JP2001201346A - Surveying method and surveying device for object suspended in water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surveying method and a surveying device requiring no installation of a surveying tower for an object in surveying the object suspended in water from a sinking work barge. SOLUTION: At least three points located not on a straight line are set on the sinking work barge 16 and the object 14 respectively to survey the object 14 suspended in water via a plurality of slings from the sinking work barge 16. At least six distances including the distances between the points on the sinking work barge 16 and one of the three points on the object 14 and the distances between the points on the object 14 and one of the three points on the sinking work barge 16 are concurrently measured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for surveying an object suspended underwater by a submerged work boat.
In particular, the present invention relates to a method and an apparatus for measuring a newly installed submerged box connected to an existing submerged box previously installed on the water floor for construction of a submerged tunnel.

[0002]

2. Description of the Related Art Conventionally, in order to measure a new submerged box suspended underwater through a plurality of suspension cables on a submerged work boat for installation on the water bottom, a height higher than the installation depth is set in the new submerged box. In addition, a water surveying tower was installed, and a water level gauge (communication pipe) or an inclinometer was installed in the newly installed sedimentation box.

[0003] According to this, light surveying of the survey tower and GPS (Global Posit
ioning System), and the position and orientation of the newly buried box can be known from the indicated values of the water level meter and the inclinometer. It is used to guide the new submerged box to a position that matches.

[0004] However, this has a problem that it takes time and labor to remove the surveying tower after the new submerged box is installed on the water floor. This problem is particularly noticeable when the installation depth of the newly buried box is deep, which requires a higher survey tower. In addition, there is a problem that the survey tower vibrates in a water area where the tide is strong, and the survey accuracy is reduced. Furthermore, since the removal of the surveying tower requires diving work by a diver, there is a problem that the removal of the surveying tower becomes more difficult when the depth of installation of the newly buried box is deep.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to measure a surveying object such as a newly buried box suspended underwater by a submersible work vessel without requiring the installation of a survey tower on the object. It is to provide a method and a surveying device.

[0006]

SUMMARY OF THE INVENTION A surveying method according to the present invention is directed to a new submerged box suspended in water through a plurality of suspension cables connected to an existing submerged box installed on the water floor. A method of surveying an object, such as: setting at least three non-linear points on the sinking work boat and setting at least three non-linear points on the object; Of the distance between each point on the work boat and each point on the object, the distance between each point on the submerged work boat and any of the at least three points on the object; Measuring simultaneously at least six distances, including a distance between each point and any of the at least three points on the sinking workboat.

The measurement of the at least six distances is performed by measuring a propagation time of a sound wave between the points,
Further, the at least six distances can be calculated by multiplying the sound wave propagation time by a sound speed obtained in consideration of a sound speed near the water surface of the sound wave and a sound speed at a depth position of the object.

The sound velocity near the water surface is calculated by dividing a known distance between points on the submerged work ship by the sound wave propagation time between the points, and the sound velocity at the depth position of the object is calculated as It can be calculated by dividing the known distance between the upper points by the sound propagation time between the points.

The surveying device according to the present invention is provided at one of at least three points on the submerged work vessel and at least three points on an object such as the newly buried box, and at the other. A sound wave receiver, and a measuring device for measuring a sound wave propagation time between the sound wave transmitter and the sound wave receiver, which is connected to the sound wave transmitter and the sound wave receiver by electric wires, respectively.

[0010] The newly buried box is hung from the hanging cable via a jig, the sound wave transmitter or the sound wave receiver is arranged on the jig, and the jig is remotely installed by the jig. It can be detachable from the immersion box.

Instead of installing the sound wave transmitter and the sound wave receiver at one or the other of the at least three points on the submerged work boat and the at least three points on the object, respectively, Transceivers and transponders can be installed. A measuring instrument for measuring a sound wave propagation time between the sound wave transceiver and the transponder is connected to the sound wave transceiver by an electric wire.

Similarly, the object is hung on the hanging cable via a jig, the sound wave transceiver or the transponder is disposed on the jig, and the jig is remotely operated from the object. It can be detachable.

[0013] The surveying device may include an inertial navigation device installed on the object.

[0014] In this case, similarly, the object is hung on the hanging cable via a jig, the inertial navigation device is arranged on the hanging jig, and the jig is remotely operated by the jig. It can be detachable from the object.

In the case where the object is a new submerged box connected to an existing submerged box installed on the bottom of the water, any of the surveying devices may further include a connection end of the existing submerged box and a new submerged box. It may include a television camera arranged at any one of the connection ends and three light sources arranged at the other.

