JP2015190120A - Aseismatic repair method of building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an aseismatic repair method capable of reducing a burden load on a skeleton column, a skeleton girder, and a building foundation to improve earthquake resistance of a building, thereby reducing the workload of the aseismatic repair.SOLUTION: In this aseismatic repair method, part or all of floor slabs 28 provided on an intermediate layer part 18 and upper layer part 20 of a building 10, which are located higher than a lower layer part 16, are removed while a roof floor 22 and outer walls of the building 10 are left behind, so that the weight of the building 10 is reduced to decrease a seismic force applied on the building 10.

Description

  The present invention relates to a seismic retrofit method for a building that improves the seismic resistance of the building.

  As a seismic retrofit method for improving the earthquake resistance of a building, a method of adding a seismic element such as a brace or a seismic wall to a building frame is widespread. For example, Patent Document 1 discloses an earthquake-proof reinforcement method for an existing building in which an iron plate is wound around the outer periphery of a column constituting a column beam frame, and the brace is added to the column beam frame by joining the end of the iron plate and the brace. It is disclosed.

  On the other hand, there is a seismic retrofitting method that improves the earthquake resistance of buildings by dismantling the upper floors of the building and leaving only the lower floors usable, without adding seismic elements to the building frame, and reducing the weight of the building. is there.

  However, with this seismic retrofit method, after dismantling the upper floors of the building, the lower floors can be used so that waterproofing work is performed on the upper floors of the lower floors, and new construction or replacement of elevators, air conditioning, etc. You have to do construction. In other words, it takes a lot of time for seismic retrofit.

JP 2000-154651 A

  This invention considers the fact concerned, and makes it a subject to reduce the effort of earthquake-proof repair.

  The invention of the first aspect is a building that reduces the weight of the building by removing part or all of the floor slab provided on the floor above the lower layer of the building, leaving the roof floor and the outer wall of the building. It is a seismic retrofit method.

  In the invention of the first aspect, by removing the floor slab and reducing the weight of the building, the earthquake resistance of the building can be improved by a simple method. That is, it is possible to reduce the trouble of earthquake-proofing the building.

  In addition, it is not necessary to perform waterproofing work, new construction work such as elevator equipment, air conditioning equipment, or replacement work required for a seismic retrofit method that reduces the weight of the building by dismantling the entire upper part of the building. In addition, this makes it possible to perform building renovation work while using the lower layer of the building.

  The invention of the second aspect is the method for seismic retrofit of a building of the first aspect, wherein the floor slab is removed leaving the core of the building.

  In the invention of the second aspect, there is no need to perform new installation work or replacement work such as elevators, stairs and other vertical flow line equipment, equipment piping, equipment wiring, etc., which are arranged in the core of the building.

  The invention of the third aspect is the earthquake-resistant repair method for buildings of the first or second aspect, wherein the floor slab is removed in a zigzag pattern.

  In the invention of the third aspect, the rigid floor assumption of the floor from which the floor slab has been removed can be established without performing reinforcement or without performing complicated reinforcement.

  Since this invention was set as the said structure, the effort of earthquake-proof repair can be reduced.

It is an elevation view which shows the earthquake-proof repaired building which concerns on embodiment of this invention. It is a top view which shows the floor of the building before earthquake-proof repair which concerns on embodiment of this invention. It is a top view which shows the floor of the building by which the earthquake-proof repair which concerns on embodiment of this invention was carried out. It is a top view which shows the variation of the floor of the building by which the earthquake-proof repair which concerns on embodiment of this invention was carried out. It is a top view which shows the variation of the floor of the building by which the earthquake-proof repair which concerns on embodiment of this invention was carried out.

  Embodiments of the present invention will be described with reference to the drawings. First, the earthquake-proof repair method of the building which concerns on embodiment of this invention is demonstrated.

  The elevation view of FIG. 1 shows a building 10 that has been earthquake-proofed by the earthquake-proofing method for buildings of this embodiment. The building 10 is a steel-framed reinforced concrete structure built on the ground 12. The underground layer 14 from the first basement to the second basement, the lower layer 16 from the first floor to the third floor, the fourth floor To the upper six floors, and the upper layer 20 from the seventh floor to the rooftop floor 22 is configured. The rooftop floor 22 is provided with towers 24 and 26 having elevator machine rooms.

