389results about How to "Safe and reliable structure" patented technology

The invention discloses a design method of an ultra-large-span tide gate with a self-stabilizing structure. The tide gate comprises gate foundations arranged on the two sides of a riverway estuary, and each gate foundation is provided with an arc-shaped guide groove and a spherical supporting hinge; the spherical trunnions are connected with one ends of the water retaining gates, the other ends of the water retaining gates make contact with each other to be in a closed state when storm surge comes, and the closing point of the water retaining gates is located on the open sea side of the connecting line of the two spherical trunnions. An arc-shaped stability maintaining piece matched with the arc-shaped guide groove is arranged in the arc-shaped guide groove, one end of the arc-shaped stability maintaining piece is fixedly connected with the water retaining gate, and the other end of the arc-shaped stability maintaining piece is connected with the hoist. Navigation and the hydrological river regime of the original river channel are not affected in the processes of structural design, manufacturing, processing, transportation, installation, overhaul and maintenance and the like, and the influence on the original river channel can be reduced to the maximum extent.

The invention belongs to the field of bridge construction foundation construction, and particularly relates to a combined cofferdam suitable for a deep-buried bridge bearing platform foundation and a construction method. The combined cofferdam comprises a lower concrete cofferdam and an upper locking steel pipe pile cofferdam, and an air curtain structure for assisting the cofferdam in sinking is arranged in the combined cofferdam; a U-shaped groove is formed in the top of the concrete cofferdam, the bottoms of all the fore shaft steel pipe piles of the fore shaft steel pipe pile cofferdam are inserted into the U-shaped groove, and the whole combined cofferdam structure is more reasonable in stress and safe and reliable in structure. The construction method comprises the steps that a lock catch steel pipe pile cofferdam is installed on a concrete cofferdam through a crane, water is injected into an air curtain and lock opening steel pipe piles for ballasting to assist sinking, and finally after construction of a bridge bearing platform, a pier body and the like is completed, the lock opening steel pipe pile cofferdam is pulled out one by one through a vibration pile driver. According to the construction method, the installation speed is high, the installation precision is easy to control, operation is easy, the construction difficulty is effectively reduced, and the construction efficiency is improved.

The invention discloses a rusted high-strength bolt connection pretightening force intelligent self-optimization prediction method and system, and belongs to the technical field of bolt pretightening force detection.The method specifically comprises the steps that a finite element database of bolt connection pretightening force loss is established, and a machine learning prediction model based on a neural network is trained; when the recognition accuracy of the machine learning prediction model reaches a preset value, pre-tightening force loss of the target bolt is monitored in real time, and real-time geometric feature information of connection of the target bolt is obtained; when the similarity between the real-time geometric feature information of the target bolt connection and a finite element model in the finite element database is greater than or equal to a preset value, calling the pre-tightening force loss of the existing finite element database; when the similarity is lower than a preset value, the trained machine learning prediction model is utilized to output actual bolt connection pre-tightening force loss in real time; the bolt looseness detection device realizes automatic and marker-free bolt looseness detection, is high in bolt image acquisition angle and distance tolerance, and can meet bolt looseness detection at different positions.

The invention relates to the technical field of railway tunnels, in particular to a surrounding rock steel arch support construction method, after a tunnel is excavated, a steel arch is annularly spliced and installed along the section of the tunnel, primary support is carried out, the steel arch is formed by splicing and connecting steel arch sections, and each steel arch section is composed of a profile steel arch section and a flexible expansion pipe; the section steel arch frame sections are circular-arc-shaped section steel arch frame sections with openings in the upper portions, the flexible expansion pipes are embedded in the circular-arc-shaped steel arch frame sections, the flexible expansion pipes are filled with filling materials, and the flexible expansion pipes are extruded through the filling materials till the flexible expansion pipes are tightly attached to the inner walls of the circular-arc-shaped section steel arch frame sections. A first buffer layer is further arranged between the flexible expansion pipe and the arc-shaped steel arch frame section, and the first buffer layer is an elastic rubber plate arranged on the inner side of the arc-shaped steel arch frame section. According to the method, the primary support is more stable and firmer, the supporting force is higher, certain toughness and buffering force are achieved, and on the basis that the supporting strength is guaranteed, the support is not prone to breakage.

