Marine pipeline flexible support and inner and outer pipeline mounting structure

Abstract

The invention relates to the technical field of ocean engineering equipment, in particular to an ocean pipeline flexible support and an inner and outer pipeline mounting structure. A flexible support base is arranged at the top of a fixed bottom plate, a rod barrel is arranged in the middle of the flexible support base, damping springs are fixedly connected to the bottoms of top rods, and a supporting plate is fixedly connected to the bottoms of the damping springs; a middle transition cavity is formed in the bottom of the rod barrel, a pressure adjusting cavity is formed in the side face of the vent hole, a lower sealing cavity is movably connected to the top of the ejector rod, an upper sealing cavity is formed in the top of the lower sealing cavity, a screw supporting seat is arranged on the upper portion of the screw supporting seat, a screw is arranged in the middle of the screw supporting seat, and an upper ring gear is arranged on the upper portion of the upper sealing cavity. The lower fastening assemblies are arranged on the two sides of the lower sealing cavity, and the upper fastening assemblies are arranged on the two sides of the upper sealing cavity, so that the installation process of the submarine pipeline is simplified, the operation time is greatly shortened, and the construction efficiency and the engineering quality of deep sea pipeline installation are effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore engineering equipment, and more particularly to a flexible support for offshore pipelines and an installation structure for internal and external pipelines. Background Art

[0002] The flexible support for offshore pipelines and the installation structure for internal and external pipelines are a kind of equipment for offshore engineering, which play an important role in the installation and operation of offshore pipelines.

[0003] Currently, the flexible support for offshore pipelines and the installation structure for internal and external pipelines mainly consist of a fixed base, a flexible support, and a pipeline connection device. Among them, the fixed base, as the basic support component, firmly anchors the submarine pipeline on the seabed surface; the pipeline connection device is responsible for realizing the effective connection of the submarine pipeline; and the flexible support, relying on its own characteristics, buffers the external forces generated by ocean current impacts and geological movements, ensuring the stable operation of the pipeline system. However, there are still some deficiencies in this structural system: 1. In the pipeline connection link, although the traditional welding process can ensure that the connection part has high strength and sealing performance, due to the particularity of the underwater operation environment, the welding operation process is complex, requiring professional equipment and personnel, with low construction efficiency and high costs. In contrast, although the conventional clamp connection method has the advantages of convenient operation and short construction period, its connection reliability is easily affected by the complex underwater environment. Under the long-term action of seawater erosion and external vibration, the clamp is prone to problems such as loosening and sealing failure, making it difficult to ensure the long-term stable operation of the pipeline system; 2. Due to the irregularity of the seabed topography, it is difficult to ensure that each fixed support is installed at the same horizontal height, and there is inevitably a height difference between adjacent supports. This height deviation not only increases the construction difficulty of pipeline laying and connection, but also causes stress concentration in the pipeline locally, affecting the structural integrity of the pipeline, reducing the sealing performance of the connection part, and thus shortening the service life of the entire pipeline system and posing potential safety hazards. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a flexible support for offshore pipelines and an installation structure for internal and external pipelines to solve the problems existing in the above background art.

[0005] The present invention provides the following technical solution: a flexible support for an offshore pipeline and an installation structure for inner and outer pipelines. A flexible support base is provided on the top of the fixed bottom plate. A rod barrel is provided in the middle of the flexible support base. A top rod is provided on the top of the rod barrel. A shock-absorbing spring is fixedly connected to the bottom of the top rod. A support plate is fixedly connected to the bottom of the shock-absorbing spring. An intermediate transition cavity is opened at the bottom of the rod barrel. An upper ventilation hole is opened at the top of the intermediate transition cavity. A lower ventilation hole is opened on the side of the intermediate transition cavity. A ventilation hole is connected to the side of the lower ventilation hole. A pressure adjustment cavity is provided on the side of the ventilation hole. The top of the top rod is movably connected to a lower sealing cavity. An upper sealing cavity is provided on the top of the lower sealing cavity. A screw support seat is provided on the upper part of the upper sealing cavity. A screw is provided in the middle of the screw support seat. An upper ring gear is provided on the upper part of the upper sealing cavity. Lower fastening components are provided on both sides of the lower sealing cavity. Upper fastening components are provided on both sides of the upper sealing cavity; Further, lower limit blocks are provided on the inner wall of the rod barrel at the top end of the intermediate transition cavity. There are four lower limit blocks. An upper limit block is provided at the bottom end of the top rod. Lower limit blocks are provided on the inner wall at the top end of the rod barrel.

