RU2612419C2 - Method for repairing concrete facing of irrigation channels - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: method comprises removing the defective portion of the coating, applying the concrete 3 with a layer thickness δ= 0.05 m, and laying the polymeric profiled geomembrane 4 on the concrete, with rigid ribs down. The concrete 3 is applied along the damage contour 2 on each of its sides to a pre-wetted surface. In presence of serious damage with the width b_surf≥1.5 m, a polymer geomesh is laid on the concrete 3 layer. The width of the geomembrane 4 strip is determined depending on the concrete facing 1 damage 2 size, considering the stock.

EFFECT: use of the polymer profiled geomembrane and the geomesh for repairing the damaged concrete facings of irrigation channels will significantly extend the service life of the structures by 30-40 years, to reduce water losses through seepage, as well as to abandon large amounts of concrete work.

2 cl, 2 dwg

Description

The invention relates to irrigation and drainage construction and can be used when repairing concrete linings of long-term irrigation canals using geosynthetics.

There are various methods for repairing concrete coatings (cladding) and expansion joints (see, for example, “Repair Guide for Concrete and Reinforced Concrete Structures of Water Transport, Moscow, 2006 - 36 pp. [Electronic resource]. - Access mode: http: / /emaco-spb.ru/d/49220/d/rukovodstvo_giprorechtrans_po_remontu_betonnyh_i_zhelezob etonnyh_sooruzheniy_vodnogo_transporta_specialnymi_betonami.pdf), including filling damage with various cementitious mortars and cementitious mortars and concrete and cementitious mortars and concrete their mixtures (including swelling based on bentonite), repair with thiol and silicone sealants and many other measures aimed at increasing the service life and waterproofness of the concrete coating.

It should be noted that each of the presented methods for repairing damage to concrete cladding has its certain disadvantages. Thus, repair layers made of concrete and suspensions based on polymers are short-lived, and thiol and silicone sealants can only repair damage in the form of minor damage. Moreover, many dry mixes and sealants must be applied only on a dry surface at temperatures above + 10 ° C, hence the main drawback is the “attachment” of the repair mode to weather and other conditions. Moreover, repairing large damages with the materials and methods presented will be a rather expensive undertaking, not capable of providing increased durability, water resistance and low surface roughness, which is especially important for lined irrigation canals.

A known method of repairing concrete or reinforced concrete coatings of roads, bridges and airfields (patent RU 2148690, publ. 05/10/2000), including layer-by-layer horizontal removal of a defective coating area, removal of coating destruction products, application of a binder material with the formation of an adhesive layer, filling the defective place with building material , its leveling and flooding surface with fibers in a freshly laid mixture and the device of the load.

The disadvantage of this method is the length of time for repairing concrete coatings, low quality indicators and the inability to repair concrete facings of irrigation canals. In addition, building material brought into a defective place will be destroyed by subsidence and exposure to water.

A known method of repairing concrete cladding on subsiding soils (see SU, copyright 1477819, publ. 05/07/1989), including filling the hardening plastic composition by injection through the holes in the plates of the space between the cladding plates and the film screen laid under them above the ground, and before filling the subfloor space with a hardening plastic composition, a water-repellent mixture is injected into it in the form of an advective cloud.

The disadvantage of this method is the need for injection into the underfloor space of the water-repellent mixture in the form of an advective cloud, which greatly complicates the work, especially in the presence of a large number of damage. In addition, when carrying out injection work, the cladding is not completely waterproof, and the injection composition in cracks, seams and holes during the operation of irrigation canals can be destroyed and carried out with water. Injecting large injuries is an expensive undertaking, and filling cracks with plastic compounds will lead to the formation of subsidence cracks with the subsequent destruction of the repair material.

The closest technical solution is a method of repairing concrete and reinforced concrete coatings and structures (patent RU 2212487, publ. 09/20/2003), including the removal of a defective coating area, heating it to a temperature of 80-120 ° C to a depth of at least 20 mm and filling this area pre-heated building material (to a temperature of 120-180 ° C) - a mixture of sulfur binders and mineral filler.

The main disadvantage of the presented technical solution is the complexity of the repair of concrete and reinforced concrete structures, which consists not only in heating the building material, but also in heating the defective coating area to a temperature of 80-120 ° C. All these works, of course, lead to an increase in the cost of damage repair technology, despite the fact that after carrying out repairs by this method, the structure can be operated in 1.5 hours.

The technical result to which the claimed invention is directed is to increase the service life and water resistance of the damage, as well as to ensure the smallest roughness of the repaired section of the concrete lining.

