Large-span comprehensive canal concrete pouring machine truss lifting and lowering device

The utility model relates to a joist frame type ascend and drop device in concrete pouring machine for big span and integration type channel. The ascend and drop device is composed of a thread bar mounted on the joist frame walking apparatus at two ends of the main joist frame and a threads bar sleeve fixed and sleeved on the main joist frame. The thread bar sleeve is connected with a driving device consisting of a motor and a worm wheel thread bar unit. The utility model can neatly adjust the slop and the thickness of the poured concrete of the novel pouring machine. Therefore a plurality of arranging equipments are not only saved and the workers of the pouring concrete are minimized but also the device is benefit to the mechanization of the channel concrete construction, to the protection of the avoiding leakage and the instant temperature structure layer at the bottom of the channel and to ensure the construction quality of the pouring concrete.