Contest swimming pool external corner reinforcing structure and construction method

Abstract

The invention discloses a competition swimming pool external corner reinforcing structure and a construction method, belongs to the technical field of swimming pool construction, and aims at solving the technical problems that a traditional swimming pool external corner is prone to cracking and water seepage, the reinforcing structure is single, and real-time monitoring is lacked. The construction method comprises the following steps: prefabricating the L-shaped composite reinforcing unit containing the modified EVA buffer layer, the galvanized steel plate, the elastic epoxy bonding layer, the reinforced cement plate and the pre-embedded fiber grating sensor; the swimming pool concrete inner wall of the pre-embedded external corner cold-rolled ribbed reinforcing mesh is poured; a polymer cement mortar leveling layer with external corners pressed into fillets and a polyurethane waterproof coating and SBS coiled material double-layer waterproof layer are constructed; the L-shaped composite reinforcing unit is embedded through laser positioning, a seam is sealed, and a sensor is debugged; and the waterproof mortar layer and the anti-skid ceramic tile surface layer are constructed. The anti-seepage, anti-impact and anti-fatigue capacities are improved through a multi-layer cooperative reinforcing system, active protection is achieved in combination with real-time stress monitoring, the service life of the external corner of the competition swimming pool is effectively prolonged, and the method is suitable for construction of professional competition swimming pools.

Description

Technical Field

[0001] This invention relates to the field of swimming pool construction technology, and in particular to a reinforced corner structure and construction method for a competition swimming pool. Background Technology

[0002] As an important component of modern architecture, the design and construction of competition swimming pools are not only about aesthetics, but also about structural safety and durability. In the construction of a swimming pool, the external corners, as crucial connecting points, directly affect the stability of the entire structure.

[0003] Traditional swimming pool corner structures often use right-angle connections. This type of structure is prone to cracking and seepage when subjected to water pressure and long-term erosion by pool water. Furthermore, the reinforcement structure is simple, relying only on reinforced steel or a single layer of composite materials, without a multi-layered collaborative system. This results in insufficient impact and fatigue resistance, making it difficult to withstand the instantaneous impact and temperature cycle stress of athletes starting and turning during competition. In addition, traditional swimming pool corner structures lack real-time structural monitoring capabilities, making it impossible to capture changes in internal stress. Repairs can only be carried out passively after leakage occurs, leading to irreversible corrosion of the concrete base layer. Summary of the Invention

[0004] To overcome the above shortcomings, this invention provides a reinforced structure and construction method for the external corner of a competition swimming pool, aiming to improve the problems of traditional swimming pool external corners being prone to cracking and water leakage, lacking a multi-layer collaborative system, having insufficient impact and fatigue resistance, and lacking real-time structural monitoring capabilities.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a corner reinforcement structure for a competition swimming pool, comprising a concrete inner wall of the pool, wherein the outer layer of the concrete inner wall is sequentially provided with a polymer cement mortar leveling layer, a polyurethane waterproof coating layer, an SBS waterproof membrane layer, a crack-resistant cement mortar protective layer, an L-shaped composite reinforcement unit, a waterproof mortar layer, and an anti-slip ceramic tile surface layer; the corner of the concrete inner wall of the pool is fixed with a cold-rolled ribbed steel mesh, and C35P8 grade impermeable concrete is used; the corner of the polymer cement mortar leveling layer is rounded, and the SBS waterproof membrane layer is reinforced at the corner. The reinforcement layer consists of an L-shaped composite reinforcement unit embedded in a crack-resistant cement mortar protective layer, flush with the surface of the protective layer. From the inside out, the unit comprises a modified EVA buffer layer, a galvanized steel plate, an elastic epoxy adhesive layer, and a reinforced cement board. A fiber optic stress sensor is pre-embedded between the modified EVA buffer layer and the galvanized steel plate. Water-swellable sealing strips are embedded and sealed at the joints of adjacent L-shaped composite reinforcement units. The fiber optic stress sensor is connected to a data monitoring box outside the pool via a PVC protective pipe. The waterproof mortar layer is a penetrating crystalline waterproof mortar. The anti-slip ceramic tile surface layer is laid with tile adhesive, and the tile joints are filled with waterproof grout.

