CN111893874A - Anticorrosion method for lower structure connecting part of pile-column integrated prefabricated bridge - Google Patents
Anticorrosion method for lower structure connecting part of pile-column integrated prefabricated bridge Download PDFInfo
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- CN111893874A CN111893874A CN202010757472.7A CN202010757472A CN111893874A CN 111893874 A CN111893874 A CN 111893874A CN 202010757472 A CN202010757472 A CN 202010757472A CN 111893874 A CN111893874 A CN 111893874A
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- connecting part
- lower structure
- iron sheet
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- 238000000034 method Methods 0.000 title claims abstract description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 56
- 238000005260 corrosion Methods 0.000 claims abstract description 48
- 230000007797 corrosion Effects 0.000 claims abstract description 44
- 229910052742 iron Inorganic materials 0.000 claims abstract description 28
- 239000011248 coating agent Substances 0.000 claims abstract description 20
- 238000000576 coating method Methods 0.000 claims abstract description 20
- 239000004588 polyurethane sealant Substances 0.000 claims abstract description 15
- 238000010276 construction Methods 0.000 claims abstract description 10
- 239000004519 grease Substances 0.000 claims description 24
- 239000004593 Epoxy Substances 0.000 claims description 15
- 238000002347 injection Methods 0.000 claims description 15
- 239000007924 injection Substances 0.000 claims description 15
- 229910000831 Steel Inorganic materials 0.000 claims description 12
- 239000003973 paint Substances 0.000 claims description 12
- 239000010959 steel Substances 0.000 claims description 12
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 6
- 239000010445 mica Substances 0.000 claims description 6
- 229910052618 mica group Inorganic materials 0.000 claims description 6
- 239000011701 zinc Substances 0.000 claims description 6
- 229910052725 zinc Inorganic materials 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 3
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 3
- 238000000746 purification Methods 0.000 claims description 3
- 238000005488 sandblasting Methods 0.000 claims description 3
- 238000004381 surface treatment Methods 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 238000004364 calculation method Methods 0.000 claims description 2
- 101100334009 Caenorhabditis elegans rib-2 gene Proteins 0.000 description 2
- 238000004210 cathodic protection Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/08—Damp-proof or other insulating layers; Drainage arrangements or devices ; Bridge deck surfacings
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
-
- 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
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Architecture (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention provides an anticorrosion method for a lower structure connecting part of a pile-column integrated prefabricated bridge, which comprises the following steps of: (1) carrying out corrosion allowance design on the lower structure connecting part; (2) carrying out corrosion coating on the flange plate and the bolt before the pile is installed on site; (3) after the pile is hoisted in place, a flange plate is installed; (4) an outer-coated iron sheet is arranged on the periphery of the flange plate, the outer-coated iron sheet is positioned between the two connecting piles, and the bolt is positioned on the inner side of the outer-coated iron sheet; (5) injecting polyurethane sealant to the inner side of the outer clad iron sheet; (6) and finishing the anticorrosion construction of the connecting part. The method adopts a mode of combining three measures to carry out anti-corrosion treatment on the connecting part, wherein the first measure is to set enough corrosion allowance on the flange connection according to the specific environment, the second measure is to adopt anti-corrosion coating, and the third measure is to carry out closed treatment, so that the connecting part between the piles and the columns of the lower structure of the assembled bridge has enough corrosion resistance by adopting the three measures.
Description
Technical Field
The invention relates to the technical field of construction of assembled bridges, in particular to an anticorrosion method for a lower structure connecting part of a pile-column integrated prefabricated bridge, which is mainly used for anticorrosion of a bridge lower structure connecting part with a 'pile-column integrated' process.