The invention discloses a self-resetting energy dissipation and shock absorption steel frame with flexible supports and an assembly method. The self-resetting structure gradually becomes a research hot spot, so that the structure can be quickly recovered after an earthquake, and the overhaul of the structure is reduced. The device comprises an I-shaped steel column which is vertically arranged, wherein the I-shaped steel column comprises two I-shaped steel side columns and an I-shaped steel middle column; a steel beam is horizontally arranged between the I-shaped steel columns, and the I-shaped steel columns and the steel beam are connected through sliding friction type beam column joints. The lower parts of the I-shaped steel side columns and the middle parts of the I-shaped steel middle columns are connected with supporting sections; the bottom of the I-shaped steel middle column is connected with a column foot. In the swinging process, the deformation range of the frame can be controlled, and the self-resetting function is achieved, so that safety and reliability are achieved; all the components are prefabricated components, and assembling and construction are easy.

The utility model provides an existing urban rail bridge high pier backfill protection structure which comprises a pile casing body, a pile casing group pile foundation and a pile casing top cover plate, the pile casing group pile foundation comprises a plurality of stand columns annularly arranged around an existing pier, a pile casing bearing platform is arranged at the top ends of the stand columns, the pile casing body is arranged on the pile casing bearing platform, and the pile casing body is arranged on the pile casing bearing platform. The pile casing body is arranged on the outer side of an existing pier in a sleeving mode, a gap is reserved between the inner wall of the pile casing and the outer wall of the existing pier, a backfilling layer is arranged in the gap, and a pile casing top cover plate is arranged at the top end of the pile casing. The backfill pressure and the construction load are dispersed outside the existing bridge structure, it is guaranteed that an original bridge stress system does not change, and under the condition of quality safety and economic reasonability, it is guaranteed that the existing bridge structure is safe and reliable in the whole process.

The invention discloses a tunnel anchor cable damage intelligent detection and early warning system, and belongs to the technical field of multi-source data detection, a multi-source data acquisition module detects the strain degree of an anchor cable through a wireless resistance strain gauge, and detects the wall thickness of the anchor cable through a wireless ultrasonic emission sheet; data collected by the wireless resistance strain gauge and the wireless ultrasonic transmitting sheet are transmitted to the wireless sensor, in the wireless sensor, received resistance change signals and ultrasonic signals are amplified and filtered, the signals are converted into digital signals through an analog-to-digital converter, the data are compressed, and the compressed data are transmitted to the wireless sensor. Then the data is transmitted to a data analysis and early warning module; and the data analysis and early warning module is used for predicting the residual life of the anchor cable and evaluating the risk level according to the processing results of the two different data, and carrying out early warning after a preset value is reached. The wireless anchor cable detection device is high in precision, low in cost and high in practicability and does not damage the anchor cable.

The invention relates to the technical field of compressed air energy storage, in particular to a compressed air energy storage artificial cavern structure under the local soft rock stratum condition and a construction method. A plurality of pipelines are arranged in the soft rock cavern, and the two ends of the pipelines are connected with the steel linings in the hard rock cavern in a sealed mode through the end sealing plates, so that the sealing performance and the gas circulation performance of the gas storage cavern are guaranteed; the high internal pressure is mainly borne by the steel pipe, and the small-proportion internal pressure transmits the internal pressure of the pipeline to surrounding rock through concrete between the pipelines. Compared with a steel lining in a hard rock cavern, a plurality of steel pipes with smaller diameters are arranged in the soft rock cavern, so that the internal pressure load sharing rate of soft surrounding rock is favorably reduced, the deformation of the surrounding rock is reduced, and the structural safety is ensured. According to the scheme, a new design concept is provided for application of the compressed air underground gas storage cavern structure under the condition of the local soft rock stratum, and the flexibility of site selection is improved.

