Frost damage proofed pile
First Claim
1. In a frost damage proofed pile installed in a frigid area where the pile is subjected to a frost heaving force, the improvement comprising a tubular sheath member fitted over the pile surface, said sheath member having a length longer than the thickness of an active or seasonally frozen soil layer of the terrain in which the pile is installed, at least a portion of said length defined by a series of ribs extending transversely outwardly of said sheath member relative to a lengthwise axial line as an extensible section, the lower end of said sheath member being secured to the pile at or below a position corresponding to the bottom region of said active or seasonally frozen soil layer, the upper end of the sheath member being secured to the pile at a position above the ground surface, and a fluid material being filled in a space defined between said pile and the sheath member.
1 Assignment
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Accused Products
Abstract
A frost damage proofed pile for installment in a frigid district where the pile is subjected to a freezing and frost heaving force, such as permanently or seasonally frozen soil terrain. A tubular sheath member is fitted over the pile surface and has a length longer than the thickness of an active or seasonally frozen soil layer of the terrain in which the pile is installed. At least a portion of said length of the pile is formed as an extensible section, and at least the lower end of said sheath member is secured to the pile at or below a position corresponding to the bottom region of said active or seasonally frozen soil layer. A fluid material is filled in a space defined between the pile and the sheath member. The frost heaving force caused to exist upon freezing of the active or seasonally frozen soil layer as well as negative friction caused to exist in summer are inhibited from affecting the pile due to sliding of the sheath member relative to the pile.
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Citations
36 Claims
- 1. In a frost damage proofed pile installed in a frigid area where the pile is subjected to a frost heaving force, the improvement comprising a tubular sheath member fitted over the pile surface, said sheath member having a length longer than the thickness of an active or seasonally frozen soil layer of the terrain in which the pile is installed, at least a portion of said length defined by a series of ribs extending transversely outwardly of said sheath member relative to a lengthwise axial line as an extensible section, the lower end of said sheath member being secured to the pile at or below a position corresponding to the bottom region of said active or seasonally frozen soil layer, the upper end of the sheath member being secured to the pile at a position above the ground surface, and a fluid material being filled in a space defined between said pile and the sheath member.
- 11. In a frost damage proofed pile installed in a frigid area where the pile is subjected to a frost heaving force, the improvement comprising a sheath unit, said sheath unit having a cylindrical member of an inside diameter slightly larger than the outside diameter of the pile and an axially extensible tubular member fitted on the outer periphery of said cylindrical member and having its upper and lower ends secured to said cylindrical member, said tubular member having at least a portion of its length defined by a series of ribs extending transversely outwardly of said sheath unit relative to a lengthwise axial line, with a fluid material being filled in a space confined between said cylindrical and axially extensible members, and wherin said sheath unit is fitted on the outer surface of the pile over a length greater than the thickness of an active or seasonally frozen soil layer of a terrain in which the pile is installed, the lower end of said sheath unit being secured to the pile at or below the bottom region of said soil layer.
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21. In a frost damage proofed pile installed in a frigid district where the pile is subject to a frost heaving force, the improvement comprising a plurality of pile units, each said pile unit having a pile segment cut to a predetermined length and an axially extensible tubular member fitted to the outer surface of said pile segment, said tubular member having at least a portion of its length defined by a series of ribs extending transversely outwardly of said tubular member relative to a lengthwise axial line and having its upper and lower ends secured to the outer surface of said pile segment at positions ahead of the upper and lower ends of said pile segment, with a fluid material being filled in the space between the pile segment and the extensible member,
and wherein a number of said pile segments are connected to one another for covering a distance longer than the thickness of an active or seasonally frozen soil layer of the terrain in which the pile is installed.
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29. In a frost damage proofed pile installed in a frigid district where the pile is subjected to a frost heaving froce, the improvement comprising a plurality of sheath units, each said sheath unit having in turn an axially extensible tubular member, said tubular member having at least a portion of its length defined by a series of ribs extending transversely outwardly of said tubular member relative to a lengthwise axial line and a pair of cylindrical sections fitted into and secured to both opening ends of the tubular member so that the mouth ends thereof are exposed to the outside of said extensible member, said cylindrical sections being of an inside diameter slightly larger than the outside diameter of the pile segment;
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wherein a number of said sheath units are connected to one another in tandem and placed over the pile for covering a predetermined length corresponding to the thickness of an active or seasonally frozen soil layer of the terrain in which the pile is installed; and wherein the lower end of the lowermost one of said sheath units is secured to the pile at or below the position corresponding to the bottom region of said active or seasonally frozen soil layer, wherein the upper end of the uppermost one of said sheath units is secured to the pile at a position above the ground surface, and with a fluid material being filled in a space defined between the pile and the sheath unit. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36)
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Specification