CN114960475A - Concrete guardrail collision-facing surface steel bar corrosion repairing and reinforcing method - Google Patents
Concrete guardrail collision-facing surface steel bar corrosion repairing and reinforcing method Download PDFInfo
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- CN114960475A CN114960475A CN202210624666.9A CN202210624666A CN114960475A CN 114960475 A CN114960475 A CN 114960475A CN 202210624666 A CN202210624666 A CN 202210624666A CN 114960475 A CN114960475 A CN 114960475A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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- 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
- E01D19/10—Railings; Protectors against smoke or gases, e.g. of locomotives; Maintenance travellers; Fastening of pipes or cables to bridges
- E01D19/103—Parapets, railings ; Guard barriers or road-bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)
Abstract
The invention relates to the technical field of bridge reinforcement, in particular to a concrete guardrail collision face steel bar corrosion repairing and reinforcing method, which adopts an ultra-thin ultra-high performance concrete bridge collision face template formed by pressing in a factory to repair the corrosion damage of the collision face of a guardrail, utilizes the original guardrail steel bar framework to fix the template, adopts a mud jacking technology to fill gaps, and utilizes the ultra-high mechanical property and structural property of ultra-high performance concrete to greatly improve the anti-collision capability and durability of a concrete anti-collision guardrail while ensuring the repairing effect.
Description
Technical Field
The invention relates to the technical field of bridge reinforcement, in particular to a method for repairing and reinforcing corrosion of a steel bar on a collision-facing surface of a concrete guardrail.
Background
Bridge concrete anticollision barrier plays the important function of protection driving safety as the important component of bridge floor system, and its meets the line type, the angle of hitting the face and all need strictly satisfy the regulation requirement, but in daily use, north area bridge often becomes the bridge several years later, and the guardrail meets and hits the face the latter half and just can appear the concrete part that the corrosion of more regular vertical reinforcement leads to and drop. The reason is that the concrete strength of the bridge guardrail is low in mark and weak in anti-permeability performance, and melted snow containing deicing salt is accumulated at the slope foot of the collision-facing surface, so that chloride ions permeate and adhere to the reinforcing steel bars to corrode the reinforcing steel bars and burst the concrete. If the damage continues to develop, the durability and the anti-collision performance of the anti-collision guardrail are adversely affected.
At present, a local repairing method is generally adopted for treating the diseases, the steel bar is subjected to rust removal treatment, polymer mortar is used for repairing concrete, and then surface anticorrosive paint is coated; however, the following problems still exist with this repair solution: (1) the mortar repairing surface adopts a manual greasing mode, and the thin layer is easy to fall off after being repaired; (2) the construction surface is uneven, so that the apparent quality is influenced; (3) the collision-facing surface of the guardrail is easily scratched and influenced by vehicles, and the anticorrosive paint is easily damaged. Therefore, a more reasonable repairing and reinforcing method is urgently needed to be designed.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a concrete guardrail collision face steel bar corrosion repairing and reinforcing method.
In order to realize the purpose, the process for repairing and reinforcing the corrosion of the steel bar on the collision-facing surface of the concrete guardrail specifically comprises the following steps;
(1) according to the vertical height of the template, taking the elastic line on the surface of the crash barrier to be repaired as a grooving line, and grooving the surface along the grooving line;
(2) chiseling damaged and loose concrete within the range of the cutting groove line;
(3) derusting the corroded steel bar, welding a screw rod along the derusted steel bar, installing an inner nut on the screw rod, and respectively welding two ends of the screw rod on the guardrail steel bar framework;
(4) the template is assembled on the collision-facing surface of the guardrail in a trial manner, and the inner nut is adjusted to ensure that the outer surface of the template is level and consistent with the surface of the original concrete;
(5) disassembling the template, brushing an interface agent on the concrete surface, and smearing epoxy mortar sealing material at the edge of a tangent line;
(6) reinstalling the template, screwing the outer nut, tightly attaching the template and the guardrail, and cleaning mortar overflowing from the joint;
(7) installing templates one by one according to the steps (3) to (6), and brushing glue on the joints of the templates;
(8) after the epoxy mortar is firmly bonded, mounting a grouting nozzle and a grout outlet nozzle at a grouting hole and a grout outlet hole of the template respectively, grouting hole by hole from inside to outside, and plugging the grout outlet hole after the grout is discharged from the corresponding grout outlet hole;
(9) and (4) removing the grouting nozzle after grouting is finished and the grout is cured, cleaning the outer surface, and repairing and reinforcing the corrosion of the steel bar on the collision-facing surface of the concrete guardrail.