The invention provides an intravenous radio frequency closed catheter control system, and relates to the technical field of medical instruments, the system comprises a main control unit, and a communication module, an impedance control module, a display screen, a key module and an auxiliary power supply which are electrically connected with the main control unit, the main control unit is used for outputting an impedance control signal to the impedance control module through the communication module according to a key signal, the display screen is used for displaying the working state of the multi-section catheter coil, and the auxiliary power supply is used for supplying power to the impedance control circuit, the communication module, the display screen and the button module. And the impedance control module controls the switching of the working impedance of the multi-section catheter coil according to the control signal so as to control the radio frequency closed catheter in the venous cavity. Accurate switching control and combination of the multi-section catheter coil can be achieved, clinical diversity requirements and operator skill diversification are met, and the vein closing effect is improved.

A pre-constraint block column comprises a block, a constraint cage, a polymer and a column steel bar. The constraint cage comprises a cage frame and constraint cage holes; the block material is arranged in the constraint cage to form a pre-constraint block material; the column reinforcements comprise column longitudinal reinforcements and column transverse reinforcements; the column transverse reinforcements are arranged at intervals along the column longitudinal reinforcements to form a column reinforcement cage; the pre-constraint block material is surrounded by the column reinforcement cage; the polymer fills the gaps in the pre-confinement block; the polymer wraps the column reinforcement cage and fills a gap between the pre-constraint block and the column reinforcement cage; and polymers are arranged at the holes of the restraint cage, so that the polymers in the restraint cage and the polymers outside the restraint cage are connected into a whole. According to the utility model, the block and the polymer are arranged in the constraint cage to form a pre-constraint block polymer, so that excessive crushing of the block is reduced, and energy consumption and pollution are reduced; the combined action of the block and the polymer is enhanced, and the bearing capacity and ductility of the pre-restrained block column are improved.

The utility model discloses a pre-constraint block steel pipe column and structure. The pre-constraint block steel pipe column comprises a pre-constraint block, concrete, a column steel pipe and transverse stiffeners, the pre-constraint block material comprises a block material and a constraint cage; the block material is arranged in the constraint cage; the constraint cage comprises a cage frame and constraint cage holes; the pre-constraint block material is surrounded by the column steel pipe; the concrete wraps the pre-constraint block material and fills a gap between the pre-constraint block material and the column steel pipe; the transverse stiffener is a steel member and is fixedly connected with the column steel pipe; and the transverse stiffener is arranged corresponding to the horizontal member to be mounted. According to the utility model, the block in the constraint cage and the concrete form the pre-constraint block concrete, so that the excessive crushing of the block is reduced, and the energy consumption and pollution are reduced; through the combined action of the block and the concrete, the bearing capacity and ductility of the pre-restrained block steel pipe column are improved.

The invention discloses an aero-engine core engine rotor press-fitting assembly device which comprises a supporting rod, a mounting base, a pull rod and an upper pressing plate which are sequentially arranged from top to bottom, a lower base is further arranged in the center of the top face of the mounting base, and connecting blocks are evenly arranged on the top face of the mounting base around the lower base. The bottom of the connecting block downwards penetrates through the mounting base and is connected with an actuating cylinder arranged at the bottom of the mounting base, the bottom of the pull rod is connected with the connecting block, a pull rod connecting clamping groove is formed in the position, right opposite to the pull rod, of the edge of the upper pressing plate, and a pressure sensor and an electronic display screen are further arranged on the top face of the lower base. The pressure sensor is located between the rotor and the lower base and is in electric signal connection with the electronic display screen. The problems that when a high-pressure compressor rotor and a high-pressure turbine rotor are assembled, due to interference of interference spigots and warping of installation edges, the rotors cannot be tightly attached, rotor assembly jumping is unqualified, and a main machine vibrates are solved.

The utility model discloses a quick plugging suite in the field of connectors, which comprises a module end plug and a plurality of detection end plugs, and each detection end plug is provided with a different number of connection ports; the plurality of detection end plugs are connected with the module end plugs in a matching manner; wherein the module end plug and each detection end plug can be plugged and fixed, a lock catch is arranged on the module end plug, a locking piece is arranged on each detection end plug, the module end plug and the detection end plug are fixed, and the lock catch is matched with the locking piece to be used for retaining the module end plug and the detection end plug; the detection end plug is matched with the plurality of module end plugs, a single detection end plug can be fixedly installed with the plurality of module end plugs, signal access of detection devices of different wiring systems to the PLC analog quantity input module can be met, program modification and wire changing are not needed when different types of detection devices are replaced, and the detection efficiency is improved. And the misoperation risk in the equipment maintenance working process is reduced.

