580results about How to "Won't collapse" patented technology

The invention discloses a preparation method of a silica aerogel aqueous heat-insulating coating, and is characterized in that: prepared SiO2 microspheres are hydrophobic inside and hydrophilic outside; and the aerogel microspheres can be added into an aqueous coating carrier to prepare a good heat-insulating material. The main preparation method comprises the following steps of: before drying the prepared wet gel microspheres, performing surface modification by using an organic silane or an organic chlorosilane, so that the prepared wet gel microspheres are hydrophobic by grafting a large number of alkoxy groups or alkyl groups on the surfaces thereof, or directly preparing the hydrophobic wet gel microspheres; performing surface modification on the microspheres by using a hydrophilic silane coupling agent, and drying to obtain the SiO2 microspheres which are hydrophobic inside and hydrophilic outside; and adding the prepared microspheres into an aqueous coating for preparing the aqueous heat-insulating coating.

The invention belongs to the technical field of mining engineering and building materials and particularly relates to a mine filling cementing material slurry and a preparation method thereof. The preparation method comprises the following steps of: with steel slag, mineral slag and industrial byproduct gypsum as cementing agents and tailing sand as a filling aggregate, adding water, mixing and stirring uniformly to prepare mine filling cementing material slurry, wherein a dry basis of raw materials comprises the following components in percentage by weight: 1-7% of steel slag, 5-12% of mineral slag, 2-10% of industrial byproduct gypsum and 75-90% of tailing sand, and the sum of the weight percentage of the dry basis of all the raw materials is 100%; adding water to regulate the mass concentration of the filling cementing material slurry to be between 65-75%. The mine filling cementing material slurry has the beneficial effects of higher strength, simple process, high flowability and suitablity for self-flowing filling; no cement or cement clinker or additives are added in the components of the filling cementing material slurry which is completely made of solid wastes, so that the utilization rate of the tailing sand is high, and the production cost is very low.

The invention discloses a physical similar simulation test device and a physical similar simulation test method for tilted stratums. The physical similar simulation test device comprises an external framework, a tiltable rack, a front baffle, a rear baffle, a hydraulic supporting device and a hanging hoisting device, a similar simulation test is performed on stratums with different tilt angles by adopting the device and the method, physical mechanical performances of stress distribution, displacement change and the like inside the stratums under the action of external disturbance, ground stress, external force application and the like can be measured to obtain related technical indexes and parameters so as to research the rule of the true stratums in the process, and the effective struts can be facilitated during the construction of the stratums, thus providing a guarantee for the safety construction of the stratums.

The invention discloses a preparation method of a composite ceramic filter core containing diatomite and charcoal. In the preparation method, raw materials with high melting points are not used, and a mode of first dispersion and then partial flocculation is used for preparing a slurry for slip casting to enable raw materials and pores in a green body to be highly and uniformly dispersed, thus the sintering temperature is not higher than 950 DEG C, and natural micropores in the diatomite can not collapse because of high-temperature sintering.

The invention discloses nanometer medicament microspheres. The microspheres comprise a medicament, nanoparticles, a polymer and medicinal auxiliary materials. The invention further provides a preparation method of the nanometer medicament microspheres. The method comprises the following steps of: preparing a medicament and medicinal auxiliary materials into a nanometer medicament; adding the nanometer medicament into a polymer-containing organic solvent mixed solution for emulsifying; adding a nanometer medicament-in-oil mixed suspension into a water mixed suspension containing nanoparticles or containing nanoparticles and a surfactant for emulsifying to obtain an oil-in-nanoparticle mixed suspension-nanometer medicament-in-oil compound emulsion; and curing the obtained compound emulsion, and centrifugally collecting microspheres, wherein the obtained microspheres comprise the medicament, nanoparticles, the polymer and the medicinal auxiliary materials. An appropriate polymer material and an appropriate microsphere preparation method are selected, the prepared microspheres have high envelop rate, and a layer of self-assembled nanoparticles on the surfaces of the microspheres has the effects of improving cell adhesion and reducing inflammation and microencapsulation caused by local excessive acid and hydrophobic materials. The method disclosed by the invention can be applied to preparation of other medicament slow release or controlled release microspheres.

