An ultra-thick anti-radiation wall joint construction structure free of chiseling

Abstract

This invention provides a method for constructing ultra-thick radiation-proof walls with tongue-and-groove joints without roughening, relating to the field of radiation-proof building construction technology. It applies to both horizontal and vertical construction joints in walls and includes the following steps: S1. Based on the construction design, determine the construction joint at the target location on the wall and complete the installation and fixing of the water-stop steel plate at that location; S2. At the tongue-and-groove section of the construction joint, support a steel plate with densely protruding surfaces as a forming template; S3. Apply a retarder to the working surface of the forming template; S4. Pour, vibrate, and subsequently cure the concrete; S5. After the concrete reaches the demolding strength, remove the forming template and wash the exposed concrete tongue-and-groove surface that has not fully set due to the retarder effect. The beneficial effects of this invention are: it can effectively solve the current problems of difficulty in roughening the wall surface and the inability to guarantee the quality of roughening in walls with large thickness, dense reinforcement, and tongue-and-groove joints located in the center of the wall.

Description

Technical Field

[0001] This invention relates to the field of radiation protection building construction technology, and in particular to a method for constructing ultra-thick radiation protection walls with tongue-and-groove joints without roughening the surface. Background Technology

[0002] Proton and heavy ion therapy is currently one of the most effective cancer treatments, belonging to radiotherapy and recognized internationally as a cutting-edge technology. Protons and heavy ions both belong to particle beams, but unlike traditional photon beams, particle beams can form energy Bragg peaks, enabling concentrated destruction of tumors while minimizing damage to healthy tissues. Xuzhou Proton and Heavy Ion Hospital is the first hospital in the Huaihai Economic Zone to include proton and heavy ion therapy. The proton and heavy ion therapy area includes one synchrotron accelerator room, one cyclotron accelerator, one linear accelerator, one proton therapy chamber, and three heavy ion therapy chambers. Because proton and heavy ion therapy releases high-energy radiation during treatment, the system requires high levels of radiation shielding, resulting in a massive reinforced concrete structure for the hospital.

[0003] Taking the Xuzhou Proton and Heavy Ion Hospital as an example, the highest point of the walls reaches 8 meters. The shielding walls of the treatment rooms and accelerator rooms are ultra-thick, with a thickness of 1-3 meters, reaching a maximum of 5.3 meters at the corners. The walls in the attached linear accelerator area and cyclotron accelerator area are also 1-3 meters thick. The complex shape and dense reinforcement of the project's walls brought significant challenges to construction. To ensure the quality of concrete pouring and reduce the free fall height, pouring was carried out in layers with horizontal construction joints. Because the pouring length has a significant impact on concrete cracking, the shear walls were constructed using a segmented pouring and integral forming skip-pour method. However, to achieve the radiation protection effect of the structure, radiation-shielding concrete cannot have through-construction joints. Traditional skip-pour construction methods, due to the presence of construction joints, do not meet the site requirements.

[0004] Therefore, new methods need to be developed for the construction of ultra-thick radiation-proof walls to ensure the radiation-proof effect of the structure.

[0005] How to solve the above-mentioned technical problems is the challenge facing this invention. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a method for constructing ultra-thick radiation-proof walls without the need for roughening the construction joint structure of the tongue and groove joint. This method effectively solves the problems of difficulty in roughening the concrete of the tongue and groove joint after demolding, especially for walls with large wall thickness, dense reinforcement, and tongue and groove joints located in the center of the wall, and the inability to guarantee the quality of roughening.

[0007] The technical solution adopted by this invention to solve its technical problem is as follows: This invention provides a method for constructing an ultra-thick radiation-shielding wall with a tongue-and-groove joint structure without roughening. This method, applied to both horizontal and vertical construction joints of the wall, includes the following steps: S1. Based on the construction design, determine the construction joint at the target location on the wall and complete the installation and fixing of the water-stop steel plate at that location; S2. At the tongue and groove joint of the construction joint, a steel plate with densely protruding surfaces is installed as a forming template. S3. Apply a retarder to the working surface of the forming template; S4. Concrete pouring, vibration and subsequent curing; S5. After the concrete reaches the demolding strength, remove the molding template and wash the exposed concrete tongue and groove surface that has not fully set due to the action of the retarder to form a roughened joint surface.

[0008] The wall is a radiation-proof concrete wall, and its construction was carried out using the skip-construction method.

[0009] In step S2, the forming template uses square steel tubes as back ribs and is reinforced by adjustable U-shaped clamps.

