83results about How to "Avoid catastrophic accidents" patented technology

The invention belongs to the technical field of waterproofing plugging of tunneling overexcavation gaps, and particularly relates to a shield burial method for receiving and plugging an overexcavation gap in high-water-pressure stratum. The invention solves the problem that the existing overexcavation gap waterproofing plugging technique is not suitable for high-water-pressure stratum, has high risk for shield receiving and can easily induce accidents. The method comprises the following steps: preserving a shield receiving well; breaking the wall of the shield receiving well to chisel out an annular groove, and laying freezing pipes in the annular groove; filling water into the shield receiving well, or filling water after filling soil; impelling the shield machine until only the shell of the shield tail is still in the entrance / exit ring of the tunnel; starting freezing, and injecting grout into the overexcavation gap; pumping water when the shield receiving well is isolated from the outside confined aquifer; and after pumping water to remove silt, cutting off part of the shield tail, and lifting out the disassembled shield machine, thereby completing receiving. The invention has the beneficial effects of ensuring that the shield can be received in the high-pressure fine sand layers and other severe strata, and preventing catastrophic accidents in shield receiving in unfavorable strata.

An in-line prediction and adaptive regulation equipment for surge of compressor system is composed of dynamic pressure sensor, DC power supply, pre-amplifier analog circuit, low-pass filter analog circuit, FFT analyzing DSP module, switch analog circuit, high-speed electromagnetic unit, integrator analog circuit, analog sawtooth wave output circuit, servo motor, inlet guide blade, microregulationvalve and high-speed exhaust valve. It can prevent the surge accident to improve stability of system.

The present invention discloses a composite material pressure container for holding liquefied gas, natural gas, liquid hydrogen and liquid oxygen etc. Said container includes internal container made up by high-strength alluminium alloy thin-wall inner liner or plastic thin-wall inner liner, its exterior is covered with a layer of composite material winding band layer which is made up by impregnating prestressed incidence-winded high-strength fibre with epoxy resin base composite material, and on the outer surface of the above-mentioned composite material layer several criss-cross communicated small grooves are cut, and its exterior is covered with closed external protecting layer with leakage-detecting holes which are communicated with above-mentioned small grooves and equipped with sensors mounted on these leakage-detecting holes.

The invention provides a double wire automatic submerged arc welding process. The process comprises the following steps of: cleaning and fixing weldments; setting a weld groove; setting parameters of the welding process; and adjusting the position of a welding gun to weld a welding connector. The improvements of the process include: the set parameters of the welding process comprise a pre-heating magnetic field exciting current, a pre-heating magnetic field exciting frequency, an electromagnetic stirring magnetic field exciting current, an electromagnetic stirring magnetic field exciting frequency, a thermal treatment magnetic field exciting current and a thermal treatment magnetic field exciting frequency; after the position of the welding gun is changed on the welding connector, a pre-heating exciting coil is started first to generate pre-heating magnetic fields to pre-heat the welding wire and the groove; when a double wire submerged arc welding gun makes arc strike weld on a run-on plate in front of the weld seam, the electromagnetic stirring exciting coil and the electromagnetic thermal treatment exciting coil are started to generate electromagnetic stirring magnetic fields and electromagnetic thermal treatment external magnetic fields; and when the double wire submerged arc welding gun reaches a run-off plate at the tail end of the weld seam, the welding gun extinguishes arc and is lifted, and at the same time, the power supply of the electromagnetic stirring exciting coil and the electromagnetic thermal treatment exciting coil is cut off, so that the weld is completed. The comprehensive mechanical properties of the welding connector are improved.

