CN114411596A - Concrete anti-collision pier repairing method - Google Patents
Concrete anti-collision pier repairing method Download PDFInfo
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- CN114411596A CN114411596A CN202210178039.7A CN202210178039A CN114411596A CN 114411596 A CN114411596 A CN 114411596A CN 202210178039 A CN202210178039 A CN 202210178039A CN 114411596 A CN114411596 A CN 114411596A
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- 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
- E01F15/00—Safety arrangements for slowing, redirecting or stopping errant vehicles, e.g. guard posts or bollards; Arrangements for reducing damage to roadside structures due to vehicular impact
- E01F15/02—Continuous barriers extending along roads or between traffic lanes
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Abstract
The invention discloses a concrete anti-collision pier repairing method, in particular to the field of concrete anti-collision pier repairing, which comprises an anti-collision pier, a protective plate, a sealing slurry and a polymer slurry, wherein the protective plate and the anti-collision pier are bonded by the polymer slurry to form enough bonding strength, the protective plate and the side surface and the bottom surface edge of the anti-collision pier are sealed by the sealing slurry to form a cavity to ensure no slurry leakage, then the cavity is filled with the grouting material, the protective plate is firmly fixed at the outer side of the anti-collision pier through the bridging action of the hardened grouting material, because the protective plate is made of an ultra-high performance concrete material, the compressive strength and the bending strength are very high, the thickness of the protective plate can be controlled within 10-20mm, the weight is light, the carrying is convenient, the protective plate also has ultra-high chlorine ion permeation resistance and freeze-thaw resistance, so that the maintenance period of the protected anti-collision pier is greatly prolonged, the frequency is reduced, the traffic control time required by maintenance is greatly shortened, and the economic benefit and the social benefit are remarkable.
Description
Technical Field
The invention relates to the field of concrete anti-collision pier repair, in particular to a concrete anti-collision pier repair method.
Background
The anti-collision piers are also called anti-collision guardrails, and are road surface facilities which are arranged at two sides or the center of a road and used for preventing vehicles from passing through and rushing out of a road surface area, a plurality of anti-collision piers are formed by pouring concrete, reinforcing bars are arranged for increasing the anti-collision grade, investigation finds that after the concrete anti-collision piers in northern areas are used for several years, the concrete anti-collision piers are often stripped and damaged within 20cm of the root of the anti-collision piers, the reinforcing bars are exposed seriously, the anti-collision grade is reduced, and the attractiveness is seriously reduced, the reason for the investigation finds that deicing salt and snow melting agent sprayed in snowy days in winter contain a large amount of corrosive ions and chloride ions, the vehicle can be sputtered on the anti-collision piers when driving, the corrosive ions and the chloride ions can slowly permeate into the concrete due to the existence of a large amount of capillary holes on the surface and the inside of the concrete, the chloride ions can damage a reinforcing bar passivation film to cause corrosion, and the concrete protection layer can be expanded from the inside by the reinforcing bars, on the other hand, the anti-collision pier also bears the freeze-thaw cycle damage effect, when the environmental temperature is reduced to below the freezing point, the adsorbed free water in the capillary pores of the concrete anti-collision pier can be frozen, the volume of the water in the process of converting the water into ice is increased by 11%, the expansion process is an expansion process, and if the water is frozen again after thawing, the expansion is continuously increased, and finally the concrete is likely to be peeled and damaged.
In view of the above-mentioned damage problems suffered by crash piers, the current solution is to perform spot repairs by a large number of road workers, and the following problems exist: firstly, traffic control needs to be set on a construction site, so that traffic jam is caused, and the driving efficiency is reduced, so that the hidden cost expenditure is very high; secondly, workers are required to carry a large amount of building materials on site, construction efficiency is low, cost is high, maintenance conditions are difficult to guarantee, and repairing effect is not ideal; thirdly, the appearance difference between the repaired position and the unrepaired position is obvious, the whole color is mottled, and the attractiveness is poor; and fourthly, the repairing position cannot solve the problems fundamentally, the problems of reinforcing steel bar corrosion, freeze-thaw damage and tail gas corrosion also exist, and the repairing is required to be continued even if the service life is not reached.
