Mooring device of offshore concrete gravity type LNG receiving platform

Abstract

The utility model discloses a berthing device of an offshore concrete gravity type LNG receiving platform. The berthing device at least comprises a set of berthing supporting units which are longitudinally connected to the upper portion of the outer side face of an east wall or a west wall of an LNG storage tank at intervals. A plurality of pairs of vertical sliding grooves are longitudinally embedded in the upper portion of the outer side face of the east wall or the west wall at intervals. Each berthing supporting unit comprises a supporting column, a rubber fender and a buoyancy tank; the supporting column comprises a pair of root vertical rods, a main rod, four layers of connecting supporting rods and an end structure. The inner ends of the pair of root vertical rods are embedded in the pair of vertical sliding grooves in a sliding mode respectively. The main rods comprise an upper main rod and a lower main rod which are connected to the upper ends and the lower ends of the vertical rods in a one-to-one correspondence manner; the four layers of connecting support rods are connected between the upper main rod and the lower main rod at intervals; four corners of the end structure are connected to the ends of the upper main rod and the lower main rod in a one-to-one correspondence manner; the rubber fender is installed on the outer end face of the end structure. The buoyancy tank is fixed to the inner bottom of the supporting column. The structure safety of the platform can be guaranteed when a ship is berthed.

Description

TECHNICAL FIELD

[0001] The utility model relates to a berthing device of offshore concrete gravity type LNG receiving platform. BACKGROUND

[0002] In recent years, due to the increasing demand for clean energy natural gas, the liquefied natural gas (LNG) industry has developed rapidly. Due to the enhancement of environmental protection consciousness, the construction of a concrete gravity type receiving station on the sea for the production, storage, unloading and the like of LNG has become a reliable way. The offshore LNG receiving station is used for the production, storage and unloading of liquefied natural gas (LNG) and stable condensate oil (SGC). The offshore LNG receiving station mainly comprises a floating receiving station and a fixed receiving station, and most of the fixed receiving stations are of a gravity type structure, the foundation of which is built on the shore and then towed to the installation site, and the gravity type structure is made to sink to the seabed by ballast. The super large concrete gravity type platform not only has a large volume and a large weight, but also has a large weight of the upper module. In order to meet the floating requirement and reduce the foundation stress after installation, one ballast adjusting cabin is added to each side of the platform, and therefore the cross section of the platform is in the shape of a "convex" character. The protruding ballast adjusting cabins on both sides of the platform will affect the berthing safety of LNG ships and condensate oil tankers, and the bottom of the ship will collide with the protruding ballast adjusting cabins of the platform, and therefore a berthing support device with a safe and reliable structure needs to be used. SUMMARY

[0003] The utility model aims at overcoming the defects of the prior art and providing a berthing device of offshore concrete gravity type LNG receiving platform, which can safely avoid the ballast adjusting cabins on both sides of the LNG storage tank when the ship is berthing, and ensure the structural safety of the platform when the ship is berthing.

[0004] The utility model aims at overcoming the defects of the prior art and providing a berthing device of offshore concrete gravity type LNG receiving platform, which can safely avoid the ballast adjusting cabins on both sides of the LNG storage tank when the ship is berthing, and ensure the structural safety of the platform when the ship is berthing.

[0005] The upper part of the outer side of the east wall or the upper part of the outer side of the west wall is longitudinally spaced and pre-buried with a plurality of pairs of vertical sliding grooves;

[0006] Each of the berthing support units includes a support column, a rubber fender and a pontoon; the support column is a hollow truss structure, and the outer contour of the support column is a quadrangular pyramid whose lying length is greater than the length of the ballast regulating tank; the support column includes a pair of root vertical rods, a main rod, four layers of connecting struts and an end structure; wherein the inner ends of the pair of root vertical rods are slidably embedded in a pair of vertical slide grooves in a one-to-one correspondence; the main rod includes two lower main rods connected to the lower ends of the pair of vertical rods in a one-to-one correspondence and two upper main rods connected to the upper ends of the pair of vertical rods in a one-to-one correspondence, and the two lower main rods are horizontally The vertical spacing between the two lower main rods gradually decreases from the root to the end; the vertical spacing between the two upper main rods gradually decreases from the root to the end in a one-to-one correspondence with the two lower main rods, and the vertical spacing between the two upper main rods also gradually decreases from the root to the end; four layers of connecting struts are connected between the two lower main rods and the two upper main rods at intervals, and each layer of connecting struts includes two vertical struts, an upper longitudinal strut, and a lower longitudinal strut; the end structure is in the shape of a Chinese character "目", and the four corners of the end structure are connected to the ends of the two lower main rods and the ends of the two upper main rods in a one-to-one correspondence;

[0007] The rubber fender is installed on the outer end surface of the end structure of the support column;

[0008] The buoyancy box is fixed to the inner bottom of the support column.

