2651 results about "Culvert" patented technology

The invention discloses an afterburner integrated with a stabilizer and a worm wheel rear rectification support plate. A combustion part in the afterburner is integrated with a worm wheel rear load-bearing framework; the worm wheel rear rectification support plate is integrated with an inner culvert flame stabilizer, and cooling air is fed; a fuel oil supply pipe and a fuel oil nozzle are arranged in the rectification support plate; main fuel oil is transversely sprayed out from two sides of the support plate; and duty fuel oil is sprayed out from a groove on the rear surface of the stabilizer to form a duty flame. A pneumatic appearance of an outer culvert flame stabilizer is designed as a V-shaped bluff body, and the cooling air is fed into the outer culvert flame stabilizer; a fuel oil pipeline is arranged in the outer culvert flame stabilizer; the main fuel oil is transversely sprayed by a baffle plate nozzle; and the duty fuel oil is sprayed out from a groove on the rear surface of the outer culvert flame stabilizer. An annular flame stabilizer is arranged between the inner culvert flame stabilizer and the outer culvert flame stabilizer, so that functions of the stabilizer and a flame coupler are realized in a circumferential direction. The internal parts of the afterburner are integrated, so that the part utilization efficiency is improved, and the engine thrust-weight ratio is increased.

The invention discloses an automatic vehicle navigation method, a navigation pattern information compiling method and vehicle navigation equipment. The automatic vehicle navigation method includes: displaying navigation pattern information on a road; acquiring the navigation pattern information through the vehicle navigation equipment; and regulating vehicle running parameters by the vehicle navigation equipment according to the acquired navigation pattern information. By the automatic vehicle navigation method, a function of satellite-free automatic vehicle driving can be realized, and automatic vehicle navigation for culverts, tunnels and dense high-rise building districts can be realized. The ground navigation pattern information acts in a close range, so that accuracy is high. Implementation cost of the automatic vehicle navigation method is low, so that whole-system implementation cost in automatic vehicle navigation can be lowered effectively. In addition, automatic power transmission, automatic circuit switching for vehicle lane changing and the like can be achieved for electric vehicles during automatic navigation, so that wide-range application of electric vehicles can be availed, dependence of traffic systems on petroleum is lowered and application of wind power and nuclear power in road traffic systems is achieved.

The composite rotating fixed-wing aircraft consists of the coaxial counter-paddle, reverse gear, engine output shaft, engine with a starter-generator, wings, tail blades, landing device, culvert, steering gear, fairing, fuselage, motor, motor drive shaft, wing control unit of small angle of attack, aileron rudder surface, and tailplane rudder surface. Co-axial counter-blade is located in the upper part of the aircraft, which connects with the engine output shaft; the reverse gear is installed between the co-axial counter-propellers; the motor connects with motor drive shaft powered by the starter-generator of the engine; the wings are located on both sides of aircraft and connect with the fuselage; the tail blades are located at the aircraft tail, which are installed behinde motor drive shaft; the landing device is located under the lower part of the fuselage and fixed with it; the culvert connects with the landing device; the fairing is installed in the culvert and connects with the steering gear; the wing control unit of small angle of attack is installed on the wing. The aircraft design method has six steps with strict scientific idea; this invention has a wide range of practical value and application prospect.

The invention relates to a construction method for an underground box culvert of an existing railway line which is characterized in that a first-dig last-push construction method is adopted; a temporary beam foundation is firstly constructed and a working pit is dug; a D-shaped temporary beam and a cross beam are erected to reinforce the existing railway line; a foundation pit on the jacking section is dug; the box culvert prefabricated in the working pit is integrally jacked by utilizing a hydraulic jack for the back constructed in advance; and the displacement of the box culvert is controlled by a positioning beam. The invention solves the construction difficulties in the prior art, overcomes the phenomena of head raise, head stab, over head and the like of the box culvert during jacking construction, has the advantages of great technical superiority, line safety guarantee and construction speed acceleration, and is suitable for the box culvert construction of underpasses, bridges and culverts of the existing railway underpass line on railway.

