Recently, we've received numerous phone calls from clients inquiring about the requirements for anti-floating design in buried pump integrated systems. Our editor has published an article to address this question.
During the anti-float design of buried integrated pump and tank systems, it is important to note that different stages have varying requirements.
(1) During the construction phase, it is crucial to consider scenarios where the main underground structure is completed, but the pit has not been backfilled or the backfill material has poor waterproofing. In such cases, the main structure may be flooded due to rainfall or other reasons, with the buoyancy resistance only being the weight of the underground structure, while the buoyancy is the water displaced by the entire structure. This situation is highly dangerous, as it can lead to the upward floating or tilting of underground structures. In practical engineering, this situation often occurs, particularly during the plum rain season or summer in the south when rainfall is concentrated. Similar situations include buildings with their bases in an aquifer, with a certain height of water head. During construction, if dewatering operations are required due to construction needs, and the weight of the completed underground structure is not yet able to completely counteract the buoyancy of groundwater, the dewatering measures are prematurely removed, leading to the upward floating or tilting of underground structures. The selection of the buoyancy resistance design water level during this phase is closely related to the construction conditions. The situations considered in the design calculations should be clearly stated in the specifications, and explicit requirements should be made for construction measures and limitations to avoid significant discrepancies between the designed buoyancy resistance water level and the actual groundwater level encountered during construction. For most above-ground structures that can counteract buoyancy with their weight after completion, particular attention should be paid to the buoyancy resistance design during the construction phase. As this situation is often overlooked or not considered by designers, it occurs relatively frequently in actual projects.
During the normal operation phase, this situation is generally well-considered during the design phase, with clear load considerations. The key factor in the design calculation is the selection and establishment of the anti-floatation design water level under the after-sales service rules.
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