PILE FOUNDATIONS FOR SUPPORTING POWER TRANSMISSION TOWERS

• US 20160340857A1
• Filed: 08/02/2016
• Published: 11/24/2016
• Est. Priority Date: 03/28/2014
• Status: Active Grant

• Current Assignee: Public Joint Stock Company "Transneft", Transneft Siberia, JSC, Transneft Supervision, LLC
• Original Assignee: LLC "Transneft Research and Development Institute For Oil and Oil Products Transportation", Oil Transporting Joint Stock Company Transneft, Transneft Siberia, JSC
• Inventors: Revel-Muroz, Pavel Aleksandrovich, Smirnov, Nikolai Vladimirovich, Kumallagov, Vitaly Aleksandrovich, Semin, Evgenii Evgenievich, Ivakin, Alexandr Vladimirovich, Bogatenkov, Yury Vasilevich
• Granted Patent: US 10,443,207 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: E02D 27/12 Pile foundations
• CPC Class Codes: E02D 27/35 Foundations formed in frozen ground, e.g. in permafrost soil
• CPC Class Codes: E02D 31/14 against frost heaves in soil
• CPC Class Codes: E02D 5/30 made of concrete or reinforced concrete or made of steel and concrete E02D5/50 takes precedence; assembled from segments E02D5/523; prestressed concrete E02D5/58
• CPC Class Codes: E02D 5/60 Piles with protecting cases

Abstract

Pile foundations for power transmission towers or the like are installed in different types of soil prone to frost heaving. The pile foundations provide bearing capacity against horizontal loads, reduce labor content and installation cost, and increase reliability against the impact of frost heaving forces of the soil on the pile. The pile foundation has a casing pipe and a dipped pile, comprising a shaft and a toe bulb, secured at the bottom of the shaft. The pile comprises rigid elements that are mounted on the shaft in the direction of horizontal forces acting on the pile against the anticipated horizontal loads. The rigid elements transfer horizontal forces from the pile to the casing pipe.

Claims

1. A pile foundation for supporting horizontal and vertical loads in substrates susceptible to frost heaving, the pile foundation comprising:

a casing pipe;

an immersed pile comprising a shaft and a toe bulb secured at the bottom of the shaft, positioned in the casing pipe;

rigid elements mounted on the shaft transverse to horizontal forces acting on the pile and configured for transferring the horizontal forces from the pile to the casing pipe.

2. The pile foundation of claim 1, wherein each of the rigid elements is disposed on the shaft with a spacing of not less than the length of the each of the rigid elements from its nearest vertical neighbor.

3. The pile foundation of claim 1, further comprising a cutoff screen mounted on the shaft from an upper part of the shaft to a level of seasonal freezing and thawing of soils.

4. The pile foundation of claim 2, wherein the cutoff screen comprises a plastic film or sheet.

5. The pile foundation of claim 2, wherein the cutoff screen comprises a galvanized metal sheet.

6. The pile foundation of claim 2, wherein the cutoff screen is installed close to the shaft and fixed to the shaft using clamps.

7. The pile foundation of claim 1, wherein each of the rigid elements comprises a generally flat plate having a shape selected from square, triangular, or circular.

8. The pile foundation of claim 1, wherein the pile shaft is made of one of concrete, steel, or reinforced concrete.

9. The pile foundation of claim 1, wherein the pile toe bulb has a shape selected from tapered, circular, or flat.

10. The pile foundation of claim 1, wherein the toe bulb is secured by welding to the shaft.

11. The pile foundation of claim 1, wherein the toe bulb is secured by being molded as a single monolithic structure with the shaft.

12. The pile foundation of claim 1, wherein pairs of the rigid elements are positioned on the opposite side of the shaft in a common plane.

13. The pile foundation of claim 1, wherein the casing is buried to a depth greater than a level of seasonal freezing and thawing of soils.

14. The pile foundation of claim 1, wherein a space between the casing and the shaft is filled with soil.

15. The pile foundation of claim 1, wherein a space between the casing and the shaft is filled with one of concrete or mortar.

16. The pile foundation of claim 1, wherein each of the rigid elements comprises a generally flat plate.

17. The pile foundation of claim 14, wherein each of the rigid elements comprises a steel material.

18. The pile foundation of claim 14, wherein each of the rigid elements is in the range of 1-50 cm long, 1-20 cm wide, and 0.1-5 cm thick.

19. The pile foundation of claim 14, wherein each of the rigid elements is welded to the shaft.

20. The pile foundation of claim 14, wherein the shaft comprises a steel material.