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Advantages <br />1. Can be belled in till formation. Belled caissons will have high capacities. <br />2. Minimum noise and vibration. <br />3. Each column can be supported by a single caisson eliminating the need for caps. <br />Disadvantages <br />1. Cannot be belled in the outwash formation. <br />2. Steel casings may be necessary to support the hob during installation. <br />3. Subjected to a length versus diameter ratio of 30 (by Uniform Building Code). <br />+. Obstructions (concrete, cobbles, logs) would likely reduce installation speed end increase <br />concrete volumes. <br />S. No effective measure for reducing downdrag I.,eds. <br />Advantages <br />1. Relatively fut installation speed especially in areas of deep bearing stratum. <br />2. Can drive through most obstructions. <br />8.005.00695.016\6*060700.ip <br />00695.509.016 7 <br />