Crack control structure for concrete water tank

Abstract

The utility model provides a kind of crack control structure of concrete pool, belong to underground existing building comprehensive reconstruction technical field, including expansion joint structure and reinforcing band structure.Expansion joint structure includes expansion joint body and elastic sealing body, expansion joint body is through and is set in the upper region of pool wall, and elastic sealing body is set in expansion joint body inside;Reinforcing band structure includes reinforcing band body and rigid waterstop, reinforcing band body is set in the lower region of pool wall, and the concrete strength grade of reinforcing band body is higher than the concrete strength grade of pool wall, and rigid waterstop is horizontally set in the top of reinforcing band body.The utility model provides the crack control structure of concrete pool, reduces the generation of crack, reduces pool later maintenance cost, guarantees the long-term stable operation of water conservancy project, sewage treatment project and other facilities, with good economic benefit and social benefit.

Description

Technical Field

[0001] This utility model belongs to the field of comprehensive renovation technology of existing underground buildings, and more specifically, it relates to a crack control structure for concrete water tanks. Background Technology

[0002] Concrete water tanks are widely used as important water storage structures in water conservancy projects, sewage treatment projects, and industrial water storage facilities. With the expansion of project scale and the increase in service life, the durability of concrete water tanks has become a key factor affecting the safe operation of the project. However, in actual projects, cracks in the walls of concrete water tanks are a prominent problem, not only leading to water seepage and leakage, but also, in severe cases, threatening the safety of the entire structure.

[0003] Currently, traditional concrete water tanks generally employ conventional concrete structures. This design primarily relies on load factors for strength calculations and structural design, attempting to resist stresses generated under load by increasing reinforcement and improving concrete strength. However, in engineering practice, it has been found that tank wall cracks are not mainly caused by load factors, but rather by non-load factors. The shrinkage deformation of concrete during hardening, temperature stress caused by environmental temperature changes, and temperature gradients generated by the heat of hydration released during cement hydration are the main contributing factors to cracks in concrete water tank walls. Once these cracks appear, they provide channels for water and harmful media to seep in, accelerate concrete carbonation and steel corrosion, significantly reduce the durability of the tank structure, and increase later maintenance costs and safety hazards. Utility Model Content

[0004] The purpose of this utility model is to provide a crack control structure for concrete water tanks, which aims to solve the problem of cracks appearing in the walls of concrete water tanks caused by non-load-bearing factors, thus reducing the durability of the water tank structure.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a crack control structure for a concrete water tank, comprising:

[0006] An expansion joint structure, comprising an expansion joint body and an elastic sealing body, wherein the expansion joint body is opened through the upper region of the pool wall, and the elastic sealing body is disposed inside the expansion joint body;

[0007] The reinforcing strip structure includes a reinforcing strip body and a rigid waterstop. The reinforcing strip body is disposed in the lower region of the pool wall, and the concrete strength grade of the reinforcing strip body is higher than that of the pool wall. The rigid waterstop is horizontally disposed at the top of the reinforcing strip body.

[0008] In one possible implementation, the width of the expansion joint body is 30mm, and the height of the expansion joint body is 1 / 2 the height of the pool wall.

[0009] In one possible implementation, the resilient seal includes:

[0010] A low-foaming polyethylene board is disposed in the middle of the expansion joint body.

[0011] Polysulfide sealant is applied to both the inner and outer sides of the expansion joint body and located at both ends of the low-foaming polyethylene board.

[0012] In one possible implementation, the width of the reinforcing strip body is 2m, and the distance between two adjacent reinforcing strip bodies is 30-50m.

[0013] In one possible implementation, the concrete strength grade of the reinforcing strip body is C40.

[0014] In one possible implementation, an expanding agent is disposed within the reinforcing strip body, the mass of which is 12-13% of the total mass of the reinforcing strip body.

[0015] In one possible implementation, the reinforcing strip body is provided with reinforcing strip steel bars, which penetrate the reinforcing strip body and extend into the pool wall.

[0016] In one possible implementation, wire mesh is provided on both sides of the reinforcing strip body, and the wire mesh is tied to the reinforcing strip steel bar.

[0017] In one possible implementation, the wire diameter of the wire mesh is 6mm, and the spacing between adjacent transverse wires and adjacent longitudinal wires is 50mm.

