Composition suited for addition to ground excavation stabilizing liquid, stabilizing liquid composition, and ground excavation method

摘要

A composition suited for addition to ground excavation stabilizing liquid which are able to prevent effectively the deterioration of the stabilizing liquid due to seawater or cement mixing in or to prevent the putrefaction of the liquid by bacteria, an excavation stabilizing liquid composition, and a ground excavation method using these compositions are disclosed.PPThe composition suited for addition to excavation stabilizing liquid comprises a mono- valency salt (a) of unsaturated carboxylic acid (co)polymer of polymerization degree 5,000 or less and a compound (b) selected from a group composed of 1 mono-valency aluminate, 2 the group II or III metal oxide, and 3 salt of a higher order compound. The excavation stabilizing liquid compositions comprises said composition suited for addition to excavation stabilizing liquid, inorganic clay (c), and as necessary, a compound (d) selected from a group composed of water soluble cellulose derivatives, water soluble starch derivatives, polysaccharides and their derivatives. The ground excavation method is a method for excavating the ground by excavator with staying or circulating the excavation stabilizing liquid composition in the excavated area.