CN114411577A - Anti-corrosion structure of reinforced concrete box culvert in saline soil area - Google Patents
Anti-corrosion structure of reinforced concrete box culvert in saline soil area Download PDFInfo
- Publication number
- CN114411577A CN114411577A CN202210142287.6A CN202210142287A CN114411577A CN 114411577 A CN114411577 A CN 114411577A CN 202210142287 A CN202210142287 A CN 202210142287A CN 114411577 A CN114411577 A CN 114411577A
- Authority
- CN
- China
- Prior art keywords
- reinforced concrete
- box culvert
- concrete box
- corrosion
- culvert
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 34
- 238000005260 corrosion Methods 0.000 title claims abstract description 29
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 title claims description 14
- 239000011780 sodium chloride Substances 0.000 title claims description 14
- 239000002689 soil Substances 0.000 title abstract description 8
- 230000007797 corrosion Effects 0.000 claims abstract description 14
- 239000012528 membrane Substances 0.000 claims abstract description 12
- 239000011248 coating agent Substances 0.000 claims abstract description 7
- 238000000576 coating method Methods 0.000 claims abstract description 7
- 239000004746 geotextile Substances 0.000 claims abstract description 5
- 238000010276 construction Methods 0.000 claims abstract description 3
- 239000004567 concrete Substances 0.000 claims description 30
- 239000004744 fabric Substances 0.000 claims description 17
- 239000010410 layer Substances 0.000 claims description 16
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 2
- 229920001903 high density polyethylene Polymers 0.000 claims description 2
- 239000004700 high-density polyethylene Substances 0.000 claims description 2
- 239000002344 surface layer Substances 0.000 claims description 2
- 230000001680 brushing effect Effects 0.000 claims 1
- 238000005034 decoration Methods 0.000 claims 1
- 238000007731 hot pressing Methods 0.000 claims 1
- 150000003839 salts Chemical class 0.000 abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- 239000002131 composite material Substances 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 201000010099 disease Diseases 0.000 abstract 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 abstract 1
- 230000000694 effects Effects 0.000 abstract 1
- 230000003204 osmotic effect Effects 0.000 abstract 1
- 238000000926 separation method Methods 0.000 abstract 1
- 239000003973 paint Substances 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 230000006378 damage Effects 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000002161 passivation Methods 0.000 description 4
- 230000003014 reinforcing effect Effects 0.000 description 4
- 230000035882 stress Effects 0.000 description 3
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000001110 calcium chloride Substances 0.000 description 2
- 229910001628 calcium chloride Inorganic materials 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F5/00—Draining the sub-base, i.e. subgrade or ground-work, e.g. embankment of roads or of the ballastway of railways or draining-off road surface or ballastway drainage by trenches, culverts, or conduits or other specially adapted means
- E01F5/005—Culverts ; Head-structures for culverts, or for drainage-conduit outlets in slopes
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/06—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against corrosion by soil or water
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
Abstract
The invention relates to a reinforced concrete box culvert anti-corrosion structure in a salinized soil area, which comprises a conventionally designed reinforced concrete box culvert structure, wherein a filament woven composite geotextile (two geotextiles and one membrane) is used for wrapping the reinforced concrete box culvert structure to achieve the effects of salt separation and water resistance, and an anti-corrosion coating is coated on the inner wall of the reinforced concrete box culvert to ensure that the inner wall of the reinforced concrete box culvert is also in a closed environment, so that the problem that the reinforced concrete structure is subjected to daily accumulated osmotic corrosion due to chemical reaction of salinized soil is effectively prevented, the problem of secondary salinized diseases of a roadbed is thoroughly solved, the construction is convenient, the manufacturing cost is low, good economic benefits and good social benefits are realized, and the reinforced concrete box culvert anti-corrosion structure has wide application prospects in the fields of highways, municipal administration, airport pipelines and the like in the salinized soil area.
Description
Technical Field
The invention relates to special culverts such as roads, municipal administration and airports, in particular to a reinforced concrete box culvert anti-corrosion structure in a saline land area.
Background
A culvert is a structure provided for drainage and passage of pipelines in engineering construction such as highways and municipalities. The culvert mainly comprises a round pipe culvert, a cover plate culvert, a reinforced concrete box culvert and a stone arch culvert.
The existing reinforced concrete box culvert is frequently corroded in a saline land area, and the main reasons are as follows: 1. cl-is the main cause of the corrosion of the steel bars, and areas with cl-in saline soil can corrode the steel bars. The high alkalinity of cement hydration enables a layer of compact passive film to be generated on the surface of the steel bar in the concrete. The cl-is an extremely strong passivator and is adsorbed at a local passivation film, so that the pH value of the local passivation film is rapidly reduced, and the passivation film on the surface of the reinforcing steel bar is damaged. The iron matrix is corroded as an anode, and the large-area passivation film area is used as a cathode. The large cathode corresponds to the small anode, so the corrosion speed is high. The corrosion volume expansion of the steel bar can exceed 6 times of the original volume, and is a main reason of concrete cracking. 2. Chemical corrosion in the engineering environment can form calcium chloride and gypsum, which are soluble in water, resulting in increased leaching of the concrete with consequent increased loss of strength and quality. 3. In porous concrete, the stress generated by the crystallization pressure of the salt may be sufficient to crack and break the concrete. 4. The freeze-thaw cycle reduces the strength of the concrete structure and causes expansion and collapse damage.
