Leaking stoppage method and leaking stoppage material for large-volume macroporous concrete through cracks

Abstract

The invention discloses a leaking stoppage method and a leaking stoppage material for large-volume macroporous concrete through cracks, and belongs to the field of building leakage treatment. The leaking stoppage method comprises the steps that a straight deep hole and an inclined shallow hole are formed in a crack, an acrylate grouting material and a quick-hardening inorganic grouting material are sequentially poured into the straight deep hole, and an epoxy resin grouting material is poured into the inclined shallow hole. According to the leaking stoppage method, the problem of insufficient coverage of concrete structure defect slurry is solved, all-around filling is achieved from inside to outside, and the integrity of the structure is guaranteed.

Description

Technical Field

[0001] The invention relates to the field of building leakage control, and in particular to a plugging method for penetrating cracks in large-volume and large-pore concrete and a plugging material thereof. Background Art

[0002] The background technology of concrete plugging mainly involves the leakage problem of concrete structure in buildings and its solution. Concrete structure is prone to water infiltration due to the presence of tiny cracks or pores. Especially when the temperature changes and causes the water to freeze or expand, the cracks will further expand, seriously affecting the service life and structural bearing capacity of the building. Therefore, concrete anti-seepage and plugging technology is particularly important.

[0003] Traditional plugging methods include direct plugging, offline plugging, wooden wedge plugging, etc. These methods are mostly suitable for local treatment of holes and cracks. Among them, drilling is a commonly used technical means. The drilling method is suitable for group leakage and point leakage caused by loose concrete. However, for irregular cracks and deep leakage, traditional methods are not effective. Therefore, grouting plugging technology came into being. Grouting plugging is to inject specific chemical materials into cracks or holes, use highly fluid materials to fill the gaps inside the structure, and form a sealed barrier after solidification to prevent water penetration. This method is not only suitable for concrete structures, but also widely used in engineering fields such as basements, tunnels, and dams.

[0004] There are many types of grouting materials, including cement slurry, epoxy resin, polyurethane, methacrylate, etc. Although acrylate grouting materials have excellent waterproof and fast curing properties, they have poor weather resistance and are easily affected by oxidation, hydrolysis and light, leading to aging. In addition, their curing speed is fast, the construction time is limited, and they have high requirements for the construction environment and preparation work. If they are not handled properly, they may affect the waterproof effect and project quality. Inorganic fast-hardening grouting materials have the advantages of high strength, fast curing speed, rapid formation of stable structural support, relatively low material cost, and good environmental protection. However, their disadvantages are that they have high requirements for construction conditions, require strict control of the ratio and mixing time, and the toughness of the cured material is poor and easy to crack. The advantages of epoxy resin grouting materials include high strength, no shrinkage to ensure high precision, corrosion resistance, creep resistance to adapt to harsh working conditions. However, their disadvantages are low elongation after curing, high brittleness, high viscosity, poor fluidity, and poor aging resistance. They are prone to embrittlement and degradation under external factors such as light, heat, and water. Summary of the invention

[0005] In view of the above shortcomings of the prior art, the purpose of the present invention is to provide a method and material for plugging through cracks in large-volume and large-pore concrete. Compared with traditional plugging materials and processes, the plugging method of the present invention solves the problem of insufficient slurry coverage of concrete structural defects, achieves all-round filling from the inside to the outside, and ensures the integrity of the structure. It is achieved through the following technical solutions:

[0006] The first aspect of the present invention provides a method for plugging through cracks in large-volume and large-pore concrete, wherein a straight deep hole and an inclined shallow hole are set at the crack, and an acrylate grouting material and a quick-hardening inorganic grouting material are poured into the straight deep hole in sequence, and an epoxy resin grouting material is poured into the inclined shallow hole.

[0007] The present invention solves the problem of insufficient grout coverage of concrete structural defects by setting straight deep holes and oblique shallow holes at the cracks, and sequentially injecting acrylate grouting material and quick-hardening inorganic grouting material into the straight deep holes and injecting epoxy resin grouting material into the oblique shallow holes for leak plugging. The leak plugging effect is significantly better than that of traditional leak plugging materials and processes. The inventors also conducted performance tests on the leak plugging method of the present invention, and the various performance indicators of the leak plugging method of the present invention exceeded or even far exceeded the industry standard indicator requirements.