[0006] Preferably, the galvanized steel sheet is coated with a 5-8 μm thick nano-Al2O3 ceramic coating; 10%-15% nitrile rubber particles are added to the elastic epoxy adhesive layer; the modified EVA buffer layer has a thickness of 3-5 mm; the galvanized steel sheet has a thickness of 2-3 mm; the elastic epoxy adhesive layer has a thickness of 2-3 mm; and the reinforced cement board has a thickness of 8-10 mm.

[0007] Preferably, the mesh spacing of the cold-rolled ribbed steel mesh is 150mm×150mm, and the distance between the weld points of the cold-rolled ribbed steel mesh and the main steel bars of the inner wall of the swimming pool concrete is no more than 300mm.

[0008] Preferably, the inner wall of the pool concrete is cured by membrane covering and spraying for a curing time of not less than fourteen days; the mix ratio of the polymer cement mortar leveling layer is cement: medium sand: polypropylene fiber: redispersible latex powder = 1:2:0.0009:0.03, and the consistency is 50-70mm.

[0009] Preferably, the radius of the external corner of the polymer cement mortar leveling layer is 50mm; the polyurethane waterproof coating layer is applied in two coats with a total thickness of 1.5mm, and the first and second coats are applied in perpendicular directions.

[0010] Preferably, the SBS waterproof membrane has a thickness of 3mm, is constructed using the hot-melt method, and has an overlap width of not less than 100mm; the width of the external corner reinforcement layer of the SBS waterproof membrane is 500mm.

[0011] Preferably, the mix ratio of the crack-resistant cement mortar protective layer is cement: medium sand: polypropylene fiber = 1:2:0.0006, and the thickness is 20mm; the diameter of the water-swellable waterstop strip is 8mm, and the expansion ratio is not less than 300%.

[0012] Preferably, the sealant and elastic epoxy adhesive used for the joints of adjacent L-shaped composite reinforcing units are the same type; the sampling frequency of the data monitoring box is 1Hz.

[0013] Preferably, the waterproof mortar layer has a mix ratio of cement: medium sand: penetrating crystallizing masterbatch = 1:2:0.02, a consistency of 60-80mm, and a bonding strength with the L-shaped composite reinforcing unit of not less than 0.8MPa; the anti-slip ceramic tile surface layer has a size of 600mm×600mm, a hollow rate of not more than 5%, and a tile joint width of 3mm.

[0014] A construction method for reinforcing the external corner of a competition swimming pool includes the following steps:

[0015] S1: Prefabricated L-shaped composite reinforcement unit, processed reinforced cement board with 45° bevel, treated galvanized steel plate and then composited with reinforced cement board through elastic epoxy adhesive layer, pasted modified EVA buffer layer and pre-embedded fiber optic stress sensor.

[0016] S2: Tie the steel bars of the inner wall of the pool concrete and the cold-rolled ribbed steel mesh at the external corner, pour C35P8 impermeable concrete and cure for no less than fourteen days.

[0017] S3: Apply a polymer cement mortar leveling layer and press the external corners into 50mm radius rounded corners. After applying a polyurethane waterproof coating layer, lay an SBS roll waterproof layer and an external corner reinforcement layer.

[0018] S4: Pour a crack-resistant cement mortar protective layer, laser positioning embeds the L-shaped composite reinforcement unit, seal the splice seam and connect and debug the fiber optic stress sensor and data monitoring box;

[0019] S5: Pour a penetrating crystalline waterproof mortar layer and cure it for no less than fourteen days; lay an anti-slip ceramic tile surface layer and fill it with waterproof grout and cure it for more than seven days.

