A method and facility for placing decommissioned large equipment in a disposal unit

Abstract

The application provides a method and a facility for placing a large decommissioned equipment in a disposal unit, the method comprising: installing a lifting platform in the disposal unit, lifting the lifting platform to the top of the disposal unit, hoisting the large decommissioned equipment by using a heavy crane, lowering the large decommissioned equipment to the state that the bottom surface of the large decommissioned equipment abuts against the top surface of the lifting platform while the heavy crane still hoists the large decommissioned equipment, then lowering the lifting platform while the heavy crane synchronously lowers the large decommissioned equipment, and releasing the hoisting of the large decommissioned equipment by the heavy crane after the lifting platform abuts against the ground of the disposal unit, so that the large decommissioned equipment can be accurately and stably placed in the originally designed position in the disposal unit, the large decommissioned equipment is always in a horizontal and stable state during the process of being placed in the disposal unit, the process is safe and reliable and economical, the engineering quantity of installing a large hoisting and lifting equipment is greatly reduced, and the space waste of the disposal unit is avoided.

Description

Technical Field

[0001] The present invention specifically relates to a method and facility for placing large decommissioned equipment in a disposal unit. Background Technology

[0002] Based on the design life of currently operating nuclear power units, a peak in nuclear power plant decommissioning is expected within the next 20 to 30 years. To prepare for this upcoming peak, the disposal of large-scale decommissioned equipment should begin as soon as possible.

[0003] The key to decommissioning large equipment lies in whether or not it needs to be cut into pieces. If cutting is chosen, the subsequent disposal work is relatively simple; the cut pieces can be packaged in standard waste bags, and there are no major difficulties in transportation and disposal. If the option is to retain the large equipment intact, then the subsequent transportation and disposal of the complete pieces must be carefully considered. For the transportation of decommissioned large equipment, experience in transporting large equipment (heavy cargo) during the initial construction of nuclear power plants can be drawn upon. However, there is very little experience to draw upon for the disposal of large equipment; a comprehensive and meticulous consideration of all aspects of the disposal process is necessary, including how to stably and safely place the large equipment in the disposal unit.

[0004] Currently, all low-level radioactive waste disposal sites in my country are near-surface sites, with above-ground, semi-above-ground, and underground facilities, and varying unit sizes. However, regardless of the form or size of the low-level radioactive waste disposal unit, the hoisting equipment is designed for standard waste packaging and can only transport standard waste bags, not large equipment within the disposal unit. To dispose of large equipment within a disposal unit, a heavy-duty gantry crane, two large hydraulic cranes, or a large tower crane with a fixed point are required. Equipping these facilities involves a massive amount of engineering work and high costs, places high demands on the foundation's bearing capacity, and may be impossible due to the structural limitations of the disposal unit. Disposing of large equipment separately requires constructing a separate disposal unit, resulting in an even larger design and construction workload and higher costs. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to address the above-mentioned deficiencies in the prior art by providing an economical, safe and stable method for placing decommissioned large equipment in a disposal unit, and also provides a facility for implementing the method.

[0006] The technical solution adopted to solve the technical problem of this invention is: This invention provides a method for placing decommissioned large equipment in a disposal unit, comprising: S1: Install a lifting platform in the processing unit. S2: Raise the lifting platform to its top, extending beyond the disposal unit. Use a heavy-duty crane to lift the decommissioned large equipment. While the heavy-duty crane is still lifting the decommissioned large equipment, lower the decommissioned large equipment until its bottom surface touches the top surface of the lifting platform. Then lower the lifting platform, and at the same time, lower the decommissioned large equipment simultaneously. After the lifting platform touches the ground of the disposal unit, release the heavy-duty crane from lifting the decommissioned large equipment.

[0007] Optionally, step S1 specifically includes: A partition wall is installed in the disposal unit to separate a disposal room that matches the decommissioned large equipment, and the lifting platform is placed in the disposal room.

[0008] Optionally, the treatment room is provided with a main frame and a lifting drive device on two opposite walls. The lifting platform is slidably connected to the main frame, and the lifting drive device is connected to the lifting platform to drive the lifting platform to rise and fall relative to the main frame.

