RU2473745C1 - Method to eliminate water leakages in underground engineering utilities - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: method to eliminate water leaks in underground engineering utilities includes drilling of boreholes and injection of a strengthening hydraulic insulation composition into them. The strengthening hydraulic insulation composition is injected into previously drilled boreholes by means of separate supply of the following into the mixing nozzle under pressure of 0.2-1 MPa: a cement-water suspension with W/C=1-1.5 and liquid glass with density of 1.3-1.6 g/cm³ at the following ratio of specified mixtures accordingly, wt %: 75-90 and 10-25.

EFFECT: simplified technology of water leaks elimination in a defect hydraulically insulated zone of underground engineering utilities.

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Description

The invention relates to the field of construction and can be used to eliminate water leaks in the underground parts of buildings and structures, tunnels, collectors, water conduits, foundations, subway structures, etc., especially in emergency situations.

A known method of waterproofing the lining of tunnels, which includes sealing the end of the gap between the lining and development, forcing the waterproofing solution into the space between the development and lining through the holes in the lining. In this case, the end part of the gap between the lining and the production is sealed with a thrust ring with a sealing pneumatic tire, and a waterproofing solution is pumped through the holes in the lining with a hydraulic booster under a pressure of 2.0-2.5 MPa (RU 2120553 from 04/09/1997, MKP E21D 11/38).

It is known to use a mixture for waterproofing and monolithic tunnel lining, which includes non-additive Portland cement with an activity of at least 25.0 MPa after 1 day, an expanding sulfoaluminate component - a mixture of CaO: Al ₂ O ₃ : SO ₃ in a molar ratio (3.1-3, 5) :( 0.9-1.2) :( 2.2-2.6), a finely divided cellulose fiber with a fiber length of 0.03-1.0 mm, a copolymer of vinyl acetate and vinyl versatate, tartaric acid or its soluble salts and silica sand with a particle size of 0.1-2.5 mm in the following ratio of components, wt.%: the specified Portland cement 45-50, the indicated mixture CaO: Al ₂ O ₃ : SO ₃ 2.5-3.5, tartaric acid or its soluble salts 0.010-0.025, the specified copolymer 0.2-0.5, the specified cellulose fiber 0.1-0.2, the specified quartz sand - the rest (RU 2385303 dated 05/27/2008, MKP E21D 11/10).

A known method of injection compaction of concrete and reinforced concrete structures and grouting mortars for its implementation. According to this method, the injection of the solution is carried out into the depths of the structures through groups of point injectors fixed in the pre-drilled wells of the structure and hydraulically connected to each other within the condensed part, in three successive stages of injection, with intervals between stages equal to the curing time of the previously injected solution moreover, in the first and second stages use a grouting mortar of the same composition, but with a different water-cement ratio, containing Portland ment, silica fume, surfactant, silica sand fractions of less than 0.140 mm and (0.140-0.315) mm and additionally a complex mineral additive - a product of co-grinding aluminate cement of the "500" grade with a content of tricalcium aluminate 12-15% by weight of cement, calcium sulfoaluminate and quartz sand fractions not higher than 0.140 mm, in a ratio of 1: 1: 1. At the final stage of injection, grouting mortar containing Portland cement, silica sand fractions of less than 0.140 mm, silica fume with specific surface area (25-35) · 10 ³ cm ² / g, surfactant, ground quartz sand with specific surface area (3.5-4, 5) · 10 ³ cm ² / g and additionally specified complex mineral supplement. The method is carried out for each stage of injection of mixtures in a certain sequence. After performing the operations of the final stage, the injectors are removed from the wells, and the wells are shut off by filling their volume with a concrete mixture of the composition, wt.%: Portland cement of the “500” grade 35.5-40.5; silica fume 1.5-3.5; ground quartz sand 7.5-9.5; quartz sand fractions (0.140-0.315) mm 43.5-54.0; the specified complex mineral additive 4,5-5,5; water - the rest, after which all stages of compaction are performed for the group of injectors of the next stage. If necessary, after injection work, a protective-finish coating of the structure is applied by spraying concrete mixture or plaster mortar onto its surface (RU 2067649 dated 04/05/1995, MKP E21D 19/02).

