JP5989597B2 - Temporary seismic structure and its construction method during construction of seismic isolation for existing frame - Google Patents

Description

  According to the present invention, a temporary brace can be appropriately installed on an existing frame equipped with a seismic wall, and the existing frame that can improve safety by improving the seismic performance of the existing frame during the seismic isolation work. The present invention relates to a temporary seismic structure and its construction method during seismic isolation construction.

  In the seismic isolation method for existing buildings, the middle part of the column is cut out to form a space for installing the seismic isolation device between the upper and lower parts of the column. At this time, if a seismic wall is installed, the seismic wall is divided into an upper wall part and a lower wall part by a lateral slit. As a result, the existing building is divided into an upper frame including the upper part of the column and the upper wall part and a lower frame including the lower part of the column and the lower wall part. It can function appropriately between the upper frame and the lower frame.

  On the other hand, during the seismic isolation work construction period after the formation of the installation space and the horizontal slit until the seismic isolation device functions, the existing building becomes vulnerable to earthquakes. A temporary support member that temporarily receives a column load is installed in the space, and other temporary reinforcing members are installed between the upper frame and the lower frame. This type of reinforcement countermeasure technique is disclosed in Patent Document 1.

  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 the column load is transferred from the material to the seismic isolation device, the work for attaching the horizontal displacement restraint means for the column for restricting the functioning of the seismic isolation device is 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. The temporary horizontal force support means is a temporary brace installed in an opening surrounded by columns and beams.

JP 2007-308979 A

  When the building frame is composed of upper and lower beams and left and right columns, the column brace joint around the column head of one column and the column base of the other column are usually used so that the added braces function as braces. Installed diagonally between the column beam joints around the part. The horizontal force input from these beam-column joints acts as an axial force on the brace, and the brace transmits and bears this axial force in an oblique direction. The same applies when the existing frame is reinforced with temporary braces.

  If an opening is not formed in the existing frame to be reinforced with the temporary braces and a seismic wall is installed, the dimensions of the column side surface and the beam lower surface, which are the mounting surfaces of the column beam joints to which the temporary braces are attached, It becomes smaller by the wall thickness of the earthquake resistant wall. As shown in FIG. 4, the width dimension P of the column a is generally wider than the width dimension Q of the beam b, and is stretched from the earthquake resistant wall d having a considerable wall thickness S with respect to the width dimension R of the temporary brace c. Even if the protruding dimension Px of the protruding column can be secured large, the protruding dimension Qx of the beam protruding from the earthquake-resistant wall d is small and narrow.

  If the beam extension dimension Qx is smaller than the width dimension R of the temporary brace c, the temporary brace c is attached to the beam so that the vertical force component (component force) can be sufficiently transmitted from the temporary brace c to the beam b. Cannot be attached to b.

  If the seismic wall d is dismantled and removed to form an opening in the existing frame, a temporary brace c can be installed in the opening. However, dismantling and removing the seismic wall d involves significant noise and vibration, The construction cannot be carried out while staying.

  Thus, it is difficult to properly reinforce the existing frame with the temporary brace c where the earthquake resistant wall d having the wall thickness S is installed and the beam overhanging dimension Qx is smaller than the width dimension R of the temporary brace c. There was a problem of being.

  The present invention was devised in view of the above conventional problems, and it is possible to appropriately install a temporary brace on an existing frame equipped with a seismic wall, and the seismic performance of the existing frame during the seismic isolation construction. The purpose is to provide a temporary seismic structure and its construction method during construction for seismic isolation of existing frames that can improve safety.

  The first of the temporary earthquake-resistant structures during the seismic isolation work of the existing frame according to the present invention is to install a seismic isolation device on the existing frame surrounded by the upper and lower beams and the left and right columns and provided with the earthquake-resistant wall inside. When seismically isolated, the left and right pillars are cut off at the middle to form a space for installing seismic isolation devices between the upper and lower parts of the pillars. Seismic isolation of an existing frame that forms a horizontal slit that divides the earthquake-resistant wall into an upper wall part joined to the upper part of the pillar and a lower wall part joined to the lower part of the pillar. Temporary earthquake-proof structure during construction, straddling the horizontal slit, between the left and right columns, and between the upper column beam joint of one of the columns and the lower column beam joint of the other column The upper part is positioned above the installation space above the installation space, and the lower part is below the installation space below the installation space. Was removed possible joined in position characterized in that a temporary brace unit.

  The second of the temporary seismic structure during the seismic isolation work of the existing frame according to the present invention is to install a seismic isolation device on the existing frame surrounded by the upper and lower beams and the left and right pillars and provided with a seismic wall. When seismically isolated, the left and right pillars are cut off at the middle to form a space for installing seismic isolation devices between the upper and lower parts of the pillars. Seismic isolation of an existing frame that forms a horizontal slit that divides the earthquake-resistant wall into an upper wall part joined to the upper part of the pillar and a lower wall part joined to the lower part of the pillar. A temporary seismic structure during construction, wherein the upper wall and the lower wall when the installation space for the left and right pillars is displaced vertically and their positions do not overlap in the horizontal direction The left and right pillars are separated from any one of the two, and the left and right installation spaces are connected to the lateral slits. A temporary wall constraining plate is formed, in which a vertical slit is formed and the upper and lower ends are detachably joined to the upper wall portion and the lower wall portion, straddling the horizontal slit, and one of these upper wall portion and lower wall portion On the other hand, between the left and right columns and between the upper column beam joint of one of the columns and the lower column beam joint of the other column, the upper part is positioned above the installation space. Thus, the temporary brace unit is provided by joining the lower part so as to be removable at a position below the installation space.