In order to solve the problem, technical workers propose to adopt UHPC with the thickness of 3 cm as a template for in-situ pouring of the anti-collision pier, and the UHPC template and the anti-collision pier form a whole along with the solidification and hardening of the anti-collision pier, and the scheme can solve the problem of the degradation of the cast-in-place concrete anti-collision pier, but has the following problems: firstly, the template is too thick and heavy, the cost is high, the carrying is inconvenient and the template is easy to break; secondly, a solution for protecting concrete by casting on-site is not provided; and thirdly, for the damaged concrete anti-collision pier, a repair scheme is not provided.
Market research finds that someone adopts a protective plate with the thickness of 3-5cm to be externally attached to strengthen the protection of the anti-collision pier, and the specific scheme is as follows: the protection plate is of a split structure and consists of an upper plane plate and a lower cambered plate, a mortar leveling layer is smeared between the upper plane plate and the anti-collision pier, and then a metal long bolt penetrates through the protection plate and is screwed into a threaded sleeve in the anti-collision pier for fixing; and the lower cambered surface plate is bonded with the cambered surface at the bottom of the anti-collision pier by plastering mortar. The problem with this solution is two-fold: firstly, the upper plane plate is fixed by bolts, exposed bolt heads are gradually reduced due to corrosion, and finally the fixing effect of the upper plane plate and the anti-collision pier cannot be exerted, so that the upper plane plate falls off to cause great safety threat to road traveling; secondly, adopt the mortar to bond the mode unreliable between cambered plate and the anticollision mound down, along with the live time extension, the mortar adhesion loses because of various reasons, and cambered plate can drop down equally and cause huge threat for the road surface driving.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a concrete anti-collision pier repairing method.
In order to achieve the purpose, the invention adopts the following technical scheme:
a concrete anti-collision pier repairing method comprises anti-collision piers, protection plates, sealing slurry and polymer mortar, and the concrete repairing process comprises the following steps:
s1, preprocessing the anti-collision pier;
s2, after the pretreatment is finished, uniformly paving the junction of the to-be-repaired surface of the anti-collision pier and the road surface by using quick-hardening type sealing slurry;
s3, adopting rapid hardening polymer mortar to be accumulated at a lower position in the middle of the sticking surface of the protection plate, wherein the thickness of the rapid hardening polymer mortar is larger than the designed width of a gap between the protection plate and the anti-collision pier;
s4, attaching the protection plate to the anti-collision pier in parallel, enabling the bottom of the protection plate to fall into the uniformly laid quick-hardening sealing slurry in a base slurry mode, and adjusting the gap between the protection plate and the anti-collision pier to be uniform so as to meet grouting conditions;
s5, sealing the edge of the gap between the protection plate and the anti-collision pier by using the quick-hardening type sealing slurry, ensuring that the quick-hardening type sealing slurry is not exposed outside the gap and not influencing the installation of the next protection plate;
s6, strongly bonding the protection plate and the anti-collision pier by using the quick-hardening polymer mortar to prevent the protection plate from expanding outwards in the subsequent grouting process;
s7, adopting the high-fluidity rapid-hardening grouting material to quickly grout a gap between the protection plate and the anti-collision pier, wherein the grouting mode is a manual pouring or mechanical pressure grouting mode, the grouting position needs to be fixed in the grouting process, the high-fluidity rapid-hardening grouting material is poured from one side to the other side, so that the internal gas is conveniently discharged, and a one-time grouting or multiple grouting mode can be adopted;
s8, after the high-fluidity fast-hardening grouting material between the protection plates and the anti-collision piers is initially set, carrying out installation operation on the next protection plate;
s9, after grouting is completed, the anti-collision pier and the high-fluidity fast-hardening grouting material in the middle of the protection plate are condensed and hardened to generate a bridging effect, one side of the high-fluidity fast-hardening grouting material is tightly combined with the anti-collision pier, and the other side of the high-fluidity fast-hardening grouting material is combined with the inner rough surface of the protection plate, so that the protection plate is firmly protected on the outer side of the anti-collision pier to play a role in protection;
and S10, after 1-2 hours from grouting, the protection plate can be completely fixed on the outer side of the anti-collision pier to form a whole.
