JPH0785015B2 - Method for measuring sand thickness in sand removal boats - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a sand thickness measuring method for measuring the thickness of sand scattered on the seabed in a sand scattering boat.

[Prior Art] Conventionally, various sand thickness measuring methods of this type have been put into practical use. For example, there is a measuring method using a reinforcing bar.

In this measurement method, a reinforcing bar is manually inserted into the seabed from above the sand-spreading boat, and the difference in resistance between the scattered sand and the ground on the bottom of the sea is detected manually, and the thickness of the sand is measured by the reinforcing bar. It is measured by the feeding length of.

[Problems to be solved by the invention]

However, in the sand thickness measurement method, it is a manual measurement, and moreover, based on the change in the resistance value when the human feels,
In order to measure the sand thickness, there was a problem that the measured value differs depending on the person and continuous measurement is impossible.

Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a sand thickness measuring method in a sand spreader capable of automatically and continuously measuring the sand thickness. .

[Means for solving problems]

In order to achieve this object, the present invention, in the sand thickness measuring method in the sand spreader for measuring the thickness of the sand scattered on the sea floor from the sand spreader through the duct toward the sea floor, so as to be parallel to the duct A first towing stay provided on the front side of the duct in the traveling direction of the sand spreader, and a first towing stay provided on the rear side of the duct in the traveling direction of the sand spreader so as to be parallel to the duct. 2 towed stays and a rope suspended from the lower end of the first towed stay,
A first sled that is towed on the seabed just before the sand is sprayed by the duct, and a rope that is hung from the lower end of the second towing stay, and is on the sand immediately after being sprayed on the seabed by the duct. A towed second sled, a first water depth gauge equipped on the first sled and outputting a water depth signal according to the water pressure at the towing depth, and a second water sled provided on the second sled, the towing depth. A second depth gauge that outputs a depth signal according to the water pressure of
A detection circuit for detecting a difference in water depth based on the water depth signals output from the first and second water depth gauges as a thickness of the scattered sand.

[Action]

In the present invention having such a configuration, when the sand spreader moves forward while spreading the loaded sand on the seabed through the duct, the first sled is towed on the seabed just before the sand is sprayed by the duct,
The second sled is towed on the sand immediately after being sprayed to the seabed by a duct.

Then, when the first and second depth gauges and the second depth gauge mounted on the first sled and the second sled output the husband and wife depth signals to the detection circuit, the detection circuit detects the first and second sleds. Then, the difference in water depth based on the water depth signal output from the second water depth gauge is detected as the thickness of the scattered sand.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view showing a sand thickness measuring method in a sand spreader according to an embodiment, and FIG. 2 is a perspective view showing a main part of a sand thickness measuring device used directly for carrying out the sand thickness measuring method.

In FIG. 1 and FIG. 2, 1 is a sand spreader that moves forward while spraying sand 3 on the seabed 2, and 4 is loaded sand loaded on the sand spreader 1, for spreading the loaded sand 4. At the front part of the sand spreader 1, a duct 5 is provided vertically arranged so that its lower end faces the seabed 2.

Reference numeral 6 denotes a sand thickness measuring device equipped with the duct 5 on the sand scattering boat 1. The sand thickness measuring device 6 is a water depth gauge (first depth gauge).
7 and a depth gauge (second depth gauge) 8 are provided, and these two depth gauges 7 and 8 both have a built-in water pressure sensor that detects the water pressure at the towing depth, and each water pressure sensor responds to the detected water pressure. It is designed to output a water depth signal.

Reference numeral 9 is a towing stay (first towing stay), which is provided in front of the duct 5 in the traveling direction of the sand blasting boat 1 so as to be parallel to the duct 5, and a rope 10 is provided at the lower end of the towing stay 9. The depth gauge 7 is equipped on the sled (first sled) 11 connected by the so that the sled 11 can be smoothly towed on the seabed 2 immediately before the sand 3 is sprayed by the duct 5. Has become.

Reference numeral 12 denotes a towing stay (second towing stay), which is provided on the rear side of the duct 5 in the traveling direction of the sand spreader 1 so as to be parallel to the duct 5, and a rope is provided at the lower end of the towing stay 12. The depth gauge 8 is equipped on a sled (second sled) 14 connected by 13, whereby the sled 14 is smoothly towed on the sand 3 immediately after being sprayed on the seabed 2 by the duct 5. It is like this.

Reference numerals 15 and 16 are signal cables.

FIG. 3 is a block diagram showing a control system of the sand thickness measuring device.

As shown in the figure, the water depth systems 7 and 8 on the front and rear sides are both connected to the water depth difference detection circuit 17, and this connection is made via the signal cables 15 and 16.

