Radiation shielding wall and its construction method

Abstract

This invention relates to a radiation shielding wall and its construction method. The radiation shielding wall includes a wall body, precast blocks, and a filling layer. A cavity is provided within the wall body. The precast blocks are placed within the cavity, and a gap exists between the precast blocks and the cavity wall. The filling layer fills the gap between the precast blocks and the cavity wall. By creating a cavity within the wall body, placing precast blocks within the cavity, and filling the gap between the precast blocks and the cavity wall with the filling layer, the radiation shielding wall can be constructed in layers. This reduces the thickness of the concrete required for the wall without reducing its overall thickness, significantly lowering the hydration temperature of the large-volume concrete, reducing the temperature difference between the inside and outside of the wall, and effectively reducing the risk of cracking while ensuring the protective performance of the radiation shielding wall. Lowering the hydration temperature of the large-volume concrete eliminates the need for many measures to reduce the heat of hydration, thus reducing the construction difficulty of the radiation shielding wall.

Description

Technical Field

[0001] This invention relates to the field of building engineering technology, and in particular to a radiation shielding wall and its construction method. Background Technology

[0002] Heavy ion therapy devices are widely recognized as one of the most ideal cancer treatment devices of the 21st century. Due to radiation protection requirements, they are typically located in hospital basements. The treatment rooms and heavy ion accelerator areas generally use ultra-thick reinforced concrete walls as radiation shielding walls, with thicknesses ranging from 1.5m, 2m, 2.6m, 3.9m, to 4.3m.

[0003] Because of their extreme thickness, these reinforced concrete radiation shielding walls experience high hydration temperatures at the center of the concrete during construction, while the surface temperature remains low. This significant temperature difference makes the walls highly susceptible to thermal cracks. These cracks not only cause basement leaks but can also reactivate groundwater in the heavy ion accelerator area, polluting the environment. Furthermore, cracks reduce the effectiveness of radiation protection, failing to meet requirements and compromising the safety of medical staff and patients. Summary of the Invention

[0004] Therefore, it is necessary to provide a radiation shielding wall and its construction method to address the problem of cracking in large, thick walls.

[0005] On the one hand, this application provides a radiation shielding wall, comprising:

[0006] The wall has a cavity inside;

[0007] A precast block, the precast block being disposed in the cavity, and a gap being formed between the precast block and the cavity wall; and,

[0008] A filling layer that fills the gap.

[0009] The aforementioned radiation shielding wall utilizes a cavity within its structure. Precast blocks are placed within these cavities, and a filling layer is used to fill the gaps between the blocks and the cavity walls. This allows for layered construction of the radiation shielding wall, reducing the required concrete thickness without compromising the overall wall thickness. This significantly lowers the hydration temperature of the large-volume concrete, reducing the temperature difference between the inside and outside of the wall and effectively minimizing the risk of cracking. This ensures the wall's protective performance, prevents leakage of radiation-activated water, and avoids environmental pollution. Furthermore, lowering the hydration temperature of the large-volume concrete eliminates the need for many heat-reducing measures, thus simplifying construction. The internal cavity also significantly reduces the amount of reinforcement required, lowering overall project costs.

[0010] The technical solution of this application will be further described below:

[0011] In one embodiment, the cavity is provided with a plurality of prefabricated blocks, which are arranged in the cavity along the length and height of the wall to form a row of prefabricated walls.

[0012] In one embodiment, the cavity is provided with at least two rows of the prefabricated walls, and two adjacent rows of the prefabricated walls abut each other along the width direction of the wall.

[0013] In one embodiment, in two adjacent rows of prefabricated walls, the gap between two adjacent prefabricated blocks in one row of prefabricated walls is opposite to the prefabricated blocks in the other row of prefabricated walls.

[0014] In one embodiment, the wall has at least two cavities along its length, each cavity having the precast block and the filling layer, and adjacent cavities are separated by a partition wall, the filling layer also filling the gap between the precast block and the partition wall.

[0015] In one embodiment, the wall is formed in the width direction by an inner wall and an outer wall separated by the cavity, and the partition wall connects the inner wall and the outer wall.

[0016] In one embodiment, the wall is provided with at least two cavities along the height direction, and each cavity is provided with the precast block and the filling layer.

[0017] In one embodiment, two adjacent cavities are separated by a strip plate used to connect the floor slab, and the filling layer also fills the gap between the precast block and the strip plate.

[0018] In one embodiment, the precast block is provided with lifting rings for hoisting.

