FI65954B - FLYTDOCKA - Google Patents

Description

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Patent- och refiefntyrel — n '' Awflltm mh «deSudlSfcri ^ 30.04.84 (32) (33) (31) * n *** eweHtee». »EdH report (71) Götaverken Arendal AB, Arendal, Gothenburg, Sweden-Sweden (SE) (72) Thorsten Lundberg, Askim, Sweden-Sweden (SE) (74) Berggren Oy Ab (54) Floating dock - Flytdocka

A conventional floating dock comprises a load-bearing base part and side edges arranged along its long sides, which are intended to give the lowered dock the necessary stability. The bottom has a large number of sink tanks which are filled with water when the dock has to be lowered and which then have to be pumped empty when the docked vessel has to be raised.

The pumps are usually placed at the bottom of the side edges while the drive motors are placed high at the top of them, in spaces that are at least most of the time above the water surface.

The transmission is provided by long vertical shafts, which causes major bearing and lubrication problems. The outlets of the pumps are directed laterally outwards horizontally.

To make a site for a shipyard in a lowered position, a pit is often dredged for the shipyard and it is obvious that there is a high risk of such a pit being filled with sludge.

65954

In terms of force, the most stressed part of the yard is located along the centerline of the yard and it is desirable to perform local reinforcements at this point.

The above considerations can be taken into account if, according to the invention, a bottom surface is formed in the bottom part extending downwards from its long sides towards the longitudinal centerline, and that the service pipe extends from the center through the bottom part and includes pumps for draining

The service tube has a reinforcement of the longitudinal central part of the base part, which together with the rise of the base means that the substance is good in terms of strength. abuse. The bottom to be carried means small amounts of wastewater, and the placement of the pumps allows the use of short suction lines. The downward outlets of the pumps allow the dock pit to be automatically cleaned at each docking event.

An embodiment of the invention will now be described with reference to the accompanying drawing, which shows a part of a cross-section through a floating dock according to the invention.

The dock comprises a substantially rectangular bottom part 10 and side edges 11 arranged along its long sides, only one of which is shown in the drawing. In a conventional manner, the base part has immersion tanks 12 located inside the central part of the base part symmetrically around the center line C1 and along the long sides 13. These tanks are divided into a plurality of chambers in the longitudinal direction of the yard, and passageways divided into compartments are formed in each tank by means of longitudinal bulkheads 14. The bulkhead 15 forms a watertight separating wall between the tanks 12 and 13.

The base portion 10 is formed such that the base coating 16 extends downward / inward from the long sides of the yard toward the centerline C1 of the yard. The rise of the bottom increases the capacity of the tanks 12, which increases the lifting force of the central part of the docking section where the weight of the vessel rests. A wearable base also means that small amounts of wastewater remain in tanks that are easy to clean.

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The service pipe 17 running in the longitudinal direction of the yard is located in the middle of the base part 10. This service pipe is connected to the step tower 19 at the side edges 11 by at least one transverse pipe 18.

The water level of the lowered dock is marked 20 in the drawing and the water level in the docking situation is marked 21. Thus, the pipes are always accessed from the flock 22 running along the side edges 20 above the water surface 20. In order to facilitate communication with the pipes when the dock is docked, each stair tower 19 has a watertight door 23.

The tube 17 forms a longitudinal reinforcement of the central roll. under the sleepers 24, and some of the bulkheads 24 are positioned to provide support under the side roller sleeper 25.

The pumps 26, which are driven by electric motors 27 located close to them, are located in the central pipe 17 and are easily accessible, such as the associated valves 30, for maintenance and repair in dry rooms. The pumps are connected by means of suction lines 28, 29 to tanks 12 and 13. By means of a central location and suitably arranged valves 30, the total number of pumps can be reduced and the suction lines become relatively short.

It is required that, in use, the dock must be secured in such a way that it is necessary to dredge a pit 31 deep enough to bring the docking deck in the lowered position substantially flush with the bottom of the surrounding dock.

The pump outlets 26 are directed downwards / outwards and strong discharging water streams flush the dock pit from sludge and drifting objects into the dock in each docking situation.

The service pipe has import lines 32 for compressed air, steam, seawater and fresh water, as well as outlet lines that can be connected to the docked vessel through suitable connections on the bottom deck. In this way, loose hoses hanging on the deck are largely avoided and free transport routes along the side edges are obtained.