JP6038754B2 - Seismic isolation method for existing structures - Google Patents

Description

  In the present invention, a seismic isolation device is newly installed in any layer such as the foundation of an existing structure, and the existing structure is exempted from the upper structure separated from the lower structure in the installation layer of the seismic isolation device. It relates to seismic structuring methods.

  When installing a base isolation device on a part of the frame of any layer, such as the foundation of an existing structure that is not a base isolation structure, and converting the upper structure separated from the lower structure sandwiching the base isolation device into the base isolation structure, In the object, a part of the existing column is removed while temporarily supporting the vertical load of the upper structure divided vertically with the installation layer of the seismic isolation device on the jack installed around the column By doing so, a seismic isolation device is installed (see Patent Documents 1 to 4). Since the seismic isolation device is installed for the purpose of improving the seismic performance of the superstructure and safety in the event of an earthquake, the installation layer of the seismic isolation device is either the foundation or the ground floor.

  When the space around the pillar where the seismic isolation device is installed is open as in Patent Documents 1 to 4 and the column communicates with the outdoors, the seismic isolation device is installed around the column. Space for carrying in equipment and equipment and performing work is secured, and this space also serves as a route (space) for evacuation during work, so safety during installation of seismic isolation devices is also secured. I can say that.

  On the other hand, for example, there is an upper slab above the space where the installation layer of the seismic isolation device is partitioned by a column and a partition wall connected to the adjacent column, and a lower slab (pressure plate) below. In this case, the space defined by the pillar and the partition wall becomes a closed space (double pit) sandwiched between the upper and lower slabs, and this closed space does not communicate with the outdoors. Safety during work is not ensured.

  In this way, when the space divided by the pillar and the partition becomes a closed space by the upper and lower slabs, the seismic isolation device is installed in the closed space and the partition space is divided into the upper structure and the lower structure. At least an opening as a route for carrying in equipment and equipment required for installing the seismic isolation device must be formed.

  However, it is not sufficient to secure an evacuation route if an opening is formed in one of the bulkheads facing the closed space where the seismic isolation device is installed, and an earthquake or fire may be encountered during the work. Since it cannot be said that safety in an emergency (emergency) has been secured, there are few examples of installing seismic isolation devices in enclosed spaces.

  As an example of installing a seismic isolation device in a closed space (double pit), there is a method of forming an opening in a partition wall connected to a column and installing the seismic isolation device in the opening (see Patent Document 5).

JP-A-8-270255 (Claim 1, paragraphs 0010 to 0016, FIGS. 1 to 6 and FIGS. 8 to 12) JP-A-8-338155 (Claim 1, paragraphs 0014 to 0018, FIGS. 1 to 3) Japanese Patent Laid-Open No. 10-299263 (paragraphs 0013 to 0017, FIGS. 2 to 5) JP 2001-311314 A (Claim 1, paragraphs 0022 to 0033, FIGS. 1 to 3) JP-A-10-292737 (Claim 1, paragraphs 0009 to 0026, FIGS. 1, 2, and 10 to 13)

  In Patent Document 5, for the purpose of making it unnecessary to use the jack used for installing the seismic isolation device in Patent Documents 1 to 4 (paragraph 0006), the vertical structure of the upper structure until the installation of the seismic isolation device is completed. By applying a load to the column (paragraph 0028), a method of installing a seismic isolation device on the partition wall (base beam) from which the column was intentionally removed is adopted (claim 1).

  However, this method requires that the vertical load borne by the divided pillars be shared equally among a plurality of seismic isolation devices arranged around the pillars (paragraph 0012, FIG. 1-B, FIG. 2-). B) There will be a new problem that the number of seismic isolation devices is more than doubled compared to the case where the seismic isolation devices are installed at the column positions.

  In Patent Document 5, only a part of a partition wall (foundation beam) constituting a closed space (double pit) is cut and removed for installation of a seismic isolation device (paragraph 0026, 11), until the installation of the seismic isolation device in the closed space is completed, the problem of securing the evacuation route facing the worker who stays in the closed space has not been solved.

  In view of the above background, the present invention provides an existing structure that allows the seismic isolation device to be installed at the position of an existing pillar while solving the problem of securing an evacuation route when installing the seismic isolation device in a closed space. We propose a seismic isolation method.

The seismic isolation structuring method for an existing structure according to claim 1 includes a closed space defined by a plurality of columns arranged at intervals in two horizontal directions and a partition wall connected to an adjacent column. In any layer of the existing structure arranged in the two horizontal directions,
An opening is formed in any of the partition walls facing the outside of any one of the layers, and the partition wall that separates the closed space and the adjacent closed space from the closed space formed by the partition wall in which the opening is formed. After the operation of forming the opening is repeated and the entire closed space is communicated, the vertical load of the upper structure on any one of the layers borne by each pillar is temporarily supported by the partition wall or jack Then, a part of the pillar is cut and removed, and a seismic isolation device is installed in the removal section of the pillar.

  “Any layer of an existing structure” refers to a layer where seismic isolation devices are installed among all layers including the foundation of the existing structure. A closed space is often a foundation because it is composed of double pits consisting of a partition wall erected between adjacent columns and slabs that are vertically opposed to each other, but may be an arbitrary floor on the ground. Existing structures are divided into an upper structure and a lower structure with a seismic isolation device in between.

