共查询到19条相似文献,搜索用时 46 毫秒
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在公路路网工程建设中,大部分是在原有的旧路基础上加以改善、改造,使之技术标准符合公路技术规范要求,达到改善行车条件,提高行车速度为目的的,这样做就能利用旧路的一部分路基、路面、桥梁、涵洞,为业主节约投资,而且占用耕地面积比新建公路大为减少,为国家节约土地、节约资金,在这几 相似文献
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土工格栅是近几年新兴的一种公路施工材料,广泛应用于公路建设行业,特别适用于旧路加宽的路基处理。文章针对老路改建中新建路基出现不均匀沉降问题而引起的纵、横向裂缝等问题及新、老路基结合部位的处理进行分析研究,并通过老路改建的应用实例,提出了采用土工格栅处理新、老路基结合部的方法。 相似文献
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rwk parsons 《The South African journal of economics. Suid-afrikaanse tydskrif vir ekonomie》2007,75(4):599-615
This Presidential address briefly outlines the developments in Zimbabwe since independence in 1980 leading up to the current political and economic crisis. The Zimbabwean situation is assessed within the conceptual framework of patrimonialism and predatory states. The origins of the Zimbabwean crisis are then analysed in their economic and political context leading to an eventual “fragile” or “failed” state. Evaluation of the crisis suggests that institutional damage has proceeded to the point at which only large scale economic and political reconstruction offers sustainable long term solutions, irrespective of when President Mugabe leaves office. The address concludes with an examination of the regional implications for Southern African Development Community – as well as the role of the global community – and outlines some of the core components of any reconstruction process‐to‐be in Zimbabwe. 相似文献
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