JP2894555B1 - Caisson construction support system - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To easily confirm data of a caisson position, a tidal current, and the like by a work boat and a construction command headquarter when setting up a caisson in the ocean. SOLUTION: A GPS measurement station 10 is provided in a caisson 2, a GPS reference station 20 and a GPS accuracy monitoring station 30 for eliminating errors are installed on land side, and these are used as a caisson position measuring device. In addition, the FC ship 1 has an FC, such as a compass 51, an FC ship inclinometer 52, and a boom inclinometer 53.
A ship attitude measuring device is arranged. Further, the FC ship is provided with state measuring devices such as a wind direction and anemometer 61 and a flow direction and anemometer 62 for tidal current. These measuring devices are:
Data is output to personal computers connected to each other, and each personal computer is connected by a LAN. Also, a personal computer for monitoring data from each measuring device is connected to the LAN. The personal computer for monitoring is installed at least in the FC ship 1 and the construction command headquarters.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a caisson construction support system used when installing a caisson in a water area such as the ocean.

[0002]

2. Description of the Related Art Generally, when a caisson is installed at a specific location in the ocean, for example, after the caisson is towed to a predetermined position in the ocean while floating, the caisson is suspended by, for example, a floating crane (FC ship). The caisson is placed at the bottom by pouring water into the caisson and submerging the caisson.

At this time, in order to install the caisson at an accurate position, it is necessary to accurately measure the position of the caisson. For example, a reflecting prism is installed at the caisson and at a position over which the reflecting prism can be seen, In addition, a method has been adopted in which a total station is installed on land whose position is measured and known, and the position of the caisson is measured by the total station.

[0004] Position measuring devices using GPS have also become widespread, and the position of a caisson has been measured using GPS. However, data from a GPS satellite basically includes an error. Therefore, even if a GPS measurement device is independently attached to a caisson, the position of the caisson cannot be accurately measured. Therefore, usually, in order to accurately measure the position of a moving object using GPS,
A GPS mobile receiving device is provided on the object side where the position is to be actually measured, and a GPS fixed receiving device is provided at a land position where the position is already known to correct the error.

[0005]

By the way, for example,
In the case where a pier foundation caisson is installed in the ocean to establish a bridge connecting the island and land, the pier foundation caisson is basically installed in the narrow part of the strait to reduce the length of the bridge. However, in such waters,
The tides that occur when the tides rise and fall are strong and fast.

Therefore, when installing the pier foundation caisson, a time zone (tidal stop) where the tidal current becomes the weakest is selected and installed. For example, the master of the FC ship observes the state of the surrounding tidal current. After confirming that the tide has weakened, the work to install the pier foundation caisson has begun. Therefore, the above-described method has a problem that the construction command headquarters or the like that directs work on the land side cannot grasp the actual state of the tide.

[0007]

According to a first aspect of the present invention, there is provided a caisson construction support system in which a caisson is installed at a predetermined position in a water area such as the ocean using a work boat having a crane for suspending the caisson. A caisson construction support system that supports this when installing a caisson, a position measurement device that measures the position of the caisson, a work boat attitude measurement device that measures the orientation of the work boat, such as the direction and inclination, etc. A state measurement device that measures the surrounding conditions such as the tidal current in the water area to be connected, and a display that is connected to these position measurement device, work boat attitude measurement device, and state measurement device, and that can display data output from all these devices And an apparatus.

According to the above arrangement, the caisson position data measured by the position measuring device, the work boat posture data measured by the work boat posture measuring device, and the state of the water area measured by the state measuring device. Can be displayed on the display device for confirmation. Therefore, if these display devices are installed in, for example, the steering room of a work boat, the operation room of a crane, etc., the construction command headquarters, etc., the position of the caisson, the attitude of the ship, and the state of the water area at each location are grasped. It is possible to perform the work.