[0018] In one possible implementation, the rigid waterstop is a galvanized steel sheet, and both ends extend 500 mm beyond the reinforcing strip body.

[0019] The beneficial effects of the crack control structure for concrete water tanks provided by this utility model are as follows: Compared with the prior art, this crack control structure specifically addresses cracking problems caused by non-load-bearing factors by setting expansion joint structures and reinforcing strip structures. In the expansion joint structure, the expansion joint body is continuously opened in the upper area of ​​the water tank wall. This area is more significantly affected by temperature changes and concrete shrinkage. The presence of the expansion joint can provide deformation space for the concrete to expand and contract due to temperature changes and shrinkage deformation during the hardening process, thus alleviating the internal stress of the concrete. At the same time, an elastic seal is set inside the expansion joint body. Its elastic properties can tightly fill the expansion joint, preventing moisture and harmful media from seeping into the water tank through the expansion joint, thus maintaining the water tank's airtightness while ensuring structural deformation requirements. The reinforcing strip structure includes the reinforcing strip body set in the lower area of ​​the pool wall. The lower area usually bears greater water pressure and foundation reaction force, and the stress is complex. The reinforcing strip body is made of concrete with a strength grade higher than that of the pool wall. At the same time, it is combined with a rigid waterstop set on top of it, which can enhance the structural strength and crack resistance of the area, effectively resist the stress caused by uneven foundation settlement, water pressure changes and other factors, and further reduce the possibility of cracks.

[0020] The crack control structure for concrete water tanks provided by this utility model, through the synergistic effect of expansion joints and reinforcing strips, effectively suppresses cracks caused by non-load-bearing factors such as concrete shrinkage, temperature stress, and heat of hydration by addressing stress release and structural strength enhancement respectively. This improves the structural integrity of the concrete water tank, enhances its impermeability, prevents water leakage and harmful media erosion, and extends the service life of the water tank. Reducing crack formation lowers the later maintenance costs of the water tank and ensures the long-term stable operation of water conservancy projects, sewage treatment projects, and other facilities, resulting in significant economic and social benefits. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A schematic diagram of the crack control structure for the concrete water tank provided by this utility model;

[0023] Figure 2 for Figure 1 A sectional view along the middle AA;

[0024] Figure 3 for Figure 1 A cross-sectional view along the middle BB.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Expansion joint body; 2. Reinforcing strip body; 3. Low-foaming polyethylene board; 4. Polysulfide sealant; 5. Reinforcing steel bars; 6. Wire mesh; 7. Rigid waterstop. Detailed Implementation

[0027] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0028] Please see Figures 1 to 3 The present invention describes a crack control structure for a concrete water tank. The crack control structure for the concrete water tank includes an expansion joint structure and a reinforcing strip structure. The expansion joint structure includes an expansion joint body 1 and an elastic sealing body. The expansion joint body 1 is opened through the upper region of the water tank wall, and the elastic sealing body is disposed inside the expansion joint body 1. The reinforcing strip structure includes a reinforcing strip body 2 and a rigid waterstop 7. The reinforcing strip body 2 is disposed in the lower region of the water tank wall, and the concrete strength grade of the reinforcing strip body 2 is higher than that of the water tank wall. The rigid waterstop 7 is horizontally disposed at the top of the reinforcing strip body 2.

[0029] The crack control structure for concrete water tanks provided by this utility model, compared with the prior art, specifically addresses cracking problems caused by non-load-bearing factors by incorporating an expansion joint structure and a reinforcing strip structure. In the expansion joint structure, the expansion joint body 1 is continuously opened in the upper region of the water tank wall. This region is more significantly affected by temperature changes and concrete shrinkage. The presence of the expansion joint provides deformation space for the concrete during thermal expansion and contraction due to temperature changes and shrinkage deformation during the hardening process, thus alleviating internal stress in the concrete. Simultaneously, an elastic seal is disposed inside the expansion joint body 1. Its elastic properties tightly fill the expansion joint, preventing moisture and harmful media from seeping into the water tank through the expansion joint, maintaining the water tank's airtightness while ensuring structural deformation requirements. The reinforcing strip structure includes a reinforcing strip body 2 installed in the lower part of the pool wall. The lower part usually bears greater water pressure and foundation reaction force, and the stress is complex. The reinforcing strip body 2 is made of concrete with a strength grade higher than that of the pool wall. At the same time, it is combined with a rigid waterstop 7 installed on top of it, which can enhance the structural strength and crack resistance of the area, effectively resist the stress caused by uneven foundation settlement, water pressure changes and other factors, and further reduce the possibility of cracks.

