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328results about How to "Avoid weakening" patented technology

Hemodialysis and vascular access system

InactiveUSRE44639E1Encourage self sealing and tissue ingrowthAvoid the needOther blood circulation devicesDiagnosticsVenous accessHaemodialysis machine
A hemodialysis and vascular access system comprises a subcutaneous composite PTFE silastic arteriovenous fistula having an indwelling silastic venous end which is inserted percutaneously into a vein and a PTFE arterial end which is anastomosed to an artery. Access to a blood stream within the system is gained by direct puncture of needle(s) into a needle receiving site having a tubular passage within a metal or plastic frame and a silicone upper surface through which needle(s) are inserted. In an alternate embodiment of the invention, percutaneous access to a blood stream may be gained by placing needles directly into the system (i.e. into the PTFE arterial end). The invention also proposes an additional embodiment having an arterialized indwelling venous catheter where blood flows from an artery through a tube and a port into an arterial reservoir and is returned to a vein via a port and a venous outlet tube distinct and distant from the area where the blood from the artery enters the arterial reservoir. The site where blood is returned to the vein is not directly fixed to the venous wall but is free floating within the vein. This system provides a hemodialysis and venous access graft which has superior longevity and performance, is easier to implant and is much more user friendly.
Owner:MERIT MEDICAL SYST INC

Assembly type wood frame structure beam-column joint with sleeve

The invention discloses an assembly type wood frame structure beam-column joint with a sleeve. The assembly type wood frame structure beam-column joint comprises an upper wood column, a lower wood column, wood beams, a sleeve joint and reinforcing corner pieces. A middle vertical inserting groove is formed in the end of each wood beam. A cross-shaped inserting groove is formed in the upper end of the lower wood column, and a cross-shaped inserting groove is formed in the lower end of the upper wood column. The sleeve joint is provided with a column sleeve; a cross-shaped sleeve longitudinal rib plate and a sleeve middle transverse partition plate are arranged in the column sleeve; and wing type sleeve connecting plates are arranged outside the column sleeve. The column sleeve is arranged at the upper end of the lower wood column in a sleeving mode; the lower end of the upper wood column is inserted into the column sleeve; the ends of the wood beams are inserted into the wing type sleeve connecting plates; and the upper side and the lower side of each wood beam are each provided with a reinforcing corner piece. The reinforcing corner pieces, the sleeve joint, the wood beams and the wood columns are connected through bolts. The assembly type wood frame structure beam-column joint is little in wood consumption, low in manufacturing cost, high in connection strength, easy to manufacture, convenient to construct, definite in stress, and beneficial to the population and the application of assembly type wood frame structures.
Owner:TIANJIN UNIV

Argillaceous soft rock roadway partition multi-granularity grouting reinforcement method

The invention provides an argillaceous soft rock roadway partition multi-granularity grouting reinforcement method. A corresponding geological state is evaluated according to geological information data of a specific roadway, drilling points of shallow grouting holes and deep grouting holes are designed in the roadway according to the evaluated geological state, along with tunneling of the roadway, the periphery of the roadway is anchored, and a concrete and silica sol spray layer is arranged; the shallow grouting holes are constructed in the sides and a top plate and a bottom plate of the roadway, hole sealing grouting is carried out, the deep grouting holes are constructed in the pre-designed drilling points of the deep grouting holes, hole sealing grouting is carried out, and therefore grout is effectively sealed and reinforced in a deep virgin rock region. Shallow broken region surrounding rock is reinforced, water molecules, air molecules and crack water are prevented from entering a channel of a jet-grouted solid, the anti-deformation capacity and durability are improved, and the problems that after an argillaceous soft rock roadway encounters water, prominent non-linear large deformation, remarkable rheology and disturbance are generated are solved.
Owner:CHINA UNIV OF MINING & TECH

Steel pipe concrete frame with prestressing tendons and construction method thereof

The invention relates to a steel pipe concrete frame with prestressing tendons and a construction method thereof. The steel pipe concrete frame with the prestressing tendons is formed by connecting composite columns with composite beams through joints. The composite beams are horizontally arranged among the composite columns. The joints are outer sleeving integral type joints internally filled with self-compacting concrete. The composite columns are sectional-type steel pipe concrete composite columns with built-in profile steel. The composite beams are internal-prestress I-shaped steel pipe concrete composite beams. The prestressing tendons arranged in the composite beams bypass joint outer pipes from upper strengthening annular plates with cavities. The prestressing tendons are positioned through single-hole positioning plates and hole-formed double-hole main positioning plates, form symmetrical curve shapes and achieve tensioning and anchoring at joint end beams. The self-compacting fine stone concrete of the composite beams and self-compacting fine stone concrete of the joint end beams are through and form a whole with the joint outer pipes after curing. The problem that beam-column connecting joints of a novel steel pipe concrete frame with prestressing tendons are complex and liable to damage is solved.
Owner:广西万纵建设工程有限公司

Concrete-filled rectangular steel tube column-box girder full-bolt connection node and construction method