In particular, the construction command headquarters can also grasp the state of the water area such as the tidal current, and when the caisson is to be installed when the tide is weakened, not only the work boat but also the At the headquarters, it is also possible to determine the timing of caisson installation based on the tide. In other words, the situation can be grasped in the same way by the side performing the construction at the site and the side conducting the construction at a position away from the site, so that the construction can be performed smoothly. In addition, since the data of the position of the caisson, the data of the attitude of the ship, and the data of the state of the water area can be displayed on one display device, the above-mentioned data can be easily confirmed. It is possible to quickly make a determination based on the data without taking time to grasp.

As the position measuring device, for example, a position measuring device using a GPS or an optical position measuring device such as a total station can be used. Further, as the work boat attitude measuring device, for example, various compass meters (compass) for measuring the direction of the boat and various inclinometers for measuring the tilt of the boat can be used. In addition, as the state measuring device, there are an anemometer for measuring the wind direction at sea, various anemometers for measuring the wind speed at sea, various wave height meters for measuring the height of the waves, and a flow direction of the tidal current. A tidal current meter for measuring the tidal current and a tidal current meter for measuring the tidal flow velocity can be used.

Further, it is preferable that the display device is arranged at least on a work boat serving as a construction site and at a place where commanding construction on land. It is preferable that these data can be displayed on the display devices arranged at the respective arrangement positions so that the data from the position measuring device, the work boat attitude measuring device, and the state measuring device can be confirmed.

According to a second aspect of the present invention, in the position measuring device, the position measuring device measures the position of the caisson by a GPS method based on transmission data from a GPS satellite. GP that can be measured at several locations and moves with the caisson
An S measurement station and a GPS reference station and a GPS accuracy monitoring station fixedly provided on land and whose positions are known are provided. The GPS measurement station, the GPS reference station, and the GPS accuracy monitoring station respectively transmit signals from GPS satellites. A GPS reception processing means for receiving data and processing transmission data, wherein the GPS reference station is a GPS base station that basically generates position measurement using GPS based on its known position.
An error processing transmitting unit that generates and transmits data for correcting an error of the measuring station, wherein the GPS measuring station determines an error-corrected position based on the data transmitted from the GPS reference station. Means, the GPS
The accuracy monitoring station is a GPS satellite that can be received by the GPS measurement station when the radio wave from one or more of the GPS satellites is blocked by an obstacle such as a structure on the work boat in the GPS measurement device on the caisson. And an obstacle error calculating means for measuring a position based on data obtained only from the vehicle and obtaining an error from a position of a known GPS accuracy monitoring station.

According to the above configuration, the position of the caisson is measured by GPS. However, by providing two or more GPS measuring stations in the caisson, not only the position of the caisson but also the orientation and inclination of the caisson can be measured. Can be measured. Further, by correcting the error by the GPS reference station, the position of the caisson can be measured at a practical level.

Further, according to the GPS accuracy monitoring station, for example, when radio waves from some GPS satellites are interrupted by a structure such as a crane of a work boat or an obstacle such as a high cliff at a GPS measurement station, In the accuracy monitoring station,
The error due to the obstacle can be obtained by determining the position using only GPS satellites that can be received by the GPS measurement station and comparing the position with the known position of the GPS accuracy monitoring station.

In the GPS accuracy monitoring station, the GP
By correcting the basic GPS error determined by the S reference station, only the error due to the above-described obstacle can be determined. In addition, the GPS reference station and G
The PS accuracy monitoring station is preferably installed in a location with a good view so that radio waves from GPS satellites are not blocked by obstacles, but the GPS measurement station can be seen from the GPS reference station and the GPS accuracy monitoring station. You don't have to.

In a caisson construction support system according to a third aspect of the present invention, the condition measuring device includes a current meter for measuring the flow velocity of the tidal current, and the current meter can measure the flow velocity of the tidal current at each depth. It is characterized by having.

