An offshore steel horizontal elbow assembly welding platform

Abstract

The present invention discloses an offshore steel horizontal bend pipe group welding platform, comprising: a base, a bend pipe locking mechanism and a straight pipe locking mechanism; the base can float on the sea surface; the bend pipe locking mechanism comprises a first support seat, a clamping mechanism, a driving mechanism and a limiting mechanism, the first support seat is fixedly connected to the upper side of the base and is used to support the bend pipe, the first support seat is provided with a mounting groove, and the driving mechanism is installed in the mounting groove; the straight pipe locking mechanism comprises two second support seats for supporting the straight pipe, the two second support seats are installed on the upper side of the base and close to the two ends of the first support seat, the upper side of the second support seat is provided with a threaded hole, and the straight pipe locking mechanism also includes a clamp, which can be locked on the threaded hole by a fastener to lock the straight pipe on the second support seat; the present invention proposes an offshore steel horizontal bend pipe group welding platform, when the angle of the welding platform is adjusted, the welding platform shakes less, thereby improving the construction efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline construction, and in particular to an offshore steel horizontal elbow assembly welding platform. Background Art

[0002] The pipeline is bent under the sea through a circular elbow. Specifically, the circular elbow is a horizontally placed steel circular elbow, such as Figure 8 , two straight pipes 91 are connected by an arc-shaped curved pipe 92, and the angles of the curved pipes are different, and the central angles of the arc-shaped curved pipes are different; in the existing underwater pipeline construction, a welding platform is used to lock the straight pipe and the curved pipe, and the straight pipe and the curved pipe are assembled, that is, the pipe openings of the straight pipe and the pipe openings of the curved pipe are aligned and locked, so as to manually weld the pipeline at sea. The existing welding platform includes a base floating on the sea surface, a straight pipe locking mechanism and a curved pipe locking mechanism, and the straight pipe locking mechanism and the curved pipe locking mechanism are both installed on the base.

[0003] During construction, the lifting device lifts one of the straight pipes in the sea, and the bent pipe is locked on the base floating on the sea through the bent pipe locking mechanism. The transport ship drags the welding platform to the bottom of the straight pipe end. After the lifting device lowers the straight pipe to the base, it locks the straight pipe on the base through the straight pipe locking mechanism, and the straight pipe mouth is manually welded to one end of the bent pipe. When welding the straight pipe on the other side, the straight pipe locking mechanism and the bent pipe locking mechanism are loosened, and the transport ship drags the welding platform, adjusts the angle of the welding platform, and locks the bent pipe on the base again. Then, the other straight pipe is locked on the base through the straight pipe locking mechanism, and the straight pipe mouth is manually welded to the other end of the bent pipe. At this point, the elbow welding is completed, and finally the transport ship drags the welding platform away from the welding site.

[0004] In summary, when welding the straight pipe on the other side, the existing technology requires a transport ship to tow the welding platform and adjust the angle of the welding platform. During the adjustment, the transport ship is prone to shaking due to the influence of waves, etc., making it difficult to control the movement of the welding platform. It often takes multiple adjustments to adjust it into place, affecting construction efficiency. Summary of the invention

[0005] In order to solve the shortcoming of the prior art that the welding platform is easy to shake when the angle of the welding platform is adjusted, thereby affecting the construction efficiency, the present invention proposes an offshore steel horizontal bend pipe assembly for the welding platform. When the angle of the welding platform is adjusted, the welding platform shakes less, thereby improving the construction efficiency.

