SU1545078A1 - Apparatus for ledelling ship-launching rail tracks - Google Patents

Abstract

The invention relates to a measurement technique and can be used for leveling in the construction and operation of the underwater part of hydraulic structures. The aim of the invention is to improve the accuracy of measurements through the use of ultrasound. The device contains a U-shaped base 8 mounted on the rail under investigation, a tripod 7 with a rigidly fixed axis along which the cup 10 can move with an ultrasonic transducer 11 placed in it and a rod 13 with a return plumb 2. The distance to the reference points is measured by an ultrasonic transducer located on a base rail 3, made of a material with zero buoyancy and tensioned parallel to the rail. 3 il.

Description

The invention relates to a measurement technique, namely, devices for underwater leveling of central rail tracks, and can be used for leveling in the construction and operation of the underwater part of hydraulic structures.

The purpose of the invention is to increase the measurement accuracy.

FIG. 1 shows a diagram of a device for the subsea leveling of ship-starting rail tracks; in fig. 2 is a view A of FIG. one; in fig. 3 0 the general scheme of installation of the device.

The device for leveling Sudo tnycKOBbtx rail tracks includes Measuring unit 1, equipped with a return plumb 2, and a basic guide 3 with reference points 4, installed parallel to the rail 5 with the possibility of tension by means of a tension device 6. Basic guide 3 made of a material with zero buoyancy, such as polypropylene.

The measuring unit is designed as a tripod 7; the lower part of which is provided with a U-shaped base 8 rigidly fixed on it, and the upper part with an axis 9 rigidly fixed on it. On the axis 9 with a possibility of longitudinal movement there is mounted a glass 10 with an ultrasonic transmitter 11 v placed in it by an ultrasonic flaw detector 12, for example, models DUK-66.

A pin 13 is in contact with the base guide 3 on the glass wall 10, the return plummet 2 is placed at the upper end. Constructive execution of ultrasonic flaw detector 12 includes synchronizer I, pulse generator 15, sweep generator 16, receiving path 17 and cathode ray tube (ЗЛТ) 18. The transfer of the mark to the basic guide 3 is carried out with a conventional level 19 and a batten 20 from a reference frame 21.

The device works as follows.

Above the controlled rail 5 in parallel, at a distance of 200-300 mm, the base guide 3, made of polypropylene cord, is tensioned by the tension device 6, the reference points k are divided on the base guide 3 through 2 m, which

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quite reproduces the pattern of oscillations relative to the basic guide 3 in the form of a longitudinal profile. The marks on the baseline 3 at the 4P points, namely: at points C, D, A, B, D, E (Fig. 2) and so on throughout its entirety are determined by the conventional method using level 19 and batten 20 transfer them from the benchmark 21 „

Since the basic guide 3 is made of polypropylene and in the wetted state has approximately the same specific weight as water, it is easily stretched and will represent, in fact, an ideal straight line.

The diver’s task is to install the measuring unit 1 with the base 8 into the underwater geodetic point of the rail under study 5. By moving along the axis 9 fixed rigidly on the tripod 7, the cup 10 containing the radiator of the ultrasonic waves (ultrasonic waves, n), the diver achieves contact a rod 13 fixed on the wall of the glass 10 with a base guide 3. Then it sets the exit point of the ultrasonic waves (USV) exactly vertically below the anchor point k with a known absolute mark by means of slight movement and Tonnage blo ka forward - backward along the axis of the rail head 5, which is achieved by reverse plumb rod 2 and 13.

The next operation consists in ultrasound measuring the distance under water between the ultrasonic wave exit point and the base guide 3 o ALA for this purpose, for example, the ultrasonic control flaw detector 66 is used. Other ultrasonic devices that can determine the distance in water with high accuracy can be used. In principle, the ultrasonic flaw detector is the phenomenon of echo. According to the sound echo, one can judge about the presence of a barrier, from which the signal is reflected, in this case it is a foam-plastic cord 3, and the distance to it. To do this, it is necessary to note the time of passage of the sound wave back and forth, multiply this time by the speed of the wave in the water and divide by two. The generator 1 generates electrical pulses with a follow-up frequency defined by the synchronizer Ik and excites the piezoelectric element of the emitter 11. The emitted ultrasonic waves propagate in the form of a diverging beam of rays. Reflected from the guide and returning to the radiator, they are converted into electrical voltage pulses, which, after passing through the receiving path 17, are observed on the screen of the CRT 18 as a signal.

The distance to the baseline guide (polypropylene cord) 3 is determined in millimeters on a scale of a counting device placed on a CRT 18. Know this value by adding it and the constant distance between the outlet of the ultrasonic valve and the rail head 5 to the absolute mark of the baseline The absolute mark of the rail head 5 at the measured point is determined by the value of 3. After that, the diver is instructed to move to another measured point.

Constructive implementation of the measuring unit in conjunction with the basic guide and ultrasonic

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The flaw detector allows to perform underwater leveling works with high accuracy both in turbid and in pure water.

F - pmu l invention

A device for leveling the launching track, containing a U-shaped base associated with a glass in which a rod is placed, on the upper end of which a float is installed, a reference line setting unit and a measuring unit, characterized in that , the connection of the U-shaped base with c. is carried out through a tripod with a rigidly fixed axis parallel to the base, the cup is mounted on it with the possibility of longitudinal movement, with a measuring unit placed in it, ennym a ultrasonic flaw detector, and the reference line setting unit is configured as a column with bearing points and is made of a material with neutral buoyancy.

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Editor L. Kozoriz

Compiled by V. Nazarov

Tehred L. Serdkzhova Proofreader 0. Ciple

Order kQk

Circulation 391

VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab., D. V5

Production and Publishing Combine Patent, Uzhgorod, st. Gagarin, 101

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Claims (1)

Claim A device for leveling a ship, θ of rail tracks, containing a U-shaped base connected to a glass in which a rod is placed, at the upper end of which there is a float, a reference line setting unit and a measuring unit, which differs in that, in order to improve accuracy of measurements, the connection of the U-shaped base with the cup was made through a tripod with a rigidly fixed 2Q axis parallel to the base, the cup was mounted on it with the possibility of longitudinal movement, with the measuring unit placed in it, in the form of an ultrasonic flaw detector, and the block for specifying the reference line is made in the form of a cord with reference points and is made of material with zero buoyancy. 8cd A Fig-2