JP2005155139A - Seismic reinforcing external frame construction method of existing building - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seismic reinforcing external frame construction method capable of harmonizing with the strength of the SRC structure or the SRC structural + RC structural existing building and a seismic reinforcing external frame and preventing an unreasonable stress from working on the existing building by a horizontal force to effectively control the vibration. <P>SOLUTION: The upper and lower reinforcing column unit 5 arranged at the outside of SRC structure of the existing building is united by the bolt connection or welding connection of the vertical steel frame body 12, in the precast SRC made reinforcing beam unit 6 arranged between laterally adjusting reinforcing column units 5 and the reinforced column unit 5, respective vertical steel frames 14 are connected by bolts or welding, the gap between a precast RC made reinforcing column unit and a reinforcing beam unit is connected together by the vertical PC member and the lateral PC steel member to construct an external frame. The external frame and the existing building are connected by a connection slub. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a seismic reinforced outer frame construction method in which a new reinforcing frame is constructed with a precast prestressed concrete member outside the existing building, and the existing building is joined with a shear force transmission member.

  The seismic retrofitting methods for existing buildings are broadly divided into the following (1) to (10).

 (1) Expansion of earthquake-resistant walls (construction of expansion walls, additional striking walls, opening blocking walls, sleeve (sleeve) walls, etc.). (2) Steel frame reinforcement (construct steel braces, steel plate walls, etc.). (3) External steel frame reinforcement (constructing an external brace). (4) External frame expansion reinforcement (addition of core, expansion of mega frame, expansion of buttress). (5) Reinforcement of RC winding (arrangement of welded wire mesh / hoop bars etc. on pillars). (6) Steel plate reinforcement (reinforcing columns etc. with square steel pipes, round steel plates, etc.). (7) Continuous fiber reinforcement (pillars are attached to the sheet and reinforced with molded plates). (8) Seismic isolation structure (basic isolation, underground isolation, intermediate isolation, etc.). (9) Built-in damping mechanism (AMD, TMD, metal damper, oil damper, etc.). (10) Others include avoidance of building damage concentration (improvement of Fes, improvement of wall slits, destruction mode), etc., and it is currently selected based on the use, scale, structure, usability, workability, etc. of the building .

 Among the seismic retrofitting methods (1) to (10), it is possible to reinforce an existing building in a used (residential) state (3) external steel frame reinforcement and (4) external frame expansion reinforcement. It belongs to the series (4). As this type of conventional example, there are Japanese Patent No. 3369387 (Patent Document 1), Japanese Patent Laid-Open No. 10-18639 (Patent Document 2), and the like.

The conventional outer frame method disclosed in Japanese Patent No. 3369387 and Japanese Patent Laid-Open No. 10-18639 is independent from the area where it does not interfere with the existing building, parallel to the outer periphery of the existing building, and outside the existing building. A seismic frame consisting of a flat frame located in the center or a three-dimensional frame with no floor is constructed so that the seismic frame shares the horizontal force, so that structural improvements to existing buildings are not required. This is to avoid stress concentration on the frame of the existing building.
Japanese Patent No. 3369387 JP-A-10-18639

  Among the high-rise buildings that are to be reinforced by the outer frame, there are many SRC structures (steel-framed reinforced concrete structures) or lower-layer SRC structures and upper-layer RC structures (reinforced concrete structures).

  According to the research of the present inventor, when performing seismic reinforcement of such an SRC structure or a lower-layer SRC structure with an upper-layer RC structure, a precast PC structure is used rather than a conventional outer frame method in which steel is assembled into a truss. It is reasonable to perform seismic reinforcement with the outer frame, especially if the existing building is SRC (steel reinforced concrete), the reinforcement frame is also precast SRC, and the existing building is RC (reinforced concrete). For example, if the existing frame is a lower layer SRC structure and an upper layer RC structure (reinforced concrete structure), the outer frame is also a lower layer precast SRC structure, and the upper frame precast PC structure is used. However, the strength of the existing building and the outer frame can be harmonized against the shaking at the time of the earthquake, and the existing building is subjected to excessive stress. The suppressing of existing buildings damaged by suppressing, and was found to be efficient damping can reasonably.

