CN102296967A - Method for repairing sulphate attack disease of tunnel lining concrete structure - Google Patents
Method for repairing sulphate attack disease of tunnel lining concrete structure Download PDFInfo
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- CN102296967A CN102296967A CN201110165305A CN201110165305A CN102296967A CN 102296967 A CN102296967 A CN 102296967A CN 201110165305 A CN201110165305 A CN 201110165305A CN 201110165305 A CN201110165305 A CN 201110165305A CN 102296967 A CN102296967 A CN 102296967A
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Abstract
The invention discloses a method for repairing the sulphate attack disease of a tunnel lining concrete structure, comprising the following steps of: firstly, effectively cleaning a disease region, isolating and dredging erosive ions, reinforcing original rib materials; secondly, repairing by adopting an erosion-resistant repairing material and processing a surface coating, and ensuring the whole repair construction quality; and finally, achieving effective repair of the diseased tunnel structure. According to the method, the sulphate attack resistance of the tunnel lining concrete structure with the salt attack disease can be remarkably improved, and the service life of the original tunnel structure is effectively prolonged; and the method has the characteristics of technical and economic advantages and strong maneuverability.
Description
Technical field
The present invention relates to a kind of method for repairing and mending, effectively prolong existing tunnel lining concrete structure service life under the sulfate attack condition existing tunnel concrete structure sulfate attack disease.
Background technology
The tunnel is that a class is embedded in the cavity structure thing under (rock) soil layer, and the outside is in the water in country rock (soil) and the rock stratum, the effect of ionic medium; Internal construction is faced sky, is subjected to the effect of the atmospheric environment of relative closure; Simultaneously, under operation state, also be subjected to the influence of operations such as pedestrian, vehicle.Its typical structure pattern is seen the shown in Figure 1 of Figure of description part.It is significantly different that the special structural shape of this class of tunnel and general concrete structures exist, and is mainly reflected in the effect that all is subjected to surrounding medium inside and outside the lining concrete structure, and the damage deterioration is serious.The liner structure thing back side directly contacts with ground, ambient water, is subjected to the influence of aggressivity material in rock stratum of living in, the soil body, as SO
4 2-, Cl
-, HCO
3 -, CO
3 2-, H
+, Mg
2+, NH
4 +Deng infiltration, the diffusion of medium under the effect of barometric gradient, concentration gradient, make water in the soil layer, aggressivity ionic medium migrate to concurrent biological reason, chemical action in the concrete; The liner structure inner surface faces sky, be exposed in the atmospheric environment of a relative closure, in the operation process, be subjected to the influence of frequent blast, cause internal relative humidity to change, under capillary siphon, evaporation, further quickened water, the ion transition process in concrete in the country rock, and because lower grade of tunnel lining sprayed concrete strength, density is relatively poor etc., make the tunnel that seepage very easily take place, the strange phenomenon of " no tunnel does not leak " appears.The result of seepage makes the inside concrete hydrated product constantly run off, and finally cause concrete destruction, but this process is comparatively slow; If the aqueous solution also contains Sulfates aggressivity ion in the rock stratum, then enter in the lining concrete sulfate ion not only with concrete generation chemical attack effect, also the sulphate crystal effect occurs, cause the lining concrete rapid damage at tunnel lining inner surface (free face).
There is salt damage environment widely in China, particularly in the northwest, extensively there is the Sulfates environment in the southwest, the highway that these areas are built, the railway tunnel overwhelming majority are destroyed by serious sulfate attack, some tunnel needs to safeguard all the year round and could keep operation, build early Chengdu-Kunming railway tunnel along the line etc. as China, there is serious sulphate corrosion in most of tunnel linings.The main cause of its corrosion is, the tunnel is abundant by the regional face of land (underground) water, the water electrode easy to leak to the tunnel, the aggressivity ionic medium that wherein carries and concrete structure generation physics, chemical corrosion function, the deterioration even the destruction that have caused tunnel structure.How percolating water is drained that to dredge be current difficult point of guaranteeing to repair validity.
