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9712 results about "Bearing capacity" patented technology

In geotechnical engineering, bearing capacity is the capacity of soil to support the loads applied to the ground. The bearing capacity of soil is the maximum average contact pressure between the foundation and the soil which should not produce shear failure in the soil. Ultimate bearing capacity is the theoretical maximum pressure which can be supported without failure; allowable bearing capacity is the ultimate bearing capacity divided by a factor of safety. Sometimes, on soft soil sites, large settlements may occur under loaded foundations without actual shear failure occurring; in such cases, the allowable bearing capacity is based on the maximum allowable settlement.

Prefabricated assembly type shear wall vertical slit connecting structure and construction method thereof

ActiveCN105484388ADelayed local bucklingLocal buckling reinforcementWallsPre embeddingShear wall
The present invention provides a prefabricated assembly type shear wall vertical slit connecting structure which comprises a left side shear wall, left side pre-embedded profile steel, a right side shear wall, right side pre-embedded profile steel, and a plurality of split bolts. The left side pre-embedded profile steel and the right side pre-embedded profile steel are disposed between the left side shear wall and the right side shear wall and have the same structure. The left side pre-embedded profile steel comprises a side plate, a front side plate and a rear side plate, the front side plate and the rear side plate are disposed at front and rear positions of the side plate, each of the front side plate and the rear side plate is inwardly provided with a groove, and the grooves are provided with a plurality of bolt holes. The split bolts are disposed in the bolt holes to lock and fix the left side pre-embedded profile steel and the right side pre-embedded profile steel. The present invention also provides a construction method of the prefabricated assembly type shear wall vertical slit connecting structure. The connecting structure is high in bearing capacity, high in stiffness, good in seismic ductility, excellent in integrity, convenient in construction and good in construction quality, and concrete is effectively restrained.
Owner:FUJIAN UNIV OF TECH

Steel tube-I beam combination steel tube concrete special-shaped columns and manufacture method thereof

InactiveCN102587577AOvercome deficienciesOvercoming the lack of restraint abilityStrutsBuilding material handlingSheet steelShock resistance
The invention relates to steel tube-I-beam combination steel tube concrete special-shaped columns, which comprises steel tubes, I-beams and concrete poured inside the special-shaped columns. The steel tubes and the I-beams are welded together to compose the special-shaped columns with different sections. The whole sections are separated through the steel tubes and the I-beams, then the concrete is filled in separation spaces of the steel tubes and the I-beams, the steel tubes can be made by welding or rolling, and the I-beams can be made by welding or rolling. The steel tube-I-beam combination steel tube concrete special-shaped columns have the advantages that inside corner steel tube walls and I-beam flange steel plates are communicated with each other so as to overcome the defect that force delivery of inside corner portions of other steel tube concrete special-shaped columns is unclear, and whole working capacity of steel tube concrete special-shaped columns is improved. The steel tubes are placed at the edges and at corner portions of the sections so as to improve restrain capacity of the special-shaped columns. The steel tubes and the I-beams separate the concrete of the special-shaped columns, width-to-thickness ratio of the steel plates is reduced, bearing capacity and shock-resistance are improved, production and assembly of the special-shaped columns are modularized, and simultaneously construction speed is fast.
Owner:TIANJIN UNIV

Steel-concrete composite beam adopting corrugated steel web and construction method thereof

The invention discloses a steel-concrete composite beam adopting a corrugated steel web, which relates to a corrugated steel web composite beam capable of being applicable to highway bridges and railway bridges. The beam comprises a top flange concrete composite plate, a corrugated steel web plate, a top flange steel plate, a box beam bottom plate and male pin connecting pieces, wherein the top flange comprises a precast concrete slab and a cast-in-place concrete layer; and the top flange concrete composite plate is connected with the top flange steel plate into a whole through the male pin connecting pieces welded on the top flange steel plate. By adopting the structure, the problems that the site workload and the construction difficulty for casting a bottom flange concrete slab of a traditional corrugated steel web composite beam are large, the construction quality is difficult to guarantee and the like are overcome on the premise that the quantity of steel is hardly increased, meanwhile, the tensile property of the steel plate is fully played, the bearing capacity, the rigidity and the cracking resistance of the structure are improved, and the durability of the structure is improved, therefore, the corrugated steel web composite beam has the advantages of simple structure, reasonable stress, quick and convenient construction, and good technical and economic benefits.
Owner:TSINGHUA UNIV