According to the above configuration, by measuring the tidal current by the state measuring device, not only the time when the tidal current becomes weak, but also the flow velocity of the tidal current at each depth can be measured by the current meter. When setting up a caisson,
The influence of the tidal current on the caisson installation position can be estimated in detail from the flow velocity at each depth. In addition, when the time of the tide changes depending on the depth, the most preferable start time of the caisson installation work can be determined in more detail.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A caisson construction support system according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic configuration of a caisson construction support system of this example. As shown in FIG. 1, in this example, a caisson construction support system is used when a caisson 2 is submerged and installed by an FC ship (working boat) 1 in a water area W which is an ocean. The caisson construction support system includes a position measurement device group, a work boat attitude measurement device group, and a state measurement device group.

The position measuring device group further includes a GPS position measuring device group and an optical position measuring device group. The GPS position measuring device group includes a GPS measuring station 10 installed in the caisson 2, a GPS reference station 20 and a GPS accuracy monitoring station 30 provided on land.

The GPS measuring stations 10 are installed at two different points on the caisson, and are connected to the GPS antennas 12 for receiving radio waves from the GPS satellites 11. Two GPS receivers 13 for processing data and a GPS reference station 2
While receiving a later-described correction signal transmitted from 0,
A correction signal receiving device (the antenna 14 of the correction signal receiving device) that outputs the correction signal to the two GPS receivers 13 and 13
Only) and a coordinate conversion personal computer 1 connected to the GPS receivers 13 and 13 for obtaining actual coordinate positions based on position signals output from the GPS receivers 13 and 13.
5 is provided. In addition, the GPS measurement station 10 has a GP
A receivable GPS transmitter (not shown) for transmitting a signal indicating a GPS satellite 11 capable of receiving data output from the S receivers 13 and 13 is provided.

The GPS reference station 20 is located at a place with good view (reference point) whose position on land is known, and receives a radio wave from the GPS satellites 11.
An S antenna 21; a GPS receiver 22 connected to the GPS antenna 21 for processing received data;
A correction signal transmitting device 23 connected to the PS receiver 22 and transmitting a correction signal obtained by the GPS receiver 22 is provided.

In this example, a well-known real-time kinematic GPS is used for correcting the position data obtained by the GPS measurement station 10 by the GPS reference station 20, and the GPS measurement station 10 transmits the data from the GPS reference station 20. G of the GPS reference station 20 based on the correction signal
The distance and the azimuth from the reference point where the PS antenna 21 is arranged are determined. In the coordinate transformation personal computer 15, the position of the known reference point and the GP
The positions of the two points of the caisson 2 are calculated based on the data of the azimuth and the distance from the reference point input from the S receivers 13 and 13. In the coordinate transformation personal computer 15, the orientation (spin angle) of the caisson 2 is determined from the positions of the two points of the caisson 2.

The GPS accuracy monitoring station 30 is arranged in a location with a good view where the position on the land is known, and is connected to a GPS antenna 31 for receiving radio waves from the GPS satellites 11. A GPS receiver 32 for processing the received data, and a correction signal transmitted from the GPS reference station 20.
A correction signal receiving device that outputs the correction signal to the S receiver 32 (only the antenna 33 of the correction signal receiving device is shown);
These GPS receivers 32 are connected to the GPS
And an error calculation personal computer 34 for calculating the coordinate position based on the position signal output from the GPS receiver 32, operating the GPS receiver 32, and calculating the error of the GPS measurement station.

The GPS accuracy monitoring station 30 has a GPS
A receivable GPS receiver (not shown) for receiving a signal indicating a receivable GPS satellite 11 transmitted from the receivable GPS transmitter of the measuring station 10 and outputting the signal to the error calculation personal computer 34 is provided. Then, the GPS receiver 32 of the GPS accuracy monitoring station 30 uses the signal from the GPS satellite 11 and the correction signal from the GPS reference station 20 to
The azimuth and distance from the reference point of the GPS reference station 20 are obtained.