[0009] Optionally, it also includes: S3: After removing the main frame and lifting drive device, pour a layer of cement mortar on the surface of the decommissioned large equipment in the disposal room.

[0010] Optionally, step S1 further includes laying a low-density sand layer on the floor of the treatment room.

[0011] The present invention also provides a facility for placing decommissioned large equipment in a disposal unit, comprising: a lifting platform and a heavy-duty crane. The lifting platform is placed inside the processing unit and can be raised to its top, extending outside the processing unit. The heavy-duty crane is used to lift decommissioned large equipment, and while still lifting the decommissioned large equipment, it lowers the equipment until its bottom surface abuts against the top surface of the lifting platform. It is also used to simultaneously lower decommissioned large equipment when the lifting platform descends. It is also used to release the lifting of large decommissioned equipment after the lifting platform has come into contact with the ground of the disposal unit.

[0012] Optionally, the disposal unit is provided with a partition wall to separate a disposal room that matches the decommissioned large equipment, and the lifting platform is located in the disposal room.

[0013] Optionally, the treatment room has a main frame and a lifting drive device on two opposite walls. The lifting platform is slidably connected to the main frame, and the lifting drive device is connected to the lifting platform to drive the lifting platform to rise and fall relative to the main frame.

[0014] Optionally, it also includes a pouring device, which is located on the ground and is used to pour a layer of cement mortar on the surface of the large decommissioned equipment after the main frame and lifting drive device have been dismantled.

[0015] Optionally, the floor of the treatment room is paved with a low-density sand layer.

[0016] In this invention, a lifting platform is installed in the disposal unit. After the lifting platform is raised to its top and extends outside the disposal unit, a heavy-duty crane is used to hoist and lower the decommissioned large equipment onto the lifting platform. At this time, the weight of the decommissioned large equipment is mainly borne by the lifting force provided by the heavy-duty crane. Then, the lifting platform is lowered, and the heavy-duty crane simultaneously lowers the decommissioned large equipment to drive it down. During the descent of the decommissioned large equipment, its weight is still mainly borne by the lifting force provided by the heavy-duty crane. The lifting platform supports the decommissioned large equipment to guide it to descend slowly in a stable and horizontal state. Once the lifting platform touches the ground of the disposal unit, the heavy-duty crane releases the lifting force on the decommissioned large equipment, allowing it to be completely lowered onto the lifting platform. This achieves the safe and stable placement of the decommissioned large equipment in the disposal unit. As can be seen, this invention only requires a heavy-duty crane and a lifting platform to accurately and stably place large equipment in the pre-designed position in the disposal unit. This not only ensures that the large equipment remains horizontal and stable during the placement process, but also ensures that the process is safe, reliable, and economical, greatly reducing the workload of installing large hoisting equipment, and does not affect the subsequent normal operation of the original waste bin hoisting device in the disposal unit. Attached Figure Description

[0017] Figure 1 A schematic diagram of the structure of a facility for placing decommissioned large equipment in a disposal unit, as provided by the present invention; Figure 2 This is an operational schematic diagram of the method for placing decommissioned large equipment in a disposal unit provided by the present invention; Figure 3 A schematic diagram showing the main frame anchored to the wall of the treatment room using through-wall bolts; Figure 4 One of the assembly diagrams of the main frame, lifting platform and lifting drive device; Figure 5 This is the second assembly diagram of the main frame, lifting platform, and lifting drive device.

[0018] In the diagram: 1. Main frame; 2. Partition wall; 3. Lifting drive device; 4. Lifting platform; 5. Low-density sand layer; 6. Decommissioned large equipment; 7. Heavy crane. Specific Implementation

[0019] The technical solutions of the invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without creative effort are within the scope of the invention.

[0020] In the description of this invention, it should be noted that the use of terms such as "above" to indicate orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings and is only for the purpose of facilitating and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0021] In the description of this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection," "setting," "installation," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] This invention provides a method for placing decommissioned large equipment in a disposal unit, comprising: S1: Install a lifting platform in the processing unit. S2: Raise the lifting platform to its top, extending beyond the disposal unit. Use a heavy-duty crane to lift the decommissioned large equipment. While the heavy-duty crane is still lifting the decommissioned large equipment, lower the decommissioned large equipment until its bottom surface touches the top surface of the lifting platform. Then lower the lifting platform, and at the same time, lower the decommissioned large equipment simultaneously. After the lifting platform touches the ground of the disposal unit, release the heavy-duty crane from lifting the decommissioned large equipment.

