JPH0440497B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for determining whether dredging is necessary for a cutter suction dredger.

Dredging work by a cutter suction dredger is not automated, and the dredging surface is finished during the final swing, and after that, it is necessary to check whether the dredged surface is completely finished or not and whether dredging is necessary again. It relied on the intuition of its staff. In addition,
The reason why dredging is necessary is that when dredging with a cutter dredger approaches the final swing, the excavated trench gets deeper and the walls of earth and sand in the unexcavated areas on the front and sides become higher, which often causes them to collapse and cause the excavated areas to collapse. may be buried. If this is left as it is, there will be some unexcavated material, and it will be necessary to dredge again to the same depth. This is dredging.

Therefore, during dredging, the operator memorizes in his/her mind the relationship between the mud content percentage in the dredging pipe of the dredger and the swing speed, and compares the relationship between the mud content percentage and the swing speed during the final swing to determine the dredging surface. He was able to judge intuitively whether or not there had been a collapse from the front.

However, these manual operations have the following drawbacks.

○A Requires operator skill.

B. Even experienced operators are very intuitive, so they take the safe side and dredge again even though dredging is not necessary, reducing dredging efficiency.

Therefore, in order to improve the efficiency of dredging work by dredgers, a monitoring device is required to improve the efficiency of dredging work. , it became necessary to carry out wide-ranging monitoring, and since determining whether or not dredging was necessary during dredging work greatly affected dredging efficiency, a dredging necessity determination device became necessary.

Therefore, the object of the present invention is to provide a device for determining whether dredging is necessary for a cutter suction dredger that meets this need.

Therefore, the dredging work is analyzed as follows.

Generally, dredging work is carried out by controlling the swing speed, etc., in order to keep the mud content within a certain range as much as possible. That is, if the mud content is low, the amount of soil lifted will be reduced and work efficiency will be poor, and if it is high, problems such as sediment retention in the dredging pipe will occur.

If the dredged soil is hard, the swing speed will be slow and the mud content will be low.

Conversely, if the ball is soft, the swing speed will be faster, but the mud content will remain within a certain range.

Furthermore, when the soil collapses, the amount of soil per unit length in the swing direction increases, but the mud content is controlled to be kept within a certain range, so the swing speed slows down.

Due to the above conditions, it is not possible to judge whether or not the earth and sand have collapsed based only on the swing speed.
Furthermore, since the mud content is controlled to be kept within a certain range as described above, it is not possible to judge whether or not soil has collapsed based only on changes in the mud content. Therefore, if the soil collapses,
We focused on the fact that compared to other locations, the height of soil per the same length of dredging in the swing direction is higher, that is, the amount of soil to be dredged (amount of soil lifted) is larger. It has been found that by comparing the amount with the calculated (theoretical) amount of soil to be lifted in the case where there is no soil collapse, it is possible to judge whether or not there has been soil collapse, that is, whether or not dredging is necessary.

The earth and sand excavated by the cutter is mixed with water, sucked in by the dredging pump, and discharged through the dredging pipe. Therefore, instead of comparing each volume of soil lifted from the relationship of flow rate in dredging pipe = amount of earth and sand (amount of earth lifted) + amount of water, mud content = amount of earth and sand (amount of soil lifted) / flow rate in dredging pipe, The need for further dredging can also be determined by comparing the actual mud content, which is the value obtained by dividing the amount of soil lifted by the flow rate in the dredging pipe, with the calculated (theoretical) mud content. The calculated (theoretical) mud content can be determined as follows.

Calculated (theoretical) soil lift amount CA = depth of soil to be dredged (dredging advance amount A) x height (excavated soil thickness T) x dredging length in swing direction (swing speed
Vt) Calculated (theoretical) mud content C = Calculated (theoretical) soil lift amount CA / Dredging pipe flow rate Vdt In addition, the actual mud content can be obtained from the output Vst of the mud content meter. I can do it.

Embodiments of the present invention will be described in detail below with reference to the drawings.

In Figures 1 and 2, 1 is a cutter head provided at the tip of the rudder, 2 is a swing wire, 3 is a swing winch connected to the swing wire 2, 4 is a spud, 5 is an anchor, and 6 is a cutter head provided on the dredging pipe 8. A flow meter measures the flow rate Vdt, 7 is a mud content meter that measures the actual mud content Vst, and 9 is a dredging pump, which represents a general katsuta suction dredger. Note that A indicates the dredging advance amount, and T indicates the excavated soil thickness (final swing soil thickness).

A swing speed meter for measuring the swing speed Vt of the cutter head 1 is also placed at an appropriate location (not shown).

As shown in FIG. 3, this device is comprised of a manual input function section 10, a sensor section 11, a dredging necessity determination section 12, and a display section 13.

The basic specifications of this device are as shown in Figures 1 and 2. When the cutter suction dredger makes its final swing, it is necessary to calculate the theoretical amount of dredged soil to be lifted during the final swing.

For this purpose, the Katsuta dredger reads the excavated soil thickness T and the dredging advance amount A of the final swing in one spud of the Katsuta suction dredger from the dredging plan diagram that is normally prepared at the dredging site.

