Large size selected expansion joints of the selected size and service life, should be considered in the design of rich enough. When the telescopic margin bridge displacement direction and the center line of the orthogonal expansion joints, expansion joints selection specification is relatively easy, but the direction and displacement of bridge expansion joint center oblique, must be decomposed into parallel and perpendicular to the center line of the two vectors, the expansion joint specification depends on two vector one. And vector parallel seam: Delta Lp= and delta L.cos beta; vector joint vertical: Delta Lr= Delta Lr.sin beta type: said the total deformation of bridge displacement; displacement direction and the direction of the joint payAngle to 135 degrees Lr =45 Eve joy is the selection of expansion joint specification, deformation of delta Lp is generally composed of rubber sealing strip moving old wrong level, without too much influence on the expansion joint.
Selection criterion of bridge expansion joint:
Example: the design of bridge structure displacement along the center line of the 95mm, with its 40 degree oblique joints, calculated according to the formula of delta Lr=73mm, Delta Lp=61mm used this model is suitable for telescopic seam。 At the same time to note that the strip in the middle as quasi maximum horizontal momentum in the wrong direction before and after the two should not exceed 40mm if the calculation is found in excess, dislocation and expansion must choose a larger size seam。 The design, such as a sidewalk, structure proof wall, must be the point of view of design, size data is provided to the factory, to facilitate the overall manufacturing plant according to the design requirements。