[0016]

According to the present invention, according to the present invention, each point on the submerged work boat and an object suspended in the water by the submerged work boat, for example, a new submerged vessel connected to an existing submerged box installed on the water bottom. Among the plurality of distances between the points on the box, the distance between each point on the sinking work vessel and any of the at least three points on the newly buried box, By simultaneously measuring at least six distances including a distance between at least three points on the ship, a relative position (relative coordinates) of the newly buried box with respect to the sunk work vessel at a temporary point (measurement time) is obtained. The surge, sway, and heave (relative displacement in two directions perpendicular to each other on the horizontal plane and vertical displacement) Relative displacement), roll, pitch and yaw (inclination with respect to a horizontal plane and a rotation angle around a vertical axis of the new submerged box) indicating the attitude of the new submerged box, and the geographical position of the new submerged box. This does not require the installation of a survey tower on the new submerged box for surveying the new submerged box, and also ensures that the new submerged box is accurately surveyed even in tidal waters. Can be.

The measurement of the at least six distances is performed by measuring the sound wave propagation time between the points, and the sound wave propagation time is used to determine the sound speed near the water surface of the sound wave and the sound speed at the depth position of the object. If the at least six distances are calculated by multiplying the sound speed (for example, the average value of both sound speeds) obtained in consideration of the above, the above-mentioned 6 due to a change in the sound speed accompanying a change in water temperature, salt concentration, and water depth (water pressure) is obtained. The measurement error of the two distances can be reduced.

The sound velocity near the water surface is obtained by dividing the known distance between points on the sinking work boat by the sound wave propagation time between the points, and the sound velocity at the depth position of the object is obtained by By dividing the known distance between the points by the sound wave propagation time between the points, each can be easily calculated.

The six distances between each point on the submerged work boat and each point on the object suspended therefrom are as follows:
The propagation time from transmission to reception of the sound wave by the sound wave transmitter and the sound wave receiver installed at these points can be known by measuring with a measuring device.

The six distances may be, for example, from the transmission of sound waves from each of the transceivers on at least three points on the sinking vessel, from the transponders on at least three points on the sinking vessel receiving the sound waves. By measuring the time until the transmitted sound wave is received by the measuring device, it can be similarly known.

In the case where the transponder is used, a wired connection between the transponder and the measuring instrument can be eliminated. For this reason, in the case of a wired connection, it is possible to eliminate the necessity of controlling the routing of electric wires that can withstand the tide.

In addition, the object is hung not directly on the hanging cable but indirectly via a jig, and the object is placed on the jig by, for example, 3 h.
By arranging the two sound wave receivers or transponders and further enabling the jig to be separated from the object by remote control, the sound wave receiving device installed on the jig together with the jig can be performed without diving work by a diver. Machine or transponder can be easily recovered.

Six factors indicating the state of the object in the water, namely, surge, sway and heave, and roll, pitch and yaw can be easily known from the output of the inertial navigation device installed on the object or the jig. it can.

[0024] When the object is a new buried box connected to an existing buried box installed on the bottom of the water, one of the connection end of the existing buried box and the connection end of the new buried box is previously provided with a television. If a camera is arranged, and three light sources are arranged on the other side, when the connection end of the newly buried box is close to the connection end of the existing buried box, the television camera shoots the three light sources, By monitoring the video,
Detecting the posture of the newly buried box with higher accuracy, further improving the consistency of the newly buried box with respect to the existing buried box,
More accurate interconnections can be realized.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a submerged box (existing submerged box) 12 is installed on a water floor 10 such as a seabed or a riverbed to construct a submerged tunnel. Further, a new submerged box (new submerged box) 14 towed into the construction area of the submerged tunnel for connection to the existing submerged box 12 is provided with a plurality of suspension cables 18 by the submerged work boat 16.
Is suspended underwater through.

The submersible work boat 16 is a rigid member (not shown).
And two catamaranes, barges (not shown), etc., connected to each other through a pair of pontoons 20. A pair of suspension cables 18 extend from each pontoon 20 into the water.

Further, both suspension cables 18 extending from each pontoon 20 are respectively connected to a pair of winches (not shown) installed on each pontoon 20, and the lifting and unwinding of the suspension cable 18 by operating each winch. Can change or control the water depth position and attitude of the new buried box 14, whereby the new buried box 14 can be operated such that its connection end is aligned with the connection end of the existing buried box 12. it can.

