Abstract:

The existing formworks for invert casting have such disadvantages as high weight, difficult installation, complex invert construction procedure, difficult in onetime casting of the invert and the side wall foundation and high investment cost. Taking the construction of the exit section of Xiamao tunnel on XiangtangPutian Railway as an example, the author has developed a new arcshaped composite steel formwork after detailed studies, which has overcome the disadvantages of the existing formworks. Furthermore, the author presents the design and fabrication of the new formworks, as well as the fullbreadth casting of the invert with the new formworks.

Key words: high speed railway, tunnel, invert, new arcshaped composite steel formwork