  With respect to the first and second structures, the lower portion of the temporary brace unit is positioned with a gap between the lower slab constructed on the lower beam.

  With respect to the first and second structures, the upper portion of the temporary brace unit is positioned with a gap between the upper beam and the upper beam.

  In contrast to the first and second structures, a jack for transmitting a horizontal force is provided between the upper and lower portions of the temporary brace unit and the upper and lower portions of the column so as to expand and contract in the lateral direction. Features.

  With respect to the first and second structures, the temporary brace unit includes a frame formed by joining a pair of upper and lower cross members to a pair of left and right vertical members, and corner portions of the cross members and the vertical members. And an X-shaped material provided inside the frame body.

  With respect to the first and second structures, the temporary brace unit is characterized in that the upper cross member and the lower cross member are removably joined to the earthquake resistant wall.

  In contrast to the first and second structures, a grout material is filled between the temporary brace unit and the earthquake-resistant wall so as to fill a gap between them.

  The first structure is characterized in that a temporary wall constraining plate having an upper and lower end that is removably joined to the upper wall portion and the lower wall portion across the horizontal slit is provided.

  The first construction method of the temporary seismic structure during the seismic isolation construction of the existing frame according to the present invention is the construction method of the first structure, in which the lateral slit is formed in the seismic wall. An installation process, an installation space construction process for forming the installation space in the left and right pillars, a brace unit installation process for attaching the temporary brace unit over the upper and lower walls of the earthquake-resistant wall, and the installation And a brace unit removing step of removing the temporary brace unit from the earthquake-resistant wall after installing the seismic isolation device in the work space.

  A temporary wall restraint plate is used, the upper and lower ends of which are removably joined to the upper wall portion and the lower wall portion, straddling the horizontal slit, and the temporary wall restraint plate is attached to the seismic resistance before the brace unit mounting step. A wall restraining plate attaching step for attaching to the wall; and a wall restraining plate removing step for removing the temporary wall restraining plate from the earthquake-resistant wall during the brace unit removing step.

  2nd of the construction method of the temporary seismic-proof structure during the seismic isolation construction of the existing frame concerning this invention is a construction method of the said 2nd structure, Comprising: The vertical slit which forms the said vertical slit in the said earthquake-resistant wall A construction process, a transverse slit construction process for forming the transverse slit in the earthquake-resistant wall, an installation space construction process for forming the installation space in the left and right columns, the temporary wall restraint plate, and the temporary brace unit. Wall constraining plate and brace unit attaching step for attaching to the seismic wall, and wall constraining plate and brace unit for removing the temporary wall constraining plate and the temporary brace unit from the seismic wall after installing the seismic isolation device in the installation space. A removal step.

  In the temporary seismic structure and the construction method during the seismic isolation construction of the existing frame according to the present invention, the temporary braces can be appropriately installed on the existing frame equipped with the seismic wall, and the seismic isolation work Safety can be improved by improving the seismic performance of existing frames under construction.

It is a front view of the existing frame during the seismic isolation construction showing the first embodiment of the temporary seismic isolation structure during the construction of the base isolation and the construction method of the existing frame according to the present invention. In FIG. 1, it is an AA arrow directional cross-sectional view. It is a front view of the existing frame in the seismic isolation construction showing the second embodiment of the temporary seismic isolation structure during the seismic isolation construction of the existing frame and the construction method according to the present invention. It is sectional drawing of the beam periphery in the existing frame for demonstrating the conventional subject.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a temporary earthquake-resistant structure and its construction method during construction of seismic isolation for an existing frame according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a front view of an existing frame during a seismic isolation construction to which the temporary seismic isolation structure during the seismic isolation construction of the existing frame according to the first embodiment and its construction method are applied, and FIG. 1 is a cross-sectional view taken along line AA in FIG. Hereinafter, it demonstrates according to a construction procedure. The upper, lower, left and right in the description are the upper, lower, left and right in the drawing.

  When the existing frame 5 composed of the upper and lower beams 1 and 2 and the left and right columns 3 and 4 is to be isolated, the seismic isolation device 6 is incorporated in the columns 1 and 2 as is well known in the art. The existing frame 5 is constructed in various structural formats such as RC structure and SRC structure. A floor slab 7 made of RC or the like is integrally constructed on the lower beam 2. The present embodiment is intended for an existing frame 5 in which a seismic wall 8 is provided in an interior surrounded by upper and lower beams 1 and 2 and left and right columns 3 and 4. The earthquake-resistant wall 8 is also constructed by RC construction or the like, and is integrally joined to the columns 3 and 4 and the beams 1 and 2.

  In the existing frame 5 equipped with the seismic wall 8, before the seismic isolation device 6 is installed in the columns 3 and 4 to make the seismic isolation, the horizontal slit construction process for forming the horizontal slit 9 that divides the seismic wall 8 in the vertical direction Is implemented. The horizontal slit 9 is formed in the horizontal direction in parallel with the upper and lower beams 1 and 2 in accordance with the height position of the installation space 10 of the seismic isolation device 6 formed in the next process. It is divided into an upper wall portion 8 a on the horizontal slit 9 and a lower wall portion 8 b below the horizontal slit 9.