Background
With the guidance of national and local policies in recent years, the assembly type construction technology has been vigorously developed. The bridge assembly construction technology has gradually expanded from the prefabricated assembly of the upper structure to the lower structure. Because piles and columns in the bridge substructure often reach tens of meters in length, in order to facilitate prefabrication and transportation, the piles and the columns are often prefabricated into multiple sections and are spliced on site after being transported to the site. Meanwhile, in order to simplify the site construction and reduce the occupied area of the site after the construction, the traditional bearing platform connection mode between the piles is changed into flange connection, namely the structure of the bearing platform is removed, and the lower structure of the bridge is designed into 'pile-column integration'. Since the design years of bridges often exceed 80 years, it is important and urgent to provide appropriate corrosion protection measures to ensure sufficient durability.
Disclosure of Invention
In view of the above, it is necessary to provide a method for preventing corrosion of a lower connection portion of a pile-integrated prefabricated bridge, which can provide sufficient corrosion resistance to a lower structure pile-to-pile connection portion of a fabricated bridge.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the method for preventing corrosion of the lower structure connecting part of the pile-column integrated prefabricated bridge comprises the following steps of:
(1) carrying out corrosion allowance design on the lower structure connecting part;
(2) carrying out corrosion coating on the flange plate and the bolt before the pile is installed on site;
(3) after the pile is hoisted in place, a flange plate is installed;
(4) an outer-coated iron sheet is arranged on the periphery of the flange plate, the outer-coated iron sheet is positioned between the two connecting piles, and the bolt is positioned on the inner side of the outer-coated iron sheet;
(5) injecting polyurethane sealant to the inner side of the outer clad iron sheet;
(6) and finishing the anticorrosion construction of the connecting part.
Preferably, in step (1), the corrosion margin is calculated as follows:
Δ＝K[(1-p)t1+(t-t1)]
in the formula (I), the compound is shown in the specification,
delta-steel structure single-side corrosion allowance, unit: the thickness of the film is mm,
k-steel structure single-side average corrosion rate, unit: mm/a of the total weight of the alloy,
p-protection efficiency, unit: percent by weight,
t1design age of corrosion protection measures, unit: a, the number of the first-time contact points is less than the number of the second-time contact points,
design service life of the t-steel structure, unit: a.
preferably, in the step (2), the corrosion coating of the flange plate is performed according to the following steps and requirements: 1) surface purification treatment is carried out to achieve the conditions of no oil and dryness; 2) secondary surface sand blasting to remove rust, reaching Sa2.5 grade, Rz30-70 μm; 3) two epoxy zinc-rich primers, wherein the thickness of each primer is more than 50 mu m; 4) two epoxy mica iron intermediate paints, wherein the thickness of each epoxy mica iron intermediate paint is more than 100 mu m; 5) two layers of fluorocarbon finish paint, wherein the thickness of each layer is more than 40 mu m; 6) and (6) repairing the welding seam.
Preferably, in the step (2), the bolt corrosion coating is performed according to the following steps and requirements: 1) before screwing, the friction surface is subjected to surface treatment, oil and dirt are removed, and exposed parts of a bolt, a nut and a gasket are mechanically polished; 2) after the bolt is finally screwed, coating epoxy zinc-rich primer for one 80 mu m on the exposed parts of the bolt, the nut and the washer; 3) and coating the whole with 120 mu m of epoxy thick paste paint.
Preferably, in the step (4), the outer-coated iron sheet is provided with a lower grease injection hole and an upper grease outlet hole, the lower grease injection hole and the upper grease outlet hole are arranged along the height direction of the flange plate, and the lower grease injection hole is positioned below the upper grease outlet hole.
Preferably, in the step (5), the polyurethane sealant is injected through the lower grease injection hole after the polyurethane sealant is injected, and the injection is stopped until the polyurethane sealant flows out of the upper grease outlet hole, and the lower grease injection hole and the upper grease outlet hole are simultaneously blocked.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a method for performing anti-corrosion treatment on a connecting part by combining three measures, wherein the first measure is to set enough corrosion allowance for flange connection according to specific environment, the second measure is to adopt anti-corrosion coating, and the third measure is closed treatment.
Drawings
Fig. 1 is a schematic view of pouring polyurethane sealant outside the iron sheet.