[0020] The present invention has the following beneficial effects:

[0021] 1. This invention rounds the external corners of the leveling layer to eliminate stress concentration. Combined with a double-layer waterproof structure and a specialized corner reinforcement layer, the optimized form and multi-layer protection work synergistically to significantly reduce the risk of water seepage. The protective effect is far superior to a single rounded corner treatment or single-layer waterproofing. Furthermore, with an L-shaped four-layer composite reinforcement unit as the core, each layer performs functions such as energy absorption, impact resistance, prevention of interlayer peeling, and surface support. Combined with a special reinforcing steel mesh for the base corner, a dual reinforcement system of base layer and composite layer is formed, significantly improving resistance to instantaneous impact and effectively extending fatigue life. The effect is superior to traditional single-layer steel reinforcement or single-layer composite material laying. In addition, stress sensors are pre-embedded inside the composite reinforcement unit, linked with an external data monitoring box to capture stress changes in real time. This allows for early warning of potential cracks, preventing irreversible corrosion of the concrete base layer by chlorinated pool water and solving the drawbacks of traditional passive maintenance.

[0022] 2. In this invention, the L-shaped composite reinforcing unit adopts a factory prefabrication mode and is installed with laser positioning. Compared with on-site manual pouring, this not only improves construction efficiency but also effectively avoids human error and ensures installation accuracy. The galvanized steel plate is sprayed with a nano-Al2O3 ceramic coating, and nitrile rubber particles are added to the elastic epoxy adhesive layer. Through targeted optimization of key materials, good compatibility between the materials of each layer is ensured, allowing for long-term stable collaborative work. The splicing joints of adjacent composite units are sealed with water-swellable sealing strips in conjunction with the same type of elastic epoxy, effectively reducing the risk of water seepage at the joints. Attached Figure Description

[0023] Figure 1 This invention provides a construction flowchart for a reinforced corner structure of a competitive swimming pool.

[0024] Figure 2 This is a cross-sectional view of a corner reinforcement structure for a competitive swimming pool proposed in this invention;

[0025] Figure 3 This is a cross-sectional view of an L-shaped composite reinforcing unit for reinforcing the external corner of a competitive swimming pool, as proposed in this invention.

[0026] Figure 4 This is a connection diagram of an L-shaped composite reinforcing unit for a corner reinforcement structure in a competitive swimming pool, as proposed in this invention.

[0027] Figure 5 This is a diagram showing the connection of the anti-slip ceramic tile surface layer in a competitive swimming pool corner reinforcement structure proposed in this invention.

[0028] Legend:

[0029] 1. Concrete inner wall of swimming pool; 2. Polymer cement mortar leveling layer; 3. Polyurethane waterproof coating layer; 4. SBS roll waterproof layer; 5. L-shaped composite reinforcement unit; 5-1. Modified EVA buffer layer; 5-2. Galvanized steel plate; 5-3. Elastic epoxy bonding layer; 5-4. Reinforced cement board; 6. Waterproof mortar layer; 7. Anti-slip ceramic tile surface layer; 8. Waterproof sealant; 9. Water-swellable waterstop strip; 10. Fiber optic grating stress sensor; 11. PVC protective pipe; 12. Data monitoring box; 13. Cold-rolled ribbed steel mesh. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Reference Figures 1-5 One embodiment provided by the present invention:

[0032] Before implementation, materials and equipment preparation must be completed, and materials for each stage must be prepared according to design requirements: Basalt fiber reinforced cement board 5-4 is selected, with a fiber content of 18% and a flexural strength of 13MPa; galvanized steel sheet 5-2 is selected, made of Q235 material, with a thickness of 2.5mm and a zinc coating thickness of 85μm, and is equipped with nano-Al2O3 ceramic powder; the elastic epoxy adhesive layer 5-3 uses a two-component epoxy adhesive, with a main agent to curing agent ratio of 3:1, and includes 12% nitrile rubber particles with a particle size of 5 mm. 00 mesh; Modified EVA buffer layer 5-1 is a butyl rubber modified version with a Shore hardness of 55HA and a compression set of 18%; Fiber optic stress sensor 10 has a range of 0~1000με, an accuracy of ±1με, and an operating temperature range of -30℃~80℃; Other materials such as P.O42.5 cement, medium sand, polypropylene fiber, redispersible latex powder, polyurethane waterproof coating layer 3, SBS roll waterproof layer 4, water-swellable waterstop strip 9, C2TES grade 1 tile adhesive, etc., all comply with relevant national standards. It is equipped with CNC panel cutting machines, electrostatic spraying machines, epoxy coating machines, laser positioning instruments, immersion vibrators, rubber hammers, hot melt coil welding machines, and data acquisition instruments. The CNC panel cutting machine has an accuracy control of ±0.5mm, the electrostatic spraying machine has a pressure of 0.8MPa, the epoxy coating machine has a coating thickness error of ±0.1mm, the laser positioning instrument has an accuracy of ±1mm, the immersion vibrator has a vibration frequency of 50Hz, the rubber hammer has an impact force of no more than 50N, the hot melt coil welding machine has a temperature control range of 180~220℃, and the data acquisition instrument has a sampling frequency of 1Hz. The laser positioning instrument is calibrated in advance, and the fiber optic stress sensor 10 signal is debugged to ensure that the equipment is in normal working order.

[0033] When prefabricating the L-shaped composite reinforcing unit 5, firstly, a CNC cutting machine is used to cut the reinforced cement board 5-4 into an L-shape. The length of the right-angle side of the L-shape is set to 400mm and the thickness to 9mm. Then, a special chamfering machine is used to process 45° bevels on both sides of the board, with a chamfer width of 6mm. A penetrating crystalline waterproofing agent is applied to the beveled surface at a dosage of 0.3kg / m². After application, it is allowed to dry at room temperature for 4 hours before use. Next, the galvanized steel plate 5-2 is cut into an L-shape to match the reinforced cement board 5-4. The galvanized steel plate 5-2 is then sandblasted. 2. Degreasing and rust removal are performed to achieve a rust removal grade of Sa2.5. Then, a nano-Al2O3 ceramic coating is sprayed onto the surface of the galvanized steel sheet 5-2 using an electrostatic spraying machine. The spraying temperature is controlled at 180℃, and the coating thickness is 6μm. After spraying, the galvanized steel sheet 5-2 is placed in an oven and cured at 180℃ for 2 hours. Subsequently, an elastic epoxy adhesive layer 5-3 is evenly applied to one side of the ceramic-coated galvanized steel sheet 5-2 using an epoxy adhesive applicator. The adhesive layer thickness is 2.5mm. The dried reinforced cement board 5- is then then applied. 4. Align and adhere the elastic epoxy adhesive layer 5-3 to the surface, place it in a pressure device to apply a pressure of 0.5 MPa, and cure at room temperature for 24 hours to ensure that the peel strength of the elastic epoxy adhesive layer 5-3 is not less than 1.5 MPa; then apply hot melt adhesive to the side of the galvanized steel plate 5-2 away from the reinforced cement board 5-4, with the hot melt adhesive temperature controlled at 130℃. After application, attach the modified EVA buffer layer 5-1, with a buffer layer thickness of 4 mm. At the same time, along the right-angle side of the L-shaped composite reinforcing unit 5, apply the modified EVA buffer layer 5-1 every 200 mm. A fiber optic stress sensor 10 is pre-embedded between the buffer layer 5-1 and the galvanized steel plate 5-2. The lead wire of the fiber optic stress sensor 10 is inserted into a PVC protective pipe 11. The diameter of the PVC protective pipe 11 is 6mm and the length of the pipe extends 100mm beyond the edge of the L-shaped composite reinforcing unit 5. Finally, the dimensions of the L-shaped composite reinforcing unit 5 are checked to ensure that the dimensional deviation does not exceed ±1mm. The bonding of each layer is checked to ensure that there are no voids. The signal of the fiber optic stress sensor 10 is checked to ensure that the transmission is stable. After passing the inspection, the unit is packaged and transported to the construction site.