Small high-speed five-axis linkage machine tool

The invention discloses a small high-speed five-axis linkage machine tool, which comprises a foundation structure, a spindle box component and a cradle type worktable. The spindle box component is supported on the foundation structure, and a crossbeam with a frame-shaped structure is arranged on two upright columns to form a bridge-type portal structure. The torque bearing capacity of the crossbeam is improved, the small high-speed five-axis linkage machine tool has all advantages of a five-axis linkage machine tool in the prior art, and carries identical machining reacting force, the volume of a structural part is reduced, and the weight of the structural part is greatly lightened; a spindle box is positioned between two transverse rods of the frame-shaped crossbeam, overturning moment is eliminated, and the stability of the machine tool can be guaranteed; in addition, sizes of various components are greatly reduced on the premise of identical machining capacity, and the stroke of the machine tool can be large in the design; and by the aid of the structure, the machining precision is greatly improved, the machining range is greatly expanded, better dynamic characteristics and higher feeding speed and higher cutting speed can be realized, cutting and machining time is greatly shortened, better surface machining quality is obtained, and machining efficiency is enhanced.
Owner:CHONGQING UNIV

Bridge field static load test evaluation method

ActiveCN104933285AEffective and comprehensive assessmentImprove securitySpecial data processing applicationsElement modelEvaluation Interval
The present invention relates to a bridge field static load test evaluation method, which is mainly a method for evaluating the bearing capacity and adaptation performance of a bridge by means of a field static load test. The method comprises the following steps: (1) determining specific content and method for collecting relevant data for early stage preparation work; (2) establishing a reasonable and accurate bridge structure finite element model according to the collected data; (3) calculating and analyzing a result according to an endogenous force and a stress of the bridge under dead and live loads, and determining theoretical force bearing safety and live load force bearing characteristics; (4) in combination with a traditional key section of the bridge, determining a bridge test section and completing static load test solution designing; (5) performing the field static test for the bridge and processing the test data; (6) studying an evaluation interval corresponding to a preset test evaluation indicator; and (7) making a reasonable and comprehensive assessment on the structural performance of the bridge. The evaluation method and indicator according to the present invention can more effectively indicate the practical bearing capacity and applicability of the bridge in a refined manner, and improving the reasonability and accuracy of the evaluation result.
Owner:SOUTHWEST JIAOTONG UNIV

Floating auxiliary roller type overrun clutch

The invention discloses a floating auxiliary roller type overrun clutch which comprises an outer ring, an inner ring, rolling bodies and auxiliary rollers, wherein engagement spaces used for being engaged with or separated from the rolling bodies are formed between the outer ring and the inner ring; the auxiliary rollers are parallel to an axial line of the overrun clutch and are spaced from the rolling bodies; and the auxiliary rollers are arranged between the rolling bodies in such a way that the auxiliary rollers can move in a circumferential direction of the overrun clutch. According to the floating auxiliary roller type overrun clutch, the processing of a limiting seat is avoided, the processing process is simplified, the working efficiency is improved, and the processing cost is reduced; as the auxiliary roller structure is adopted, the axial length of the overrun clutch and the rolling bodies can be theoretically infinitely prolonged, the engagement length is prolonged, the bearing capacity of the overrun clutch is increased, the radial size of the overrun clutch under higher bearing capacity is reduced, and the service life of the overrun clutch is prolonged; and meanwhile, the probability of imbalance caused by application of a pretension force to point contact of each roller in the prior art is removed, thereby enabling each roller to keep parallel to the axial line of the inner ring.
Owner:SOUTHWEST UNIVERSITY

Construction method of drilling follow casting pile used for building or bridge foundation