[0008] Furthermore, the straight deep holes are drilled at the cracks to 2 / 3 to 1 of the thickness of the concrete structure, and the inclined shallow holes are drilled at 30 to 45 degrees on both sides of the cracks to 1 / 3 to 1 / 2 of the thickness of the concrete structure.

[0009] Furthermore, the diameter of the straight deep hole is 20-28 mm, the straight deep holes are spaced 25-35 cm apart, and the diameter of the oblique shallow hole is 10-14 mm.

[0010] Further, the raw materials of the acrylate grouting material include component A and component B in a mass ratio of (0.9-1.1): (0.35-0.45), wherein component A includes the following raw materials in weight percentage: 10-15% light-burned magnesium oxide, 25-30% acrylic acid, 1-5% magnesium aluminum silicate, 50-60% water and 0.1-0.4% polymerization inhibitor, and component B includes the following raw materials in weight percentage: 20-25% calcium oxide expansion clinker and 75-80% ultrafine slag powder. Preferably, the polymerization inhibitor is hydroquinone. Preferably, the mass ratio of component A to component B is 1:0.4.

[0011] Furthermore, the raw materials of the component A are mixed and then aged, the raw materials of the component B are mixed, and then the mixed components A and B are evenly mixed to obtain the acrylate grouting material.

[0012] Furthermore, the preparation method of component A is aging reaction for 7 to 9 hours. Preferably, the preparation method of component A is aging reaction for 8 hours.

[0013] Acrylate grouting materials made only of acrylic acid and magnesium aluminum silicate have problems such as lack of strength and easy extrusion under pressure. After being modified with lightly burned magnesium oxide, calcium oxide expansion clinker, and ultra-fine slag powder, not only the waterproof performance is significantly improved, but also it has a certain compressive strength and can withstand a certain amount of water pressure. The expansion-type calcium aluminate skeleton compound generated by the reaction of magnesium acrylate gel and slag powder can fill the concrete cracks tightly, and the excess slurry can penetrate into the interlayer to create another waterproof layer.

[0014] Furthermore, the raw materials of the quick-hardening inorganic grouting material include powder and water glass in a mass percentage of 10: (3-8), wherein the powder includes the following raw materials in weight percentage: 55-65% sulphoaluminate cement, 3-10% expansion agent, 2-5% calcium hydroxide, 0.1-0.4% thickener, 5-10% microspheres, 15-25% ultrafine stone powder, 0.005-0.020% foaming agent, and 0.04-0.10% boric acid. Preferably, the expansion agent is a calcium sulphoaluminate expansion agent. Preferably, the thickener is cellulose. Preferably, the foaming agent is azodicarbonamide. Preferably, the sulphoaluminate cement is calcium sulphoaluminate cement.

[0015] Ordinary quick-hardening inorganic grouting materials have poor fluidity and permeability, are prone to water exudation, and the anti-permeability performance after curing cannot meet the use requirements. Through the modification of microspheres, water glass, calcium hydroxide and other materials in this ratio, the fluidity, permeability, integrity and anti-permeability of the slurry have been significantly improved. Microspheres can play the role of rolling and suspension, improving the fluidity and integrity of the slurry, water glass can promote the formation of CSH gel in the slurry, and improve the anti-permeability of the slurry. Calcium hydroxide can improve the viscosity of the slurry and provide a rich calcium source to promote gel formation.

[0016] Furthermore, the raw materials of the epoxy resin grouting material include a resin and a curing agent in a mass percentage of 1: (0.2-0.4);

[0017] The resin is obtained by reacting 60-80% by weight of epoxy resin and 20-40% by weight of toluene diisocyanate polyurethane prepolymer under the action of a catalyst. Preferably, the catalyst is stannous octoate, and its weight percentage is 0.1-0.4% stannous octoate. Furthermore, the reaction temperature is 75-85°C, and the reaction time is 1.2-1.8h. Preferably, the reaction temperature is 80°C, and the reaction time is 1.5 h. Preferably, the toluene diisocyanate polyurethane prepolymer is a polyurethane prepolymer with an isocyanate content of 8.2%.

[0018] Furthermore, the curing agent is prepared by mixing raw materials including m-toluenediamine, cardanol and solid formaldehyde in a mass ratio of 1: (1.1-1.3): (1-1.2), heating and dehydrating.