Description of the main elements
In the figure: the prefabricated pipe pile comprises a prefabricated pipe pile 1, a main rib 2, an end plate 3, a flange plate 4, a plate 5, a connecting cylinder 6, a threaded through hole 7, a bolt 8, a rib plate 9, an outer-coated iron sheet 10 and polyurethane sealant 11.
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
In a preferred embodiment of the invention, the method for preventing corrosion of the lower structure connecting part of the pile-column integrated prefabricated bridge comprises the following steps:
(1) and carrying out corrosion allowance design on the lower structure connecting part.
(2) The flange 4 and the bolt 8 are corrosion coated before the pile is installed on site.
(3) After the pile is hoisted in place, the flange plate 4 is installed.
(4) Outer package iron sheet 10 of the peripheral installation of ring flange 4, outer package iron sheet 10 are located between two connection stake, and bolt 8 is located outer package iron sheet 10 inboard, and outer package iron sheet 10 is gone up to open has down annotates fat hole and goes out the fat hole, annotates down the fat hole and goes out the fat hole along the direction of height setting of ring flange 4 with last, and it is located the below in a fat hole to make a lower fat hole.
(5) The polyurethane sealant 11 is injected into the inner side of the outer clad iron sheet 10, when the polyurethane sealant 11 is injected, the polyurethane sealant 11 is injected through the lower grease injection hole, the injection is stopped until the polyurethane sealant 11 flows out of the upper grease outlet hole, and meanwhile, the lower grease injection hole and the upper grease outlet hole are blocked.
(6) And finishing the anticorrosion construction of the connecting part.
In the step (1), the calculation method of the corrosion allowance is as follows:
Δ＝K[(1-p)t1+(t-t1)]
in the formula (I), the compound is shown in the specification,
delta-steel structure single-side corrosion allowance, unit: mm.
K-steel structure single-side average corrosion rate, unit: mm/a, wherein the average corrosion speed of the single surface of the carbon steel can be taken by referring to a table 3.0.7-1 in technical Specification JTS 153-3-2007 for corrosion prevention of steel structures in harbor engineering, and can be determined by actual measurement on site if necessary; when low alloy steel is adopted, the values can be obtained by referring to the table 1, and the adjustment can be properly carried out according to the actual measurement result in the similar environment.
TABLE 1 average corrosion rate on one side of steel structure
The average corrosion speed in the table is suitable for the environmental condition that the pH value is 4-10, and the average corrosion speed is properly increased for the seriously polluted environment;
secondly, the river mouth area with clear salt content of water quality or the environment with high annual average temperature, large wave and large flow rate should be properly increased;
and thirdly, the bank side of the steel sheet pile can take values by referring to the area below the mud.
p-protection efficiency, unit: percent, wherein when the coating protection is adopted, the protection efficiency is 50 percent to 95 percent within the design service life of the coating; when cathodic protection is adopted, the protection efficiency can be taken as shown in table 2; when the combined protection of cathode protection and coating is adopted, the protection efficiency can reach 85-95 percent.
TABLE 2 cathodic protection efficiency
| Location of a body part | p(％) |
| Water level changing zone | 20≤p<90 |
| Underwater region | p≥90 |
t1Design age of corrosion protection measures, unit: a.
design service life of the t-steel structure, unit: a.
in the step (2), the corrosion coating of the flange plate 4 is carried out according to the following steps and requirements: 1) surface purification treatment is carried out to achieve the conditions of no oil and dryness; 2) secondary surface sand blasting to remove rust, reaching Sa2.5 grade, Rz30-70 μm; 3) two epoxy zinc-rich primers, wherein the thickness of each primer is more than 50 mu m; 4) two epoxy mica iron intermediate paints, wherein the thickness of each epoxy mica iron intermediate paint is more than 100 mu m; 5) two layers of fluorocarbon finish paint, wherein the thickness of each layer is more than 40 mu m; 6) and (6) repairing the welding seam.
The corrosion coating of the bolt 8 is carried out according to the following steps and requirements: 1) before screwing, the friction surface is subjected to surface treatment, oil and dirt are removed, and exposed parts of the bolt 8, the nut and the gasket are mechanically polished; 2) after the bolt 8 is finally screwed, coating epoxy zinc-rich primer for one 80 mu m on the exposed parts of the bolt 8, the nut and the washer; 3) and coating the whole with 120 mu m of epoxy thick paste paint.
