JP2005155138A - Seismic reinforced external frame construction method of existing building - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an external frame reinforcing construction method which can be installed even in a place having no site and no positional room from the adjacent building and does not block sunshine, can usefully use the site. <P>SOLUTION: A new foundation 2 for an external frame 5 is constructed between columns 47 of the existing building 1 at a position where it does not interfere with the existing foundation 19 and a foundation beam 3 is constructed on the new foundation 2 in site operation, a precast concrete reinforcing column unit 6 is arranged on the foundation beam 3, on the new foundation 2 to tie upwards, the precast concrete reinforcing beam unit 7 is supported at a specified level, the upper and lower reinforcing units 6 are integrated by the vertical PC steel member, the space between the horizontal reinforcing column unit 6 and reinforcing beam unit 7 is integrated by the horizontal PC steel member to construct the external frame 5. The space between the external frame 5 and the existing building 1 is connected by a connection slub so as to transmit a shearing force. <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 .

 Of the seismic reinforcement methods of (1) to (10), it is (3) external steel frame reinforcement and (4) external frame expansion reinforcement that can be reinforced in the use (residential) state of an existing building. 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 techniques disclosed in Japanese Patent No. 3369387 and Japanese Patent Laid-Open No. 10-18639 are independent of the area where they do not interfere with the existing building, are parallel to the outer periphery of the existing building, and are located outside the existing building. A seismic frame consisting of a flat frame or a three-dimensional frame without a floor is constructed so that the seismic frame shares the horizontal force. This is to avoid stress concentration on the frame of an existing building.

The outline of the prior art will be described with reference to FIGS. 11 to 13. The existing building 1 such as an elementary and junior high school or a low-rise house is constructed by combining the existing pillar 47 and the beam 40. When the existing building 1 is seismically reinforced by the outer frame 48, the new foundation 49 is constructed outside the existing foundation 19 on which the existing pillar 47 is erected, and the reinforcement pillar 50 is attached to the new foundation 49. Is constructed, and the outer frame is constructed by assembling a steel material such as a reinforcing beam 51 between adjacent reinforcing columns 50 into a truss.
Japanese Patent No. 3369387 JP-A-10-18639

  In the conventional outer frame reinforcement method, a new foundation is built outside the existing foundation of the existing building, and reinforcement columns and beams are installed. Frames will be constructed, which may be difficult to adopt if there is a problem with sunlight or the site, or if there is not enough distance from adjacent buildings. For example, in elementary and junior high schools, there are many school buildings connected by connecting corridors to form a courtyard, but this courtyard has a distance that takes into account the sunlight of the school building and classroom, and the seismic reinforcement structure is located away from the building. It is not preferable that the sunshine entering the building is reduced by being located away. Furthermore, it is not desirable that the schoolyard's courtyard becomes narrow due to the earthquake-proof reinforcement structure protruding over the courtyard, and there is a desire to use it as widely as possible.

The present invention has been proposed to solve the above-mentioned problems, and the outer frame reinforcement that can be installed in a place where the distance from the adjacent building can be effectively used while not obstructing the sunlight of the building and effectively using the site. The purpose is to provide a construction method.

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

  The first invention is a seismic reinforcement outer frame method for an existing building, wherein a new foundation of the outer frame is constructed between the columns of the existing building at a position where the foundation of the existing column is not interfered with, and the foundation on the new foundation A precast concrete reinforcing column unit is placed on the beam and added upward, and the adjacent reinforcing column unit supports the precast concrete reinforcing beam unit at a predetermined height, and the upper and lower reinforcing column units are Introducing pre-stress with the vertical PC steel material inserted into the interior and integrating the process A, and introducing horizontal pre-stress between the horizontal reinforcing column unit and the reinforcing beam unit with the horizontal PC steel material. The integration process B is performed in the order of A, B or B, A to form the outer frame, and the outer frame and the existing building are joined with a joining slab, Characterized by being adapted to transmit the time stress.

  A second invention is characterized in that, in the first invention, the joint slab is constructed of concrete cast in field construction.

