JPS60164285A - Water bottom observing apparatus for dredging work - Google Patents

Abstract

PURPOSE:To forecast the amount of soil to be dredged as well as undulation of the water bottom immediately before the start of dredging by scanning in a sector plane including the vertical way below the water surface using a directional ultrasonic wave transmitter/receiver. CONSTITUTION:As a directional ultrasonic wave transmitter/receiver 1 scans in a certain sector plane S, the water bottom line B is shown on a plane position display 3 while transmission and reception information is inputted into an arithmetic circuit 4 via a sea bottom detection circuit 10, a gate wave generation circuit 14 and a counter 15 and information on the angle theta of direction is inputted into the circuit 4. Consequently, the bottom height difference H between the water bottoms B1 and B2 before and after the end of dredging is expressed by H=D0-Dthetacostheta when the water depth after the dredging is represented by D0 and the distance to the water bottom B2 at an angle theta of scanning Dtheta. This value is integrated with a circuit 5 at each transmission of an ultrasonic wave. If so, the area of a space between the water depth D0 and the water bottom B2 is shown on a display 6 as value proportional to the amount of soil to be dredged.

Description

[Detailed description of the invention] The present invention relates to an underwater observation device for dredging work.

In order to improve the efficiency of dredging work by a dredger, it is necessary to take into consideration the amount of soil on the water bottom to be dredged and the dredging capacity per unit time, and move the dredger just the right amount.

However, although the amount of soil in the dredged area can be roughly known from nautical charts, there is no appropriate means to specifically know the actual amount of soil immediately before dredging. The disadvantage was that movement could not be carried out properly, and there was a limit to the improvement in efficiency.

In view of the above problems, this invention enables accurate prediction of not only the ups and downs of the water bottom immediately before dredging, but also the amount of soil to be dredged, thereby contributing to highly efficient dredging work. This device was developed for the purpose of providing a directional ultrasonic transducer that scans in a fan-shaped plane including vertically downward under water, and a directivity angle detection device that detects the directivity angle of the transducer. A plane position display device that displays the water bottom line based on the directivity angle and the ultrasound transmission/reception time difference in that direction, and a vertical downward component of the directional distance information obtained from the directivity angle and the ultrasound transmission/reception time difference. and an arithmetic circuit that subtracts this value from a fixed set value for each ultrasonic transmission pulse, an integrating circuit that integrates the results of this calculation, and a display for the integrated results. It is.

Next, the present invention will be explained using examples.

Figure 1 is an explanatory diagram of the installed state of the embodiment of this invention! ! ;
FIG. 2 is a block diagram of the configuration of the embodiment.

The underwater bottom observation device A for dredging work of the present invention is a directional ultrasonic wave transmitting/receiving device attached to the bottom of a dredging vessel V via a tilt mechanism IA so as to be able to scan within a fan-shaped surface S including a vertically downward direction P below the water surface WL. a directivity angle detection device 2 that detects the directivity angle of the transducer L, and a plane position display device ( (hereinafter referred to as "PPI") 3, and the vertical downward component h (Dθ cos θ in the figure) of the direction distance information Dθ obtained from the directivity angle θ and the ultrasound transmission/reception time difference,
An arithmetic circuit 4 that performs an operation to subtract this from a fixed set value Do (that is, Do Dθcowθ in the figure) for each ultrasonic transmission pulse, an integration circuit 5 that integrates the results of this operation, and a display 6 that displays the integration results. It consists of

In the above embodiment, the ultrasonic transducer 1 is provided with an ultrasonic transmitting circuit 11, a receiving circuit 12, and a transmitting/receiving switching device 10, and still operates based on the transmission output of the ultrasonic transmitting circuit 11. A river wave generation circuit 31 and a directivity angle synchronization circuit 32 are provided in PPl3. These are similar to conventionally known sonar devices.

Further, in FIG. 2, 13 is a water bottom detection circuit, which clips the reflected wave with the highest level among the water bottom fault waves and cuts reverberation noise caused by multiple faults. 14 is a gate wave generation circuit, 15 is a counter, and this counter calculates the duration of the gate wave generated by the gate wave generation circuit 14 by the clock pulse circuit 16.
It is provided to measure and quantify based on the pulses.