The utility model relates to the technical field of building decoration, in particular to a damping and noise-reducing supporting structure for an indoor floor rostrum / stage. The structure comprises a keel, a reinforced fiber cement board located on the keel, a surface layer material laid on the reinforced fiber cement board and stand columns supporting the keel to form a three-dimensional frame structure, and rubber filler strips are arranged between the keel and the reinforced fiber cement board. The stand columns are fixed to a building / ground through steel plates, rubber cushion blocks are arranged between the steel plates and the building / ground, and the steel plates and the rubber cushion blocks are fixed to the building / ground through expansion bolts. By arranging the rubber filler strips and the rubber cushion blocks, a double-damping and noise-reducing structure is formed, a sound bridge is blocked, and the structure is safe, convenient to construct, low in manufacturing cost and high in adaptability.

The utility model discloses a concrete faced rockfill dam body reverse drainage pipe plugging structure which comprises a toe board, a water collecting structure arranged on the downstream portion of the toe board and a first pipe pre-buried in the toe board and extending into the water collecting structure, the toe board is filled with a blanket, one end of the first pipe is connected with a second pipe, and the other end of the first pipe is connected with the second pipe. The second pipe extends towards the upstream slope surface of the toe board, a plurality of drainage valves are arranged on the second pipe at intervals, and concrete is poured on the periphery of the second pipe. According to the utility model, the first pipe is connected to the upstream slope surface of the toe board through the second pipe, and meanwhile, the second pipe can synchronously ascend with the blanket in the construction process, so that water in the dam can be smoothly discharged in the blanket filling process, and the jacking damage of a panel in the blanket construction process can be avoided.

The invention discloses a fully automatic clothes drying rack device for rainy day recycling. It comprises a clothes drying rack body, an indoor part and an outdoor part; the indoor part comprises a rhombus scissor rack, a mobile platform and a fixing device, the top of the rhombus scissor rack and the fixing device are fixed to the roof, the clothes drying rack body can be selectively connected to the rhombus scissor rack and the mobile platform, the mobile platform is installed and connected to the bottom of the fixing device and moves horizontally under the drive of the fixing device; the outdoor part comprises two groups of connecting rod joints, the butt joints are installed on a multi-link mechanism, the multi-link mechanism is fixedly installed on the outdoor vertical surface, the butt joints are driven by the multi-link mechanism to rise and fall, and simultaneously move to the horizontal side of the fixing device close to the indoor part. The invention can realize indoor and outdoor clothes drying, which are independent of each other, can achieve indoor and outdoor clothes drying without affecting other indoor appliances, and avoid clothes getting wet, and has the characteristics of small size, exquisite structure, safety and reliability, convenient use, convenient installation and maintenance, and low cost.

The utility model relates to the technical field of low-voltage power distribution, and discloses a low-voltage power distribution circuit and a power distribution box for uninterruptible power maintenance, the circuit comprises a main incoming line switch circuit breaker, a main busbar, a plurality of branch switch circuit breakers with different rated currents, a zero line busbar and a ground wire busbar; the main incoming line switch circuit breaker is electrically connected to a low-voltage power supply system, the main busbar is electrically connected to the main incoming line switch circuit breaker, the plurality of branch switch circuit breakers are electrically connected to the main busbar, a zero line access end of each branch switch circuit breaker is connected with the zero line busbar, a ground line access end of each branch switch circuit breaker is connected with the ground line busbar, and the main incoming line switch circuit breaker is electrically connected with the main busbar. The confluence end of the zero line busbar is connected with a zero line of the low-voltage power supply system, and the confluence end of the ground line busbar is connected with a ground line of the low-voltage power supply system. Compared with the prior art, the circuit provided by the utility model can directly select the output mode of the corresponding output unit to adjust the impedance load or replace the shunt without interrupting the total power, and is safe and reliable in structure and convenient to operate.

