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Principles to Observe During Caisson Sinking

2015-12-10 783 0人评论

　　1）井内除土作业应对称、均匀地进行，保证沉井均匀下沉和沉井安全。
　　2）在不稳定土层中下沉时，除土位置应距刃脚有一定的安全距离，并随时注意沉井的状态，小心进行除土作业，防止井内的涌沙及沉井的失控。
　　3）沉井下沉过程中必须要做好对沉井状态的观测工作，掌握相应的地层、水流情况，随时采取各种措施对沉井进行调整、纠正和控制，确保沉井处于安全、可控状态。
　　4）井内出土尽量运离沉井，运至远处，防止弃土堆在沉井一侧造成偏压，使沉井产生偏斜。
　　5）沉井接高前不得将刃脚掏空，必要时还应在刃脚下回填或加支垫，防止沉井在接高过程中突然下沉。
　　6）当沉井下沉离设计标高还差2m左右高度时，应控制井内除土量，并注意调整沉井，避免沉井发生大量下沉或大的偏斜而无法达到设计要求的位置。

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