The invention belongs to the technical field of building structure engineering, and relates to a concrete-filled rectangular steel tube column-box girder full-bolt connection node. The concrete-filled rectangular steel tube column-box girder full-bolt connection node comprises a concrete-filled rectangular steel tube column, a box girder, an upper run-through clapboard, a lower run-through clapboard, a lower cover plate, a plurality of high-strength bolts, a plurality of connection plates and two shear plates. The upper run-through clapboard and the lower run-through clapboard penetrate through a concrete-filled rectangular steel tube column wall and are welded with the surrounding of the steel tube column wall of the concrete-filled rectangular steel tube column; the two webs of the box girder are welded together with the groove of the concrete-filled rectangular steel tube column via one shear plate respectively; the upper flange of the box girder is connected with the upper run-through clapboard by the high-strength bolts via the connection plates arranged in the box girder; the two webs of the box girder and the two shear plates are connected by the high-strength bolts via the connection plates arranged in the box girder respectively; and one end of the lower cover plate is connected with the lower flange of the box girder via the connection plate, and the other end of the lower cover plate is connected with the lower flange of the lower run-through clapboard via the connection plate. The invention provides a construction method for the node aforementioned simultaneously. The node and the construction method disclosed by the invention have the advantages of being convenient, fast, and easy to realize.
Owner:TIANJIN UNIV

Local reinforcing equipment and method for wind power generator unit foundation ring

The invention discloses local reinforcing equipment for a wind power generator unit foundation ring. The local reinforcing equipment comprises an original reinforced concrete foundation and a local reinforcing device. The local reinforcing device comprises a newly-poured reinforced concrete foundation, inner side steel clamping plate units and outer side steel clamping plate units. The multiple inner side steel clamping plate units are arranged on the inner wall of the upper portion of a foundation ring of the original reinforced concrete foundation in an annular mode, and the multiple outer side steel clamping plate units are arranged on the outer wall of the upper portion of the foundation ring in an annular mode; and the newly-poured reinforced concrete foundation is poured on the original reinforced concrete foundation. According to the local reinforcing equipment for the wind power generator unit foundation ring, loads which are borne by the foundation ring and generated by a draught fan in a running state are dispersedly transmitted through the inner side steel clamping plate units, the outer side steel clamping plate units, connecting steel bars, inner foundation negative bend steel bars and outer foundation negative bend steel bars, stress in the reinforced foundation ring is effectively reduced, fatigue damage to a draught fan foundation is reduced, and the service life period of the reinforced draught fan foundation is greatly prolonged. The invention further discloses a local reinforcing method for the wind power generator unit foundation ring.
Owner:HUNAN UNIV OF SCI & TECH

Hierarchical pore structure silicon-based negative electrode material for lithium battery and preparation method of hierarchical pore structure silicon-based negative electrode material

The invention relates to a hierarchical pore structure silicon-based negative electrode material for a lithium battery and a preparation method of the hierarchical pore structure silicon-based negative electrode material. The preparation method comprises the following steps: using a waste ultrafine silicon dioxide powder material generated in optical fiber production, firstly performing acid pickling and purification on the silicon dioxide powder, then using a water bath method to disperse the purified silicon dioxide powder into deionized water, adding a silane coupling agent, then adding an acid to the solution, further adding a surfactant, stirring, standing, crystallizing, filtering, drying and calcining the crystal at high temperature to form a modified carrier; adding the modified carrier material to an ethanol solution or deionized water, adding silica powder, stirring and dispersing, filtering and drying to obtain the silicon-based material with a mesoporous structure; then adding the purified silicon dioxide powder to a sodium hydroxide solution, performing high temperature autoclave reaction, adding the silicon-base material with the mesoporous structure and a carbon material to the obtained product, then adding an acid solution, washing, drying and calcining at high temperature, and naturally cooling to obtain the silicon-based negative electrode material with the hierarchical pore structure.
Owner:ZHONGTIAN TECH ADVANCED MATERIALS CO LTD

Locating slip support of large-span space structure

The invention discloses a limit gliding bearing of a large-span space structure, comprising a cubic limit box at the lower part of the bearing, an additional gliding plate arranged in the cubic limit box and a plate bearing arranged on the additional gliding plate, wherein, the cubic limit box is composed of a square base plate, 4 limit stop plates at the periphery of the square base plate and 4 small cover plates which cover the 4 corners of the 4 limit stop plates which are all welded together; the plate bearing is composed of a vertical supporting tube which is welded at the middle part of the base plate and 4 cross-shaped vertical supporting stiffening plates which are welded at the periphery of the vertical supporting tube; clearance size of the square base plate of the cubic limit box is larger than the size of the base plate of the plate bearing, and horizontal slip of the plate bearing is the difference between the clearance size of the cubic limit box and the size of the base plate of the plate bearing. In the invention, the plate bearing is allowed to have relatively large horizontal displacement, thus effectively releasing thermal stress, reducing horizontal thrust of the plate bearing on the lower structure of the limit gliding bearing, effectively reducing use amount of steel and lowering construction cost; meanwhile, in the invention, weakening on the base plate of the limit gliding bearing by opening anchor bolt holes is avoided, the structure is simple and the installation is convenient.
Owner:HUNAN UNIV