The invention discloses a glaze and preparation of an embossment phantom glazed brick. The glaze comprises a ground glaze, a surface glaze and an embossment phantom printing glaze, wherein the ground glaze is prepared from a frit b, zirconium silicate, kaolin, calcined kaolin, potassium feldspar powder, fired talc, aluminum oxide powder, quartz powder, carboxymethyl cellulose, sodium tripolyphosphate and water; the surface glaze is prepared from a frit, the frit b, a frit c, kaolin, carboxymethyl cellulose, sodium tripolyphosphate and water; the embossment phantom printing glaze is prepared from parent glaze powder, zinc oxide, tin oxide, cerium oxide and ceramic adhesive roll-printing oil; the parent glaze powder is prepared from the frit c, kaolin, carboxymethyl cellulose, sodium tripolyphosphate and water. The preparation method comprises the following steps: sequentially applying the ground glaze and the surface glaze on a green brick, then printing the embossment phantom printing glaze, performing inkjet printing, and finally firing to obtain the embossment phantom glazed brick. The product disclosed by the invention has unique decorative effect and visual aesthetic feeling; moreover, each indicator can reach the standard requirements, so that the product has relatively strong universality, and is easily popularized in the industry.

The invention discloses a preparation method of freeze-dried fructus momordicae. The method comprises the following steps: selecting ripe fresh fructus momordicae with deep green surface; deactivating enzymes, cooling with clean water, perforating, pre-freezing and freezing; and drying with the vacuum freeze-drying technology and then discharging to obtain the entire freeze-dried fructus momordicae. Through the method disclosed by the invention, the freeze-dried fructus momordicae maintains the color, flavor, mouthfeel, shape and nutrient components of the fresh fructus momordicae.

The invention relates to an assembled quake-proof mobile house which is achieved by assembling steel-wooden-structure framework-type wall plates with roof plates, connectors and a damping base. Plate frameworks including gable plates, front and back enclosure wall plates and roof plates are all welded by square steel tubes. A wooden board is nailed on the outside of a framework steel tube; and the outside of the wooden board is pasted with water-tight thermal-insulation composite bricks or tiles. The damping base, the major part of which is buffer springs, is arranged at the bottom of the vertical post of the steel tube. Ground beams are arranged at the bottom of the wall plates, and a damping sliding groove is arranged between the ground beams and a foundation. The product provided by the invention can be produced in bulk in factories and then can be assembled after being transported on the site; therefore, the product can solve the long-term living problem in short time for people in stricken area; and if removing is essential, the product can be detached and rebuilt. Due to the damping base and damping sliding groove, when earthquake happens, the product can get rid of lateral shearing force and does not fall down. The assembled quake-proof mobile house has excellent earthquake-proof performance and can be suitable for using as temporary and long-term residences in areas in which earthquakes are common; and the assembled quake-proof mobile house also can be used as temporary headhunters, health centers and supplies warehouses and other buildings on rescue sites.

The invention relates to a method for preparing microspheres by water-in-oil-in-oil-in-water in the technical field of pharmacy, which comprises the following steps: a medicine solution is prepared first, and is dispersed into an organic solution with a slow release or controlled release functional material, and the stirring or swirling and so on is preformed to make the medicine solution dispersed evenly to form a suspension; then the suspension is added into an external oil phase to be stirred or swirled to form microspheres, and finally the microspheres are transferred into a large water phase for solidification; and then the microspheres are centrifugally collected, freeze-dried and preserved, wherein in the obtained microspheres, the medicine accounts for 0.01 to 50 percent of the weight of the entire microshperes, the slow release or controlled release material accounts for 20 to 99.99 percent of the weight of the entire microshperes, and an auxiliary material accounts for 0 to 30 percent of the weight of the entire microshperes. The microspheres prepared by the method have smooth and round surfaces and good uniformity, are regular, have no adhesion, and have adjustable grain diameters; the used organic solvent is environment-friendly, is easy to remove by water, and does not affect the treatment effect of the medicine; and the microspheres have high envelope rate, and small burst release and incomplete release.