The invention discloses a sea area high-water-pressure shield method tunnel emergency tool change structure and a construction method. A shield tunneling machine is arranged below a freezing work platform, the freezing work platform and the shield tunneling machine are connected through a soil freezing curtain, the soil freezing curtain is composed of a front end vertical freezing structure and alower vertical freezing structure, a cutter disc is arranged on the end, facing the soil freezing curtain, of the shield tunneling machine, and the shield tunneling machine is provided with multiple shield pipe pieces. The construction method comprises the steps that the position of the shield tunneling machine is positioned, a sea freezing work platform is constructed, shield tunneling machine protection work is carried out in the shield tunneling machine, the front end vertical freezing structure and the lower vertical freezing structure are applied, positive freezing is carried out, and thefreezing effect is checked and verified; a repairing tunnel is excavated; a cutter disc cutter box is repaired in the repairing tunnel; and after repairing, a freezing pipe is pulled out. Emergency tool changing, cutter disc repairing and the like under the risk accident to the seabed shield tunnel can be achieved, the structural manner and the method process are simple, the construction risk islow, and the influence on the sea face is small.

The invention discloses a drilling tool internal thread rotary detection device based on the magnetic memory effect. The drilling tool internal thread rotary detection device based on the magnetic memory effect comprises a centering structure assembly and a rotary detection assembly, wherein the centering structure assembly can enable the axis of the rotary detection assembly to be coincide with the axis of a threaded hole of a detected drilling tool joint, thereby enabling a magnetic memory sensor in the rotary detection assembly to keep a constant lift-off value in rotation measurement when abutting against the detected internal thread surface. Therefore, the drilling tool internal thread rotary detection device based on the magnetic memory effect has the characteristics of high detection precision, simple and convenient operation and the like.

The present invention relates to a novel flexible composite shotcrete layer support material which comprises the following components in parts by weight: 80-100 parts of cement, 80-120 parts of sands, 100-120 parts of stones, 60-100 parts of rubber particles, 40-60 parts of coal ash, 20-30 parts of hooked end steel fibers, 50-80 parts of water, 6-7 parts of a crosslinking agent, 5-8 parts of an additive, 2-10 parts of polyamic acid resin with a solid content of 10%-25% and 3-5 parts of a 1% silane coupler solution. The prepared shotcrete layer material is greatly improved in compression strength, rupture strength and flexural toughness. The novel flexible composite shotcrete layer support material can be applied to the field of support to surrounding rocks of complex rock layers with characteristics of high stress, soft rock, expansion, flowing deformation, fault structure fracture zones, mining influence and the like or other dynamic pressure tunnel as well as the field of underground engineering of tunnels, subways and the like.

The invention discloses a device and a method for on-line detection of high-voltage switches, which helps to monitor the performances of compression springs of the high-voltage switches under causative conditions in real time, avoids disastrous accidents induced by spring yielding, and is favorable for grading the causative compression springs during the overhaul of the high-voltage switches so asto achieve on-line control on overhaul operation. The method comprises the following steps: (1) designing the complete-energy causativity of the compression springs, and tension or stress values of damage tolerance; (2) using a force measurement or stress sensor to detect the tension or stress of the compression springs under the causative conditions in real time; (3) allowing a system to automatically alarm or isolate high-voltage power grids when the tension or stress values detected in real time is lower than the damage tolerance; and (4) using the detection device to grade the causative compression springs when the high-voltage switches are overhauled and installing the compression springs of the same grade on the high-voltage switches of one high-voltage power grid. The invention hasthe advantage of improving the operation quality of the high-voltage power grids.

The invention relates to a solid anti-pricking tire and a manufacturing method thereof. The solid anti-pricking tire consists of gum filler, a tire cover, frameworks, a wheel spoke and a gum injection hole, wherein the frameworks with adequate number are distributed on the wheel spoke by taking the wheel spoke as a main body; the frameworks can be combined with the wheel spoke by means of welding, bolt connection and so on and then the tire cover is arranged; and after assembly is finished, the gum filler is injected through the gum injection hole. By utilization of the solid anti-pricking tire, tire fracture caused by road reason and so on and a series of disastrous accidents caused by the tire fracture can be avoided.