  In the seismic retrofit method for a building according to the present embodiment, the rooftop floor 22, the towers 24 and 26, the outer wall 48, the main beam 54a, the small beam 54b, and the main column 56 (see FIG. 2) of the building 10 are left, A part of the floor slabs 28 provided on the floor above the lower layer 16 of the building 10 (in the example of this embodiment, the floor from the fourth floor to the eighth floor) is removed, and the weight of the building 10 is reduced. To reduce.

  The plan view of FIG. 2 shows the plan configuration before the earthquake-resistant repair of the floors 30, 32, 34, 36, 38 from the fourth floor to the eighth floor (floors 30, 32, 34, 36, 38). 3 is a plan view of the floors 30, 32, 34, 36, and 38 after the seismic retrofitting (the floors 30, 32, 34, 36, and 38). The plane configuration is the same). On the floors 30, 32, 34, 36, 38, stairs 40, 42 and elevators 44, 46 are provided.

  The floors 30, 32, 34, 36, and 38 are all the floor slabs 28 other than the core parts 50 and 52, which are arranged before the earthquake-resistant repair shown in FIG. 2. By removing all the large frame beams 54a and all the small beams 54b, the planar configuration shown in FIG. 3 is obtained. Here, a core part means the division part by which vertical flow line equipment, such as an elevator and stairs, equipment piping, equipment wiring, etc. are arranged in the floor of a building. If the rigid floor assumption of the floors 30, 32, 34, 36, and 38 is established, some of the large frame beams 54a and small beams 54b may be removed to further reduce the weight of the building 10.

  The floor of the lower layer part 16 of the building 10 is used after earthquake-proof repair (functions as a residential floor), and the floor above the lower layer part 16 is not used (does not function as a residential floor).

  Next, the operation and effect of the earthquake-proof repair method for buildings according to the embodiment of the present invention will be described.

  In the seismic retrofit method for a building of this embodiment, as shown in FIGS. 1 and 3, the seismic force generated in the building 10 can be reduced by removing the floor slab 28 and reducing the weight of the building 10. Moreover, the burden load of the frame pillar 56, the frame main beam 54a, and a building foundation can be reduced. Thus, the earthquake resistance of the building 10 can be improved by a simple method. That is, it is possible to reduce the trouble of earthquake-proof repair of the building 10.

  In addition, it is not necessary to perform new construction work or refilling work such as elevators 44, 46, vertical flow line equipment such as elevators 44, 46, stairs 40, 42, equipment piping, equipment wiring, etc., which are arranged in the core portions 50, 52 of the building 10. Therefore, the earthquake resistance of the building 10 can be improved at a low cost.

  Furthermore, the earthquake-resistant repair work is performed only in the area other than the core portions 50 and 52 of the floor of the middle layer portion 18 and the upper layer portion 20, and even during the earthquake-proof repair work, the rooftop floor 22 exhibits a waterproof function, and the core portion 50 , 52, the elevator 44, 46, the staircases 40, 42, and the like such as vertical flow line equipment, equipment piping, equipment wiring, etc. can be used. Renovation work can be performed.

  Further, in the building earthquake-resistant repair method of this embodiment, the floor slab 28 is removed while leaving the outer wall 48 of the building 10, so that the earthquake-proof repair work can be performed safely and the appearance of the building 10 is not changed. You can leave the building image from before.

  The embodiment of the present invention has been described above.

  In addition, in this embodiment, although the example which removes some floor slabs 28 provided in the floor above the lower layer part 16 of the building 10 and reduces the weight of the building 10 was shown, floor slab 28 is shown. If the Is value of the structural seismic index can be increased by removing (for example, the Is value is 0.6 or more), a plurality of floor slabs 28 provided on the floor above the lower layer 16 of the building 10 are provided. May be removed, or any of a plurality of floor slabs 28 provided on the floor above the lower layer 16 of the building 10 may be removed. For example, when there is no need to leave the vertical flow line equipment such as elevators 44 and 46, stairs 40 and 42, equipment piping, equipment wiring, etc., the floor slab 28 provided in the core portions 50 and 52 is removed. Also good.

