【Daily Discussion】Utilities - Civil Engineering - 20210330

: (1) The correct piling sequence is determined by factors such as the density of piles, the specifications and lengths of the piles, and whether it is convenient to move the piling rig. (2) 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 them to become floating piles ； 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 excessively large cut-offs at the top of the piles.

Answer: (1) The correct piling sequence is determined by factors such as the density of piles, the specifications and lengths of the piles, and whether it is convenient to move the piling rig. (2) 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 them to become floating piles ； 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 excessively large cut-offs at the top of the piles.

1. The correct piling sequence is determined by factors such as the density of piles, their specifications and lengths, as well as the ease of moving the piling rig. 2. Due to the compaction effect of the piles on the soil, the piles driven first are pushed horizontally by those driven later, resulting in deviation and displacement, or they are pulled vertically causing them to become floating piles ； 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 excessively large cut-offs at the top of the piles.

1) The correct piling sequence is determined by factors such as the density of piles, the specifications and lengths of the piles, and whether it is convenient to move the piling rig. 2) Due to the compaction effect of piles on the soil, the piles driven first are pushed horizontally by those driven later, resulting in deviation and displacement, or they are pulled vertically causing them to become floating piles ； 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 excessively large cut-offs at the top of the piles.

The piling sequence is determined based on factors such as the density of the piles, their specifications and lengths, as well as the ease of moving the piling frame. Impact of improper sequencing on project quality: Due to the compaction effect of piles on the soil, 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 excessively large cut-offs at the top of the piles.

1) The correct piling sequence is determined by factors such as the density of piles, the specifications and lengths of the piles, and whether it is convenient to move the piling rig. 2) Due to the compaction effect of piles on the soil, the piles driven first are pushed horizontally by those driven later, resulting in deviation and displacement, or they are pulled vertically causing them to become floating piles ； 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 excessively large cut-offs at the top of the piles.

The appropriateness of the piling sequence affects the piling speed, quality, and the surrounding environment. When the center distance between piles is less than 4 times the pile diameter, the piling sequence becomes particularly important. It influences the direction in which soil is displaced; the direction in which piling progresses determines the direction in which soil is pushed aside. Depending on the density of the pile group, the following piling sequence can be adopted: proceeding in a single direction from one side； Proceed symmetrically in two directions from the center ； Proceed from the center outward. For the first piling sequence, it is advisable to change the direction in which piles are driven row by row, in order to prevent the soil from being compressed in one direction and thus causing uneven compression. For piles in the same row, it may also be necessary to drive them at intervals. For large-scale pile groups, the latter two piling sequences should be used to avoid severe soil compression, which could make it difficult to drive the piles in, or cause the piles driven earlier to tilt due to compression. Large-scale pile groups should be divided into several areas, with multiple piling machines driving piles simultaneously following a logical sequence

The piling sequence is determined by factors such as the density of the piles, their specifications and lengths, as well as the ease of moving the piling rig； Due to the compaction effect of the piles on the soil, the piles driven first are pushed horizontally by those driven later, resulting in deviation and displacement, or they are pulled vertically causing them to become floating piles. As a result, it becomes difficult for the later-driven piles to reach the designed elevation or depth of penetration, leading to soil uplift and compression as well as overly large pile cuts.

1. The correct piling sequence is determined by factors such as the density of piles, their specifications and lengths, as well as the ease of moving the piling rig. 2. Due to the compaction effect of piles on the soil, the piles driven first are pushed horizontally by those driven later, resulting in deviation and displacement, or they are pulled vertically causing them to become floating piles ； Piles driven later have difficulty reaching the designed elevation or penetration depth, resulting in soil uplift and compression as well as excessively large cut lengths.

The piling sequence is determined based on factors such as the density of the piles, their specifications and lengths, as well as the ease of moving the piling frame. Impact of improper sequencing on project quality: Due to the compaction effect of piles on the soil, 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 excessively large cut-offs at the top of the piles.