A heavy non-ferrous metal smelting project has a pool corrosion and seepage prevention structure

Abstract

The utility model belongs to the technical field of building engineering, specifically discloses a heavy nonferrous metal smelting engineering existing pool anticorrosive and anti -infiltration structure. The reinforced concrete bottom plate and lateral wall of structure are closed into pool, the surface of reinforced concrete bottom plate is equipped with waterproof coating, geotextile I, high density polyethylene geomembrane, geotextile II, fine stone concrete layer, epoxy glass steel isolation layer and anticorrosive surface layer in proper order, the surface of reinforced concrete lateral wall is equipped with waterproof coating, geotextile I, high density polyethylene geomembrane, geotextile II, polymer cement mortar layer, epoxy glass steel isolation layer and anticorrosive surface layer in proper order, the layer of aforementioned same name of reinforced concrete bottom plate and lateral wall surface, geotextile and geomembrane correspond to head -tail link, and fine stone concrete layer and polymer cement mortar layer correspond to head -tail link. The utility model has the characteristics of simple structure, convenient construction, good anticorrosive and anti -infiltration performance and low cost.

Description

Technical Field

[0001] This utility model belongs to the field of building engineering technology, specifically relating to an anti-corrosion and anti-seepage structure for existing water tanks in heavy non-ferrous metal smelting projects that is simple in structure, convenient in construction, has good anti-corrosion and anti-seepage performance, and low in cost. Background Technology

[0002] In non-ferrous metal smelting projects, according to national standards, measures should be taken in both key seepage prevention zones and general seepage prevention zones to prevent pollutants from flowing into simple seepage prevention zones or non-pollution prevention zones. Currently, many existing reinforced concrete water tanks in key seepage prevention zones are cracked and deformed due to their age and long-term exposure to corrosive media such as high concentrations of heavy metal ions, strong acids, strong alkalis, and high temperatures, resulting in varying degrees of leakage and pollution of soil and groundwater. Therefore, it is urgent to repair these water tanks.

[0003] Traditional water tank seepage and corrosion prevention technologies include self-waterproof concrete structures and surface coating protection technologies. Self-waterproof concrete structures utilize the highly alkaline environment of concrete (pH>12.5) to form a passivation film on the surface of the reinforcing steel, the low permeability of concrete to slow down the intrusion of corrosive media, and the reasonable increase of the protective layer thickness to prolong the chloride ion penetration time; however, under long-term corrosive conditions, concrete carbonation will cause the pH value to drop, the passivation film to be destroyed, and the reinforcing steel to rust, thus affecting the seepage and corrosion prevention performance. Surface coating protection technologies include epoxy resin coatings, polyurea coatings, and glass flake putty coatings. For example, epoxy resin coatings are mostly used in moderately corrosive areas (such as areas with fluctuating water levels in pool walls). Although they are resistant to acids and alkalis, they have poor UV resistance and a high curing shrinkage rate (0.3-0.5%), which makes them prone to blistering. Polyurethane coatings are mostly used in heavily corrosive areas (such as sludge areas at the bottom of pools). They have excellent corrosion resistance, but construction requires specialized equipment (such as heated sprayers), and recoating is required every three years. Glass flake coatings are mostly used in strongly acidic environments. The overlapping structure of the flakes can extend the medium penetration path, and they have strong impermeability and are easy to repair. However, they also have the disadvantage of strict requirements for the construction environment (temperature 15-30℃, humidity ≤85%) and the dependence of interlayer bonding on interface treatment.