[0006] To achieve the above object, the present invention adopts the following technical solution:

[0007] A offshore steel horizontal elbow group welding platform, comprising: a base, an elbow locking mechanism and a straight pipe locking mechanism; the base can float on the sea surface; the elbow locking mechanism comprises a first support seat, a clamping mechanism, a driving mechanism and a limiting mechanism, the first support seat is fixedly connected to the upper side of the base and is used to support the elbow, the clamping mechanism is installed on the upper side of the limiting mechanism, and can clamp or loosen the upper side of the elbow, the first support seat is provided with a mounting groove, the driving mechanism is installed in the mounting groove, the limiting mechanism is installed on the upper side of the first support seat, and is used to support the inner and outer peripheries of the elbow, the driving mechanism can move along the elbow to make the welding platform rotate around the center of the elbow; the straight pipe locking mechanism comprises two second support seats for supporting the straight pipe, the two second support seats are installed on the upper side of the base and close to the two ends of the first support seat, the upper side of the second support seat is flush with the upper side of the first support seat, the upper side of the second support seat is provided with a threaded hole, and the straight pipe locking mechanism also includes a clamp, which can be locked on the threaded hole by a fastener to lock the straight pipe on the second support seat;

[0008] The elbow is provided with a first state and a second state on the elbow locking mechanism. When the elbow is in the first state, one end of the elbow is close to one of the second support seats and is coaxially paired with the straight tube on the second support seat. When the elbow is in the second state, the other end of the elbow is close to another second support seat and is coaxially paired with the straight tube on the second support seat.

[0009] Through the above arrangement, firstly, when welding the straight pipe on the other side of the elbow, the driving mechanism drives the welding platform to rotate, the movement of the welding platform is more stable, and the welding platform can be adjusted into place more quickly, thereby improving the construction efficiency; secondly, it is suitable for the welding of elbows with various central angles, which can reduce the number of welding platforms in the project, facilitate project management, and reduce construction costs.

[0010] Furthermore, the limiting mechanism includes a plurality of inner guide rollers and a plurality of outer guide rollers, wherein the plurality of inner guide rollers are vertically rotatably connected to the upper side of the first support seat and are used to support the inner circumference of the bent pipe, and the plurality of outer guide rollers are vertically rotatably connected to the upper side of the first support seat and are used to support the outer circumference of the bent pipe.

[0011] Through the above arrangement, the inner guide roller and the outer guide roller reduce the movement resistance of the driving mechanism.

[0012] Furthermore, the limiting mechanism also includes a rotating shaft, which is vertically fixedly connected to the upper side of the first support seat, the inner guide roller and the outer guide roller are coaxially rotatably connected to the corresponding rotating shaft, and the upper end of the rotating shaft is provided with an external thread;

[0013] The clamping mechanism includes a support plate, an extrusion roller and a nut. The extrusion roller is rotatably connected to the lower side of the support plate. The upper end of the rotating shaft passes through the support plate. The nut is threadedly connected to the upper end of the rotating shaft and contacts the upper side of the support plate. The nut is tightened to allow the extrusion roller to clamp the upper side of the bent pipe.

[0014] Through the above arrangement, first, the inner guide roller is rotatably connected to the first support seat through the rotating shaft, and the outer guide roller is rotatably connected to the first support seat through the rotating shaft. Second, the squeezing roller can be controlled by the nut to tighten or loosen the bent pipe. Third, the squeezing roller can further reduce the movement resistance of the driving mechanism.

[0015] Furthermore, the driving mechanism includes a hydraulic cylinder, a bracket, a driving roller and a motor. The hydraulic cylinder is vertically installed in the mounting groove, the bracket is installed at the upper end of the hydraulic cylinder, the driving roller and the motor are both installed on the bracket, the driving roller can contact the lower side of the bent pipe, and the motor can drive the driving roller to make the bent pipe move along the first support seat.

[0016] Through the above settings, the movement stability of the welding platform is improved.

[0017] Furthermore, a slide groove is provided on the upper side of the base, and the second support seat is slidably connected in the slide groove. The welding platform also includes a jacking device that can drive the second support seat to move along the slide groove so that the straight pipe on the second support seat is axially close to or away from the bend pipe mouth.

[0018] Through the above arrangement, the distance between the pipe opening of the straight pipe and the pipe opening of the bent pipe can be controlled by the jacking device, thereby further improving the construction efficiency.

[0019] Furthermore, an inner protrusion and an outer protrusion are fixedly connected to the upper side of the first support seat, and a limiting groove is formed between the inner protrusion, the outer protrusion and the first support seat. When the first support seat supports the bent pipe, the limiting groove fits the lower side of the bent pipe.

