Assembly type crawling ladder

Aiming at the problems of long time consumption, high cost and non-environmental protection caused by the fact that a walking ladder and a fixed platform of an overhaul channel are connected in a field measurement, blanking and welding mode during existing bridge overhaul, the utility model provides an assembly type ladder which is characterized by comprising a plurality of ladder bodies which are sequentially connected end to end, the lower end of the upper ladder stand body and the upper end of the lower ladder stand body adjacent to the upper end of the upper ladder stand body are connected with a simply supported beam of the maintenance platform through a connecting piece, the connecting piece comprises a fixed rotating support and an inclined ladder adjustable support, the fixed rotating support is fixedly connected with the simply supported beam, and the inclined ladder adjustable support is fixedly connected with the simply supported beam. The inclined ladder adjustable supports are connected with the