CS233181B1 - Method of increasing the load-bearing capacity of pile-bored piles - Google Patents

Abstract

The method according to the invention consists in making a borehole, filling it with crushed stone or gravel, closing its upper part with a casing with a lid, and introducing cement slurry under the necessary pressure. The essence of the invention is that the pressure in the borehole is maintained at least until the compressibility of the concrete mixture equals the compressibility of the prestressed soil around the casing and the base of the pile.

Description

(54) Method of increasing the bearing capacity of pile-bored piles

The method according to the invention consists in making a borehole, filling it with gravel or gravel, closing its upper part with a casing with a lid, and introducing the cement slurry under the necessary pressure. The essence of the invention is that the pressure in the borehole is maintained at least until the compressibility of the concrete mixture equals the compressibility of the prestressed soil around the jacket and the pile base.

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BACKGROUND OF THE INVENTION The present invention relates to a method for increasing the load-bearing capacity of pile concretes. In this way, the soil strength parameters in the vicinity of the pile are increased, thereby increasing the bearing capacity of the pile. Existing equipment is used to carry out the process and almost no additional costs are incurred ·

Well piles are commonly made by incorporating concrete mix into the wells. In some geological conditions, borehole walls need to be reinforced with casing casings that are pulled out during concreting or after they are filled with concrete. In the aquifers, the entire well is punched out with a casing into which a pipe for supplying the cement slurry under pressure is introduced. The borehole is then filled to the required grit or gravel, and then closed with a lid at the top of the future pilot's pile head. Subsequently, the grout is filled with cementitious suspension under a pressure of 200 to 300 KPa at this pressure. parameters of the soils in which the piles are concreted.

This condition improves the pile manufacturing process of the present invention.

The above mentioned disadvantages are eliminated by the method of increasing the load-bearing capacity of the concrete pile piles. In this method, a borehole is produced which is filled with grit or gravel and the like. The essence of the invention is that the pressure is maintained at least until the compressibility of the concrete

233 181 the DC mixes out the compressibility of the soil around the pile and the pile foot.

The method according to the invention results in an increase of the pile bearing capacity of 20 to 50% depending on the geological properties of the surrounding soil. As a result of this increase in load-bearing capacity, it is possible to design more economically, since the increased load-bearing capacity can be predetermined and included in the project.

In the accompanying drawings Fig. 1 is a longitudinal section ^piló-; one with a casing with a lid with a segment closure. Giant.

again shows a longitudinal section through a pile with a casing closed by a staple lid. The top view shows the various types of the lid of the casing lid: segmented in Fig. 3, stapled in Fig. 4 and spiral anchors in Fig. 5.

The method according to the invention is carried out in such a way that a borehole J is filled in a conventional manner, which is filled with sorted grit or gravel 2 and the like. or a cross closure 7 anchored by spiral anchors 8. This last closure is suitable for greater overpressure in bore hole J. A pressure pipe 2 for supplying a cement slurry under a pressure of 200 to 300 KPa or more passes through the lid. This pressure is determined by the mechanical and physical properties of the surrounding soil and by the length, diameter and future pile load. Depending on the pump type, several piles can be concreted. After the borehole 1 is filled, the overpressure is maintained there until the concrete in the borehole hardens to such an extent that the earth pressure cannot deform the concrete mixture. The injection pressure biases the soil around the pile shaft and the heel of the pile, ie increasing its original state of stress. The hydration heat accelerated the consolidation of the prestressed soil, so that the stress state of the soil around the shaft and the pile foot is equalized and consolidated with an injection pressure that is normally greater than the geostatic pressure. This partially consolidated soil and pile surroundings will increase its shear parameters. This will increase the shear strength of the soil and thus the bearing capacity of the pile. The described procedure makes it possible to control the injection pressure with respect to the length and diameter of the pile and the geological conditions, and thus to individually increase the load-bearing capacity of the individual piles.

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The invention can be utilized in virtually all geological conditions when carrying out piles in boreholes. Managing the soil consolidation around the pile skin and pile foot increases the pile bearing capacity, improves foundation conditions and reduces the risk of inputting erroneous input data into calculations. Depending on the geological conditions of the borehole profile, the pile capacity can be increased by 20 to 50

-4 OBJECT OF THE INVENTION

Claims (2)

233 181 Method for increasing the load-bearing capacity of pellets in boreholes, comprising making a borehole, filling it with grit, gravel, etc., in closing its upper part with a lid with a lid and in guiding the cement slurry under necessary pressure, characterized in that the pressure is maintained at least When you press the action of the concrete mixture is equal to the compressibility of the soil around the sheath and the base of the saw. 2 drawings 233 131