JPH0613896Y2 - Moving mechanism of underwater maintenance inspection device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a moving mechanism of an underwater maintenance / inspection device used for replacement work of a control pod installed in a wellhead device of a well drilled on the sea floor. .

[Prior Art] When inspecting a wellhead device installed on the seabed, for example, a control pod attached to the wellhead device needs to be replaced regularly or when a failure occurs. As an example, the case of exchanging the control pod will be described. Conventionally, a method has been adopted in which an old control pod is pulled up to the sea and collected, and then a new control pod is transported to the seabed and installed.

[Problems to be solved by the invention] However, in the case of such a conventional control pod exchange method, as described above, the old control pod must be pulled up to the sea and then the new control pod must be transported to the seabed. It could not be replaced by diving, and it took a long time to replace it.

Therefore, the present invention is intended to provide a moving mechanism of an underwater maintenance / inspection device which can be performed by one dive even when the control pod is replaced so that the time required for the replacement work can be shortened. .

[Means for Solving the Problems] In order to achieve the above object, the present invention mounts an underwater maintenance / inspection device main body frame on the lower part of a remotely operated submersible work boat, and horizontally installs a trolley in the main body frame. The trolley is movably equipped with a gripping device for detachably gripping the devices through an elevating device, and the devices gripped by the gripping device are temporarily placed in the body frame. A plurality of spaces for this are provided.

[Operation] Since the equipment can be moved horizontally by the trolley in the body frame and the equipment can be raised and lowered by the elevating device, the equipment can be maintained and inspected with one seat of the body frame. When replacing the control pod as an example of equipment, by operating the submersible work boat, carry the main body frame to the upper part of the old control pod to be replaced, and temporarily place the new control pod that was carried The old control pod is pulled up into the main frame while it is temporarily placed in the space, and the new control pod is installed with the old control pod that has been pulled up temporarily placed in another temporary placement space. Therefore, replacement is performed by diving the body frame once.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

1 to 3 show an embodiment in which the control pod is replaced according to the present invention.
An underwater maintenance / inspection device main body frame 2 having a frame structure is integrally attached to the lower part of the (remotely operated unmanned submersible work boat) 1 with a bolt or the like, and extends in the front-rear direction at an upper position in the main body frame 2. The rail 3 is provided with a trolley 5 which can be moved back and forth along the rail 3 by driving a hydraulic motor (or electric motor) 4, and the trolley 5 is extended and contracted in multiple stages. In order to fix the head side, which is the upper end of the hydraulic cylinder 6 for raising and lowering (two-stage telescopic type in this embodiment), and to detachably hold the control pod 7 on the piston rod of the hydraulic cylinder 6. Auxiliary member 8'in which the running tool 8 of FIG.
The running tool 8 can be lifted and lowered between the position inside the main body frame 2 and the position below the main body frame 2 by the expansion and contraction movement of the hydraulic cylinder 6, and further below the main body frame 2. Is provided with pedestals 9 and 10 for temporarily placing the control pod 7 at the front position and the rear position.

The running tool 8 has a ring shape having a notch so as not to interfere with the front and rear pedestals 9 and 10 when it is moved up and down in the central portion of the main body frame 2, and the center of the ring is located at a required inner circumferential position. Hydraulic plunger that can project toward
It is configured with 11.

Brackets 12 and 13 are provided on the front side and the rear side of the main body frame 2 so as to project to the front and the rear, respectively, and a main guide pin 14 having a large diameter is attached to the bracket 12 on the front side and a rear side portion. Auxiliary guide pins 15 having a small diameter are vertically supported by the bracket 13 of the above, and each guide pin 14 and 15 is a multi-step telescopic type (in this embodiment, a two-step telescopic type).
When the main body frame 2 is placed in the opening 20 of the cover 19 for protecting the wellhead device 18, the guide pins 14 can be moved up and down by the expansion and contraction of the hydraulic cylinders 16 and 17. The holes 15 and 15 are inserted into the holes 21 and 22 formed around the opening 20.

When the old control pod 7 installed on the wellhead device 18 is replaced with a new control pod 7'by using the moving mechanism of the underwater maintenance / inspection device having such a configuration, the new control pod 7'is replaced by a new one on the ocean (on the carrier) in advance. Insert the control pod 7'into the running tool 8 and insert each plunger 11
The new control pod 7'is held by the running tool 8 by making the running tool 8 protrude. or,
The trolley 5 is driven by driving the hydraulic motor (or electric motor) 4.
The position of the new control pod 7'is adjusted so that the new control pod 7'is suspended and supported in the central portion of the main body frame 2 so as not to be unbalanced during swimming.