  When the openings are formed from the outdoors toward each closed space, for example, as shown in FIG. 2A, after the openings are formed in any partition facing the outdoors, the partitions are configured. A next opening is formed in the partition wall that separates the closed space from any of the adjacent closed spaces. By repeating this operation, the entire closed space communicates with the adjacent closed space through the opening, and also communicates with the outdoors. A closed space including a partition wall facing the outside communicates directly with the outdoors by forming an opening in the partition wall, or indirectly communicates with the outside through a closed space including the partition wall first formed with the opening. To do. The closed space on the back side that is far from the outside communicates indirectly with the outside through a closed space closer to the outdoors. As a result, the entire enclosed space communicates directly or indirectly with the outside through the opening of the partition wall.

  When all the enclosed spaces communicate with the outdoors directly or indirectly, an evacuation route that leads to the outdoors from the all enclosed spaces is formed as a result. Prior to the installation work of the seismic isolation devices on the pillars, an emergency evacuation route from all the enclosed spaces to the outside is formed, so that emergency situations during the installation work of the seismic isolation devices in each enclosed space (emergency) Therefore, the environment for safely performing the work of cutting and removing the pillar to install the seismic isolation device in a part of the pillar in the enclosed space is prepared. As a result, the problem of securing the evacuation route that is faced when installing seismic isolation devices in a specific layer of an existing structure where multiple enclosed spaces are arranged in two horizontal directions is solved, ensuring safety during work. Under such circumstances, it is possible to start and carry out the work of installing seismic isolation devices on some of the pillars of a specific layer.

  For example, as shown in FIG. 2- (a), the procedure for forming the opening for communicating the entire closed space with the outside is a one-stroke drawing from any closed space 3 facing the outside to the entire closed space 3 being passed. The case of proceeding in the manner is a method for efficiently communicating the entire closed space 3, but the procedure for forming the opening 4 for communicating the entire closed space 3 is not limited thereto. For example, in the closed space 3 that is farthest from the outside on a one-stroke path, one opening 4 is formed as an evacuation passage that leads to the adjacent closed space 3, and the opening 4 is first formed. One opening 4 is also formed in the closed space 3 facing the front, and the intermediate closed space 3 has openings 4, 4 at two locations, the partition wall 2 located at the outdoor side and the partition wall 2 located at the far side. Is formed.

  In order for the opening 4 to serve as a passage for carrying in materials and equipment necessary for installing the seismic isolation device 6 during the installation work of the seismic isolation device 6 and to serve as an evacuation passage in an emergency, the partition wall 2 The position where the openings 4 are formed is not questioned, and the number of openings 4 facing each closed space 3 is not questioned. The opening 4 in this case does not necessarily assume the case where the jack 5 is installed around the pillar 1.

  In the case of one-stroke drawing from the closed space 3 facing the outdoors to the closed space 3 on the back side, two openings facing each closed space 3 are formed except for the closed space 3 that has reached the end. As shown in FIG. 2- (b), the opening 4 was formed by proceeding with two strokes from two different partition walls 2, 2 to different closed spaces 3, 3 on the back side facing the outdoors. In some cases, three or more openings 4 facing each closed space 3 are formed. In the case of FIG. 2- (b), the number of the openings 4 facing the closed space 3 finally reached by one stroke is three, and the number of the openings 4 facing the other closed spaces 3 is four. It has become a piece.

  If the result of the procedure shown to FIG. 2- (b) is seen, the opening 4 and 4 will be formed in the at least 2 different partition 2 and 2 which face the outdoors, and the opening 4 which faces each closed space 3 will be at least 3 pieces. (Claim 2). Since the opening 4 here serves as a carry-in path and an escape path, it is formed before the pillar 1 is cut in claim 1. In this case, the final exit to the outdoors is two openings 4 formed in the partition wall 2 facing the outdoors, but there are two or more routes to reach the exit, and work is performed during evacuation. Since a situation where a person can evacuate in a distributed manner on a plurality of routes is ensured, safety during installation of the seismic isolation device 6 in each closed space 3 is improved.

  Until the installation of the seismic isolation device 6 is completed, when the jack 5 supports the vertical load of the upper structure 7 separated from the lower structure 8 by cutting the pillar 1, the opening 4 formed around the pillar 1. Can be used as a space for installing the jack 5 (Claim 4). In that case, openings 4 are formed in a plurality of partition walls 2 connected to one pillar 1. For example, when the jack 5 is installed around the middle pillar 1c to which the four partition walls 2 are connected, the jack 5 is used in order to equally apply the vertical load on the pillar 1 on the upper structure 7 side to the plurality of jacks 5. Since it is appropriate to arrange them symmetrically with respect to the center on the cross section of the pillar 1, it is necessary to form the openings 4, 4 in at least two partitions 2, 2.

  “Temporarily supporting the vertical load of the upper structure on the partition wall” in claim 1 means that the partition wall 2 connected to the column 1 has a sufficient thickness as a load-bearing wall, and the vertical load of the upper structure 7 is substituted for the column 1. When having the ability to bear, it means that the vertical load of the upper structure 7 is temporarily supported on the plurality of partition walls 2 around the pillar 1 from the cutting of the pillar 1 to the installation of the seismic isolation device 6. In that case, the partition wall 2 can bear the vertical load of the upper structure 7 as in the new wall of JP2012-177282A, and the vertical load of the upper structure 7 that the column 1 should bear can be temporarily supported. However, it is not always necessary to install the jack 5 around the column 1, and the position of the opening 4 in the partition wall 2 is not limited as described above, and the position and number of the openings 4 to be secured around the column 1 are not limited. I will not. However, in order to increase the load capacity of the partition wall 2 for the sake of safety, the partition wall 2 may be reinforced to increase the wall thickness, and the jack 5 may be used in combination to supplement the vertical load bearing capacity of the partition wall 2. There is also.

