An outdoor trestle for a nuclear fuel reprocessing plant

Abstract

This invention discloses an outdoor trestle for a nuclear fuel reprocessing plant. The reprocessing plant includes a main sanitation entrance and multiple sub-projects. The outdoor trestle connects the main sanitation entrance with these sub-projects. The outdoor trestle is constructed on the ground and has a vertical structure of three or more layers. It includes an elevated layer, a personnel passage layer, and a reagent passage layer, with the elevated layer being the lowest layer. Both the personnel passage layer and the reagent passage layer connect the main sanitation entrance with the sub-projects. The reagent passage layer includes a reagent system transport path for transporting reagents and a pneumatic sample delivery system transport path for transporting radioactive samples. This outdoor trestle facilitates personnel passage, reagent transport, and air duct transport between the main sanitation entrance and the controlled and critical areas within the plant, effectively reducing the land area occupied by the outdoor trestle and facilitating the control of personnel and material flow within the plant area.

Description

Technical Field

[0001] This invention relates to a trestle, and more specifically, to an outdoor trestle for a nuclear fuel reprocessing plant. Background Technology

[0002] In nuclear fuel reprocessing plants, a sub-item refers to a workshop or building within the reprocessing facility, representing a specific process section. Each sub-item is divided into a sub-item monitoring area (including a white zone) and a sub-item control area (including green, orange, and red zones). When each sub-item is operating normally, the monitoring and control areas are independent of each other; personnel cannot directly enter the control area from the outside of the sub-item. Sub-items have personnel inspection and system maintenance mechanisms in place, requiring operators to enter the control area to perform their work. To address the issue of personnel access to the control area, ensure personnel safety and the normal and stable operation of each process system, and meet the reagent, sample analysis, and ventilation requirements of different sub-items, pipelines or passageways need to be installed between sub-items with corresponding functions for transportation. However, currently, there is no mature and effective technical solution.

[0003] Prior art CN104712150A discloses an outdoor corridor and a transportation method thereof. The outdoor corridor includes one or more corridor units, each corridor unit including: a base frame, a top frame, side frames, and end frames. The outdoor corridor includes one corridor unit or multiple corridor units that can be arranged and / or stacked with each other.

[0004] The prior art CN203865586U discloses a multi-layer trestle belt conveyor, including a trestle and multiple hoppers. The trestle is divided into multiple layers, and the height of the multiple hoppers corresponds to each layer of the trestle. Each layer of the trestle is equipped with a belt conveyor, and the discharge end of the belt conveyor is connected to the corresponding hopper.

[0005] The above technical solutions cannot meet the needs of circulation and transportation within nuclear industry reprocessing plants in terms of structural design, strength, and functionality.

[0006] In view of the above technical problems, this invention is hereby introduced. Summary of the Invention

[0007] The main objective of this invention is to provide an outdoor trestle for a nuclear fuel reprocessing plant, which serves to facilitate personnel passage, reagent transport, and air duct transport between the main sanitary entrance and various sub-projects within the protected and critical areas of the plant.

[0008] To achieve the above objectives, the present invention proposes an outdoor trestle for a nuclear fuel reprocessing plant. The reprocessing plant includes a main sanitary entrance and multiple sub-projects. The outdoor trestle connects the main sanitary entrance and multiple sub-projects. The outdoor trestle is built on the ground and has a structure of three or more layers in the vertical direction. The outdoor trestle includes an elevated layer, a personnel passage layer and a reagent passage layer. The elevated layer is the bottom layer of the outdoor trestle.

[0009] Both the personnel access layer and the reagent access layer connect the main health entrance and exit to multiple sub-items. The reagent access layer includes a reagent system delivery path for delivering reagents, and also includes a pneumatic sample delivery system delivery path for delivering radioactive samples.

[0010] Furthermore, the outdoor trestle includes a main trestle and multiple trestle branch roads. One end of the main trestle connects to the main health entrance, and the two ends of the trestle branch roads connect to the main trestle and the sub-project respectively.

[0011] Furthermore, the main trestle and / or trestle branch road includes a trestle sub-item fusion area that traverses the internal area of ​​at least one sub-item.

