JP6130991B2 - Foundation structure - Google Patents

Foundation structure Download PDF

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JP6130991B2
JP6130991B2 JP2011240420A JP2011240420A JP6130991B2 JP 6130991 B2 JP6130991 B2 JP 6130991B2 JP 2011240420 A JP2011240420 A JP 2011240420A JP 2011240420 A JP2011240420 A JP 2011240420A JP 6130991 B2 JP6130991 B2 JP 6130991B2
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pile
existing
new
foundation slab
foundation
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JP2013096153A (en
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健史 藤森
健史 藤森
理智 勝二
理智 勝二
山本 彰
山本  彰
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株式会社大林組
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Description

  The present invention relates to a foundation structure constructed using an existing pile supporting a removed building.
  As the foundation structure built using the existing pile that supported the removed building, for example, in the existing pile, the foundation (foundation slab) is in a semi-bonded state in which the joint is reduced by reducing the moment. The foundation (foundation slab) is rigidly or semi-rigidly joined to the new pile, and the load of the vertical force received from the foundation (foundation slab) and the horizontal force during an earthquake is smaller in the existing pile than in the new pile. The basic structure is known.
JP 2003-82688 A
  In the above foundation structure, the existing pile is semi-rigidly bonded to the foundation (foundation slab), so the performance of the existing pile is weakened, so the performance of the existing pile may not be fully utilized. Moreover, if both the existing pile and the new pile are semi-rigidly joined to the foundation (foundation slab), there is a problem that the design becomes complicated.
  This invention is made | formed in view of this subject, The place made into the objective is to provide the foundation structure which can fully utilize the performance of the existing pile.
  In order to achieve such an object, the foundation structure of the present invention includes an existing pile supporting the removed building, a newly installed pile, a foundation slab supported by the existing pile and the newly installed pile, The pile head fixing degree of the new pile with respect to the foundation slab is lower than the pile head fixing degree of the existing pile with respect to the foundation slab.
  According to such a foundation structure, the pile head fixing degree to the foundation slab of the new pile supporting the foundation slab is lower than the pile head fixing degree of the existing pile to the foundation slab. The stress load on the existing pile is greater than that on the new pile. That is, since the bending moment and the horizontal shearing force are more borne by the existing pile, the performance of the existing pile can be fully utilized.
  In such a foundation structure, the pile head of the new pile and the pile head of the existing pile are embedded in the foundation slab, and the pile head of the new pile embedded in the foundation slab The outer diameter is preferably smaller than the outer diameter of the pile head of the existing pile embedded in the foundation slab.
  According to such a foundation structure, since the outer diameter of the new pile buried in the foundation slab is smaller than the outer diameter of the existing pile, the rigidity of the joint between the foundation slab and the new pile is less than that of the joint of the existing pile. Lower than stiffness. For this reason, the new piles are less resistant to bending and horizontal shearing forces than the existing piles, and the bending and horizontal shearing forces imposed on the new piles are reduced, so the performance of the existing piles can be fully utilized. It is. In addition, by making the outer diameter of the new pile buried in the foundation slab smaller than the outer diameter of the existing pile, the pile head fixing degree of the new pile to the foundation slab can be easily fixed to the pile head of the existing pile. It is possible to realize a lower foundation structure.
  In such a foundation structure, the pile head of the new pile and the pile head of the existing pile are embedded in the foundation slab, and the pile head of the new pile embedded in the foundation slab The embedding depth may be shallower than the embedding depth of the pile head of the existing pile embedded in the foundation slab.
  According to such a foundation structure, the embedding depth of the new pile embedded in the foundation slab is shallower than the embedding depth of the existing pile, so that the joint strength between the foundation slab and the new pile is less than that of the existing foundation slab. It becomes lower than the joint strength of the joint with the pile. For this reason, the new piles are less resistant to bending and horizontal shearing forces than the existing piles, and the bending and horizontal shearing forces imposed on the new piles are reduced, so the performance of the existing piles can be fully utilized. It is. In addition, by fixing the pile head embedding depth of the new pile embedded in the foundation slab to be less than that of the existing pile head, the pile head fixing degree of the new pile to the foundation slab can be easily increased. It is possible to realize a foundation structure lower than the pile head fixing degree of existing piles against.
