Peripheral protection body of polyethylene solid radiation shielding device for deep ground laboratory

Abstract

The utility model provides an external enclosure body of a polyethylene solid radiation shielding device for a deep ground laboratory, which is characterized in that a ground enclosure body comprises a large-thickness ground polyethylene plate layer laid at the bottom of a polyethylene shielding bin, and a wall enclosure body comprises a large-thickness wall polyethylene plate layer surrounding the periphery of the polyethylene shielding bin; the outer surface of the wall face polyethylene plate layer is wrapped by a fireproof plate layer, the front face and the side face of the wall face enclosure body are each provided with an entrance and exit, each entrance and exit is of a non-through structure, and the top face enclosure body comprises a large-thickness top face polyethylene plate layer laid on the top of the polyethylene shielding bin. The bottom of the wall surface polyethylene plate layer is connected with the periphery of the ground polyethylene plate layer, and the top of the wall surface polyethylene plate layer is connected with the periphery of the top surface polyethylene plate layer, so that a solid radiation shielding cabin is defined, water prevention, fire prevention, internal cleanness and the like of the radiation shielding device in an extremely deep space environment are realized, and environmental conditions are provided for experiments in the shielding device.

Description

Technical Field

[0001] The utility model relates to the technical field of deep underground laboratory construction engineering, in particular to an outer protective body of a polyethylene solid radiation shielding device for a deep underground laboratory. Background Art

[0002] In order to meet the needs of conducting cutting-edge physics research in particle physics, astrophysics, cosmology, etc., it is extremely important to take advantage of the excellent low cosmic ray flux environment deep in the mountains and build an extremely low radiation background cutting-edge physics laboratory thousands of meters underground.

[0003] In an extremely deep underground environment of several thousand meters, how to meet the space radiation shielding requirements in deep earth experiments while achieving the goals of blocking underground rock seepage, underground fire prevention and internal cleanliness is an important technical problem that needs to be solved by the laboratory's outer protective structure. Utility Model Content

[0004] Based on this, the utility model provides an outer protective body of a polyethylene solid radiation shielding device for a deep underground laboratory, so as to realize waterproofing, fireproofing and internal cleanliness of the radiation shielding device in an extremely deep space environment, and provide environmental conditions for experiments inside the shielding device.

[0005] In order to achieve the above-mentioned purpose, the utility model provides an outer protective body of a polyethylene solid radiation shielding device for a deep underground laboratory, including a ground protective body, a wall protective body and a top protective body;

[0006] The ground enclosure includes a thick polyethylene board layer laid on the bottom of the polyethylene shielding bin;

[0007] The wall enclosure includes a thick polyethylene wall layer arranged around the outer periphery of the polyethylene shielding chamber, the outer surface of the polyethylene wall layer is covered with a fireproof board layer, and the front and side of the wall enclosure are respectively provided with entrances and exits, and each of the entrances and exits is respectively provided with a non-through structure;

[0008] The top surface enclosure includes a thick top surface polyethylene board layer laid on the top of the polyethylene shielding bin;

[0009] The bottom of the wall polyethylene board layer is connected to the outer periphery of the ground polyethylene board layer, and the top is connected to the outer periphery of the top surface polyethylene board layer, thereby forming a solid radiation shielding device for the deep underground laboratory.

[0010] Furthermore, a foundation pit is dug in the underground rock stratum where the polyethylene shielding cabin is to be built. The bottom of the foundation pit is provided with a drainage channel, and the side walls are paved with drainage boards connected to the drainage channel. The ground polyethylene board layer is laid at the bottom of the pit, and the upper surface is flush with the floor of the deep underground laboratory. The water seeping from the bottom of the pit is discharged through the drainage channel in the pit, and the water seeping from the side walls is discharged to the drainage channel in the pit through the drainage boards, so that the accumulated water at the ground enclosure is removed in time and the polyethylene shielding cabin has good waterproof performance.

[0011] Furthermore, the drainage channel in the pit includes a circular drainage ditch surrounding the foundation pit and a longitudinal drainage ditch perpendicular to the long side of the foundation pit. The bottom of the drainage board is connected to the circular drainage ditch, and the drainage channel is connected to the underground drainage system through the drainage ditch. A cover plate is laid on the drainage channel in the pit, and the ground polyethylene board layer is laid on top of the cover plate. The circular drainage ditch is combined with the longitudinal drainage ditch to improve the comprehensiveness and timeliness of drainage.

