Neutron treatment plant shielding door capable of improving concrete sealing effect

Abstract

The invention discloses a neutron treatment plant shielding door capable of improving the sealing effect of concrete, which is characterized in that a piston type door frame is provided with supporting rib air holes, and the supporting rib air holes are used for exhausting gas in the concrete from the holes when the concrete is poured to two outer sides of the door frame. The door frame can be filled with the concrete; the piston type door body is provided with a piston type water cooling pipe, the piston type water cooling pipe penetrates from the first step to the Nth step in a step shape and is used for taking away 200-300 DEG C heat released in the concrete drying process, air holes generated due to too high heat in the concrete drying process are reduced, and the sealing effect of the concrete is improved. The outer layer and the inner layer of the shielding door are combined, shielding in the concrete pouring process and shielding in the drying process are combined, and the problems that concrete exhaust is not facilitated, and the concrete shielding effect of the door body is reduced due to the fact that a large amount of heat is released in the drying process of concrete are jointly solved.

Description

Technical Field

[0001] The present invention relates to the technical field of radiation shielding, and in particular to a neutron therapy plant shielding door capable of improving concrete sealing effect. Background Art

[0002] The walls and doors around the accelerator host shielding room must have good shielding capabilities for all types of radiation to ensure that the environment around the accelerator host system is safe.

[0003] The existing technology for shielding the walls and door bodies around the accelerator host shielding room is limited to solving the radiation sealing problem from the meshing shape of the door frame and the door body: Patent document CN215332506U discloses a heavy-mix piston shielding door, which solves the problem by setting a stepped structure on the upper and left and right sides of the door panel facing the door frame. When the shielding door is closed, the stepped structures engage with each other to form a labyrinth seal; Patent document 202411744511.4 discloses a piston shielding door. On the basis of the piston shielding door, an automatically adjustable shielding device is added at the threshold to compensate for the problem of radiation leakage at the bottom of the door body. At the same time, the automatically rising and falling shielding device also facilitates the entry and exit of personnel and equipment.

[0004] The above prior art all ignores the effect of concrete poured on the door frame and door body on radiation shielding. For such piston-type door frame and door body, concrete accounts for a large proportion.

[0005] First, concrete must be poured between the piston-style door frame and the wall to prevent radiation from escaping through the gaps at the edges. Because the door frame spans nearly 5 meters, reinforcing ribs must be placed around it. The ribs on the left and right outer sides of the door frame consist of long, stepped planes and right-angled surfaces. Concrete is poured from top to bottom and from bottom to top between these layers of ribs and the wall. Because the planes of the ribs are perpendicular to the direction of gravity, the concrete is blocked by the ribs during pouring, hindering the degassing of the concrete. When the gases in the concrete are not exhausted, numerous pores of varying sizes are formed, through which radiation can escape, compromising the door frame's radiation shielding effectiveness.

[0006] Secondly, since the door body is closed when the piston door body is completely embedded in the piston door frame, the door body is solid relative to the door frame, and the door frame is hollow. In order to prevent radiation from penetrating from the door body, concrete also needs to be poured inside the door body. In addition to the necessary facilities placed inside the door body, all gaps must be poured with concrete to prevent radiation leakage. In this way, the amount of concrete poured inside the door body is several times more than that of the door frame. When a large amount of concrete is piled up inside the door body, the heat released by the concrete during the drying process also increases exponentially. The heat released by the concrete inside the door body can reach 200-300 degrees, which will cause the interior of the concrete to expand and the surface to shrink, generating tensile stress. When the tensile stress exceeds the tensile strength of the concrete, temperature cracks will form. High temperature may also cause the moisture inside the concrete to evaporate prematurely, forming more capillaries and reducing the density.

[0007] These pores and cracks reduce the radiation shielding effect of the door. Summary of the Invention

[0008] In response to the problems existing in the prior art, the present invention proposes a neutron therapy plant shielding door that improves the concrete sealing effect. The first purpose is to solve the problem that the reinforcing ribs on the outside of the door frame are not conducive to the exhaust of concrete; the second purpose is to solve the problem that the concrete on the door body releases a large amount of heat during the drying process, and a large number of bubbles are generated inside the concrete when the temperature rises, thereby reducing the concrete shielding effect of the door body.

