Method for modifying a jack-up offshore drilling platform adapted for offshore rocket launching

Abstract

The application discloses a reconstruction method of a self-elevating offshore drilling platform for offshore rocket launching, which comprises the following steps: step 1, bottom cabin reconstruction, reconstructing the bottom cabin of the offshore drilling platform into a larger and heavier equipment working room; step 2, main deck reconstruction, reconstructing the main deck of the offshore drilling platform for arranging a flow guide groove, a launching platform, an umbilical tower, a rocket comprehensive test room and a cooling water valve room; step 3, second deck reconstruction, reconstructing the second deck of the offshore drilling platform for arranging a rocket hangar and a cooling water tank; step 4, umbilical tower arrangement, arranging the umbilical tower on the main deck of the offshore drilling platform; step 5, living building reconstruction; and step 6, rocket erecting mechanism and hydraulic system design. The offshore drilling platform is reconstructed for adapting to offshore launching by combining with an offshore rocket launching technological process, and the application provides a train of thought and reference for reconstructing similar self-elevating offshore platforms for adapting to offshore launching.

Description

Technical Field

[0001] This invention relates to the field of marine rocket launch technology, and more specifically, to a method for modifying a self-elevating offshore drilling platform to suit marine rocket launches. Background Technology

[0002] Currently, the construction methods of existing offshore platforms both domestically and internationally can be broadly categorized into two types: fixed and floating. Fixed platforms are structures whose position remains unchanged during their service life. While they may be constructed using floating methods, they are not supported by buoyancy once in place. Depending on the water depth, fixed offshore platforms are further classified into gravity-type and pile-type structures. Floating platforms represent a development of shipbuilding engineering structures in the marine environment. They fully utilize the characteristics and advantages of objects buoyancy rather than drifting in seawater, and, combined with the needs of the marine environment and marine development, have creatively developed and constructed various distinctive floating platforms, such as jack-up, self-elevating, and semi-submersible types.

[0003] Self-elevating platforms are divided into submerged self-elevating platforms and stilt self-elevating platforms. The upper part is a floating body similar to a barge, and the perimeter is equipped with stilts. The raising and lowering of the stilts is controlled by a gear and rack hydraulic mechanical device. When moving, the stilts extend upwards from the platform. When reaching the working surface, the stilts sink and insert into the seabed to a certain depth to fix the platform under force, and the platform then rises away from the water surface to reach the design elevation. To move again, the process is reversed.

[0004] The sea-based launch platform undertakes the tasks of vertically erecting, jointly inspecting, fueling, and launching spacecraft. Its function is different from any other type of sea platform. Since the umbilical tower for vertically erecting spacecraft needs to be installed on the upper part of the platform, the platform itself is not only the working surface, but also the fixed end of these tall buildings. The launch drift requirements and the small displacement requirements of various fueling pipelines all require the platform to have stable and solid properties. In addition, the rocket should be able to resist the effects of wind and waves from the time it is erected on the launch pad until the rocket is launched.

[0005] Considering the flexibility of the operational areas for sea-based launch missions and the wide distribution and structural characteristics of offshore jack-up drilling platforms, it is necessary to modify offshore jack-up drilling platforms to meet the needs of sea-based rocket launches. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the main objective of the present invention is to provide a method for modifying a self-elevating offshore drilling platform to adapt to offshore rocket launches, so as to solve one or more problems in the prior art.

[0007] The technical solution of the present invention is as follows:

[0008] This invention first provides a method for modifying a self-elevating offshore drilling platform to adapt to offshore rocket launches, comprising the following steps: Step 1, bottom cabin modification: modifying the bottom cabin of the offshore drilling platform to house larger and heavier equipment; Step 2, main deck modification: modifying the main deck of the offshore drilling platform to accommodate a flow channel, launch pad, umbilical tower, rocket integrated testing room, and cooling water valve room; Step 3, second deck modification: modifying the second deck of the offshore drilling platform to accommodate a rocket hangar and cooling water tank; Step 4, umbilical tower arrangement: arranging an umbilical tower on the main deck of the offshore drilling platform; Step 5, living quarters modification; Step 6, designing the rocket erection mechanism and hydraulic system.

[0009] In some embodiments, the modification of the bilge includes: (1) strengthening the bilge by arranging vertical members at appropriate locations on the bottom plate to increase the standard value of the uniformly distributed live load borne by the main deck to not less than 20 kN / m. 2 (2) The lower deck is converted into rooms for air conditioning, power distribution, fire protection, automatic control, refueling, gas distribution, etc.

