinforcing steel sheet.
The invention according to claim 3 is the steel sheet winding method according to claim 2, wherein the protruding piece and the attachment plate are fastened by a fastening member.

According to a fourth aspect of the present invention, in the steel sheet winding method according to the first to third aspects, at least one rectangular stepped portion is provided on one of the longitudinal sides of the reinforcing steel sheet. When the first concavo-convex part is provided and the second concavo-convex part that can be engaged with the concavo-convex part is provided on the other side, and when the reinforcing steel plates are stacked in the vertical direction, the reinforcements that are adjacent vertically The first uneven portion and the second uneven portion of the steel plate for use are engaged with each other.
The invention according to claim 5 is the steel sheet winding method according to claim 4, wherein the shape of the concavo-convex portion of the reinforcing steel plate is a shape in which the same pattern is repeated a plurality of times, and the reinforcement adjacent in the vertical direction. When the steel plates are stacked in the vertical direction, the engaging positions of the protruding pieces and the recesses are shifted and stacked.

  Moreover, the invention according to claim 6 arranges a plurality of reinforcing steel plates around the structure, connects adjacent steel plates to cover the outer periphery of the structure, and also includes the reinforcing steel plate and the structure. It is a reinforcing steel plate used in a steel sheet winding method for filling a space between the curable filler and integrating the structure and the reinforcing steel plate to reinforce the structure, in the short direction of the steel plate A projecting piece that is provided on one of the side edges of the steel plate and that increases in width as it moves away from the reinforcing steel plate body, and a recess that is provided on the other side in the short direction and that engages the projecting piece. The attachment plate attached to the structure side which is the back side of the recess, and the bolt for inserting the bolt hole provided in the protruding piece for fastening the protruding piece and the attaching plate The insertion hole and the attachment plate have the same axis as the bolt hole. It is characterized in that a threaded hole that.

According to the present invention, as a reinforcing steel plate used in the steel sheet winding method, a protrusion provided on one of the lateral sides of the reinforcing steel plate, the width of which increases as the distance from the reinforcing steel plate body increases. A piece, a concave portion provided on the other side, to which the protruding piece is engaged, an attachment plate attached to a structure side which is the back side of the concave portion, and provided on the protruding piece, Reinforcement provided with a bolt insertion hole for inserting a bolt hole for fastening the protruding piece and the attachment plate, and a screw hole provided in the attachment plate and having the same axis as the bolt hole When the reinforcing steel plate is connected, the projecting piece is moved so as to face the recess, and is fitted into the recess, and the projecting piece is engaged with the recess, and then the fastening bolt is attached to the bolt. Screw into the screw hole through the hole and Since so as to fasten the spliced plate, without performing field welding, it is possible to easily connect the reinforcing steel plate to reinforce the structure.
In addition, a first concavo-convex portion having at least one rectangular stepped portion is provided on one side of the reinforcing steel plate in the longitudinal direction, and a second side that can be engaged with the concavo-convex portion on the other side. The reinforcing steel plates are stacked in the vertical direction, so that the reinforcing steel plates can be connected to each other without performing field welding in the vertical direction, and the upper and lower reinforcing steel plates can be connected to each other. Since the rectangular stepped portions are engaged with each other, it is possible to reliably prevent the reinforcing steel plate from rising due to vibration caused by seismic force and disconnecting the connecting portion.
At this time, the shape of the concavo-convex portion of the reinforcing steel plate is a shape in which the same pattern is repeated a plurality of times, and when the reinforcing steel plates adjacent in the vertical direction are stacked in the vertical direction, the relationship between the protruding piece and the concave portion is increased. If the alignment positions are shifted and stacked, the engaging portions can be arranged on a plurality of side surfaces, so that uniform reinforcement can be performed.

