JP4228308B2 - Reinforcement method for existing floors and seismic isolation method for existing buildings - Google Patents

Reinforcement method for existing floors and seismic isolation method for existing buildings Download PDF

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JP4228308B2
JP4228308B2 JP2004179526A JP2004179526A JP4228308B2 JP 4228308 B2 JP4228308 B2 JP 4228308B2 JP 2004179526 A JP2004179526 A JP 2004179526A JP 2004179526 A JP2004179526 A JP 2004179526A JP 4228308 B2 JP4228308 B2 JP 4228308B2
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existing
floor
seismic isolation
reinforcing
foundation
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JP2006002428A (en
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泰造 川端
義人 本多
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清水建設株式会社
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  The present invention is directed to an existing building in which the floor of the lowermost floor is formed of soil-concrete, a reinforcement method for reinforcing the existing floor of soil-concrete in the existing building, and the entire existing building as a seismic isolation building It relates to the seismic isolation method for repair.
As a construction method for reinforcing an old building and making it seismic isolation, for example, one disclosed in Patent Document 1 has been proposed. This is intended for historical buildings such as masonry such as bricks and stones, and the main purpose is to reinforce the foundation by adding concrete around the existing foundation and integrating it with a tension material. The existing building is seismically isolated by supporting the reinforced foundation with a seismic isolation device such as laminated rubber.
JP-A-11-148231
  By the way, in the building constructed in the past, the floor of the lowest floor (grounding floor) is often formed not by structural slab but by simple soil concrete. In such cases, the strength of such concrete is often a problem. In such cases, it is necessary to dismantle the concrete and construct a new structural slab to ensure horizontal rigidity on the floor. Conventionally common.
  On the other hand, when reinforcing or refurbishing an existing building, there are many requests to perform the construction while using the building as it is, but dismantling the existing soil concrete and constructing a new structural slab as described above Of course, construction using the building was impossible, and such a request could not be met.
  In view of the above circumstances, the present invention is an effective and effective reinforcement method that can reinforce the soil concrete as an existing floor even while using an existing building, and an effective seismic isolation even while using the existing building. The purpose is to provide an appropriate seismic isolation method.
The invention of claim 1 is a reinforcing method for reinforcing an existing floor formed of soil concrete on the lowest floor of an existing building, excavating a support ground of the soil concrete that is the existing floor into a groove shape, While supporting the existing floor via joists using the pillars installed in the excavation groove, the excavation groove is expanded to the surroundings, and the work space is secured below the existing floor by expanding the pillars around it. A reinforcing foundation is integrally provided around the existing foundation by the work inside, and a structural slab as a reinforcing structure supporting the existing floor is supported on the lower surface side of the existing floor by the reinforcing foundation and formed between the reinforcing foundations. Then, the joist supporting the existing floor is buried and left in the structural slab .
A second aspect of the present invention, a seismic sinkers method for lowest floor of the bed to repair the seismic isolation building as for existing buildings that are formed by the earth floor concrete, earth floor by the reinforcing method according to claim 1, wherein Reinforce the existing concrete floor and secure horizontal rigidity at the lowest floor by the structural slab as a reinforcing structure, and further excavate the existing foundation and the reinforcement foundation below by working in the work space, and seismic isolation device there The seismic isolation device supports the entire existing building and the work space remains as a seismic isolation pit.
According to the reinforcement method of the existing floor of the present invention, excavating the supporting ground of soil concrete as the existing floor to secure a work space below it, and supporting the existing floor from the lower surface side by work in the work space Since the structural slab is constructed as a reinforced structure, the existing floor can be effectively reinforced and left without being dismantled, and such construction can be carried out while using the existing building. . At that time, since the existing foundation is reinforced by the work in the work space, the foundation can be reinforced while using the building.
Also, by adopting a structural slab as the reinforcing structure that supports the soil concrete and forming it on the lower surface side of the soil concrete, the structural slab supports the soil concrete through the joists and has an excellent reinforcing effect. In addition, the joist is buried in the structural slab as it is and left, so it is excellent in workability .
According to seismic sinker method of the present invention, the horizontal at the lowest floor to reinforce the existing floor and existing foundation by working in the work space provided below the existing floor while using existing buildings by the reinforcing method of the By installing seismic isolation devices and supporting the entire building with seismic isolation by working in the work space, it is possible to make it seismically isolated while using an existing building. It is reasonable because it can be left and used as a seismic isolation pit.
  One embodiment of the reinforcing method of the present invention is shown in FIGS. Fig. 1 shows the lowest floor (the first floor above ground) of an old brick building to be reinforced, and the existing foundation 1 of this existing building is a structure in which bricks are stacked on unreinforced concrete 2 The existing floor 3 on the lowest floor is formed directly on the supporting ground 4 as soil concrete. In this embodiment, the following construction method is adopted to reinforce the existing foundation 1 and the existing floor 3 while using this existing building.