[0019] In one embodiment, the precast block has a groove, and the lifting ring is disposed in the groove.

[0020] On the other hand, this application also provides a method for constructing a radiation shielding wall, including the following steps:

[0021] Precast blocks;

[0022] Construction of walls with cavities;

[0023] The precast block is hoisted into the cavity;

[0024] A filling layer is placed between the cavity wall and the precast block.

[0025] In one embodiment, the step of prefabricating the prefabricated block includes:

[0026] Precast blocks are made of concrete;

[0027] Precast blocks are soaked in water for curing.

[0028] In one embodiment, the step of hoisting the precast block into the cavity includes:

[0029] At least two rows of the precast blocks are placed inside the wall, with adjacent rows of precast blocks staggered.

[0030] In one embodiment, the step of constructing the wall with the cavity includes:

[0031] Set up a template within the pre-defined wall area;

[0032] Reinforcing bars are erected in the template and concrete is poured;

[0033] Watering maintenance;

[0034] Remove the formwork to obtain a wall with a cavity.

[0035] In one embodiment, the step of filling the cavity wall and the precast block with a filling layer 30 includes:

[0036] The gap between the precast blocks and the wall is filled with C25 fine aggregate concrete and compacted by vibration to form a filling layer.

[0037] In one embodiment, the construction method of the radiation shielding wall further includes:

[0038] Install slab strips at the corresponding floor slab locations.

[0039] The aforementioned construction method for radiation shielding walls involves creating cavities within the wall structure, placing precast blocks within these cavities, and filling the gaps between the precast blocks and the cavity walls with a filling layer. This allows the radiation shielding wall to be constructed in layers, reducing the required thickness of the concrete pour without compromising the overall thickness of the wall. This significantly lowers the hydration temperature within the large volume of concrete, reducing the temperature difference between the inside and outside of the wall, effectively reducing the risk of cracking, ensuring the protective performance of the radiation shielding wall, preventing leakage of radiation-activated water, and avoiding environmental pollution. Furthermore, lowering the hydration temperature within the large volume of concrete eliminates the need for many measures to reduce the heat of hydration, thus reducing the construction difficulty of the radiation shielding wall. Additionally, the internal cavities significantly reduce the amount of reinforcement required for the wall, lowering the project cost. Attached Figure Description

[0040] The accompanying drawings, which form part of this application, 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 improper limitation of the invention.

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 A cross-sectional view of a radiation shielding wall in a horizontal section, as shown in one embodiment;

[0043] Figure 2 A cross-sectional view of a radiation shielding wall in a vertical section, as shown in one embodiment;

[0044] Figure 3 A side view of a prefabricated block according to one embodiment;

[0045] Figure 4 This is a top view of a prefabricated block according to one embodiment.

[0046] Explanation of reference numerals in the attached figures:

[0047] 10. Wall; 11. Cavity; 12. Exterior wall; 13. Interior wall; 20. Precast wall; 21. Precast block; 211. Lifting ring; 212. Groove; 30. Filling layer; 40. Partition wall; 50. Panel strip. Detailed Implementation

[0048] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0049] Specifically, one embodiment of this application provides a radiation shielding wall. It is worth noting that the structure of this radiation shielding wall can also be applied to other large-volume, ultra-thick walls 10. See also... Figure 1 , Figure 1A schematic diagram of a radiation shielding wall according to an embodiment of the present invention is shown. Specifically, the radiation shielding wall of one embodiment includes a wall body 10, a prefabricated block 21, and a filling layer 30. The wall body 10 has a cavity 11. The prefabricated block 21 is disposed in the cavity 11, and a gap exists between the prefabricated block 21 and the cavity wall of the cavity 11. The filling layer 30 fills the gap between the prefabricated block 21 and the cavity wall of the cavity 11.

[0050] Specifically, in this embodiment, the wall 10 is a reinforced concrete structure with a cavity 11 in the middle. The overall thickness of the wall 10 is greater than 2m, and the width of the cavity 11 accounts for 3 / 4 to 4 / 5 of the thickness of the wall 10. The precast blocks 21 are made of C25 concrete, and the reinforcement of the precast blocks 21 can be the same as plain concrete reinforcement, with a reinforcement ratio of 0.05%. The filling layer 30 is made of C25 fine aggregate concrete. The thickness of the filling layer 30, i.e., the gap distance between the precast blocks 21 and the cavity wall of the cavity 11, is 150mm to 200mm.

