Bottom enlarging and bile-forming technology

Abstract

The invention discloses a building pile foundation engineering construction process, especially bottom expanding and pile forming process, comprising: pressing sinking pipe with metal pile head to the pan at the designed level; taking out the metal pile head and blasting away soil body with detonator; taking out soil; pouring the concrete ready made on ground into foundation cavity to make concrete foundation; placing in prefabricated reinforced concrete pile body and butt-jointing and anchoring the prefabricated steel concrete pile body with cast-in-site concrete foundation through joint bars at the bottom of the prefabricated reinforced concrete pile body; drawing out the sinking pipe to make it. As compared with the existing techniques, it has features of simple and advanced process, high efficiency, effectively improving single pile bearing capacity and reaching design requirements, assuring pile foundation engineering quality, reducing building cost, raising material intensity utilization ratio, making the pile work in the most economic state and improving construction safety.

Description

technical field [0001] The invention relates to a construction technology of building pile foundation engineering, in particular to bottom expansion and pile forming technology. Background technique [0002] The quality of building foundation works will directly affect the quality of buildings, so each construction unit not only pays attention to the construction quality of above-ground buildings, but also pays more attention to the quality of foundation works. 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, due to the fact that 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 l...

AI Technical Summary

Problems solved by technology

[0003] 1. Part of the soil body of the pile is dug out manually, the construction surface is too large, the workload of soil extraction is obviously increased, and the efficiency is low;

[0004] 2. Since there is no immersed tube as support for the bottom expansion equipment, 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 the single pile The bearing capacity is greatly reduced;

[0005] 3. There are potential safety hazards for construction personnel, and construction personnel are prone to accidents if they do not pay attention;

[0006] 4. The scope of use is narrow, and it cannot be used for bottom expansion and pile formation in prefabricated piles and highly complex geological conditions