CN105083486A - Temporary fixing device and construction method thereof - Google Patents

Abstract

The temporary fixing device and its construction method provided by the present invention are used between the upper floating tank and the lower floating tank in the wet towing transportation of the new semi-submersible oil production platform, and have such characteristics, including: several base structures, arranged on the lower floating tank above the top deck of the pontoon; the latch structure corresponds to the base structure one by one, and is arranged under the bottom deck of the floating tank and above the base structure; the lower internal thread member is fixed on the side of the base structure; the upper internal thread member is fixed on the side of the base structure. On the side of the floating tank, directly above the lower internally threaded member; and stud bolts, the two ends of which are fixedly connected to the lower internally threaded member and the upper internally threaded member respectively, wherein the base structure has an opening in the center, and the latch structure is inserted in the hole.

Description

Temporary fixture and construction method thereof

technical field

The invention relates to a fixing device and a construction method, in particular to a temporary fixing device and a construction method applied between double pontoons in the wet towing transportation of a new semi-submersible oil production platform.

Background technique

After the semi-submersible oil production platform is built in the shipyard, it needs to be transported to the operating sea area. Generally, there are two methods: for short-distance transportation, it can be directly towed by a tugboat to the operating sea area, that is, wet towing; for medium and long-distance transportation, first It is transported by transport ship to a shelter with shallow water depth near the operating sea area (that is, dry towing), and then wet towed by a tugboat to the operating sea area. It can be seen that no matter which method is used, wet mopping is an essential process. For a conventional semi-submersible platform, its hull structure includes columns, pontoons and cross braces. These structures have been closed during the construction stage of the shipyard, and the hull structure forms a whole, which can be towed out as a whole. In recent years, based on new engineering requirements, domestic and foreign companies have proposed a series of new semi-submersible platform concepts, which generally add auxiliary structures under the conventional semi-submersible platform pontoons, such as heave plates, trusses, and second-floor pontoons. In order to reduce the wave load, the draft of these auxiliary structures is relatively deep, and subject to the limitation of the draft of the shipyard wharf (generally no more than 14 meters), these auxiliary structures cannot be welded with the main hull at the factory, and need to be installed at sea.

Taking the unconditionally stable self-contained deep-draft floating oil production platform as an example, the central annular buoyancy tank (i.e., the upper buoyancy tank), the small cross-section column, and the bottom annular ballast tank (i.e., the lower buoyancy tank) were not separated during the construction and towing phases. Closed together, it needs to be assembled at sea. When the platform is wet towed, the upper pontoon will be placed above the lower pontoon. After arriving at the working position, connect the two together in a certain way. In order to reduce welding, painting and other construction operations at sea as much as possible, it is necessary to adopt a temporary fixing structure between the upper pontoon and the lower pontoon to control the relative movement of the two during the towage process and reduce the damage of the coating material caused by the collision , and even structural damage. On the other hand, due to the limited offshore construction window, the temporary fixings adopted should be as easy as possible to disassemble.

Contents of the invention

The present invention is carried out in order to solve the above problems, and the purpose is to provide a temporary fixing device and a construction method that can be adapted to different scales and shapes of buoyant tank connections, has high structural safety and reliability, low cost, and is convenient for offshore construction.

The temporary fixing device and its construction method provided by the present invention are used between the upper floating tank and the lower floating tank in the wet towing transportation of the new semi-submersible oil production platform, and have such characteristics, including: several base structures, arranged on the lower floating tank above the top deck of the pontoon; the latch structure corresponds to the base structure one by one, and is arranged under the bottom deck of the floating tank and above the base structure; the lower internal thread member is fixed on the side of the base structure; the upper internal thread member is fixed on the side of the base structure. On the side of the floating tank, directly above the lower internally threaded member; and stud bolts, the two ends of which are fixedly connected to the lower internally threaded member and the upper internally threaded member respectively, wherein the base structure has an opening in the center, and the latch structure is inserted in the hole.

The temporary fixing device and its construction method provided by the present invention also have the feature that the size of the opening is larger than the size of the bolt structure.

The temporary fixing device and the construction method thereof provided by the present invention also have such a feature: wherein, the shape of the opening can be a square hole, a round hole, or an ellipse.

