JP5568710B2 - Building reinforcement method - Google Patents

Description

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

  Existing concrete structures (columns, beams, floors, walls, etc.) may be reinforced to improve strength such as strength and toughness in order to improve earthquake resistance. As a conventional reinforcing method, there is a method (Patent Document 1) in which mortar is applied to the surface of the casing to reinforce, or a gap between a steel plate and a casing disposed around the casing is filled with a grout material such as mortar. A construction method (Patent Document 2) is known.

JP 2010-159611 A JP 2006-063608 A

  There is a limit to the increase in strength in the conventional construction method described above, and the development of a reinforcement construction method that has seismic resistance as well as earthquake resistance is desired.

  The present invention has been made in view of the above circumstances, and a main technical problem thereof is to provide a method for reinforcing a building with improved strength and effective vibration control.

The reinforcing method for a building according to the present invention is a method of laminating a plurality of steel plates placed on the surface of an existing building, and covering the surface of the building with the laminated steel plates. A grout material filling step of filling a grout material between the surface of the building and the laminated steel plates, and a lower end and an upper end of the laminated upper and lower steel plates, Ribs that protrude in the direction of the surface and are in contact with each other in a laminated state are formed. The ribs are in direct contact with each other, or a viscoelastic member is sandwiched between the ribs. Are laminated so that they can move relative to each other in the lateral direction when subjected to vibrations caused by a predetermined force in the lateral direction .

  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 ribs of the steel plate are embedded in the grout material, the bonding strength of the steel plate to the grout material increases, and as a result, the resistance to stress such as tension and shear applied to the building is improved.

  In addition, when the lower rib of the upper steel plate and the upper rib of the lower steel plate are in contact with each other, friction is caused on the contact surfaces of the upper and lower ribs when subjected to lateral vibration due to an earthquake or the like. The frictional force at this time becomes a damper that suppresses vibration, 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.

  In addition, when the viscoelastic member is sandwiched between the lower rib of the upper steel plate and the upper rib of the lower steel plate, the upper and lower ribs are integrated by the viscoelastic member. become. And when receiving a vibration of a horizontal direction by an earthquake etc., a viscoelastic damper effect will arise by a viscoelastic member, and a 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, the said steel plate lamination process includes the form which provides a space | gap between the steel plates adjacent to a horizontal direction while arranging the said several steel plate in a horizontal direction.

  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, it is possible to improve the strength and provide an effect of providing a building reinforcement method capable of providing effective vibration control.

It is a longitudinal cross-sectional view which shows the state which reinforced the pillar by 1st Embodiment of this invention. FIG. It is a top view which shows the steel plate unit comprised with the steel plate used in 1st Embodiment, and a steel plate. It is a side view of the steel plate unit. It is a perspective view of the steel plate unit. It is the partial longitudinal cross-sectional view of the steel plate which shows the rib of a steel plate, Comprising: (a) The state which contacted the upper and lower ribs directly, (b) The state which pinched | interposed the viscoelastic member between the upper and lower ribs. 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 second embodiment of the present invention. 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 side view which shows the state which reinforced the column-beam junction part by 7th 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 8th 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. It is the (a) top view and the (b) side view which show the steel plate unit for pillars using the joint steel plate of another form. Furthermore, (a) top view and (b) side view which show the steel plate unit for pillars using the joint steel plate of another form.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[1] Reinforcement of entire column FIGS. 1 to 9 show a first embodiment in which the present invention is applied to reinforcement of an existing column. In these drawings, reference numeral 1 denotes an existing reinforced concrete column which is erected in a vertical direction having a rectangular cross section. In the present embodiment, the entire peripheral surface (four surfaces) 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 first embodiment for reinforcing the pillar 1 will be described.

  First, as shown in FIGS. 1 and 2, four reinforcing bars 21 are arranged in parallel with the pillar 1 at a predetermined distance from the pillar 1 at positions corresponding to the four corners 11 around the pillar 1. And keep that state. The reinforcing bars 21 are arranged on an extension of the diagonal line in the cross section of the column 1 and hold a standing state by a predetermined support work provided on the floor slab 2 and the beam 3, for example. The number and position of the reinforcing bars 21 are arbitrary and are selected according to the reinforcing conditions and the like.

