JP2016142021A - Stress conveyance structure between shear wall and lower beam of concrete column-beam frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stress conveyance structure between a shear wall and a lower beam of a concrete column-beam frame, of improved construction efficiency that reduces the number of construction processes for an anchor used in stress conveyance, at the same time appropriately ensuring stress conveyance between the shear wall, including an opening, and the lower beam, without installing a member that becomes an obstacle to the opening on the shear wall.SOLUTION: A stress conveyance structure includes: a belt-like plate member 11 installed between a shear wall and a lower beam 5 without blocking an opening, adhered on the lower beam, and having an anchor bar 10 anchored inside the shear wall; a shearing anchor 12 installed between the shear wall and the lower beam on both right and left sides of the opening, and having a lower edge part side anchored on the lower beam and an upper edge part side anchored on the shear through the belt-like plate member, for conveying shear stress; and a tensile and shearing anchor 13 installed between the shear wall and the lower beam on both right and left sides of the opening, and having a lower edge part side anchored on the lower beam and an upper edge part side connected with an opening reinforcement bar within the shear wall by a lap joint, through the belt-like plate member for conveying shear stress and tensile stress through the opening reinforcement bar.SELECTED DRAWING: Figure 4

Description

  The present invention can appropriately ensure stress transmission between the earthquake-resistant wall and the lower beam including the periphery of the opening without installing an obstacle member in the opening of the earthquake-resistant wall. The present invention relates to a stress transmission structure between a seismic wall and a lower beam in a concrete beam-column frame that can reduce the number of anchors for stress transmission and has high construction efficiency.

  For example, Patent Documents 1 and 2 are known as a structure in which a seismic wall having an opening is constructed in a frame region surrounded by a pair of left and right columns, a lower beam, and an upper beam to reinforce it.

  The “seismic reinforcement structure” of Patent Document 1 is to provide a seismic reinforcement structure that can reduce the generation of vibration and dust by reducing the number of post-installed anchors, and can exert a large proof stress on the earthquake resistant wall having a passage opening. A seismic reinforcement structure that improves the seismic performance of existing structures by installing a seismic wall in the frame surrounded by pillars and beams. And a joining member that is disposed along the lower side of the passage opening and that has at least one end projecting laterally of the passage opening and embedded in the wall body, A shear key that is fixed to the wall body is provided at an end portion of the joint member that is bonded to the upper surface of the lower beam and projects. An opening reinforcing bar and a wall bar are arranged in the wall body.

  Stress transmission between the wall and the beam is performed by a joining member bonded to the beam, a post-installed anchor that fixes the joining member to the beam, and a shear key that fixes the joining member to the wall. The joining member is installed in the lower part of the passage opening in order to ensure the strength around the passage opening.

  The “seismic frame structure and its construction method” of Patent Document 2 is an earthquake frame structure in which an earthquake resistant panel is arranged in a frame formed by being surrounded by a pair of left and right columns and a pair of upper and lower beams. Partitioned by the seismic panel to form an opening from the upper end of the lower beam to the lower end of the upper beam, and joined to the lower beam and the upper beam at the upper and lower edges of the opening, respectively. The connecting plate is configured to transmit the horizontal force in the frame between the left and right edges of the opening. A brace element and a welded wire mesh are embedded in the earthquake-resistant panel, and a vertical plate at the opening is provided by a stud bolt facing the opening.

  In order to ensure the strength around the opening, a connecting plate that transmits a horizontal force in the left-right direction of the opening is provided by the adhesive layer and the post-installed anchor bolt.

JP 2006-63732 A Japanese Patent No. 5079640

  In any of the patent documents, in order to ensure the strength of the passage opening and the periphery of the opening, a joining member and a connecting plate are installed below them. For this reason, a level | step difference arises in passage opening etc., and it became the obstruction of traffic using these passage openings etc.

  If the joining member or the like is removed from the passage openings, the structural strength around the passage openings or the like cannot be obtained sufficiently. Specifically, when a horizontal external force such as an earthquake acts on the frame, compressive stress or tensile stress is generated in an oblique direction on the earthquake-resistant wall or earthquake-resistant panel in the frame.

  The tensile stress acts to pull up the lower end portion of the passage opening and the like joined to the lower beam (lower beam), so if a joining member or the like that reinforces this is installed in the passage opening or the like, Due to the tensile stress, the periphery of the lower end of the passage opening and the like is lifted from the lower beam, and the fracture occurs, so that the effect of resisting resistance by transmitting stress between the earthquake resistant wall and the lower beam is lost. There is a risk of being broken.

  Further, when a horizontal external force such as an earthquake acts on the frame, a shear stress acts between the seismic wall and the lower beam. If a joining member or the like that reinforces the passage opening or the like is not installed, the shear stress may cause breakage around the lower end portion of the passage opening or the like.