At this time, the GPS accuracy monitoring station 30
Error calculation personal computer 34 of all G which can receive a radio wave
Receivable G of the GPS measurement station 10 among the PS satellites 11 ...
The GPS receiving station 32 is operated so as to obtain the position using only the signal transmitted from the GPS satellites 11 designated as the signal transmitted from the PS transmitting device. Since the GPS accuracy monitoring station 30 is basically arranged at a position with a good view, the radio wave from the GPS satellites 11 is hardly obstructed by an obstacle, and the GPS satellites 11 passing over the sky at that time are hardly obstructed. Can receive signals from almost all of the GPS satellites 11.

On the other hand, at the GPS measuring station 10 provided on the caisson 2, radio waves from GPS satellites 11
There is a high possibility that the signals are blocked by structures such as cranes, wires, and suspenders of Vessel C1, and depending on the position of FC Vessel 1, signals from GPS satellites 11 are blocked by cliffs or mountains on the land side. there is a possibility. Therefore, the GPS measurement station 1
0, even if the number of satellites for which the position can be measured can be secured, if there are no obstacles at that time, if the number of satellites that can receive a signal is compared with the number of satellites that can receive the signal, the position is measured with a small number of GPS satellites 11 Therefore, there is a high possibility that an error occurs in the position measurement.

Therefore, as described above, the GPS accuracy monitoring station 3
0 indicates that the GPS measurement station 10 can receive signals.
Measure the position using only PS satellites 11 ...
Since the position of the GPS accuracy monitoring station 30 is known,
By comparing the measured position with the known actual position, it is possible to obtain an error caused by an obstacle blocking radio waves from some of the GPS satellites 11.

In the GPS accuracy monitoring station 30,
As described above, since the position is measured based on the correction signal from the GPS reference station 20, the basic error included in the GPS has been removed. The error which is the main factor can be obtained. Further, the measurement position in the GPS measurement station 10 may be corrected using the error obtained as described above, but here, it is monitored whether or not the error exceeds a predetermined allowable range. It has become.

The optical position measuring device group of the position measuring device group is essentially unnecessary if there is a GPS position measuring device group. That is, the position measurement device group only needs to be provided with one of the optical position measurement device group and the GPS position measurement device group. In this example, the accuracy of the GPS position measurement device group is reduced. For confirmation, both the optical position measuring device group and the GPS position measuring device group are provided.

The optical position measuring device group includes reflecting prisms 41, 4 arranged at two different points of the caisson 2.
1, a plurality of automatic tracking total stations 42 installed at known positions, a position calculating personal computer 43 connected to the plurality of automatic tracking total stations 42 wirelessly or by wire, and the position calculating personal computer 43 And a wireless transmission / reception device 44 for transmitting the measured position of the caisson 2 to the FC ship 1.

The reflection prisms 41, 41 and the automatic tracking type total station 42 are well known.
The automatic tracking type total station 42 tracks the moving reflecting prisms 41, 41 and constantly calculates the distance to the reflecting prisms 41, 41, the altitude angle and the horizontal angle. The position calculating personal computer 43 obtains the positions of the two points of the caisson 2 based on the data output from the automatic tracking total station 42, and obtains the direction (spin angle) of the caisson 2 from the positions of the two points. It has become.

The work vessel attitude measuring device group includes an FC ship 1
Azimuth meter 51 for measuring the azimuth of the vehicle, FC ship inclinometer 52 for measuring the inclination angle of the FC ship 1, and boom inclinometers 53 and 53 for measuring the inclination angles of the crane booms 3 and 3 of the FC ship 1.
And caisson inclinometer 54 for measuring the inclination angle of caisson 2
And a stress gauge (not shown) for measuring the internal stress of caisson 2
And a strain gauge (not shown). The compass 51 is a well-known gyro compass.
2, 53, 54, stress gauges and strain gauges are well known, but the compass 51, inclinometers 52, 53, 54, stress gauges, and strain gauges can output measured data as signals. As well as being connected to a personal computer as described below.

