JPH0519374Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention relates to a moving mechanism for a sensor for measuring the behavior of the ground, etc.

<Conventional technology> In order to calculate the required amount of land reclamation during seabed reclamation, etc., this method is used to measure the depth to the sea floor, the amount of ground subsidence, etc., and to understand the behavior of the ground, structures, etc. A bendable casing pipe is installed between the measurement points on the object to be measured, and a sensor for measuring behavior, for example, an angle detector such as a borehole inclinometer, is moved inside the casing pipe periodically or at any time. A method of indirectly detecting and measuring the displacement of a point to be measured from the displacement of each point of a casing pipe is known.

Conventionally, when performing the above measurements at a submarine reclaimed site, for example, the movement mechanism for the sensor for measuring behavior within the casing pipe extended from the sea to the seabed was placed at the end of the casing pipe on the seabed side. At the same time, a pulley is installed on the side, and the wire is inserted into the casing pipe from the opening on the sea side end of the pipe, guided through the casing pipe to the above seabed side end, and after passing through the pulley placed there, the wire is inserted into the casing pipe again. It is known that a wire is provided by passing through the pipe and guiding it to the opening at the end on the sea side. Then, by connecting the behavior measurement sensor to one side of the wire that was passed through the casing pipe twice in this way, and towing the other wire to the sea side, the behavior measurement sensor's casing pipe was connected to the seabed. The configuration is such that the movement is performed in the direction of the side end.

<Problems to be solved by the invention> However, when using the above conventional moving mechanism, in addition to arranging the casing pipe, it is necessary to install a pulley,
In addition to requiring various complicated labor such as installing wires and double threading, in order to perform these tasks reliably, divers have to go down to the seabed and perform various operations. There are many problems such as the fact that there is a lot of danger in the work.

<Means for solving the problem> The moving mechanism of the sensor for measuring the behavior of the ground, etc., of this invention, which was devised in view of the above problem, is provided extending between the points to be measured, and has one end The casing pipe has a flexible casing pipe which is sealed and a sensor for measuring behavior that is movably provided in the casing pipe, and a fluid introduction hole is provided in the casing pipe portion at or near one end of the casing pipe. The gist is to move the behavior measuring sensor within the casing pipe toward the other end of the casing pipe by feeding pressurized fluid into the casing pipe through this fluid introduction hole.

In addition to this configuration, if a cable is led out from the above-mentioned one end of the casing pipe to the outside of the casing pipe and a behavior measurement sensor is connected to this cable, the cable can be operated from outside the casing pipe and pulled, and the behavior The measuring sensor can be moved in the direction of one end of the casing pipe.

In addition to angle detectors such as borehole inclinometers, sensors for measuring the behavior include external pressure sensors at each point of the casing pipe, for example, when the casing pipe is extended along the seabed during seabed reclamation, the casing pipe Examples include a pressure detector that detects water pressure based on the water level at each point in a pipe and converts the pressure value into an electrical signal.

Note that as the fluid used in the present invention, a liquid such as water or a gas such as air may be used as appropriate. However, for example, when the present invention is applied to a movement mechanism for a sensor for measuring behavior in a casing pipe installed in the seabed, if the fluid is a harmful liquid such as oil or a harmful gas, these fluids may be There is a risk that it may get mixed into the water and cause marine pollution. Therefore, in such a case, it is preferable to use water, air, or the like, which does not cause contamination, as the fluid.

<Operation> As described above, by using the method of moving the behavior measurement sensor in the casing pipe using pressurized fluid, it is possible to install a pulley on the seabed as in the past,
Furthermore, it is possible to provide a convenient and simple moving mechanism without having to construct a structure that requires complicated and dangerous work such as threading a wire through a casing pipe to the pulley.

<Embodiments> Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1A, a bendable and hollow casing pipe 3 extends from a portion of the seabed 1 in contact with the bottom of an embankment 2 built in the sea to the sea, and a hollow casing pipe 3 is provided on the seaward end side of the casing pipe 3. Various ground equipment 4, which will be described later, is provided.

As shown in FIG. 1B, the bottom end 3a of the casing pipe 3 is formed into a porous shape for use as a strainer to prevent floating solids from entering the casing pipe. It is possible to discharge seawater from inside the pipe to the outside of the pipe, or to allow seawater to flow into the pipe from outside the pipe. In addition, the sea edge of the cassing pipe 3 is 5a of seal pipes and 5A, seal patskin 5B, 5c of seal grease 5D, 5D seal grease, 5D, seal grease, 5C, 5C, 5C, seal pipe plate, which is sequentially provided inside the seal pipe. It is sealed by a sealing member such as a screw plate 5d.

On the other hand, inside the casing pipe 3, there is housed an in-hole inclinometer 6 of a known structure and a pressure block 7 integrally connected thereto. Of these, the borehole inclinometer 6 is held within the casing pipe by a pair of wheel shafts each having a wheel rotatably attached to each end, and is configured to move within the pipe while closely contacting the inner surface of the pipe. It's getting old. In order to prevent the axis of this type of borehole inclinometer 6 from rotating within the casing pipe and to perform accurate measurements, there is a
It is preferable to provide a long groove for engaging the wheel. The pressure block 7 is a hollow block made of a thin elastic material, and a large number of annular protrusions are formed on the surface of the block 7, which are pressed against the inner peripheral surface of the casing pipe.