  When the vertical load of the upper structure 7 above the pillar 1 to be cut is temporarily supported by the jack 5 installed around the pillar 1 until the installation of the seismic isolation device 6 is completed, the opening 4 causes the jack 5 to In order to be used as a space for installation, it is appropriate that the opening 4 is formed at a location close to the pillar 1 (Claim 3).

  Since the opening 5 is formed at a location close to the pillar 1, the jack 5 can be installed at a location close to the pillar 1, so the burden on the upper structure 7 and the lower structure 8 that receives the reaction force of the jack 5 ( There is an advantage that the bending moment is reduced. The reaction force of the vertical load of the upper structure 7 borne by the jack 5 acts on the upper structure 7 and the lower structure 8, but the load concentrates on the contact portion (leg part) of the jack 5, thereby forming the closed space 3. Since it is difficult to install the jack 5 between the upper and lower slabs 71, 81, the jack 5 is left by the formation of the opening 4 and is installed between the remaining portions of the partition wall 2 separated above and below the opening 4 (Claim 4). . In this respect, the opening 4 has a role as a space for installing the jack 5 in addition to the role as the carry-in path and the escape passage. The “remaining part of the partition wall 2” refers to the partition wall 2 left after the opening 4 is formed, and the jack 5 includes the lower surface of the partition wall 2 on the upper structure 7 side facing the opening 4 and the partition wall 2 on the lower structure 8 side. It will be installed between the top surfaces.

  “Formed at a location close to the column 1” means that the opening 4 is formed in contact with the side surface of the column 1 or passes through a position close to the side surface of the column 1 as shown in FIG. That the opening 4 is formed. When the opening 4 is formed at a location in contact with the pillar 1, the opening 4 of each partition wall 2 connected to the pillar 1 continues through the removed portion of the pillar 1 when the pillar 1 is cut. Even when the opening 4 is not in contact with the pillar 1, by simultaneously cutting and removing the opening 4 to the pillar 1 when the pillar 1 is cut, the pillar 1 is removed in the same manner as when the opening 4 is in contact with the pillar 1. After the cutting, the openings 4 of the partition walls 2 connected to the pillars 1 are continuous.

  When the opening 4 is formed at a location close to the pillar 1, the jack 5 is arranged symmetrically with respect to the center on the cross section of the pillar 1 in order to evenly apply the load of the upper structure 7 to the plurality of jacks 5. For this reason, the opening 4 is formed in the partition walls 2 and 2 which are symmetric with respect to the center of the column 1 except for the corner column 1a. It is suitable to form in four places. “Two openings 4 are formed with respect to the center of the pillar 1” means that the openings 4 and 4 are formed in the two partition walls 2 and 2 that are arranged symmetrically with the pillar 1 in between. 1 becomes the side pillar 1b or the middle pillar 1c. “The four openings 4 are formed” means that the four partitions 2 arranged symmetrically in two directions with the pillar 1 in between are opened as shown in FIGS. 3B and 5C. 4 is formed, and its pillar 1 becomes the middle pillar 1c.

  If the pillar 1 is the side pillar 1b, three partitions 2 are connected to the pillar 1 in two directions, but openings 4 and 4 are formed in the two partitions 2 and 2 in one direction facing the outdoors. For example, since two openings 4 and 4 are formed with respect to the center of the cross section of the pillar 1, the jack 5 can be arranged symmetrically with respect to the center of the pillar 1. Four partition walls 4 are connected to the middle pillar 1c in two directions, but the two openings 4, 4 are formed in two partition walls 2, 2 which are continuous in either direction and sandwich the pillar 1. The In the middle pillar 1c, when the openings 4 are formed in the four partition walls 2 in two directions, four openings 4 are formed.

  Although two partition walls 2 and 2 are connected to the corner pillar 1a in two directions, the direction of the partition wall 2 in each direction is different, so that an opening 4 is formed in the partition wall 4 that forms a pair with respect to the center of the cross section of the column 1. Can not do it. In this case, the jack 5 is installed in the openings 4 and 4 of the two partition walls 2 and 2 having different directions, but the upper part of the two pillars 5 and 5 is near the pillar 1 that is divided. When the load of the structure 7 cannot be stably supported, as shown in FIG. 9- (a), at least one of the outdoor side surfaces paired with the partition wall 2 on the lower structure 8 side and the upper structure 7 side. Auxiliary blocks 15, 15 for receiving the jack 5 are installed or constructed. When the auxiliary block 15 is installed at a position that is paired with the two partition walls 2 and 2 connected to the corner post 1a, the jack 5 can be installed at four places around the corner post 1a. The auxiliary blocks 15 and 15 receive the jack 5 in a state of being vertically paired on the lower structure 8 side and the upper structure 7 side.

  As shown in FIG. 9- (b), the auxiliary block 15 may be installed at a position to be paired with the partition wall 2 other than the partition wall 2 facing the outside, which is connected to the side column 1b. It can be installed at four locations around the pillar 1b. Note that when the load of the upper structure 7 is applied to the partition wall 2, the jack 5 is not necessarily used, and thus the auxiliary block 15 is not necessarily installed.