At tunnel lining concrete serious phenomenon of erosion damage under sulfate attack, many professional persons have carried out unremitting effort, developed some repairing techniques, tunnel lining concrete sulfate attack disease has been repaired as adopting sulfate resisting cement, polymer, special anti-corrosion agent etc.Yet owing to many reasons, the comprehensive technology economic effect of present most of repairing technique and patching material is not good enough, and tunnel structure is absorbed in the vicious circle of frequent repairing.
Under the sulfate corrosion environment, the tunnel lining concrete structure is in the Service Environment of the extreme harshness under the multiple erosion, the thorough elimination that realizes existing tunnel lining concrete sulfate attack disease is a very thing of difficulty, and the reason that necessary this condition tunnel lining concrete of thoroughly grasp destroys could realize effective control and repairing at corresponding disease.
Summary of the invention
Technical problem to be solved by this invention provides a kind of possessing skills property, economy comprehensive effect, reduce the destruction and the maintenance work thereof of existing tunnel lining concrete under the sulfate attack condition, effectively prolong the method for repairing and mending of tunnel lining concrete structure sulfate attack disease of the service life of existing tunnel lining concrete structure.
Under the sulfate attack effect, corrode the serious difficult problem of deterioration in order to solve the existing tunnel lining concrete, realize the Efficient software patching of existing tunnel salt corrosion disease, the present invention is directed to the corrosion function mechanism of tunnel structure characteristics, Service Environment condition and etching medium, each links such as cleaning, patching material selection and construction technology from existing disease zone, adopt " initiatively " and " passive " to defend the principle that combines, proposed a whole set of repairing technique scheme of existing tunnel liner structure salt corrosion disease.
The method for repairing and mending of tunnel lining concrete structure sulfate attack disease provided by the invention, at first effectively clear up the disease zone, isolate and dredge the aggressivity ion, strengthen handling original muscle material, adopt the patching material repairing and the face coat of corrosion resistance then and guarantee whole reparation construction quality, finally reach Efficient software patching, comprise following technical step existing disease tunnel structure:
(1), the cleaning in disease zone:
Adopt giant or machine cuts mode that salt corrosion disease zone is thoroughly removed,,, bottom is taken a sample, test bottom concrete sample endoporus solution S O for guaranteeing to remove thoroughly until exposing fresh bottom
4 2-Content, require the hole solution SO of institute's test specimens
4 2-Content be not more than 200mg/l;
(2), the isolation of aggressivity ion is dredged:
Behind the completing steps (1), the bottom scope of being cleared up, pipe is dredged in from top to bottom direction setting along the seepage position, so that effectively diversion percolating water, ionic medium are to the special-purpose drainage groove of tunnel side wall bottom, reduce as far as possible or avoids the aggressivity ionic medium to concrete corrosion function;
(3), the reinforcement of original structure muscle material:
In to the corrosion layer scale removal process, whether corrosion-deformation is checked to the muscle material of former setting, and the muscle material of corrosion-deformation is changed or carried out the disposal that anti-corrosion protection is strengthened;
(4), corrosion resistance cement based patching material and coating:
Deterioration principle analysis based on corrosion area, special-purpose patching material of cement based and organosilicon surface coating method that employing can be resisted the salt corrosion effect and can be adapted to the field patch construction requirement are repaired corrosion layer, reduce or avoid chemical action between patching material and the sulfate ion to reach, and prevent or avoid the surface evaporation effect to quicken the target of the physical crystal erosion effect of salt ion, the special-purpose patching material of described cement based is by Portland cement, the salic minerals component, expansion component, the rubber-based polymer component, the polyacrylonitrile fibre and the adjusting component of condensing are formed, and its mass ratio is: 60: 30: 8: 2～3: 0.3: 2～4;
(5) construction quality guarantees: 1. based on set repairing technique scheme, abide by relevant criterion and rules and require the buying raw material, carry out encapsulation process to being transported to the on-the-spot patching material of repairing, avoid being etched property ionic soil; 2. adopt the water of not being etched property ionic soil to mix the system patching material, and, adopt special equipment to mix system according to corresponding match ratio; 3. carry out closely knit casting and constructing according to corresponding casting construction process, and the corresponding test specimen of in-place forming, performance indications such as the resisting erosion of sulfate coefficient of detection test specimen and transmission coefficient; 4. the patching material after the cast is carried out surface coverage film moisture-keeping maintaining 7d at least; 5. under surface dry condition, the patching material surface crosswise is sprayed organic silicon coating 2 times by operation.