[0012] Furthermore, the main trestle's trestle sub-item integration area passes through the interior of the auxiliary process sub-item.

[0013] Furthermore, the reprocessing plant includes a control area and a critical area. One end of multiple trestle branches is connected to different locations on the main trestle, and the other end of multiple trestle branches is connected to multiple sub-items in the control area and the critical area.

[0014] Furthermore, the controlled area includes the waste treatment sub-item, and the critical area includes the first main process sub-item, the second main process sub-item, the analysis sub-item, and the radioactive material storage sub-item.

[0015] Furthermore, multiple control doors are installed within the personnel access level, with a control door located near the main health entrance on the main trestle bridge, and control doors also located at the entrances to the critical areas from the outdoor trestle bridge.

[0016] Furthermore, the control door includes personnel entrances and exits and goods entrances and exits. Personnel entrances and exits include revolving doors, radiation dose detection devices, and emergency evacuation doors. Goods entrances and exits include metal detection devices, explosive detection devices, and / or X-ray detection devices.

[0017] Furthermore, multiple evacuation stairwells are provided within the personnel passage level, which connect to the ground outside the outdoor trestle bridge via evacuation stairwells.

[0018] Furthermore, the personnel access level is also equipped with environmental radiation monitoring instruments, cameras, wired broadcasters, clocks, industrial televisions, dispatch telephones, automatic fire alarm devices and / or automatic fire extinguishing devices.

[0019] Furthermore, the personnel access layer is located above the overhead layer, and the reagent access layer is located above the personnel access layer.

[0020] Furthermore, the outdoor trestle also includes an air supply duct layer, which is located above the reagent channel layer and contains air ducts.

[0021] Furthermore, at least a portion of the reagent channel layer is provided with a radiation shielding structure, which is configured to completely surround the reagent system delivery path and the pneumatic sample delivery system delivery path in cross-section.

[0022] Furthermore, at least a portion of the reagent channel layer adopts an insulated tube rack, with hot water pipes for heat tracing inside the insulated tube rack and a detachable stainless steel insulated box structure outside the insulated tube rack.

[0023] Furthermore, expansion joints are provided at the connection points between the outdoor trestle and multiple sub-projects, and electric heat tracing insulation is used at the expansion joints.

[0024] Furthermore, the outdoor trestle is separated from each other by inter-floor slabs, which are made of profiled steel sheets and concrete insulated slabs. The outdoor trestle also includes exterior walls on both sides, which are made of concrete slab partitions and curtain wall systems.

[0025] The outdoor trestle bridge technology solution of the present invention achieves at least the following beneficial effects:

[0026] 1. The outdoor trestle of this application has a multi-layered structure, including an elevated layer, a personnel passage layer, and a reagent passage layer, connecting the main health entrance and multiple sub-projects. This allows the outdoor trestle to integrate multiple functions, such as personnel passage, reagent transportation, and air duct transportation, between the main health entrance and various sub-projects in the controlled and critical areas of the plant, while ensuring the passage of ground roads, personnel, and vehicles within the plant area. This reduces the cluttered layout of various related transportation facilities within the plant area and helps to better control the flow of personnel and materials within the plant area.

[0027] 2. The outdoor trestle of this application is set up with separate transport paths for the reagent system and the pneumatic sample delivery system within the reagent channel layer. This facilitates the separate transport of bulk reagents and radioactive sample vials required for process operation between each sub-item, and also facilitates convenient management of the reagent system and the pneumatic sample delivery system. In the sections with higher radioactivity within the reagent channel layer, a fully enclosed radioactive shielding structure can be flexibly set up to ensure the safety of personnel inside the outdoor trestle.

[0028] 3. The outdoor trestle of this application integrates sections of the outdoor trestle with the interior of the sub-projects by designing a main trestle, trestle branch roads, and trestle sub-project integration areas. This design not only makes full use of the internal space of the sub-projects, improving land utilization and reducing the length of the outdoor trestle to save costs, but also ensures the integrity of the trestle's functions. It scientifically and rationally plans the flow routes of personnel and materials within the post-processing plant area, organizing and forming an efficient production plant area.