  The present invention was devised from the above viewpoint. As an outer frame seismic reinforcement method adapted to the structure of an existing building, a precast SRC column and beam are used for an SRC structure, and an upper layer RC structure is used. In addition, precast PC columns and beams were installed outside the existing verandas and corridors, and placed on the existing frame (existing beams), and then placed under the post-installed anchor (chemical anchor) and the existing slab. The purpose is to provide a shear transfer method using a shear force of a chemical anchor placed on an existing beam of a shear force and an existing slab and a metal for shear transmission embedded in a new concrete slab through a concrete slab.

  In order to achieve the above object, the present invention is configured as follows.

  A first invention is a seismic reinforcement outer frame method for an existing building of SRC structure, and the outer frame is constructed by assembling a plurality of reinforcing column units and reinforcing beam units, and the reinforcing column / beam unit is an SRC of an existing building. In the outer part of the building, it is composed of precast SRC reinforced column units and SRC reinforced beam units, and the vertical and horizontal steel frames provided in each column / beam unit are joined together to integrate each other. The outer frame and the outer frame are joined by a joint slab constructed on site so that shear force can be transmitted.

  The second invention is the seismic reinforcement outer frame construction method of the existing building in which the lower layer portion is SRC structure and the upper layer portion is RC structure in the first invention, and the outer frame is constructed by assembling a plurality of reinforcing column units and reinforcing beam units. The reinforcing column / beam unit is composed of a precast SRC reinforcing column unit and an SRC reinforcing beam unit at the outer part of the SRC structure of the existing building, and the vertical steel frame provided in each column / beam unit Steel frames are joined to each other, and the RC part of the existing building is composed of pre-cast RC reinforcing column units and RC reinforcing beam units at the outer part of the RC structure. Each reinforcement column / beam unit is tensioned and integrated with steel, and the existing building and the outer frame are connected to each other so that shear force can be transmitted by a joint slab on site construction. .

  According to a third invention, in the first invention or the second invention, the vertical steel frame and the horizontal steel frame are projected from the upper and lower parts and the side part of the concrete body of the SRC reinforcing column unit, and the side part of the concrete body of the SRC reinforcing beam unit The horizontal steel frames are protruded from each other, the vertical steel frames are butted together and joined, and reinforced concrete is placed on the outside to join the upper and lower reinforcing column units, the transverse steel frames are joined together and joined, and Reinforced concrete is placed on the outside, and the lateral reinforcing column unit and the reinforcing beam unit are joined.

  According to a fourth invention, in the second invention, the upper and lower RC reinforcing column units are tensioned and joined together by a vertical PC steel material vertically penetrating the concrete body of the RC reinforcing column unit. The RC reinforcing column unit and the RC reinforcing column unit are tensioned and joined and integrated by a horizontal PC steel material penetrating the concrete body of the reinforcing beam unit in the horizontal direction.

  In the fifth invention, instead of the RC reinforcing column unit and the RC reinforcing beam unit in the second invention, the reinforcing column unit is composed of a precast (PCa) reinforcing column unit and a precast (PCa) reinforcing beam unit. The beam unit is tensioned and integrated through connecting bars protruding from each member, and joint concrete is placed around it, and shear force can be transmitted between the existing building and the outer frame with a joint slab on site. It is characterized by being joined.

  According to a sixth invention, in the first to fifth inventions, the joining slab is constructed by concrete placement by site construction.

  In a seventh invention, in the first invention to the fifth invention, the joint slab is constructed by installing a post-construction anchor on a beam portion of an existing building and placing concrete, or introducing pre-stress into the concrete with PC steel. It is constructed by crimping the existing building and the outer frame.

  According to an eighth aspect of the invention, in the first to fifth aspects of the invention, the joining slab is constructed by placing concrete on the upper part of a precast plate also used as a formwork provided integrally with an outer frame.

In a ninth invention, in the first invention to the fifth invention, the joining slab is formed by placing concrete on the upper side or the lower side of an existing slab such as a veranda, a corridor, or a fence provided in an existing building, It joins so that shearing force can be transmitted through.