The invention discloses a self-adaptation sealing-type mechanical sealing device. A static sealing ring and a rotating sealing ring are arranged on the outer side of a rotating shaft in an axially opposite mode. The opposite axial end face of the static sealing ring and the opposite axial end face of the rotating sealing ring are sealing faces. The static sealing ring is arranged on a fixed structure through an anti-rotating structure and springs in a positioning mode, wherein the springs are arranged at intervals along the circumference of the static sealing ring. The rotating sealing ring is connected with a shaft sleeve of the rotating shaft in a transmission mode through a transmission structure. An elastic structure provided with axial elastic pushing force towards the directions of the sealing end faces is arranged between the rotating sealing ring and the shaft sleeve. Under a lower-pressure condition, the self-adaptation sealing-type mechanical sealing device a spring-static-type contact-type mechanical sealing device which is consistent with a normally-used type, and sealing with normal long service life operation under the lower-pressure condition can be effectively ensured. Under a high-pressure condition, a sealing type of the self-adaptation sealing-type mechanical sealing device can be changed along with pressures, and the self-adaptation sealing-type mechanical sealing device is automatically converted into a fluid-static-pressure-type mechanical sealing device, can bear high pressure in a better mode, ensures that the sealing is not damaged and effectively prevents disastrous accidents from happening.

The invention discloses a transmission tower damage recognition method, so as to solve the technical problem that the accuracy of recognizing the damage of a transmission tower structure by only depending on the vibration mode and the frequency of the transmission tower at present is not high, and the accuracy requirements for damage recognition of the transmission tower structure in engineering practice are hard to meet. The method comprises steps: the vibration modes before and after damages of multiple places of the transmission tower structure are acquired, and according to the vibration modes before and after damages of multiple places of the transmission tower structure, a vibration mode curvature difference before and after the damages of multiple places of the transmission tower structure is calculated; the vibration mode curvature difference before and after the damages of multiple places of the transmission tower structure is subjected to wavelet transform, a corresponding wavelet coefficient is acquired, and the information source of the vibration mode curvature difference before and after the damages of multiple places of the transmission tower structure in a wavelet domain is calculated and acquired according to the wavelet coefficient, wherein the information source are multidimensional vectors formed by change energy before and after the damages of multiple places of the transmission tower structure; and according to the information source, the damage possibilities of the multiple places of the transmission tower structure are solved respectively, and a damage recognition result of the transmission tower structure is acquired.

The invention discloses a gas burner for a pulverized coal boiler and a control method thereof. The gas burner comprises a burner, a first-level combustor and a burner control system and is characterized in that the burner comprises a combustion-supporting gas pipe, a hollow pipe, an air channel, a mixed gas pipe and a pulverized coal air pipe, wherein the hollow pipe is located in the axis direction of the burner; the air channel is communicated with the combustion-supporting gas pipe; the first-level combustor is connected with the front end of the pulverized coal air pipe; a natural gas pipe, a coal gas pipe and a gas mixing cavity are arranged at the rear end of the burner; the gas mixing cavity is connected with the natural gas pipe and the coal gas pipe; the burner control system is electrically connected with a combustion-supporting gas control device, a pulverized coal control device, a natural gas control device, a coal gas control device and a compressed air control device. The gas burner for the pulverized coal boiler has the beneficial effects of simple and reasonable structure, high and stable ignition efficiency, capability of preventing a burning wall from being lagged and eroded, zero oil, gas-saving effect and capability of efficiently avoiding disaster accidents.

The invention relates to a solid anti-pricking tire and a manufacturing method thereof. The solid anti-pricking tire consists of gum filler, a tire cover, frameworks, a wheel spoke and a gum injection hole, wherein the frameworks with adequate number are distributed on the wheel spoke by taking the wheel spoke as a main body; the frameworks can be combined with the wheel spoke by means of welding, bolt connection and so on and then the tire cover is arranged; and after assembly is finished, the gum filler is injected through the gum injection hole. By utilization of the solid anti-pricking tire, tire fracture caused by road reason and so on and a series of disastrous accidents caused by the tire fracture can be avoided.