  Next, the installation space construction process which forms the installation space 10 of the seismic isolation apparatus 6 in the right and left pillars 3 and 4 is performed. The installation space 10 has a height dimension for inserting the seismic isolation device 6 and cuts the middle part of the pillars 3 and 4 between the upper parts 3a and 4a and the lower parts 3b and 4b. It is formed with a considerable height dimension. In the installation space 10, and if necessary, seismic isolation is provided between the upper and lower beams in the vicinity of the columns 3 and 4 (between the upper and lower beams shown in the cross section in FIG. 1). Until the installation work of the device 6 is completed, a temporary support material (not shown) that temporarily supports the column load in the vertical direction is installed. The support of the vertical force component (component force) during the seismic isolation work is mainly handled by this temporary support material.

  The installation space 10 is set at a height position of the horizontal slit 9 so as to be connected to the horizontal slit 9. In other words, the horizontal slit 9 is formed in accordance with the height position of the installation space 10. Thereby, the installation space 10 for the left and right columns 3 and 4 is connected by the horizontal slit 9. Due to the formation of the lateral slits 9 and the installation space 10, the seismic wall 8 is obtained by integrally joining the left and right edges to the upper portions 3 a and 4 a of the left and right columns 3 and 4 and the upper edge to the upper beam 1. The wall 8a is divided into left and right edges at the lower portions 3b and 4b of the left and right columns 3 and 4, and a lower edge is divided into a lower wall 8b integrally joined to the lower beam 2.

  By this division, the lower structure comprising the lower wall portion 8b, the lower beam 2 and the lower portions 3b, 4b of the columns 3, 4, and the upper structure comprising the upper wall portion 8a, the upper beam 1, and the upper portions 3a, 4a of the columns 3, 4 Are structurally independent, and by installing the seismic isolation device 6 in the installation space 10, the layer including the existing frame 5 becomes a seismic isolation layer. The vertical dimension of the horizontal slit 9 is such that the upper portions 3a and 4a of the columns 3 and 4 expected when the installation space 10 for the seismic isolation device 6 is formed, that is, the upper slit portion 9a sinks. Is set to such an extent that can not be blocked.

  Next, a wall restraint plate attachment process for attaching the temporary wall restraint plate 11 is performed across the upper wall portion 8a and the lower wall portion 8b of the earthquake resistant wall 8 across the horizontal slit 9 in the vertical direction. The temporary wall restraint plate 11 is formed of a metal plate material such as steel. The temporary wall restraint plate 11 is bolted (indicated by reference numeral 12 in the drawing) so that the upper end can be removed from the upper wall 8a and the lower end can be removed from the lower wall 8b.

  In the bolt joining, a nut may be fastened to a bolt penetrated through a bolt hole penetrating from the front side to the back side of the earthquake-resistant wall 8, or a nut may be fastened to an anchor bolt embedded in the earthquake-resistant wall 8. Good. Further, when removing the temporary wall restraint plate 11, the nut may be removed from the bolt, or the bolt may be broken.

  In the illustrated example, a plurality of temporary wall constraining plates 11 are installed along the horizontal slit 9 at intervals. The temporary wall restraint plate 11 exhibits the function of restraining the relative displacement between the upper wall portion 8a and the lower wall portion 8b until the installation of the seismic isolation device 6 is completed, thereby reinforcing the earthquake resistance. The temporary wall restraint plate 11 may be attached as necessary, and may not be attached.

  Next, a brace unit attaching step for attaching the temporary brace unit 13 is performed over the upper wall portion 8a and the lower wall portion 8b of the earthquake resistant wall 8. The temporary brace unit 13 is configured by incorporating a pair of diagonal members 14a and 14b obliquely with respect to the vertical direction and the left and right direction, and incorporating the diagonal members 14a and 14b inside the frame body 15.

  The frame 15 is composed of a pair of left and right vertical members 16 and 17 and a pair of upper and lower horizontal members 18 and 19. The left and right ends of the horizontal members 18 and 19 are joined to the upper and lower ends of the vertical members 16 and 17, respectively. Configured. The diagonal members 14a and 14b are bridged diagonally between the corners of the frame 15 formed by assembling the vertical members 16 and 17 and the cross members 18 and 19 in a right-down or left-down direction. Provided. Accordingly, the diagonal members 14a and 14b are arranged in an X shape inside the frame body 15 and constitute an X-shaped material. The vertical members 16, 17, the cross members 18, 19, and the diagonal members 14a, 14b are formed of a section steel such as an H-section steel.

  In the illustrated example, the X-shaped material composed of the diagonal materials 14a and 14b is composed of two short materials constituting the other diagonal material 14a with respect to one long diagonal material 14b as shown in the figure. It is formed by abutting materials and integrally joining them.

  The temporary brace unit 13 is provided between the left and right columns 3 and 4 and is provided on the earthquake resistant wall 8 across the horizontal slit 9. Specifically, the temporary brace unit 13 has an X-shaped material composed of a pair of left and right vertical members 16 and 17 and a pair of diagonal members 14 a and 14 b straddling the horizontal slit 9 in the vertical direction, and is placed above the temporary brace unit 13. The upper cross member 18 positioned is positioned on the upper wall portion 8a, and the lower cross member 19 positioned lower is positioned on the lower wall portion 8b.

  The diagonal members 14a and 14b of the temporary brace unit 13 are provided between the upper column beam joint of one column 3 (4) and the lower column beam junction of the other column 4 (3). The upper column beam joint is a joint between the upper portions 3a and 4a of the columns 3 and 4 and the upper beam 1 around the column heads of the columns 3 and 4, and the lower column beam joint is a column base of the columns 3 and 4. This is a joint between the lower portions 3 b and 4 b of the columns 3 and 4 and the lower beam 2 around the portion.