[0009] The above-mentioned berthing device of the offshore concrete gravity LNG receiving platform, wherein the root vertical rod is made of I-beam, and the cross-section of the vertical slide is a lying T-shape; the inner end wing plate of the root vertical rod is embedded in the vertical slide, and a sliding-aiding ball is provided between the bottom of the vertical slide and the inner end wing plate of the root vertical rod.

[0010] In the above-mentioned berthing device for the offshore concrete gravity LNG receiving platform, each layer of connecting struts of the support columns further includes two vertical diagonal struts, an upper longitudinal diagonal strut and a lower longitudinal diagonal strut.

[0011] The berthing device of the offshore concrete gravity LNG receiving platform of the utility model has the following features:

[0012] 1) The use of cantilever support columns allows ships to safely avoid the ballast control tanks on both sides of the LNG storage tanks when berthing, ensuring the structural safety of the ultra-large concrete gravity platform when the ship is berthing;

[0013] 2) By setting up a buoyancy box in the space of the support column, the support column can adapt to the water level change and float up and down along a pair of vertical chutes, making it convenient for ships to berth. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1a This is a longitudinal section of an offshore concrete gravity LNG receiving platform;

[0015] Figure 1b This is a plan view of an offshore concrete gravity LNG receiving platform;

[0016] Figure 2 This is a side view of the berthing device of the offshore concrete gravity LNG receiving platform of the present invention;

[0017] Figure 3 It is a side view of the support column in the docking device of the present invention;

[0018] Figure 4 yes Figure 2 Left side view;

[0019] Figure 5 This is a cross-sectional view of the connection structure between the vertical rod at the base of the support column in the berthing device of the present invention and the vertical chute pre-buried on the outer side surface of the east wall or the outer side surface of the west wall of the LNG storage tank;

[0020] Figure 6 This is a reinforcement diagram of the vertical chute in the berthing device of the present invention. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] See also Figure 1a and Figure 1b The berthing device of the offshore concrete gravity LNG receiving platform of the present invention is targeted at an LNG receiving platform including a hexahedral LNG storage tank 100 consisting of a top plate 11, a bottom plate 12, an east wall 13, a west wall 14, a south wall 15 and a north wall 16. A ballast regulating cabin 17 with the same height and lower than the height of the LNG storage tank 100 is respectively extended from the outer lower part of the east wall 13 and the outer lower part of the west wall 14.

[0023] See also Figures 2 to 6 The utility model of the offshore concrete gravity LNG receiving berthing device comprises at least one set of longitudinally spaced berthing support units connected to the upper outer surface of the east wall 13 or the upper outer surface of the west wall 14 of the LNG storage tank 100.

[0024] A plurality of pairs of vertical chutes 10 are pre-buried at longitudinal intervals on the upper portion of the outer surface of the east wall 13 or the upper portion of the outer surface of the west wall 14; the cross section of each vertical chute 10 is in a lying T-shape.

[0025] Each berthing support unit includes a support column 2, a rubber fender 3 and a pontoon 4; the support column 2 is a hollow truss structure, and the outer contour of the support column 2 is a quadrangular pyramid whose lying length is greater than the length of the ballast regulating tank 17; the support column 2 includes a pair of root vertical rods 20, a main rod, four layers of connecting struts and an end structure 28; wherein the root vertical rod 20 is made of I-steel, and the inner end wing plates of a pair of root vertical rods 20 are slidably embedded in a pair of vertical slide grooves 10 in a one-to-one manner, and a sliding ball 10A is provided between the bottom of each vertical slide groove 10 and the inner end wing plate of the vertical rod 20; the main rod is made of steel pipe and includes two lower main rods 21 connected to the lower ends of the pair of vertical rods 20 in a one-to-one manner and two upper main rods 22 connected to the upper ends of the pair of vertical rods 20 in a one-to-one manner, and the two lower main rods 21 are horizontally The vertical spacing between the two lower main bars 21 gradually decreases from the base to the end. The vertical spacing between the two upper main bars 22 gradually decreases from the base to the end. The vertical spacing between the two upper main bars 22 also gradually decreases from the base to the end. The connecting struts are also made of steel pipes. Four layers of connecting struts are spaced between the two lower main bars 21 and the two upper main bars 22. Each layer of connecting struts includes two vertical struts 23, an upper longitudinal strut 24, a lower longitudinal strut 25, two vertical diagonal struts 26, an upper longitudinal diagonal strut 27, and a lower longitudinal diagonal strut 28. The end structure 29 is made of I-beam and is in the shape of a mesh. The four corners of the end structure 29 are connected to the ends of the two lower main bars 21 and the ends of the two upper main bars 22 in a one-to-one correspondence. Bolt holes for mounting the rubber fender 3 are provided on the outer end surface of the end structure 29.