The invention relates to an existing building surrounding type story-adding structure and a construction method thereof, and belongs to the field of structure seismic strengthening. According to the invention, outer covering type steel structures are added on the periphery of an existing building, and the steel structures surround the existing building and are connected end to end on the plane, so that the horizontal seismic load of the whole structures can be effectively increased. According to the invention, when newly added load-bearing type steel columns of the surrounding type structures exceed the top part of the existing building, load-bearing cross beams are arranged and connected with the newly added load-bearing type steel columns. The whole load at the upper parts of the newly added load-bearing cross beams is transmitted to the newly added load-bearing type steel columns and then the foundation. The surrounding type story-adding technology enables the new structures and the old structures to be closely connected in a hinged or rigid manner, so that the structure stability is increased, the stress system of the whole structure is reasonable, and the safety and the reliability of the whole structure are ensured. Through existing building surrounding type story-adding construction, the present problem about housing difficulty of people is solved and meanwhile a great deal of land resource of the nation is saved.

The invention provides a high-efficiency wood chip cutting device capable of processing in a cedar growing place, and belongs to the technical field of wood chip processing. The high-efficiency wood chip cutting device capable of processing in the cedar growing place comprises a carrier, a cab, wheels, a bottom support, a platform, a gear, a groove, a sliding chute, a motor, a hydraulic rod, a rotating support, a cutting plate, a hydraulic rod II, an electric telescopic column, a platform II, a fitting plate, an oval groove, a fitting groove, an indented rotary shaft, an electromotor, a cutting plate, a knife switch plate, an ovoid gear, a spring, a guide plate, a roller and a collecting frame, wherein the cab is fixedly connected to the top part of the right side of the carrier; the wheels are rotatably connected to the periphery of the bottom part of the carrier; the bottom support is rotatably connected to the left side of the cab; the platform is rotatably connected to the top partof one side of the bottom support; the gear is fixedly connected to the bottom part of the platform; the groove is nested on one side surface of the platform; the sliding chute is nested on the surface of the platform; and the motor is fixedly connected to one side surface of the bottom support and meshes with the gear through a transmission gear.

A tobacco seedling transplanting punching machine includes an engine, a throttle opening control cable, a clutch cable, transmission flexible shafts, punching drill bits, a vehicle frame, a water spray device, a power divider and a drill bit mounting rack; the vehicle frame includes a wheel, handlebars, a cross beam, landing legs, and a lifting handle, and a gradienter is arranged on the vehicle frame; the drill bit mounting rack includes cross rods, a fixing seat and connecting rods, tail ends of the two cross rods are symmetrically respectively arranged at two sides of the front end of the cross beam, the front end of each cross rod is connected with the connecting rod, the tail ends of the connecting rods are arranged on the fixing seat in a connection mode, and the punching drill bits are arranged below the fixing seat; power outputted by the engine is divided into two ways by the power divider to be outputted and then the two ways of power are connected with the transmission flexible shafts respectively, and the transmission flexible shafts pass through the fixing seat and then are connected with the punching drill bits respectively; the water spray device includes a water tank, a water spray pipe, a water pump and a water pump switch. One person can push the tobacco seedling transplanting punching machine for operation, so as to be convenient and save labor; with arrangement of two punching drill bits, two field ridges are punched at the same time, and the efficiency is high; and the water spay device ensures that holes cannot be collapsed.

