JP6247117B2 - Temporary structure during seismic isolation of existing building - Google Patents

Description

  The present invention can reduce the construction of post-installed anchors for joining temporary structures to existing beams by rationally distributing the vertical pull-out force generated through braces for bearing horizontal external forces. This is related to the temporary structure during the seismic isolation of existing buildings.

  For example, patent literature describes a method for making an existing building seismically isolated by installing a seismic isolation device in the excision space formed by excising the middle part of an existing column of a column beam frame provided in an existing building. 1 is known.

  Patent Document 1 “Seismic Isolation Method for Existing Buildings” is a method in which a column load is transferred from a target column to a temporary support material, a seismic isolation device is installed on the cut target column, and then the seismic isolation device is installed from the temporary support material. This is a seismic isolation method for existing buildings, in which the work of removing the temporary support material by replacing the column load on the existing building is completed in sequence for one or all of the target columns. After replacing the column burden load from the material to the seismic isolation device, the work of attaching the horizontal displacement restraint means for the column to restrict the functioning of the seismic isolation device was performed. The temporary horizontal force support means is installed before the column load is transferred from the temporary support material to the seismic isolation device and after the horizontal displacement restraint means for the column is attached.

  On the other hand, Patent Document 2 is known as a technique for reinforcing an existing building. Patent document 2 “Reinforcement structure of existing building” includes a brace with a frame in which a brace is attached in a steel frame in an opening surrounded by a beam and a column of an existing building. Post-installed anchor bolts are driven into the surface of the opening consisting of beams and columns, and a headed stud is provided on the outer periphery of the steel frame. In the reinforcement structure of existing buildings, the space between the beam and column and the steel frame is filled with high tensile strength concrete instead of ordinary concrete.

JP 2007-308979 A Japanese Patent Laid-Open No. 9-317198

  As disclosed in Patent Document 1, the vertical column axial force (column load) is transferred from the existing column (target column) to the temporary support material arranged adjacent to the column, and is exempted from the cut existing column. When seismic devices are installed to make existing buildings seismic isolation, if a large horizontal external force such as seismic force is applied during the period from cutting an existing column to the completion of installation of the seismic isolation device that provides seismic isolation Existing buildings are exposed to danger. In consideration of such a situation, the existing building is provided with a temporary structure for resisting horizontal external force at least during the above period.

  In patent document 1, the brace is installed in the internal space of the column beam frame of an existing building diagonally across between the column beam joints. The ends of the braces are joined to the column beam joints by post-installed anchors. As is well known, the brace supports the horizontal force with the compressive and tensile forces acting in the diagonal direction of the brace, so the post beam anchor is connected to the column beam joint where the brace ends are joined. Thus, a vertical force along the existing pillar and a horizontal force along the existing beam act.

  Since the existing column cannot support the vertical column axial force during the period, it cannot support the vertical force input from the brace. In particular, the vertical force that is transmitted from the brace where the tensile force acts through the post-installed anchor and is input to the column beam joint acts in the direction of pulling out the existing column from the existing beam. Since the existing column cannot support the force in the vertical direction, the end of the brace must be firmly joined to the existing beam in order to resist the pulling action.

  In order to firmly join the end of the brace to the existing beam, the number of post-installed anchors that transmit the force from the brace to the existing beam becomes enormous. When the number of post-construction anchors is enormous, the construction work becomes very large and complicated, and it is difficult to ensure good workability. In addition, if there is not enough space around the beam-column joint or the arrangement of post-installed anchors becomes too dense due to the reinforcements embedded in the existing beams, the required number of post-installed anchors cannot be installed. Such a situation will occur.

  It is conceivable to apply the framed brace disclosed in Patent Document 2 as a temporary structure. A brace with a frame is installed on a column beam frame by joining a steel frame cross member to an existing beam. In this case, the vertical members of the steel frame cannot be joined along the upper and lower sides of the existing column because the temporary support member becomes an obstacle. It is erected between the cross members (existing beams).