Gutter described in the above-mentioned steps (2) is that caliber is the rigid plastics guide water pipe of Φ 15～30mm and tube wall band mesh, described dredge pipe be provided with the distance be 400～600mm.
Portland cement described in the above-mentioned steps (4) is P0.42.5 and class g cement such as above, and institute to mix composite material be non-agstone, C
3A content is less than 7%.
Salic minerals component described in the above-mentioned steps (4) is 3 mixture that I level flyash, S95 level slag and silicon ash mix by mass ratio at 5: 3: 2.
Expansion component described in the above-mentioned steps (4) is a calcium sulphoaluminate type expansion agent.
Rubber-based polymer described in the above-mentioned steps (4) is a main component with reclaimed rubber powder particles, ethylenic copolymer latex powder, is pulverulent solids, and granularity is between 20～40 orders.
Condensing described in the above-mentioned steps (4) regulated component and had the short function of coagulating, the described adjusting component of condensing is made up of by mass ratio the plaster of paris, oxalic acid at 1: 1, can add according to concrete execution conditions, if field by using formwork cast vibration compacting construction, the adjusting component of condensing is added by lower limit, if reality is pressed sprayed construction, the adjusting component of condensing is added by the upper limit.
The present invention is based on a large amount of investigations and the Analysis on Mechanism thereof to cream salt area, China southwest existing tunnel lining concrete structure disease, and on the basis of grasping at present to the maintenance technique present situation of such disease, take all factors into consideration each link of repairing technique systematic procedure, engineering application practice achievement in conjunction with this invention technology, in conjunction with related scientific research important function for of research basis, dredge and aspect such as anti-erosion reparation construction from the isolation of effective removing of existing disease part, harmful ion, the final summary formed the present invention.Technical basis of the present invention is abundant, and is scientific strong.
Advantage of the present invention and good effect are:
1. the present invention is on the basis of the corrosion function mechanism of integrating tunnel design feature, Service Environment condition and etching medium, the principle that adopts " initiatively " and " passive " defence to combine, take all factors into consideration each link of mending course, a whole set of repairing technique scheme of the existing tunnel liner structure salt corrosion disease that proposes has systematicness and science.
2. the present invention has adopted the thorough clearance technique of guaranteeing basalis and the isolation of harmful ion to dredge technology, guarantees the validity of repairing technique.
3. the present invention has taken into full account the on-the-spot characteristics of reparation construction, and workable, it is convenient to use.
4. but in the life-span of the present invention's significant prolongation repairing work structure, have tangible technology economy advantage, social benefit is good.
In sum, the present invention is a kind of repairing technique of tunnel lining concrete sulfate attack disease, this repairing technique can significantly improve the sulphate-corrosion resistance energy of existing salt corrosion disease tunnel lining structure, effectively prolong the service life of existing tunnel structure, and the economic advantages that possess skills, workable characteristics.
Description of drawings
Fig. 1 is a tunnel structure form schematic diagram;
Fig. 2 is that the technology of the present invention and original repairing technique are repaired after the scene contrast photo in March.
The specific embodiment
Following examples are intended to illustrate the present invention rather than to further qualification of the present invention.