This dredging advance amount A (i.e. depth) and the excavated soil thickness T
(i.e. height) and the swing speed Vt (i.e. dredging length per unit time) when the dredger actually makes its final swing, the theoretical amount of soil to be dredged per unit time is Calculate the quantity CA.

Next, by dividing this theoretical lifting amount CA by the flow rate Vdt (per unit time) in the dredging pipe 8, the theoretical mud content C, which is the calculated (theoretical) mud content, is obtained.

The actual mud content rate Vst is obtained from the mud content meter 7 mounted on the dredging vessel, and by comparing this theoretical mud content rate C with the actual mud content rate Vst, the situation of the seabed can be determined.
It will also be possible to determine whether dredging is necessary.

As shown in FIG. 3, this device allows a computer to process the above matters. The excavated soil thickness T and dredging advance amount A from the manual input function section 10 and the swing speed Vt from the swing speed meter of the sensor section 11 are calculated, and the theoretical amount of soil to be lifted every moment is determined by the multiplier section in the dredging necessity judgment section 12.
CA=T×A×Vt is obtained.

Next, the theoretical mud content ratio C=CA/Vdt is obtained from the dividing section using the theoretical soil lifting amount CA obtained above and the dredging pipe internal flow rate Vdt from the flow meter 6 of the sensor section 11. The theoretically measured mud content ratio α=Vst/C, which is the ratio between this theoretical mud content C and the dredging pipe mud content Vst from the mud content meter 7 of the sensor unit 11, is obtained from the dividing unit. By displaying the theoretically measured mud content ratio α on the display unit 13 at each sampling time, it becomes possible to determine whether or not dredging is necessary.

In addition, to summarize the above calculations, as a result, the theoretically measured mud content ratio α is determined by the excavated soil thickness T and the dredging advance amount A.
This is the ratio of the product of the swing speed Vt and the product of the flow rate Vdt in the dredging pipe 8 and the actual mud content Vst.

The setting of the judgment cursor for displaying the reference value on the display section 13 is such that the setting value can be freely selected. The reference value for judgment is determined by trial digging in the dredged area. For example, if the standard value is determined to be 0.5 based on the soil quality of the area to be dredged, the judgment cursor will be set to 0.5.
If the theoretically measured mud content ratio α value is 0.5 or more, dredging is unnecessary, and if the α value is 0.5 or less, dredging is required.

Further, the theoretically measured mud content ratio α and the reference value displayed on the display unit 13 may be the reciprocals of the above values.

As described above, according to this embodiment, the input data from the sensor section 11 using the conventional swing speed meter, flow meter 6, and mud content meter 7, the excavated soil thickness T from the manual input function section 10, The dredging necessity determination unit 12 performs multiplication and division with the data of the dredging advance amount A, displays the theoretically measured mud content ratio α and the reference value on the display unit 13, and determines the necessity of dredging. It is possible to automatically monitor the operation that the operator has judged intuitively.

In short, according to the present invention, the manual input function part 10 inputs the excavated soil thickness T and the amount of dredging advance A, the sensor part 11 having the swing speed meter, the flow meter 6, and the mud content meter 7; Signals T and A from the input function section 10 and the sensor section 11
Calculate the theoretically measured mud content ratio α, which is the ratio of the product of the signal Vt from the swing speed meter, the product of the signal Vdt from the sensor unit 11 flow meter 6, and the signal Vst from the mud content meter 7. Equipped with a dredging necessity determination unit 12 and a display unit 13 that displays the theoretically measured mud content ratio α and the reference value, the dredging plan in the final swing and the theoretical calculation using conventional dredging sensors are provided. By calculating the actually measured mud content ratio and displaying the theoretically measured mud content ratio and the reference value on the display, it is possible to determine whether or not further dredging is necessary. Monitoring is performed automatically. Furthermore, until now, the necessity of dredging has been determined based on the operator's sense (memory), but with the present invention, the determination is based on predetermined set values, which has the advantage of increasing the efficiency of dredging work. be.

[Brief explanation of drawings]

FIG. 1 is a plan view of a cutter suction dredger, FIG. 2 is a side view thereof, and FIG. 3 is a circuit diagram showing an embodiment of the present invention. 1... Cut head, 2... Swing wire,
3... Swing winch, 6... Flow meter, 7...
Mud content meter, 10...Manual input function section,
DESCRIPTION OF SYMBOLS 11... Sensor part, 12... Dredging necessity determination part, 13... Display part.

Claims (1)

[Claims] 1 A manual input function section that inputs the excavated soil thickness and dredging advance amount, a sensor section that has a swing speed meter, a flow meter, and a mud content meter, and a signal from the manual input function section and the swing of the sensor section. a dredging necessity determination unit that calculates a theoretically measured mud content ratio, which is the ratio of the product of the signal from the speedometer, the signal from the flowmeter in the sensor unit, and the signal from the mud content meter; , and a display section for displaying a theoretically measured mud content ratio and a reference value.