JP2013181332A - Reinforcing method for building structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcing method for a building structure which can improve strength and toughness with effective earthquake resistance and damping performance.SOLUTION: In a reinforcing method, a plurality of steel plates 31 are faced each other on surfaces of an existing column (building structure) 1 so that the column 1 is surrounded. Then, spaces between the surfaces of the column 1 and the laminated steel plates 31 are filled with grout materials 61, longitudinal ribs 391 projecting inward and extending in a vertical direction are formed in side edges of the adjacent steel plates 31, so that the longitudinal ribs 391 are overlapped each other to be contacted. Connection strength of the steel plates 31 to the grout materials 61 are enhanced via the longitudinal ribs 391. The longitudinal ribs 391 are contacted each other so as to restrain the movement of the steel plates 31 in a horizontal direction and improve earthquake resistance or the like.

Description

  The present invention mainly relates to a method for reinforcing a building for reinforcing a concrete structure such as a building.

  The existing concrete building frames (columns, beams, floors, walls, etc.) may be reinforced to improve strength and toughness in order to improve earthquake resistance. As a conventional reinforcing method, a method of reinforcing mortar by applying mortar to the surface of the casing (Patent Document 1), or reinforcing a grout material such as mortar between the steel plate and the casing disposed around the casing. A construction method (Patent Document 2) is known.

JP 2010-159611 A JP 2006-063608 A

  The above-mentioned conventional method has a limit in increasing strength and toughness, and the development of a reinforcing method having seismic control as well as earthquake resistance has been desired.

  The present invention has been made in view of the above circumstances, and its main technical problem is to improve the strength and toughness and to provide a method for reinforcing a building having effective seismic resistance and vibration control. There is to do.

  The reinforcing method for a building according to the present invention includes a steel plate arranging step of covering a plurality of steel plates facing a surface of an existing building in a horizontal direction along the surface, and a surface of the building. And a grout material filling step for filling a grout material between the steel plates, and vertically extending in the vertical direction projecting toward the building side at side edges adjacent to each other in the horizontal direction of the plurality of steel plates. Ribs are formed, and in the steel plate arranging step, adjacent vertical ribs are made to face each other.

  According to the present invention, the steel plate is fixed to and integrated with the surface of the building via the grout material, thereby reinforcing the structure. When the longitudinal ribs of the steel plate are embedded in the grout material, the bonding strength at which the grout material and the steel plate are integrated increases, and as a result, the resistance to stress such as tension and shear applied to the building increases. In addition, the movement of the steel plates in the horizontal direction is constrained by the vertical ribs facing each other, which increases the resistance to the horizontal direction of the building after reinforcement, resulting in improved earthquake resistance. Is planned.

  In the present invention, the adjacent vertical ribs are in a state where they are in direct contact with each other, in a separated state, or in a state where a viscoelastic member is sandwiched between the vertical ribs. .

  In a state where the vertical ribs are in direct contact with each other, friction is generated on the contact surface when subjected to vibrations in the vertical direction or the horizontal direction due to an earthquake or the like. In the separated state, the grout material enters the gaps between the vertical ribs, and friction occurs between the vertical ribs and the grout material. When these frictions occur, the frictional force becomes a damper that suppresses vibrations, and the damping performance is effectively exhibited. For this reason, it is possible to obtain an effect of suppressing the shaking quickly by reducing the shaking or reducing the shaking.

  Further, when the viscoelastic member is sandwiched between the longitudinal ribs, the longitudinal rib is integrated with the viscoelastic member. And when it receives the vibration of an up-down direction or a horizontal direction by an earthquake etc., a viscoelastic damper effect will arise by a viscoelastic member, and the damping property will be exhibited effectively. For this reason, the effect which attenuates a shake and suppresses a shake quickly, or makes a shake small is acquired.

  In this invention, the said rib contains the form formed by bending the edge part of the said steel plate.

  Moreover, in this invention, the form which has a fiber sheet adhesion process which stretches | bonds and adheres a fiber sheet to the surface of the laminated said steel plate is included.

  Moreover, in this invention, it has the mortar construction process which apply | coats mortar as a finishing material on the surface of the said fiber sheet stretched on the surface of the steel plate by the said fiber sheet adhesion process.

  Moreover, in this invention, in the said mortar construction process, the primary mortar construction process which apply | coats the fine mortar in which the containing cement is a fine particle form to the surface of the said fiber sheet, and apply | coats a secondary mortar to the surface of this fine mortar. The method for reinforcing a building according to claim 5, wherein a secondary mortar construction step is performed.

  In the present invention, the secondary mortar includes a polymer cement mortar, a fiber-containing mortar, or a mixture of the polymer cement mortar and the fiber-containing mortar.