These inclinometers 6 and pressure blocks 7 have
One end of cable 8 is connected. The other end of the cable 8 is connected to the cable drum 9 through the seal member at the sea side end of the casing pipe 3. This cable drum 9 functions to store the cable 8 by winding it around its outer periphery. In addition, the cable 8 is used not only for pulling the borehole inclinometer 6 and the pressure block 7, but also as a signal transmission line for the borehole inclinometer 6, and the electric signal from the borehole inclinometer 6 is
Via the cable 8 and the external terminal of the cable drum it is input to a data acquisition device 10 for signal analysis and recording. Further, a fluid introduction hole 3b is formed in the side surface between the sea-side end of the casing pipe 3 and the pressure block 7. This fluid introduction hole 3b communicates with the drain port of the hydraulic pump 11 via a suitable pipe line. In addition, 12 in the figure is a water tank.

In the moving mechanism having the above configuration, when moving the borehole inclinometer 6 from the sea-side end of the casing pipe toward the sea-bottom end, pressurized water is allowed to flow into the casing pipe 3 using the water pressure pump 11. The pressurized water moves the pressure block 7 to the left in the figure, and the inclinometer 6 connected to the pressure block 7 also moves in the same direction within the casing pipe 3. At this time, the seawater in the pipe between the pressure block 7 and the bottom end 3a of the casing pipe 3 flows out into the sea from the porous bottom end 3a as described above. The inner inclinometer 6 moves smoothly inside the casing pipe 3. Then, electrical signals corresponding to the inclination angle at each position in the casing pipe 3 are sequentially, continuously or intermittently inputted from the borehole inclinometer 6 to the data acquisition device 10 via the cable 8 and the cable drum 9, These signals are used for analysis as data for measuring seabed behavior.

In addition, when moving the borehole inclinometer 6 and the pressure block 7 to the sea side after the movement and data collection of the borehole inclinometer 6, etc. are completed, the cable drum 9 is operated to move the cable 8. Just wind it up.

In addition to the above-mentioned embodiments, for example, as shown in FIG.
This block 13 also uses a pressure sensor 14 that converts the water pressure received at each point of the casing pipe into an electrical signal based on the water level, and sends the electrical signal of the pressure sensor 14 to the data acquisition device 10 via the cable 8. The depth from the sea surface at each location on the ground may be calculated based on this pressure signal, and the behavior of the seabed may be determined from changes over time in this calculated value at each location. In that case, as shown in the figure, if this pressure sensor and an angle sensor such as the inclinometer 6 in the hole similar to the above are used in succession, the measurement accuracy will be further improved.
Needless to say, it will be possible to accurately determine the behavior of the seabed, such as the depth to the seabed and the amount of subsidence of the seabed, and the amount of land reclamation required will be accurately determined.

<Effects of the invention> According to the movement mechanism of the sensor for measuring the behavior of the ground, constructed as described above, it is easy and simple, without requiring the complicated and dangerous work of conventional mechanisms. It is possible to obtain a unique mechanism.

[Brief explanation of drawings]

Fig. 1A is an explanatory diagram showing an overview of the mechanism for measuring the behavior of the ground on the seabed, Fig. 1B is an explanatory diagram showing the structure of the mechanism of an embodiment of the present invention, and Fig. 2 shows a part of another example. FIG. 3...Casing pipe, 6...Bore inclinometer,
7...Pressure block, 8...Cable, 9...Cable drum, 10...Data acquisition device, 11...
Pressure pump, 13...Pressure sensitive/pressure moving block, 14
……pressure sensor.

Claims (1)

[Claims for Utility Model Registration] 1. A bendable casing pipe that extends between measurement points and is sealed at one end, and the behavior of a casing pipe that is movable within the casing pipe. A fluid introduction hole is formed in the casing pipe portion at or near the one end, and the behavior is determined by feeding pressurized fluid into the casing pipe through the fluid introduction hole. A moving mechanism for a sensor for measuring behavior of the ground, characterized by moving a measuring sensor within a casing pipe toward the other end of the casing pipe. 2 A cable led out from the one end of the casing pipe is connected to the behavior measurement sensor, and by pulling this cable from the outside of the casing pipe, the behavior measurement sensor is connected to one end of the casing pipe. 2. The moving mechanism according to claim 1, wherein the moving mechanism is moved in the direction of the lower part. 3 Utility model registration claim 1, characterized in that the behavior measuring sensor is an angle detector
The moving mechanism according to item 1 or 2. 4. The movement mechanism according to claim 1 or 2, wherein the behavior measuring sensor is a pressure detector that converts external pressure at each point of the casing pipe into an electrical signal and outputs the electrical signal. .