RU2090716C1 - Device for compaction of concrete mixes in installation of bored electrohydraulic pulsed piles - Google Patents

Abstract

FIELD: construction; applicable in manufacture of bored piles, construction of cast-in-situ foundations, underground concrete structures with use of electric discharge technology. SUBSTANCE: device has driven rod with electric discharge plant and electrodes located on its end, pressure pickup with numerical indicator installed in electric discharge unit above electrodes and also electromagnetic relay for engaging and disengaging of electric discharge unit connected with pressure pickup, and electric motor for raising and lowering the rod with reduction gear and magnetic starter installed in body of device resting on bulky base. EFFECT: higher efficiency. 2 cl, 1 dwg, 1 tbl

Description

 The device relates to the field of construction production and can be used in the manufacture of bored piles, the installation of monolithic foundations, underground concrete structures using electric discharge technology.

 A device for sealing concrete mixture [1] containing an electric discharge installation with electrodes placed at the end of the rod.

 However, the use of this device is characterized by increased energy consumption and leads to the appearance of inhomogeneities in the pile body.

It is also known a device for compacting concrete mixture in a well, including a drive rod, an electric discharge installation with electrodes placed at the end of the rod [2]
The disadvantage of this device is the low quality of work, which consists in under-compaction of one or another level of a bored pile when climbing to a new horizon, which ultimately leads to a violation of the bearing capacity.

 The aim of the invention is to improve the quality of work. This is achieved by the fact that the device is equipped with a pressure sensor with a digital numbering device located in the electric discharge unit above the electrodes, as well as an electromagnetic relay for switching on and off the electric discharge unit, connected to the pressure sensor and the rod raising and lowering motor with a gearbox and a magnetic starter installed in the device case .

 Figure 1 shows a schematic diagram of a device.

 A device for compacting concrete mixtures during the construction of bored electrohydropulse piles consists of a drive rod 1, an electric discharge installation with electrodes 2 located at the end of the rod, a pressure sensor 3 with a digital numbering device located in the electric discharge installation above the electrodes, an electromagnetic on and off relay 4 of the electric discharge installation, connected to the pressure sensor 3, and the electric motor 5 of lifting and lowering the rod 1 with a gearbox 6 and a magnetic trigger 7 installed in the housing 8 of the device VA, based on a massive base 9, while the device is equipped with a device 10 for current leads 11 and connecting wires placed inside the rod.

 The device operates as follows. Drill a well of the required diameter. At 2/3, the well is filled with concrete and a device is placed above it so that the hole in the massive base 9 is coaxially above the well. The electric motor 5 is started, the rod 1 is automatically lowered into the well, before reaching the bottom by the value of h, the step of the compaction level, and the lowering of the rod 1 occurs until the electrodes 2 are hidden by the upper concrete layer. The extension of the rod 1 occurs simultaneously with the extension of the casing 12, which is located on the upper base of the electrodes 2. Its locks are automatically closed and the casing 12 reliably protects the threads of the rod 1 and the sensor 3 from clogging with concrete.

A. When lowering the rod 1 into the well, the pressure sensor 3 detects the pressure R ₁ / it is torrified in advance, based on the processed experimental data /. From the pressure sensor 3, the signal enters the electromagnetic starter 7 and stops the engine 5. The lowering of the rod 1 stops.

 B. When the motor 5 is turned off, the electromagnetic relay 4 starts the electric discharge installation. The electric discharge installation operates in automatic mode. An operating voltage is applied to the electrodes via a high-voltage cable 11, where an electric discharge or a series of discharges occurs, leading to compaction of the concrete mixture and its activation, compaction of the soil in the borehole walls. As a result of air displacement, compaction of pores and grains of soil, the concrete mix penetrates into the walls and base of the well. The volume of concrete in the well decreases by Δh. The value of Δh does not depend on the degree of filling the volume of the well with concrete. It is determined by the type of soil, its density and the radius of the compaction level. Experimental studies have shown that the increment in the volume of concrete mix Δh spent on compaction of the side surface and the base in the area of the electrodes for different soils is different. The table shows the data obtained as a result of the tests.

The pressure in the seal zone changes to P ₂ . The electric discharge installation is switched off.

B. The pressure sensor detects the pressure drop P ₁ to P ₂ . The magnetic starter 7 is triggered and starts the electric motor 5 and, thereby, "gives" a command to raise the rod 1 by a value of 2h, corresponding to the pressure P ₃ . At the initial stage of creating piled piles, the pressure increment Δh at step h can be considered the same.

D. The pressure sensor 3 is equipped with a digital numbering device, on which the positions corresponding to each lifting of the boom with an interval h are sequentially fixed. When the next pressure value is reached, for example, P ₄ , the numerator works, the pressure sensor 3 sends a signal to the relay 4, after lifting the rod, it starts the electric-discharge installation and carries out the process of further compaction of the concrete mixture in the well. At the time of lifting the rod 1, the receiving device 10 pulls the current-carrying cables 11, the connecting wires and supports them in a taut position.

 D. In the future, the process is repeated until the well is filled with concrete mixture to the full height, and its deficiency during compaction is compensated for during a break in work.

 As the bar rises, the locks of the casing 12 open, the casing is folded and together with the bar takes the transport position. The electric discharge installation is switched off.

 The proposed device allows more efficient construction of printed piles. The pile has a uniform trunk, withstands higher statistical loads, its bearing capacity increases. Time for work is reduced, and their cost is reduced.

Claims (2)

 1. The compaction device for concrete mixtures during the construction of bored electrohydropulse piles containing a drive rod, an electric discharge installation with electrodes located at the end of the rod, characterized in that it is equipped with a pressure sensor with a digital numbering device installed in the electric discharge installation above the electrodes, as well as an electromagnetic switching relay and shutdown of an electric discharge installation connected to a pressure sensor and an electric motor for raising and lowering the rod with a gearbox and a magnetic starter, copulating in the apparatus body, based on the massive base.  2. The device according to p. 1, characterized in that it is equipped with a receiving device for current leads and connecting wires placed inside the rod.

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