JPH0144852B2 - - Google Patents
Info
- Publication number
- JPH0144852B2 JPH0144852B2 JP9505981A JP9505981A JPH0144852B2 JP H0144852 B2 JPH0144852 B2 JP H0144852B2 JP 9505981 A JP9505981 A JP 9505981A JP 9505981 A JP9505981 A JP 9505981A JP H0144852 B2 JPH0144852 B2 JP H0144852B2
- Authority
- JP
- Japan
- Prior art keywords
- foundation
- pile
- gravel
- foundation pile
- footing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000000034 method Methods 0.000 claims description 8
- 230000003014 reinforcing effect Effects 0.000 description 6
- 238000009415 formwork Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/34—Foundations for sinking or earthquake territories
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Foundations (AREA)
Description
【発明の詳細な説明】
本発明は、構造物基礎の築造方法に関し、基礎
杭１を所定位置に打設し、その後基礎杭１上部に
砂利２を敷きつめ、次にこの砂利２層上にフーチ
ング３を杭１に対して非連結状態で築造すること
を特徴とする構造物基礎の築造方法に係るもので
ある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for constructing a structure foundation, in which a foundation pile 1 is driven into a predetermined position, gravel 2 is then laid on top of the foundation pile 1, and then a footing is placed on the two layers of gravel. The present invention relates to a method for constructing a structure foundation, which is characterized in that the structure foundation is constructed in a state in which the foundation of the structure is constructed in a state where the foundation of the structure is constructed in a state in which the foundation of the structure is constructed in a state where the foundation of the structure is constructed in a state where the foundation of the structure is constructed in a state where the foundation of the structure is constructed in a state where the foundation of the structure is constructed in a state where the foundation of the structure is constructed in a state where the foundation of the structure is constructed in a state where the foundation of the structure is constructed without being connected to the pile 1.
従来構造物基礎を築造する場合、いわゆる、
“ベタ基礎”をのぞき、布基礎であれ、独立基礎
であれ、所定地盤に基礎杭を打設し、その上部に
上記布基礎、独立基礎等のフーチングを連結して
築造し（つまり基礎杭の上端をはつつて基礎杭に
埋入した鉄筋の上端を出し、この鉄筋の上端とフ
ーチング用の鉄筋とを連結し、その後コンクリー
トを打設してフーチングを築造し）、更にフーチ
ング上部に構造物を構築し、構造物荷重を基礎杭
で支えるのが通常の方法であつた。ところが上記
の従来の方法の場合構造物に、地震等により横力
が作用した場合、フーチングと連接した基礎杭、
特に基礎杭上部に水平力、回転力が作用し、杭体
が曲げモーメントによる引張り力、剪断力により
破損する虞れが有り、また上記水平力、回転力は
構造物を支える基礎杭の鉛直支持力に略比例して
大きくなる為、上記破損を防止するためには基礎
杭の水平耐力を大きく向上させる必要があり、基
礎構築法として、経済的でない欠点が有つた。 When constructing the foundation of a conventional structure, the so-called
Except for the "solid foundation", whether it is a cloth foundation or an independent foundation, the foundation pile is driven into the specified ground, and the footing of the above-mentioned cloth foundation, independent foundation, etc. is connected to the top of the foundation pile. The upper end of the reinforcing bar embedded in the foundation pile is removed, the upper end of the reinforcing bar is connected to the reinforcing bar for the footing, and then concrete is poured to build the footing. The usual method was to construct a structure and support the structural load with foundation piles. However, in the case of the above conventional method, if lateral force is applied to the structure due to an earthquake, etc., the foundation pile connected to the footing,
In particular, horizontal force and rotational force act on the upper part of the foundation pile, and there is a risk that the pile body will be damaged by the tensile force and shearing force caused by the bending moment. Since the force increases approximately in proportion to the force, in order to prevent the above-mentioned damage, it is necessary to greatly improve the horizontal strength of the foundation pile, which has the disadvantage that it is not economical as a foundation construction method.
