Spiral piles are made by twisting flat steel plates and can be driven by rotary penetration only by human power, so they are expected to be used in construction sites that are so narrow that heavy machinery cannot enter. However, many points are unclear regarding the bearing capacity characteristics of spiral piles, especially regarding vertical pull-out resistance. In addition, the principle of pull-out behavior assumed at actual construction sites has not been fully clarified. Therefore, in this study, a pull-out test of a model pile was conducted using Toyoura dry sand, and the effects of the degree of construction accuracy, such as over-rotation, pushing, and pile shaking during driving, were examined. The effects of the decrease in construction accuracy for pull-out resistance tended to differ depending on the distance between two piles. These are thought to be caused by changes in the ground density around the piles owing to the placement of the piles.
"},{"@language":"ja","@value":"スパイラル杭は，平鋼板をねじって作られる杭であり，人力のみで回転貫入により打ち込むことができるため，狭隘で重機が入らない工事現場での採用が期待されている．しかしながら，スパイラル杭に関する支持力特性に関しては不明な点が多く，特に鉛直方向の引抜き抵抗特性（最大引抜き抵抗力および杭頭ばね定数）に関しては，施工の精度が抵抗力に与える影響など，実際の施工現場で想定される引抜きの挙動の原理が十分に解明されていないのが現状である．そこで本研究では，豊浦乾燥砂における模型杭の引抜き実験を実施し，打設時の過回転，押込み，杭体のブレといった施工精度の影響を検討した．その結果，施工精度の違いによる引抜き抵抗特性に及ぼす影響は，杭中心間隔によって異なる傾向を示した．これらは杭の打設によって杭周辺の地盤密度が変化することによって生じたと考えられる．
"}],"abstractLicenseFlag":"disallow"}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1410013884655559297","@type":"Researcher","foaf:name":[{"@language":"en","@value":"KINASHI Yuta"},{"@language":"ja","@value":"木梨 優太"}],"jpcoar:affiliationName":[{"@language":"ja","@value":"中央大学大学院 理工学研究科都市人間環境学専攻"}]},{"@id":"https://cir.nii.ac.jp/crid/1410013884655559296","@type":"Researcher","foaf:name":[{"@language":"en","@value":"NISHIOKA Hidetoshi"},{"@language":"ja","@value":"西岡 英俊"}],"jpcoar:affiliationName":[{"@language":"ja","@value":"中央大学 理工学部都市環境学科"}]}],"publication":{"publicationIdentifier":[{"@type":"EISSN","@value":"24366021"}],"prism:publicationName":[{"@language":"en","@value":"Japanese Journal of JSCE"},{"@language":"ja","@value":"土木学会論文集"},{"@language":"en","@value":"Japanese Journal of JSCE"},{"@language":"ja","@value":"土木学会論文集"}],"dc:publisher":[{"@language":"en","@value":"Japan Society of Civil Engineers"},{"@language":"ja","@value":"公益社団法人 土木学会"}],"prism:publicationDate":"2023","prism:volume":"79","prism:number":"15","prism:startingPage":"n/a"},"reviewed":"false","url":[{"@id":"https://www.jstage.jst.go.jp/article/jscejj/79/15/79_22-15043/_pdf"}],"availableAt":"2023","foaf:topic":[{"@id":"https://cir.nii.ac.jp/all?q=spiral%20pile","dc:title":"spiral pile"},{"@id":"https://cir.nii.ac.jp/all?q=construction%20accuracy","dc:title":"construction accuracy"},{"@id":"https://cir.nii.ac.jp/all?q=pull-out%20resistance","dc:title":"pull-out resistance"},{"@id":"https://cir.nii.ac.jp/all?q=group%20pile%20effect","dc:title":"group pile effect"},{"@id":"https://cir.nii.ac.jp/all?q=spiral%20pile","dc:title":"spiral pile"},{"@id":"https://cir.nii.ac.jp/all?q=construction%20accuracy","dc:title":"construction accuracy"},{"@id":"https://cir.nii.ac.jp/all?q=pull-out%20resistance","dc:title":"pull-out resistance"},{"@id":"https://cir.nii.ac.jp/all?q=group%20pile%20effect","dc:title":"group pile effect"}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1390282680233224832","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@language":"ja","@value":"スパイラルパイル施工時の回転条件が鉛直支持力に与える影響に関する基礎的検討"},{"@language":"en","@value":"Effect of shaft rotation of spiral piles under its installation on vertical bearing capacity"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282681025442304","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Study on the Estimation of the Axial Resistance of Spiral Bar Based on Interaction with Ground"},{"@language":"ja","@value":"地盤との連成挙動に基づくスパイラルバーの軸方向抵抗力算定法に関する研究"},{"@language":"ja-Kana","@value":"ジバン ト ノ レンセイキョドウ ニ モトヅク スパイラルバー ノ ジク ホウコウ テイコウリョク サンテイホウ ニ カンスル ケンキュウ"}]}],"dataSourceIdentifier":[{"@type":"JALC","@value":"oai:japanlinkcenter.org:2010251764"},{"@type":"CROSSREF","@value":"10.2208/jscejj.22-15043"}]}