Preferably, the thickness of the floor is laid in step S2 to prevent the bottom from leaking water after the protective plate is attached.
By adopting the technical scheme: in the laying process, the waterproof is taken as a standard, so that the slurry leakage and the water leakage can be avoided in the grouting process, and the bonding strength after the coagulation and the hardening can be ensured.
Preferably, when the protection plate is attached to the anti-collision pier in parallel in step S3, the fast-hardening polymer mortar may be attached to the bottom of the anti-collision pier, so as to ensure that a sufficient adhesive force is formed between the anti-collision pier and the protection plate.
Preferably, in the installation process in step S5, if only one side edge is exposed, the exposed side edge is sealed with a quick-hardening sealing slurry, and the gap between the other side edge and the side edge of the upper protection plate is filled with a quick-hardening polymer slurry.
By adopting the technical scheme: the cavity is formed between the protection plate and the anti-collision pier, and other side surfaces and the bottom surface do not leak water or slurry except the gap of the top surface.
Preferably, the time for forming the strength of the fast-hardening polymer mortar in step S3 is not later than the final setting time of the fast-hardening sealing paste.
Preferably, in the step S8, before the next fender panel construction, the sealing paste exposed to the outside at the bottom of the fender panel is cleaned.
Preferably, the step of preprocessing in step S1 specifically includes:
s1.1, damaging a concrete protection layer on one side of an anti-collision pier facing a traffic lane due to freeze-thaw cycle damage or steel bar corrosion, and firstly, removing a damaged concrete base layer on the surface to expose a fresh concrete base surface;
s1.2, brushing a high-permeability steel bar rust inhibitor on the surface of the anti-collision pier, on which the steel bars are not exposed, and performing subsequent operation after the steel bar rust inhibitor permeates into the surface of the steel bars;
s1.3, for the concrete anti-collision pier with exposed steel bars, firstly, a damaged concrete base layer is removed, corrosion on the surfaces of the steel bars is removed in a physical polishing or chemical reagent cleaning mode, after the surfaces of the steel bars are dried, high-rust-resistance mortar is used for repairing the positions near the steel bars and the surfaces of the anti-collision piers, and after the high-rust-resistance mortar in repairing is hardened, follow-up work is carried out.
By adopting the technical scheme: because the rust inhibitor is adopted to treat the vicinity of the reinforcing steel bars, the corrosion condition of the reinforcing steel bars inside the concrete anti-collision pier is greatly improved, and the anti-rust effect is greatly improved. The outer protection plate can be made of ultra-high performance concrete materials, the thickness dimension is controlled to be 10-20mm, and the ultra-high anti-chlorine ion penetration and anti-freeze thawing performance is achieved. The two aspects interact with each other, so that the maintenance-free period of the concrete anti-collision pier is prolonged by 10-15 years, the maintenance cost is greatly reduced, and the social and economic cost brought by traffic control in the maintenance process is reduced.
The invention has the beneficial effects that:
1. the protection plate made of the ultra-high performance concrete has very high compactness, so that the capability of resisting deicing salt, a snow melting agent and corrosive gas is greatly improved, the maintenance-free period is greatly prolonged, the traffic control time required by maintenance is greatly shortened, and the social benefit is very obvious.
2. The protection plate made of the ultra-high performance concrete does not need to be repaired during use, so that the problem that the color of a repaired position is inconsistent with that of an unrepaired position is solved, and the attractiveness is guaranteed.
3. The anti-corrosion pier has the advantages that the rusted parts are cleaned, the anti-corrosion capacity is improved, meanwhile, the outer part is isolated by the ultra-high performance concrete protection plate, the resistance of the anti-corrosion pier to steel bar corrosion, freeze-thaw cycle damage and tail gas erosion is greatly improved through two-aspect operation, and the damage problem is fundamentally solved.
4. The protective plate is produced in a prefabricated part factory, quick-hardening sealing slurry and high-mobility quick-hardening grouting material are adopted in field installation, only 1-2 hours are needed from construction to complete curing, watering maintenance is not needed, efficiency is high, the maintenance-free period of the anti-collision pier is prolonged to 10-15 years after the protective plate is installed, compared with field repair, the maintenance frequency of the anti-collision pier in the whole life cycle is greatly reduced, the effect is good, and the overall cost is low.