Preferably, the depth of the notch in the step (1) is 1.5 cm.
Preferably, in the step (2), the groove is cut on the damage repairing edge as a chiseling boundary, and the chiseling depth is consistent within 5cm of the inner side of the edge of the cutting line; chiseling a reinforcement expansion area of the anti-collision guardrail to be repaired until the reinforcement leaks out; and (5) chiseling and exposing bones in other areas, wherein the chiseling depth is more than or equal to 2 cm.
Preferably, an inner gasket is padded between the inner nut and the inner surface of the template, and an outer gasket is padded between the outer nut and the outer surface of the template.
Preferably, the outline dimension of the template is consistent with the dimension of the guardrail to be repaired, the outer surface of the template is a smooth surface, the inner surface of the template is provided with latticed embossing, the thickness of the template is 1cm, and the length of the template is 1 m.
Preferably, the position that the template surface is close to all around is provided with four bolt holes, and the mud jacking hole sets up with going out the thick liquid hole relatively, and the concatenation adopts L type overlap joint mode between the different templates, and the overlap joint face is smeared the structure and is glued the closed gap.
Preferably, the template is formed by pressing concrete by adopting ultra-high performance concrete, the compressive strength, the breaking strength and the elastic modulus of the ultra-high performance concrete respectively reach more than 100MPa, 12MPa and 50GPa, the chloride ion permeability coefficients are respectively 1/50 and 1/30 of common concrete and high performance concrete, and the template is very suitable for external protection of the easily damaged area of the crash barrier.
Compared with the prior art, the invention has the following beneficial effects:
(1) the ultra-thin concrete template with ultra-high performance is used as an outer protective surface, the chlorine ion diffusion resistance is improved by 50 times compared with that of common concrete, mechanical indexes such as compressive strength and the like are improved by multiple times, and the defects of corrosion and damage of the collision-facing surface of the guardrail can be effectively solved and the durability is improved;
(2) the adopted template has simple structure, can be subjected to industrial standard processing, has good guarantee on the appearance quality and the stress performance, and can obviously improve the section occlusion capability by arranging the latticed raised lines on the inner side of the template;
(3) the method does not need large-scale machines and equipment during site construction, the ultra-thin concrete template with ultra-high performance has reliable quality, is convenient to disassemble, assemble and construct, is connected with the original structural steel bars through bolts, fully utilizes the original structural strength, does not need to install auxiliary facilities such as template supports and the like, and has clean and tidy construction site;
(4) the fine adjustment and positioning of the template can be conveniently adjusted by adjusting the inner bolt and the outer bolt, and the situations of repairing seams, dislocation and the like are avoided; through the mode of bolted connection and mud jacking processing, can make template and former concrete closely paste, guarantee the anticollision effect, keep away the interface gap.
(5) The method can be used for durability repair and reinforcement of the collision-facing surface of the guardrail, and can be conveniently popularized to other repair scenes of concrete damage by adopting different template types.
Drawings
FIG. 1 is a schematic view of a concrete guardrail of the present invention showing a common damage on the head-on collision surface;
FIG. 2 is a schematic view of the damaged surface chiseling of the guardrail of the present invention;
FIG. 3 is a schematic view of the mounting screw and the inner nut of the present invention;
FIG. 4 is a schematic view of the present invention illustrating the installation of a fixed form;
FIG. 5 is an enlarged view of a portion of FIG. 4;
FIG. 6 is a schematic view of the front of the repair of the present invention;
FIG. 7 is a schematic view of the template configuration of the present invention;
in the figure, 1, a groove line is cut; 2. chiseling the boundary; 3. a screw; 4. an inner nut; 5. an inner gasket; 6, an outer gasket; 7. an outer nut; 8. a template; 9. a guardrail steel reinforcement framework; 10. corroding the steel bars; 11. epoxy mortar sealing material; 12. a slurry outlet; 13. grouting holes; 14. bolt holes; 15. an interior surface of the template; 16. the exterior surface of the form.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
Example (b):
the template 8 that this embodiment adopted adopts the concrete to adopt the super high performance concrete to press and form, and 8 positions that the surface of template is close to all around are provided with four bolt holes 14, and mud jacking hole 13 sets up with grout outlet 12 relatively, and the concatenation adopts L type overlap joint mode between the different templates, and the overlap joint face is smeared the structure and is glued and is sealed the gap, and its concrete parameter and performance are shown as table 1 and table 2 respectively.