[0019] Further, the heating temperature is 62-68° C., and the heating time is 0.4-0.6 h. Preferably, the heating temperature is 65° C., and the heating time is 0.5 h.

[0020] Conventional epoxy resin grouting materials have problems such as high brittleness, lack of flexibility, and easy explosion. By modifying the epoxy resin with substances such as polyurethane and cardanol and matching it with a special curing agent, the brittleness and flexibility of the epoxy resin are significantly improved. It also has high water resistance and can withstand long-term water pressure.

[0021] The second aspect of the present invention provides a plugging material used in any of the above methods, including acrylate grouting materials and fast-hardening inorganic grouting materials for filling straight deep holes and epoxy resin grouting materials for filling inclined shallow holes.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] (1) The plugging method of the present invention solves the problem of insufficient slurry coverage of concrete structural defects, achieves all-round filling from the inside to the outside, and ensures the integrity of the structure.

[0024] (2) The fast-hardening inorganic grouting material of the present invention significantly improves the fluidity, permeability, integrity and impermeability of the slurry. The microspheres can play the role of rolling and suspension, improving the fluidity and integrity of the slurry, water glass can promote the formation of CSH gel in the slurry, improving the impermeability of the slurry, and calcium hydroxide can improve the viscosity of the slurry and provide a rich calcium source to promote gel formation.

[0025] (3) The epoxy resin grouting material of the present invention has significantly improved brittleness and flexibility, and has high water resistance and can withstand long-term water pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The invention relates to a punching method. DETAILED DESCRIPTION

[0027] The technical solution of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] The invention provides a method for plugging through cracks in large-volume and large-pore concrete. A straight deep hole and an inclined shallow hole are arranged at the crack, an acrylate grouting material and a quick-hardening inorganic grouting material are sequentially poured into the straight deep hole, and an epoxy resin grouting material is poured into the inclined shallow hole.

[0029] In some examples, the crack is a through crack with a diameter of 1 to 5 mm.

[0030] Punching method Figure 1 The straight deep hole is drilled at 2 / 3 to 1 of the thickness of the concrete structure, the inclined shallow hole is drilled at 1 / 3 to 1 / 2 of the thickness of the concrete structure, and the angle between the inclined shallow hole and the crack is 30 to 45 degrees.

[0031] Acrylate grouting material and quick-hardening inorganic grouting material are sequentially poured into the straight deep hole. The acrylate grouting material is poured until the pressure reaches 0.3 Mpa and the pressure is maintained for 5 minutes. Then, the quick-hardening inorganic grouting material is poured until the pressure reaches 0.5 Mpa and the pressure is maintained for 5 minutes.

[0032] In some examples, at the through crack, a straight deep hole is drilled perpendicular to the concrete structure, the diameter of the straight deep hole is 20-28 mm, and the straight deep holes are spaced 25-35 cm apart, that is, after each straight deep hole is drilled at the through crack, another straight deep hole is drilled 25-35 cm apart until the crack ends. The diameter of the inclined shallow hole is 10-14 mm, and the inclined shallow holes symmetrical on both sides of the straight deep hole are spaced 40-70 cm apart, that is, each straight deep hole corresponds to two inclined shallow holes until the crack ends.

[0033] In some examples, the raw materials of the acrylate grouting material include component A and component B in a mass ratio of (0.9-1.1): (0.35-0.45), wherein component A includes the following raw materials in weight percentage: 10-15% light-burned magnesium oxide, 25-30% acrylic acid, 1-5% magnesium aluminum silicate, 50-60% water, and 0.1-0.4% polymerization inhibitor, and component B includes the following raw materials in weight percentage: 20-25% calcium oxide expansion clinker and 75-80% ultrafine slag powder. The raw materials of component A are mixed and then aged, the raw materials of component B are mixed, and then the mixed components A and B are mixed to obtain the acrylate grouting material.

[0034] In some examples, the preparation method of component A is an aging reaction for 7 to 9 hours.

[0035] In some examples, the raw materials of the fast-hardening inorganic grouting material include powder and water glass in a mass percentage of 10: (3~8), wherein the powder includes the following raw materials in weight percentage: 55~65% sulphoaluminate cement, 3~10% expansion agent, 2~5% calcium hydroxide, 0.1~0.4% thickener, 5~10% microspheres, 15~25% ultrafine stone powder, 0.005~0.020% foaming agent, and 0.04~0.10% boric acid.

