JP2019065629A - Support structure for structural article - Google Patents
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- JP2019065629A JP2019065629A JP2017193657A JP2017193657A JP2019065629A JP 2019065629 A JP2019065629 A JP 2019065629A JP 2017193657 A JP2017193657 A JP 2017193657A JP 2017193657 A JP2017193657 A JP 2017193657A JP 2019065629 A JP2019065629 A JP 2019065629A
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- 239000010802 sludge Substances 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 9
- 239000002689 soil Substances 0.000 description 9
- 238000010276 construction Methods 0.000 description 7
- 230000000452 restraining effect Effects 0.000 description 4
- 238000005452 bending Methods 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007613 slurry method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
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Abstract
Description
本発明は、構造物の支持構造に関する。 The present invention relates to a support structure for a structure.
液状化地盤等の軟弱な地盤の上に構造物を構築する場合、地盤に基礎杭を建込んで杭基礎とする方法、又は例えば特許文献１に示すように、構造物の直下地盤に地盤改良体を構築した上で直接基礎とする方法の、主に２つの方法が挙げられる。 When building a structure on a soft ground such as liquefied ground, a method of building a foundation pile on the ground to form a pile foundation or ground improvement immediately below the structure as shown in Patent Document 1, for example There are two main ways to build the body and build on it directly.
しかし、杭基礎とする場合、杭に発生する曲げモーメントを曲げ戻す基礎梁等を構造物に設ける必要があり、また、地盤の支持層に傾斜がある場合には杭長の調整が難しい。一方、特許文献１に示すように直接基礎とする場合、構造物の下部にブロック状の地盤改良体を構築するため、排出汚泥の量が多くなるとともに高コストとなる。 However, in the case of a pile foundation, it is necessary to provide a foundation beam or the like for bending back the bending moment generated in the pile to the structure, and adjustment of the pile length is difficult when the support layer of the ground is inclined. On the other hand, in the case of direct foundation as shown in Patent Document 1, in order to construct a block-like ground improvement body at the lower part of the structure, the amount of discharged sludge increases and the cost becomes high.
本発明は上記事実に鑑み、排出汚泥の量及びコストを削減しつつ、液状化地盤の上に直接基礎で支持された構造物を構築することができる構造物の支持構造を提供することを目的とする。 SUMMARY OF THE INVENTION In view of the above facts, the present invention aims to provide a support structure for a structure capable of constructing a foundation-supported structure directly on liquefied ground while reducing the amount and cost of discharged sludge. I assume.
請求項１に記載の構造物の支持構造は、構造物の複数の柱をそれぞれ支持するフーチングと、前記フーチングの下部にそれぞれ独立して形成され、少なくとも液状化地盤層より下部まで延び、前記フーチングの直下地盤を囲うように配置された地盤改良体と、を有する。 The support structure of the structure according to claim 1 comprises a footing for respectively supporting a plurality of columns of the structure, and a lower portion of the footing formed independently of each other and extending at least below the liquefied ground layer, the footing And a ground improvement body disposed to surround the ground immediately below.
上記構成によれば、構造物のフーチングの直下地盤を囲うように配置された地盤改良体が、フーチングの下部にそれぞれ独立して形成されている。このため、フーチングの直下地盤を地盤改良体でそれぞれ囲んで拘束することができ、液状化時の地盤沈下を抑制することができる。また、構造物又はフーチングの直下地盤全体に地盤改良体を配置する構成と比較して、コストを削減することができ、排出汚泥も削減することができる。 According to the above configuration, the ground improvement bodies arranged to surround the ground immediately below the footing of the structure are formed independently in the lower portion of the footing. For this reason, the ground immediately below the footing can be respectively surrounded and restrained by the ground improvement body, and ground subsidence at the time of liquefaction can be suppressed. Moreover, compared with the structure which arrange | positions a ground improvement body in the whole soil directly under a structure or a footing, cost can be reduced and discharge sludge can also be reduced.
請求項２に記載の構造物の支持構造は、請求項１に記載の構造物の支持構造であって、前記地盤改良体で囲まれた前記直下地盤には、浅層地盤改良部が形成されている。 The support structure for a structure according to claim 2 is the support structure for a structure according to claim 1, wherein a shallow ground improvement portion is formed on the ground immediately below the ground improvement body. ing.
