Large assembled polyethylene shielding cabin

Abstract

The utility model relates to the technical field of shielding cabins, in particular to a large assembled polyethylene shielding cabin, which is characterized in that a ground polyethylene plate layer, a wall surface polyethylene plate layer and a top surface polyethylene plate layer are respectively formed by stacking a plurality of layers of polyethylene plates in a staggered joint manner, and the first thickness is not equal to the second thickness; the first thickness is the thickness of a top-layer polyethylene plate and a bottom-layer polyethylene plate of the wall surface polyethylene plate layer perpendicular to the plate surface direction, the second thickness is the thickness of a standard polyethylene plate located between the top-layer polyethylene plate and the bottom-layer polyethylene plate, and the first thickness changes in a step shape along the wall surface polyethylene plate layer parallel to the plate surface direction. According to the utility model, the high-density polyethylene plates with different sizes are adopted for staggered-joint non-adhesive stacking of the wall surface polyethylene plate layers, so that the aims that the polyethylene shielding cabin has no through seam and the equivalent length of the seam is minimum can be achieved under the condition that the safety and stability requirements are met, and cosmic rays and radiation penetration are reduced to the greatest extent; and the shielding performance of the polyethylene shielding cabin is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of shielding cabins, in particular to a large assembled polyethylene shielding cabin. Background Art

[0002] The detection of rare events in particle physics, such as dark matter and neutrinos, is a frontier of deep-Earth science, crucial for humanity's exploration of the nature of the universe. The prerequisite for conducting rare-event detection is an environment with extremely low cosmic ray flux and background radiation, typically achieved through the construction of deep-Earth laboratories.

[0003] Existing deep underground laboratories worldwide can be divided into two types: mine-type laboratories, such as the Kamioka Laboratory in Japan and the SNO Laboratory in Canada, utilize laboratories at the bottom of existing mining shafts. The other type, such as the Gran Sasso National Laboratory in Italy and the Jinping Underground Laboratory in China, uses thick mountain cover to shield cosmic rays. Building upon these facilities, further shielding against cosmic rays and ambient radiation is a key research topic.

[0004] High-density polyethylene has a certain shielding effect on atmospheric neutrons and gamma rays. It is usually used as the outermost material of the radiation shielding device. Lead, high-purity oxygen-free copper, etc. are used inside to form a composite shielding cabin to ensure that the innermost material actually used for dark matter detection can be in the most "pure" environment. For example, the Chinese invention patent with publication number CN118407529A provides an outer protective body and construction method for a deep underground laboratory polyethylene solid radiation shielding device. This existing technology forms a solid radiation shielding cabin by enclosing a thick ground polyethylene board layer, a wall polyethylene board layer and a top polyethylene board layer. The ground polyethylene board The layer, wall polyethylene board layer and top polyethylene board layer are respectively composed of multiple layers of polyethylene sheets stacked at staggered seams; for the design of the polyethylene shielding cabin, it is usually required that the polyethylene shielding cabin is as thick as possible on each side, the gaps in the panels on each side of the cabin are as few as possible, and there are no through gaps on each side in the thickness direction perpendicular to the panel surface that can be penetrated by neutrons. However, in this existing technology, the structure of each side constructed by staggered stacking of multiple layers of polyethylene sheets can only meet the simple requirement of no through gaps, and the degree of weakening of cosmic rays and radiation penetration is limited; therefore, how to further improve the shielding performance of the polyethylene shielding cabin is a technical problem that urgently needs to be solved. Utility Model Content

[0005] The purpose of the utility model is to provide a large assembled polyethylene shielding cabin. On the basis of staggered stacking of multiple layers of polyethylene sheets, polyethylene sheets of different sizes are used to construct the polyethylene sheet layers on the wall, so as to achieve the goal of having no through seams in the polyethylene shielding cabin and minimizing the equivalent length of the gaps, thereby minimizing the penetration of cosmic rays and radiation, and further improving the shielding performance of the polyethylene shielding cabin.