[0012] Furthermore, anti-overturning steel columns are respectively provided on the inner and outer sides of the wall polyethylene board layer, diagonal braces are provided between adjacent anti-overturning steel columns, and the first steel beam and steel grille are erected on the top of the inner steel column. The portion of the top polyethylene board layer located within the wall enclosure is supported by the first steel beam and steel grille on the top surface. The firmness of the wall polyethylene board layer is improved by the anti-overturning high columns, and the top polyethylene board layer is supported by the first steel beam and steel grille, thereby improving the firmness of the top polyethylene board.

[0013] Furthermore, the fireproof board layer is hung on the outside of the outer steel column, and steel beams and concrete floor slabs are laid above the top polyethylene board layer. The concrete floor slab covers the top polyethylene board layer and is connected to the fireproof board layer hung on the outside of the wall polyethylene board to form an integrated fireproof isolation structure, thereby isolating the entire polyethylene shielding chamber from the outside and improving the overall fire resistance.

[0014] Furthermore, a two-story laboratory is built above the top enclosure, and a second steel beam and a concrete floor are set on the outer steel columns of the top polyethylene board layer as the floor structure of the second-story laboratory, which expands the experimental space and is conducive to the stability of the top polyethylene board layer.

[0015] The utility model provides the following beneficial effects on the outer protective body of a polyethylene solid radiation shielding device for a deep underground laboratory:

[0016] 1. A solid radiation shielding cabin is formed by thick polyethylene sheets on the ground, walls, and roof. The entrance and exit are non-through structures. The interior of the polyethylene shielding cabin meets the radiation shielding conditions required for cutting-edge physics experiments with extremely low radiation background and is suitable for extremely deep underground environments.

[0017] 2. A foundation pit is dug in the underground rock stratum. A thick layer of polyethylene board is laid in the foundation pit with the upper surface flush with the ground. A drainage channel is arranged in the foundation pit and connected to the underground drainage system. This not only enables the timely discharge of seepage water from the pit bottom and pit wall, but also ensures internal cleanliness, providing convenience for the experiment;

[0018] 3. Hang fireproof panels on the outside of the outer steel columns, and lay concrete floor slabs on the second steel beam on the top to form a fireproof structure wrapped around the wall polyethylene board layer and the top polyethylene board layer to improve the fire resistance of the polyethylene shielding cabin. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which constitute a part of the specification, illustrate embodiments of the present invention and, together with the specification, are used to explain the principles of the present invention. The present invention may be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

[0020] Figure 1 This is a plan view of a polyethylene shielding cabin provided according to an embodiment of the present utility model;

[0021] Figure 2 This is a cross-sectional view of a polyethylene shielding cabin provided according to an embodiment of the present utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the polyethylene shielding cabin ground enclosure provided according to an embodiment of the present utility model;

[0023] Figure 4 This is a schematic diagram of the structure of the polyethylene shielding cabin wall enclosure provided according to an embodiment of the present utility model;

[0024] Figure 5 This is a schematic diagram of the top enclosure structure of a polyethylene shielding cabin provided according to an embodiment of the present invention.

[0025] 1- ground enclosure, 11- ground polyethylene board layer, 12- C30 plain concrete layer, 13- waterproof mortar layer, 14- waterproof coating layer, 15- geotextile isolation layer, 16- wear-resistant polyurethane mortar surface layer;

[0026] 2- wall enclosure, 21- wall polyethylene board layer, 22- outer steel column, 23- fireproof board layer, 24- inner steel column, 25- decorative board layer;

[0027] 3-top enclosure, 31-top polyethylene board layer, 32-ceiling board, 33-cable tray, 34-top first steel beam, 35-top second steel beam, 36-concrete floor slab;

[0028] 4- Entrance and exit;

[0029] 5-Polyethylene shielding cabin;

[0030] 6- Second floor laboratory;

[0031] 7-front warehouse;

[0032] 8-Drainage channels in the pit. DETAILED DESCRIPTION

[0033] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present invention, its application, or use. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. In the present invention, when a particular device is described as being located between a first device and a second device, there may or may not be an intervening device between the particular device and either the first device or the second device.