[0004] Existing technologies include lining protection techniques such as fiberglass (FRP) lining, rubber lining, and PVC / PP lining. While these offer excellent seepage prevention, corrosion resistance, wear resistance, and impact resistance, they suffer from drawbacks such as long construction cycles, susceptibility to high-temperature aging, low mechanical strength, and relatively high costs. Therefore, they are primarily used for seepage prevention and corrosion protection in highly corrosive environments and high-cleanliness requirements, such as electrolytic cells and leaching tanks. To address the shortcomings of single concrete self-waterproofing structures, surface coating protection technologies, and lining protection technologies, some approaches combine concrete self-waterproofing structures with surface coatings (such as polyurea or glass flake putty). This dual mechanism of "structural self-protection + external protection" balances structural strength and corrosion resistance, making it suitable for high-corrosion-risk areas. However, internal concrete leakage may be "invisibly transmitted" through the coating, making it difficult to detect on the surface in time. Once the coating fails, internal problems may have already spread. Furthermore, the interlayer bonding and tear resistance are relatively weak, making it difficult to effectively resist cracking and deformation. There is also a multi-layer lining composite technology that combines fiberglass lining with glass flake mortar surface layer, which enhances impermeability and wear resistance through complementary advantages. This technology is often used in dynamic working conditions with particle erosion (such as slurry conveying tanks); however, it has problems such as insufficient interlayer bonding and poor high-temperature resistance. Utility Model Content

[0005] To address the problems existing in the background technology, this utility model provides a corrosion and seepage prevention structure for existing water tanks in heavy non-ferrous metal smelting projects that is simple in structure, convenient in construction, has good corrosion and seepage prevention performance, and is low in cost.

[0006] The corrosion and seepage prevention structure of the existing water tank in the heavy non-ferrous metal smelting project of this utility model is implemented as follows: It includes a reinforced concrete base slab and reinforced concrete sidewalls, which together form a water tank; the surface of the reinforced concrete base slab is sequentially provided with a waterproof coating, geotextile I, high-density polyethylene geomembrane, geotextile II, fine stone concrete layer, epoxy fiberglass isolation layer and anti-corrosion surface layer; the surface of the reinforced concrete sidewalls is sequentially provided with a waterproof coating, geotextile I, high-density polyethylene geomembrane, geotextile II, polymer cement mortar layer, epoxy fiberglass isolation layer and anti-corrosion surface layer; the aforementioned layers with the same names, geotextiles and geomembranes on the surfaces of the reinforced concrete base slab and reinforced concrete sidewalls are connected end to end, and the fine stone concrete layer and polymer cement mortar layer are connected end to end.

[0007] Furthermore, the waterproof coating is a cement-based penetrating crystalline waterproof coating layer, and the thickness of the waterproof coating is 0.8 to 1.2 mm.

[0008] Furthermore, the geotextile I and geotextile II are identical, both possessing a nominal tensile strength of not less than 30 kN / m and a unit area mass of not less than 450 g / m². 2 Long-filament geotextile.

[0009] Furthermore, the thickness of the high-density polyethylene geomembrane is 1.6–2.4 mm, and the density of the high-density polyethylene therein is ≥0.932 g / cm³. 3 .

[0010] Furthermore, the fine aggregate concrete layer is a C30 fine aggregate concrete layer with a thickness of 20-40 mm, and the polymer cement mortar layer has a thickness of 8-12 mm.

[0011] Furthermore, the polymer in the polymer cement mortar layer is any one or any combination of acrylate emulsion, ethylene-vinyl acetate emulsion, styrene-butadiene latex, and redispersible latex powder.

[0012] Furthermore, the thickness of the epoxy fiberglass isolation layer is 3–8 mm.

[0013] Furthermore, the anti-corrosion surface layer is an epoxy anti-corrosion mortar layer with a thickness of 8-10 mm.

[0014] Furthermore, the waterproof coating, geotextile I, high-density polyethylene geomembrane, and geotextile II on the surface of the reinforced concrete sidewall extend upward in sequence and bend outward to adhere to the top of the reinforced concrete sidewall.

