CN110952996B - Method and material for reinforcing electric power tunnel by fiber grid reinforced polymer mortar - Google Patents
Method and material for reinforcing electric power tunnel by fiber grid reinforced polymer mortar Download PDFInfo
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- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 92
- 239000000835 fiber Substances 0.000 title claims abstract description 54
- 229920000642 polymer Polymers 0.000 title claims abstract description 54
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000000463 material Substances 0.000 title abstract description 7
- 239000004568 cement Substances 0.000 claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000003365 glass fiber Substances 0.000 claims abstract description 18
- 239000003513 alkali Substances 0.000 claims abstract description 15
- 230000002787 reinforcement Effects 0.000 claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 12
- 239000011248 coating agent Substances 0.000 claims abstract description 12
- 238000000576 coating method Methods 0.000 claims abstract description 12
- 239000010959 steel Substances 0.000 claims abstract description 12
- 239000004567 concrete Substances 0.000 claims abstract description 11
- 239000004576 sand Substances 0.000 claims abstract description 11
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 9
- 229920002472 Starch Polymers 0.000 claims abstract description 9
- 229920003086 cellulose ether Polymers 0.000 claims abstract description 9
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 9
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 9
- 239000008107 starch Substances 0.000 claims abstract description 9
- 235000019698 starch Nutrition 0.000 claims abstract description 9
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 5
- 239000003755 preservative agent Substances 0.000 claims abstract description 3
- 230000002335 preservative effect Effects 0.000 claims abstract description 3
- 239000002994 raw material Substances 0.000 claims abstract description 3
- 229920002748 Basalt fiber Polymers 0.000 claims description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 14
- 238000007689 inspection Methods 0.000 claims description 11
- 239000000839 emulsion Substances 0.000 claims description 8
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 7
- 230000002457 bidirectional effect Effects 0.000 claims description 7
- 239000004917 carbon fiber Substances 0.000 claims description 7
- 239000011150 reinforced concrete Substances 0.000 claims description 7
- 230000008439 repair process Effects 0.000 claims description 7
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 claims description 6
- 229910052918 calcium silicate Inorganic materials 0.000 claims description 6
- 235000012241 calcium silicate Nutrition 0.000 claims description 6
- 230000007797 corrosion Effects 0.000 claims description 6
- 238000005260 corrosion Methods 0.000 claims description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 239000011398 Portland cement Substances 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 5
- 229920002689 polyvinyl acetate Polymers 0.000 claims description 5
- 239000011118 polyvinyl acetate Substances 0.000 claims description 5
- 239000004743 Polypropylene Substances 0.000 claims description 4
- 239000006004 Quartz sand Substances 0.000 claims description 4
- 239000003822 epoxy resin Substances 0.000 claims description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 4
- 229920000647 polyepoxide Polymers 0.000 claims description 4
- -1 polypropylene Polymers 0.000 claims description 4
- 229920001155 polypropylene Polymers 0.000 claims description 4
- 238000002203 pretreatment Methods 0.000 claims description 4
- 238000009941 weaving Methods 0.000 claims description 3
- 229920006231 aramid fiber Polymers 0.000 claims description 2
- 239000002585 base Substances 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 claims description 2
- 229920001688 coating polymer Polymers 0.000 claims description 2
- 238000013461 design Methods 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 239000002131 composite material Substances 0.000 abstract description 2
- 239000011210 fiber-reinforced concrete Substances 0.000 abstract 1
- 238000007781 pre-processing Methods 0.000 abstract 1
- 239000012783 reinforcing fiber Substances 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 23
- 239000004593 Epoxy Substances 0.000 description 4
- 238000005452 bending Methods 0.000 description 4
- 239000011449 brick Substances 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000011241 protective layer Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 230000003487 anti-permeability effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
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- 238000011065 in-situ storage Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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- 239000012466 permeate Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Ceramic Engineering (AREA)
- Architecture (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Lining And Supports For Tunnels (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
A method and a material for reinforcing an electric power tunnel by fiber grid reinforced polymer mortar belong to the technical field of reinforcing fiber grid reinforced cement-based composite materials. The raw material components comprise: cement, polymer, polyvinyl alcohol fiber, alkali-resistant glass fiber, sand, water, a water reducing agent, starch ether, cellulose ether and the like. Pre-repairing cracks of the masonry or concrete tunnel wall by using the polymer mortar, such as filling, plugging and the like, so that the mortar is embedded into the cracks; coating the rusted steel bar surface with a steel bar preservative, and then coating an interface agent on the tunnel wall one to two times; and then, using a plurality of layers of fiber grid reinforced polymer mortar to structurally reinforce the tunnel and the well wall. In order to improve the seismic integrity, 1-3 fiber reinforced concrete ring beams are arranged; preprocessing is carried out firstly, and then reinforcement is carried out.
