在国家“六五”科技攻关项目的“疏港公路工程技术的研究”课题中,提出了“下穿式道路简单立交结构型式和防水措施”的研究专题(以下称“简交”)。经过两年多时间的设计、试验研究,于一九八五年二月在津塘疏港公路上建成了一座试验性的下穿“简交”工程,并在交通部科技攻关领导小组主持下,于一九八五年六月进行了现场初审,同年十一月正式通过了技术鉴定。“简交”工程较妥善地解决了地下水位高(距地表面约50～60cm),地基软弱(承载能力约58.84～78.45KPa)的结构物的防水、排水和软弱地基处理等关键性技术问题。因 In the “Sixth Five-Year Plan” scientific and technological project “Ports Highway Engineering Technology Research” project, proposed “underpass type of simple interchange structure and waterproof measures” research topic (hereinafter referred to as “Jane”). After more than two years of design and pilot study, a pilot project of “Simple Crossing” was completed on the Shuanggang Highway in Jintang in February 1985 and under the chairmanship of the Leading Group for Scientific and Technological Research of the Ministry of Communications , Conducted the first instance on the scene in June 1985 and formally passed the technical appraisal in November of the same year. The “Simple Crossing Project” properly solves the key technical problems such as waterproofing, drainage and weak foundation treatment of structures with high groundwater level (about 50-60cm from the ground surface) and weak foundation (carrying capacity of 58.84-78.45KPa) . because