  First, as shown in FIG. 2, an excavation groove 5 is formed by excavating the periphery of the existing foundation 1 into a groove shape from an opening (not shown) provided at an appropriate position. At this time, since the support force for the existing floor 3 (concrete concrete) is lost in the portion due to the formation of the excavation groove 5, the groove width of the excavation groove 5 is limited to the extent that the existing floor 3 is not adversely affected and exceeds that In this case, the support 6 is provided and the existing floor 3 is supported by the support 6 via the joist 7.
  As shown in FIG. 3, the supporting ground 4 is excavated by gradually expanding the excavation groove 5 around the support floor 4 while supporting the existing floor 3 by installing such columns 6 at a predetermined pitch. A work space 8 is secured below the entire floor 3, and thereafter, the existing foundation 1 and the existing floor 3 are reinforced by work in the work space 8.
  That is, as shown in FIG. 4, reinforced concrete reinforcement foundations 9 are provided on both sides of the existing foundation 1, tension members 10 are provided so as to penetrate the reinforcement foundation 9 and the existing foundation 1, and the tension members 10 are tensioned. The existing foundation 1 is reinforced by tightening and integrating the reinforcing foundation 9 with the existing foundation 1. As such a reinforcing method for the existing foundation 1, the method described in Patent Document 1 described above can be suitably employed.
  Then, similarly as shown in FIG. 4, the structural slab 11 made of reinforced concrete is integrally provided on the upper portion of the reinforcing foundation 9, so that the structural slab 11 is formed on the lower surface side of the existing floor 3. The structural slab 11 is supported by the reinforcing foundation 9 and is provided between the reinforcing foundations 9 to function as a reinforcing structure for supporting the existing floor 3, and at the same time, the horizontal rigidity at the first floor level of the existing building is increased. The strength and the plate thickness may be designed so that such functions can be exhibited. In the construction of the structural slab 11, the joist 7 is buried in the structural slab 11 as it is and fixed to the structural slab 11, so that the newly constructed structural slab 11 does not adhere to the lower surface of the existing floor 3. The existing floor 3 can be reliably supported through the joists 7. The support column 6 may be left as it is as a part of the reinforcing structure, but it may be removed later in the case of seismic isolation as will be described later.
  According to the above-described reinforcement method, it is possible to excavate the supporting ground 4 of the soil concrete as the existing floor 3 to secure the work space 8 there, and to reinforce the existing floor 3 only by the work from there. Therefore, it is possible to leave the existing floor 3 as soil concrete without dismantling it as before, so that it is possible to carry out the reinforcement work without any trouble even while using the existing building. It is possible to reduce the construction period and cost.
The embodiment of the reinforcing method of the present invention has been described above. Next, the embodiment of the seismic isolation method of the present invention will be described with reference to FIG . The seismic isolation method according to the present embodiment is relieved by the work in the work space 8 after reinforcing the existing foundation 1 and the existing floor 3 as shown in FIGS . The seismic device 17 is installed to make the existing building seismic isolation.
That is, from the state shown in FIG. 4 , the work space 8 is further excavated as shown in FIG. 5 , and the reinforcement foundation 15 is newly installed and integrated at the bottom of the existing foundation 1 and the reinforcement foundation 9 provided on both sides thereof. . A base bottom 16 is newly installed at the bottom of the work space 8, and a seismic isolation device 17 such as laminated rubber is installed between the base bottom 16 and the reinforcing base 15. Construction of reinforced foundation 15 and underlying bottom plate 16, the installation of the seismic isolation device 17, can be suitably employed method disclosed in Patent Document 1 described above.
  According to such a seismic isolation method, the existing floor 3 and the existing foundation 1 are reinforced only by the work in the work space 8, and the seismic isolation device 17 is sequentially installed at the lower part of each foundation after the reinforcement. By doing so, it is possible to make seismic isolation while using existing buildings. The work space 8 secured for the work may be left as it is as an installation space for the seismic isolation device 17 and as a seismic isolation pit as a maintenance and inspection space, which is extremely rational and effective.
  Of course, the present invention is not limited to the above embodiments, and various modifications and applications can be made without departing from the scope of the present invention.
For example, each of the above embodiments is directed to an old brick building, but it goes without saying that the present invention is not limited to brick building but can be applied to existing buildings having various structures .
The embodiment of the reinforcement construction method of the present invention is shown, and it is a figure showing soil concrete which is an existing foundation and an existing floor to be reinforced. It is a figure which shows the state which excavated a part of support ground of soil concrete in the shape of a groove | channel similarly. It is a figure which shows the state which secured the work space similarly. It is a figure which shows the state which installed the structural slab as a reinforcement structure same as the above. An embodiment of the seismic isolation method of the present invention is shown. It is a figure which shows the state which installed the seismic isolation apparatus, after reinforcing the existing foundation.
Explanation of symbols
1 Existing foundation 2 Unreinforced concrete 3 Existing floor (concrete concrete)
4 Support ground 5 Excavation groove 6 Strut 7 Jota 8 Work space (Seismic isolation pit)
9 Reinforcement foundation 10 Tensile material 11 Structural slab (reinforcement structure)
15 Reinforcement foundation 16 Foundation bottom 17 Seismic isolation device