  According to the present invention, compared with the conventional outer frame reinforcement method of existing buildings that are made by assembling steel trusses, the outer frame made of precast concrete is seismic reinforced, so that it is excellent in factory productivity, workability, appearance, etc. Especially, if the existing building is SRC structure (steel reinforced concrete structure), the reinforcement frame is also a precast SRC outer frame, and if the existing building is the lower layer SRC structure and the upper layer RC structure (reinforced concrete structure), the lower layer precast SRC Because it is made of an upper frame made of precast RC or precast concrete (PCa), strength can be harmonized between the existing building and the outer frame against the horizontal shaking of the existing building. Therefore, it is possible to effectively exert a vibration damping effect while suppressing excessive stress on the surface.

  The outer frame is installed outside the veranda or corridor of the existing building, and the existing frame (existing beam) and post-installed anchors such as post-installed anchors provided on the outer frame are joined to the existing building. Therefore, construction is easy, and there is an effect that shearing force can be transmitted between the existing building and the outer frame.

  Next, the present invention will be described in detail based on the illustrated embodiment.

  The outline of the present invention will be described. FIG. 1 is a side view of an aspect in which an outer frame 2 for seismic reinforcement is constructed outside the side surface of an existing building 1, and FIG. 2 is a plan view.

  The existing building 1 may be (1) SRC structure (steel reinforced concrete structure), (2) RC structure (reinforced concrete structure), (3) Lower layer SRC structure, and upper layer RC structure. The seismic reinforcement outer frame structure can be applied to any of (1) to (3). The existing building 1 shown in FIG. 1 is a building in which the lower layer 3 is SRC and the upper layer 4 is RC or PC, and the outer frame 2 indicated by a black frame in FIG. The aspect which is doing is shown.

  In the present invention, the SRC lower layer 3 of the existing building 1 is reinforced by the SRC reinforcing column unit 5 and the SRC reinforcing beam unit 6 shown in FIGS. 9. Reinforcement is performed by the RC reinforcing column unit 15 and the RC reinforcing beam unit 16 shown in FIG. 10 (details will be described later). In other words, in the present invention, the existing building 1 is reinforced with SRC for the SRC structure, and the RC or PC structure is reinforced with RC, so that the existing building 1 and the outer frame 2 It is characterized by harmonizing the strength of the steel and demonstrating a smooth seismic function.

  FIG. 3 is a longitudinal side view of an existing building 1 and an outer frame 5 integrated with a joint slab 7 constructed on site, FIG. 4 is an enlarged cross-sectional view of a reinforcing foundation, and FIG. 5 is an SRC reinforcement made of precast concrete. FIG. 6 is an enlarged perspective view showing a mode in which the outer frame 2 is constructed while connecting the column unit 5 and the SRC reinforcing beam unit 6 made of precast concrete, and FIG. 6 is a view showing the joining of the SRC reinforcing column unit 5 and the SRC reinforcing beam unit 6. FIG. 7A is an enlarged view of the joint part of FIG. 6, FIG. 7B is an AA cross-sectional view of FIG. It is sectional drawing of the joint part by the joining slab 7 for horizontal shearing force transmission with the SRC reinforcement beam unit 6. FIG.

  FIG. 9 shows an aspect in which the upper part of the outer frame 2 is constructed while the RC reinforcing column unit 15 made of precast concrete and the RC reinforcing beam unit 16 also made of precast concrete are connected by the vertical PC steel material 8 and the horizontal PC steel material 10. FIG. 10 is an enlarged perspective view, and FIG. 10 is a front view showing a cross section of a joint between the SRC reinforcing column unit 5 and the RC reinforcing column unit 15 at the boundary between the SRC reinforcing column / beam portion and the RC reinforcing column / beam portion of the outer frame 2. 11 is an enlarged view of the joint portion (B) of FIG. 10, and FIG. 12 is a cross-sectional view of a joint portion of the existing building 1 and the RC reinforcing beam unit 16 by the joint slab 7 for transmitting a horizontal shearing force.

