In the dredging and reclamation project of the Ram Port in Kenya,temporary dredging construction is required in the landfill area. The local stone material is expensive and it is a lack of sand source.Therefore,sand can only be prepared through underwater sand-taking by the large-scale cutter suction dredger.But soil in the construction area is clay mixed with sand and contains a large number of shells.Moreover,the sand layer is thin,so the sand-taking efficiency is extremely low. So,we develop a sand filter device for pipelines,which can separate sand from other waste soils and separately fill them into different areas. By the clay-sand mixture separation technology by the large-scale cutter suction dredger,we solve the problem of separating the sand from the clay ball and the shell and ensure the quality of the bag-filling sand,improve the construction efficiency of the sand bag-filing efficiency and greatly reduce the construction cost.