JPH06346461A - Transferable surveying base - Google Patents

Abstract

PURPOSE:To stably install on a water bottom. CONSTITUTION:A hydraulic cylinder 1401 is equipped at each leg 14 extending downward from the four corners of a square base 11 positioned on the bottom 3 of the sea. A grounding piece 1403 is attached at the front end of piston rod thereof. The distance from the grounding piece 1403 to the bottom 3 of the sea is measured by a submarine sensor 16 buried in each grounding piece 1403 and, in accordance with the measured result, the piston rod of hydraulic cylinder 1401 is slid appropriately by the control of a control box 18. Each leg 14 is extended or contracted so that respective grounding pieces 1403 get in contact with the bottom 3 of the sea.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile survey table used for survey work in marine construction.

[0002]

2. Description of the Related Art When surveying in offshore construction,
A mobile survey platform is used. A mobile surveying platform is generally towed to a surveying point on the water by a tugboat or the like and then submerged in the water. Conventionally, a mobile surveying platform has a substantially rectangular base in plan view, a tower standing vertically on the base, and a working floor provided on the top of the tower, and the base is submerged and placed on the bottom of the water. In addition, the work floor is located above the water surface.

[0003]

However, in the above-mentioned conventional mobile survey platform, if the water bottom surface is undulated or the water bottom surface is extremely inclined, the base cannot be stably seated on the water bottom surface. However, there was a problem that the stability of the mobile surveying platform was impaired. Further, if the base is tilted due to the undulations or tilting of the water bottom, the work floor is tilted accordingly, which adversely affects the accuracy of surveying. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a mobile surveying platform that can be stably installed on the water bottom and that can improve the accuracy of surveying. is there.

[0004]

In order to achieve the above object, the present invention provides a base fixed on the bottom of the water, and a plurality of expandable and contractible legs extending downward from a plurality of positions of the base. And a plurality of driving means for driving the legs to extend and retract, and a plurality of measuring means for measuring the distance from the tip of each leg to the bottom of the water in a state where the base is settled in water to a predetermined depth. And controlling means for controlling the driving means based on the measurement results of the measuring means, and extending and contracting the leg bodies so that the tip ends of the leg bodies come into contact with the water bottom surface in the state. Is characterized by.

Further, according to the present invention, the leg body is configured to include a hydraulic cylinder, and the control means controls the operation of the hydraulic cylinder. Further, the present invention further comprises a tower body vertically installed on the base, a work floor provided on the top of the tower body, and a tilt detection sensor for detecting a tilt of the work floor. Based on the detection result of the sensor, the control means controls each driving means so that the work floor is held horizontally.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a mobile surveying table according to an embodiment of the present invention, and FIG. 2 is a plan view of a main part of the mobile surveying table shown in FIG. As shown in these figures, the mobile surveying platform 1 of this embodiment includes a base 11 that is set on an undulating sea bottom 3 (corresponding to a water bottom), and a tower 1 that is vertically erected on the base 11.
2, a work floor 13 provided on the top of the tower 12, and a base 1
Extendable leg 1 extending downward from the four corners 1
4, a driving unit 15 (corresponding to a driving unit) that expands and contracts each leg 14, a seabed sensor 16 (corresponding to a measuring unit) that measures the distance from the tip of each leg 14 to a target, and the work floor 1
3, a tilt detection sensor 17 for detecting the tilt, and a control box 18 for controlling the driving of the driving unit 15 based on the detection results of the seabed sensors 16 and the tilt detection sensor 17.
(Corresponding to control means).

The base 11 is constructed by assembling a steel material or the like into a substantially rectangular plane shape. The tower body 12 is constructed by assembling a steel material into a substantially rectangular parallelepiped, and is erected vertically from the central portion of the base 11. The tower body 12 has four corners of the base 11 and four corners of the tower body 12 in a substantially vertical direction. The column 1103 is reinforced by a column 1101 spanned between them. In the figure, 1103 indicates one end of the column 1101 coupled to the base 11, and 1105 indicates the other end of the column 1101 coupled to the tower 12. The work floor 13 is formed in a substantially rectangular shape in a plane and is arranged in parallel with the base 11. A handrail 1301 is erected on the periphery of the work floor 13,
1, a yellow light 1303 for display and a flag 1305 are provided.

As shown in FIG. 3, the leg 14 is composed of a hydraulic cylinder 1401, a grounding piece 1403 (corresponding to the tip of the leg), and a bellows 1405. Hydraulic cylinder 14
01 is a cylinder body 1407, as shown in FIG.
The piston rod 1411 incorporated in the cylinder body 1407 and the inside of the cylinder body 1407 provided at the base end of the piston rod 1411 are connected to the front oil chamber 141.
5 and a rear oil chamber 1417, and a piston 1419. The cylinder body 1407 includes a front oil chamber 141.
5 and the rear oil chamber 1417, which communicate with the pressure oil inlet / outlet 1 respectively.
421 and 1423 are provided. This hydraulic cylinder 1401 is, as shown in FIG.
It is attached to 103 along its longitudinal direction, and the piston rod 1411 slides along said longitudinal direction.