  The diagonal member 14a that is inclined downward to the right is between the upper column beam joint of the left column 4 and the lower column beam junction of the right column 3, and the diagonal member 14b that is downwardly inclined is the upper column beam joint of the right column 3. And the lower column beam joint of the left column 4. The diagonal members 14a and 14b are preferably arranged along a straight line connecting the upper column beam joint and the lower column beam joint.

  The temporary brace unit 13 has an upper upper member 18 disposed at an upper position relative to the upper wall portion 8a with respect to the installation space 10, and a lower lower member 19 disposed therebelow for the lower wall portion 8b. It is arranged at a position below the space 10. The temporary brace unit 13 is attached to the seismic wall 8 with the upper cross member 18 bolted to the upper wall portion 8 a and the lower cross member 19 to the lower wall portion 8 b (indicated by reference numeral 20 in the figure). The diagonal members 14 a and 14 b and the longitudinal members 16 and 17 are not joined to the earthquake resistant wall 8. The bolt connection to the upper wall portion 8a and the like of the upper cross member 18 and the like is the same as that of the temporary wall restraining plate 11 described above, and the temporary brace unit 13 is removably bonded to the earthquake resistant wall 8.

  Further, the lower part of the temporary brace unit 13 (the lower cross member 19) is provided to the lower beam 2 and the floor slab so that no stress is applied to the lower beam 2 and particularly to the floor slab 7 constructed on the lower beam 2. 7 with a gap between them. When the temporary brace unit 13 is installed directly on the lower beam 2 with the wall thickness of the seismic wall 8 and the overhanging width being narrow, the temporary brace unit 13 protrudes on the floor slab 7, thereby causing the floor slab 7 to bear stress. Since there is a risk of damage, the temporary brace unit 13 is installed with a gap from the floor slab 7. Thereby, damage to the floor slab 7 can be prevented.

  The upper part (upper horizontal member 18) of the temporary brace unit 13 is arranged with a gap between the upper beam 1. Although it is possible to install the temporary brace unit 13 in close contact with the upper beam 1, since high mounting accuracy is required, and as shown in FIG. Even if they are in close contact with each other, the force component in the vertical direction cannot be sufficiently transmitted, so that the temporary brace unit 13 is installed with a gap from the upper beam 1. Thereby, the installation work of the temporary brace unit 13 can be completed in a short time with an easy operation, and the unprotected period of the existing frame 5 can be shortened to improve the safety.

  Between each end position of the upper cross member 18 and the lower cross member 19 constituting the frame 15 of the temporary brace unit 13 and the column side surfaces of the upper portions 3a, 4a and the lower portions 3b, 4b of the columns 3, 4, A jack 21 is provided which is extendable in the lateral direction. The jack 21 is made of metal having higher rigidity than concrete, and transmits a horizontal force between the upper portions 3 a and 4 a and the lower portions 3 b and 4 b of the columns 3 and 4 and the temporary brace unit 13.

  The temporary brace unit 13 can be appropriately provided on the earthquake-resistant wall 8 while the lateral installation position of the temporary brace unit 13 is freely adjusted by the expansion and contraction action of the jack 21. Further, the jack 21 can appropriately transmit the horizontal force between the temporary brace unit 13 and the upper portions 3a and 4a and the lower portions 3b and 4b of the columns 3 and 4, and the temporary brace unit 13 is surely loaded. be able to.

  The vertical members 16 and 17 of the temporary brace unit 13 can be installed in close contact with the upper portions 3a and 4a and the lower portions 3b and 4b of the columns 3 and 4, and in this case, the jack 21 is unnecessary. As with the relationship between the upper beam 1 and the upper cross member 18, high mounting accuracy is required. By using the jack 21 and installing the temporary brace unit 13 with a gap from the upper portions 3a and 4a and the lower portions 3b and 4b of the pillars 3 and 4, the installation work can be completed in a short time with easy work. Thus, the unprotected period of the existing frame 5 can be shortened to improve safety.

  When the temporary brace unit 13 is installed by directly attaching the vertical members 16 and 17 to the upper portions 3a and 4a of the pillars 3 and 4 without using the jack 21, the bolts are joined to each other between the two. It is filled with grout material and thereby firmly integrated. In this case, through holes are provided in the columns 3 and 4, and it is necessary to repair the columns 3 and 4 after the temporary brace unit 13 is removed.

  As described above, the horizontal force acting on the existing frame 5 is input to the temporary brace unit 13 directly from the upper portions 3 a and 4 a and the lower portions 3 b and 4 b of the columns 3 and 4 or via the jack 21. The horizontal force input to the temporary brace unit 13 acts on the diagonal members 14a and 14b as an axial force in the diagonal direction, and the vertical force component thereof is a bolt applied to the upper and lower horizontal members 18 and 19. It is transmitted from the upper wall portion 8a or the lower wall portion 8b to the upper beam 1 or the lower beam 2 through the joint.

  The horizontal force that is mainly input to the temporary brace unit 13 is loaded by the X-shaped material composed of the diagonal members 14a and 14b. Therefore, the frame 15 surrounding the X-shaped material that functions as a brace functions as an X-shaped material mounting jig that replaces the upper and lower column beam joints of the existing frame 5, which is a general mounting position for braces. To do.