Table 1: template parameters
Table 2: mechanical property of UHPC200 material
| Compressive strength | 170～230MPa |
| Bending strength | 30～60MPa |
| Energy at break | 20000～40000J/m 2 |
| Modulus of elasticity | 54～60GPa |
The concrete guardrail collision face reinforcing steel bar corrosion repairing and reinforcing process specifically comprises the following steps;
(1) according to the vertical height of the template 8, taking the elastic line on the surface of the crash barrier to be repaired as a grooving line 1, and grooving the surface along the grooving line 1, wherein the grooving depth is 1.5 cm;
(2) chiseling damaged and loose concrete in the range of a cutting groove line, cutting grooves on the damaged and repaired edge to be used as a chiseling boundary 2, and chiseling the concrete to be consistent in depth in the range of 5cm inside the cutting groove line; chiseling a reinforcement expansion area of the anti-collision guardrail to be repaired until the reinforcement leaks out; chiseling and exposing bones in other areas, wherein the chiseling depth is more than or equal to 2 cm;
(3) derusting the corrosion steel bar 10, welding a screw rod 3 along the derusted steel bar, installing an inner nut 4 on the screw rod 3, and respectively welding two ends of the screw rod 3 on a guardrail steel bar framework 9;
(4) the template 8 is assembled on the face of the guardrail facing the collision, the inner nut 4 is adjusted, and an inner gasket 5 is arranged between the inner nut 4 and the inner surface 15 of the template to ensure that the outer surface 16 of the template is level and consistent with the surface of the original concrete;
(5) disassembling the template 8, brushing an interface agent on the concrete surface, and smearing epoxy mortar sealing material 11 at the edge of a tangent line;
(6) reinstalling the template 8, screwing the outer nut 7, tightly attaching the template 8 to the guardrail, padding an outer gasket 6 between the outer nut 7 and the outer surface 16 of the template, and cleaning excessive mortar at the joint;
(7) installing templates 8 one by one according to the steps (3) to (6), and brushing glue on the seams of the templates;
(8) after the epoxy mortar is firmly bonded, mounting a grouting nozzle and a grout outlet nozzle at a grouting hole 13 and a grout outlet hole 12 of the template 8 respectively, grouting hole by hole from inside to outside, and plugging the grout outlet hole 12 after grout is discharged from the corresponding grout outlet hole 12;
(9) and (4) removing the grouting nozzle after grouting is finished and the grout is cured, cleaning the outer surface, and repairing and reinforcing the corrosion of the steel bar on the collision-facing surface of the concrete guardrail.
The results of the durability comparison of the present example with respect to ordinary concrete, ultra-high performance concrete and UHPC are shown in Table 3.
Table 3: durability comparison of ordinary concrete, high-performance concrete and UHPC
| Performance of | Ordinary concrete | Ultra-high performance concrete | UHPC |
| Diffusion of chloride ions (10) -12 m 2 /s) | 1.1 | 0.6 | 0.02 |
| Carbonization depth (mm) | 10 | 2 | 0 |
| Amount of freeze-thaw exfoliation (g/m) 2 ) | >1000 | 900 | 7 |
| Corrosion coefficient | 4.0 | 2.8 | 1.3 |
While the invention has been described in detail with reference to specific embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. A concrete guardrail collision surface reinforcing steel bar corrosion repairing and reinforcing method is characterized by comprising the following steps;
(1) according to the vertical height of the template, taking the elastic line on the surface of the crash barrier to be repaired as a grooving line, and grooving the surface along the grooving line;
(2) chiseling damaged and loose concrete within the range of the cutting groove line;
(3) derusting the corroded steel bar, welding a screw rod along the derusted steel bar, installing an inner nut on the screw rod, and respectively welding two ends of the screw rod on the guardrail steel bar framework;
(4) the template is assembled on the collision-facing surface of the guardrail in a trial manner, and the inner nut is adjusted to ensure that the outer surface of the template is level and consistent with the surface of the original concrete;
(5) disassembling the template, brushing an interface agent on the concrete surface, and smearing epoxy mortar sealing material at the edge of a tangent line;
(6) reinstalling the template, screwing the outer nut, tightly attaching the template and the guardrail, and cleaning mortar overflowing from the joint;
(7) installing templates one by one according to the steps (3) to (6), and brushing glue on the joints of the templates;
(8) after the epoxy mortar is firmly bonded, mounting a grouting nozzle and a grout outlet nozzle at a grouting hole and a grout outlet hole of the template respectively, grouting hole by hole from inside to outside, and plugging the grout outlet hole after the grout is discharged from the corresponding grout outlet hole;
(9) and (4) removing the grouting nozzle after grouting is finished and the grout is cured, cleaning the outer surface, and repairing and reinforcing the corrosion of the steel bar on the collision-facing surface of the concrete guardrail.