5. The protective plate made of the ultra-high performance concrete has extremely high bending strength and compressive strength, and the thickness can be controlled within the range of 10mm-20mm because the deformation constraint effect on the cast-in-place concrete is not required to be considered, so that the material cost is reduced, and the carrying weight is reduced.
6. The protection plate can be used for repairing damaged concrete anti-collision piers and can also be used for protecting new concrete anti-collision piers, and the application scene is wider.
Drawings
FIG. 1 is a diagram of a structure of a split structure of an anti-collision pier and a protection plate in the embodiment of the invention;
fig. 2 is an overall structure diagram of the crash pier and the protection plate in the embodiment of the invention.
Illustration of the drawings: 1. anti-collision piers; 2. a protection plate; 3. sealing slurry; 4. a polymer mortar.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
As shown in fig. 1-2, a concrete anti-collision pier repairing method comprises an anti-collision pier 1, a protection plate 2, a sealing slurry 3 and a polymer mortar 4, wherein the concrete repairing process comprises the following steps:
firstly, a concrete protective layer is damaged on one side facing a traffic lane due to the freeze-thaw cycle damage or the corrosion problem of reinforcing steel bars of the anti-collision pier 1, firstly, a damaged concrete base layer on the surface is removed, and a fresh concrete base layer is exposed;
then, brushing a high-permeability steel bar rust inhibitor on the surface of the anti-collision pier 1 without exposed steel bars, and performing subsequent operation after the steel bar rust inhibitor permeates to the surface of the steel bars;
for the concrete anti-collision pier 1 with exposed steel bars, firstly, a damaged concrete base layer is removed, corrosion on the surface of the steel bars is removed by adopting a physical polishing or chemical reagent cleaning mode, after the surface of the steel bars is dried, high-corrosion-resistance mortar is used for repairing the positions near the steel bars and the surface of the anti-collision pier 1, and subsequent work is carried out after the high-corrosion-resistance mortar in repairing is hardened.
Uniformly paving the junction of the to-be-repaired surface of the anti-collision pier 1 and the road surface by using the quick-hardening type sealing slurry 3, wherein the thickness is determined to prevent the bottom of the anti-collision pier 2 from leaking water after the anti-collision pier 2 is attached, and the anti-collision pier 2 is made of an ultrahigh-performance concrete material and has very high chloride ion permeation resistance and freeze-thaw resistance;
and step three, accumulating the fast-hardening polymer mortar 4 in the lower middle part of the sticking surface of the protection plate 2, wherein the fast-hardening polymer mortar 4 can be replaced by an organic resin material, the thickness of the fast-hardening polymer mortar is larger than the designed width of a gap between the protection plate 2 and the anti-collision pier 1, the time for forming the strength of the fast-hardening polymer mortar 4 is not later than the final setting time of the fast-hardening sealing slurry 3, when the protection plate 2 is stuck to the anti-collision pier 1 in parallel, the fast-hardening polymer mortar 4 can be stuck to the bottom of the anti-collision pier 1, and the bonding force with enough strength between the anti-collision pier 1 and the protection plate 2 is ensured.
And step four, attaching the protection plate 2 to the anti-collision pier 1 in parallel, enabling the bottom of the protection plate 2 to fall into the fast-hardening type sealing slurry 3 which is uniformly laid in a slurry setting mode, and adjusting the gap between the protection plate 2 and the anti-collision pier 1 to be uniform so as to meet grouting conditions.
Step five, referring to fig. 2, sealing a side gap between the protection plate 2 and the anti-collision pier 1 by using a quick-hardening type sealing slurry 3, ensuring that the quick-hardening type sealing slurry 3 is not exposed outside, and not influencing the installation of the next protection plate 2, if only one side is exposed in the installation process, sealing the exposed side by using the quick-hardening type sealing slurry 3, wherein the quick-hardening type sealing slurry 3 can be replaced by a polymer mortar 4, and the gap between the other side and the side of the previous protection plate 2 is filled with the polymer mortar 4;
and step six, under the strong bonding of the rapid hardening polymer mortar 4 to the protection plate 2 and the anti-collision pier 1, the protection plate 2 is firmly fixed on the anti-collision pier 1, and cannot move up and down or move left and right in the front and back directions, so that the protection plate is prevented from expanding outwards in the subsequent grouting process.