  Next, it laminates | stacks on the 4 surfaces of the pillar 1 in the state which mounted the several steel plate 31 along those surfaces, and encloses and covers the whole surface of the internal height of the pillar 1 with these steel plates 31 (steel plate lamination process) ). As shown in FIGS. 3 to 5, the steel plate 31 in this case is formed in an L shape by bending a longitudinal intermediate portion of a rectangular material steel plate at a right angle. A steel plate unit 30A that surrounds the periphery is configured. The steel plate 31 is configured to have flat plate portions 312 on both sides of a right-angled corner portion 311, and the lengths of the plate portions 312 in the horizontal direction are equal.

  As shown in FIG. 2, the steel plate 31 has a corner portion 311 corresponding to the corner portion 11 of the column 1 and a certain distance (cover thickness) between the column 1 and the surface of the column 1 around the column 1. In this way, one steel plate unit 30A is configured. The space between the pillar 1 and the steel plate 31 is, for example, about 120 to 300 mm. A gap 45 is formed between the steel plates 31 adjacent in the lateral direction. Further, among the steel plates 31 on both sides of the gap 45, a flat joint steel plate 41 that closes the gap 45 is fixed to the inner surface of the end portion facing the gap 45 of the one side steel plate 31 by means such as spot welding. . The interval between the surface of the pillar 1 and the steel plate 31 is maintained by means such as interposing a spacer.

  As shown in FIGS. 5 and 6 (a), the upper end and the lower end of the steel plate 31 are bent at right angles to the inner side, that is, the direction of the surface of the pillar 1, and thereby a rib having a constant width that protrudes horizontally inward. 39 are formed over the entire length of the upper and lower ends. The rib 39 is formed before the steel plate 31 itself is bent into an L shape, and the rib 39 corresponds to the corner 311 of the rib 39 so that the rib 39 can be bent smoothly without overlapping each other. A notch for escape is formed in advance.

  As shown in FIG. 1, 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, as shown in FIG. 6A, the upper steel plate rib 39 is placed on the rib 39 of the lower steel plate, The ribs 39 are in direct surface contact with each other. In this way, one set of steel plate units 30A is assembled and stacked on the upper rib 39 of the lower steel plate 31 while the lower rib 39 of the upper steel plate 31 is laminated, and then the four steel plates 31 are stacked on the steel plate unit 30A. Is repeated to cover the pillar 1 with a plurality of steel plate units 30A. As shown in FIG. 2, the reinforcing bar 21 previously arranged is disposed at a right-angle inner corner of the rib 39 and is in contact with the rib 39.

  By stacking the ribs 39 on the ribs 39, the stacked state of the steel plates 31 needs to be stabilized and maintained as compared with the case where the edges of the steel plates not formed with the ribs 39 are stacked together. In some cases, the means may be simple. 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 rib 39 is, for example, about 30 to 60 mm.

  When the steel plate laminating 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. 7 (fiber sheet adhering step). 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, one long fiber sheet 51 can be continuously stretched over the plurality of steel plate units 30A while winding the fiber sheet 51 upward or downward, and the outer surface of the steel plate 20 is simultaneously wound with the impregnating adhesive. Can be adhered to.

  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.

  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.

  Next, as shown in FIG. 2, 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 mortar, cement, concrete and the like, and an appropriate one is selected. Although the steel plate unit 30A is stacked over the entire length of the inner height, a grout material filling hole is formed in the upper end portion close to the beam 3, and the grout material 61 is filled from the hole.

  Next, as shown in FIG. 7, 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-containing mortar, a fiber-containing mortar in which fibers such as carbon fiber and polyethylene fiber are cut to an appropriate length, or a mixture of these polymer-cement mortar and fiber-containing mortar, a mortar layer 72 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. 8 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. 9, 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 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 rib 39 is formed in the steel plate 1 and the rib 39 is embedded in the grout material 61, the strength of the steel plate 31 itself due to the rib effect and the bonding strength of the steel plate 31 to the grout material 61 are increased. Resistance to stress such as pulling and shearing applied to the column 1 is high.

  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 pillar 1 is reinforced with high strength. 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. 8 or FIG. 9, the fiber sheet 51 is formed by applying a fine mortar 71A on the surface of the fiber sheet 51 and forming a multilayer mortar layer 71 on which the mortar is applied on the fine mortar 71A. 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.