[0030] The crack control structure for concrete water tanks provided by this utility model, through the synergistic effect of expansion joints and reinforcing strips, effectively suppresses cracks caused by non-load-bearing factors such as concrete shrinkage, temperature stress, and heat of hydration by addressing stress release and structural strength enhancement respectively. This improves the structural integrity of the concrete water tank, enhances its impermeability, prevents water leakage and harmful media erosion, and extends the service life of the water tank. Reducing crack formation lowers the later maintenance costs of the water tank and ensures the long-term stable operation of water conservancy projects, sewage treatment projects, and other facilities, resulting in significant economic and social benefits.

[0031] Specifically, the width of the expansion joint body 1 is 30mm, providing ample buffer space for the deformation of concrete caused by temperature changes and its own shrinkage. When the ambient temperature rises, the concrete expands due to heat, and the expansion joint can effectively absorb the stress generated by the expansion, preventing cracking in the upper part of the pool wall due to stress concentration. When the temperature drops or the concrete hardens and shrinks, the expansion joint can accommodate the shrinkage deformation of the concrete, reducing internal tensile stress. The height of the expansion joint body 1 is half the height of the pool wall, which precisely covers the critical area of ​​the upper part of the pool wall that is easily affected by temperature changes and shrinkage. Compared with setting an expansion joint along the entire height, it can effectively release the stress in the upper area, avoid excessive weakening of the structural integrity caused by the expansion joint running through the entire pool wall, and reduce the cost and difficulty of sealing treatment.

[0032] Please see Figure 2 The elastic sealant comprises a low-foaming polyethylene board 3 and a polysulfide sealant 4. The low-foaming polyethylene board 3 and the polysulfide sealant 4 together constitute a composite waterproof structure.

[0033] Low-foamed polyethylene board 3 has a density of 35-45 kg / m³, possessing lightweight and stable physical properties, and a compression resilience rate of ≥80%. This allows it to effectively buffer the deformation stress of concrete caused by temperature changes and shrinkage / expansion within the expansion joint body 1. When concrete deforms, the polyethylene board can absorb stress through compression deformation, and then recover some of the deformation due to its high resilience, continuously filling the expansion joint and preventing crack propagation caused by stress concentration. Positioning it in the middle of the expansion joint body 1 provides stable support and a buffer core for the entire expansion joint, ensuring that the expansion joint maintains good deformation adaptability during long-term use.

[0034] Polysulfide sealant 4 is applied to both the inner and outer sides of the expansion joint body 1 and located at both ends of the low-foaming polyethylene board 3. Its excellent sealing performance effectively isolates external moisture and harmful media. Polysulfide sealant 4 can tightly adhere to the expansion joint wall and both ends of the polyethylene board, forming a strong sealing layer. Even when the expansion joint undergoes minor deformation, it can maintain the sealing effect due to its good elasticity and adhesion, preventing moisture and corrosive substances from seeping into the pool or eroding the concrete structure through the expansion joint.

[0035] This composite waterproof structure utilizes the buffering properties of low-foaming polyethylene board 3 to reduce stress damage to the concrete at the expansion joint, while also ensuring the waterproof and seepage-resistant capabilities of the pool through the sealing properties of polysulfide sealant 4. The synergistic effect of the two significantly improves the reliability and durability of the expansion joint structure, thereby enhancing the overall seepage resistance and structural stability of the concrete pool, reducing maintenance costs and safety risks caused by leakage, and extending the service life of the pool.

[0036] Specifically, the reinforcing strip body 2 is 2m wide, providing sufficient concrete volume to fully utilize the performance advantages of high-strength concrete and form a stable reinforcing structure in the lower part of the pool wall. Compared to a narrower reinforcing strip, the 2m wide reinforcing strip can more effectively disperse the stress generated at the bottom of the pool due to water pressure and foundation reaction, enhancing the area's resistance to adverse factors such as uneven settlement and water pressure changes, and greatly reducing the possibility of crack formation.