The temporary fixing device and its construction method provided by the present invention also have the feature that the stud bolts can be freely expanded and contracted according to the distance between the upper floating box and the lower floating box.

The present invention also provides a construction method for a temporary fixing device, which is used between the upper buoyancy tank and the lower buoyancy tank in the wet towing transportation of the new semi-submersible oil production platform. Installing; and step B, removing the fixing device after it is put in place at sea, wherein, step A includes: step A1, arranging the base structure in place and welding the lower pontoon as a whole, and arranging on the top deck of the lower pontoon Certain supporting piers; step A2, hoist the upper buoyant tank above the lower buoyant tank by a crane, and insert the pin structure into the opening of the base structure by pulling the guide cable; step A3, connect one end of the stud bolt with the inner The threaded member is connected; and step A4, the upper internal threaded member is connected with the other end of the stud bolt, and the upper internal threaded member is welded on the outer plate side of the floating tank, step B, has: step B1, utilizes part The mooring system temporarily locates the new semi-submersible oil production platform, and controls the movement of the new semi-submersible oil production platform; step B2, pulls the buoy box through the deck winch or other equipment, controls its movement, and prepares for the removal of the temporary fixing device; step B3 , using an underwater robot to cut the connection between the stud bolt and the upper internal threaded member, and partially grind it; and step B4, complete the demolition operation, and continue other offshore construction.

The construction method of the temporary fixing device provided by the present invention also has such characteristics: wherein, several base structures are arranged above the top deck of the lower pontoon; Below the bottom deck, above the base structure; the lower internally threaded member, secured to the side of the base structure; the upper internally threaded member, secured to the side of the pontoon, directly above the lower internally threaded member; and studs, at both ends They are respectively fixedly connected with the lower internally threaded member and the upper internally threaded member, wherein the base structure has an opening in the center, and the latch structure is inserted into the opening.

The construction method of the temporary fixing device provided by the present invention also has the feature that the size of the opening is larger than the size of the bolt structure.

The construction method of the temporary fixing device provided by the present invention also has such a feature: wherein, the shape of the opening can be a square hole, a round hole, or an ellipse.

The construction method of the temporary fixing device provided by the present invention also has the feature that the stud bolts can freely expand and contract according to the distance between the upper floating box and the lower floating box.

Invention function and effect

According to the temporary fixing device and its construction method involved in the present invention, the combination of traditional welding and mechanical mechanism connection mode is adopted, which has high technical maturity and low cost; The connection between one side of the bolt and the platform requires less underwater operations, and the operations are all on the outside of the floating body, which has high safety; 3. The present invention realizes the purpose of connecting the upper and lower floating tanks into one body through a simple mechanism. , The relative movement between the lower buoyancy tanks is restrained and restrained, which ensures the safety of transportation. 4. The scope of application of the present invention is not limited by factors such as the shape, size, and quantity of the floating tank, and the application scope is wide. In summary, the present invention has the advantages of adapting to the connection of buoyant tanks of different sizes and shapes, high structural safety and reliability, low cost, and simple offshore construction, and can be widely used in the needs of new semi-submersible oil production platforms. A type of platform that temporarily fixes multiple buoys during sea towage.

Description of drawings

Fig. 1 is the front view of the temporary fixing device of the present invention in the embodiment;

Fig. 2 is the top view of the A-A section of the present invention in an embodiment;

Fig. 3 is the schematic diagram of the arrangement of the base structure of the present invention on the lower deck of the pontoon tank in the embodiment; and

Fig. 4 is a schematic diagram of the construction position of the present invention on the "unconditionally stable self-contained deep-draft floating oil production platform" in the embodiment.

Detailed ways

The temporary fixing device and its construction method involved in the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

Example

Fig. 1 is a front view of a temporary fixing device in an embodiment of the present invention.

Fig. 2 is a top view of the A-A section of the present invention in an embodiment.

Fig. 3 is a schematic diagram of the arrangement of the foundation structure of the present invention on the top deck of the lower pontoon tank in the embodiment.

As shown in FIG. 1 , FIG. 2 and FIG. 3 , the temporary fixing device has: a base structure 1 , a latch structure 2 , a lower internally threaded member 3 , an upper internally threaded member 4 and a stud bolt 5 .

