JPH0354739B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Technical Field] The present invention relates to a dredged soil quality determination method for determining the soil quality of underwater bed soil excavated by a dredger.

[Conventional technology]

This type of dredger is used to secure water depth for navigation routes, ports, etc. by scraping away the submerged soil such as riverbeds or seabeds, or to remove sludge, etc. This is becoming an important issue. The reason for this is that if you use a bucket or rudder with a cutter to scrape off the soil, for example, if you force it forward despite hitting a hard soil bed, the efficiency of the dredging work will be significantly reduced. There is a problem where dredging work has to be temporarily stopped due to damage.

For this reason, the soil quality of the soil has traditionally been determined, but the simplest method is to artificially determine the soil quality by hand or visual observation of the soil dug up by a ladder bucket. It is. However, this determination method relies heavily on human experience and intuition, which often results in incorrect determinations.

Therefore, in recent years, as a means to solve the problems caused by the above-described determination method, the armature current of the DC motor on the braking side of the swing is based on the field current value so that the output torque of the DC motor on the braking side of the swing is equal to the set torque. A method to control this has been developed.

[Problem that the invention seeks to solve]

However, this method of determining soil quality using torque detection means is directly affected by the difference between the swing speed of the dredger and the winding/feeding speed of the winch.
Soil quality cannot be determined accurately.

The present invention has been made in order to eliminate the above-mentioned problems, and provides a dredging system that more accurately determines the soil quality of the soil base without relying on human experience and intuition, and allows dredging work to be carried out smoothly. The purpose is to provide a soil quality determination method.

[Means for solving problems]

The present invention provides a dredger that excavates underwater soil using a bucket-equipped or cutter-equipped rudder, in which a soil quality detection means is provided at a predetermined location of the dredger, and a detection value detected by the soil quality detection means is set to a predetermined value. When the dredging condition is exceeded, it is determined that the soil bed is in the dredging state of hard soil bed or clay bed, and the display, alarm, bucket or cutter drive source is automatically stopped.

[Effect]

Therefore, by taking the above measures,
If the detection value detected by the soil quality detection means exceeds a predetermined set value, it can be determined that the soil is hard soil or clay soil by display, alarm, or deceleration or stop of the dredging operation. Soil quality can be easily determined without relying on it, appropriate treatment can be taken quickly, and dredging work can be carried out smoothly.

[Example] Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 4. First, in a bucket dredger with a bucket rudder, as shown in Figs. The rudder 2 is installed so that the tip of the rudder 2 is in contact with the bottom 3 of the water. 4 is a bucket drive source, and 5 is a rudder support. Although the ladder 2 is not shown, it is designed to be moved up and down by a ladder lifting device. Therefore, when the bucket drive source 4 is driven, the tumbler shaft 2b rotates, and the bucket shaft 2a accordingly rotates.
The bucket 2a at the lowest end of the rudder rotates and scrapes off earth and sand from the water bottom 3 for dredging.

In addition, in this dredger, chains or chains 6A1 to 6A3, 6 are anchored in three directions from the bow side A and the stern side B of the hull 1, respectively.
B1 to 6B3 are strung, and each chain, etc. 6A is strung on board the ship.
1 to 6A3 and 6B1 to 6B3 have separate winches 7
It is wound so that it can be wound up or unwound by... In these chains, 6A1 is designated as the bow left line, 6A2 is the head line, 6A3 is the bow right line, 6B1 is the stern left line, 6B2 is the stern line, and 6B3 is the stern right line. Therefore,
The bucket dredger has line 6A stretched in each direction.
1 to 6A3 and 6B1 to 6B3, and while feeding out the lines 6A1, 6B1 and 6A2, 6B2, the line 6A3,
By winding up 6B3, the swing motion 8 shown in FIG. 3 is performed, and the bucket 2a on the outside of the ladder 2 is...
While dredging the earth and sand on the water bottom 3, and further paying out the stun line 6B2 etc., the head line 6A2 is dredged.
etc., the forward movement 9 shown in FIG.
The dredger then dredged the earth and sand on the water bottom 3, and the dredger moved along the line shown in Figure 3 to clear section 10.
Earth and sand can be dredged during this period.