The reinforced concrete box culvert corrodes and can make the concrete structure of culvert suffer destruction, and then intensity reduces, and stability worsens, still can cause the culvert to leak even, shortens the life of culvert greatly, destroys even. At present, the corrosion problem of the reinforced concrete box culvert has not yet caused enough attention of departments such as traffic, municipal administration and the like, and when the culvert is corroded, only temporary maintenance methods such as crack repair, reinforcement and the like can be adopted, and salt-proof water-blocking protection is not fundamentally carried out.
Disclosure of Invention
The invention aims to provide an anti-corrosion structure of a reinforced concrete culvert, which is completely wrapped by two-cloth one-film composite geotextile, so that salinity is blocked and secondary salinization is prevented. The key technical problems of damage to a concrete structure and shortening of the service life of the concrete structure caused by corrosion when the culvert is built in the saline land area are effectively solved.
The culvert anti-corrosion structure provided by the invention comprises two cloth films and one film; the structure of the culvert itself; plain concrete cushion coat and anticorrosive coating; the top surface and the side surface of the culvert are wrapped and bonded with two films, the bottom surface is built on a plain concrete cushion layer, and anticorrosive paint is brushed inside the culvert; two films are laid under the plain concrete cushion foundation, and a base is arranged under the plain concrete cushion foundation. The two cloth membranes are filament woven geotextile and high density polyethylene geomembrane, and have the functions of preventing the migration of salt and moisture and preventing the culvert from being corroded.
The inner wall coating of the culvert is divided into a bottom layer, a middle layer and a surface layer, and is brushed with anticorrosive paint, cleaned, leveled and brushed again.
The length of the two cloth-one films connected with the plain concrete cushion layer is L +2B, L is the width of the cushion layer of the culvert, B is the length of a single side away from the edge of the culvert, generally about 5m, the two cloth-one films can be longitudinally or transversely paved in a whole width, and the seams are welded or lapped.
The width of the two cloth films on the top surface and the side surface of the culvert is L and H respectively, L is the span of the culvert, and H is the height of the culvert. The length is along the width of the cross section of the roadbed, and a certain margin is reserved for side slope edge covering.
The length of the two cloth films on the two sides of the top surface of the culvert is 5m from the edge of the culvert.
Compared with the prior art, the invention has the beneficial effects that:
the base is easy to pave two cloth films and one film, the roller can be rolled without damage, and the films and the structure have good ageing resistance. Adopt two cloth a membrane to wrap up the inside that the culvert wall body and culvert roof can effectual isolated salinity got into the culvert, reduce the inside cl-content of culvert, keep the fine and close passive film of inside PH and inside reinforcing bar surface production, reduce the reinforcing bar corrosion, prevent the concrete fracture.
The solution of different concentrations in the road bed can form calcium chloride and gypsum, and two cloth one membranes can effectual isolated this type of material, then culvert intensity and stable in quality.
The culvert anti-corrosion coating can isolate salt in air or flowing water in concrete of an inner wall structure, stress generated by crystallization pressure of salt can not enter the culvert structure, and the concrete can not crack and fall off.
The two films rich at the top and the bottom of the culvert are laid to a length, so that the secondary salinization speed and concentration of soil around the culvert can be better slowed down, and the stability of the roadbed is further protected.
Drawings
FIG. 1 is a schematic view of the corrosion-resistant structure of the culvert in the embodiment;
fig. 2 is a reinforcing bar diagram in the example.
Illustration of the drawings:
1. two cloth films are used; 2. a reinforced concrete box culvert; 3. anticorrosive paint 4 and plain concrete cushion; 5. reinforcing steel bars; 6. concrete; 7. hooping; 8. and (4) a stress rib.
Detailed Description
The invention is further illustrated below with reference to the figures and examples.
The reinforced concrete box culvert 2 provided by the embodiment is formed by casting C40 concrete and HRB235 steel bars in situ, and the width and the height of the reinforced concrete box culvert are 3.0 x 2.0 m.
Two cloth membranes 1 are laid on two sides of the wall body of the reinforced concrete box culvert 2, so that the side wall of the culvert is prevented from being corroded by saline soil.
Two cloth one membranes 1 are laid on the roadbed on two sides of the top of the reinforced concrete box culvert 2, the length of the two cloth one membranes 1 is 5.0m, and the two cloth one membranes 1 outside the wall body are tightly welded, so that salt is prevented from infiltrating from the road surface to corrode the culvert.