  Further, when a horizontal vibration is received due to an earthquake or the like, the four steel plates 31 of the steel plate unit 30A try to move independently. This is because the gap 45 is vacant between the steel plates 31, so that the lateral movement is independently possible for each steel plate 31. When the upper and lower steel plates 31 move relatively in the lateral direction, friction occurs on the contact surfaces of the upper and lower ribs 39. The frictional force at this time becomes a damper that suppresses the 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. Moreover, since it laminates | stacks, mounting the steel plate 31 on the rib 39, the lamination | stacking state of the steel plate 31 is stabilized in a steel plate lamination process, and construction can be advanced safely and promptly.

  In the above embodiment, the ribs 39 of the upper and lower steel plates 31 to be laminated are in direct contact with each other. However, as shown in FIG. 6B, a viscoelastic member 91 is sandwiched between the upper and lower ribs 39. It is good also as a state. 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 upper and lower ribs 39 are integrated by the viscoelastic member 91. And when receiving the vibration of a horizontal direction by an earthquake etc., the viscoelastic damper effect will arise by the viscoelastic member 91, and a 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.

  The said 1st Embodiment is an example which reinforces the whole surface of the pillar 1, Comprising: The basic reinforcement structure of this invention is shown. In the case of the pillar 1, reinforcement can be performed with the same structure only on the surface that needs reinforcement. 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 Example of Column Reinforcement FIG. 10 shows a second 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. 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. A gap 45 is formed between the steel plates 32, and a joint steel plate 41 that closes the gap 45 is spot welded to the inner surface of one of the steel plates 32.

  Ribs 39 are formed on the upper and lower ends of the steel plate 32 by bending the steel plate 32 at a right angle inside. Then, the steel plate units 30B are stacked by overlapping the ribs 39 so as to cover the reinforcement target surface 1a of the column 1 and the fiber sheet 51 is adhered to the surface of the steel plate 32, and the grout material to the space between the steel plate 32 and the column 1 The filling of 61 and the 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.

  FIG. 11 shows a third 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 reinforcing target surfaces 1a, and the gap 45 are provided on both sides of the steel plate 33. A combination of two L-shaped steel plates 34 each having a long plate portion 342 and a short plate portion 343 constitute a single-stage steel plate unit 30C. Each of the steel plates 33 and 34 is formed with 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 ribs 39 so as to cover the reinforcement target surface 1a of the column 1. It is constructed. 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.

  12 omits reinforcing bars 21 for reinforcement at the four corners, and the steel plate 31, the joint steel plate 41, the fiber sheet 51, and the mortar layer 71 are formed on the entire surface of the column 1 in the same manner as the example shown in FIG. The 4th Embodiment which constructed the reinforcement structure which becomes is shown. In this case, the steel plate 31 is close to the surface of the column 1 as much as the reinforcing bars 21 are not arranged, and the interval between the rib 39 and the column 1 is also narrow. For this reason, the rib 39 serves as a partition, and the space between the column 1 and the steel plate 31 is close to the state where each steel plate unit 30A is isolated. Even if the grout material 61 is filled from one place, the entire space is grouted. In some cases, the 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 FIG. 13 shows a fifth 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. 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. A gap 45 is formed between the steel plates 35, and a joint steel plate 41 that closes the gap 45 is spot welded to the inner surface of the end of one steel plate 35. The steel plate unit 30E is laminated in a plurality of stages by overlapping the ribs 39 formed on the upper and lower ends of the steel plate 35, and is constructed so as to cover the reinforcement target surface 14a. 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.

  In FIG. 13, the surface on which the pillar 1 and the sleeve wall 4 are flatly connected is the surface to be reinforced, but FIG. 14 illustrates a sixth embodiment in which the surface on which the column 1 protrudes is the surface to be reinforced 14 b. Yes. 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.

