Steel pile

Keywords:steel pile

Steel pile is composed of a steel pipe, a tongue-and-groove groove, and a tongue-and-groove pin. The left end pipe wall of the steel pipe diameter is vertically connected to the tongue-and-groove groove, and the cross-section of the groove is a square shape with one side open, on the side of the groove with the reinforcing rib is provided, and the right end pipe wall of the diameter of the steel pipe is vertically connected with the tongue-and-groove pin at the partial radius position, and the groove section of the tongue-and-pin pin is an I-shaped pile foundation.

Characteristics of steel pile
(1) Light weight, good rigidity, convenient loading, unloading, transportation and stacking, not easy to damage;
(2) High bearing capacity. Due to the high strength of the steel, it can be effectively penetrated into the hard soil layer, the pile body is not easily damaged, and the bearing capacity of the single pile can be obtained greatly;
(3) The pile length is easy to adjust. The length of the pile can be adjusted by lengthening or cutting as needed;
(4) The amount of soil discharged is small, and the impact on adjacent buildings is small. The lower end of the pile is open. As the pile is driven in, the soil is squeezed into the pile tube and the amount of soil is reduced compared with the actual pile. The disturbance to the surrounding foundation is also small, and the uplift of the soil can be avoided. The vertical displacement of the first pile is avoided. The horizontal displacement of the pile top can also be greatly reduced;
(5) The connector is simple to connect. It is easy to operate, high in strength and safe to use by electric welding.
(6) The project quality is reliable and the construction speed is fast. However, the steel pile also has a large amount of steel, and the construction cost is high; the pile driving equipment is more complicated, the vibration and noise are large; the pile material is poorly protected and corroded, and there should be sufficient technical and economic analysis and comparison when selecting.

Construction of steel piles
The steel pipe is generally made of ordinary carbon steel with a tensile strength of 402 MPa and a yield strength of 235.2 MPa, or is selected according to design requirements. According to the processing technology, there are two kinds of spiral seam steel pipes and straight seam steel pipes. Due to the high rigidity of the spiral seam steel pipe, it is used more in engineering. In order to facilitate transportation and limited by the height of the pile frame, the steel piles are often composed of an upper section pile, a lower section pile and several middle section piles. The length of each section is generally 13m or 15m.


The lower end of the steel pile has an opening and a closed mouth. The diameter of steel piles is from φ406.4~φ2032.0mm, and the wall thickness varies from 6~25mm. The specifications and performance of common steel piles are shown in Table 7-92, which should be based on engineering geology, load, foundation plane, upper load and construction conditions. After comprehensive consideration, choose. Commonly used in China are φ406.4mm, φ609.6mm and φ914.4mm, and the wall thickness is 10, 11, 12.7, 13mm and so on. Generally, the upper, middle and lower section piles often use the same wall thickness. Sometimes, in order to make the pile top can bear huge hammering stress and prevent radial instability, the wall thickness of the upper section pile can be appropriately increased, or a width of 200~300mm and thickness of 6~12mm can be welded on the outer ring of the pile tube. Flat steel reinforcement hoop. In order to reduce the frictional resistance of the pile tube sinking and prevent the end portion from being damaged due to deformation when entering the hard soil layer, a reinforcing hoop is also arranged at the lower end of the steel pile, and the height is 200-300 mm for the φ406.4~φ914.4mm steel pipe. The thickness is 6~12mm.

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