本発明は上記の点に鑑みて発明したものであつ
て、その目的とするところは構造物の自重を支え
る基礎杭をフーチングと連結しないことで、地震
時に横力が作用しても基礎杭には水平力、回転力
が伝送されず、基礎杭に引張り応力や剪断力が発
生せず、したがつて基礎杭は圧縮応力のみを考慮
すればよく、鉛直荷重にのみ耐える基礎杭で十分
であるため大巾に経済性を高めることができ、ま
た地震時に基礎杭が破壊されたりすることがない
構造物基礎の築造方法を提供するにある。 The present invention was invented in view of the above points, and its purpose is to prevent the foundation piles that support the weight of the structure from being connected to the footings, so that even if lateral force acts during an earthquake, the foundation piles will not be connected to the footings. horizontal force and rotational force are not transmitted, and no tensile stress or shear force is generated on the foundation pile, so only compressive stress needs to be considered for the foundation pile, and a foundation pile that can only withstand vertical loads is sufficient. Therefore, it is an object of the present invention to provide a method for constructing a structure foundation that can greatly improve economic efficiency and prevent foundation piles from being destroyed during an earthquake.
以下本発明を実施例により詳述する。まず築造
しようとするフーチング３の下部の所定位置に複
数本の基礎杭１を打設する。ここで図の実施例で
は基礎杭１として上下の外周に複数個の節部４を
有する節杭が用いてある。このように基礎杭１と
して節杭を用いた場合基礎杭１打設時に基礎杭１
間に砂利２を充填する（節杭の貫入に伴い生じた
地盤５との杭間間隙に地上より砂利を補填しなが
ら節杭を打設する）とより良いものとなる。なお
基礎杭１上部頂面は築造しようとするフーチング
３下面より0.2M〜0.5M程度が望ましい。次に基
礎杭１上部に砂利２を築造しようとするフーチン
グ３の下面の範囲で敷きつめ、重錘等で締め固め
る。このとき砂利２の敷きつめ厚さは0.2M〜
1.0M程度とする。ここで杭頂部がフーチング３
下面に近い場合には第３図のように上方に位置す
る節部４の下方まで地盤５を掘削して砂利２を敷
きつめることとなる。砂利２層上面には合成樹脂
シート等の滑性の防水シート６を敷き、その後に
型枠７を仮設し、鉄筋８等を配設し、型枠７内に
生コンクリートを打設し、生コンクリート硬化後
に型枠７を撤去し、空隙部を土砂で埋めフーチン
グ３を築造する。フーチング３築造後は上部構造
物の柱、壁等の鉄筋とフーチング３内の鉄筋とを
連接して構築物を建造する。なお上記実施例では
基礎杭１として節杭の例を示したが、必ずしもこ
れにのみ限定されないのはもちろんであり、値の
種々の杭を用いることができる。 The present invention will be explained in detail below with reference to Examples. First, a plurality of foundation piles 1 are driven into predetermined positions below the footing 3 to be constructed. In the illustrated embodiment, a knotted pile having a plurality of knotted parts 4 on the upper and lower outer peripheries is used as the foundation pile 1. When a knot pile is used as the foundation pile 1 in this way, when the foundation pile 1 is driven, the foundation pile 1
It will be better if gravel 2 is filled between the piles (the joint piles are driven while supplementing gravel from the ground into the gap between the piles and the ground 5 that is created due to the penetration of the joint piles). The top surface of the foundation pile 1 is preferably about 0.2M to 0.5M higher than the bottom surface of the footing 3 to be constructed. Next, gravel 2 is laid on the top of the foundation pile 1 in the area below the footing 3 to be constructed, and compacted with a weight or the like. At this time, the thickness of gravel 2 is 0.2M ~
It should be about 1.0M. Here the top of the pile is footing 3
If it is close to the bottom surface, the ground 5 will be excavated to the bottom of the knot 4 located above, and gravel 2 will be laid down, as shown in FIG. A slippery waterproof sheet 6 such as a synthetic resin sheet is laid on the upper surface of the second layer of gravel, then a formwork 7 is temporarily installed, reinforcing bars 8, etc. are placed, ready-mixed concrete is poured into the formwork 7, After the concrete hardens, the formwork 7 is removed, and the gap is filled with earth and sand to construct the footing 3. After the footing 3 is constructed, the reinforcing bars of the columns, walls, etc. of the superstructure are connected to the reinforcing bars within the footing 3 to construct the structure. In the above embodiment, an example of a joint pile is shown as the foundation pile 1, but it is needless to say that the foundation pile 1 is not limited to this, and piles of various values can be used.
