RU2523264C2 - Shell pile with filler material - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: shell pile with filler fixed inside the pile and cap on the top, installed in permafrost soil, with internal cavity filled with nonfrost-susceptible material. The cavity is filled partially, just above the level of lower boundary of layer of seasonal freezing and thawing of the soil, in this case the upper surface of filler is sealed against the ingress of water.

EFFECT: increase of pile reliability, reduction of material consumption when manufacturing the piles, work cheapening.

10 cl, 2 dwg

Description

The invention relates to the construction of foundations and foundations using piles-shells in areas of permafrost.

During several years of operation, the pile casing is completely filled with water. In winter, the water freezes, and the ice formed in the expansion process breaks the walls of the pile. The presence of water also contributes to bulging piles.

To prevent such damage, the pile cavity from the base to the top is filled with some non-porous aggregate: sand, soil, cement-sand or other hardening mixtures.

Closest to the invention in its essence and the achieved result is the currently widely used construction of piles with filling the cavity with sand or cement-sand mortar. This design is described in the article: Cheverev V.G., Pustovoit G.P. and others. "Stabilization of tubular pile foundations on heaving soils" - Foundations, foundations and soil mechanics. No. 6, 2006, p.25 (prototype).

The disadvantages of the above design:

- the cavity of the pile completely fill, which leads to increased consumption of material and the cost of work.

The cavity of the pile pile shell is usually reliably protected from atmospheric precipitation by a plug device at the upper end of the pile. However, this does not save from the appearance of water inside the pile. The analysis by the author showed that during the operation of the pile-sheath due to the difference in ambient temperature (air or soil) and warm air, water condensate forms inside the empty sheath. It condenses on the inner surface of the pile walls. The above conditions necessary for the formation of water condensate are available only in space from the level of the lower boundary of the layer of seasonal freezing-thawing of the soil to the upper end of the pile-shell. In this space, the temperature can take a positive value. After a few years, the volume of this condensed moisture increases, and the pile casing is gradually completely filled with water.

Below the lower boundary of the layer of seasonal freezing-thawing of the soil, the temperature of permafrost soil and air in the pile cavity constantly remain negative, and water condensate cannot be formed by definition.

The aim of the invention is to increase the reliability of piles, reducing the consumption of material in the manufacture of piles and cheaper work.

The goal is achieved in that the cavity is partially filled, only above the lower boundary of the layer of seasonal freezing-thawing of the soil, while the upper surface of the filler is sealed against water penetration.

The purpose of the invention is also achieved by the following structures:

as a filler, a prefabricated cork is used, which is installed inside the cavity close to the inner walls of the pile casing;

- the cork is made of heat-insulating material with closed pores;

- the cork is made of heat-insulating material, hermetically packed in a waterproof film;

- the cork is made of a heat-insulating material coated with a sealed durable waterproofing coating;

- the top surface of the aggregate is placed close to the plug;

- the upper surface of the aggregate is located at the level of the design lower boundary of the flood waters, and a hole is made in the pile wall at this level;

- the upper surface of the aggregate is located at the level of the design upper boundary of the flood waters, and a hole is made in the pile wall at this level;

- in the cavity of the pile at the level of the lower boundary of the layer of seasonal freezing-thawing soil establish a support partition;

- the plug is attached to the cap on the upper end of the pile using connecting elements.

Comparative analysis with the prototype shows that the inventive method is distinguished by the totality of the above features. This allows us to conclude that the sign of "novelty."

Comparison not only with the prototype, but also with other technical solutions in the art did not allow them to identify signs that distinguish the claimed method from the prototype, which allows us to conclude that the criterion of "significant differences".

Figure 1-a shows a prototype shell; figure 1-b shows the pile-shell according to claim 1 of the claims of the invention (FI); figure 1-c shows a pile shell according to claim 2 F.I .; figure 1-d shows a pile sheath according to claim 10 F.I.

Figure 2-a shows a pile-shell according to claims 7-8 F.I.