  In such a foundation structure, a reinforcing bar extending between the existing pile and the foundation slab is embedded between the existing pile and the foundation slab, and between the new pile and the foundation slab, Reinforcing bars may be buried shallower than the reinforcing bars between the new pile and the foundation slab, or reinforcing bars extending between the new pile and the foundation slab may not be buried.
  According to such a foundation structure, the joint strength of the foundation slab and the existing pile that have been joined to the reinforcing bars for a longer time is higher than the joint strength of the joint between the foundation slab and the new pile. For this reason, the new piles are less resistant to bending and horizontal shearing forces than the existing piles, and the bending and horizontal shearing forces imposed on the new piles are reduced, so the performance of the existing piles can be fully utilized. It is. In addition, between the existing pile and the foundation slab, a reinforcing bar covering the existing pile and the foundation slab is buried, and between the new pile and the foundation slab, the reinforcing bar extending between the new pile and the foundation slab is replaced with the existing pile and the foundation slab. By embedding shallower than the reinforcing bar that extends over the slab, or by not embeding the reinforcing bar that extends between the new pile and the foundation slab, the pile head fixing degree of the new pile relative to the foundation slab can be easily increased. It is possible to realize a foundation structure lower than the degree of head fixation.
  In this foundation structure, a ground improvement body is provided under the foundation slab, the pile head of the existing pile is embedded in the foundation slab, and the pile head of the new pile is It is good also as being embedded in the ground improvement body.
  According to such a foundation structure, the new pile is joined to the foundation slab via the ground improvement body, so the strength of the joint between the foundation slab and the new pile is the joint of the existing pile directly connected to the foundation slab. Lower than the strength of. For this reason, the new piles are less resistant to bending and horizontal shearing forces than the existing piles, and the bending and horizontal shearing forces imposed on the new piles are reduced, so the performance of the existing piles can be fully utilized. It is. In addition, by installing a ground improvement body under the foundation slab, burying the pile head of the existing pile in the foundation slab, and embedding the pile head of the new pile in the ground improvement body, it is easy to It is possible to realize a foundation structure whose pile head fixing degree is lower than the pile head fixing degree of the existing pile with respect to the foundation slab.
  In this foundation structure, it is desirable that the pile head fixing degree can be changed depending on the strength, thickness, and range of the ground improvement body.
  According to such a foundation structure, by changing the strength, thickness, and range of the ground improvement body in which the pile head of the new pile is embedded, a ground improvement body with desired rigidity is formed. Therefore, it is possible to increase the degree of freedom when setting the balance between the pile head fixing degree of the existing pile with respect to the foundation slab and the pile head fixing degree of the new pile with respect to the foundation slab.
  In such a basic structure, it is desirable that a tensile reinforcing material is mixed in the ground improvement body.
  According to such a foundation structure, since the tensile reinforcement is mixed in the ground improvement body, it is possible to prevent the ground improvement body from cracking, and the reliability of the pile head fixing degree of the new pile to the foundation slab is improved. It is possible to improve.
  In this foundation structure, it is preferable that a plurality of the existing piles and the new piles are provided, and a total cross-sectional area of the plurality of new piles is smaller than a total cross-sectional area of the plurality of existing piles.
  According to such a foundation structure, the total cross-sectional area of a plurality of newly installed piles is smaller than the total cross-sectional area of a plurality of existing piles. Therefore, as a whole, the joint strength of the joint between the foundation slab and the existing piles Is higher than the joint strength of the joint between the foundation slab and the new pile. For this reason, the new piles are less resistant to bending and horizontal shearing forces than the existing piles, and the bending and horizontal shearing forces imposed on the new piles are reduced, so the performance of the existing piles can be fully utilized. It is. In addition, by reducing the total cross-sectional area of the newly installed piles, the bending and horizontal shearing forces imposed on the multiple newly built piles can be reduced, making it easier to construct new foundation slabs. It is possible to realize a foundation structure in which the pile head fixing degree of the pile is lower than the pile head fixing degree of the existing pile with respect to the foundation slab.
