2results about How to "Guaranteed grouting effect" patented technology

The application belongs to the technical field of tunnel and underground engineering disaster prevention and control, and particularly relates to a cement-polyurethane composite grouting material suitable for dense soft rock reinforcement and a preparation method thereof. The composite grouting material is mainly formed by mixing a penetration cross-linking liquid and a grout vein skeleton liquid. The penetration cross-linking liquid is formed by mixing a grouting material A component and a grouting material B component. A semi-prepolymer is obtained by pre-polymerization reaction of a polyisocyanate and a polyether polyol, and then a diluent and a catalyst are added to the semi-prepolymer to obtain the grouting material A component; a surfactant, a retarder and water are mixed to obtain the grouting material B component; and cement and water are uniformly mixed in a certain proportion to obtain the grout vein skeleton liquid. The cement-polyurethane composite grouting material and the preparation method thereof can achieve penetration-splitting composite reinforcement effect when grouting in a dense soft rock poor geological section with strong density and poor permeability, and the grout preparation process and grouting operation steps are more simple and efficient.

This invention discloses an intelligent automated grouting method suitable for weak and fractured roof slabs in deeply buried highway tunnels, comprising the following steps: (1) During the excavation of the highway tunnel, a grouting main pipe system is deployed along the entire length of its sidewalls; (2) During the advancement of the tunnel face, hollow grouting anchor cables are installed in the weak and fractured roof slabs of the highway tunnel at a distance of 10-20m from the tunnel face, and the hollow grouting anchor cables are connected to the grouting main pipe for grouting; (3) During the advancement of the tunnel face, a monitoring and early warning instrument is quickly deployed in the weak and fractured roof slabs of the tunnel lagging behind the tunnel face; (4) When the grouting main pipe system receives an early warning signal, the weak and fractured roof slabs of the highway tunnel are automatically grouted. This invention can monitor the delamination amount of the weak and fractured roof slabs in real time, accurately grasp the grouting timing, ensure the grouting effect, significantly reduce the tedious and repetitive work of manual grouting, avoid incorrect judgment of the grouting timing, and improve the grouting efficiency of the weak and fractured roof slabs of highway tunnels.