Description of Constructions

- The cavity 6 of the pile casing 1 is partially filled with non-porous aggregate 3. As a filler, a prefabricated inventory plug (for example, foam) is used. It occupies a space from the level of the lower boundary 7 of the seasonal freezing-thawing layer of soil 4 to the plug 5, while the upper surface of the aggregate is sealed against penetration of water by the sealant 9 (Fig. 1-b). Non-porous aggregate 3 significantly reduces the volume of air in the cavity, which is the initial product for the formation of condensate. The resulting small volume of water is not dangerous, and can not destroy the pile during expansion during freezing. As the sealant 9, in particular, a thin layer of cement mortar can be used.

- At the level of the boundary 7, a support partition 8 is arranged in the pile cavity, which can be continuous waterproof if it separates the non-porous aggregate 3 in the form of a filling of loose material or hardening solution from the lower unfilled part of the pile 1 (Fig. 2a). With non-porous aggregate 3 in the form of an inventory plug, the support wall 8 may be non-continuous (Fig. 1-c).

- In the lower part of the cavity, water condensate does not form, because there the temperature of permafrost is negative.

- The inner cavity 6 of the pile-shell 1 close to its walls can be partially filled with non-porous aggregate 3 in the form of an inventory plug, for example, a cylinder of foam or concrete (Fig. 1-c). Non-porous aggregate 3 in the form of a cork is lowered into the cavity of the pile to the level of the lower boundary 7 of the layer of seasonal thawing of the soil 4, where the support partition is installed 8. The cork can be made of other materials specified in paragraphs 3-5.

- Another option for fixing the position of the plug 3 is its attachment to the plug 5 using the connecting element 14 (Fig.1-d).

- Fig. 2-a) shows a pile casing 1 filled with non-porous aggregate 3 with a seal 9 located below the lower design level of flood water 11. The upper design level of surface water is indicated by the number 13. In the wall of the pile 1 at this level 11 is arranged through hole 12.

Flood water at the beginning of spring flood fills the cavity of the pile shell above the level of the seal 9 through the hole 12. After the flood ceases, water flows out of this hole and the cavity above level 9 remains empty (Fig.2-b). Condensation that may form in the empty cavity above the opening 12 flows out through this opening. This design allows to reduce the volume of aggregate in comparison with the option depicted in the following figures.

- Figure 2-c shows another embodiment of the device of the pile-shell 1, in which the drain hole 12 is arranged above the design level of surface water 13, for example in a lake. Figure 2-d shows a pile after lowering the surface water level. This option is convenient for high chemical aggressiveness of flood waters.

Claims (10)

1. A pile-sheath with a filler fixed inside the pile and a plug on the upper end, installed in permafrost soil, with an internal cavity filled with non-porous material, characterized in that the cavity is partially filled, only above the lower boundary of the layer of seasonal freezing-thawing soil, while the upper surface of the aggregate is sealed against penetration of water. 2. The pile according to claim 1, characterized in that the prefabricated plug is used as a filler, which is installed inside the cavity close to the inner walls of the pile-shell. 3. The pile according to claim 2, characterized in that the cork is made of heat-insulating material with closed pores. 4. The pile according to claim 2, characterized in that the cork is made of heat-insulating material, hermetically packed in a waterproof film. 5. The pile according to claim 2, characterized in that the cork is made of a heat-insulating material coated with a sealed, durable waterproofing coating. 6. Pile according to one of claims 1 to 5, characterized in that the upper surface of the aggregate is placed close to the plug. 7. Pile according to one of claims 1 to 5, characterized in that the upper surface of the aggregate is located at the level of the design lower boundary of the surface water, and a hole is made in the pile wall at this level. 8. A pile according to one of claims 1 to 5, characterized in that the upper surface of the aggregate is located at the level of the design upper boundary of the surface, and a hole is made in the pile wall at this level. 9. A pile according to one of claims 1 to 5, characterized in that in the cavity of the pile at the level of the lower boundary of the layer of seasonal freezing-thawing of the soil, a support partition is mounted on which the aggregate rests. 10. Pile according to one of paragraphs.2-5, characterized in that the cork is attached to the cap on the upper end of the pile using connecting elements.

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