| Strand selection and adjustment of the fixed |
Fixed on the strand selection and adjustment:
(1) beam length, number of holes to comply with the design or construction programs and the actual length of the tension anchor holes;
(2) strand of the bundle number calculated design: drawing a given weight / length = number of beams, according to the calculation of the beam to apply a similar number of fixed, if the calculation of beam number and the number of fixed beams is not the same, you need to be fixed adjustment;
(3) per ton beam to be adjusted to the number of design drawings for a given number of beams, such as: design of a strand length 16m, diameter = 15.24mm (7φ5) and 7 holes of the anchor strand, strand unit weight of 1.102Kg / m, then: 1000Kg / (7 * 16 * 1.102) = 8.102 beam, apply the quota 4068022 (strand beam-beam long 20m7 hole every t11.65),11.65-8.102 = 3.448 beam, so the need the fixed adjustment :4068022-23 * 3.448;
(4) Another example: X longitudinal prestressed box girder bridge strand of φ15.24-19, that is, each beam 19 shares 7 wire, a total of 240 bundles. Total length of 8106.2m, the total weight of 169419.6Kg, the strand bundle per ton = 240 / 169.42 t = 1.417 beam / ton, the average design beam length = 8106/240 = 33.775m, consider the construction of the tension length, fixed for the selection of : 4,068,036 (each strand bundle long 40m19 hole t2.05 beam), adjust the volume :2.05-fixed 1.42 = 0.63, adjusted to scale: 4068036-4068037 * 0.63.
As tender documents for a given strand number and the number of anchor, it is easy to calculate: the number of each beam t = anchor strand bundles (sets) / 2 / strand (t), then you can set a fixed |
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