JPH0840357A - Pressure connection part for connecting pressure duct on ship to float duct - Google Patents

Abstract

PURPOSE: To provide a pressure connecting part for connecting a pressure duct on a ship to a floating duct, capable of eliminating conventional difficulties and including at least one bending part. CONSTITUTION: A floating duct 3 is connected to one end of a cable 19, and the other end of the cable 19 is directly or indirectly connected to a ship 1 under the presence of spring mechanisms 23 and 24 for preventing the application of an excessive load on the bending parts 10 and 13 of a pressure connecting part 9 during relative motion between the ship 1 and the floating duct 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure connection for connecting a pressure duct on a ship to a floating duct which includes at least one flexure.

[0002]

2. Description of the Prior Art Such pressure connections are used, for example, to feed sand from a stationary piston to a floating duct which extends to the place where the sand is to be deposited.

To date, stationary pistons could only be used at wave heights below 2-3 m. In the case of higher waves, the flexures, which consist essentially of rubber, are too violently loaded.

The force acting on the pressure connection existing between the piston and the floating duct has a static component and a dynamic component. Static components result from displacement of the ship due to water flow, wind, and waves. The dynamic component results from the various movements that the ship and the floating duct make relative to each other due to the flexibility of the connections and the mass of the various components.

[0005]

The newly developed stationary piston operates even at wave heights of 4-5 m.
In that case, the forces that can be exerted on the pressure connection due to the reasons mentioned above can be significantly increased. This poses a great risk of collapsing the pressure connection, especially its flexure, since this is the weakest component in the overall system. The strength of the flexures of the pressure connection cannot be increased indefinitely, since the pressure connection must also be sufficiently flexible under clearly unfavorable circumstances, such as in the case of high waves.

[0006]

The object of the present invention is to eliminate this drawback, for which purpose a floating duct is connected to one end of a cable, the other end of which is connected to the ship and Provision is made for direct or indirect connection to the ship with the interposition of a spring mechanism which prevents overloading the flexures of the pressure connection during relative movement with the floating duct.

By guiding the cable through the spring mechanism, it is possible to prevent the cable from being subjected to a large impact load. The displacement of the floating duct with respect to the ship is gradually adapted.

In particular, the spring mechanism includes a hydraulic cylinder, which is connected to the cable such that the piston rod is pushed into the cylinder as the load on the cable increases. In the hydraulic cylinder, the hydraulic medium therein is kept pressurized by the compressed gas medium.

In order to optimally use the possible stroke of the hydraulic cylinder, the cable is mounted on the piston rod near the cylinder as well as a cable pulley mounted on the piston rod of the hydraulic cylinder. Provisions are made to span across a cable pulley that is located a great distance from the cable pulley.

Therefore, the difference in working length of the cable is twice as large as the displacement of the piston rod.

In order to keep the space occupied by the hydraulic cylinders on board the ship as small as possible, it is preferably provided that the hydraulic cylinders are arranged substantially perpendicular to the deck of the ship. Thereby, it is likewise easy to fix the hydraulic cylinder to the hull of the ship.

[0012]

The invention is further explained by means of the embodiments schematically shown in the drawings.

FIG. 1 shows a part of a floating dredger 1, on which a pressure duct 2 is placed, through which, for example, a sand-water mixture is transported to a floating duct 3.

The pressure duct 2 is provided at its curved end 4 with a flexure 5 terminating in a joint 6. Between the pressure duct 2 and the bent end 4 there is mounted a rotating bush, not shown further in relation to the lateral flexibility. The angle enclosed by the axis and the vertical of the joint part 6 can be adjusted by the hydraulic cylinder 7.

A suitable joint part 8 of the pressure connection 9 can be connected to the joint part 6. The pressure connection 9 further comprises a main flexible tube section 10 connected to the coupling section 8 and provided with a floating member 11. As a result, even if the joint part 8 is moved away from the joint part 6, the pipe part 10 with the joint part 8 does not sink towards the bottom of the water, especially because of the weight of the joint part 8. Furthermore, the pressure connection 9 is connected on one side to the pipe section 10 and on the other side the flexible pipe section 1
3, which includes a flexible tube section 12 which is connected to a bent tube 14 of the floating duct 3.