The invention provides a building template and a method for preparing the same. The invention particularly relates to various solid wastes: wood and stalk fibers, waste plastics, fly ash and waste slag are subjected to co-blending, plasticizing and granulation at a temperature of between 170 and 185 DEG C, and are subjected to die pressing or rolling at a temperature of between 185 and 200 to obtain the novel building template. For the obtained building template, the tensile strength is 18.0MPa, the bending strength is 22.0MPa, the impact strength is 7.0KJ / m<2>, and the application temperature is between 15 DEG C below zero and 55 DEG C; the building template can be repeatedly used for eight to twelve times, and can be recovered as a raw material for recycling by 100 percent, and the building template can be applied to buildings of facilities such as high-rise buildings, electric power stations, railway culverts, underground stock houses, bridges and the like.

The invention discloses a reservoir culvert detection robot. A special pipeline robot aiming at the reservoir culvert detection work is not designed in the prior art. The reservoir culvert detection robot comprises a driving wheel group, a steering system, a connecting mechanism, a driven wheel group and a control system, wherein the driving wheel group and the driven wheel group are connected through the connecting mechanism, the steering system controls the steering of the driving wheel group, the driving wheel group comprises wheel leg mechanisms and a transfer system, the three wheel leg mechanisms are uniformly distributed and arranged on the side wall of a first main installing plate, the transfer system is arranged in the center part of the first main installing plate, and drives the three wheel leg mechanisms, and the steering system comprises a rope, a steering rope roller, a steering motor, a steering reset spring, an initial position stop pin, a pull arm and a terminal position stop pin. The reservoir culvert detection robot is suitable for the work environment of a reservoir culvert, and can do autoroatation around the pipeline center in situ in the pipeline for avoiding obstacles; two rows of wheel groups including the front row and the back row and a telescopic diameter change mechanism are adopted, the telescopic quantity of each wheel leg is respectively independent, and the pipeline diameter change adapting capability is high.

The invention relates to the field of air-ground dual-dwelling vehicle technology, in particular to a longitudinal-line-type dual-culvert vertical-lifting air-ground vehicle. The vehicle comprises a vehicle body, a driving cabin and vehicle wheels that are arranged on the vehicle body; the front end and the rear end of the vehicle body are respectively provided with a ducted propeller; each ducted propeller comprises a culvert, an airscrew and a bracket; the rotation shaft of the airscrew is arranged vertically; the airscrew is provided with an automatic inclining device; two airscrews are driven to rotate reversely by an engine of the vehicle body; the vehicle can be driven on road by the vehicle wheels and can realize vertical lifting and flying by the lifting force provided by the rotation of two vertical ducted propellers; the flying, landing, suspending, heading, withdrawing and rotating are realized by adjusting the rotation speed difference of the two ducted propellers and / or the elevation of the oars; the controllability is good and the structure is simple; the culverts protect the airscrews and the passerby simultaneously and avoid the passerby from being harmed by the airscrews, thus having high safety performance.

The invention discloses an alkali-free and chlorine-free liquid concrete accelerating agent as well as a preparation method and an application thereof. The product disclosed by the invention comprises the following components in parts by weight: 34-41 parts of aluminum salt, 0-5 parts of inorganic acid, 2-10 parts of organic alcohol, 0.2-2 parts of alcohol amine, 0.2-2 parts of coordination agentand 9-59 parts of water. The alkali-free and chlorine-free liquid concrete accelerating agent disclosed by the invention plays an important role in engineering such as sprayed concrete and sprayed mortar of various wells, tunnels, culverts, supports and other underground engineering, concrete emergency repair engineering, anchoring, sealing and plugging engineering and the like, and has wide application prospects.

The invention discloses an inorganic powder infiltration crystalline water-proof material which consists of 45 to 55 portions of 600#silicate cement, 20 to 25 portions of ultra-thin quartz sands, 25 to 30 portions of master batches, 1 to 5 portions of effective retarding water reducers and 1 to 5 portions of macromolecular tougheners and is manufactured by feeding the materials into a stirrer to be uniformly stirred. The inorganic powder infiltration crystalline water-proof material is characterized by having the advantages of secondary anti-permeability capacity, durable water-proof performance, high sticking performance, acid resistance and alkali matter resistance; besides, the inorganic powder infiltration crystalline water-proof material have the capacity of growing an insoluble crystal in the pores and the micro cracks of a concrete substrate to plug the pores and the micro cracks, thereby improving the anti-permeability capacity of the concrete and achieving the goals of anti-permeability and anti-leakage. The inorganic powder infiltration crystalline water-proof material can be broadly applied to the water-proof projects of railways, roads, ports and docks, culverts, dams and pools as well as large underground projects.