[0036] In some examples, the raw materials of the epoxy resin grouting material include a resin and a curing agent in a mass percentage of 1: (0.2-0.4);

[0037] The resin is obtained by reacting 60-80% by weight of epoxy resin and 20-40% by weight of toluene diisocyanate polyurethane prepolymer under the action of a catalyst.

[0038] In some examples, the reaction temperature is 75-85° C., and the reaction time is 1.2-1.8 h.

[0039] In some examples, the curing agent is prepared by mixing raw materials including m-toluenediamine, cardanol and solid formaldehyde in a mass ratio of 1: (1.1-1.3): (1-1.2), heating and dehydrating.

[0040] In some examples, the heating temperature is 62-68° C., and the heating time is 0.4-0.6 h.

[0041] In the following examples and comparative examples, the molecular weight of cellulose is 400, purchased from Shanghai Qishuo Chemical, and the product model is cellulose 400; ordinary acrylate grouting material is purchased from Guangdong Shuanghong Waterproof Insulation Engineering Co., Ltd., the main component is sodium acrylate, and the content is 35%; cement-based fast-hardening inorganic grouting material is purchased from Sino-German Xinya Building Materials Co., Ltd., the product model is CGMXX, and the main component is fast-hardening sulfoaluminum cement; ordinary epoxy resin grouting material is purchased from Shanghai Weiyou Engineering Technology Co., Ltd., the product model is WY-66XX, the main component is bisphenol A epoxy resin, and the content is 90%; sulfoaluminate cement is purchased from Yicheng Anda Special Cement Co., Ltd., the product model is RSAC425, and the main component is calcium sulfoaluminate; calcium sulfoaluminate expansion agent, Purchased from Zhengzhou Jianwen Special Materials Technology Co., Ltd., the product model is HSCA high-performance calcium sulfoaluminate expansion agent; calcium oxide expansion clinker is purchased from Lechang Sanqiang Building Materials Co., Ltd., the product model is HSCA, the main component is active calcium oxide; ultrafine slag powder is purchased from Sichuan Shuangshi Building Materials Co., Ltd., the product model is S105, the main components are active SiO2 and active alumina; microspheres are purchased from Henan Sanxiang Refractory Materials Co., Ltd., the product model is W95, the main component is silicon dioxide; ultrafine stone powder is purchased from Ezhou Tiancaiwang Technology Co., Ltd., the product model is T200, the main component is calcium carbonate; toluene diisocyanate polyurethane prepolymer, a polyurethane prepolymer with an NCO (isocyanate) content of 8.2%, is purchased from Wanhua Chemical Group.

[0042] Example 1

[0043] This embodiment provides a method and material for plugging through cracks in large-volume and large-pore concrete, specifically:

[0044] like Figure 1 As shown, drill φ24mm straight deep holes at the crack to 2 / 3 of the thickness of the concrete structure, and drill φ12mm 40° inclined shallow holes on both sides of the crack to 1 / 3 of the thickness of the concrete structure. The straight deep holes are spaced 30cm apart.

[0045] Acrylate grouting material and quick-hardening inorganic grouting material are poured into the straight deep holes in turn, and epoxy resin grouting material is poured into the inclined shallow holes.

[0046] The raw materials of the acrylate grouting material include component A and component B, which are mixed evenly at a mass ratio of 1:0.4 before grouting;

[0047] Component A includes the following raw materials in weight percentage: 12% light-burned magnesium oxide, 28% acrylic acid, 3% magnesium aluminum silicate, 56.8% water, and 0.2% hydroquinone, which is prepared by aging reaction for 8 hours. Component B includes the following raw materials in weight percentage: 22% calcium oxide expanded clinker and 78% ultrafine slag powder.

[0048] The raw materials of quick-hardening inorganic grouting materials include powder and water glass. Before grouting, mix them evenly with water glass in a mass ratio of 10:5.

[0049] The powder includes the following raw materials in percentage by weight: 60% sulphoaluminate cement, 5% calcium sulphoaluminate expansion agent, 3% calcium hydroxide, 0.2% cellulose, 6.72% micro beads, 25% ultrafine stone powder, 0.01% azodicarbonamide, and 0.07% boric acid.

