7 results about "Specific weight" patented technology

The utility model relates to the technical field of constructional engineering, and particularly discloses an assembly type component hoisting and positioning device which comprises a moving assembly, a lifting assembly and a positioning assembly. The lifting mechanism comprises a lifting assembly and an adjusting assembly which are mounted on the mounting box, and the adjusting assembly can drive the lifting assembly to rotate; by starting the driving piece, the output end of the driving piece can drive the two-way ball screw to rotate, so that the two sliding blocks are driven to stably move towards or away from each other along the thread track of the two-way ball screw, and the sliding blocks stably slide on the supporting frame through the T-shaped blocks, so that the two lifting hook bodies are pulled to synchronously move; the distance between the two lifting hook bodies can be conveniently adjusted according to the specific weight and shape of a lifted component, so that the lifting hook bodies can be uniformly stressed, the stable state of the component in the lifting process is effectively maintained, shaking is reduced to the maximum extent, and the lifting safety and stability are improved.

The present invention relates to a cementitious tile adhesive composition comprising biochar in a specific weight ratio to the cementitious binder or, where the cementitious binder comprises slag, in a specific weight ratio to slag. The present invention also relates to the preparation method of a cementitious tile adhesive composition with a reduced carbon footprint, especially a carbon-negative cementitious tile adhesive composition.

The application discloses a tunnel lining load determination method, system, equipment and medium, and comprises the following steps: acquiring basic design parameters of a subway tunnel; the basic design parameters of the subway tunnel comprise a tunnel outer diameter, a tunnel buried depth, a specific weight of surrounding rock soil, a friction angle of the surrounding rock soil and a cohesion of the surrounding rock soil; determining a design included angle between a tunnel strike line and a ground fissure strike line; calculating an equivalent coefficient of a surrounding rock soil rupture angle on both sides of the tunnel and the surrounding rock soil rupture angle on both sides of the tunnel according to the basic design parameters of the subway tunnel; calculating external force exerted by the surrounding rock on both sides of the tunnel on the subway tunnel lining when the ground fissure is active according to the surrounding rock soil rupture angle on both sides of the tunnel; and obtaining the maximum load of the subway tunnel lining according to the external force exerted by the surrounding rock on both sides of the tunnel on the subway tunnel lining. The application fully considers the influence of the ground fissure activity on the subway tunnel, determines the maximum lining load required in the subway engineering design crossing the ground fissure, and ensures the structural safety of the subway tunnel.

The application discloses a manganese steel material and a preparation method and application thereof, and belongs to the technical field of steel castings. The manganese steel material is prepared by limiting the specific weight percentage of the composition components in the manganese steel material and optimizing the heat treatment process of the manganese steel material, and the manganese steel material has a light weight, high-temperature wear resistance and a structure of fine austenite+dispersion distributed carbide or fine austenite+fine ferrite+dispersion distributed carbide. The manganese steel material has excellent high-temperature wear resistance at <=800 DEG C, and has a good practical prospect.

A weather strip with a low specific weight and a low water absorption index is provided. The weather strip to be attached to a car includes a hollow sealing portion with a hollow space formed inside, and the hollow sealing portion includes a foamed wall portion that is at least part of a wall forming the hollow space, which has bubbles formed inside, the number of bubbles being not less than 200 / mm2, at least some of the bubbles originating from a thermally expandable microcapsule, which has a thickness of not less than 1.0 mm and not more than 2.0 mm, and which has a specific gravity not greater than 0.45.

The invention discloses a corrosion-resistant and wear-resistant suspender and a heat treatment method thereof, and belongs to the field of boiler parts and metal heat treatment. In order to solve the problems that an existing suspender is insufficient in molten salt corrosion resistance and particle washing resistance, uneven in large section performance and short in service life, low alloy components with specific weight percentage are designed, the low alloy components comprise 0.18-0.28% of C, 3.00-5.00% of Cr, 0.80-2.00% of Ni, 0.15-0.35% of V, 0.0010-0.0035% of B and the like, normalizing, austenitizing at the temperature of 870-910 DEG C, salt bath isothermal quenching at the temperature of 360-410 DEG C and tempering at the temperature of 500-560 DEG C are adopted, and a complex-phase structure with lower bainite as the main part is obtained. The hanger rod is remarkably improved in corrosion resistance and wear resistance, uniform in large-section performance, capable of prolonging the service life to 8-12 years, less than or equal to 20% in cost increase, compatible with an existing production line, suitable for hanging a boiler heating surface tube bundle, and outstanding in economic benefit and environmental protection benefit.

The application discloses a calculation method of uplift bearing capacity of a shallow-buried rigid pile foundation, and comprises the following steps: S1, determining the specific weight gamma, internal friction angle phi and cohesive force c of the rock-soil body in the pile foundation buried depth range; S2, calculating the limit shear stress tau of the rock-soil body vertical fracture surface at different depths xz ; S3, calculating the shear stress of the rock-soil body at different depths; S4, calculating the shear force of the rock-soil body at different depths; and S5, adding the shear forces at different depths to obtain the foundation limit uplift bearing capacity T uk . According to the soil mechanics principle, the limit equilibrium theory of the rock-soil body is utilized, the shear strength of the rock-soil body under the uplift limit equilibrium state is derived from the basic physical and mechanical parameters of the rock-soil body, and then the uplift bearing capacity of the foundation is calculated from the shear strength. The uplift bearing capacity of the upper soil body is fully considered, which is favorable for accurately designing the foundation size and avoiding unnecessary waste.