Analysis of the construction process of steel pipe piles

In the construction sequence of steel pipe piles, we should first grasp all aspects of the project for comprehensive consideration and analysis, such as construction machinery, construction period, design requirements, geomorphic environment, engineering volume, layout, steel pipe pile specifications, and characteristics, geological conditions, and other aspects. The following is an introduction to the construction process of steel pipe piles.

First, steel pipe piles need to be properly stacked
The stacking site is required to be flat to ensure that large vehicles can enter directly. For low-lying areas of the site, ballast or road timber needs to be laid under the support point for artificial reinforcement, and drainage ditches need to be dug around the site. When stacking steel pipe piles, they need to be stacked according to the specifications of the steel pipe piles to facilitate supporting transportation. When stacking the support point, it is necessary to ensure that the steel pipe piles are not deformed. In addition, the steel pipe piles stacked on site should be placed within the lifting range of the pile driver. Since the steel pipe piles are lifted during lifting, the tops of all steel pipe piles need to face the pile foundation and be arranged in the order of piling.

Second, regarding the placement of steel pipe piles, move the pile driver to the pile position. If a few positions need to be adjusted, a rotating pile driver can be used to adjust them.
Before lifting the steel pipe piles, a comprehensive inspection of the appearance of the steel pipe piles should be carried out, and special attention should be paid to the ovality of the steel pipe piles and the squareness of the end faces of the H-shaped steel pipe piles. After the inspection, detailed records need to be made, and the steel pipe piles can be lifted only after they are qualified. When lifting the steel pipe piles, the top of the steel pipe piles needs to be put into the pile cap, and the pile bottom is aligned with the lime line and then inserted. The outer periphery of the H-shaped steel pipe pile is rectangular, and there are orientation requirements for the arrangement of the piles. It is necessary to ensure that both the longitudinal and transverse insertions are correct; for the right angles presented in front of and on the side of the pile driver, the verticality of the guide rod can be monitored by two theodolites to form a vertical line between the pile body, the pile cap, and the pile hammer.

Third, factors affecting the accuracy of steel pipe pile driving.
Affected by the weight of the steel pipe piles, the piles can slowly sink into the soil by their weight. This self-sinking situation should be controlled so that it is in a slow progress state, and the hammering work should be carried out after ensuring stability. In the initial stage, the use of hammering operations can easily lead to the state of the diesel hammer being difficult to burn and empty hitting, so during this period, the quality of pile sinking needs to be tracked and observed at any time. If abnormal conditions are found, measures should be taken in time to correct them. In serious cases, the steel pipe piles should be pulled out and reinserted, and forced measures should be taken to make the steel pipe piles sink along the predetermined trajectory.