13 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 invention relates to a device and method for evaluating the crack healing capacity of a memory alloy fiber cement-based material, and belongs to the field of concrete crack healing, the device comprises a partition manufacturing mold and a crack prefabricating device, the partition manufacturing mold is used for manufacturing a low-melting-point alloy partition, and the partition size is consistent with the crack size of the cement-based material; the crack simulator is used for simulating cracks of cement-based materials; the crack prefabricating device comprises a test mold, a steel support and a steel clamp. A plurality of cement-based material pouring areas are arranged on the test mold; the multiple steel clamps are arranged on the steel support, located over the cement-based material pouring area and used for fixing the partition, and a plurality of memory alloy fibers are prefabricated on the partition. The crack healing capability is comprehensively evaluated by taking the crack closing rate as a main part and taking the shrinkage deformation utilization rate as an auxiliary part. According to the method, accurate control over the crack size, the fiber distribution direction at the crack and the length of the fiber unbonded area can be achieved, and reasonable evaluation on the crack healing capacity can be achieved.

The present application relates to the technical field of material performance testing, and is a kind of abrasion resistance testing device and evaluation method for granular support material and plugging material, the former includes test support, test platform, support body, grinding ring, driving mechanism and lifting assembly, the lower part of test support is provided with lifting assembly capable of moving test platform up and down, and the upper side of test platform is provided with columnar support body.The abrasion resistance testing device for granular support material and plugging material in the present application can test the abrasion characteristics of granular material to be tested under the conditions of downhole drill pipe grinding, liquid impact or crack closure pressure, the abrasion resistance testing device for granular support material and plugging material uses the friction-grinding process between the metal surface and the granular material to replace the energy of high-speed fluid erosion and physical contact shear wear in downhole, and realizes the collection and statistics of the material to be tested through the grinding groove, which significantly improves the accuracy of wear quantification.

The invention discloses an angle-adjustable nondestructive flaw detection method and system for a concrete dam crack, relates to the technical field of crack detection, and is used for solving the problem that the acoustic impedance difference at a crack interface is reduced. The method comprises the following steps: judging the closure degree of a crack, screening and marking divided sections based on a crack closure state, screening out the divided sections with acoustic transparency risks, further adjusting an incidence deflection angle of an ultrasonic probe in combination with stress direction information of the crack, and changing a sound wave incidence direction so as to excite echo response. The acoustic transparent state of a crack closed interface is destroyed, the angle compensation effect is verified through contrastive analysis of echo characteristics of longitudinal waves and transverse waves, a closed-loop nondestructive flaw detection process is formed, and reliable detection of hidden cracks under the high-water-level condition is achieved on the premise that the structure of a dam body is not destroyed.

The invention provides recycled aggregate-based microorganism self-repairing low-heat ship lock concrete and a preparation method thereof, and belongs to the technical field of hydraulic engineering concrete materials. The recycled aggregate-based microbial self-repairing low-heat ship lock concrete comprises the following components: a cementing material, wherein the cementing material comprises low-heat slag cement and phosphorus slag powder; regenerating the coarse aggregate; natural coarse aggregate; manufacturing sand; the microbial capsule takes bacillus pasteurii as a functional strain, and the mixing amount of the microbial capsule is 2.5%-3.5% of the total mass of the cementing material; the invention relates to a polycarboxylic acid composite retarder. The highest temperature rise in the concrete prepared by the technical scheme is less than or equal to 55 DEG C, and temperature cracks are effectively inhibited; the 28d closing rate of a 0.1-0.5 mm crack is greater than or equal to 90%, and the strength recovery rate after repair is greater than or equal to 85 The method is suitable for ship locks and other mass concrete projects, and the problems that in the prior art, the function is single, the solid waste utilization rate is low, and temperature control and self-repairing cooperation is insufficient are solved.

The invention discloses a finite element simulation method for initial layering damage fatigue extension of a composite T-shaped stiffened plate structure. The method comprises the steps that ABAQUS is adopted to establish a finite element model of the composite T-shaped stiffened plate structure containing initial layering; according to the method, ABAQUS is subjected to secondary development, a UMIXMODEFATIGUE subprogram is compiled based on a virtual crack closure (VCCT) technology, a BK criterion is selected as a mixed mode criterion, and a Paris criterion is selected as a damage fatigue extension criterion; the subprogram is called, the finite element model of the composite T-shaped stiffened plate structure is calculated, and simulation analysis of initial layering damage fatigue extension of the composite T-shaped stiffened plate structure is achieved. According to the method, the evolution path, the expansion rate and the damage morphology of the initial layering damage of the rib-skin interface of the composite T-shaped stiffened plate structure under the fatigue load can be simulated, and the method has great engineering value.