[0050] The raw materials of epoxy resin grouting materials include resin and curing agent. Before grouting, they are mixed evenly in a mass ratio of 1:0.3.

[0051] The resin is prepared by reacting 70% by weight of E51 epoxy resin and 30% by weight of toluene diisocyanate polyurethane prepolymer at 80°C for 1.5 h under the catalysis of 0.2% by weight of stannous octoate;

[0052] The curing agent is prepared by reacting m-toluenediamine, cardanol and solid formaldehyde at a mass ratio of 1.0:1.2:1.1 at 65°C for 0.5h, and then vacuum dehydrating at 110°C for 2h.

[0053] Example 2

[0054] This embodiment provides a method and material for plugging through cracks in large-volume and large-pore concrete, specifically:

[0055] Drill φ24mm straight deep holes at the cracks to 2 / 3 of the concrete structure thickness, and drill φ12mm 45° inclined shallow holes on both sides of the cracks to 1 / 3 of the concrete structure thickness. The straight deep holes are spaced 30cm apart.

[0056] Acrylate grouting material and quick-hardening inorganic grouting material are poured into the straight deep holes in turn, and epoxy resin grouting material is poured into the inclined shallow holes.

[0057] The raw materials of acrylate grouting materials include component A and component B. Before grouting, they are mixed evenly in a mass ratio of 1:0.4.

[0058] Component A includes the following raw materials in weight percentage: 15% light-burned magnesium oxide, 30% acrylic acid, 1% magnesium aluminum silicate, 53.6% water, and 0.4% hydroquinone, which are prepared by aging reaction for 8 hours. Component B includes the following raw materials in weight percentage: 25% calcium oxide expanded clinker and 75% ultrafine slag powder.

[0059] The raw materials of quick-hardening inorganic grouting materials include powder and water glass, which should be mixed evenly in a mass ratio of 10:8 before grouting.

[0060] The powder includes the following raw materials in percentage by weight: 65% sulphoaluminate cement, 10% calcium sulphoaluminate expansion agent, 4.6% calcium hydroxide, 0.28% cellulose, 5% micro beads, 15% ultrafine stone powder, 0.02% azodicarbonamide, and 0.10% boric acid.

[0061] The raw materials of epoxy resin polyurethane epoxy resin grouting materials include resin and curing agent. Before grouting, they are evenly mixed in a mass ratio of 1:0.4.

[0062] The resin is prepared by reacting 80% by weight of E51 epoxy resin and 20% by weight of toluene diisocyanate polyurethane prepolymer at 80° C. for 1.5 h under the catalysis of 0.4% by weight of stannous octoate.

[0063] The curing agent is prepared by reacting m-toluenediamine, cardanol and solid formaldehyde in a mass ratio of 1.0:1.3:1.2 at 65°C for 0.5 h, and then vacuum dehydrating at 110°C for 2 h.

[0064] Example 3

[0065] This embodiment provides a method and material for plugging through cracks in large-volume and large-pore concrete, specifically:

[0066] Drill φ24mm straight deep holes at the cracks to 2 / 3 of the concrete structure thickness, and drill φ12mm 30° inclined shallow holes on both sides of the cracks to 1 / 3 of the concrete structure thickness. The straight deep holes are spaced 30cm apart.

[0067] Acrylate grouting material and quick-hardening inorganic grouting material are poured into the straight deep holes in turn, and epoxy resin grouting material is poured into the inclined shallow holes.

[0068] The raw materials of the acrylate grouting material include component A and component B, which are mixed evenly at a mass ratio of 1:0.4 before grouting;

[0069] Component A includes the following raw materials in weight percentage: 10% light-burned magnesium oxide, 25% acrylic acid, 2% magnesium aluminum silicate, 62.9% water, and 0.1% hydroquinone, and is prepared by aging reaction for 8 hours. Component B includes the following raw materials in weight percentage: 20% calcium oxide expanded clinker and 80% ultrafine slag powder.

[0070] The raw materials of quick-hardening inorganic grouting materials include powder and water glass. Before grouting, they are evenly mixed in a mass ratio of 10:3.

[0071] The powder includes the following raw materials in percentage by weight: 59.855% sulphoaluminate cement, 3% calcium sulphoaluminate expansion agent, 2% calcium hydroxide, 0.1% cellulose, 10% micro beads, 25% ultrafine stone powder, 0.005% azodicarbonamide, and 0.04% boric acid.

