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Construction method for variable-section composite pile

A construction method and variable cross-section technology, applied in sheet pile walls, foundation structure engineering, construction, etc., can solve the problems of high cost, waste of resources, high pile replacement rate, etc., and achieve convenient construction, lower project cost, and simple operation Effect

Inactive Publication Date: 2020-07-03
SOUTHEAST UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the soft soil layer is the main compression layer. If the design is carried out according to the replacement rate of the soft soil layer, the replacement rate of piles in other soil layers will be higher, resulting in waste of resources;
[0006] (2) The pile spacing of traditional stiffened composite piles is small and the cost is high, which affects the popularization and application of stiffened composite piles

Method used

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  • Construction method for variable-section composite pile

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Effect test

Embodiment 1

[0028] Variable section composite pile of the present invention and construction method thereof, such as figure 1 shown. Include the following steps:

[0029] a. Leveling the site and positioning of the two-way mixing pile machine: the pile positions of the variable-section cement-soil mixing piles are arranged in a plum blossom shape or a square; use a crane to suspend the two-way mixer to the designated pile position and perform alignment;

[0030] b. Drilling down, grouting, mixing: Start the drill pipe and the pressurizing device in turn, the pressurized drill pipe drills down along the guide frame, and the mixing blade is extended to 800mm (the common diameter of the lower part of the variable cross-section mixing pile 800 ~ 1200mm, this embodiment selects 800mm pile diameter), when the bottom rotating blade of the drill bit at the end of the drill pipe finishes cutting and entering the soil, the spraying device is turned on, the middle rotating blade stirs, and the top ...

Embodiment 2

[0037] A variable section composite pile and its construction method, such as figure 1 shown. Include the following steps:

[0038] a. Leveling the site and positioning of the two-way mixing pile machine: the pile positions of the variable-section cement-soil mixing piles are arranged in a plum blossom shape or a square; use a crane to suspend the two-way mixer to the designated pile position and perform alignment;

[0039] b. Drilling down, grouting, mixing: Start the drill pipe and the pressurizing device in turn, the pressurized drill pipe drills down along the guide frame, and the mixing blade is extended to 800mm (the common diameter of the lower part of the variable cross-section mixing pile 800 ~ 1200mm, this embodiment selects 800mm pile diameter), when the bottom rotating blade of the drill bit at the end of the drill pipe finishes cutting and entering the soil, the spraying device is turned on, the middle rotating blade stirs, and the top rotating blade presses the ...

Embodiment 3

[0046] A variable section composite pile and its construction method, such as figure 1 shown. It is characterized in that it comprises the following steps:

[0047] a. Leveling the site and positioning of the two-way mixing pile machine: the pile positions of the variable-section cement-soil mixing piles are arranged in a plum blossom shape or a square; use a crane to suspend the two-way mixer to the designated pile position and perform alignment;

[0048] b. Drilling down, grouting, mixing: Start the drill pipe and the pressurizing device in turn, the pressurized drill pipe drills down along the guide frame, and the mixing blade is extended to 800mm (the common diameter of the lower part of the variable cross-section mixing pile 800 ~ 1200mm, this embodiment selects 800mm pile diameter), when the bottom rotating blade of the drill bit at the end of the drill pipe finishes cutting and entering the soil, the spraying device is turned on, the middle rotating blade stirs, and th...

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Abstract

The invention discloses a construction method for a variable-section composite pile, and is suitable for processing soft soil foundations. The construction operation of the construction method comprises the following steps of: a: flattening a place, and carrying out bidirectional stirring pile machine positioning; b: enabling the stirring pile machine to downwards drill to carry out guniting and stirring on a soil body; c: lifting the stirring pile machine, continuously stirring cement soil to the ground surface or to a position which is higher than an elevation for 50 cm or above, repeating band c to finish a lower part pile body of a variable-section stirring pile; d: elongating the vanes of a stirrer, and applying to a stirring pile expansion head part; e: finishing variable-section stirring pile construction; and f: when the constructed variable-section stirring pile is not hardened, applying a variable-section reinforced concrete precast pile with the expansion head by a vibratedpipeline sinking method on the center of the constructed variable-section stirring pile. The construction method disclosed by the invention fully combines the diameter expansion technologies of a single rigid pile and a stirring pile, so that the construction method has dual advantages of a variable section and a stiff composite pile, pile body bearing capacity can be effectively improved, a pileinterval is increased, engineering cost is lowered, and the construction method has a wide application prospect.

Description

technical field [0001] The invention relates to a variable-section composite pile and a construction method thereof, which is suitable for weak soil foundation treatment and foundation engineering, and belongs to the technical field of civil engineering. Background technique [0002] Deep and soft soil is widely distributed along the river and coastal areas of our country, which brings great challenges to engineering construction. At present, composite foundations and pile foundations such as cement-soil mixing piles, reinforced concrete prefabricated piles, and bored piles are mainly used for deep and soft soil treatment. The cement-soil mixing pile has the advantages of small construction disturbance, high speed, and low cost, but has the disadvantages of low strength of the pile body and difficult control of construction quality. Although the prefabricated pile has high strength and rigidity, when the ultimate bearing capacity is reached, the soil around the pile will be...

Claims

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Application Information

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IPC IPC(8): E02D5/48E02D5/50
CPCE02D5/48E02D5/50
Inventor 刘松玉张超哲赖丰文程月红
Owner SOUTHEAST UNIV
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