Description
Technical Field
The invention relates to a method and a material for reinforcing an electric power tunnel by fiber grid reinforced polymer mortar, belongs to the technical field of reinforcement of fiber grid reinforced cement-based composite materials, and is mainly used for quickly repairing and reinforcing the electric power tunnel.
Technical Field
In recent years, with the rapid development of urbanization and urban communities in China, electric power tunnels and the like are increasing day by day. Underground pipelines such as power tunnels, drainage pipelines and the like are aged or seriously damaged due to the increase of service time, so that the normal use of the pipelines and power supply is endangered, and the repair of the pipelines is increasingly important. The tunnel wall and the inspection well are used as important components of an underground pipeline, and are influenced by multiple adverse factors such as road traffic load, underground soil pressure, rainwater, water seepage and the like for a long time, so that serious problems such as seepage, concrete wall damage, concrete protective layer falling off, steel bar corrosion, masonry dislocation, cracking deformation and the like occur. Once the tunnel wall and the inspection well are damaged, the normal use of the pipeline is seriously influenced, and the inspection and maintenance work of the pipeline is also influenced. Therefore, the development of novel methods and materials for rapidly repairing and reinforcing tunnel walls and inspection wells is urgently needed.
In the past, the reinforcing mesh and the steel strand have the serious problem that the reinforcing steel bars are easy to rust and corrode. In the existing reinforcing method for sticking the fiber cloth, the stuck fiber cloth is easy to fall off due to the fact that the tunnel is in a humid environment all the year round, and the reinforcing is completely ineffective.
In order to meet the requirements of electric tunnels and well walls on repair technologies and materials, a process and a material preparation technology for reinforcing and repairing the tunnel walls by using fiber mesh reinforced polymer mortar are developed through tests and outdoor verification.
The adoption of the fiber grid reinforced polymer mortar for reinforcing the electric power tunnel has remarkable advantages. The fiber mesh has the obvious advantages of corrosion resistance, light weight, high strength, high durability, convenient reinforcing construction and the like, and the strength of the fiber mesh is 5-10 times that of a common reinforcing steel bar. The polymer mortar permeates among the fiber yarns of the fiber grids, and the mortar is embedded into the holes of the fiber grids, so that a stressed whole is formed, and the polymer mortar can jointly bear the load in multiple directions. The thickness of the polymer mortar is 10-15mm, and the polymer mortar has little influence on the original structure size. The fiber grid reinforcement has the double functions of durability repair and mechanical property enhancement, and the impermeability and the corrosion resistance are improved, the durability is improved, and meanwhile, the stress performance of the tunnel is obviously improved. And the construction period is shortened by 30 percent compared with the prior method, and the cost is reduced by 30 to 40 percent.
Disclosure of Invention
A fiber grid reinforced short fiber polymer mortar for repairing and reinforcing an electric power tunnel is characterized in that: the raw material components comprise: cement, polymer, polyvinyl alcohol fiber, alkali-resistant glass fiber, sand, water, a water reducing agent, starch ether, cellulose ether and the like;
wherein the cement is selected from high belite sulphoaluminate cement and portland cement, and for reinforcement projects needing quick setting (24h, the compressive strength is more than 45MPa), the high belite sulphoaluminate cement is adopted, and the cement accounts for 11-17% of the total mass of the mortar; for the common engineering, Portland cement is adopted, and accounts for 21-27% of the total mass of the mortar; the cement is further selected from BS-HFR42.5, BS-HFR52.5, PII 42.5 and PII 52.5.
The polymer is selected from waterborne epoxy resin, polyvinyl acetate or polypropylene emulsion. For reinforcement with high strength requirement (28d, the compressive strength is more than 75MPa), the polymer in the mortar adopts water-based epoxy resin, and the using amount of the polymer is 3-7% of the mass of the cement; for mortar with general strength requirement, polyvinyl acetate or polypropylene emulsion is used as the polymer, and the polymer accounts for 9-20% of the total mass of the mortar.