The technical result is achieved due to the fact that along the contour of damage on each of its sides, concrete with a layer thickness of δ = 0.05 m is applied to a pre-moistened surface, onto which polymer profiled geomembrane is laid with hard edges down, and in the presence of large damage with a width of b _dressings ≥1,5 m concrete layer is further deposited polymeric geogrids. The width of the strip of the geomembrane (b _{half gm} ) is determined depending on the size of the damage to the concrete lining, taking into account the margin according to the formula: b _{half gm} = b _pov + 2b _vir + 2b _zap , m, where b _pov is the width of the damage, m; b _def is the width of the deformation region, m; b _zap - margin width on each side is adopted as b _zap ≥0,15 m the presence of small lesions width b _dressings ≤1,5 m; b _zap ≥0,30 m the presence of large lesions width b _dressings ≥1,5 m.

The invention is illustrated by the following drawings: FIG. 1 is a diagram of the repair of concrete cladding with a geomembrane; FIG. 2 is a diagram of the repair of concrete cladding with a geomembrane and geogrid.

The numbers in the drawings indicate:

1 - concrete lining of the channel; 2 - damage to the concrete lining; 3 - concrete; 4 - profiled geomembrane; 5 - polymer geogrid.

During the operation of irrigation canals made in concrete cladding, under the influence of various factors, the concrete wears out, ages, and, as a result, various damage forms. To restore solidity and bearing capacity, to ensure water tightness, concrete claddings, on which various damage has occurred, are subject to repair and restoration. The list of works on repair of waterproof concrete linings of irrigation canals depends on the type and size of damage, operating conditions and many other factors. If damage is found on the concrete lining, for starters it is necessary to empty the area of the irrigation canal where repairs will be carried out. For seasonally-operating irrigation canals, repair work is recommended in the autumn-winter period.

A method of repairing concrete lining of irrigation canals is as follows (Fig. 1, 2).

If damage is detected on the concrete lining 1 of the irrigation canal, first remove the defective coating area, which consists in cleaning and removing dirt, sludge, large and sharp inclusions near the site of damage 2. Next along the damage circuit 2 (on each of its sides with a margin equal to, respectively, b _zap ≥0,15 m) at pre-moistened surface applied concrete layer 3 with a thickness δ = 0,05 m, which is laid down polymeric rigid ribs profiled geomembrane 4. When solidification occurs concrete 3 samoproizvo noe geomembrane rigid fastening ribs to concrete, thus ensuring waterproofness snizhet damage and its roughness.

In the presence of large damages on the concrete facing channels (with width b damage _dressing ≥1,5 m), there is significant pressure on the structure as well as in those areas where there are subsidence processes of the concrete layer 3 is laid polymeric geogrids 5 over which operate sealing damage with a polymer profiled geomembrane with 4 rigid ribs down onto freshly laid concrete 3. The use of an additional layer of a polymer geogrid to repair large damage on concrete channel linings helps to reduce Adok and deflections of the polymer geomembrane. In the presence of large damages to the width b ≥1,5 m _dressings for secure fastening to the concrete geomembrane margin width on each side of the geomembrane must be taken _zap b ≥0,30 m.

The width of the strip of polymer profiled geomembrane (b _{half gm} ) is determined depending on the size of damage to the concrete lining, taking into account the margin according to the formula: b _{half gm} = b _half + 2b _vir + 2b _zap , m, where b _{half gm} is the width of the damage, m; b _def is the width of the deformation region, m; b _zap - margin width on each side is adopted as b _zap ≥0,15 m the presence of small lesions b _dressings ≤1,5 m; b _zap ≥0,30 m if there is major damage b _Stand ≥1,5 m.

If it is impossible to lay a concrete layer 3 under the profiled geomembrane, smooth polymeric low-pressure, high-density geomembrane (HDPE) can be applied to the concrete surface using metal anchors.

The application of the developed method will allow quickly and effectively to repair various damages on the concrete lining of irrigation canals. Thanks to the use of polymer geomembranes, the roughness of the concrete cladding will be significantly reduced (especially in damaged areas), which will increase the throughput of the irrigation system as a whole.

The use of polymer profiled geomembrane and geogrid for repairing damage to concrete lining of irrigation canals will significantly extend the service life of structures by 30-40 years, reduce water loss for filtration, and also abandon large volumes of concrete work.

Claims (2)

1. A method of repairing concrete linings of irrigation canals, including the removal of a defective coating area, characterized in that concrete with a layer thickness of δ = 0.05 m is applied to a pre-moistened surface along the damage contour from each side of it, onto which polymer is laid with hard ribs down profiled geomembrane, and the presence of major damage to the width b _dressings ≥1,5 m concrete layer is further deposited polymeric geogrids. 2. The method according to claim 1, characterized in that the width of the strip of the geomembrane is determined depending on the size of the damage to the concrete lining, taking into account the margin according to the formula: b _pol.gm = b _pov + 2b _dev + 2b _app , m, where b _pov - damage width, m; _def b - the width of the deformation, m; b _zap - margin width on each side is adopted as b _zap ≥0,15 m the presence of small lesions b _dressings ≤1,5 m; b _zap ≥0,30 m if there is major damage b _Stand ≥1,5 m.

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