And a plain concrete cushion layer 4 is poured under the reinforced concrete box culvert 2, the thickness of the plain concrete cushion layer is 0.35m, and the plain concrete cushion layer mainly plays a role in improving the bearing capacity of the foundation and reducing the uneven settlement of the foundation for enlarging the foundation.
Two cloth one membranes 1 are laid on the bottom surface of the plain concrete cushion layer 4, the length of the two cloth one membranes 1 is 3.0m except that the length of the culvert is satisfied, the two sides of the wall body 3 of the culvert are respectively prolonged by 5.0m, underground salt migration can be better blocked, and the salt concentration at the periphery of the culvert in a certain range is better protected.
The reinforced concrete box culvert 2 internal coating divides bottom (epoxy resin sealing paint 50u m), intermediate level (epoxy resin paint 260 um) and surface course (fluorocarbon finish paint 90um), and the all-round no space is brushed, and protection reinforced concrete box culvert 2 that can be better avoids harm such as air and flowing water corrosion, reinforcing bar corrosion.
Claims (7)
1. A reinforced concrete box culvert anti-corrosion structure for a saline land area comprises two pieces of cloth and one film (1); the reinforced concrete box culvert (2), two cloth membranes (1) are wrapped around the reinforced concrete box culvert (2) and are located on the plain concrete cushion layer (4); the anti-corrosion coating (3) is coated on the inner wall of the reinforced concrete box culvert (2) in a brushing mode and comprises a bottom layer, a middle layer and a surface layer.
2. The reinforced concrete box culvert anti-corrosion structure for the saline land area as claimed in claim 1, wherein the two cloth-one membranes (1) are formed by hot pressing filament woven geotextile wrapped high density polyethylene geomembrane.
3. The saline land area reinforced concrete box culvert anti-corrosion structure is characterized in that the reinforced concrete box culvert (2) is formed by integrally casting a concrete material (6) and a reinforcing steel bar (5) in a cast-in-place mode.
4. The saline land area reinforced concrete box culvert corrosion-resistant structure is characterized in that the plain concrete cushion layer (4) is made of C15 gravel concrete without construction joints, and a layer of two films (1) is laid below the plain concrete cushion layer.
5. The reinforced concrete box culvert anti-corrosion structure for the saline land area as claimed in claim 1, characterized in that the anti-corrosion coating (3) should be specially designed to have both protection and decoration functions and to have a long service life.
6. The saline land area reinforced concrete box culvert corrosion-resistant structure is characterized in that the concrete material (6) meets the design specification requirement.
7. The saline land area reinforced concrete box culvert corrosion-resistant structure is characterized in that the reinforcing steel bars (5) adopt stirrups (7) and stress bars (8) which meet design specifications.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210142287.6A CN114411577A (en) | 2022-02-20 | 2022-02-20 | Anti-corrosion structure of reinforced concrete box culvert in saline soil area |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210142287.6A CN114411577A (en) | 2022-02-20 | 2022-02-20 | Anti-corrosion structure of reinforced concrete box culvert in saline soil area |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114411577A true CN114411577A (en) | 2022-04-29 |
Family
ID=81261106
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210142287.6A Pending CN114411577A (en) | 2022-02-20 | 2022-02-20 | Anti-corrosion structure of reinforced concrete box culvert in saline soil area |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114411577A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107059924A (en) * | 2017-05-22 | 2017-08-18 | 中铁第勘察设计院集团有限公司 | Subway open-cut station comprehensive protection system and its construction method under strong corrosive environment |
| CN107386337A (en) * | 2017-06-07 | 2017-11-24 | 国家电网公司 | Concrete foundation anticorrosion structure and its application |
| CN112900177A (en) * | 2021-02-02 | 2021-06-04 | 青海省交通投资有限公司 | Composite geomembrane salt-separating water-blocking partition layer structure |
| CN215862109U (en) * | 2021-07-08 | 2022-02-18 | 新疆交通建设集团股份有限公司 | High-corrosion-resistance and high-durability steel corrugated pipe |
-
2022
- 2022-02-20 CN CN202210142287.6A patent/CN114411577A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107059924A (en) * | 2017-05-22 | 2017-08-18 | 中铁第勘察设计院集团有限公司 | Subway open-cut station comprehensive protection system and its construction method under strong corrosive environment |
| CN107386337A (en) * | 2017-06-07 | 2017-11-24 | 国家电网公司 | Concrete foundation anticorrosion structure and its application |
| CN112900177A (en) * | 2021-02-02 | 2021-06-04 | 青海省交通投资有限公司 | Composite geomembrane salt-separating water-blocking partition layer structure |
| CN215862109U (en) * | 2021-07-08 | 2022-02-18 | 新疆交通建设集团股份有限公司 | High-corrosion-resistance and high-durability steel corrugated pipe |
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Application publication date: 20220429 |