  Moreover, in this embodiment, although the example which removed the floor slab 28 leaving all the frame large beams 54a and all the small beams 54b was shown, the rigid floor assumption of the floor which removed the floor slab 28 is materialized, and the building 10 is shown. As long as the outer wall 48 can be retained and left, some of the large beam 54a and the small beam 54b may be removed.

  Furthermore, in this embodiment, although the lower layer part 16 was shown as the part from the 1st floor of the building 10 to the 3rd floor of the ground, the lower layer part 16 is from the lowest hierarchy of the building 10 to a predetermined ground level. It is good also as a hierarchical part which does not remove the floor slab 28. FIG. That is, you may make it improve the earthquake resistance of this building by removing the one part or all part of the floor slab provided in the floor above a predetermined ground level, and reducing the weight of a building.

  Moreover, in this embodiment, as shown in FIG. 3, all the floor slabs 28 other than the core portions 50 and 52 are removed from among the plurality of floor slabs 28 arranged before the earthquake-proof repair. As shown in the plan views of FIGS. 4 (a), 4 (b) and 5 (a), 5 (b), one of the floor slabs 28 that had been placed before the earthquake-resistant repair was shown. Part may be removed.

  4A, 4B, 5A, and 5B show examples in which the floor slab 28 is removed in a staggered arrangement. In this way, the rigid floor assumption of the floor of the floor from which the floor slab 28 has been removed can be established without performing reinforcement or complicated reinforcement. If the rigid floor assumption is not established by removing the floor slab 28, the frame large beam 54a and the small beam 54b may be reinforced.

  Furthermore, the floor slab 28 is located on the floor above the lower layer 16 of the building 10 and is located directly above or directly below the opening 58 formed on the floor, and is provided on the upper and lower floors of this floor. The floor slab 28 may be left (not removed).

  For example, the plan configuration of the upper floor and the lower floor of the floor shown in FIG. 4A is as shown in FIG. Further, for example, the plan configuration of the upper floor and the lower floor of the floor shown in FIG. 5A is as shown in FIG.

  In this way, the force transmission path to the load-bearing wall or the like that is damaged by removing the floor slab 28 is caused by the floor slab 28 positioned directly above or below the opening surface 58 formed by removing the floor slab 28. Can be supplemented.

  Moreover, in this embodiment, the floor of the lower layer part 16 of the building 10 is used after seismic retrofit (functions as a residential floor), and the floor above the lower layer part 16 is not used (does not function as a residential floor). Although shown, you may make it use the floor above the lower layer part 16 (it is made to function as a residence floor). In this case, for example, a space formed across the upper and lower layers through the opening surface 58 by removing the floor slab 28 may be defined as a blow-off space.

  Furthermore, you may use the floor slab 28 removed in this embodiment for reinforcement of the lower layer part 16 of the building 10. FIG. For example, the removed floor slab 28 may be used as a reinforcing material for the load-bearing wall or the frame column 56.

  Moreover, although the example which applied the earthquake-proof repair method of the building of this embodiment to the building 10 which has an underground floor was shown, you may apply the earthquake-proof repair method of the building of this embodiment to the building which has only a ground floor. .

  Furthermore, in the present embodiment, an example in which the building 10 is a steel reinforced concrete building has been shown. Structure), a mixed structure thereof, and the like may be buildings of various structures and scales.

  In addition, as described so far, the earthquake-resistant repair method of the building according to the present embodiment can improve the earthquake resistance of the building 10 by a simple method. For example, the rebuilding of the building is planned in the future. However, for the time being, if you want to secure earthquake resistance that meets the current earthquake resistance standards with a simple and low-cost method, perform part of the dismantling work of the building 10 in the future. Is effective.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to such embodiment at all, Of course, in the range which does not deviate from the summary of this invention, it can implement in a various aspect.

10 Building 16 Lower part 28 Floor slab 50, 52 Core part

Claims (3)

  A method of seismic renovation of a building that removes part or all of a floor slab provided on a floor above the lower layer of the building, leaving a rooftop floor and an outer wall of the building, thereby reducing the weight of the building.   The method for seismic retrofit of a building according to claim 1, wherein the floor slab is removed leaving the core of the building.   The method of retrofitting a building according to claim 1 or 2, wherein the floor slab is removed in a staggered pattern.

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