Each of the pontoons 20 is provided with a GPS antenna 22. Based on a radio wave from a satellite received by the GPS antenna 22, a current position (geographical position) of each pontoon 20 at the time of receiving the radio wave is provided. ) Can be known.

In addition, the above-mentioned operation of the newly installed submerged box 14 (boxing)
The geographical position and attitude of the new submerged box 14 which is necessary for the above is to set at least three points (A, B, C) which are not in a straight line on the submerged work boat 16 and to directly At least three points (A ', B',
After setting C ′), six distances including the following distances among the distances between each point on the submerged work boat 16 and each point on the newly laid submerged vessel 14, that is, on the submerged work boat 16 Each point (A,
B or C) and three points (A ', B',
C ′), each point (A ′, B ′ or C ′) on the newly buried box 14 and 3
It can be determined by measuring six distances simultaneously, including the distance to any of the points (A, B, C).

Therefore, the next 6 for the 6 distances
It can be specified by simultaneously measuring other combinations except one combination.

That is, ｛BA ', BB', BC ', CA', CB ', CC'
(When there is no distance about A)｝, ｛AA ', AB', AC ', C
A ', CB', CC '(when there is no distance about B)｝, ｛AA', A
B ', AC', BA ', BB', BC '(when there is no distance about C)｝,
｛AB ', BB', CB ', AC', BC ', CC' (if there is no distance for A ')｝, ｛AA', BA ', CA', AC ', BC', CC '(B'距離, and に 関 す る AA ', BA', CA ', AB', B
B ′, CB ′ (when there is no distance for C ′)｝. Here, the alphabetic characters in parentheses indicate the points, and a series of the alphabetic characters, for example, “AA ′” is between the point A on the sinking work boat 16 and the point A ′ on the newly buried box 14. Indicates the distance of

By simultaneously measuring the six distances, that is, the combination of the six distances other than the combination of the six excluded distances, three points (A, B, C) on the submersible work boat 16 are connected. The relative position of a triangle obtained by connecting three points (A ′, B ′, C ′) on the newly buried box 14 with respect to the obtained triangle can be determined.

That is, the distance between the obtained six distances, the coordinates of the three known points (A, B, C) on the submersible work vessel 16 and the three points on the newly known submerged box 14 is known. distance
(A'B ', B'C', and C'A '), the points (A', B) on the newly buried box 14 with respect to the coordinates of the three points (A, B, C) of the submersible work boat 16 ', C') can be calculated, and from these coordinates, two horizontal displacements (surge, sway) and vertical direction of the newly buried box 14 with respect to both pontoons 20 (submerged work boat 16) can be calculated. It is possible to know the displacement (heave) and the rotation angle (roll, pitch) around the horizontal axis that is orthogonal to each other and the rotation angle (yaw) around the vertical axis of the newly buried box 14.

To measure the distance, a surveying device 24 described below is used.

The surveying device 24 includes a plurality of sound wave transmitters 26.
And a plurality of sound wave receivers 28.

In the illustrated example, the current position and attitude of the newly installed submerged box 14 are specified with higher accuracy, and the submerged work boat 16 is used.
And four points are set for each of the new submerged boxes 14, and the three points can be selected from these four set points. Therefore, as the six distances, any six of a total of 16 distances between the four points can be selected. In addition, all 16 distances for all set points can be measured, thereby further improving accuracy.
The number of the set points for each of the submersion operation vessel 16 and the new submerged box 14 may be five or more.

In the illustrated example, the three points (A, B,
Four points including C) are arbitrarily set on the bottom of both pontoons 20, and four sound wave transmitters 26 are attached to these four points, respectively. Further, four points including the three points (A ′, B ′, C ′) are newly set
Are set arbitrarily on the top surface of
Two sound wave receivers 28 (where 2
Only one sonic transmitter 26 and two sonic receivers 28 are shown. The remaining sound wave transmitters and sound wave receivers are respectively arranged behind the sound wave transmitter 26 and the sound wave receiver 26 shown in the figure. ). Sound wave receiver 2
8 can receive the sound wave emitted from each sound wave transmitter 26.

In the measurement of the distance, sound waves are simultaneously emitted from the sound wave transmitters 26 (see arrows), and the sound waves are received by the sound wave receivers 28 and arrive at the sound wave receivers 28 from the sound wave transmitters 26. The measurement can be performed by measuring the propagation time of the sound wave required for the above. The distance can be calculated by multiplying the propagation time by a propagation speed (sound speed) of the sound wave in water. Therefore, the six distances are determined by the magnitude of the tidal current in the construction area of the buried tunnel,
Irrespective of the water depth, etc., it can be measured easily and accurately.