[0034] During the construction phase of the pool concrete inner wall 1, the main reinforcing bars of the pool concrete inner wall 1 are first tied according to the design drawings. Φ16mm threaded steel bars are used as the main reinforcing bars, with a spacing of 200mm. Cold-rolled ribbed steel mesh 13 is added at the external corners. Φ8mm steel bars are used for the cold-rolled ribbed steel mesh 13, with a mesh spacing of 150mm×150mm. The cold-rolled ribbed steel mesh 13 is fixed to the main reinforcing bars by spot welding, with the weld spacing controlled at 250mm to ensure that the cold-rolled ribbed steel mesh 13 fits snugly against the external corner without deviation. Next, C35P8 impermeable concrete is poured to form the pool concrete inner wall 1. An immersion vibrator is used to vibrate the concrete, with vibration points spaced 400mm apart. The vibration time at each vibration point is [duration missing]. For 15-20 seconds, pay special attention to the external corners to avoid honeycomb and pitting caused by insufficient vibration. After the concrete is poured to the design elevation, use a trowel to smooth the surface of the inner wall 1 of the pool concrete. Cover with geotextile within 12 hours after pouring and use a combination of mulching and spraying for curing. Spray three times a day to ensure the geotextile is always moist. The curing period lasts for fourteen days. After curing, remove the formwork and check the flatness of the inner wall 1 of the pool concrete to ensure that the error does not exceed 3mm / 2m and that there are no obvious honeycomb or pitting on the surface. If there are local defects, repair them with polymer cement mortar. The ratio of cement, sand and latex powder in polymer cement mortar is 1:2:0.03. After repair, cure for seven days.

[0035] When constructing the polymer cement mortar leveling layer 2 and the waterproof layer, first prepare the polymer cement mortar to form the polymer cement mortar leveling layer 2. Use P.O42.5 cement, medium sand, polypropylene fiber, and redispersible latex powder in a ratio of 1:2:0.0009:0.03. Add an appropriate amount of water to adjust the consistency to 60mm, and mechanically stir for 3 minutes until uniform. Then, apply the mortar in two coats to the surface of the pool concrete inner wall 1 using a trowel. The first coat is 10mm thick. After initial setting, apply the second coat, also 10mm thick, approximately 4 hours later, for a total thickness of 20mm. Use a special rounded corner mold to press the corners into arcs with a radius of 50mm. Remove the mold after 4 hours and use a trowel to smooth the rounded surface of the polymer cement mortar leveling layer 2. After the polymer cement mortar leveling layer 2 has cured for seven days, clean the surface dust and debris, and apply two coats of polyurethane waterproof coating to form the polyurethane waterproof coating layer 3 using a brush. The first coat... The first coat is 0.8mm thick, applied along the height of the pool wall. After approximately 4 hours of surface drying and when it is no longer sticky to the touch, apply a second coat, 0.7mm thick, applied perpendicular to the first coat. Ensure that the polyurethane waterproof coating layer 3 is free of missed areas and bubbles. After the polyurethane waterproof coating layer 3 has fully cured for 24 hours, use a hot-melt method to lay a 3mm thick SBS modified bitumen membrane to form the SBS membrane waterproof layer 4. Set the temperature of the hot-melt membrane welding machine to 200℃, bake the bottom surface of the membrane to a molten state, and then quickly attach it to the surface of the polyurethane waterproof coating layer 3. Compact it with a roller. At the external corners, additional SBS membrane is laid to form a reinforcing layer of the SBS membrane waterproof layer 4. The reinforcing layer is 500mm wide and extends 250mm from the external corner to both sides. The reinforcing layer and the base layer are bonded by hot-melt bonding, with an overlap width of not less than 100mm. After the SBS membrane waterproof layer 4 is completed, conduct a 24-hour water tightness test with a water level of 100mm. No leakage indicates that it is qualified.