[0009] The present invention proposes the following technical solutions to solve the technical problems:

[0010] A shielding door for a neutron therapy plant that improves the sealing effect of concrete comprises: a piston-type door frame mounted on a wall, a piston-type door body cooperating with the piston-type door frame, a track for supporting the piston-type door body, and a driving device mounted inside the piston-type door body; the piston-type door frame is characterized in that: the piston-type door frame is a piston-type door frame with support rib air holes, the support rib air holes are used to discharge gas in the concrete from the holes when pouring concrete on the two outer sides of the door frame, so that the concrete can fill the door frame; the piston-type door body is a piston-type door body with a piston-type water-cooling pipe, the piston-type water-cooling pipe is in a stepped shape and passes through from the first step to the Nth step, and is used to take away the 200-300 degrees of heat released during the concrete drying process, reduce the air holes generated due to excessive heat during the concrete drying process, and reduce the temperature cracks formed when the tensile stress exceeds the tensile strength of the concrete, thereby improving the sealing effect of the concrete.

[0011] Furthermore, multiple layers of reinforcing ribs with supporting rib air holes are welded from top to bottom on the outer surfaces of both sides of the piston-type door frame with supporting rib air holes. The reinforcing ribs with supporting rib air holes on the current layer are composed of steel plates with supporting rib air holes on each step of the current layer.

[0012] Furthermore, the position of the steel plate with the supporting rib air hole (1-1) on each step of the current layer is different, and the position of the steel plate shrinks as the step of this layer shrinks: the smaller the width and height of the current step of the current layer are, the closer the opening position of the steel plate is to the center point position in the width direction of the door body; the larger the width and height of the current step of the current layer are, the farther the opening position of the steel plate is from the center point position in the width direction of the door body.

[0013] Furthermore, on the same step, the opening positions of the upper layer of steel plates with supporting rib air holes and the opening positions of the lower layer of steel plates with supporting rib air holes are not at the same position, but are staggered along the longitudinal direction of the door frame to evenly distribute the exhaust holes along the longitudinal direction of the door frame.

[0014] Furthermore, on the same step, the position of the openings on the upper layer of steel plates with support rib air holes and the number of openings on the lower layer of steel plates with support rib air holes are the same or different. The number of openings should take into account the strength of the reinforcement and the exhaust effect of the concrete, and find a balance between the two.

[0015] Furthermore, on the same step, the hole position of the upper layer of steel plate with support rib air holes and the hole diameter of the lower layer of steel plate with support rib air holes are the same or different. The diameter of the hole should take into account the strength of the reinforcement and the exhaust effect of the concrete, and find a balance between the two.

[0016] Furthermore, the piston-type door body with piston-type water-cooling pipes is provided with multiple rows of stepped water-cooling pipes along the width direction of the door body. The number of rows of stepped water-cooling pipes and the shape of each row must take into account the length of the water-cooling pipes in the door body to be as long as possible so as to contact more concrete in the door body to take away heat, while at the same time avoiding the reinforcing ribs and various facilities in the door body.

[0017] Furthermore, the length of the water-cooling pipes in the door body is as long as possible to contact more concrete in the door body to remove heat, while avoiding the reinforcing ribs and various facilities in the door body. Specifically, each row of stepped water-cooling pipes is connected by a curved pipe at the beginning and end from top to bottom and a plurality of forward and reverse U-shaped pipes of different heights in the middle.

[0018] Furthermore, the curved pipes at the beginning and end from top to bottom are connected with multiple forward and reverse U-shaped pipes of different heights in the middle, including: the upper step and the next step share a U-shaped pipe, and the intersection of the upper step and the next step shares a U-shaped pipe, and the first step or the last step has both a curved pipe and a U-shaped pipe.