Prefabricated pieces for residential houses, a prefabricated house and a construction method thereof are disclosed. Crossbeams, wall boards, support posts are prefabricated according to design sizes; above prefabricated pieces are designed into different shapes according to needs; all the prefabricated pieces are provided with reinforced heads in advance, so during construction, the prefabricated house can be formed only by welding the reinforced heads of the prefabricated pieces arranged in advance, thus realizing the fabrication of a building in a factory; and the finished building is a frame structure and has earthquake-resistance. The house adopts a double-layer wall board; a heat insulation layer is arranged between the two layers of the wall board, so the house is cool in summer and warm in winter. The prefabricated pieces, the prefabricated house and the construction method thereof can greatly reduce construction period, save manpower and reduce fabrication cost.

Aiming to solve the problems that harm to human health is caused due to drinking of underground water with high nitrate content and that an existing carbon source material in use has the defects of poor controlled release effect, easiness in causing secondary pollution, easiness in collapse and the like during application, the invention discloses a preparation method of controlled-release carbon source composite particles for use in biological nitrogen removal by denitrification. Solid-phase controlled-release carbon source composite particles can be taken as a filling medium in in-situ or ex-situ remediation of underground water nitrate pollution. When the solid-phase controlled-release carbon source composite particles are taken as a denitrification bacteria carrier, long-acting controllable organic carbon source release is provided. A degradable polymer and a natural plant are taken as carbon source releasing components, and a non-degradable polymer is taken as a framework material, so that a preparation process is relatively simple, and high mechanical performance and high efficiency of nitrogen removal by denitrification are achieved.

The invention relates to a preparation method for a metal-organic framework nanoparticle material with a mesoporous structure. The method comprises the steps of: dissolving a cationic template molecule and an anionic ligand molecule able to undergo electrostatic pairing with the cationic template molecule in an organic solvent, adding a soluble metal inorganic salt and a micromolecular organic-ligand molecule able to achieve coordination bonding with the metal ion so as to undergo solvothermal reaction under a proper temperature, thus obtaining the metal-organic framework nanoparticle with a mesoporous structure. The metal-organic framework nano-material prepared by the invention has an aperture in a mesoporous range, has high specific surface area and large adsorption capacity, and can be used in drug delivery systems, bioanalysis and detection, film fixation and other fields.

The invention discloses a method for preparing microspheres by using oil-in-nanoparticle mixed suspension-nanometer medicament-in-oil. The method comprises the following steps of: preparing a medicament and medicinal auxiliary materials into a nanometer medicament; adding the nanometer medicament into a polymer-containing organic solvent mixed solution for emulsifying; adding a nanometer medicament-in-oil mixed suspension into a water mixed suspension containing nanoparticles or containing nanoparticles and a surfactant for emulsifying to obtain an oil-in-nanoparticle mixed suspension-nanometer medicament-in-oil compound emulsion; and curing the obtained compound emulsion, and centrifugally collecting microspheres, wherein the obtained microspheres comprise the medicament, nanoparticles, the polymer and the medicinal auxiliary materials. An appropriate polymer material and an appropriate microsphere preparation method are selected, the prepared microspheres have high envelop rate, and a layer of self-assembled nanoparticles on the surfaces of the microspheres has the effects of improving cell adhesion and reducing inflammation and microencapsulation caused by local excessive acid and hydrophobic materials. The method disclosed by the invention can be applied to preparation of other medicament slow release or controlled release microspheres.

The invention provides a rechargeable zinc-manganese battery and a preparation method thereof. A positive electrode adopts a linear alpha-MnO2 material to replace a traditional amorphous manganese dioxide material, and the linear alpha-MnO2 material has a uniform structure. The large tunnels and vacancies in MnO2 increase the contact between the active material and the electrode, reduce the internal resistance of the battery, and improve the diffusivity of protons. The larger aspect ratio of MnO2 can make the preferred orientation degree of the material higher, thus improving the rate performance of the battery. Stable structure, not easy to collapse, the activity can be maintained at a high level, the decay rate is slow, more conducive to the battery cycle performance. In accordance withthat present invention, the preparation method of the alpha-MnO2 material is simple and feasible, the experimental reproducibility is good, the raw materials used are cheap and easy to obtain, the linear alpha-MnO2 material has a uniform structure, large aspect ratio, and stable structure, and is not easy to collapse and slow in attenuation rate.