[0010] In some embodiments, the main deck modification includes: (1) retaining the bow living quarters, helicopter platform, stern high mast lights, midships side second deck columns, and starboard crane base; (2) removing the stern cantilever beam, stern and guide channel second deck columns, and crane base; (3) adding welded T-shaped steel to the bottom of the main deck; (4) adding a cantilevered steel platform to the stern; and (5) arranging the guide channel, launch pad, umbilical tower, rocket integrated test room, and cooling water valve room.

[0011] In some embodiments, the standard value of the uniformly distributed live load that the main deck can withstand after modification is not less than 20 kN / m. 2 .

[0012] In some embodiments, the modification of the second deck includes: (1) retaining the bow living quarters, helicopter platform, second decks on both sides of the midship section, and starboard crane of the offshore platform; (2) removing the second deck at the stern section and the location of the diversion channel of the offshore platform; and (3) modifying the second decks on both sides of the midship section of the offshore platform so that the modified decks can withstand a uniformly distributed live load of not less than 10 kN / m. 2 (4) Arrange the rocket hangar and cooling water tank.

[0013] In some embodiments, the umbilical tower arrangement includes: (1) the offshore launch pad umbilical tower adopts a steel frame structure; (2) a rotating shaft and upper and lower supports are set at the front end of the umbilical tower, and a horizontal cable swing rod is installed; (3) the vertical components and diagonal braces of the umbilical tower adopt hot-rolled seamless steel pipes, and the horizontal components adopt H-beams.

[0014] In some embodiments, the renovation of the living quarters includes: the living quarters are located at the bow of the offshore platform, and some rooms in the living quarters are renovated into working rooms such as testing rooms, power distribution rooms, automatic control rooms, gas supply equipment rooms, system work rooms, and fire monitoring duty rooms.

[0015] In some embodiments, the rocket erection mechanism includes: an erection frame and two secondary erection hydraulic cylinders, the rotation fulcrum of the erection frame is set on the launch pad, the fixed end of the erection hydraulic cylinder is connected and fixed to the main deck, and the telescopic end of the erection hydraulic cylinder is connected and fixed to the erection frame.

[0016] In some embodiments, the hydraulic system design includes: the hydraulic system consists of two parts, signal control and hydraulic power. The signal control part is used to drive the control valve in the hydraulic power part to operate. The control method adopts a double-cylinder erection form, with each cylinder equipped with an independent motor and pump, and independently providing oil to the cylinder, so that the cylinders basically keep synchronized during operation and are not affected by uneven load.

[0017] The present invention also provides a marine rocket launch platform modified according to the aforementioned modification method.

[0018] The beneficial effects of this invention compared to the prior art are as follows: This invention utilizes a self-elevating offshore oil platform and, in conjunction with the requirements of the offshore launch process, has conducted targeted research on a modification scheme adapted to offshore launch. This mainly includes modifications to the bottom deck, main deck, and second deck of the offshore platform, as well as the arrangement of the umbilical tower, the arrangement of the boom, the rocket erection mechanism, and the power system. By leveraging the widespread distribution of existing self-elevating offshore oil platforms, this invention meets the flexibility requirements of offshore launch mission execution areas and provides ideas and references for the adaptation of similar self-elevating offshore platforms to offshore launch. Attached Figure Description

[0019] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0020] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0021] Figure 1Side view of a jack-up offshore oil platform;

[0022] Figure 2 Plan view of the bottom structure of a jack-up offshore oil platform;

[0023] Figure 3 This is a plan view of the main deck structure of a jack-up offshore oil platform.

[0024] Figure 4 Plan layout of the main deck modification for a self-elevating offshore oil platform;

[0025] Figure 5 This is a plan view of the second deck structure of a jack-up offshore oil platform.

[0026] Figure 6 Plan layout for the conversion of the second deck of a self-elevating offshore oil platform;

[0027] Figure 7 Plan layout of the umbilical tower of a self-elevating offshore oil platform;

[0028] Figure 8 Elevation view of the umbilical tower of a self-elevating offshore oil platform;

[0029] Figure 9 This is an elevation view of a sea-based rocket launch platform. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Here, the illustrative embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0031] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0032] It should be understood that the terms "comprising / including," "consisting of," or any other variations are intended to cover non-exclusive inclusion, such that a product, apparatus, process, or method that comprises a list of elements includes not only those elements but may also include, where necessary, other elements not expressly listed, or elements inherent to such a product, apparatus, process, or method. Without further limitation, an element defined by the phrases "comprising / including," "consisting of," does not exclude the presence of additional identical elements in the product, apparatus, process, or method that includes said element.