[0006] Further, a flexible support base is provided on the top of the fixed bottom plate. Eight flexible support bases are evenly distributed on the top of the fixed bottom plate. A rod barrel is movably connected to the middle of the flexible support base. Eight top rods are respectively connected to the flexible support bases. Pressure equalizing notches are opened at the bottom of the rod barrel. Two pressure equalizing notches are provided on the side of the pressure adjustment cavity.

[0007] Further, a lower fixing block is provided on the side of the lower sealing cavity. Threaded fixing holes are opened at the top of the lower fixing block. Three threaded fixing holes are provided at the top end of the lower fixing block. Threaded power holes are opened at the intervals of the threaded fixing holes. A ring gear groove is opened inside the lower fixing block. A lower ring gear is provided on the side of the ring gear groove. A limit block is provided on the side of the lower ring gear. There are two ring gear grooves and limit blocks respectively. A support seat is fixedly connected to the bottom surface of the lower sealing cavity. Upper sliding grooves are provided on the inner side surface of the lower sealing cavity. There are two upper sliding grooves.

[0008] Further, an upper sealing cavity is provided on the top of the lower sealing cavity. An upper fixing block is provided on the side of the upper sealing cavity corresponding to the position of the lower fixing block. Bolts are threadedly connected to the top end of the upper fixing block. There are four bolts. The bolts are provided at the top positions of the threaded fixing holes and the threaded power holes. A hollow screw support seat is fixedly connected to the top of the upper sealing cavity. A screw with threads at both ends is rotatably connected to the middle of the screw support seat. The middle of the screw is provided with, the middle of the upper sealing cavity is provided with an upper ring gear. Lower sliding grooves are provided on the inner side surface of the upper sealing cavity.

[0009] Further, upper fastening components are arranged on both side surfaces of the upper sealing cavity. An upper sealing rubber ring is arranged on the inner side surface of the upper fastening component. An upper fastening component fixing block is fixedly connected to the top side surface of the upper fastening component. Two internally threaded upper thread positioning blocks are arranged on the top of the upper fastening component.

[0010] Further, lower fastening components are arranged on both side surfaces of the lower sealing cavity. A lower sealing rubber ring is arranged on the inner side surface of the lower fastening component. A lower fastening component fixing block is fixedly connected to the bottom side surface of the lower fastening component. Two internally threaded lower thread positioning blocks are arranged on the top of the lower fastening component.

[0011] Further, the four screw rods are evenly distributed on the outer sides of the upper sealing cavity and the lower sealing cavity.

[0012] The technical effects and advantages of the present invention: 1. By setting the flexible support in the present invention, a dual function for the subsea pipeline is achieved: dynamic shock absorption and buffering and adaptive height adjustment. The core lies in the integrated pneumatic drive leveling system and elastic buffer structure inside the flexible support, and the two work together to improve the installation efficiency. During the support installation stage, the pneumatic drive leveling system constructs an initial equilibrium state through pre-inflation operation. Specifically, compressed air adapted to the seabed installation depth is injected into the pressure regulation cavity in advance, so that a stable air pressure environment is formed in the pressure regulation cavity, the intermediate transition cavity and the main support cavity. At the same time, the liftable support plate is initially positioned in the middle of the main support cavity, leaving sufficient stroke space. The pressure equalizing notches arranged on the side wall of the pressure regulation cavity not only ensure the direct contact between the cavity and the external sea water, but also provide necessary space for the elastic deformation of the pressure regulation cavity. When there is a height difference in the seabed topography, the pressure regulation cavity undergoes elastic deformation under the action of the sea water pressure. The gas inside it flows into the intermediate transition cavity in turn through the ventilation holes and finally enters the main support cavity through the upper ventilation holes. The dynamic transfer of gas pressure drives the support plate to adaptively lift, realizing automatic height compensation between adjacent supports. During this process, the shock absorption springs also play a role, absorbing the external forces generated by the sea current impact and geological movement through elastic deformation, forming a "leveling-shock absorption" integrated protection mechanism. This design effectively avoids the height difference problem in the traditional support installation, significantly improves the installation accuracy and construction efficiency of the subsea pipeline. At the same time, the continuous dynamic buffering function enhances the tolerance of the pipeline system to external complex loads, extends the overall service life, and provides a reliable technical guarantee for deep-sea pipeline projects.