The present invention discloses an assembled revetment, including a pile foundation inserted into the soil, a pile head is provided on the top of the pile foundation, a groove is provided on the side of the pile head, a corbel is provided on the bottom of the pile head, an opening matched with the pile head is provided on a prefabricated bottom plate, a vertical baffle extending upward is provided on one side of the prefabricated bottom plate, a lower vertical plate extending downward is provided on the other side of the prefabricated bottom plate, the prefabricated bottom plate is placed horizontally, a reserved opening passes through the pile foundation, the lower vertical plate is inserted into the soil close to the pile foundation, the prefabricated bottom plate is framed on the corbel of the pile foundation, the pile head extends above the prefabricated bottom plate, fasteners are installed at the groove positions on both sides of the pile head, the fastener tenons are tightly fitted with the grooves on the side of the pile head, the bottom of the fastener is against the bottom plate, the pile head kit is sleeved on the periphery of the pile head and the fastener, so that the three form a whole, and the pile head is locked on the bottom plate. The assembled revetment structure of the present invention is reliable, the components can be orderly dismantled according to demand, no waste concrete is left in the soil body, and the impact on the ecology is reduced.

The utility model relates to the technical field of water pumps, in particular to an integrated self-suction double pump which comprises a top cover, a water inlet and outlet housing, a suction cup assembly and a driving mechanism. The top cover covers the front port of the water inlet and outlet housing, and a water inlet and at least two water outlets are formed in the top cover; a water inlet space and at least two water outlet spaces are arranged in the water inlet and outlet housing; the suction cup assembly is installed at the rear end of the water inlet and outlet housing, suction force is provided for water flow in the water inlet space through deformation, the suction cup assembly pushes sucked water into the water outlet space through deformation, and then the water is pushed out through the water outlet. The driving mechanism is connected with the suction cup assembly and used for providing power for the suction cup assembly so as to extrude the suction cup assembly to deform the suction cup assembly, the double pump with the multiple water outlets is designed, water outlet of each water outlet can be independently controlled to be opened and closed, the structure is simple, and production and assembly are easy.

The invention provides a construction method of an offshore fixed storage device. The construction method comprises the steps that a cylindrical storage device is machined and manufactured in a steel structure factory; shipping and transporting to a construction sea area; the floating crane lifts and turns over the storage device; the floating crane is matched with the vibratory hammer to insert and beat the cylindrical storage device to a stable seabed; mud is sucked in the material storage device, and impurities are cleaned; leaking stoppage bottom sealing concrete in the material storage device is poured; and finally, a storage device vertical ladder stand, a top opening operation platform and a top opening sealing cover plate are installed. The material storage device can be quickly constructed and fixed under the condition of a complex sea area, the investment of construction equipment and resources is small, the efficiency is high, and the construction cost can be reduced. The storage device is filled with leaking stoppage concrete, it is ensured that a waterproof storage space is formed between the structure and an external sea area, the structure is safe, and the device can be used for civil air defense engineering under special conditions.

The utility model discloses a prefabricated truss concrete structure assembly type fence and sound insulation wall. The prefabricated truss concrete structure assembly type fence and sound insulation wall comprises a plurality of truss concrete wall column units prefabricated in a factory and a plurality of truss concrete wall plate units prefabricated in the factory and arranged between the adjacent truss concrete wall column units. Each truss concrete wall plate unit comprises a concrete plate and a plurality of connecting plates I, a plurality of sound insulation quantity reduction holes are formed in each unit at intervals, and the upper end and the lower end of each truss concrete wall plate unit are further provided with a water retaining upper rabbet and a water flooding lower rabbet respectively. A wallboard steel truss and an anti-crack steel mesh are arranged in the concrete slab, and the connecting plate I is installed on the wallboard steel truss. The truss concrete wall column unit comprises a concrete column and a plurality of connecting plates II, a wall column steel truss and an anti-crack steel mesh are arranged in the concrete column, and the connecting plates II are mounted on the wall column steel truss. The wall plate units and the wall column units are connected through connecting plates. The assembling degree is high, the structure is safe, and parts can be directly detached, can be partially replaced and can be repeatedly used.