[0020] Through the above arrangement, after the bent pipe is pressed against the first support seat, the contact area between the first support seat and the bent pipe is larger, thereby preventing relative sliding between the bent pipe and the first support seat.

[0021] Further, when using the welding platform to weld the bent pipe, the specific steps are as follows:

[0022] Step a, the lifting device lifts the bent pipe onto the first support seat, and the pressing mechanism presses the bent pipe onto the first support seat;

[0023] Step b, the lifting device lifts one of the straight pipes, and the transport vessel drags the welding platform to below the end of the straight pipe;

[0024] Step c, the lifting device lowers the straight pipe so that the end of the straight pipe rests on one of the second support seats, and the straight pipe is locked on the second support seat by a clamp, and the bent pipe is in the first state;

[0025] Step d, manually welding the mouth of the straight pipe to one end of the bent pipe;

[0026] Step e, remove the clamp, the clamping mechanism loosens the bent pipe, the driving mechanism moves along the bent pipe, the welding platform rotates around the center of the bent pipe on the sea surface, so that the end of the bent pipe is close to another second support seat, the clamping mechanism presses the bent pipe on the first support seat again, the lifting device places the end of the other straight pipe on the second support seat, and locks it with the clamp. The bent pipe is in the second state, and the straight pipe is manually welded to the bent pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A side view of a welding platform according to an embodiment.

[0028] Figure 2 A top view of a welding platform according to an embodiment.

[0029] Figure 3 for Figure 1 AA section view.

[0030] Figure 4 Schematic diagram of the first state of the bent pipe.

[0031] Figure 5 for Figure 4 BB cross-sectional view.

[0032] Figure 6 It is a schematic diagram of the driving mechanism moving along the curved pipe.

[0033] Figure 7 Schematic diagram of the second state of the bent pipe.

[0034] Figure 8 This is a schematic diagram of welding existing curved pipes and straight pipes together. DETAILED DESCRIPTION

[0035] The technical solution of the present invention is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0036] See also Figures 1 to 7, an offshore steel horizontal elbow group welding platform, comprising: a base 2, an elbow locking mechanism 3 and a straight pipe locking mechanism 4; the base 2 can float on the sea surface; the elbow locking mechanism 3 comprises a first support seat 31, a clamping mechanism 32, a driving mechanism 33 and a limiting mechanism 34, the first support seat 31 is fixedly connected to the upper side of the base 2 and is used to support the elbow 5, the clamping mechanism 32 is installed on the upper side of the limiting mechanism 34, and can clamp or loosen the upper side of the elbow 5; wherein the elbow 5 is made of stainless steel, the elbow 5 is placed horizontally and is curved in an arc shape; an installation groove 311 is provided on the first support seat 31, the driving mechanism 33 is installed in the installation groove 311, the limiting mechanism 34 is installed in the installation groove 311, and the driving mechanism 33 is installed in the installation groove 311. The mechanism 34 is installed on the upper side of the first support seat 31 and is used to support the inner and outer peripheries of the bent pipe 5. The driving mechanism 33 can move along the bent pipe 5 so that the welding platform rotates around the center of the bent pipe 5. The straight pipe locking mechanism 4 includes two second support seats 41 for supporting the straight pipe 6. The two second support seats 41 are installed on the upper side of the base 2 and close to the two ends of the first support seat 31. The upper side of the second support seat 41 is flush with the upper side of the first support seat 31. The upper side of the second support seat 41 is provided with a threaded hole 411. The straight pipe locking mechanism 4 also includes a hoop 42. The hoop 42 can be locked on the threaded hole 411 by a fastener to lock the straight pipe 6 on the second support seat 41;

[0037] The elbow 5 is provided with a first state and a second state on the elbow locking mechanism 3. When the elbow 5 is in the first state, one end of the elbow 5 is close to one of the second support seats 41 and is coaxially paired with the straight tube 6 on the second support seat 41. When the elbow 5 is in the second state, the other end of the elbow 5 is close to another second support seat 41 and is coaxially paired with the straight tube 6 on the second support seat 41; wherein, when the end of the elbow is coaxially paired with the corresponding straight tube, the end of the elbow is coaxial with the corresponding straight tube, the pipe mouth of the elbow is opposite to the pipe mouth of the straight tube, and the spacing meets the welding requirements.