The temporary fixing device is used between the upper buoyancy tank 7 and the lower buoyancy tank 6 in the wet towing transportation of the new semi-submersible oil production platform.

Several base structures 1 have openings 1-1 in the center respectively. The base structure 1 is arranged at the outer edge of the top deck of the lower pontoon tank 6, and is located on a strong member or a strong frame, and the deck is partially reinforced, and multiple base structures 1 can be arranged to interact with the top deck of the lower pontoon tank 6. welded together.

The size of the opening 1-1 is larger than the size of the latch structure 2, and there is a certain gap after the latch structure 2 is inserted into the opening 1-1 to ensure redundant installation. The shape of the opening 1-1 can be a square hole, a round hole, an ellipse, etc., which are easy to manufacture.

The bolt structure 2 corresponds to the base structure 1 one by one, and the number is the same as that of the base structure 1. It is arranged on the bottom deck of the floating tank 7, and the local reinforcement under the deck should be arranged at the top deck strength member of the floating tank 7 as much as possible. The top of the base structure 1 is inserted into the opening 1-1.

The lower internal thread member 3 is pre-welded on the side of each base structure 1 and is located outside the lower buoyancy tank 6 .

The upper internal thread member 4 is installed on the outer plate side of the floating tank 7, just above the lower internal thread member 3.

The number of the lower internally threaded member 3 is consistent with that of the upper internally threaded member 4, and their shapes are similar.

The two ends of the stud bolt 5 are fixedly connected with the lower internal thread member 3 and the upper internal thread member 4 respectively, and are used to connect the lower internal thread member 3 and the upper internal thread member 4, and its size is the same as that of the upper floating tank 7 and the lower floating tank 6 spacing and The dimensions of the lower internally threaded member 3 and the upper internally threaded member 4 match.

The stud bolt 5 can freely expand and contract according to the distance between the upper floating box 7 and the lower floating box 6 .

Fig. 4 is a schematic diagram of the construction position of the present invention on the "unconditionally stable self-contained deep-draft floating oil production platform" in the embodiment.

As shown in Figure 4, the dotted circle in the figure is the construction location of the present invention.

The temporary fixture construction method has the following steps:

Step A: Install the fixing device 1 in the shipyard.

Step A includes the following steps:

Step A1: Arrange the base structure 1 in place, weld it together with the lower buoyancy tank 6, and arrange a certain supporting pier on the top deck of the lower buoyancy tank 6, and proceed to step A2.

Step A2: Hoist the upper buoyancy tank 7 above the lower buoyancy tank 6 by a crane, and ensure that the plug structure 2 is inserted into the opening 1-1 of the base structure 1 by means of traction by a guide cable, and enter step A3.

Step A3: Connect one end of the stud bolt 5 to the lower internal threaded member 3 by using a conventional machine tool, and proceed to step A4.

Step A4: Connect the upper internal thread member 4 with the other end of the stud bolt 5, and weld the upper internal thread member 4 to the outer plate side of the floating tank 7.

Step B: Dismantling after the fixtures are in place at sea.

Step B includes the following steps:

Step B1: use part of the mooring system to temporarily position the new semi-submersible oil production platform, control the movement of the new semi-submersible oil production platform, and enter step B2.

Step B2: Pull the lower buoyancy tank 6 by a deck winch or other implements, control its movement, prepare for removing the temporary fixing device, and proceed to step B3.

Step B3: use the underwater robot to cut the joint between the stud bolt 5 and the upper internal threaded member 4, and partially polish it, and proceed to step B4.

Step B4: Complete the demolition work and continue other offshore constructions.

Function and effect of embodiment

According to the temporary fixing device and construction method involved in this embodiment, the combination of traditional welding and mechanical mechanism connection methods is adopted, which has high technical maturity and low cost; The connection between one side of the head bolt and the platform requires less underwater operations, and the operations are all on the outside of the floating body, which has high safety; 3. The present invention realizes the purpose of connecting the upper and lower floating tanks into one body through a simple mechanism. During the towing process, The relative movement between the upper and lower pontoons is suppressed and restrained, which ensures the safety of transportation. 4. The scope of application of the present invention is not limited by factors such as the shape, size, and quantity of the floating tank, and the application scope is wide. In summary, the present invention has the advantages of adapting to the connection of buoyant tanks of different sizes and shapes, high structural safety and reliability, low cost, and simple offshore construction, and can be widely used in the needs of new semi-submersible oil production platforms. A type of platform that temporarily fixes multiple buoys during sea towage.