[0051] The aforementioned radiation shielding wall utilizes a cavity 11 within the wall body 10, with precast blocks 21 placed within the cavity 11. A filling layer 30 is then filled into the gap between the precast blocks 21 and the cavity wall of the cavity 11. This allows the radiation shielding wall to be constructed in layers, reducing the required thickness of the concrete poured for the wall body 10 without reducing the overall thickness of the wall. This significantly lowers the hydration temperature within the large volume of concrete, reducing the temperature difference between the inside and outside of the wall body 10, effectively reducing the risk of cracking, ensuring the protective performance of the radiation shielding wall, preventing leakage of radiation-activated water, and avoiding environmental pollution. Furthermore, lowering the hydration temperature within the large volume of concrete eliminates the need for many measures to reduce the heat of hydration, thus reducing the construction difficulty of the radiation shielding wall. Additionally, the cavity 11 within the wall body 10 significantly reduces the reinforcement required for the wall body 10, lowering the project cost.

[0052] See Figure 1 as well as Figure 2 Furthermore, the cavity 11 is provided with a plurality of prefabricated blocks 21, which are arranged in the cavity 11 along the length and height of the wall 10 to form a row of prefabricated walls 20. By arranging a plurality of prefabricated blocks 21 to form a prefabricated wall 20, the volume of a single prefabricated block 21 can be effectively reduced, which facilitates the fabrication and hoisting of the prefabricated blocks 21.

[0053] Preferably, at least two rows of prefabricated walls 20 are provided within the cavity 11, with adjacent rows of prefabricated walls 20 abutting each other along the width direction of the wall 10. For example, in this embodiment, each cavity 11 is provided with two rows of prefabricated walls 20, with the two rows of prefabricated walls 20 abutting each other along the width direction of the wall 10, thereby increasing the overall strength and radiation protection performance of the radiation shielding wall.

[0054] See also Figure 1 as well as Figure 2 The precast blocks 21 of two adjacent rows of precast walls 20 are staggered. That is, in two adjacent rows of precast walls 20, the gap between two adjacent precast blocks 21 in one row of precast walls 20 is opposite to the precast blocks 21 in the other row of precast walls 20, thereby preventing radiation from directly escaping from the gap between two adjacent precast blocks 21 and improving the radiation protection capability of the radiation shielding wall.

[0055] Further, see Figure 1 The wall 10 has at least two cavities 11 along its length. Each cavity 11 contains a precast block 21 and a filling layer 30. Adjacent cavities 11 are separated by a partition wall 40, and the filling layer 30 fills the gap between the precast block 21 and the partition wall 40. For example, in this embodiment, the wall 10 has three cavities 11 along its length, with adjacent cavities 11 separated by a partition wall 40. Each cavity 11 contains two rows of precast blocks 21, and the space between the precast blocks 21 and the cavity wall of the cavity 11 is filled with the filling layer 30. By dividing the interior of the wall 10 into multiple cavities 11 along its length using partition walls 40, the overall strength of the wall 10 is prevented from being affected by an excessively long single cavity 11.

[0056] Specifically, the wall 10 forms an inner wall 13 and an outer wall 12 separated by the cavity 11 in the width direction, and the partition wall 40 connects the inner wall 13 and the outer wall 12. Connecting the inner wall 13 and the outer wall 12 through the partition wall 40 improves the stability and mechanical properties of the wall 10. Preferably, the thicknesses of the inner wall 13 and the outer wall 12 can be equal or unequal. The thickness of either the inner wall 13 or the outer wall 12 is 1m to 1.2m. The reinforcement of the inner wall 13 can be determined according to structural requirements; for example, the horizontal and vertical reinforcement ratio of the wall 10 is 0.2%. The reinforcement of the outer wall 12 needs to be calculated considering soil and water conditions. The reinforcement ratio of the partition wall 40 can be 0.6%.

[0057] See Figure 2 The wall 10 has at least two cavities 11 along its height, each cavity 11 containing a precast block 21 and a filling layer 30. Adjacent cavities 11 are separated by a strip 50, which connects to the floor slab. The filling layer 30 also fills the gap between the precast block 21 and the strip 50. The strip 50 divides the interior of the wall 10 into multiple cavities 11 along its height, preventing individual cavities 11 from being too high and affecting the overall strength of the wall 10. Specifically, the reinforcement ratio of the strip 50 is 0.4%.