  When installing a seismic wall, etc. with high strength around the passage opening, etc. without installing any connecting members that will obstruct the passage, etc., at the lower part of the passage opening, etc. It is conceivable to construct a large number of anchors for this purpose. However, constructing a large number of anchors has a problem in that work efficiency is poor.

  In addition, when installing seismic walls, etc. in an existing building, it is possible to perform construction while staying, that is, construction that can be used outside the scope of construction, specifically, in the case of a condominium, the room where the construction is performed is divided. In an office building or store, just divide the area where the work is being done and the other areas can be used. Many anchor holes must be drilled.

  In the construction of the anchor hole, large vibrations and noises are generated, and a large amount of dust is generated. Therefore, it is not preferable to construct a large number of anchors when constructing while staying.

  The present invention was devised in view of the above-described conventional problems, and stress between the earthquake-resistant wall and the lower beam including the periphery of the opening is provided without installing a member that becomes an obstacle in the opening of the earthquake-resistant wall. It is possible to ensure transmission appropriately, reduce the number of anchors for the stress transmission, and reduce the stress between the seismic wall and the lower beam in a concrete column beam structure with high construction efficiency. An object is to provide a transmission structure.

  The stress transmission structure between the seismic wall and the lower beam in the concrete column beam frame according to the present invention is provided in a region in the frame frame surrounded by a pair of left and right columns, the lower beam, and the upper beam, and immediately above the upper surface of the beam of the lower beam. An RC reinforcing wall having an opening formed in the opening and having an opening reinforcing bar for reinforcing the opening in the vicinity of the opening and having a wall reinforcing bar arranged therein is connected to the lower beam. A stress transmission structure between a seismic wall and a lower beam in a concrete column beam structure that is connected so as to be able to transmit stress to the seismic wall, and is disposed avoiding the opening between the seismic wall and the lower beam. The lower surface is bonded to the upper surface of the beam, and the fixing bar provided on the upper surface is provided between the earthquake-resistant wall and the lower beam so as to be positioned on both the left and right sides of the opening. And the lower end in the vertical direction through the belt-like plate material. The side is fixed inside the lower beam and the upper end side is fixed inside the earthquake-resistant wall, and shear anchors that transmit the shear stress generated in the earthquake-resistant wall to the lower beam are positioned on both the left and right sides of the opening. Located between the earthquake-resistant wall and the lower beam, the lower end in the vertical length direction is fixed to the inside of the lower beam and the upper end side is located inside the earthquake-resistant wall via the strip-shaped plate member. A tensile joint that is joined by a lap joint and transmits the tensile stress generated in the lower part of the earthquake-resistant wall to the lower beam through the opening reinforcing bar, and transmits the shear stress generated in the earthquake-resistant wall to the lower beam. It is provided with a shear combined anchor.

  In the strip-shaped plate material, in order to allow the shearing anchor and the tensile / shearing anchor to penetrate loosely, through holes having a diameter larger than the outer diameter of these anchors are formed.

  When the outer diameter dimensions of the shear anchor and the tension / shear anchor are the same, the anchoring length of the tension / shear anchor with respect to the earthquake-resistant wall and the lower beam is larger than the anchor length of the shear anchor. Characterized by its long length.

  The fixing length of the shear anchor in the earthquake-resistant wall is substantially the same as the fixing length of the fixing muscle.

  When an existing wall having an existing opening is provided in the frame area, the earthquake-resistant wall is constructed by overlapping the existing wall from the front-rear direction so that the opening overlaps the existing opening. Features.

  In the stress transmission structure between the seismic wall and the lower beam in the concrete column beam structure according to the present invention, the seismic wall and the lower part including the periphery of the opening are installed without installing an obstacle member in the opening of the seismic wall. It is possible to appropriately ensure the transmission of stress between the beams, reduce the number of anchor constructions for the stress transmission, and improve the construction efficiency.

It is a front view of a column beam frame showing a preferred embodiment of a stress transmission structure between a seismic wall and a lower beam in a concrete column beam frame according to the present invention. FIG. 2 is an enlarged partial sectional view of a part A in FIG. 1. It is a top view of the strip | belt-shaped board | plate material applied to the stress transmission structure shown in FIG. It is a principal part expanded sectional view which shows the installation state of the fixing reinforcement applied to the stress transmission structure shown in FIG. It is a principal part expanded sectional view which shows a mode that the strip | belt-shaped board | plate material shown in FIG. 3 is installed in a downward beam. 1. It is a modification of embodiment shown in FIG. 1, Comprising: It is a BB arrow directional cross-sectional view in FIG. 1 when the existing wall which has the existing opening is provided in the area | region in the frame of the existing building. It is a front view of a column beam frame in the case where an opening is formed at one of the left and right columns.

