Larsen steel sheet pile water cofferdam closing structure and operation method

The invention discloses a Larsen steel sheet pile water cofferdam closing structure and an operation method, and relates to the field of bridge construction. The structure comprises a structural pile,a cofferdam pile, a closing gap, a closing structure and the like; the closing structure consists of reinforcing piles drilled on the outer side of the closing gap and with a certain gaps and numbers, steel plates and rubber plates for closing gaps, reinforcement cages for positioning the rubber plates, and fillers, overcomes the problem of low cofferdam structural strength caused by the closinggap of a Larsen steel sheet pile cofferdam in water engineering structural construction, and guarantees the construction safety; the structure is simple in construction, prominent in water stop effectand high in operation efficiency; after construction is finished, the closing structure and the cofferdam piles are dismounted at the same time for recycling, so that the raw materials are saved, andenergy conservation and emi