2results about How to "Solve the reinforcement problem" 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.

The utility model provides a municipal drainage pipeline groove support blank area reinforcing device, a supported groove is provided with an existing pipeline staggered with a newly-built pipeline, the supporting device comprises a plurality of fixing piles, enclosing purlins, a support, a supporting plate, a cross beam and slings, the fixing piles are inserted into the two sides of the groove side by side, the enclosing purlins are fixed on the fixing piles on the two sides of the blank area, and the supporting plate is fixed on the cross beam. The supports are fixed on the fixing piles and the surrounding purlins on the two sides of the blank area in a plane mode, the supporting plates are arranged between the supports and the side walls of the groove and used for surrounding the retaining wall, the cross beams are erected on the side walls of the two sides of the groove and located on the existing pipeline, and the slings are arranged on the cross beams and the existing pipeline in a sleeving mode and used for fixing the existing pipeline. The bracket is fixed on the fixed piles and the enclosing purlins and is matched with the supporting plate, so that the retaining wall can be effectively enclosed, and soil collapse is prevented; the cross beams are erected on the side walls of the two sides of the groove and located above the existing pipeline, the existing pipeline is fixed in cooperation with the slings, displacement and damage of the existing pipeline caused by soil disturbance in the construction process are avoided, and the safety of the existing pipeline is guaranteed.