采用“液套”打桩法能够提高打桩工程的生产率,改善柴油打桩锤的工作状态,缩短噪声的延续时间并提高桩的垂直与水平荷载的承载能力。该方法的实质在于,在打桩的同时,向桩与土之间形成的间隙内注入液体(水或能硬化的混合物)。当注入水时,该方法叫做“触变液套”打桩法;当注入掺加硬化剂的尿素树脂或其他胶结材料时,则叫做“聚合物液套”打桩法。 为了查明打桩时桩外围土的裂缝发展过 The use of “liquid jacket” piling method can improve the productivity of piling works, improve the working status of diesel piling hammers, shorten the duration of noise and increase the vertical and horizontal load carrying capacity of piles. The essence of this method is to inject the liquid (water or hardenable mixture) into the gap formed between the pile and the soil while driving the pile. When the water is injected, the method is called “thixotropy liquid jacket” piling method; when injecting urea resin or other cementing material with hardener, it is called “polymer liquid jacket” piling method. In order to find out the cracks in the soil around the pile during piling