A measuring device 30 for measuring the propagation time of the sound wave and converting it to a distance is provided on one pontoon 20. The measuring device 30 is electrically connected to each of the sound wave transmitters 26 and each of the sound wave receivers 28 via electric wires 32, and outputs a sound wave emission signal from each sound wave transmitter 26 and a reception signal from each sound wave receiver 28. In response to this, it has a calculation function for counting the propagation time and replacing it with a distance.

By the way, the propagation speed (sound speed) of the sound wave in water changes depending on changes in water temperature, salt concentration or water depth (water pressure). Therefore, the sound speed used for calculating the distance is a sound speed obtained in consideration of the sound speed in the water near the water surface and the sound speed in the water at the depth position (suspension depth) of the newly buried case 14, for example, the water surface It is desirable to use the average value of the sound speed in the vicinity and the sound speed at the depth position of the newly buried case 14. Thereby, the six distances can be known more accurately.

The sound speed in the vicinity of the surface of the water is
6 is calculated by dividing the known distance between the points (between AB, BC or CA) by the sound propagation time between the points, and the velocity of sound at the depth position of the new submerged box 14 is It can be calculated by dividing the known distance between the points on the box (between A'B ', B'C' or C'A ') by the sound propagation time between the points.

For this reason, for example, a sound wave transmitter / receiver having the function of the sound wave transmitter is arranged at each point (A, B and C) on the submerged work boat 16 and each point (A A ′, B ′ and C ′) are provided with a sound wave transceiver having the function of the sound wave receiver.

According to this, sound waves are transmitted simultaneously from the sound wave transmitter / receiver at each point on the submerged work boat 16 and the sound wave transmitter / receiver at each point on the newly buried box 14, so that sound wave propagation between the known points is achieved. Time (propagation time between AB, BC and CA) and (propagation time between A'B ', B'C' and C'A '), and sound propagation time between unknown points (Sound propagation time between AA ', AB' and AC '),
(When sound waves propagate between BA ', BB' and BC ') and (between CA', C
Sound propagation time between B ′ and between CC ′) can also be measured.

Further, by performing this measurement at each depth position of a newly buried submerged box, the vertical distribution data of the underwater sound velocity can be obtained.

The current positions (coordinates) of the two pontoons 20 at the time of the measurement of the six distances can be specified by the GPS surveying. The current position (coordinates) of the box 14 can be specified.

The measuring device 30 includes a radio wave receiver connected to one GPS antenna 22 of both pontoons 20 via an electric wire 34 for specifying the current position of the pontoons 20 and a calculation processing mechanism (not shown). Is built-in. In addition, a new submerged box 14 is prepared from the roll, pitch and yaw.
Posture can be specified.

By specifying the current position and the posture of the new burying box 14, the new burying box 14 with respect to the existing burying box 12 is specified.
Can be easily and accurately performed.

Further, instead of the illustrated example, the sound wave transmitting device 2
6 can be installed in the newly installed submerged box 14 and the sound wave receiver 28 can be installed in the submerged work boat 16.

The surveying device 24 can be recovered by diving work by a diver after connecting the newly buried box 14 to the existing buried box 12.

By the way, as shown in FIG. 2, the newly buried box 14 is hung on the hanging cable 18 via a jig 36 made of, for example, a frame having a rectangular planar shape, and is to be installed in the newly buried box 14. The sound wave receiver 28 is installed on a jig 36, and the jig 36 is newly operated by remote control.
Can be detachable from the server.

The newly buried box 14 is hung by a jig 36 via a plurality of short cables 38. Each cable 38 is, for example, a movable hook (not shown) provided on a jig 36.
Has been hooked on. In addition, the movable hook is, for example, by pulling a wire connected thereto, or
A motor (not shown) attached to the jig 36 is driven, and can be remotely moved using the driving force. Thereby, the hook with the cable 38 is released, and the jig 3 is released.
6 can be cut off from the newly installed storage box 14.

According to this, after the jig 36 is separated, the suspension cable 18 is wound up, so that the sound wave receiver 28 can be collected together with the jig 36. Therefore, the sound wave receiver 28 forming a part of the surveying device 24 can be collected without performing diving work.

Instead of the illustrated example, a sound wave receiver 28 is arranged on each pontoon 20 and a sound wave transmitter 26 is connected to the jig 3.
6 can be arranged as in the example shown in FIG.