[0019] Advantages and effects of the present invention

[0020] The present invention combines the outer shielding and inner shielding of the shielding door, and the shielding during the concrete pouring process and the shielding during the concrete drying process, thereby solving the problem that the concrete pouring process of the door frame is not conducive to concrete exhaust, and the problem that the concrete of the door body releases a large amount of heat during the drying process, thereby reducing the concrete shielding effect of the door body. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is the overall effect of the neutron therapy plant shielding door that improves the concrete sealing effect of the present invention;

[0022] Figure 2 This is the first perspective of the piston-type door frame with support ribs and air holes of the present invention;

[0023] Figure 3 This is the second perspective of the piston-type door frame with support ribs and air holes of the present invention;

[0024] Figure 4 This is the first perspective of the piston-type door body with a piston-type water-cooling tube of the present invention;

[0025] Figure 5 This is the second perspective of the piston-type door body with a piston-type water-cooling tube of the present invention;

[0026] Figure 6 This is a schematic diagram of the driving device arranged in the door body of the present invention;

[0027] Figure 7 A schematic diagram of a guide rail used in an embodiment of the present invention;

[0028] Figure 8 A schematic diagram of an adjustable rail clamp used in an embodiment of the present invention;

[0029] Figure 9 Schematic diagram of embedded steel bars used in an embodiment of the present invention.

[0030] In the figure, 1: piston-type door frame; 1-1: reinforcing rib; 1-2: reinforcing rib on top of door frame; 1-3: reinforcing rib inside door frame; 2: piston-type door body; 2-1: piston-type water-cooling pipe; 3: track; 4: driving device. DETAILED DESCRIPTION

[0031] Design principle of the present invention

[0032] The innovation and design principle of this invention lies in combining three layers and two processes of the shielding door to jointly solve the radiation shielding problem of the shielding door in the neutron therapy plant. The three layers of the shielding door are the outer layer, the middle layer, and the inner layer. First, the piston-type door frame and the piston-type door body are designed to address the radiation shielding problem at the interface between them, that is, the middle layer. Second, the exhaust holes in the piston door frame address the radiation shielding problem at the interface between the door frame and the wall, that is, the outer layer. Third, the stepped water cooling channel on the piston door body addresses the radiation shielding problem at the inner layer. The two processes are the concrete pouring process and the concrete drying process, with the pouring process addressing the exhaust problem and the drying process addressing the water cooling problem. This differs from the prior art in that the prior art only considers the shielding problem at the interface between the piston door frame and the piston door body, that is, the middle layer, and does not consider the radiation shielding problems of the outer layer, the inner layer, and the concrete pouring and drying processes.

[0033] Based on the above principles, the present invention designs a shielding door for neutron therapy workshops to improve the sealing effect of concrete. Figure 1-6 As shown, it includes: a piston-type door frame 1 installed on the wall, a piston-type door body 2 matched with the piston-type door frame, a track 3 for supporting the piston-type door body, and a driving device 4 installed inside the piston-type door body; its characteristics are: the piston-type door frame is a piston-type door frame with support rib air holes 1-1, and the support rib air holes 1-1 are used to discharge the gas in the concrete from the holes when pouring concrete on the two outer sides of the door frame, so that the concrete can fill the door frame; the piston-type door body 2 is a piston-type door body with a piston-type water-cooling pipe 2-1, as shown Figure 4-5 As shown, the piston-type water-cooling pipe 2-1 is in a stepped shape, extending from the first step to the Nth step, and is used to take away the 200-300 degrees of heat released during the concrete drying process, reduce the pores generated by excessive heat during the concrete drying process, and reduce the temperature cracks formed when the tensile stress exceeds the tensile strength of the concrete, thereby improving the sealing effect of the concrete.

[0034] like Figure 2-3 As shown, on the outer surfaces of both sides of the piston-type door frame with supporting rib air holes 1-1, multiple layers of reinforcing ribs with supporting rib air holes 1-1 are welded from top to bottom. The reinforcing ribs with supporting rib air holes 1-1 on the current layer are composed of steel plates with supporting rib air holes 1-1 on each step of the current layer.