  According to the present invention, the strength and toughness are improved, and an effect is provided that a method for reinforcing a building having effective earthquake resistance and vibration control is provided.

It is a perspective view which shows the state which reinforced the pillar by 1st Embodiment of this invention. FIG. It is a cross-sectional view which shows the state which reinforced the column with the steel plate of the modification. It is a partial longitudinal cross-sectional view of the steel plate which shows each longitudinal rib of an adjacent steel plate, (a) The state which separated each longitudinal rib, (b) The state which pinched | interposed the viscoelastic member between each longitudinal rib. It is a longitudinal cross-sectional view which shows the state which strengthened the pillar by 2nd Embodiment of this invention. FIG. It is a perspective view which shows the steel plate unit comprised with the steel plate and steel plate used by 1st Embodiment. It is a cross-sectional view of the steel plate unit, (a) a disassembled state, (b) an assembled state. It is a side view of the steel plate unit. It is sectional drawing which shows the basic form of the coating layer which consists of a fiber sheet provided on the surface of a steel plate, and a mortar layer. It is sectional drawing which shows another form of the mortar layer of the same coating layer. It is sectional drawing which shows another form of the mortar layer of the same coating layer. It is a cross-sectional view showing a third embodiment of the present invention. It is a cross-sectional view showing a fourth embodiment of the present invention. It is a cross-sectional view showing a fifth embodiment of the present invention. It is a cross-sectional view showing a sixth embodiment of the present invention. It is a cross-sectional view showing a seventh embodiment of the present invention. It is a side view which shows the state which reinforced the column and beam junction part by 8th Embodiment of this invention. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is a side view which shows the state which reinforced the column and beam junction part by 9th Embodiment of this invention. It is CC sectional drawing of FIG. It is DD sectional drawing of FIG. It is EE sectional drawing of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[1] Full reinforcement of pillar [1-1] First embodiment FIGS. 1 and 2 show a first embodiment in which an existing pillar is reinforced by a reinforcement method of the present invention. In these drawings, reference numeral 1 indicates a part of an existing reinforced concrete column that is erected in a vertical direction having a rectangular cross section. In this embodiment, the entire peripheral surface (four surfaces) of the pillar 1 is a surface to be reinforced.

  At positions corresponding to the four corners 11 around the pillar 1, reinforcing reinforcing bars 21 are erected in parallel with the pillar 1 at predetermined intervals. The reinforcing bar 21 is arranged on an extension of the diagonal line in the cross section of the column 1 and holds the standing state by a support work or the like not shown in the figure. The number and position of the reinforcing bars 21 are arbitrary and are selected according to the reinforcing conditions and the like.

  Around the column 1 and outside the reinforcing bar 21, a plurality of steel plates 31 face each other in parallel with a certain interval (cover thickness) with respect to each surface of the column 1, and horizontally so as to surround the column 1 Are arranged. The steel plate 31 is formed by bending an intermediate portion in the longitudinal direction of a rectangular steel plate at a right angle to form an L shape, and a steel plate unit 30 </ b> A that surrounds the entire circumference of the column 1 with a set of four sheets. The space between the pillar 1 and the steel plate 31 is, for example, about 120 to 300 mm. When reinforcement is required over the entire length of the column 1, the steel plate units 30 </ b> A are stacked from below along the entire length of the column 1 and are provided in a plurality of stages.

  The steel plate 31 has plate portions 312 having the same length on both sides of a right-angled corner portion 311, and longitudinal ribs 391 having a constant width projecting inward, that is, on the column 1 side, are formed on the side edges of both ends. Is formed. The vertical ribs 391 are formed by bending the side edges of the steel plate 31 at a right angle. In the arranging step of arranging the steel plates 31 around the pillars 1, the vertical ribs 391 of the adjacent steel plates 31 are directly overlapped and brought into contact with each other. ) Is not superimposed. The adjacent vertical ribs 391 may be left as they are as long as they are in contact with each other, but may be temporarily fixed with clips, bolts, or the like to the extent that they can slide with each other. In addition, the thickness of the steel plate 31 is, for example, about 1.6 to 3.2 mm, the height is, for example, about 300 to 600 mm, and the width of the vertical rib 391 is, for example, about 20 to 100 mm.

  A fiber sheet 51 is stretched and bonded to the surface of the steel plate 31. In order to bond the fiber sheet 51, a technique in which a continuous fiber sheet processed into a strip shape is impregnated with an adhesive is wound around the steel plate unit 30A while applying tension. In this way, the single long fiber sheet 51 can be easily stretched over the entire surface of the steel plate unit 30A, and can be bonded to the outer surface of the steel plate 20 at the same time as being wound by the impregnating adhesive.

  Examples of the fiber material of the fiber sheet 51 include polyethylene, carbon, glass, vinylon, aramid, and the like, and polyethylene and carbon excellent in alkali resistance are preferable.

