RU173756U1 - DRIVING TRANSFORMABLE PILES - Google Patents

Abstract

The utility model relates to construction, in particular to pile foundations laid in all soils, in particular in loose and loose ones. The objective of the utility model is to increase the bearing capacity of a driven pile by increasing friction. This is achieved by the fact that a driven transformable pile consists of a trunk 1 with a pointed tip 2 and an injection tube 3 of a conical shape made of plastic with a cross section in the form of a four-beam star 4 with an axial hole.

Description

The utility model relates to construction, in particular to pile foundations laid in all soils, in particular in loose and loose.

Known reinforced concrete driven pile (patent RU for utility model No. 113277, publ. 02/10/2012, Bull. No. 4), characterized in that it contains a reinforced concrete case of square or rectangular cross section, inside of which there is a reinforcing cage. An injection pipe is fixed along its axis, one end of which is open, and the other is closed by a cork.

The disadvantage of the design of such a pile is the high metal consumption, manufacturing complexity, low bearing capacity.

Known driving pile (patent RU for invention No. 2386749, publ. 04/20/2010, Bull. No. 11), adopted as a prototype and consisting of a barrel with an axial hole, a pointed tip with an annular base and a conical shell with a tip, the cavity inside the shell is filled with hardening solution. At the base of the tip there is a threaded hole closed by a threaded plug with a stem.

The following features of the prototype coincide with the essential features of the utility model: a barrel with a pointed tip and an injection tube.

The disadvantages of the known piles are the complexity of the design, high material consumption, low bearing capacity, since the bearing capacity of a hanging pile is determined by the resistance of the sum of the friction forces along its lateral surface and the soil under the tip.

The objective of the utility model is to increase the bearing capacity of a driven pile by increasing the friction force.

This is achieved by the fact that the driven transformable pile consists of a barrel with a pointed tip and a conical injection tube made of plastic with a cross section in the form of a four-beam star with an axial hole.

This set of essential features is unknown from the prior art. Thus, the claimed solution meets the criteria of the utility model of "novelty."

A utility model is illustrated in the drawing, where in FIG. 1 shows a diagram of a driven transformable pile; in FIG. 2 - section A - A in FIG. one.

A driven transformable pile consists of a barrel 1 of length L with a pointed tip 2. On the central axis of the barrel 1 is an injection tube 3 made of plastic, conical in shape. In the sectional plane of the barrel, the tube has the form of a four-ray star 4, in the center of which an axial hole is located. Rays 4 intentionally weaken the cross section of the trunk 1 for more confident its wedging. Beam sizes:

for a square section: 0.8 * a and 0.5 * a , where a is the side of the trunk section 1;

for a rectangular section: 0.8 * a and 0.5 * b, where a , b are the sides of the trunk section 1, with a being the larger side;

 for a circular section: 0.8 * D and 0.5 * D, where D is the diameter of the trunk section 1.

и диаметр d отверстия инъекционной трубки 3 напрямую зависят от модуля деформации грунта Е, точнее от его средневзвешенного значения, так как только в очень редких случаях свая будет находиться только в массиве грунта одного типа. Найти средневзвешенное значение модуля деформации Е можно по известной формуле:Length

and the diameter d of the hole of the injection tube 3 directly depends on the soil deformation modulus E, more precisely, on its weighted average value, since only in very rare cases will the pile be in only one type of soil mass. You can find the weighted average value of the deformation modulus E by the well-known formula:

where E is the modulus of soil deformation;

h is the thickness of the soil layer.

была сведена в таблицу 1.The optimal dependence of d on

was summarized in table 1.

The diameter of the lower end of the tube is taken equal to 1 cm.

, d находятся методом интерполяции.Intermediate values

, d are found by interpolation.

The trunk 1 with a pointed end 2 is immersed in the ground to a predetermined depth. In an injection tube 3 of a conical shape, an non-explosive destructive substance (NRV) is poured, which during the chemical reaction increases in volume by 2-3 times. Non-explosive destructive substance (NRV) introduced into the tube 3 was obtained by fine grinding of cake; the plasticizer was introduced with water during mixing or in dry form during grinding. Sint NRV was obtained by roasting for 1 hour at a temperature of 900 ° C of the raw mixture, including calcite and alkali-containing components. As an alkali-containing component, soda ash and alkaline runoff of caprolactam production (SCHSPK) were used. Plasticizer - an integral part of NRV, introduced after firing, was technical lignosulfonate (LST). The cross section of the barrel can be made square, rectangular, round.

Within 1-2 days using plastic rays 4, the upper part of the barrel 1 is wedged.

A pile from a prismatic is transformed into a pyramidal. The increase in the area of contact and the creation of additional pressure on the ground, when wedging the upper part of the barrel 1, increases the value of the friction force. This allows you to increase the bearing capacity of piles by 30-40%.

Claims (1)

A driven transformable pile consisting of a barrel with a pointed tip and an injection tube, characterized in that the conical tube is made of plastic with a cross section in the form of a four-beam star with an axial hole.

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