Exploding bottom-expanding pile-forming method for immersed tube prefabrication steel concrete bottom-expanding pile

Abstract

The invention discloses a construction pile project and a construction process, in particular to an explosive-enlargement and pile forming process of steel concrete belled pile of a immersed tube which is pre-formed , which comprises pressing an immersed tube to a hard stratum with designed height mark through passing through a soft stratum, taking out a metal pile head, sealing the mouth of the immersed tube after detonating blasting agent, opening objects which are used to seal the mouth of the immersed tube, taking soil with an air soil-absorbing device, detecting whether the quality reaches the designed requirement with a camera with light source in a cavity of a chassis, putting steel rids which take on irradiating form into a cavity of a chassis and nailing with firm soil, pouring quantitative cast-in-situ concrete to form a cast-in-situ chassis from the mouth of the immersed tube, putting pre-formed hollow pile body with initial stress which is integrated and anchored with the cast-in-situ chassis through dowel bars on the bottom portion, and drawing out the immersed tube pile. The process has simple and advanced technology process, can take soil without particle porous soil, has high efficiency, and increases the safety of construction when the pile works under the most economical state.

Description

[0001] This application is a divisional application with the application number: 200610047831.X, the application date: September 21, 2006, and the invention title: the blasting bottom expansion and pile forming method of immersed tube prefabricated steel concrete bottom expansion piles. technical field [0002] The invention relates to a construction pile foundation engineering and a construction method, in particular to a blasting bottom expansion and pile forming method of immersed tube prefabricated steel concrete bottom expansion piles. Background technique [0003] It is well known that the quality of building foundation works plays a vital role in the influence of building quality, 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. And invest in scientific research to tap the potential of the pile foundation project, so that it can improve the utilizati...

AI Technical Summary

Problems solved by technology

[0004]1. Part of the soil in the pile body was excavated manually, the construction surface was too large, the workload of soil extraction increased significantly, and the efficiency was low;

[0005]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 pile 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;

[0006]3. There are potential safety hazards for construction personnel, and accidents are likely to occur if construction personnel do not pay attention;

[0007] 4. The scope of use is narrow, not only not suitable for small-diameter pile bottom expansion, but also not suitable for bottom expansion and bottom expansion of prefabricated piles and highly complex geological conditions. Pile;

[0008]5. The granular loose soil sediment in the cavity of the expanded bottom is not clean, which has a serious adverse effect on the bearing capacity of the pile. Based on the above situation, in order to improve the unit Pile bearing capacity, to reduce foundation engineering costs, must be improved

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