The state measuring device group includes a wind direction and anemometer 61 provided on the FC ship 1 for measuring a wind direction and a wind speed,
An electromagnetic flow direction / velocity meter 62 provided on the ship C for measuring the current direction and flow velocity of the tidal current at a predetermined depth; an ultrasonic Doppler current meter 64 provided on a measurement ship 63 disposed upstream of the caisson 2; , A microwave wave height meter (not shown) for measuring the wave height provided in the FC ship 1. The above-mentioned wind direction / anemometer 61, electromagnetic flow direction / velocimeter 62, ultrasonic Doppler velocimeter 64 and microwave wave height meter are well-known, and each can output measurement data as a signal. , As described below. Further, the ultrasonic Doppler velocimeter 64 can measure the flow velocity of the tidal current at each depth. The ultrasonic Doppler current meter 64
Is installed on the measurement ship 63 on the upstream side of the caisson 2, but may be installed on the FC ship 1.

FIG. 2 is a block diagram schematically showing a LAN (local area network) configured in the caisson construction support system of this example. As shown in FIG. 2, a computer serving as a server 71 is arranged on the FC ship 1, and each computer on the FC ship 1 is connected to a computer on the caisson 2 by wire.
Position calculation personal computer 43 for on-land optical position measurement devices
And a monitoring personal computer 72 for monitoring provided at the construction command headquarters and the like.

On the caisson 2, a coordinate conversion personal computer 15 of the GPS position measuring device group and a caisson inclinometer 5
A caisson tilting personal computer 55 connected to the server 4 is arranged, and these are connected to the server 71 via a LAN. The stress gauge and the strain gauge are also connected to the computer and to the LAN.

The server 7 is mounted on the FC ship 1 as described above.
1 is arranged, and the electromagnetic current direction / velocimeter 6 for the tidal current
2, a personal computer 65 for a tide, a personal computer 66 for a wave connected to a microwave wave height meter, a personal computer (not shown) connected to a compass 51, a monitoring personal computer 67 for monitoring, And a personal computer 68 connected to the wind direction / anemometer 61 and the FC ship inclinometer 52 (FIG. 3). (Shown) 69 and a personal computer (shown in FIG. 3) 70 connected to the boom inclinometer 53 are arranged, and these are connected by LAN.

The ultrasonic Doppler velocimeter 64 disposed on the measuring vessel 63 may be connected to the LAN by radio. The data output from each measuring device is sequentially output to the server 71 by the LAN of the caisson construction support system, and the data input to the server 71 is transmitted to the monitoring personal computer 6 arranged at various places.
7, 72 can be confirmed.

The monitoring personal computers 67 and 72
Must be installed at least at the FC ship 1 and the construction command headquarters on the land side, and it is also preferable to arrange them at locations such as measurement points where operators are present. FIG.
It is a block diagram of LAN structure in the caisson construction support system of this example.

As shown in FIG. 3, in the caisson construction support system, the entire A-1 block on land and the FC
It is divided into four blocks: A-2 block of ship 1, A-3 block of caisson 2, and A-4 block on the roof of FC ship 1. In the A-1 block on land, a position calculation personal computer 43 connected to the above-described total station 42 and a monitoring personal computer 73 installed for an operator of the position measurement device on land are included.
It is connected to a wireless transmitting / receiving device 44 which is a wireless transmitting / receiving device for LAN via a hub for OBASET.

In the land A-1 block,
Monitoring PC 72 for Construction Command Headquarters is 10BA
It is connected via a SET hub to a wireless transmitting / receiving device 45 that is a LAN wireless transmitting / receiving device. Then, the wireless transmission / reception devices 44 and 45 for the LAN of the A-1 block are
Data can be transmitted to and received from the four blocks of wireless transmission / reception devices 46 for LAN.