上記構成によれば、地盤改良体で囲まれた直下地盤に浅層地盤改良部が形成されている。このため、浅層地盤改良された直下地盤を地盤改良体で囲んで拘束することにより、液状化時の地盤沈下をより抑制することができる。 According to the above configuration, the shallow ground improvement portion is formed immediately below the ground surrounded by the ground improvement body. For this reason, it is possible to further suppress ground subsidence at the time of liquefaction by surrounding and immediately restraining the ground immediately after the shallow ground improvement with a ground improvement body.
請求項３に記載の構造物の支持構造は、請求項１に記載の構造物の支持構造であって、前記フーチングの周囲には、浅層地盤改良部が形成されており、前記浅層地盤改良部の下部に前記地盤改良体が配置されている。 The support structure for a structure according to claim 3 is the support structure for a structure according to claim 1, wherein a shallow ground improvement portion is formed around the footing, and the shallow ground ground The ground improvement body is disposed below the improvement section.
上記構成によれば、フーチングの周囲に浅層地盤改良部が形成されており、浅層地盤改良部の下部に地盤改良体が配置されている。このため、フーチングの周囲に浅層地盤改良部が形成されていない構成と比較して、液状化時の地盤沈下をより抑制することができる。 According to the above configuration, the shallow ground improvement portion is formed around the footing, and the ground improvement body is disposed below the shallow ground improvement portion. For this reason, ground subsidence at the time of liquefaction can be suppressed more compared with the composition where the shallow layer ground improvement part is not formed around footing.
本発明によれば、排出汚泥の量及びコストを削減しつつ、液状化地盤の上に直接基礎で支持された構造物を構築することができる。 According to the present invention, it is possible to construct a foundation-supported structure directly on liquefied ground while reducing the amount and cost of discharged sludge.
＜第１実施形態＞
以下、本発明の第１実施形態における構造物の支持構造について、図１及び図２を用いて説明する。
First Embodiment
Hereinafter, the support structure of the structure in 1st Embodiment of this invention is demonstrated using FIG.1 and FIG.2.
（構造）
図１、図２に示すように、本実施形態の構造物１０は、一例として液状化地盤層２２を有する液状化地盤上に構築された大型の建物であり、複数の柱１２を有している。柱１２は、例えば鉄骨造とされており、下部がフーチング１４によってそれぞれ支持されている。
(Construction)
As shown in FIG. 1 and FIG. 2, the structure 10 of the present embodiment is a large building constructed on liquefied ground having a liquefied ground layer 22 as an example, and has a plurality of columns 12 There is. The pillars 12 are made of, for example, a steel frame, and the lower portions thereof are respectively supported by the footings 14.
フーチング１４は、外寸が柱１２の外寸より大きい平面視で四角形状のコンクリート基礎であり、図２に示すように、柱１２の下端部に接合されたベースプレート１６がアンカーボルト１８によってフーチング１４の上部にそれぞれ固定されている。 The footing 14 is a concrete base having a rectangular shape in plan view whose outer size is larger than the outer size of the column 12, and as shown in FIG. 2, the base plate 16 joined to the lower end of the column 12 is footed 14 by anchor bolts 18. Each is fixed at the top of the
また、複数のフーチング１４の下部には、地盤改良体２０がそれぞれ設けられている。地盤改良体２０は、深層混合処理工法やソイルミキシングウォール工法等によって造成された水密構造の柱列であり、地盤改良体２０の下部は液状化地盤層２２の下部の支持層２４まで延びている。なお、地盤改良体２０の下部は少なくとも液状化地盤層２２より下部まで延びていればよい。 Moreover, the ground improvement body 20 is provided in the lower part of several footing 14, respectively. The ground improvement body 20 is a column of a watertight structure constructed by the deep layer mixing treatment method, soil mixing wall method, etc. The lower portion of the ground improvement body 20 extends to the support layer 24 below the liquefied ground layer 22 . The lower part of the ground improvement body 20 may extend to at least the lower part of the liquefied ground layer 22.
