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

A technology of bottom-expanding piles and immersed pipes, which is applied in sheet pile walls, buildings, and foundation structure engineering. The effect of improving construction safety and improving strength utilization

Inactive Publication Date: 2008-04-16
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 pile-forming method for pipe sinking prefabricated steel concrete pedestal pile
  • Bottom expanding and pile-forming method for pipe sinking prefabricated steel concrete pedestal pile
  • Bottom expanding and pile-forming method for pipe sinking prefabricated steel concrete pedestal pile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1: a. sink the immersed tube with the metal pile head through the soft soil layer to the hard soil layer at the design level; Align the feet with the marks on the mouth of the immersed tube and lower them into the immersed tube. The positioning iron feet smoothly enter the positioning groove at the lower part of the immersed tube. After the upper end of the equipment is firmly positioned, the machine power lever is activated to expand the bottom of the equipment. The expansion of the bottom is to expand the bottom vertically first. Then expand the bottom horizontally, that is, when it rotates clockwise, it advances downward, and the vertical cutter works. When it reaches the design standard depth, it stops automatically. Turn clockwise, the central axis starts to lift, the upper end of the equipment is firmly positioned, and then the equipment is started to expand the bottom. The bottom expansion is first vertical expansion and then horizontal expansion. When...

Embodiment 2

[0030] Embodiment two: step a is the same as step a described in embodiment one, b, take out the metal pile head, throw the discrete matter downwards from the immersed tube mouth, the discrete matter is quicklime or talc powder to facilitate soil absorption, expand the bottom with bottom expansion equipment For bottom excavation, when the diameter of the base is large, in order to prevent the accumulation of crushed soil and increase the resistance of the cutter, use the air suction device to absorb the soil once and then continue to expand the bottom until the base cavity shape required by the design is reached; c. Use the air soil suction equipment to take the soil for the second time until the soil is taken out; d. Use a camera with a light source to take pictures in the cavity of the base to see if the quality meets the design requirements, record the imaging and file, and correct any problems found in time; e. The radial steel bars are put into the expanded base and nailed...

Embodiment 3

[0031]Embodiment 3: The method of expanding the bottom and forming piles of immersed tube prefabricated steel concrete expanded bottom piles is as follows: a, the immersed tube with the metal pile head is passed through the soft soil and laminated to the hard soil layer at the design level; b, the metal pile is taken out Align the positioning iron feet of the bottom expansion equipment with the marks on the mouth of the immersed tube and lower the immersed tube. After the upper end of the equipment is firmly positioned, start the equipment to expand the bottom. The bottom expansion is to expand the bottom vertically and then horizontally. When the construction reaches After the design standard depth, it automatically stops, and the base cavity is formed at the bottom. At this time, when the bottom expansion cutter works to reach the designed base diameter, that is, the power rod reaches the predetermined number of revolutions, the bottom expansion is completed, and the bottom ex...

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Abstract

The invention discloses a building pile foundation project and a construction method thereof, in particular a method for enlarging pedestal and forming pile of an immersed tube precast reinforced concrete pedestal pile; the method comprises the following steps that: the immersed tube is passed through a soft earth layer and pressed to a designed level hard earth layer; a metal pile head is taken out, and put into the immersed tube to enlarge the pedestal; the earth is extracted by a device which uses air to absorb earth, when a small amount of earth is left in a base, water is poured from the mouth of the immersed tube, the water is absorbed while the poured until the earth is completed absorbed; radial reinforcing steel bars are arranged in the cavity of the base, and the hard earth is hammered into the cavity of the base, the concrete precast on the ground is filled in a long barrel and the barrel is put to the bottom of the immersed tube from the mouth of the immersed tube, when iron bars arranged on the bottom of the barrel touch the hard earth, the bottom gate of the barrel is forced open, then the concrete falls into the cavity of the base to form a cast-in-situ base, the precast reinforced concrete pile body is sunk and in even joint with the cast-in-situ base through the dowel bars of the reinforced concrete pile body to be jointed and anchored into a whole; the immersed tube is extracted out and the pile is formed. The invention extracts earth completely without granular loose earth, has high efficiency, improves the bearing capacity of single pile effectively and meets the design requirements, thereby ensuring the quality of the pile foundation work project and reducing construction cost.

Description

[0001] This application is a divisional application of application number 200610047085.4, application date 2006.06.30, invention name of bottom expansion and pile forming method of immersed tube prefabricated steel concrete expansion bottom pile. technical field [0002] The invention relates to a construction pile foundation project and a construction method, in particular to a bottom expansion and pile formation method of prefabricated steel concrete expanded bottom piles with immersed tubes. 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 utilization rate of material strength on the premise of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/50E02D5/44
Inventor 王国奋
Owner 王国奋
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