LNG ship pump tower steel pipe correcting device

Abstract

According to the LNG ship pump tower steel pipe correcting device, a U-shaped supporting beam is fixed to the ground through a supporting column, a pump pipe fixing sleeve is arranged at the end of the free end of the U-shaped supporting beam and composed of a semicircular upper end reinforcing sleeve and a semicircular lower end fixing sleeve, and the upper end reinforcing sleeve and the lower end fixing sleeve are in butt joint to form a circular ring; the upper-end reinforcing sleeve and the lower-end fixing sleeve are fixedly connected through a fixing plate and a pin shaft, the fixing plate is vertically arranged and located at the butt joint position of the upper-end reinforcing sleeve and the lower-end fixing sleeve, the fixing plate and the upper-end reinforcing sleeve are connected through the pin shaft, the fixing plate and the lower-end fixing sleeve are connected through the pin shaft, and the emergency pump pipe is located in the pump pipe fixing sleeve. The bending problem possibly occurring in the manufacturing process of the pump tower main pipeline steel pipe is solved, and the quality of a pump tower product is remarkably improved through the accurate correcting device. And meanwhile, by applying the technology, the manufacturing efficiency and quality of the pump tower main pipeline are also greatly improved, and a more reliable guarantee is provided for construction of an LNG (Liquefied Natural Gas) ship.

Description

Technical Field

[0001] The present invention belongs to the field of shipbuilding and design, and particularly relates to a steel pipe straightening device for an LNG ship pump tower. Background Art

[0002] The technology of the steel pipe straightening device for the LNG ship pump tower is used to solve the problems that during the assembly and welding of the main structure of the LNG ship pump tower, due to the dimensional deviation of the purchased materials and the difference in the operation level of the operators, the straightness of the main pipeline steel pipe of the pump tower and the ovality accuracy of the pipe exceed the standard. This technology requires that within the length of the main pipeline steel pipe of the pump tower of about 30 meters, the straightness of the pipe is controlled within ±5 mm to ensure that the built pump tower product fully meets the process requirements of the drawing. Summary of the Invention

[0003] To solve the above problems, the present invention provides a steel pipe straightening device for an LNG ship pump tower, and the technical solution adopted is as follows:

[0004] A steel pipe straightening device for an LNG ship pump tower has a U-shaped support beam. The U-shaped support beam is fixed to the ground through support columns. At the end of the free end of the U-shaped support beam, there is a pump pipe fixing sleeve. The pump pipe fixing sleeve is composed of a semi-circular upper strengthening sleeve and a semi-circular lower fixing sleeve. The upper strengthening sleeve and the lower fixing sleeve are butted to form a ring. The upper strengthening sleeve and the lower fixing sleeve are connected and fixed through a fixing plate and a pin shaft. The fixing plate is vertically arranged at the butting position of the upper strengthening sleeve and the lower fixing sleeve. The fixing plate is connected to the upper strengthening sleeve through a pin shaft, and the fixing plate is connected to the lower fixing sleeve through a pin shaft. The emergency pump pipe is located within the pump pipe fixing sleeve.

[0005] A hydraulic jack is fixed at the center of the U-shaped support beam. A strengthening seat is fixed at the end of the hydraulic jack, and the strengthening seat is in contact with the outer surface of the emergency pump pipe.

[0006] For the above-mentioned steel pipe straightening device for an LNG ship pump tower, further, the bottom of the support column is welded to the ground reinforcement or the horizontal tread.

[0007] For the above-mentioned steel pipe straightening device for an LNG ship pump tower, further, the hydraulic jack is a 200-ton hydraulic jack.

[0008] For the above-mentioned steel pipe straightening device for an LNG ship pump tower, further, the pump pipe fixing sleeve is connected to the U-shaped support beam through a pin shaft.

[0009] For the above-mentioned steel pipe straightening device for an LNG ship pump tower, further, four support columns are arranged below the U-shaped support beam, and one support column is arranged below the hydraulic jack.

[0010] For the above-mentioned steel pipe straightening device for an LNG ship pump tower, further, the inner diameter of the pump pipe fixing sleeve is φ652 or φ448.

[0011] The present invention not only solves the possible bending problem of the steel pipe of the main pipeline of the pump tower during the manufacturing process, but also significantly improves the quality of the pump tower products through an accurate correction device. The design and manufacturing process of this correction device requires high professional knowledge and skills, so it has a high technical content. At the same time, the application of this technology also greatly improves the efficiency and quality of the manufacturing of the main pipeline of the pump tower, providing a more reliable guarantee for the construction of LNG ships.

[0012] In addition, the application of the present invention also has wide popularizability, which can provide effective reference for the manufacturing of large-diameter stainless steel pipes with other similar structures. This further proves the practicality and importance of this technology in the field of pump tower manufacturing, and it is one of the important directions for the future development of the pump tower manufacturing industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic top view structure diagram of the present invention;

[0014] Figure 2 is a schematic side view structure diagram of the present invention;

[0015] Among them, 1-U-shaped support beam, 2-hydraulic jack, 3-pin shaft, 4-strengthening seat, 5-lower end fixing sleeve, 6-upper end strengthening sleeve, 7-emergency pump pipe, 8-support column. DETAILED DESCRIPTION OF THE INVENTION

[0016] The present invention will be further described below with reference to the drawings.