  Hereinafter, preferred embodiments of a stress transmission structure between a seismic wall and a lower beam in a concrete column beam frame according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a front view of a column beam structure showing a stress transmission structure between a seismic wall and a lower beam in a concrete column beam structure according to the present embodiment, and FIG. 2 is an enlarged partial sectional view of part A in FIG. 3 is a plan view of a strip-like plate material applied to the stress transmission structure shown in FIG. 1, and FIG. 4 is a fixing bar, a shear anchor, and a tensile / shear combination applied to the stress transmission structure shown in FIG. The principal part expanded sectional view which shows the installation state of an anchor, FIG. 5: is a principal part expanded sectional view which shows a mode that the strip | belt-shaped board | plate material shown in FIG. 3 is installed in a downward beam.

  This embodiment demonstrates the case where RC seismic wall 3 with the opening 2 is newly added with respect to the concrete column beam frame 1 of the existing building in which the wall is not installed. The concrete column beam frame 1 is a column beam frame constructed by an RC structure or an SRC structure.

  As shown in FIG. 1, a column beam frame 1 of an existing building is composed of a pair of left and right columns 4, a lower beam 5 and an upper beam 6, and is surrounded by these columns 4 and beams 5 and 6 as is well known. A frame internal region X is formed in the inside. In the present embodiment, an RC earthquake-resistant wall 3 having an opening 2 is provided in a frame-internal region X having no wall.

  The RC seismic wall 3 itself having the opening 2 is also well known in the art. A wall reinforcing bar 7 is arranged in the frame region X, and an opening reinforcing bar 8 that reinforces the opening 2 around the opening 2 is provided. By placing wall concrete 9 inside the assembled formwork or spraying wall mortar, the reinforced concrete structure with the wall reinforcement 7 and the opening reinforcement 8 embedded inside It is constructed in the inner region X.

  The opening 2 of the earthquake-resistant wall 3 is used for traffic and the like, and is formed immediately above the beam upper surface 5a of the lower beam 5, specifically, the lower edge of the opening 2 is defined by the beam upper surface 5a of the lower beam 5. Is done. In the present embodiment, the opening 2 is also positioned approximately in the center of the earthquake-resistant wall 3 such that the left and right wall portions exist between the left and right columns 4 at a distance from both the left and right columns 4. The Further, the opening 2 is positioned such that an upper wall portion exists between the opening 2 and the upper beam 6 at a distance downward from the upper beam 6.

  The present embodiment relates to a stress transmission structure between the earthquake-resistant wall 3 and the columns 4 and the beams 5 and 6, and particularly relates to a stress transmission structure that connects the earthquake-resistant wall 3 to the lower beam 5 so as to be able to transmit stress.

  As shown in FIGS. 1 to 4, the stress transmission structure between the seismic wall 3 and the lower beam 5 is mainly generated in the steel strip plate 11 having the steel anchor bars 10 and the seismic wall 3. A steel shear anchor 12 that transmits shear stress to the lower beam 5 and a steel tension / shear anchor 13 that transmits tensile stress and shear stress generated in the earthquake-resistant wall 3 to the lower beam 5 are configured. .

  The tensile / shear combined anchor 13 is a post-installed anchor, and is used to transmit tensile stress from the earthquake-resistant wall 3 to the lower beam 5 as will be described later. When tensile stress is not borne, the shear stress is transmitted from the earthquake-resistant wall 3. It is transmitted to the lower beam 5, and in this sense, it is also used for tensile stress and shear stress.

  The strip-shaped plate material 11 is provided on the pair of left and right columns 4 and the upper beam 6 and the lower beam 5 so as to face the frame region X. Specifically, the strip-shaped plate member 11 is substantially continuous over the entire length around the seismic wall 3 with respect to the column beam frame 1 except for the position of the opening 2 in order to join the seismic wall 3 to the column beam frame 1. Provided. In the belt-like plate material 11, a plurality of fixing bars 10 are erected in a protruding state, arranged on the fixing surface 11 a of one side of the pair of front and back plate surfaces at intervals along the length direction. At the tip of the fixing muscle 10, a fixing head 10a is formed which is embedded in the wall concrete 9 or the like and fixed to the earthquake-resistant wall 3. The fixing muscle 10 exhibits a shear stress transmission action.

  In the belt-like plate member 11 provided in the lower beam 5, in addition to the fixing bar 10, a plurality of through holes 11 b for penetrating the shearing anchor 12 and the tensile / shearing anchor 13 are arranged in the arrangement direction of the fixing bar 10. It is formed.

  These through-holes 11b are formed with a hole diameter larger than the outer diameter of the anchors 12 and 13 so that the shear anchor 12 and the tensile / shear anchor 13 are penetrated loosely. Therefore, the belt-like plate member 11 and the shearing anchor 12 and the tensile / shearing anchor 13 penetrating through the through-hole 11b are not in contact with each other and are not directly joined to each other by welding joining or the like.