Step seven, adopt the rapid hardening type grout material of big mobility to carry out quick grout to the gap between guard plate 2 and the anticollision mound 1, the grout mode is that the manual work is emptyd or mechanical pressure grout mode, the grout position is fixed to the grout process needs to be guaranteed, the rapid hardening type grout material of big mobility is poured into from one side toward the opposite side, make things convenient for the discharge of inside gas, can adopt once grout or grout mode many times, adopt the rapid hardening type grout material of big mobility to grout once, the turnover of equipment can be accelerated by a wide margin in the operation like this, and work efficiency is improved.
Step eight, after the grouting material between the protection plate 2 and the anti-collision pier 1 is initially set, cleaning the sealing slurry 3 exposed to the outside at the bottom of the protection plate 2, and performing installation operation on the next protection plate 2.
Step nine, after the grouting is finished, the grouting material in the middle of the anti-collision pier 1 and the protection plate 2 is condensed and hardened to generate a bridging effect, one side of the anti-collision pier is tightly combined with the anti-collision pier 1, and the other side of the anti-collision pier is bonded with the inner rough surface of the protection plate 2, so that the protection plate 2 is firmly protected outside the anti-collision pier 1, and a protection effect is achieved.
Step ten, after 1-2 hours from the start of grouting, the protection plate 2 can be completely fixed on the side surface of the anti-collision pier 1 facing the traffic lane to form a whole.
After through the above-mentioned operation, can carry out inside restoration and outer protection to damaged concrete anticollision mound 1, because adopt near rust inhibitor handles the reinforcing bar, the corrosion condition of the inside reinforcing bar of concrete anticollision mound 1 improves greatly, and the antirust effect improves greatly, and outer guard plate 2 adopts ultra high performance concrete material to make, has very high chloridion resistance infiltration, freeze-thaw resistance. The two aspects interact with each other, so that the maintenance-free period of the concrete anti-collision pier 1 can be prolonged by 10-15 years, the maintenance cost is greatly reduced, and the social and economic cost brought by traffic control in the maintenance process is reduced.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. The concrete anti-collision pier repairing method comprises an anti-collision pier, a protective plate, sealing slurry and polymer mortar, and is characterized in that the concrete repairing process comprises the following steps:
s1, preprocessing the anti-collision pier;
s2, after the pretreatment is finished, uniformly paving the junction of the to-be-repaired surface of the anti-collision pier and the road surface by using quick-hardening type sealing slurry;
s3, adopting rapid hardening polymer mortar to be accumulated at a lower position in the middle of the sticking surface of the protection plate, wherein the thickness of the rapid hardening polymer mortar is larger than the designed width of a gap between the protection plate and the anti-collision pier;
s4, attaching the protection plate to the anti-collision pier in parallel, enabling the bottom of the protection plate to fall into the uniformly laid quick-hardening sealing slurry in a base slurry mode, and adjusting the gap between the protection plate and the anti-collision pier to be uniform so as to meet grouting conditions;
s5, sealing the edge of the gap between the protection plate and the anti-collision pier by using the quick-hardening type sealing slurry, and ensuring that the quick-hardening type sealing slurry is not exposed on the outer side;
s6, strongly bonding the protection plate and the anti-collision pier by using the quick-hardening polymer mortar;
s7, adopting the high-fluidity rapid-hardening grouting material to quickly grout the gap between the protection plate and the anti-collision pier, wherein the rapid grouting mode is a manual dumping mode or a mechanical pressure grouting mode, the grouting position needs to be fixed in the grouting process, and the high-fluidity rapid-hardening grouting material is grouted from one side to the other side;
s8, after the high-fluidity fast-hardening grouting material between the protection plates and the anti-collision piers is initially set, carrying out installation operation on the next protection plate;
s9, after grouting is completed, the anti-collision pier and the high-fluidity fast-hardening grouting material in the middle of the protection plate are condensed and hardened to generate a bridging effect, one side of the high-fluidity fast-hardening grouting material is tightly combined with the anti-collision pier, and the other side of the high-fluidity fast-hardening grouting material is combined with the inner rough surface of the protection plate;
and S10, after 1-2 hours from grouting, the protection plate can be completely fixed on the outer side of the anti-collision pier to form a whole.
