Composite pile structure suitable for coastal deep reclaimed soil foundation treatment and construction method

Abstract

The invention discloses a composite pile structure suitable for coastal deep reclaimed soil foundation treatment and a construction method. The structure comprises prestressed concrete thin-walled hollow square piles, nail type bidirectional agitating mixing piles and an upper portion mattress layer. The prestressed concrete thin-walled hollow square piles are long rigid piles and penetrate through a reclaimed soil layer to a supporting layer for controlling settlement, and meanwhile reinforced concrete bearing platforms are arranged at the tops of the prestressed concrete thin-walled hollow square piles and used for adjusting the pile soil load sharing ratio, so that the high bearing capacity performance of the prestressed concrete thin-walled hollow square piles is brought into full play. The nail type bidirectional agitating mixing piles are flexible piles, based on the composite foundation stress transfer and bearing optimizing principle, the upper portion reclaimed soft soil layer with large additional stress is reinforced with more attention, and the upper pile body replacement rate is increased. The prestressed concrete thin-walled hollow square piles and the nail type bidirectional agitating mixing piles are arranged alternately, the requirement for the bearing capacity and post-construction settlement can be met, and the project construction cost can be reduced.

Description

technical field [0001] The invention relates to a composite pile structure and a construction method suitable for foundation treatment of deep and thick dredging fill soil along the coast. Background technique [0002] my country has a coastline of 18,000km, and there are 12 provinces, municipalities, and autonomous regions along the coast, including Liaoning, Hebei, Tianjin, Shandong, Jiangsu, Shanghai, Zhejiang, Fujian, Taiwan, Guangdong, Guangxi, and Hainan. The tidal flats are well developed and have great potential for development. At the same time, with the rapid development of the economic construction of my country's coastal cities, the population of coastal areas is increasing, and the demand for land is also increasing, and the use of coastal intertidal zone silt flat land reclamation is to alleviate the shortage of land resources. effective way. According to preliminary statistics, since the founding of New China, my country has reclaimed about 12,000 hectares of ...

AI Technical Summary

Problems solved by technology

[0004] For dredger filled soil foundation, in order to meet the requirements of foundation bearing capacity and deformation control, surcharge preloading method, vacuum combined surcharge preloading method, dynamic compaction method, cement mixing pile, compacted gravel pile, prefabricated pipe Pile, low-strength pile composite foundation method, etc. These construction methods all play a certain role in dredging and filling soil foundation, but they all have their scope of application and have certain limitations.

The surcharge preload is limited by the construction period, the deep cement-soil mixed pile is limited by the depth of mixing treatment and post-construction settlement, and the prestressed reinforced concrete pipe pile is susceptible to the negative friction of the pile side induced by the foundation settlement in the later period, resulting in a decrease in bearing capacity , and is limited by its engineering cost, so the commonly used foundation treatment methods cannot meet the requirements of bearing capacity, deformation control and cost saving at the same time

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