  A third invention is the first or second invention, wherein the joint slab is disposed by installing a post-construction anchor on a beam portion of an existing building and placing concrete, or between the outer frame and the existing building. It is constructed by introducing pre-stress into slab concrete with PC steel.

  A fourth invention is characterized in that, in the first or second invention, the joining slab is constructed by placing concrete on an upper portion of a precast plate which is also provided integrally with an outer frame.

According to a fifth aspect of the present invention, in the first aspect, the joining slab is formed by placing concrete on an upper side or a lower side of an existing slab such as a veranda, a corridor, or a fence provided in an existing building, and a shear force is transmitted via a shear transmission hardware. It is characterized in that it is joined so that it can be transmitted.

  According to the present invention, a new column of an outer frame is constructed between existing columns of an existing building. And by constructing the new foundation in a position where it will not interfere with the existing foundation, the new foundation will not interfere with the existing foundation, so it can be built close to the existing building, and the new foundation can be built without overhanging from the existing building. A reinforced frame can be constructed. As a result, the outside frame does not interfere with the sunshine of the building, the site can be used effectively, such as the courtyard of the schoolyard, and the reinforced outside frame can be installed in places where there is not enough distance from the adjacent building. There is.

Furthermore, the outer frame is composed of precast concrete reinforced column units and reinforced beam units that are suitable for mass production in the factory and easy to carry, and these reinforced column / beam units are made of vertical PC steel and horizontal PC steel. It can be constructed efficiently by on-site construction, and the outer frame and the existing building can be joined with a joint slab constructed by on-site construction so that shear force can be transmitted.

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

  FIG. 1 is a side view of an existing building in which the seismic reinforcement outer frame construction method according to the present invention is implemented, FIG. 2 is a plan view, and FIG. 3 is a plan view showing the installation of an existing foundation of the existing building and a new foundation of an earthquake resistant reinforcement outer frame. FIG.

  In each figure, two sets of outer frames 5 for seismic reinforcement are installed on the outer sides of opposite side surfaces of the existing building 1. The new foundation 2 in each outer frame 5 is constructed on the upper part of the foundation pile 16, and the foundation beam 3 is constructed across the new foundation 2. In the present invention, as shown in FIG. 3, the foundation beam 3 is located substantially in the middle of the existing foundation 19, and is installed at a position where it does not interfere with the existing foundation 19.

  On the new foundation 2, a plurality of reinforcing column units 6 made of precast concrete are connected upward via the foundation beam 3, and are integrated by a vertical PC steel material 8 (shown in FIG. 6) to construct a reinforcing column 6a. A reinforced beam unit 7 made of precast concrete is installed between the two reinforced column units 6, and the reinforced column / beam units 6 and 7 are constructed of a horizontal PC steel material 10 (shown in FIG. 6) to form an integrated reinforced column 7a. Thus, a precast concrete seismic reinforcement outer frame 5 is constructed, and the outer frame 5 and the existing building 1 are joined to each other so as to transmit a shearing force by a joint slab (described later).

  FIG. 4 is a longitudinal side view of the existing building 1 and the outer frame 5 in an integrated state, FIG. 5 is an enlarged cross-sectional view of the reinforcing foundation 13 in FIG. 4, and FIG. 6 shows the reinforcing column unit 6 made of precast concrete. 7A and 7B are enlarged perspective views showing a state in which the vertical PC steel material 8 is added up and down and the precast concrete reinforcing beam unit 7 and the reinforcing column unit 6 are joined by the horizontal PC steel material 10. 8 (a) and 8 (b) are cross-sectional views showing four examples of joint portions of the existing building 1 and the outer frame 5 with the joining slab 11 for horizontal shear force transmission, and FIG. 10 is a partially longitudinal side view showing the vicinity of the upper end and the intermediate joint, FIG. 10A is a longitudinal front view showing the vicinity of one end of the horizontal PC steel material 10, and FIG. It is a front view.