In achieving the connection between the pressure connection 9 and the pressure duct 2 on the ship 1, the hydraulic cylinder 7 positions the axis of the coupling part 6 in a substantially vertical direction and thus towards a winch not shown further. Through the cable 15 extending over, the pipe section 10 can be pulled up in a substantially vertical direction in order to fit the joint section 8 connected thereto into the joint section 6, so that these joint sections are relative to each other. Locked. The hydraulic cylinder 7 can then be depressurized, so that the coupling part 6 can assume the desired position. In order to prevent excessive tensile loads on the flexures 5 and 13, tension receivers 16 can be attached along them in another known manner.

In order to prevent overloading of the pressure connection 9,
The part 17 of the floating duct 3 is provided with a member 18 to which one end of a cable 19 can be connected. The other end of the cable 19 is connected to a member 20 fixed to the ship 1. The member 20 can also be provided by a winch fixedly attached to the ship so that the cable 19 can be of any desired length. The cable 19 includes two cable pulleys 21 and a hydraulic cylinder 24 rotatably connected to the ship 1.
It is stretched across the cable pulley 22 attached to the piston rod 23 of. In addition, the cable 19
Is stretched across two cable pulleys 25 rotatably mounted on a pillar 26 extending obliquely upward and outward from the ship 1.

A piston (not shown) of the hydraulic cylinder 24 is pushing the hydraulic medium. The hydraulic cylinder 24 is used for the container 2
It is in communication via a duct 27 with a container 28 in which a membrane 29 for separating the liquid medium from the compressed gas medium in the other part of 8 is placed. Nitrogen is used in particular as the gaseous medium. Instead of a membrane, a cylinder whose piston can move freely can also be used. In that case, the piston separates the hydraulic medium from the gaseous medium.

When the water is stationary, the ship 1 and the floating duct 3 assume a position relative to the water level 30 as shown in FIG. As waves, wind forces, etc. occur, ships and floating ducts move relative to each other in both vertical and horizontal directions. The dash-dotted line shows the course of the pressure connection under different circumstances. At that time, the cable 19 is connected to the pressure connecting portion 9
Is pulled completely tight and as a result its flexure 1
It constantly prevents a large load from being applied to 2. As the distance between the ship 1 and the floating duct 3 increases, the piston rod 23 is pushed deeper into the hydraulic cylinder 24, but the pressure exerted on the hydraulic medium by the gaseous medium in the container 28 increases only slightly. Therefore, the force generated between the ship 1 and the floating duct 3 never exceeds a certain limit value.

Only one possible implementation of the device according to the invention is shown in FIG. 1 and described above,
And it is obvious that numerous modifications can be made without departing from the idea of the invention.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing an embodiment of the present invention.

[Explanation of symbols]

 1 Ship 2 Pressure Duct 3 Floating Duct 9 Pressure Connection 10 Main Flexible Pipe Part 13 Flexible Pipe Part 19 Cable 21 Cable Pulley 22 Cable Pulley 23 Piston Rod 24 Hydraulic Cylinder

Claims (4)

[Claims] 1. A pressure connection for connecting a pressure duct (2) on a ship (1) to a floating duct (3), said pressure connection (9) being at least one flexure (10,1).
3) in which the floating duct (3) is included.
Is connected to one end of a cable (19), the other end of which is connected to the flexure () of the pressure connection (9) during relative movement between the ship (1) and the floating duct (3). A pressure connection, characterized in that it is connected directly or indirectly to the ship (1) with the interposition of a spring mechanism (23, 24) which prevents an excessive load from being applied to (10, 13). 2. The pressure connection part according to claim 1, wherein
The spring mechanism includes a hydraulic cylinder (24) which is connected to the cable (19) so that the piston rod (23) is pushed into the cylinder as the load on the cable (19) increases. In the hydraulic cylinder (24), the hydraulic medium therein is kept pressurized by the compressed gas medium. 3. The pressure connection part according to claim 2,
The connecting cable (19) is connected to the hydraulic cylinder (24).
A cable pulley (22) mounted on said piston rod (23) as well as a substantial distance from said cable pulley (22) mounted on said piston rod (23) near said cylinder (24) Pressure connection characterized in that it is stretched across the cable pulley (21). 4. Pressure connection according to claim 2 or 3, characterized in that the hydraulic cylinder (24) is arranged substantially perpendicular to the deck of the ship (1). Connection part.