  The strip-shaped plate member 11 with the through hole 11 b is provided to the lower beam 5 while avoiding the opening 2. That is, in the drawing, two sheets of a belt-like plate material 11 having a length dimension from the lower left corner of the opening 2 to the left column 4 and a belt-like plate member 11 having a length dimension from the lower right corner of the opening 2 to the right column 4 are: The lower beam 5 is provided on the beam upper surface 5 a of the lower beam 5 so as to approach the left and right columns 4 on both sides of the opening 2 in the left-right length direction.

  A strip-shaped plate member 11 without a through hole is provided along the left-right length direction with respect to the upper beam 6. In the present embodiment, the strip-shaped plate member 11 provided on the upper beam 6 is composed of one sheet having the left-right width dimension of the opening 2 and two sheets having the same size as the strip-shaped plate member 11 disposed on the lower beam 5. 6 are attached to the lower surface 6a of the beam 6 side by side so as to be continuously arranged in the left-right direction.

  The strip-shaped plate material 11 provided in each column 4 is also provided with no through hole and along the vertical height direction of the column 4. The strip-shaped plate material 11 provided in each column 4 is two pieces of upper and lower ones having a length dimension that is half the column height, and is arranged and attached to the column surface 4a so as to be continuous in series. All of these strip-shaped plate members 11 are laid on the columns 4 and the beams 5 and 6 before the earthquake resistant wall 3 is constructed.

  The strip-shaped plate member 11 provided on the lower beam 5 is installed by being bonded to the beam upper surface 5a of the lower beam 5 with an adhesive 14 such as epoxy resin, with the lower surface facing the lower beam 5 being an adhesive surface 11c. The provided fixing muscle 10 protrudes into the frame region X. When the earthquake-resistant wall 3 is constructed, the strip-shaped plate member 11 is installed between the earthquake-resistant wall 3 and the lower beam 5 so as to avoid the opening 2, and the fixing bar 10 has a protruding length from the fixing surface 11 a of the strip-shaped plate member 11. Is set as the fixing length, embedded in the earthquake-resistant wall 3 and fixed.

  The strip-like plate material 11 provided on the upper beam 6 and the column 4 is also installed by bonding the adhesive surface 11c facing the beam lower surface 6a of the upper beam 6 and the column surface 4a of the column 4 with the adhesive 14, and the adhesive surface 11c. Fixing muscles 10 arranged on the fixing surface 11a on the opposite side of the protrusion protrude into the frame region X. When the earthquake-resistant wall 3 is constructed, the fixing muscle 10 is embedded and fixed inside the earthquake-resistant wall 3 with the protruding length from the fixing surface 11a of the strip-shaped plate member 11 being the fixing length.

  Since the belt-like plate material 11 is installed so as to avoid the opening 2, it is positioned in the vicinity of the opening 2 on both the left and right sides of the opening 2 in order to ensure the transmission of shear stress from the earthquake resistant wall 3 to the lower beam 5 in the vicinity of the opening 2. Thus, a shearing anchor 12 is provided. The lower end of the shear anchor 12 in the vertical length direction is fixed inside the lower beam 3, and the upper end is embedded in the wall concrete 9 in the frame region X and fixed inside the earthquake resistant wall 3. A fixing head 12 a is formed at the upper end of the shearing anchor 12 in the same manner as the fixing muscle 10.

  The lower beam 5 is drilled inward from the upper surface 5a of the beam, and the shear anchor hole for fixing the shear anchor 12 to the lower beam 5 with the fixing length P necessary for transmitting the shear stress. 15 is formed. The shear anchor hole 15 is filled with a filler 16 made of a resin adhesive for fixing the shear anchor 12 inserted therein to the lower beam 5.

  The shear anchor 12 fixed in the shear anchor hole 15 is moved from the fixing surface (upper surface) 11a of the belt-like plate material 11 to the frame internal region X, in other words, toward the inside of the earthquake-resistant wall 3 where the anchor is fixed. It is projected with a fixing length Q required for transmission of. The shear anchor hole 15 is formed at a position that coincides with any of the through holes 11b of the strip plate 11 when the strip plate 11 is installed in the lower beam 5, and thereby the shear anchor hole 15 and the through hole 11b Are communicated in the vertical direction so that a shear anchor 12 can be installed on the lower beam 5.

  As described above, the shear anchor 12 is provided between the earthquake-resistant wall 3 and the lower beam 5 through the through-hole 11b of the belt-like plate member 11, and the upper end side and the lower end side thereof are fixed to each other. Is transmitted to the lower beam 5.

  In this embodiment, the anchoring length Q of the shear anchor 12 inside the earthquake-resistant wall 3 is substantially the same as the anchoring length Q of the anchoring muscle 10 inside the earthquake-resistant wall 3. In the illustrated example, sets of shear anchors 12 and shear anchor holes 15 are provided one by one on the left and right sides of the opening 2, closer to the column 4 side than the opening reinforcing bars 8 that reinforce the opening 2.