  Even if the vertical members can be joined along the top and bottom of the existing columns, the existing columns cannot support the vertical column axial force during the above period, so the horizontal force acts on the vertical members from the brace. The vertical force cannot be borne by existing pillars.

  In the case of a framed brace, the force in the vertical direction is distributed to a certain extent along the steel frame and transmitted to the existing beam. For this reason, compared to Patent Document 1, the post-construction anchors to be constructed can be distributed and arranged, but a large number of post-construction anchors are still required for existing beams, and the force in the vertical direction becomes large. In this case, there is a problem that the necessary number of post-installed anchors cannot be arranged within an effective range that can be resisted by the post-constructed anchors. In addition, in the case of a brace with a frame, in order to transmit the vertical force transmitted from the vertical member to the existing column and the temporary support member, it is necessary to give a strong reinforcement to the existing beam. For this reason, there existed a possibility that material cost and construction cost might become high.

  Moreover, in order to bear the force of an up-down direction with the vertical member of a steel frame, there also existed a problem that the vertical member of a big cross-sectional dimension would be needed.

  The present invention was devised in view of the above-described conventional problems, and the temporary structure is joined to the existing beam by rationally distributing the vertical pull-out force generated through the braces for bearing the horizontal external force. The purpose is to provide a temporary structure during seismic isolation of an existing building that can reduce the construction of post-installed anchors.

  The temporary structure during the seismic isolation construction of the existing building according to the present invention is to install the seismic isolation device in the excision space formed by excising the middle part of the existing column of the column beam structure provided in the existing building, When an existing building is to be seismically isolated, at least from the formation of the excision space until the completion of the installation of the seismic isolation device that can provide seismic isolation, the horizontal beam that acts on the column beam frame while supporting the vertical column axial force It is a temporary structure during seismic isolation of an existing building that supports external force, and is fixedly installed on a pair of upper and lower existing beams of the column beam frame, spaced from the existing columns, and installed on the column beam frame. A rectangular temporary brace frame that supports the acting horizontal external force, a temporary support column that is erected between the temporary brace frame and the existing column and supports the vertical column axial force, and the temporary brace frame, Extend between the upper and lower ends of the temporary strut and the pair of upper and lower existing beams And provided, characterized in that a extended portion for supporting the said temporary supports to transmit the vertical pulling force generated on the temporary braced frames by a horizontal external force.

  The temporary braced frame is provided with a pair of upper and lower frame beams fixed to each of the upper and lower pair of existing beams and a pair of left and right frames that are spaced apart from the pair of left and right existing columns and connect the frame beams in the vertical direction. The frame pillars and braces disposed inside the frame pillars and the frame beams, and the extending portion is provided integrally with the frame beams.

  The extending portion is fixed to the existing beam and reinforces the existing beam.

  The extended portion is characterized in that at least the periphery of the end portion of the temporary support column is fixed to the existing beam to reinforce the existing beam.

  The extended portion is joined to the existing pillar in a horizontal direction.

  In the temporary structure during the seismic isolation construction of the existing building according to the present invention, the temporary structure is converted to the existing beam by rationally distributing the vertical pull-out force generated through the braces for bearing the horizontal external force. It is possible to reduce the construction of post-installed anchors for joining to the steel.

It is a front view which shows suitable one Embodiment of the temporary structure during the seismic isolation construction of the existing building which concerns on this invention. It is explanatory drawing explaining the effect | action of the temporary structure during the seismic isolation construction of the existing building shown in FIG. It is a principal part enlarged view of a column beam frame which shows the modification of the temporary structure in the base-isolation construction of the existing building which concerns on this invention.

  Hereinafter, preferred embodiments of a temporary structure during seismic isolation of an existing building according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a front view of a temporary structure during seismic isolation construction of an existing building according to the present embodiment, and FIG. 2 is an explanatory diagram for explaining the operation of the temporary structure shown in FIG.