The position calculating personal computer 43 and the monitoring personal computers 72 and 73 are connected to data transmitting / receiving wireless transmitting / receiving devices 81..., Respectively. In the worst case, data transmission / reception can be performed between the wireless transmitting / receiving apparatuses 81 and the wireless transmitting / receiving apparatuses 82 and 82 in the A-4 block.

In the A-2 block inside the FC ship 1, a personal computer 65 connected to the above-described electromagnetic current direction / velocity meter 62 for the tide and a personal computer (not shown) connected to the compass 51 A monitoring personal computer 67 for monitoring, a personal computer 68 for database creation, a personal computer 6 connected to a wind direction / anemometer 61 and an FC ship inclinometer 52
9 is connected to the 10BASET hub, and 10B
It is connected to a server 71 connected to the ASET hub.

A personal computer arranged on the crane side of the FC ship 1, that is, a personal computer 70 connected to the boom inclinometer 53 and a personal computer 66 for a wave connected to the microwave wave height meter are connected by 10BASE5. Connected
The 10BASE5 is connected to the server 71 by being connected to the 10BASESET hub. In the A-3 block of the caisson 2, the above-mentioned GPS coordinate conversion personal computer 15 and the personal computer 55 connected to the caisson inclinometers 53, 53 are connected to each other by 10BASE2, and these personal computers 15, 55 are connected to each other by 10BASE.
It is connected to 10BASE5 of A-2 block via E2 and the media exchange repeater.

Then, the personal computers 15, 55 of the caisson 2
Is further connected to the server 71 via a 10-BASET hub of the A-2 block. The A-4 block also includes a personal computer 74 to which data from the position detection personal computer 43 for the total station, which is wirelessly input, is input as described later,
A personal computer 75 for data transmission / reception connected to 82 and another personal computer 76 are connected by 10BASE2, and the personal computer 74, 75, 76 is connected to the wireless transmission / reception device 4 for LAN via a media conversion repeater.
5 are connected by 10BASE2.

Further, the personal computer 7 of the A-4 block is connected via the media conversion repeater according to the above 10BASE2.
4, 75, 76 and the wireless transmission / reception device 45 are connected to the 10-BASET hub of the A-2 block, thereby being connected to the server 71. Therefore, A-2 block, A-
Server 71 located in 3 blocks and A-4 block
And the wireless transmitting / receiving device 45 are connected to each other via Ethernet.
One block of personal computers is connected via a wireless LAN, and in some cases, is connected by individual wireless transmission / reception devices 81. The data input from each measuring device is sampled every second and is finally stored in the database creation personal computer 68.

According to the caisson construction support system having the above configuration, when the caisson 2 is installed, the position of the caisson 2, the inclination of the FC ship 1, the azimuth of the FC ship 1, the inclination of the boom 3, the inclination of the caisson 2, etc. Attitude data, wind direction,
Surrounding data such as wind speed, tidal flow direction, tidal flow velocity, and wave height are input to the server 71, and the input data can be displayed on the monitoring personal computers 67, 72, and 73.

Therefore, the monitoring personal computers 67 and 7
2 and 73 are installed on the FC ship serving as the construction site and the construction command headquarters that supervises the construction, so that the data on the position of the caisson 2 and the F
Since the data on the attitude of Vessel C and the surrounding data such as the tidal current can be checked at the same time, almost all of the data affecting the installation of the caisson 2 can be displayed on the display screens of the monitoring personal computers 67, 72 and 73. You can confirm it just by looking at. Thereby, workability can be significantly improved in installing the caisson 2.

For example, waiting for the tide, caisson 2
In such a case, it is necessary to dispose the caisson 2 at the installation position and submerge it in consideration of the timing when the tide is weakened, and to display the position of the caisson 2 on one display screen of the monitoring personal computers 68, 72, 73, By displaying the flow velocity of the tidal current, the caisson 2 can be easily installed in a water area where the tidal current is fast.