The application discloses a magneto, which comprises a shell, a magnetic core, a spring, a shear plate, a shear pin and a coil; the magnetic core is arranged in the shell; the spring is arranged between the magnetic core and the shell, and the lower end of the spring is abutted against the inner side surface of the shell; the shear plate and the guide cylinder are sleeved on the outer side surface of the magnetic core, and the upper end of the spring is abutted against the bottom of the shear plate; the shear pin is arranged on the shear plate and is inserted into the magnetic core; the magnetic core is cut off from the shear pin when moving downwards in the shear plate; the bottom of the shell is provided with the coil; the magnetic core enters the coil after being cut off from the shear pin, so that the coil generates an induced voltage. The magneto of the application can cut off the shear pin under the condition of low acceleration and long duration, and the magnetic core can pass through the coil under the guidance of the guide cylinder to generate an induced voltage, so that the purpose of triggering the magneto is achieved; the structure of the magneto is safe and reliable; the magneto is low in cost and can be triggered under specific conditions.

The invention discloses a structure for a joint of a road underpass and a rear opening of an existing underground structure, which comprises the existing underground structure, and the rear opening is formed in the side wall of the existing underground structure; the protective ring beam is poured on the outer side of the side wall, the protective ring beam is arranged in a circle in the circumferential direction of the rear opening, and a rubber water stop strip is embedded in a construction joint between the side, facing the side wall, of the protective ring beam and the existing underground structure; the road underpass channel is coaxially arranged on the other side, away from the side wall, of the protective ring beam, and a deformation joint is formed between the road underpass channel and the other side of the protective ring beam; and the water stop belt is arranged in the deformation joint, and the two opposite sides of the water stop belt are buried in the road underpass channel and the protective ring beam correspondingly. The problem that the waterproof effect is poor when the rear opening is connected under the condition of asynchronous construction of the road underpass and the existing underground structure is solved.

A main oil supply hole, an auxiliary oil supply hole A and an auxiliary oil supply hole B are formed in a tile block, the auxiliary oil supply hole A and the auxiliary oil supply hole B are connected with an oil supply groove A and an oil supply groove B respectively, and the oil supply groove A and the oil supply groove B are formed in the two sides of the tile block respectively. The invention can be applied to rotating machinery rotating at high speed, can rotate bidirectionally, and can bear large load at the same time. The two-way rotating impeller can rotate in two directions, can be used under different working conditions, is high in lubricating efficiency, and is particularly suitable for impeller machinery needing forward high-speed rotation and reverse rotation.

The utility model relates to lighting lamps and lanterns technical field, specifically disclose a kind of ceiling lamp with hidden type adjusting structure and multifunctional integrated unit to solve the problem that existing product mounting structure is exposed, inconvenient and low function integration degree is adjusted.The ceiling lamp includes lamp body, mounting plate, light source module and driving power supply.The core of its technical scheme is: set hidden type installation component, including the hook that can be turned over and stored in the recess of lamp body and the pressing plate for fixing the hook;And integrated light parameter adjusting component, including the openable code cover on lamp body and the code switch group arranged below it, the code switch group is used to preset the lighting mode, color temperature and power of light source.The utility model realizes the simple and beautiful appearance of lamp by hiding and integrating functional structure, provides double operation approach of professional preset and convenient user control, enhances the practicality, safety and market competitiveness of product.

The present invention discloses a telescopic joint device and a lattice frame, wherein the left and right ends of a left sleeve are respectively provided with a first and a second flange, the left and right ends of a right sleeve are respectively provided with a third and a fourth flange, and the centers of the second and fourth flanges are provided with through holes; the left end of a transmission rod passes through the through hole on the second flange and extends into the inner cavity of the left sleeve, and the right end of the transmission rod passes through the through hole on the fourth flange and extends into the inner cavity of the right sleeve; the ends of both ends of the transmission rod are respectively provided with a first baffle and a second baffle; a first elastic element is provided between the first baffle and the first flange and between the second baffle and the second baffle; a second elastic element is provided between the first baffle and the second flange and between the second baffle and the fourth flange; a third elastic element is provided between the second flange and the fourth flange; and the second flange and the fourth flange are connected by a fourth elastic element. The present invention can prevent the lattice beam column from generating a large stress when a large deformation occurs, resulting in an unstable overall structure and a safety risk.