[0072] The raw materials of epoxy resin grouting materials include resin and curing agent. Before grouting, they are evenly mixed in a mass ratio of 1:0.2.

[0073] The resin is prepared by reacting 60% by weight of E51 epoxy resin and 40% by weight of toluene diisocyanate polyurethane prepolymer at 80° C. for 1.5 h under the catalysis of 0.1% by weight of stannous octoate.

[0074] The curing agent is prepared by reacting m-toluenediamine, cardanol and solid formaldehyde in a mass ratio of 1.0:1.1:1.0 at 65°C for 0.5 h, and then vacuum dehydrating at 110°C for 2 h.

[0075] Example 4

[0076] The method and material for plugging through cracks in large-volume and large-pore concrete provided in this embodiment 4 are different from those in embodiment 1 in that ordinary acrylate grouting material and cement-based quick-hardening inorganic grouting material are sequentially poured into the straight deep holes, and ordinary epoxy resin grouting material is poured into the oblique shallow holes.

[0077] Example 5

[0078] The present embodiment provides a method and material for plugging through cracks in large-volume and large-pore concrete. The difference from Embodiment 1 is that the straight deep holes of the present embodiment are sequentially filled with the acrylate grouting material of the present invention and the quick-hardening inorganic grouting material of the present invention, and the oblique shallow holes are filled with ordinary epoxy resin grouting material.

[0079] Comparative Example 1

[0080] This comparative example only adopts the straight deep hole grouting plugging method, and drills a φ24mm straight deep hole at the crack to 2 / 3 of the thickness of the concrete structure. The straight deep holes are 30cm apart, which is basically the same as Example 1, except that no inclined shallow holes are drilled, and only the straight deep hole grouting plugging method is adopted, and the acrylate grouting material of the present invention and the quick-hardening inorganic grouting material of the present invention are poured into the straight deep holes in sequence.

[0081] Comparative Example 2

[0082] This comparative example only adopts the oblique shallow hole grouting plugging method, and a φ12mm 40° oblique shallow hole is drilled at the crack to 1 / 3 of the thickness of the concrete structure. It is basically the same as Example 1, except that no straight deep hole is drilled, and only the oblique shallow hole grouting plugging method is adopted, and the epoxy resin grouting material of the present invention is poured into the oblique shallow hole.

[0083] Comparative Example 3

[0084] The plugging method and materials provided in this comparative example are basically the same as those in Example 1, except that the straight deep holes in this comparative example are sequentially filled with the quick-hardening inorganic grouting material of the present invention and the acrylate grouting material of the present invention, and the oblique shallow holes are filled with the epoxy resin grouting material of the present invention.

[0085] Comparative Example 4

[0086] The plugging method and materials provided in this comparative example are basically the same as those in Example 1, except that the straight deep holes in this comparative example are filled with ordinary acrylate grouting material and the fast-hardening inorganic grouting material of the present invention in sequence, and the oblique shallow holes are filled with the epoxy resin grouting material of the present invention.

[0087] Comparative Example 5

[0088] The plugging method and materials provided in this comparative example are basically the same as those in Example 1, except that ordinary acrylate grouting material and cement-based quick-hardening inorganic grouting material are sequentially poured into the straight deep holes of this comparative example, and the epoxy resin grouting material of the present invention is poured into the oblique shallow holes.

[0089] Application Examples

[0090] The performance tests of the plugging methods provided in the above embodiments and comparative examples were carried out, and the results are shown in Tables 1 and 2.