  ADVANTAGE OF THE INVENTION According to this invention, it is possible to provide the foundation structure which can fully utilize the performance of the existing pile.
It is the schematic for demonstrating 1st Embodiment of the basic structure which concerns on this invention. It is sectional drawing which shows the junction part of the newly installed pile and foundation slab used for the foundation structure of 1st Embodiment which concerns on this invention. It is the schematic for demonstrating 2nd Embodiment of the foundation structure based on this invention. It is the schematic for demonstrating 3rd Embodiment of the foundation structure based on this invention. It is the schematic for demonstrating 4th Embodiment of the foundation structure which concerns on this invention. It is the schematic for demonstrating the modification of 4th Embodiment.
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In the following explanation, an existing pile is a pile that supported the existing building, and refers to the pile that remains in the ground after removing the existing building that was built on the top of the pile, depending on the size of the building Although the number of piles is set and provided, in the following description, one of a plurality of existing piles will be described as an example. Moreover, also in the newly provided pile, it demonstrates taking the example of one of several new piles.
  FIG. 1 is a schematic view for explaining a first embodiment of a foundation structure according to the present invention. FIG. 2 is a cross-sectional view showing a joint portion between a new pile and a foundation slab used in the foundation structure of the first embodiment according to the present invention.
  In the foundation structure of the first embodiment, the pile head 10a of the existing pile 10 after removing the existing building is protruded above the ground 22 on which the foundation slab 20 of the newly built building is placed. The newly provided pile 12 is, for example, a steel pipe concrete pile having a circular cross-sectional shape, and an end serving as the pile head 12a has a smaller outer diameter than a portion 12b other than the pile head 12a. More specifically, for example, as shown in FIG. 2, the pile head fixing degree of the new pile 12 with respect to the foundation slab 20 is higher than the pile head fixing degree of the existing pile 10 at the upper end portion of the steel pipe concrete pile forming the new pile 12. A fixing strength reducing member 15 is provided so as to be small.
  As shown in FIG. 2, the fixed strength reducing member 15 is provided so as to be coaxial with a cylindrical pedestal portion 15a having an outer diameter smaller than the inner diameter of the steel pipe 16 forming the steel pipe concrete pile, and above the pedestal portion 15a. A cylindrical small-diameter portion 15b having an outer diameter smaller than that of the pedestal portion 15a, and a tapered portion that gradually decreases in outer diameter from the pedestal portion 15a toward the lower end of the small-diameter portion 15b between the pedestal portion 15a and the small-diameter portion 15b. 15c, and is a concrete member formed integrally with, for example, a factory.
  The steel pile concrete pile that is the new pile 12 is fixed to the gap formed in the upper end portion after the steel pipe 16 is driven into the ground, and then the concrete 17 is cast so that a gap is formed at the upper end in the steel pipe 16. The strength reducing member 15 is disposed so that the pedestal portion 15a faces down, and concrete 17 is cast around the strength reducing member 15. FIG. 2 shows a state in which the fixed strength reducing member 15 is disposed in the gap and the concrete 17 is placed.
  And the upper end of the small diameter part 15b of the fixed strength reduction member 15 which the new pile 12 has is located in the substantially same height as the upper end of the existing pile 10 which protrudes from the ground 22, and the taper part 15c is not exposed to the ground surface. Is located in the ground. The plurality of existing piles 10 and the plurality of newly installed piles 12 that support the foundation slab 20 of a new building (not shown) both project to the ground in the above-described state before the foundation slab 20 is constructed. Has been.
