39results about How to "Avoid sudden stress" patented technology

The invention discloses a double-tower hybrid beam cable-stayed bridge system. The double-tower hybrid beam cable-stayed bridge system comprises a hybrid beam composed of a concrete beam and a composite beam. The concrete beam and the composite beam are connected through a joint section. The concrete beam is a bilateral ribbed beam and comprises two concrete beam ribs. The composite beam comprises two main steel beams, and the main steel beams are each of an I shape and each comprise a main steel beam top plate, a main steel beam bottom plate and a main beam steel web. The joint section comprises a concrete beam rib-main steel beam connection structure composed of a front pressure bearing plate, a rear pressure bearing plate and a joint section steel web, and the main steel beam top plates and the main steel beam bottom plates stretch into the concrete beam ribs. The double-tower hybrid beam cable-stayed bridge system is reasonable in structural design, convenient to construct, high in construction speed, good in use effect and good in connection effect of a steel-concrete joint part. Meanwhile, the invention further discloses a construction method of the double-tower hybrid beam cable-stayed bridge system. The construction method includes the steps of lower portion supporting structure and main tower construction and hybrid beam construction. The construction method is simple, easy to implement, short in construction period and good in construction effect.

The invention discloses a harvester for leaves of agave sisalana. A lifting frame is movably connected up and down with the front end of a vehicle body, a piston is transversely fixed at the front endof the lifting frame, a piston rod of the piston extends towards one side of the vehicle body, and a harvesting device is fixed at the end part of the piston rod; and the harvesting device comprisesa ring sleeve, a hollow cavity is arranged in the ring sleeve, a groove opening is arranged in the middle of the top surface of the ring sleeve, an annular rod which is in slide connection along the ring sleeve is arranged in the ring sleeve, one side, far away from the piston, of the ring sleeve is provided with a gap A, the annular rod is provided with a gap B, the straight line distance of a gap with a smaller radian in the gap A and the gap B is greater than or equal to the diameter of the stem of the agave sisalana, the top, located at in the range of the groove opening, of the annular rod is inwards provided with cutting knives, and the distance between each cutting knife and the circle center of the annular rod is greater than the radius of the stem of the agave sisalana. Accordingto the above structure, the harvester for the leaves of the agave sisalana provided by the invention realizes mechanized harvesting of the leaves of the agave sisalana, thereby changing the industry rule that the agave sisalana can only be manually harvested, greatly reducing the labor intensity of harvesting of the leaves of the agave sisalana, and improving the harvesting efficiency of the leaves of the agave sisalana.

The invention discloses an additive manufacturing-based product lightweight design method. The method comprises the following steps: 1, establishing a parametric porous structure database, and establishing corresponding relationships between various parametric structures and mechanical property; 2, carrying out finite element analysis on an original product model structure; 3, adjusting a parametric unit structure to satisfy difference demands, for the mechanical property, of different mesh regions in the product; 4, carrying out filling replacement on the regions with excess performance in the products by using a lightweight unit structure; 5, carrying out mechanical property check on a lightweight product structure through finite element analysis. According to the method disclosed in the invention, the finite element analysis and the gradient distribution design of a parametric porous structure are combined, and different lightweight strategies are adopted in allusion to the performance demands of different parts of function parts under the premise of satisfying the mechanical property, so that the reasonable and efficient lightweight design is realized, and lightweight products can be prepared by using an additive manufacturing method.

The invention discloses a steel beam inserted type steel-concrete combined section construction of a composite beam. The construction comprises a concrete beam-composite beam connecting structure connected between a concrete beam and the composite beam, and the composite beam comprises multiple steel beams and concrete bridge deck slabs. Each steel beam is a steel plate beam and comprises an upper flange plate, a lower flange plate and a web plate. The concrete beam-composite beam connecting structure comprises a front bearing plate, multiple rear bearing plates, multiple upper transverse penetrating steel bars, multiple lower transverse penetrating steel bars and multiple combined shearing resistant connecting structures located on the joint of the concrete beam and the composite beam. Each combined shearing resistant connecting structure comprises two upper rigid transition stiffening ribs, two lower rigid transition stiffening ribs, two upper longitudinal stiffening ribs and two lower longitudinal stiffening ribs. Shear nails are arranged on the sections, inserted into the concrete beam, of the upper flange plates and the lower flange plates. The steel beam inserted type steel-concrete combined section construction of the composite beam is simple in structure, reasonable in design, easy and convenient to construct and good in using effect, the connecting effect for constructing and forming steel-concrete joint parts is good, and stress is reasonable.

The invention discloses a multi-section type rubber membrane sealed gasometer. The gasometer comprises a piston truss arranged in the gasometer, and T baffle plates are arranged on the outer layer of the piston truss. The key point is that a fixed pulley is arranged on the top of the gasometer, one end of a steel wire rope is connected with the T baffle plates, and the other end of the steel wire rope moves around the fixed pulley and then is connected with a balance weight. The balance weight is used for balancing the gravity of the T baffle plates, and a phenomenon of pressure jump of a piston during running of the piston is avoided.