SU953176A1 - Apparatus for forming expansions - Google Patents

Description

one

BACKGROUND OF THE INVENTION The invention relates to the drilling of wells with wider piers for bridge supports and other engineering structures.

A device for the formation of a broadening, which produces broadening due to soil compaction using a hydraulic cylinder 1, is known.

A disadvantage of this device is the presence of a hydraulic drive.

The closest in technical essence and the achieved result to the invention is a device for forming an embedment, including a drill string and cutting knives placed on it, a receiving bunker and a hammer. The broadening is done using the knives with the knives that interact with the hydraulic hammer 2.

A disadvantage of the known device is its limited application conditions, i.e. the need for water for excavation, the unreliability of the hydraulics in shock loads and bulkiness. Such a device is practically impractical to use in the construction of bored piles of overpasses, floodplain sections of bridges, etc., since a large

flow water for flushing wells.

The aim of the invention is to reduce energy consumption during operation.

This goal is achieved by the fact that a device for forming an extension, including a drill string and cutting knives placed on it, a receiving hopper and a drummer, is equipped with a turntable with a central hole and openings and a knob, Q with fixed working edges and shanks, the receiving bunker is equipped with spherical supports with the possibility of their interaction with the turntable, while the drummer is made in the form of cargo that freely engulfs the drill string and is installed with the possibility of its interaction with the shanks ozhey.

In addition, the working edge of the knives can be performed along a helix.

FIG. 1 shows a device located in the well, a section; in fig. 2 - device located in the well with widening, incision; in fig. 3 shows section A-A in FIG. one; in fig. 4 is a view B in FIG. 1 (detail of the cutting knife).

The expander consists of a drill string 1 with a drummer 2 loosely seated on it and a receiving hopper 3 with stiffening ribs. On the upper plane of the receiving hopper 3 there are spherical supports 4, on which the outer circle is supported by a turntable 5 with a central hole b and openings 7. On the turntable there are fixed hinge supports 8 and cutting knives 9 with a shank 10 and the main part 11, which is asymmetrically developed relative to the shank ten.

The expander works in the following way.

A discharged drummer 2, which is hooked by a sling to a crane hook with a grappling stock of a cargo tackle, strikes the shank 10 of the cutting knives 9, which by the main part 11 are embedded in the ground. Through the ball bearings 4, the remainder of the impact energy is transferred to a receiving bin 3, which distributes it over the ground. By using cutting blades 9 made along a helical line, a rotational reactive force is produced which creates movement of the turntable 5 in the horizontal plane. The shocks create vibration and discharge of the soil through the openings 7 into the receiving hopper 3. When removing the expander to the surface, the soil is removed from the receiving hopper through the gates. If necessary, the drill string is rotated while the reactive force decreases as the broadening is developed. The position of the turntable is fixed by the central hole 6 and the ball bearings 4. When developing the broadening, the number of cutting knives and their type is established depending on the category of soil. For this purpose, rotary circles 5 of different diameters and with different numbers of articulated supports 8 are included in the broader. It allows the installation of an incomplete set of cutting knives 9 on the articulated supports.

Cutting knives 9 can be flat or deployed along a helix. The main part 11 can be made with intake blades, a wedge, multi-tooth, etc. For free fall, when the drummer 2 is raised, the main part 11 is arranged with a tangier shank 10.

The use of an expander expands the field of application of casing drilling technology. Cutting knives, made along a helix, facilitate the angle of attack of the cutting soil. The use of a receiving bin creates conditions for controlling the formation of broadening due to excavation of a certain volume to the surface. The jet turn of the cutting knives does not require additional energy, which is especially effective when developing rocky and semi-rocky soils.

The extender is used in conjunction with a light-duty mechanism, its use creates savings in labor, electricity, does not require complex hydraulic and other devices.

Claims (2)

1. A device for the formation of the broadening, including the drill string and the cutting knives placed on it, the receiving a bunker and a drummer, characterized in that, in order to reduce energy intensity, it is provided with a turntable with a central hole and openings and knives with a working edge and shafts hinged on it, and the receiving bunker is equipped with ball bearings with the ability to interact with the turntable, with This drummer is made in the form of cargo that freely encompasses the drill string and is installed with the possibility of its interaction with the shanks of the blades. 2. The device according to claim 1, characterized in that the working edge of the knives is made along a helix. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 589335, cl. E 02 D 17/148, 1976. 2. USSR author's certificate No. 355299, cl. E 02 D 7/28, 1969.