Referring to fig. 1, in the present invention, a connection structure between two precast tubular piles 1 is as follows: the connecting structure comprises an end plate 3 and a flange plate 4; the end plate 3 is fixed at the end part of the precast tubular pile 1, a plurality of connecting cylinders 6 are inserted on the plate surface at intervals, two ends of each connecting cylinder 6 are positioned at two sides of the end plate 3, one end of each connecting cylinder is embedded into the precast tubular pile 1 from the end surface of the precast tubular pile 1, a connecting hole for the main rib 2 of the precast tubular pile 1 to penetrate is formed in one end of each connecting cylinder, the end surface of the other end of each connecting cylinder is fixedly connected with the end plate 3 in a welding mode, a threaded blind hole is formed in the end surface of the other end of each connecting cylinder, the threaded blind hole is communicated with the connecting hole, one; the flange plate 4 comprises two plate plates 5 and a rib plate 9, the two plate plates 5 are opposite and arranged at intervals and fixedly connected through the rib plate 9, a plurality of threaded through holes 7 are arranged on the plate surface of each plate 5 at intervals, each threaded through hole 7 is opposite to and communicated with a threaded blind hole, the flange plate 4 is fixedly connected on the end plate 3 in a mode that bolts 8 are simultaneously inserted into the threaded through holes 7 and the threaded blind holes in a threaded mode, and nut heads of the bolts 8 are positioned between the two plate plates 5; the outer clad iron sheet 10 is fixedly connected between the two plate plates 5 and is positioned outside the bolt 8. Through foretell connection structure, can make two precast tubular pile 1 quick and stable connection, improve the efficiency of construction.
The above description is intended to describe in detail the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the claims of the present invention, and all equivalent changes and modifications made within the technical spirit of the present invention should fall within the scope of the claims of the present invention.
Claims (6)
1. The method for preventing corrosion of the lower structure connecting part of the pile-column integrated prefabricated bridge is characterized by comprising the following steps of:
(1) carrying out corrosion allowance design on the lower structure connecting part;
(2) carrying out corrosion coating on the flange plate and the bolt before the pile is installed on site;
(3) after the pile is hoisted in place, a flange plate is installed;
(4) an outer-coated iron sheet is arranged on the periphery of the flange plate, the outer-coated iron sheet is positioned between the two connecting piles, and the bolt is positioned on the inner side of the outer-coated iron sheet;
(5) injecting polyurethane sealant to the inner side of the outer clad iron sheet;
(6) and finishing the anticorrosion construction of the connecting part.
2. The method for preventing corrosion of the lower structure connecting part of the pile-column integrated prefabricated bridge according to claim 1, wherein in the step (1), the calculation method of the corrosion allowance is as follows:
△＝K[(1-p)t1+(t-t1)]
in the formula (I), the compound is shown in the specification,
delta-single side corrosion allowance of steel structure, unit: the thickness of the film is mm,
k-steel structure single-side average corrosion rate, unit: mm/a of the total weight of the alloy,
p-protection efficiency, unit: percent by weight,
t1design age of corrosion protection measures, unit: a, the number of the first-time contact points is less than the number of the second-time contact points,
design service life of the t-steel structure, unit: a.
3. the method for preventing corrosion of the lower structure connecting part of the pile-column integrated prefabricated bridge, according to claim 1, is characterized in that in the step (2), the corrosion coating of the flange plate is performed according to the following steps and requirements: 1) surface purification treatment is carried out to achieve the conditions of no oil and dryness; 2) secondary surface sand blasting to remove rust, reaching Sa2.5 grade, Rz30-70 μm; 3) two epoxy zinc-rich primers, wherein the thickness of each primer is more than 50 mu m; 4) two epoxy mica iron intermediate paints, wherein the thickness of each epoxy mica iron intermediate paint is more than 100 mu m; 5) two layers of fluorocarbon finish paint, wherein the thickness of each layer is more than 40 mu m; 6) and (6) repairing the welding seam.