  A gap 45 is formed between the two steel plates 36 on the center side and between the steel plates 36 and the steel plates 37 on both sides, and a gap is formed on the inner surface of one of the adjacent steel plates 36 (or the steel plate 37). The joint steel plate 41 closing the 45 is spot welded. The steel plate unit 30F is constructed in such a manner that the 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 Next, with reference to FIGS. 15 to 17, the present invention is applied to a column / beam joint in which the beam 3 is orthogonally joined to the four surfaces of the column 1. A reinforced seventh embodiment will be 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 seventh embodiment, first, reinforcing reinforcing bars 21 are vertically held around the pillars 1 so as to correspond to the corners 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, the four L-shaped steel plates 31 are arranged around the pillar 1 to assemble the steel plate units 30A, and the steel plate units 30A are stacked on the upper and lower pillars 1 of the beam 3 as in the first embodiment. To do.

  Also, as shown in FIG. 16, both side surfaces of the beam 3 and the lower surface of the beam 3 are covered with a side steel plate 381 and a lower surface steel plate 382 with a space therebetween. As shown in FIG. 17, the width of the beam 3 is smaller than the width of the column 1 and the four corners 11 of the column 1 are exposed. The side steel plate 381 is disposed so as to face one of the surfaces on both sides of the corner 11 of the column 1 and the side surface of the beam 3, and the seams of the steel plates 381 and 382 corresponding to the corner 11 of the column 1. Are joined to each other by a joint steel plate 42 bent into a substantially M-shaped cross section. Then, the lower surface of the beam 3 is covered with a lower surface steel plate 382.

  A rib 39 that is laminated on the rib 39 of each steel plate 31 of the steel plate unit 30A of the column 1 is formed at the lower end of the side steel plate 381 and covered by the steel plate unit 30A that covers the lower column 1. The rib 39 is formed by bending the lower end of the side steel plate 381 inward. On the rib 39 of the steel plate 31 covering the lower column 1, the lower rib 39 of the side steel plate 381 is overlapped and laminated. Further, the 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 inserted into the beam 3 is passed through the end. A plurality of anchors 81 are inserted and fixed to the beam 3 before the side steel plate 381 is constructed.

  After constructing the steel plate unit 30A covering the pillar 1, the side steel plate 381 and the bottom steel plate 382 and covering the pillar / beam joint with these steel plates, the fiber sheet 51 is bonded to the steel plate surface, and then each steel plate and the pillar 1 and The grout material 61 is filled into the space between the beams 3, and finally, a mortar layer 71 is formed on the surface of the fiber sheet 51.

  18 to 21 show an eighth 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 to be reinforced. 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. 21), and the flat outer surface that continues from the columns 1 and 1 to the beams 3 on both sides is formed. It becomes the reinforcement object surface 13a.

  In the eighth embodiment, as shown in FIG. 19, an L-shape having a long plate portion 322 and a short plate portion 323 similar to those shown in FIG. 10 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. A gap 45 is formed between the steel plates 32, and a joint steel plate 41 that closes the gap 45 is spot welded to the inner surface of one of the steel plates 32. Ribs 39 are formed on the upper and lower ends of the steel plate 32 by bending the steel plate 32 at a right angle inside. 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. 18 and 20, on the flat outer surface (reinforcement target surface 13 a) composed of the pillar 1 and the beams 3 on both sides of the pillar 1, two upper and lower beam steel plates 383, 384 are the reinforcement target surfaces. 13a is arranged at an interval. Both ends of the upper and lower beam steel plates 383 and 384 are bent in a crank shape so as to be close to the side surface of the beam 3, and bolts 84 inserted into the beam 3 are passed through the ends. Before the beam steel plates 383 and 384 are constructed, a plurality of anchors 81 are inserted and fixed to the beam 3.

  As shown in FIG. 20, a rib 392 is formed on the upper end of the upper beam steel plate 383 by bending inward, and the rib 392 is in contact with the lower surface of the floor slab 2. In addition, the lower end of the lower beam portion steel plate 384 is bent inward to a certain depth to form a lower plate portion 394, and the inner end of the lower plate portion 394 is bent upward to form a rib 393. The rib 393 is in contact with the lower end of the side surface of the beam 3. And the rib 39 is formed in each lower end and upper end of the upper and lower beam steel plates 383 and 384, and these ribs 39 are laminated | stacked. Further, the lower plate portion 394 of the lower beam portion steel plate 384 is laminated on the rib 39 at the upper end of the steel plate 31 covering the lower column 1 of the beam 3.

