JPS5921206A - Landing state examining device of cable laid on submarine bottom - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for investigating the landing state of a cable laid on the underwater bottom.

For example, when installing a cable on the seabed, if the seabed is made of uneven hard rock, the cable
This may result in a so-called overbridge pattern in which more than one convex part is laid over a concave position. In this case, the contact portion between the cable and the rock may slide for a long period of time due to the influence of the tidal current7, ultimately leading to the risk of an accident such as breakage of the cable. Therefore, after the cable is installed,
It is necessary to check whether the vessel has completely landed on the seabed or not, and if there is an overbridge, it must be removed.

Traditionally, this inspection has been carried out by direct means, such as by taking pictures with a television camera beyond the diver's visual range.
These operations were completely impossible due to the deep water and poor visibility.

The present invention was made in view of the above-mentioned situation, and does not involve direct means such as visual inspection by divers or camera photography, but indirect means that can be easily and reliably carried out even in situations where visibility is poor. The object of the present invention is to provide a device for investigating the landing state of a cable laid on the water bottom, which is capable of detecting the landing state of a pull on the water bottom.

The landing state investigation device for a cable laid on the water bottom of the present invention includes a rotating investigation member loosely inserted into a cable laid on the water bottom and rotatably attached to the outer circumference of the cable;
When the cable formed on the outer periphery of the rotating investigation member cannot contact the bottom surface such as a concave position of the water bottom when the cable is laid on the water bottom, the water flow at the water bottom still moves in the axial direction of the cable of the rotating investigation member. A rotary drive unit formed to rotate the rotation investigation member around the outer periphery of the cable and the rotation investigation member loosely fitted on the cable are rotatably connected in the axial direction, and the cable a non-rotating investigation member to which a pulling wire rope is attached to pull the rotating investigation member along the rotational investigation member; and when the rotating investigation member moves through the concave position, detects the water flow, etc. and the number of rotations driven by the rotational drive unit. and a means to which a transmission device is attached for transmitting a signal of the rotational speed detected by the detection device to a boat on the water.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an apparatus for investigating the landing state of a cable installed on the underwater bottom according to the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 is an explanatory diagram of a landing situation investigation state on the seabed surface, and FIG. 2 is an explanatory diagram of a state of moving through a concave part of the seabed. In the figure, 1 is a cable, and 2 is a rotational investigation member formed in the shape of an ellipsoid or oblong sphere. A hole (not shown) larger than the outer diameter of the cable 1 is drilled in the center in the longitudinal direction, and the cable 1 is loosely inserted through the hole. It is rotatably mounted.

As shown in FIG. 6, a rotation drive section 6a consisting of a diagonal groove is formed on the outer periphery of the rotation investigation member 2, and the rotation investigation member 2 is pulled along the cable 1 and rotated by draining water. The rotational driving force is generated by the tidal current.

Further, inside the rotation investigation member 2, a rotation speed detection device 7 shown in FIG. 4 is built-in. The rotational speed detection device 7 includes a cylindrical outer sheath 8 that is fixed to the rotational investigation member 2 so as not to rotate, and a cylindrical outer sheath 8 that rotates integrally with the rotational investigation member 2 on the outer periphery of the cable 1 within the outer sheath 8. At the same time, it has a plurality of electrodes 10 arranged in the radial direction centered on the cable 1 side, and the mercury 11 of the flowing electrode filled in the white lower part of the outer cover part 8 and the electrode 1.
0 and an inner core portion 9 formed so as to be able to contact each other.

Reference numeral 6 denotes a non-rotating investigation member, which is loosely inserted into the cable 1, is rotatable between it and the rotating investigation member 2, and is integrally connected to the cable 1 in the axial direction. It is formed so that it can be pulled along the arrow in the direction of the arrow.

5 is the seabed surface, and 15 is a concave position.

In the above structure, the rotating investigation member 2 and the non-rotating investigation member 6 are inserted into the cable 1, and the cable 1 is inserted into the seabed surface 5.
At the same time or after the cable is laid, the index wire rope 4 is towed from the sea and moved along the cable 1. and,
When the cable 1 reaches the position where it is laid on the concave position 15 as shown in FIG.
is driven to rotate. The frictional force acting on the rotating investigation member 2 is different when the cable 1 is on the concave position 15, that is, when it is floating in the water, and when it is on the bottom of the seabed 5. It appears as a difference. The rotation of the rotating investigation member 2 is detected as an on-off electrical signal between the electrode 10 and the mercury 11 in the detection device Z, and is transmitted to a ship on the sea via a known transmission device (not shown).