2. The method for repairing and reinforcing the corrosion of the steel bar on the impact surface of the concrete guardrail according to claim 1, wherein the depth of the cutting groove in the step (1) is 1.5 cm.
3. The concrete guardrail collision face steel bar corrosion repairing and reinforcing method as claimed in claim 2, wherein in the step (2), the damaged repairing edge is notched to serve as a chiseling boundary, and the depth of the notch line edge is uniformly chiseled within 5cm of the inner side of the notch line edge; chiseling a reinforcement expansion area of the anti-collision guardrail to be repaired until the reinforcement leaks out; and (5) chiseling and exposing bones in other areas, wherein the chiseling depth is more than or equal to 2 cm.
4. The method for repairing and reinforcing the rusted steel bar at the impact surface of the concrete guardrail as claimed in claim 3, wherein an inner gasket is padded between the inner nut and the inner surface of the template, and an outer gasket is padded between the outer nut and the outer surface of the template.
5. The method for repairing and reinforcing the corrosion of the steel bar on the impact surface of the concrete guardrail as claimed in claim 4, wherein the template is formed by pressing concrete and ultra high performance concrete UHPC, the external dimension of the template is consistent with the dimension of the guardrail to be repaired, the external surface of the template is a smooth surface, the internal surface of the template is provided with grid-shaped embossings, the thickness of the template is 1cm, and the length of the template is 1 m.
6. The method for repairing and reinforcing the corrosion of the steel bar on the head-on collision surface of the concrete guardrail according to claim 5, wherein four bolt holes are formed in the positions, close to the periphery, of the surfaces of the templates, the grout pressing holes and the grout outlet holes are arranged oppositely, the different templates are spliced in an L-shaped lap joint mode, and structural glue is applied to the lap joint surfaces to seal gaps.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210624666.9A CN114960475A (en) | 2022-06-02 | 2022-06-02 | Concrete guardrail collision-facing surface steel bar corrosion repairing and reinforcing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210624666.9A CN114960475A (en) | 2022-06-02 | 2022-06-02 | Concrete guardrail collision-facing surface steel bar corrosion repairing and reinforcing method |
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| CN114960475A true CN114960475A (en) | 2022-08-30 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205314534U (en) * | 2016-01-29 | 2016-06-15 | 湖州职业技术学院 | Frame post can't harm drawknot steel form structure |
| CN108755455A (en) * | 2018-06-12 | 2018-11-06 | 北京特希达交通勘察设计院有限公司 | The restorative procedure of Collison fence for bridge |
| WO2020186757A1 (en) * | 2019-03-21 | 2020-09-24 | 华南理工大学 | Ultra-high-performance concrete combined permanent template and application thereof |
| CN214362868U (en) * | 2020-12-14 | 2021-10-08 | 宁波市交通规划设计研究院有限公司 | Concrete guardrail heightening device |
| CN114411596A (en) * | 2022-02-25 | 2022-04-29 | 北京固瑞恩科技有限公司 | Concrete anti-collision pier repairing method |
| CN216640449U (en) * | 2021-11-02 | 2022-05-31 | 湖南康飞建设工程有限公司 | Combined module supporting structure for flood bank protection slope |
-
2022
- 2022-06-02 CN CN202210624666.9A patent/CN114960475A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205314534U (en) * | 2016-01-29 | 2016-06-15 | 湖州职业技术学院 | Frame post can't harm drawknot steel form structure |
| CN108755455A (en) * | 2018-06-12 | 2018-11-06 | 北京特希达交通勘察设计院有限公司 | The restorative procedure of Collison fence for bridge |
| WO2020186757A1 (en) * | 2019-03-21 | 2020-09-24 | 华南理工大学 | Ultra-high-performance concrete combined permanent template and application thereof |
| CN214362868U (en) * | 2020-12-14 | 2021-10-08 | 宁波市交通规划设计研究院有限公司 | Concrete guardrail heightening device |
| CN216640449U (en) * | 2021-11-02 | 2022-05-31 | 湖南康飞建设工程有限公司 | Combined module supporting structure for flood bank protection slope |
| CN114411596A (en) * | 2022-02-25 | 2022-04-29 | 北京固瑞恩科技有限公司 | Concrete anti-collision pier repairing method |
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