Further, by arranging the monitoring computers 68 and 72 on the FC ship 1 serving as the construction site and the construction command headquarters, the above data can be simultaneously confirmed at the construction site and the construction command headquarters. Therefore, the situation can be grasped in almost the same manner at the construction site and the construction command headquarters. Therefore, the state of grasping the situation does not significantly differ between the construction site and the construction command headquarters, and the construction can be performed smoothly.

When the position of the caisson 2 is measured using the GPS when the caisson 2 is installed using the FC ship 1, a measurement error occurs due to radio interference caused by the crane boom 3 or the like. Is obtained by the GPS accuracy monitoring station as described above, at least it can be determined whether or not the error is within an allowable range, and the measured position can be corrected using the obtained error.

As a result, the position of the caisson 2 can be reliably measured only by GPS without using an optical position measuring device using the total station 42 or the like.
Also, as the tide current meter, by using the ultrasonic Doppler velocimeter 64, it is possible to measure the speed of the tidal current at each depth, so when the flow velocity and the timing of the tide are different depending on the depth, The installation start time of the caisson 2 can be determined in consideration of the influence of each depth. Therefore, the caisson 2 can be installed at a more accurate and accurate position.

Further, by connecting personal computers to the respective measuring devices as described above and connecting these personal computers to the server 71 and the monitoring personal computers 68, 72, 73 by LAN, the following effects can be obtained. .
For example, it is possible to reduce restrictions on a manufacturer of a personal computer or the like or an OS to be used. In addition, the control program when each measuring device is used independently can be used with almost no change, and switching to single use can be easily performed. In addition, the degree of freedom of arrangement of each measuring device, a personal computer for data processing, a personal computer for monitoring, and the like can be increased. Also, wiring can be facilitated by using a hub.

[0053]

According to the caisson construction support system according to the first aspect of the present invention, caisson position data measured by the position measuring device and work ship attitude data measured by the work ship attitude measuring device. And the data of the state of the water area measured by the state measuring device can be displayed on the display device and confirmed. Therefore, these display devices, for example, the operation room of the work boat steering room, crane, etc.,
If it is installed at the construction command headquarters, etc., it will be possible to work at each location while grasping the caisson position, the attitude of the ship, and the state of the water area.

In particular, the construction command headquarters can also grasp the state of the water area such as the tidal current, and when the caisson is to be installed when the tide is weakened, not only the work boat but also the At the headquarters, it is also possible to determine the timing of caisson installation based on the tide. In addition, since the data of the position of the caisson, the data of the attitude of the ship, and the data of the state of the water area can be displayed on one display device, the above-mentioned data can be easily confirmed. It is possible to quickly make a determination based on the data without taking time to grasp. In addition, by disposing the display device as described above, the situation can be grasped in the same manner on the site where the construction is performed and on the side that directs the construction, so that the construction can be performed smoothly.

According to the position measuring device according to the second aspect of the present invention, the position of the caisson is measured by GPS, but the position of the caisson is provided by providing two or more GPS measuring stations in the caisson. In addition to this, it is possible to measure the orientation and inclination of the caisson. Further, by correcting the error by the GPS reference station, the position of the caisson can be measured at a practical level.

Further, according to the GPS accuracy monitoring station, for example, when radio waves from some GPS satellites are interrupted by a structure such as a crane of a work boat or an obstacle such as a high cliff at a GPS measurement station, In the accuracy monitoring station,
An error due to the obstacle can be obtained by determining a position using only GPS satellites that can be received by the GPS measurement station and comparing the position with a known position of the self.

According to the caisson construction support system according to the third aspect of the present invention, by measuring the tidal current by the state measuring device, even when the tide stop time varies depending on the depth, the tide stop timing can be accurately determined. It is possible to estimate the influence of the tidal current on the installation position of the caisson in more detail when installing the caisson.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a schematic configuration of a caisson construction support system according to an example of an embodiment of the present invention.

