EXCAVATION-AGITATION TOOL

• Main Author: SATO ATSUYA
• Format: Patent
• Language: English; Japanese
• Published: 24.06.2019
• Subjects: EMBANKMENTS; EXCAVATIONS; FIXED CONSTRUCTIONS; FOUNDATIONS; HYDRAULIC ENGINEERING; SOIL SHIFTING; UNDERGROUND OR UNDERWATER STRUCTURES

To provide an excavation-agitation tool which, regardless of kinds of surrounding grounds, can cope with fastening of excavated and improved soil, which can suppress an engaging depth of a corotation preventing blade into surrounding grounds to a minimum or make the corotation preventing blade be in an immovable state with respect to a rotation direction without engagement, which can suppress rupture and deterioration of a blade and soil adhesion to the blade as much as possible, and which can remarkably improve agitation efficiency by securely preventing corotation phenomenon.SOLUTION: The excavation-agitation tool comprises: an excavation-agitation shaft 1 extending in a vertical direction; an excavation blade 2 supported on a lower end of the excavation-agitation shaft 1 and excavating a ground; a driving agitation blade 3 supported on an outer peripheral surface of the excavation-agitation shaft 1 and rotating together with the excavation-agitation shaft 1; and an arc-shaped agitation blade 5 straddlingly held by outer peripheral surfaces of at least two boss portions loosely fitted around an outer periphery of the excavation-agitation shaft 1 and swelling outward to make an arc shape. A rotation center line of the arc-shaped agitation blade 5 is in an eccentric position to a rotation center line of the excavation-agitation shaft 1.SELECTED DRAWING: Figure 1 【課題】周辺地盤の種類に左右されず、掘削・改良土の締まり込みに対応でき、共回り防止翼の周辺地盤への係合深さを最低限に抑え又は係合することなく共回り防止翼を回転方向に対して不動状態とし、翼の破損劣化と翼への土壌付着を可及的抑制でき、共回り現象を確実に防止して撹拌効率を飛躍的に向上させることができる掘削・撹拌具を提供する。【解決手段】上下方向に伸延した掘削・撹拌軸１と、掘削・撹拌軸１の下端に支持され地盤を掘削する掘削翼２と、掘削・撹拌軸１の外周面に支持され、掘削・撹拌軸１と一体に回転する駆動撹拌翼３と、掘削・撹拌軸１の外周廻りに遊嵌した少なくとも２つ以上のボス部の外周面に跨持され、外方へ膨出させて弧状に形成した弧状撹拌翼５と、を備え、弧状撹拌翼５の回転中心線は、上記掘削・撹拌軸１の回転中心線に対して偏心した位置にあることとした。【選択図】図１