  Cross members 18 and 19 for transmitting and receiving a vertical force component for mounting and fixing the temporary brace unit 13 to the earthquake-resistant wall 8 and also when the diagonal members 14a and 14b bear a horizontal force as an axial force. A gap is set between the upper wall portion 8a and the lower wall portion 8b, and the cross members 18, 19 and the upper wall portion 8a and the lower wall portion 8b are firmly integrated in the gap therebetween. For this purpose, at least the bolt joint range is filled with the grout material. Of course, the grout material may be filled over the entire installation range of the cross members 18 and 19. The grout material is also filled in the bolt holes for bolt joining.

  If the frame 15 that can function as a mounting jig is not required, the temporary brace unit 13 may be configured only by the X-shaped material configured by the diagonal members 14a and 14b. In this case, the upper and lower ends of the diagonal members 14a and 14b are in contact with the upper part 3a (4a) of the one pillar 3 (4) and the lower part 4b (3b) of the other pillar 4 (3), thereby And the upper end and the lower end are integrally joined to the upper wall portion 8a and the lower wall portion 8b to secure the temporary brace unit 13 to the seismic wall 8. Thereby, transmission of the force of an up-down direction is also securable.

  By the temporary construction described above, the temporary earthquake-proof structure during the construction of the seismic isolation of the existing frame 5 is completed. When an earthquake or the like occurs during the seismic isolation work, the horizontal force acting on the upper portions 3a and 4a of the columns 3 and 4 is input to the temporary brace unit 13 via the jack 21, and the temporary brace unit 13 While the horizontal force is borne, it is transmitted to the lower portions 3b and 4b of the pillars 3 and 4, and the lower beam 2 and the like can catch this. In addition, the vertical component of the oblique force flowing through the temporary brace unit 13 is also transmitted to the lower wall portion 8b via the lower cross member 19 of the frame 15, and is received by the lower beam 2, whereby the pillar 3 , 4 can be transmitted to the lower parts 3b, 4b.

  Next, the seismic isolation device 6 is installed in the installation space 10, and the bases 3 and 4 are seismically isolated between the upper portions 3a and 4a and the lower portions 3b and 4b. And

  Next, a brace unit removal step for removing the temporary brace unit 13 from the earthquake resistant wall 8 is executed. Then, the wall restraint plate removal process which removes the temporary wall restraint plate 11 is performed, and a temporary support material is removed. In these steps, the temporary brace unit 13 and the temporary wall restraint plate 11 are removed from the seismic wall 8 by, for example, destroying the bolted portion. The removed temporary brace unit 13 and temporary wall restraint plate 11 can be diverted to other construction sites.

  In the temporary seismic structure and the construction method during the seismic isolation construction of the existing frame according to the first embodiment, the horizontal slit 9 is straddled between the left and right pillars 3 and 4 and one pillar. 3 (4) is positioned between the upper column beam joint of the other column 4 and the lower column beam joint of the other column 4 (3), and the upper part is positioned above the installation space 10 on the upper wall part 8a, and the lower part is Since the temporary brace unit 13 is provided on the lower wall portion 8b so as to be removable at a position below the installation space 10, a seismic wall is installed, and the overhang dimension of the beam is larger than the width dimension of the temporary brace. When a small existing frame is reinforced with temporary braces, etc., the installation and fixing of the temporary brace unit 13 that bears the horizontal force, etc., is secured appropriately to the earthquake-resistant wall 8, thereby making the base isolation work The seismic performance of the existing frame 5 under construction can be improved to improve safety.

  Since the upper part of the temporary brace unit 13 is joined to the upper wall part 8a at a position above the installation space 10, and the lower part is joined to the lower wall part 8b at a position below the installation space 10, the upper parts 3a, 4a, the upper beam 1 and the upper wall portion 8a, and the lower structures 3b and 4b of the columns 3 and 4, the lower beam 2 and the lower wall portion 8b. The temporary brace unit 13 can appropriately transmit and bear the burden.

  That is, since the metal-made high-strength temporary brace unit 13 is attached to the upper wall portion 8a and the lower wall portion 8b made of RC concrete, the upper portions 3a, 4a and the lower portions 3b, The horizontal force acting on 4b is not limited to the concrete of the upper wall portion 8a and the like, but without being restricted by the concrete strength, directly from the columns 3 and 4 or via the high-rigid jack 21 made of metal, It can be supported by the temporary brace unit 13 and the stress that can be borne by the existing frame 5 can be increased structurally, so that an excellent earthquake resistant structure can be configured.

  Since the temporary brace unit 13 is provided so as to be removable, the function of the existing frame 5 can be restored by removing it after the seismic isolation by the seismic isolation device 6, and the temporary brace unit 13 can be transferred to another construction site. can do. In addition, the generation of large noise is about the bolt construction, and the construction can be performed while staying.

  A frame 15 formed by joining the temporary brace unit 13 to a pair of left and right vertical members 16 and 17 and a pair of upper and lower cross members 18 and 19, and corners of these cross members 18 and 19 and the vertical members 16 and 17. Since the X-shaped material (diagonal materials 14a and 14b) provided inside the frame body 15 by being joined to the corners, the frame body 15 is made up of the diagonal materials 14a and 14b that bear the force in the horizontal direction. It can be used as a jig for attaching a letter-shaped material, and can be installed in the existing frame 5 in an easy work in a short time, reducing the unprotected period of the existing frame 5 and safety Can be improved.

  Also, the frame 15 can bear the horizontal and vertical forces, and can effectively reinforce the existing frame 5 during the seismic isolation construction to provide an earthquake resistant structure.