  Further, since the belt-like plate member 11 is installed so as to avoid the opening 2, it is positioned at the time of opening on both the left and right sides of the opening 2 in order to ensure transmission of tensile stress from the earthquake-resistant wall 3 to the lower beam 5 in the vicinity of the opening 2. Thus, the tension / shear combined anchor 13 is provided. When a horizontal external force such as an earthquake acts, a compressive stress is generated in an oblique direction from the upper left corner to the lower right corner, for example, at each of the left and right wall portions existing across the opening 2, and at the same time, the upper right intersects with the compressive stress. A tensile stress is generated in an oblique direction from the corner toward the lower left corner.

  The compressive stress acts to press the earthquake resistant wall 3 against the lower beam 5 and can be borne by the wall concrete 9 of the earthquake resistant wall 3. On the other hand, since the tensile stress acts to lift the earthquake-resistant wall 3 from the lower beam 5, it cannot be borne by the wall concrete 9 and needs to be transmitted to the lower beam 5 by a reinforcing bar or the like.

  In order to transmit the tensile stress generated in the earthquake-resistant wall 3 to the lower beam 5, a tensile / shear anchor 13 is provided. If tensile stress is generated at the opening 2, whether it is the left wall portion or the right wall portion on both sides of the opening 2, this tensile stress is transmitted to the lower beam 5 by the tensile / shear anchor 13. When tensile stress is generated at the column 4, the tensile stress is directly transmitted to the column 4 and a part is transmitted to the lower beam 5 by the strip plate 11.

  On the other hand, when compressive stress is generated at the opening 2, the wall concrete 9 bears this, and the tension / shear anchor 13 does not need to transmit the tensile stress, so the anchor 13 is the shear anchor 12. At the same time, the shear stress generated in the earthquake-resistant wall 3 is transmitted to the lower beam 5.

  The tension / shear anchor 13 is fixed to the inside of the lower beam 5 at the lower end in the vertical direction, and the upper end is joined to the opening reinforcing bar 8 arranged around the opening 2 by a lap joint. Then, it is buried in the wall concrete 9 or the like in the frame region X and fixed inside the earthquake-resistant wall 3. Thereby, the tension / shear combined anchor 13 fixes the opening reinforcing bar 8 to the lower beam 5. A fixing head 13 a is also formed on the upper end of the tension / shear anchor 13 in the same manner as the fixing muscle 10 and the shear anchor 12.

  The lower beam 5 is drilled inwardly from the beam upper surface 5a, and the tensile / shear anchor 13 is fixed to the lower beam 5 with a fixing length R necessary for transmitting tensile stress and shear stress. A tension anchor hole 17 is formed for this purpose. The tensile anchor hole 17 is filled with a filler 16 for fixing the tensile / shear anchor 13 inserted therein to the lower beam 5.

  The tension / shear combined anchor 13 fixed in the tensile anchor hole 17 moves from the fixing surface (upper surface) 11a of the strip-shaped plate member 11 to the in-frame region X, in other words, toward the inside of the earthquake-resistant wall 3 to which it is fixed, It protrudes with the fixing length S required for the lap joint with the opening reinforcing bar 8. The fixing length S required for the lap joint satisfies the fixing length for transmitting tensile stress and shearing force from the earthquake-resistant wall 3 to the lower beam 5.

  The tension anchor hole 17 is formed at a position that coincides with any one of the through holes 11b of the belt-like plate member 11 when the belt-like plate member 11 is installed on the lower beam 5, and thereby, the tension anchor hole 17 and the through-hole 11b Are communicated in the vertical direction so that a tensile / shearing anchor 13 can be installed on the lower beam 5.

  As described above, the tensile / shear combined anchor 13 is provided between the earthquake-resistant wall 3 and the lower beam 5 through the through-hole 11b of the belt-like plate member 11, and the upper end side and the lower end side thereof are fixed to each of them. The tensile stress generated in the wall 3 is transmitted to the lower beam 5 through the opening reinforcing bar 8, and the shear stress generated in the earthquake-resistant wall 3 is transmitted to the lower beam 5.

  In this embodiment, the case where the outer diameter dimension of the shear anchor 12 and the tension / shear anchor 13 is the same is shown, and the seismic resistance of the tension / shear anchor 13 that needs to transmit the tensile stress is shown. The anchoring lengths R and S for the wall 3 and the lower beam 5 are longer in both the earthquake-resistant wall 3 and the lower beam 5 than the anchoring lengths P and Q of the shear anchor 12 that only needs to transmit shear stress.