The method for repairing and mending of tunnel lining concrete structure sulfate attack disease, at first effectively clearing up the disease zone carries out, isolate and dredge the aggressivity ion, strengthen handling original muscle material, adopt the patching material of corrosion resistance to repair and guarantee whole reparation construction quality then, finally reach Efficient software patching, comprise following technical step existing disease tunnel structure:
(1), the cleaning in disease zone:
Adopt giant or machine cuts mode that salt corrosion disease zone is thoroughly removed,,, bottom is taken a sample, test bottom concrete sample endoporus solution S O for guaranteeing to remove thoroughly until exposing fresh bottom
4 2-Content, require the hole solution SO of institute's test specimens
4 2-Content should be not more than 200mg/l;
(2), the isolation of aggressivity ion is dredged:
Behind the completing steps (1), the bottom scope of being cleared up, along seepage position direction from top to bottom the rigid plastics guide water pipe that caliber is Φ 15～30mm and tube wall band mesh is set, dredge pipe every 400～600mm apart from setting, so that effectively diversion percolating water, ionic medium are to the special-purpose drainage groove of tunnel side wall bottom, reduce as far as possible or avoid the aggressivity ionic medium concrete corrosion function;
(3), the reinforcement of original structure muscle material:
In to the corrosion layer scale removal process, whether corrosion-deformation is checked to the muscle material of former setting, and the muscle material of corrosion-deformation is changed or carried out the disposal that anti-corrosion protection is strengthened;
(4), corrosion resistance cement based patching material and coating:
Deterioration principle analysis based on corrosion area, special-purpose patching material of cement based and organosilicon surface coating method that employing can be resisted the salt corrosion effect and can be adapted to the field patch construction requirement are repaired corrosion layer, reduce or avoid chemical action between patching material and the sulfate ion to reach, and prevent or avoid the surface evaporation effect to quicken the target of the physical crystal erosion effect of salt ion, the special-purpose patching material of described cement based is by Portland cement, the salic minerals component, expansion component, the rubber-based polymer component, the polyacrylonitrile fibre and the adjusting component of condensing are formed, and its mass ratio is: 60: 30: 8: 2～3: 0.3: 2～4; Portland cement is P0.42.5 and class g cement such as above, and institute to mix composite material be non-agstone, C
3A content is less than 7%, the salic minerals component is 3 mixture that I level flyash, S95 level slag and silicon ash mix by mass ratio at 5: 3: 2, expansion component is a calcium sulphoaluminate type expansion agent, rubber-based polymer is a main component with reclaimed rubber powder particles, ethylenic copolymer latex powder, be pulverulent solids, granularity is between 20～40 orders; The adjusting component of condensing has the short function of coagulating, the described adjusting component of condensing is made up of by mass ratio the plaster of paris, oxalic acid at 1: 1, can add according to concrete execution conditions, if field by using formwork cast vibration compacting construction, the adjusting component of condensing is added by lower limit, if reality is pressed sprayed construction, the adjusting component of condensing is added by the upper limit;
(5) construction quality guarantees:
1. based on set repairing technique scheme, abide by relevant criterion and rules and require the buying raw material, the patching material that is transported to the scene of repairing is carried out encapsulation process, avoid being etched property ionic soil; 2. adopt the water of not being etched property ionic soil to mix the system patching material, and, adopt special equipment to mix system according to corresponding match ratio; 3. carry out closely knit casting and constructing according to corresponding casting construction process, and the corresponding test specimen of in-place forming, performance indications such as the resisting erosion of sulfate coefficient of detection test specimen and transmission coefficient; 4. the patching material after the cast is carried out surface coverage film moisture-keeping maintaining 7d at least; 5. under surface dry condition, the patching material surface crosswise is sprayed organic silicon coating 2 times by operation.
Embodiment:
Extensively logical section farad tunnel has carried out application practice to the technology of the present invention in existing railway Chengdu-Kunming railway Yunnan.Chengdu-Kunming railway is the southwestern trunk railway that China built at the end of the sixties, owing to be located in southwest, geological conditions is complicated and extensively have a sulfate attack medium, particularly railway tunnel structure Service Environment condition is abominable unusually for engineering structures, thereby the most of location of this railway is in the maintenance stage all the year round, the practice of this repairing application is selected in farad tunnel that has typical sulfur hydrochlorate eating condition under (as shown in Figure 1, among the figure: the 1-lining concrete, the 2-country rock, the 3-free face) carries out, this tunnel sulphate corrosion is serious, needs all the year round constantly maintenance could guarantee the railway security operation.
