JPH0639787B2 - Management method of rubble throwing height using laser level - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a method for controlling the height of rubble stones using a laser level.

[Prior Art] For the rubble mound that is the basis of gravity type dolphins and the like, it is most important to secure the leveling accuracy of the input leveling surface in terms of quality control.

In order to secure the leveling accuracy, change in the height of the work boat due to tide level and cargo and ballast (maximum variation 4.3 m)
Corresponding to, it is important to extend and contract the movable chute to keep the absolute height of the leveling hopper constant.

However, in the case of using a conventional surveying instrument, there were problems in terms of speediness, accuracy, labor saving, etc. (Japanese Patent Laid-Open No. 54-705).
86, JP-A-56-6827, JP-A-60.
-105713).

Further, Japanese Examined Patent Publication No. 60-23732 discloses a seabed rubble leveling device using a laser beam. However, in such a known technique, since the vertical position is obtained by a plurality of shift sensors, there is a drawback that the error becomes large when the number of photosensors is small and the control becomes troublesome when the number of photosensors is large.

[Problem to be solved] Therefore, an object of the present invention is to provide a management method of a rubble throwing height using a laser level capable of accurately maintaining the height position of a rubble hopper with a relatively simple device. is there.

[Means for Solving the Problem] According to the method for controlling the height of rubble stones using the laser level according to the present invention, rubble stones are thrown from a work boat through a movable sheet provided with a leveling hopper to rubble stones on the seabed. When building a mound, install a laser level light emitter with a horizontally rotating power source at the base point on land, install a laser level receiver that receives the laser beam of the laser level light emitter on the work ship, and drive driven by a motor A shuttle is provided on the chain that is hung between the pulley and the idler pulley, and the shuttle in the laser level receiver on the work boat traces and receives the laser beam based on the rotating laser beam from the laser level light emitter, The amount of change in the position of the laser beam received by the shuttle in the vertical direction is output as an electrical signal. An electric signal is input to the computer to calculate and display the average value of the length of the chute that should be set for each predetermined time, and the length of the chute installed extends and retracts the movable chute. The amount is measured with a rotary encoder and output as an electric signal, and the electric signal is input to a computer and constantly monitored, and the hopper is leveled within a tolerance range with respect to the above-mentioned predetermined value of the chute length and the above-mentioned actual measurement value. The gravel throwing leveling operation is carried out while keeping the height of the pile constant.

[Explanation of action and effect] Therefore, the shuttle traces and receives the laser beam from the laser level light emitter provided on land, but since the shuttle is attached to the chain and moves up and down by the motor, the laser beam is always received at the center and always received. The motors can be easily controlled so that the upper and lower areas are compared and the center of the shuttle receives light.

Then, the change amount is calculated every predetermined time, for example, every minute,
Accurate positioning is possible because the length of the chute is controlled and the hopper is kept at a fixed position.

In addition, when implemented, the construction error was extremely small even if there were undulations in the waves.

[Embodiment] In FIG. 1, 1 is a work boat for throwing rubble stones, 2 is an upper chute hanging from the work boat 1 into the sea, 3 is a wire not shown in the drawing, and is fed to the upper chute 2 by unwinding. A movable chute (lower chute) that expands and contracts (moves up and down) 4 is a leveling hopper attached to the lower end of the movable chute 3, and throws rubble from the work boat 1 through the upper chute 2, the movable chute 3, and the leveling hopper 4. Then, rubble mound 5 is built. 6 is a laser level light emitter installed at the starting point on land, and 7 is a laser level receiver installed on the work boat 1.

In FIG. 1, the leveling chute length is l = H-h1-
h2 However, H: Mound construction standard height h1: Automatic measurement by laser level h2: Constant Fig. 2 shows an example of the configuration of the weighing system, 6 is a laser level light emitter, 7 is a laser level receiver, 16
Is battery, 17 is control box, 18 is A
C / DC converter, 19 is a collection controller, 20 is an interface, 21 is a computer, 22 is a display, and 23 is a printer printer.

In the above system, a conventionally known laser level receiver may be used, and an example thereof will be described with reference to FIGS. 3 to 5.

The laser level receiver 7 is provided with a shuttle (light receiving sensor), and the shuttle 8 has a case (1), a case (2), and a case (3) whose height changes as shown in FIG. The amount of change is continuously measured and the result is output as an electric signal and a numerical value. a and b show the amount of change.

Details of the shuttle are shown in FIGS. 4 and 5. There are four shuttles, front and back, and left and right. Therefore, it is possible to measure regardless of the position of the receiver with respect to the light source (4
It can be measured if it can receive light at one of the locations). In the drawing, a front shuttle 8a and a rear shuttle 8b are shown. The shuttles 8a and 8b move up and down within the measuring range (2.4 m) of the receiver to detect the laser light. When the shuttles 8a and 8b detect the laser light, the shuttle always compares the upper and lower areas in order to receive the laser light at the center. Compare and receive the laser light at the center of the shuttle.