[0029] 4. The outdoor trestle of this application, through the design and location of multiple control gates, facilitates the establishment of a strict inspection system within the factory area to monitor the dynamics of personnel and goods at any time, prevent omissions, loss of control, disappearances, or thefts, and achieve safe, orderly, precise, and accurate access control for personnel and goods. It can effectively control the access of personnel and the protection of physical objects in the controlled and critical areas of the factory area, avoiding dangerous or abnormal situations. Furthermore, the personnel passage layer provides a safe, comfortable, and convenient passage environment through the installation of various equipment such as ventilation, fire protection, communication, and monitoring.

[0030] 5. The outdoor trestle of this application, by designing the positions of the reagent passage layer, personnel passage layer and air supply duct layer in the height direction, keeps radioactive materials away from the activity space of personnel, and makes it easy to flexibly add or remove the setting of the air supply duct layer as needed. In addition, the design of the winter heating and insulation system makes reasonable use of the heat transfer between the upper and lower layers, maximizing the use of the structure's function. Attached Figure Description

[0031] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0032] Figure 1 A cross-sectional view of an outdoor trestle bridge in one embodiment is shown;

[0033] Figure 2 A schematic plan view of the outdoor trestle of the post-processing plant in one embodiment is shown.

[0034] The above figures include the following reference numerals:

[0035] 1. Main health entrance / exit; 2. Elevated floor;

[0036] 3. Personnel passageway level; 301. Control door; 302. Evacuation staircase; 303. Environmental radiation monitoring instrument; 304. Camera; 305. Wired public address system; 306. Clock;

[0037] 4. Reagent channel layer; 401. Reagent system delivery path; 402. Pneumatic sample delivery system delivery path; 403. Radiation shielding structure;

[0038] 5. Air supply duct layer; 501. Air duct;

[0039] 6. Main pier; 601. Pier sub-project integration area;

[0040] 7. Trestle Bridge Branch Road; 8. Auxiliary Process Sub-item; 9. Waste Disposal Sub-item; 10. Vehicles; 11. First Main Process Sub-item; 12. Second Main Process Sub-item; 13. Analytical Sub-item; 14. Radioactive Material Storage Sub-item; 15. Inter-floor Slab; 16. Exterior Wall;

[0041] 100. Control Zone; 200. Critical Zone. Detailed Implementation

[0042] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0043] The present invention will be further described in detail below with reference to specific embodiments. These embodiments should not be construed as limiting the scope of protection claimed by the present invention. The term "comprising" indicates the presence of a feature, but does not exclude the presence or addition of one or more other features. The terms "lateral," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the purpose of description, and do 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 the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] In this description, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 these terms in this invention based on the specific circumstances. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0045] Example:

[0046] This invention proposes an outdoor trestle for a nuclear fuel reprocessing plant, such as... Figure 2As shown, the reprocessing plant area includes a main sanitation entrance 1 and multiple sub-projects. The reprocessing plant comprises a control area 100 and a critical area 200, each containing multiple sub-projects. An outdoor trestle bridge spans the control area 100 and the critical area 200, connecting the main sanitation entrance 1 with the multiple sub-projects. In the reprocessing plant, a sub-project refers to a workshop or building representing a specific process section within the reprocessing facility. These sub-projects are distributed throughout the plant area.

[0047] like Figure 1 As shown, the outdoor trestle is constructed on the ground and has a vertical structure of three or more layers. The outdoor trestle includes an elevated layer 2, a personnel passage layer 3, and a reagent passage layer 4, with the elevated layer 2 being the lowest layer. That is, the elevated layer 2 is the ground floor. The elevated layer 2 can be designed with piers arranged at certain intervals, allowing vehicles 10 to pass underneath. This ensures that the outdoor trestle does not obstruct ground roads, personnel, or vehicle traffic within the factory area. Preferably, depending on the interface function of each sub-item, functional layers of the outdoor trestle can be added or removed from the corresponding passages.