[0038] Through the above arrangement, firstly, when welding the straight pipe 6 on the other side of the elbow 5, the driving mechanism 33 drives the welding platform to rotate, the movement of the welding platform is more stable, and the welding platform can be adjusted to the right position more quickly, thereby improving the construction efficiency; secondly, it is suitable for the welding of elbows 5 with various central angles, which can reduce the number of welding platforms in the project, facilitate project management, and reduce construction costs.

[0039] When using the welding platform to weld the elbow 5, the specific steps are as follows:

[0040] Step a, the lifting device lifts the bent pipe 5 onto the first support seat 31, and the pressing mechanism 32 presses the bent pipe 5 onto the first support seat 31; for details, refer to Figure 4 and Figure 5, one end of the bent pipe 5 is placed flat on the first support seat 31 and faces one of the second support seats 41, and the other end of the bent pipe 5 is placed on the other second support seat 41, and the pressing mechanism 32 presses the bent pipe 5 on the first support seat 31, and under the action of the friction force between the first support seat 31 and the bent pipe 5, the bent pipe 5 is locked on the first support seat 31;

[0041] Step b, the lifting device lifts one of the straight pipes 6, and the transportation ship drags the welding platform to below the end of the straight pipe 6; specifically, the lifting device can use an operating ship with a crane to lift the end of the straight pipe 6 in the sea off the sea surface, and the transportation ship drags the welding platform to below the end of the straight pipe 6, and one of the second support seats 41 moves to below the end of the straight pipe 6;

[0042] Step c, the lifting device lowers the straight pipe 6 so that the end of the straight pipe 6 rests on one of the second support seats 41, the clamp 42 is buckled on the upper side of the straight pipe 6, and the two ends of the clamp 42 are locked on the threaded holes 411 using fasteners to lock the straight pipe 6 on the second support seat 41, and the bent pipe 5 is in the first state; refer to Figure 4 After the straight pipe 6 is lowered onto the second support seat 41, the straight pipe 6 is coaxial with the pipe opening of the curved pipe 5, and the end of the straight pipe 6 is locked on the second support seat 41 by using a clamp 42, so that the positions of the pipe openings of the straight pipe 6 and the pipe openings of the curved pipe 5 are fixed;

[0043] Step d, manually welding the mouth of the straight pipe 6 to one end of the curved pipe 5;

[0044] Step e, remove the clamp 42, the clamping mechanism 32 releases the bent pipe 5, the driving mechanism 33 moves along the bent pipe 5, the welding platform rotates around the center of the bent pipe 5 on the sea surface, so that the end of the bent pipe 5 is close to another second support seat 41, the clamping mechanism 32 presses the bent pipe 5 on the first support seat 31 again, the lifting device places the end of another straight pipe 6 on the second support seat 41, and uses the clamp 42 to lock it, the bent pipe 5 is in the second state, and the straight pipe 6 is manually welded to the bent pipe 5; After the clamp 42 is removed, the welded straight pipe 6 is released from the second support seat 41, the clamping mechanism 32 releases the bent pipe 5, and the bent pipe 5 is released from the first support seat 31, but the limiting mechanism 34 is still in contact with the inner and outer peripheries of the bent pipe 5, and the driving mechanism 33 moves along the bent pipe 5 toward the other end of the bent pipe 5. At this time, the bent pipe 5 has been welded to one of the straight pipes 6, and the positions of the straight pipe 6 and the bent pipe 5 on the sea surface are fixed. When the driving mechanism 33 moves, the welding platform will rotate around the center of the bent pipe 5, see Figure 7After the other end of the bent pipe 5 approaches another second support seat 41, the clamping mechanism 32 presses the bent pipe 5 against the first support seat 31 again to fix the position of the bent pipe 5, and the lifting device lifts another straight pipe 6, and places the end of the straight pipe 6 on the second support seat 41, buckles the clamp 42 on the upper side of the straight pipe 6, and uses fasteners to lock the two ends of the clamp 42 in the threaded hole 411 to lock the straight pipe 6 on the second support seat 41. At this time, the bent pipe 5 is in the second state, and the end of the bent pipe 5 is coaxial with the straight pipe 6. The welder is used manually to weld the bent pipe 5 and the straight pipe 6 together, so that the welding of the two ends of the bent pipe 5 is completed. Finally, after the clamp 42 is removed, the clamping mechanism 32 is removed from the upper side of the bent pipe 5, and the transportation ship drags the base 2 away from under the bent pipe 5 and the straight pipe 6, and the lifting device lowers the welded bent pipe 5 and the straight pipe 6 to the sea.