なお実施例のように砂利層に滑性の防水シート
を敷いてこの上に生コンクリートを打設してフー
チングを築造すると、生コンクリートが砂利層に
しみ込んで砂利層を硬化させることがなく、基礎
杭とフーチングとを非連結状態に保ち、また構造
物に地震時に横力が作用した場合滑性の防水シー
トによつて造築後のフーチング下面の滑りをよく
し、砂利粒のローラ作用とあいまつて基礎杭に水
平力、回転力が伝達されないものである。 In addition, if you build a footing by laying a slippery waterproof sheet on the gravel layer and pouring fresh concrete on top of it as in the example, the fresh concrete will not soak into the gravel layer and harden the gravel layer, and the foundation The piles and footings are kept in a disconnected state, and when lateral force is applied to the structure during an earthquake, the slippery waterproof sheet improves the slippage of the underside of the footing after construction, and prevents interference with the roller action of gravel grains. horizontal force and rotational force are not transmitted to the foundation pile.
本発明にあつては、叙述のように基礎杭上部に
砂利を敷きつめ、次にこの砂利層上にフーチング
を基礎杭に対して非連続状態で築造するので、基
礎杭はフーチング下面、砂利層を介して伝達され
る鉛直荷重Ｐ（構造物自重）のみを支えるもので
あり、構造物に地震時等に横力が作用した場合砂
利粒のローラ作用により基礎杭には水平力Ｈ、回
転力Ｍが伝達されず、従つて基礎杭に引張り応力
や剪断応力が発生しないものである。このため本
発明にあつては基礎杭は圧縮応力のみを考慮すれ
ばよく、鉛直荷重にのみ耐える基礎杭で十分であ
り、従来にくらべ大巾に経済性を高めることがで
き、また地震時等にも基礎杭が破壊せず、十分安
全な構築物を構築できるものである。なおまた基
礎杭として節杭を用いて上方の節部下部まで砂利
層を設けた場合には、砂利層のみで構造物荷重を
地盤及び基礎杭に伝達する場合にくらべ節部のく
い込みにより荷重の伝達が特に基礎杭への荷重の
伝達がより有効におこなえる。ところで砂利柱が
砂地盤の液状化（地盤の間隙水圧が上昇し地盤の
支持力を失わしめる事）防止に効果があることは
すでに知られているが、実施例のように基礎杭間
に充填した砂利壁と上部の砂利層とが連設してい
るため間隙水圧の上昇を防止することとなり（砂
利層は排水層の働きをする）、液状化の防止、即
ち地震による構造物の災害を防止することができ
る。 In the present invention, as described above, gravel is spread over the top of the foundation pile, and then the footing is built on this gravel layer in a discontinuous manner with respect to the foundation pile, so the foundation pile covers the bottom surface of the footing and the gravel layer. It supports only the vertical load P (the structure's own weight) transmitted through the foundation pile, and when lateral force acts on the structure during an earthquake, etc., the foundation pile receives horizontal force H and rotational force M due to the roller action of gravel grains. is not transmitted, and therefore no tensile stress or shear stress is generated in the foundation pile. Therefore, in the case of the present invention, only compressive stress needs to be considered for the foundation pile, and a foundation pile that can only withstand vertical loads is sufficient, making it possible to greatly improve economic efficiency compared to the conventional method. It is possible to construct a sufficiently safe structure without destroying the foundation piles. Furthermore, when knot piles are used as foundation piles and a gravel layer is provided to the bottom of the upper knots, the load is transferred by the penetration of the knots compared to when the structure load is transmitted to the ground and foundation piles using only the gravel layer. In particular, the load can be transmitted more effectively to the foundation piles. By the way, it is already known that gravel columns are effective in preventing liquefaction of sandy ground (in which the pore water pressure in the ground increases and the ground loses its bearing capacity), but as shown in the example, it is not necessary to fill it between the foundation piles. The gravel wall connected to the upper gravel layer prevents the rise in pore water pressure (the gravel layer acts as a drainage layer), preventing liquefaction and, in other words, preventing damage to structures caused by earthquakes. It can be prevented.