[0034] like Figures 1 to 5 As shown, the utility model provides an outer protective body of a polyethylene solid radiation shielding device for a deep underground laboratory, comprising a ground enclosure 1, a wall enclosure 2 and a top enclosure 3; the ground enclosure 1 comprises a thick ground polyethylene board layer 11 laid on the bottom of a polyethylene shielding cabin 5; the wall enclosure 2 comprises a thick wall polyethylene board layer 21 arranged around the outer periphery of the polyethylene shielding cabin 5, the outer surface of the wall polyethylene board layer 21 is covered with a fireproof board layer 23, and entrances and exits 4 are respectively provided on the front and sides of the wall enclosure 2, and each of the entrances and exits 4 is respectively set as a non-through structure; the top enclosure 3 comprises a thick top polyethylene board layer 31 laid on the top of the polyethylene shielding cabin 5; the bottom of the wall polyethylene board layer 21 is connected to the outer periphery of the ground polyethylene board layer 11, and the top is connected to the outer periphery of the top polyethylene board layer 31, enclosing a solid radiation shielding device for a deep underground laboratory.

[0035] Among them, the ground polyethylene board layer 11, the wall polyethylene board layer 21 and the top polyethylene board layer 31 are respectively composed of multiple layers of polyethylene boards stacked with staggered seams, and the thickness of the adjacent edge connections of the ground polyethylene board layer 11, the wall polyethylene board layer 21 and the top polyethylene board layer 31 is not less than the main body thickness of each board layer.

[0036] Based on the above embodiment, the outer protective body of the polyethylene solid radiation shielding device of the deep underground laboratory provided includes a ground enclosure 1, a wall enclosure 2 and a top enclosure 3; the solid radiation shielding cabin 5 is formed by enclosing a thick ground polyethylene board layer 22, a wall polyethylene board layer 32 and a top polyethylene board layer 31, and the entrance and exit of the wall enclosure 2 are non-through structures. The interior of the polyethylene shielding cabin 5 meets the radiation shielding conditions requirements of the extremely low radiation background cutting-edge physics experiments, adapts to the extremely deep underground environment, and meets the needs of cutting-edge physics research such as particle physics, astrophysics and cosmology.

[0037] In a specific implementation, a high-purity oxygen-free copper shielding layer and a low-background lead shielding layer are provided inside the ground enclosure 1, the wall enclosure 2 and the top enclosure 3 to form a composite shielding structure, thereby improving the composite shielding function of radiation.

[0038] like Figure 3 、 Figure 4 As shown, during the construction process, a foundation pit is excavated in the underground rock stratum where the polyethylene shielding cabin is to be constructed. The bottom of the foundation pit is provided with an in-pit drainage channel 8, and the side walls are paved with drainage boards connected to the drainage channel. The ground polyethylene board layer 11 is laid on the bottom of the pit, and its upper surface is flush with the floor of the deep underground laboratory. In the specific implementation process, the in-pit drainage channel 8 includes an annular drainage ditch surrounding the foundation pit and a longitudinal drainage ditch perpendicular to the long side of the foundation pit. The bottom of the drainage board is connected to the annular drainage ditch, and the drainage channel is connected to the underground drainage system through a drainage ditch. The in-pit drainage channel 8 is laid with a cover plate, and the ground polyethylene board layer 11 is laid on top of the cover plate.

[0039] Based on the above embodiment, a foundation pit is dug in the underground rock stratum, and a thick ground polyethylene board layer 11 is laid in the foundation pit with the upper surface flush with the ground. An internal drainage channel 8 is arranged in the foundation pit and connected to the underground drainage system, which not only enables the timely discharge of seepage water from the pit bottom and pit wall, but also achieves internal cleanliness, provides convenience for the experiment, and meets the test conditions of waterproofing and environmental cleanliness of the polyethylene shielding cabin 5.

[0040] like Figure 4 As shown, anti-overturning steel columns are installed on both the inner and outer sides of the wall polyethylene sheet layer 21, with diagonal braces installed between adjacent anti-overturning steel columns. A top first steel beam 34 and a steel grille are installed on top of the inner steel column 24. The portion of the top polyethylene sheet layer 31 located within the wall enclosure 2 is supported by the top first steel beam 34 and steel grille. The anti-overturning high columns enhance the firmness of the wall polyethylene sheet layer 21, and the top first steel beam 34 and steel grille provide support for the top polyethylene sheet layer 31, thereby improving the firmness of the top polyethylene sheet. The fireproof board layer 23 is suspended on the outside of the outer steel column 22.