[0033] It should also be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device, component or structure referred to must have a specific orientation, be constructed or operated in a specific orientation, and should not be construed as a limitation of the present invention.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0035] like Figure 1 As shown, the self-elevating offshore platform is a pile-type steel structure platform supported on a solid seabed by steel pile legs. A working deck is located on top of the piles, and the platform's raising and lowering is controlled by gears, racks, and hydraulic mechanisms. Before operation, the offshore platform is towed to the designated sea area, the pile legs are lowered and inserted into the seabed for fixation, and the platform is then raised to begin work. After the operation is completed, the platform is lowered, the pile legs are removed, and it can be towed to a new location. The self-elevating offshore platform has advantages such as light weight, large span, wide adaptability to water depths, minimal impact from wave and current loads, and ease of assembly and splicing, enabling it to operate in various sea depths and environments.

[0036] Based on the advantages of self-elevating offshore platforms, such as their large planar dimensions, high load capacity, towing capability, ease of modification, and minimal impact from sea waves, they can be modified into offshore launch platforms for launching small and medium-sized carrier rockets in different sea areas and sea conditions. Furthermore, due to their ease of assembly, several offshore platforms can be combined and modified into offshore launch platforms for launching large carrier rockets.

[0037] This invention utilizes a modified offshore oil platform provided by a research institute. The platform has a main deck dimension of 62m × 37m, an outer profile dimension of 73m × 37m, a height of 23m, and a lifting height of 15m. It is supported on the seabed by four steel pile legs with a diameter of 3.2m. The platform comprises a lower deck, main deck, second deck, and equipment deck. The second deck houses living quarters, engineering buildings, hydraulic systems, guide supports, a containment area, and other living and working facilities, as well as equipment such as cranes, a helicopter platform, and high-mast lighting.

[0038] The following detailed description, with reference to specific illustrations, illustrates the method for modifying a self-elevating offshore drilling platform to accommodate offshore rocket launches according to the present invention.

[0039] Step 1: Modification of the lower deck.

[0040] The bottom tank of the offshore oil platform is equipped with ballast tanks, diesel tanks, crude oil tanks, sludge tanks, well washing fluid tanks, sludge tanks, mud tanks, fresh water tanks, pump rooms, equipment rooms, containment areas, and other working rooms, as well as equipment such as guide supports and crane bases.

[0041] The bottom deck is constructed of AH36 steel with a double-layered bottom plate. The bottom plate thickness ranges from 9 to 26 mm. Visible reinforcement consists of L126×80×7 angle steel, spaced at 550 mm intervals, arranged along the entire length. Visible beams are welded T-shaped steel sections, T-450×8W+140×12F and T-550×12W+300×16F, spaced at 1500 mm and 2000 mm intervals, arranged along the entire length. The bottom plate can withstand a uniformly distributed live load of not less than 20 kN / m². 2 The structural plan of the lower compartment is as follows: Figure 2 As shown.

[0042] Offshore drilling platforms, originally used primarily for oil and gas drilling, require space to be accommodated when converted into rocket launch platforms. These platforms house rocket launch equipment used for testing, erection, and vertical launch. In particular, the bilge compartment needs to be modified to accommodate larger and heavier equipment to support offshore rocket launch capabilities.

[0043] The modifications to the lower deck include the following aspects:

[0044] (1) The bottom tank was reinforced and modified, and vertical components were arranged at appropriate locations on the bottom plate to increase the standard value of the uniformly distributed live load that the main deck could withstand to 20 kN / m. 2 ;

[0045] (2) The lower compartment will be converted into a work room for larger and heavier equipment such as air conditioning, power distribution, fire protection, automatic control, refueling and gas distribution.

[0046] Step 2, main deck modification.

[0047] The main deck of the offshore oil platform is equipped with a first-floor living quarters, equipment rooms, a containment area, and other working facilities, as well as equipment such as guide supports, crane bases, and cantilever beam bases.

[0048] The main deck is constructed of AH36, DH36, and EH36 steel, with a deck thickness ranging from 8 to 26 mm. Invisible stiffeners consist of L100×63×7 angle steel, spaced at 550 mm intervals, arranged continuously. Visible stiffeners are welded T-shaped steel with a cross-section of T-300×8W+140×10F, spaced at 550 mm intervals, arranged continuously. Invisible beams are welded T-shaped steel with cross-sections of T-450×10W+140×14F and T-500×12W+140×16F, spaced at 1500 mm and 2000 mm intervals, arranged continuously. The main deck can withstand a uniformly distributed live load of no less than 10 kN / m². 2 The main deck structure layout is as follows: Figure 3 .

