CN110593090A - Method for repairing bridge expansion joint - Google Patents
Method for repairing bridge expansion joint Download PDFInfo
- Publication number
- CN110593090A CN110593090A CN201910956324.5A CN201910956324A CN110593090A CN 110593090 A CN110593090 A CN 110593090A CN 201910956324 A CN201910956324 A CN 201910956324A CN 110593090 A CN110593090 A CN 110593090A
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- Prior art keywords
- expansion joint
- bridge
- width
- mixture
- telescopic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
-
- 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
- E01D19/06—Arrangement, construction or bridging of expansion joints
- E01D19/067—Flat continuous joints cast in situ
Abstract
The invention provides a method for repairing a bridge expansion joint, and belongs to the technical field of highway bridge structures. The method comprises the steps of firstly determining the treatment depth and width of an anchoring area of the expansion joint through the width of the expansion joint of the bridge, dismantling the original profile steel expansion joint device, replacing the original expansion joint device with a mixture of aggregate and elastic epoxy resin, and enabling the construction to be convenient, wherein the repaired expansion joint structure is durable.
Description
Technical Field
The invention belongs to the technical field of highway bridge structures, and particularly relates to a method for repairing a bridge expansion joint.
Background
At present, the highway bridge expansion joint of china uses the steel expansion joint as the main, receives the influence of steel expansion joint self defect and driving and environmental load factor, and shaped steel expansion joint and anchor area disease appear often, if: the expansion joint is too narrow, the expansion joint difference in height, the rubber of expansion joint damages, the expansion joint blocks up, the anchor district is damaged, the expansion joint seeps water etc.. If steel expansion joint disease can not in time be handled, influence the comfortable and driving safety of driving a vehicle in, can cause the damage of beam slab and pier when serious, if: the main beam jacking, the bridge abutment back wall cracking, the support rubber aging cracking, the steel plate corrosion, the corrosion pitting of pier concrete and solid plate beams, the corrosion of the end of a steel structure beam body and the like. The main body damage of the bridge caused by the expansion joint disease continuously spreads, and finally threatens the service safety of the bridge, so that the bridge is damaged and people die, and the prevention and the treatment of the expansion joint disease are always highly valued by the highway bridge industry.
In the bridge expansion joint diseases, the damage treatment to the anchoring area accounts for a larger proportion in the conventional maintenance, and the traffic sealing time is longer under the influence of the curing characteristic of a repairing material, the construction process and the like; furthermore, more damaged parts of the anchoring area are limited to replacement of shallow and superficial layer materials, the treatment depth (namely the paving thickness of the repair material) is often determined by experience, so that the problems of repairing holes in a body and the like caused by interference of an expansion joint device after the repairing is not performed are often caused, the damage is easy to occur shortly after the vehicle is started, and the repairing of the damaged parts of the anchoring area is always a difficult problem in bridge maintenance.
Aiming at the aspects of improving the repair construction efficiency, improving the durability of the repaired expansion joint and the like, some repair methods or processes are disclosed domestically, such as: CN106906740A discloses a method for repairing a bridge expansion joint, which comprises: paying off and positioning a damaged and repaired area of the bridge expansion joint, and determining the area to be repaired; cutting the area to be repaired by using a cutting machine; chiseling out the surface concrete of the anchoring area of the expansion joint by using an air pick until the surface reinforcing steel bars of the reinforcing steel bar protection layer are exposed; arranging an anchoring increasing area outside the expansion joint anchoring area, and chiseling concrete in the anchoring increasing area by adopting an air pick until the concrete reaches a main beam structure base plane; then, installing steel bars in the anchoring enlarged area and planting the steel bars; pouring epoxy resin concrete into the expansion joint anchoring area and the anchoring increasing area; and (5) maintaining. CN106894332A discloses a repair structure for a transition area of a concrete bridge expansion joint of a highway and a construction method, wherein the method comprises the following steps of 1) chiseling original filling materials; 2) treating a joint surface; 3) positioning and installing a truss; 4) pouring the ultrahigh-toughness self-compacting concrete layer; 5) interface enhancement treatment; 6) pouring a high-performance overlay wearing layer; 7) and (5) naturally maintaining. CN104746439A discloses a method for rapidly repairing damaged bridge expansion joint notches, which comprises the following steps: s1, chiseling and trimming the concrete at the opening of the expansion joint, removing dust and drying moisture; s2, coating a primer on the opening of the expansion joint; s3, preparing polyurethane elastic concrete, introducing the polyurethane elastic concrete into the slot of the expansion joint while introducing aggregate until the slot of the expansion joint is filled; and S4, folding the polyurethane elastic concrete to make the surface flat. CN104404871A discloses a method for treating a bridge expansion joint, which comprises: inspecting the bridge expansion joints at intervals of a preset time period; positioning a damaged component in the telescoping structure; the supporting beam is hoisted and the damaged part is replaced. The method for treating the bridge expansion joint provided by the invention is used for periodically checking the bridge expansion joint and timely finding whether parts in a telescopic structure in the bridge expansion joint are damaged or not. CN104018424A discloses a bridge expansion joint repair method, and it includes in bridge expansion joint repair construction, at first clears away damaged rubber expansion joint, then adopts following technical measure: elastic concrete is filled in the concrete groove of the bridge deck section above the telescopic trench until the concrete groove is level with the bridge deck, and an elastic rubber plate is arranged between the telescopic trench and the elastic concrete.