A method for constructing pipe piles while drilling for building or bridge foundations. The construction steps are to cover high-strength prestressed concrete pipes or steel pipes with drill pipes on the ground first, and install impactors and reaming retractable drill bits at the front ends of the drill pipes. , Follow the pipe while drilling, follow the pipe retaining wall, drill to the design elevation, stop drilling, withdraw from the reaming to shrink the drill bit, use the mud pump to clean the mud and sediment, pour concrete into the pipe, and simultaneously inject pressure grout to the outside of the pipe wall , stop when concrete and grout reach the ground; the object of the invention is to propose a construction method with fast construction speed, reliable quality, less material consumption, high bearing capacity of piles, mechanized operation, and environmental protection. In the construction method of bored cast-in-place piles, the use of mud retaining walls pollutes the environment, the hole is easy to collapse during the drilling process, the quality of concrete pouring is unstable, and the prestressed pipe piles are easy to cause the soil to rise. The strength of the pile body constructed by the invention is high. , There is no sediment at the bottom of the pile, and the pile end is completely rock-socketed, which can reach more than 2 times the bearing capacity of the same diameter bored pile.
Owner:GUANGZHOU INSTITUTE OF BUILDING SCIENCE CO LTD +1

Coupled four-freedom-degree parallel connection vibration isolation platform

A coupled four-freedom-degree parallel connection vibration isolation platform mainly comprises an upper platform, a lower platform, four main part branches and a middle constraint branch, wherein the four main part branches are identical in structure and used for connecting the upper platform and the lower platform. The tails of actuators of the main part branches are connected with the lower platform through universal joints, telescopic rods of the actuators are connected with the upper platform through ball joints, one end of a lower connecting rod in the middle constraint branch is connected with the lower platform through a universal joint, the other end of the lower connecting rod is connected with an upper connecting rod in a bell socket mode to form a sliding pair, namely the upper connecting rod can expand and retract in the lower connecting rod, the upper connecting rod of the sliding pair is sleeved with a spring, the other end of the upper connecting rod is connected with the upper platform through a rotating pair, and the axis of the rotating pair is parallel to one axis of the universal joint in the middle constraint branch. Lower hinge points of the four main part branches are symmetrically arranged in a square shape, upper hinge points are arranged in a trapezoid shape, and the trapezoid is symmetrical about the axis of a rotating pair of the middle constraint branch. The coupled four-freedom-degree parallel connection vibration isolation platform is simple in structure, large in bearing capacity and good in dynamic response characteristic.
Owner:YANSHAN UNIV

Three-dimensional isolation device

InactiveCN101761147ASufficient vertical bearing capacityAppropriate vertical load capacityShock proofingVibration controlUpper joint
The invention provides a three-dimensional isolation device, which belongs to the field of the vibration control of a civil engineering structure. The three-dimensional isolation device is characterized by mainly comprising a lead-laminated rubber shock isolator, a combined disc spring, a guiding shaft of the combined disc spring, a diamond steel plate damper and the like, wherein the lead-laminated rubber shock isolator is positioned at the lower part of the device, and a lower joint plate and a middle joint plate of the device are both fixed with a slide guide, a slide block and a crossed high-strength cable respectively; a fixed steel plate at the lower end of the guiding shaft of the disc spring is fixed on the middle joint plate by a bolt, the compound combined disc spring is sleeved on the guide shaft and the top end of the guide shaft is provided with an anti-pull baffle and an anti-pull bolt; and the diamond steel plate damper is positioned horizontally, and the two ends thereof are supported on a steel plate support bracket which is fixed on a fixed steel plate of the guiding shaft of the disc spring, and the middle of the diamond steel plate is fixed on an upper joint plate of the three-dimensional isolation device by a screw and a nut. The three-dimensional isolation device has enough vertical bearing force and provides proper vertical and horizontal rigidity and dampness; and key parts are connected reliably and horizontal limiting and vertical anti-pull measurements are provided.
Owner:DALIAN UNIV OF TECH