[0058] Further, see Figure 3 as well as Figure 4 The precast block 21 is provided with lifting rings 211 for hoisting. Preferably, the precast block 21 is provided with multiple lifting rings 211, which are evenly distributed on the upper surface of the precast block 21. For example, in this embodiment, each precast block 21 is provided with four lifting rings 211, which are evenly distributed at the four corners of the precast block 21, thereby ensuring that the precast block 21 remains balanced during hoisting. Further, the precast block 21 is provided with a groove 212, and the lifting rings 211 are disposed in the groove 212, thereby preventing the lifting rings 211 from protruding from the surface of the precast block 21 and ensuring that two adjacent precast blocks 21 can abut tightly.

[0059] Furthermore, this application also provides a method for constructing a radiation shielding wall, comprising the following steps:

[0060] S110: Precast block 21;

[0061] S120: Construct a wall 10 with a cavity 11;

[0062] S130: The precast block 21 is hoisted into the cavity 11;

[0063] S140: A filling layer 30 is provided between the cavity wall of the cavity 11 and the precast block 21.

[0064] Specifically, the steps for prefabricating the precast blocks 21 include:

[0065] S111: Precast blocks 21 are made of concrete;

[0066] Specifically, the precast block 21 is made of C25 concrete, and the reinforcement of the precast block 21 can be the same as plain concrete reinforcement, with an outer reinforcement ratio of 0.05%. The size of the precast block 21 should be designed in conjunction with the size of the cavity 11, and the maximum lifting weight of the construction site crane should also be considered. In this embodiment, the size of the precast block 21 is 1.5m x 1.0m x 0.8m.

[0067] S112 will soak precast block 21 in water for curing.

[0068] Specifically, in order to reduce the shrinkage of precast block 21, precast block 21 needs to be soaked in water for more than 28 days to basically achieve the same heat of hydration in the concrete of precast block 21 as the ambient temperature, prevent precast block 21 from cracking, and ensure the shrinkage stability of precast block 21.

[0069] Furthermore, the step of constructing the wall 10 having the cavity 11 includes:

[0070] S121: Set up a template within the pre-defined wall 10 area;

[0071] Specifically, the area of ​​the wall 10 is pre-planned, and the outer contour of the wall 10 and the internal cavity 11 are enclosed by the template. Further, in this embodiment, the wall 10 is 4.3m thick, 26.7m long, and 30.9m high. Three cavities 11 are made along the length of the wall 10, specifically, the width and length of the three cavities 11 are 2.3m x 6.3m, 2.3m x 9.5m, and 2.3m x 6.3m, respectively. The inner wall 13 is 1m thick, and the outer wall 12 is 1.2m thick.

[0072] Furthermore, a partition wall 40 is provided between two adjacent cavities 11 to separate them. The partition wall 40 divides the interior of the wall 10 into multiple cavities 11 along its length, preventing a single cavity 11 from being too long and affecting the overall strength of the wall 10. More specifically, the partition wall 40 connects the inner wall 13 and the outer wall 12. Connecting the inner wall 13 and the outer wall 12 of the wall 10 via the partition wall 40 improves the stability and mechanical properties of the wall 10. Preferably, the reinforcement ratio of the partition wall 40 can be 0.6%.

[0073] S122: Steel bars are erected in the template and concrete is poured;

[0074] Specifically, the reinforcement of wall 10 is as follows: the reinforcement of inner wall 13 is as follows according to the structural requirements. For example, the reinforcement ratio of wall 10 in the horizontal and vertical directions is 0.2%. The reinforcement of outer wall 12 needs to be calculated based on the consideration of soil and water conditions.

[0075] S123: Watering maintenance;

[0076] By watering the wall 10 for curing, cracking of the precast blocks 21 can be prevented, and the shrinkage of the precast blocks 21 can be ensured to be stable.

[0077] S124: Remove the template to obtain a wall 10 with a cavity 11.

[0078] Specifically, after approximately 14 days of curing, the formwork can be removed to complete the wall 10 at a height of one floor.

[0079] Furthermore, the step of hoisting the precast block 21 into the cavity 11 includes:

[0080] S131: At least two rows of the precast blocks 21 are placed inside the wall 10, with the precast blocks 21 in adjacent rows arranged in a staggered manner.

[0081] Specifically, in two adjacent rows of precast blocks 21, the gap between two adjacent precast blocks 21 in one row is opposite to the precast blocks 21 in the other row, thereby preventing radiation from directly escaping from the gap between two adjacent precast blocks 21 and improving the radiation protection capability of the radiation shielding wall.