The invention discloses an aqueous UV wood paint. The aqueous UV wood paint comprises the following components: 20-40% of aqueous polyurethane resin, 20-60% of aqueous UV resin, 0.2-0.6% of an antifoaming agent, 0.2-0.8% of a leveling agent, 0.2-0.8% of a wetting agent, 0.2-0.8% of a thickening agent, 0.2-0.8% of an initiator, 0.2-0.8% of a dispersant, 0.2-0.8% of matting powder, 5-40% of water, and 0.2-0.5% of a handfeel auxiliary agent. The invention also discloses a preparation method of the aqueous UV wood paint and an application technology thereof. The aqueous UV wood paint has the advantages of good environmental protection performance, strong adhesive force, high hardness, good wear resistance and coin scratching-resistant performance. The preparation method has the advantage of simple operation, by employing a microwave drying method, the drying speed is fast, drying requirement of a thicker coating can be satisfied, the production efficiency is high, and the aqueous UV wood paint is quit suitable for industrial production.

The invention discloses a preparation method of a micron or nanometer calcium phosphate / catechol-based polymer bone repair scaffold. The preparation method comprises the following steps: A, mixing 100 parts by weight of calcium phosphate, 1-40 parts by weight of pore-forming agent and 0.1-45 parts by weight of catechol-based polymer, and adding a trihydroxymethyl aminomethane-hydrochloric acid buffer solution to obtain a slurry mixture, wherein calcium phosphate is micron calcium phosphate and / or nanometer calcium phosphate, and the catechol-based polymer is a polydopamine or dopamine graft copolymer; B, forming the slurry mixture obtained in the step A by virtue of mold pressing, pouring or 3D (Three-Dimensional) printing, and then curing the mixture for 20-30 hours in a water bath kettle at 35-40 DEG C. The bone repair material scaffold prepared by the method has good bioactivity, osteoconduction, degrading capacity and biocompatibility, and has good mechanical properties at the same time. The bone repair material scaffold can be formed by virtue of a mold pressing, pouring or 3D printing method, and can be prepared into any shape and structure.

The invention relates to the improvement of mortice structure of wood floor and fiber glued floor, and the improvement of assembly method of wood floor and fiber glued floor, in particular to floor plastic fastener which is convenient for connecting and positioning. The improvement of the invention includes that plastic frame is arranged at the periphery of wood floor or fiber glued floor; the lower part of the external side of the plastic frame is respectively provided with a step guide which is capable of drawing back; the step guides are respectively and evenly provided with a plastic slide block, the external side of which extends out of the guide surface, and the plastic slide block, the external side of which extends out of the guide surface, matches with the step guide surface corresponding to the frame of the assembly floor; while assembling, the plastic slide block sliding along guide surface causes the plastic slide block and the plastic slide block to match with each other and to be located. The mortice structure of the invention changes the fastener structure and assembly method of the existing floor, causing no squeezing of the surface decoration layer of floor edge and no edge collapsing of the decoration layer while assembling, being able to adjust the size of the clearance between floors; the fastener of the floor need not differentiate with left and right, and thus free assembly in any end can be done while disassembling, which is convenient for production and assembly; in addition, the plastic fastener has high intensity, saves material and has low cost.