  FIG. 1 shows a column beam frame 1 provided in an existing building to be seismically isolated. The existing building may be S, RC or SRC. In the illustrated example, an existing building made of RC is shown. In addition, seismic isolation construction is carried out while the existing building is being used continuously.

  Briefly describing the seismic isolation of existing buildings, the seismic isolation devices 2 are sequentially installed for all or selected existing pillars 3 in the hierarchy where the seismic isolation devices 2 are installed. When there is an existing pillar 3 on which the seismic isolation device 2 is not installed, the existing pillar 3 is divided vertically. In addition, the installed wall is also divided up and down.

  As a result, at the level where the seismic isolation device 2 is installed, the column beam frame 1 including the wall is divided into upper and lower parts, and installed on all existing columns 3 or selected existing columns 3 of the divided column beam frame 1. The seismic isolation device 2 supports the upper layer from the lower layer.

  The installation work of the seismic isolation device 2 is performed according to the following general procedure. First, the temporary support column 5 is installed between the pair of upper and lower existing beams 4 a and 4 b adjacent to the existing column 3. The temporary support column 5 is configured to be extendable in the vertical direction. The temporary support column 5 is extended upward between the pair of upper and lower existing beams 4a and 4b, and the temporary support column 5 is prepared to support the vertical column axial force Fa. Next, the intermediate portion in the vertical direction of the existing pillar 3 is cut out. By the cutting operation, the vertical column axial force Fa is transferred to the temporary column 5, and the temporary column 5 supports the vertical column axial force Fa instead of the existing column 3.

  The seismic isolation device 2 is inserted into the excision space 6 formed by excising the existing pillar 3, and the upper and lower ends of the seismic isolation device 2, respectively, the lower existing pillar part 3 a below the excision space 6 and the upper existing part above the excision space 6. It joins to the column part 3b. When the installation of the seismic isolation device 2 is completed by this joining, the seismic isolation device 2 exhibits the seismic isolation effect. Thereafter, the temporary support column 5 is contracted downward, and the vertical column axial force Fa is transferred to and supported by the existing column 3 where the seismic isolation device 2 is installed.

  When the existing building is seismically isolated as described above, the support action of the vertical column axial force Fa by the existing column 3 is lost, preferably from the formation stage of the excision space 6 to the installation of the seismic isolation device 2. In order to keep the existing building healthy at least until the installation of the seismic isolation device 2 capable of obtaining a seismic isolation action is formed at least before the excision space 6 is formed, a temporary structure is installed on the column beam frame 1 .

  The temporary structure exhibits a function of supporting the vertical column axial force Fa in place of the existing column 3 and a function of supporting the horizontal external force Fb acting on the column beam frame 1. The function of supporting the vertical column axial force Fa is performed by the temporary support column 5. Accordingly, the temporary structure includes the temporary support column 5.

  A rectangular temporary brace frame 7 is provided in the opening in the column beam frame 1. The temporary braced frame 7 is provided on the upper and lower sides of the rectangle, and a pair of upper and lower frame beams 8a and 8b having the same length and the right and left ends of the pair of upper and lower frame beams 8a and 8b are arranged in the vertical direction. A pair of left and right frame pillars 9 of equal length and a brace 10 disposed inside the frame pillars 9 and the frame beams 8a and 8b are connected.

  The temporary brace frame 7 is installed at an opening in the column beam frame 1 by joining a pair of upper and lower frame beams 8 a and 8 b to the pair of upper and lower existing beams 4 a and 4 b of the column beam frame 1. The temporary brace frame 7 is installed on the column beam frame 1 so that the pair of left and right frame columns 9 are located at a distance from the pair of left and right existing columns 3 while avoiding the temporary column 5.

