Soft-and-hard interlayer alternation foundation drainage prestressed pipe pile and construction method

Abstract

The invention relates to a soft-and-hard interlayer alternation foundation drainage prestressed pipe pile. The soft-and-hard interlayer alternation foundation drainage prestressed pipe pile is characterized in that an expanded prestressed pile tip is arranged at the bottom of the prestressed pipe pile; the prestressed pile tip and the prestressed pipe pile are sleeved with a geotechnical cloth bag, and the top of a hard soil layer and a soft soil layer are locally expanded to form expanded cloth squeezing bags; a drainage pipe is arranged between the prestressed pipe pile and the geotechnical cloth bag, and the upper end of the drainage pipe extends out of the top of a cover plate to be communicated with a horizontal drainage main pipe on the upper portion of the cover plate; a pervious concrete pile periphery is arranged between the geotechnical cloth bag and the prestressed pipe pile; three to four arc-shaped steel plates connected in series are arranged at the position of the vertical center elevation of a carrying plate or a drainage plate along the lateral wall of the prestressed pipe pile; a steel strand penetrates through the steel strand fixing end of the expanded prestressed pile tip, and the other end of the steel strand is fixed on an anchor tool at the top of the cover plate; a cover plate is arranged at the top of a pile body. By means of the soft-and-hard interlayer alternation foundation drainage prestressed pipe pile of the structure, relative hard soil layers in a foundation can be sufficiently driven for carrying; meanwhile, drainage consolidation of the soft soil layers is conveniently achieved, foundation settlement is prompted to be completed in the construction period as far as possible, total settlement and after-construction settlement are small, and the good technical and economic benefits are achieved. The invention further discloses a construction method for the pile body.

Description

technical field [0001] The invention relates to a prestressed pipe pile for drainage of soft and hard interlayer interactive foundations and a construction method thereof, which belongs to the field of foundation treatment engineering and is suitable for foundation treatment projects such as highways, municipal roads, airports and dams under the interactive geological conditions of soft and hard interlayers. Background technique [0002] There are many types of soft soil foundations in my country, which are widely distributed, and the geological conditions of the interaction of soft and hard soil layers are also very common, and have the characteristics of high water content, high compressibility, low strength, and poor water permeability. There are often problems such as excessive total settlement, obvious differential settlement, excessive settlement in the later period, and insufficient bearing capacity, which affect the normal use performance and safety performance of the ...

AI Technical Summary

Problems solved by technology

This construction method will not fully expand the support plate due to insufficient pressure and other reasons, which will affect the load-bearing performance of the pile body and make it difficult to control the construction quality; at the same time, the pile body does not have a drainage channel reserved, which is not conducive to the drainage and consolidation of the surrounding soil

[0006] To sum up, although the existing pile types and construction methods can achieve a relatively ideal foundation treatment effect under suitable engineering environmental conditions, there are still things that can be improved.

Images