Method for dismantling temporary tool parts for shipbuilding

Abstract

The invention relates to the technical field of maritime work equipment, in particular to a temporary tool part dismantling method for shipbuilding, which comprises a class A dismantling method, a class C dismantling method and a class D. The class A dismantling method comprises the following specific steps: A1, marking a cutting line of a tool part; a2, cutting off the root of the tool part according to the cutting line; a3, after the reserved roots are cut off, the cutting positions are planed; a4, performing repair welding on the surface defects; and A5, finally, smooth polishing operation is conducted. The FPSO ship body temporary workpiece dismantling method solves the problem that a ship body may be damaged during dismantling due to the fact that only a single dismantling method is adopted for dismantling temporary workpieces of a traditional ship body, that is, the temporary workpieces are simply cut, and the subsequent cutting is not timely repaired, the FPSO ship body temporary workpiece dismantling method is adopted, the ship body cannot be damaged, and the FPSO ship body temporary workpiece dismantling method is high in practicability. And different methods can be adopted for dismantling according to the position of the workpiece in time, so that the working efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of marine engineering equipment, and in particular to a method for dismantling temporary tooling parts for shipbuilding. Background Art

[0002] Shipbuilding refers to the production industry of building or manufacturing ships, which is usually carried out in a slipway or dock in a specialized shipyard. Shipbuilding itself uses a wide range of technologies, from the hull to the use of the engine. Shipbuilding technology can be divided into several categories, including the hull (or platform, which is mainly based on basic design and structural design. It can be further divided into steel ships, aluminum alloy ships, fiberglass (FRP) ships, cement ships, wooden ships, leather ships, plastic tube rafts, etc.), outfitting (such as electronic equipment, navigation instruments, furniture, other equipment besides the main engine, etc.), machinery (marine main engine, such as steam turbines, gas turbines, diesel engines, nuclear reactors, etc.) and motors.

[0003] Offshore floating production storage and offloading vessels (FPSO) are key facilities for offshore oil development. They are mainly used for the exploitation, processing, storage and transportation of offshore oil, natural gas and other energy sources. When building FPSO ships, temporary tooling parts, namely hoists, are used to assist in shipbuilding. After the hoists are used, some of them need to be dismantled. The method for dismantling the hoists on ordinary hulls is to directly cut them with a cutting device to achieve the purpose of dismantling. However, this direct cutting and dismantling method will cause certain damage to the position where the hoists are located on the hull, and poor cutting methods will affect the normal use of the hull. There is no timely repair after cutting. For this reason, we propose a method for dismantling temporary tooling parts for shipbuilding. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings existing in the prior art, and a method for dismantling temporary tooling parts for shipbuilding is proposed. The method for dismantling temporary tooling parts for shipbuilding solves the problem that the traditional dismantling of temporary tooling parts only adopts a single dismantling method, that is, a simple cutting operation is performed on the temporary tooling parts, and no timely repair is performed after cutting, which may cause damage to the hull during dismantling.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A method for dismantling temporary tooling parts for shipbuilding, including a type A dismantling method, a type C dismantling method and a type D dismantling method, The specific steps of the Class A removal method are as follows: A1. Marking of cutting lines of tooling parts; A2. Perform root cutting of tooling parts according to the cutting line; A3. Plane the cut position after the root is removed; A4. Then repair the surface defects by welding; A5. Finally, perform smooth grinding.

[0006] The specific steps of the Class C removal method are as follows: C1. Marking of cutting lines of some remaining tooling parts; C2. Remove the remaining tooling parts; C3. Repair welding of surface defects; C4. Finally, perform smooth grinding operation.

[0007] The specific steps of the Class D removal method are as follows: D1, the reserved part of the tooling; D2. Perform peripheral welding on the retained part; D3. Only permanent reinforcement materials are retained under the hanging horse; D4. Remove the strengthening (anti-tilt) bracket.

[0008] Preferably, the PT inspection method is used to check the results in both the Class A demolition method and the Class C demolition method.

[0009] Preferably, in the Class A dismantling method, the size of the root cutting of the tooling piece is 10mm-20mm.