[0049] To meet the requirements for launching rockets at sea, the main deck of the offshore oil platform needs to be modified to accommodate a flow channel, launch pad, umbilical tower, rocket integrated testing room, and cooling water valve room.

[0050] The main deck modifications include the following aspects:

[0051] (1) The following structures will be retained on the offshore platform: the bow living quarters, the helicopter platform, the stern high-mast lights, the two-story deck pillars on both sides of the midship section, and the starboard crane base.

[0052] (2) Remove the cantilever beam at the stern of the offshore platform, the second-floor pillars at the stern and guide channel locations, and the crane base at 16,500 meters to the left of midship;

[0053] (3) Welded T-shaped steel T-300×8W+140×10F is added to the bottom of the main deck, with a spacing of 550 and material DH36.

[0054] (4) A cantilevered steel platform with a plan dimension of 8m × 37m is added to the stern;

[0055] (5) Arrange the flow channel, launch pad, umbilical tower, rocket integrated test room, and cooling water valve room.

[0056] All functional rooms are steel frame structures, with H-beams and hot-rolled seamless steel pipes as components. The H-beams are HW400×400 and HW300×300, and the hot-rolled seamless steel pipes are φ245×12. The component material is DH36.

[0057] Through the specific modifications made to the main deck, the platform's functionality was expanded to accommodate rocket launches while adhering to the principle of minimal alterations. Simultaneously, some living space was retained for use by aerospace scientists and engineers during rocket testing. This facilitates testing while providing basic living support for the scientific and technical personnel.

[0058] The standard value of the uniformly distributed live load that the main deck can withstand after modification is 20 kN / m. 2 The main deck renovation layout is as follows: Figure 4 As shown.

[0059] Step 3, second deck renovation.

[0060] The second deck of the offshore oil platform is equipped with living quarters, equipment rooms, enclosure areas, and other working facilities, as well as equipment such as cranes, hot oil boilers, crude oil export drums, high-efficiency separators, and electric dehydrators.

[0061] The second deck is constructed of AH36 and DH36 steel, with a deck thickness of 6mm. The longitudinal stiffeners are L100×63×7 angle steel, spaced at 550mm intervals, arranged along the entire length. The invisible beams are welded T-shaped steel with cross-sections of T-300×8W+140×10F and T-450×10W+140×14F, spaced at 1500mm and 2000mm intervals, also arranged along the entire length. The second deck can withstand a live load of not less than 7kN / m². The structural plan of the second deck is as follows: Figure 5 As shown.

[0062] This invention modifies the second deck of the offshore oil platform to accommodate a rocket hangar and cooling water tank.

[0063] See Figure 6 The second deck renovation includes the following aspects:

[0064] (1) The bow living quarters, helicopter platform, two decks on both sides of the midship section, and starboard crane of the offshore platform shall be retained;

[0065] (2) Remove the second deck at the stern of the offshore platform and the location of the guide channel;

[0066] (3) Modify the two decks on both sides of the midship section of the offshore platform to withstand a uniformly distributed live load of 10 kN / m. 2 ;

[0067] (4) Arrange the rocket hangar and cooling water tank.

[0068] After the second deck was modified, it has sufficient space and vertical load-bearing capacity to accommodate rocket hangars and cooling water tanks.

[0069] Step 4, Layout of the umbilical tower.

[0070] The umbilical tower is mainly responsible for pre-launch testing and inspection, fuel loading, and other tasks. It needs to correspond to the elevation and azimuth of various instrument compartments, disconnect plugs, air pipe sockets, fueling ports, safety overflow ports, and antenna sockets on the spacecraft.

[0071] (1) The umbilical tower of the sea launch platform adopts a steel frame structure with a plan size of 3500×5500, column spacing of 2000 and 3300, standard floor height of 3200, thirteen floors above the main deck of the umbilical tower, and a height of 41.7m.

[0072] (2) The beams and columns of the umbilical tower are connected by seamless steel pipes. The vertical components are φ300×14 and φ250×12; the horizontal components are φ180×12 and φ150×10; the diagonal bracing components are φ100×6 and φ70×6, and the component material is DH36.

[0073] (3) A rotating shaft and upper and lower supports are installed at the front end of the umbilical tower, and a horizontal cable swing rod is installed.