[0041] The utility model provides a process for constructing the outer protective body of a polyethylene solid radiation shielding device for a deep underground laboratory:

[0042] First, a foundation pit is dug in the underground rock layer where the polyethylene shielding cabin 5 is to be built; a drainage channel 8 connected to the underground drainage system is dug at the bottom of the foundation pit, a cover plate is laid on the surface of the drainage channel 8, and a thick polyethylene board layer 11 is laid after the bottom of the pit is leveled;

[0043] Then, a wall polyethylene sheet layer 21 connected to the ground polyethylene sheet layer 11 is constructed, and anti-overturning steel columns are installed on the inner and outer sides of the wall polyethylene sheet layer 21;

[0044] Then, the first steel beam 34 and steel grid are erected on the inner steel column 24, and the top polyethylene sheet 31 connected to the wall polyethylene sheet 21 is laid on top of the first steel beam 34 and steel grid;

[0045] Next, a second steel beam 35 and a concrete floor slab 36 are installed on the outer steel columns 22 of the top polyethylene sheet layer 31. A fireproofing layer 23 is attached to the outer steel columns 22 and connected to the concrete floor slab. Steel beams and a concrete floor slab 36 are laid above the top polyethylene sheet layer 31. The concrete floor slab 36 covers the top polyethylene sheet layer. The fireproofing layer 23 is attached to the outer steel columns 22. The concrete floor slab 36 is connected to the fireproofing layer 23 attached to the outer polyethylene sheet wall, forming an integrated fireproofing isolation structure, improving overall fire protection performance.

[0046] Finally, a second-story laboratory 6 is constructed above the concrete floor 36, using the second steel beam 35 and concrete floor slab 36 as the floor structure. A second-story laboratory 6 is constructed above the top enclosure 3. The second steel beam 35 and concrete floor slab 36 are installed on the outer steel columns 22 of the top polyethylene sheet layer 31 as the floor structure of the second-story laboratory 6, further expanding the experimental space and improving the stability of the top polyethylene sheet layer 31. Specific embodiments

[0048] The constructed polyethylene solid radiation shielding device (hereinafter referred to as the polyethylene shielding cabin) is located in the underground experimental hall. The cabin has a net length of 43.9 meters, a width of 7.43 meters, and a height of 5.39 meters. The polyethylene shielding outer sheath weighs a total of 1,800 tons. The polyethylene shielding cabin 5 is a modular shielding device, with all six sides of the cabin encased in 1-meter-thick high-density polyethylene. The cabin's interior is constructed with a composite shielding structure composed of high-purity oxygen-free copper and low-background lead. The outer sheathing of the polyethylene shielding cabin 5 is a hexahedron constructed of staggered stacked polyethylene sheets, designed to shield against neutrons in the underground environment and provide an extremely low radiation background for the experimental equipment within the cabin.

[0049] Cabin plan and section see Figure 2 and Figure 3 The polyethylene shielding cabin 5 is laid out according to the experimental requirements. A front compartment 7 is set at the pedestrian entrance and exit of the cabin for changing clothes and storing items. A two-story laboratory 6 is added on the upper part of the cabin. The six-sided enclosure of the polyethylene shielding cabin space is divided into a ground enclosure, a wall enclosure and a top enclosure according to the location. The utility model adopts targeted composite construction technology for different enclosure locations of the cabin, and provides a construction technology that adapts to the underground environment for the six-sided polyethylene enclosure of the polyethylene shielding cabin 5, which is used to solve the rock seepage, underground fire prevention and cabin internal cleanliness requirements faced by the polyethylene shielding cabin 5 in specific underground spaces.