Next, the operation of this invention will be explained.

In FIG. 2, when the tilt mechanism 1A scans the directional ultrasonic transducer l within a certain fan-shaped plane S,
The bottom line B is displayed on the PPI 3 based on these input information.

At the same time, transmission and reception information for each ultrasonic transmission pulse is input to the arithmetic circuit 4 via the seabed detection circuit 13, gate wave generation circuit 14, and counter 15, and information about the directivity angle θ from the directivity angle detection device 2 is also calculated. It is input to the phantom 1 circuit 4.

Regarding the undulating state of water bottom B, there is a height difference H between water bottom B1 after dredging and water bottom B2 before dredging, but the water depth after dredging is D.
The distance to the water bottom B2 for the directivity angle θ of o −i is D
When θ is assumed, it can be expressed as 1(=[1o−1)θωSθ (θ is the angle with respect to the vertical downward line P).

In the arithmetic circuit 4, the arithmetic operation regarding H is performed for each ultrasonic transmission pulse, and the result is input to the integration circuit 5.

In the integration circuit 5, the input values are integrated in sequence, and the integration results are displayed on the display 6 at the end of the scan.

The displayed value on this display 6 represents the area of the space between the set value DO and the water bottom line B2 located above it, so it is a value proportional to the amount of dredged soil. Therefore, this displayed value Based on this, it is possible to accurately predict the amount of soil immediately before the dredging that is currently in progress.

In the above embodiment, the angle θ is based on the vertical axis P passing through the ultrasonic transducer l, but the horizontal line Q
It goes without saying that it is also possible to use a method of detecting the angle θ using the angle θ as a reference. In this case, the height difference H is expressed as H=Do-117 sin θ.

In this way, the moving speed of the dredger and the operating speed of the dredging conveyor are determined and adjusted based on the displayed amount of soil scheduled to be dredged.

In the explanation of the above embodiment, the case where the water depth Do after dredging was used as the reference value was shown when calculating the residual discharge amount, but as shown in Fig. 3, there is an undulation B3 on the water bottom B, and the level
When ' is at an intermediate position, the reference value is set as .

It is also possible to input and set Dl instead of 1 and calculate the remaining output amount.

Furthermore, a travel needle 7 is provided in the integration circuit 5, and the amount of movement of the dredger V inputted from the travel needle 7 is multiplied by the earth volume height H in Fig. 2 at regular short intervals, and the sum is integrated. It can also be displayed.

In this case, the amount of soil removed from the bottom of the water after dredging can be known.

Generally, Doppler logs, Doppler sonar, etc. are used as Juki route classification9, but in the case of a dredger,
Since the movement is extremely slow, for example, a device is used that detects the amount of movement from the operating rotational speed of a winding winch used for fixing the dredger V to the ground, such as an anchor chain or a hawser.

As described above, this invention improves the condition of the water bottom to be dredged.
At the same time, the amount of dredged soil immediately before the dredging operation is calculated using I, so the moving speed of the dredger, work schedule, etc. can be controlled extremely easily and quickly using these displayed values. Even if you are not a professional or an expert,
This will make dredging work and planning easier.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an installation state of an embodiment of the present invention, FIG. 2 is a block diagram of the configuration of the embodiment, and FIG. 3 is an explanatory diagram showing another usage state. A... Underwater observation device for dredging work, 1... Directional ultrasonic transducer, 2... Directional detection device, 3... Planar position indicator (PPI), 4... Arithmetic circuit , 5... Integration circuit, 6... Display, P... Vertical downward line, S...
- Fan-shaped surface, θ...scanning angle.

Claims (1)

[Claims] (1) A directional ultrasonic transducer that scans in a fan-shaped plane including vertically downward under water; a directional angle detection device that detects the directional angle of the transducer; A planar position display device that displays the water bottom line based on the ultrasound transmission and reception time difference, and an operation that calculates the vertical downward component of directional distance information obtained from the directional angle and the ultrasound transmission and reception time difference, and subtracts this from a fixed set value. An underwater observation device for dredging work, comprising: an arithmetic circuit that performs operations for each ultrasonic transmission pulse; an integration circuit that integrates the results of this calculation; and a display that displays the results of the integration.