Construction method for foundation pit support utilizing prefabricated large-diameter pipe pile

Abstract

Provided is a construction method for foundation pit support utilizing prefabricated large-diameter pipe pile, through this method the pipe pile can be sunk into a hole being drilled. The method applies to a large-diameter pipe pile being sunk. All of components, such as the prefabricated capping beam configured to fix all pile heads and the prefabricated waist beam configured to secure the pile bodies, can ensure the excellent fixture of the pipe piles during the construction of the foundation pit. This method has a good retaining and protecting effect when applied to construction of a deep foundation pit requiring large-diameter pipe pile. It can reduce the environmental impact caused by waste soil and mud discharge in traditional cast-in-place construction, and the use of prefabricated components decreased the construction period and improved the construction efficiency.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application claims priority of Application No. 201910734619.8 filed in China on Aug. 9, 2019, under U.S.C. § 119, the entire contents of which are hereby incorporated by reference.FIELD OF TECHNOLOGY[0002]The following relates to a field of foundation pit construction, in particular, a construction method for foundation pit support utilizing prefabricated large-diameter pipe pile.BACKGROUND[0003]The development and utilization of underground space generally requires the temporary support structure, so foundation pit engineering is very common in engineering construction. The foundation pit support construction not only play a role in retaining soil and water, but also requires cost under control, therefore, it is important to have such support structure with reasonable cost. The current support structure is mainly a cast-in-place structure, which generally has problems such as difficulty in ensuring construction quality, long construc...

AI Technical Summary

Benefits of technology

The present invention develops a method for supporting foundation pits using prefabricated large-diameter pipe piles. The use of prefabricated components ensures efficient and cost-effective construction. A retractable drill bit is used to drill a hole and a quick joint is used to connect prefabricated pipe piles for support. Grouting is also employed to increase the contact area between the pipe pile and soil. The technical effects include improved horizontal deformation resistance of the foundation pit and reduced environmental impact through waste soil and mud discharge.

Problems solved by technology

The current support structure is mainly a cast-in-place structure, which generally has problems such as difficulty in ensuring construction quality, long construction period, and severe environmental pollution.

However, because the larger the diameter of the prefabricated pipe pile, the greater the resistance of sinking pipe pile, thus the diameter of the prefabricated supporting pipe pile constructed by the static pressure method or the hammer method is usually within 600 mm, and the support structure constituted by such prefabricated supporting pipe pile cannot be applied to the foundation pit engineering with deep excavation, as its relatively low anti-bending / anti-sheering performance due to the prefabricated supporting pipe pile with such relatively small diameter.

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