複数の地盤改良体２０は、フーチング１４毎にそれぞれ独立して形成されており、フーチング１４の直下地盤２６を囲うように配置されている。具体的には、本実施形態では、地盤改良体２０は平面視で口の字型に配置されており、内寸がフーチング１４の外寸より小さく、外寸がフーチング１４の外寸より大きくされていることにより、平面視でフーチング１４と一部がラップしている。 The plurality of ground improvement bodies 20 are formed independently for each footing 14 and are arranged to surround the ground 26 directly below the footing 14. Specifically, in the present embodiment, the ground improvement body 20 is disposed in a mouth shape in plan view, and the inner size is smaller than the outer size of the footing 14 and the outer size is larger than the outer size of the footing 14 As a result, part of the footing 14 and the footing 14 wrap in plan view.
さらに、フーチング１４の直下地盤２６における地盤改良体２０で囲われた部分には、浅層地盤改良部２８が形成されている。浅層地盤改良部２８は、浅層地盤改良工法やエスミックスラリー工法等によって造成された水密構造の層であり、フーチング１４の下部から３ｍ以内程度の浅層部分に設けられている。 Furthermore, a shallow soil ground improvement portion 28 is formed in a portion surrounded by the ground improvement body 20 in the ground 26 directly below the footing 14. The shallow ground improvement unit 28 is a layer having a watertight structure created by a shallow ground improvement method, an Sismic slurry method, or the like, and is provided in a shallow layer within about 3 m from the lower part of the footing 14.
（施工方法）
構造物１０を地盤改良体２０で支持する場合、まず、オーガ等の図示しない杭打ち機によって、一部がラップして連続する複数の円柱状の地盤改良柱を直下地盤２６に形成する。
(Construction method)
When the structure 10 is supported by the ground improvement body 20, first, a plurality of columnar ground improvement columns which are continuous by being partially wrapped are formed in the ground 26 directly below by a piling machine (not shown) such as an auger.
地盤改良柱は、直下地盤２６の掘削土にセメントミルク等の安定剤を注入し、混合、攪拌したものであり、複数の地盤改良柱によって平面視で口の字型とされた柱列状の地盤改良体２０が形成される。 The ground improvement pillars are obtained by injecting a stabilizer such as cement milk into the excavated soil of the ground 26 directly below, mixing and stirring, and a row of pillars having a mouth shape in plan view by a plurality of ground improvement pillars The ground improvement body 20 is formed.
次に、フーチング１４を形成するための根切り面まで、直下地盤２６の浅層部分を掘削する。そして、直下地盤２６における地盤改良体２０で囲われた部分の上部にセメント等の安定材を粉体状態又は混練状態で散布し、ユンボ等の施工機により攪拌、混合して締固めることにより、浅層地盤改良部２８を形成する。 Next, the shallow layer portion of the ground 26 immediately below is excavated up to the rooting plane for forming the footing 14. Then, a stabilizer such as cement is dispersed in the powder state or the kneading state on the upper part of the portion surrounded by the ground improvement body 20 in the ground 26 directly below, and is stirred, mixed and compacted by a construction machine such as Yumbo, A shallow ground improvement section 28 is formed.
その後、地盤改良体２０及び浅層地盤改良部２８の上部にコンクリートを打設してフーチング１４を形成する。なお、フーチング１４は地盤改良体２０の上端部に直接載置してもよく、敷き砂や捨てコンを介して載置してもよい。フーチング１４を地盤改良体２０の上端部に直接載置する場合には、施工誤差を吸収するためにフーチング１４の下部に打増しを設けておくとよい。 Thereafter, concrete is cast on the ground improvement body 20 and the shallow soil ground improvement portion 28 to form the footing 14. The footing 14 may be placed directly on the upper end portion of the ground improvement body 20, or may be placed via a laying sand or a disposal console. When the footing 14 is directly placed on the upper end portion of the ground improvement body 20, it is preferable to provide additional hitting at the lower portion of the footing 14 in order to absorb a construction error.
その後、フーチング１４を埋め戻してフーチング１４の上部に露出するアンカーボルト１８を柱１２の下端部に接合されたベースプレート１６の孔に挿入し、アンカーボルト１８にナット３０を螺合することで、フーチング１４に構造物１０の柱１２を固定する。 Thereafter, the footing 14 is backfilled and the anchor bolt 18 exposed at the top of the footing 14 is inserted into the hole of the base plate 16 joined to the lower end of the column 12 and the nut 30 is screwed onto the anchor bolt 18 The pillars 12 of the structure 10 are fixed to 14.
