Why are many buildings in the south not built on piles?
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Why are many buildings in the south not built on piles? But in the north, this step is always necessary
It depends on the type of building and the geological conditions. For high-rise buildings and structures, pilings are also necessary in the southern part as well. For multi-story buildings, we determine the foundation design based on the geological conditions of the site; generally, this involves raft foundations or strip foundations under columns. As for whether it is due to geological reasons or climate factors in the north, it’s not very clear; it’s likely that not all buildings have piles installed. If anyone knows, please let me know; I want to understand why as well.
I see that for the buildings attached to my house, they first dig foundations, then build with stones; once it’s at ground level, they start constructing with bricks on top. I heard that the area in the north is saline-alkali soil, so pilings are needed; that’s all I know.
It’s not clear what the advantages are of buildings in the north. What should be done after the piles have been driven in? Is it still necessary to dig a foundation? Or start laying the foundation on the pile?
The decision to use pilings or not is not determined by whether it is in the north or south; rather, it is based on geological conditions, hydrological and climatic factors, earthquake risks, building type, and load distribution. The southern buildings mentioned by the poster are likely small single- or multi-story structures built in mountainous areas or other locations with good geological conditions. Even in the north, many multi-story buildings do not require pilings.
Oh, I see. It’s not mountainous around my home; perhaps the geology is better there. It’s possible to lay a foundation after digging to a certain depth. Last edited by Lai Lai on 2009-3-28 at 12:21.]
The foundation to be used is primarily determined based on the magnitude and nature of the loads acting on it, as well as the conditions of the soil base; it is decided whether the requirements regarding bearing capacity, deformation, and stability are met, with no distinction between the north and south.
Summarize two points: 1. Geological conditions 2. Load-bearing capacity above ground level
:) Whether piloting is necessary depends on the bearing capacity of the soil layer and its properties; it cannot be generalized. For example, in Shanghai, many buildings require piloting, and this is because the piles need to be supported on soil layers with higher bearing capacity. This post was last edited by qwh358476 on 2009-3-12 21:36.]
We need to analyze each situation on its own. If the bearing capacity is sufficient, there’s no need for pilings. We once worked on a project along the coast of Zhuhai; the owner, seeking cheaper land, purchased land by the sea to build a factory. As it turned out, the ground there was full of silt, resulting in very low bearing capacity, and pilings were necessary even for building roads, which led to heavy losses
In my opinion, the soil in the south is mainly clayey and compact; for buildings with lower floors, it is generally sufficient to dig a shallow foundation. However, for high-rise buildings, pilings are definitely necessary.
It still depends on the soil quality and the load on the building; there is no difference between the south and the north
In the north, there is also the issue of preventing foundation swelling due to freezing; even in the northeast, buildings with light loads require deeper foundations to avoid such swelling, which is why rubble foundations are very common in the north