Plastic sleeve and steel pipe combined cast-in-place concrete hollow pipe pile and construction method thereof

Abstract

The invention relates to a plastic sleeve and steel pipe combined cast-in-place concrete hollow pipe pile, which is characterized by mainly comprising an outer-side plastic sleeve, an inner-side steel pipe, a prefabricated waterproof pile tip, a concrete filled pile body and a cast-in-place pile top sealing end; and the prefabricated waterproof pile tip is arranged at the bottom of the hollow pipe pile, and the top surface of the prefabricated waterproof pile tip is provided with an outer-side immersed pipe connecting groove, a plastic sleeve connecting groove and an inner-side steel pipe connecting groove which are formed in the circular direction and are used for respectively limiting the positions of an outer-side immersed pipe, the plastic sleeve and the inner-side steel pipe. According to the invention, a pile body is isolated form an external environment by virtue of the outer-side plastic sleeve, the prefabricated waterproof pile tip and the cast-in-place pile top sealing end in three directions, the defect of corrosion of concrete and steel pipes is overcome, and meanwhile, the bearing capability of the pile body can be greatly promoted as the steel pipe is prefabricated in the pile body. The invention also discloses a construction method of the plastic sleeve and steel pipe combined cast-in-place concrete hollow pipe pile.

Description

technical field [0001] The invention belongs to the field of foundation engineering, and in particular relates to a cast-in-place concrete pipe pile combined with a plastic sleeve and steel pipe and a construction method, which can solve the corrosion problem of concrete and steel pipe at the same time, and can also greatly improve the bearing capacity of the pile body, and is suitable for hydrological applications. Foundation treatment projects in soft soil areas with poor geological conditions and high requirements for foundation bearing capacity. Background technique [0002] The composite foundation reinforcement method originated in the 1960s. It has become an ideal soft soil foundation treatment method because it can significantly improve the bearing capacity of the foundation, reduce foundation settlement, and effectively restrain the lateral deformation of the foundation soil. However, since the composite foundation is mostly buried underground, its pile materials wi...

AI Technical Summary

Problems solved by technology

However, since the steel pipes of concrete-filled steel pipe piles are directly exposed to the external environment, the corrosion problem has always been a difficult problem to be solved in the process of engineering construction.

[0005] In addition, in order to improve the durability of concrete, cements with good corrosion resistance are often used in engineering circles, such as slag cement, pozzolan cement, fly ash cement, etc. Although these types of cement have the advantage of improving the durability of concrete, their prices are relatively high. Ordinary Portland cement is much higher; concrete admixture is a substance added to improve and adjust the performance of concrete. Adding an appropriate amount of admixture has a certain effect on improving the performance of concrete, but its price is high and it is difficult to large area use

[0006] At present, there are new pile structures with plastic sleeves on the outside of the pile body, such as plastic sleeve concrete piles, which are composed of prefabricated water-proof pile tips, threaded plastic sleeves, concrete, pile caps (covers), etc. Relatively good engineering results have been achieved under the engineering background and geological conditions, but the pile body is a solid pile, and the diameter of the pile body is small, the bearing capacity is low, and the ability to resist lateral deformation is poor

[0007] To sum up, foundation water has a great influence on the durability of pile materials, the cost of anti-corrosion concrete is high, and the bearing capacity of concrete piles with plastic sleeves is low, and the ability to resist lateral deformation is poor

Images