  As shown in FIG. 2, a grout material 61 is filled in the steel plate unit 30 </ b> A, that is, between the surface of the column 1 and the steel plate 31. Examples of the grout material 61 include non-shrinkable mortar, cement, concrete, and the like, and an appropriate one is selected. FIG. 2 shows a state before the grout material 61 is filled.

  The reinforcing structure of the pillar 1 according to the first embodiment is as described above. This reinforcing structure arranges the reinforcing bars 21 around the pillar 1 and then arranges the steel plates 31 while abutting the vertical ribs 391 around the pillar 1. The column 1 is surrounded by the steel plate 31 (steel plate arranging step), and then the fiber sheet 51 is stretched and bonded to the surface of the steel plate 31 (fiber sheet adhering step). Thereafter, the grout is formed between the surface of the column 1 and the steel plate. It is obtained by a method of filling the material 61 (grouting material filling step).

  The above is the reinforcing method of the first embodiment, and according to this embodiment, the steel plate 31 is fixed to and integrated with the surface of the pillar 1 via the grout material 61, whereby the pillar 1 is reinforced. . Since the steel plate 1 is formed with vertical ribs 391, and the two vertical ribs 391 are stacked in the grout material 61, the strength of the steel plate 31 itself due to the rib effect, the grout material 61 and the steel plate 31 are The bond strength to be integrated is increased, and as a result, resistance to stress such as pulling and shearing applied to the column 1 is increased. Further, since the longitudinal ribs 391 increase the rigidity in the out-of-plane direction of the steel plate 31, the resistance to the internal pressure due to the filling of the grout material 61 is high, and deformation of the steel plate 31 is suppressed. As a result, when the steel plate 31 is supported by a supporting work, the number of supporting works can be reduced, and the workability can be improved.

  Moreover, the vertical ribs 391 of the adjacent steel plates 31 are opposed to each other, and in this case, the movement of the steel plates 31 in the horizontal direction is restrained by direct contact. For this reason, the resistance force to the horizontal direction of the pillar 1 after reinforcement increases, As a result, improvement in earthquake resistance is achieved. On the other hand, when subjected to vibration in the vertical direction or horizontal direction due to an earthquake or the like, the contact surfaces of the vertical ribs 391 that come into contact slide to generate friction, and the frictional force at this time becomes a damper that suppresses vibration, Seismic control is demonstrated effectively. For this reason, it is possible to obtain an effect of suppressing the shaking quickly by reducing the shaking or reducing the shaking.

  Further, stress such as tension and shear is transmitted to the fiber sheet 51 through the grout material 61. The fiber sheet 51 has a high resistance to such stress, and may have a tensile strength that is, for example, about 10 times or more that of the steel plate 31. For this reason, the column 1 is reinforced with high strength and toughness.

  Further, when constructing, by constituting one steel plate unit 31A surrounding the column 1 with a plurality of (in this case, four) steel plates 31, the weight per one steel plate is reduced, and therefore the steel plates 31 are transported. It is also possible to reduce the burden for carrying out the construction and improve the workability, and to increase the thickness of the steel plate 31 to further increase the rigidity.

[1-2] Modified Example of Steel Plate The steel plate 31 is bent in an L shape, and vertical ribs 391 extending in the vertical direction are formed on the side edges of both ends. The steel plate of the present invention has such a shape. For example, a steel plate 31 as shown in FIG. 3 is also included. The steel plate 31 is mainly a flat plate portion having a width covering each of the four surfaces of the column 1, and vertical ribs 391 extending in the vertical direction are provided on the side edges of both ends of the plate portion on the column 1 side. It protrudes. In this case, the vertical rib 391 is bent at an angle of 45 ° with respect to the plate portion, and around the pillar 1, four steel plates 31 are arranged with the vertical ribs 391 in contact with each other. The tip of 391 is close to the reinforcing bar 21.

  In the above embodiment, the adjacent vertical ribs 391 are in direct contact with each other, but the vertical ribs 391 may be separated as shown in FIG. In this case, the grout material 61 also enters the gap between the vertical ribs 391. In this embodiment, friction is generated between the vertical ribs 391 and the grout material 61 to provide a damper that suppresses vibrations, and the damping performance is effectively exhibited.

  Further, as shown in FIG. 4B, a viscoelastic member 91 may be sandwiched between the longitudinal ribs 391. As the viscoelastic member 91, for example, a material made of rubber such as natural rubber or synthetic rubber is used. In this case, the vertical ribs 391 are integrated by the viscoelastic member 91. When receiving vibration due to an earthquake or the like, a viscoelastic damper effect is generated by the viscoelastic member 91, and the damping performance is effectively exhibited. For this reason, the effect which attenuates a shake and suppresses a shake quickly, or makes a shake small is acquired.