[0036] To strengthen the structural layer assembly process, first prepare crack-resistant cement mortar using P.O42.5 cement, medium sand, and polypropylene fiber in a ratio of 1:2:0.0006. Adjust the consistency to 65mm. Pour the mortar onto the outside of the SBS waterproof membrane layer 4 to form a crack-resistant cement mortar protective layer with a thickness of 20mm. Two hours after pouring and before initial setting, use a laser positioning instrument to mark an L-shaped installation control line along the external corner, with an accuracy of ±1mm. Simultaneously mark the installation position of the L-shaped composite reinforcing unit 5. Align the prefabricated L-shaped composite reinforcing unit 5 with the installation control line, ensuring the modified EVA buffer layer 5-1 faces the crack-resistant cement mortar protective layer. Gently tap the surface of the L-shaped composite reinforcing unit 5 with a rubber hammer, with an impact force not exceeding 50N, to embed the L-shaped composite reinforcing unit 5 into the protective layer and make it flush with the surface of the protective layer. After embedding, use a 2m straightedge to check the flatness. The accuracy is ensured to be within 1mm / 2m. If deviations exist, fine-tuning is performed until it is qualified. A water-swellable sealing strip 9 with a diameter of 8mm is embedded at the splice joint of adjacent L-shaped composite reinforcing units 5 and placed in the center. The joint is then sealed with the same type of elastic epoxy adhesive layer 5-3. The sealing joint is 10mm wide and 2mm thick. When sealing, a scraper is used to press it firmly to avoid air bubbles and voids. Finally, the PVC protective pipe 11 leading out of the L-shaped composite reinforcing unit 5 is extended along the outside of the pool wall and connected to the data monitoring box 12 next to the pool. The data monitoring box 12 is turned on and the sampling frequency is set to 1Hz. The fiber optic grating stress sensor 10 is adjusted. The stress data changes are observed by applying a small pressure to ensure that the stress and temperature signal transmission is stable and the error does not exceed 5%. After the adjustment is qualified, the PVC protective pipe 11 is fixed.

[0037] When constructing the waterproof mortar layer 6 and the anti-slip ceramic tile surface layer 7, first prepare a penetrating crystalline waterproof mortar to form the waterproof mortar layer 6. Use P.O42.5 cement, medium sand, and penetrating crystalline masterbatch in a ratio of 1:2:0.02. Add an appropriate amount of water to adjust the consistency to 70mm. After stirring evenly, use it within 30 minutes. Apply the mortar in two coats to the surface of the crack-resistant cement mortar protective layer and the L-shaped composite reinforcing unit 5. The first coat is 9mm thick. After initial setting, apply the second coat approximately 5 hours later, with a thickness of 8mm. The total thickness should be flush with the outer side of the L-shaped composite reinforcing unit 5. During application, ensure a tight bond between the waterproof mortar layer 6 and the reinforcing cement board 5-4 of the L-shaped composite reinforcing unit 5 without gaps. After construction, cover with plastic film and cure for fourteen days. After curing, test the bond strength to ensure it is not less than 0.8MPa. The waterproof mortar layer 6 then undergoes curing. After passing inspection, clean the surface dust and apply an interface treatment agent. The interface treatment agent is made of cement and latex powder in a ratio of 1:0.1, with an appropriate amount of water added to form a paste. Within 30 minutes of application, lay the anti-slip ceramic tiles to form the anti-slip ceramic tile surface layer 7. The ceramic tiles are 600mm×600mm in size and have an anti-slip coefficient of 0.85. Apply C2TES Grade 1 tile adhesive to the back of the tiles, with a thickness of 6mm. When laying the tiles, use cross clips to control the width of the tile joints to 3mm. After laying, gently tap the surface of the anti-slip ceramic tile surface layer 7 with a rubber mallet to ensure a tight bond. 24 hours after laying, fill the tile joints with waterproof grout 8. The color of waterproof grout 8 matches the tiles. After grouting, smooth the surface with a trowel and cure for seven days. After curing, clean the surface of the anti-slip ceramic tile surface layer 7 with a damp mop to remove any remaining waterproof grout 8, completing the entire construction process.