[0026] The rubber fender 3 is mounted on the outer end surface of the end structure 29 of the support column 2 by bolts; the entire length of the berthing support unit is equal to the length of the ballast regulating tank 17 plus the safety distance L from the ship 200 to the outer wall of the ballast regulating tank 17.

[0027] The buoyancy tank 4 is fixed to the inner bottom of the support column 2 .

[0028] The berthing device of the offshore concrete gravity-type LNG receiving platform of the present invention can also be provided with a set of berthing support units outside the east wall 13 and the west wall 14 of the LNG storage tank 100, so as to facilitate the berthing of ships at any location. Each berthing support unit adopts a cantilever support column 2, which allows the ship to safely avoid the ballast regulating tank 17 on both sides of the LNG storage tank 100 when berthing the platform; at the same time, the support column 2 can slide up and down along a pair of vertical slides 10, so that the support column 2 can adapt to changes in water level; in addition, the buoyancy box in the space between the support column 2 can increase the floating function of the support column 2. The back of the vertical slide 10 is connected with several rows of steel bars 10B at intervals along the height direction, so that it can withstand the tensile stress caused by the deadweight of the support column 2.

[0029] For example, the LNG storage tank 100 in an offshore concrete gravity LNG receiving platform is 300 meters long, 150 meters wide, and 30 meters high. The ballast regulating tank 17 is 13.5 meters high. The support column 2 is 24 meters long, with the base dimensions of 8 meters long × 9.7 meters high. The end dimensions of 2.58 meters long × 7.64 meters high are measured. The main mast is made of steel pipe with an outer diameter of 609.6 mm, and the connecting strut is made of steel pipe with an outer diameter of 355.6 mm. The pontoon 4 is made of 10 mm thick steel plate with a length of 23 meters long × height of 2 meters high. The vertical chute 10 is made of 30 mm thick steel plate. The rubber fender 3 is SCN2000.

[0030] The above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Those skilled in the art may make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also fall within the scope of the present invention and should be defined by the claims.

Claims

1. A berthing device for an offshore concrete gravity LNG receiving platform. The LNG receiving platform in question includes a hexahedral LNG storage tank composed of a top plate, a bottom plate, an east wall, a west wall, a south wall, and a north wall. At the lower part of the outer side of the east wall and the lower part of the outer side of the west wall, there extends a ballast adjustment tank with the same height and lower than the height of the LNG storage tank. The berthing device at least includes a set of berthing support units longitudinally spaced and connected to the upper part of the outer side of the east wall or the upper part of the outer side of the west wall of the LNG storage tank. It is characterized in that, On the upper part of the outer side of the east wall or the upper part of the outer side of the west wall, a plurality of pairs of vertical chutes are pre-embedded at intervals longitudinally. Each of the berthing support units includes a support column, a rubber fender, and a floating box. The support column is of a hollow truss structure, and the outer contour of the support column is an inverted frustum of a square pyramid with a length greater than the length of the ballast adjustment tank. The support column includes a pair of root vertical rods, main rods, four layers of connecting braces, and an end structure. Among them, the inner ends of the pair of root vertical rods are slidably embedded in a pair of vertical chutes correspondingly; the main rods include two lower main rods correspondingly connected to the lower ends of the pair of vertical rods and two upper main rods correspondingly connected to the upper ends of the pair of vertical rods. The two lower main rods are horizontally arranged, and the longitudinal distance between the two lower main rods gradually decreases from the root to the end; the vertical distance between the two upper main rods and the two lower main rods gradually decreases from the root to the end, and the longitudinal distance between the two upper main rods also gradually decreases from the root to the end; the four layers of connecting braces are spaced and connected between the two lower main rods and the two upper main rods. Each layer of connecting braces includes two vertical braces, an upper longitudinal brace, and a lower longitudinal brace; the end structure is in the shape of a square frame, and the four corners of the end structure are connected to the ends of the two lower main rods and the ends of the two upper main rods correspondingly. The rubber fender is installed on the outer end face of the end structure of the support column. The floating box is fixed to the inner bottom of the support column.

2. The berthing device for an offshore concrete gravity LNG receiving platform according to claim 1, characterized in that: The root vertical rods are made of I-beams, and the cross-section of the vertical chute is an inverted T-shape; the inner end wing plates of the root vertical rods are embedded in the vertical chutes, and there are auxiliary sliding balls between the bottom of the vertical chutes and the inner end wing plates of the root vertical rods.

3. The berthing device for an offshore concrete gravity LNG receiving platform according to claim 1, characterized in that: Each layer of connecting braces of the support column also includes two vertical diagonal braces, an upper longitudinal diagonal brace, and a lower longitudinal diagonal brace.

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