[0013] 2. The pipeline connection device of the present invention constructs a three-dimensional fastening and sealing system by symmetrically arranging double-acting fastening components on both sides of the lower sealing cavity and the upper sealing cavity. Based on the linkage transmission mechanism, this system enables the synchronous and efficient execution of fastening operations and sealing clamping. Specifically, the bolt and the upper and lower ring gears form a composite transmission structure. Through gear meshing and worm and worm gear transmission, the rotational power is transmitted to the central screw. When the screw is driven to rotate, the spiral transmission mechanism integrated at its end forms a linkage relationship with the double-acting fastening. During the process of converting the rotational torque into axial thrust, the upper and lower sealing cavities are gradually fastened in the circumferential direction, and at the same time, the elastic pressing blocks of the double-acting fastening components synchronously clamp the two sides of the pipeline radially. Through the composite action mechanism of "circumferential fastening - axial extrusion", this design not only achieves a double-sealing effect at the pipeline connection part but also significantly improves the overall stability of the connection structure. During the rotational fastening process, the axial component force generated by the wedge-shaped slider structure forces the elastic pressing block to closely fit the outer wall of the pipeline, cooperating with the sealing rubber ring to form multiple sealing lines of defense; while the circumferential thread fastening ensures the structural strength of the connection part. The synchronous coordination of these two actions not only simplifies the installation process of the subsea pipeline but also greatly shortens the operation time, effectively improving the construction efficiency and engineering quality of deep-sea pipeline installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic diagram of the overall structure of the present invention.

[0015] Figure 2 is a schematic diagram of the structure of the present invention at the initial working stage.

[0016] Figure 3 is Figure 1 a schematic diagram of a quarter-sectional structure of

[0017] Figure 4 is Figure 2 a schematic diagram of the structural details at location A.

[0018] Figure 5 is Figure 3 a schematic diagram of the structural details at location B.

[0019] Figure 6 is Figure 3 a schematic diagram of the structural details at location C.

[0020] The reference numerals are as follows: 1, fixed bottom plate; 11, fixed hole; 12, flexible support base; 2, flexible support; 21, ejector rod; 211, upper limit block; 212, shock-absorbing spring; 213, support plate; 22, rod barrel; 221, lower limit block; 222, main support cavity; 223, upper ventilation hole; 224, intermediate transition cavity; 225, lower ventilation hole; 226, pressure adjustment cavity; 227, ventilation hole; 228, pressure equalizing notch; 3, lower sealing cavity; 31, lower fixing block; 311, threaded fixing hole; 312, threaded power hole; 313, ring gear groove; 32, support seat; 33, lower ring gear; 331, limit block; 34, upper sliding groove; 4, upper sealing cavity; 41, upper fixing block; 42, screw support seat; 43, screw; 44, bolt; 45, upper ring gear; 46, lower sliding groove; 5, lower fastening assembly; 51, lower sealing rubber ring; 52, lower fastening assembly fixing block; 53, lower threaded positioning block; 6, upper fastening assembly; 61, upper sealing rubber ring; 62, upper fastening assembly fixing block; 63, upper threaded positioning block. Detailed implementation manners