[1-3] Second Embodiment FIGS. 5 to 12 show a second embodiment in which the present invention is applied to reinforcement of an existing column 1. In the present embodiment, the entire circumferential surface of the column 1 is a surface to be reinforced, and is reinforced over the entire length of the internal height between the floor slab 2 and the beam 3. Hereinafter, the reinforcing method of the second embodiment for reinforcing the pillar 1 will be described.

  First, as shown in FIG. 5 and FIG. 6, reinforcing reinforcing bars 21 are erected in parallel with the pillar 1 at positions corresponding to the four corners 11 around the pillar 1 in the same manner as in the first embodiment. Keep state.

  Next, it laminates | stacks in the state which mounted the several steel plate 31 along those surfaces with respect to four surfaces of the pillar 1, and surrounds and covers the whole surface of the internal height of the pillar 1 with these steel plates 31 (steel plate arrangement | sequence process) ). As shown in FIGS. 7 to 9, the steel plate 31 has vertical ribs 391 formed on the side edges at both ends in the same manner as in the first embodiment, and is further bent at the upper and lower ends at a right angle inside. A horizontal rib 39 protruding horizontally is formed. The horizontal rib 39 has the same width as the vertical rib 391. The lateral rib 39 is formed before the steel plate 31 itself is bent into an L shape, and the corner rib 311 is formed on the corner portion 311 of the transverse rib 39 in order to be able to bend smoothly without overlapping the rib portions 39 at the corner portion 311. A notch for escape is formed in advance at the corresponding location.

  As shown in FIG. 5, a plurality of stages (four stages in the illustrated example) are stacked around the pillar 1 to cover the entire surface of the pillar 1. The lamination of the steel plate unit 30A is performed by first assembling one set of steel plate units 30A with the four steel plates 31 on the floor slab 2 to cover the lower end of the pillar 1, and then laminating the steel plate 31 on the assembled steel plate unit 30A. However, the second, third,... Steel plate units 30A are sequentially stacked.

  When laminating the steel plate 31 on the steel plate 31, the upper and lower horizontal ribs 39 are in direct surface contact with each other, with the horizontal ribs 39 of the upper steel plate placed on the horizontal ribs 39 of the lower steel plate. It is assumed that Further, the vertical ribs 391 of the steel plates 31 adjacent to each other are brought into contact with each other, and temporarily fixed as described above as necessary. In this way, a pair of steel plate units 30A is assembled and stacked on the horizontal ribs 39 at the upper end of the lower steel plate 31 while the horizontal ribs 39 at the lower end of the upper steel plate 31 are stacked, and then four sheets are stacked on the steel plate unit 30A. The procedure of placing the steel plate 31 is repeated to cover the column 1 with a plurality of steel plate units 30A. As shown in FIG. 6, the reinforcing bars 21 previously arranged are arranged at the inner corners at right angles to the lateral ribs 39 and are in contact with the lateral ribs 39.

  By stacking the horizontal ribs 39 on the horizontal ribs 39, the stacking of the steel plates 31 is compared with the case where the upper end of the lower steel plate not forming the horizontal ribs 39 is aligned with the lower end of the upper steel plate. When the state is stable and it is necessary to maintain the laminated state, the means may be simple.

  When the steel plate arranging step is completed as described above, the fiber sheet 51 is then stretched and bonded to the surface of the laminated steel plates 31 as shown in FIG. 10 (fiber sheet bonding step). The fiber sheet bonding step is also performed by adopting a technique in which the fiber sheet 51 is wound around the boundary between the upper and lower steel plate units 30A each time one steel plate unit 30A is stacked on the lower steel plate unit 30A. Can do. According to this method, while the laminated steel plate units 30A are held by the fiber sheets 51, the lamination of the steel plate units 30A can be advanced, and the lamination state of the steel plate units 30A can be promptly stabilized by the fiber sheets 51. Can do.

  Next, as shown in FIG. 6, the grout material 61 is filled in the laminated steel plate units 30A, that is, between the surface of the pillars 1 and the laminated steel plates 31 (grouting material filling step). Examples of the grout material 61 include non-shrinkable mortar, cement, concrete and the like. In addition, although the steel plate unit 30A is laminated over the entire length of the internal height, a hole for filling the grout material is formed in the lower end portion close to the floor slab 2, and the grout material 61 is filled from the hole, Alternatively, a grout material filling hole is formed in the upper end portion adjacent to the beam 3 and the grout material 61 is filled from the hole.