[0048] Combination Figure 1-2 As shown, both personnel access layer 3 and reagent access layer 4 connect the main hygiene entrance / exit 1 with multiple sub-items. Personnel can move between the main hygiene entrance / exit 1 and the green zones of multiple sub-items via personnel access layer 3. Personnel passing through personnel access layer 3 can first reach the intermediate layer within a sub-item to quickly reach their destination and carry out work in the sub-item control area (green zone).

[0049] The reagent channel layer 4 includes a reagent system delivery path 401 for delivering bulk reagents required for process operation, such as TBP, kerosene, sodium hydroxide, and nitric acid. The reagent channel layer 4 also includes a pneumatic sample delivery system path 402 for delivering radioactive sample vials required for analysis in each process sub-item. The reagent system delivery path and the pneumatic sample delivery system path are respectively connected to the reagent system and pneumatic sample delivery system of each main process sub-item in the reprocessing plant.

[0050] The outdoor trestle of this application is designed with separate transport paths for the reagent system and the pneumatic sample delivery system within the reagent channel layer. This facilitates the separate transport of large quantities of reagents and radioactive sample vials required for process operation between different sub-projects, and also facilitates convenient management of the reagent system and the pneumatic sample delivery system.

[0051] The outdoor trestle also includes an air supply duct layer 5, which houses air ducts 501. The air supply duct layer 5 provides support and a pathway for the air ducts 501 to meet the air supply requirements of certain sub-projects. The internal design of the air supply duct layer 5 must ensure the supply of air volume, temperature, humidity, noise, and other air supply parameters.

[0052] The outdoor trestle of this application, through its multi-layered structure including an elevated layer, a personnel passage layer, and a reagent passage layer, connects the main sanitation entrance and multiple sub-projects. This allows the outdoor trestle to integrate multiple functions, such as personnel passage, reagent transportation, and air duct transportation, between the main sanitation entrance and various sub-projects in the controlled and critical areas of the plant, while ensuring the passage of ground roads, personnel, and vehicles within the plant area. This reduces the cluttered layout of various related transportation facilities within the plant area and facilitates better control of the flow of personnel and materials within the plant area.

[0053] like Figure 2 As shown, the outdoor trestle includes a main trestle 6 and multiple trestle branch roads 7. One end of the main trestle 6 is connected to the main health entrance 1, and the two ends of the trestle branch roads 7 are connected to the main trestle 6 and the sub-project respectively.

[0054] Preferably, the main trestle 6 or the trestle branch 7 includes a trestle sub-item integration area 601, which extends through the internal area of ​​at least one sub-item. The trestle sub-item integration area 601 is a fusion design between the outdoor trestle and the sub-item, reducing the number of outdoor trestle sections while maintaining the integrity of the trestle function. In this embodiment, the main trestle 6 has one trestle sub-item integration area 601 that extends through the interior of the auxiliary process sub-item 8. In other embodiments, the main trestle 6 may extend through the internal areas of multiple sub-items to form multiple trestle sub-item integration areas 601. Trestle sub-item integration areas 601 may also be provided on the trestle branch 7.

[0055] Specifically, such as Figure 2 As shown, in this embodiment, one end of each of the multiple trestle branch roads 7 is connected to different positions of the main trestle road 6, and the other end of each of the multiple trestle branch roads 7 is connected to multiple sub-items of the control area 100 and the critical area 200. The control area 100 includes a waste treatment sub-item 9 and an auxiliary process sub-item 8, and the critical area 200 includes a first main process sub-item 11, a second main process sub-item 12, an analysis sub-item 13, and a radioactive material storage sub-item 14.

[0056] The outdoor trestle in this application integrates sections of the outdoor trestle with the interior of the sub-projects through the design of the main trestle, trestle branch roads, and trestle sub-project integration areas. This design not only makes full use of the internal space of the sub-projects, improving land utilization and reducing the length of the outdoor trestle to save costs, but also ensures the integrity of the trestle's functions. It scientifically and rationally plans the flow routes of personnel and materials within the post-processing plant area, organizing and constituting an efficient production plant area.