As shown in FIG. 3, instead of installing the sound wave transmitter or the sound wave receiver at each of the four points on the submersible work boat 16, a sound wave transmitter / receiver 40 is installed. Instead of placing the sonic receiver or transmitter at each of the four points in 14, a transponder 42 can be installed.

In this example, each sound wave transmitter / receiver 40 emits an acoustic pulse, and each transponder 42 receiving the sound pulse returns a response pulse to each sound wave transmitter / receiver 40 (see arrows). The measuring device 30 connected to each sound wave transceiver 40 via the electric wire 44 measures the time required from transmission of the sound wave transceiver 40 to reception of the reply of the transponder 42, that is, propagation time, and calculates the distance.

According to this, since there is no need to connect the transponder 42 and the measuring instrument 30 with electric wires, it is not necessary to consider the strength against electric current of the electric wires 32 and the handling of the electric wires 32 in the example shown in FIG. 1 or FIG. It can be.

Also in this example, as in the example shown in FIG. 1, the sound wave transmitter / receiver 40 can be installed on the newly installed sink box 14, and the transponder 42 can be installed on the pontoon 20. In this case, the transponder 42
Is connected to the measuring instrument 30 via an electric wire.

Also, as in the example shown in FIG. 2, the newly buried box 14 is indirectly hung from the hanging cable 18 via the jig 36, and the jig 36 is removed from the newly buried box 14 by remote control. It can be detachable. At this time,
Fix the transponder 42 or the sound wave transceiver 40 to the jig 3
Place on 6. Thereby, the transponder 42 or the sound wave transmitter / receiver 40 can be collected together with the jig 36 without diving.

Next, referring to FIG.
The surveying device 24 is shown, including the inertial navigation device 46 installed above. The inertial navigation device 46 may be arranged in the newly installed tank 14.

The inertial navigation device 46 detects the six factors, namely, the surge, sway and heave of the newly installed submerged box 14, and the roll, pitch and yaw by a gyro, an inclinometer and an accelerometer incorporated therein. be able to. Signals indicative of these factors are sent to an analyzer 50 located on one of the pontoons 20 and connected to the inertial navigation system 46 via wires 48 for processing.

In this example, two GPS antennas 22
It is mounted on a pair of posts 52 which stand on the newly installed pit 14 at an interval from each other and project above the water. These GPS antennas 22 measure the current position of the newly buried box 14 by receiving from the satellite, and then
4 are removed from both posts 52 prior to subsidence for subsidence. The measured current position of the newly buried pipe 14 determines the initial position of the inertial navigation device 46. Therefore, both GPS antennas 22 are connected to the analyzer 50 via a pair of electric wires 54.

After the completion of the submersion, the inertial navigation device 46 can be recovered by diving. When the inertial navigation device 46 is disposed inside the new buried case 14, the new buried case 1
The disconnection of the electric wire 48 connected to 4 is performed by diving work.

In order to enable the inertial navigation system 46 to be recovered without diving operation, a new submerged box 14 is used in the same manner as shown in FIG.
Can be indirectly suspended from the suspension cable 18 via the jig 36 and the cable 38, and the inertial navigation device 46 can be disposed on the jig 36. At this time, both posts 52 are attached to the jig 36.
The post 52 can also be collected together with the jig 36 by being mounted on the upper side.

Under the application of the above-mentioned surveying method, after the new buried box 14 is guided to the vicinity of the existing buried box 12,
In order to achieve more accurate alignment between the four submersible boxes 12 and 12, a television camera 56 is arranged in advance at the connection end of the existing submerged box 12, and three light sources 58 are arranged at the connection end of the new submerged box 14. I do. More specifically, the television camera 56 and the light source 58 are connected to the bulkhead 6 provided at each connection end.
It is attached to 0. Instead of this example, the television camera 56 may be arranged at the connection end of the newly installed submerged box 14, and the three light sources 58 may be arranged at the connection end of the existing submerged box 12.

According to this, the illuminated light source 58 is photographed by the television camera 56, and is placed in the existing immersion box 12 and electrically connected to the television camera 56 through the image processing device 62. Can be more accurately specified. The specific data is transmitted from the image processing device 62 to a wireless transmitter 66 installed on land via an electric wire 64, and further transmitted from the wireless transmitter 66 to a wireless receiver placed on one of the pontoons 20. 68 (see arrow) and displayed on the measurement display device 70 electrically connected to the wireless receiver. Therefore, it is possible to perform the positioning operation of the newly buried box 14 while observing the measurement display device 70.