Therefore, in the present invention, the soil quality detection means 11 shown in FIG. After the signal is converted and amplified into an appropriate signal by 12, it is compared with a predetermined setting value in a comparison part 13. When the output of the signal conversion part 12 exceeds the setting value, the comparison part 13 determines whether the soil is hard soil or not. A determination signal indicating that it is a clay slab is sent out, and the determination result is displayed by the determination output section 14, or an alarm is generated or each winch 7, bucket drive source 4, etc. is stopped and suppressed.

By the way, as the soil quality detection means 11, a heel detector is installed at a predetermined location on the hull 1 to detect the heel in the swing direction during the swing motion 8, that is, the left and right inclination of the hull 1. When the detected value exceeds the set value, it is determined that the soil bed of the water bottom 3 is in a dredged state of hard soil bed or clay bed. Various types of heel detectors can be considered, such as one that detects the movement of a gyroscope with a potentiometer, one that optically detects the movement of air bubbles in a bubble tube, or one that detects the movement of bubbles in a level tube, or one that uses liquid placed on both sides of the dredger. There are detection means such as preparing level meters for each level meter and detecting the level difference between the two level meters.

Further, as another example of the soil quality detection means, a commonly used vibration detector is used. That is, when the bucket 2a collides with the hard soil or clay slab during dredging, the entire rudder 2 generates vibrations, which are detected by the vibration detector and when the detected vibration value exceeds the set value. This makes it possible to determine whether it is a hard soil slab or a clay slab.

Therefore, according to the configuration of the embodiment as described above,
The heel and vibration in the swing direction caused by the bucket 2a hitting the hard soil or clay are detected by a heel detector, vibration detector, etc., and when the detected value exceeds a predetermined value, the hard soil is detected. Since it determines whether the soil is a clay slab or clay slab, it has a relatively simple configuration and can automatically determine the soil condition without relying on human experience and intuition. Moreover, the determination results are accurate, making dredging work smoother. It can be done.

Although either a heel detector or a vibration detector is used as the soil quality detection means in the above embodiment, a combination of the two may be used to detect and determine the soil quality. Moreover, a ladder with a cutout may be used instead of a ladder with a bucket. In addition, the present invention can be implemented with various modifications without departing from the gist thereof.

〔Effect of the invention〕

As described in detail above, according to the present invention, it is possible to provide a method for determining the quality of dredged soil that can accurately determine soil quality with a simple configuration and at low cost without relying on human experience or intuition, and that can smoothly perform dredging work.

[Brief explanation of drawings]

Figures 1 to 4 are shown to explain one embodiment of the method of the present invention, in which Figure 1 is a schematic side view showing the state during dredging, Figure 2 is a plan view, and Figure 3 is a schematic side view showing the state during dredging. The figure shows the dredging route, and Figure 4 is a schematic block diagram for determining soil quality. 1...Hull, 2...Rudder, 2a...Bucket, 4...Bucket drive source, 6A1 to 6A3, 6
B1-6B3... Lines of chains, chains, etc., 7...
... Winch, 8 ... Swing operation, 9 ... Forward movement, 11 ... Soil quality detection means, 13 ... Comparison section, 1
4...Judgment output section.

Claims (1)

[Claims] 1. In a dredger that excavates underwater soil using a rudder, the output of a heel detector installed at a predetermined location of the dredger to detect the heel in the swing direction during swing operation and the vibration of the hull are detected. Provided with soil quality detection means for detecting soil quality from one or both of the outputs of the vibration detector to be detected, and when the detected value detected by the soil quality detection means exceeds a predetermined value,
A dredged soil quality determination method, comprising determining that the soil bed is in a dredged state of a hard soil bed or a clay bed.