[0035] Supplementary Note 1: Piston Door Design

[0036] ① The piston door has four layers, top, left, and right. A space is reserved at the bottom edge of the door (inside the door opening). Steps (shown in red in the figure) are installed at the corresponding locations on the shield wall (20 cm high, 625 cm thick; the exact dimensions are subject to further confirmation through radiation calculations). When the door is closed, they overlap the temporary steps. If the steps are larger, such as 300-400 cm, but the equipment is 3.5 meters wide, the minimum step's 300 cm is already constrained, so the minimum step cannot be less than 3.5 meters. If the entire frame is enlarged to meet the minimum step requirement, the larger the frame, the greater the deformation and the wavy appearance over long distances due to the increased number of welds. Therefore, the steps should be spaced 200 cm apart, top, bottom, left, and right.

[0037] ② Temporary steps: The specific design will be determined by the shield door manufacturer. They are not cast together with the shield wall and require a separate design. The steps are designed to be movable and can be removed when entering or exiting the equipment.

[0038] ③ Equipment shielding door opening size: The innermost width of the piston door is 3.5m, and the overall width of each layer increases by 0.4m toward the outside (i.e., 0.2m increases on each side). There are four layers in total, and the outermost layer is 4.7m wide; the innermost height of the piston door is 3.5m, and the overall width of each layer increases by 0.2m toward the outside. There are four layers in total, and the outermost layer is 4.1m high, forming a convex structure.

[0039] ④ Equipment shielding door dimensions: The shielding door is the same thickness as the wall. The innermost width and height of the piston door are ≤3.5m. Each outer layer increases in width by 0.4m (i.e., 0.2m on each side) and height by 0.2m. There are four layers, with the outermost layer ≤4.7m wide and ≤4.1m high, forming a convex structure. A 20cm high and 625cm thick excess is reserved below the front end of the door body to overlap the door opening. (For specific door gaps, refer to Article 7.)

[0040] ⑤ Equipment shielding door structure material composition: steel + concrete

[0041] Supplementary Note 2: Design of the drive device

[0042] ① Such as Figure 1 As shown, the power system 4 is arranged inside the door body. In this application, one motor drives four reducers. The output shaft of the reducer directly drives the power wheel, eliminating the gear transmission of the conventional reduction mechanism and improving the accuracy of the transmission system. The rear wheel is the power wheel and the front wheel is the driven wheel. The overall action is the forward and backward movement of the door body.

[0043] ② The power system of the present invention is all inside the door body, without an external motor hung on the door body, and the power system is arranged inside the door body, which is more beautiful.

[0044] Supplementary Note 3: Design of the guide rail

[0045] ① Use a motor and bottom guide rail for movement. The guide rail is buried underground, with the top of the rail flush with the ground. The guide rail design must take into account equipment access (ground levelness) and load-bearing requirements. The guide rail area must be flat to facilitate equipment access.

[0046] ② Solve the sinking and deformation problems of the guide rail. The entire weight of the door body is 120 tons, so the guide rail designed in this application can withstand 120 tons. Figure 9 As shown, a 40 mm thick steel plate is made under the guide rail, and pre-embedded steel bars are buried in the steel plate. The pre-embedded steel bars and the concrete steel bars are built together. As long as the ground does not sink, the entire pre-embedded steel bars will not sink.

[0047] ③Solve the parallel problem of the guide rail: such as Figure 7 、 Figure 8 The adjustable rail clamps are densely arranged along the guide rails and are used to adjust the parallelism of the two rails. Figure 8 As shown, there is an italic inside the adjustable rail clamp. Hitting the italic will increase the distance between the rails, and the rails can be moved in the corresponding direction to achieve a slight adjustment of the distance between the rails.

[0048] ③ The method for adjusting track parallelism using adjustable track clamps is: first adjust the first adjustable track clamp. There is another one opposite, equivalent to one on the left and one on the right of the track. The remaining adjustable track clamps only need to be applied with force. After adjusting one, all subsequent adjustable track clamps will be applied with force. Adjusting the first adjustable track clamp is the most reliable and quickest.