  In the temporary brace unit 13, since the upper cross member 18 and the lower cross member 19 are joined to the earthquake resistant wall 8, it is possible to ensure a wide joining area of the temporary brace unit 13 to the upper wall portion 8a and the lower wall portion 8b. The unity of both can be improved and structural safety can be ensured high.

  Between the temporary brace unit 13 and the seismic wall 8 is filled with a grout material that fills the gap between the two, ensuring the transmission of the force between the two and ensuring excellent seismic performance and high strength. Can be secured.

  Since the temporary wall restraint plate 11 is provided so that the upper and lower ends are detachably joined to the upper wall portion 8a and the lower wall portion 8b across the horizontal slit 9, the relative displacement between the upper wall portion 8a and the lower wall portion 8b is restricted. It is possible to generate a resistance force to reduce the load burden on the temporary brace unit 13 and to improve the structural performance of the temporary earthquake-resistant structure configured by including the temporary brace unit 13.

  The temporary brace unit 13 may be installed only on one side of the earthquake-resistant wall 8 or may be installed on both surfaces of the earthquake-resistant wall 8. The temporary brace unit 13 and the temporary wall restraining plate 11 may be joined to the upper wall portion 8a and the lower wall portion 8b by a grout injection into a gap between them or a gap between a bolt and a bolt hole, or It is good also as friction welding by a high strength bolt.

  The temporary seismic structure and its construction method during the seismic isolation construction of the existing frame according to the present embodiment, as shown by the two-dot chain line in FIG. 1, the seismic wall 8 includes the opening 22. Even so, it can be applied appropriately. In this case, the temporary brace unit 13 and the temporary wall restraint plate 11 are attached and fixed to the upper wall portion 8a and the lower wall portion 8b without being joined at the position of the opening 22.

  Next, a description will be given of a second embodiment of the temporary earthquake-resistant structure during the seismic isolation work for the existing frame according to the present invention. FIG. 3 is a front view of the existing structure during the seismic isolation construction to which the temporary seismic structure and the construction method thereof are applied during the seismic isolation construction of the existing frame according to the second embodiment. Hereinafter, a description will be given centering on differences from the first embodiment.

  When the existing frame 5 is located between the living room and the staircase, the installation height position of the seismic isolation device 6 with the left and right columns 3 and 4 when the seismic wall 8 is located at the boundary of different structural types Need to be changed. 2nd Embodiment respond | corresponds to the case where the space 10 for installation of the seismic isolation apparatus 6 shifts up and down, and those positions do not overlap in the left-right lateral direction by the left and right pillars 3 and 4.

  In such a case, the longitudinal slit construction process which forms the longitudinal slit 23 in the earthquake-resistant wall 8 is performed before a lateral slit construction process. The vertical slit 23 is formed to separate the left and right columns 3 and 4 from either the upper wall portion 8a or the lower wall portion 8b formed by dividing the earthquake resistant wall 8 by the horizontal slit 9.

  In the illustrated example, the seismic wall 8 and the upper portions 3a and 4a of the left and right columns 3 and 4 are maintained to be separated from the lower portions 3b and 4b of the columns 3 and 4 in a later process. A pair of left and right vertical slits 23 are formed from the formation position of the installation space 10 to be constructed to the lower beam 2 along the lower portions 3b and 4b of the pillars 3 and 4. Each vertical slit 23 is connected to the installation space 10 in a subsequent process. Of course, the seismic wall 8 may be separated from the upper portions 3a and 4a of the columns 3 and 4 while maintaining the connection between the seismic wall 8 and the lower portions 3b and 4b of the columns 3 and 4.

  Next, a horizontal slit construction process is executed. The horizontal slit 9 of the first embodiment is formed in the horizontal direction in parallel with the upper and lower beams 1 and 2 so as to connect the left and right installation spaces 10, but in the second embodiment, the horizontal slit 9 9 cannot directly connect the left and right installation spaces 10. The horizontal slit 9 of the second embodiment is formed in the horizontal direction in parallel along the upper and lower beams 1 and 2 so as to be connected to the left and right vertical slits 23. Thereby, the horizontal slit 9 is connected to the left and right installation spaces 10 via the left and right vertical slits 23.

  When the seismic wall 8 is separated from the lower portions 3b and 4b of the columns 3 and 4, the horizontal slit 9 is formed at a position lower than the installation space 10 and from the upper portions 3a and 4a of the columns 3 and 4. When separating, it is formed at a position above the installation space 10.

  When the seismic wall 8 is separated from the lower portions 3b and 4b of the columns 3 and 4 as in the illustrated example, the upper wall portion 8a divided by the horizontal slit 9 is divided into the upper portions 3a and 4a of the columns 3 and 4 and the upper portions. The lower wall portion 8b is joined to the lower beam 2 only. The vertical slit 23 may be stopped at the position where the horizontal slit 9 is formed so that the joined state between the lower wall portion 8b and the lower portions 3b and 4b of the columns 3 and 4 can be maintained. In this construction stage, since the columns 3 and 4 are not divided into the upper parts 3a and 4a and the lower parts 3b and 4b, the existing frame 5 has a considerable strength.

  Next, the installation space construction process which forms the installation space 10 of the seismic isolation apparatus 6 in the right and left pillars 3 and 4 is performed similarly to 1st Embodiment. By forming the installation space 10, the lower structure comprising the lower wall portion 8 b, the lower beam 2 and the lower portions 3 b and 4 b of the columns 3 and 4, and the upper wall portion 8 a, the upper beam 1 and the upper portions 3 a and 4 a of the columns 3 and 4. By installing the seismic isolation device 6 in the installation space 10, the hierarchy provided with the existing frame 5 becomes a seismic isolation layer.

