Leakage detection method for laying new bottom plate in gas holder

The invention provides a leak detection method for laying a new bottom plate in a gas holder, and relates to the technical field of metallurgical gas, and the method comprises the following steps: 1, after the gas holder is overhauled and the new bottom plate is laid, filling a gap between an old bottom plate of the gas holder and a side ring of the new bottom plate with an expanding agent for sealing, and enabling the new bottom plate, the old bottom plate and the expanding agent to form a relatively closed space; 2, two holes are formed in the opposite angles of a new bottom plate of the gas chamber, one hole is provided with a compressed air access pipe, the other hole is provided with a U-shaped pressure gauge, and a compressed air valve is opened to fill compressed air pressure into the relatively closed space between the new bottom plate and the old bottom plate; according to the method, the old bottom plate and the new bottom plate which are not dismantled are used, the gap between the edge rings of th