[0049] like Figure 2-3 As shown, the position of the steel plate with the supporting rib air hole 1-1 on each step of the current layer is different, and the position of the steel plate shrinks as the step of this layer shrinks: the smaller the width and height of the current step of the current layer are, the closer the opening position of the steel plate is to the center point of the door body in the width direction; the larger the width and height of the current step of the current layer are, the farther the opening position of the steel plate is from the center point of the door body in the width direction.

[0050] like Figure 2-3 As shown, on the same step, the opening position of the upper layer of steel plate with supporting rib air holes and the opening position of the lower layer of steel plate with supporting rib air holes are not at the same position, but are staggered along the longitudinal direction of the door frame to evenly distribute the exhaust holes along the longitudinal direction of the door frame.

[0051] like Figure 2-3As shown, on the same step, the position of the openings on the upper layer of steel plates with air holes for supporting reinforcements and the number of openings on the lower layer of steel plates with air holes for supporting reinforcements are the same or different. The number of openings should take into account the firmness of the reinforcements and the exhaust effect of the concrete, and find a balance between the two.

[0052] like Figure 2-3 As shown, on the same step, the opening position of the steel plate with the supporting rib air holes 1-1 on the upper layer and the opening diameter of the steel plate with the supporting rib air holes 1-1 on the lower layer are the same or different. The diameter of the opening should take into account the firmness of the reinforcement and the exhaust effect of the concrete, and find a balance between the two.

[0053] Supplementary Note 4: Design of the size and number of ventilation holes in the support ribs

[0054] The size and number of the support rib ventilation holes 1-1 are definitely better if the number and size are larger, but too large will also affect the strength of the reinforcement rib, so we make holes with a diameter of 40 and a length of 50. The positions of the holes on the upper and lower plates are staggered, and the holes on the upper and lower layers are staggered.

[0055] like Figure 4 As shown, the piston-type door body with piston-type water-cooling pipes is provided with multiple rows of stepped water-cooling pipes along the width direction of the door body. The number of rows of stepped water-cooling pipes and the shape of each row should take into account the length of the water-cooling pipes in the door body to be as long as possible so as to contact more concrete in the door body to take away heat, while at the same time avoiding the reinforcing ribs and various facilities in the door body.

[0056] Furthermore, the length of the water-cooling pipes in the door body is as long as possible to contact more concrete in the door body to remove heat, while avoiding the reinforcing ribs and various facilities in the door body. Specifically, each row of stepped water-cooling pipes is connected by a curved pipe at the beginning and end from top to bottom and a plurality of forward and reverse U-shaped pipes of different heights in the middle.

[0057] Furthermore, the curved pipes at the beginning and end from top to bottom are connected with multiple forward and reverse U-shaped pipes of different heights in the middle, including: the upper step and the next step share a U-shaped pipe, and the intersection of the upper step and the next step shares a U-shaped pipe, and the first step or the last step has both a curved pipe and a U-shaped pipe.

[0058] Supplementary Note 5: Design of water cooling pipe

[0059] ① Such as Figure 4-5 As shown, the simplest way to lay the water cooling pipe is to pass it straight from left to right, which is also the conventional method. However, this method has the worst heat dissipation effect because the water cooling pipe is the shortest. This application is designed to make the length of the water cooling pipe as long as possible.

[0060] ② Avoid the reinforcement ribs and various facilities inside the door body, including avoiding Figure 4 、 Figure 5 The driving device is provided near the lower end of the second and third steps. Since the driving device occupies the portion near the lower end of the first, second and third steps, the water cooling pipe starts from the fourth step and extends downward.