Incidentally, the rotating investigation member 2 may be formed in two pieces. 2 As described above, the landing state investigation device for a cable laid on the bottom of the water according to this embodiment is capable of attaching the rotating investigation member from the sea via a towing wire rope along the cable. When the cable is moved to a position where it is laid in a concave position on the seabed, etc., since the rotating survey member has not landed, it is driven by water current, etc., and the signal is transmitted to the sea, thereby checking the cable's laying condition. can be detected at sea. And, even in a case where underwater C visibility is not available, the cable landing state on the seabed can be detected simply, easily and reliably indirectly, unlike the conventional method. In addition, the survey is not limited to a concave location, and even if a cable is installed between a mountain peak, a mountain range, etc. on the ocean floor and a low land, for example, it can be investigated in the same way.

FIG. 5 shows another embodiment of the rotational drive part 7. In the embodiment shown in FIG. In this method, a plurality of rotating rods are formed obliquely on the outer periphery of the rotary drive part 2 (rotating at ~, the drive part 61), and the rotary investigation member 2 is rotated by receiving the water flow. is formed.

FIG. 6 shows another embodiment of the rotational speed detection device 7. In FIG. Fourth
The difference from the embodiment shown in the figure is that in the above embodiment, the electrode 10 of the inner core part 9 of the detection device 7, which rotates together with the rotating investigation member 2, and the electrode of the mercury 11 of the non-rotating part are turned on and off. In contrast, the detection device 7 of this embodiment uses a rotating permanent magnet 12 and a non-rotating coil 1.
6.

U11, permanent (a,, f) fixed to the rotating investigation member 2
12 and a coil 16 provided on the non-rotating investigation member 6 and investigated by the false one law of the permanent magnet 12, the permanent magnet 1
The starting force or pulse accompanying the rotation of 2 is taken out as a borrow, and it operates in the same manner as the detection device shown in FIG. Note that 14 is a hole provided in the rotational investigation member 2 through which the cable 1 is inserted.

As described above, the device for investigating the landing state of cables laid on the underwater bottom of the present invention does not use direct means such as naked eye inspection or camera photography by sailors, but indirect inspection in situations where visibility is poor. This has the effect of easily and reliably detecting the landing state of the cable at the bottom of the water, even when the cable is in the water.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the state of investigation of the landing state on the seabed of the embodiment of the landing state investigation device for a cable laid on the underwater bottom according to the present invention, and Fig. 2 is a state in which the concave position on the seabed has been shifted from the position shown in Fig. 1. , FIG. 6 is an explanatory diagram of the rotation 5 scolding part of the rotation investigation member of FIG. 1, FIG. 4 is a detailed diagram of the rotation speed measuring device of FIG. 1, and FIGS. FIG. 2 is an explanatory diagram of another embodiment of the rotation, drive unit, and detection device of the rotation investigation member of FIG. 1; 1: Cable, 2: Rotating investigation member, 6: Non-rotating investigation member, 4: Traction wire Vj-zo, b: Seabed surface, 6a, 6b: Rotating, small moving part, 7: Detection device, 8:
Outer covering part, 9: Inner core part, 10: Electrode, 11. Mercury, 12.
Magnet, 16: Coil, 15. Concave position. Figure 2 Kidney 3 Figure j [13,2

Claims (1)

[Claims] 1. A rotating investigation member that is loosely inserted into a cable laid on the bottom of the water and rotatably attached to the outer periphery of the cable, and a rotating investigation member formed on the outer periphery of the rotating investigation member, and the cable is laid on the bottom of the water. When the bottom surface cannot be contacted, such as in a concave position on the bottom of the water, the rotary probe is configured to rotate the rotary probe toward the outer periphery of the cable by moving the rotary probe toward the cable axis or by moving the rotary probe in the direction of the cable axis. A non-rotating investigation device in which the drive part and the rotating investigation member loosely fitted onto the cable are rotatably connected in the axial direction, and a traction wire rope for pulling the rotating investigation member along the cable is attached. "When the member and the rotational investigation member move through the concave position, etc." 1. Water flow, etc. and rotation, a detection device that detects the rotational speed driven by the drive unit, and a detection device that detects the rotational speed detected by the detection device. 1. An apparatus for investigating the landing state of a cable laid on the underwater bottom, characterized in that it is provided with a means to which a transmission device is attached for transmitting a signal to a water vessel.