[0015] This utility model has the following beneficial effects:

[0016] 1. The anti-corrosion and anti-seepage structure of this utility model innovatively constructs a multi-protection system of "flexible anti-seepage membrane + rigid structural layer + chemical anti-corrosion layer". The bottom waterproof coating can penetrate into the concrete pores to enhance the self-waterproofing ability to repair micro-defects in the base surface. The geotextile forms a stress buffer to solve the problem of hollowing caused by the curing shrinkage of epoxy resin. The high-density polyethylene geomembrane forms a continuous physical barrier to isolate the medium from penetration. The bottom plate of the pool adopts a rigid fine stone concrete layer to resist settlement pressure. The flexible polymer mortar layer on the side wall of the pool absorbs structural deformation. The surface epoxy fiberglass isolation layer and anti-corrosion surface layer resist strong corrosion and mechanical wear, thereby significantly improving the anti-seepage and anti-corrosion performance of the pool, reducing the risk of leakage and corrosion, and avoiding soil and groundwater pollution.

[0017] 2. Compared with traditional technologies, the anti-corrosion and anti-seepage structure of this utility model uses mature materials and construction technology, and does not require special equipment or complicated processes. For example, the operation of laying geotextile and applying cement mortar is simple, so the construction is simple and the material cost is low. Moreover, due to the adoption of standardized layered construction, the construction cycle can be greatly shortened.

[0018] 3. The anti-corrosion and anti-seepage structure of this utility model eliminates the traditional "seepage blind spot" by bending the layers on the side wall at the top of the pool. Moreover, the seamless connection of each material layer forms a 360° seal, realizing a fully enclosed anti-seepage system for existing water pools. In particular, the use of fine stone concrete layer for the bottom plate and polymer cement mortar layer for the side wall can enhance the structural strength, while geotextile plays a reinforcing role, thereby enhancing the stability of the overall structure, improving the water pool's resistance to deformation and cracking, and extending its service life.

[0019] In summary, this utility model comprehensively considers the requirements for corrosion prevention and leakage prevention. While retaining the original reinforced concrete water tank, it constructs a multi-protection system of "flexible impermeable membrane + rigid structural layer + chemical anti-corrosion layer". Through unique structural design and material combination, it effectively solves the seepage prevention and corrosion prevention problems of existing water tanks. The overall design features simple structure, convenient construction, good corrosion and seepage prevention performance, and low cost. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] In the diagram: 1-Reinforced concrete base slab, 2-Reinforced concrete sidewall, 3-Water tank, 4-Waterproof coating, 5-Geotextile I, 6-High-density polyethylene geomembrane, 7-Geotextile II, 8-Fine aggregate concrete layer, 9-Polymer cement mortar layer, 10-Epoxy fiberglass isolation layer, 11-Anti-corrosion surface layer. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this does not limit the present invention in any way. Any changes or improvements made based on the teachings of the present invention shall fall within the protection scope of the present invention.

[0023] like Figure 1 As shown, the present invention relates to an anti-corrosion and anti-seepage structure for existing water tanks in heavy non-ferrous metal smelting projects, comprising a reinforced concrete base slab 1 and reinforced concrete sidewalls 2, wherein the reinforced concrete base slab 1 and reinforced concrete sidewalls 2 together form a water tank 3; the surface of the reinforced concrete base slab 1 is sequentially provided with a waterproof coating 4, geotextile I 5, high-density polyethylene geomembrane 6, geotextile II 7, fine stone concrete layer 8, epoxy fiberglass isolation layer 10, and anti-corrosion surface layer 11; the surface of the reinforced concrete sidewalls 2 is sequentially provided with a waterproof coating 4, geotextile I 5, high-density polyethylene geomembrane 6, geotextile II 7, polymer cement mortar layer 9, epoxy fiberglass isolation layer 10, and anti-corrosion surface layer 11; the aforementioned layers, geotextiles, and geomembranes with the same names on the surfaces of the reinforced concrete base slab 1 and reinforced concrete sidewalls 2 are connected end-to-end, and the fine stone concrete layer 8 and polymer cement mortar layer 9 are connected end-to-end.

[0024] The waterproof coating 4 is a cement-based penetrating crystalline waterproof coating layer, and the thickness of the waterproof coating 4 is 0.8 to 1.2 mm.

[0025] Geotextile I5 is identical to geotextile II7, both having a nominal tensile strength of not less than 30 kN / m and a unit area mass of not less than 450 g / m². 2 Long-filament geotextile.