FIG. 2 is a block diagram showing a schematic configuration of the caisson construction support system of the above example.

FIG. 3 is a block diagram showing a LAN constructed in the caisson construction support system of the above example.

[Explanation of symbols]

Reference Signs List 1 FC ship (work boat) 2 Caisson 10 GPS measurement station (position measurement device) 11 GPS satellite 13 GPS receiver (GPS reception processing means, error correction means) 20 GPS reference station (position measurement device) 22 GPS receiver (GPS reception) Processing means, error processing transmission means) 23 correction signal transmission apparatus (error processing transmission means) 30 GPS accuracy monitoring station (position measurement apparatus) 32 GPS receiver (obstacle error calculation means) 34 error calculation personal computer (obstacle error calculation means) 41) Reflecting prism (Position measuring device) 42 Automatic tracking total station (Position measuring device) 51 Compass (Working ship attitude measuring device) 52 FC ship inclinometer (Working ship attitude measuring device) 53 Boom inclinometer (Working ship attitude measuring) 54) Caisson inclinometer (workboat attitude measurement device) 61 Wind direction and anemometer (state measurement device) 62 Electromagnetic flow Direction / velocimeter (condition measuring device) 64 Ultrasonic Doppler velocimeter (condition measuring device) 68 Monitoring personal computer (display device) 72 Monitoring personal computer (display device) 73 Monitoring personal computer (display device) 74 Personal computer (for data transmission / reception) 75 Personal computer (for data transmission / reception) 76 Personal computer (for other use) 81 Wireless transmission / reception device 82 Wireless transmission / reception device

──────────────────────────────────────────────────続 き Continuing on the front page (72) Osamu Okamoto, Inventor 2570-4 Shimotsuruma, Yamato-shi, Kanagawa Prefecture Nishimatsu Construction Co., Ltd. (58) Investigated field (Int.Cl. ⁶ , DB name) E02D 23/00 E02D 23/02

Claims (3)

(57) [Claims] 1. A caisson construction support system for supporting a caisson at a predetermined position in a body of water such as the ocean by using a work boat having a crane for suspending the caisson. A position measuring device for measuring the position, a work boat attitude measuring device for measuring the attitude such as the direction and inclination of the work boat, and a state measuring device for measuring a surrounding state such as a tidal current in a water area where the caisson is to be installed, A caisson construction support system, comprising: a display device connected to the position measuring device, the work boat attitude measuring device, and the state measuring device, and capable of displaying data output from all the devices. 2. The caisson according to claim 2, wherein the position measuring device measures the position of the caisson by a GPS method based on transmission data from a GPS satellite. And a GPS reference station and a GPS accuracy monitoring station which are fixedly provided on land and whose positions are known. The GPS measurement station, the GPS reference station and the GPS accuracy monitoring station are respectively GPS satellites. And a GPS reception processing means for receiving the transmission data from the GPS and processing the transmission data. The GPS reference station, based on the known position,
Error processing transmission means for generating and transmitting data for correcting an error of the GPS measurement station basically occurring in the position measurement using the GPS measurement station, wherein the GPS measurement station is based on the data transmitted from the GPS reference station. An error correction means for obtaining a position where the error has been corrected, wherein the GPS accuracy monitoring station is connected to the GPS measurement station on the caisson from one or more of the GPS satellites due to an obstacle such as a structure on the work boat. If the radio waves are blocked,
2. An obstacle error calculating means for measuring a position based on data only from a GPS satellite receivable by a GPS measuring station and obtaining an error from a position of a known GPS accuracy monitoring station. The caisson construction support system described. 3. The condition measuring device according to claim 1, further comprising a current meter for measuring a flow velocity of the tidal current, wherein the current meter is capable of measuring the flow velocity of the tidal current at each depth. The caisson construction support system described.