[0021] Next, the technical solutions in the present invention will be clearly and completely described in conjunction with the drawings in the present invention. In addition, the forms of the various structures described in the following implementation manners are merely examples. The flexible support for marine pipelines and the installation structure of internal and external pipelines involved in the present invention are not limited to the various structures described in the following implementation manners. All other implementation manners obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0022] Referring to Figure 1 and Figure 6 , the present invention provides a flexible support for marine pipelines and an installation structure of internal and external pipelines. A flexible support base 12 is provided on the top of the fixed bottom plate 1. A rod barrel 22 is provided in the middle of the flexible support base 12. An ejector rod 21 is provided on the top of the rod barrel 22. A shock-absorbing spring 212 is fixedly connected to the bottom of the ejector rod 21. A support plate 213 is fixedly connected to the bottom of the shock-absorbing spring 212. An intermediate transition cavity 224 is opened at the bottom of the rod barrel 22. An upper ventilation hole 223 is opened at the top of the intermediate transition cavity 224. A lower ventilation hole 225 is opened on the side of the intermediate transition cavity 224. A ventilation hole 227 is connected to the side of the lower ventilation hole 225. A pressure adjustment cavity 226 is provided on the side of the ventilation hole 227. The top of the ejector rod 21 is movably connected to a lower sealing cavity 3. An upper sealing cavity 4 is provided on the top of the lower sealing cavity 3. A screw support seat 42 is provided on the upper part of the upper sealing cavity 4. A screw 43 is provided in the middle of the screw support seat 42. An upper ring gear 45 is provided on the upper part of the upper sealing cavity 4. Lower fastening assemblies 5 are provided on both sides of the lower sealing cavity 3. Upper fastening assemblies 6 are provided on both sides of the upper sealing cavity 4; During the working process, compressed air adapted to the seabed installation depth is pre-injected into the pressure regulating chamber 226 to form a stable air pressure environment in the pressure regulating chamber 226, the intermediate transition chamber 224, and the main support chamber 222. Meanwhile, the liftable support plate 213 is initially positioned in the middle of the main support chamber 222, reserving sufficient stroke space. The equalizing notches provided on the side wall of the pressure regulating chamber 226 not only ensure direct contact between the chamber and the external seawater but also provide necessary space for the elastic deformation of the pressure regulating chamber. Through the combined action of the above structures, the height difference problem in the installation of traditional brackets is effectively avoided, and the installation accuracy and construction efficiency of submarine pipelines are significantly improved.

[0023] Referring to Figure 6 , on the inner wall of the top rod barrel 22 of the intermediate transition chamber 224, there are four lower limit blocks 221. At the bottom end of the top rod 21, there is an upper limit block 211, and on the top inner wall of the rod barrel 22, there are lower limit blocks 221.

[0024] Referring to Figure 2 , on the top of the fixed base plate 1, there are flexible support bases 12. The eight flexible support bases 12 are evenly distributed on the top of the fixed base plate 1. In the middle of the flexible support base 12, there is a movable connection with the rod barrel 22. The eight top rods 21 are respectively connected to the flexible support bases 12. At the bottom of the rod barrel 22, there are equalizing notches 228, and the two equalizing notches 228 are arranged on the side of the pressure regulating chamber 226.

[0025] Referring to Figure 4 , on the side of the lower sealing chamber 3, there is a lower fixing block 31. On the top of the lower fixing block 31, there are threaded fixing holes 311. The three threaded fixing holes 311 are arranged at the top of the lower fixing block 31. At the interval of the threaded fixing holes 311, there are threaded power holes 312. Inside the lower fixing block 31, there is a ring gear groove 313. On the side of the ring gear groove 313, there is a lower ring gear 33. On the side of the lower ring gear 33, there is a limit block 331. There are two ring gear grooves 313 and limit blocks 331 respectively. At the bottom of the lower sealing chamber 3, there is a fixed connection with a support seat 32. On the inner side of the lower sealing chamber 3, there are two upper sliding grooves 34.

[0026] Referring to Figure 5 , on the top of the lower sealing chamber 3, there is an upper sealing chamber 4. Corresponding to the position of the lower fixing block 31 on the side of the upper sealing chamber 4, there is an upper fixing block 41. At the top of the upper fixing block 41, there are four threaded bolts 44. The four threaded bolts 44 are arranged at the top positions of the threaded fixing holes 311 and the threaded power holes 312. At the top of the upper sealing chamber 4, there is a fixed connection with a hollow screw support seat 42. In the middle of the screw support seat 42, there is a rotatable connection with a screw 43 with threads at both ends. In the middle of the screw 43, there is 431. In the middle of the upper seal 4, there is an upper ring gear 45. On the inner side of the upper sealing chamber 4, there is a lower sliding groove 46.

[0027] Reference Figure 2 and Figure 3 , on both sides of the upper sealing cavity 4, an upper fastening assembly 6 is provided. An upper sealing rubber ring 61 is provided on the inner side of the upper fastening assembly 6. An upper fastening assembly fixing block 62 is fixedly connected to the top side of the upper fastening assembly 6. Two internally threaded upper threaded positioning blocks 63 are provided on the top of the upper fastening assembly 6.