[0045] During the above welding process, after welding the straight pipe on one side, the driving mechanism is used to adjust the angle of the welding platform. During the adjustment, the welding platform moves along the curved pipe 5. The welding platform is more stable and is basically not affected by waves, so that the welding platform can be more adjusted to the right position, thereby improving the construction efficiency.

[0046] As an implementation method, the limiting mechanism 34 includes a plurality of inner guide rollers 341 and a plurality of outer guide rollers 342. The plurality of inner guide rollers 341 are vertically rotatably connected to the upper side of the first support seat 31 and are used to support the inner periphery of the bent pipe 5. The plurality of outer guide rollers 342 are vertically rotatably connected to the upper side of the first support seat 31 and are used to support the outer periphery of the bent pipe 5.

[0047] Through the above arrangement, the inner guide roller 341 and the outer guide roller 342 reduce the movement resistance of the driving mechanism 33 .

[0048] In the present application, when the bent pipe 5 is placed on the first support seat 31, the inner guide roller 341 contacts the inner circumference of the bent pipe 5, and the outer guide roller 342 contacts the outer circumference of the bent pipe 5. When the driving mechanism 33 moves along the bent pipe 5, the inner guide roller 341 and the outer guide roller 342 rotate, causing the welding platform to rotate around the center of the bent pipe 5.

[0049] As an implementation method, the limiting mechanism 34 also includes a rotating shaft 343, which is vertically fixedly connected to the upper side of the first support seat 31, and the inner guide roller 341 and the outer guide roller 342 are coaxially rotatably connected to the corresponding rotating shaft 343, and the upper end of the rotating shaft 343 is provided with an external thread;

[0050] The clamping mechanism 32 includes a support plate 321, a squeezing roller 322 and a nut 323. The squeezing roller 322 is rotatably connected to the lower side of the support plate 321. The upper end of the rotating shaft 343 passes through the support plate 321. The nut 323 is threadedly connected to the upper end of the rotating shaft 343 and contacts the upper side of the support plate 321. The nut 323 is tightened to allow the squeezing roller 322 to clamp the upper side of the bent pipe 5.

[0051] Through the above arrangement, first, the inner guide roller 341 is rotatably connected to the first support seat 31 through the rotating shaft 343, and the outer guide roller 342 is rotatably connected to the first support seat 31 through the rotating shaft 343; second, the squeezing roller 322 can be controlled by the nut 323 to tighten or loosen the bent pipe 5; third, the squeezing roller 322 can further reduce the movement resistance of the driving mechanism 33.

[0052] In the present application, when the nut 323 is tightened, the nut 323 presses the bent pipe 5 onto the first support seat 31 through the support plate 321 and the squeezing roller 322; when the nut 323 is loosened, the squeezing roller 322 loosens the bent pipe 5, thereby loosening the bent pipe 5 and the first support seat 31, making it easier for the driving mechanism 33 to move along the bent pipe 5.