The grounding piece 1403 is made of elastic rubber or the like, and is attached to the tip 1427 of the piston rod 1411 via a ball joint 1425.
The bellows 1405 is the tip 1 of the cylinder body 1407.
It is provided between 409 and the grounding piece 1403, and covers the piston rod 1411 and the ball joint 1425.

The drive unit 15 is composed of a hydraulic circuit and is provided for each leg 14. As shown in FIG. 3, each drive unit 15 includes a working oil tank 1501, an oil cooler 1503 that cools pressure oil (not shown) in the working oil tank 1501,
The hydraulic oil pump 1505 that sends out the hydraulic oil from the working oil tank 1501, the main valve 1507 that opens and closes the flow path of the hydraulic oil sent by the hydraulic pump 1505, and the hydraulic oil flow path that has passed through the main valve 1507 are Doorway 14
21 and a pressure oil inlet / outlet port 1423 are provided with a control valve 1509. Further, each drive unit 15 switches from the main valve 1507 to the control valve 15 to switch the flow path of the pressure oil in the control valve 1509.
A control valve 1511 for controlling the hydraulic pressure of pilot oil supplied to the hydraulic pressure control valve 09, and a check valve 1513 for detecting the presence or absence of the flow of pressure oil from the control valve 1509 to the pressure oil inlet / outlet 1421 or the pressure oil inlet / outlet 1423. The working oil tank 1501 and the oil cooler 15
03 may be provided in common to each drive unit 15 one by one.

The seabed sensor 16 is composed of, for example, a distance measuring sensor such as an ultrasonic sensor, and the grounding piece 1403 of each leg 14 is provided.
It is buried inside. The tilt detection sensor 17 is composed of, for example, a gyro and is arranged on the lower surface 1301 of the work floor 13. The control box 18 is composed of, for example, a microcomputer, and controls the operation of the control valve 1511 of each drive unit 15 based on the measurement result of the seabed sensor 16 of each leg 14 and the detection result of the tilt detection sensor 17. The control box 18 may be provided in common for each leg 14 or may be provided for each leg 14.

Next, a case where the mobile surveying platform 1 of the present embodiment having the above-described structure is installed on the sea bottom 3 will be described. First, the mobile surveying platform 1 is towed to a surveying location on the water by, for example, a tugboat (not shown), and is submerged therein to sink the base 11 to a predetermined depth. At this time, the piston rod 141 of the hydraulic cylinder 1401
1 is slid to the most cylinder body 1407 side. If the base 11 is settled to a predetermined depth, the sea bottom sensor 16 of each leg 14 measures the distance from the grounding piece 1403 of each leg 14 to the sea bottom 3 according to an instruction from the tugboat, and the measurement is performed. Control box 1
Sampling at 8.

When the measurement result by the seabed sensor 16 of each leg 14 is sampled, the control box 18 determines each piston rod 1411 based on the distance from the grounding piece 1403 of each leg 14 to the sea bottom 3. Calculate the slide amount of the piston rod 1411
The control valve 1511 of the drive unit 15 of each leg body 14 is controlled so that is moved, and pressure oil is supplied from the drive unit 15 to the hydraulic cylinder 1401 of each leg body 14. As a result, the grounding piece 1403 of each leg 14 is grounded to the sea floor 3.

When the base 11 is stably placed on the sea floor 3, the tug boat gives instructions, etc.
The inclination of the work floor 13 is detected by the inclination detection sensor 17,
The detection result is sampled by the control box 18. When the detection result of the inclination detection sensor 17 is sampled, the control box 1 is based on this.
Reference numeral 8 denotes each piston rod 1 for dividing the inclination of the work floor 13 into four components extending from the center toward the four corners of the base 11 and canceling the inclination of the work floor 13 according to the components in each direction.
The sliding amount of 411 is calculated, and the control valve 1511 of the driving unit 15 of each leg 14 is controlled so that the piston rod 1411 is slid by that amount, and the driving unit 15 is driven.
Pressure oil is supplied to the hydraulic cylinder 1401 of each leg 14. As a result, the work floor 13 is held horizontally.

As described above, according to the mobile survey table 1 of this embodiment, the rectangular base 1 fixed on the sea bottom 3 is used.
A hydraulic cylinder 1401 is provided on each leg 14 extending downward from the four corners of No. 1, and the tip 1 of the cylinder body 1407 is provided.
The grounding piece 1403 is attached to the tip 1427 of the piston rod 1411 that slides on the 409 side.
The sea bottom sensor 16 embedded inside measures the distance from each grounding piece 1403 to the sea bottom 3 and, based on the measurement result, the piston rod 1411 is appropriately slid by the control of the control box 18, and each grounding piece 140 is moved.
Each leg 14 is expanded and contracted so that 3 is in contact with the sea bottom 3. Therefore, when installing the mobile survey platform 1 on the undulating sea bottom 3, the grounding piece 140 of each leg 14 is installed.
3 can be surely grounded to the sea floor 3, and the base 11 can be stably placed on the sea floor 3, and the mobile surveying platform 1
Can be installed with good stability.

