资源 标记: Road Construction
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1986-01-01 Roads vary from trails to major hard-surface highways. Depending on the local climate and materials available for construction, roads may sometimes be open to traffic for only part of the year. A year-round road is often more expensive to build, and may not always be necessary. As a general rule,...
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1987-01-01 Moving soil for irrigation and road-building is important to good farming. Careful preparation of land for irrigation and good water usage saves water, labor, and soil, and improves crop yields. Improved roads make communication easier between farmers, their suppliers, and their markets. Although...
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1990-01-01 This book serves as a brief introduction to labour-based road construction. It is aimed at supervisory staff and presents the broad technical, organisational and managerial principles of labour-based road construction works. 43 double-sided pages, illustrated Prepared for the International Labour...
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1996-01-01 The text covers two basic designs of eath road called, for convenience 'village' and 'market' roads; definitions based on levels of usage, from a few vehicles per day or week (village), to perhaps 50 vehicles per day (market). The text describes the drainage principles and techniques; route...