RU2371543C1 - Method for installation of hydrotechnical structure support unit onto sea bottom - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: method for installation of support unit (1) onto sea bottom, in which support unit (1) is transported on transport barge (2) to the place of its installation, with the help of lifting devices (3), which are symmetrically installed in pontoons (4) on both sides of transport barge (2), taken off transport barge (2), and support unit (1) is lowered to sea bottom in vertical position, differs by the fact that pontoons (4) are rigidly connected to each other by means of cross beams (5) with device (6) for regulation of distance between pontoons (4), at the same time lifting devices (3) are made in the form of stands (7) with hydraulic jacks installed on them (8), base of stands (7) is rigidly installed on pontoons (4), and upper parts of stands (7) are connected to structure of support unit (1) through system of hydraulic jacks (8).

EFFECT: reduced labour intensity, costs and risk level in production of works for installation of support unit of stationary platform onto sea bottom due to application of method for installation of support unit onto sea bottom with the help of floating technical means-pontoons equipped with special weight-lifting systems.

3 cl, 4 dwg

Description

The invention relates to the field of construction of shelf facilities, in particular to the installation of support blocks of hydraulic structures on the seabed.

There is a method according to which the support block of the offshore stationary platform is discharged from transport barges to water on its lateral floating face, which is leak-proof, to create partial buoyancy, and equipped with special pontoons to ensure the required buoyancy, then, using ballasting, the support block is moved from a horizontal position to vertical, sinks and sets on the seabed. Subsequently, special pontoons are disconnected from the support block [1].

This technical solution of the construction method significantly complicates the design of the support block, since to ensure the necessary buoyancy the structural elements are sealed and the support block is equipped with special pontoons. To ensure launching, the support block is equipped with special guide beams and truss bars.

There is also a method of installing the support block on the seabed using a crane vessel, when the crane capacity is sufficient to lift the support block from the transport barge and its subsequent installation on the seabed [2].

A positive feature of this method is that the support block can be transported on a transport barge or pontoons both in a vertical and horizontal position.

However, the known method cannot be used for supporting blocks with a mass exceeding the crane loading capacity and with a crane lifting height lower than the overall height of the supporting block.

The use of crane-erection vessels for this purpose also has the disadvantage of being associated with significant costs due to their high rental value.

Known methods for the construction of hydraulic structures, such as bridges in water places, using special floating equipment in the form of pontoons or ships with a U-shaped hull of the Svanen type, on the transverse crossbar part of which there are two jib cranes with hoisting winches. The vessel enters with a U-shaped opening behind the support column and installs a section on it, forming a bridge span [3]. The vessel can be used to install support blocks of small height on the seabed, which is limited by the height of the jib cranes, the small dimensions of the base of the support block, limited by the width of the aperture of the U-shaped hull.

A known method of installing the support block of a stationary platform on the seabed, in which the support block is transported on a transport barge to the place of its installation, using lifting devices symmetrically located on pontoons on both sides of the transport barge, is removed from the transport barge and the support block is lowered to the seabed in an upright position [4 - prototype].

The use of this method is extremely difficult because of the need to ensure an even distribution of loads on each hoisting winch due to the changing influence of the waves and the changing necessary relative position of both pontoons and the support block.

The present invention is aimed at reducing the complexity, cost and risk when installing the support block of a stationary platform on the seabed by using a new method for installing the support block on the seabed using floating technical means - pontoons equipped with special lifting systems.

This goal is achieved by the fact that a method of installing the support block on the seabed is realized, in which the support block is transported on a transport barge to the place of its installation using lifting devices symmetrically located on pontoons on both sides of the transport barge, removed from the transport barge and lowered to the seabed is a support block in an upright position, and the pontoons are rigidly connected to each other by transverse beams with a device for adjusting the opening size between the pontoons, while the lifting devices perform They are mounted in the form of uprights with hydraulic jacks located on them, the base of the uprights is rigidly mounted on the pontoons, and the upper parts of the uprights are connected to the support block structure through a system of hydraulic jacks.

In addition, each of the drive mechanisms of the lifting devices is in the form of a hydraulic jack, the cylinder body (9) and the rod (10) of which the fixing elements (11) alternately carry out a rigid connection with the rod (12) provided with protrusions (13) connected by a corresponding hinge ( 14) with a support block (1), the free end of the rod (12) is located in the inner cavity of the hydraulic jack housing (8) of the lifting device (3), the supply of working fluid is provided simultaneously to the cylinders (9), while ensuring uniform distribution of loads from ENA reference block (1) and the wave impacts on each lifting device (3) according to a predetermined program.

In one embodiment of the method, the transport barge is made in the form of a U-shaped transport vessel with the possibility of changing the magnitude of the opening between the longitudinal parts of the vessel.

Technological schemes of construction and means for implementing the method of installing the support block on the seabed are presented in the drawings (see figures 1-4).

Figure 1 shows the relative position of the support block on a transport barge and pontoons with racks to which the support block is sprinkled.