  Next, as shown in FIG. 10, mortar is applied as a finishing material to form a mortar layer 71 on the surface of the fiber sheet 51 that is wound around and adhered to the surface of each steel plate 31 of the steel plate unit 30A (mortar construction process). . In the mortar construction process, only the mortar may be constructed to an appropriate thickness. However, as shown in the illustrated example, a mortar in which the lattice mesh fiber sheet 72 is embedded in the mortar or an organic polymer is mixed. By using a polymer cement mortar, a fiber-containing mortar in which fibers such as carbon fiber or polyethylene fiber are cut to an appropriate length, or a mixture of these polymer cement mortar and fiber-containing mortar, a mortar layer 71 is used. This is preferable because the strength of the is improved.

  In addition, the mortar layer 71 includes a primary mortar construction process in which fine mortar in which the cement is fine is applied to the surface of the fiber sheet 51 that is wound around and adhered to the surface of each steel plate 31 of the steel plate unit 30A. You may divide and form in two or more processes including two processes of the secondary mortar construction process which applies secondary mortar to the surface. As the secondary mortar, polymer cement mortar or fiber-containing mortar, or a mixture of these polymer cement mortar and fiber-containing mortar can be used.

  FIG. 11 shows an example, in which fine mortar 71A and secondary mortar 71B are sequentially applied to the surface of fiber sheet 51 to form mortar layer 71. The fine mortar 71A is a mortar whose average particle size of the contained cement is finer than a normal one, and the contained cement has an average particle size of 20 μm or less, preferably 10 μm or less, more preferably 2 to 5 μm. You may use the polymer cement mortar which mixed the organic polymer in this fine mortar 71A. The thickness of the fine mortar 71A is, for example, about 1 to 3 mm, and the total thickness of the mortar layer 71 is, for example, about 10 to 30 mm.

  Further, as shown in FIG. 12, after applying fine mortar 71A to the surface of the fiber sheet 51, and then applying the undercoat mortar 71C, the surface of the undercoat mortar 71C has a grid-like mesh fiber sheet in the fine mortar. A mortar 71D in which 72 is embedded is applied. As this fine mortar 71D, polymer cement mortar may be used. And finally, you may take the process of constructing top coat mortar 71E.

  The above is the reinforcing method of the second embodiment, and according to this embodiment, the steel plate 31 is fixed to and integrated with the surface of the pillar 1 via the grout material 61, whereby the pillar 1 is reinforced. . In the steel plate 1, vertical ribs 391 are formed on both side edges, and horizontal ribs 39 are formed on upper and lower end edges, and these vertical ribs 391 and horizontal ribs 39 are embedded in the grout material 61. The strength of the steel plate 31 itself and the bonding strength of the steel plate 31 to the grout material 61 are increased, and as a result, the resistance to stress such as tension and shear applied to the column 1 is increased.

  Further, stress such as tension and shear is transmitted to the fiber sheet 51 through the grout material 61. The fiber sheet 51 has a high resistance to such stress, and may have a tensile strength that is, for example, about 10 times or more that of the steel plate 31. For this reason, the column 1 is reinforced with high strength and toughness. Furthermore, since the fiber sheet 51 is reinforced by the mortar layer 71 applied to the outside, the resistance against the stress applied to the fiber sheet 51 from the outside is sufficiently strong.

  Moreover, as shown in FIG. 11 or FIG. 12, by applying fine mortar 71A to the surface of the fiber sheet 51 and forming a multi-layered mortar layer 71 that applies mortar on the fine mortar 71A, the fiber sheet 51 is formed. Bonding to the mortar with high bonding force or adhesion force through the fine mortar 71A. For this reason, the stress applied to the pillar 1 is easily propagated to the fiber sheet 51 without causing damage such as cracks in the mortar layer 71. That is, most of the stress is received by the fiber sheet 51, and this also provides a high reinforcing structure.

  In addition, when subjected to vibration in the horizontal direction due to an earthquake or the like, the steel plate unit 31A tries to move relatively in the horizontal direction, but in that case, friction occurs on the contact surface of the overlapping horizontal rib 39, This frictional force becomes a damper that suppresses vibration, and the damping performance is effectively exhibited. Further, the movement of the steel plate 31 in the horizontal direction and the vertical direction tends to be restrained by the fiber sheet 51. As a result, it is possible to obtain an effect of suppressing the shaking quickly by reducing the shaking or reducing the shaking. Further, since the steel plates 31 are stacked while placing the horizontal ribs 39 on top of each other, the steel plates 31 can be easily stacked, the stacked state is stable, and the construction can proceed safely and promptly.

  Although the said 1st Embodiment and 2nd Embodiment are the examples which reinforce the whole surface of the pillar 1, in this invention, it can reinforce only the surface which needs reinforcement of the pillar 1 with the same structure. In the present invention, the building to be reinforced is not limited to a pillar, and can be applied to reinforcement of a housing other than a pillar, such as a wall, a beam, or a floor slab. An example is shown below. In the reference drawings, the same reference numerals are given to the same constituent elements as those in the above-described embodiment or the previous embodiment, and the description will be simplified or omitted.