The technician has selected repairing technique scheme of the present invention on the basis to patcher's spot corrosion pattern investigation and analysis.According to technical solution of the present invention, the technician at first adopts wide logical track division special cutting device that the disease layer of concrete of repairing area is removed, and detects and determines that basalis does not have obvious erosion SO
4 2-Ion is provided with special use to the basalis issue then and dredges pipe and carried out dredging and sealing isolation, then the strength bar material has been carried out checking and protection is handled; Adopt giant to carry out basalis in the back that disposes to basalis and clean, adopt the special-purpose patching material of cement based to carry out scene system of mixing and construction then, system and specimen molding, cast are mixed in the special-purpose patching material of cement based scene; The cement based patching material construction back 1d form removal that finishes, water seasoning be to 3d during the length of time, and keep 2 times organic silicon coatings of brushing under the surface dry condition on the surface, and whole operation is carried out in strict accordance with construction sequence, guarantees construction quality.For good effect more of the present invention, adopt the repairing technique measure commonly used of wide logical public affair section to carry out repairing practice the same period in this implementation process, its repair efficiency contrast photo is as shown in Figure 2.
Photo contrast effect from Fig. 2 as can be known, repairing technique of the present invention has significant technical advantage.Because this repairing area is in the abutment wall position, the corrosive medium in the abutment wall bottom discharge groove very easily capillary is adsorbed onto in the side wall concrete, and this is the major reason that causes the lining side wall concrete corrosion failure.Adopt the zone after the technology of the present invention is repaired not see that after March the sulfate attack medium is adsorbed onto concrete surface layer, adopt then visible significantly salt absorption crystallization of this track division conventional art repairing area and damage phenomenon.Obviously, the repair efficiency of the technology of the present invention is good, can effectively prolong the service life of existing tunnel structure.
Claims (8)
1. the method for repairing and mending of a tunnel lining concrete structure sulfate attack disease, at first effectively clear up the disease zone, isolate and dredge the aggressivity ion, strengthen handling original muscle material, adopt the patching material repairing and the face coat of corrosion resistance to handle and guarantee whole reparation construction quality then, finally reach Efficient software patching, it is characterized in that: comprise following technical step existing disease tunnel structure:
(1), the cleaning in disease zone:
Adopt giant or machine cuts mode that salt corrosion disease zone is thoroughly removed,,, bottom is taken a sample, test bottom concrete sample endoporus solution S O for guaranteeing to remove thoroughly until exposing fresh bottom
4 2-Content, require the hole solution SO of institute's test specimens
4 2-Content be not more than 200mg/l;
(2), the isolation of aggressivity ion is dredged:
Behind the completing steps (1), the bottom scope of being cleared up, pipe is dredged in from top to bottom direction setting along the seepage position, so that effectively diversion percolating water, ionic medium are to the special-purpose drainage groove of tunnel side wall bottom, reduce as far as possible or avoids the aggressivity ionic medium to concrete corrosion function;
(3), the reinforcement of original structure muscle material:
In to the corrosion layer scale removal process, whether corrosion-deformation is checked to the muscle material of former setting, and the muscle material of corrosion-deformation is changed or carried out the disposal that anti-corrosion protection is strengthened;
(4), corrosion resistance cement based patching material and coating:
Deterioration principle analysis based on corrosion area, special-purpose patching material of cement based and organosilicon surface coating method that employing can be resisted the salt corrosion effect and can be adapted to the field patch construction requirement are repaired corrosion layer, the special-purpose patching material of described cement based is made up of Portland cement, salic minerals component, expansion component, rubber-based polymer component, polyacrylonitrile fibre and the adjusting component of condensing, and its mass ratio is: 60: 30: 8: 2～3: 0.3: 2～4.
2. the method for repairing and mending of tunnel lining concrete structure sulfate attack disease according to claim 1 is characterized in that: said method comprises that also step (5) construction quality guarantees:
1. based on set repairing technique scheme, abide by relevant criterion and rules and require the buying raw material, the patching material that is transported to the scene of repairing is carried out encapsulation process, avoid being etched property ionic soil; 2. adopt the water of not being etched property ionic soil to mix the system patching material, and, adopt special equipment to mix system according to corresponding match ratio; 3. carry out closely knit casting and constructing according to corresponding casting construction process, and the corresponding test specimen of in-place forming, performance indications such as the resisting erosion of sulfate coefficient of detection test specimen and transmission coefficient; 4. the patching material after the cast is carried out surface coverage film moisture-keeping maintaining 7d at least; 5. under surface dry condition, the patching material surface crosswise is sprayed organic silicon coating 2 times by operation.