[0010] When the construction joint is a vertical construction joint in the wall, between steps S1 and S2, the following step is also included: installing a quick-closing mesh on the outside of the waterstop steel plate. In step S2, when reinforcing the vertical construction joint of the wall with the molded template, the adjustable U-shaped clamps are installed at a vertical spacing of 200mm to 300mm. When the construction joint is a horizontal construction joint in the wall, in step S2, the forming template is supported by a hanging formwork method.

[0011] In step S2, when reinforcing the horizontal construction joint of the wall with the molded template, the adjustable U-shaped clamps are installed at a spacing of 400mm to 500mm in the horizontal direction.

[0012] In step S2, the width of the steel plate with dense protrusions is consistent with the designed protrusion width of the construction joint tongue and groove.

[0013] In step S5, the rinsing is performed by spraying water with a high-pressure water gun.

[0014] It is applied to radiation-proof concrete walls with a thickness of 1 to 3 meters.

[0015] Specifically, the method for constructing vertical structural joints in ultra-thick radiation-proof walls without roughening the surface, based on the tongue-and-groove joints, includes the following steps: S1. Based on the on-site construction conditions, the vertical construction joints of the wall are divided according to the concrete crack resistance calculation. The wall reinforcement is tied according to the division of the construction joints. The reinforcement of the wall to be poured is tied first. The horizontal reinforcement of the adjacent area of ​​the construction joint is laid first, and no tying work is done. S2. The protective layer spacers are tied together, and the protective spacers are fixed to the steel bars in a quincunx pattern with a spacing of no more than 1000mm. S3. The installation and welding of water-stop steel plates at vertical construction joints in the wall increases the water seepage path and can effectively isolate groundwater, preventing it from seeping into the basement and causing the basement to become too damp. S4. Due to the large wall thickness and dense wall reinforcement, the formwork for the vertical construction joint tongue and groove joint uses steel plates with densely raised surfaces. The width of the steel plates is consistent with the size of the protrusion of the construction joint, and square steel pipes are used as the keel. S5. Install quick-closing steel mesh at vertical construction joints in the wall; S6. Apply an appropriate amount of retarder to the template surface, level and straighten the formwork steel plate, and reinforce it with adjustable U-shaped clamps. The spacing of the adjustable U-shaped clamps at the vertical construction joints of the wall is 200-300mm. S7. Concrete pouring and compaction; S8. Dismantle the formwork system in a timely manner. After demolding, use a high-pressure water gun to wash away the uncured cement mortar.

[0016] A method for constructing horizontal structural joints in ultra-thick radiation-proof walls without roughening the surface, based on tongue-and-groove joints, includes the following steps: S1. Based on the on-site construction conditions, the horizontal construction joints of the wall are divided according to the concrete crack resistance calculation. The wall reinforcement is tied according to the division of the construction joints. The reinforcement of the wall to be poured is tied first. The vertical reinforcement of the adjacent area of ​​the construction joint is laid first, and no tying work is done. S2. The protective layer spacers are tied together, and the protective spacers are fixed to the steel bars in a quincunx pattern with a spacing of no more than 1000mm. S3. The installation and welding of water-stop steel plates at horizontal construction joints in the wall increases the water seepage path and can effectively isolate groundwater, preventing it from seeping into the basement and causing the basement to become too damp. S4. Due to the large wall thickness and dense wall reinforcement, the horizontal construction joint tongue and groove formwork support uses steel plates with densely raised surfaces. The width of the steel plates is consistent with the size of the protrusion of the construction joint, and square steel pipes are used as the keel. S5. Apply an appropriate amount of retarder to the template surface, level and straighten the formwork steel plate, and reinforce it with adjustable U-shaped clamps. The spacing of the adjustable U-shaped clamps at the horizontal construction joint of the wall is 400-500mm. S6. Concrete pouring and compaction; S7. Promptly dismantle the formwork system. After demolding, use a high-pressure water gun to wash away any uncured cement mortar.

[0017] Water curing should be carried out for no less than 14 days to avoid cracks in the concrete wall due to inadequate curing, which would affect the radiation protection effect. The surface of the horizontal construction joint of the wall should be roughened to avoid through cracks caused by the current segmented or skip-pour pouring method. At the same time, it can reduce the amount of roughening work and ensure the roughening effect, so that the concrete pouring construction joint can be better integrated, thereby effectively ensuring the radiation protection effect of the ultra-thick wall.

[0018] The adjustable U-shaped clamp includes an L-shaped fixed arm, and an adjustable arm is slidably connected to the long section of the fixed arm. The adjustable arm includes an annular part that is slidably fitted to the fixed arm. Several positioning holes are evenly distributed on the long section of the fixed arm and the annular part of the adjustable arm, and pins are inserted into the positioning holes.

