5 results about "Crack closure" patented technology

This invention discloses an anti-seepage coating for drainage pipes and its preparation method, relating to the technical field of drainage pipe protection and repair materials. The anti-seepage coating comprises a polymer base, a cementitious substrate, hierarchical microcapsules, nano-reinforcing fillers, and a silane coupling agent. The polymer base includes shape memory polyurethane, and the hierarchical microcapsules have a double-shell structure with an inner and outer shell. The preparation process involves first preparing and modifying the hierarchical microcapsules, then preparing liquid and powder components separately and mixing them for application. The resulting coating is suitable for application on damp substrates and can achieve active crack closure, controlled release of healing agents, and enhanced interface stability under crack conditions, thereby improving the anti-seepage repair capability and long-term protective performance of drainage pipes.

The utility model relates to the technical field of assembly type precast beam, disclose a kind of assembly type precast beam, including main girder body and two wing plates, the main girder body top and bottom end are equipped with wing plate, the main girder body and the wing plate integrated forming, the main girder body axial both ends are all set up trapezoidal connecting groove, the position of the trapezoidal connecting groove of the inside wall of the main girder body is symmetrically installed with two groups of the inlet pipe, the other end of the inlet pipe is fixedly connected with connecting pipe, the top of the connecting pipe is fixedly connected with epoxy glue injection capsule, through the inlet pipe, connecting pipe and epoxy glue injection capsule being set, built-in high flowability epoxy resin, when node crack width is greater than or equal to 0.2mm, artificial trigger repair process is completed within 2 hours, crack closure rate is greater than or equal to 95%, compared with traditional grouting process efficiency is improved by 90%, avoid the structural performance degradation caused by crack propagation.

The application provides a synchronous method and system for CO2 displacement of coal bed gas based on electric detonation penetration and a sealing device, realizes collaborative and synchronous operation of electric detonation penetration and CO2 displacement, greatly shortens an operation cycle, reduces engineering cost, makes a crack network formed by electric detonation penetration be immediately and efficiently utilized, avoids CO2 injection difficulty caused by crack closure, and significantly improves technical collaboration effect; meanwhile, synchronous injection of CO2 can enhance diffusion capacity by using a transient negative pressure area generated by electric detonation, solves the problems of low injection efficiency and small sweep range of CO2 in low-permeability coal seams, realizes double targets of coal bed gas production increase and CO2 geological storage, and has dual benefits of energy and environmental protection. The application highly integrates penetration, displacement and sealing, forms a complete solution, reduces field operation complexity, and has good engineering application prospect.

The application discloses a kind of self-repairing material for underwater flow field sensing and its preparation method and application, belong to underwater sensing and intelligent material technical field.The application utilizes the self-repairing characteristics of PBS and the inherent conductivity of carbon nanotube and graphene, and prepares self-repairing self-pleated microstructure underwater flow field sensing surface by spraying-rolling method.When the surface is damaged, the continuity of PBS matrix is destroyed and accompanied by the fracture of local conductive network.In water environment or humid environment, water molecules can promote the reversible exchange and rearrangement of dynamic borate ester bond in PBS, so that the polymer chain segments at the fracture interface are reconnected and the network structure is restored, thereby accelerating the crack closure process.Meanwhile, the conductive channel composed of MWCNT / GNP gradually restores the conductivity and flow field response signal, so that the surface re-forms stable microtexture morphology, thereby realizing the continuous sensing and long-term service of flow field disturbance in underwater environment.