[0028] Reference Figure 2 and Figure 3 , on both sides of the lower sealing cavity 3, a lower fastening assembly 5 is provided. A lower sealing rubber ring 51 is provided on the inner side of the lower fastening assembly 5. A lower fastening assembly fixing block 52 is fixedly connected to the bottom side of the lower fastening assembly 5. Two internally threaded lower threaded positioning blocks 53 are provided on the top of the lower fastening assembly 5.

[0029] Reference Figure 2 , four screw rods 43 are evenly distributed on the outer sides of the upper sealing cavity 4 and the lower sealing cavity 3, so that the upper and lower components stably clamp the pipeline and move towards the middle, fitting the cross-sections of the pipelines on both sides, and further optimizing the sealing effect.

[0030] Working principle of the present invention: In the initial installation stage, when the device is not put into the sea, air required for the designed depth is filled into the pressure regulating cavity 226 and the intermediate transition cavity 224. At this time, the support plate 213 is located at the middle position of the main support cavity 222, so as to be able to work normally after the device is fixed on the seabed. The fixing base plate 1 is fixed on the seabed at the set position through the fixing hole 11 by the fixing bolt. The upper sealing cavity 4 and the lower sealing cavity 3 of the device are in the locking stage, and the bolt 44 is in the highest state.

[0031] During the automatic leveling stage, after the fixed base plate 1 is fixed at the preset seabed position, the automatic height adjustment of the lower sealing cavity 3 and the upper sealing cavity 4 can be achieved through the flexible support 2 provided on the fixed base plate 1. Specifically, both ends of the flexible support 2 in the device are respectively connected to the bottom of the lower sealing cavity 3 and the top of the fixed base plate 1. Since the air required for this depth has been pre-charged into the pressure regulation cavity 226 and the upper vent hole 223 during the initial installation stage, the pressure regulation cavity 226 is made of rubber material, and the side of the pressure regulation cavity 226 is in direct contact with seawater through the pressure equalizing notch 228. When the height of the fixed base plate 1 is lower than that of other surrounding devices, the pressure regulation cavity 226 in the device is compressed under the action of seawater pressure, and the air pre-charged into the pressure regulation cavity 226 is squeezed and enters the internal of the intermediate transition cavity 224 through the vent hole 227. Since the intermediate transition cavity 224 is located in the inner wall area of the rod barrel 22, the excess gas inside the intermediate transition cavity 224 is squeezed and enters the internal of the main support cavity 222 through the upper vent hole 223 provided at the upper part of the intermediate transition cavity 224. Then, the gas inside the intermediate transition cavity 224 pushes the support plate 213 to move upward along the lower limit block 221. Under the push of the support plate 213, the shock absorption spring 212 moves upward, realizing the automatic adjustment of the length of the flexible support 2, and then realizing that adjacent devices are kept at the same height to the greatest extent. When the height of the fixed base plate 1 is higher than that of other surrounding devices, since the pressure inside the rod barrel 22 is higher than the seawater pressure at the location, the gas inside the main support cavity 222 and the intermediate transition cavity 224 is pressed into the elastically deformable pressure regulation cavity 226 through the lower vent hole 225. The pressure regulation cavity 226 can be appropriately deformed through the pressure equalizing notch 228 opened at the bottom of the rod barrel 22, so as to realize the lowering of the height of the support plate 213, making the fixed base plate 1 of the device at the same height as the surrounding, thus improving the adaptability of the device to seabeds of different heights, improving the installation efficiency of the device, and avoiding the problem of separately adjusting each device due to the change of seabed height.