The surveying device 24 has been previously collected or omitted to avoid complication of the drawing.

Further, the number of the television cameras 56 is two or more,
Alternatively, the number of light sources 58 can be four or more,
According to this, it is possible to perform more accurate positioning of the newly installed sinking box 14.

The objects suspended by the submersible work boat 16 include, for example, fish reefs, offshore platforms, and bridge foundations, in addition to the newly installed submerged boxes 14.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a surveying device of the present invention.

FIG. 2 is a schematic view of a surveying device according to another example of the present invention.

FIG. 3 is a schematic diagram of a surveying device according to still another example of the present invention.

FIG. 4 is a schematic view of a surveying device according to still another example of the present invention.

FIG. 5 is a schematic side view of both an existing and a new submerged box to which a television camera and a light source are respectively attached.

[Explanation of symbols]

 10 Water Bottom 12 Existing Sinking Box 14 New Sinking Box (Object) 16 Sinking Ship 18 Hanging Cable 24 Surveying Device 26 Sound Transmitter 28 Sound Receiver 30 Measuring Instrument 36 Jig 40 Sound Transceiver 42 Transponder 46 Inertial Navigation Device

Claims (12)

[Claims] 1. A method for surveying an object suspended in water on a sinking work boat via a plurality of suspension cables, comprising: setting at least three points that are not in a straight line on the sinking work boat; Setting at least three points which are not on a straight line, and then, among the distances between each point on the sinking work boat and each point on the object, each point on the sinking work boat and on the object Simultaneously measuring at least six distances, including the distance between any of the at least three points of the object and the distance between each point on the object and any of the at least three points on the sinking workboat. Surveying method, including: 2. The surveying method according to claim 1, wherein the object comprises a new submerged box connected to an existing submerged box installed on the water floor. 3. The measurement of the at least six distances is performed by measuring a propagation time of a sound wave between the points,
Further, the at least six distances are calculated by multiplying a propagation time of the sound wave by a sound speed obtained in consideration of a sound speed near a water surface of the sound wave and a sound speed at a depth position of the object. Surveying method described in 1. 4. The sound velocity in the vicinity of the water surface is calculated by dividing a known distance between points on the sinking work boat by a sound propagation time between the points, and the sound velocity at a depth position of the object is The surveying method according to claim 3, wherein the distance is calculated by dividing a known distance between points on the object by a sound propagation time between the points. 5. A surveying device for an object suspended underwater on a submerged work boat via a plurality of suspension cables, wherein at least three points on the submerged work boat that are not in a straight line and a straight line in the object are provided. A sound wave transmitter installed at one of at least three points not on a line and a sound wave receiver installed at the other, and the sound wave transmitter connected to the sound wave transmitter and the sound wave receiver by electric wires, respectively. And a measuring device for measuring a sound wave propagation time between the sound wave receiver and the sound wave receiver and converting the sound wave propagation time into a distance. 6. The object is suspended from the hanging cable via a jig, and the sound wave transmitter or the sound wave receiver is disposed on the jig, and the jig is remotely operated by the object. The surveying device according to claim 5, wherein the surveying device is detachable from the surveying device. 7. A surveying device for an object suspended in water by a plurality of suspension cables on a sinking work ship, wherein at least three points on the sinking work ship which are not in a straight line and a straight line in the object are provided. A sound wave transceiver installed at any one of at least three points not on a line and a transponder installed at the other, and sound wave propagation between the sound wave transceiver and the transponder connected by an electric wire to the sound wave transceiver A measuring instrument for measuring time and converting this into distance. 8. The object is suspended from the hanging cable via a jig, the sound wave transceiver or the transponder is arranged on the jig, and the jig is separated from the object by remote operation. The surveying device according to claim 7, which is possible. 9. A surveying device for an object suspended underwater through a plurality of suspension cables to a submerged work boat for installation on a water floor, including an inertial navigation device installed on the object.
Surveying equipment. 10. The object is suspended from the suspension cable via a jig, and the inertial navigation device is disposed on the suspension jig, and the jig can be separated from the object by remote control. The surveying device according to claim 9. 11. The surveying instrument according to claim 5, wherein the object comprises a new buried box connected to an existing buried box installed on the water floor. 12. A television camera disposed at one of a connection end of the existing buried box and a connection end of the new buried box, and three light sources disposed at the other end. Item 13. The surveying device according to Item 11.