Traditional Culture Encyclopedia - Traditional virtues - Relationship between pile foundation depth and building height
Relationship between pile foundation depth and building height
See "high rules" for the depth of burial.
The layout of pile 12.3. 12 shall meet the following requirements:
1 The center-to-center distance of piles with equal diameter should not be less than 3 times of the side length or diameter of pile section; The center distance of belled piles should not be less than 1.5 times the belled diameter, and the clear distance between two belled heads should not be less than1m.
2 When laying piles, it is advisable to make the resultant point of bearing capacity of each pile cap coincide with the corresponding resultant point of vertical permanent load, and make the pile foundation produce greater resistance moment in the direction where the torque generated by horizontal force is greater.
3. For the flat pile-raft foundation, the pile should be arranged under the column or wall, and it can be arranged all over the house if necessary, and the pile can be properly arranged under the core tube; Beam-slab pile-raft foundation, the pile should be arranged under the foundation beam or column; Pile box foundation should be arranged under the wall. Large-diameter piles with a diameter of not less than 800mm can use one column and one pile.
4. The bearing layer at the pile end should be hard soil. The depth of the full section of the pile tip with a pile diameter of d entering the bearing stratum should not be less than 2 days for cohesive soil and silt; Sandy soil should not be less than1.5d; ; Gravel soil should not be less than1d. When there is a weak substratum, the thickness of the hard bearing layer at the lower part of the pile tip should not be less than 4d.
In seismic design, the depth of piles entering gravelly soil, gravelly sand, coarse sand, medium sand, dense silt and hard cohesive soil should not be less than 0.5m, and other non-rock soil should not be less than1.5m..
12.3. 16 The plane size of box foundation shall be determined according to the bearing capacity of foundation soil, the arrangement of superstructure and load. The outer wall should be arranged along the periphery of the building, and the inner wall should be evenly arranged along the column network or shear wall position of the upper structure. The total horizontal cross-sectional area of the wall should not be less than110 of the horizontal projection area of the external wall package size of the box foundation.
For a box foundation with a plane aspect ratio greater than 4, the horizontal cross-sectional area of the longitudinal wall should not be less than118 of the horizontal projection area of the outer wall of the box foundation.
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