A single-component asphalt polyurethane waterproof coating mainly comprises the following raw materials in part by mass: 45-70 parts of polyether polyol, 10-35 parts of isocyanate, 0.2-1 part of stabilizer, 25-50 parts of petroleum bitumen, 6-25 parts of compatibilizing agent, 10-30 parts of plasticizer, 40-80 parts of filler and 0.5-2 parts of catalyst. The single-component asphalt polyurethane waterproof coating mainly takes the petroleum asphalt as a liquid softener, does not contain toluene diisocyanate, any organic solvent or other volatile components, and meets a requirement on environment friendliness; when in use, the single-component asphalt polyurethane waterproof coating is directly applied to a waterproof base surface of a building and solidified by moisture to form a waterproof coating with high strength and high elasticity, thus not only simplifying a construction process and but also avoiding nonuniform preparation and mixing of a multi-component asphalt polyurethane waterproof coating; the single-component asphalt polyurethane waterproof coating is applicable to water, seepage and moisture prevention of construction works such as a building roof, a basement, a bridge, a tunnel, a culvert, in particular to a waterproofing work of a wet base surface.

A water curing asphalt polyurethane composite waterproof coating mainly comprises a component A and a component B. In terms of mass part, the component A consists of 60-85 parts of polyether polyol, 10-25 parts of isocyanate and 2-10 parts of plasticizer; and the component B consists of 40-70 parts of petroleum asphalt, 5-20 parts of compatilizer, 6-25 parts of plasticizer, 0.5-4 parts of stabilizer, 1-12 parts of water, 25-55 parts of filler, 8-20 parts of calcium hydroxide, 0.1-2 parts of catalyst and the like. When the water curing asphalt polyurethane composite waterproof coating is in use, the component A and the component B are uniformly mixed and the mixture is directly smeared on a waterproof datum plane of a building and is cured to form a waterproof film with the advantages of high strength, high elasticity and favorable low-temperature flexibility. The water curing asphalt polyurethane composite waterproof coating disclosed by the invention is simple in production process, low in cost and free from of tar or any organic solvent, meets the requirement of environment friendliness, is suitable for water resistance, seepage resistance and moisture resistance of construction engineering such as roofs, basements, bridges, tunnels and culverts and is especially suitable for waterproof engineering of damp datum planes.

The invention discloses a waterproof coiled material having a pre-laid anti-sticking function. A preparation method comprises the steps: with a plastic sheet material as a supporter, a hot melt pressure sensitive adhesive is blade-coated on the plastic sheet material, an acrylic acid isolating protection layer is spayed on the hot melt pressure sensitive adhesive layer, and a PET silicon-coated isolating film is coated on a topside layer. The waterproof coiled material disclosed by the invention has high tensile strength and good tear resistance, is non-toxic and odorless, is wide in adaptive temperature range, can be welded or be in self-adhesive lap joint, forms a full bonding with post-poured concrete, can be directly constructed while walking on the coiled material, and is suitable for waterproof of underground waterproof engineering, such as basements, artificial lakes, culverts, tunnels, subways and the like.

The invention discloses a pre-fabricated concrete box culvert, the assembly structure thereof and an assembly method. The invention can ensure that the mortar is completely filled on a connecting surface of the pre-fabricated concrete box culvert, thereby furthest reducing the pre-stress damage caused by the sliding when the reinforcing steel bar is fixed, and allowing the pre-fabricated concrete box culvert to be assembled into a structure with extremely strong adhesion force, firmness and reliability, furthest reducing the loss of the bundled reinforcing steel bars and avoiding the damage to the structure.

