Technical Advances of Temporary Facilities for the Failure Prevention of Large-Span Cantilever Casting Construction of Mountainous Concrete Box-Type Arch Bridges

Figure 3

Force transmission rules of the inverted triangle form traveller. HC (i), WP (i), and TB (i) denote the spreader beams in the horseshoe chamfer area, web plate area, and top and bottom plate area in the no. i case ((i) = 1–5), respectively. Cases 1 to 5 denote the cantilever box-girder segment loading of no. 2, no. 4, no. 13, no. 15, and no. 17 with the dip angles of 31.94, 27.83, 9.88, 6.17, and 2.52 degrees, respectively. (a) 3D view of the form traveler. (b) Profile (unit: mm). (c) Plane (unit: mm). (d) Numbering of the spread beams (unit: mm). (e) Typical cross-section (unit: cm). (f) Numbering of the segments (unit: cm). (g) Force distribution on the spread beams. (h) Constraint release of the FE model.

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