  When the auxiliary block 15 is installed on the surfaces of the corner pillar 1a and the side pillar 1b on the outdoor side, the circumferential direction of the pillar 1 is similar to the situation (FIGS. 4 and 5) when the jack 5 is installed on the middle pillar 1c. The reinforcing blocks 11 and 12 are constructed or installed between the partition walls 2 and 2 adjacent to each other, between the partition wall 2 and the auxiliary block 15, and between the auxiliary blocks 15 and 15 (Claim 5).

  When installing seismic isolation devices by dividing existing pillars, there are usually no parts where jacks should be installed around the pillars, so the jacks are divided between the upper structure side pillars and the lower structure side pillars. It will be installed between upper and lower blocks such as concrete added around (Patent Documents 3 and 4). On the other hand, in the present invention, when the vertical load of the upper structure 7 is supported by the jack 5 as described above, the jack 5 is installed in the opening 4 serving as the carry-in path formed in the partition wall 2 and the escape passage ( In order to secure a place where the jack 5 is installed, it is not always necessary to construct a block as in Patent Documents 3 and 4.

  For this reason, a space other than the place where the jack 5 is installed is used as a space for moving materials or the like, or as a space for ensuring the stability of the partition wall 2 in the installed state of the jack 5, or after the seismic isolation device is installed. It is possible to use as a space for reinforcing the upper structure and the lower structure, for example, for installing reinforcing blocks 11 and 12 described later. Therefore, in order to efficiently carry out the installation work of the seismic isolation device 5 in the limited space secured in the closed space 3, the stability and safety of the upper structure 7 and the lower structure 8 after the seismic isolation device 5 is installed. There is an advantage that it can be used effectively for securing.

  By forming the opening 4 in the partition wall 2, the lower surface of the partition wall 2 on the upper structure 7 side and the upper surface of the partition wall 2 on the lower structure 8 side become surfaces facing the opening 4 side as described above. It is installed between the lower surface facing the opening 4 on the 7 side and the upper surface facing the opening 4 on the lower structure 8 side, and both axial end portions (leg portions) are temporarily fixed to each surface. When the jack 5 is installed in the opening 4, the entire jack 5 fits within the width of the opening 4, and when the jack 5 is stored in the partition wall 2, the jack 5 itself protrudes into the closed space 3. Therefore, the installation work of the seismic isolation device 6 in the closed space 3 is not hindered.

  The seismic isolation device 6 is inserted between the lower surface of the column 1 on the upper structure 7 side and the upper surface of the column 1 on the lower structure 8 side through the space of the opening 4 with the jack 5 installed in the opening 4. However, as shown in FIGS. 6 and 7, the width of the openings 4, 4 on both sides of the pillar 1 in the horizontal direction and the width of the removed portion of the pillar 1 is the size of the seismic isolation device 6. If the dimensions are sufficiently larger than the width, the jack 5 does not become an obstacle when the seismic isolation device 6 is installed.

  When the jack 5 is installed in the opening 4, the stability of the jack 5 in the installed state of the jack 5 or the partition 2 that receives the jack 5 depends on the width of the partition wall 2 (width of the inner peripheral surface of the opening 4). When the stability is not sufficiently ensured, the reinforcing blocks 11 and 12 for securing the stability of the jack 5 or the partition 2 are added to the partition 2 (Claim 5). Specifically, as shown in FIGS. 4 and 5, the lower structure separated from the upper structure 7 between the partition walls 2 and 2 adjacent in the circumferential direction of the pillar 1 on the upper structure 7 side separated above and below the opening 4. Reinforcement blocks 11 and 12 are constructed or installed between the partition walls 2 and 2 adjacent to the circumferential direction of the column 1 on the eighth side (Claim 5).

  The reinforcement blocks 11 and 12 are constructed by a cast-in-place concrete structure, or are installed in the partition wall 2 by joining precast concrete or steel blocks. The block is bonded to the partition wall 2 by, for example, pressure bonding using PC steel or the like. In either case, the reinforcement blocks 11 and 12 are joined to the partition wall 2, but are also joined to the upper slab 71 on the upper structure 7 side and the lower slab 81 on the lower structure 8 side at the same time, and the reinforcement block 11 on the upper structure 7 side. Is integrated with the partition wall 2 and the upper slab 71, and the reinforcing block 12 on the lower structure 8 side is integrated with the partition wall 2 and the lower slab 81.

  A plurality of reinforcing blocks 11 and 12 are connected to the column 1 on the upper structure 7 side divided by the formation of the opening 4 by straddling between the partition walls 2 and 2 formed with the opening 4 adjacent to each other in the circumferential direction of the column 1. The partition wall 2 and the upper slab 71 are integrated, and the plurality of partition walls 2 and the lower slab 81 connected to the column 1 on the lower structure 8 side are integrated. As a result, while increasing the rigidity of each partition wall 2 of the upper structure 7 and the lower structure 8, the transmission capacity of the vertical load and the horizontal load from the upper structure 7 to the seismic isolation device 6 is enhanced, It also serves to increase the transmission capacity of vertical and horizontal loads. The reinforcement blocks 11 and 12 are constructed even when the vertical load of the superstructure 7 is borne by the partition wall 2 from the operation of the reinforcement blocks 11 and 12 until the installation of the seismic isolation device 6 is completed. There is.

