Common hydraulic crawler pile drivers on the market are primarily mechanically powered and are usually categorized into hammering, vibrating, and static pile pressing methods. When a crawler pile driver enters a construction site, the sequence of piling is determined based on site terrain conditions, foundation soil conditions, pile placement, as well as the length of the piles and the convenience of moving the pile frame. The goal is to achieve a uniform pile penetration depth and evenly compact the foundation soil.

If there are not many piles, the hydraulic crawler pile driver should start from the center and work towards opposite ends. However, for larger pile foundation areas, the base should be divided into several sections, and piling should be carried out separately within each section. The hydraulic pile driver should avoid starting from the outside towards the center or from the periphery towards the middle. This prevents the central foundation soil from becoming overly compacted, which increases the difficulty of driving piles and may cause already driven adjacent piles to rise. In silt and clay areas, it is especially important to avoid proceeding in one direction, which can cause the soil to be displaced to one side, leading to uneven pile penetration depths and uneven soil density, potentially causing uneven settlement of the entire pile foundation in the future. If the distance between piles is greater than or equal to four times the pile diameter or side length, the impact of the piling sequence is less significant. However, for area pile groups, it is necessary to plan the piling sequence in advance to prevent adverse outcomes or safety incidents.