そして、液状化地盤上に土間コンクリート３２を打設し、構造物１０のその他の図示しないスラブや梁等を施工して構造物１０を構築する。なお、上記工程は一例であり、他の工程が含まれていたり、施工順が異なっていたりしても構わない。 Then, concrete between the soils 32 is placed on the liquefied ground, and the other not-shown slabs and beams of the structure 10 are constructed to construct the structure 10. In addition, the said process is an example and another process may be included, and the order of construction may differ.
（作用及び効果）
本実施形態によれば、構造物１０の柱１２を支持するフーチング１４の下部に、フーチング１４の直下地盤２６を囲うように配置された地盤改良体２０がそれぞれ独立して形成されている。
(Action and effect)
According to this embodiment, the ground improvement bodies 20 arranged to surround the ground 26 directly below the footing 14 are formed independently under the footing 14 supporting the columns 12 of the structure 10.
このため、フーチング１４の直下地盤２６を地盤改良体２０でそれぞれ囲んで拘束することができ、液状化時の地盤沈下を抑制することができる。また、構造物１０の下部全体又はフーチング１４の直下地盤２６全体に地盤改良体２０を配置する構成と比較して、コストを削減することができ、排出汚泥も削減することができる。 For this reason, the ground 26 directly below the footing 14 can be surrounded by the ground improvement body 20, and can be restrained, whereby the ground subsidence at the time of liquefaction can be suppressed. Moreover, compared with the structure which arranges the ground improvement body 20 in the whole lower part of the structure 10 or the whole foundation 26 directly under the footing 14, cost can be reduced and discharge sludge can also be reduced.
また、本実施形態によれば、フーチング１４の直下地盤２６における地盤改良体２０で囲われた部分に、浅層地盤改良部２８が形成されている。このため、浅層地盤改良された直下地盤２６を地盤改良体２０で囲んで拘束することができ、液状化時の地盤沈下をより抑制することができる。 Further, according to the present embodiment, the shallow ground improvement unit 28 is formed in a portion surrounded by the ground improvement body 20 in the ground 26 directly below the footing 14. For this reason, it is possible to surround and restrain the ground 26 immediately under the shallow layer ground improvement with the ground improvement body 20, and it is possible to further suppress ground subsidence at the time of liquefaction.
また、浅層地盤改良工法は、深層混合処理工法やソイルミキシングウォール工法等と比較して、オーガ等の大型の杭打ち機を必要としないため、地盤改良体２０で囲われた部分にも地盤改良体２０を形成する構成と比較して、施工が容易となるとともにコストを削減することができる。 In addition, the shallow soil improvement method does not require a large pile driver such as an auger compared to the deep mixing treatment method or the soil mixing wall method, and so the ground is surrounded by the ground improvement body 20. As compared with the configuration for forming the improved body 20, the construction can be facilitated and the cost can be reduced.
さらに、本実施形態によれば、地盤改良体２０は、平面視でフーチング１４と一部がラップしており、下部が液状化地盤層２２の下部まで延びて支持層２４に定着している。このため、フーチング１４を地盤改良体２０で直接支持することができるとともに、地盤改良体２０の支持力を高めることができる。 Furthermore, according to the present embodiment, the ground improvement body 20 partially wraps with the footing 14 in plan view, and the lower portion extends to the lower portion of the liquefied ground layer 22 and is fixed to the support layer 24. Therefore, the footing 14 can be directly supported by the ground improvement body 20, and the support force of the ground improvement body 20 can be enhanced.
＜第２実施形態＞
次に、本発明の第２実施形態における構造物の支持構造について、図３を用いて説明する。なお、第１実施形態と同様の構成については、図示及び説明を省略する。
Second Embodiment
Next, a support structure of a structure according to a second embodiment of the present invention will be described with reference to FIG. In addition, illustration and description are abbreviate | omitted about the structure similar to 1st Embodiment.
図３に示すように、本実施形態では、図示しない構造物の柱４２を支持するフーチング４４の周囲に、浅層地盤改良部４６が形成されている。浅層地盤改良部４６は、第１実施形態の浅層地盤改良部２８と同様の水密構造の層であり、フーチング４４の周囲における液状化地盤層４８の浅層部分に設けられている。 As shown in FIG. 3, in the present embodiment, a shallow ground improvement portion 46 is formed around a footing 44 that supports a column 42 of a structure not shown. The shallow ground improvement unit 46 is a layer having a watertight structure similar to the shallow ground improvement unit 28 of the first embodiment, and is provided in the shallow layer portion of the liquefied ground layer 48 around the footing 44.