  After placing the formwork (not shown) for the foundation slab 20 so as to surround the pile heads 10a, 12a of these existing piles 10 and new piles 12, and placing the reinforcing bars (not shown) inside, the concrete 17 The foundation slab 20 is constructed by placing. At this time, the embedding depth H with respect to the foundation slab 20 of the existing pile 10 and the new pile 12 is configured to be deeper than half the thickness T of the foundation slab 20 to be formed.
  As shown in FIG. 1, the foundation slab 20 constructed in this way has an existing pile 10 and a pile head 12 a of a new pile 12 having an outer diameter smaller than that of the existing pile 10, which is almost half of the thickness T of the foundation slab 20. Have been buried.
  According to the foundation structure of the first embodiment, since the outer diameter d of the new pile 12 embedded in the foundation slab is smaller than the outer diameter D of the existing pile 10, the rigidity of the joint portion between the foundation slab 20 and the new pile 12 is determined. However, it becomes lower than the rigidity of the junction part of the existing pile 10. FIG. For this reason, the new pile 12 is less resistant to bending and horizontal shearing force than the existing pile 10, and the bending and horizontal shearing force imposed on the new pile 12 is reduced, so the performance of the existing pile 10 is fully utilized. Is possible. Moreover, by making the outer diameter d of the new pile 12 embedded in the foundation slab 20 smaller than the outer diameter D of the existing pile 10, the pile head fixing degree of the new pile 12 with respect to the foundation slab 20 can be easily increased. A foundation structure lower than the pile head fixing degree of the existing pile 10 with respect to 20 can be realized. At this time, when a PC pile is used as the new pile 12, a PC pile in which the outer diameter of the pile head 12a is smaller than other parts is previously formed in a factory or the like. Here, the joint between the existing pile 10 and the foundation slab 20 corresponds to a rigid joint, and the joint between the newly installed pile 12 and the foundation slab 20 has a pile head fixing strength in the manner of applying a moment to the joint. This is a joining method between rigid joining and pin joining, and corresponds to a semi-rigid joining in which two members are joined so as to be in a joined state in which a moment is reduced so that a moment is reduced at the joint.
  In 1st Embodiment, although the example which made the outer diameter d of the new pile 12 smaller than the outer diameter D of the existing pile 10 was demonstrated from the total cross-sectional area which is the sum total of the cross-sectional area of the existing pile 10 provided in multiple numbers, You may make it the total cross-sectional area which is the sum total of the cross-sectional area of the newly provided pile 12 provided in multiple numbers become smaller. In this case, the joints of the plurality of new piles 12 are less resistant to bending and horizontal shearing as a whole than the joints of the plurality of existing piles 10, and the bending and horizontal shearing that each new pile 12 bears. Since the force is reduced, the performance of each existing pile 10 can be fully utilized. At this time, the joint between the plurality of existing piles 10 and the foundation slab 20 corresponds to a rigid joint as a whole, and the joint between the plurality of new piles 12 and the foundation slab 20 corresponds to a semi-rigid joint as a whole.
FIG. 3 is a schematic view for explaining a second embodiment of the foundation structure according to the present invention.
Next, the basic structure of the second embodiment will be described. In the foundation structure of the second embodiment, the existing pile 10 and the joining of the existing pile 10 and the foundation slab 20 are the same as those of the first embodiment, and thus the description thereof is omitted.
  The new pile 30 of the second embodiment is a so-called steel pipe concrete pile, and the outer diameter d of the pile head 30a is the same as the outer diameter of the other portion 30b, but the embedding depth h embedded in the foundation slab 20 is However, it is shallower than the embedding depth H of the existing pile 10, for example, about half of the embedding depth H of the existing pile 10.
