32results about How to "Ensure safe service" patented technology

The invention discloses a shape and position sensing method of a high-speed railway tunnel based on an embedded optical fiber, which comprises the following steps: pre-embed a temperature-sensitive optical cable along the longitudinal direction of the tunnel vault, and pre-embed a vibration sensor in the cement mortar protective layer outside the tunnel vault. Optical cables, pre-embedded fiber grating concrete strain gauges along the tunnel ring, connecting the optical fiber sensing elements to the demodulator and transmitting the sensing data to the server, analyzing the leakage, fire, abnormal intrusion, ring internal force of the tunnel and implementing Call the police. The present invention can sense and identify the occurrence time and location of events such as tunnel leakage, fire, and abnormal intrusion in real time and accurately, and can sense the inner force of the tunnel ring in the whole life cycle, which solves the problem that existing tunnel disease monitoring methods rely on It solves the problems of poor reliability and low data accuracy of the existing tunnel internal force monitoring system.

The invention relates to a method for rapidly repairing cement emulsified asphalt mortar interface connection damage of a unit slab ballastless track; the method mainly comprises the steps of cleaning, sealing, setting of grouting openings, interface connection damage grouting and edging treatment; the specific steps are as follows: firstly, cleaning dust and impurities around a mortar interface connection damage; secondly sealing the interface connection damage area, setting the grouting openings and placing a dial indicator at four corners of a track slab in a to-be-repaired area; thirdly, connecting a dual-component self-mixing grouting machine with a pressure grouting hose, and injecting a dual-component grouting material to the grouting openings in sequence; after the mortar comes out of a grouting opening having the spacing of more than the width of the track slab with the next grouting openings, turning to the next grouting opening to grout continuously till the whole cement emulsified asphalt mortar seam area is fully grouted; and finally, cutting the grouting hose, polishing sealed materials to finish the repairing. The method has the characteristics of simple and rapid process, high repairing efficiency and capability of realizing rapid repairing within skylight time and is applicable to repairing the cement emulsified asphalt mortar seams of the unit slab ballastless track.

The invention relates to the field of durability of reinforced concrete and aims to provide a marine experimental method of steel reinforcement cage built-in concrete. According to the method, a blocky concrete test piece is placed at a testing position of a sea tidal zone, and the concrete test piece is regularly detected; a steel reinforcement cage with a three-dimensional cage structure is built in the concrete test piece; the selected testing position of the sea tidal zone should have sea tidal action, that is to say, it is ensured that the time for the concrete test piece to be contacted with seawater within a day should be 8-16h. By selecting a sea tidal environment, a real work environment is provided for the test piece. By selecting the concrete test piece, safe service of the test piece in the testing process is guaranteed. By the built-in steel reinforcement cage, an internal material composition environment of reinforced concrete is more truly shown.

The invention discloses a regional overall treatment method for leaking water and cracks in open-cut tunnels of high-speed railways. The grout forms a new waterproof film; checks for water leakage after grouting; cuts off the exposed grouting nozzle and seals it. The present invention aims at the characteristics of high-speed railway open-cut tunnels, especially for complex tunnel situations where there are many leaking water cracks and a wide distribution range, and the sealing of one crack will easily cause the leakage of surrounding unplugged cracks. The high-strength high-speed railway open-cut tunnel leakage and crack regional overall treatment method adopts the whole section as a whole ring grouting, and the grouting holes are evenly arranged in each ring, which can realize uniform grouting at the vault, arch waist and side walls, etc. Through regional overall improvement, a new waterproof system will be formed to provide guarantee for the safe service of the tunnel structure.