[0024] The present invention also provides a facility for placing decommissioned large equipment in a disposal unit, comprising: a lifting platform and a heavy-duty crane. The lifting platform is placed inside the processing unit and can be raised to its top, extending outside the processing unit. The heavy-duty crane is used to lift decommissioned large equipment, and while still lifting the decommissioned large equipment, it lowers the equipment until its bottom surface abuts against the top surface of the lifting platform. It is also used to simultaneously lower decommissioned large equipment when the lifting platform descends. It is also used to release the lifting of large decommissioned equipment after the lifting platform has come into contact with the ground of the disposal unit.

[0025] Example 1 like Figure 1 and Figure 2 As shown, this embodiment provides a method for placing decommissioned large equipment in a disposal unit based on the disposal unit structure of a near-surface disposal site, including: S1: Install lifting platform 4 in the treatment unit. S2: Raise the lifting platform 4 to its top, extending beyond the disposal unit. Use the heavy-duty crane 7 to lift the decommissioned large equipment 6. While the heavy-duty crane 7 is still lifting the decommissioned large equipment 6, lower the decommissioned large equipment 6 until its bottom surface touches the top surface of the lifting platform 4. Then lower the lifting platform 4, and at the same time, the heavy-duty crane 7 lowers the decommissioned large equipment 6. After the lifting platform 4 touches the ground of the disposal unit, release the heavy-duty crane 7 from lifting the decommissioned large equipment 6.

[0026] Therefore, by installing a lifting platform 4 in the disposal unit, and raising the lifting platform 4 until it extends beyond the disposal unit at its top, a heavy-duty crane 7 is used to hoist and lower the decommissioned large equipment 6 onto the lifting platform 4. At this point, the weight of the decommissioned large equipment 6 is mainly borne by the lifting force provided by the heavy-duty crane 7. Then, the lifting platform 4 is lowered, and the heavy-duty crane 7 simultaneously lowers the decommissioned large equipment 6 to drive it down. During the descent of the decommissioned large equipment 6, its weight is still mainly borne by the lifting force provided by the heavy-duty crane 7. Through the support of the lifting platform 4, the decommissioned large equipment 6 is guided to descend slowly in a stable and horizontal state. Once the lifting platform 4 touches the ground of the disposal unit, the heavy-duty crane 7 can release the lifting of the decommissioned large equipment 6, thus completely lowering it onto the lifting platform 4, thereby achieving the safe and stable placement of the decommissioned large equipment 6 in the disposal unit. As can be seen, this invention only requires a heavy-duty crane and a lifting support platform to accurately and stably place large equipment in the pre-designed position in the disposal unit. This not only ensures that the large equipment remains horizontal and stable during placement into the disposal unit, but also ensures that the process is safe, reliable, and economical, greatly reducing the workload of installing large hoisting equipment, and does not affect the subsequent normal operation of the original waste bin hoisting device in the disposal unit.

[0027] In this embodiment, step S1 specifically includes: A partition wall 2 is installed in the disposal unit to separate a disposal room that matches the decommissioned large equipment 6, and the lifting platform 4 is placed in the disposal room.

[0028] The preferred disposal unit, located at the edge of the disposal facility, is used to house decommissioned large equipment. The location, size, and height of the partition walls (not exceeding the height of the disposal unit) are designed based on the dimensions of the decommissioned large equipment packaging, and then the partition walls are constructed.

[0029] The partition wall 2 separates the space where the decommissioned large equipment 6 is placed from the other spaces in the disposal unit, while the other spaces can continue to dispose of standard waste packages.

[0030] In this embodiment, a main frame 1 and a lifting drive device 3 are provided on both opposite walls of the treatment room. The lifting platform 4 is slidably connected to the main frame 1, and the lifting drive device 3 is connected to the lifting platform 4 to drive the lifting platform 4 to rise and fall relative to the main frame 1.

