论文部分内容阅读
在一般的情况下,公路小桥涵工程的投资约占整个线路工程造价的10～15%左右。如果没有综合考虑,合理布置,往往不是增加投资,就是排洪不好,造成水害,影响正常营运,对养护工作及农田排灌不利。山区公路小桥涵位置的确定,与平原区不尽相同。由于山区具有水系明显且多、山洪暴发历时短、流速快、纵向起伏大、横向坡度陡、一般地质较稳定等特点;因此要根据达些特点,结合地形、地质、水文条件,慎重地选择。使桥涵位置与孔径,既能保证水流畅通、安全宣洩;又使桥涵造价最小,达到经济合理,不留后患的目的。
Under normal circumstances, the investment of highway bridges and culverts accounts for about 10 to 15% of the total line construction cost. If not properly considered and properly arranged, it is not always an investment increase or a poor flood discharge, resulting in water damage and affecting normal operation, which is unfavorable to conservation work and farmland irrigation and drainage. Determination of the location of small bridges and culverts in mountainous areas is not the same as in plain areas. Due to the obvious and numerous water systems in mountainous areas, the flash floods lasted for a short time, the flow velocity was rapid, the longitudinal fluctuation was steep, the horizontal gradient was steep, and the general geology was relatively stable. Therefore, we should choose carefully according to the features, combined with topographic, geological and hydrological conditions. So that the location of bridges and culverts and aperture, both to ensure smooth flow of water, safety catharsis; but also to minimize the cost of bridges and culverts, to achieve economic and reasonable, without leaving the trouble of purpose.