The length of the polyvinyl alcohol fiber is 12-15mm, the diameter is 40-55 μm, the strength is 1700MPa, and the mass mixing amount accounts for 0.4-0.6% of the mass of the mortar.
The length of the alkali-resistant glass fiber is 10-18mm, the diameter is 40-80 μm, the tensile strength is 1800MPa, and the mass mixing amount accounts for 0.4-0.9% of the mass of the mortar.
The water-cement ratio is 0.32-0.51.
The mass of the polycarboxylic acid water reducing agent is 0.1-0.2% of that of the cement.
Starch ether, cellulose ether and the like are all 0.01-0.02 percent of the mass of the cement.
The sand accounts for 21-36% of the mortar by mass, is washed river sand or quartz sand, and has a fineness modulus of 2.2-2.7.
The method for reinforcing the electric power tunnel by adopting the mortar is characterized by comprising the following pretreatment methods and steps:
(1) the pretreatment method comprises the steps of performing pre-repair such as filling, plugging and the like on cracks of the masonry or the concrete tunnel wall by using the polymer mortar, and embedding the mortar into the cracks; coating the rusted steel bar surface with a steel bar preservative, and then coating an interface agent on the tunnel wall one to two times;
(2) and (3) reinforcing, namely reinforcing and repairing the tunnel wall and the wall upper cover plate on the basis of the pretreatment: firstly, coating a layer of 5-7mm of polymer mortar, attaching a fiber grid to the obtained mortar base layer, coating 2-3mm of polymer mortar on the fiber grid, attaching 1 layer of fiber grid, and coating polymer mortar on the fiber grid; by analogy, the number of layers of the fiber grids is adhered until the number of layers reaches the design requirement; the mortar of other layers except the first layer is gradually thickened, and the thickness of the mortar of the last layer is 4-6 mm.
And simultaneously, the inspection well wall which needs to be reinforced is subjected to seismic reinforcement, ring beams are adopted at the upper part and the middle part of the inner surface of the inspection well wall for reinforcement, and carbon fiber ribs, glass fiber ribs, basalt fiber ribs and the like can be adopted as fiber ribs in the ring beams. The ring beam is as follows: longitudinal bars and stirrups are adopted and the polymer mortar is used for pouring.
The longitudinal ribs of 4 phi 12 or 4 phi 18 fibers can be matched. The hooping adopts a fiber rib with phi 6@150 or phi 6@ 200. The ring beam is shown in figures 1-3 and is cast in situ by adopting polymer mortar.
The inspection well wall is reinforced, and can be a round well wall or a rectangular well wall; the original well wall can be a masonry or reinforced concrete structure. The reinforcement is schematically shown in fig. 4.
The fiber grids can adopt carbon fiber grids, aramid fiber grids, alkali-resistant glass fiber grids, basalt fiber grids and the like, and can be bidirectional or unidirectional; hybrid weaving can be adopted, such as hybrid weaving of carbon fibers and glass fibers, hybrid pasting of a layer of carbon fiber grids and a layer of basalt fiber grids, and the like.
The pretreatment method in the step (1) is pretreatment before reinforcing the electric power tunnel, and further preferably, rust removal treatment is carried out on corroded steel bars, repair pretreatment such as filling, plugging and the like is carried out on polymer mortar for brickwork and concrete cracks, and surface cleaning, interface agent coating pretreatment and the like are carried out on the wall of the tunnel well;
for the point damage with leakage and good structure, polymer mortar is adopted for leaking stoppage, sealing and the like; for the tunnel with serious leakage and structural damage, plugging and filling the cavity with waterproof polymer mortar, and then performing the step (2) of the invention: carrying out structural reinforcement, waterproof treatment and anticorrosion treatment on the tunnel and the well wall by using the fiber grid reinforced polymer mortar; and 3-6 layers of fiber mesh reinforced polymer mortar are adopted for reinforcing and repairing the tunnel with serious structural damage.
The invention has the following beneficial effects:
1. the rusted reinforced concrete slab is repaired, the original cracks are completely sealed, the crack resistance bearing capacity and the ultimate bearing capacity of the slab are respectively improved by 26% and 49%, and the initial crack deformation capacity and the ultimate deformation capacity of the slab are respectively improved by 35% and 74%.
2. The masonry tunnel wall is repaired and reinforced, and 3-4 layers of basalt fiber grids are used for reinforcing the masonry, so that the shear resistance bearing capacity is improved by 24-71%, the earthquake resistance bearing capacity is improved by 45-81%, the earthquake resistance energy consumption capacity is improved by 121-193%, and the ductility coefficient is improved by 43-97%.