Claims (2)

  1. Reinforcement method to reinforce the existing floor formed of soil concrete on the lowest floor of an existing building,
    Excavated concrete support ground, which is an existing floor, is excavated into a groove shape, and the excavation groove is expanded to the surroundings while supporting the existing floor via joists using the struts installed in the excavated grooves, and pillars are added to the surroundings. ensuring the working space below the existing floor I, provided with integrally reinforcing foundation around the existing foundation by working within the working space, as a reinforcing structure for supporting the lower surface side of the existing floor A structural slab is supported by the reinforcing foundation, formed between the reinforcing foundations, and the joist supporting the existing floor is buried and left in the structural slab .
  2. It is a seismic isolation method for renovating an existing building whose bottom floor is made of soil concrete to a seismic isolation building,
    The existing floor of the soil concrete is reinforced by the reinforcing method according to claim 1 , and the horizontal rigidity at the lowermost floor is secured by the structural slab as the reinforcing structure, and the lower part of the existing foundation and the reinforcing foundation is lowered by the work in the work space. A seismic isolation method for existing buildings, characterized by further excavating and installing seismic isolation devices there, supporting the entire existing building with seismic isolation devices and leaving the work space as seismic isolation pits.
JP2004179526A 2004-06-17 2004-06-17 Reinforcement method for existing floors and seismic isolation method for existing buildings Expired - Fee Related JP4228308B2 (en)

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JP4228308B2 true JP4228308B2 (en) 2009-02-25

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102704705A (en) * 2012-06-06 2012-10-03 河北省建筑科学研究院 Building long-stroke redescending-free multi-point synchronous jacking method

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4786973B2 (en) * 2005-09-01 2011-10-05 株式会社竹中工務店 Construction method to renovate the floor part around the column base of the existing structure
JP2008156930A (en) * 2006-12-25 2008-07-10 Takenaka Komuten Co Ltd Base-isolating and repairing method for existing building having earthen floor
JP2009155794A (en) * 2007-12-25 2009-07-16 Shimizu Corp Base isolation construction method
CN103741963B (en) * 2014-01-06 2015-09-09 北京筑福国际工程技术有限责任公司 A kind of workshop foundation reinforcement means
JP6326279B2 (en) * 2014-04-30 2018-05-16 大成建設株式会社 Seismic isolation repair method for pile foundation structures

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102704705A (en) * 2012-06-06 2012-10-03 河北省建筑科学研究院 Building long-stroke redescending-free multi-point synchronous jacking method
CN102704705B (en) * 2012-06-06 2014-08-06 河北省建筑科学研究院 Building long-stroke redescending-free multi-point synchronous jacking method

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