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Static pressure type rear support spiral pile based on bionics and construction method thereof

A technology of screw pile and static pressure, which is applied in foundation structure engineering, sheet pile wall, building and other directions, can solve the problems of large soil disturbance, insufficient horizontal bearing capacity of pile foundation, low construction efficiency, etc. The effect of small body disturbance and low construction noise

Active Publication Date: 2021-03-12
HOHAI UNIV +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Purpose of the invention: In order to solve the problems of low construction efficiency caused by low penetration rate of construction machinery, relatively large soil disturbance during construction, and relatively insufficient horizontal bearing capacity of pile foundations, this invention proposes a bionics-based Static pressure back-supported screw pile and its construction method

Method used

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  • Static pressure type rear support spiral pile based on bionics and construction method thereof
  • Static pressure type rear support spiral pile based on bionics and construction method thereof
  • Static pressure type rear support spiral pile based on bionics and construction method thereof

Examples

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Effect test

Embodiment 1

[0050] Embodiment 1 uses a static pressure back-stayed screw pile with a built-in steel pipe and its construction method.

[0051] When the built-in steel pipe 4 is used, the factory prefabricates the built-in steel pipe 4, the pile tip 6, the empennage 2, the outer casing 3, the outer support blade 9 and the flange 1. The built-in steel pipe 4 has a diameter of 76 mm, a length of 1.8 m, and a wall thickness of 8 mm. There are two rows of perforation holes on the upper part of the steel pipe, the first row is 80mm from the top, and the second row is located 50mm above the bottom of the empennage 2; the empennage 2 is composed of four trapezoidal wing plates, and the angle between the wing plates is 90° The plate width is 0.15m, the length of the flange is 0.3m, and the thickness of the flange is 5mm; the pile point 6 is an inverted conical closed pile point, the diameter of the conical bottom surface is 76mm, the angle of the pile point is 30°, and the outer edge of the bottom...

Embodiment 2

[0056] Finally, move the frame and construct the next static pressure back-supported screw pile until all the pile foundation construction in the site is completed. Embodiment 2: Static pressure back-supported screw pile using flexible anchor rod and its construction method.

[0057] When the flexible anchor rod 11 is used, the flexible anchor rod 11, the pile point 6, the empennage 2, the outer casing 3, the installation sleeve 12, the outer support blade 9 and the flange 2 are prefabricated according to the design requirements. The flexible anchor has a diameter of 10mm and a length of 2.1m. The top of the flexible anchor is equipped with a circular pull ring, the inner diameter is 30mm, the outer diameter is 50mm, and the diameter of the expansion head at the bottom is 50mm. The empennage 2 is composed of three trapezoidal wing plates, the angle between the wing plates is 120o, the width of the wing plates is 0.2m, the length of the wing plates is 0.3m, and the thickness of...

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Abstract

The invention discloses a static pressure type rear support screw pile based on bionics, which comprises a pile tip, an outer sleeve, a flange and an empennage, the empennage is arranged at the upperend of the outer sleeve, the flange is arranged at the top ends of the empennage and the outer sleeve, an outer support blade is arranged at the lower part of the outer sleeve, and when the outer support blade is pressed at the top of the outer sleeve, the outer supporting blades are unfolded outwards. A built-in steel pipe or a flexible anchor rod is arranged in the outer sleeve, and the pile tipis fixedly connected with the built-in steel pipe or the flexible anchor rod. By optimally designing the pile body, the side resistance is small during static pressure pile sinking penetration, the outer supporting blades are unfolded through secondary sinking of the outer sleeve, the vertical uplift and compression resistance bearing capacity of the outer supporting blades is improved, the horizontal bearing capacity of the outer supporting blades is improved through the arrangement of the empennage, and the uplift bearing capacity of the pile side and the blades is improved by utilizing thecharacteristics of compression shrinkage and tension expansion of negative poisson ratio materials. The method has the advantages of small soil disturbance, low construction noise and environmental friendliness.

Description

technical field [0001] The invention belongs to the technical field of pile foundations, and in particular relates to a bionics-based static pressure back-stayed screw pile and a construction method thereof. Background technique [0002] As a new type of foundation form, screw piles (or screw anchors) have been used in engineering practice as early as the mid-nineteenth century; in the early days, blades were added outside circular small-diameter steel pipes, and they were used in coastal areas that mainly resist uplift. Lighthouse foundation engineering was later gradually extended to applications including compression resistance and overturning resistance, especially the promotion and application of transmission and transformation line tower foundations, photovoltaic power station foundations, and transportation pipeline foundations. The screw pile has the technical and economic characteristics of convenient construction, simple process, low construction noise, environment...

Claims

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Application Information

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IPC IPC(8): E02D5/56E02D5/72E02D5/38E02D5/44E02D5/54
CPCE02D5/56E02D5/72E02D5/38E02D5/44E02D5/54E02D2300/0029E02D2600/30E02D2600/20E02D2250/003
Inventor 刘志鹏孔纲强杨庆李青松王志华陈兆坤高洪梅汪良坤郝冬雪闵凡路
Owner HOHAI UNIV
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