  The temporary brace frame 7 is formed in a rectangular shape by four frame columns 9 and frame beams 8a and 8b. In the illustrated example, an X-type brace is shown as the brace 10. However, as the brace 10, various forms such as K-type, V-type, and Y-type are known, and any form of brace 10 may be incorporated.

  The brace 10 including the structural elements in the oblique direction transmits the horizontal external force Fb applied to the column beam frame 1 from the upper existing beam 4a to the lower existing beam 4b obliquely, and the horizontal external force Fb acts in the axial direction. It supports as compressive force and tensile force to do. The frame column 9, the frame beams 8a and 8b, and the brace 10 of the temporary brace frame 7 are formed of a steel frame material. In the illustrated example, the end portions of the brace members 10a and 10b of the X-type brace 10 are joined to the four corners of the rectangle formed by the frame column 9 and the frame beams 8a and 8b via the bracket 11, respectively.

  Specifically, the temporary brace frame 7 is installed in the column beam frame 1 as follows. A plurality of post-construction anchors 12 are constructed on the lower existing beam 4b along the length direction of the existing beam 4b between the pair of left and right frame columns 9. Next, the non-shrink mortar 13 is constructed on the existing beam 4b below at a height that exposes the upper end of the post-construction anchor 12. A temporary brace frame 7 is installed on the applied non-shrink mortar 13. The temporary braced frame is created by assembling frame beams 8a, 8b and the like in advance. The construction range of the post-construction anchor 12 may be between the existing pillars 3.

  The installed temporary braced frame 7 is fixed on the lower existing beam 4b by fastening the lower frame beam 8b with a nut to the upper end of the post-construction anchor 12. In addition, a plurality of post-construction anchors 12 are constructed on the upper existing beam 4a between the pair of left and right frame columns 9 along the length direction of the existing beam 4a. Next, the upper frame beam 8a is fastened with a nut to the lower end of the post-installed anchor 12, and then the non-shrink mortar 13 is filled in the gap between the frame beam 8a and the existing beam 4a. Is fixed below the existing beam 4a. Also for the upper existing beam 4a, the construction range of the post-construction anchor 12 may be between the existing columns 3.

  The above-mentioned temporary support column 5 is erected between the pair of upper and lower existing beams 4 a and 4 b and between the pair of left and right frame columns 9 and the pair of left and right existing columns 3 of the temporary brace frame 7. As described above, each temporary support column 5 supports the vertical column axial force Fa in place of the existing column 3 at least before the excision space 6 is formed and until the installation of the seismic isolation device 2 capable of obtaining the seismic isolation function is completed. To do.

  The temporary brace frame 7 is provided with extended portions 14a and 14b extending from the existing pillar 3 side. The extending portions 14a and 14b are provided integrally with the pair of upper and lower frame beams 8a and 8b along the existing beams 4a and 4b in the length direction of the frame beams 8a and 8b. Projects to the existing pillar 3 side. The extension portions 14a and 14b may be integrated as a part of the frame beams 8a and 8b, or may be integrated by joining the extension portions 14a and 14b to the frame beams 8a and 8b by various joining methods. .

  The extending portions 14a and 14b are also formed of steel frames. The cross-sectional form of the extending portions 14a and 14b may be the same as the beam frames 8a and 8b, or the cross-sectional secondary moment and the cross-section coefficient are increased or reduced with respect to the beam frames 8a and 8b. It is good also as a form.

  The lower extending portion 14 b is formed with a length that extends from the temporary brace frame 7 to below the lower end portion 5 a of the temporary support column 5. The upper extending portion 14 a is also formed with a length reaching from the temporary brace frame 7 to the upper end portion 5 b of the temporary support column 5. Therefore, the extended portions 14a and 14b are provided to extend between the upper and lower end portions 5a and 5b of the temporary support column 5 and the pair of upper and lower existing beams 4a and 4b, respectively.