[0082] Further: the step of filling the cavity wall of the cavity 11 and the precast block 21 with a filling layer 30 includes:

[0083] S141: The gap between the precast block 21 and the wall 10 is filled with C25 fine stone concrete and compacted by vibration to form a filling layer 30.

[0084] Furthermore, the construction methods for radiation shielding walls also include:

[0085] S150: Set a slab strip 50 at the corresponding floor slab position.

[0086] Specifically, the strip 50 not only separates two adjacent cavities 11 along the height of the wall 10, preventing a single cavity 11 from being too high and affecting the overall strength of the wall 10, but also strengthens the connection between the wall 10 and the floor slab or basement floor slab, further improving the strength and stability of the protective wall. Preferably, the thickness of the strip 50 is 0.8m. The reinforcement ratio of the strip 50 is 0.4%.

[0087] Furthermore, after the floor beams and slabs are completed, the construction of the walls 10 on the other floors above is repeated according to steps S110-S150. Finally, the radiation shielding wall 10 is obtained.

[0088] The aforementioned construction method for the radiation shielding wall involves creating a cavity 11 within the wall body 10, placing precast blocks 21 within the cavity 11, and filling the gap between the precast blocks 21 and the cavity wall 11 with a filling layer 30. This allows the radiation shielding wall to be constructed in layers, reducing the required thickness of the concrete poured for the wall body 10 without reducing the overall thickness of the wall. This significantly lowers the hydration temperature within the large volume of concrete, reducing the temperature difference between the inside and outside of the wall body 10, thereby effectively reducing the risk of cracking, ensuring the protective performance of the radiation shielding wall, preventing leakage of radiation-activated water, and avoiding environmental pollution. Simultaneously, lowering the hydration temperature within the large volume of concrete eliminates the need for many measures to reduce the heat of hydration, thus reducing the construction difficulty of the radiation shielding wall. Furthermore, the cavity 11 inside the wall body 10 significantly reduces the reinforcement required for the wall body 10, lowering the project cost.

[0089] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0090] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

[0091] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the 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. Therefore, they should not be construed as limitations on this invention.

[0092] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0093] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0094] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0095] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

Claims

1. A construction method for a radiation shielding wall, characterized in that, Includes the following steps: Precast blocks; Constructing a wall with a cavity, wherein the thickness of the wall is greater than 2m, and the width of the cavity is 3 / 4 to 4 / 5 of the thickness of the wall; The precast blocks are hoisted into the cavity, wherein the cavity contains a plurality of the precast blocks, and the plurality of the precast blocks are arranged in the cavity along the length and height of the wall to form a row of precast walls; the cavity contains at least two rows of the precast walls, and the precast blocks of the adjacent two rows of precast walls are placed in a staggered manner. A filling layer with a thickness of 150mm to 200mm is provided between the cavity wall and the precast block. The steps for constructing the wall with a cavity include: A template is set up within a pre-defined wall area. The wall area is planned in advance. The template is used to enclose the outer contour and internal cavity of the wall. Multiple cavities are provided and spaced apart along the length of the wall. A partition wall is set between two adjacent cavities. Reinforcing bars are erected in the template and concrete is poured; Remove the template to obtain the wall with the cavity; The step of filling the cavity wall and the precast block with a filling layer includes: The gap between the precast block and the wall is filled with C25 fine aggregate concrete and compacted by vibration to form the filling layer.

2. The construction method of the radiation shielding wall according to claim 1, characterized in that, The steps for making the precast blocks include: Precast blocks are made of concrete; Precast blocks are soaked in water for curing.

3. The construction method of the radiation shielding wall according to claim 1, characterized in that, The two adjacent rows of precast walls abut each other along the width of the wall.

4. The construction method of the radiation shielding wall according to claim 1, characterized in that, The wall has at least two cavities along its length, each cavity having a precast block and a filling layer. Adjacent cavities are separated by a partition wall, and the filling layer also fills the gap between the precast block and the partition wall.

5. The construction method of the radiation shielding wall according to claim 4, characterized in that, The wall has an inner wall and an outer wall separated by the cavity in the width direction, and the partition wall connects the inner wall and the outer wall.

6. The construction method of the radiation shielding wall according to claim 1, characterized in that, The precast blocks are equipped with lifting rings for hoisting.

7. The construction method of the radiation shielding wall according to claim 6, characterized in that, The precast block has a groove, and the lifting ring is disposed in the groove.

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