The material strength of the pipe pile is affected by the axial compressive strength of the concrete

Pipe pile features:
1, Specifications Φ300mm-Φ600mm.
2. High strength and fast production speed: Pressurization and steam curing can be used to form the next line in one day, and the strength of C80 concrete is 2-4 times higher than that of ordinary prefabricated piles.
3, stable quality: factory production, quality control can be relatively complete.
4. Construction is simple: The finished product can be directly piled and transported to the construction site. The construction speed is fast.
5. Low cost: In the reasonable use of pipe piles, the economic contrast with other mainstream piles has obvious advantages.
 Disadvantages: I summed up the following points:
1. The bearing capacity is restricted by the cross-sectional area of the ring pile concrete. It cannot be too large. This must be taken care of. Do not use it as a large-diameter cast-in-place pile. Some large-loaded buildings require a single pile. If the bearing capacity is high, or some owners try to find the maximum bearing capacity of a single pile through the static load failure test before construction, it is necessary to pay attention to its reliable material use strength. Such as PHC500 (120) A type pile single pile pile vertical strength design value Rp = 3250kN, if you test pile (of course, in accordance with the requirements of the standard test pile) to test the single pile bearing capacity characteristic value is 4000kN, you want It is simply not possible to persuade the Design Institute to use 4000 instead of 3250 kN. The reason is very simple. The material strength of several samples used for the test pile alone does not mean that the reliability of the material strength during large-scale construction can meet the standards for the test piles. To put it bluntly, perhaps the few piles that you try to use are “just right. "It's very strong!" ! We have a confidence interval when designing material strength design values. Only when the intensity of most (generally 95%) materials is within this range, the concept of material strength makes