[0019] The beneficial effects of this invention are as follows: The concave-convex construction joint of the radiation shielding wall, by using a steel plate with dense protrusions, can form a concave-convex shape on the concrete surface after demolding, eliminating the need for roughening. This effectively solves the current problem that it is difficult to carry out roughening work on the tongue-and-groove concrete after demolding for walls with large thickness, dense steel reinforcement, and tongue and groove joints located in the center of the wall, and the roughening quality cannot be guaranteed. Attached Figure Description

[0020] Figure 1 This is a diagram showing the layout of construction joints in the vertical structure of this invention; Figure 2 This is a cross-sectional view of the layered tongue-and-groove joint of the shear wall according to the present invention; Figure 3 This is a schematic diagram of the vertical construction joint of the present invention; Figure 4 This is a schematic diagram of the horizontal construction joint of the present invention; Figure 5 This is a real photo of the completed wall reinforcement binding in the project of this invention; Figure 6 This is a cross-sectional view of the horizontal construction joint reinforcement of the wall in the present invention. Figure 7 This is a cross-sectional view of the vertical construction joint reinforcement of the wall in the present invention. Figure 8 This is a schematic diagram of the wall reinforcement template of the present invention; Figure 9 This is a schematic diagram of the adjustable U-shaped clamp of the present invention.

[0021] The attached diagram is labeled as follows: 1. Pad; 2. Steel plate; 3. Square steel pipe; 4. Adjustable U-shaped clamp; 401. Fixed arm; 402. Adjustable arm; 403. Positioning hole; 404. Pin; 5. Quick-closing mesh; 6. Water-stop steel plate. Detailed Implementation

[0022] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0023] See Figures 1 to 9 As shown, this embodiment is a method for constructing an ultra-thick radiation shielding wall with tongue-and-groove joints without roughening the surface.

[0024] A method for constructing vertical structural joints in ultra-thick radiation-proof walls without roughening the surface is based on the tongue-and-groove joints, including the following steps: S1. Based on the on-site construction conditions, the vertical construction joints of the wall are divided according to the concrete crack resistance calculation. The wall reinforcement is tied according to the division of the construction joints. The reinforcement of the wall to be poured is tied first. The horizontal reinforcement of the adjacent area of ​​the construction joint is laid first, and no tying work is done. S2. The protective layer pads 1 are tied together and fixed to the steel bars in a quincunx pattern with a spacing of no more than 1000mm. S3. The installation and welding of the water-stop steel plate at the vertical construction joint of the wall increases the water seepage path and can effectively isolate groundwater to prevent it from seeping into the basement and causing the basement to be too damp. S4. Due to the large wall thickness and dense wall reinforcement, the vertical construction joint tongue and groove formwork is supported by steel plate 2 with densely raised surface. The width of steel plate 2 is consistent with the 400mm protrusion of the construction joint. Two square steel pipes 3 serve as keel. S5. Install quick-closing steel mesh at vertical construction joints in the wall; S6. Apply an appropriate amount of retarder to the template surface, level and straighten the formwork steel plate, and reinforce it with adjustable U-shaped clamps 4. The spacing of the adjustable U-shaped clamps 4 at the vertical construction joints of the wall is 300mm. S7. Concrete pouring and compaction; S8. Dismantle the formwork system in a timely manner. After demolding, use a high-pressure water gun to wash away the uncured cement mortar.

[0025] A method for constructing horizontal structural joints in ultra-thick radiation-proof walls without roughening the surface, based on tongue-and-groove joints, includes the following steps: S1. Based on the on-site construction conditions, the horizontal construction joints of the wall are divided according to the concrete crack resistance calculation. The wall reinforcement is tied according to the division of the construction joints. The reinforcement of the wall to be poured is tied first. The vertical reinforcement of the adjacent area of ​​the construction joint is laid first, and no tying work is done. S2. The protective layer pads 1 are tied together and fixed to the steel bars in a quincunx pattern with a spacing of no more than 1000mm. S3. The installation and welding of the water-stop steel plate at the horizontal construction joint of the wall increases the water seepage path and can effectively isolate groundwater to prevent it from seeping into the basement and causing the basement to be too damp. S4. Due to the large wall thickness and dense wall reinforcement, the horizontal construction joint tongue and groove formwork support uses a steel plate 2 with densely raised surface. The width of the steel plate 2 is consistent with the 400mm protrusion of the construction joint. Two square steel pipes 3 serve as the keel. S5. Apply an appropriate amount of retarder to the template surface, level and straighten the formwork steel plate, and reinforce it with adjustable U-shaped clamps 4. The spacing of the adjustable U-shaped clamps 4 at the horizontal construction joint of the wall is 500mm. S6. Concrete pouring and compaction; S7. Promptly dismantle the formwork system. After demolding, use a high-pressure water gun to wash away any uncured cement mortar.