3. the method for repairing and mending of tunnel lining concrete structure sulfate attack disease according to claim 1 and 2, it is characterized in that: the gutter described in the above-mentioned steps (2) is that caliber is the rigid plastics guide water pipe of Φ 15～30mm and tube wall band mesh, described dredge pipe be provided with the distance be 400～600mm.
4. the method for repairing and mending of tunnel lining concrete structure sulfate attack disease according to claim 1 and 2, it is characterized in that: the Portland cement described in the above-mentioned steps (4) is P0.42.5 and class g cement such as above, and it is non-agstone that composite material is mixed by institute, C
3A content is less than 7%.
5. the method for repairing and mending of tunnel lining concrete structure sulfate attack disease according to claim 1 and 2 is characterized in that: the salic minerals component described in the above-mentioned steps (4) is 3 mixture that I level flyash, S95 level slag and silicon ash mix by mass ratio at 5: 3: 2.
6. the method for repairing and mending of tunnel lining concrete structure sulfate attack disease according to claim 1 and 2 is characterized in that: the expansion component described in the above-mentioned steps (4) is a calcium sulphoaluminate type expansion agent.
7. the method for repairing and mending of tunnel lining concrete structure sulfate attack disease according to claim 1 and 2, it is characterized in that: the rubber-based polymer described in the above-mentioned steps (4) is a main component with reclaimed rubber powder particles, ethylenic copolymer latex powder, be pulverulent solids, granularity is between 20～40 orders.
8. the method for repairing and mending of tunnel lining concrete structure sulfate attack disease according to claim 1 and 2, it is characterized in that: condensing described in the above-mentioned steps (4) regulated component and had the short function of coagulating, the described adjusting component of condensing is made up of by mass ratio the plaster of paris, oxalic acid at 1: 1, can add according to concrete execution conditions, if field by using formwork cast vibration compacting construction, the adjusting component of condensing is added by lower limit, if reality is pressed sprayed construction, the adjusting component of condensing is added by the upper limit.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108856014A (en) * | 2018-06-29 | 2018-11-23 | 平顶山平煤机煤矿机械装备有限公司 | Tunnel lining trolley formwork cleaner |
| CN110987771A (en) * | 2019-10-29 | 2020-04-10 | 交通运输部公路科学研究所 | Test method for simulating interface concrete corrosion between tunnel lining structure and surrounding rock |
| CN113582650A (en) * | 2021-08-05 | 2021-11-02 | 上海市建筑科学研究院有限公司 | Rapid-hardening high-corrosion-resistance mortar repair material for sewage concrete structure |
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| KR100909997B1 (en) * | 2009-04-07 | 2009-07-29 | (주)삼원건설시스템 | Composition of acid-resistant repair mortar and acid-resistant surface coating, and repair method of section and surface of concrete using its |
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| CN1066433A (en) * | 1991-05-04 | 1992-11-25 | 中国建筑材料科学研究院 | Sand-cement slurry or concrete erosion resistant material and manufacture method thereof |
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| CN108856014A (en) * | 2018-06-29 | 2018-11-23 | 平顶山平煤机煤矿机械装备有限公司 | Tunnel lining trolley formwork cleaner |
| CN108856014B (en) * | 2018-06-29 | 2023-07-21 | 平顶山平煤机煤矿机械装备有限公司 | Tunnel lining trolley template cleaning machine |
| CN110987771A (en) * | 2019-10-29 | 2020-04-10 | 交通运输部公路科学研究所 | Test method for simulating interface concrete corrosion between tunnel lining structure and surrounding rock |
| CN113582650A (en) * | 2021-08-05 | 2021-11-02 | 上海市建筑科学研究院有限公司 | Rapid-hardening high-corrosion-resistance mortar repair material for sewage concrete structure |
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| CN102296967B (en) | 2013-11-20 |
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