  Explaining the outline of the construction procedure of the present invention, as shown in FIG. 1 and FIG. 3, the foundation pile 16 is located close to the outside of the existing building 1 and does not interfere with the existing foundation 19 between the existing columns 47, A reinforced foundation 13 composed of a new foundation 2, a foundation beam 3, etc. is constructed. Next, in the upper part of the new foundation 2, the reinforcing column unit 6 is added to the foundation beam 3 sequentially from the bottom to the upper part, and the vertical PC steel material 8 (FIG. 6) that passes through the thick part of the reinforcing column unit 6 A plurality of reinforcing column units 6 are combined to construct a reinforcing column 6a. The reinforcing column unit 6 is installed by hanging it with a crane.

  After the plurality of lowermost reinforcing column units 6 are thus installed at intervals in the lateral direction, the reinforcing beam unit 7 is suspended by a crane and positioned and supported at a predetermined height by the adjacent reinforcing column units 6. Next, the reinforcing column unit 6 and the reinforcing beam unit 7 are integrally joined to each of the upper and lower stages by a horizontal PC steel material 10 that is inserted through the thick portions of the reinforcing beam unit 7 and the reinforcing column unit 6 in the horizontal direction. A stepped reinforcing beam 7a is constructed.

  After the plurality of reinforcing column units 6 and the reinforcing beam units 7 installed on the top, bottom, left and right as described above are joined by the vertical PC steel material 8 and the horizontal PC steel material 10 to form the outer frame 5, the outer frame 5 and the existing building are formed. 1 is joined by a base joint slab 24 for horizontal shear force transmission and a joint slab 11 (shown in FIGS. 5 to 8) to complete seismic reinforcement of the existing building 1.

  The main features of the present invention are as follows: (1) The new foundation 3 of the outer frame 5 can be installed close to the existing building 1 by providing the new foundation 3 between the existing pillars 47 so as not to interfere with the existing foundation 19. It is. (2) The pre-reinforced concrete frame 5 is a unit in which the precast concrete reinforcing pillar 6a and the reinforcing beam 7a are divided into a plurality of parts in the vertical and horizontal directions, and is relatively simple and efficiently assembled by mechanical repetitive work. Composed. (3) The reinforcing column unit 6 and the reinforcing beam unit 7 are made of precast concrete that can be mass-produced at the factory. (4) The reinforcement column unit 6 and the reinforcement beam unit 7 are provided with sufficient rigidity by being integrated by the vertical PC steel material 8 and the horizontal PC steel material 10. (5) Since it is made of precast concrete, it has advantages such as being excellent in harmony with the existing building 1 and being in harmony with the surroundings without any sense of incongruity.

  The structure form of each part is demonstrated in order.

  With reference to FIG. 4 and FIG. 5, the structural form of the reinforcement base part 13 is demonstrated. The existing building 1 is a reinforced concrete apartment house such as a middle-high-rise building, an elementary or junior high school, etc., and a foundation pile 16 such as a reinforced concrete pile is spaced in the left-right direction on the ground 15 so as to be close to the outer wall 14. The new foundation 2 is provided above the foundation pile 16. The new foundation 2 may be a direct foundation by omitting the foundation pile 16, and depending on the ground conditions and whether the existing building 1 is a low-rise / middle-high rise, including whether it is a cloth foundation or an independent foundation. The foundation beam 3 is provided on the new foundation 2, and the lowermost reinforcing column unit 6 is vertically and vertically built on the foundation beam 3.

  More specifically, in FIG. 5, a height adjustment mortar 17 such as a non-shrink mortar is provided on the entire upper surface of the new foundation 2, and a cross section is formed across the upper surface of the height adjustment mortar 17 of the adjacent new foundation 2. An almost vertically long rectangular precast reinforced concrete foundation beam 3 is placed. In the foundation beam 3, the lower part of the vertical PC steel material 8 made of a PC steel bar is disposed in the vertical PC steel material insertion hole 18 formed by the vertical sheath with a space in the left-right direction, and the lower end portion of the vertical PC steel material 8 is made of steel. It is locked by a steel locking bracket 20 made of a female screw member that engages with the support member 19 and is embedded and fixed to the new foundation 2.

