JPH06186345A - Submarine cable type crust survaying structure - Google Patents

Abstract

PURPOSE:To provide a submarine cable type crust survaying system in which a pressure housing is restrained from moving about the axis of submarine cable under the bottom of the sea. CONSTITUTION:A pressure housing 1 is provided, on one side thereof, with a pair of forked I/O submarine cables 2 so that connection of cable is not required on the other side but an anchor 15 is fixed to the other side. The forked structure on one side and the anchor on the other side allow flexible installation of a submarine cable type crust survaying system on the bottom of the sea.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a submarine cable type crust observation device, and more particularly to a submarine crust observation device structure for accommodating sensors such as a seafloor seismometer and a seafloor inclinometer to observe a crust change.

[0002]

2. Description of the Related Art As shown in FIG. 3, a conventional submarine cable-type crustal observation device structure has a submarine cable 2 at both ends of a cylindrical pressure-resistant housing 1a, an anchoring bracket 3, a joint ring 4
a, having a structure connected via a clamp ring 5a,
Alternatively, as shown in FIG. 4, for example, a non-cylindrical coupling cage 16 is mounted around the pressure-resistant housing 1a, and the others have the same structure as in FIG. Was there.

[0003]

In the conventional submarine cable type crustal observation device structure, that is, the structure shown in FIG. 3, since the pressure-resistant housing is cylindrical, the submarine cable axis line may depend on the geological condition of the seabed or the submarine current. It is easy to rotate, and the coupling with the seabed is not always good. Further, in the structure shown in FIG. 4, the structure of the coupling cage is large in scale and does not have a balance function of absorbing unevenness on the sea floor, so that the static balance can be broken under a hard sea floor. It is considered to have a problem in long-term crustal observation.

[0004]

According to the present invention, a pressure-resistant housing for accommodating a submarine crust observation sensor and an internal unit for amplifying and transmitting the sensor output, a submarine cable for signal transmission and power supply, and the submarine cable are retained. In a submarine cable type crust observation structure having a cable retaining metal fitting for connecting the cable retaining metal fitting and a joint ring and a clamp ring for connecting the cable retaining metal fitting to the pressure resistant housing, signal and power input / output on one end side of the pressure resistant housing. A pair of the submarine cables for use in a bifurcated manner to the joint ring and the clamp ring via the cable anchoring fittings, and a submarine is attached to the other end side of the pressure-resistant housing that does not require cable attachment. It is configured to attach a coupling member to the pressure-resistant housing, and the coupling member has a gimbal. It may be an anchor.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a side sectional view of a submarine cable type crust observation structure according to one embodiment of the present invention, and FIG. 2 is a perspective view when a gimbaled anchor is applied to a coupling mounting plate in this embodiment.

A cylindrical pressure-resistant container 1 containing an internal unit 8 composed of a sensor and a circuit portion has one end side with a joint ring 4 and clamp rings 5, 6 and 7,
The pair of submarine cables 2 are connected to two strain metal fittings 3 which are held in a bifurcated shape. The submarine cable 2 is connected to the internal unit 8 via a cable 11. On the other hand, on the other end of the pressure-resistant housing 1 where the submarine cable 2 is not connected, a component 15 for coupling the seabed and the pressure-resistant housing 1 (gimbal 14 and anchor 13 shown in FIG. 2 in this description) is attached to the coupling component. It is attached via the plate 12. Therefore, the pressure-resistant housing 1
The gimbal 9 and gimbal pin 1 shown in FIG.
Two retractable metal fittings 3 each having a universal joint of 0 and a coupling component 15 having an anchor with a gimbal are provided on the other end side.

According to the structure of this embodiment, the retractable metal fittings 3 required for signal transmission and power supply can be arranged in a bifurcated manner on one side, so that there is an effect of suppressing the rotational movement of the pressure-resistant housing 1 and the submarine laying condition. Depending on the situation, the effect of avoiding the undersea suspension of the pressure-resistant housing 1 due to the inquiry of the undersea cables 2 from both sides can be expected. Furthermore, with the gimbaled anchor provided at the other end, it can be expected that the pressure-resistant housing 1 can be installed relatively along the seafloor topography and seafloor geology with the function of the universal joint. Further, the coupling component 15 only needs to be attached to the mounting plate at the end portion, and there is an advantage that various shapes can be easily selected.

[0009]

As described above, the present invention has the structure in which the submarine cable is installed only on one side of the pressure-resistant housing.
The other end can be used to attach parts to improve the coupling performance between the housing and the seabed, and if the gimbaled anchor as shown in the example is used as a coupling part, it functions well in balance with the cable retention metal fittings of the pressure housing. It is possible to suppress rotational movement, and it can be expected to have great effects as a submarine cable type crustal observation structure that requires precise observation for a long period of time.

[Brief description of drawings]

FIG. 1 is a side sectional view of an embodiment of the present invention.

FIG. 2 is a perspective view of an embodiment of the present invention.

FIG. 3 is a side sectional view of a conventional structure (cageless type).

FIG. 4A is a side sectional view, and FIG. 4B is a sectional view taken along the line AA of FIG.

[Explanation of symbols]

 1, 1a Pressure-resistant housing 2 Submarine cable 3 Retaining metal fittings 4, 4a Joint ring 5, 5a, 6, 7 Clamp ring 8 Internal unit 9 Gimbal 10 Gimbal pin 11 Cable 12 Coupling component mounting plate 13 Anchor 14 Gimbal 15 Coupling component

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasunori Hitai 1-403, Kosugi-cho, Nakahara-ku, Kawasaki-shi, Kanagawa NEC Electric & Marine Engineering Co., Ltd.

Claims (2)

[Claims] 1. A pressure-resistant housing for accommodating a submarine crust observation sensor and an internal unit for amplifying and transmitting sensor output, a submarine cable for signal transmission and power supply, and a cable anchoring metal fitting for retaining the submarine cable. In a submarine cable-type crust observation structure having a joint ring and a clamp ring for connecting the cable anchorage to the pressure-resistant housing, a pair of the seabed for inputting and outputting a signal and a power source on one end side of the pressure-resistant housing. A cable is attached to the joint ring and the clamp ring in a bifurcated manner via the cable retention fitting, and the coupling between the seabed and the pressure enclosure is not necessary at the other end of the pressure enclosure. A submarine cable-type crustal observation structure, characterized in that it is configured so that members for mounting are attached. 2. The submarine cable-type crustal observation structure according to claim 1, wherein the coupling member is an anchor with a gimbal.