[0006] The embodiment of the present utility model is realized through the following technical scheme: a large assembled polyethylene shielding cabin, including a ground enclosure, a wall enclosure and a top enclosure, the ground enclosure including a ground polyethylene board layer laid on the bottom of the polyethylene shielding cabin, the wall enclosure including a wall polyethylene board layer surrounded by the outer periphery of the polyethylene shielding cabin, the top enclosure including a top polyethylene board layer laid on the top of the polyethylene shielding cabin, the ground polyethylene board layer, the wall polyethylene board layer and the top polyethylene board layer are respectively composed of multiple layers of polyethylene sheets stacked with staggered seams, the first thickness is not equal to the second thickness, the first thickness is the thickness of the top polyethylene sheet and the bottom polyethylene sheet of the wall polyethylene board layer perpendicular to the board surface direction, the second thickness is the thickness of the standard polyethylene sheet located between the top polyethylene sheet and the bottom polyethylene sheet, and the first thickness changes in a stepped manner along the wall polyethylene board layer parallel to the board surface direction.

[0007] According to a preferred embodiment, a fireproof layer is laid inside the polyethylene shielding cabin.

[0008] According to a preferred embodiment, the thickness of the ground polyethylene board layer, the wall polyethylene board layer and the top polyethylene board layer are all greater than or equal to 1 meter.

[0009] According to a preferred embodiment, the thickness of the polyethylene board layers of the ground polyethylene board layer, the wall polyethylene board layer and the top polyethylene board layer are all less than or equal to 20 cm.

[0010] According to a preferred embodiment, at least one side of the wall enclosure is provided with an entrance and exit, and the entrance and exit is a non-through structure.

[0011] According to a preferred embodiment, the wall enclosure includes an exterior wall and an interior wall;

[0012] The outer wall is composed of a first outer wall W1, a second outer wall W2, a third outer wall W3 and a fourth outer wall W4. The first outer wall W1 and the second outer wall W2, the second outer wall W2 and the third outer wall W3, and the third outer wall W3 and the fourth outer wall W4 are connected end to end. The inner wall is arranged on the inner side of the non-through structure, vertically connected to the first outer wall W1 and staggered and parallel to the fourth outer wall W4.

[0013] According to a preferred embodiment, the length of the first outer wall W1 is greater than or equal to the length of the third outer wall W3.

[0014] According to a preferred embodiment, both the inner side and the outer side of the polyethylene shielding cabin are supported by support structures.

[0015] According to a preferred embodiment, the support structure is composed of an external vertical steel frame, an internal vertical steel frame, external steel frame cross braces and internal steel frame cross braces;

[0016] The external vertical steel frame is arranged on the outside of the wall enclosure, the internal vertical steel frame is arranged on the inside of the wall enclosure and in the middle of the polyethylene shielding cabin, the external steel frame cross brace is arranged on the outside of the top enclosure and connected to the external vertical steel frame, and the internal steel frame cross brace is arranged on the inside of the top enclosure and connected to the internal vertical steel frame.

[0017] According to a preferred embodiment, an embedding groove is opened on the ground polyethylene board layer corresponding to the internal vertical steel frame, and the connecting gap between the internal vertical steel frame and the embedding groove is filled with filling material.

[0018] The technical solution of a large assembled polyethylene shielding cabin provided by the utility model has at least the following advantages and beneficial effects: the utility model adopts high-density polyethylene sheets of different sizes to stack the polyethylene sheet layers on the wall in a staggered and non-adhesive manner, which can achieve the goal of having no through seams in the polyethylene shielding cabin and minimizing the equivalent length of the gap while meeting the safety and stability requirements, thereby minimizing the penetration of cosmic rays and radiation, and further improving the shielding performance of the polyethylene shielding cabin. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of a large assembled polyethylene shielding cabin provided in Example 1 of the present utility model;

[0020] Figure 2 A top view of the wall enclosure provided in Example 2 of the present utility model;

[0021] Figure 3 A schematic diagram of the partial stacking of the top polyethylene sheet layer and the ground polyethylene sheet layer provided in Example 4 of the present utility model;

[0022] Figure 4 A schematic diagram of the partial stacking of polyethylene board layers on a wall provided in Example 4 of the present utility model;

[0023] Figure 5 This is the final rendering of the polyethylene shielding cabin provided in Example 4 of the present utility model;

[0024] Icon: 1-top enclosure, 2-interior wall, 3-exterior wall, 4-ground enclosure, 5-polyethylene sheet, 6-vertical steel frame, 7-internal steel frame cross brace, 8-exterior steel frame cross brace, 9-polyethylene shielding cabin, 10-support structure. DETAILED DESCRIPTION

[0025] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0026] Example 1

[0027] Figure 1 This is a schematic diagram of the overall structure of a large assembled polyethylene shielding cabin provided by the embodiment of the utility model. Figure 1 As shown, the polyethylene shielding cabin 9 includes a ground enclosure 4, a wall enclosure and a top enclosure 1.

