【Daily Discussion】Utilities - Civil Engineering - 20210326

Error analysis: When considering the piling sequence, the compaction effect of the piles on the surrounding soil is the main factor to take into account； Impact on the structures and foundations of surrounding buildings ； Facilitate the entry and exit of pile drivers, as well as lifting and transportation vehicles. Piling sequence is generally divided into: proceeding in a single direction from one side (row by row), proceeding symmetrically from the center to both sides, proceeding from the center outwards, proceeding from the periphery towards the center, and proceeding from both sides towards the center. During pile driving, due to the compaction effect of the piles on the soil, the piles driven first are pushed horizontally by those driven later, resulting in offset and displacement, or they are pulled vertically causing the piles to become floating ； As a result, the piles driven later on fail to reach the designed elevation or depth of penetration into the soil, causing the soil to bulge and be compressed, and leading to overly large cut-offs at the top of the piles. Therefore, during the construction of pile groups, to ensure quality and schedule as well as prevent damage to surrounding buildings, the correct order of pile driving is determined before drilling, taking into account factors such as the density of the piles, their specifications and lengths, and the ease of moving the pile driving rig.