Anti-upwarp threaded pile structure and design and construction method thereof

A technology of construction method and design method, which is applied in the direction of foundation structure engineering, sheet pile walls, buildings, etc., can solve the problems of poor economy, limited pile side resistance, high economy, etc., so as to increase the anti-arching ability and enhance the uplift resistance Performance, the effect of improving the overall strength

Inactive Publication Date: 2020-09-22
CHINA RAILWAY ERYUAN ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to: under the soft rock deep cutting condition existing in the prior art, the geotechnical body will reduce the anti-arching ability of the uplift pile, while the pile side resistance provided by the conventional equal-diameter uplift pile is relatively limited, resulting in The designed pile body is longer, the cross-section is larger, and the economy is poor. A design method of an anti-arching threaded pile structure, a design method of an anti-arching threaded pile structure and a construction method of an anti-arching threaded pile structure are provided, which can increase the resistance The anti-camping ability of the uplift piles not only meets the conditions of soft rock and deep cutting, but also has smaller specifications and is more economical than conventional equal-diameter uplift piles under the same anti-cambering ability. high

Method used

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  • Anti-upwarp threaded pile structure and design and construction method thereof
  • Anti-upwarp threaded pile structure and design and construction method thereof
  • Anti-upwarp threaded pile structure and design and construction method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Such as figure 2 As shown, the anti-arching threaded pile structure described in this embodiment includes a threaded pile 2, the upper part of the threaded pile 2 has a section 21 of equal diameter, and the lower part of the threaded pile 2 has a threaded section 22. There are threads on the outer wall of the threaded section 22, and the outside of the equal-diameter section 21 is covered with a double-layer steel casing 1. The double-layer steel casing 1 includes an inner steel casing and an outer steel casing, and the inner steel casing It can move relative to the outer steel casing. During construction, the threaded section 22 extends into the stable zone 4 of the foundation, and the equal-diameter section 21 is located in the upper arch deformation zone 3 of the foundation. The threaded pile 2 outside the equal-diameter section 21 There is a double-layer steel casing 1, which can effectively eliminate the adverse side resistance effect of the threaded pile 2 struct...

Embodiment 2

[0057] Such as figure 2 As shown, a design method for the anti-arching threaded pile structure described in Embodiment 1 described in this embodiment includes the following steps,

[0058] 1. Calculate the area of ​​the threaded pile 2 according to the outer diameter of the threaded pile 2:

[0059] A p = πD 2 / 4

[0060] In the formula: A p is the area of ​​threaded pile 2, m2; D is the outer diameter of threaded pile 2, m.

[0061] 2. Calculate the circumference of the threaded pile 2 according to the outer diameter of the threaded pile 2:

[0062] u=πD

[0063] In the formula: u is the circumference of threaded pile 2, m.

[0064] 3. Calculate the effective self-weight of threaded pile 2:

[0065] G p =γA p l p

[0066] In the formula: G p is the self-weight of the threaded pile 2, kN; λ is the average weight of the soil between the threaded pile 2 and the thread, which can be approximated as the concrete weight, and the buoyant weight below the groundwater le...

Embodiment 3

[0080] Such as figure 2 As shown in the figure, the soft rock deep cutting structure of a ballastless track of a high-speed railway is provided with threaded pile structures to resist the upward arching force generated by the soft rock. Screw pile length l p The length of the threaded pile is 15m, the length l of the threaded pile is 5m, the outer diameter of the threaded pile is D=1.2m, the inner diameter is d=1.0m, and the concrete weight is 25kN / m 3 , without considering the effect of groundwater. The pullout coefficient λ of the threaded pile is 0.7, the enhancement coefficient β is 1.5, the stratum below the base is uniform, and the standard value of the ultimate side resistance of the dry-work bored pile in soft rock is q sik is 80kPa. The safety factor K is taken as 2.0, and the vertical uplift bearing capacity of threaded pile 2 single pile required on site must be greater than 1100KN.

[0081] (1) Calculate the area of ​​the threaded pile according to the outer d...

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Abstract

The invention relates to the field of geotechnical engineering, in particular to an anti-upwarp threaded pile structure and a design and construction method thereof. The threaded pile structure comprises a threaded pile, the upper portion of the threaded pile is provided with an equal-diameter section, the lower portion of the threaded pile is provided with a threaded section, the outer wall of the threaded section is provided with threads, the outer side of the equal-diameter section is sleeved with a double-layer steel pile casing, the double-layer steel pile casing comprises an inner-layersteel pile casing body and an outer-layer steel pile casing body, and the inner-layer steel pile casing body and the outer-layer steel pile casing body can move relatively. According to the anti-upwarp threaded pile structure, the upwarp resistance of the uplift pile (the threaded pile is selected as the uplift pile) can be improved, the anti-upwarp threaded pile structure can be used under the condition of soft rock deep cutting, and compared with a conventional equal-diameter uplift pile, the anti-upwarp threaded pile structure is smaller in specification and higher in economical efficiencyunder the condition of the same upwarp resistance.

Description

technical field [0001] The invention relates to the field of geotechnical engineering, in particular to an anti-arching screw pile structure and its design and construction method. Background technique [0002] Soft rock generally has strong properties of unloading creep and water swelling. When the ballastless track passes through the soft rock area in the form of deep cutting, under the dual influence of excavation unloading and water environment change, subgrade structure will appear. There is a greater risk of arching disease. [0003] In order to ensure the safety of high-speed railway operation, the uplift pile structure is usually used to control the deformation of the subgrade arch. [0004] However, if figure 1 As shown, under the soft rock deep cutting condition, there is an arching deformation zone 3 at a certain depth below the subgrade, and the lower part of the arching deformation zone 3 is a stable area 4, and the rock and soil in the arching deformation zon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/56E02D5/36G06F30/13G06F119/14
CPCE02D5/56E02D5/36G06F30/13G06F2119/14
Inventor 周和祥付铭川李宁周成吴沛沛胡超曾永红龚建辉肖昌睿陈伟志周川滨张耀
Owner CHINA RAILWAY ERYUAN ENG GRP CO LTD
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