第１図は本発明方法により築造した建造物基礎
の一実施例の断面図、第２図は同上の型枠を仮設
した状態の断面図、第３図は本発明により築造し
た建造物基礎の他の実施例の断面図であつて、１
は基礎杭、２は砂利、３はフーチングである。
Fig. 1 is a cross-sectional view of one embodiment of a building foundation constructed by the method of the present invention, Fig. 2 is a cross-sectional view of the same formwork temporarily installed, and Fig. 3 is a cross-sectional view of a building foundation constructed by the present invention. 1 is a cross-sectional view of another embodiment;
is the foundation pile, 2 is the gravel, and 3 is the footing.
Claims (1)
部に砂利を敷きつめ、次にこの砂利層上にフーチ
ングを基礎杭に対して非連結状態で築造すること
を特徴とする構造物基礎の築造方法。 ２ 基礎杭として外周に節を有する節杭を用いる
ことを特徴とする特許請求の範囲第１項記載の構
造物基礎の築造方法。[Claims] 1. The method is characterized in that a foundation pile is driven into a predetermined position, gravel is then laid on top of the foundation pile, and then a footing is constructed on the gravel layer in a state that it is not connected to the foundation pile. A method of constructing foundations for structures. 2. A method for constructing a structure foundation according to claim 1, characterized in that a knotted pile having knots on the outer periphery is used as the foundation pile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9505981A JPS57209334A (en) | 1981-06-18 | 1981-06-18 | Construction of foundation for structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9505981A JPS57209334A (en) | 1981-06-18 | 1981-06-18 | Construction of foundation for structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57209334A JPS57209334A (en) | 1982-12-22 |
| JPH0144852B2 true JPH0144852B2 (en) | 1989-09-29 |
Family
ID=14127459
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9505981A Granted JPS57209334A (en) | 1981-06-18 | 1981-06-18 | Construction of foundation for structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57209334A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015183371A (en) * | 2014-03-20 | 2015-10-22 | 公益財団法人鉄道総合技術研究所 | Continuous ground improvement method in support base of linear structure having spread foundation |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59199919A (en) * | 1983-04-27 | 1984-11-13 | Hideaki Kishida | Pile foundation |
| JP2011032712A (en) * | 2009-07-31 | 2011-02-17 | Shimizu Corp | Foundation structure |
| JP5877482B2 (en) * | 2012-01-31 | 2016-03-08 | 清水建設株式会社 | Structure for reducing liquefaction damage of structures |
| JP5088982B1 (en) * | 2012-02-27 | 2012-12-05 | 株式会社サムシング | Outdoor structure foundation structure |
| JP6424504B2 (en) * | 2014-07-18 | 2018-11-21 | 株式会社大林組 | Foundation structure of structure |
| JP6614454B2 (en) * | 2016-10-20 | 2019-12-04 | 公益財団法人鉄道総合技術研究所 | Support structure of structure |
-
1981
- 1981-06-18 JP JP9505981A patent/JPS57209334A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015183371A (en) * | 2014-03-20 | 2015-10-22 | 公益財団法人鉄道総合技術研究所 | Continuous ground improvement method in support base of linear structure having spread foundation |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57209334A (en) | 1982-12-22 |
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