7results about How to "Avoid secondary cracking" patented technology

The invention discloses a method for treating cracking of a power transmission tower foundation by reducing uplift force. The method comprises the following steps: building an uplift-resistant foundation; processing a connecting plate; a protective cap of the cracked foundation is dismantled; welding the connecting plate and the tower foot plate; installing a temporary stay wire for controlling the safety of the iron tower; the cracked concrete is removed; pouring and curing concrete at the cracking part; dismantling the temporary stay wire; and pouring a concrete protective cap. According to the method for treating power transmission tower foundation cracking by reducing the upward pulling force, the upward pulling force acting on the foundation is reduced, and cracked concrete is removed, so that the problem of foundation cracking is fundamentally solved.

This utility model relates to the field of road and bridge construction technology, and in particular to a fixing structure for repairing road and bridge cracks. It includes a cylinder and a road surface. A crack groove is provided at the crack in the road surface for placing the cylinder. A top groove is formed above the crack groove. A vertically placed support is slidably installed inside the cylinder. A waterproof plate is fixedly connected to the top of the support after it slides through the cylinder. An inner cavity is formed at the top of the cylinder. Connecting rods are rotatably connected to both sides of a section of the support located in the inner cavity. A pull rod is rotatably connected to the end of the connecting rod away from the support. A fixing rod is provided at the end of the pull rod away from the connecting rod. This application improves construction efficiency and reduces difficulty through convenient adjustment of the fixing structure. Furthermore, the design of barbs and waterproof grooves enhances structural stability and waterproof performance. The mechanical structure under stress also prevents further cracking, ensuring the quality of the repair work in terms of construction efficiency and long-term stability of the repair effect.

The invention relates to the technical field of automatic control or adjustment, and further relates to an efficient separation method for preparing an n-alkane phase change material from coal-based oil. The method comprises the following steps: 1, pretreating coal-based oil, decomposing components of the coal-based oil by utilizing a multi-stage pyrolysis reaction, and calculating the concentrations of various products; 2, inputting the concentration of each product into the optimization model; the optimization model optimizes the reaction temperature and the reaction pressure of the separation tower to obtain an optimized reaction temperature and an optimized reaction pressure; 3, based on the optimized reaction temperature and the optimized reaction pressure, solvent selection, extraction temperature and extraction pressure in the supercritical fluid extraction process are optimized, and the extraction efficiency is maximized. The separation conditions are optimized through the technologies such as the multi-stage pyrolytic reaction, the Langmuir adsorption model, the supercritical fluid extraction and the particle swarm optimization algorithm, the separation efficiency and the purity of the n-alkanes are improved, and the energy consumption is reduced.

The present application belongs to the technical field of metal material pressure processing, in particular to a hot rolling process method of wire rod for dual-phase steel welding wire, which comprises providing an electroslag remelted ingot with PREN value of 42±1; heating the ingot to 1200±10 DEG C and conducting 16 passes of blooming to obtain 120*120mm square billet with single pass reduction of ≤16%; adopting four-section step beam type heating furnace with soaking section temperature of 1180-1210 DEG C and holding time of ≥90min; closing the cooling water of rough rolling and intermediate rolling, adopting 1150 DEG C induction temperature compensation after the Φ76mm rough rolling outlet to make the core-surface temperature difference ≤20 DEG C; sequentially conducting 14 racks of intermediate rolling, 4 racks of pre-precision rolling, 8 racks of precision rolling and 4 racks of reducing diameter, with final rolling speed of 70-75m / s, precision rolling temperature of 1080-1120 DEG C and wire laying temperature of 1100-1180 DEG C; after the wire rod is coiled, cooling to below 550 DEG C at 0.8-1.0 DEG C / s on the delayed Stelmor line, with residence time above 550 DEG C of ≤35s; online solid solution treatment: by setting the process, the problem that the traditional hot rolling process is difficult to meet the temperature and deformation control is solved.

The invention provides a direct coal liquefaction system and a direct coal liquefaction method. The direct coal liquefaction system comprises a coal-oil slurry preparation unit, a preheating mixing unit, a first direct coal liquefaction reactor, a second direct coal liquefaction reactor, a third direct coal liquefaction reactor, a first separation unit, a distillation tower, a hydrogenation unit, a second separation unit and a hydrogen supply unit, the technical problems of coal powder deposition, mineral substance deposition, low utilization rate, poor operation stability, solid particle powder entrainment and the like of the reactor in the existing direct coal liquefaction technology are solved, and the bottleneck problem restricting further amplification of the reactor is solved, so that long-period efficient operation of the direct coal liquefaction device is realized; the utilization rate and the single-series scale of the direct coal liquefaction reactor are improved, the energy utilization efficiency is improved, and energy conservation and carbon reduction are facilitated.

The invention relates to the technical field of aero-engine turbine rear casings, in particular to a clamp tool and an inner runner crack repairing and deformation control method. The clamp tool comprises a supporting mechanism, an expansion mechanism, a pressing ring mechanism and a center shaft; the center shaft sequentially penetrates through the supporting mechanism, the expansion mechanism and the ring pressing mechanism. The expansion mechanism is arranged above the supporting mechanism, and the ring pressing mechanism is arranged above the expansion mechanism; the method comprises the steps of pre-welding treatment, deformation simulation of an inner runner workpiece, clamping of the inner runner workpiece, welding repair and post-welding quality and size inspection. According to the method, simplified simulation analysis is conducted on workpiece welding before welding, the deformation trend and the main deformation or residual stress area of the part are rapidly judged, the welding clamp tool is designed to achieve pre-deformation before welding and rigid fixing of the mounting edge, post-welding deformation can be effectively reduced, size out-of-tolerance is prevented, the rejection rate is reduced, and the repair cost is saved; and the post-weld heat treatment or vibration destressing procedure is omitted, the part machining time is shortened, and the repairing efficiency is improved.

The application discloses a kind of fair-faced concrete wall crack repair methods, comprising: preparation bonding slurry, the bonding slurry includes epoxy resin base fluid, curing agent and nano calcium powder filler;The bonding slurry is full irrigation in the crack of fair-faced concrete wall;Along the length direction of the crack, the accommodation groove is opened in the outer side of the fair-faced concrete wall, the position of the accommodation groove corresponds to the position of the crack;Lay anti-cracking mesh on the groove bottom of the accommodation groove, the opposite sides of the anti-cracking mesh are overlapped on the opposite sides of the crack;Fill the fine aggregate concrete layer in the accommodation groove, anti-cracking agent and anti-cracking fiber are mixed in the fine aggregate concrete layer;Coat elastic protective layer on the outer side of the fine aggregate concrete layer.The application solves the existing repair method of fair-faced concrete wall surface, and the problems that the repair effect is not durable and secondary cracking is prone to occur.