[0028] Furthermore, the ground enclosure 4 includes a ground polyethylene board layer laid on the bottom of the polyethylene shielding cabin 9, the wall enclosure includes a wall polyethylene board layer surrounded by the outer periphery of the polyethylene shielding cabin 9, and the top enclosure 1 includes a top polyethylene board layer laid on the top of the polyethylene shielding cabin 9; the top polyethylene board layer is parallel to the ground polyethylene board layer, the bottom of the wall polyethylene board layer is connected to the outer periphery of the ground polyethylene board layer, and the top of the wall polyethylene board layer is connected to the outer periphery of the top polyethylene board layer.

[0029] Among them, the ground polyethylene board layer, wall polyethylene board layer and top polyethylene board layer are respectively composed of multiple layers of polyethylene sheets 5 stacked with staggered seams. The first thickness is not equal to the second thickness. The first thickness is the thickness of the top polyethylene sheet 5 and the bottom polyethylene sheet 5 of the wall polyethylene board layer perpendicular to the board surface direction. The second thickness is the thickness of the standard polyethylene sheet 5 located between the top polyethylene sheet 5 and the bottom polyethylene sheet 5. The first thickness changes in a step-like manner along the wall polyethylene board layer parallel to the board surface direction.

[0030] In addition, at least one side of the wall enclosure is provided with an entrance and exit, and the entrance and exit is a non-through structure, so that the polyethylene shielding cabin 9 is closed to shield cosmic rays.

[0031] Based on the above embodiment, the provided polyethylene shielding cabin 9 can achieve the goal of having no through-slits and minimizing the equivalent length of the gaps while meeting the safety and stability requirements, thereby minimizing the penetration of cosmic rays and radiation, further improving the shielding performance of the polyethylene shielding cabin 9, and meeting the radiation shielding conditions of cutting-edge physics experiments with extremely low radiation background, adapting to extremely deep underground environments, and meeting the needs of cutting-edge physics research such as particle physics, astrophysics, and cosmology.

[0032] Example 2

[0033] This embodiment is based on the technical solution provided in Example 1, and describes the entrance and exit of the polyethylene shielding cabin 9:

[0034] In this embodiment, the wall enclosure includes an outer wall 3 and an inner wall 2 .

[0035] Among them, see Figure 2 As shown, the outer wall 3 is composed of a first outer wall 3W1, a second outer wall 3W2, a third outer wall 3W3 and a fourth outer wall 3W4, the first outer wall 3W1 and the second outer wall 3W2, the second outer wall 3W2 and the third outer wall 3W3, and the third outer wall 3W3 and the fourth outer wall 3W4 are connected end to end, and the inner wall 2 is arranged on the inner side of the non-through structure, vertically connected to the first outer wall 3W1 and staggered and parallel to the fourth outer wall 3W4, dividing the polyethylene shielding cabin 9 into a connected walk-in area and a test area.

[0036] Furthermore, the length of the first outer wall 3W1 is greater than or equal to the length of the third outer wall 3W3, and the portion larger than the third outer wall 3W3 can be used to design a front warehouse for changing clothes and storing items, which will not be elaborated here.

[0037] Example 3

[0038] This embodiment is based on the technical solution provided in Example 1, and describes the supporting structure 10 of the polyethylene shielding cabin 9:

[0039] In this embodiment, both the inner and outer sides of the polyethylene shielding cabin 9 are supported by rigid frames.

[0040] Among them, see Figure 1 As shown, the support structure 10 is composed of an external vertical steel frame 6, an internal vertical steel frame 6, an external steel frame cross brace 8 and an internal steel frame cross brace 7; the external vertical steel frame 6 is arranged on the outside of the wall enclosure, the internal vertical steel frame 6 is arranged on the inside of the wall enclosure and in the middle of the polyethylene shielding cabin 9, and are arranged at a preset spacing, the external steel frame cross brace 8 is arranged on the outside of the top enclosure 1 and connected to the external vertical steel frame 6, the internal steel frame cross brace 7 is arranged on the inside of the top enclosure 1 and connected to the internal vertical steel frame 6, the spacing of the internal steel frame cross brace 7 is less than the minimum width of the polyethylene sheet 5 of the top polyethylene sheet layer, which is 1 meter in this embodiment, and the spacing of the external steel frame cross brace 8 is selected according to the actual stress conditions, which is 1 meter in this embodiment.