Hereinafter, the best mode of the present invention will be described with reference to the drawings.
1 (a) to (c) are diagrams showing a reinforcing structure of a structure by a steel sheet winding method according to the best mode of the present invention, (a) a front view, (b) a side view, (C) The figure is AA sectional drawing of (a) figure. In the figure, 10 is a reinforced concrete column having a rectangular cross-sectional shape that is an object of seismic reinforcement, 20A and 20B are reinforcing steel plates used in this method, and 30 is a gap between the reinforcing steel plate and the reinforced concrete column 10. Mortar to be filled.
The reinforcing steel plate 20A before bending is obtained by processing a single steel plate 20P as shown in FIG. 2 (a), and processing one side 20a of the lateral sides in the short direction to produce a steel plate. The protruding portion 21 having a substantially trapezoidal planar shape is provided, and the other side 20b is processed to provide the trapezoidal concave portion 22 with which the protruding piece 21 is engaged. At the same time, a flat contact plate 23 is attached to the back side of the recess 22. Further, on the side 20c in the longitudinal direction of the steel plate body 24 of the reinforcing steel plate 20A, an uneven portion 25M having a rectangular step portion 25a and a planar view wave type uneven portion 25b is formed. An uneven portion 25N that engages with the uneven portion 25M is formed on the side 20d. In addition, the uneven | corrugated shape of the said uneven | corrugated | grooved part 25M and the uneven | corrugated | grooved part 25N is a shape where the same pattern was repeated twice.
Further, the reinforcing steel plate 20B is obtained by rotating the reinforcing steel plate 20A by 180 degrees, and is the same as the reinforcing steel plate 20A. Thus, as shown in FIG. 20B can be connected along the circumferential direction of the column, and the reinforcing steel plate 20A and the reinforcing steel plate 20B, or the reinforcing steel plates 20A and 20B can be stacked in the vertical direction of the column.
Further, as shown in FIG. 2C, a counterbore 21k for inserting and fixing the head of the fixing bolt 26 is provided on the protruding piece 21 of the reinforcing steel plates 20A and 20B. A screw portion 23k for screwing the fixing bolt 26 is formed at a portion corresponding to the counterbore 21k of 23.
In this example, the two reinforcing steel plates 20A are each folded in a U-shape and arranged adjacent to each other so as to surround the entire circumference of the reinforced concrete column 10, and the protruding pieces 21 of each reinforcing steel plate 20A are provided. Is inserted into the recess 22 of the other reinforcing steel plate 20A and engaged, and then a fixing bolt 26 is screwed into the screw portion 23k formed on the attachment plate 23 of the reinforcing steel plate 20A from the protruding piece 21 side. To do. Thereby, the two reinforcing steel plates 20A and 20A can be easily connected. The two reinforcing steel plates 20B and 20B can be connected by the same operation.
In addition, you may form the protrusion piece 21, the recessed part 22, and the uneven | corrugated | grooved part 25M, 25N of the steel plate main body 24 before bending not by machining but by press etc.

