我单位承担两项上水管道的施工任务;一项穿过马路路基,一项穿过铁路路基,分别采取了两种施工方法。现将具体作法介绍如下。一、穿越马路路基使用混凝土套管,采取两台100吨千斤顶推顶施工方法。1.工程量:长14米,即混凝土套管14节。2.套管规格:外径1200毫米, My unit has undertaken two construction tasks for the Sheung Shui Pipeline; one has crossed the railway roadbed and one has passed through the railway roadbed and adopted two construction methods respectively. The specific practices are described below. First, use the concrete casing through the roadbed of the road and adopt two 100-ton jacks to push the top construction method. 1. Engineering quantity: 14 meters long, ie 14 concrete casings. 2 casing specifications: outside diameter 1200 mm