4. The method for preventing corrosion of the lower structure connecting part of the pile-column integrated prefabricated bridge according to claim 1, wherein in the step (2), bolt corrosion coating is performed according to the following steps and requirements: 1) before screwing, the friction surface is subjected to surface treatment, oil and dirt are removed, and exposed parts of a bolt, a nut and a gasket are mechanically polished; 2) after the bolt is finally screwed, coating epoxy zinc-rich primer for one 80 mu m on the exposed parts of the bolt, the nut and the washer; 3) and coating the whole with 120 mu m of epoxy thick paste paint.
5. The method for preventing corrosion of the lower structure connecting part of the pile-column integrated prefabricated bridge according to claim 1, wherein in the step (4), the outer-coated iron sheet is provided with a lower grease injection hole and an upper grease outlet hole, the lower grease injection hole and the upper grease outlet hole are arranged along the height direction of the flange plate, and the lower grease injection hole is positioned below the upper grease outlet hole.
6. The method for preventing corrosion of a lower structure connecting part of a pile-column integrated prefabricated bridge according to claim 5, wherein in the step (5), the polyurethane sealant is injected through the lower grease injection hole after the polyurethane sealant is injected, the injection is stopped until the polyurethane sealant flows out of the upper grease outlet hole, and the lower grease injection hole and the upper grease outlet hole are simultaneously blocked.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010757472.7A CN111893874A (en) | 2020-07-31 | 2020-07-31 | Anticorrosion method for lower structure connecting part of pile-column integrated prefabricated bridge |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010757472.7A CN111893874A (en) | 2020-07-31 | 2020-07-31 | Anticorrosion method for lower structure connecting part of pile-column integrated prefabricated bridge |
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| CN202010757472.7A Pending CN111893874A (en) | 2020-07-31 | 2020-07-31 | Anticorrosion method for lower structure connecting part of pile-column integrated prefabricated bridge |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1121915A (en) * | 1997-06-30 | 1999-01-26 | Taisei Corp | Connecting method of pile head |
| CN209585023U (en) * | 2018-12-11 | 2019-11-05 | 国网湖南省电力有限公司 | A kind of dry operation assembled spiral steel pile basis |
| CN111085414A (en) * | 2019-12-30 | 2020-05-01 | 中航百慕新材料技术工程股份有限公司 | Protection method of bolt for bridge and anti-corrosion bolt assembly |
| CN111305198A (en) * | 2020-03-23 | 2020-06-19 | 中铁二院成都勘察设计研究院有限责任公司 | Connecting structure of prestressed concrete pipe pile and construction method thereof |
-
2020
- 2020-07-31 CN CN202010757472.7A patent/CN111893874A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1121915A (en) * | 1997-06-30 | 1999-01-26 | Taisei Corp | Connecting method of pile head |
| CN209585023U (en) * | 2018-12-11 | 2019-11-05 | 国网湖南省电力有限公司 | A kind of dry operation assembled spiral steel pile basis |
| CN111085414A (en) * | 2019-12-30 | 2020-05-01 | 中航百慕新材料技术工程股份有限公司 | Protection method of bolt for bridge and anti-corrosion bolt assembly |
| CN111305198A (en) * | 2020-03-23 | 2020-06-19 | 中铁二院成都勘察设计研究院有限责任公司 | Connecting structure of prestressed concrete pipe pile and construction method thereof |
Non-Patent Citations (3)
| Title |
|---|
| 中交天津港湾工程研究院有限公司: "《海港工程钢结构防腐蚀技术规范》", 30 April 2008, 人民交通出版社 * |
| 孙兵等: "《基础工程》", 31 July 2017, 电子科技大学出版社 * |
| 靳晓勇: "《建设工程施工技术交底记录细节解析与典型实例 钢结构工程》", 31 August 2013, 华中科技大学出版社 * |
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Application publication date: 20201106 |