Next, a method for reinforcing the reinforced concrete column 10 using the reinforcing steel plates 20A and 20B will be described.
First, a plurality of base steel plates 20C having concavo-convex portions having the same shape as the concavo-convex portions 25M and 25N of the reinforcing steel plates 20A and 20B are surrounded on the base portion (lowermost stage) around the outer periphery of the reinforced concrete column 10 The base steel plates 20 </ b> C are connected with bolts 27. At this time, a bolt insertion opening is provided in the vicinity of the connecting portion of the base steel plate 20C, and a plate-like base attachment in which a plurality of screw holes (not shown) are formed inside the base steel plate 20C (reinforced concrete column 10 side). A plate 28 is disposed, and bolts 27 are screwed into the screw holes from the base steel plate 20C side to connect and fix the plurality of base steel plates 20C.
Next, the reinforcing steel plate 20A is stacked on the upper side of the base steel plate 20C, and further, the reinforcing steel plate 20B, the reinforcing steel plate 20B, and the reinforcing steel plate 20A are sequentially stacked thereon. In this example, as shown in FIGS. 1 (a) and 1 (b), the reinforcing steel plate positioned at the lower stage and the reinforcing steel sheet positioned at the upper stage are stacked while being shifted by 90 °. Thereby, each connection part of the said steel plate 20A for reinforcement and the steel plate 20B for reinforcement, ie, the engaging part of the protrusion piece 21 and the recessed part 22, is both sides of a pillar in the 1st and 3rd steps | paragraphs except the base. On the surface side, the second and fourth steps are positioned on the front side and the back side, and the protruding pieces 21 and the concave portions appearing on one side surface can be reversed.
In the above-described stacking, it is important that the reinforcing steel plates are stacked so that there is no gap in the engagement between the concave and convex portions 25M and the concave and convex portions 25N, thereby facilitating the engagement between the protruding piece 21 and the concave portion 22. . At this time, since the rectangular step portion 25a having two sides parallel to the vertical direction, that is, having two sides perpendicular to the circumferential direction of the column is engaged, the reinforcing steel plate 20A, 20B can be reliably prevented from rising.
At this time, a spacer bolt is extended to secure a separation distance between the reinforced concrete column 10 and the reinforcing steel plates 20A and 20B.
After the completion of the stacking of the reinforcing steel plates 20A and 20B, the top steel plate 20D for attaching the plurality of top steel plates 20D is a steel plate having an uneven portion that engages with the uneven portion 25M of the uppermost reinforcing steel plate 20A on the lower side. The plurality of top steel plates 20 </ b> D are connected and fixed using a top attachment plate 29 and bolts 27, similarly to the base steel plate 20 </ b> C.
Finally, the reinforced concrete column 10 and the reinforcing steel plates 20A to 20D are integrated by filling the gap between the reinforced concrete column 10 and the reinforcing steel plates 20A to 20D with a mortar 30 that is a curable filler, and the reinforced concrete column 10 is integrated. Reinforce.

As described above, according to the best mode, a plurality of reinforcing steel plates are arranged around the existing reinforced concrete pillars 10, the adjacent steel plates are connected to cover the outer periphery of the structure, and the reinforcing steel plates When reinforcing the gap between the structure and the mortar 30 by filling the gap with the mortar 30, the width of the reinforcing steel sheet is increased toward one side 20 a of the lateral sides in the short direction as the distance from the center of the steel sheet increases. A flat trapezoidal protruding piece 21 is provided, a trapezoidal recess 22 is provided on the other side 20b, and the protruding side 21 is engaged with the side 20c, 20d in the longitudinal direction. A reinforcing steel plate 20A provided with a steel plate body 24 formed with concave and convex portions 25M and 25N to be engaged with each other, and a flat plate-like attachment plate 25 attached to the back side of the concave portion 22, and 180 of the reinforcing steel plate 20A. Rotated complement When connecting the reinforcing steel plates 20A and the reinforcing steel plates 20B along the periphery of the column using the steel plate 20B, the projecting piece 21 is inserted into the recess 22 and engaged with the fixing bolt 26. Since it is fixed, the steel plates for reinforcement 20A and 20B can be easily connected without performing on-site welding, and also has a yield strength exceeding the yield displacement amount of the rebar due to seismic force. Breakage can be reliably prevented and the toughness of the structure can be improved.
Further, since the reinforcing steel plates 20A and 20B are stacked while meshing the concave and convex portions 25M and the concave and convex portions 25N of the reinforcing steel plates 20A and 20B, the reinforcing steel plates can be connected to each other without performing on-site welding in the vertical direction. Can be connected.
Furthermore, since the steel plate body 24 of the reinforcing steel plates 20A and 20B of this example is easy to manufacture, the manufacturing cost can be reduced.

In the above-described best mode, the case where the existing reinforced concrete column 10 having a rectangular cross-sectional shape is seismically reinforced is described. However, the present invention is not limited to this and is also applicable to the reinforcement of other structures such as beams. It goes without saying that it is possible.
Moreover, in the above example, the entire circumference of the reinforced concrete column 10 is covered with the two reinforcing steel plates 20A and the two reinforcing steel plates 20B. However, depending on the size and shape of the structure, three or more are used per circle. May be.
In the above example, the reinforcing steel plates 20A and 20B are stacked in the vertical direction in the order of A-B-B-A, but as shown in FIG. 3A, as shown in A-B-A-B. May be stacked.
Moreover, as shown in FIG.3 (b), although it is also possible to cover the reinforced concrete pillar 10 only with one kind of reinforcing steel plate 20A (or reinforcing steel plate 20B), in this case, all the connection directions are the same. Therefore, in order to ensure the uniformity of strength, it is preferable to use the stacking method as in this example.