2. The method for repairing concrete crash piers according to claim 1, wherein the thickness of the pavement in the step S2 is determined according to the fact that the bottom of the pavement is watertight after the protective plate is attached.
3. The method for repairing concrete crash piers according to claim 1, wherein in the step S3, when the protective plate is attached to the crash pier in parallel, the polymer mortar of the rapid hardening type is adhered to the bottom of the crash pier.
4. The method for repairing a concrete crash pier according to claim 1, wherein in the step S5, if only one side of each shield plate is exposed during installation, the exposed side is sealed with a flash type sealing paste, and the gap between the other side and the side of the previous shield plate is filled with a high strength flash type organic resin material.
5. The method for repairing concrete crash piers according to claim 1, wherein the time for forming the strength of the polymer mortar of the rapid hardening type in the step S3 is not later than the final setting time of the sealing paste of the rapid hardening type.
6. The method for repairing concrete crash piers according to claim 1, wherein in the step S8, before the next fender construction, the quick hardening type grout exposed to the outside at the bottom of the fender is firstly cleaned.
7. The method for repairing concrete crash piers according to claim 1, wherein the step of preprocessing in the step S1 is specifically:
s1.1, removing the concrete base layer with the damaged surface to expose a fresh concrete base layer;
s1.2, brushing a high-permeability steel bar rust inhibitor on the surface of the anti-collision pier without exposed steel bars, and performing subsequent operation after the steel bar rust inhibitor permeates the surface of the steel bars;
s1.3, for the concrete anti-collision pier with exposed steel bars, firstly, a damaged concrete base layer is removed, corrosion on the surfaces of the steel bars is removed in a physical polishing or chemical reagent cleaning mode, after the surfaces of the steel bars are dried, high-rust-resistance mortar is used for repairing the positions near the steel bars and the surfaces of the anti-collision piers, and after the repaired high-rust-resistance mortar is hardened, follow-up work is carried out.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114960475A (en) * | 2022-06-02 | 2022-08-30 | 交通运输部公路科学研究所 | Concrete guardrail collision-facing surface steel bar corrosion repairing and reinforcing method |
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| US9598827B1 (en) * | 2016-08-20 | 2017-03-21 | Victor Nicholas Pavloff, Jr. | Barrier rail retrofit device assembly |
| CN107653777A (en) * | 2015-11-03 | 2018-02-02 | 北京鸿锐嘉科技发展有限公司 | The preparation method of crash bearer |
| KR101978443B1 (en) * | 2018-11-29 | 2019-05-14 | 주식회사 씨알디 | High strength concrete pannel structure and road safety structure of reinforcent method using the same |
| CN109867533A (en) * | 2019-04-09 | 2019-06-11 | 吴金良 | A kind of renovation of concrete anti-collision wall and means of defence |
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2022
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102014212507A1 (en) * | 2014-06-27 | 2015-12-31 | Ed. Züblin Ag | Repaired Concrete Conductor Section |
| CN107653777A (en) * | 2015-11-03 | 2018-02-02 | 北京鸿锐嘉科技发展有限公司 | The preparation method of crash bearer |
| US9598827B1 (en) * | 2016-08-20 | 2017-03-21 | Victor Nicholas Pavloff, Jr. | Barrier rail retrofit device assembly |
| KR101978443B1 (en) * | 2018-11-29 | 2019-05-14 | 주식회사 씨알디 | High strength concrete pannel structure and road safety structure of reinforcent method using the same |
| CN109867533A (en) * | 2019-04-09 | 2019-06-11 | 吴金良 | A kind of renovation of concrete anti-collision wall and means of defence |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114960475A (en) * | 2022-06-02 | 2022-08-30 | 交通运输部公路科学研究所 | Concrete guardrail collision-facing surface steel bar corrosion repairing and reinforcing method |
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