The invention provides a turbine shaft-end seal device applied to a Kalina power circulating system. The device comprises a spiral seal system and a water seal system, wherein the spiral seal system comprises a spiral shaft sleeve, a stationary sleeve, a leak collecting cavity, a seal cavity and a mechanical seal; the spiral shaft sleeve is embedded onto the main shaft of a Kalina power circulating turbine, the stationary sleeve and the spiral shaft sleeve are arranged in a spaced manner at the same end of the main shaft in a sleeving manner to form the spiral seal, the seal end of the stationary shaft and the end part of the main shaft form a sealed cavity, the open end of the stationary sleeve and the main shaft form a cavity as the leak collecting cavity, and the mechanical seal arranged between the stationary sleeve and the main shaft is located in the leak collecting cavity; when the main shaft rotates, the spiral shaft sleeve rotates to pressurize the seal cavity; the water sealsystem comprises a pressurizing pump, an adjusting valve and a water tank; the input end of the water tank communicates to the leak collecting cavity while the output end of the water tank communicates to the tail end of the gap between he spiral shaft sleeve and the stationary sleeve successively through a pressurizing pump and the adjusting valve. Through three seals: the mechanical seal, the water seal and the spiral seal, the problem of corrosion caused by contact of ammonia-enriched steam and the mechanical structure is avoided.

The invention provides a mechanical structure accumulative fatigue damage monitoring sensor, a design method and a monitoring method under the normal load distribution law, and belongs to the technical field of structural fatigue monitoring. The mounting feet of the fatigue damage monitoring sensor are used to withstand the stress on the surface of the mechanical structure, and the average strain of the surface of the measured structure covered by the stretching arm is amplified by different magnifications through two strain amplification bridges to ensure the effective strain amplitude of the fatigue life foil Work within the scope; through the structural cumulative fatigue damage monitoring model, when the structure is in service under the load that obeys the normal distribution law, the cumulative fatigue damage of the mechanical structure can be obtained according to the cumulative resistance of the double fatigue life foil to ensure the safety of mechanical parts Serve to prevent accidents from happening.

The invention relates to a rapid repairing material of a seam between CRTS II shaping plate ballastless track boards. The material comprises, by mass, 100 parts of cement, 16-48 parts of fly ash, 3-9 parts of ultrafine slag powder, 1-3 parts of silica fume, 40-110 parts of fine aggregates, 6-12 parts of a slight expansion component, 1-8 parts of a polymerization bonding component, 1-10 parts of a modulus adjusting component, 0.01-2 parts of a powder antifoaming agent, 0.5-5 parts of a hardening acceleration component and 0.2-1 part of a water reduction component. The material has the characteristics of simple workability, high bonding strength, high strength, rapid setting, low modulus and high durability, is suitable for rapidly repairing the seam between CRTS II shaping plate ballastless track boards, and is also suitable for rapidly repairing other similar structures.

The invention discloses a component structure reliability topology optimization design method considering bounded mixed uncertainty. It includes the following steps: considering the uncertainty in the manufacturing service of the part structure, describing the external load with insufficient samples and the material properties with sufficient samples as interval variables and bounded probability variables respectively; discretizing the part structure design domain, setting the physical and geometric Constraints, establish a reliability topology optimization design model. Using the moving asymptote method to solve: decoupling probability interval uncertainty, using constraint performance gradient to determine the worst working condition; defining worst working condition performance fluctuations to calculate constraint performance reliability; finally calculating the gradient of the target and constraint functions to the design variables for iteration. The optimal design model established by the invention truly reflects the distribution characteristics of the multi-source uncertainty of the part structure, is efficient in solving, and has good engineering application value.

The invention provides an FTA-based method for testing and analyzing aircraft severe weather environment faults, belonging to the technical field of aircraft testing. Including the following steps: S1, determine the flight accident caused by the bad weather environment as a fault tree top event; S2, carry out statistical analysis on the accident and the accident symptoms related to the weather factor; S3, analyze the set of bad weather factors that cause the aircraft accident and construct the fault tree; S4, construct a failure risk model of the aircraft in severe weather environment; S5, predict the importance of the risk of adverse weather factors affecting flight safety. The invention solves the problem that the prior art lacks the failure analysis method for the aircraft's harsh climate environment, which is not conducive to the design of the aircraft climate test in the climate environment laboratory of the whole aircraft, and has the advantages of simple operation and strong applicability.