RU165407U1 - DRILLED WOODEN PIL WITH EXPANDED FIVE FOR PERMANENTLY FROZEN SOILS - Google Patents

Abstract

A drilling wooden pile with a broadened heel for permafrost soils, consisting of a trunk and several wooden shorts rigidly connected to the pile trunk, characterized in that the lower end of the pile is flat, forming the total area of the pile shaft and shorts, perpendicular to the pile shaft.

Description

The utility model (hereinafter referred to as the PM) relates to the field of construction of pile foundations of temporary structures on permafrost soils, which are used as the foundations according to the second principle [1]. It can, in particular, be used to build the foundations of the supports of temporary bridges.

Known design hammered wooden piles with a broadened heel and a pointed lower end below the broadening [2].

She is taken as a prototype PM. The broadening of the pile heel is intended to increase the bearing capacity of the pile when it is immersed in weak soils. It is also known that in permafrost soils, wooden (and other) piles are immersed, as a rule, in drilled wells [3]. The disadvantage of the adopted for the prototype PM piles with high bearing capacity on the ground is the impossibility of immersing it in permafrost soil in a driven way.

The technical task of PM is to develop the design of a wooden pile with an engraved heel for the construction of pile foundations in permafrost soils, which are used as a foundation on the 2nd principle.

The specified TK was solved due to the fact that a wooden pile with a broadened heel for permafrost soils, consisting of a trunk and several wooden shorties rigidly connected to the pile shaft, differs in that the lower end of the pile is flat, forming the total area of the pile shaft and shortys perpendicular to the pile shaft.

The proposed PM design is shown in the figure, where it is indicated:

pos. 1 - pile nozzle; pos. 2 - pile shaft; pos. 3 - coating of the pile section with anti-dam lubricant; pos. 4 - the upper boundary of the permafrost; pos. 5 - well; pos. 6 - wooden shorty; pos. 7 - coupling bolts; pos. 8 - pillow of coarse soil.

A pile with a broadened heel is made in the following technological sequence. A log (diameter 24-28 cm) for the trunk of pile 2 is sanded.

In the lower part of the trunk, platforms for attaching shorties 6 to it are shrunk. The depth of shrinkage should be within 3-4 cm, and the length within - 2 diameters of the pile shaft 2. Shortys 6 are made of two-edged beams. Their length should be equal to the length of the chipped sections on the pile shaft 2. Shorties 6 are bolted 7 (with a diameter of 20-22 mm) to the pile shaft.

Pile sections 3, placed within the active layer, are coated with anti-foam lubricant to reduce the freezing forces of piles with heaving soil.

Ready piles are lowered into drilled wells 5 on soil cushions 8. At the same time, the broadened heel of the pile must necessarily be located in the thickness of permafrost soil.

After installing the piles in the wells 5, the borehole space is filled with melt soil with compaction.

After cutting the heads of piles at the design elevation, nozzles 1 are laid on them, on which spans are installed, as a rule, of beam type or girders.

Thus, the proposed PM design will allow the construction of pile foundations (and even pile supports) of temporary bridges on permafrost soils, which are used as a foundation on the 2nd principle.

Used sources

1. SNiP2.02.04-88 Foundations and foundations on permafrost soils.

2. Instructions for the design of auxiliary structures and devices for the construction of bridges VSN 136-78 Fig. 60.

3. Yu.O. Targulyan Installation of pile foundations in permafrost soils. Stroyizdat 1978, Ch. III.

Claims (1)

A drilling wooden pile with a broadened heel for permafrost soils, consisting of a trunk and several wooden shorts rigidly connected to the pile trunk, characterized in that the lower end of the pile is flat, forming the total area of the pile shaft and shorts, perpendicular to the pile shaft.

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