Blast bottom expanding and pile-forming method for pipe sinking prefabricated steel concrete pedestal pile

Abstract

The invention discloses a building pile foundation engineering and construction method, in particular to blasting belled and pile-forming methods of sinking tube precast steel concrete structure belled pile. The invention comprises a first sinking tube is pressed into the earth, a second sinking tube is connected with the upper end of the first sinking tube by screw thread, and then the sinking tubes are pressed to hardpan designed with elevation; a metal pile head is taken out and the sinking tubes are sealed after detonating dynamite; an air soil-sucking device is used for taking soil; radial shape steel bars are put into a pedestal cavity and nailed into the hardpan. A concrete pedestal prepared on the ground is arranged into a long barrel, from a port of the sinking tube to the bottom of the sinking tube. When a pontil arranged at the bottom part of the long barrel touches the hardpan, a door at the bottom part of the long barrel is pushed open, the concrete inside drops into the pedestal cavity and forms a present pouring pedestal, which falls into the precast steel concrete belled pile and is solidified into a whole with a docking bolt of the present pouring concrete pedestal through a dowel bar at the bottom thereof; after pouring grout inside the sinking tube ports, the second sinking tube is pulled out and then the first sinking tube becomes the pile. The invention can take clean soil without granular soil, has high efficiency and effectively improves bearing capacity of the single pile.

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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