[0074] (4) The vertical components and diagonal braces of the umbilical tower are made of hot-rolled seamless steel pipes, and the horizontal components are made of H-beams. The hot-rolled seamless steel pipes are φ300×12, the H-beams are HW200×200 and HW200×200, and the component material is DH36.

[0075] The plan layout of the umbilical tower is shown in the figure. Figure 7 The facade layout of the umbilical tower is shown in [reference]. Figure 8 .

[0076] Step 5: Renovation of the residential building.

[0077] The living quarters are located at the bow of the offshore platform, with five floors above the main deck and a height of 17.3m. In accordance with the needs of rocket launch, the helicopter platform is retained, and some rooms in the living quarters are converted into working rooms such as test rooms, power distribution rooms, automatic control rooms, gas supply equipment rooms, system work rooms, and fire monitoring duty rooms.

[0078] During the renovation of the living quarters, test rooms, power distribution rooms, control rooms, as well as refueling and gas supply equipment rooms, system work rooms, and fire monitoring duty rooms were set up around the rocket. These work rooms are mainly used for testing before the rocket is erected, for diagnosing and handling potential faults before the rocket is erected, which is the key to ensuring the successful launch of the rocket and an important guarantee for achieving the high reliability requirements of aerospace launches.

[0079] Step 6: Design the rocket erection mechanism and hydraulic system.

[0080] The erection mechanism includes an erector frame and two secondary erection hydraulic cylinders. The rotation fulcrum of the erector frame is located on the launch pad. The fixed ends of the erection hydraulic cylinders are connected and fixed to the main deck, while the telescopic ends are connected and fixed to the erector frame. After the ship-borne rocket arrives at the sea launch platform, the two secondary erection hydraulic cylinders erect the erector frame, raising the frame and rocket from a horizontal to a vertical position. Once erected, the rocket docks with the launch pad, the windproof clamping device on the launch pad secures the rocket feet, and the cable sway bar on the umbilical tower docks with the rocket, holding it in place. The erector frame then changes from a vertical to a horizontal position.

[0081] This hydraulic system consists of two parts: signal control and hydraulic power. The signal control part is used to drive the control valve in the hydraulic power part.

[0082] Hydraulic system parameters and control:

[0083] System parameters:

[0084] Load assumptions: The unloaded erection load of the rocket body is ≤50t, and the self-weight of the rocket support steel truss is ≤100t.

[0085] 1. Rated pressure: 16MPa;

[0086] 2. Rated flow rate: 4*150L / min;

[0087] 3. Motor power: 4*45kw + 15kw;

[0088] 4. Electromagnet signal: DC24V, proportional valve control signal: -10V to +10V;

[0089] 5. Medium used: 46# anti-wear hydraulic oil.

[0090] Control method:

[0091] The system employs a dual-cylinder erection mechanism, with each cylinder equipped with an independent motor and pump to provide its own oil supply. This ensures that the cylinders operate in near-synchronous fashion and are unaffected by uneven loads. Each cylinder is also equipped with a displacement sensor and a proportional directional valve, forming a closed-loop control system. The displacement sensor detects the cylinder's displacement in real time and feeds it back to the PLC. The PLC compares the displacement of the two cylinders and adjusts the opening of the proportional valve to regulate the cylinder's speed, thus achieving synchronization. The control system primarily functions to provide remote and local display and control of the erection and tilting device for raising and lowering. It mainly consists of a remote control console, a local control assembly, a signal transfer box, switches, cables, and sensors.

[0092] Offshore launch platform process flow:

[0093] (1) The main function of the sea-based launch platform is as a rocket launch pad. The transport ship approaches the stern of the sea-based launch platform, and the rocket is horizontally hoisted from the ship to the erector transport vehicle on the main deck of the platform. The erector completes the erection and docking of the rocket. The elevation of the rocket launch platform is as follows: Figure 9 As shown;

[0094] (2) Perform verticality adjustment and initial aiming of the entire rocket, and complete the connection of the launch pad with the umbilical tower's electrical, power, air conditioning, and fueling systems;

[0095] (3) Conduct functional checks on the power system and electrical system;

[0096] (4) Perform nitrogen, hydrogen and helium purging and full system gas testing;

[0097] (5) Conduct kerosene filling signal connection test and filling, and enter the pre-injection procedure;

[0098] (6) Rocket ignition and launch.