  The outer diameter dimension of the shear anchor 12 and the tensile / shear joint anchor 13 and the fixing length to the earthquake-resistant wall 3 and the lower beam 5 may be set in any way as long as necessary shear stress and transmission of the tensile stress can be secured. .

  Further, the shear stress is transmitted by the shear anchor 12, and the tensile / shear anchor 13 is caused to transmit the tensile stress in the wall portion on the tension side and contribute to the transmission of the shear stress in the wall portion on the compression side. The number of dedicated shear anchors 12 may be reduced by the amount used as the shear anchor.

  In the illustrated example, the set of the tension / shear combined anchor 13 and the tension anchor hole 17 is moved to the vicinity of the opening 2 on both the left and right sides of the opening 2 so as to form a lap joint with the opening reinforcing bar 8 and three each. Is provided.

  Specifically, between the earthquake-resistant wall 3 and the lower beam 5, the tension / shear combined anchor 13, the anchoring muscle 10, and the two tension / shear combined anchors 13 are sequentially formed from the opening 2 toward each column 4. The anchoring muscles 10 and one shearing anchor 12 are disposed, and a plurality of anchoring muscles 10 are embedded from the shearing anchor 12 to the column 4 at intervals.

  Further, in the present embodiment, spiral bars 18 for suppressing the splitting of the wall concrete 9 and the like are embedded in the interior of the earthquake resistant wall 3 in the vicinity of the beam surfaces 5a and 6a and the column surface 4a along the installation position of the strip-shaped plate material 11. It has been.

  Next, the effect | action of the stress transmission structure of the earthquake-resistant wall 3 and the downward beam 5 in the concrete column beam frame 1 which concerns on this embodiment is demonstrated. The construction will be described. First, the shear anchor hole 15 and the tensile anchor hole 17 are formed in the lower beam 5 of the existing building by a drill or the like.

  When these anchor holes 15 and 17 are formed, the belt-like plate material 11 in which the through holes 11b are formed is temporarily placed on the beam upper surface 5a of the lower beam 5, and the formation positions of the anchor holes 15 and 17 are marked. Then, the anchor holes 15 and 17 can be drilled with high accuracy and efficiency.

  Further, if the outer diameter dimension of the shear anchor 12 and the tensile / shear anchor 13 is the same, the anchor holes 15 and 17 can be drilled with the same drill and can be efficiently constructed. In this embodiment, the construction of the anchor holes 15 and 17 for the left and right columns 4 and the upper beam 6 is not performed.

  Next, as shown in FIG. 5, the length dimension (protruding length in the figure) projecting from the beam upper surface 5a of the lower beam 5 toward the upper side of the belt-like plate member 11 in each of the shear anchor hole 15 and the tensile anchor hole 17 is provided. A dummy rebar 19 having a T) is inserted. Next, the adhesive 14 is applied to the beam upper surface 5a of the lower beam 5 and / or the adhesive surface 11c of the belt-like plate member 11, so that the belt-like plate member 11 with the fixing muscle 10 protrudes into the frame region X. Then, it adheres to the lower beam 5.

  At this time, since the dummy rebar 19 is inserted into the anchor holes 15 and 17, the adhesive 14 can be prevented from flowing into the anchor holes 15 and 17, and the inside of the anchor holes 15 and 17 can be kept clean. Can do. Further, by fitting the through-hole 11 b to the dummy rebar 19, the belt-like plate material 11 can be smoothly installed on the beam upper surface 5 a of the lower beam 5 with good positional accuracy by being guided by the dummy rebar 19.

  If the protruding amount of the dummy reinforcing bar 19 inserted into each of the shearing anchor hole 15 and the tensile anchor hole 17 from the strip plate 11 is made the same, the through hole 11b of the strip plate 11 is smoothly fitted to the dummy reinforcing bar 19. It can install, and the installation workability of the strip | belt-shaped board | plate material 11 can be improved. Further, since the dummy rebar 19 protrudes from the strip-shaped plate material 11 into the frame internal region X, it can be easily removed from the anchor holes 15 and 17 with its upper end.

  Next, as shown in FIG. 4, in the lower beam 5, each of the shear anchor hole 15 and the tensile anchor hole 17 from which the dummy reinforcing bar 19 has been removed is filled with the filler 16, and through the through hole 11 b of the strip-shaped plate material 11. Then, the shear anchor 12 and the tensile / shear anchor 13 are inserted into the respective anchor holes 15 and 17 and fixed.

  Thereafter, as shown in FIG. 1 and the like, a formwork is assembled in the frame region X, and the wall reinforcing bar 7, the opening reinforcing bar 8 and the spiral bar 18 are arranged, and the wall concrete 9 is placed or the wall mortar is placed. The RC seismic wall 3 with the opening 2 in which the wall reinforcing bar 7, the opening reinforcing bar 8 and the like are embedded is constructed.