[0026] Water curing should be carried out for no less than 14 days to avoid cracks in the concrete wall due to inadequate curing, which would affect the radiation protection effect. The surface of the horizontal construction joint of the wall should be roughened to avoid through cracks caused by the current segmented or skip-pour pouring method. At the same time, it can reduce the amount of roughening work and ensure the roughening effect, so that the concrete pouring construction joint can be better integrated, thereby effectively ensuring the radiation protection effect of the ultra-thick wall.

[0027] The adjustable U-shaped clamp 4 includes an L-shaped fixed arm 401, and an adjustable arm 402 is slidably connected to the long section of the fixed arm 401. The adjustable arm 402 includes an annular part that is slidably fitted to the fixed arm 401. A plurality of positioning holes 403 are evenly distributed on the long section of the fixed arm 401 and the annular part of the adjustable arm 402, and pins 404 are inserted into the positioning holes 403.

[0028] The technical features of this invention not described can be implemented by or using existing technology, and will not be repeated here. Of course, the above description is not a limitation of this invention, and this invention is not limited to the examples above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this invention should also be within the protection scope of this invention.

Claims

1. A method for constructing an ultra-thick radiation-proof wall with tongue-and-groove joints without roughening the surface, characterized in that... The application of horizontal and vertical construction joints in walls includes the following steps: S1. Based on the construction design, determine the construction joint at the target location on the wall and complete the installation and fixing of the water-stop steel plate (6) at that location; S2. At the tongue and groove joint of the construction joint, a steel plate (2) with dense protrusions on the surface is supported as a forming template. S3. Apply a retarder to the working surface of the forming template; S4. Concrete pouring, vibration and subsequent curing; S5. After the concrete reaches the demolding strength, remove the molding template and wash the exposed concrete tongue and groove surface that has not fully set due to the action of the retarder to form a roughened joint surface.

2. The method for constructing ultra-thick radiation-proof wall tongue-and-groove joints without roughening as described in claim 1, characterized in that, The wall is a radiation-proof concrete wall, and its construction was carried out using the skip-construction method.

3. The method for constructing ultra-thick radiation-proof wall tongue-and-groove joints without roughening as described in claim 1, characterized in that, In step S2, the forming template uses square steel pipe (3) as back rib and is reinforced by adjustable U-shaped clamp (4).

4. The method for constructing ultra-thick radiation-proof wall tongue-and-groove joints without roughening as described in claim 1, characterized in that, When the construction joint is a vertical construction joint of the wall, between steps S1 and S2, the following step is also included: installing a quick-closing mesh (5) on the outside of the waterstop steel plate (6).

5. The method for constructing ultra-thick radiation-proof wall tongue-and-groove joints without roughening as described in claim 4, characterized in that, In step S2, when reinforcing the vertical construction joint of the wall with the molded template, the adjustable U-shaped clamp (4) is installed at a vertical spacing of 200mm to 300mm.

6. The method for constructing ultra-thick radiation-proof wall tongue-and-groove joints without roughening as described in claim 1, characterized in that, When the construction joint is a horizontal construction joint in the wall, in step S2, the forming template is supported by a hanging formwork method.

7. The method for constructing ultra-thick radiation-proof wall tongue-and-groove joints without roughening as described in claim 6, characterized in that, In step S2, when reinforcing the horizontal construction joint of the wall with the molded template, the adjustable U-shaped clamp (4) is installed at a spacing of 400mm to 500mm along the horizontal direction.

8. The method for constructing ultra-thick radiation-proof wall tongue-and-groove joints without roughening as described in claim 1, characterized in that, In step S2, the width of the steel plate (2) with dense protrusions is consistent with the designed protrusion width of the construction joint tongue and groove.

9. The method for constructing ultra-thick radiation-proof wall tongue-and-groove joints without roughening as described in claim 1, characterized in that, In step S5, the rinsing is performed by spraying water with a high-pressure water gun.

10. The method for constructing ultra-thick radiation-proof wall tongue-and-groove joints without roughening as described in claim 1, characterized in that, It is applied to radiation-proof concrete walls with a thickness of 1 to 3 meters.

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