  When installing the seismic isolation device 6 between the divided lower surface of the column 1 on the upper structure 7 side and the upper surface of the column 1 on the lower structure 8 side, for example, FIG. 7, the upper foundation 9 and the lower foundation 10 for fixing the upper flange 61 and the lower flange 62 of the seismic isolation device 6 may be constructed or installed. In this case, since the jack 5 is housed in the opening 4 of the partition wall 2, the horizontal length of the entire opening corresponding to the opening 4, 4 on both sides sandwiching the column 1 and the removed portion of the column 1 is obtained. If the size corresponding to the width of the upper foundation 9 and the lower foundation 10 is secured, and the jack 5 is installed on the opposite side of the pillar 1 in the opening 4, the upper foundation 9 and lower section having a cross-sectional area larger than that of the pillar 1 It is possible to construct the foundation 10 or the like. Accordingly, it is possible to install the seismic isolation device 6 having a cross-sectional area larger than that of the column 1.

  After an opening is formed in one of the partition walls facing outdoors, the entire closed space is formed by repeating the operation of forming the next opening in the partition wall separating the closed space formed by the partition wall and any one of the adjacent closed spaces. Can be communicated directly or indirectly to the outdoors, so that an evacuation route can be formed from the entire enclosed space to the outdoors prior to the installation work of the seismic isolation device on the pillar. As a result, preparation work and installation work for installing the seismic isolation device can be performed in a situation where safety in an emergency (emergency) is ensured in each closed space.

It is the top view which showed the condition where the closed space was arranged in two horizontal directions in either layer of the existing structure. (A) The top view which showed the path | route at the time of forming the opening which connects all the closed spaces by one-stroke path | route from the partition connected to a corner pillar in the some closed space shown in FIG. 1, (b) [FIG. 6] is a plan view showing a path when an opening that connects the all pillars is connected to the side pillar and communicates with the entire closed space by two-stroke paths from different partitions. (A) is a longitudinal sectional view of the partition wall showing a state before the opening to the partition wall connected to the middle pillar, (b) is a state in which the opening is formed at a position in contact with the partition wall column shown in (a). It is the longitudinal cross-sectional view shown. (A) is a longitudinal sectional view showing a state in which a reinforcing block is constructed (installed) around a partition wall on a lower slab (pressure plate) on the lower structure side after FIG. The longitudinal cross-sectional view which showed a mode that the reinforcement block was constructed | assembled (installed) around the partition under the upper slab used as the upper structure side, (c) is covering the whole surface of a lower slab as a modification of the reinforcement block of (a). It is the longitudinal cross-sectional view which showed a mode that the reinforcement block was constructed | assembled. (A) is a longitudinal sectional view showing a state in which a jack is installed in the opening of the partition wall formed in FIG. 3 after FIG. 4- (b) and the vertical load of the upper structure is temporarily supported by the jack, (b) Is a longitudinal sectional view showing a state before cutting and removing a part of a column surrounded by an opening, and (c) is a sectional view taken along line xx of (a). (A) is a longitudinal sectional view showing a state in which a part of the pillar cut in FIG. 5- (b) is removed and a lower base plate that receives the lower flange of the seismic isolation device is installed on the pillar on the lower structure side. b) is a longitudinal sectional view showing a state in which a lower base for fixing the lower base plate to the column on the lower structure side is constructed, and anchors of the lower base plate are embedded in the lower base and the reinforcing block. 6A is a longitudinal sectional view showing a state in which the seismic isolation device is installed on the lower base plate after FIG. 6B, and FIG. 6B is an upper base for fixing the upper base plate that receives the upper flange of the seismic isolation device. It is the longitudinal cross-sectional view which showed a mode that was built under the pillar of the upper structure side, and the anchor of the upper baseplate was embed | buried in the upper foundation and the reinforcement block. (A) is a longitudinal sectional view showing a state where the temporary support state of the jack is released after FIG. 7- (b) and the vertical load of the superstructure is borne by the seismic isolation device, and (b) is continuous with the opening. It is the longitudinal cross-sectional view which showed a mode that the slit was horizontally formed in the partition to perform, and the partition was isolate | separated into the upper structure side and the lower structure side. (A) is a horizontal sectional view showing a state where an auxiliary block that is paired with a partition wall is sandwiched between corner columns on the outdoor side of the corner column, and a jack is installed between the upper and lower auxiliary blocks, (b) is a side column It is the horizontal sectional view which showed a mode that the auxiliary block which makes a pair with the partition on the indoor side was installed in the outdoor side, and the jack was installed between the upper and lower auxiliary blocks.

  FIG. 1 shows an existing structure in which a closed space 3 defined by a plurality of pillars 1 arranged at intervals in two horizontal directions and a partition wall 2 connected to adjacent pillars 1 and 1 is arranged in two horizontal directions. The plane of the layer in which any seismic isolation device 6 is installed is shown. FIG. 1 shows a part of planes, for example, a quarter of the entire plane of any layer of an existing structure. One closed space 3 is connected to four pillars 1 and adjacent pillars 1, a partition wall 2 laid between the pillars 1, and an upper slab 71 of the upper structure 7 connected to the heads of the pillars 1 and legs of the pillars 1. The lower slab 81 of the lower structure 8 is configured. The partition wall 2 is connected to the column 1, the upper slab 71 and the lower slab 81.

  2 (a) and 2 (b), an opening 4 is formed in any partition wall 2 facing the outside of any layer shown in FIG. 1, and a closed space formed by the partition wall 2 in which the opening 4 is formed. 3 shows a state in which the operation of forming the opening 4 in the partition wall 2 separating the closed space 3 and the adjacent closed space 3 is repeated so that the entire closed space 3 is communicated and communicated outdoors.