  The vertical PC steel 8 is projected upward from the upper surface of the foundation beam 3 by a predetermined distance. The vertical PC steel 8 is for integrating the upper and lower sides of the reinforcing column units 6 loaded in multiple stages. When one vertical PC steel 6 is used, the vertical PC steel 8 is composed of a plurality of reinforcing column units 6. May be provided so as to be able to be inserted over the entire length, or when a plurality of vertical PC steel members 8 are added as shown in FIG. 9, at least the length protruding from the upper end surface of the lower reinforcing column unit 6 Provided.

  In this embodiment, as shown in FIG. 9, a PC steel material is appropriately connected to a male screw portion 21 provided at the upper end portion of the vertical PC steel material 8 by a collar 22 described later, and from the upper end of one reinforcing column unit 6. The dimensions are set appropriately so as to protrude.

  Further, in FIG. 5, a reinforced concrete slab 23 made of reinforced concrete is constructed between the foundation beam 3 and the existing building 1, and a foundation joint slab 24 made of a cast-in-place concrete structure is constructed thereon. The base joint slab 4 is provided, for example, with a joint rebar 26 fixed to an insert fitting 25 installed in the field on the side of a reinforced concrete foundation beam 3 and a side hole formed on the side of the existing building 1. A post-construction anchor (chemical anchor) bar 27 is joined, and a connecting bar 28 is disposed between the two reinforcing bars 26, 27, and then the concrete is constructed on site. The foundation beam 3 and the existing building 1 are coupled via the foundation joint slab 24 so as to be able to transmit a shearing force due to a horizontal force.

  On the upper surface of the foundation beam 3, the lowermost reinforcing column unit 6 is built with a flat surface parallel to the outer surface of the existing building 1 through a height adjusting mortar 29 such as a non-shrink mortar. As shown in FIG. 6, the reinforcing column unit 6 is made of precast reinforced concrete having an oblong cross section and has a head portion 6b, a trunk portion 6c, and a side trip portion 6d on the shoulder portion thereof. (For example, a height dimension corresponding to the height of each floor of the existing building), and a plurality of the reinforcing column units 6 are stacked to form a column of reinforcing columns 6a as a whole.

  The reinforcing column unit 6 is vertically and horizontally penetrated through the insertion hole 30 of the vertical PC steel material and the insertion hole 31 of the horizontal PC steel material by embedding the vertical sheath and the horizontal sheath while shifting the position in the thickness direction inside the cross section of the thickness. I am letting. When the lowermost reinforcing column unit 6 is installed in the foundation beam 3, the vertical PC steel material 8 is inserted through the vertical PC steel material insertion hole 30 so as to protrude from the upper portion of the unit. The vertical PC steel material 8 is protruded from the upper end surface.

  While the reinforcement column units 6 in the lowermost row are erected at a predetermined interval on the foundation beam 3 using a heavy machine such as a crane, the reinforcement beam unit 7 is also installed between adjacent reinforcement column units 6 using a heavy machine such as a crane. It is suspended and installed on the business trip part 6 d of the reinforcing column unit 6. When the reinforcement column unit 6 and the reinforcement beam unit 7 in the lowermost row are finished, the second-stage reinforcement column unit 6 and the reinforcement beam unit 7 are installed. Thereafter, the steps are repeated, and the reinforcing column unit 6 and the reinforcing beam unit 7 are sequentially assembled and integrated with the vertical PC steel material 8 and the horizontal PC steel material 10.

  As shown in FIG. 6, the reinforcing beam unit 7 has substantially the same thickness as the reinforcing column unit 6 and is made of precast reinforced concrete having a substantially vertically long cross section, and a horizontal sheath is embedded by embedding a horizontal sheath inside the cross section of the thickness. It penetrates the insertion hole 31 of the PC steel material.

  The width of the reinforcing beam unit 7 is set to be equal to the interval between the adjacent reinforcing column units 6, and the height (h) is equal to the height (H) of the head 6 b of the reinforcing column unit 6. It is evenly established. Further, the end of the reinforcing beam unit 7 is provided with an engaging portion 7b whose upper side travels, and the curved surface of the lower surface of the engaging portion 7b matches the curved surface of the upper surface of the side traveling portion 6d of the reinforcing column unit 6. It is provided as follows.