  Then, the wall restraint plate and brace unit attachment process which attaches the temporary wall restraint plate 11 and the temporary brace unit 13 to the earthquake-resistant wall 8 is performed. Either the temporary wall restraint plate 11 or the temporary brace unit 13 may be attached in advance, but in order to stabilize the structure of the upper wall portion 8a and the lower wall portion 8b divided by the horizontal slit 9 at an early stage, the temporary wall It is preferable to attach the restraint plate 11 first. The temporary wall restraint plate 11 is attached in the same manner as in the first embodiment.

  About attachment of the temporary brace unit 13 in 2nd Embodiment, it is the same as that of 1st Embodiment except the point which does not straddle the horizontal slit 9. FIG. The temporary brace unit 13 that does not straddle the lateral slit 9 is inevitably provided on the upper wall portion 8a or the lower wall portion 8b adjacent to the installation space 10 so as to be joined from the upper position to the lower position of the installation space 10. On the other hand, it is installed on the upper wall portion 8a in the illustrated example.

  The temporary construction described above completes the temporary earthquake-resistant structure during the seismic isolation work for the existing frame. The difference in the structural form between the second embodiment and the first embodiment is that, in the first embodiment, the lower walls 3b and 4b of the columns 3 and 4 and the lower wall portion 8b are bonded to the lower beam 2. On the other hand, in the illustrated example of the second embodiment, the lower wall portion 8 b is separated from the lower portions 3 b and 4 b of the columns 3 and 4 and joined only to the lower beam 2.

  Although the structural form is different, even in the second embodiment, when an earthquake or the like occurs during the seismic isolation work, the horizontal force applied to the upper portions 3a, 4a of the columns 3, 4 The temporary brace unit 13 transmits the force in the horizontal direction to the lower portions 3b and 4b of the columns 3 and 4 so that the lower beam 2 and the like can catch it. . Further, the vertical component of the oblique force flowing through the temporary brace unit 13 is transmitted from the frame 15 to the lower wall portion 8b via the upper wall portion 8a and the temporary wall restraining plate 11, and is received by the lower beam 2. Thus, transmission to the lower portions 3b and 4b of the columns 3 and 4 is possible. When maintaining the connection between the lower wall portion 8b and the lower portions 3b and 4b of the columns 3 and 4, the structure is almost the same as that of the first embodiment.

  Thereafter, as in the first embodiment, the seismic isolation device 6 is installed in the installation space 10 from which the temporary support material has been removed. As a result, the bases 3 and 4 are seismically isolated between the upper portions 3a and 4a and the lower portions 3b and 4b, and the existing frame 5 is made a seismic isolation layer. Subsequently, a brace unit removing process for removing the temporary brace unit 13 from the earthquake-resistant wall 8 and a wall restricting plate removing process for removing the temporary wall restricting plate 11 are executed.

  In the temporary earthquake-proof structure during the seismic isolation construction of the existing frame and the construction method according to the second embodiment, the left and right columns 3 and 4 are connected to either the upper wall portion 8a or the lower wall portion 8b. While separating, the vertical slit 23 which connects the installation space 10 on either side and the horizontal slit 9 is formed, and the upper and lower ends are joined to the upper wall part 8a and the lower wall part 8b so that removal is possible across the horizontal slit 9. A temporary wall restraining plate 11 and an upper column beam joint of one column 3 (4) between the left and right columns 3 and 4 and the other of the upper wall portion 8a and the lower wall portion 8b. It is located between the lower column beam joints of the other column 4 (3), and is temporarily installed by removing the upper part at a position above the installation space 10 and the lower part at a position below the installation space 10. Since the brace unit 13 is provided, a seismic wall is installed, and the overhang dimension of the beam lower surface is When an existing frame smaller than the width of the installed brace is reinforced with a temporary brace or the like, the installation space 10 of the left and right columns 3 and 4 is displaced vertically so that their positions do not overlap in the horizontal direction. Even in this case, as in the first embodiment, the temporary brace unit 13 that bears a horizontal force and the like is appropriately secured and secured to the seismic wall 8, thereby making the seismic isolation work It is possible to improve the seismic performance of the existing frame and improve safety.

  Furthermore, it is needless to say that the second embodiment exhibits various functions and effects exhibited by the first embodiment.

  The temporary brace unit 13 and the temporary wall restraint plate 11 can be removed immediately after the seismic isolation device 6 is installed on the columns 3 and 4 connected to the seismic wall 8 to be installed or all the columns 3 and 4 of the seismic isolation layer are exempted. It may be after installing the seismic device 6. Moreover, in the said embodiment, although the upper and lower cross members 18 and 19 of the temporary brace unit 13 joined to the earthquake-resistant wall 8 are made into H-shaped steel, the flange surface is arrange | positioned in parallel facing the earthquake-resistant wall 8, These cross members 18 and 19 may be channel steel or the like. In this case, the web surface may be arranged in parallel with the earthquake resistant wall 8.

