Pile foundation construction method

Abstract

The present invention discloses a construction method of building pile foundation engineering, in particular, it relates to a pile foundation construction method of pipe-sinking belled pile. Said construction method includes the following steps: pressing the sinking pipe with metal pile head to the hard soil layer with designed level; taking out metal pile head, using belling equipment to enlarge base and make the base portion be formed into a base hollow cavity; borrowing; pouring prepared concrete into the base hollow cavity to form a cast-in-situ concrete base; injecting cement slurry along the internal wall of said sinking pipe, then drawing out said sinking pipe so as to obtain the invented building pile.

Description

technical field [0001] The invention relates to a construction method of a building pile foundation project, in particular to a pile foundation construction method of an immersed tube bottom expansion pile. Background technique [0002] The quality of building foundation works will directly affect the quality of buildings, so the construction units not only pay attention to the construction quality of above-ground buildings, but also pay more attention to the quality of foundation works. And invest in scientific research to tap the potential of pile foundation engineering, so that it can improve the utilization rate of material strength on the premise of ensuring the quality of the project. In order to improve the bearing capacity of single piles, expanded bottom piles and composite foundation piles have appeared one after another. Although this has significantly improved the bearing capacity of single piles compared with traditional foundation piles, because the traditional...

AI Technical Summary

Problems solved by technology

In order to improve the bearing capacity of single piles, expanded bottom piles and composite foundation piles have appeared one after another. Although this has significantly improved the bearing capacity of single piles compared with traditional foundation piles, because the traditional pile foundation engineering construction method is manually Excavate the soil, take the soil and dig the pile body soil, and then dig down a certain depth to prevent the collapse of the immersed pipe. On the hard soil layer, after forming, hoist out the bottom expansion equipment to take soil, and then directly pour concrete into piles

Thereby it can be seen that the traditional pile foundation pile foundation construction method also has the following defects: the pile body part soil is manually dug out, the construction surface is too large, the workload of taking soil is obviously increased, the work efficiency is low, and the cost is high; Without the support of immersed tubes, the positioning is not accurate, the expansion angle of the base is too small, and the parameters in the bottom expansion process cannot be guaranteed, so that the quality of the pile is not easy to control, and it is difficult to meet the design requirements, resulting in a greatly reduced bearing capacity of the single pile; There are potential safety hazards for construction personnel, and accidents are prone to occur if construction personnel do not pay attention; the scope of use is narrow, not only not suitable for bottom expansion of small-diameter piles, but also not suitable for bottom expansion and formation of prefabricated piles and high-complex geological conditions. pile