[2] Modified Examples of Column Reinforcement [2-1] Third Embodiment FIG. 13 shows a first embodiment in which only one surface of the column 1 is a surface to be reinforced, and the surface 1a to be reinforced is reinforced by the reinforcing method of the present invention. Three embodiments are shown. In this case, the L-shaped steel plate 32 having the long plate portion 322 and the short plate portion 323 constitutes a steel plate unit 30B by one set. The steel plates 32 of the pair of steel plate units 30B are spaced apart from the pillars 1, with the long plate portions 322 facing the reinforcement target surface 1a in parallel, and the ends of the short plate portions 323 correspond to both sides of the reinforcement target surface 1a. Arranged.

  Vertical ribs 391 extending in the vertical direction are formed on the side edges of the steel plates 32 that are abutted against each other, and the vertical ribs 391 are overlapped with each other and are in direct contact with each other. Further, at the upper end and the lower end of the steel plate 32, lateral ribs 39 are formed by bending the inner side at a right angle. Then, the steel plate units 30B are stacked by overlapping the horizontal ribs 39 so as to cover the reinforcement target surface 1a of the pillar 1, the adhesion of the fiber sheet 51 to the surface of the steel sheet 32, and the grout to the space between the steel sheet 32 and the pillar 1 Filling of the material 61 and formation of the mortar layer 71 on the surface of the fiber sheet 51 are performed in this order.

  In this case, an appropriate number of anchors 81 are inserted so as to be orthogonal to the reinforcement target surface 1 a of the pillar 1, and the heads of the anchors 81 are embedded in the grout material 61. The anchor 81 is inserted into an anchor hole drilled in the column 1 and the inserted state is fixed by an adhesive. The anchor 81 is fixed to the column 1 before the steel plate 32 is constructed. Further, the tie bar 82 is penetrated between the short plate portions 323 of the two steel plates 32 of the steel plate unit 30B, and the tie bar 82 is tightened with a nut 83 to be tightened. The tie bar 82 is also embedded in the grout material 61. It is out. The anchor 81 further strengthens the coupling of the grout material 61 to the column 1 and the coupling of the steel plate 32 and the mortar layer 71 to the column 1, and the tie bar 82 improves the horizontal restraint strength of the steel plate 32.

[2-2] Fourth Embodiment FIG. 14 shows a fourth embodiment in which two adjacent surfaces of the pillar 1 are reinforcing target surfaces 1a, and these surfaces are reinforced by the reinforcing method of the present invention. In this case, the L-shaped steel plate 33 having the same length of the two plate portions 332 corresponding to the corner portion 11a between the two reinforcement target surfaces 1a, and the long plate portions disposed on both sides of the steel plate 33 A single-stage steel plate unit 30C is configured by a combination of two L-shaped steel plates 34 each having 342 and a short plate portion 343. Vertical ribs 391 extending in the vertical direction are formed on the side edges of the steel plates 33 and 34 adjacent to each other, and the adjacent vertical ribs 391 are overlapped with each other and are in direct contact with each other. Further, both the steel plates 33 and 34 are formed with horizontal ribs 39 that overlap each other at the upper and lower ends, and the steel plate units 30C are stacked in a plurality of stages by overlapping the upper and lower horizontal ribs 39, and the reinforcement target surface of the column 1 It is constructed over 1a. Also in this case, the anchor 81 is inserted and fixed to the reinforcement target surface 1a, and the tie bar 82 penetrates the steel plate 34 corresponding to the reinforcement target surface 1a.

[2-3] Fifth Embodiment FIG. 15 omits reinforcing bars 21 for reinforcement at the four corners, and a steel plate 31 and a fiber sheet 51 are formed on the entire surface of the pillar 1 as in the example shown in FIG. And the 5th Embodiment which constructed the reinforcement structure which consists of mortar layers 71 is shown. In this case, since the reinforcing bars 21 are not arranged, the steel plate 31 is close to the surface of the column 1 and the intervals between the vertical ribs 391 and the horizontal ribs 39 and the columns 1 are narrow. For this reason, the horizontal rib 39 serves as a partition, and the space between the pillar 1 and the steel plate 31 is close to the state of being separated for each steel plate unit 30A. Even if the grout material 61 is filled from one place, the entire space is reduced. In some cases, the grout material 61 cannot be filled. Therefore, in such a case, the grout material 61 may be filled for each steel plate unit 30A.