[0053] As an implementation method, the driving mechanism 33 includes a hydraulic cylinder 331, a bracket 332, a driving roller 333 and a motor 334. The hydraulic cylinder 331 is vertically installed in the installation groove 311, the bracket 332 is installed at the upper end of the hydraulic cylinder 331, the driving roller 333 and the motor 334 are both installed on the bracket 332, the driving roller 333 can contact the lower side of the curved pipe 5, and the motor 334 can drive the driving roller 333 to make the curved pipe 5 move along the first support seat 31.

[0054] Through the above settings, the movement stability of the welding platform is improved.

[0055] In the present application, in step a, the driving roller 333 is disengaged from the bent pipe 5; in step e, the nut 323 is loosened to loosen the bent pipe 5 from the first support seat 31, and the hydraulic cylinder 331 drives the driving roller 333 upward to contact the bent pipe 5, and the extrusion roller 322 and the driving roller 333 clamp the upper and lower sides of the bent pipe 5 to prevent the welding platform from moving up and down during movement. A rubber layer can be provided on the outer side of the driving roller 333 to increase the friction between the driving roller 333 and the bent pipe 5. When the motor 334 drives the driving roller 333 to rotate, the welding platform rotates around the center of the bent pipe 5, wherein the motor 334 can be connected to the driving roller 333 through a reducer to increase the torque of the motor 334. In addition, the motor 334 can adopt a servo motor with angle feedback to improve the movement accuracy of the motor 334.

[0056] As an implementation method, a slide groove 21 is provided on the upper side of the base 2, and the second support seat 41 is slidably connected in the slide groove 21. The welding platform also includes a jacking device (not shown in the figure) that can drive the second support seat 41 to move along the slide groove 21 so that the straight pipe 6 on the second support seat 41 is axially close to or away from the pipe mouth of the curved pipe 5.

[0057] Through the above arrangement, the distance between the pipe opening of the straight pipe 6 and the pipe opening of the curved pipe 5 can be controlled by the jacking device, thereby further improving the construction efficiency.

[0058] In the present application, when the straight pipe 6 is fixed on the second support seat 41, the extension direction of the chute 21 is parallel to the straight pipe 6. In step b and step e, after the straight pipe 6 is locked on the second support seat 41, if the pipe opening of the straight pipe 6 and the pipe opening of the curved pipe 5 are too large or too small, the jacking device can drive the second support seat 41 and the chute 21 to slide relative to each other, so that the straight pipe 6 is close to or away from the curved pipe 5, so that the distance between the pipe opening of the straight pipe 6 and the pipe opening of the curved pipe 5 is suitable for welding. The jacking device can be purchased from the market.

[0059] As an implementation method, the upper side of the first support seat 31 is fixedly connected with an inner protrusion 312 and an outer protrusion 313, and a limiting groove 7 is formed between the inner protrusion 312, the outer protrusion 313 and the first support seat 31. When the first support seat 31 supports the bent pipe 5, the limiting groove fits the lower side of the bent pipe 5.

[0060] Through the above arrangement, after the curved pipe 5 is pressed against the first support seat 31 , the contact area between the first support seat 31 and the curved pipe 5 is larger, thereby preventing the curved pipe 5 and the first support seat 31 from sliding relative to each other.

[0061] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. An offshore steel horizontal elbow assembly welding platform, characterized in that: include: A base, wherein the base can float on the sea surface; The elbow locking mechanism comprises a first support seat, a clamping mechanism, a driving mechanism and a limiting mechanism, wherein the first support seat is fixedly connected to the upper side of the base and is used to support the elbow, the clamping mechanism is installed on the upper side of the limiting mechanism and can clamp or loosen the upper side of the elbow, the first support seat is provided with a mounting groove, the driving mechanism is installed in the mounting groove, the limiting mechanism is installed on the upper side of the first support seat and is used to support the inner and outer peripheries of the elbow, and the driving mechanism can move along the elbow to make the welding platform rotate around the center of the elbow; A straight tube locking mechanism, the straight tube locking mechanism comprising two second support seats for supporting the straight tube, the two second support seats being mounted on the upper side of the base and close to the two ends of the first support seat, the upper side of the second support seat being flush with the upper side of the first support seat, the upper side of the second support seat being provided with a threaded hole, the straight tube locking mechanism further comprising a clamp, the clamp being able to be locked on the threaded hole by a fastener to lock the straight tube on the second support seat; The bent pipe is provided with a first state and a second state on the bent pipe locking mechanism. When the bent pipe is in the first state, one end of the bent pipe is close to one of the second support seats and is coaxially paired with the straight pipe on the second support seat. When the bent pipe is in the second state, the other end of the bent pipe is close to another second support seat and is coaxially paired with the straight pipe on the second support seat.