In this way, the main body frame 2 in which the new control pod 7'is suspended and supported is transferred to the seabed by remotely operating the ROV 1 and placed on the opening 20 of the cover 19 that protects the wellhead device 18. Let At this time, as described above, since the new control pod 7'is located in the central portion of the main body frame 2 and the front and rear are balanced,
The operation of ROV1 is performed stably. Next, the multistage hydraulic cylinders 16 and 17 on the front and rear sides of the body frame 2 are operated to insert the guide pins 14 and 15 into the holes 21 and 22 of the cover 19 to fix the position of the body frame 2. .

When the position of the main body frame 2 is fixed, the trolley 5 is then moved rearward (rightward in the figure), and the new control pod 7 ′ that has been suspended and supported is lowered onto the pedestal 10 at the rear to temporarily move it. The trolley 5 is returned to the original central position, and the running tool 8 is positioned in the central part of the main body frame 2 again (state of the two-dot chain line in FIG. 1). Next, the lifting hydraulic cylinder 6 is extended, the running tool 8 is lowered below the main body frame 2 and positioned at the old control pod 7 portion on the wellhead device 18, and the old control pod 7 is gripped by the running tool 8. Let Then, after shortening the lifting hydraulic cylinder 6 and pulling up the old control pod 7 into the main body frame 2, the pulled up old control pod 7 is moved to the front of the trolley 5 (left in the figure). The hydraulic cylinder 6 is moved to the front pedestal 9 and the hydraulic cylinder 6 is extended and temporarily placed on the pedestal 9 (indicated by a chain line in FIG. 1).

After that, the trolley 5 is moved backward, and the new control pod 7 ′ temporarily placed on the pedestal 10 at the rear is gripped by the running tool 8, and the gripped new control pod 7 ′ is attached to the main body frame 2. The new control pod 7 ′ is lowered and installed on the wellhead device 18 by moving to the central portion and extending the lifting hydraulic cylinder 6 again at that position. After installing the new control pod 7 ', pull up the running tool 8 into the main body frame 2, and attach the cradle 9 at the front.
The old control pod 7 temporarily placed on the top is gripped, and the gripped old control pod 7 is moved to the center. In this state, the guide pins 14 and 16 inserted into the holes 21 and 22 are pulled out, the ROV 1 is operated to pull up the main body frame 2 to the sea, and the old control pod 7 is recovered.

As described above, the new control pod 7'and the old control pod 7 can be exchanged by simply diving the body frame 2 into the sea once.

In the above embodiment, the replacement work of the control pod has been described, but it is optional to make the running tool 8 hold other devices and tools other than the control pod to perform the maintenance work. Needless to say, various changes can be made without departing from the spirit of the invention.

[Effect of the Invention] As described above, according to the moving mechanism of the underwater maintenance / inspection device of the present invention, the trolley that moves horizontally to the underwater maintenance / inspection device main body frame mounted on the lower portion of the remotely operated submersible work boat. Since a device gripping device supported by the trolley so as to be able to move up and down and a space for temporarily storing the devices are provided,
The equipment gripping device can be horizontally moved by a trolley in the sea, and can be freely moved up and down, so that work such as device replacement can be performed smoothly, especially for replacement work of the control pod attached to the submarine wellhead device. If applied, the replacement work can be performed by diving the main body frame once, and therefore the time required for the replacement work can be significantly shortened, and the efficiency of maintenance of other equipment can be improved. It has excellent effects such as good work.

[Brief description of drawings]

1 is a side view showing an embodiment of a moving mechanism of an underwater maintenance / inspection device of the present invention, FIG. 2 is a view taken along the line II-II in FIG. 1, and FIG.
The figure is a view taken along the line III-III in FIG. 1 …… ROV, 2 …… Underwater maintenance / inspection device main frame,
5 ... Trolley, 6 ... Lifting hydraulic cylinder, 7, 7 '...
… Control pod, 8 …… Running tool, 9,10
…… A cradle.

Front page continued (72) Creator Yoshihiro Muraki 1-1-1, Toyosu, Koto-ku, Tokyo Ishikawajima Harima Heavy Industries, Ltd. Tokyo No. 1 Factory (72) Creator Shohei Furukawa, Shin-Nakahara-cho, Isogo-ku, Yokohama, Kanagawa Prefecture Ishikawashima Harima Heavy Industries Co., Ltd. Yokohama Second Factory (56) Reference JP 55-36591 (JP, A) JP 56-120493 (JP, A) JP 60-92592 (JP, A) Special Public Sho 58-39322 (JP, B1)

Claims (1)

[Scope of utility model registration request] 1. An underwater maintenance / inspection device main body frame is attached to a lower portion of a remotely operated submersible work boat, and a trolley is horizontally movable inside the main body frame, and equipment is detachably held in the trolley. The underwater maintenance is characterized in that the holding device for supporting the holding device is supported via an elevating device, and a plurality of spaces for temporarily placing the devices held by the holding device are provided in the main body frame. Inspection device moving mechanism.