[0031] like Figure 2 As shown, after the heavy-duty crane 7 lifts the decommissioned large equipment 6 onto the lifting platform 4, the lifting drive device 3 is activated. During the descent of the lifting platform 4, the heavy-duty crane 7 and the lifting platform 4 work together to slowly move the decommissioned large equipment 6 downwards in a stable and horizontal state. The lifting drive device 3 is then turned off when the lifting platform 4 is smoothly lowered onto the low-density sand layer 5 laid on the floor of the disposal room.

[0032] This embodiment also includes: S3: Remove the heavy-duty crane 7, dismantle the main frame 1 and lifting drive device 3 (which can be reused), and then pour a layer of cement mortar on the surface of the decommissioned large equipment 6. After the cement mortar has solidified, standard waste bags can be placed on the decommissioned large equipment to optimize the use of the disposal unit's disposal space.

[0033] Example 2 like Figure 1 and Figure 2 As shown, this embodiment provides a facility for placing decommissioned large equipment in a disposal unit, including: a lifting platform 4 and a heavy-duty crane 7. The lifting platform 4 is placed inside the processing unit and can be raised to its top and extend outside the processing unit. The heavy-duty crane 7 is used to lift the decommissioned large equipment 6, and while still lifting the decommissioned large equipment 6, it lowers the decommissioned large equipment 6 until its bottom surface abuts against the top surface of the lifting platform 4. It is also used to simultaneously lower decommissioned large equipment 6 when the lifting platform 4 descends. It is also used to release the lifting of the decommissioned large equipment 6 after the lifting platform 4 comes into contact with the ground of the disposal unit.

[0034] Therefore, by installing a lifting platform 4 in the disposal unit, and raising the lifting platform 4 until it extends beyond the disposal unit at its top, a heavy-duty crane 7 is used to hoist and lower the decommissioned large equipment 6 onto the lifting platform 4. At this point, the weight of the decommissioned large equipment 6 is mainly borne by the lifting force provided by the heavy-duty crane 7. Then, the lifting platform 4 is lowered, and the heavy-duty crane 7 simultaneously lowers the decommissioned large equipment 6 to drive it down. During the descent of the decommissioned large equipment 6, its weight is still mainly borne by the lifting force provided by the heavy-duty crane 7. Through the support of the lifting platform 4, the decommissioned large equipment 6 is guided to descend slowly in a stable and horizontal state. Once the lifting platform 4 touches the ground of the disposal unit, the heavy-duty crane 7 can release the lifting of the decommissioned large equipment 6, thus completely lowering it onto the lifting platform 4, thereby achieving the safe and stable placement of the decommissioned large equipment 6 in the disposal unit. As can be seen, this invention only requires a heavy-duty crane and a lifting support platform to accurately and stably place large equipment in the pre-designed position in the disposal unit. This not only ensures that the large equipment remains horizontal and stable during placement into the disposal unit, but also ensures that the process is safe, reliable, and economical, greatly reducing the workload of installing large hoisting equipment, and does not affect the subsequent normal operation of the original waste bin hoisting device in the disposal unit.

[0035] Heavy-duty crane 7 is preferably a hydraulic crane with a load capacity greater than 300 tons.

[0036] In this embodiment, a partition wall 2 is provided in the disposal unit to separate a disposal room that matches the decommissioned large equipment 6. The lifting platform 4 is located in the disposal room. The wall is made of reinforced concrete with a thickness of approximately 200-300mm, mainly to provide support for the lifting structure.

[0037] In this embodiment, a main frame 1 and a lifting drive device 3 are provided on two opposite walls of the treatment room. The lifting platform 4 is slidably connected to the main frame 1, and the lifting drive device 3 is connected to the lifting platform 4 to drive the lifting platform 4 to rise and fall relative to the main frame 1.