[0050] Ground maintenance body

[0051] Ground enclosure structure Figure 3 As shown. The polyethylene shielding cabin 5 ground enclosure 1 is set in the foundation pit of the underground experimental hall at an elevation of -1.0m to ensure that the ground elevation of the cabin is consistent with the ground elevation of the experimental hall after the ground enclosure is laid, which is convenient for the transportation of experimental equipment and the entry and exit of personnel. The foundation pit is directly excavated in the underground rock layer of the experimental hall, and the bottom of the pit is lower than other working surfaces, causing the ground seepage in the experimental hall to gather in the pit. In order to ensure that there is no water accumulation in the foundation pit, a circular drainage ditch along the perimeter of the foundation pit and a longitudinal drainage ditch perpendicular to the long side of the foundation pit are set at the bottom of the pit to form a drainage channel 8 in the pit. A drainage ditch is connected to the drainage ditches on both sides of the experimental hall and is connected to the underground drainage system of the entire underground space to discharge the seepage water from the bottom of the pit in time. The side walls of the foundation pit are fully paved with concave and convex drainage boards, and the drainage boards are used to guide the seepage water on the side walls to the circular drainage ditch. A cover plate was laid over the drainage ditch at the bottom of the pit. After leveling the same floor as the rest of the pit with a layer of C30 plain concrete (12), a waterproof mortar layer (13) was laid, followed by a spray-applied waterproof coating (14). A 1-meter-thick polyethylene floor sheet (11) was then installed. A 0.5-mm-thick geotextile insulation layer (15) was applied over the polyethylene floor sheet (11) and glued to the top. After leveling the geotextile, a wear-resistant polyurethane mortar topcoat (16) was applied. After calendering and leveling, the surface layer achieved the cleanliness required for a clean laboratory floor, meeting the experimental conditions within the chamber.

[0052] Wall protection body

[0053] Wall enclosure structure Figure 4 As shown. The polyethylene shielding cabin wall enclosure consists of four sides, two of which are provided with entrances and exits 4. The layout of the entrances and exits 4 is a non-through design in accordance with the shielding requirements, and is used for the transportation of experimental equipment and the entry and exit of personnel. The wall polyethylene board layer 21 is formed by stacking polyethylene blocks, and the thickness of the polyethylene layer is 1m. Steel columns are provided on both sides of the wall polyethylene board layer 21, and diagonal braces are provided between the steel columns to prevent the polyethylene layer from overturning under the action of earthquakes. The outer steel column 22 of the polyethylene shielding cabin is externally mounted with a fireproof board layer 23, which is entirely covered with the wall polyethylene board layer 21 to meet the fire protection requirements of the underground space experimental hall. In the special case of a fire in the cabin, the polyethylene layer with a combustion performance of Class B is completely blocked in the fireproof board layer 23, and the fire will no longer spread in the experimental hall. The fireproof board layer 23 is composed of two layers of fiber-reinforced calcium silicate board with a core of 100mm thick rock wool board, and the fire resistance limit is not less than 3 hours. A 50 mm thick stainless steel surface hard polyurethane sandwich panel is hung on the inner steel column 24 of the polyethylene shielding cabin as a decorative panel layer 25, which covers the steel columns, steel beams, diagonal braces and other structural parts from the inside to meet the cleanliness requirements of the clean laboratory wall inside the cabin.

[0054] Top surface protection body

[0055] The top enclosure structure is as follows Figure 5As shown. The first steel beam 34 and steel grille are provided on the inner steel column 24 of the polyethylene shielding cabin wall as the structural support for the top enclosure. The 1m thick top polyethylene sheet of the top enclosure is staggered and laid on this layer of steel grille. Air ducts, cable trays 33 and clean laboratory ceiling panels 32 are hung under the steel grille. The second steel beam 35 and concrete floor slab 36 are provided on the outer steel column 24 of the polyethylene shielding cabin wall. This layer of steel beams and floor slabs are located on the upper part of the top polyethylene board layer 31, and serve as the floor structure of the additional second-floor laboratory 6. The concrete floor slab 36 also serves as a fireproof material covering the top polyethylene board layer 31, and forms an overall fireproof isolation layer with the fireproof board layer 23 hung on the wall, completely isolating the polyethylene shielding cabin and the test hall.

[0056] The utility model provides a method for constructing an outer protective body of a polyethylene solid radiation shielding device. Through a composite construction method, the method meets the space radiation shielding requirements of the polyethylene solid radiation shielding device in deep earth experiments, and at the same time blocks water seepage from underground rocks for the shielding device, meets the fire protection requirements of underground space, and provides conditions for a clean laboratory to be set up in the shielding device.

[0057] This utility model provides a polyethylene solid radiation shielding enclosure for deep underground laboratories. While meeting the requirements of deep underground experiments, it also offers a targeted solution for the construction of the floor, walls, and ceiling of the enclosure. This fully addresses the specific requirements of rock seepage, material fire resistance, and internal cleanliness faced during the construction of polyethylene solid radiation shielding for deep underground laboratories.