  FIG. 2- (a) starts the formation of the opening 4 from the closed space 3 (facing the corner column 1a) including any partition wall 2 connected to the corner column 1a, and is completely closed by one-stroke path. A route when the opening 4 for communicating the space 3 is formed is shown. The path that allows all the closed spaces 3 to communicate with each other with a single stroke path does not repeatedly pass through the same closed space 3 from the closed space 3 facing the corner post 1a to the closed space 3 that reaches the end. This is an example of a procedure for communicating all the closed spaces 3 with the shortest route. However, since one evacuation route is formed by one progression, an emergency ( It is also a way to ensure safety in an emergency.

  FIG. 2- (b) starts the formation of the opening 4 from different closed spaces 3 and 3 (facing the side columns 1b and 1b) including different partition walls 2 and 2 connected to different side columns 1b and 1b. A route in the case of forming the opening 4 that allows the entire enclosed space 3 to communicate with each other in a one-stroke path is shown. By connecting all the enclosed spaces 3 with two routes, a plurality of evacuation routes are formed, so the safety before the installation of the seismic isolation device 6 is improved from the state of FIG. To do. In FIG. 2B, the openings 3 are formed in at least two different partition walls 2 and 2 facing the outdoors, and at least three openings 3 facing each closed space 3 are formed.

  After all the closed spaces 3 are communicated with each other and communicated outdoors, as shown in FIGS. Are removed by cutting a part of the pillar 1 in a state where it is temporarily supported by a plurality of partition walls 2 or jacks 5 connected to each pillar 1, and a seismic isolation device 6 is installed in the removal section of the pillar 1. The upper structure 7 is seismically isolated by performing the work.

  Hereinafter, the work procedure from the formation of the opening 4 around the column 1 to the separation of the upper structure 7 and the lower structure 8 after the installation of the seismic isolation device 6 will be described with reference to FIGS. The pillar 1 shown in FIGS. 3 to 8 is the middle pillar 1c. However, when the jack 5 bears the vertical load of the upper structure 7, the side pillar 1b and the corner pillar 1a are also shown in FIG. ~ The operation shown in Fig. 8 is performed. In the corner pillar 1a and the side pillar 1b, the openings 4 and 4 are not paired across the pillar 1, but the upper foundation 9 and the lower foundation 10 for fixing the seismic isolation device 6 to the upper structure 7 and the lower structure 8 are upper. When it is necessary to construct the lower surface of the column 1 on the structure 7 side and the upper surface of the column 1 on the lower structure 8 side, the upper foundation 9 and the lower foundation 10 need a cross-sectional area exceeding the cross-sectional area of the column 1 It is necessary to install (construct) reinforcing blocks 11 and 12 on the upper structure 7 side and the lower structure 8 side, respectively. In that case, the same work as the work around the middle pillar 1c is performed also in the corner pillar 1a and the side pillar 1b.

  3 (a) shows the state before the opening 4 is formed in the partition wall 2 connected to the pillar 1, but the installation work of the seismic isolation device 6 as shown in FIGS. 2- (a) and (b). Before the transition to, one or more openings 4 as evacuation routes are formed in any partition wall 2 facing each closed space 3, so that most pillars 1 are formed after the evacuation route is formed. An opening 4 is formed in any connected partition wall 2. In the case of FIG. 2- (a), an opening 4 has already been formed in any partition wall 2 connected to the pillar 1 except for a part of the pillars 1. In the case of FIG. An opening 4 has already been formed in any partition 2 to be connected. If the work shown in FIG. 2- (b) is completed at the stage before starting the installation work of the seismic isolation device 6, the partition wall 2 shown in cross section in FIG. An opening 4 is formed in the partition wall 2 on the opposite side across the column 1.

  From the state of FIG. 3- (a), as shown in (b), the opening 4 is formed in the partition 2 other than the partition 2 in which the opening 4 is formed. The opening 4 is a jack that supports the vertical load of the upper structure 7 when the seismic isolation device 6 is installed, in addition to the function as a carry-in path for materials and equipment for installation of the seismic isolation device 6 and an emergency evacuation route. 5 has a function as a storage space for installing. Below, the work procedure in the case where the opening 4 also serves as a storage space for the jack 5 will be described.

  In order to temporarily support the vertical load of the upper structure 7 on the jack 5, the openings 4 are basically arranged in pairs with the pillar 1 interposed therebetween. Since the seismic isolation device 6 is inserted between the pillar 1 on the upper structure 7 side and the pillar 1 on the lower structure 8 side separated in the state where the jack 5 is installed in the opening 4, the opening 4 is a pillar in the horizontal direction. It has a width that allows the seismic isolation device 6 to be inserted in the horizontal direction in a state where the jacks 5, 5 are arranged on both sides of 1. When the pillar 1 is cut, since the openings 4 and 4 on both sides sandwiching the pillar 1 and the space after the removal of the pillar 1 are continuous in the horizontal direction, the horizontal width of the opening 4 is the width of the openings 4 and 4 on both sides. It becomes the sum of the widths of the pillars 1. The height of the opening 4 is a size corresponding to the height of the jack 5 when the jack 5 is jacked up.

