2 results about "Tension stress" patented technology

The invention relates to a reinforcing and repairing measure for existing concrete box girder bridges, and discloses a method for actively reinforcing a large-span concrete box girder bridge web plate, comprising the following steps: (1) according to the structural parameters of the concrete box girder bridge and by adopting a structural analysis method and corresponding general or special analysis software, a finite element model of a simulated reinforced plate shell concrete box girder bridge is established, thus obtaining the magnitude of the main pulling stress, the vertical stress, the longitudinal stress and the shearing stress of the box girder web plate before reinforcement and the distribution rule thereof; (2) the difference between the main pulling stress and the limited value allowed by the 'Standard' is compared to obtain the target increment value of the vertical stress of the bridge girder, and the actual reinforcement parameters are determined according to the target value; (3) drilling is carried out on the upper margin and the lower margin of the concrete box girder web plate, steel strands are installed and transversally stretched; (4) a wedge block A is used for jacking up the steel strands, then a jack is used for jacking up and pulling the steel strands to the allowed tensioning force, and the steel strands are tensioned one by one; and (5) crack is mended.

The invention discloses an excessive-filling preventing horizontal heat-insulating gas bottle. The excessive-filling preventing horizontal heat-insulating gas bottle comprises a front sealing head assembly (2), an inner cylinder (3) and a rear sealing head (4) which form an inner liner (1), and is characterized in that a compartment (5) is arranged on the upper portion of an inner cavity of the inner liner (1), and a small hole (6) is formed in the bottom of the compartment (5), and the small hole (6) is located in the upper side of the horizontal plane where the horizontal central axis of theinner liner (1) is located. The height of the horizontal plane where the small hole of the compartment is located is effectively increased, so that non-excessive filling is achieved when residual liquid phase media exist; for the horizontal heat-insulating bottle gas, the problem that excessive filling of an existing structure gas bottle is likely to occur when the arbitrary residual liquid phasemedia exist can be well solved; when the compartment is welded to the top of the liner, the advantage that a connecting weld joint bears uniform tensile stress and accordingly has the good force bearing condition is achieved; and the excessive-filling preventing horizontal heat-insulating bottle has the advantages that the structure is simple, the processing technology is simple and convenient, and the manufacturing cost can be saved, and is suitable for being used and popularized.