3. The reinforced concrete wall is repaired and reinforced, so that the impermeability is improved by 43.9-64.1%, the compressive bearing capacity is improved by 29-32%, the bending bearing capacity is improved by 44-91%, and the shear bearing capacity is improved by 21-69%.
4. The reinforced concrete wall and cover plate are repaired and reinforced, so that the corrosion resistance life of the reinforced concrete wall and cover plate in a humid environment is prolonged by 26-38 years.
5. The masonry wall structure is repaired, and the anti-permeability of the wall structure is improved by 86.7 to 94.9 percent.
6. The shear bonding strength of the polymer mortar and the masonry is 2.4-5.8 MPa.
7. The polymer mortar has 24-hour compressive strength of 31-60MPa and breaking strength of 5.2-7.4 MPa.
8. The 28d compressive strength, the breaking strength and the bending toughness of the fiber reinforced polymer mortar are respectively 49-88MPa, 11.4-16.2MPa and f0.5Is 3.9-4.9MPa, f1.01.5-3.1MPa, T20Is 16.6-29.1 joules.
9. The ultimate tensile strain of the fiber reinforced polymer mortar is 3.9-4.1 times that of the common mortar, and the fracture energy is improved by 2.9-4.3 times.
Drawings
FIG. 1 is a schematic view of an inspection well wall reinforcing structure;
FIG. 2 is a cross-sectional view of FIG. 1;
FIG. 3 is a schematic view of polymer mortar casting using longitudinal bars and stirrups;
fig. 4 is a schematic view of reinforcement.
Detailed Description
The present invention will be further illustrated by the following examples, but the present invention is not limited to the following examples.
Example 1.
The original inspection well wall is of a masonry structure, and brick staggered joints and local cracks are 2-4 cm. And reinforcing the basalt fiber mesh by using polymer mortar. The polymer mortar comprises the following components: portland cement, polyvinyl acetate emulsion, polyvinyl alcohol fiber, alkali-resistant glass fiber, sand, water, a water reducing agent, starch ether, cellulose ether and the like. P.II 52.5 cement accounts for 22% of the total mass of the mortar; the mass of the polyacetic acid emulsion accounts for 11 percent of the total mass of the mortar; the length of the polyvinyl alcohol fiber is 12-15mm, the diameter is 40-55 μm, the strength is 1700MPa, and the mass mixing amount is 0.4%; simultaneously, the length of the alkali-resistant glass fiber is 10-18mm, the diameter is 40-80 μm, the tensile strength is 1800MPa, and the mass doping amount is 0.5%; water-cement ratio 0.44; the mass of the polycarboxylic acid water reducing agent is 0.15 percent of that of the cement. Starch ether, cellulose ether and the like are all 0.01 percent of the mass of the cement. The sand accounts for 31 percent of the mass of the mortar, is quartz sand and has the fineness modulus of 2.85. The reinforcing process comprises the following steps: filling cracks of the bricks with the mortar, then smearing the mortar with the thickness of 7mm on the wall of the old brick masonry well in all well depth directions, pasting a layer of bidirectional basalt fiber grids, wherein the hole pitch of the basalt fiber is 5mm, and the tensile force per linear meter of the fiber grids in the directions of 2 longitude and latitude is 72 kN; smearing 2mm of mortar, pasting a basalt fiber grid layer (the size and the performance of the grid are the same as those of the first layer), and smearing 3mm of mortar; then a layer of bidirectional basalt fiber grid (the size and the performance of the grid are the same as those of the first layer and the second layer) is pasted, and then 6mm mortar is smeared. The basalt fiber rib ring beam is arranged in the middle of the well wall, the cross section of the ring beam is 100 x 100mm, the longitudinal ribs are 4 basalt fiber ribs with the diameter of 12, the hooping ribs are 6mm in diameter, the distance between the hooping ribs is 150mm, and the ring beam is filled and poured by adopting polymer mortar. After the well wall is reinforced, tests show that the anti-permeability performance of the well wall is improved by 89%, the shearing resistance bearing capacity is improved by 57%, the compression resistance bearing capacity is improved by 31%, the bending resistance bearing capacity is improved by 87%, the anti-seismic bearing capacity is improved by 71%, the ductility coefficient is improved by 58%, and the energy consumption capacity is improved by 124%.
Example 2.