  As described above, according to the present invention, the reinforcing steel plate for reinforcing the structure can be easily connected without performing on-site welding. Therefore, the reinforcement work for the structure can be performed efficiently and easily. It is possible to prevent shear fracture due to seismic force and improve the toughness of the structure.

It is a figure which shows the reinforcement structure of the structure based on the best form of this invention. It is a figure which shows the detail of the steel plate for reinforcement which concerns on this best form. It is a figure which shows the other stacking method of the steel plate for reinforcement by this invention. It is a figure which shows the reinforcement structure of the conventional structure.

Explanation of symbols

10 reinforced concrete columns, 20A, 20B steel plates for reinforcement, 20C base steel plates,
20D top steel plate, 20P steel plate, 21 projecting piece, 21k spot facing, 22 recess,
23 Plated plate, 24 Steel plate body, 25M, 25N Concavity and convexity, 25a Rectangular step,
25b Corrugated uneven part, 25k thread part, 26 fixing bolt, 27 bolt,
28 base plate, 29 top plate, 30 mortar.

Claims (6)

  A plurality of reinforcing steel plates are arranged around the structure, and adjacent steel plates are connected to cover the outer periphery of the structure, and a space between the reinforcing steel plate and the structure is filled with a curable filler. In the steel sheet winding method in which the structure and the reinforcing steel plate are integrated to reinforce the structure, reinforcement adjacent to the reinforcing steel plate is provided on one of the lateral sides of the reinforcing steel plate. When projecting in the steel plate direction, providing a projecting piece whose width increases toward the reinforcing steel plate side, and providing a recess that engages the projecting piece on the other side, when connecting the reinforcing steel plate, A steel sheet winding method characterized in that the protruding piece is moved so as to face the concave portion, is fitted into the concave portion, and the protruding piece is engaged with the concave portion.   The steel sheet winding method according to claim 1, wherein an attachment plate is attached to a structure side which is the back side of the concave portion of the reinforcing steel plate.   The steel sheet winding method according to claim 2, wherein the protruding piece and the attachment plate are fastened by a fastening member.   A first concavo-convex portion having at least one rectangular stepped portion is provided on one of the longitudinal sides of the reinforcing steel plate, and a second side that can be engaged with the concavo-convex portion on the other side. When the reinforcing steel plates are stacked in the vertical direction, the first concave and convex portions and the second concave and convex portions of the reinforcing steel plates adjacent in the vertical direction are engaged with each other. The steel plate winding method according to claim 1.   The shape of the concavo-convex portion of the reinforcing steel plate is a shape in which the same pattern is repeated a plurality of times, and when the reinforcing steel plates adjacent in the vertical direction are stacked in the vertical direction, the engagement position between the protruding piece and the concave portion is determined. The steel sheet hoisting method according to claim 4, wherein the steel sheet hoisting method is stacked and shifted. A plurality of reinforcing steel plates are arranged around the structure, and adjacent steel plates are connected to cover the outer periphery of the structure, and a space between the reinforcing steel plate and the structure is filled with a curable filler. A steel plate for reinforcement used in a steel sheet winding method that integrates the structure and the steel plate for reinforcement and reinforces the structure, and is provided on one of the lateral sides in the short direction. Mounted on the projecting piece whose width increases as it moves away from the steel sheet body, a recess provided on the other side in the short side direction, and the structure side that is the back side of the recess. Provided in the projecting piece, provided in the projecting piece, a bolt insertion hole for inserting a bolt hole for fastening the projecting piece and the accessory plate, A screw hole having the same axis as the bolt hole is provided. Strength steel plate.

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