[0026] The high-density polyethylene geomembrane 6 has a thickness of 1.6–2.4 mm and a high-density polyethylene density ≥ 0.932 g / cm³. 3 .

[0027] The fine aggregate concrete layer 8 is a C30 fine aggregate concrete layer with a thickness of 20-40mm, and the polymer cement mortar layer 9 has a thickness of 8-12mm.

[0028] In addition to meeting the relevant requirements of the current industry standard JC / T 984 "Polymer Cement Waterproof Mortar", the polymer cement waterproof mortar layer 9 shall also comply with the following provisions:

[0029] 1. The compressive strength should not be less than 24.0 MPa;

[0030] 2. The flexural strength should not be less than 8.0 MPa;

[0031] 3. The 28-day bond strength should not be less than 1.2 MPa.

[0032] The polymer in the polymer cement mortar layer 9 is any one or any combination of acrylate emulsion, ethylene-vinyl acetate emulsion, styrene-butadiene latex, and redispersible latex powder.

[0033] The thickness of the epoxy fiberglass isolation layer 10 is 3-8 mm.

[0034] The anti-corrosion surface layer 11 is an epoxy anti-corrosion mortar layer with a thickness of 8 to 10 mm.

[0035] The waterproof coating 4, geotextile I 5, high-density polyethylene geomembrane 6, and geotextile II 7 on the surface of the reinforced concrete sidewall 2 extend upward in sequence and bend outward to adhere to the top of the reinforced concrete sidewall 2.

[0036] It should be noted that the aforementioned cement-based penetrating crystalline waterproof coating layer, long-filament geotextile, high-density polyethylene (HDPE) geomembrane 6, fine stone concrete layer 8, polymer cement mortar layer 9, epoxy fiberglass isolation layer 10, and epoxy anti-corrosion mortar layer are all made using current materials and construction processes. The specific material formulas and construction methods will not be elaborated here.

[0037] Construction process of this utility model:

[0038] like Figure 1 As shown, the construction process is as follows:

[0039] 1. Clean the existing reinforced concrete water tank 3, including the reinforced concrete bottom slab 1 and the reinforced concrete sidewalls 2.

[0040] 2. After cleaning the surfaces of the reinforced concrete base slab 1 and the reinforced concrete sidewalls 2, conduct a water storage test on the water tank 3 and seal any cracks and leaks.

[0041] 3. Apply a 1.0mm thick layer of cement-based penetrating crystalline waterproof coating to the surface of the reinforced concrete base slab 1 and the reinforced concrete sidewall 2 to form a waterproof coating 4.

[0042] 4. Lay long-filament geotextile (nominal tensile strength not less than 30kN / m, unit area mass not less than 450g / m) on the surface of waterproof coating 4. 2 ), forming geotextile I5.

[0043] 5. Lay a 2mm thick high-density polyethylene (HDPE) geomembrane 6 on geotextile I5 (where the density of HDPE is ≥0.932g / cm³). 3 ).

[0044] 6. Lay a long-filament geotextile (nominal tensile strength not less than 30kN / m, unit area mass not less than 450g / m²) on the surface of the high-density polyethylene geomembrane 6. 2 ), forming geotextile II 7.

[0045] 7. Spray a 30mm thick layer of C30 fine stone concrete onto the surface of geotextile II7 on the reinforced concrete base slab 1 to form a fine stone concrete layer 8. Spray a 10mm thick layer of polymer cement mortar onto the surface of geotextile II7 on the reinforced concrete sidewall 2 to form a polymer cement mortar layer 9.

[0046] 8. Apply a 5mm thick epoxy fiberglass isolation layer 10 to the surfaces of both the fine stone concrete layer 8 and the polymer cement mortar layer 9.