This water depth difference detection circuit 17 is a circuit that detects the water depth difference from the difference between the water depth signals from the front and rear water depth gauges 7 and 8 and outputs the detected water depth difference to the display device as the thickness d of the dispersed sand 3. is there.

Next, a sand thickness measuring method which is the gist of the present invention will be described.

When the sand spreader 1 moves forward while spraying the loaded sand 4 on the seabed 2 through the duct 5, the sled 11 equipped with the depth gauge 7 sprays the sand 3 by the duct 5 through the rope 10 by the towing stay 9. The sled 14, which was towed just before the seabed 2 and equipped with a depth gauge 8, was connected to the duct 5 via the rope 13 by the towing stay 12.
It will be towed on the sand 3 immediately after being sprayed on the seabed 2.

The difference between the water depth of the front water depth gauge 7 and the water depth of the rear water depth gauge 8 corresponds to the thickness d of the sprayed sand 3.

Therefore, as shown in FIG. 3, when the water depth signals output from the depth gauges 7 and 8 on the front and rear sides are input to the water depth difference detection circuit 17, the water depth difference detection circuit 17 determines the water depth from the difference in the input water depth signals. The difference is detected, and the detected water depth difference is continuously output to the display device as the thickness d of the dispersed sand 3.

Thereby, the thickness d of the scattered sand 3 can be measured automatically and continuously.

〔The invention's effect〕

As described above, according to the present invention, the first towing stay provided on the front side of the duct in the traveling direction of the sand spreader so as to be parallel to the duct, and the sand spreader so as to be parallel to the duct. A towed stay provided on the rear side of the duct in the traveling direction of the vehicle and a rope hung from the lower end of the first towed stay, and towed on the seabed just before the sand is sprayed by the duct. And a second sled that is connected to a rope suspended from the lower end of the second towing stay and is towed on the sand immediately after being sprayed to the seabed by the duct, and the first sled. A first depth gauge, which is equipped on the sled and outputs a water depth signal according to the water pressure at the towing depth, and a second depth gauge, which is equipped on the second sled and outputs a water depth signal according to the water pressure at the towing depth. Output from the depth gauge and the first and second depth gauges Since it is configured with a detection circuit that detects the difference in water depth due to the water depth signal as the thickness of the scattered sand, the effect that the thickness of the dispersed sand can be automatically and continuously measured Is obtained.

Further, since the first and second sleds are connected by the ropes hung from the lower ends of the first and second towing stays provided at the front and rear of the duct, the first sled is sprayed with sand by the duct. It is possible to reliably tow the seabed immediately before, and it is possible to reliably tow on the sand immediately after the second sled is sprayed to the seabed by the duct, so it is equipped on the first and second slings. The effect of being able to accurately detect the thickness of the scattered sand based on the water depth signals of the first and second water depth gauges obtained is also obtained. The effect that control becomes possible is obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing a sand thickness measuring method in a sand spreader according to an embodiment, FIG. 2 is a perspective view showing an essential portion of a sand thickness measuring device used directly for carrying out the sand thickness measuring method, and FIG. FIG. 3 is a block diagram showing a control system of the sand thickness measuring device. 1 ... sand-sprayer, 2 ... ground, 3 ... sand, 4 ... loading sand,
5 ... Duct, 6 ... Sand thickness measuring device, 7, 8 ... Water depth gauge, 1
1,14 …… sledge, 17 …… water depth difference detection circuit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-61-254812 (JP, A) JP-A-61-109408 (JP, A) Actually open 55-127210 (JP, U) Actual-open Sho-58- 119778 (JP, U)

Claims (1)

[Claims] 1. A sand thickness measuring method in a sand spreader for measuring the thickness of sand scattered on the seabed from a sand spreader through a duct directed to the seabed, wherein the sand spreader is arranged so as to be parallel to the duct. A first towing stay provided on the front side of the duct in the traveling direction of, and a second towing stay provided on the rear side of the duct in the traveling direction of the sandblaster so as to be parallel to the duct. A first sled that is connected to a rope suspended from the lower end of the first towing stay and is towed on the seabed just before the sand is sprayed by the duct; and a first sled suspended from the lower end of the second towing stay. A second sled that is connected to the rope and that is towed on the sand immediately before being sprayed to the seabed by the duct, and that is equipped on the first sled and that outputs a water depth signal according to the water pressure at the towing depth. Depth gauge 1 and the second sled A second depth gauge that is installed and outputs a depth signal according to the water pressure at the towing depth, and a difference in depth depending on the depth signals output from the first and second depth gauges. A sand thickness measuring method in a sand-spreading boat, which is characterized by including a detection circuit for detecting as.