Grout compound grout apparatus and fixed end by remigrout utilize simultaneous injection reinforcing tunnelling method

摘要

An objective of the present invention is to provide a grouting material, a grouting device and a front end remitar fixing-type simultaneous injection steel pipe reinforcing method, which prevent backflow of the grouting material and can improve reinforcement strength of the grouting material by forming inner tubes of a multistage structure in a steel pipe, grouting a first grouting material in the periphery of a front end portion of the steel pipe, and allowing a second grouting material to be grouted from a rear end of an insertion end part of the steel pipe to the periphery of a caulking member of a rear end portion of the steel pipe. The grouting device according to the present invention includes: the steel pipe which is inserted into a perforation hole; partition walls which form a plurality of compartments by dividing an inner hollow part of the steel pipe into a plurality of inner hollow parts of the steel pipe; a first injection inner tube which has a predetermined length and sequentially passes through the partition walls inside the steel pipe, of which an end portion is disposed in a compartment positioned in a front end portion of the insertion end part of the steel pipe among the plurality of compartments divided inside the steel pipe by the partition walls, and into which the first grouting material is injected; a plurality of second injection inner tubes which have a shorter length compared to the first injection inner tube and sequentially pass through the partition walls inside the steel pipe, of which end portion is disposed in every compartment after the compartment of the steel pipe having the first injection inner tube disposed therein, and into which the second grouting material is injected; a plurality of grouting valves which is formed on an outer circumferential surface of the steel pipe so that the first and second grouting materials are diffused and grouted in the periphery of the perforation hole by being discharged to the outside of the steel pipe; and a backflow preventing packing which is formed in an expandable structure outside a boundary portion of the steel pipe having the first and second grouting materials discharged therefrom, and prevents backflow of the first grouting material to a grouting region of the second grouting material by closing a space between the perforation hole and the outer circumferential surface of the steel pipe as the first grouting material is injected and expanded into the steel pipe when discharging the first grouting material.