Construction foundation piling method

Abstract

The present invention discloses a construction method of building pile foundation engineering, in particular, it relates to a building foundation pile-forming method of pipe-sinking belled pile. Said method includes the following steps: pressing the sinking pipe with metal pile head to the hard soil layer with designed level; taking out the metal pile head, utilizing belling equipment to enlarge base and make base portion be formed into base hollow cavity; borrowing soil; pouring the cement slurry into the base hollow cavity be means of sinking pipe, then pouring the broken stone into the base hollow cavity so as to obtain concrete base, then downwards placing the prefabricated reinforced concrete pile body and making said prefabricated reinforced concrete pile body and the cast-in-situ concrete base b butt-connected and anchored together to form one body by means of inserted ribs of its base portion; drawing out sinking pipe and injecting cement slurry so as to obtain the invented belled pile.

Description

technical field [0001] The invention relates to a construction method of building pile foundation engineering, in particular to a construction foundation pile forming method of sinking tube expanding bottom piles. 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 trad...

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 method of forming pile foundation piles also has the following defects: part of the soil body of the pile body 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; Immersed tubes are used as support, 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; Potential safety hazards for construction personnel, accidents are likely 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 cannot be used for bottom expansion and pile formation in prefabricated piles and highly complex geological conditions