また、浅層地盤改良部４６の下部には、地盤改良体５０が配置されている。地盤改良体５０は、第１実施形態の地盤改良体２０と同様の水密構造の柱列であり、下部が液状化地盤層４８の下部の支持層５２まで延びている。また、地盤改良体５０は、フーチング４４の直下地盤５４を囲うように平面視で口の字型に配置されており、平面視でフーチング４４と一部がラップしている。 Moreover, the ground improvement body 50 is arrange | positioned in the lower part of the shallow layer ground improvement part 46. As shown in FIG. The ground improvement body 50 is a column row of a watertight structure similar to the ground improvement body 20 of the first embodiment, and the lower portion extends to the support layer 52 below the liquefied ground layer 48. The ground improvement body 50 is disposed in a mouth shape in plan view so as to surround the ground 54 immediately below the footing 44, and a part of the ground improvement body 50 and the footing 44 wrap in the plan view.
（施工方法）
構造物の柱４２を地盤改良体５０で支持する場合、まず、第１実施形態と同様に、オーガ等の図示しない杭打ち機によって直下地盤５４に柱列状の地盤改良体５０を形成する。
(Construction method)
When the columns 42 of the structure are supported by the ground improvement body 50, first, the column-like ground improvement body 50 is formed on the ground 54 immediately below by a not-shown piling machine such as an auger as in the first embodiment.
次に、フーチング４４の周囲における液状化地盤層４８の浅層部分を根切りして、直下地盤５４における地盤改良体５０の上部に浅層地盤改良部４６の一部を形成する。そして、地盤改良体５０の上部に形成した浅層地盤改良部４６の上部にコンクリートを打設してフーチング４４を形成する。 Next, the shallow layer portion of the liquefied ground layer 48 around the footing 44 is cut off to form a part of the shallow layer ground improvement portion 46 on the upper part of the ground improvement body 50 in the ground 54 directly below. Then, concrete is cast on the upper part of the shallow ground improvement part 46 formed on the upper part of the ground improvement body 50 to form the footing 44.
その後、フーチング４４を埋め戻してフーチング４４の周囲に浅層地盤改良部４６の残りの部分を形成し、フーチング４４に柱４２を固定するとともに浅層地盤改良部４６上に土間コンクリート５６及びその他の図示しないスラブや梁等を施工する。 Thereafter, the footing 44 is backfilled to form the remaining portion of the shallow ground improvement portion 46 around the footing 44, and the pillars 42 are fixed to the footing 44 and the soil concrete 56 and the other on the shallow ground improvement portion 46. Construct slabs and beams not shown.
（作用及び効果）
本実施形態によれば、フーチング４４の周囲に浅層地盤改良部４６が形成されている。このため、浅層地盤改良部４６によってフーチング４４を支持することができ、フーチング４４の周囲に浅層地盤改良部４６が形成されていない構成と比較して、液状化時の地盤沈下を抑制することができる。
(Action and effect)
According to the present embodiment, the shallow ground improvement unit 46 is formed around the footing 44. For this reason, the footing 44 can be supported by the shallow layer ground improvement unit 46, and compared with the configuration in which the shallow layer ground improvement unit 46 is not formed around the footing 44, ground settlement during liquefaction is suppressed. be able to.
また、浅層地盤改良部４６の下部に、フーチング４４の直下地盤５４を囲うように配置された地盤改良体５０が形成されている。このため、浅層地盤改良部４６を地盤改良体５０で支持するとともに、フーチング４４の直下地盤５４を地盤改良体５０で囲んで拘束することができ、液状化時の地盤沈下をより抑制することができる。 Moreover, the ground improvement body 50 arrange | positioned so that the ground 54 directly under the footing 44 may be surrounded is formed in the lower part of the shallow layer ground improvement part 46. As shown in FIG. For this reason, while supporting the shallow layer ground improvement part 46 with the ground improvement body 50, the ground 54 directly under the footing 44 can be surrounded by the ground improvement body 50 and restrained, and the ground settlement at the time of liquefaction is further suppressed. Can.
＜その他の実施形態＞
以上、本発明について第１、第２実施形態を説明したが、本発明はかかる実施形態に限定されるものではなく、本発明の範囲内にて他の種々の実施形態が可能である。
<Other Embodiments>
The first and second embodiments of the present invention have been described above, but the present invention is not limited to such embodiments, and various other embodiments are possible within the scope of the present invention.