[0041] Furthermore, the ground polyethylene sheet layer is provided with a groove corresponding to the internal vertical steel frame 6, and the gap between the internal vertical steel frame 6 and the groove is filled with a filling material, so that the overall structure meets the sealing requirements. Specifically, in one possible implementation of this embodiment, the support structure 10 is made of hot-rolled H-shaped steel. The ground polyethylene sheet layer is initially designed with a groove that matches the shape of the H-shaped steel gap for the internal vertical steel frame 6 to be embedded and installed. After the vertical steel frame 6 is embedded and installed, this embodiment also lays a fireproof layer on the ground polyethylene sheet layer. The fireproof layer can be made of fireproof cotton. In addition, this embodiment also lays fireproof cotton at the welding points between the external vertical steel frame 6, the internal vertical steel frame 6, the external steel frame cross brace 8, and the internal steel frame cross brace 7. Regarding the filling material used, in this embodiment, polyethylene blocks are used to fill the connection gaps, and polyethylene powder with a mesh size of not less than 50 is mixed with epoxy resin glue to fill the connection gaps densely, with a filling depth of not less than 5 mm.

[0042] Example 4

[0043] This embodiment is based on the technical solution provided in Example 1, and describes the design parameters of the ground enclosure 4, the wall enclosure, and the top enclosure 1:

[0044] In this embodiment, the constructed polyethylene shielding cabin 9 is located in the experimental hall of the underground space. The parameters of the cabin after completion are as follows: 52 meters in length, 10 meters in width, and 8 meters in height. The thickness of the ground polyethylene board layer, the wall polyethylene board layer, and the top polyethylene board layer are all greater than or equal to 1 meter.

[0045] The length of the first exterior wall 3W1 is greater than or equal to the length of the third exterior wall 3W3, the length of the third exterior wall 3W3 is 52 meters, and the length of the first exterior wall 3W1 is 55 meters; the length of the interior wall 2 and the fourth exterior wall 3W4 is greater than or equal to half the length of the second exterior wall 3W2. In this embodiment, the length of the second exterior wall 3W2 is 10 meters, and the length of the interior wall 2 and the fourth exterior wall 3W4 is 6 meters. The vertical distance between the centers of the interior wall 2 and the fourth exterior wall 3W4 is 3 meters, that is, the width of the walk-in area between the fourth exterior wall 3W4 and the interior wall 2 is 2 meters.

[0046] Regarding the polyethylene sheet materials 5 used on each surface, in this embodiment, the thickness of the polyethylene sheet materials 5 of the ground polyethylene sheet layer, the wall polyethylene sheet layer and the top polyethylene sheet layer is less than or equal to 20 cm, wherein the standard size of the polyethylene sheet materials 5 of the ground polyethylene sheet layer and the top polyethylene sheet layer is 3×1.8 meters, and the standard size of the polyethylene sheet materials 5 of the wall polyethylene sheet layer is 2×0.25 meters.

[0047] In a possible implementation of this embodiment, see Figure 3 As shown, Figure 3Figure (a) is a cross-sectional view of the polyethylene sheet 5 of the ground polyethylene sheet layer and the top polyethylene sheet layer, and Figure (b) is a top view of the assembled corner dislocation of the ground polyethylene sheet layer and the top polyethylene sheet layer; the ground polyethylene sheet layer and the top polyethylene sheet layer are constructed using 10 layers of polyethylene sheet 5, and the polyethylene sheet 5 of the ground polyethylene sheet layer and the top polyethylene sheet layer have no through gaps in the direction perpendicular to the board surface (direction Z), and the length of the continuous gap is no greater than the thickness of the polyethylene sheet 5 used, that is, 10 cm; see Figure 4 As shown, Figure 4 Figure (a) is a side view of the polyethylene sheet 5 of the wall polyethylene sheet layer, and Figure (b) is a cross-sectional view; the wall polyethylene sheet 5 is constructed using 4 layers of polyethylene sheets 5. The polyethylene sheets 5 of the wall polyethylene sheet layer have no through gaps in the direction parallel to the board surface (direction Y) and perpendicular to the board surface, and the length of the continuous gap is no greater than the width of the polyethylene sheet 5 used, and the length of the continuous gap parallel to the board surface is no greater than 25 cm. The final effect is shown in FIG. Figure 5 shown.