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.

This invention discloses a non-destructive testing method and system for concrete dam cracks with adjustable angles, belonging to the field of crack detection technology. It addresses the problem of reduced acoustic impedance differences at crack interfaces by dividing the dam body under test into sections and incorporating the detection of water level depth and P-wave echo characteristics to determine the degree of crack closure. Based on the crack closure state, sections are screened and marked, identifying sections with potential acoustic transparency risks. Furthermore, by combining the crack's stress direction information, the incident deflection angle of the ultrasonic probe is adjusted to change the sound wave incident direction and excite the echo response, thereby disrupting the acoustic transparency of the crack closure interface. The angle compensation effect is verified through comparative analysis of P-wave and S-wave echo characteristics, forming a closed-loop non-destructive testing process. This enables reliable detection of hidden cracks under high water levels without damaging the dam structure.

The application provides a large-depth nano gradient structure hydrogen embrittlement resistant material and a preparation method and device thereof, laser shock peening and ultrasonic peening are simultaneously used to strengthen the upper surface of a stainless steel sheet, when the upper surface of the stainless steel sheet is shocked by laser, the ultrasonic peening pin applies ultrasonic peening, interaction is generated by using ultrasonic multiple uniform peening and laser single or multiple high strain rate peening, and a large-depth gradient nano heterogeneous structure and residual compressive stress distribution are formed on the surface of the stainless steel sheet. In the micro scale, hydrogen atom invasion is hindered by the refined nano layer, hydrogen atom diffusion is inhibited by hydrogen capturing effect of fine grain boundaries and dislocations, hydrogen induced plastic loss and hydrogen induced cracking caused by hydrogen atom enrichment in a local area are avoided, in the macro scale, the crack initiation threshold is improved by introducing high amplitude residual compressive stress, and the initiation and expansion of hydrogen induced cracks are inhibited by using the crack closure effect, so that the hydrogen embrittlement resistance of the stainless steel is effectively improved.

The invention discloses a concrete crack self-repairing intelligent grouting system and method based on MICP, the crack width, depth, expansion rate and microorganism survival environment parameters are collected in real time through a sensing unit, an intelligent control unit repairs a kinetic model according to the trained MICP, the grouting pressure, the ratio of a microbial agent to a nutrient solution and the single dose are dynamically adjusted, and the concrete crack self-repairing intelligent grouting system and method based on the MICP are obtained. The MICP reaction uniformity can be ensured, and the crack repairing effect is greatly improved; key indexes such as the calcium carbonate precipitation amount and the crack closure degree are detected in real time in the repairing process, a closed-loop system is formed, the repairing quality is accurately evaluated, and the risk that secondary expansion of cracks is not found in time is avoided; by continuously regulating and controlling parameters such as pH value and temperature, the activity of the microbial inoculum is maintained at a relatively high level, and the calcium carbonate precipitation efficiency is improved; and the data storage and cloud analysis unit performs storage and long-term tracking on the repair whole process data, so that the whole life cycle management of the concrete structure from repair to long-term maintenance is realized.

The application provides a planar beam body anchoring system and a construction method thereof. The anchoring system comprises a steel wire mesh and a tensioning device. The steel wire mesh is attached to a beam body reinforcing surface. Two ends of the steel wire mesh are a fixed end and a tensioning end, or both ends of the steel wire mesh are tensioning ends. The fixed end is fixedly connected to the beam body reinforcing surface through a bonding material. The tensioning device is detachably connected to the beam body reinforcing surface. A tensioning output end of the tensioning device is fixedly connected to the tensioning end of the steel wire mesh, and is used for applying a tensioning prestress to the steel wire mesh. The steel wire mesh is fixedly connected to the beam body reinforcing surface through a bonding material layer. The planar beam body anchoring system and the construction method thereof can improve the deflection load of the planar beam body, avoid cracking and damage of the planar beam body, promote crack closure of the cracked planar beam body, prolong the safe service life of the planar beam body, and improve the reinforcing effect.