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What do you know about the use of tapered pile tip
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Conical pile tip refers to the pile tip of prestressed pipe pile, which is used for the foundation construction of prestressed concrete pipe pile and the front end of pipe pile. It is installed on the pipe pile head during the pile sinking construction to guide and block. Generally, during the construction of prefabricated piles, the pile tip is welded at the pile head to bring the pile body into the soil layer, avoid the damage of the pile head and the inclination of the pile body, and well enter the bearing layer.
Conical pile tip refers to the pile tip of prestressed pipe pile, which is used for the foundation construction of prestressed concrete pipe pile and the front end of pipe pile. It is installed on the pipe pile head during the pile sinking construction to guide and block. Generally, during the construction of prefabricated piles, the pile tip is welded at the pile head to bring the pile body into the soil layer, avoid the damage of the pile head and the inclination of the pile body, and well enter the bearing layer.
The shape of pile tip changes with the different geology and use, and various shapes and specifications are derived. Tapered pile tip shape, folded concrete molding. The pile tip is made of concrete by molding, which is conical and takes a long time to make. The pile tip formed by folding and steel plate cutting and welding has various shapes and fast manufacturing time. Folding and integral forming, the pile tip made of steel through melting into molten steel and molding in the mold has various shapes and rapid manufacturing time.
The function of conical pile tip, the main purpose of setting pile tip is to reduce the probability of pile breaking during pile driving, and increase the penetration ability of pile to soil layer, mainly shown in. To balance the stress at the buried end of the pile, the pipe pile can be regarded as a relatively uniform material. In the process of pile burying, under the combined action of hammer impact energy, pile dead weight and soil reaction, the buried pile end will bear very complex stress, with different sizes of each part. If the embedded end of the pile is restrained after the pile tip is added, the steel plate with sufficient thickness, such as the reinforced concrete structural beam plate force, can prevent the pipe pile from bearing the resultant force directly, but the pile head and the soil layer are connected together.
The deformation of the steel plate at the tip of the tapered pile offsets part of the kinetic energy. With its thickness and size, the standard steel plate at the pile end is elegant, but under such a huge impact energy, the steel plate as an elastic material will deform. As long as the reaction force is large enough, there is room for deformation of the steel plate, and the deformation will absorb the energy transmitted by the pile driving. When encountering hard rock stratum, the steel plate will deform and absorb some energy, so that the pipe pile will not be damaged immediately. However, the thickness of steel plate and the dimension of non-standard pile tip used by many construction units are far from the requirements of the code. In an engineering example, the pile tip may have been deformed to the point where there is no deformation space before entering the bearing stratum, which is similar to that without the pile tip. When the geological soil layer changes suddenly, the huge impact force can directly act on the pipe pile, so how can it not break? It is not allowed to compare with the standard pile tip to see the rebound of pile hammer and the footage of pipe pile, so as to recover the hammer in time.
If the conical pile tip is not sealed, the soil layer will enter the inner cavity of the pipe pile. With the footage, more and more soil will enter the pipe pile and will not enter to a certain extent. At this time, the soil in the pipe pile will exert an outward pull on the pipe pile, making the pipe wall concrete bear a huge tensile stress. This force is only 4% of the spiral stirrup of the pipe pile and the stirrup of the pile head.
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