The role of underwater robot in the installation of the catheter rack

The role of underwater robot in the installation of the catheter rack

(1) Geomorphological survey.

Before the installation of the catheter frame, the seasurface landscape of the installation area of the catheter rack is used to carry out geomorphological examination to confirm the existence of natural pits, pile leg pits, seafloor foreign bodies, etc., if there is uneven surface of the seafloor, further filling needs to be done according to the situation.

(2) The support in the process of straightening the catheter.

After the catheter frame is lowered, the attitude of the catheter frame must be leveled and corrected, and the distance, angle, contact situation and so on of the pipe rack anti-sink plate and the sea bed surface must be measured by THE ROV, and the construction personnel shall control the duct frame down according to the above information.Depending on the design of the catheter frame, it is sometimes necessary for the ROV to open some valves underwater to achieve a leveling of posture after the catheter holder is under water.

(3) Catheter rack positioning.

The ROV travels to the conduit or other markings, marking information such as depth, direction, coordinates, and so on.

(4) Guide the pile.

Using underwater robot to assist in observation, to ensure that the pipe frame steel pile is successfully inserted into the horn port, sometimes it is necessary to guide the steel pile down to the horn port insert, and guide the crane pressure relief recovery.

(5) Monitor piling.

In piling operations, it is necessary to use ROV-guided piling hammer pile, after the success of the pile, but also to monitor the piling situation, such as steel pile angle, mud, equipment operating status.

(6) Grouting operation.

After the steel pile is in place, the gap between the steel pile and the leg of the pipe rinting pile is to be grouted. Use ROV to monitor the process of nitrogen and fresh water cleaning between the inner wall of the pile foot and the outer wall of the pile, track and monitor the process, feed back the information to the grouting operator. Depending on the design of the catheter rack, some conduit racks also require the ROV to open or close some valves to complete the grouting operation.

(7) Auxiliary installation.

In the above construction, by using ROV to cut some auxiliary installation of cables / wire ropes, floats , floats and other facilities, remove / install the card ring, etc.

(8) Investigation after installation of the catheter rack.

After the installation of the catheter rack completed all of the above construction process, but also to use underwater robot to do further system inspection, check the contact between the bottom of the foot of the grout and the sea bed surface, the valve switch status of the catheter rack is correct, the catheter rack equipment is intact, and retain the relevant video image, get the final pipe rack installation investigation report, so that the entire installation of the catheter rack is completed.

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