[0038] After construction, acceptance shall be conducted according to the following standards: In terms of appearance, the rounded arc of the external corners shall be uniform, the surface of the anti-slip ceramic tile layer 7 shall be clean and flat, without damage or hollow areas, and the hollow area rate shall not exceed 5% when lightly tapped with a small hammer; In terms of function, a 48-hour water tightness test shall be conducted again, and there shall be no leakage at the L-shaped composite reinforcement unit 5 and the joints, and the acquisition system composed of the fiber optic stress sensor 10 and the data monitoring box 12 shall operate normally and can display stress and temperature curves in real time; In terms of performance, the bonding strength between the L-shaped composite reinforcement unit 5 and the base layer shall be tested to ensure that it is not less than 0.8MPa, and the impermeability grade of the waterproof mortar layer 6 shall be tested to ensure that it is not less than P12. If the design requirements are met, the acceptance shall be deemed qualified.

[0039] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A corner reinforcement structure for a competition swimming pool, comprising a concrete inner wall of the pool (1), characterized in that: The outer layer of the inner concrete wall (1) of the swimming pool is sequentially provided with a polymer cement mortar leveling layer (2), a polyurethane waterproof coating layer (3), an SBS roll waterproof layer (4), a crack-resistant cement mortar protective layer, an L-shaped composite reinforcing unit (5), a waterproof mortar layer (6), and an anti-slip ceramic tile surface layer (7). The outer corner of the inner concrete wall (1) of the swimming pool is fixed with a cold-rolled ribbed steel mesh (13), and C35P8 grade impermeable concrete is used. The external corner of the polymer cement mortar leveling layer (2) is pressed into a rounded corner, and the SBS roll waterproof layer (4) is provided with a reinforcing layer at the external corner; The L-shaped composite reinforcing unit (5) is embedded in the crack-resistant cement mortar protective layer and is flush with the surface of the protective layer. From the inside to the outside, it consists of a modified EVA buffer layer (5-1), a galvanized steel plate (5-2), an elastic epoxy bonding layer (5-3), and a reinforced cement board (5-4). A fiber optic stress sensor (10) is pre-embedded between the modified EVA buffer layer (5-1) and the galvanized steel plate (5-2). Water-swellable sealing strips (9) are embedded and sealed at the joint of adjacent L-shaped composite reinforcing units (5). The fiber optic stress sensor (10) is connected to the data monitoring box (12) outside the pool through a PVC protective pipe (11). The waterproof mortar layer (6) is a penetrating crystalline waterproof mortar, and the anti-slip ceramic tile surface layer (7) is laid with tile adhesive, and the tile joints are filled with waterproof grout (8).

2. The corner reinforcement structure for a competitive swimming pool according to claim 1, characterized in that: The galvanized steel sheet (5-2) is coated with a 5-8 μm thick nano-Al2O3 ceramic coating; 10%-15% nitrile rubber particles are added to the elastic epoxy adhesive layer (5-3); the modified EVA buffer layer (5-1) has a thickness of 3-5 mm; the galvanized steel sheet (5-2) has a thickness of 2-3 mm; the elastic epoxy adhesive layer (5-3) has a thickness of 2-3 mm; and the reinforced cement board (5-4) has a thickness of 8-10 mm.