[0032] In the pipeline fixing stage, the lower fastening assembly 5 of the device is at the maximum moving distance on both sides of the lower sealing cavity 3. The two unconnected subsea pipelines are placed on the lower sealing rubber ring 51 made of rubber. Subsequently, the lower sealing cavity 3 and the upper sealing cavity 4 are closely fitted. At the same time, the lower sealing rubber ring 51 and the upper sealing rubber ring 61 completely wrap the subsea pipelines on both sides, achieving the preliminary sealing effect on the pipelines on both sides. After the lower sealing cavity 3 and the upper sealing cavity 4 are closely fitted, the lower ring gear 33 and the upper ring gear 45 can be combined into a whole, and then the lower ring gear 33 and the upper ring gear 45 can perform circular motion under the guiding action of the limit block 331 and the ring tooth groove 313. When the pipelines on both sides are placed in the predetermined position, the lower sealing cavity 3 and the upper sealing cavity 4 can be locked and fixed by bolts 44. The bolts 44 are threadedly engaged through the threaded fixing holes 311 with internal threads, thereby locking the lower sealing cavity 3 and the upper sealing cavity 4. While locking, the mutual approaching effect of the lower fastening assembly 5 and the upper fastening assembly 6 of the device can be realized. Specifically, while the bolts 44 are locked, the driving effect of the bolts 44 on the upper ring gear 45 and the lower ring gear 33 can be realized. When the lower ring gear 33 and the upper ring gear 45 perform circular motion along the ring tooth groove 313, the (431) arranged on the screw 43 meshes with the teeth on the lower ring gear 33 and the upper ring gear 45, realizing the transmission of the rotational power of the bolts 44 to the screw 43. Through the cooperation of the threads on both sides of the screw 43 with the lower threaded positioning block 53 and the upper threaded positioning block 63 with internal threads, the screw 43 is driven to make the lower fastening assembly 5 and the upper fastening assembly 6 on both sides approach each other. The inner walls of the lower fastening assembly 5 and the upper fastening assembly 6 are provided with the lower sealing rubber ring 51 and the upper sealing rubber ring 61 that can slide with the upper sliding groove 34. Since the shapes of the lower sealing rubber ring 51 and the upper sealing rubber ring 61 are approximately fan-shaped, when the lower sealing cavity 3 and the upper sealing cavity 4 are separated, the lower fastening assembly 5 and the upper fastening assembly 6 can still maintain the positions designed on the lower sealing cavity 3 and the upper sealing cavity 4. While the bolts 44 lock the device, the lower sealing cavity 3 and the upper sealing cavity 4 form a closed cavity, and the lower fastening assembly 5 and the upper fastening assembly 6 jointly act to clamp the pipelines on both sides to approach each other. At the end of locking, the movement effect of the lower fastening assembly 5 and the upper fastening assembly 6 can realize the close fitting of the pipelines on both sides. Combining with the further sealing effect of the lower sealing cavity 3 and the upper sealing cavity 4, the connection of the pipelines is finally realized. When connecting the pipelines, there is not only the circumferential clamping force of the pipelines, but also the axial clamping force of the pipelines on both sides, which can achieve the double-sealing effect of the subsea pipelines, and at the same time save the connection time of the pipelines and simplify the connection operation.

[0033] After the pipeline is installed, the flexible support 2 provided plays a role in supporting and buffering the overall device. When the automatic leveling and pipeline connection are completed, the internal air of the shock-absorbing spring 212, the main support cavity 222 and the intermediate transition cavity 224 jointly cope with the influence of ocean currents and geological movements on the submarine pipeline, ensuring the normal operation of the submarine pipeline.

Claims

1. Flexible support for marine pipelines and installation structure of internal and external pipelines, including a fixed bottom plate (1), characterized in that: On the top of the fixed bottom plate (1), a flexible support base (12) is provided. In the middle of the flexible support base (12), a rod barrel (22) is provided. On the top of the rod barrel (22), a top rod (21) is provided. At the bottom of the top rod (21), a shock-absorbing spring (212) is fixedly connected. At the bottom of the shock-absorbing spring (212), a support plate (213) is fixedly connected. At the bottom of the rod barrel (22), an intermediate transition cavity (224) is opened. At the top of the intermediate transition cavity (224), an upper ventilation hole (223) is opened. On the side of the intermediate transition cavity (224), a lower ventilation hole (225) is opened. On the side of the lower ventilation hole (225), a ventilation hole (227) is connected. On the side of the ventilation hole (227), a pressure adjustment cavity (226) is provided. At the top of the top rod (21), a lower sealing cavity (3) is movably connected. At the top of the lower sealing cavity (3), an upper sealing cavity (4) is provided. At the upper part of the upper sealing cavity (4), a screw support base (42) is provided. In the middle of the screw support base (42), a screw (43) is provided. At the upper part of the upper sealing cavity (4), an upper ring gear (45) is provided. On both sides of the lower sealing cavity (3), lower fastening components (5) are provided. On both sides of the upper sealing cavity (4), upper fastening components (6) are provided.

