ABSTRACT
Compared with China, Japan did more diaphragm walls in civil engineering especially in the fields of bridge constructions. Japanese different method of work was that the diaphragm wall was used for lower part of bridge foundation which was called diaphragm wall foundation to bear the upper load. In China, the first method of work like this was an over line bridge in state road 209 line in Shanxi Province. In this paper we would introduce the second diaphragm wall foundation in Yanhe River Bridge in Shaanxi Province. Both of the two bridges were in the northwest of China. This area was Chinese loess area. Loess had the good orthostatic characteristics. The horizontal bearing capacity of the bridge foundation was the control target in this area. Connecting the single diaphragm wall into closed diaphragm wall foundation with structural connector could obtain large horizontal bearing capacity. The common used types of closed diaphragm walls foundation were in Figure 1. The internal space of the closed diaphragm wall foundation could be filled by soil or concrete.