  FIG. 13 is a partially longitudinal side view showing the vicinity of the upper end portion of the vertical PC steel material 8 and the vicinity of the intermediate joint, FIG. 14A is a longitudinal front view showing the vicinity of one end portion of the horizontal PC steel material 10, and FIG. It is a vertical front view which shows the state which performed the rust prevention process.

  An outline of the construction mode of the outer frame 2 will be described. As shown in FIGS. 3 and 4, the reinforcement foundation 13 is constructed in the vicinity of the outside of the existing building 1. Next, the SRC reinforcement column unit 5 corresponding to the SRC construction by the steel frame 11 and the reinforced concrete of the lower layer part of the existing building 1 is sequentially added upward from the lowest stage with a predetermined interval in the reinforcement foundation part 13. As for the joining means, a plurality of SRC reinforcing column units 5 in the upper and lower stages are joined together by welding or bolts with the vertical steel frame 12 (FIG. 5) embedded in the thick part of the SRC reinforcing column unit 5 to construct the SRC reinforcing column 5a. To do. The SRC reinforcing column unit 5 is installed by hanging it with a crane.

  After installing a plurality of lowermost SRC reinforcing column units 5 at intervals in the horizontal direction, the SRC reinforcing beam units 6 are suspended between adjacent SRC reinforcing column units 5 by a crane and held at a predetermined height position. The horizontal steel frame 14 (FIG. 5) inserted in the horizontal direction through the thick portions of the SRC reinforcing beam unit 6 and the SRC reinforcing column unit 5 is abutted and welded or joined by bolts, and the SRC reinforcing beam 6a is provided for each of the upper and lower stages. Build up.

  If the seismic reinforcement of the lower layer part of the SRC structure in the existing building 1 is finished, the seismic reinforcement of the upper layer part of the RC structure is performed next. At this time, the RC reinforcing column unit 15 corresponding to the RC structure of the existing building 1 is sequentially added upward to the upper portion of the SRC reinforcing column 5. The plurality of upper and lower RC reinforcing column units 15 are joined together by the vertical PC steel material 8 (FIG. 9) inserted through the thick part of the units to construct the RC reinforcing column 15a as a whole. The RC reinforcing column unit 15 is installed by hanging it with a crane.

  While installing the RC reinforcing column units 15 at intervals in the horizontal direction, the RC reinforcing beam unit 16 is suspended by a crane and held at a predetermined height position between adjacent RC reinforcing column units 15, and its meat The thick portion is joined by the horizontal PC steel material 10 inserted in the horizontal direction, and the RC reinforcing column unit 15 and the RC reinforcing beam unit 16 are integrally joined to each of the upper and lower stages to construct the RC reinforcing beam 6a.

  After the plurality of SRC reinforcing column units 5 and the SRC reinforcing beam units 6 and the RC reinforcing column unit 15 and the RC reinforcing beam unit 16 which are installed in the vertical and horizontal directions as described above are joined to form the outer frame 2, The frame 5 and the existing building 1 are joined by a joining slab 7 (FIG. 12) for transmitting horizontal shearing force to complete the seismic reinforcement of the existing building 1.

  The structure of each part will be described in more detail.

  With reference to FIG. 3 and FIG. 4, the structural form of the reinforcement base part 13 is demonstrated. The existing building 1 is a reinforced concrete apartment house such as a mid-to-high-rise building, and a foundation pile 19 such as a reinforced concrete pile is spaced in the horizontal direction on the ground 18 so as to be close to the outer wall 17, and in parallel with the existing building 1. The new foundation 22 is provided on the upper part of the foundation pile 19. The new foundation 22 may be a direct foundation by omitting the foundation pile 19 and appropriately including whether it is a cloth foundation or an independent foundation depending on the ground conditions and whether the existing building 1 is a low-rise / medium-high rise. Is set. A foundation beam 23 made of precast steel reinforced concrete (SRC structure) in which a horizontal steel frame 14 such as an H-shaped steel is arranged on a new foundation 22 is placed. On the SRC foundation beam 23, the lowermost SRC reinforcing column unit 5 is vertically built with an interval. The lower end of the vertical steel frame 12 arranged in the SRC reinforcing column unit 5 is joined to the horizontal steel frame 14 of the SRC foundation beam 23 by welding or bolts. The exposed portions of the vertical and horizontal steel frames 12 and 14 to be joined to each other are covered with the in-situ bonded reinforced concrete 20.