  In the eighth embodiment, the steel plate unit 30A for the outer surface of the column 1 and the two upper and lower beam steel plates 383, 384 for the outer surface of the column / beam are constructed, and the fiber sheet 51 is placed on the surfaces of the steel plates 31, 383, 384. Next, the grout material 61 is filled in the space between the steel plates 31, 383, 384 and the columns 1 and 3, and finally, a mortar layer 71 is formed on the surface of the fiber sheet 51.

  In the eighth embodiment, the ribs 39 of the two upper and lower beam steel plates 383 and 384 on the outer surface of the column / beam joint are stacked and laminated, and the lower plate portion 394 of the lower beam steel plate is the steel plate 31. It will be in the state laminated | stacked on the rib 39 of the upper end. In this manner, the ribs 39 and the ribs 39 and the lower plate portion 394 are stacked so that, in this column / beam joint portion, when receiving lateral vibration, the overlapping ribs 39 and the ribs 39 are overlapped. Friction occurs on the contact surface of the lower plate portion 394, and the frictional force at this time becomes a damper that suppresses vibration, and the damping performance is effectively exhibited.

[5] Another Form of Joint Steel Sheet The joint steel sheet 41 that closes the gap 45 between the steel sheets in the above embodiment is a simple flat plate. However, as shown in FIG. The steel plate unit 30 </ b> A covered with 31 may have ribs 419 that overlap the inner surface of the rib 39 of the steel plate 31 at the upper and lower ends. In this case, there is an advantage that the gap 45 between the ribs 39 of the steel plate 31 is blocked by the ribs 419 and the strength is improved by the ribs 419 of the joint steel plate 41. Further, the stress acting on the rib 39 of the steel plate 31 is transmitted to the rib 39 of the adjacent steel plate 31 via the rib 419 of the joint steel plate 41, whereby the stress transmission is easily continued between the steel plates 31, and resistance to stress. Will improve.

  Further, as shown in FIG. 23, the plate-like steel plates 315 having sizes corresponding to the respective faces are faced to the respective faces of the pillars, and the inner surfaces of the inner corners formed by these steel plates 315 are arranged on the four faces of the pillars. The corner joint steel plates 43 having an L-shaped cross section are overlapped, and one side end of the corner joint steel plate 43 is spot welded to the inner surface of the steel plate 315 facing each other so that each steel plate 315 can be laterally moved. It is good also as a form. In this case, ribs 319 and 439 are formed on the upper and lower ends of the four steel plates 315 and the corner joint steel plate 43, respectively, and the rib 439 of the corner joint steel plate 43 is superimposed on the inner surface side of the rib 319 of the steel plate 315.

DESCRIPTION OF SYMBOLS 1 ... Column 3 ... Beam 31, 32, 33, 34, 35, 36, 37 ... Steel plate 381 ... Side surface steel plate 382 ... Bottom surface steel plate 383 ... Beam portion steel plate 384 ... Beam portion steel plate 39 ... Rib 45 ... Air gap 51 ... Fiber sheet 61 ... Grout material 71 ... Mortar layer 71A ... Fine mortar 71B ... Secondary mortar 91 ... Viscoelastic material

Claims (7)

Steel plate lamination step of laminating a plurality of steel plates along the surface with respect to the surface of the existing building, and covering the surface of the building with the laminated steel plates,
A grout material filling step of filling a grout material between the surface of the building and the laminated steel plates,
With
Ribs that protrude in the direction of the surface of the building and are in contact with each other in the laminated state are formed at the lower and upper ends of the upper and lower laminated steel plates, respectively, or the ribs are in direct contact with each other, or The viscoelastic member is sandwiched between the ribs, and the ribs are stacked so as to be movable relative to each other in the lateral direction when subjected to vibration caused by a predetermined force in the lateral direction. Reinforcement method for buildings.   The method of reinforcing a building according to claim 1, wherein the rib is formed by bending an end portion of the steel plate.   The reinforcing method for a building according to claim 1 or 2, further comprising a fiber sheet bonding step in which a fiber sheet is stretched and bonded to the surface of the laminated steel plates.   The said steel plate lamination process WHEREIN: While arranging the said several steel plate in a horizontal direction, a space | gap is provided between the steel plates adjacent to a horizontal direction, The reinforcement of the building in any one of Claims 1-3 characterized by the above-mentioned. Construction method. The method for reinforcing a building according to claim 3 , 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.   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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