SU829790A1 - Device for making holes with expanded portions for cast-in-place piles - Google Patents

Description

(54) y (: WELLING FORMATION

with BROADENING for PAILING PILES

one

The invention relates to construction and can be used in the construction of buildings and structures on weak clay soils.

Known well dilator, including pnevmocamera of elastic material, air duct and limiters to inflate the chamber, made in the form of rigid lobe shutters, forming in terms of a circle, the diameter of which is larger than the diameter of the well 1.

Closest to the proposed technical essence and the achieved result is a device for broadening a well, including a housing, a working medium supply mechanism and an elastic chamber, which moves apart in the radial direction under the pressure of fluid pumped by actuator 2,

The disadvantage of this device is that it should be immersed only in a well-prepared well-sized well and cannot be used to form a well.

The aim of the invention is to ensure the formation of wells for ramming piles.

This goal is achieved by the fact that the outer surface of the housing, the device is made with a helical groove in which an elastic chamber is located, is connected to the working medium supply mechanism, while the working medium supply mechanism is made in the form of a power cylinder, the piston mounted on the output end of the rod inside the body with a tip.

FIG. 1 shows a device immersed in the ground, a general view; in fig. 2 - the same at the time of formation of the helical broadening of the well; in fig. 3 - educated

5 well, longitudinal section.

. The device for the formation of wells with the advancement contains a mechanism for supplying the working medium, including the power cylinder 1, mounted on the housing 2 with the tip 3, on the end of the shaft 4 of the power

A cylinder 5 is mounted on the cylinder; it has the ability to move in the housing;

placed in the form of a tape, an elastic chamber 6 and at one end hermetically sealed into an opening 7 in the lower part of the body so that the cavities of the body and the camera communicate, and the other is fixed to the upper part of the body at or below the hole 8 by means of a clamping mechanism 9 and the bolt 10 mounted in the plate-limiter 11, the crush chamber cavity 12 is filled with a working medium, the volume of which is larger than the volume of the expanded chamber, the thickness of the unfilled working medium of chamber 6 is less than the depth of the groove.

The device works as follows.

The power cylinder 1 is connected to the hydraulic system of the pile-driving aggregate (conventionally not shown), by which it is immersed in the soil of the well formation device. The force of the indentation on the device is transmitted through the pile cap of the aggregate, into which the device, using the same mechanism as the pile, is turned on before immersion. The device is pushed into the ground of the foam-like structure or into the leader well to a predetermined depth. Then, the process of forming a helical broadening of the wellbore begins.

To protect the wellhead that forms the well from damage (to avoid soil bulging), the restrictor plate And, before immersing the device in the soil, is installed and fixed on the upper part of the housing 2 at a height corresponding to a given depth of the well.

Forming a helical extension of the wellbore is as follows.

The cylinder I is turned on, with the piston 4 moving downwards in the housing 2 by means of a shunt 4, which pumps the working medium through the opening 7 into the chamber 6. Under pressure, the chamber inflates and compresses the soil, forming a helical broadening of the wellbore. Then, the power cylinder switches to lift. Porschel shuffles up, sucking working environment in

pussy space. When the stem moves upward under the piston, a rarefied space is formed, which is filled with a working medium consisting of a compressive undergrowth and elastic forces of the elastic material of the chamber. When the device returns to its original position, the camera takes on its original shape and size.

The device is removed from the well, and the pile-driving unit is transferred to the next foundation and the cycle is repeated.

The fabricated wells are reinforced and molded according to techniques known for bored piles. In this way, rammed screw piles are formed, the use of which in construction allows, through the compaction of walls and the bottom of a well, to increase the bearing capacity of piles for the action of vertical and horizontal loads and to reduce the consumption of materials for the foundation.

Claims (2)

1. A device for the formation of a well with an extension under the stuffed piles, including a housing with a tip, an elastic chamber and a working medium supply mechanism, characterized in that, in order to ensure the formation of wells under the stuffed screw piles, the outer surface of the housing is made with a helical groove in which placed elastic chamber connected to the feeder working environment. 2. The device according to claim 1, characterized in that the mechanism for supplying the working medium is made in the form of a ram, at the output end of the brush of which a piston is installed, placed inside the housing with a tip. Sources of information taken into account in the examination 1 USSR author's certificate number 414367, cl. E 02 D 17/148, 1971. 2 USSR author's certificate No. 196629, cl. E 02 D 17/148, 1966. (f