  Further, in FIG. 4, a reinforced concrete soil slab 21 is constructed between the SRC foundation beam 23 and the existing building 1, and a foundation joint slab 24 made of cast-in-place concrete is constructed on the top. The base joint slab 24 is, for example, a post-installed structure in which a joint rebar 26 is fixed to an insert fitting 25 installed in the field construction on the SRC foundation beam 23 side, and a horizontal hole is formed on the existing building 1 side. An anchor bar (chemical anchor) 27 is connected, and a connecting bar 28 is arranged between the two reinforcing bars 26 and 27, and then the concrete is constructed on site. And via this foundation part joining slab 24, between the SRC foundation beam 23 and the existing building 1, it couple | bonds so that the shearing force by a horizontal force can be transmitted. On the upper surface of the SRC foundation beam 23, the lowest SRC reinforcing column unit 5 described above is built in parallel with the outer surface of the existing building 1.

  As shown in FIG. 5, inside the concrete of the SRC reinforcing column unit 5, a vertical steel frame 12 and a horizontal steel frame 14 made of H-shaped steel are formed in a cross shape by welding. Both ends of the steel frame 14 are protruded by predetermined dimensions from the upper and lower ends and both ends of the reinforced concrete main body 29 for welding or bolting operations between other columns and beam units.

  Then, as shown in FIGS. 5 and 6, the upper end of the vertical steel frame 12 protruding above the lower SRC reinforcing column unit 5 and the lower end of the vertical steel frame 12 protruding below the upper SRC reinforcing column unit 5 are provided. The joining plate 32 is applied across both the upper and lower flanges of the two vertical steel frames 12 across the butting portion 31, and the two vertical steel frames 12 are joined by the bolts 33 inserted through the joint portions. Then, the part exposed from the concrete main body of both the vertical steel frames 12 is coat | covered with the in-situ reinforced concrete 34. FIG. Further, the end of the horizontal steel frame 14 of the SRC reinforcing column unit 5 and the end of the horizontal steel frame 12 of the SRC reinforcing beam unit 6 are abutted, and the upper and lower surfaces of the upper and lower flanges of both horizontal steel frames 14 are sandwiched across the butted portion 31. The joining plate 32 is applied, and both the transverse steel frames 14 are joined by the bolts 33 inserted through the joining portion. Then, the part exposed from the concrete main body of both horizontal steel frames 14 is coat | covered with the in-situ reinforced concrete 34. FIG.

  The existing building 1 and the SRC reinforcing beam unit 6 are joined by a joining slab 7 made of cast-in-place concrete, for example, as shown in FIG. In the figure, the rising portion 41 of the existing slab 35 such as a veranda or a corridor provided in the existing building 1 is disassembled, and a concrete placement hole 36 is opened in the existing slab 35, and a joint is formed from the beam 37 side of the existing building 1. The joint slab 7 is constructed by extending the reinforcing bar 38, extending the joint reinforcing bar 39 from the SRC reinforcing beam unit 6, and driving the cast-in-place concrete 40 from the driving hole 36 so as to embed both joint reinforcing bars 38 and 39. . The means for constructing the joint slab 7 is an example, and it is possible to construct the joint slab by an on-site concrete method other than the above.

  The order of construction for assembling each stage of the SRC reinforcing column unit 5 and the SRC reinforcing beam unit 6 may be carried out by selecting an optimum construction procedure at the site.

  Next, with reference to FIG. 9 and subsequent figures, a joint structure between the RC reinforcing column unit 15 and the RC reinforcing beam unit 16 will be described. The RC reinforcing column unit 15 has a longitudinal insertion hole 42 and a transverse insertion hole 43 formed by embedding the longitudinal sheath and the transverse sheath while shifting the position in the thickness direction inside the cross section of the thickness. The horizontal PC steel material 10 is inserted and penetrated vertically and horizontally. The RC reinforcing beam unit 16 allows the horizontal PC steel material 10 to be inserted into a horizontal insertion hole 43 formed by embedding a horizontal sheath in the cross section of the thickness. The vertical PC steel member 8 joins the upper and lower RC reinforcing column units 15 to each other, and the horizontal PC steel member 10 joins the reinforcing column unit 15 and the RC reinforcing beam unit 16 in the lateral direction.

