Structure for preventing frost heave damage to an underground structure and a method of installing the same
First Claim
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1. A method of installing a frost heave damage preventive structure in soil having a seasonal freezing layer and a maximum freezing depth, the method comprising:
- excavating a pile hole in the soil to a depth below the maximum freezing depth, wherein the excavated pile hole has a predetermined diameter and depth;
inserting a pile into the pile hole, said pile having a plate-like reaction member which projects from an outer circumferential surface of the pile, wherein said reaction member is spaced from a bottom end of the pile and the predetermined diameter of the pile hole is greater than the diameter of the reaction member;
driving the pile into the pile hole so that said reaction member is positioned at the bottom of said excavated pile hole below the maximum freezing depth; and
back filling a space over the reaction member between said pile hole and said pile outer surface.
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Abstract
A durable frost heave damage preventive structure of underground structures applicable easily and at low cost to many different kinds of underground structures. The frost heave damage preventive structure includes a plate-like reaction member (7) provided at the bottom of an underground structure (1) approximately in parallel to a freezing front in the ground.
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Citations
9 Claims
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1. A method of installing a frost heave damage preventive structure in soil having a seasonal freezing layer and a maximum freezing depth, the method comprising:
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excavating a pile hole in the soil to a depth below the maximum freezing depth, wherein the excavated pile hole has a predetermined diameter and depth;
inserting a pile into the pile hole, said pile having a plate-like reaction member which projects from an outer circumferential surface of the pile, wherein said reaction member is spaced from a bottom end of the pile and the predetermined diameter of the pile hole is greater than the diameter of the reaction member;
driving the pile into the pile hole so that said reaction member is positioned at the bottom of said excavated pile hole below the maximum freezing depth; and
back filling a space over the reaction member between said pile hole and said pile outer surface. - View Dependent Claims (2, 3)
inserting, prior to insertion of said pile, an earth guard into said pile hole; and
removing said earth guard from said pile hole following said back-filling operation.
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4. A frost heave damage preventive structure for protecting piles supporting a ground structure, located in a cold region, from damage due to frost heave of soil and thaw settlement, said frost heave damage preventive structure comprising:
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a plate-like reaction member provided on a side face of a lower portion of each of the piles, wherein said plate-like reaction member extends approximately in parallel to a freezing front of the ground, and said reaction member is positioned in the ground at a depth which is deeper than a maximum freezing depth of the ground. - View Dependent Claims (5, 6, 7, 8, 9)
excavating a pile hole which is larger than a planar shape of the plate-like reaction member, wherein the pile hole extends down to a planned buried position of the reaction member;
installing the pile, provided with the reaction member on the side face thereof, in the pile hole; and
back filling a void in the pile hole above the reaction member.
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Specification