2. The offshore steel horizontal elbow assembly welding platform according to claim 1, characterized in that: The limiting mechanism includes a plurality of inner guide rollers and a plurality of outer guide rollers, wherein the plurality of inner guide rollers are vertically rotatably connected to the upper side of the first support seat and are used to support the inner circumference of the bent pipe, and the plurality of outer guide rollers are vertically rotatably connected to the upper side of the first support seat and are used to support the outer circumference of the bent pipe.

3. The offshore steel horizontal elbow assembly welding platform according to claim 2 is characterized in that: The limiting mechanism further includes a rotating shaft, which is vertically fixedly connected to the upper side of the first supporting seat, the inner guide roller and the outer guide roller are both coaxially rotatably connected to the corresponding rotating shaft, and the upper end of the rotating shaft is provided with an external thread; The clamping mechanism includes a support plate, an extrusion roller and a nut. The extrusion roller is rotatably connected to the lower side of the support plate. The upper end of the rotating shaft passes through the support plate. The nut is threadedly connected to the upper end of the rotating shaft and contacts the upper side of the support plate. The nut is tightened to allow the extrusion roller to press the upper side of the bent pipe.

4. The offshore steel horizontal elbow assembly welding platform according to claim 3 is characterized in that: The driving mechanism includes a hydraulic cylinder, a bracket, a driving roller and a motor. The hydraulic cylinder is vertically installed in the mounting groove, the bracket is installed at the upper end of the hydraulic cylinder, the driving roller and the motor are both installed on the bracket, the driving roller can contact the lower side of the bent pipe, and the motor can drive the driving roller to make the bent pipe move along the first support seat.

5. The offshore steel horizontal elbow assembly welding platform according to claim 1, characterized in that: A slide groove is arranged on the upper side of the base, and the second support seat is slidably connected in the slide groove. The welding platform also includes a pushing device which can drive the second support seat to move along the slide groove so that the straight pipe on the second support seat is axially close to or away from the elbow pipe mouth.

6. The offshore steel horizontal elbow assembly welding platform according to claim 1, characterized in that: An inner protrusion and an outer protrusion are fixedly connected to the upper side of the first support seat, and a limiting groove is formed between the inner protrusion, the outer protrusion and the first support seat. When the first support seat supports the bent pipe, the limiting groove fits the lower side of the bent pipe.

7. The offshore steel horizontal elbow assembly welding platform according to claim 1, characterized in that: When using the welding platform to weld a bent pipe, the specific steps are as follows: Step a, the lifting device lifts the bent pipe onto the first support seat, and the pressing mechanism presses the bent pipe onto the first support seat; Step b, the lifting device lifts one of the straight pipes, and the transport vessel drags the welding platform to below the end of the straight pipe; Step c, lowering the straight pipe with a lifting device so that the end of the straight pipe rests on one of the second support seats, locking the straight pipe on the second support seat by a clamp, and the bent pipe is in the first state; Step d, manually welding the mouth of the straight pipe to one end of the bent pipe; Step e, remove the clamp, the clamping mechanism releases the bent pipe, the driving mechanism moves along the bent pipe, the welding platform rotates around the center of the bent pipe on the sea surface, so that the end of the bent pipe is close to the other second support seat, the clamping mechanism presses the bent pipe on the first support seat again, the lifting device places the end of the other straight pipe on the second support seat and locks it with the clamp, the bent pipe is in the second state, and the straight pipe is manually welded to the bent pipe.

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