1, 2 Beams 3, 4 Pillars 3a, 4a Column upper part 3b, 4b Column lower part 5 Existing frame 6 Seismic isolation device 7 Floor slab 8 Seismic wall 8a Upper wall part 8b Lower wall part 9 Horizontal slit 10 Installation of seismic isolation system Space 11 Temporary wall restraint plate 13 Temporary brace unit 14a, 14b Diagonal material 15 Frame body 16, 17 Vertical material 18, 19 Horizontal material 21 Jack 23 Vertical slit

Claims (12)

When installing a seismic isolation device on an existing frame surrounded by upper and lower beams and left and right pillars, and installing seismic isolation walls, the middle part of these left and right pillars is cut off and the upper part of the pillars A space for installing a seismic isolation device between the upper and lower portions, and connecting the left and right installation spaces to the seismic wall and joining the seismic wall to the upper part of the column and the column A temporary earthquake-resistant structure during the seismic isolation work of the existing frame that forms a horizontal slit that divides into the lower wall part joined to the lower part of
The upper wall portion is positioned between the left and right columns and between the upper column beam joint of one of the columns and the lower column beam joint of the other column across the horizontal slit. The existing frame is provided with a temporary brace unit which is detachably joined to the lower wall portion at a position above the installation space and at a position below the installation space. Temporary earthquake-resistant structure during construction. When installing a seismic isolation device on an existing frame surrounded by upper and lower beams and left and right pillars, and installing seismic isolation walls, the middle part of these left and right pillars is cut off and the upper part of the pillars A space for installing a seismic isolation device between the upper and lower portions, and connecting the left and right installation spaces to the seismic wall and joining the seismic wall to the upper part of the column and the column A temporary earthquake-resistant structure during the seismic isolation work of the existing frame that forms a horizontal slit that divides into the lower wall part joined to the lower part of
The left and right columns are separated from either the upper wall portion or the lower wall portion when the installation spaces of the left and right columns are vertically displaced and their positions do not overlap in the horizontal direction. And forming a vertical slit connecting the left and right installation spaces and the horizontal slit,
A temporary wall restraint plate is provided across the horizontal slit so that the upper and lower ends are removably joined to the upper wall portion and the lower wall portion,
Either one of the upper wall part and the lower wall part is positioned between the left and right columns and between the upper column beam joint of one of the columns and the lower column beam joint of the other column. Under construction of seismic isolation work for an existing frame, wherein a temporary brace unit is provided by removably joining the upper part at a position above the installation space and the lower part at a position below the installation space. Temporary earthquake resistant structure.   The lower part of the temporary brace unit is positioned with a gap between it and a floor slab constructed on the lower beam. Temporary earthquake resistant structure.   The upper part of the temporary brace unit is positioned with a gap between the upper beam and the temporary beam during temporary seismic isolation construction of the existing frame according to any one of claims 1 to 3. Seismic structure.   The jack which transmits horizontal force is provided between the upper part and the lower part of the said temporary brace unit, and the upper part and the lower part of the said column so that expansion and contraction is possible in the horizontal direction. Temporary earthquake-resistant structure during construction of seismic isolation of the existing frame described in the section.   The temporary brace unit is provided inside the frame by joining a pair of upper and lower vertical members to a pair of upper and lower horizontal members, and joining the horizontal members and the corners of the vertical members. The temporary earthquake-proof structure during construction of the base-isolated construction of the existing frame according to any one of claims 1 to 5, wherein the temporary-frame structure is constructed of an X-shaped material.   The seismic isolation work for an existing frame according to any one of claims 1 to 6, wherein the temporary brace unit is configured such that the upper cross member and the lower cross member are removably joined to the earthquake-resistant wall. Temporary earthquake resistant structure during construction.   8. The seismic isolation work for an existing frame according to claim 1, wherein a grout material filling a gap between the temporary brace unit and the earthquake-resistant wall is filled. Temporary earthquake resistant structure during construction.   2. The seismic isolation of an existing frame according to claim 1, further comprising a temporary wall constraining plate that is detachably joined to the upper wall portion and the lower wall portion across the horizontal slit. Temporary earthquake-resistant structure during construction. A construction method for a temporary earthquake-resistant structure during the construction of the seismic isolation of the existing frame according to claim 1,
The horizontal slit construction process for forming the horizontal slit in the earthquake-resistant wall, the installation space construction process for forming the installation space in the left and right pillars, and the temporary installation over the upper wall portion and the lower wall portion of the earthquake-resistant wall A brace unit attaching step for attaching the brace unit, and a brace unit removing step for removing the temporary brace unit from the earthquake-resistant wall after installing the seismic isolation device in the installation space. Temporary seismic structure construction method during seismic construction. Using the temporary wall restraint plate, which straddles the horizontal slit, the upper and lower ends are removably joined to the upper wall portion and the lower wall portion,
A wall restraint plate attaching step for attaching the temporary wall restraint plate to the earthquake resistant wall before the brace unit attaching step, and a wall restraint plate for removing the temporary wall restraint plate from the earthquake resistant wall during the brace unit removing step. The construction method of the temporary earthquake-proof structure during the seismic isolation construction of the existing frame of Claim 10 characterized by including a removal process. A construction method for a temporary earthquake-resistant structure during the construction of the seismic isolation of the existing frame according to claim 2,
A vertical slit construction process for forming the vertical slit in the earthquake-resistant wall, a horizontal slit construction process for forming the horizontal slit in the earthquake-resistant wall, and an installation space construction process for forming the installation space in the left and right pillars A step of attaching the temporary wall restraining plate and the temporary brace unit to the seismic wall, and a step of attaching the temporary wall restraining plate and the temporary brace unit after installing the seismic isolation device in the installation space. A method for constructing a temporary earthquake-resistant structure during the seismic isolation work of an existing frame, comprising a wall restraining plate and a brace unit removing process for removing from the earthquake-resistant wall.

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