[0057] Within the reprocessing plant, critical area 200 is relatively complex in function and has high radioactivity, requiring key protection for personnel and structures. Critical area 200 and control area 100 require separate controls for personnel access and the transfer of goods. Combined with... Figure 2As shown, multiple control doors 301 are installed in the personnel passage level 3. For example, a control door 301 is installed near the main health entrance 1 on the main trestle bridge 6, and control doors 301 are also installed at the entrances to the critical area 200 on the outdoor trestle bridge.

[0058] Preferably, a first control gate is installed at the junction of the personnel passage level 3 and the main personnel health entrance 1. Control gates 301 are also installed before each sub-item of the critical area 200 on the main trestle bridge 6 and each branch road of the trestle bridge 7, so as to provide special protection for the critical area 200 in multiple levels.

[0059] Specifically, control door 301 provides separate control for personnel and goods, including personnel entrances and exits. The personnel entrance is equipped with a revolving door and a radiation dose detection device, requiring personnel to undergo security verification such as password, fingerprint, or identification before passage. An emergency evacuation door, normally closed, is also located nearby. The goods entrance is equipped with metal detectors, explosive detectors, and / or X-ray detection devices to monitor the items carried by personnel.

[0060] The outdoor trestle of this application, through the design and location of multiple control gates, facilitates the establishment of a strict inspection system within the factory area. This allows for real-time monitoring of the movement of personnel and goods, preventing omissions, loss of control, disappearances, or thefts. It enables safe, orderly, precise, and accurate access control for personnel and goods, effectively controlling personnel access and protecting physical assets within the controlled and critical areas of the factory, thus avoiding dangerous or abnormal situations.

[0061] In addition, multiple evacuation staircases are provided within the personnel passage level 3, which connect to the ground outside the outdoor trestle via evacuation staircase 302. This ensures that personnel can quickly evacuate the site in the event of an emergency within the factory area, thereby guaranteeing personnel safety.

[0062] Preferably, combined with Figure 1-2 As shown, the personnel passage level 3 is also equipped with cameras 304, wired broadcasters 305, clocks 306, industrial televisions, dispatch telephones and other equipment, which can ensure that personnel entering the protected area are aware of the area's dynamics and can communicate with the outside world at any time.

[0063] The personnel access level 3 also needs to be equipped with heating, ventilation, fire protection, and monitoring and alarm systems, such as environmental radiation monitoring instrument 303, automatic fire alarm devices, and / or automatic fire extinguishing devices. Ionizing radiation warning procedures can be added at the entrances to the radioactive material storage sub-item and the radioactive material handling sub-item. By installing various equipment such as ventilation, fire protection, communication, and monitoring systems, the personnel access level provides a safe, comfortable, and convenient passage environment for personnel within the plant area.

[0064] In this embodiment, as Figure 1As shown, personnel access level 3 is located above elevated level 2, and reagent access level 4 is located above personnel access level 3. Air supply duct level 5 is located above reagent access level 4. Preferably, personnel access level 3 is the second floor above ground, reagent access level 4 is the third floor above ground, and air supply duct level 5 is the fourth floor above ground. Air supply duct level 5 can be added or removed as needed for each sub-item.

[0065] like Figure 1 As shown, at least a portion of the reagent channel layer 4 is provided with a radiation shielding structure 403, which is configured to completely surround the reagent system delivery path 401 and the pneumatic sample delivery system delivery path 402 in cross-section. Preferably, a fully enclosed shielding structure is required in sections with higher radioactivity, away from personnel activity areas, to ensure personnel safety; no shielding structure is required in sections with lower radioactivity, and the setting of the shielding structure can be flexibly changed according to needs.

[0066] The overall support structure of the outdoor trestle is a steel frame structure, which has high strength to achieve load-bearing capacity. If the outdoor trestle is located in a cold region, the design of a winter heating and insulation system needs to be considered.

[0067] Specifically, at least a portion of reagent channel layer 4 adopts an insulated pipe rack structure, with hot water pipes for heat tracing inside the rack and a detachable stainless steel insulated box structure outside. Expansion joints are provided at the connection points between the outdoor trestle and multiple sub-projects, and electric heat tracing insulation is used at these expansion joints.