The invention discloses medicament carrying polymer nano particles and a preparation method thereof in the technical field of pharmacy. The medicament carrying polymer nano particles contain medicaments and polylactic acid-methoxy polyethylene glycol (PLA-mPEG) or poly (lactic-co-glycolic acid)-methoxy polyethylene glycol (PLGA-mPEG). The molecular weight of the block polylactic acid (PLA) or the poly (lactic-co-glycolic acid) (PLGA) is 10,000 to 60,000, the molecular weight of the block methoxy polyethylene glycol (mPEG) is 2,000 to 5,000, and the block ratio of the PLA or the PLGA to the mPEG is (60:40)-(90:10). The preparation method of the nano particles avoids the defects of low medicament nano particle entrapment rate and serious burst release caused by using the conventional surfactant, complex removing steps and the like; and the medicament carrying polymer nano particles with high quality are synthesized by simplified processes and with relatively low cost.

The invention relates to a method for preparing microspheres with solid-in-oil-in-hydrophilic oil-in-ethanol, belonging to the field of the pharmaceutical technology and comprising the following steps: (1) adding and stirring or swirling medicament particles to the organic solution, i.e. the oil phase of sustained-release or controlled-release material; (2) adding mixed suspension to another hydrophilic organic solution, i.e. hydrophilic oil phase and stirring the mixed suspension to the hydrophilic organic solution, i.e. the hydrophilic oil phase for 0.1-5 min to form spheres of 1-500 Mum; (3) transferring the mixed suspension containing the microspheres to ethanol and solidifying the mixed suspension for 1-4h; (4) and drying and freezing the sample to obtain the dry microspheres. The diameter of the microspheres can be controlled and adjusted from 1 Mum to 500 Mum according to the need; the microspheres can not cause pollution to the environment; the surfaces of the microspheres aresmooth and round; the microspheres are consistent without being adhered; the frozen-dried powder of the microspheres is white, fine and loose, can not collapse, can not be adhered and has good dispersity. The method can be used for preparing various sustained-release or controlled-release microspheres of various medicament or preparing the adjuvant of vaccines.

The invention provides a construction method of municipal drainage culvert sinking trough. The construction method comprises the following steps: manufacturing a groove-type culvert prefabricated part with a cutting foot at the lower part by adopting the ground or semi-underground cast-in-place segmental method on the construction line of municipal drainage culvert; excavating earthwork in the cutting foot which is at the lower part of the groove-type culvert prefabricated part; sinking the earthwork to a predetermined depth by the own gravity of the groove-type culvert prefabricated part or by external force; manufacturing a culvert base plate by the cast-in-place method between the cutting feet which are at the lower part of the groove-type culvert prefabricated part; backfilling to the height of the original ground surface or road surface with sediments outside the groove-type culvert prefabricated part. Compared with the prior art, the construction technology has the advantages of high rigidity, strong safety, little influence on adjacent buildings and various pipes; the invention further has the advantages that little precipitation and displacement occur on the earth surface; the solidity and durability are better than that of open municipal drainage pipeline construction, and the invention overcomes various drawbacks that the current drainage pipelines with major diameters are not easy to manufacture, transport and construct and are easy to leak.

The invention discloses adriamycin-containing nanometer medicament microspheres, which comprises adriamycin, nanoparticles, a polymer and medicinal auxiliary materials. The invention further provides a preparation method of the microspheres. The method comprises the following steps of: preparing adriamycin and the medicinal auxiliary materials into a nanometer medicament; adding the nanometer medicament into a polymer-containing organic solvent mixed solution for emulsifying; adding a nanometer medicament-in-oil mixed suspension into a water mixed suspension containing nanoparticles or containing nanoparticles and a surfactant for emulsifying to obtain an oil-in-nanoparticle mixed suspension-nanometer medicament-in-oil compound emulsion; and curing the obtained compound emulsion, and centrifugally collecting microspheres. An appropriate polymer material and an appropriate microsphere preparation method are selected, the prepared microspheres have high envelop rate, and a layer of self-assembled nanoparticles on the surfaces of the microspheres has the effects of improving cell adhesion and reducing inflammation and microencapsulation caused by local excessive acid and hydrophobic materials. The method disclosed by the invention can be applied to preparation of other medicament slow release or controlled release microspheres.