[0047] 9. Spray an 8-10mm thick epoxy anti-corrosion mortar layer on the surface of the epoxy fiberglass isolation layer 10 to form an anti-corrosion surface layer 11, thus completing the construction of the anti-corrosion and anti-seepage structure of the existing water tank 3 (wherein, the aforementioned layers 4 to 11, geotextile and geomembrane on the surface of the reinforced concrete sidewall 2 extend upward in sequence and bend outward to the outside of the water tank 3 to adhere to the top of the reinforced concrete sidewall 2).

[0048] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A corrosion-resistant and seepage-proof structure for an existing water tank in a heavy non-ferrous metal smelting project, comprising a reinforced concrete base slab (1) and reinforced concrete sidewalls (2), wherein the reinforced concrete base slab (1) and the reinforced concrete sidewalls (2) together form a water tank (3); characterized in that: The surface of the reinforced concrete base slab (1) is sequentially provided with a waterproof coating (4), geotextile I (5), high-density polyethylene geomembrane (6), geotextile II (7), fine stone concrete layer (8), epoxy fiberglass isolation layer (10) and anti-corrosion surface layer (11). The surface of the reinforced concrete sidewall (2) is sequentially provided with a waterproof coating (4), geotextile I (5), high-density polyethylene geomembrane (6), geotextile II (7), polymer cement mortar layer (9), epoxy fiberglass isolation layer (10) and anti-corrosion surface layer (11). The aforementioned layers, geotextiles and geomembranes with the same names provided on the surface of the reinforced concrete base slab (1) and the reinforced concrete sidewall (2) are connected end to end. The fine stone concrete layer (8) and the polymer cement mortar layer (9) are connected end to end.

2. The anti-corrosion and anti-seepage structure for existing water tanks in heavy non-ferrous metal smelting projects according to claim 1, characterized in that: The waterproof coating (4) is a cement-based penetrating crystalline waterproof coating layer, and the thickness of the waterproof coating (4) is 0.8 to 1.2 mm.

3. The anti-corrosion and anti-seepage structure for existing water tanks in heavy non-ferrous metal smelting projects according to claim 1, characterized in that: Geotextile I (5) is the same as geotextile II (7), and both have a nominal tensile strength of not less than 30 kN / m and a unit area mass of not less than 450 g / m. 2 Long-filament geotextile.

4. The anti-corrosion and anti-seepage structure for existing water tanks in heavy non-ferrous metal smelting projects according to claim 1, characterized in that: The high-density polyethylene geomembrane (6) has a thickness of 1.6–2.4 mm and a high-density polyethylene density ≥ 0.932 g / cm³. 3 .

5. The anti-corrosion and anti-seepage structure for existing water tanks in heavy non-ferrous metal smelting projects according to claim 1, characterized in that: The fine stone concrete layer (8) is a C30 fine stone concrete layer with a thickness of 20-40 mm, and the polymer cement mortar layer (9) has a thickness of 8-12 mm.

6. The anti-corrosion and anti-seepage structure for existing water tanks in heavy non-ferrous metal smelting projects according to claim 5, characterized in that: The polymer in the polymer cement mortar layer (9) is any one or any combination of acrylate emulsion, ethylene-vinyl acetate emulsion, styrene-butadiene latex, and redispersible latex powder.

7. The anti-corrosion and anti-seepage structure for existing water tanks in heavy non-ferrous metal smelting projects according to claim 1, characterized in that: The thickness of the epoxy fiberglass isolation layer (10) is 3-8 mm.

8. The anti-corrosion and anti-seepage structure for existing water tanks in heavy non-ferrous metal smelting projects according to claim 1, characterized in that: The anti-corrosion surface layer (11) is an epoxy anti-corrosion mortar layer with a thickness of 8 to 10 mm.

9. The anti-corrosion and anti-seepage structure for existing water tanks in heavy non-ferrous metal smelting projects according to any one of claims 1 to 8, characterized in that: The waterproof coating (4), geotextile I (5), high-density polyethylene geomembrane (6) and geotextile II (7) on the surface of the reinforced concrete sidewall (2) extend upward in sequence and bend outward to the outside of the pool (3) to adhere to the top of the reinforced concrete sidewall (2).

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