[0091] In Examples 1-5 of the present invention, various performance indicators exceed or even far exceed the requirements of industry standard indicators. After engineering tests, the leakage recovery time is 13 months or more. In Comparative Example 1, only straight deep hole grouting was used. Since the fine cracks in the concrete structure could not be filled, leakage recovery occurred in 6 months. Comparative Example 2 only used oblique shallow hole grouting. The large cracks in the deeper parts could not be effectively filled, resulting in a shorter leakage recovery time of only 4 months. In Comparative Example 3, when grouting the straight deep hole, the order of the acrylate grouting material of the present invention and the fast-hardening inorganic grouting material was replaced, and the leakage recovery time was shortened to 9 months. Since the acrylate grouting material of the present invention has a strong permeability, the acrylate grouting material of the present invention is first used for grouting, which can quickly penetrate into the deep hole. And a waterproof layer is rebuilt on the water-facing surface, which greatly enhances the waterproof effect. This effect cannot be achieved when the water glass fast-hardening inorganic grouting material with low permeability is used as the first grouting material; after the straight deep hole grouting material of comparative example 4 is replaced by the acrylate grouting material of the present invention with ordinary acrylate grouting material, the compressive strength and permeability coefficient of the solid sand body are significantly reduced, and the leakage recovery time is also shortened to 10 months. Since ordinary acrylates have low strength and low density, they are easily squeezed out due to excessive water pressure, resulting in a shortened leakage recovery time; the straight deep holes of comparative example 5 use ordinary acrylates and ordinary cement-based fast-hardening inorganic grouting materials. Since they are not modified, the density of the large pores and the resistance to extrusion against water pressure are greatly reduced, resulting in a shortened leakage recovery time to 7 months.

[0092] Table 1 Test results of the embodiment

[0093]

[0094] Table 2 Test results of comparative examples

[0095]

[0096] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for plugging through cracks in large-volume and large-pore concrete, characterized in that: A straight deep hole and an inclined shallow hole are arranged at the crack, and an acrylate grouting material and a quick-hardening inorganic grouting material are sequentially poured into the straight deep hole, and an epoxy resin grouting material is poured into the inclined shallow hole.

2. A method for plugging through cracks in large-volume and large-pore concrete according to claim 1, characterized in that: The straight deep holes are drilled at the cracks to 2 / 3 to 1 of the thickness of the concrete structure, and the inclined shallow holes are drilled at 30 to 45 degrees on both sides of the cracks to 1 / 3 to 1 / 2 of the thickness of the concrete structure.

3. A method for plugging through cracks in large-volume and large-pore concrete according to claim 1, characterized in that: The raw materials of the acrylate grouting material include component A and component B in a mass ratio of (0.9-1.1):(0.35-0.45), wherein component A includes the following raw materials in weight percentage: 10-15% light-burned magnesium oxide, 25-30% acrylic acid, 1-5% magnesium aluminum silicate, 50-60% water and 0.1-0.4% inhibitor; component B includes the following raw materials in weight percentage: 20-25% calcium oxide expansion clinker and 75-80% ultrafine slag powder.

4. A method for plugging through cracks in large-volume and large-pore concrete according to claim 3, characterized in that: The raw materials of the component A are mixed and then aged, the raw materials of the component B are mixed, and then the mixed components A and B are evenly mixed to obtain the acrylate grouting material.

5. A method for plugging through cracks in large-volume and large-pore concrete according to claim 1, characterized in that: The raw materials of the fast-hardening inorganic grouting material include powder and water glass in a mass percentage of 10: (3-8), wherein the powder includes the following raw materials in weight percentage: 55-65% sulphoaluminate cement, 3-10% expansion agent, 2-5% calcium hydroxide, 0.1-0.4% thickener, 5-10% microspheres, 15-25% ultrafine stone powder, 0.005-0.020% foaming agent, and 0.04-0.10% boric acid.

6. A method for plugging through cracks in large-volume and large-pore concrete according to claim 1, characterized in that: The raw materials of the epoxy resin grouting material include a resin and a curing agent in a mass percentage of 1: (0.2-0.4); The resin is obtained by reacting 60-80% by weight of epoxy resin and 20-40% by weight of toluene diisocyanate polyurethane prepolymer under the action of a catalyst.

7. A method for plugging through cracks in large-volume and large-pore concrete according to claim 6, characterized in that: The reaction temperature is 75-85° C., and the reaction time is 1.2-1.8 h.

8. A method for plugging through cracks in large-volume and large-pore concrete according to claim 6, characterized in that: The curing agent is prepared by mixing raw materials including meta-toluenediamine, cardanol and solid formaldehyde in a mass ratio of 1: (1.1-1.3): (1-1.2), heating and dehydrating.

9. A method for plugging through cracks in large-volume and large-pore concrete according to claim 8, characterized in that: The heating temperature is 62-68° C., and the heating time is 0.4-0.6 h.

10. The plugging material used in the method according to any one of claims 1 to 9, characterized in that: It includes acrylate grouting materials and fast-hardening inorganic grouting materials for filling straight deep holes, and epoxy resin grouting materials for filling inclined shallow holes.

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