例えば、第１実施形態では、直下地盤２６における地盤改良体２０で囲われた部分に浅層地盤改良部２８が形成されていたが、図４に示すように、直下地盤６０に浅層地盤改良部２８を形成しない構成としてもよい。 For example, in the first embodiment, the shallow ground improvement portion 28 is formed in a portion surrounded by the ground improvement body 20 in the ground 26 immediately below, but as shown in FIG. The portion 28 may not be formed.
浅層地盤改良部２８を形成しなくとも、直下地盤６０を地盤改良体６２で囲んで拘束することで液状化時の地盤沈下を抑制することができる。なお、浅層地盤改良部２８の代わりに、図４に仮想線で示すように、下部が支持層６４に達する杭６６によってフーチング６８を支持する構成としてもよい。 Even if the shallow ground improvement section 28 is not formed, by restraining the ground 60 immediately below the ground improvement body 62 and restraining it, ground settlement at the time of liquefaction can be suppressed. The footing 68 may be supported by a pile 66 whose lower portion reaches the support layer 64 as shown by a phantom line in FIG.
また、第１、第２実施形態では、地盤改良体２０、５０の一部が平面視でフーチング１４、４４とラップする構成とされていた。しかし、図４に示すように、地盤改良体６２が平面視でフーチング６８とラップせず、フーチング６８の外側に位置する構成とされていてもよい。 Moreover, in 1st, 2nd embodiment, it was set as the structure which a part of ground improvement body 20 and 50 wraps with footing 14 and 44 by planar view. However, as shown in FIG. 4, the ground improvement body 62 may not be wrapped with the footing 68 in plan view, and may be configured to be located outside the footing 68.
地盤改良体６２とフーチング６８とがラップしなくとも、フーチング６８の直下地盤６０を地盤改良体６２によって囲んで拘束することで、液状化時の地盤沈下を抑制することができる。 Even if the ground improvement body 62 and the footing 68 do not wrap, by restraining the ground 60 directly below the footing 68 by the ground improvement body 62, it is possible to suppress ground subsidence at the time of liquefaction.
さらに、第１、第２実施形態では、地盤改良体２０、５０が平面視で口の字型に配置されていた。しかし、地盤改良体２０、５０は、フーチング１４、４４の直下地盤２６、５４を囲むことができる形状とされていればよく、例えば図５に示す地盤改良体７０のように、平面視で田の字型とされていてもよい。その他、平面視で日の字型等とされていてもよい。 Furthermore, in the first and second embodiments, the ground improvement bodies 20 and 50 are arranged in a mouth shape in plan view. However, the ground improvement bodies 20 and 50 may be shaped so as to surround the grounds 26 and 54 immediately below the footings 14 and 44. For example, as in the ground improvement body 70 shown in FIG. It may be in the shape of Besides, it may be shaped like a sun-shape in plan view.
１０ 構造物
１２、４２ 柱
１４、４４、６８ フーチング
２０、５０、６２、７０ 地盤改良体
２２、４８ 液状化地盤層
２６、５４、６０ 直下地盤
２８、４６ 浅層地盤改良部
10 Structure 12, 42 Pillar 14, 44, 68 Footing 20, 50, 62, 70 Ground improvement 22, 48 Liquefied ground layer 26, 54, 60 Ground 28, 46 immediately below ground improvement part
Claims (3)
前記フーチングの下部にそれぞれ独立して形成され、少なくとも液状化地盤層より下部まで延び、前記フーチングの直下地盤を囲うように配置された地盤改良体と、
を有する構造物の支持構造。 Footings that respectively support multiple columns of the structure;
A ground improvement body which is independently formed in the lower part of the footing, extends at least below the liquefied ground layer, and is disposed to surround the ground immediately below the footing,
Support structure of a structure having
前記浅層地盤改良部の下部に前記地盤改良体が配置されている、
請求項１に記載の構造物の支持構造。 A shallow ground improvement section is formed around the footing,
The ground improvement body is disposed below the shallow ground improvement section.
A support structure for the structure of claim 1.
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| JP2021046766A (en) * | 2019-09-20 | 2021-03-25 | 株式会社竹中土木 | Liquefaction countermeasure structure of underground structure |
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