[0017] As Figure 1 , 2 shown, an LNG ship pump tower steel pipe correction device has a U-shaped support beam. The U-shaped support beam is fixed to the ground through support columns, and the bottom of the support columns is welded to the ground bars or the horizontal tire surface. A pump pipe fixing sleeve is arranged at the end of the free end of the U-shaped support beam. The pump pipe fixing sleeve is connected to the U-shaped support beam through a pin shaft. The pump pipe fixing sleeve is composed of a semi-circular upper end strengthening sleeve and a semi-circular lower end fixing sleeve. The upper end strengthening sleeve and the lower end fixing sleeve are butted to form a ring. The upper end strengthening sleeve and the lower end fixing sleeve are connected and fixed through a fixing plate and a pin shaft. The fixing plate is vertically arranged at the butting position of the upper end strengthening sleeve and the lower end fixing sleeve. The fixing plate is connected to the upper end strengthening sleeve through a pin shaft, and the fixing plate is connected to the lower end fixing sleeve through a pin shaft. The emergency pump pipe is located inside the pump pipe fixing sleeve.

[0018] A 200-ton hydraulic jack is fixed at the center of the U-shaped support beam, and a strengthening seat is fixed at the end of the hydraulic jack, and the strengthening seat is in contact with the outer surface of the emergency pump pipe.

[0019] Taking the correction of the emergency pump pipe with a specification of φ610*12.7 or the main pump pipe with a specification of φ406.4*12.7 as an example:

[0020] Then, use a special pipe-hoisting tooling and a crane to place the emergency pump pipe or the main pump pipe horizontally on the lower fixing sleeve, and then install the upper strengthening sleeve. Connect the upper strengthening sleeve and the lower fixing sleeve using connecting plates and pins. Subsequently, mark the theoretical inspection lines at four quadrants 150 mm away from the pump pipe, straighten them with steel wires, and then use a 200-range vernier caliper to measure the distance between the pipe wall and the theoretical inspection lines. If the tolerance is greater than ±2 mm, the crane and the operator slowly shift the pump pipe. After the position is fixed and the surrounding area is confirmed to be safe, start the hydraulic jack, and the strengthening seat slowly pushes against the protruding part of the pump pipe. During the pushing process, constantly measure the actual distance between the pipe wall and the inspection line. Stop the pushing when it is within the allowable tolerance range. Keep the pushing process for 5 minutes to consolidate the correction effect, and then measure whether the straightness deviation of the pipe meets the requirements. If it does not meet the requirements, continue the pushing correction until it is qualified. After completion, find the next out-of-tolerance point. After correcting the 6-meter pipe, replace the next pump pipe for the correction work.

Claims

1. An LNG ship pump tower steel pipe correction device, characterized in that There is a U-shaped support beam (1), which is fixed to the ground by support columns (8). At the end of the free end of the U-shaped support beam, there is a pump pipe fixing sleeve, which is composed of a semi-circular upper strengthening sleeve (6) and a semi-circular lower fixing sleeve (5). The upper strengthening sleeve and the lower fixing sleeve are butted to form a ring, and the upper strengthening sleeve and the lower fixing sleeve are connected and fixed by a fixing plate and a pin shaft (3). The fixing plate is vertically arranged at the butting place of the upper strengthening sleeve and the lower fixing sleeve. The fixing plate is connected to the upper strengthening sleeve by a pin shaft, and the fixing plate is connected to the lower fixing sleeve by a pin shaft. The emergency pump pipe (7) is located within the pump pipe fixing sleeve; A hydraulic jack (2) is fixed at the center of the U-shaped support beam, and a strengthening seat (4) is fixed at the end of the hydraulic jack, and the strengthening seat is in contact with the outer surface of the emergency pump pipe.

2. The steel pipe straightening device for the pump tower of an LNG ship according to claim 1, characterized in that, The bottom of the support column is welded to the ground reinforcement or the horizontal tread surface.

3. The steel pipe straightening device for the pump tower of an LNG ship according to claim 1, characterized in that, The hydraulic jack is a 200-ton hydraulic jack.

4. The steel pipe straightening device for the pump tower of an LNG ship according to claim 1, characterized in that, The pump pipe fixing sleeve is connected to the U-shaped support beam by a pin shaft.

5. A steel pipe straightening device for the pump tower of an LNG ship according to claim 1, characterized in that, There are four support columns arranged below the U-shaped support beam, and there is one support column arranged below the hydraulic jack.

6. A steel pipe straightening device for the pump tower of an LNG ship according to claim 1, characterized in that, The inner diameter of the pump pipe fixing sleeve is φ652 or φ448.

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