Cement-polyurethane composite grouting process capable of blocking water fast

Abstract

The invention discloses a cement-polyurethane composite grouting process capable of blocking water fast. The cement-polyurethane composite grouting process includes the steps of a, performing engineering exploration, to be more specific, designing a plurality of holes after the optimal reaction positions of polyurethane grout are determined according to the stratum cracks or the flowability of flowing water, wherein the holes should communicate water leakage points as much as possible or penetrate a plurality of stratum cracks to allow one hole to penetrate multiple stratums; b, drilling; c, grouting, to be more specific, simultaneously and alternately grouting the polyurethane grout and cement grout into all holes, using the instant foaming and curing feature, which uses water to stop water, of the polyurethane grouted first to stop and block water, using the cement grout grouted later to stop the backflow of the polyurethane so as to form a structure with grouted holes and front blocking and back protection, and repeatedly and alternately grouting for multiple times until water burst is blocked; d, continuing grouting for a certain period of time after the water burst is blocked to guarantee that blocking is completed. By the arrangement, the cement-polyurethane composite grouting process is simple in procedures, capable of blocking water fast, and capable of integrating blocking and reinforcing.

Description

technical field [0001] The invention relates to the technical field of water blocking, in particular to a composite grouting process for rapid treatment of water-containing cracks, tunnels, water-rich areas, seepage and water gushing by using cement polyurethane. Background technique [0002] For the sealing and reinforcement of tunnels passing through water-bearing formations, groundwater seepage, water-bearing cracks and confined water, etc., grouting technology is a better choice. [0003] As a mature, economical and effective technical means, cement grouting is widely used in various aspects such as sealing leakage channels, filling cracks and strengthening rock mass, but in some cases, the expected effect cannot be achieved when relying on cement grouting, such , in the case of flowing water in rock and soil fissures, the cement slurry is usually diluted or washed away by water before consolidation; even if the cement slurry is modified by admixtures and accelerators, i...

AI Technical Summary

Problems solved by technology

However, this method of pre-mixing polyurethane and cement not only reduces the ability of polyurethane to block water, but also imperceptibly damages the inherent high-strength properties of cement slurry. There is also the problem of interfacial bonding, and the water plugging experiment also proves that the effect of this mixed grouting is not as good as that of alternate grouting. Alternate grouting can give full play to the respective advantages of polyurethane and cement