The invention adopts a large-diameter main culvert coaxial counter-rotating dual-rotor or a fan body to bear the main hoisting force, wherein multiple small-diameter auxiliary culvert rotors or fans are horizontally and symmetrically arranged at the periphery of the dual-rotor or the fan body; connecting arms of the rotors or fans can stretch and contract, twist and swing to carry out four degree-of-freedom actions, bear the auxiliary hoisting force, carry out direction control and serve as vertex prevention rings; a main side spout and a plasma energy wave generator vertex prevention ring are arranged on a main culvert; and a variable inertia system is arranged on the main rotors to realize the ability of preventing turbulent flow from changing into twisting wind. The slurry and flood current overhead-hoisting rescue method is competent for the overhead-hoisting rescue mission and can be combined with the slurry and flood current overhead-hoisting rescue amphibious medical ambulance to constitute a special overhead-hoisting rescue amphibious vehicle. Slurry current propellers such as an extension-type swing conical-head spiral front wing long roller floating type or gyro helix front wing floating head type, a crushing roller front wing floating type and a herringbone one-sided jagged-grain hub telescopic front wing crushing roller tire boosters are arranged at the four corners of a machine frame of the amphibious medical ambulance, so that the amphibious medical ambulance has the capability of floating and driving in the slurry current, and the design method of the slurry flood current special rescue method and the amphibious medical ambulance is solved.

The invention relates to a method for constructing an agricultural drainage and ecological purification system. The method comprises the following steps that: an elliptic ecological buffer area is formed at the tail end of an agricultural drainage channel and before an agricultural drainage culvert pipe; aquatic plants which can easily absorb N and P nutrient elements are planted in the ecological buffer area; an agricultural drainage ecological purification barrel is arranged in the agricultural drainage culvert pipe; a biological purification ring is arranged on the ecological purification barrel; water drained out of a farmland flows through the ecological buffer area by the agricultural drainage channel; certain suspended pollutants are settled and intercepted by staying for a certainperiod of time in the ecological buffer area to achieve a preliminary water purification effect and the effect of controlling the flow rate and the retention time; and larger suspended sundries are further intercepted by a wire mesh at the front end of the agricultural drainage ecological purification barrel before the water drained out of the farmland flows into the agricultural drainage ecological purification barrel to ensure that the inside of the purification barrel cannot be blocked. The method has the advantages that: the N and P nutrient elements in the water drained out of the farmland is effectively reduced by an ecological method in combination with the construction of the agricultural drainage culvert pipe, so that a receiving water body is prevented from being eutrophicated.

The invention provides a railway settlement monitoring system and an online monitoring method. The monitoring system comprises a data collection station, a benchmark hydrostatic level gage and a monitoring hydrostatic level gage, wherein the data collection station, the benchmark hydrostatic level gage and the monitoring hydrostatic level gage are respectively provided with a cable connector, and the cable connector on the benchmark hydrostatic level gage and the cable connector on the monitoring hydrostatic level gage are connected with the data collection station through a cable after being serially connected with each other; the benchmark hydrostatic level gage and the monitoring hydrostatic level gage are respectively provided with a ventilation pipe connector and a liquid pipe connector, the ventilation pipe connectors on the benchmark hydrostatic level gage and the monitoring hydrostatic level gage are serially connected with each other through a gas pipe, and the liquid pipe connectors on the benchmark hydrostatic level gage and the monitoring hydrostatic level gage are serially connected with each other through a liquid pipe. The automatic monitoring of the settlement situation of a railway foundation, bridges and culverts, tunnels and transitional sections can be realized on the basis of the inductance frequency regulation principle and the intelligent monitoring method, the manual intervention factor is effectively eliminated, the measuring precision is improved, and the labor intensity of workers can be alleviated.