The original tunnel wall is of a reinforced concrete structure, and the steel bar corrosion, the protective layer cracking, the concrete crack of 2-3cm and the partial concrete protective layer falling occur. And (3) reinforcing by adopting alkali-resistant glass fiber mesh reinforced aqueous epoxy mortar. The epoxy mortar comprises the following components: high belite sulphoaluminate cement, water-based epoxy, polyvinyl alcohol fiber, alkali-resistant glass fiber, sand, water, a water reducing agent, starch ether, cellulose ether and the like. The high belite sulphoaluminate cement accounts for 17 percent of the total mass of the mortar; the water-based epoxy accounts for 6% of the total mass of the mortar; the length of the polyvinyl alcohol fiber is 12-15mm, the diameter is 40-55 μm, the strength is 1700MPa, and the mass mixing amount is 0.4%; the length of the alkali-resistant glass fiber is 10-18mm, the diameter is 40-80 μm, the tensile strength is 1800MPa, and the mass mixing amount is 0.5%; the water-cement ratio is 0.42; the mass of the polycarboxylic acid water reducing agent is 0.15 percent of that of the cement. Starch ether, cellulose ether, etc. are all 0.01% of the cement. The sand accounts for 28 percent of the mass of the mortar, is quartz sand and has the fineness modulus of 2.85. The reinforcing process comprises the following steps: repairing cracks of concrete by using the mortar, treating the raw steel bars by using a rust remover, then smearing the mortar with the thickness of 6mm on the whole tunnel wall, pasting a layer of bidirectional alkali-resistant glass fiber grids, wherein the hole pitch of the alkali-resistant glass fiber is 7mm, and the tensile force per linear meter of the fiber grids in the warp and weft directions is 112 kN; smearing 2mm mortar, sticking a layer of alkali-resistant glass fiber grid (the size and performance of the grid are the same as those of the first layer), and then smearing 2.5mm mortar; then pasting a layer of bidirectional basalt fiber grids, wherein the hole pitch of the grids is 5mm, the tension of each linear meter of the fiber grids in the warp and weft directions is 72kN, and then smearing 3.5mm mortar; and then a layer of bidirectional carbon fiber grids is pasted, the hole pitch of the grids is 5mm, the tension of each linear meter of the fiber grids in the warp and weft directions is 172kN, and then 5mm mortar is smeared. After the tunnel wall is reinforced, tests show that the permeability resistance of the tunnel wall is improved by 101%, the shear resistance bearing capacity is improved by 71%, the bending resistance bearing capacity is improved by 87%, the earthquake resistance ductility coefficient is improved by 52%, and the earthquake resistance energy consumption is improved by 119%.
Claims (7)
1. A method for reinforcing an electric power tunnel by fiber mesh reinforced polymer mortar is characterized by comprising the following pretreatment steps:
(1) the method comprises the steps of performing pre-repair of filling and plugging on cracks of a masonry or concrete tunnel wall by using polymer mortar, and embedding the mortar into the cracks; coating the rusted steel bar surface with a steel bar preservative, and then coating an interface agent on the tunnel wall one to two times;
(2) and (3) reinforcing, namely reinforcing and repairing the tunnel wall and the wall upper cover plate on the basis of the pretreatment: firstly, coating a layer of 5-7mm of polymer mortar, attaching a fiber grid to the obtained mortar base layer, coating 2-3mm of polymer mortar on the fiber grid, attaching 1 layer of fiber grid, and coating polymer mortar on the fiber grid; by analogy, the number of layers of the fiber grids is adhered until the number of layers reaches the design requirement; the mortar of other layers except the first layer is gradually thickened, and the thickness of the mortar of the last layer is 4-6 mm;
the polymer mortar raw material comprises the following components: cement, polymer, polyvinyl alcohol fiber, alkali-resistant glass fiber, sand, water, a water reducing agent, starch ether and cellulose ether;
wherein the cement is selected from high belite sulphoaluminate cement and portland cement, and for reinforcement projects needing quick setting, the high belite sulphoaluminate cement is adopted, and the cement accounts for 11-17% of the total mass of the mortar; for the common engineering, Portland cement is adopted, and accounts for 21-27% of the total mass of the mortar; the cement is selected from BS-HFR42.5, BS-HFR52.5, P.II 42.5 and P.II 52.5;
the polymer is selected from waterborne epoxy resin, polyvinyl acetate emulsion or polypropylene emulsion; for reinforcement with high strength requirement, the polymer in the mortar adopts water-based epoxy resin, and the using amount of the polymer is 3-7% of the mass of the cement; for mortar with general strength requirement, the polymer adopts polyvinyl acetate emulsion or polypropylene emulsion, and the polymer accounts for 9-20% of the total mass of the mortar;
the length of the polyvinyl alcohol fiber is 12-15mm, the diameter is 40-55 μm, the strength is 1700MPa, and the mass mixing amount accounts for 0.4-0.6% of the mass of the mortar; meanwhile, the length of the doped alkali-resistant glass fiber is 10-18mm, the diameter is 40-80 μm, the tensile strength is 1800MPa, and the mass doping amount accounts for 0.4-0.9% of the mass of the mortar;
the water-cement ratio is 0.32-0.51;
the polycarboxylic acid water reducing agent accounts for 0.1-0.2% of the mass of the cement;
starch ether and cellulose ether are 0.01-0.02% of the mass of the cement;
the sand accounts for 21-36% of the mortar by mass, is washed river sand or quartz sand, and has a fineness modulus of 2.2-2.7.