  In order to make the space after the removal of the pillar 1 and the openings 4 and 4 on both sides continuous when the pillar 1 is cut, the opening 4 is a section where the pillar 1 is removed when the pillar 1 is cut, and both sides sandwiching the pillar 1 As shown in FIG. 3B, the openings 4 and 4 are formed at locations close to the pillar 1 such as locations in contact with the pillar 1. Since four partition walls 2 are connected to the middle pillar 1c in two directions, basically the openings 4 are formed in the four partition walls 2 so that the vertical load of the upper structure 7 is equally applied to the jack 5 around the pillar 1. Is formed. “Basically” means that it is not always necessary to form the openings 4 in the four partition walls 2 when the formation of the openings 4 in the two partition walls 2 and 2 arranged in one direction is sufficient. Similarly, in the corner pillars 1a and the side pillars 1b, openings 4 are formed in all partition walls 2 connected to the pillars 1, and jacks are not provided on the side where the partition walls 2 are not connected as shown in FIGS. 9 (a) and 9 (b). Auxiliary block 15 forming a space for installing 5 is installed or constructed.

  After the formation of the openings 4 in all the partitions 2 connected to the pillars 1, in the circumferential direction of the pillars 1 on the upper structure 7 side separated above and below the openings 4 as shown in FIGS. The reinforcing blocks 11 and 12 are constructed or installed between the adjacent partition walls 2 and 2 and between the partition walls 2 and 2 adjacent to each other in the circumferential direction of the column 1 on the lower structure 8 side. In FIG. 4, the construction of the reinforcement block 12 on the lower structure 8 side is preceded and the reinforcement block 11 on the upper structure 7 side is constructed after the construction of the reinforcement block 12 and the like. Such operations may be performed in parallel with the reverse case.

  FIG. 4- (a) shows a case where the reinforcing block 12 having a width larger than the width of the opening 4 is constructed on the lower slab (pressure plate) 81 of the lower structure 8 constituting the closed space 3, but FIG. (C) shows an example in which the reinforcing block 12 is continuously constructed on the entire surface of the lower slab 81. In the example of FIG. 4- (c), the overall plate thickness of the lower slab 81 is increased. Therefore, for example, a reinforcing block effective when an upward load such as water pressure is applied to the lower surface of the lower slab 81. There are 12 construction examples.

  The reinforcing blocks 11 and 12 are installed across the partition walls 2 and 2 adjacent to each other in the circumferential direction of the column 1 on the upper structure 7 side and the lower structure 8 side, respectively, as shown in FIG. It is constructed and integrated with both partition walls 2, 2, and the adjacent partition walls 2, 2, that is, all the partition walls 2 connected to the pillars 1 are integrated. The reinforcing blocks 11 and 12 are made of steel or precast concrete in advance, or are constructed of cast-in-place concrete. If it is manufactured in advance, it may be divided for convenience of delivery. In the case of concrete or the like, the reinforcing blocks 11 and 12 are integrated with the partition wall 2 by, for example, crimp bonding using a PC steel material or the like. In FIG. 5- (c), a dashed-two dotted line shows the lower foundation 10 which fixes the lower flange 62 of the seismic isolation apparatus 6 mentioned later. On the lower foundation 10, an upper foundation 9 that is paired therewith is constructed.

  After completion of the construction of the reinforcing block 12 on the lower structure 8 side and the reinforcing block 11 on the upper structure 7 side, the jack 5 is installed in the opening 4 as shown in FIG. The jack 5 is installed between the lower surface of the partition wall 2 on the upper structure 7 side facing the opening 4 and the upper surface of the partition wall 2 on the lower structure 8 side. At this time, as shown in FIG. 7- (a), when the width of the seismic isolation device 6 is larger than the width of the pillar 1, the pillar 1 on the upper structure 7 side and the pillar 1 on the lower structure 8 side are separated. In order to prevent the seismic isolation device 6 from contacting (crashing) the jack 5 when the seismic isolation device 6 is inserted between the jacks 5, the jack 5 is disposed on the side far from the column 1 (opposite side of the column 1). A state in which the jack 5 is installed in the opening 4 around the column 1 is shown in FIG.

  After the jack 5 is installed in the opening 4, the jack 5 is jacked up and the pillar 1 is divided, and the vertical load of the upper structure 7 borne by the pillar 1 is applied to a plurality of jacks 5 around the pillar 1. To share. Thereafter, as shown in FIG. 5- (b), the pillar 1 is cut and removed over a section corresponding to the height of the space required for installing the seismic isolation device 5 including the upper base 9 and the lower base 10 described above. Is done. By removing the pillar 1, the upper and lower partition walls 2 sandwiching the opening 4 are connected to the pillar 1 on the upper structure 7 side and the pillar 1 on the lower structure 8 side.

  After removing a part of the cut pillar 1, the lower base plate 14 for receiving the lower flange 62 of the seismic isolation device 6 is installed on the pillar 1 on the lower structure 8 side as shown in FIG. As shown in b), the lower base 10 for fixing the lower base plate 14 to the column 1 on the lower structure 8 side and the reinforcing block 12 is constructed or installed on the column 1 on the lower structure 8 side. Since the drawing shows an example in which the width of the seismic isolation device 6 is larger than the width of the column 1, the widths of the lower base plate 14 and the lower base 10 are as shown in FIGS. 5 (a) to 5 (c). However, the lower base plate 14 may be accommodated in the horizontal section of the pillar 1.

  The lower foundation 10 is constructed with a cast-in-place concrete structure, or is carried in and installed on the site in a state of being pre-fabricated with precast concrete or steel. The lower foundation 10 is fixed to the column 1 on the side of the lower structure 8 or to the column 1 and the reinforcing block 12 and integrated so as to transmit the horizontal load borne by the seismic isolation device 6 to the lower structure 8. . When the lower foundation 10 is constructed, the anchor 14a of the lower base plate 14 is embedded in the lower foundation 10 and fixed. The anchor 10a in the lower foundation 10 is embedded and fixed in the reinforcing block 12 or in the pillar 1 on the reinforcing block 12 and the lower structure 8 side.