  Accordingly, as shown in FIG. 6, the engaging portion 7 b of the reinforcing beam unit 7 is placed on the side travel portion 6 d of the adjacent reinforcing column unit 6 so that the contact member does not have a gap. The reinforcing beam unit 7 can be positioned and supported on the column unit 6. At this time, the horizontal PC steel material insertion holes 31 and 32 passing through the reinforcing beam unit 7 and the reinforcing column unit 6 are matched.

The height (h) of the reinforced beam unit 7 is substantially the same as the height (H) of the head 6b of the reinforced column unit 6, and the reinforced beam unit 7 is reinforced at each stage stacked vertically. Since it is provided corresponding to the column unit 6, a daylighting space is formed between the upper and lower reinforcing beams 7 a composed of the reinforcing beam units 7 extending in the lateral direction. Further, the reinforcing column unit 6 and the reinforcing beam unit 7 are arranged so as to avoid openings such as windows of the existing building 1 and are installed as close as possible to the existing building 1, so that the existing existing space can be more efficiently provided through the daylighting space. Sunlight can be taken into the building 1.
by doing,

  For each step (the height (H) of the head 6b of the reinforcing column unit 6 is one step), the horizontal PC steel material insertion holes 31 and 32 of the reinforcing column unit 6 and the reinforcing beam unit 7 arranged in the horizontal direction are laterally PC. By inserting the steel material 10 and introducing prestress, the reinforcing column unit 6 and the reinforcing beam unit 7 at each stage are integrated.

  The order of construction for assembling the steps of the reinforcing column unit 6 and the reinforcing beam unit 7, and the construction procedure for introducing prestress through the vertical PC steel material 8 and the transverse PC steel material 10 are selected as the optimum construction procedure in the field. You can do it.

  Next, an example in which the upper and lower reinforcing column units 6 are added by a plurality of vertical PC steel members 8 will be described with reference to FIG. The vertical PC steel material 8 is inserted into the vertical PC steel material insertion hole 30 formed by the sheath 38 in the reinforcing column unit 6, and a coupler 22 is interposed in the vertical PC steel material 8 so as to be added above the new PC steel material 8. A height adjusting mortar 29 is appropriately provided on the upper end surface of the column unit 6. The longitudinal PC steel material 8 is tension-fixed by a fixing bracket 34 such as a nut, and the upper end portion of the longitudinal PC steel material 8 inserted into the uppermost reinforcing column unit 6 is longitudinally stretched by a tension device (not shown). As shown in the upper part of FIG. 9, the fixing metal fitting 36 such as a nut engaged with the upper surface in the recess 35 at the upper end of the vertical PC steel 8 in a state where the entire PC steel 6 is tensioned to a predetermined value. The anticorrosion treatment is performed by the anticorrosion material 37 that is fixed by the above and filled in the concave portion 35.

  Further, as shown in FIGS. 10A and 10B, the end portion of the horizontal PC steel material 10 is fixed by a fixing fitting 36 such as a nut in a concave portion 39 on the side surface of the end reinforcing column unit 6 e, and the concave portion 39. It is filled with an anticorrosive material 37 such as mortar and embedded to be subjected to rust prevention treatment.

  A large number of reinforcing column units 6 and reinforcing beam units 7 are assembled in the foundation beam 3 and integrated by introducing prestress between the vertical PC steel material 8 and the horizontal PC steel material 10 to form the reinforcing column 6a and the reinforcing beam 7a. After the outer frame 5 is constructed by these, the outer frame 5 and the existing building 1 are joined to each other at the upper portion of the reinforcing base portion 13 by a joining slab 11 (FIG. 4) constructed from on-site reinforced concrete. Four examples of the joining slab 11 are shown in FIGS.

  In the joint slab 11 of the first example shown in FIG. 7 (a), a joint rebar 26 is fixed to an insert fitting 25 installed on site on the side of the reinforcing beam unit 7, and on the side of the existing building 1 sideways. A post-installed post-installed anchor bar (chemical anchor bar) 27 is joined by drilling a hole, and a connecting slab 28 is arranged between the two reinforcing bars 25, 27, and then concrete is applied on-site to form a joint slab. 11 is built. Therefore, the outer frame 5 and the existing building 1 are connected via the joining slab 11 so as to be able to transmit a shearing force by a horizontal force. The temporary formwork to be assembled when placing concrete is not shown.