  Accordingly, the extending portions 14a and 14b are provided between the existing beams 4a and 4b and the temporary support column 5 on the existing beam 4b on the lower side or the existing beam 4a on the upper side. In other words, the temporary support column 5 is provided between the pair of upper and lower extension portions 14a and 14b installed on the lower existing beam 4b or the upper existing beam 4a.

  Since the temporary support column 5 bears only the vertical force (vertical column axial force Fa), the upper and lower end portions 5a and 5b of the temporary support column 5 are not bonded even if they are bonded to the extended portions 14a and 14b. Also good. The extension parts 14a, 14b projecting from the temporary braced frame 7 are post-installed anchors that transmit force over the entire length in the length direction continuously from the frame beams 8a, 8b, like the beam frames 8a, 8b. 12 and the non-shrink mortar 13 are bonded and fixed to the upper and lower existing beams 4a and 4b, respectively.

  Thereby, the part of the existing beams 4a and 4b between the temporary brace frame 7 and the temporary support column 5 is reinforced by the extended portions 14a and 14b. In addition, the extending portions 14 a and 14 b transmit the forces generated at the four corners of the temporary brace frame 7 in a distributed manner to the temporary support columns 5.

  Next, the operation of the temporary structure during the seismic isolation construction of the existing building according to the present embodiment will be described. As shown in FIGS. 1 and 2, when a horizontal external force Fb such as seismic force is applied to the level of the seismic isolation construction target where the seismic isolation device 2 is installed, the horizontal external force Fb is temporarily installed from the upper existing beam 4 a. It is transmitted to the brace frame 7 and is supported by supporting reaction force on the lower existing beam 4b side.

  When the horizontal external force Fb acts laterally on the existing beam 4a above, the post-construction anchor 12 transmits this horizontal external force Fb to the upper frame beam 8a of the temporary brace frame 7 by a shearing action. In the braced frame 7 in which the horizontal external force Fb is inputted from the upper frame beam 8a, when a compressive force is generated along the axial direction of the brace material 10b (hereinafter referred to as a compressed brace material) that is slanted to the right in the drawing. At the same time, a tensile force is generated along the axial direction of the diagonally downwardly inclined brace material 10a (hereinafter referred to as a tensile brace material).

  In the vicinity of the lower left and upper right corners of the temporary brace frame 7 to which both ends of the tensile brace member 10a are joined, the upper and lower existing beams 4a, A pulling force Fc for pulling up the left frame column 9 from the lower existing beam 4b and pulling down the right frame column 9 from the upper existing beam 4a is generated locally with respect to 4b. The frame column 9 bears a part of the pull-out force Fc.

  In the vicinity of the upper left and lower right corners of the temporary brace frame 7 to which both ends of the compressed brace material 10b are joined, the ends of the compressed brace material 10b are moved up and down via the upper and lower frame beams 8a and 8b. A compressive force Fd that presses against each of the existing beams 4a and 4b is generated. This compressive force Fd obtains a reaction force Fe on the existing beams 4a and 4b and is sufficiently supported by the existing beams 4a and 4b.

  In the present embodiment, since the extension portions 14a and 14b are provided in the temporary brace frame 7, the pull-out force Fc due to the tensile force generated in the tensile brace material 10a is extended around the corners of the temporary brace frame 7. 14a and 14b.

  The area around the lower left corner of the temporary brace frame 7 will be described. The extended portion 14b is fixed to the existing beam 4b below and reinforces the existing beam 4b, while the existing beam 4b and the lower end 5a of the temporary support column 5 are The pull-out force Fc transmitted to the extended portion 14b acts on the temporary support column 5 from the lower end portion 5a of the temporary support column 5 so that the pull-out force Fc is supported by the temporary support column 5. it can.

  That is, since the temporary support column 5 supporting the vertical column axial force Fa bears the action of resisting the extraction force Fc, the vertical column axial force Fa cancels the extraction force Fc, and the lower left corner of the temporary brace frame 7 It is possible to reduce or eliminate the burden of the existing beam 4b supporting the pulling force Fc around the corner.