  After fixing the lower foundation 10 to the lower structure 8, or after hardening the concrete of the lower foundation 10, as shown in FIG. 7- (a), between the lower surface of the pillar 1 on the upper structure 7 side on the lower foundation 10. And the lower flange 62 is joined to the lower base plate 14. The drawing shows a state in which the upper base plate 13 is joined in advance to the upper flange 61 of the seismic isolation device 6 in order to improve the efficiency of the installation work of the seismic isolation device 6 and omit the joining work in a narrow space. However, this is not always necessary.

  After the seismic isolation device 6 is installed between the separated upper and lower columns 1, 1, the upper base plate 13 is placed on the lower surface side of the column 1 on the upper structure 7 side on the upper base plate 13 as shown in FIG. The upper foundation 9 for fixing to the pillar 1 on the upper structure 7 side is constructed or installed. The upper foundation 9 is also constructed with a cast-in-place concrete structure, or is installed on the site after being carried in a state of being pre-fabricated with precast concrete or the like. In order to transmit the horizontal load from the upper structure 7 to the seismic isolation device 6, the upper foundation 9 is also fixed and integrated with the pillar 1 on the upper structure 7 side or the pillar 1 and the reinforcing block 11. When the upper foundation 9 is constructed, the anchor 13a of the upper base plate 13 is embedded in the upper foundation 9 and fixed. The anchor 9a in the upper foundation 9 is embedded and fixed in the reinforcing block 11 or in the column 1 on the reinforcing block 11 and the upper structure 7 side.

  After fixing the upper foundation 9 to the upper structure 7 or hardening the concrete, the jack 5 is jacked down as shown in FIG. 8A, and the vertical load of the upper structure 7 is borne by the seismic isolation device 6. Thereafter, as shown in FIG. 8- (b), slits 2a are formed in the partition wall 2 connected to the upper structure 7 and the lower structure 8 in the horizontal direction or the like over the entire length, so that the partition wall 2 is connected to the upper structure 7 side and the lower structure. Separate into 8 sides. As described above, since the partition wall 2 is separated from the column 1 when the column 1 is removed, the partition wall 2 is vertically separated from each other by the formation of the slit 2a, and is connected to the upper slab 71 and the lower slab 81, respectively. Separation of the upper structure 7 from the seismic isolation is completed by separating the partition wall 2 into the upper structure 7 side and the lower structure 8 side. Since the role of the jack 5 ends when the jack is down, the jack 5 can be recovered at the time of FIG.

  When the vertical load of the superstructure 7 can be borne by the partition wall 2 from the cutting of the pillar 1 shown in FIG. 5B to the installation of the seismic isolation device shown in FIG. The jack 5 is not required except when used preliminarily or auxiliaryly, but the rigidity around the column 1 on the upper structure 7 side and the column 1 on the lower structure 8 side after the seismic isolation device 6 is installed. In order to ensure the above, an operation of constructing the reinforcing blocks 11 and 12 on the upper structure 7 side and the lower structure 8 side is performed.

1 …… Column 1a …… Corner 1b …… Side Column 1c …… Medium Column
2 ... partition wall, 2a ... slit, 3 ... closed space, 4 ... opening,
5 ... Jack, 6 ... Seismic isolation device, 61 ... Upper flange, 62 ... Lower flange,
7 ... Superstructure, 71 ... Top slab, 8 ... Bottom structure, 81 ... Bottom slab,
9: Upper foundation, 9a: Anchor, 10: Lower foundation, 10a: Anchor,
11 ... Reinforcement block, 12 ... Reinforcement block,
13: Upper base plate, 13a: Anchor,
14 …… Lower base plate, 14a …… Anchor,
15 …… Auxiliary block.

Claims (5)

In any layer of the existing structure in which a closed space defined by a plurality of pillars arranged at intervals in two horizontal directions and a partition wall connected to an adjacent pillar is arranged in the two horizontal directions,
An opening is formed in any of the partition walls facing the outside of any one of the layers, and the partition wall that separates the closed space and the adjacent closed space from the closed space formed by the partition wall in which the opening is formed. After the operation of forming the opening is repeated and the entire closed space is communicated, the vertical load of the upper structure on any one of the layers borne by each pillar is temporarily supported by the partition wall or jack Then, a part of the pillar is cut and removed, and a seismic isolation device is installed in the removal section of the pillar.   2. The opening according to claim 1, wherein the openings are formed in at least two different partition walls facing the outside before the pillar is cut, and at least three openings facing each of the closed spaces are formed. Seismic isolation method for existing structures.   3. The method for seismic isolation structuring of an existing structure according to claim 1, wherein the opening is formed at a location close to the column of the partition wall.   The seismic isolation structuring method for an existing structure according to any one of claims 1 to 3, wherein a jack that temporarily supports a vertical load of the upper structure is installed in the opening. Between the partition walls adjacent in the circumferential direction of the column on the upper structure side separated above and below the opening, and between the partition walls adjacent in the circumferential direction of the column on the lower structure side separated from the upper structure. The seismic isolation structuring method for an existing structure according to any one of claims 1 to 4, wherein a reinforcing block is constructed or installed.

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