INJECTION APPARATUS USED IN HIGH-PRESSURE INJECTION AND AGITATION METHOD, AND HIGH-PRESSURE INJECTION AND AGITATION METHOD

• Main Authors: SAITO HIDENORI, ONO KIYOTAKA
• Format: Patent
• Language: English; Japanese
• Published: 08.06.2023
• Subjects: EMBANKMENTS; EXCAVATIONS; FIXED CONSTRUCTIONS; FOUNDATIONS; HYDRAULIC ENGINEERING; SOIL SHIFTING; UNDERGROUND OR UNDERWATER STRUCTURES

To provide an injection apparatus which is free from restriction on increase in a nozzle size, enables easy structural design of a flow channel and has good fluid energy efficiency, and can improve construction efficiency of a high-pressure injection and agitation method.SOLUTION: An injection apparatus has a lower stage injection nozzle 21 of a curable material, and an upper stage injection nozzle 22 for compression air or high-pressure water are arranged at upper and lower parts of an apparatus side face. The lower stage injection nozzle 21 and the upper stage injection nozzle 22 are provided so that a vertical arrangement interval of the nozzles 21 and 22 is set at 34 mm and each of the nozzles has an angle of 2°, for example, so that jet flows are merged at a point of 500 mm from an apparatus center. For example, in construction in which general soil is regarded as an object ground, both fluids are integrated with each other by a negative pressure generated from a curable material jet which is jetted from the lower stage injection nozzle 21 and has large specific gravity, and destructive force and cutting force of the ground are increased.SELECTED DRAWING: Figure 2 【課題】ノズルサイズの拡大化に制約がなく、流路の構造設計が簡単であって流体のエネルギー効率が良好で、高圧噴射攪拌工法の施工効率を向上させる噴射装置を提供する。【解決手段】噴射装置は、硬化材の下段噴射ノズル２１と、圧縮エアーまたは高圧水用の上段噴射ノズル２２を、装置側面の上下に配置している。下段噴射ノズル２１と上段噴射ノズル２２は、例えば装置中心から500mmの地点で噴流が合流するように、ノズル２１，２２の上下配置間隔を34mmとし、各ノズルに２°の角度を付けて設けられている。例えば一般土を対象地盤とする施工では、下段噴射ノズル２１より噴射した比重の大きい硬化材ジェットから発生する負圧によって、双方の流体が一体化して地盤の破壊力および切削力を増加させる。【選択図】図２