2. The method according to claim 1, wherein step (2) is carried out to the inspection well wall needing to be reinforced simultaneously to perform seismic reinforcement, the upper part and the middle part of the inner surface of the inspection well wall are reinforced by ring beams, and the fiber ribs in the ring beams can adopt carbon fiber ribs, glass fiber ribs and basalt fiber ribs; the ring beam is as follows: longitudinal bars and stirrups are adopted and the polymer mortar is used for pouring.
3. A method according to claim 1, wherein the ring beam is provided with longitudinal 4 ϕ 12 or 4 ϕ 18 fibre reinforcement; the hooping adopts a fiber rib, and ϕ 6@150- ϕ 6@200 is matched; the concrete poured is polymer mortar.
4. The method of claim 2, wherein the borehole wall is reinforced and is a circular borehole wall or a rectangular borehole wall.
5. The method of claim 2, wherein the original well wall is a masonry or reinforced concrete structure.
6. The method according to claim 1, wherein the fiber mesh is bidirectional or unidirectional, and is one or more of a carbon fiber mesh, an aramid fiber mesh, an alkali-resistant glass fiber mesh and a basalt fiber mesh; or mixed weaving or mesh mixed sticking.
7. The method according to claim 1, wherein the pretreatment method in the step (1) is pretreatment before reinforcing the electric power tunnel, rust removal treatment is carried out on corrosion steel bars, repair pretreatment of filling and plugging polymer mortar for brickwork and concrete cracks is carried out, and surface cleaning and interface agent coating pretreatment are carried out on the wall of the tunnel;
for the point damage with leakage and good structure, the polymer mortar is adopted for plugging and sealing; for the tunnel with serious leakage and structural damage, plugging and filling the cavity with waterproof polymer mortar, and then performing the step (2): carrying out structural reinforcement, waterproof treatment and anticorrosion treatment on the tunnel and the well wall by using the fiber grid reinforced polymer mortar; and 3-6 layers of fiber mesh reinforced polymer mortar are adopted for reinforcing and repairing the tunnel with serious structural damage.
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| CN111594186B (en) * | 2020-05-18 | 2024-08-06 | 中铁第四勘察设计院集团有限公司 | Tunnel bottom repairing structure of railway expanded rock tunnel |
| CN111809911A (en) * | 2020-07-13 | 2020-10-23 | 中国二十二冶集团有限公司 | Construction method for solving corrosion of reinforcing steel bars at bottom of frame beam |
| CN112897958B (en) * | 2021-03-25 | 2022-09-23 | 南通大学 | Grid fabric reinforced cement-based composite material and preparation method thereof |
| CN113047869A (en) * | 2021-04-02 | 2021-06-29 | 清华大学 | Tunnel reinforcing structure and method for reinforcing sprayed fiber cement by fiber fabric net |
| CN113105188B (en) * | 2021-04-15 | 2022-09-30 | 中交第三公路工程局有限公司 | Electric pole reinforcing method based on fiber grid reinforced UHPC |
| CN112901207B (en) * | 2021-04-23 | 2023-04-07 | 中交路桥南方工程有限公司 | Treatment method for collapse in tunnel during arch change of secondary lining in sulfate corrosion section of operation tunnel |
| CN116396034A (en) * | 2023-04-03 | 2023-07-07 | 清华大学 | Composite surface layer structure |
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