[0099] This invention utilizes a self-elevating offshore oil platform and, in conjunction with the requirements of the offshore launch process, conducts targeted research on a modification scheme adapted for offshore launch. This mainly includes modifications to the platform's bottom deck, main deck, and second deck, as well as the arrangement of the umbilical tower, the swing arm, the rocket erection mechanism, and the power system. This provides ideas and references for similar self-elevating offshore platforms to adapt to offshore launch modifications.

[0100] It will be readily understood by those skilled in the art that, without conflict, the above-mentioned preferred solutions can be freely combined and superimposed.

[0101] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for modifying a self-elevating offshore drilling platform to adapt to offshore rocket launches, characterized in that, Includes the following steps: Step 1, bilge modification: Modify the bilge of the offshore drilling platform to transform it into a working room for larger and heavier equipment. Step 2, Main deck modification: Modify the main deck of the offshore drilling platform to accommodate the diversion channel, launch pad, umbilical tower, rocket integrated test room, and cooling water valve room; Step 3: Second deck modification. The second deck of the offshore drilling platform will be modified to accommodate rocket hangars and cooling water tanks. Step 4, Umbilical tower installation: Install the umbilical tower on the main deck of the offshore drilling platform; Step 5: Renovation of the residential building; Step 6: Design the rocket erection mechanism and hydraulic system.

2. The modification method according to claim 1, characterized in that, The modifications to the lower deck include: (1) Strengthen and modify the bottom tank, and arrange vertical components at appropriate locations on the bottom plate to increase the standard value of the uniformly distributed live load that the main deck can withstand to no less than 20 kN / m. 2 ; (2) The lower deck is converted into rooms for air conditioning, power distribution, fire protection, automatic control, refueling, gas distribution, etc.

3. The modification method according to claim 1, characterized in that, The main deck modifications include: (1) The following structures will be retained on the offshore platform: the bow living quarters, the helicopter platform, the stern high-mast lights, the two-story deck pillars on both sides of the midship section, and the starboard crane base. (2) Remove the cantilever beam at the stern of the offshore platform, the second-floor columns at the stern and the location of the guide channel, and the crane base; (3) Welded T-shaped steel is added to the bottom of the main deck; (4) A cantilevered steel platform is added to the stern; (5) Arrange the flow channel, launch pad, umbilical tower, rocket integrated test room, and cooling water valve room.

4. The modification method according to claim 3, characterized in that, The standard value of the uniformly distributed live load that the main deck can withstand after modification shall not be less than 20 kN / m. 2 .

5. The modification method according to claim 1, characterized in that, The second-deck modification includes: (1) The bow living quarters, helicopter platform, two decks on both sides of the midship section, and starboard crane of the offshore platform shall be retained; (2) Remove the second deck at the stern of the offshore platform and the location of the flow channel; (3) Modify the two decks on both sides of the midship section of the offshore platform so that the standard value of the uniformly distributed live load to be borne by the modified decks shall not be less than 10 kN / m. 2 ; (4) Arrange the rocket hangar and cooling water tank.

6. The modification method according to claim 1, characterized in that, The umbilical cord tower arrangement includes: (1) The umbilical tower of the offshore launch pad adopts a steel frame structure; (2) A rotating shaft and upper and lower supports are installed at the front end of the umbilical tower, and a horizontal cable swing rod is installed; (3) The vertical components and diagonal braces of the umbilical tower are made of hot-rolled seamless steel pipes, and the horizontal components are made of H-beams.

7. The modification method according to claim 1, characterized in that, The renovation of the residential building includes: The living quarters are located at the bow of the offshore platform. Some rooms in the living quarters have been converted into work rooms such as testing rooms, power distribution rooms, automatic control rooms, gas supply equipment rooms, system work rooms, and fire monitoring duty rooms.

8. The modification method according to claim 1, characterized in that, The rocket erection mechanism includes: The system consists of an erecting frame and two secondary erecting hydraulic cylinders. The slewing fulcrum of the erecting frame is located on the launch pad. The fixed end of the erecting hydraulic cylinder is connected and fixed to the main deck, while the telescopic end of the erecting hydraulic cylinder is connected and fixed to the erecting frame.

9. The modification method according to claim 1, characterized in that, The hydraulic system design includes: The hydraulic system consists of two parts: signal control and hydraulic power. The signal control part is used to drive the control valve in the hydraulic power part to actuate. The control method adopts a dual-cylinder erection system, with each cylinder equipped with an independent motor and pump, providing an independent oil source to the cylinder, so that the cylinders can basically maintain synchronization during operation and are not affected by uneven load.

10. A marine rocket launch platform modified according to any one of claims 1 to 9.

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