Piling plays a load-bearing role in construction.
The load from the foundation and upper part of the house is transferred through the piles to the deep and excellent bearing layer to obtain strong end resistance; or through the piles that are long enough to cross the thick and not very good layer, Sufficient friction is obtained in the supporting layer. Using this resistance to carry the weight of the house is what it does. The depth of piling is determined based on the geological survey report and previous load test data. Hydraulic pile driving is a pile driving process that does not disturb the public. Its principle is to use a hydraulic jack to press the pile into the soil through the reaction force generated by the counterweight.
The pile depth is based on the total weight of the building, the foundation exploration report (soil conditions), and the pile diameter. Extended information
Notes
1. During the construction of concrete cast-in-place piles, before the steel cage is concealed, on-site supervisors should conduct acceptance of the concealed project and check the specifications and specifications of the steel bars in the cage. Whether the variety, size, stirrup spacing, length of the density zone, welding quality and electrode specifications meet the design and specification requirements are controlled as stopping points.
The construction unit should make a record of concealed acceptance of steel bars. The records should reflect the specifications, varieties, quantities, stirrup spacing, steel cage length and other main contents of the steel bars.
2. When issuing the underwater concrete opening appraisal, special attention should be paid to checking whether the strength grade of the underwater concrete is consistent with the design and whether the slump meets the construction requirements (generally 180-220mm), and based on The concrete strength and mix ratio required by the design control the amount of cement. At the same time, the supervisor should supervise the construction unit to make a set of test blocks for each pile. If the irrigation volume is greater than 50m3, a set of test blocks should be made for every 50m3.
3. The extubation speed of vibrating immersed cast-in-place piles is preferably 1 2-1 5 m/min for general soil layers, and should be controlled at 0 6-0 at the junction of soft soil layers and soft and hard soil layers. 8m/min; it is better to use the reverse insertion method for pouring concrete, which can effectively compact the space in the hole, has a vibrating effect, and can prevent necking; the concrete must be poured continuously, and the concrete in the pipe must be kept The surface is above the water table.
Baidu Encyclopedia - Piling
Baidu Encyclopedia - Engineering Piles