[0037] The spacing between adjacent reinforcing strips 2 is 30-50m, achieving a rational allocation of resources while ensuring the overall structural strength. This spacing ensures that the reinforcing strips can effectively control and reinforce the lower area of ​​the pool wall, avoiding stress control blind spots caused by excessive spacing, and also avoiding material waste and increased costs caused by excessively close spacing. Through a reasonable spacing arrangement, the reinforcing strips can work together to form a continuous and uniform reinforcement system in the lower part of the pool wall. This allows stress to be orderly transferred and distributed among the reinforcing strips when the pool is subjected to external loads and environmental effects, further improving the overall stability and crack resistance of the pool structure.

[0038] Specifically, the concrete strength grade of the reinforcing strip body 2 is C40, while the concrete strength grade of the pool is C35. The compressive strength (standard value 40MPa) and tensile strength (approximately 2.39MPa) of C40 concrete are significantly higher than those of C35 concrete (compressive standard value 35MPa, tensile strength approximately 2.20MPa). It can effectively bear concentrated loads such as water pressure at the bottom of the pool wall and foundation reaction force. Through the stress bearing capacity of high-strength materials, the tensile stress and shear stress in the lower area are controlled at a lower level, avoiding cracks at the root of the pool wall due to excessive stress.

[0039] Preferably, an expansive agent is incorporated into the reinforcing strip body 2, with the mass of the expansive agent being 12-13% of the total mass of the reinforcing strip body 2. Simultaneously, an expansive agent is also added to the concrete of the pool wall, at a concentration of 8-10%. This differentiated design of expansive agent addition brings significant benefits to the control of cracks in concrete pools. In the reinforcing strip body 2, a higher proportion of expansive agent can fully compensate for the shrinkage deformation during the concrete hardening process, effectively offsetting the tensile stress generated by factors such as cement hydration heat and temperature changes. When the concrete hardens in the reinforcing strip body 2, the expansive agent reacts with the cement hydration products, producing a moderate expansion effect, generating a certain amount of compressive stress within the concrete, thereby offsetting the tensile stress that may lead to cracking and greatly reducing the probability of cracks appearing in the reinforcing strip area.

[0040] Please see Figure 3 The reinforcing strip body 2 is equipped with reinforcing steel bars 5. These reinforcing steel bars 5 work together with C40 high-strength concrete to significantly enhance the tensile and shear strength of the reinforcing strip body 2, preventing the concrete from cracking due to exceeding its ultimate tensile strength. The high tensile strength of the steel bars and the high compressive strength of the concrete complement each other, making the reinforcing strip a solid defense against stress concentration and significantly improving the structural bearing capacity of the area.

[0041] Furthermore, the reinforcing steel bar 5 extends into the pool wall, achieving a reliable connection between the reinforcing strip and the pool wall structure, forming a continuous stress-bearing system. When the pool deforms due to factors such as temperature changes or uneven foundation settlement, the reinforcing steel bar 5 can uniformly transfer stress to the entire pool wall structure, allowing the reinforcing strip and the pool wall to deform together, avoiding stress abrupt changes at the connection point that could lead to cracks.

[0042] Please see Figure 3 Steel wire mesh 6 is installed on both sides of the reinforcing strip body 2, and the steel wire mesh 6 is tied to the reinforcing strip steel bars 5. The steel wire mesh 6 can restrict the flow range of concrete of different strength grades, avoid the mixing of C40 concrete and C35 concrete during the pouring process, and ensure that the reinforcing strip and the main body of the pool wall maintain their design strength, thus ensuring structural quality from the source of construction. At the same time, after the steel wire mesh 6 is tied and fixed to the reinforcing strip steel bars 5, it forms a stable three-dimensional frame, providing support during concrete vibration, preventing concrete segregation and aggregate settling caused by vibration, and helping to improve the density and uniformity of the reinforcing strip concrete. During the concrete hardening and shrinkage stage, the steel wire mesh 6 and the reinforcing strip steel bars 5 work together to resist cracking. During the hardening process, concrete will generate tensile stress due to shrinkage deformation. The steel wire mesh 6, with its own rigidity and the bonding force with the concrete, constrains the shrinkage deformation of the concrete, dispersing the shrinkage stress throughout the reinforcing strip area.