  The joining of the SRC reinforcing column unit 5 positioned at the uppermost part on the SRC reinforcing side and the RC reinforcing column unit 15 positioned at the lowermost side on the RC reinforcing side is performed by means shown in FIGS. 9 and 10, for example. In each figure, the joining plate 44 is welded to the upper end of the vertical steel frame 12 protruding from the concrete portion of the uppermost SRC reinforcing column unit 5. Then, the end portion of the vertical PC steel member 8 protruding from the concrete of the RC reinforcing column unit 15 at the bottom is inserted into the insertion hole opened in the joining plate 44, and the nut 45 is screwed into the screw portion at the tip of the vertical PC steel member 8, By fastening from the lower surface of the joining plate 44, the SRC reinforcing column unit 5 and the RC reinforcing column unit 15 can be joined. Thereafter, the exposed portion of the vertical steel frame 12 is covered with the cast-in-place reinforced concrete 34.

  As shown in FIGS. 9 and 10, the RC reinforcement column unit 15 at the lowermost stage is hung down by using a heavy machine such as a crane, and the adjacent RC reinforcement columns are installed while being joined and built in the SRC reinforcement column unit 5 at the uppermost stage. The RC reinforcing beam unit 16 is suspended between the units 16, is laid on the projecting portion 15 b of the RC reinforcing column unit 15, and the horizontal PC steel material 10 is inserted into the insertion hole 43 of each unit to be integrated with tension. When the RC reinforcing column unit 15 and the RC reinforcing beam unit 16 in the lowermost row are finished, the second RC reinforcing column unit 15 and the RC reinforcing beam unit 16 are installed. Thereafter, the process is repeated and the RC reinforcing column unit 15 and the RC reinforcing beam unit 16 are assembled and integrated with the vertical PC steel material 8 and the horizontal PC steel material 10.

  An example in which the upper and lower RC reinforcing column units 15 are added by a plurality of vertical PC steel members 8 will be described with reference to FIG. A vertical PC steel material 88 is inserted into the vertical insertion hole 42 formed by the sheath 46 in the RC reinforcing column unit 15, and a coupler 47 is interposed in the vertical PC steel material 8 to be added above the new vertical PC steel material 8. A height adjusting mortar 48 is appropriately provided on the upper end surface of the RC reinforcing column unit 6. The vertical PC steel 8 is tension-fixed by a fixing bracket 49 such as a nut. The upper end portion of the vertical PC steel material 8 inserted through the uppermost RC reinforcing column unit 16 is in a state where the entire vertical PC steel material 8 is tensioned to a predetermined value by a tension device (not shown). As shown in the figure, a fixing metal fitting 49 such as a nut engaged with the upper surface in the recess 50 at the upper end of the vertical PC steel 8 is fixed, and the anticorrosion treatment is performed by the anticorrosion material 51 filled in the recess 50.

  Further, as shown in FIGS. 14A and 14B, the end portion of the horizontal PC steel material 10 is fixed by a fixing metal fitting 49 such as a nut in the recess portion 50 on the side surface of the end RC reinforcing column unit 15 e. 50 is filled with an anticorrosive material 51 such as mortar and embedded, and subjected to rust prevention treatment.

  The construction sequence for assembling the steps of the RC reinforcing column unit 15 and the RC reinforcing beam unit 16 and the construction procedure for introducing the prestress by inserting the vertical PC steel material 8 and the transverse PC steel material 10 into these are the optimum construction procedures in the field. You may choose to implement.