  The same applies to the area around the upper right corner of the temporary braced frame 7. The extended portion 14 a is fixed to the upper existing beam 4 a to reinforce the existing beam 4 a, and the upper ends of the existing beam 4 a and the temporary support column 5. The pull-out force Fc transmitted to the extended portion 14a acts on the temporary support column 5 from the upper end portion 5b of the temporary support column 5, and the temporary support column 5 supports the extraction force Fc. can do. Thereby, it is possible to reduce or eliminate the burden of the existing beam 4a supporting the pull-out force Fc around the upper right corner of the temporary brace frame 7.

  In other words, the temporary structure during the seismic isolation construction of the existing building according to the present embodiment is a temporary construction without causing the stress on the drawing side borne by the vertical member of the brace with a frame in Patent Document 2 without passing through the existing beams 4a and 4b. The vertical column axis which is transmitted to the support column 5, and the extending portions 14 a and 14 b of the frame beams 8 a and 8 b corresponding to the cross members transmit the drawing side stress to the temporary support column 5, and the temporary support column 5 bears This stress is canceled out by the force Fa, whereby the number of post-installed anchors 12 to be constructed on the existing beams 4a and 4b can be reduced.

  The temporary support column 5 is set so that the vertical axis strength thereof can support both the vertical column axial force Fa and the pull-out force Fc.

  In this way, the pulling force Fc in the vertical direction can be rationally distributed to the temporary support column 5 by the extended portions 14a and 14b of the temporary brace frame 7, thereby reducing the support load of the existing beams 4a and 4b. Therefore, in order to transmit the force generated in the temporary brace frame 7 having the brace 10 that supports the horizontal external force Fb to the existing beams 4a and 4b, it is constructed between the temporary brace frame 7 and the existing beams 4a and 4b. The number of post-installation anchors 12 can be reduced. As a result, temporary material costs and construction costs can be reduced.

  Further, since the pulling force Fc can be distributed to the extending portions 14a and 14b, the pulling force Fc acting on the frame column 9 of the temporary brace frame 7 can be reduced, and the cross-sectional dimension of the frame column 9 can be kept small.

  The extending portions 14a and 14b can be formed as extensions of the frame beams 8a and 8b toward the temporary support column 5, and the configuration of the temporary brace frame 7 is simple, and the existing beams 4a and 8b of the frame beams 8a and 8b are formed. It can be easily installed in the column beam frame 1 in series with the construction to 4b.

  FIG. 3 shows a modification of the above embodiment. FIG. 3 is an enlarged view of a main part of the column beam frame. Although the figure shows the upper left corner of the column beam frame 1, the same applies to the upper right corner.

  In this modification, the upper extending portion 14a is configured such that the periphery of the upper end portion 5b of the temporary support column 5 (indicated by Da in the figure) is fixed to the upper existing beam 4a to reinforce the existing beam 4a. ing. In other words, in the vicinity (indicated by Db in the figure) above the frame column 9 that bears a part of the pull-out force Fc, the post-installed anchor 12 and the mortar 13 are not installed, and therefore, joining and fixing are not performed. A gap 16 is formed between the upper frame beam 8a and the extended portion 14a and the upper existing beam 4a. As for the general portion of the upper frame beam 8a (indicated by Dc in the figure), the post-construction anchor 12 and the mortar 13 are constructed as described above.