The invention discloses a water purification and storage system which comprises a water storage container, cover plates (2) and a permeation preventing wall (3). The water storage container is formed by connecting a plurality of polygonal water filter wells (1) in a tangent mode. The wall of each water filter well (1) is in a water permeating structure. A permeation preventing layer (4) is arranged at the bottom of each water filter well (1). At least one water filter well (1) is a water outlet well (14). The cover plates are arranged at the top of the water storage container and comprise a permeation preventing cover plate (21) arranged at the top of the water outlet well and water permeating cover plates (22) arranged at tops of other water filter wells. The permeation preventing wall (3) is arranged around the water storage container. The water purification and storage system solves the problems that a water storage pool is prone to collapse and low in water storage rate. The water purification and storage system is especially suitable for rainwater collection and purification treatment of rainwater.

The present invention relates to a cancem filling type coal-mining method. Said method includes the following steps: building main shaft, auxiliary shaft, road large tunnel, haulage drift, ventilation drift and setting stope face, and when the coal is extracted, it adopts cavem filling mode, including the following steps: dividing stope face, presetting horizontal drief on the stope face, one-by-one extracting coal form horizontal drift, after every drift is extracted, filling the empty drift with coal gangue, and its filling rate is greater than or equal to 80%.

A peacetime and wartime aboveground and underground automatic house is adopted; in peacetime, natural and man-made disasters can be avoided, for example, the house can descend underground in advance if a typhoon is coming; in case of an earthquake, the house adopts the all-steel-plate structure, cannot be cracked and cannot collapse, and in addition, a well has the relatively thick reinforced concrete layer, so that persons are completely safe; in wartime, 1) the house is hidden underground, and thus a target is relatively difficult to find; 2) multiple medium-thick steel plate and relatively thick reinforced concrete layers are arranged at the top of the house, and the house cannot be destroyed by bombs; 3) concealed channels, car garages and storerooms for person and car underground civil air defense are arranged underground, considerable convenience and timely supply are provided for traffic and provisions, all daily necessities are guaranteed, and the house is warm in winter and cool in summer; and the persons live underground in winter and summer, live aboveground in spring and autumn and can enjoy the climate about 25 DEG C like springtime throughout the year in Northeast or South.

A steel pipe constrained high-strength steel section-concrete column with high axial pressure ratio and high earthquake-proof and fire-proof performance is composed of several longitudinal reinforcing bars, several reinforcing hoops for fixing said longitudinal reinforcing bars, the steel sections in said reinforcing hoops, the steel pipe surrounding said reinforcing hoops and with both open ends, and concrete cast in said steel pipe.

The invention discloses a nitrogen-doped carbon porous hollow carbon catalyst, a preparation method thereof and an application thereof. The preparation method of the catalyst comprises a step of mixing an imidazole substance with zinc salt, adding a mixture of the imidazole substance and the zinc salt into an alcohol solution, stirring to be uniform, and performing standing, filtration and drying,adding obtained solid powder into deionized water, ultrasonically mixing to be uniform to obtain a mixture liquid A, and a step of adjusting the pH value of an organic acid aqueous solution to 7 to 9with a strong base to obtain a mixture liquid B, step of mixing the mixture liquid A and the mixture liquid B, stirring to be uniform, performing centrifugal separation and drying to obtain solid powder adsorbing organic acid anions, then placing the solid powder adsorbing the organic acid anions and an ion liquid into a tube furnace, and performing high-temperature calcining in a high-purity atmosphere to finally obtain the nitrogen-doped carbon porous hollow carbon catalyst. The nitrogen-doped carbon porous hollow carbon catalyst prepared by the invention has high electrocatalytic activityand superior stability, and the verification shows the performance of electrochemical reduction of oxygen by the catalyst of the invention is better than that of commercial platinum carbon.