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1 概述 大连市煤气事业起始于1902年,管道煤气年代久远,目前地下管网1600余km,其中建国初日伪留下的地下管网有800余km。 日伪留下的地下管网有以下特点:1.1 全部为铸铁管 管材强度低,承插接口脆弱,在地基的不均匀沉降和轻微的地震,尤其在路面改造过程中很容易发生断裂事故,而这些断裂在初期不易发现,极易酿成恶性事故。1.2 管道腐蚀严重
1 Overview The gas business in Dalian began in 1902. The pipeline gas has a long history. At present, there are more than 1,600 km of underground pipeline networks, of which underground pipeline networks left by Japan and Japan have more than 800 km. The underground pipe network left by Japanese and Puppet has the following characteristics: 1.1 All cast iron pipe materials have low strength, fragile socket interface, uneven settlement on the foundation and slight earthquakes, especially in the process of pavement reconstruction. These fractures are not easy to find in the early stages and are extremely prone to malignant accidents. 1.2 Serious pipe corrosion