[0048] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A large assembled polyethylene shielding cabin, comprising a ground enclosure (4), a wall enclosure and a top enclosure (1), wherein the ground enclosure (4) comprises a ground polyethylene sheet layer laid on the bottom of the polyethylene shielding cabin (9), the wall enclosure comprises a wall polyethylene sheet layer arranged around the periphery of the polyethylene shielding cabin (9), and the top enclosure (1) comprises a top polyethylene sheet layer laid on the top of the polyethylene shielding cabin (9), and the ground polyethylene sheet layer, the wall polyethylene sheet layer and the top polyethylene sheet layer are respectively formed by staggered stacking of multiple layers of polyethylene sheets (5), characterized in that: The first thickness is not equal to the second thickness. The first thickness is the thickness of the top polyethylene sheet (5) and the bottom polyethylene sheet (5) of the wall polyethylene sheet layer perpendicular to the board surface direction. The second thickness is the thickness of the standard polyethylene sheet (5) located between the top polyethylene sheet (5) and the bottom polyethylene sheet (5). The first thickness changes in a step-like manner along the wall polyethylene sheet layer parallel to the board surface direction.

2. The large assembled polyethylene shielding cabin according to claim 1, characterized in that: The thickness of the ground polyethylene board layer, the wall polyethylene board layer and the top polyethylene board layer are all greater than or equal to 1 meter.

3. The large assembled polyethylene shielding cabin according to claim 2, characterized in that: The thickness of the polyethylene sheet (5) of the ground polyethylene sheet layer, the wall polyethylene sheet layer and the top polyethylene sheet layer is less than or equal to 20 cm.

4. The large assembled polyethylene shielding cabin according to claim 1, characterized in that: At least one side of the wall enclosure is provided with an entrance and exit, and the entrance and exit is a non-through structure.

5. The large assembled polyethylene shielding cabin according to claim 4, characterized in that: The wall enclosure includes an outer wall (3) and an inner wall (2); The outer wall (3) is composed of a first outer wall (3) W1, a second outer wall (3) W2, a third outer wall (3) W3 and a fourth outer wall (3) W4. The first outer wall (3) W1 is connected to the second outer wall (3) W2, the second outer wall (3) W2 is connected to the third outer wall (3) W3, and the third outer wall (3) W3 is connected to the fourth outer wall (3) W4. The inner wall (2) is arranged on the inner side of the non-through structure, is vertically connected to the first outer wall (3) W1, and is staggered and parallel to the fourth outer wall (3) W4.

6. The large assembled polyethylene shielding cabin according to claim 5, characterized in that: The length of the first outer wall (3) W1 is greater than or equal to the length of the third outer wall (3) W3.

7. The large assembled polyethylene shielding cabin according to claim 1, characterized in that: The inner side and the outer side of the polyethylene shielding cabin (9) are both supported by a supporting structure (10).

8. The large assembled polyethylene shielding cabin according to claim 7, characterized in that: The support structure (10) is composed of an external vertical steel frame (6), an internal vertical steel frame (6), an external steel frame cross brace (8) and an internal steel frame cross brace (7); The external vertical steel frame (6) is arranged on the outside of the wall enclosure, the internal vertical steel frame (6) is arranged on the inside of the wall enclosure and in the middle of the polyethylene shielding cabin (9), the external steel frame cross brace (8) is arranged on the outside of the top enclosure (1) and connected to the external vertical steel frame (6), and the internal steel frame cross brace (7) is arranged on the inside of the top enclosure (1) and connected to the internal vertical steel frame (6).

9. The large assembled polyethylene shielding cabin according to claim 8, characterized in that: The ground polyethylene plate layer is provided with an embedding groove corresponding to the internal vertical steel frame (6), and the connection gap between the internal vertical steel frame (6) and the embedding groove is filled with a filling material.

10. The large assembled polyethylene shielding cabin according to claim 1, characterized in that: A fireproof layer is provided inside the polyethylene shielding cabin (9).

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