  According to the foundation structure of 2nd Embodiment, since the embedding depth h of the new pile 30 embed | buried in the foundation slab 20 is shallower than the embedding depth H of the existing pile 10, joining of the foundation slab 20 and the new pile 30 is carried out. The joint strength of the part becomes lower than the joint strength of the joint part of the existing pile 10. Therefore, the new pile 30 is less resistant to bending and horizontal shearing force than the existing pile 10, and the bending and horizontal shearing force imposed on the new pile 30 is reduced, so the performance of the existing pile 10 is fully utilized. Is possible. Further, by setting the embedding depth h of the pile head 30a of the new pile 30 embedded in the foundation slab 20 to be shallower than the embedding depth H of the pile head 10a of the existing pile 10, the new pile with respect to the foundation slab 20 can be easily obtained. It is possible to realize a foundation structure in which the pile head fixing degree of 12 is lower than the pile head fixing degree of the existing pile 10 with respect to the foundation slab 20. In this case, the joint between the existing pile 10 and the foundation slab 20 having a deep embedding depth corresponds to a rigid joint, and the joint between the new pile 12 and the foundation slab 20 having a shallow embedding depth corresponds to a semi-rigid joint.
FIG. 4 is a schematic view for explaining a third embodiment of the foundation structure according to the present invention.
The existing pile 11 and the new pile 32 of the third embodiment are both on-site PC piles. For this reason, when constructing the foundation slab 20, the existing pile 11 exposes the reinforcing bars 11b extending upward through the concrete at the upper end. At this time, the upper end portion 11c of the reinforcing bar 11b to be exposed is provided to the same height as the upper end bar 20a of the foundation slab 20 or a position higher than the upper end bar 20a. For this reason, when the foundation slab 20 is constructed, the reinforcing bars 11b are arranged in the same height as the upper pile 20a of the existing pile 11 and the foundation slab 20 or higher than the upper stripe 20a.
  On the other hand, the new pile 32 excavates a hole 24 having the same inner diameter as the outer diameter d of the new pile 32, and a reinforcing bar 32a is arranged in the excavated hole 24, and concrete is placed in the hole 24 where the reinforcing bar 32a is arranged. 17 is laid. At this time, the upper end of the reinforcing bar 32a is lower than the upper end 11c of the reinforcing bar 11b, or the reinforcing bar 32a is arranged without protruding above the new pile 32. Further, when the concrete 17 is placed on the new pile 32, the concrete 17 is placed in the formwork of the foundation slab 20 installed so as to be connected to the upper ends of the existing pile 11 and the new pile 32. The foundation slab 20 connected with the existing pile 11 and the newly installed pile 32 as shown in FIG. 4 is constructed.
  According to the foundation structure of the third embodiment, the joining strength of the foundation slab 20 that joins the reinforcing bar 11b and the existing pile 11 is higher than the joining strength of the joining portion of the foundation slab 20 and the new pile 32. Become. For this reason, the new pile 32 is less resistant to bending and horizontal shearing force than the existing pile 11, and the bending and horizontal shearing force imposed on the new pile 32 is reduced, so the performance of the existing pile 11 is fully utilized. Is possible. Further, a reinforcing bar 11b extending between the existing pile 11 and the foundation slab 20 is buried between the existing pile 11 and the foundation slab 20, and between the new pile 32 and the foundation slab 20, the new pile 32 and the foundation slab 20 The upper end portion of the reinforcing bar 32a is lower than the upper end portion 11c of the reinforcing bar 11b or the reinforcing bar bar (rebar) 32a is not embedded, so that the pile head fixing degree of the new pile 32 to the foundation slab 20 is easily It is possible to realize a foundation structure lower than the pile head fixing degree of the existing pile 11 with respect to the foundation slab 20. In this case, the connection between the existing pile 10 in which the reinforcing bars extended longer and the foundation slab 20 are equivalent to a rigid connection, and is the upper end of the reinforcing bar 32a lower than the upper end 11c of the reinforcing bar 11b? The joint between the new pile 12 and the foundation slab 20 in which the reinforcing bar 32a is not embedded corresponds to a semi-rigid joint.
  FIG. 5 is a schematic view for explaining a fourth embodiment of the foundation structure according to the present invention. FIG. 6 is a schematic diagram for explaining a modification of the fourth embodiment.
  In the foundation structure of the fourth embodiment, the existing pile 10 and the joining of the existing pile 10 and the foundation slab 20 are the same as those in the first and second embodiments, and thus the description thereof is omitted.