A drive mechanism is shown in FIG. 5, a drive pulley 10 is driven by a motor 9, and a drive chain 12 is hung between the drive pulley 10 and an idle pulley 11. The drive chain 12 has a front shuttle mast 8a and A rear shuttle mast 8b is attached. A mechanical counter 13 is driven by the drive pulley 10 via the idle gear 14. Reference numeral 15 is a spring that supports the mechanism.

The function of the weighing system will be described with reference to FIGS. 1 and 2.

The unevenness accuracy of throwing in and leveling shall be within ± 50 cm. For this reason, the accuracy of the survey system including the laser survey instrument is planned to be within 5 cm. The height of the hull is measured at the laser level, and the length of the chute is measured from the reference point of the hull using the Rotary Encoder.

(1) A laser level having a horizontally rotating (up to 600 rpm) light emitting source is installed at the starting point on land. Based on the rotating laser beam, the shuttle in the receiver on the work boat tracks the laser beam and outputs the amount of change in the vertical direction as an electric signal. This is input to a computer and the length of the chute to be set is calculated and displayed, for example, every minute.

(2) The length of the installed chute is also measured by the rotary encoder to measure the amount of wire paying in and out of the movable chute and input to the computer for constant monitoring.

(3) With respect to the set value and the actual measured value of the shoot length displayed in (1) and (3) above, the gravel throwing leveling operation is performed while keeping the height of the leveling hopper constant within the tolerance range. To do.

The use results are as follows: (1) The shuttle has the function of accurately operating in the vertical direction even when the ship is slightly shaken due to swells. A computer automatically calculates the average value of the shuttle position and displays the shoot length control value continuously. By setting the chute length according to the display, the construction error on the leveling surface could be kept within +5 cm to -15 cm as shown in FIG.

(2) The actual usage of the maximum reachable distance of the laser surveying instrument was 900 m. In addition, stable measurement was possible with almost no influence of sea conditions and weather. In terms of accuracy, it is desirable to use within 300 m, which is the standard specification of the reach distance.

[Effects of the Invention] As described above, the present invention has the following excellent effects.

(i) Since the shuttle is attached to the chain driven by the motor, the followability is good, and it suffices to input the rotational position of the motor into the computer, and the control is easy.

(ii) Since the shuttle is provided and the laser beam is received at the center of the shuttle, the height position can be accurately detected.

(iii) Since computer processing is easy, reliability is improved and work accuracy is improved.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a mode of managing the leveling chute length,
FIG. 2 is a block diagram of the weighing system, FIG. 3 is an operation explanatory view of the shuttle of the laser level receiver, FIG. 4 is a front view of the shuttle, and FIG. 5 is a view showing a drive mechanism of the shuttle.
FIG. 6 is a diagram showing the distribution of the difference between the set height of each layer and the average construction height. 1 ... Workboat, 2 ... above chute, 3 ... movable chute, 4 ... leveling hopper, 5 ... rubbish mound, 6 ...
Laser level light emitter 7 ... Laser level receiver, 8 ... Shuttle

Front Page Continuation (72) Inventor Ryuji Kagoshima 3-12-10 Hakataekimae, Hakata-ku, Fukuoka City, Fukuoka Prefecture Kashima Construction Co., Ltd. Kyushu Branch (56) Reference JP-A-60-105713 (JP, A) JP Sho 60-23732 (JP, B2)

Claims (1)

[Claims] 1. When a rubble stone is thrown in from a work boat through a movable sheet equipped with a leveling hopper and a rubble mound is built on the seabed, a laser level light emitting body having a horizontally rotating power source is installed at a base point on land. Then, a laser level receiver for receiving the laser beam of the laser level light emitter is installed on the work ship, and a shuttle is provided on a chain that is suspended between a drive pulley and an idler pulley driven by a motor. Based on the rotating laser beam from, the shuttle in the laser level receiver on the work boat tracks and receives the laser beam,
The amount of change in the vertical direction of the position of the laser beam received by the shuttle is output as an electric signal, and the electric signal is input to a computer to calculate and display the average value of the length of the chute to be set for each predetermined time. In addition, the length of the installed chute is retracted by a wire that expands and contracts the movable chute, the amount of payout is measured by a rotary encoder and output as an electric signal, and the electric signal is input to a computer to constantly monitor the chute. With respect to the above-mentioned predetermined value and the above-mentioned actual value of the length, gravel loading using a laser level characterized by performing a leveling operation while keeping the height of the leveling hopper constant within a tolerance range. How to manage height.