The invention provides an upper-flow-regime micro-expanding highway bridge post-tensioning porelike grouting agent and a preparation method of the upper-flow-regime micro-expanding highway bridge post-tensioning porelike grouting agent. The grouting agent comprises a superfine mineral admixture, an expanding agent, a polycarboxylate superplasticizer powder, a plastic expanding agent, an anti-settling agent, a redispersible rubber powder, a retarder, a defoamer and an air entraining agent, and the targets of low water-binder ratio (0.26-0.28), high fluidity (the initial fluidity is not more than 17s), zero bleeding (the free bleeding rate is 0% within 24 hours), early expanding (the free expanding rate is 0-2% within 3 hours) of a grouting material are achieved after the grouting agent is doped. A slurry layer is not layered or does not bleed, expands slightly, and is good in filling degree and volume stability at the low temperature, so that the quality reliability and durability of post-tensioning prestressed porelike grouting agent can be comprehensively improved. The post-tensioning prestressed concrete porelike grouting agent completely meets the requirements in the Technical Specifications for Construction of Highway Bridges and Culverts (JTG / TF50-2011).

The invention discloses a mooring type motor-driven and unmanned helicopter and a system thereof. The mooring type motor-driven and unmanned helicopter can remain in the air for a long time and can be used for the tasks such as detection and the like; the helicopter comprises a helicopter body, an electric engine, a group of servo operating devices and at least one mooring rope; the helicopter body is used for forming airflow rectifying culverts which are provided with a frame, the electric engine is installed on the frame, one end of an output shaft of the electric engine is connected with a group of blades by a first coupler, a group of servo operating devices respectively comprises a winch controlled by a servo electric engine, one end of the mooring rope is connected with the helicopter body by a corresponding mooring rope coupler, and the other end of the mooring rope winds around the winch. The electric engine is connected to a power supply device on the ground by power transmission cable in at least one mooring rope. The mooring type motor-driven and unmanned helicopter can determine height and position accurately within a height scope of 10 meters to 500 meters and has the advantages of outstanding maneuverability, rapid, simple and convenient unfolding of equipment, excellent service performance and convenient in use and maintenance.

The present invention discloses an apparatus and a method for the ecological fishing cultivation based on the composite vertical flow artificial wetland; wherein, the apparatus adopts the water stream as the carrier among a cultivating fish pond, an artificial wetland, an ecological channel and a water compensation pond that are serially connected with each other; the cultivating fish pond is provided with a water pump and is communicated with the artificial wetland through a culvert pipe, the artificial wetland is connected with the ecological channel, and the communication position between the ecological channel and the cultivating pond is provided with a stream fall about 50 cm. The apparatus has simple structure, is convenient to cultivate the fish and obviously improves the cultivating yield, which protects the water environment while realizing the high-quality and high-efficient health cultivating of the fishes so as to realize a pond cultivating composite apparatus that can be sustainable to use.

The invention relates to an overland runoff rainwater storing and purifying integrated device with flooded culvert pipes and an overland runoff rainwater storing and purifying method. The device comprises a pre-precipitating chamber (2) and a wet land unit (2), wherein overland runoff rainwater passes through a perforated partition (4) and enters the wet land unit (2) after being precipitated preliminarily; the perforated culvert pipes (3) are arranged in the wet land unit (2) side by side; the culvert pipes (3) transversely penetrate in two sides of the wet land unit (2); perforated plugs (12) are arranged at two ends of each culvert pipe (3); the wet land unit (2) comprises a gravel cushion layer (9), a sand filter layer (8) and a planting soil layer (7); and perforated drainage pipes (5) are buried in the gravel cushion layer (9). By using the device and the method, particles and soluble pollutants in the runoff rainwater can be removed, so that the pollutants in the runoff rainwater are eliminated; and the treated rainwater is stored in the device and the culvert pipes (3), wet land plants can grow by using the treated rainwater, the water seeps to surrounding soil by submerging two ends of each culvert pipe in a wet land, and the purpose of continuously cultivating and supplementing underground water is achieved.

A three piece concrete culvert system includes a set of horizontally spaced precast side wall sections having inwardly projecting and opposing steps or surfaces which support opposite ends of a precast arched top wall section. The side wall sections include extension portions which project substantially above the ends of the top wall section for increasing the capacity of the side wall sections to resist thrust from the top wall section. Vertically spaced and generally horizontal layers of soil reinforcement members or grids may be positioned within the soil backfilled adjacent the outer surfaces of the side wall sections, and precast concrete anchor members may be attached to the side wall sections above supporting footers for the side wall sections. Shims are used between the footers and the anchor members for temporarily positioning and aligning the side wall sections before receiving the top wall section.