[0068] like Figure 1 As shown, the outdoor trestle is separated from each floor by inter-floor slabs 15. The inter-floor slabs 15 are insulated floor slabs made of profiled steel sheets and concrete. The outdoor trestle also includes exterior walls 16 on both sides. The exterior walls 16 are made of concrete slab partitions and curtain wall systems.

[0069] The outdoor trestle of this application, by designing the positions of the reagent passage layer, personnel passage layer and air supply duct layer in the height direction, keeps radioactive materials away from the activity space of personnel, and makes it easy to flexibly add or remove the air supply duct layer as needed. In combination with the design of the winter heating and insulation system, it makes reasonable use of heat transfer between the upper and lower layers and maximizes the use of the structure's function.

[0070] In summary, it can be seen from the above description that the embodiments of the present invention achieve the following technical effects:

[0071] 1. The outdoor trestle of this application has a multi-layered structure, including an elevated layer, a personnel passage layer, and a reagent passage layer, connecting the main health entrance and multiple sub-projects. This allows the outdoor trestle to integrate multiple functions, such as personnel passage, reagent transportation, and air duct transportation, between the main health entrance and various sub-projects in the controlled and critical areas of the plant, while ensuring the passage of ground roads, personnel, and vehicles within the plant area. This reduces the cluttered layout of various related transportation facilities within the plant area and helps to better control the flow of personnel and materials within the plant area.

[0072] 2. The outdoor trestle of this application is set up with separate transport paths for the reagent system and the pneumatic sample delivery system within the reagent channel layer. This facilitates the separate transport of bulk reagents and radioactive sample vials required for process operation between each sub-item, and also facilitates convenient management of the reagent system and the pneumatic sample delivery system. In the sections with higher radioactivity within the reagent channel layer, a fully enclosed radioactive shielding structure can be flexibly set up to ensure the safety of personnel inside the outdoor trestle.

[0073] 3. The outdoor trestle of this application integrates sections of the outdoor trestle with the interior of the sub-projects by designing a main trestle, trestle branch roads, and trestle sub-project integration areas. This design not only makes full use of the internal space of the sub-projects, improving land utilization and reducing the length of the outdoor trestle to save costs, but also ensures the integrity of the trestle's functions. It scientifically and rationally plans the flow routes of personnel and materials within the post-processing plant area, organizing and forming an efficient production plant area.

[0074] 4. The outdoor trestle of this application, through the design and location of multiple control gates, facilitates the establishment of a strict inspection system within the factory area to monitor the dynamics of personnel and goods at any time, prevent omissions, loss of control, disappearances, or thefts, and achieve safe, orderly, precise, and accurate access control for personnel and goods. It can effectively control the access of personnel and the protection of physical objects in the controlled and critical areas of the factory area, avoiding dangerous or abnormal situations. Furthermore, the personnel passage layer provides a safe, comfortable, and convenient passage environment through the installation of various equipment such as ventilation, fire protection, communication, and monitoring.

[0075] 5. The outdoor trestle of this application, by designing the positions of the reagent passage layer, personnel passage layer and air supply duct layer in the height direction, keeps radioactive materials away from the activity space of personnel, and makes it easy to flexibly add or remove the setting of the air supply duct layer as needed. In addition, the design of the winter heating and insulation system makes reasonable use of the heat transfer between the upper and lower layers, maximizing the use of the structure's function.

[0076] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An outdoor trestle for a nuclear fuel reprocessing plant, the reprocessing plant comprising a main sanitary entrance (1) and multiple sub-projects, characterized in that: The outdoor trestle connects the main health entrance (1) with the multiple sub-items. The outdoor trestle is built on the ground and has a structure of three or more layers in the vertical direction. The outdoor trestle includes an elevated layer (2), a personnel passage layer (3), and a reagent passage layer (4). The elevated layer (2) is the bottom layer of the outdoor trestle. The personnel access layer (3) and the reagent access layer (4) are both connected to the main health entrance (1) and the multiple sub-items. The reagent access layer (4) includes a reagent system delivery path (401) for delivering reagents. The reagent access layer (4) also includes a pneumatic sample delivery system delivery path (402) for delivering radioactive samples.