Comprehensive protecting and treating method of water-containing easily-weathered rock bedding slope

The invention provides a comprehensive protecting and treating method of a water-containing easily-weathered rock bedding slope. The method comprises the following steps that 1, positions of bedding joints, water isolating layers, rock crushing zones and water guide channels are explored and determined on site; 2, steps from the first to the Nth are formed in an exploited manner, a water drainageditch is constructed in the bottom of a slope face, water drainage holes are constructed in the slope face, thus water accumulated in the steps is drained away, and a water intercepting ditch is constructed in the slope top; 3, slurry injecting holes are constructed in the slope face to enable the rock crushing zones to be combined into a whole; 4, mixed clay is used for being laid on the slope top, and then grinding is carried out; 5, short anchoring rods are constructed on the slope face, and the method of full-hole slurry injecting is used for anchoring; and 6, concrete is adopted for carrying out net hanging and slope spraying. According to the method, the stability of the slope is improved fundamentally, contact between easily-weathered rocks and atmosphere, sunlight and water is isolated, weathering damage to slope rock mass is prevented, the strength of the rock mass is given into play, the key effect of the water in slope slippage is eliminated, and long-term stability of the slope is improved.
Owner:NORTHEASTERN UNIV

Heat treatment method for improving mechanical property of austenitic heat-resistance steel

The invention provides a heat treatment method for improving the mechanical property of austenitic heat-resistance steel. According to the heat treatment method, the technological step is simple and effective, operation is easy, cost is low, the microstructure of the austenitic heat-resistance steel can be improved, and the mechanical property of austenitic heat-resistance steel is improved. The heat treatment method comprises the following steps that (1) raw materials are prepared according to the alloy component and the burned value and smelted and poured into alloy ingots under the vacuum environment; (2) the alloy ingots are sequentially subjected to homogenization and heat deforming treatment; (3) alloys after heating deforming are subjected to solid solution heat treatment at the temperature of 1200-1260 DEG C for 25-45 min, and then water cooling is conducted till the temperature reaches the indoor temperature; and (4) intermediate temperate short-term aging treatment is conducted, specifically, the alloys after solid solution heat treatment are heated till the temperature is 750-800 DEG C, heat preservation is conducted for 30-60 min, air cooling is conducted till the temperature reaches the indoor temperature, the austenitic heat-resistance steel is obtained, nano-scale Z phases are obtained in crystals, and M23C6 phases are obtained in crystal boundaries.
Owner:HUANENG POWER INTERNATIONAL +1

Pressure vessel door quickly-opened device with leakage on-line detection function

The invention relates to the field of pressure vessels, and aims to provide a pressure vessel door quickly-opened device with a leakage on-line detection function. The device comprises a barrel flange, a cover flange and a locking clamp, wherein the barrel flange is welded with a vessel barrel, the cover flange is welded with a cover, and the locking clamp is used for fixedly connecting the barrel flange and the cover flange; the flange surface of the barrel flange is provided with three circles of grooves which sequentially include a first sealing groove, a gas detecting groove and a second sealing groove from outside to inside, and a lip-type sealing ring is respectively placed in the first sealing groove and the second sealing groove; and the barrel flange is provided with a gas inlet and a medium sensor, wherein the gas inlet is respectively connected to the first sealing groove and the second sealing groove and used for importing sealing gas, and the medium sensor is communicated to the gas detecting groove. The device disclosed by the invention is convenient to assemble and disassemble, saves the cost, prolongs the service life, and ensures the success rate of vessel sealing; the gas detecting groove can detect the gas leakage of the insides of vessels; and the economic loss caused by suddenly stopping the operation of the vessels can be avoided.
Owner:ZHEJIANG UNIV

Frame-supporting column with high strength steel bars and super high strength concrete

The invention relates to a reinforced concrete frame-supporting column, in particular to a frame-supporting column with high strength steel bars and super high strength concrete. The frame-supporting column overcomes defects that axial compression ratio limits of ordinary reinforced concrete frame-supporting columns and steel reinforced concrete frame-supporting columns are low, protective covers fall easily under earthquake force, longitudinal bars and steel flanges are easy to bend, the columns are difficult to repair after an earthquake, and high strength steel bars and super high strength concrete cannot be applied, and defects that node constructions of steel reinforced concrete and steel pipe concrete frame-supporting columns are complex, the steel pipe concrete frame-supporting columns do not constrain concrete fully, and steel pipes are easy to bend. The frame-supporting column comprises longitudinal high strength steel bars, high strength closed stirrups and self-compaction super high strength concrete; and constraints include that stirrup spacing of concrete protective covers in whole concrete ranges from 30mm to 35mm, outer surfaces are aligned to outer surfaces of concrete frame-supporting columns, and the stirrup spacing of longitudinal high strength steel bars is constrained to range from 60 mm to 120 mm. By aid of constraining of closely-matched high strength welding closed stirrups on the whole concrete, mechanical properties of super high strength concrete are improved, anti-seismic properties of the column are improved, and the frame-supporting column has a wide application prospect in high-rise or super high-rise structures.
Owner:贵州中建伟业建设(集团)有限责任公司
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