The invention discloses an exhaust system for a gaseous film cooling central cone of a turbofan aircraft engine, belonging to the technical field of turbofan aircraft engines. The system sequentially comprises an exhaust system cylinder body (1) of the engine, a confluence ring (2) and a central cone (3) from inside to outside and is characterized in that a central cone end plate (8) is arranged inside the central cone (3); an inner cavity of the central cone is divided into two independent cavities by the central cone end plate, respectively including a central cone front cavity (9) and a central cone rear cavity (10); a gaseous film hole (11) is arranged on the wall surface of the central cone rear cavity; a hollow turbine rear support plate (4) is provided with a hollow cavity which is respectively communicated with an external culvert channel (6) and the central cone rear cavity (10); and a deflector (12) is arranged at the part of the hollow turbine rear support plate (4), which is communicated with the external culvert channel (6). According to the invention, the caudal infrared radiation of the exhaust system can be greatly reduced by reducing the surface temperature of the central cone body.

The invention discloses a culvert-type vertical take-off and landing lifting body unmanned aerial vehicle and relates to the technical field of vertical take-off and landing unmanned aerial vehicles.The culvert-type vertical take-off and landing lifting body unmanned aerial vehicle comprises a fuselage (1), lifting force rotor wings (2), a take-off and landing culvert (3), tilting-rotating thrustculverts (7) and tilting-rotating thrust rotor wings (8). The take-off and landing culvert (3) is composed of a through hole penetrating through the upper surface and the lower surface of the fuselage (1), and the lifting force rotor wings (2) are arranged in the take-off and landing culvert (3). The tilting-rotating thrust culverts (7) are hinged to the rear end of the fuselage (1) through tilting-rotating control mechanisms (9), the tilting-rotating control mechanisms (9) are configured to be capable of enabling the included angle between the axis of each tilting-rotating thrust culvert (7)and the axis of the fuselage (1) to be variable, and the tilting-rotating thrust rotor wings (8) are arranged in the tilting-rotating thrust culverts (7). Under the conditions that the vertical take-off and landing capacity of the unmanned aerial vehicle is maintained and the overall weight of the unmanned aerial vehicle is not excessively increased, the flight speed of the unmanned aerial vehicle is increased, the flight stability of the unmanned aerial vehicle is improved, the rotor wing exposed problem is avoided through the culverts, and the flight safety and the take-off and landing hovering efficiency are improved.

The invention relates to a deep water silt layer geological large-span multi-line reinforcing system and a jacking culvert construction method, and aims at providing a reinforcing system and a construction method for a high-water-level, long-jacking-stroke, large-span and high-tonnage jacking culvert to penetrate through multiple existing lines. The reinforcing system comprises a high-pressure jet grouting secant pile, a fender pile, an anti-traversing pile and a supporting pile. The jacking culvert construction method comprises the steps of starry well-point dewatering, foundation pit excavation and sliding plate fabrication, frame bridge prefabrication, line reinforcement, jacking equipment installation and process control. By adopting starry well-point dewatering, the problems of underground water burst and foundation instability during jacking are solved; since a frame bridge is integrally jacked after being prefabricated, the rigidity is high, the seismic performance is good and the influence by climate is smaller; compared with the traditional construction method, the reinforcement and the installation are convenient and easy to operate, the jacking speed is quick and the construction period is shortened; I-shaped steel, steel rails and sleepers used for engineering can be recycled; the overall economic benefits are remarkable, the practical value is greater and the application prospect is wide.

Modular mold equipment for producing concrete culverts with tight tolerances. Modular mold equipment having a coupling plate is used to align and interconnect components of the mold. The components being aligned may have recesses for receiving the coupling plate. Modular mold equipment system with an extended size range to cover all standard concreted duct product sizes. Modular mold equipment having a pallet guide adjustment mechanism adapted for setting the pallet at a desired location in relation to a form. The desired location is based on a wall thickness of a concrete culvert to be produced. Modular mold equipment having a core that includes a core corner and another core component adapted to be coupled to the core corner, and locking apparatus adapted to lock the core corner to the other core component via a mechanism that extends outside the core.