3. The corner reinforcement structure for a competitive swimming pool according to claim 1, characterized in that: The grid spacing of the cold-rolled ribbed steel mesh (13) is 150mm×150mm, and the distance between the weld points of the cold-rolled ribbed steel mesh (13) and the main steel bars of the inner wall of the pool concrete (1) is no more than 300mm.

4. The corner reinforcement structure of a competitive swimming pool according to claim 3, characterized in that: The inner wall of the pool concrete (1) is cured by covering and spraying for a period of not less than fourteen days; the mixing ratio of the polymer cement mortar leveling layer (2) is cement: medium sand: polypropylene fiber: redispersible latex powder = 1:2:0.0009:0.03, and the consistency is 50-70mm.

5. The corner reinforcement structure of a competitive swimming pool according to claim 1, characterized in that: The radius of the external corner of the polymer cement mortar leveling layer (2) is 50mm; the polyurethane waterproof coating layer (3) is applied in two coats with a total thickness of 1.5mm, and the first coat and the second coat are applied in perpendicular directions.

6. The corner reinforcement structure of a competitive swimming pool according to claim 5, characterized in that: The SBS waterproof membrane (4) is 3mm thick and is constructed by hot-melt method, with an overlap width of not less than 100mm; the width of the external corner reinforcement layer of the SBS waterproof membrane (4) is 500mm.

7. The corner reinforcement structure of a competitive swimming pool according to claim 1, characterized in that: The mix ratio of the crack-resistant cement mortar protective layer is cement: medium sand: polypropylene fiber = 1:2:0.0006, and the thickness is 20mm; the diameter of the water-swellable waterstop strip (9) is 8mm, and the expansion ratio is not less than 300%.

8. The corner reinforcement structure of a competitive swimming pool according to claim 7, characterized in that: The sealant and elastic epoxy adhesive layer (5-3) of the joint of the adjacent L-shaped composite reinforcing unit (5) are the same type; the sampling frequency of the data monitoring box (12) is 1Hz.

9. A corner reinforcement structure for a competitive swimming pool according to claim 8, characterized in that: The waterproof mortar layer (6) has a mix ratio of cement: medium sand: penetrating crystallizing masterbatch = 1:2:0.02, a consistency of 60-80mm, and a bonding strength with the L-shaped composite reinforcing unit (5) of not less than 0.8MPa; the anti-slip ceramic tile surface layer (7) has a specification of 600mm×600mm, a hollow rate of not more than 5%, and a tile joint width of 3mm.

10. A construction method for reinforcing the external corner of a competition swimming pool, characterized in that: Includes the following steps: S1: Prefabricated L-shaped composite reinforcement unit (5), processed reinforced cement board (5-4) and opened with a 45° bevel, processed galvanized steel plate (5-2) and then composited with reinforced cement board (5-4) through elastic epoxy adhesive layer (5-3), pasted modified EVA buffer layer (5-1) and pre-embedded fiber optic stress sensor (10). S2: Tie the steel bars (1) of the inner wall of the pool concrete and the cold-rolled ribbed steel mesh (13) at the external corner, pour C35P8 impermeable concrete and cure for no less than fourteen days. S3: Apply polymer cement mortar leveling layer (2) and press the external corner into a 50mm radius rounded corner, apply polyurethane waterproof coating layer (3) and then lay SBS roll waterproof layer (4) and external corner reinforcement layer; S4: Pour the crack-resistant cement mortar protective layer, laser positioning embeds the L-shaped composite reinforcement unit (5), seal the splice seam and connect and debug the fiber optic stress sensor (10) and the data monitoring box (12). S5: Pour a penetrating crystalline waterproof mortar layer (6) and cure for no less than fourteen days, lay an anti-slip ceramic tile surface layer (7) and fill with waterproof sealant (8) and cure for more than seven days.

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