SU366380A1 - DEVICE FOR DETERMINING THE VALUE OF THE FAILURE OF PILES - Google Patents

Description

one

This invention relates to the field of construction.

Devices are known for determining the magnitude of failure of the piles and the height of the holding of a part of the hammer in dynamic isitia x driven piles, including a tape drive mechanism and a recorder with a recorder.

However, such devices do not provide reliable recording of the recorder to the tape of the transverse oscillations of the pile at the moment of impact due to deformation of the connecting elements, which leads to inaccurate measurements.

The purpose of the invention is the constant and reasonable clamping of the recorder to the tape when transverse vibrations of the pile occur at the moment of impact.

For this purpose, the recorder is made in the form of flat parallel springs fastened at the ends with interposed inserts between them, and the tape mechanism is equipped with a tape feed regulator. The latter is made in the form of a clamping roller, which interacts by means of a brush-tooth transmission through a gearbox with a drive.

Pa figs. 1 schematically shows the proposed device; in fig. 2 - tape mechanism.

The device includes a recording device made of two flat arms: N /, fastened to the end m, and m. On the inside of one of the springs are installed insert 2. On the free end of the recording device is fixed karandan; 3, in contact with the tape 4, which is placed on a flat pad 5.

Tape 4 is wound on the feed roller

6 of the tape drive mechanism 7, which also includes a clamping resilient roller 8, which guides the rollers 9, the receiving coil 10. the electric motor 11c. centrifugal regulator and gearbox 12.

The elastic roller 8 is mounted on the shaft 13 with the ability to slip certain loads and at the same time it is rigidly connected to the output shaft of the gearbox 12 using a gear transmission.

The shaft 14 of the receiving coil 10 is also connected to the shaft 13 with a gear and gear train, and the gears are rigidly fixed on both shafts.

The device works as follows.

On the clamp attached to the pile, a recording device is installed and the tape drive of the local stochism is turned on. 7. The force by which the elastic roller 8 applies to the directional rollers 9 the tape 4, implies its slip. The centrifugal regulator of the electric motor // ensures a constant curvature of rotation of the roller 8 and, therefore, a constant speed of movement of the belt 4. At the same time, the rotation speed of the receiving coil 10 changes as the belt is consumed due to the slippage of the shaft 13 relative to the roller 8.

The readings are recorded while the tape 4 is on pad 5.

When arising transverse oscillations of the pile at the moment of spring impact / provide a constant pressure of the pencil 3 to the tape 4.

A failure report obtained during tests allows us to determine the height I of a hammer falling by the following formula

81/2

where: V is the speed of movement of the mite,

5 - tape distance between two

marks for time 2i. t is the fall time of the hammer.

Subject invention

Claims (2)

1. A device for determining the failure rate of piles and the height of the impact of the hammer during dynamic tests of driving piles, including a tape-carrying mechanism and a recorder with a recorder, characterized in that in order to ensure a constant and uniform pressing of the recorder to In the case of transverse oscillations of the pile in MOMeirr, the recorder was made as a specimen at the ends of flat parallel lines with spacers located between them, and the tape drive mechanism was equipped with a regulator feeding mites. 2. The device according to claim 1, characterized in that the ribbon feed regulator is made in the form of a pressing and rolling roller, which cooperates by means of a gearshift transmission through a reducer with a drive.