Construction method of tunnel foundation pit penetrating non-navigable river channel

The invention discloses a construction method for a tunnel foundation pit penetrating a non-navigable river channel. The construction method comprises the following steps of (1) backfilling a river channel; (2) constructing retaining piles; (3) paying off and excavating; (4) constructing a lower crown beam and a bottom plate; (5) placing a pipeline; (6) constructing an upper crown beam; (7) pouring concrete; (8) introducing water into the pipeline; (9) secondary backfilling the river channel; (10) constructing the retaining piles; (11) excavating a foundation pit; (12) constructing a tunnel; (13) backfilling the foundation pit; and (14) water drainage. The construction method has the advantages that the river channel is backfilled twice, a flow guide pipe is arranged in the first backfilling process, water flow conduction is achieved, a flow guide channel does not need to be additionally arranged, and therefore the construction amount is reduced, and the construction efficiency is improved. 本发明公开了一种穿越非通航河道的隧道