2. The outdoor trestle bridge according to claim 1, characterized in that: The outdoor trestle includes a main trestle (6) and multiple trestle branch roads (7). One end of the main trestle (6) is connected to the main health entrance (1), and the two ends of the trestle branch roads (7) are connected to the main trestle (6) and the sub-item, respectively.

3. The outdoor trestle bridge according to claim 2, characterized in that: The main trestle (6) and / or the trestle branch (7) include a trestle sub-item fusion area (601) that passes through the internal area of ​​at least one of the sub-items.

4. The outdoor trestle bridge according to claim 3, characterized in that: The fusion area (601) of the main trestle (6) passes through the interior of the auxiliary process sub-item (8).

5. The outdoor trestle bridge according to claim 3, characterized in that: The post-processing plant includes a control area (100) and a critical area (200). One end of each of the multiple trestle branches (7) is connected to a different location of the main trestle (6), and the other end of each of the multiple trestle branches (7) is connected to multiple sub-items of the control area (100) and the critical area (200).

6. The outdoor trestle bridge according to claim 5, characterized in that: The control area (100) includes a waste treatment sub-item (9), and the critical area (200) includes a first main process sub-item (11), a second main process sub-item (12), an analysis sub-item (13), and a radioactive material storage sub-item (14).

7. The outdoor trestle bridge according to claim 5, characterized in that: Multiple control doors (301) are provided in the personnel passage layer (3). The main trestle (6) is provided with a control door (301) near the main health entrance (1). The outdoor trestle is provided with control doors (301) at the entrance to the critical area (200).

8. The outdoor trestle bridge according to claim 7, characterized in that: The control door (301) includes a personnel entrance and an item entrance. The personnel entrance includes a revolving door, a radiation dose detection device, and an emergency evacuation door. The item entrance includes a metal detection device, an explosive detection device, and / or an X-ray detection device.

9. The outdoor trestle bridge according to claim 7, characterized in that: The personnel passage level (3) is provided with multiple evacuation stairwells, which are connected to the ground outside the outdoor trestle via evacuation staircases (302).

10. The outdoor trestle bridge according to claim 9, characterized in that: The personnel passage level (3) is also equipped with an environmental radiation monitoring instrument (303), a camera (304), a wired broadcaster (305), a clock (306), an industrial television, a dispatch telephone, an automatic fire alarm device and / or an automatic fire extinguishing device.

11. The outdoor trestle bridge according to any one of claims 1-10, characterized in that: The personnel passage layer (3) is located above the overhead layer (2), and the reagent passage layer (4) is located above the personnel passage layer (3).

12. The outdoor trestle bridge according to claim 11, characterized in that: The outdoor trestle also includes an air supply duct layer (5), which is located above the reagent channel layer (4), and an air duct (501) is installed inside the air supply duct layer (5).

13. The outdoor trestle bridge according to claim 1, characterized in that: At least a portion of the reagent channel layer (4) is provided with a radiation shielding structure (403), which is configured to completely surround the reagent system delivery path (401) and the pneumatic sample delivery system delivery path (402) in cross-section.

14. The outdoor trestle bridge according to claim 13, characterized in that: At least a portion of the reagent channel layer (4) is in the form of an insulated pipe rack, with hot water pipes for heat tracing inside the insulated pipe rack and a detachable stainless steel insulated box structure outside the insulated pipe rack.

15. The outdoor trestle bridge according to claim 1, characterized in that: Expansion joints are provided at the connection points between the outdoor trestle bridge and the multiple sub-projects, and electric heat tracing is used for insulation at the expansion joints.

16. The outdoor trestle bridge according to claim 1, characterized in that: The outdoor trestle is separated from each other by inter-floor slabs (15), which are made of profiled steel sheets and concrete insulated floor slabs. The outdoor trestle also includes exterior walls (16) on both sides, which are made of concrete slab partitions and curtain wall systems.

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