  As shown in FIG. 12, the RC reinforcing beam unit 16 and the existing building 1 are joined by, for example, a joint slab 7 made of cast-in-place concrete. In the example of the figure, the rising portion 41 of the existing slab 35 such as a veranda or a corridor provided in the existing building 1 is dismantled, and a concrete placement hole 36 is opened in the existing slab 35, and the beam 37 side of the existing building 1 is opened. The joint rebar 38 is extended from the RC reinforcing beam unit 16, and the joint reinforcing bar 39 is extended from the RC reinforcing beam unit 16. To construct. The means for constructing the joint slab 7 is an example, and the joint slab may be constructed by a construction method other than the above-described in-situ concrete. For example, the joint slab may be constructed by placing the cast-in-place concrete 40 integrally with the RC reinforcing beam unit 16 using a precast plate that also serves as a formwork. Further, a PC steel material may be inserted into the joint slab so as to introduce prestress into the joint slab using the RC reinforcing beam unit 16 and the existing building 1 as a fixing portion.

The SRC reinforcing column unit 5, the SRC reinforcing beam unit 6, a precast concrete (PCa) reinforcing column unit, and a PC reinforcing beam unit (both not shown) may be used to form a reinforcing outer frame. . In this case, connecting bars may be formed by projecting connecting bars from each column / beam unit, connecting the pillars / beam units to each other via the connecting bars, and placing joint concrete around them.

It is a side view of the existing building which reinforced the lower layer part of the building with the outer frame concerning the present invention. It is a top view of FIG. It is a vertical side view which integrated the existing building and the outer frame. It is an expanded sectional view of the reinforcement base part of FIG. It is an expansion perspective view which shows the aspect which couple | bonds the SRC reinforcement pillar unit made from precast concrete, and an SRC reinforcement beam unit, and construct | assembles an outer frame. It is a front view which joined the SRC reinforcement pillar unit and the SRC reinforcement beam unit, and shows a joint part with a section. (A) is an enlarged view of the joint part of FIG. 6, (b) is AA sectional drawing of the figure (a). It is sectional drawing which shows the connection part by the joining slab for horizontal shearing force transmission of the beam of SRC structure of an existing building, and the reinforcement beam unit made from SRC. It is an expansion perspective view which shows the aspect which couple | bonds the RC reinforcement pillar unit and RC reinforcement beam unit made from precast concrete, and construct | assembles an outer frame. It is a front view which joined RC reinforcement pillar unit and RC reinforcement beam unit, and shows a joint part with a section. FIG. 11 is a partially enlarged view of FIG. 10. It is sectional drawing which shows the connection part by the joining slab for horizontal shearing force transmission of the RC beam and RC reinforcement beam unit of the existing building. It is a partially vertical side view showing the vicinity of the upper end portion of the vertical PC steel material and the vicinity of the intermediate joint. (A) is the longitudinal front view which shows the one end part vicinity of a horizontal PC steel material, (b) is a longitudinal front view which shows the state which performed the antirust process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Existing building 2 Outer frame 3 Lower layer part 4 Building upper layer part 5 SRC reinforcement pillar unit 5a SRC reinforcement pillar 6 SRC reinforcement beam unit 6a SRC reinforcement beam 6b Business trip part
7 Bonded slab 8 Vertical PC steel 10 Horizontal PC steel
DESCRIPTION OF SYMBOLS 11 Steel frame 12 Vertical steel frame 13 Reinforcement foundation part 14 Horizontal steel frame 15 RC reinforcement pillar unit 15a RC reinforcement pillar 16 RC reinforcement beam unit 16a RC reinforcement beam 17 Outer wall 18 Ground 20 Junction reinforced concrete 21 Soil slab 22 New foundation beam 23 SRC foundation beam 24 Foundation joint slab 25 Insert metal fitting 26 Joint reinforcement 27 Post-construction anchor 28 Joint reinforcement 29 Reinforced concrete main body 30 Reinforced concrete main body 31 Butting part 32 Joint plate 33 Bolt 34 In-situ reinforced concrete 35 Existing slab 36 Concrete placement hole 37 Beam 38 in existing building Joint reinforcing bar 39 Joint reinforcing bar 40 Cast-in-place concrete 41 Standing part 42 Vertical insertion hole 43 Horizontal insertion hole 44 Joining plate 45 Nut 46 Sheath 47 Coupler 48 Height adjustment mortar 49 Fixing bracket 50 Recess

