REINFORCEMENT MATERIAL AND GROUND REINFORCEMENT METHOD: Fid-Bau Portal

REINFORCEMENT MATERIAL AND GROUND REINFORCEMENT METHOD

SAITO TASUKU / KUBOZUKA DAISUKE / MIKAMI NOBORU

To provide a reinforcement material and a ground reinforcement method not requiring a large boring machine such as a machine for a double pipe boring, allowing construction even at a narrow site to be carried out, and not requiring filling of cement milk in a bore hole.SOLUTION: A reinforcement material (10) of the present invention comprises a core material (1) and screw blades (2) in a spiral shape arranged on an outer periphery of the core material. The screw blades have such a shape of being screwed in the ground through rotation thereof, the screw blades do not extend over a whole length of the core material and are intermittently arranged on the underground side further than a slide surface (SS) at a construction site, a distance (NP) between adjacent screw blades is an integral multiple of a pitch (SP) of the screw blades, and an outer diameter (WD) of the screw blade is equal to or larger than an outer diameter (PD) of a compressed area (PA) around the core material when the core material is pressed-in the ground as well as allows the same to be screwed in the soil, which is used by combination of a bearing plate (3) having such rigidity that force acting on the ground side rather than the slide surface can be neglected.SELECTED DRAWING: Figure 1

【課題】二重管削孔用の様な大型な削孔機械を必要とせず、狭隘な現場でも施工出来、しかも、掘削孔にセメントミルクを充填する必要がない補強材と地盤補強工法の提供。【解決手段】本発明の補強材（１０）は、芯材（１）と、芯材の外周に設けられた螺旋形状のスクリュー羽根（２）を有しており、スクリュー羽根は回転して地中にねじ込まれる形状であり、スクリュー羽根は芯材の全長に亘って延在せず、施工現場のすべり面（ＳＳ）よりも地中側に断続的に設けられ、隣接するスクリュー羽根間の距離（ＮＰ）はスクリュー羽根のピッチ（ＳＰ）の整数倍であり、スクリュー羽根の外径寸法（ＷＤ）は、芯材を地中に圧入した際の芯材周囲で圧縮される領域（ＰＡ）の外径寸法（ＰＤ）と同等或いはそれよりも大きく、且つ、土壌にねじ込み可能な寸法であり、すべり面よりも地上側に作用する力が無視できる様な剛性を有する支圧板（３）と組み合わせて用いられる。【選択図】図１

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