The invention discloses a comprehensive aquaculture device and a method based on a multi-trophic-level ecological ditch. An aquaculture pond is connected with a filter feeding type fish aquaculture area through a culvert pipe, the filter feeding type fish aquaculture area is connected with an emergent aquatic plant purification area through a water filtration partition, the emergent aquatic plant purification area is connected with a submerged plant purification area through a water filtration partition, a water filtration partition is arranged at the tail end of the submerged plant purification area, and a water pump is arranged inside each partition. The aquaculture method includes the steps that the step A, source water which is acquired on the rim and accords with fishery water quality standards is pumped into the aquaculture pond through automatic flow or a water pump; step B, the aquaculture mode of combination of high-density stocking and multiple stocking and multiple fishing is adopted; step C and step D, along with arrival of aquaculture seasons, an impeller type aerator and a water ploughing machine are arranged in the aquaculture pond; step E, fishes are stocked in the filter feeding type fish aquaculture area; step F, leakage and water evaporation are carried out, and standard source water is added into the aquaculture pond. By means of the comprehensive aquaculture device and the method based on the multi-trophic-level ecological ditch, structure is simple, aquaculture is convenient to operate, aquaculture yields are improved greatly, and water area environment is protected.

The invention discloses a method for testing the grouting compactness degree of a prestressed pore of a bridge based on an elastic-wave energy dissipation rate, belonging to the technical field of quality detection on bridge / culvert engineering. In the grouting construction on a prestressed anchor (cable) of a bridge, the prestressed anchor (cable) can be corroded caused by undesirably-packaged cement mortars and anchor rods, thereby causing the failure of the prestressed anchor (cable) and then endangering the safety of structures. In the prior art, the anchoring quality of an anchor rod can not be evaluated completely. The method provided by the invention is implemented through analyzing the fluctuation characteristics (speed, frequency, elastic-wave energy dissipation, and the like) of pickup signals of sensors at the two ends of the prestressed anchor by adopting impact elastic waves generated by vibrations at the two ends of the prestressed anchor of the bridge so as to detect the grouting compactness degree of the prestressed anchor (cable) of the bridge. The method provided by the invention has the advantages of maximizing the elimination of system errors caused in the process of test, accurately testing the elastic-wave energy dissipation rate of the prestressed anchor (cable), and effectively completing the test on the grouting compactness quality of the prestressed anchor (cable) of the bridge. The method provided by the invention is also applicable for the test on the grouting compactness qualities of all prestressed structures the two ends of which are provided with exposed anchor heads.

The invention discloses a railway elevating and fixing device and a railway bridge and culvert construction method adopting the railway elevating and fixing device. The railway elevating and fixing device comprises longitudinal beams and a sleeper beam, the sleeper beam penetrates through a track downwards and is parallel to a concrete sleeper, the top parts at the two ends of the sleeper beam are respectively and fixedly connected with one longitudinal beam perpendicular to the sleeper beam, and a support point pile used for supporting a beam body is fixed under the longitudinal beam. The railway elevating and fixing device and the railway bridge and culvert construction method adopting the railway elevating and fixing device solve the problem that the fixing effect of the traditional railway bridge and culvert construction method can not meet the requirements for the railway speed, and the elevation span can not meet the requirements for large span bridge and culvert passing.

The invention relates to a construction method for reinforcing a concrete structure by using carbon fibers, belonging to the technical field of building constructions. The construction method comprises the following construction steps of: (1) carrying out a concrete foundation treatment; (2) coating priming paint; (3) carrying out incomplete part repair by utilizing epoxy putties; (4) sticking carbon fiber sheets; and (5) curing. The construction method disclosed by the invention has the advantages of simple and rapid construction, no need of any clamp, mould plate and support and low construction cost, and is suitable for each type of reinforced concrete structure or reinforcement and enhancement of the member, reinforced concrete structures, such as bridges, industrial and civil buildings and special structures, high-rise structures, impounding reservoirs, jars, culverts, tunnels, wharfs and harbors and the like, and is also suitable for the repair and enhancement of the structures.