Claims (9)

A seismic reinforcement outer frame method for an existing building of SRC structure, wherein the outer frame is constructed by assembling a plurality of reinforcing column units and reinforcing beam units, and the reinforcing column / beam unit is located at the outer part of the SRC structure of the existing building. In addition to the precast SRC reinforced column unit and SRC reinforced beam unit, the vertical and horizontal steel frames provided in each column / beam unit are joined together to integrate the existing building and the outer frame. A construction method for an anti-seismic reinforced outer frame, characterized in that shearing force can be transmitted with a joint slab on site. It is a seismic reinforcement outer frame method for an existing building whose lower layer part is SRC and upper layer part is RC. The outer frame is constructed by assembling a plurality of reinforcing column units and reinforcing beam units. The outer part of the SRC structure of the existing building is composed of precast SRC reinforced column units and SRC reinforced beam units, and the vertical and horizontal steel frames provided in each column / beam unit are joined together to integrate each other. The outer part of the RC building of the existing building is composed of precast RC reinforced column units and RC reinforced beam units, and each column and beam unit is made up of vertical PC steel and horizontal PC steel inserted through each interior. The construction method of the seismic reinforced outer frame is characterized by the fact that the existing building and the outer frame are joined to each other so that shearing force can be transmitted with a joint slab on site. A vertical steel frame and a horizontal steel frame protrude from the upper and lower parts and sides of the concrete body of the SRC reinforcing column unit, and a horizontal steel frame protrudes from the side of the concrete body of the SRC reinforcing beam unit, and the vertical steel frames are brought into contact with each other. Reinforced concrete is placed on the outside and the upper and lower reinforcing column units are joined, the horizontal steel frames are butted against each other, and the reinforced concrete is placed on the outside to reinforce the lateral reinforcing column unit. The construction method of an outer frame for seismic reinforcement according to claim 1 or 2, wherein the reinforcing beam unit and the reinforcing beam unit are joined. The vertical RC steel column that vertically penetrates the concrete body of the RC reinforcing column unit is joined and integrated by tensioning the upper and lower RC reinforcing column units, and the concrete body of the RC reinforcing column unit and the RC reinforcing beam unit are laterally arranged. The construction method of the seismic reinforcement outer frame according to claim 2, wherein the RC reinforcing column unit and the RC reinforcing column unit are tensioned and joined together by a transverse PC steel material penetrating therethrough. It is a seismic reinforcement outer frame method for an existing building whose lower layer part is SRC and upper layer part is RC. The outer frame is constructed by assembling a plurality of reinforcing column units and reinforcing beam units. The outer part of the SRC structure of the existing building is composed of precast SRC reinforced column units and SRC reinforced beam units, and the vertical and horizontal steel frames provided in each column / beam unit are joined together to integrate each other. In the existing building, the RC part is composed of precast (PCa) reinforced column units and precast (PCa) reinforced beam units, and each reinforced column / beam unit is protruded from each member. Tension integration is performed through the muscles, and joint concrete is placed around it, and shear force can be transmitted between the existing building and the outer frame using a joint slab on site. Construction method of seismic retrofitting outer frame, characterized in that joined to. The construction method for an outer frame of seismic reinforcement according to any one of claims 1 to 5, wherein the joining slab is constructed by concrete placement by site construction. The joint slab is constructed by installing a post-installed anchor on the beam part of an existing building and placing concrete, or by introducing prestress to the concrete with PC steel and crimping the existing building and the outer frame. The construction method for an outer frame of seismic reinforcement according to any one of claims 1 to 5. The seismic reinforced outer frame according to any one of claims 1 to 5, wherein the joining slab is constructed by placing concrete on an upper part of a precast plate also used as a formwork provided integrally with the outer frame. Construction method. The joining slab is characterized in that concrete is placed on the upper side or the lower side of an existing slab such as a veranda, a corridor, or a fence provided in an existing building, and is joined so as to be able to transmit a shearing force through a shear transmission hardware. The construction method of the seismic reinforcement outer frame in any one of Claims 1-5.

Images