How deep are the piles for a typical viaduct, and roughly how many kilograms of rebar are used from the piles, to the columns, to the bearing platforms

Generally the piles have to be driven on hard rock layers a little below the surface. The geology of the country is different, so the length of the pile is different. For a typical 60 meter pile with a 1.2 meter pile diameter, the amount of rebar is around 4.3 tons.

Basic foundation requirements: strength -- foundation should have enough bearing capacity; deformation -- foundation settlement needs to be controlled within a certain range, followed by different parts of the foundation settlement difference can not be too large, otherwise the building The upper part of the building will produce cracking and deformation; Stability - the foundation should have the ability to prevent overturning, instability.

Static load test

The static load test technology of pile foundation is developed with the more and more extensive use of pile foundation in building design. After the founding of New China, the static load testing technology of pile foundation has been gradually developed. The traditional static load test is carried out by manual pressurization, manual operation and manual recording.

After the 1980s, with the footsteps of reform and opening up, the scale of capital construction increasing year by year, especially the wide application of grouted piles in the project, the static load testing technology of pile foundation in China has also entered into a brand-new development period. So far, pile static load test as a method established, theoretically indisputable pile testing technology.