Construction method of super-long bearing platform expansion joint

The invention discloses a construction method of a super-long bearing platform expansion joint. The construction method comprises the following steps that S1, surveying and lofting are conducted, specifically, a construction position and a size side line are obtained through surveying and lofting; s2, bottom waterproof construction is conducted, specifically, a formwork is installed, and sealant is poured; s3, a first-layer foam board is installed, specifically, the first-layer foam board is installed according to the expansion joint side line; s4, construction of a force transmission structure: mounting multiple layers of force transmission rods, and arranging a bracket; s5, a first-layer water stop belt is installed, specifically, the first-layer water stop belt is installed; s6, a second layer of foam board is installed, wherein the second layer of foam board is installed; s7, top waterproof construction is conducted, specifically, an angle steel assembly is arranged and sealed through sealant, and a secon