  The new pile 34 of the fourth embodiment is the same as the outer diameter d of the pile head 34 a and the outer diameter of the other portion 34 b, but the pile head 34 a of the new pile 34 is not embedded in the foundation slab 20. When constructing 20, the ground improvement body 26 provided under the foundation slab 20 is disposed. The ground improvement body 26 is, for example, a soil cement member that is cast so as to surround the periphery of the existing pile 10 and the new pile 34 in substantially the same thickness as the foundation slab 20. That is, the existing pile 10 penetrates the ground improvement body 26 and is embedded in the foundation slab 20 up to almost half of the thickness T of the foundation slab 20, and the new pile 34 does not reach the foundation slab 20, The improvement body 26 is embedded up to almost half the thickness V of the ground improvement body 26.
  According to the foundation structure of the fourth embodiment, since the new pile 34 is joined to the foundation slab 20 via the ground improvement body 26, the strength of the joint portion between the foundation slab 20 and the new pile 34 is the same as that of the foundation slab 20. It becomes lower than the intensity | strength of the junction part of the existing pile 10 connected directly. For this reason, the new pile 34 is less resistant to bending and horizontal shearing force than the existing pile 10, and the bending and horizontal shearing force imposed on the new pile 34 is reduced, so the performance of the existing pile 10 is fully utilized. Is possible. Further, by providing a ground improvement body 26 under the foundation slab 20, burying the pile head 10a of the existing pile 10 in the foundation slab 20, and burying the pile head 34a of the new pile 34 in the ground improvement body 26, It is possible to easily realize a foundation structure in which the pile head fixing degree of the new pile 34 with respect to the foundation slab 20 is lower than the pile head fixing degree of the existing pile 10 with respect to the foundation slab 20. In this case, the joint between the existing pile 10 and the foundation slab 20 joined without the ground improvement body 26 corresponds to a rigid joint, and the new pile 12 and the foundation slab joined through the ground improvement body 26. The joint with 20 corresponds to a semi-rigid joint.
  At this time, as shown in FIG. 6, by burying a tensile reinforcement 27 such as a fiber material in the ground improvement body 26, the ground improvement body 26 is prevented from cracking, and the ground improvement body 26 has a stable strength. Can be secured. And it is possible to improve the reliability of the pile head fixing degree of the new pile 34 with respect to the foundation slab 20.
  Further, the strength of the ground improvement body 26 can be adjusted by changing the strength of the ground improvement body 26, the thickness V (FIG. 5), the placement range W (FIG. 5), and the like. For example, since the strength of the ground improvement body 26 is lowered, the thickness V of the ground improvement body 26 is reduced, or the range W to be placed is narrowed, the pile head fixing degree of the new pile 34 is lowered. The pile 34 is further less resistant to bending and horizontal shearing force than the existing pile 10, and the bending and horizontal shearing force imposed on the new pile 34 is further reduced, so that the performance of the existing pile 10 can be fully utilized. Is possible. For this reason, it is possible to increase the degree of freedom when setting the balance between the pile head fixing degree of the existing pile 10 with respect to the foundation slab 20 and the pile head fixing degree of the new pile 34 with respect to the foundation slab 20.
  Moreover, the existing pile 10 does not necessarily have to penetrate the ground improvement body 26 and may be directly embedded in the foundation slab 20.
  The above embodiment is for facilitating the understanding of the present invention, and is not intended to limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and it is needless to say that the present invention includes equivalents thereof.