Further, according to the mobile survey table 1 of this embodiment, the inclination of the work floor 13 is detected by the inclination detection sensor 17,
The piston rod 1411 is appropriately slid under the control of the control box 18 based on the detection result. Therefore, when installing the mobile survey platform 1 on the sea floor 3, the base 11 can be placed on the sea floor 3 so that the work floor 13 can be held horizontally, and the yellow light 1303 on the work floor 13 can be installed. It is possible to improve the accuracy of the survey when surveying the ground contact point of the mobile surveying platform 1 based on the flag 1305 or other target.

In this embodiment, the case where the base 11 is a square is described, but the shape of the base may be a triangle or a polygon of pentagon or more, and in that case, each corner of the base (each A leg having the same configuration as that of the leg 14 may be provided so as to extend downward from the corner), and the drive unit 15, the seabed sensor 16, and the control box 18 may be configured according to the number of legs.

Further, in the present embodiment, each leg 14 is provided with the hydraulic cylinder 1401 and the leg 14 is expanded and contracted by the sliding of the piston rod 1411 thereof. However, the leg 14 is screwed to the screw shaft. A female screw member and a leg body is formed by being coupled to the male screw member and facing the outer peripheral surface of the screw shaft, and by sliding the female screw member and the tubular body in the axial direction of the screw shaft by rotating the screw shaft in the circumferential direction. The legs may be expanded and contracted. In that case, the drive unit may be configured by a motor or the like instead of the drive unit 15 configured by the hydraulic circuit.

Further, in this embodiment, the inclination detection sensor 17 is provided on the lower surface 1301 of the work floor 13, but the inclination detection sensor 17 may be omitted. Then, in the present embodiment, the case where it is installed on the undulating sea bottom 3 has been described, but the mobile survey platform of the present invention can obtain the same effect even when installed on an inclined sea bottom. it can.

[0020]

As described above, according to the present invention, a base placed on the bottom of the water, a plurality of extendable legs extending downward from a plurality of locations of the base, and A plurality of driving means for driving the legs to extend and retract, a plurality of measuring means for respectively measuring the distance from the tip of each leg to the bottom of the water in a state where the base is settled in water to a predetermined depth, Controlling each of the driving means based on the measurement result of the measuring means, the control means for expanding and contracting each of the legs so that the tip of each of the legs is in contact with the water bottom in the state, Can be installed on the bottom of the water with good stability. Further, a tower body vertically installed on the base, a work floor provided at the top of the tower body, and a tilt detection sensor for detecting a tilt of the work floor are further provided, and a detection result of the tilt detection sensor Based on the above, if the control means controls each of the drive means so that the work floor is held horizontally, the accuracy of surveying can be improved.

[Brief description of drawings]

FIG. 1 is a side view of a mobile surveying table according to an embodiment of the present invention.

FIG. 2 is a plan view of a main part of the mobile survey table shown in FIG.

FIG. 3 is an explanatory diagram showing a schematic block diagram of a leg and a drive unit shown in FIG.

[Explanation of symbols]

 1 Mobile Survey Platform 11 Base 12 Tower 13 Work Floor 14 Leg 1401 Hydraulic Cylinder 1403 Grounding Piece (Leg Tip) 15 Drive Unit (Drive Means) 16 Seabed Sensor (Measurement Means) 17 Tilt Detection Sensor 18 Control Box (Control) Means) 3 Sea bottom (water bottom)

Claims (3)

[Claims] 1. A base fixed on the bottom surface of the water, a plurality of extendable and contractible legs extending downward from a plurality of locations of the base, and a plurality of drive means for extending and retracting each of the legs. , A plurality of measuring means for respectively measuring the distance from the tip of each leg to the bottom of the water in a state where the base is settled in water to a predetermined depth, and each drive based on the measurement result of each measuring means Control means for controlling the means and for expanding and contracting each leg so that the tip of each leg is in contact with the water bottom in the above state, and a movable surveying table. 2. The mobile survey table according to claim 1, wherein the leg includes a hydraulic cylinder, and the control means controls the operation of the hydraulic cylinder. 3. A tower body vertically standing on the base,
A work floor provided on the top of the tower body, and a tilt detection sensor for detecting the tilt of the work floor are further provided, and the control means controls the work floor to be held horizontally based on the detection result of the tilt detection sensor. 1. Each of the driving means is controlled so that
Alternatively, the mobile survey table described in 2.