Figure 2 is the same, top view.

Figure 3 - design of the rack frame structure with a hydraulic lift and a building site (hinged) to the support block.

Figure 4 is a schematic sequence of lifting operations using a hydraulic lifting device. On figa shows the position of the rigid connection of the rod of the jack with the rod, on figb - rigid connection of the cylinder body with the rod.

Means for implementing the method include (Fig. 1 and Fig. 2) a support block 1, a transport barge 2, lifting devices 3 mounted on pontoons 4.

Pontoons 4 are interconnected by transverse beams 5 with control devices 6 of the opening between them. Each lifting device 3 is made in the form of racks 7 with hydraulic jacks 8.

The hydraulic jack 8 (Fig. 3 and Fig. 4) comprises a housing 9, a hollow rod 10, inside of which a rod 12 with protrusions 13 is located. The housing 9 and the hollow rod 10 have the possibility of rigid connection with the rod 12 using the fixing elements 11. The rod 12 is one the end by means of a hinge 14 is connected with the support block 1, and the free end of the rod 12 is located inside the hollow rod 10 of the hydraulic jack 8.

The proposed method is implemented as follows.

The support block 1 is transported on a transport barge 2 to the place of its installation (figure 1 and figure 2). Using lifting devices 3, symmetrically located on the pontoons 4 on both sides of the transport barge 2, remove from the transport barge 2 and lower the support block 1 in a vertical position on the seabed. Pontoons 4 are rigidly interconnected by transverse beams 5 with an adjustment device 6 of the opening between the pontoons 4. Lifting devices 3 are made in the form of uprights 7 with hydraulic jacks located on them 8. The base of the uprights 7 is rigidly mounted on the pontoons 4, and the upper parts of the uprights 7 are connected with the construction of the support block 1 through a system of hydraulic jacks 8.

Using hydraulic lifting devices 3, the support block 1 is lifted from the transport barge 2 and the transport barge 2 is withdrawn from under the support block 1 until it completely leaves the opening between the pontoons 4.

After the transfer of the transport barge 2 from the opening between the pontoons 4, a descent is carried out using hydraulic lifting devices 3 and the support block 1 is installed on the seabed.

Each of the drive mechanisms of the lifting devices 3 (Fig. 3 and Fig. 4) is made in the form of a hydraulic jack 8, the cylinder body 9 and the rod 10 of which are fixed elements 11 alternately tightly couple with the rod 12 provided with protrusions 13 connected by a corresponding hinge (eye) 14 with the support block 1. The free end of the rod 12 is located in the inner cavity of the housing of the hydraulic jack 8 of the lifting device 3, the supply of the working fluid is provided simultaneously in the cylinders 9. At the same time, the load distribution from CA support block 1 and the wave effects on each lifting device 3 in accordance with a given program.

In one embodiment of the method, the transport barge is made in the form of a U-shaped transport vessel with the possibility of changing the magnitude of the opening between the longitudinal parts of the vessel.

The installation procedure of the support block 1 on the seabed using a special U-shaped vessel is the same as in the case of the use of pontoons.

The present invention allows to reduce the complexity, reduce costs and the level of risk when performing work on installing the support block of a stationary platform on the seabed by using this method to install the support block on the seabed using floating technical means - pontoons equipped with special lifting systems.

Literature

1. G.V.Simakov and others. Marine hydraulic structures on the continental shelf. L .: "Shipbuilding", 1989.

2. Dawson T. Design of offshore facilities. Translation from English - L .: "Shipbuilding", 1986.

3. The lifting vessel "Svanen", with a carrying capacity of 6500 tons.

4. GB Patent GB No. 2174745, CL EBB 17/00, 1986.

Claims (3)

1. The method of installing the support block on the seabed, in which the support block is transported on a transport barge to the place of its installation using lifting devices symmetrically located on pontoons on both sides of the transport barge, removed from the transport barge and lower the support block in the vertical position, characterized in that the pontoons are rigidly interconnected by transverse beams with a device for adjusting the opening between the pontoons, while the lifting devices are made in the form of racks with located on them with hydraulic jacks, the base of the uprights is rigidly mounted on the pontoons, and the upper parts of the uprights are connected to the structure of the support block through a system of hydraulic jacks. 2. The method according to claim 1, characterized in that each of the drive mechanisms of the lifting devices is in the form of a hydraulic jack, the cylinder body and the rod of which fixing elements alternately carry out rigid connection with a rod equipped with protrusions connected by a corresponding hinge to the support block, the free end of the rod placed in the inner cavity of the hydraulic jack of the lifting device, the supply of the working fluid is provided simultaneously in the cylinders, while ensuring uniform distribution of loads from and reference block and the wave impacts on each lifting device in accordance with a predetermined program. 3. The method according to claim 1 or 2, characterized in that the transport barge is made in the form of a U-shaped transport vessel with the possibility of changing the magnitude of the opening between the longitudinal parts of the vessel.

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