[0058] Although some specific embodiments of the present invention have been described in detail through examples, those skilled in the art will understand that the above examples are for illustration only and are not intended to limit the scope of the present invention. Those skilled in the art will understand that the above embodiments may be modified or some technical features may be replaced with equivalents without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A polyethylene solid radiation shielding device outer protective body for a deep underground laboratory, characterized by: It includes a ground enclosure (1), a wall enclosure (2) and a top enclosure (3); The ground enclosure (1) comprises a thick ground polyethylene board layer (11) laid on the bottom of the polyethylene shielding cabin (5); The wall enclosure (2) comprises a thick wall polyethylene board layer (21) arranged around the outer periphery of the polyethylene shielding cabin (5), the outer surface of the wall polyethylene board layer (21) is covered with a fireproof board layer (23), and the front and side surfaces of the wall enclosure (2) are respectively provided with entrances and exits (4), and each of the entrances and exits (4) is respectively provided with a non-through structure; The top surface enclosure (3) comprises a thick top surface polyethylene board layer (31) laid on the top of the polyethylene shielding cabin (5); The bottom of the wall polyethylene board layer (21) is connected to the outer periphery of the ground polyethylene board layer (11), and the top is connected to the outer periphery of the top polyethylene board layer (31), thereby enclosing a solid radiation shielding device for the deep underground laboratory.

2. The outer protective body of the polyethylene solid radiation shielding device for the deep underground laboratory according to claim 1 is characterized by: A foundation pit is excavated in the underground rock stratum where the polyethylene shielding cabin (5) is to be constructed. A drainage channel (8) is provided at the bottom of the foundation pit, and drainage boards connected to the drainage channel are laid on the side walls. The ground polyethylene board layer (11) is laid on the bottom of the pit, and its upper surface is flush with the ground of the deep underground laboratory.

3. The outer protective body of the polyethylene solid radiation shielding device for the deep underground laboratory according to claim 2 is characterized by: The drainage channel (8) in the pit includes an annular drainage ditch surrounding the foundation pit and a longitudinal drainage ditch perpendicular to the long side of the foundation pit. The bottom of the drainage board is connected to the annular drainage ditch, and the drainage channel is connected to the underground drainage system through the drainage ditch. The drainage channel (8) in the pit is laid with a cover plate, and the ground polyethylene board layer (11) is laid above the cover plate.

4. The outer protective body of the polyethylene solid radiation shielding device for the deep underground laboratory according to claim 1 is characterized by: Anti-overturning steel columns are respectively provided on the inner and outer sides of the wall polyethylene sheet layer (21), diagonal braces are provided between adjacent anti-overturning steel columns, a first steel beam (34) and a steel grid are erected on the top of the inner steel column (24), and the portion of the top polyethylene sheet layer (31) located within the wall enclosure (2) is supported by the first steel beam (34) and the steel grid.

5. The outer protective body of the polyethylene solid radiation shielding device for the deep underground laboratory according to claim 4 is characterized by: The fireproof board layer (23) is hung on the outside of the outer steel column (22), and steel beams and concrete floor slabs (36) are laid above the top polyethylene board layer (31). The concrete floor slab (36) covers the top polyethylene board layer and is connected to the fireproof board layer (23) hung on the outside of the wall polyethylene board to form an integrated fireproof isolation structure.

6. The outer protective body of the polyethylene solid radiation shielding device for a deep underground laboratory according to any one of claims 1 to 5, characterized in that: The ground polyethylene board layer (11), the wall polyethylene board layer (21) and the top polyethylene board layer (31) are respectively composed of multiple layers of polyethylene sheets stacked at staggered joints, and the thickness of the adjacent edges of the ground polyethylene board layer (11), the wall polyethylene board layer (21) and the top polyethylene board layer (31) is not less than the main body thickness of each board layer.

7. The outer protective body of the polyethylene solid radiation shielding device for the deep underground laboratory according to claim 1 is characterized by: A high-purity oxygen-free copper shielding layer and a low-background lead shielding layer are provided inside the ground enclosure (1), the wall enclosure (2) and the top enclosure (3) to form a composite shielding structure.

8. The outer protective body of the polyethylene solid radiation shielding device for the deep underground laboratory according to claim 1 is characterized by: A second-story laboratory (6) is constructed above the top enclosure (3), and a second top steel beam (35) and a concrete floor slab (36) are arranged on the outer steel columns (22) of the top polyethylene board layer (31) as the floor structure of the second-story laboratory (6).

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