[0010] Preferably, during the repair welding operation in the Class A demolition method and the Class C demolition method, spot welding operation shall not be used.

[0011] Preferably, the scope of dismantling of the temporary tooling includes the removal of the hoisting horses of the cargo oil tank and the ballast tank, the removal of the scaffolding horses of the cargo oil tank and the ballast tank, and the removal of the scaffolding horses of the engine room, the stern and the bow.

[0012] Preferably, when the scaffolding in the engine room, stern and bow is removed, the scaffolding in the 2000mm area on the engine room area and the boatswain's storage room deck is removed using Class A method.

[0013] Preferably, after the Class A demolition method, the Class C demolition method and the Class D demolition method are completed, the operation positions need to be sprayed with paint for protection.

[0014] Preferably, when welding defects occur in the Class A demolition method, the Class C demolition method and the Class D demolition method, they can be removed by grinding or carbon planing.

[0015] In summary, the present invention adopts three dismantling methods, namely, Class A dismantling method, Class C dismantling method and Class D dismantling method. Targeted dismantling methods are adopted according to different positions on the ship, and their positions are targetedly marked, and then relative dismantling methods are adopted, thereby improving the dismantling efficiency and dismantling quality, avoiding a single dismantling operation, and causing unnecessary damage to the FPSO hull. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the dismantling method of the present invention; Figure 2 It is a schematic diagram of the removal mark of the lifting horse of the cargo oil tank and the ballast tank of the present invention; Figure 3 It is a schematic diagram of the scaffolding horse removal mark of the cargo oil tank and the ballast tank of the present invention; Figure 4 It is a schematic diagram of the scaffolding horse removal marks of the cabin, stern and bow of the present invention. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0018] Reference Figure 1-Figure 4 A method for dismantling temporary tooling parts for shipbuilding includes a Class A dismantling method, a Class C dismantling method and a Class D dismantling method, wherein the dismantling position needs to be marked as Class A, Class C or Class D according to the dismantling requirements. The specific steps of Class A removal method are as follows: A1. Use a marker pen to mark the cutting line of the tooling parts; A2. Use cutting tools to cut the tooling parts according to the cutting line. The size of the tooling parts cutting is 10mm-20mm. A3. After the root of the tooling part is cut off, the cutting position is planed with a planing tool; A4. If there are surface defects after planing, repair the surface defects by welding. Do not use spot welding during repair welding. If there are no surface defects after planing, proceed to the next step; A5. Finally, use a grinding tool to smooth the planed position or the repair welding position, and use the PT inspection method to check the results. After completion, the operation position needs to be protected by paint spraying.

[0019] The specific steps of Class C removal method are as follows: C1. Use a marker pen to mark the cutting lines of the remaining tooling parts; C2. Use a planing tool to plane away the remaining tooling parts along the marked cutting lines; C3. Repair welding is performed on the surface defects at the planed position according to the planing results. Spot welding is not allowed during repair welding. C4. Finally, smooth and grind the planed areas without surface defects or the areas with surface defects after welding, and use the PT inspection method to check the results. After completion, the operation areas need to be protected by spraying paint.

[0020] The specific steps of Class D removal method are as follows: D1, the reserved part of the tooling; D2. Perform peripheral welding on the retained part; D3. Only permanent reinforcement materials are retained under the hanging horse; D4. After the strengthening (anti-tilt) bracket is removed, its operating position needs to be protected by spraying paint.

[0021] When welding defects occur in the A-type removal method, the C-type removal method and the D-type removal method, they can be removed by grinding or carbon planing. Carbon gouging method uses metal gouging, also known as carbon arc gouging, which is a thermal processing process that uses the arc heat generated between a carbon rod or graphite rod and the workpiece to melt the metal, and uses compressed air to blow away the molten metal, thereby gouging grooves or cutting on the metal surface. This process is mainly used for gouging, eliminating weld defects and back root cleaning in welding production. Carbon arc gouging uses carbon rods or graphite rods as electrodes to generate an arc between the workpiece and melt the metal. The molten metal is blown away by compressed air, thereby forming grooves on the metal surface. For cracks, after they are removed, MT or PT inspection should be carried out to ensure that the cracks are completely removed; The repair length of welds for general strength structural steel should be no less than 30mm, and that for high strength structural steel should be no less than 50mm. Spot welding is strictly prohibited to repair defects such as pores and undercuts.

