The road widening engineering works construction method null which uses foaming Characteristic resin

摘要

PURPOSE:To make ground widening possible by foaming resin by placing a required amount of material beads in a mold form, set up in a widening work site, and foaming the material beads by heat through injection pipes driven into the ground and inserted through inside this mold form. CONSTITUTION:A widening device is constituted of a mold form 1 set up in a tilted wall surface 9, plurality of injection pipes 2 and hoses 3, steam storage tank 4, pressure pump 6 and a boiler 7 or the like. The injection pipe 2 is provided with a function for serving also as a water bleed pipe for discharging infiltrating water of the tilted wall surface 9, by driving the injection pipe 2 into the ground through inside the mold form 1 to be held by a foaming unit after it is foamed. Next, the mold form 1 is charged with a beads material 8 of about 90kg per about 3m3 internal volume, and successively, steam of about 100 deg.C temperature is jetted from the injection pipe 2 for about 15min at a flow rate of about 0.4m3 per minute. In this way, the foaming unit of holding the injection pipe 2 can be formed in a compressed condition.