[3] Reinforcing Example Including Column and Wall [3-1] Sixth Embodiment FIG. 16 shows a sixth embodiment in which a building in which sleeve walls 4 are continuously constructed on both sides of one surface of the column 1 is reinforced. Show. In this case, the surface where the pillar 1 and the sleeve walls 4 on both sides are continuously flat is the reinforcement target surface 14a, and the steel plate unit 30E is composed of a pair of symmetrical steel plates 35. In the steel plate 35, a bent portion 352 is formed in a crank shape so as to be close to the sleeve wall 4 at one end portion of the main plate portion 351 that is disposed flat from the pillar 1 to the sleeve wall 4 at a distance from the pillar 1. Therefore, a bolt 84 inserted into the column 1 is passed through the end of the bent portion 352.

  Vertical ribs 391 extending in the vertical direction are formed on the side edges adjacent to each other of the steel plates 35, and the vertical ribs 391 are overlapped with each other and are in direct contact with each other. The steel plate unit 30 </ b> E is laminated in a plurality of stages by overlapping the horizontal ribs 39 formed at the upper and lower ends of the steel plate 35, and is constructed so as to cover the reinforcement target surface 14 a. The anchor 81 is inserted and fixed in a portion of the reinforcement target surface 14 a corresponding to the main plate portion 351 of the left and right steel plates 35, and the anchor 81 is embedded in the grout material 61.

[3-2] Seventh Embodiment In FIG. 16, the surface on which the pillar 1 and the sleeve wall 4 are flat and continuous is used as the surface to be reinforced, but in FIG. A seventh embodiment is shown. In this case, two inner corner corners 11c formed by the two L-shaped steel plates 36 corresponding to the two outer corner corners 11b of the pillar 1 and the pillars 1 and the sleeve walls 4 are used. The two L-shaped steel plates 37 corresponding to are assembled symmetrically to constitute a steel plate unit 30F.

  Also in this case, vertical ribs 391 extending in the vertical direction are formed on the side edges of the steel plates 36 and 37 adjacent to each other, and the vertical ribs 391 are overlapped with each other and are in direct contact with each other. The steel plate unit 30F is constructed in such a manner that the horizontal ribs 39 formed on the upper and lower ends of the steel plates 36 and 37 are stacked in a plurality of stages and the reinforcing target surface 14b is covered. Bolts 84 inserted into the sleeve wall 4 are passed through the ends of the steel plates 37 on both sides. In the illustrated example, the anchor 81 embedded in the grout material 61 as described above is not inserted into the column 1, but the anchor 81 may be provided similarly.

[4] Reinforcement of Column / Beam Joint [4-1] Eighth Embodiment Next, a column / beam joint in which beams 3 are orthogonally joined to four surfaces of a column 1 with reference to FIGS. 8th Embodiment which reinforced the part by applying this invention is described. In this case, the floor slab 2 is constructed on the upper surface of the beam 3. The pillar 1, the beam 3, and the floor slab 2 are all skeletons of existing reinforced concrete structures.

  In the eighth embodiment, first, reinforcing reinforcing bars 21 are vertically held around the pillar 1 in correspondence with the corner portions 11. In particular, a spiral hoop bar 22 that passes through the bar 21 is held around the bar 21 that overlaps the beam 3. Next, as in the second embodiment, four L-shaped steel plates 31 having the vertical ribs 391 and the horizontal ribs 39 are arranged around the pillar 1 to assemble the steel plate units 30A. The steel plate unit 30 </ b> A is stacked on the pillar 1.

  In addition, as shown in FIG. 19, the side surface in which the outer surface of the joint where the column 1 and the beam 3 having a width smaller than the column 1 intersect in a cross shape is arranged with a certain interval between the column 1 and the beam 3. Cover with steel plate 381. The side steel plate 381 is fixed to the floor slab 2 with bolts 84 at the upper end along the lower surface of the floor slab 2. The lower end portion of the side steel plate 381 covering the beam 3 is bent along the lower surface of the beam 3, and the space between the tip ends thereof is closed with a joint steel plate 41 arranged on the inner side. The joint steel plate 41 is fixed to at least one side steel plate 381 by means such as spot welding. Further, as shown in FIG. 20, the lateral end of the side steel plate 381 is bent in a crank shape so as to be close to the side of the beam 3, and a bolt 84 fixed to the beam 3 is passed through the end. Is done.

  In this case, the steel sheet unit 30A and the side surface steel plate 381 that cover the column 1 are installed, the column / beam joint is covered with these steel plates, and then the fiber sheet 51 is bonded to the steel plate surface. Next, the grout material 61 is filled into the space between each steel plate and the pillar 1 and the beam 3, and finally, the mortar layer 71 is formed on the surface of the fiber sheet 51 in the pillar 1 portion to complete.

