3results about How to "Increase bending moment" patented technology

This invention discloses a hollow slab bridge pavement structure and construction method, applicable to the design and construction of hollow slab bridge pavement layers. The structure is characterized by comprising three parts: bridge deck pavement, self-stressing ribs, and anchoring bars. Three self-stressing ribs are transversely arranged at L / 4, L / 2, and 3L / 4 within a span of the bridge pavement. Under the action of these three transverse self-stressing ribs, the rigid connection of the hinge joints between the hollow slabs in the bridge superstructure is strengthened, the transverse bending moment transmission of the hinge joints is increased, and the transverse stiffness of the bridge is improved, thereby extending the bridge's service life. Compared with transverse prestressing reinforcement of the bridge superstructure at the bottom of the bridge slab, self-stressing ribs have advantages such as uniform stress distribution, strong bonding with the hollow slabs, reasonable stress distribution, simple process, low cost, and environmental friendliness.

The utility model relates to the field of aircraft body structures, and provides a truss type aircraft cargo hold floor structure and an aircraft, the cargo hold floor structure comprises a fuselage frame, a truss, a floor cross beam, fuselage frame connecting nodes, floor cross beam connecting nodes and a floor; the floor beams are arranged on the upper portion of the machine body frame, and the two ends of each floor beam are fixedly connected with the machine body frame. The truss comprises a plurality of stand columns, one ends of the stand columns are connected with the fuselage frame through fuselage frame connecting nodes, and the other ends of the stand columns are connected with the floor cross beams through floor cross beam connecting nodes. The stand columns can rotate around the fuselage frame connecting joints or the floor beam connecting joints. A triangular structure is formed between every two adjacent stand columns and the machine body frame or the floor beam. According to the utility model, the assembly process is simplified, and the production efficiency is improved. And the connecting rotating shafts are adopted at the connecting positions of the truss, the fuselage frame and the floor cross beam, so that the connecting positions only transmit tension and compression loads, and the situation that the positions are insufficient in connection due to large bending moment of the bottom frame is avoided.