Bottom expanding and piling method by demolishing of pipe sank prefabricated steel concrete bottom expansion pile

A technology for expanding bottom piles and forming piles, which is applied in sheet pile walls, buildings, infrastructure projects, etc., can solve problems such as hidden safety hazards for construction workers, adverse effects on pile bearing capacity, and small expansion angle of bases, and achieves simple and advanced process methods. 、Ensure the quality of pile foundation engineering and improve the effect of strength utilization

Inactive Publication Date: 2010-06-16
王国奋
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Bottom expanding and piling method by demolishing of pipe sank prefabricated steel concrete bottom expansion pile
  • Bottom expanding and piling method by demolishing of pipe sank prefabricated steel concrete bottom expansion pile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment one: the method of blasting and expanding the bottom of the immersed tube prefabricated steel concrete expanded bottom pile, and forming a pile, a, the first section of the immersed tube with the metal pile head is pressed into the soil body, and the second section of the immersed tube and the first section of the immersed tube are pressed into the soil body. The upper end of the tube is threaded, and then the immersed tube is pressed to the hard soil layer at the design level; b. Take out the metal pile head, and put emulsified oil or ammonium antimony explosive from the immersed tube mouth, every 0.5m 3 The dosage is 1-5 kg. After detonating the explosive, seal the mouth of the immersed tube. After the explosion of the explosive is completed, open the article that seals the mouth of the immersed tube; c. Use the air suction soil equipment to take soil, when there is only a small amount of loose soil left in the base , in order to prevent the residual granula...

Embodiment 2

[0027] Embodiment 2: A method of blasting and expanding the bottom of an immersed tube prefabricated steel concrete expanded bottom pile, and forming a pile, a. The integral immersed tube with a metal pile head is passed through the soft soil and laminated to the hard soil layer at the design level; b. Take out the metal pile head, put emulsified oil or ammonium antimony explosive from the mouth of the immersed tube, every 0.5m 3 The dosage is 1-5 kg. After detonating the explosive, seal the mouth of the immersed tube. After the explosion of the explosive is completed, open the article that seals the mouth of the immersed tube; c. Use air suction soil equipment to carry out secondary soil extraction until the soil is cleaned ; d. Use a camera with a light source to check whether the quality meets the design requirements in the cavity of the base, and record and file the image, and correct any problems found in time; e. Put the radial steel bars into the cavity of the base and n...

Embodiment 3

[0028] Embodiment three: the blasting expansion bottom of immersed tube prefabricated steel concrete expanded bottom pile, method of forming a pile, a, the first joint immersed tube with metal pile head is pressed into the soil body, the second joint immersed tube and the first joint sinking tube are pressed into the soil body The upper end of the tube is threaded, and then the immersed tube is pressed to the hard soil layer at the design level; b. Take out the metal pile head, and put emulsified oil or ammonium antimony explosive from the immersed tube mouth, every 0.5m 3 The dosage is 1-5 kg. After detonating the explosive, seal the mouth of the immersed tube. After the explosion of the explosive is completed, open the article that seals the mouth of the immersed tube; c. Take soil with air suction equipment until the soil is clean; d. The radial steel bars are put into the cavity of the base and nailed into the hard soil. The quantitative concrete made on the ground is poure...

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Abstract

The invention discloses a construction pile foundation project and a method for constructing the same, in particular a method for explosively expanding bottom and forming pile through immersed tube prefabrication steel concrete. The method comprises the following steps that: an immersed tube is pressed into a firm ground layer with a designed height; a metal pile head is taken out, emulsified oilsor ammonium-antimony detonators are put into the immersed tube through the immersed tube orifice, and then the immersed tube orifice is sealed after the detonators are detonated; soil is taken out byusing an air absorption soil device; whether the quality reaches the designed specification is checked by a camera with the light source in the base cavity; radial reinforcing steel bars are put intothe base cavity and are hammered into the firm ground, stiff cement mortars which are prepared well on the ground are poured into the base cavity along the immersed tube orifice, and then carpolitesare poured into the base cavity and a concrete base without sands is formed, the prestressing prefabrication hollow pile body which is put into the concrete base and the cast-in-place concrete base are butt jointed and anchor fixed to form a whole through the inserted reinforcing steel bars at the bottom of the concrete base; the immersed tube is pulled out, and then cement mortars are poured intoalong the gap which is formed after the immersed tube is pulled out, and then a pile is formed. The invention has the advantages that soil is cleanly taken out without granular loose soil and the efficiency is high.

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D5/50E02D5/44E02D5/52E02D7/26
Inventor 王国奋
Owner 王国奋
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