[4-2] Ninth Embodiment FIGS. 21 to 24 show a ninth embodiment in which the present invention is applied to a column / beam joint in which the beam 3 is orthogonally joined to the three surfaces of the column 1. Show. In this case, the beams 3 extending on both sides of the column 1 are constructed so as to be flush with each other on the outer surface (the lower surface in FIG. 24), and the flat outer surface connecting the columns 1 and 1 to the beams 3 on both sides is formed. It becomes the reinforcement object surface 13a.

  In the ninth embodiment, as shown in FIG. 22, an L-shape having a long plate portion 322 and a short plate portion 323 similar to those shown in FIG. 13 on the outer surface (reinforcement target surface 13 a) of the pillar 1. A steel plate unit 30 </ b> B including two steel plates 32 is provided. Vertical ribs 391 extending in the vertical direction are formed on the side edges of the steel plates 32 that are abutted against each other, and the vertical ribs 391 are overlapped with each other and are in direct contact with each other. Further, at the upper end and the lower end of the steel plate 32, lateral ribs 39 are formed by bending the inner side at a right angle. Then, the steel plate units 30 </ b> B are stacked by overlapping the ribs 39 to cover the pillar 1, and the fiber sheet 51 is bonded to the surface of the steel plate 32. The tie bar 82 is penetrated between the short plate portions 323 of the two steel plates 32, and both ends of the tie bar 82 are tightened with nuts 83 to be tightened, and the tie bar 82 is embedded in the grout material 61.

  Further, as shown in FIGS. 21 and 23, a pair of left and right beam steel plates 383 are spaced apart from the reinforcement target surface 13a on the flat outer surface (the reinforcement target surface 13a) composed of the column 1 and the beams 3 on both sides of the column 1. It is arranged in a space. Vertical ribs 391 extending in the vertical direction are formed on adjacent side edges of the beam steel plate 383, and the vertical ribs 391 are overlapped with each other and are in direct contact with each other. Further, the end of the beam portion steel plate 383 on the remote side is bent in a crank shape so as to be close to the side surface of the beam 3, and a bolt 84 fixed to the beam 3 is passed through the end portion. Before the beam steel plate 383 is constructed, a plurality of anchors 81 are inserted and fixed to the beam 3. As shown in FIG. 20, the longitudinal cross-sectional shape of the beam steel plate 383 is bent along the surfaces of the floor slab 2 and the beam 3, and the upper end side is fixed to the floor slab 2 with bolts 84.

  In the ninth embodiment, a steel plate unit 30A for the outer surface of the pillar 1 and two left and right beam steel plates 383 for the outer surfaces of the pillars and beams are constructed, and the fiber sheet 51 is bonded to the surfaces of the steel plate 31 and the beam steel plate 383. Next, the grout material 61 is filled into the space between the steel plates 31 and 383 and the columns 1 and 3, and finally, the mortar layer 71 is formed on the surface of the fiber sheet 51.

DESCRIPTION OF SYMBOLS 1 ... Column 3 ... Beam 31, 32, 33, 34, 35, 36, 37 ... Steel plate 381 ... Side surface steel plate 383 ... Beam part steel plate 391 ... Vertical rib 51 ... Fiber sheet 61 ... Grout material 71 ... Mortar layer 71A ... Fine mortar 71B ... Secondary mortar 91 ... Viscoelastic member

Claims (7)

A plurality of steel plates facing the surface of an existing building, a steel plate arrangement step of horizontally arranging the steel plates covering the surface along the surface,
A grout material filling step of filling a grout material between the surface of the building and the steel plate,
With
The side ribs adjacent to each other in the horizontal direction of the plurality of steel plates are formed with vertical ribs projecting toward the building side and extending in the substantially vertical direction. In the steel plate arranging step, the adjacent vertical ribs are opposed to each other. A method of reinforcing a building, characterized in that   The adjacent vertical ribs are in a state where they are in direct contact with each other, in a separated state, or in a state where a viscoelastic member is sandwiched between the vertical ribs. Reinforcement method for listed buildings.   The method of reinforcing a building according to claim 1, wherein the vertical rib is formed by bending a side edge of the steel plate.   The reinforcing method for a building according to any one of claims 1 to 3, further comprising a fiber sheet bonding step in which a fiber sheet is stretched and bonded to the surface of the steel plate.   The building according to any one of claims 1 to 4, further comprising a mortar construction step of applying mortar as a finishing material to the surface of the fiber sheet stretched on the surface of the steel sheet in the fiber sheet bonding step. Reinforcement construction method.   In the mortar construction process, a primary mortar construction process in which fine mortar containing fine particles of cement is applied to the surface of the fiber sheet; and a secondary mortar construction process in which secondary mortar is applied to the surface of the fine mortar; The method for reinforcing a building according to claim 5, wherein:   The method for reinforcing a building according to claim 6, wherein the secondary mortar is polymer cement mortar, fiber-containing mortar, or a mixture of these polymer cement mortar and fiber-containing mortar.

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