  Inside the seismic wall 3, the fixing bar 10 of the strip-shaped plate material 11 bonded to the column 4 and the beams 5 and 6 is fixed, and the shearing anchor 12 and the tensile / shearing anchor 13 fixed to the lower beam 5 are fixed. Is fixed, the shear anchor 12 transmits the shear stress generated in the earthquake-resistant wall 3 to the lower beam 5 to enhance the shear strength around the opening 2, and the tension / shear anchor 13 is arranged in the vicinity of the opening 2. The opening reinforcing bar 8 is overlapped with the opening reinforcing bar 8 so that the opening reinforcing bar 8 is fixed to the lower beam 5, and the tensile stress generated around the opening 2 of the earthquake-resistant wall 3 is transmitted to the lower beam 5 to pull the tension around the opening 2. While strengthening, it acts as a shear anchor when subjected to compressive stress.

  In the stress transmission structure of the seismic wall 3 and the lower beam 5 in the concrete column beam structure 1 according to the present embodiment described above, the bonding surface 11c is bonded to the beam upper surface 5a of the lower beam 5, and the fixing surface 11a. A belt-like plate member 11 on which the fixing bar 10 provided in the seismic wall 3 is fixed is disposed between the earthquake-resistant wall 3 and the lower beam 5 so as to avoid the opening 2, and the lower end in the vertical length direction is the lower beam 5. The shear anchor 12 that is fixed inside and the upper end side is fixed inside the earthquake-resistant wall 3 and transmits the shear stress generated in the earthquake-resistant wall 3 to the lower beam 5 is connected to the left and right sides of the opening 2 via the belt-like plate material 11. Located on both sides and provided between the seismic wall 3 and the lower beam 5, the lower end in the vertical length direction is fixed inside the lower beam 5, and the upper end is inside the seismic wall 3 and the lap joint Are joined at the bottom of the opening 2 of the seismic wall 3. The tensile / shear anchor 13 for transmitting the tensile stress to the lower beam 5 through the opening reinforcing bar 8 and transmitting the shearing stress generated in the earthquake-resistant wall 3 to the lower beam 5 is opened through the strip plate 11. Are arranged between the seismic wall 3 and the lower beam 5 so that the anchors 12, 13 are installed on the seismic wall 3 with the opening 2 without installing reinforcing members in the opening 2. Thus, it is possible to appropriately ensure stress transmission between the earthquake-resistant wall 3 and the lower beam 5 including the periphery of the opening 2.

  Therefore, there is no obstacle in the opening 2, and smoothness such as traffic can be improved. By adopting the dual tension / shear anchor 13 that can transmit not only the tensile stress but also the shear stress, the number of shear anchors 12 can be reduced, that is, the stresses of the anchors 12 and 13 for transmitting stress can be reduced. The number of constructions can be reduced and construction efficiency can be improved.

  In particular, the number of anchors 12 and 13 that generate large vibrations and noises and a large amount of dust is small. It can be made earthquake resistant.

  In the belt-like plate material 11, in order to allow the shear anchor 12 and the tensile / shearing anchor 13 to penetrate loosely, a through-hole 11 b having a larger diameter than the outer diameter of the anchors 12, 13 is formed. Since joining with these anchors 12 and 13 is not performed, workability can be improved. Moreover, since the strip-shaped plate material 11 and the anchors 12 and 13 are not joined by welding or the like, it is possible to prevent thermal adverse effects on the strip-shaped plate material 11 and the adhesive 14.

  When the outer diameter dimensions of the shear anchor 12 and the tension / shear anchor 13 are the same, the anchoring lengths R and S of the tension / shear anchor 13 with respect to the earthquake resistant wall 3 and the lower beam 5 are the anchor anchors of the shear anchor 12. Since it is longer than the lengths P and Q, the tensile stress can be transmitted appropriately.

  Since the anchoring length Q of the shear anchor 12 inside the earthquake-resistant wall 3 is substantially the same as the anchoring length of the anchoring muscle 10, the shear performance in the general part of the earthquake-resistant wall 3 excluding the vicinity of the opening 2 is homogenized. Can do.

  FIG. 6 shows a modification of the above embodiment. This modification is a case where an existing wall 20 having an existing opening is provided in a frame area X of an existing building, and FIG. 6 is a cross-sectional view taken along line BB in FIG. is there. The earthquake-resistant wall 3 described above is constructed by overlapping the existing wall 20 from the front-rear direction so that the opening 2 overlaps the existing opening (not shown). The existing wall 20 and the newly installed earthquake-resistant wall 3 may be joined together by burying a connecting material in the front-rear direction which is the overlapping direction.

  Although FIG. 7 does not show the embodiment of the present invention, it is a front view of the column beam frame 1 when the opening 2 is formed in any one of the left and right columns 4. is there.