[0022] It should be noted that the basic principle of PT detection is to use a special penetrant to coat the surface of the material, and detect cracks and other surface defects by observing the accumulation of the penetrant at the defect. This method is suitable for detecting surface opening defects such as cracks, sand holes, etc. During the ship maintenance and modification process, PT detection is very important because it can effectively ensure the safety and reliability of the ship. PT detection refers to the use of penetrant technology to inspect the surface of the FPSO hull to find any cracks, defects, holes, burrs and other problems. The advantage of this detection technology is that it can locate the problem very accurately without causing any damage to the surface of the ship.

[0023] The main function of the lifting horse on the ship is to lift, transport, shift, turn over and load the ship sections and the whole section. The lifting horse is installed on the ship sections or the whole section by welding or other reliable connection methods, and acts as a "handle" to facilitate the crane lifting. Especially in the process of section integration, the lifting horse can provide stable support and lifting functions. The lifting horse is usually installed on the ship section or the whole section by welding to ensure that the section can be stably lifted and moved during the lifting process. When lifting steel plate components or FPSO hull sections, the lifting horse can provide a reliable connection point to ensure the stability and safety of the lifting. Hoisting horses are widely used in shipbuilding for lifting, hoisting, shifting, turning over and loading. For example, in the construction of container ships, due to the weak strength of the lashing bridge structure, it is easy to deform during lifting. Therefore, sufficient hoisting horses need to be set in the design to ensure that the whole section can be safely and smoothly loaded to the designated location. The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for dismantling temporary tooling parts for shipbuilding, characterized in that: Including Class A demolition method, Class C demolition method and Class D demolition method, The specific steps of the Class A removal method are as follows: A1. Marking of cutting lines of tooling parts; A2. Perform root cutting of tooling parts according to the cutting line; A3. Plane the cut position after the root is removed; A4. Then repair the surface defects by welding; A5. Finally, perform smooth grinding. The specific steps of the Class C removal method are as follows: C1. Marking of cutting lines of some remaining tooling parts; C2. Remove the remaining tooling parts; C3. Repair welding of surface defects; C4. Finally, perform smooth grinding operation. The specific steps of the Class D removal method are as follows: D1, the reserved part of the tooling; D2. Perform peripheral welding on the retained part; D3. Only permanent reinforcement materials are retained under the hanging horse; D4. Remove the strengthening (anti-tilt) bracket.

2. A method for dismantling temporary tooling for shipbuilding according to claim 1, characterized in that: The Class A demolition method and the Class C demolition method both use the PT inspection method to check the results.

3. A method for dismantling temporary tooling for shipbuilding according to claim 1, characterized in that: In the Class A dismantling method, the size of the root cutting of the tooling piece is 10mm-20mm.

4. A method for dismantling temporary tooling for shipbuilding according to claim 1, characterized in that: When performing the repair welding operation in the Class A demolition method and the Class C demolition method, spot welding shall not be used.

5. A method for dismantling temporary tooling for shipbuilding according to claim 1, characterized in that: The scope of dismantling of the temporary tooling parts includes the removal of the lifting horses of the cargo oil tanks and ballast tanks, the removal of the scaffolding horses of the cargo oil tanks and ballast tanks, and the removal of the scaffolding horses of the engine room, stern and bow.

6. A method for dismantling temporary tooling for shipbuilding according to claim 5, characterized in that: When removing the scaffolding in the engine room, stern and bow, the scaffolding in the 2000mm area on the engine room area and the boatswain's storage room deck shall adopt Class A removal method.

7. A method for dismantling temporary tooling for shipbuilding according to claim 1, characterized in that: After the Class A demolition method, Class C demolition method and Class D demolition method are completed, the operation locations need to be protected by spraying paint.

8. A method for dismantling temporary tooling for shipbuilding according to claim 1, characterized in that: When welding defects occur in the Class A removal method, the Class C removal method and the Class D removal method, they can be removed by grinding or carbon planing.

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