  In the present modification, the upper frame beam 8a and the extended portion 14a are not joined to the upper existing beam 4a in the periphery immediately above the frame column 9, so that the pulling force Fc and compressive force borne by the frame column 9 described in the above embodiment are used. Fd is not transmitted to the existing beam 4a. For this reason, if the upper extending portion 14a is fixed to the upper existing beam 4a at least around the upper end portion 5b of the temporary support column 5 so as to reinforce the existing beam 4a, fixing work for other portions is performed. Omitting, the reinforcement range of the upper existing beam 4a can be narrowed, and the number of post-installed anchors 12 can be further reduced. The gap 16 between the frame beam 8a or the extending portion 14a and the existing beam 4a may be more than the deformation caused by the compressive force Fd acting on the frame column 9. The same applies to the relationship between the lower frame beam 8b and the extended portion 14b and the existing beam 4b.

  The upper extending portion 14a may be joined to the existing pillar 3 in the horizontal direction. That is, as shown in the drawing, the horizontal end portion 14c of the upper extension portion 14a is brought into contact with the vertical surface 3c of the existing pillar 3, and the upper extension portion 14a is moved by the post-construction anchor 17 directed horizontally. You may make it join to the existing pillar 3. FIG.

  If comprised in this way, in addition to the post-construction anchor 12 which joins the upper existing beam 4a, the frame beam 8a, and the extension part 14a, by horizontal joining of the upper extension part 14a and the existing pillar 3 by horizontal joining. Furthermore, the horizontal external force Fb can be input to the temporary brace frame 7 more appropriately, and the temporary structure during the seismic isolation construction of the existing building can be functioned more effectively.

  In the seismic isolation construction, there is a case where extra striking is performed to reinforce the existing pillar 3 and the existing beams 4a and 4b. In the present embodiment, the existing pillar 3 and the existing beams 4a and 4b include the increased hitting portion when increased hitting.

DESCRIPTION OF SYMBOLS 1 Column beam frame 2 Seismic isolation device 3 Existing column 4a, 4b A pair of upper and lower existing beams 5 Temporary support | pillar 5a Lower end part of temporary support column 5b Upper end part of temporary support column 6 Cutting space 7 Temporary braced frame structure 8a, 8b A pair of upper and lower frame beams 9 A pair of left and right frame pillars 10 Braces 14a, 14b Extension portion Fa Vertical axis axial force Fb Horizontal external force Fc Vertical pulling force

Claims (5)

When installing the seismic isolation device in the excision space formed by excising the middle part of the existing column of the beam-column frame provided in the existing building and making the existing building seismic isolation, at least from before the excision space is formed Until the completion of the installation of the seismic isolation device that can provide seismic isolation, it is a temporary structure during the seismic isolation of an existing building that supports the horizontal external force acting on the column beam frame while supporting the vertical column axial force. And
A rectangular temporary braced frame that is fixedly installed on a pair of upper and lower existing beams of the column beam frame, spaced apart from the existing columns, and supports horizontal external force acting on the column beam frame, and
A temporary support column which is erected between the temporary brace frame and the existing column and supports vertical column axial force;
The temporary brace frame is provided to extend between the upper and lower ends of the temporary column and the pair of upper and lower existing beams, and transmits the vertical pull-out force generated in the temporary brace frame by a horizontal external force to transmit the temporary column. Temporary structure during seismic isolation construction of an existing building, characterized in that it is provided with an extension part to be supported by   The temporary braced frame is provided with a pair of upper and lower frame beams fixed to each of the upper and lower pair of existing beams and a pair of left and right frames that are spaced apart from the pair of left and right existing columns and connect the frame beams in the vertical direction. 2. The frame column according to claim 1, and a brace disposed inside the frame column and the frame beam, and the extending portion is provided integrally with the frame beam. Temporary structure during seismic isolation of the existing building.   The temporary structure during seismic isolation construction of an existing building according to claim 1, wherein the extended portion is fixed to the existing beam and reinforces the existing beam.   3. The existing building according to claim 1, wherein at least the periphery of the end of the temporary support column is fixed to the existing beam to reinforce the existing beam. Temporary structure.   The temporary structure during the seismic isolation construction of the existing building according to any one of claims 1 to 4, wherein the extended portion is joined to the existing column in a horizontal direction.

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