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A platform for research: civil engineering, architecture and urbanism
EXECUTION METHOD OF HIGH-PRESSURE INJECTION AND AGITATION METHOD, GROUND IMPROVEMENT BODY AND CONSTRUCTION BODY
PROBLEM TO BE SOLVED: To provide an execution method capable of reducing an excess portion exceeding an effective wall thickness to an extent possible without narrowing a pitch between improvement bodies constructed, at the same time facilitating machine control when constructing the improvement body.SOLUTION: When constructing a construction body constituted by a plurality of improvement bodies using a high-pressure injection and agitation method, each of the improvement bodies is constructed so as to have a cross-section shape that combines a plurality of types (preferably about two to five types) of fan shapes having different diameters. The cross-section shape of the improvement body comprises at least two types of fan shapes, namely a small-diameter fan shape and a large-diameter fan shape, to have a small diameter part constituted by the small-diameter fan shape and a large-diameter part constituted by the large-diameter fan shape. A central angle is determined based on the smallest-diameter fan shape, relative to an effective wall thickness. When constructing the improvement body, the diameter of the improvement body is controlled by intermittently changing a rotation number of an injection pipe. In the process, the diameter of the improvement body and the effective wall thickness may be confirmed by monitoring a ground cutting state by a high-pressure injected improvement material.SELECTED DRAWING: Figure 1
【課題】造成する改良体のピッチを狭めることなく、有効壁厚を超える余分な部分を可能な限り減らすことができ、しかも改良体造成時の機械制御が簡単な施工方法を提供する。【解決手段】高圧噴射攪拌工法を利用して複数本の改良体で構成される造成体を造成する場合において、径が異なる複数種（好ましくは２〜５種類程度）の扇形を組み合わせた形状で改良体の断面形状が構成されるように、各改良体を造成する。改良体の断面形状は、小径の扇形と大径の扇形の少なくとも２種の組み合わせで構成され、小径の扇形からなる小径部と大径の扇形からなる大径部を有し、有効壁厚に対して最小径の扇形から中心角を決定する。改良体を造成するときには、噴射管の回転数を断続的に変化させることによって、該改良体の径をコントロールする。その際、高圧噴射される改良材による地盤切削状態をモニタリングし、改良体径や有効壁厚を確認してもよい。【選択図】図１
EXECUTION METHOD OF HIGH-PRESSURE INJECTION AND AGITATION METHOD, GROUND IMPROVEMENT BODY AND CONSTRUCTION BODY
PROBLEM TO BE SOLVED: To provide an execution method capable of reducing an excess portion exceeding an effective wall thickness to an extent possible without narrowing a pitch between improvement bodies constructed, at the same time facilitating machine control when constructing the improvement body.SOLUTION: When constructing a construction body constituted by a plurality of improvement bodies using a high-pressure injection and agitation method, each of the improvement bodies is constructed so as to have a cross-section shape that combines a plurality of types (preferably about two to five types) of fan shapes having different diameters. The cross-section shape of the improvement body comprises at least two types of fan shapes, namely a small-diameter fan shape and a large-diameter fan shape, to have a small diameter part constituted by the small-diameter fan shape and a large-diameter part constituted by the large-diameter fan shape. A central angle is determined based on the smallest-diameter fan shape, relative to an effective wall thickness. When constructing the improvement body, the diameter of the improvement body is controlled by intermittently changing a rotation number of an injection pipe. In the process, the diameter of the improvement body and the effective wall thickness may be confirmed by monitoring a ground cutting state by a high-pressure injected improvement material.SELECTED DRAWING: Figure 1
【課題】造成する改良体のピッチを狭めることなく、有効壁厚を超える余分な部分を可能な限り減らすことができ、しかも改良体造成時の機械制御が簡単な施工方法を提供する。【解決手段】高圧噴射攪拌工法を利用して複数本の改良体で構成される造成体を造成する場合において、径が異なる複数種（好ましくは２〜５種類程度）の扇形を組み合わせた形状で改良体の断面形状が構成されるように、各改良体を造成する。改良体の断面形状は、小径の扇形と大径の扇形の少なくとも２種の組み合わせで構成され、小径の扇形からなる小径部と大径の扇形からなる大径部を有し、有効壁厚に対して最小径の扇形から中心角を決定する。改良体を造成するときには、噴射管の回転数を断続的に変化させることによって、該改良体の径をコントロールする。その際、高圧噴射される改良材による地盤切削状態をモニタリングし、改良体径や有効壁厚を確認してもよい。【選択図】図１
EXECUTION METHOD OF HIGH-PRESSURE INJECTION AND AGITATION METHOD, GROUND IMPROVEMENT BODY AND CONSTRUCTION BODY
高圧噴射攪拌工法の施工方法、地盤改良体および造成体
OSAWA KAZUMI (author) / NIIZAKA TAKASHI (author)
2017-02-16
Patent
Electronic Resource
Japanese
IPC:
E02D
FOUNDATIONS
,
Gründungen
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