The above embodiments are preferred examples of the present invention, and are not intended to limit the protection scope of the present invention.

Claims (9)

1. a temporary fastening device, for novel semisubmersible oil production platform wet haul defeated in upper buoyancy tank and lower buoyancy tank between, it is characterized in that, comprising:

Several base constructions, above the flying deck being arranged on described lower buoyancy tank;

Latch structure, with described base construction one_to_one corresponding, below the underdeck being arranged on described upper buoyancy tank, the top of described base construction;

Lower internal thread component, is fixed on the side of described base construction;

Upper internal threaded component, is fixed on the side of described upper buoyancy tank, directly over described lower internal thread component; And

Thru-bolt, two ends are mutually permanently connected with described lower internal thread component and described upper internal threaded component respectively,

Wherein, described base construction, central authorities have perforate,

Described latch structure inserts in described perforate.

2. temporary fastening device according to claim 1, is characterized in that:

Wherein, the size of described perforate is greater than the size of described latch structure.

3. temporary fastening device according to claim 1, is characterized in that:

Wherein, the shape of described perforate can be square hole, circular hole, ellipse.

4. temporary fastening device according to claim 1, is characterized in that:

Wherein, described thru-bolt can according to the distance free-extension between described upper buoyancy tank and described lower buoyancy tank.

5. a temporary fastening device construction method, for novel semisubmersible oil production platform wet haul defeated in upper buoyancy tank and lower buoyancy tank between, it is characterized in that, comprise the following steps:

Steps A, installs anchor fitting in shipyard; And

Step B, removes after described anchor fitting is at sea in place,

Wherein, described steps A, has:

Steps A 1, arranges that by base construction in place and described lower buoyancy tank is welding as one, and arrange certain support pier on the flying deck of described lower buoyancy tank;

Steps A 2, lifted above described lower buoyancy tank by described upper buoyancy tank, and latch structure inserts in the perforate of described base construction by leading the modes such as cable traction by employing by crane;

Steps A 3, is connected one end of thru-bolt with lower internal thread component; And

Steps A 4, is connected the other end of upper internal threaded component with described thru-bolt, and by described upper internal threaded Member Welding on the outside plate side of described upper buoyancy tank,

Described step B, has:

Step B1, utilizes part anchoring system to locate described novel semisubmersible oil production platform temporarily, controls described novel semisubmersible oil production platform motion;

Step B2, by buoyancy tank lower described in deck winch or other facility tractives, controlling its motion, preparing for removing described temporary fastening device;

Step B3, employing under-water robot cuts the junction between described thru-bolt and described upper internal threaded component, and detail sanding; And

Step B4, completes dismounting operation, continues other offshore constructions.

6. temporary fastening device construction method according to claim 5, is characterized in that:

Wherein, several base constructions described, above the flying deck being arranged on described lower buoyancy tank;

Described latch structure, with described base construction one_to_one corresponding, below the underdeck being arranged on described upper buoyancy tank, the top of described base construction;

Described lower internal thread component, is fixed on the side of described base construction;

Described upper internal threaded component, is fixed on the side of described upper buoyancy tank, directly over described lower internal thread component; And

Described thru-bolt, two ends are mutually permanently connected with described lower internal thread component and described upper internal threaded component respectively,

Wherein, described base construction, central authorities have described perforate,

Described latch structure inserts in described perforate.

7. temporary fastening device construction method according to claim 5, is characterized in that:

Wherein, the size of described perforate is greater than the size of described latch structure.

8. temporary fastening device construction method according to claim 5, is characterized in that:

Wherein, the shape of described perforate can be square hole, circular hole, ellipse.

9. temporary fastening device construction method according to claim 5, is characterized in that:

Wherein, described thru-bolt can according to the distance free-extension between described upper buoyancy tank and described lower buoyancy tank.