The prototype of the proposed solution is a method for eliminating the defective areas of the lining of hydraulic pressure structures, which consists in injecting the waterproofing compound into pre-drilled holes and injecting hardening reinforcing waterproofing compositions. The injection operation is carried out in two stages: the first is performed with a composition containing acetone formaldehyde resin, a 35% aqueous solution of caustic soda, hydroxyl-containing oligoether-laprol-3503-2-70 and water, taken in the ratio, wt.%: Acetone formaldehyde resin 15.0 -20.0, 35% aqueous solution of caustic soda 1.5-2.0, hydroxyl-containing oligoester 1.0-2.0, water - the rest, then after 5-300 minutes they are injected with a composition containing acetone formaldehyde resin, 35% aqueous solution of caustic soda, sulphite-yeast mash, concrete clay and water in the ratio, m S.%: acetone-formaldehyde resin 15.0-20.0, 35% aqueous solution of caustic soda 1.5-2.0, sulfite-yeast mash 0.1-0.2, bentonite clay 6.0-8, 0, water - the rest (RU 2009325 from 09.10.1990, manual gearbox E21D 11/00).

The disadvantage of this method is its multi-stage, as well as the duration of the curing of the injectable composition.

The technical task of this invention is to simplify the technology for eliminating water leaks in a defective waterproofing zone of underground engineering structures.

The solution of the technical problem is achieved by the fact that in the proposed method for eliminating water leaks, a reinforcing waterproofing composition is injected into pre-drilled holes by means of a separate supply of a cement-water suspension with W / C = 1-1.5 to a mixing nozzle with a pressure of 0.2-1 MPa and liquid glass with a density of 1.3-1.6 g / cm ³ in the following ratio of these mixtures, respectively, wt.%: 75-90 and 10-25.

An example of the method. In a container with a volume of 200-250 l with constant stirring at a speed of 200-250 rpm (in order to prevent sedimentation), a cement-water suspension with W / C = 1-1.5 is prepared.

In the second tank with a volume of 200-250 l pour liquid glass with a density of 1.3-1.6 g / cm ³ . Both tanks are equipped with pumps with adjustable feed rates of cement-water slurry and liquid glass through separate hoses connected by a fitting. Mixing of the components takes place in a fitting mounted in a pre-prepared hole in a waterproofing zone. Depending on the degree of accident, the ratio of the components and the pressure of their supply are changed in accordance with the data in Table 1.

The technical characteristics of the waterproofing and reinforcing building structures composition are presented in table 1.

No. Characteristics Ratio of components Time min Strength, MPa Water absorption,% one The curing time of the waterproofing composition, depending on the ratio of components (cement-water suspension: water glass), wt.% 90:10 5-8 85:15 4-6 75:25 1,5-3 2 Compressive strength after 45 min 90:10 6.0 85:15 12.0 75:25 18.5 3 Water absorption of polymerized compositions,% 90:10 0,0 85:15 0,0 75:25 0,0 four Adhesive strength to
concrete surfaces of polymerized compositions after 45 min 90:10
85:15
75:25 1,5
3,7
4,5 5 Groundwater gelation time depending on the ratio of injected components * 90:10 7-12 85:15 6-8 75:25 2.5-4 Note: all water located in the waterproofing defective zone turns into a jelly-like state in contact with the waterproofing composition, acquires water-repellent properties, additionally ensuring the complete waterproofness of the waterproofing zone.

Claims (1)

A method for eliminating water leaks in underground engineering structures, including drilling holes and injecting a reinforcing waterproofing composition into them, characterized in that the reinforcing waterproofing composition is injected into pre-drilled holes by separately supplying a cement-water suspension to a mixing nozzle under a pressure of 0.2-1 MPa with W / C = 1-1.5 and liquid glass with a density of 1.3-1.6 g / cm ³ with the following ratio of these mixtures, respectively, wt.%: 75-90 and 10-25.