Undersea suction anchor

The invention discloses an undersea suction anchor which comprises a main drum, a top face of the main barrel is sealed, a lower end of the main barrel is opened, and a main barrel drainage hole is arranged on the top face of the main drum. The undersea suction anchor is characterized in that a barrel skirt is movably sleeved on the main drum, the barrel skirt comprises a horizontal top face and a barrel-shaped lateral wall, a barrel skirt drainage hole is formed in the horizontal top face of the barrel skirt, a telescopic hook locating the barrel skirt at the upper portion of the main barrel is arranged on the barrel-shaped lateral wall at the upper portion of the main barrel, an anchor ring concentric with the main barrel is arranged at the upper end of the main barrel, anchor branches are evenly arranged on the anchor ring, one ends of the anchor branches are hinged to the anchor ring, and the other ends of the anchor branches are hinged to the barrel skirt through inclined support rods. The whole vertical section of the suction anchor is in an umbrella shape, in the sinking process of the anchor body, along with landing-on-seabed of the barrel skirt, the anchor branches are driven by the inclined support rods to be gradually opened, and after the main barrel sinking is finished, the anchor branches cling to the surface of the seabed in a horizontal extending mode. The undersea suction anchor can improve the integral stability of the suction anchor, increases pulling resistance and horizontal bearing force, and reinforces wave-corrosion-resistance performance.
Owner:OCEAN UNIV OF CHINA

Precession-type backfill grouting ground source thermal energy conversion precast pile device and method for embedding precast pile device into stratum

The invention discloses a precession-type backfill grouting ground source thermal energy conversion precast pile device, which comprises a plurality of precession-type backfill grouting prefabricated screw piles respectively embedded into pile holes, wherein a vertical heat exchanger is embedded in each screw pile; the inlet end and the outlet end of each vertical heat exchanger respectively extend out of an opening at the upper end of the screw pile to be respectively connected with a horizontal liquid-feeding collecting pipe and a horizontal liquid outlet collecting pipe in a bearing platform or a cushion layer; centring brackets are arranged at an interval of 1-3 m along the length direction of each vertical heat exchanger; each precession-type backfill grouting prefabricated screw pile comprises a hollow pile core, wherein the bottom of the pile core is provided with a cone-shaped pile head; a screw blade is arranged on the position far away1-3m from the lower part of the outer wall of the pile core; and a post grouting reinforcing layer is poured between the middle upper part of the outer wall of the pile core and a pile hole wall. The precession-type backfill grouting ground source thermal energy conversion precast pile device comprises a plurality of precession-type backfill grouting prefabricated screw piles, and the vertical heat exchanger is embedded in each screw pile; the pile foundation construction and the ground source heat pump construction are integrated so as to avoid a drilling and pipe-laying program of a ground source heat pump system on the ground, greatly lower the front-end investment cost and save the land use area; and the post grouting reinforcing layer is poured between the middle upper part of the outer wall of the pile core and the pile hole wall so as to enlarge a heat conduction area, improve the heat conduction performance and simultaneously improve the pile body bearing capacity.
Owner:CHINA JINGYE ENG +2

Shaft sealing device with magnetic fluids

InactiveCN102537367AReduced seal pressureAutomatically adjust the coaxialityEngine sealsRubber ringMagnetic poles
The invention relates to a shaft sealing device with magnetic fluids, which is characterized in that based on an existing shaft sealing device with magnetic fluids mainly comprising a rotating shaft, a non-magnetic metal shell, magnetic poles, a permanent magnet, the magnetic fluids and a rubber ring, sealing pole teeth made of soft magnetic materials are additionally arranged in sealing pole tooth grooves of the magnetic poles, a sealing pole tooth ring is sleeved on the rotating shaft, the inner diameter of the sealing pole tooth ring is 0.1-0.6mm larger than the diameter of the rotating shaft, the outer diameter of the sealing pole tooth ring is 0.1-0.3mm smaller than the inner diameter of each tooth groove, the thickness of the sealing pole tooth ring is 0.1-0.3mm smaller than the width of each tooth groove, the magnetic fluids are distributed in an annular sealing gap between the rotating shaft and the sealing pole tooth ring, and each magnetic pole comprises two half annular magnetic poles. The positions of the sealing pole teeth of the device can be changed radially along the rotating shaft to adjust coaxiality of the rotating shaft and the sealing pole teeth, uneven distribution of the annular sealing gap in the circumferential direction of the rotating shaft is decreased, reduction of the pressure bearing capacity of the device and abrasion of the rotating shaft and the sealing pole teeth are avoided, and the requirements of sealing components on machining and mounting precision are lowered.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
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