[0061] It should be emphasized that the above specific embodiments are merely explanations of the present invention and are not limitations of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the above embodiments as needed, but as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A neutron therapy plant shielding door for improving concrete sealing effect, comprising: The invention relates to a piston-type door frame (1) installed on a wall, a piston-type door body (2) matched with the piston-type door frame, a track (3) for supporting the piston-type door body, and a driving device (4) installed inside the piston-type door body; the characteristics are: the piston-type door frame is a piston-type door frame with supporting rib air holes (1-1), the supporting rib air holes (1-1) are used to discharge the gas in the concrete from the holes when pouring concrete on the two outer sides of the door frame, so that the concrete can fill the door frame; the piston-type door body (2) is a piston-type door body with a piston-type water-cooling pipe (2-1), the piston-type water-cooling pipe (2-1) is in a stepped shape and passes through from the first step to the Nth step, and is used to take away the heat of 200-300 degrees released during the concrete drying process, reduce the air holes generated due to excessive heat during the concrete drying process, and reduce the temperature cracks formed when the tensile stress exceeds the tensile strength of the concrete, thereby improving the sealing effect of the concrete.

2. The shielding door for neutron therapy workshop with improved concrete sealing effect according to claim 1, characterized in that: Multiple layers of reinforcing ribs (1-2) with supporting rib air holes (1-1) are welded from top to bottom on both side outer surfaces of the piston-type door frame with supporting rib air holes (1-1), and the reinforcing ribs (1-2) with supporting rib air holes (1-1) on the current layer are composed of steel plates with supporting rib air holes (1-1) on each step of the current layer.

3. The shielding door for neutron therapy workshop with improved concrete sealing effect according to claim 2, characterized in that: The position of the steel plate with the supporting rib air hole (1-1) on each step of the current layer is different, and the position of the steel plate shrinks as the step of the layer shrinks: the smaller the width and height of the current step of the current layer are, the closer the opening position of the steel plate is to the center point position in the width direction of the door body; the larger the width and height of the current step of the current layer are, the farther the opening position of the steel plate is from the center point position in the width direction of the door body.

4. The shielding door for neutron therapy workshop with improved concrete sealing effect according to claim 2, characterized in that: On the same step, the opening position of the upper layer of steel plate with supporting rib air holes (1-1) and the opening position of the lower layer of steel plate with supporting rib air holes (1-1) are not at the same position, but are staggered along the longitudinal direction of the door frame to evenly distribute the exhaust holes along the longitudinal direction of the door frame.

5. The shielding door for neutron therapy workshop with improved concrete sealing effect according to claim 2, characterized in that: On the same step, the position of the openings on the upper layer of steel plate with support rib air holes (1-1) and the number of openings on the lower layer of steel plate with support rib air holes (1-1) are the same or different. The number of openings should take into account the firmness of the reinforcement and the exhaust effect of the concrete, and find a balance between the two.

6. The shielding door for neutron therapy workshop with improved concrete sealing effect according to claim 2, characterized in that: On the same step, the opening position of the upper layer of steel plate with support rib air holes (1-1) and the opening diameter of the lower layer of steel plate with support rib air holes (1-1) are the same or different. The diameter of the opening should take into account the firmness of the reinforcement and the exhaust effect of the concrete, and find a balance between the two.

7. The shielding door for neutron therapy workshop with improved concrete sealing effect according to claim 1, characterized in that: The piston-type door body with piston-type water-cooling pipes is provided with multiple rows of stepped water-cooling pipes along the width direction of the door body. The number of rows of stepped water-cooling pipes and the shape of each row should take into account the length of the water-cooling pipes in the door body to be as long as possible so as to contact more concrete in the door body to take away heat, while at the same time avoiding the reinforcing ribs and various facilities in the door body.

8. The shielding door for neutron therapy workshop with improved concrete sealing effect according to claim 7, characterized in that: The water-cooling pipes in the door body are as long as possible to contact more concrete in the door body to remove heat, while avoiding the reinforcing ribs and various facilities in the door body. Specifically, each row of stepped water-cooling pipes is connected by curved pipes at the beginning and end from top to bottom and multiple forward and reverse U-shaped pipes of different heights in the middle.

9. The shielding door for neutron therapy workshop with improved concrete sealing effect according to claim 8, characterized in that: The method comprises connecting the curved pipes at the beginning and the end from top to bottom with a plurality of forward and reverse U-shaped pipes of different heights in the middle, including: the upper step and the lower step share a U-shaped pipe, the junction of the upper step and the lower step shares a U-shaped pipe, and the first step or the last step has both a curved pipe and a U-shaped pipe.

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