The utility model relates to the technical field of automobile wire harnesses, in particular to an automobile communication wire harness assembly which comprises an integrated communication body, a cable gland assembly is arranged on the side face of the integrated communication body, a sheath assembly is arranged in the cable gland assembly, and an overload protection wire set, a high and low temperature resistant wire set and a signal transmission wire set are arranged in the sheath assembly. According to the utility model, the cable gland consisting of the threaded cylinder rod, the rubber clamping ring, the clamping claw, the packing head and the like is used for clamping and fixing the automobile communication wire harness, and the cable gland can be arranged at the joint of a cable port and electrical equipment, so as to lead in a cable and fix the position, thereby achieving the sealing and explosion-proof effects; induced magnetic fields between every two adjacent coils can be offset through the twisted pairs, so that the anti-interference effect is achieved, the twisted pairs are used for enhancing the anti-interference capacity of the adjacent cables and reducing interference of signals of the twisted pairs to the outside, and the shielding layer can absorb the influence of electromagnetic force.

The invention provides a construction method for in-situ assembly of a single-wall steel hanging box cofferdam, a telescopic and hanging cross-shaped beam assembly is used as an assembly bracket, the cross-shaped beam assembly comprises a cross-shaped main beam body formed in a cross-shaped crossing mode, and four branches of the cross-shaped main beam body form guide sleeves respectively; each group of cross-shaped main beam bodies is provided with a plurality of guide sleeves, a telescopic beam piece is arranged in each guide sleeve in a sliding and sleeved mode, each telescopic beam piece can retract or stretch out of the corresponding guide sleeve in the branch extension direction, each group of cross-shaped main beam bodies are installed in the corresponding steel casings, and holes allowing the telescopic beam pieces to stretch out and draw back are formed in the steel casings. And the cross-shaped main beam body is supported and fixed by a bearing bracket which is welded and fixed on the inner wall of the steel casing. The telescopic cross-shaped beam is used as the in-situ assembly bracket of the single-wall steel hanging box cofferdam, the cross-shaped beam is used for a cofferdam hanging system in the later period, one structure has two purposes, the structure is safe and reliable, the problem that the bracket is difficult to cut off after cofferdam assembly is completed is solved, the construction difficulty is small, and the construction period and the cost are saved.

The utility model relates to the technical field of stay cable construction, and provides a stay cable. The stay cable comprises a stay cable body, two anchoring assemblies, a protection assembly and a cable force monitoring assembly. Wherein one anchoring assembly is arranged at the main beam end of the stay cable body, and the other anchoring assembly is arranged at the cable bent tower end of the stay cable body. The protection assembly is arranged at the main beam end of the stay cable body and connected with one anchoring assembly, and the protection assembly is used for separating the main beam end of the stay cable body from the external environment. The cable force monitoring assembly is arranged on one anchoring assembly and used for monitoring the cable force change of the stay cable at the end of the main beam. According to the stay cable provided by the utility model, the stable performance of the stay cable can be kept for a long time, the safety of a bridge structure is ensured, and the durability of the stay cable is improved.

The invention discloses an unpowered emergency drainage device for a flooded plant of a hydraulic power plant. The unpowered emergency drainage device comprises a buoyancy assembly, a transmission assembly, a drainage channel and a drainage channel thrust butterfly valve. The buoyancy assembly at least comprises a driving block, and the drainage channel thrust butterfly valve is installed in the drainage channel. The transmission assembly comprises a fixed transmission seat, a telescopic power rod and a transmission rod, and the fixed transmission seat is fixedly mounted; the telescopic power rod is rotationally mounted on the fixed transmission seat, one end of the telescopic power rod is rotationally connected with the driving block, and the other end is a transmission part; the transmission rod is slidably mounted on the fixed transmission seat, one end of the transmission rod is in contact with the transmission portion, and the other end of the transmission rod is in contact with the drainage channel thrust butterfly valve. Buoyancy or gravity is ingeniously used as a driving source, so that the driving block can automatically ascend or descend along with the change of the water level, the opening and closing of the corresponding valve are driven through the ascending or descending action of the driving block, the opening and closing of the drainage channel are effectively controlled, and the device can automatically operate under the conditions of power failure and circuit failure.