  Furthermore, the thickness (T) of the joining slab 11 is smaller than the thickness (t) of the beam 40 of the existing building 1 and is desirably set to ½ or less. As a result, in the event of shaking due to an earthquake, shearing force can be transmitted between the outer frame 5 and the existing building 1, and excessive stress is prevented from acting on the joint portion between the joint slab 11 and the existing building 1 and is damaged. Fear can be eliminated. Making the thickness (T) of the joint slab 11 smaller than the thickness (t) of the beam 40 of the existing building 1 is the same for the joint slab 11 of the second to fourth examples described below.

  In the joint slab 11 of the second example shown in FIG. 7B, an example is shown in which the joint slab is constructed by combining the existing slab 41 protruding from the building frame such as the veranda of the existing building 1 and cast-in-place concrete. . In this second example, a joint rebar 26 is fixed to an insert fitting 25 installed in the field construction on the side of the reinforcing beam unit 7, and a horizontal hole is drilled on the side of the existing building 1 to provide an anchor reinforcement (chemical) Anchor bars) 27 are connected, and the connecting reinforcing bars 28 are arranged between the two reinforcing bars 26, 27, and a cast-in-place concrete slab is constructed under the existing slab 41 from the concrete placing hole 42 opened in the existing slab 41. Thus, the joining slab 11 is constructed. Through this joint slab 11, the outer frame 5 and the existing building 1 are coupled so as to be able to transmit a shearing force by a horizontal force. A temporary formwork to be assembled when placing concrete is not shown.

  In the joint slab 11 of the third example shown in FIG. 8A, the precast plate 43 serving as a part of the joint slab 11 and the formwork is formed on the beam 40 of the existing building 1 from the side surface of the reinforcing beam unit 7. The joint slab 11 is constructed by integrally forming the adjacent lengths and placing a shearing force transmitting slab on the formwork / precast plate 43. A joint rebar 26 is fixed to an insert fitting 25 installed on site on the side of the reinforcing beam unit 7, and a post-installed anchor bar (chemical anchor bar) 27 is joined by drilling a horizontal hole on the existing building 1 side. In the same manner as in the first to third examples, the connecting reinforcing bars 28 are arranged and connected between the reinforcing bars 26 and 27 and these reinforcing bars are embedded in the joint slab 11.

  In the joint slab 11 of the fourth example shown in FIG. 8 (b), a temporary chemical anchor bar 44 for post-construction is formed by drilling a horizontal hole in the side surface of the reinforcing beam unit 7 and the side surface of the beam 40 of the existing building 1. Is attached to the temporary anchor bar 27, and a temporary metal fitting 45 (temporary material) 45 made of an angle material is attached to the temporary anchor bar 27, and a temporary mold 46 made of a precast plate or a steel floor material is supported on the temporary metal fitting 45. At the upper part of the temporary formwork 46, a joint reinforcing bar 26 is fixed to the insert fitting 25 installed in the field construction on the side of the reinforcing beam unit 7, and a post-construction anchor bar 27 is connected to the existing building 1 side. The connecting slabs 28 are placed between the connecting rebars 28 and 27 and bonded to each other, and then the concrete for shearing force transmission is cast on-site to construct the joint slab 11. Moreover, although illustration is abbreviate | omitted, PC steel materials may be arrange | positioned between the outer frame 5 and the existing building 1, and it may construct | assemble by introducing prestress to slab concrete.

  In the first to fourth examples, it is preferable to form walls at both ends of the joining slab 11 so that rainwater flowing on the upper surface of the joining slab 11 does not flow to the existing building 1 side. As shown in the four examples, the outer surface of the joining slur 11 is preferably inclined downward so that rainwater flows into the outer frame 5.

In the present embodiment, when the interval (span) between the existing columns 47 of the existing building 1 is large, a plurality of reinforcing columns 6 a may be constructed between the columns 47.