  Even in the illustrated stress transmission structure between the seismic wall 3 and the lower beam 5 in the concrete column beam frame 1, it is arranged so as to avoid the opening 2 between the seismic wall 3 and the lower beam 5. The lower surface is bonded to the upper surface 5a, and the fixing bar 10 provided on the upper surface is fixed to the inside of the earthquake-resistant wall 3, and between the earthquake-resistant wall 3 and the lower beam 5 positioned on one side of the opening 2 The lower end of the vertical length direction is fixed inside the lower beam 5 and the upper end is fixed inside the earthquake-resistant wall 3 via the belt-like plate material 11, and the shear stress generated in the earthquake-resistant wall 3 is transferred to the lower beam. 5, a shear anchor 12 that is transmitted to 5, a side of the opening 2 provided with the shear anchor 12, and disposed between the earthquake-resistant wall 3 and the lower beam 5, The lower end side in the vertical length direction is fixed inside the lower beam 5 and the upper end side. It is joined to the opening reinforcing bar 8 inside the earthquake-resistant wall 3 by a lap joint, and the tensile stress generated in the lower part of the opening 2 of the earthquake-resistant wall 3 is transmitted to the lower beam 5 through the opening reinforcing bar 8 and also generated in the earthquake-resistant wall 3 A tension / shear combined anchor 13 for transmitting shear stress to the lower beam 5 is provided.

  Since the opening 2 is not reinforced with the reinforcing member, the shear wall 12 and the tensile / shear anchor 13 necessary for transmitting the tensile stress and the shear stress are installed, so that the opening 2 having no obstacle is provided in the earthquake resistant wall 3. Can do.

DESCRIPTION OF SYMBOLS 1 Concrete column-beam frame 2 Opening 3 RC earthquake-resistant wall 4 Column 5 Lower beam 5a Beam upper surface of lower beam 6 Upper beam 7 Reinforcing bar 8 Opening reinforcement 10 Anchoring bar 11 Strip plate 11b Through-hole 12 Shear anchor 13 Tensile・ Shear anchor 20 Existing wall P, Q Shear anchor anchor length R, S Tensile / shear anchor anchor length X Frame area

Claims (5)

An opening provided in the frame area surrounded by the pair of left and right columns, the lower beam and the upper beam, having an opening formed immediately above the upper surface of the beam of the lower beam, and reinforcing the opening in the vicinity of the opening Stress transmission between a seismic wall and a lower beam in a concrete column-beam frame that connects an RC seismic wall with a reinforcing bar inside and a wall reinforcing bar inside so that stress can be transmitted to the lower beam Structure,
A belt-like plate material that is disposed between the earthquake-resistant wall and the lower beam so as to avoid the opening, the lower surface is bonded to the upper surface of the lower beam, and the fixing bars provided on the upper surface are fixed inside the earthquake-resistant wall. When,
Located on the left and right sides of the opening, provided between the earthquake-resistant wall and the lower beam, the lower end in the vertical length direction is fixed inside the lower beam and the upper end side is A shear anchor fixed inside the earthquake-resistant wall and transmitting shear stress generated in the earthquake-resistant wall to the lower beam;
Positioned on the left and right sides of the opening between the earthquake-resistant wall and the lower beam, the lower end in the vertical length direction is fixed inside the lower beam and the upper end side is fixed through the strip-shaped plate material. Shear stress generated in the seismic wall, which is joined to the opening reinforcing bar by a lap joint, transmits the tensile stress generated in the lower part of the seismic wall to the lower beam through the opening reinforcing bar, and generates shearing stress in the seismic wall A stress transmission structure between a seismic wall and a lower beam in a concrete column beam frame, comprising a tensile / shear combined anchor for transmitting the beam to the lower beam.   2. A through hole having a diameter larger than the outer diameter of the anchor is formed in the strip-shaped plate material so that the shear anchor and the tensile / shear combined anchor are penetrated loosely. The stress transmission structure between the seismic wall and the lower beam in the concrete column beam structure described in 1.   When the outer diameter dimensions of the shear anchor and the tension / shear anchor are the same, the anchoring length of the tension / shear anchor with respect to the earthquake-resistant wall and the lower beam is larger than the anchor length of the shear anchor. The stress transmission structure between a seismic wall and a lower beam in a concrete column beam frame according to claim 1 or 2, wherein the structure is long.   The concrete anchorage structure according to any one of claims 1 to 3, wherein the anchoring length of the shearing anchor inside the earthquake-resistant wall is substantially the same as the anchoring length of the anchoring bar. Stress transmission structure between the shear wall and the lower beam.   When an existing wall having an existing opening is provided in the frame area, the earthquake-resistant wall is constructed by overlapping the existing wall from the front-rear direction so that the opening overlaps the existing opening. The stress transmission structure between the earthquake-resistant wall and the lower beam in the concrete column beam frame according to any one of claims 1 to 4.

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