[0043] Preferably, the wire diameter of the wire mesh 6 is 6mm, which ensures sufficient rigidity while also taking into account ease of construction and economy. The spacing between adjacent transverse wires and adjacent longitudinal wires is 50mm, which provides a finer restraint effect and effectively suppresses the generation of micro-cracks.

[0044] Specifically, the rigid waterstop 7 is made of galvanized steel sheet, using 3mm thick Q235B hot-rolled steel sheet, 300mm wide, 3000mm long, extending 500mm beyond the expansion reinforcement strip on each side. The surface is coated with epoxy zinc-rich anti-rust paint, with a thickness ≥80μm; double-sided galvanizing treatment, with a zinc layer thickness ≥20μm. This dual protection of double-sided galvanizing and epoxy zinc-rich anti-rust paint constructs a composite anti-corrosion system of electrochemical protection + physical isolation. The galvanized layer protects the steel sheet through sacrificial anodes, while the epoxy zinc-rich paint further strengthens the protection, reducing the cost of mid-term repairs.

[0045] A galvanized steel sheet is centrally positioned between the expansion joint body 1 and the reinforcing strip body 2, with its upper and lower halves embedded 150mm into the concrete. The galvanized steel sheet spans the two key areas of the expansion joint structure and the reinforcing strip structure, forming a continuous waterproof barrier. When water pressure is generated inside the pool, or when external moisture seeps in, the galvanized steel sheet effectively blocks water penetration by extending the seepage path.

[0046] The end of the waterstop steel plate extends 500mm into the expansion reinforcement strip and is welded and fixed to the wire mesh 6. This extension increases the contact area with the concrete, forming a three-dimensional waterproof barrier, while the wire mesh 6 prevents displacement during vibration. When the structure settles or deforms due to temperature, the extension provides a deformation buffer space, alleviating stress concentration, effectively inhibiting crack formation, and ensuring long-term reliable waterproofing and structural stability of the pool.

[0047] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A crack control structure for a concrete pool, characterized by, include: An expansion joint structure, comprising an expansion joint body (1) and an elastic sealing body, wherein the expansion joint body (1) is opened through the upper region of the pool wall and the elastic sealing body is disposed inside the expansion joint body (1); The reinforcing strip structure includes a reinforcing strip body (2) and a rigid waterstop (7). The reinforcing strip body (2) is located in the lower part of the pool wall. The concrete strength grade of the reinforcing strip body (2) is higher than that of the pool wall. The rigid waterstop (7) is horizontally located at the top of the reinforcing strip body (2).

2. The crack control structure for a concrete pool according to claim 1, wherein The width of the expansion joint body (1) is 30mm, and the height of the expansion joint body (1) is 1 / 2 of the height of the pool wall.

3. The crack control structure for a concrete pool according to claim 1, wherein The elastic sealing body includes: A low-foaming polyethylene board (3) is disposed in the middle of the expansion joint body (1). Polysulfide sealant (4) is sealed on both the inner and outer sides of the expansion joint body (1) and located at both ends of the low-foaming polyethylene board (3).

4. The crack control structure for a concrete pool according to claim 1, wherein The width of the reinforcing strip body (2) is 2m, and the distance between two adjacent reinforcing strip bodies (2) is 30-50m.

5. The crack control structure for a concrete pool according to claim 1, wherein The concrete strength grade of the reinforcing strip body (2) is C40.

6. The crack control structure for a concrete pool according to claim 5, wherein An expanding agent is provided inside the reinforcing belt body (2), and the mass of the expanding agent is 12-13% of the total mass of the reinforcing belt body (2).

7. The crack control structure for a concrete pool according to claim 1, wherein The reinforcing strip body (2) is provided with reinforcing strip steel bars (5), which penetrate the reinforcing strip body (2) and extend into the pool wall.

8. The crack control structure for a concrete pool according to claim 7, wherein Steel wire mesh (6) is provided on both sides of the reinforcing strip body (2), and the steel wire mesh (6) is tied to the reinforcing strip steel bar (5).

9. The crack control structure for a concrete pool defined in claim 8, wherein, The wire diameter of the wire mesh (6) is 6mm, and the spacing between adjacent transverse wires and adjacent longitudinal wires is 50mm.

10. The crack control structure for a concrete pool according to claim 1, wherein The rigid waterstop (7) is made of galvanized steel plate, and the length of both ends extending out of the reinforcing strip body (2) is 500mm.

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