Calculation method for allowable single pile bearing capacity of following drilling method railway tubular piles

A technology of allowable bearing capacity and calculation method, applied in the field of calculation of allowable bearing capacity of single piles of railway pipe piles with drilling method, can solve problems such as inconclusive results, reduce the drilling depth, improve the allowable bearing capacity of single piles, and significantly improve the bearing capacity of single piles. Economic and social benefits

Inactive Publication Date: 2016-09-07
CHINA RAILWAYS CORPORATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no conclusion on the calculation method of the allowable bearing capacity of the follow-drilling railway pipe pile.

Method used

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  • Calculation method for allowable single pile bearing capacity of following drilling method railway tubular piles
  • Calculation method for allowable single pile bearing capacity of following drilling method railway tubular piles
  • Calculation method for allowable single pile bearing capacity of following drilling method railway tubular piles

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Embodiment

[0049] Embodiment: In this embodiment, the calculation method for the permissible bearing capacity of a single pile of the heel-drilling railway pipe pile involves the pipe pile 1, and the pipe pile 1 is set by the following construction process:

[0050] (1) Install the drill bit with a special structure on the front end of the long screw, and then penetrate into the hollow part of the special pipe pile (pile bottom notch type) for the railway heel drilling method, drill the foundation directly below the pile end, and discharge the drilled soil upwards Side-by-side continuous pile sinking, before the drill bit penetrates into the bearing layer, the diameter of the drill bit is drilled down according to the size smaller than the pile diameter;

[0051] (2) When the design bearing layer is reached, the enlarged drill wing (1.2-1.5D) larger than the pile diameter (1.2-1.5D) will be hydraulically opened (confirm the state of its expansion head through the electronic display screen...

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Abstract

The invention relates to the field of railway bridges, in particular to a calculation method for the allowable single pile bearing capacity of following drilling method railway tubular piles. The calculation method is characterized by at least including the steps of calculating the allowable bearing capacity of each of soil around the tubular piles, soil around expansion head piles and soil on the bottoms of hole expansion piles, and combining the allowable bearing capacity for obtaining the allowable single pile bearing capacity of the following drilling method railway tubular piles. The calculation method has the advantage of realizing calculation of the allowable single pile bearing capacity of the following drilling method tubular piles. Compared with bored piles, the tubular piles have the advantages that the allowable single pile bearing capacity of the tubular piles can be effectively increased through the method, the pile length can be greatly reduced, the drilling depth can be reduced, the construction progress can be quickened, and the foundation construction period can be shortened. The economic benefit and the social benefit are remarkable.

Description

technical field [0001] The invention relates to the field of railway bridges, in particular to a method for calculating the allowable bearing capacity of a single pile of a heel-drilling railway pipe pile. Background technique [0002] The calculation of the allowable bearing capacity of the existing railway pile foundation is based on the "Code for the Design of Railway Bridge and Culvert Foundations and Foundations" (TB10002.2-2005). The calculation method for pile ② drilled (digged) hole grouting pile is given, as follows: [0003] 1. Friction pile [0004] ① Pile driving, vibration sinking and pile tip explosion expansion: [0005] [0006] In the formula: [P] --- the allowable bearing capacity of the pile (kN); [0007] U---the perimeter of the pile body section (m); [0008] l i --- Thickness of each soil layer (m); [0009] A - pile bottom bearing area (m); [0010] alpha i , a --- the influence coefficient of vibratory pile sinking on the frictional resist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D33/00
CPCE02D33/00
Inventor 桂婞陈良江刘建红潘湘文乔晋姿高策阮白一
Owner CHINA RAILWAYS CORPORATION
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