加临时浮力塞自平衡浮力法下管技术研究

Research on the Self-balancing Sinking Pipe Technology by Temporary Buoyancy Plug

现有单塞自平衡浮力法下管,塞下充气量较小,并且随着下管深度的增加,塞下空气进一步压缩,提供的浮力逐渐减小,无法满足下管要求。为增加管内储气段长度,设置临时浮力塞。所加临时浮力塞与单塞自平衡下管时的浮力塞处于同一深度,在此处焊接带加强筋的封板作为临时浮力塞,利用常规空管提供浮力。当临时浮力塞上部空管高度达到设计值时,加设混凝土材质浮力塞并充气,随着充气压力的增大,设置在临时浮力塞下部的钢球脱落,空气进入临时浮力塞下部空间。与单塞自平衡浮力法相比,增加了临时浮力塞下这段充气量,因此提供的浮力也增大,从而实现一次性充气下完全布钢管。

Single plug buoyancy method was used to sink gas pipe, but space under the plug was small. With creasing depth of the gas hole, air under the plug had been compressed, then the buoyancy provided by air decreased too much to meet demand of sinking pipe. To increase the length of air column, temporary buoyancy plug was been made. This plug has been placed same depth of the single plug self - balancing method to sink pipe. A sealing plate was welded as temporary buoyancy plug, and this method also used upon empty pipe section to produce buoyancy. When the upon empty pipe＇s length reached designed length, concrete buoyancy plug was going to be installed. And air will be aerated into the empty pipe under the concrete plug, with the pressure increasing, the steel ball which was placed in the temporary buoyancy plug, exfoliated into mud. Air was aerated into space under the temporary buoyancy plug. Compared to single plug self - balancing buoyancy method, temporary buoyancy plug has increased length of air column, then the buoyancy produced by air was also increased. Implementation is that all steel pipe can be sinked only with one time aeration.