DESCRIPTION OF SYMBOLS 10 Existing pile 10a Pile head 11 of an existing pile 11 Existing pile 11b Reinforcing bar 11c Upper end part 12 of an existing pile New pile 12a Pile head 12b of a new pile Part 15 other than a pile head Fixed strength reduction member 15a Base part 15b Small diameter part 15c Taper Part 16 Steel pipe 17 Concrete 20 Foundation slab 20a Top slab of foundation slab 22 Ground 24 Hole 26 Ground improvement body 27 Tension reinforcement 30 New pile 30a Pile head 30b of pile newly installed 32 Pile 32 other than pile head Reinforcement rod 34 New pile 34a Pile head of the new pile 34b Portion other than the pile head D Outer diameter of existing pile W Range of ground improvement body d Outer diameter of pile head of new pile H Embedment depth of existing pile h Embedment depth of new pile T Foundation slab Thickness V Ground improvement body thickness

Claims (8)

  1. An existing pile that supported the removed building, and
    New piles to be newly established,
    A foundation slab supported by the existing pile and the new pile;
    Have
    The foundation structure characterized by the pile head fixing degree of the said new pile with respect to the said foundation slab being lower than the pile head fixing degree of the said existing pile with respect to the said foundation slab.
  2. The basic structure according to claim 1 ,
    The pile head of the new pile and the pile head of the existing pile are embedded in the foundation slab,
    An outer diameter of the pile head of the new pile embedded in the foundation slab is smaller than an outer diameter of the pile head of the existing pile embedded in the foundation slab.
  3. The basic structure according to claim 1 ,
    The pile head of the new pile and the pile head of the existing pile are embedded in the foundation slab,
    The embedded structure of the pile head of the new pile embedded in the foundation slab is shallower than the embedded depth of the pile head of the existing pile embedded in the foundation slab. .
  4. A basic structure according to any one of claims 1 to 3 ,
    Between the existing pile and the foundation slab, a reinforcing bar extending between the existing pile and the foundation slab is embedded,
    Between the new pile and the foundation slab, a reinforcing bar is buried between the new pile and the foundation slab shallower than the reinforcing bar, or a reinforcing bar between the new pile and the foundation slab is not buried. Basic structure characterized by that.
  5. The basic structure according to claim 1 ,
    A ground improvement body is provided under the foundation slab, the pile head of the existing pile is embedded in the foundation slab, and the pile head of the new pile is embedded in the ground improvement body. A basic structure characterized by
  6. The basic structure according to claim 5 ,
    The foundation structure characterized in that the pile head fixing degree can be changed according to the strength, thickness, and range of the ground improvement body.
  7. The basic structure according to claim 5 or claim 6 ,
    A foundation structure characterized in that a tensile reinforcement is mixed in the ground improvement body.
  8. The basic structure according to claim 1 ,
    A plurality of the existing piles and the new piles are provided,
    The foundation structure characterized by the total cross-sectional area of the said several newly installed pile being smaller than the total cross-sectional area of the said some existing pile.
JP2011240420A 2011-11-01 2011-11-01 Foundation structure Active JP6130991B2 (en)

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JP5955108B2 (en) * 2012-06-04 2016-07-20 大成建設株式会社 Pile reinforcement structure of existing building and its construction method

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JP3127275B2 (en) * 1993-01-13 2001-01-22 株式会社竹中工務店 Pile horizontal resistance increase method
JP3385876B2 (en) * 1996-05-08 2003-03-10 鹿島建設株式会社 Cast-in-place pile construction method just below the existing foundation
JP3656493B2 (en) * 2000-01-21 2005-06-08 清水建設株式会社 Pile foundation structure
JP2002256571A (en) * 2001-03-01 2002-09-11 Shimizu Corp Reconstructing method for building, using method for existing pile and building
JP2003027500A (en) * 2001-07-18 2003-01-29 Shimizu Corp Foundation structure
JP4683520B2 (en) * 2001-09-12 2011-05-18 大成建設株式会社 Foundation structure of new building using existing piles
JP2005273296A (en) * 2004-03-25 2005-10-06 Geotop Corp Foundation structure
JP4468102B2 (en) * 2004-08-03 2010-05-26 大成建設株式会社 Pile head support structure
JP2007315136A (en) * 2006-05-29 2007-12-06 Taisei Corp Foundation structure using existing pile and new pile
JP4968676B2 (en) * 2007-05-14 2012-07-04 清水建設株式会社 Pile foundation reinforcement method using increased piles

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