[0038] like Figures 3-5As shown, the assembled steel structure consisting of the main frame 1, lifting platform 4, and lifting drive device 3 resembles an attached lifting scaffold. The vertical main frame 1, installed on the wall, serves as support and guide rail. The main frame 1 is primarily welded from Ф48 steel pipes and channel steel. The Ф48 steel pipes act as horizontal braces, anchored to the wall via through-wall bolts. The channel steel forms the vertical frame (guide rail). Anti-tilting devices with wall-mounted supports are installed between the main frame 1 and the wall. The remaining vertical frames are anchored to the wall via through-wall bolts. The lifting platform 4, perpendicular to the wall, is used to place decommissioned large equipment 6. The lifting platform 4 is a rectangular frame with horizontal steel pipes or square tubes welded in the middle. The lifting drive device 3 slowly lowers the horizontal frame holding the decommissioned large equipment. In this embodiment, the lifting drive device 3 is an electric hoist with a rated lifting capacity greater than 30 tons.

[0039] This embodiment also includes a pouring device, which is located on the ground and is used to pour a layer of cement mortar onto the surface of the decommissioned large equipment 6 after the main frame 1 and the lifting drive device 3 have been dismantled. After the cement mortar has solidified, standard waste bags can be placed on top of the decommissioned large equipment to optimize the use of the disposal unit's disposal space.

[0040] In this embodiment, a low-density sand layer 5 is laid on the floor of the treatment room to reduce the impact on the ground during the process of large equipment and horizontal frames being lowered to the floor of the treatment room.

[0041] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A method for placing decommissioned large equipment in a disposal unit, characterized in that, include: S1: Install a lifting platform (4) in the disposal unit and set up a partition wall (2) in the disposal unit to separate a disposal room that matches the decommissioned large equipment (6) in the disposal unit, and place the lifting platform (4) in the disposal room; The treatment room is provided with a main frame (1) and a lifting drive device (3) on two opposite walls. The lifting platform (4) is slidably connected to the main frame (1). The lifting drive device (3) is connected to the lifting platform (4) and is used to drive the lifting platform (4) to rise and fall relative to the main frame (1). S2: Raise the lifting platform (4) to extend beyond the disposal unit at its top, and use a heavy crane (7) to lift the decommissioned large equipment (6). While the heavy crane (7) is still lifting the decommissioned large equipment (6), lower the decommissioned large equipment (6) until its bottom surface touches the top surface of the lifting platform (4), and then lower the lifting platform (4). At the same time, the heavy crane (7) lowers the decommissioned large equipment (6) simultaneously. After the lifting platform (4) touches the ground of the disposal unit, release the heavy crane (7) from lifting the decommissioned large equipment (6).

2. The method for placing decommissioned large equipment in a disposal unit according to claim 1, characterized in that, Also includes: S3: After removing the main frame (1) and the lifting drive device (3), pour a layer of cement mortar on the surface of the decommissioned large equipment in the disposal room.

3. The method for placing decommissioned large equipment in a disposal unit according to any one of claims 1-2, characterized in that, Step S1 further includes laying a low-density sand layer (5) on the floor of the treatment room.

4. A facility for placing decommissioned large equipment in a disposal unit, characterized in that, include: Lifting platform (4) and heavy crane (7). The lifting platform (4) is placed in the disposal unit and can be raised to its top and extend outside the disposal unit. The disposal unit is provided with a partition wall (2) to separate a disposal room that matches the decommissioned large equipment (6). The lifting platform (4) is located in the disposal room. The treatment room is provided with a main frame (1) and a lifting drive device (3) on two opposite walls. The lifting platform (4) is slidably connected to the main frame (1). The lifting drive device (3) is connected to the lifting platform (4) and is used to drive the lifting platform (4) to rise and fall relative to the main frame (1). The heavy-duty crane (7) is used to lift decommissioned large equipment (6), and while still lifting the decommissioned large equipment (6), it lowers the decommissioned large equipment (6) until its bottom surface abuts against the top surface of the lifting platform (4). It is also used to simultaneously lower decommissioned large equipment (6) when the lifting platform (4) descends. It is also used to release the lifting of decommissioned large equipment (6) after the lifting platform (4) comes into contact with the ground of the disposal unit.

5. The facility for placing decommissioned large equipment in a disposal unit according to claim 4, characterized in that, It also includes a pouring device, which is located on the ground and is used to pour a layer of cement mortar on the surface of the decommissioned large equipment (6) after the main frame (1) and the lifting drive device (3) are dismantled.

6. The facility for placing decommissioned large equipment in a disposal unit according to any one of claims 4-5, characterized in that, The floor of the treatment room is covered with a low-density sand layer (5).

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