It is a side view of the existing building which implemented the earthquake-proof reinforcement outer frame method which concerns on this invention. It is a top view same as the above. It is a top view which shows installation of the new foundation of the existing foundation of an existing building, and a seismic reinforcement outer frame. It is a vertical side view in the state where the existing building and the outer frame were integrated. It is an expanded sectional view of the reinforcement foundation part of FIG. FIG. 5 is an enlarged perspective view showing a state in which a precast concrete reinforcing column unit and a reinforcing beam unit of an outer frame are coupled together by introducing a prestress with a vertical PC steel material and a horizontal PC steel material. (A), (b) is sectional drawing which shows the 1st example and 2nd example of the connection part by the joining slab of an existing building and an outer frame. (A), (b) is sectional drawing which shows the 3rd example and the 4th example of the joint part by the joining slab of an existing building and an outer frame. 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. It is a side view of the existing building which implemented the conventional seismic reinforcement outer frame construction method. It is a top view same as the above. It is a top view which shows installation of the existing foundation of the existing building by the conventional construction method, and the new foundation of an anti-seismic reinforcement outer frame.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Existing building 2 New foundation 3 Foundation beam 4 Drum slab 5 Outer frame 6 Reinforcement pillar unit 6a Reinforcement pillar 6b Reinforcement pillar unit head 6c Reinforcement pillar unit trunk 6d Business trip part 6e End reinforcement unit
7 Reinforcement beam unit 7a Reinforcement beam 8 Vertical PC steel 10 Horizontal PC steel
DESCRIPTION OF SYMBOLS 11 Joining slab 13 Reinforcement foundation 14 Outer wall 15 Ground 16 Foundation pile 17 Height adjustment mortar 18 Vertical PC steel material insertion hole 19 Existing foundation 20 Steel fastener 21 Male thread part 22 Collar 24 Foundation part joining slab 25 Insert fitting 26 Joint reinforcement 27 Post-installed anchor bar 28 Connecting rebar 29 Height adjustment mortar 30 Vertical PC steel material insertion hole 31 Horizontal PC steel material insertion hole 32 Horizontal PC steel material insertion hole 34 Fixing bracket 35 Recess 36 Fixing bracket 37 Anticorrosion material 38 Sheath 39 Recess 40 Beam of existing building 41 Existing Slab 42 Concrete Placing Hole 43 Precast Plate 44 Temporary Chemical Anchor Bar 45 Temporary Bracket 46 Temporary Form 47 Existing Column 48 Reinforcement Outer Frame 49 New Foundation 50 Reinforcement Column 51 Reinforcement Beam

Claims (5)

A seismic reinforcement outer frame method for an existing building, where a new foundation for the outer frame is constructed between the columns of the existing building at a position where it does not interfere with the foundation of the existing column, and the foundation beam on the new foundation is made of precast concrete The vertical reinforcing column units are inserted into the upper and lower reinforcement column units, and the reinforcement beam units made of precast concrete are supported at a predetermined height by the adjacent reinforcement column units. Process A for introducing prestress with PC steel and integrating it, and Process B for introducing and integrating prestress with horizontal PC steel that penetrates between the reinforcing column unit and the reinforcing beam unit in the horizontal direction. Are performed in the order of A, B or B, A to form the outer frame, and the outer frame and the existing building are joined with a joining slab to transmit the stress during the earthquake. Construction method of seismic retrofitting outer frame, characterized in that so as to. The construction method of an outer frame for seismic reinforcement according to claim 1, wherein the joining slab is constructed of concrete cast in site construction. The joint slab is constructed by installing post-installed anchors on the beam part of the existing building and placing concrete, or by introducing prestress into the slab concrete with PC steel placed between the outer frame and the existing building The construction method for an outer frame of seismic reinforcement according to claim 1 or 2, characterized in that: The construction method of the seismic reinforced outer frame according to claim 1 or 2, wherein the joining slab is constructed by placing concrete on an upper part of a precast plate also used as a mold integrally provided on the outer frame. 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 anti-seismic reinforcement outer frame of Claim 1.

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