2. The flexible support for marine pipelines and the installation structure of inner and outer pipelines according to claim 1, characterized in that: At the top end of the intermediate transition cavity (224), on the inner wall of the rod barrel (22), lower limit blocks (221) are opened. There are four lower limit blocks (221). At the bottom end of the top rod (21), an upper limit block (211) is provided. On the inner wall of the top end of the rod barrel (22), lower limit blocks (221) are provided.

3. The flexible support for marine pipelines and the installation structure of inner and outer pipelines according to claim 1, characterized in that: On the top of the fixed bottom plate (1), a flexible support base (12) is provided. Eight flexible support bases (12) are evenly distributed on the top of the fixed bottom plate (1). In the middle of the flexible support base (12), a rod barrel (22) is movably connected. Eight top rods (21) are respectively connected to the flexible support bases (12). At the bottom of the rod barrel (22), pressure equalizing notches (228) are opened. Two pressure equalizing notches (228) are arranged on the side of the pressure adjustment cavity (226).

4. The flexible support for marine pipelines and the installation structure of inner and outer pipelines according to claim 1, characterized in that: On the side of the lower sealing cavity (3), a lower fixing block (31) is provided. On the top of the lower fixing block (31), threaded fixing holes (311) are opened. Three threaded fixing holes (311) are arranged at the top end of the lower fixing block (31). At the interval of the threaded fixing holes (311), threaded power holes (312) are opened. Inside the lower fixing block (31), a ring gear groove (313) is opened. On the side of the ring gear groove (313), a lower ring gear (33) is provided. On the side of the lower ring gear (33), a limit block (331) is provided. There are two ring gear grooves (313) and limit blocks (331) respectively. At the bottom surface of the lower sealing cavity (3), a support base (32) is fixedly connected. On the inner side surface of the lower sealing cavity (3), upper sliding grooves (34) are provided. There are two upper sliding grooves (34).

5. The marine pipeline flexible support and the internal and external pipeline installation structure according to claim 4, characterized in that: The top of the lower sealing cavity (3) is provided with an upper sealing cavity (4). The upper fixing block (41) is arranged on the side surface of the upper sealing cavity (4) corresponding to the position of the lower fixing block (31). The top end of the upper fixing block (41) is threadedly connected with bolts (44). There are four bolts (44), and the bolts (44) are arranged at the top positions of the threaded fixing holes (311) and the threaded power holes (312). The top of the upper sealing cavity (4) is fixedly connected with a hollow screw support seat (42). The middle part of the screw support seat (42) is rotatably connected with a screw (43) with threads at both ends. The middle part of the screw (43) is provided with (431). The middle part of the upper sealing cavity (4) is provided with an upper ring gear (45). The inner side surface of the upper sealing cavity (4) is provided with a lower chute (46).

6. The flexible support for marine pipelines and the installation structure of inner and outer pipelines according to claim 3, characterized in that: The two side surfaces of the upper sealing cavity (4) are provided with upper fastening components (6). The inner side surface of the upper fastening components (6) is provided with upper sealing rubber rings (61). The top side surface of the upper fastening components (6) is fixedly connected with upper fastening component fixing blocks (62). The top of the upper fastening components (6) is provided with two internally threaded upper threaded positioning blocks (63).

7. The flexible support for marine pipelines and the installation structure of internal and external pipelines according to claim 1, characterized in that: The two side surfaces of the lower sealing cavity (3) are provided with lower fastening components (5). The inner side surface of the lower fastening components (5) is provided with lower sealing rubber rings (51). The bottom side surface of the lower fastening components (5) is fixedly connected with lower fastening component fixing blocks (52). The top of the lower fastening components (5) is provided with two internally threaded lower threaded positioning blocks (53).

8. The flexible support for marine pipelines and the installation structure of inner and outer pipelines according to claim 4, characterized in that: The four screws (43) are evenly distributed on the outer sides of the upper sealing cavity (4) and the lower sealing cavity (3).

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