The repairing method disclosed by the invention all relates to the steps of chiseling expansion joint anchoring concrete, and then pouring self-compacting cement concrete, epoxy resin concrete, polyurethane concrete or elastic concrete material. However, the device for removing the profile steel expansion joint is not involved, and the treatment depth and the treatment width of the repair construction of the anchoring area are not involved.
Disclosure of Invention
Aiming at one or more problems in the prior art, the invention provides a method for repairing a bridge expansion joint, which is suitable for the width of the bridge expansion joint not greater than 160mm and comprises the following steps:
s1: determining the treatment depth h and the width b of an anchoring area of the expansion joint according to the width d of the bridge expansion joint: for the expansion joint with the expansion joint width d less than or equal to 160mm, the treatment depth h and the width b of the anchoring area are as follows: when d is more than or equal to 80mm and less than or equal to 160mm, h is 150mm, and b is 600 mm; when d is more than or equal to 60mm and less than 80mm, h is 120mm, and b is 500 mm; when d is less than 60mm, h is 100mm, and b is 500 mm;
s2: chiseling the anchoring concrete of the expansion joint anchoring area according to the determined treatment depth h and width B of the expansion joint anchoring area, cutting off the original expansion joint device to be used as an expansion joint notch, keeping the embedded steel bars in the expansion joint notch until the embedded steel bars protrude out and are not more than 20mm after being cleaned, then coating epoxy resin with the thickness of 2-3mm on the bottom surface of the expansion joint notch to be used as an adhesive layer, and if the actual width B of the expansion joint anchoring area is more than B, taking the actual width of the expansion joint anchoring area as B;
s3: installing a support template in the telescopic slot, sticking a cloth-based adhesive tape along the width direction of the bridge at the edge of the slot opening of the telescopic slot processed in the step S2, wherein the top surface of the support template exceeds the surface of the bridge deck pavement by 4-6 mm, then pouring a mixture into the slot opening of the telescopic slot, and leveling to be flush with the upper surface of the support template;
s4: compacting the mixture paved in the telescopic seam notch, and controlling the compacted elevation to be consistent with the elevation of the bridge deck pavement layer to finish paving and compacting the mixture in the telescopic seam notch;
s5: coating epoxy resin with the thickness of 1-3mm on the surface of the mixture after tamping is finished, and then spreading machine-made sand with the granularity of 2-3mm, preferably 2.36 mm;
s6: and (3) removing the supporting template, then installing a sealing strip in the telescopic joint ditch, then sticking cloth-based adhesive tapes on the edges of the telescopic joints on the two sides in the telescopic joint ditch for protection, and then pouring sealant into the telescopic joint ditch to finish the repair of the bridge expansion joint.
In the step S3, the mixture is the mixture of the aggregate and the elastic epoxy resin according to the mass ratio of (6.5-7.0) to 1.
The aggregate is igneous rock stone with the maximum nominal grain diameter not more than 4.75mm, the weight percentage of the aggregate with the grain diameter below 1.18mm is not more than 10 percent, and carbon black with the fineness of 400 meshes and the weight percentage of 5 percent is doped; the elastic epoxy resin comprises a component A and a component B in a mass ratio of (1.5-2.0) to 1; the component A comprises 60-70 wt% of bisphenol A type resin base stock, 14-16 wt% of reactive diluent, 10-15 wt% of elasticizer and 2-4 wt% of toughener; the component B comprises 70-85 wt% of fatty amine curing agent, 2-5 wt% of accelerator, 10-12 wt% of flexibilizer and 3-5 wt% of anti-yellowing agent.
The 4.75mm square-hole sieve of the machine-made sand has a passing rate of more than 98 percent and a passing rate of 2-3mm square-hole sieves is not more than 5 percent, and the machine-made sand also comprises carbon black with fineness of 400 meshes and weight percent of 5 percent.
In the step S6, the sealing strip is a polysulfide sealing strip, and the sealant is a silicone sealant.
Based on the technical scheme, the invention provides a rapid repair method for damages of an expansion joint anchoring area of a replaceable steel bridge expansion joint device. The method comprises the steps of firstly determining the treatment depth and width of an anchoring area of the expansion joint through the width of the expansion joint, dismantling the original profile steel expansion joint device, replacing the original expansion joint device with a mixture of aggregate containing a photo-thermal ageing resistant component and elastic epoxy resin, and better overcoming the defects of brittleness, ageing and the like of the epoxy resin mixture, so that the requirements on durability and strength of the bridge expansion joint structure are met, and the bridge expansion joint structure is easy to replace in the later period.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural view of a typical steel expansion joint and an anchoring zone thereof;
FIG. 2 is a cross-sectional view of the expansion joint along the bridge, after the anchoring concrete is chiseled off and the original expansion joint device is cut off;
FIG. 3 is a cross-sectional view of the expansion joint along the bridge after the filling, spreading and rolling of the mixture of aggregate and elastic resin;
FIG. 4 is a cross-sectional view of an expansion joint along the bridge direction repaired by the method of the present invention;
fig. 5 is a schematic structural diagram of a supporting template in paving and tamping construction of the aggregate and the elastic epoxy resin mixture.
Detailed Description
In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.
The present invention will be described in detail with reference to specific embodiments.
As shown in fig. 1, a schematic structural diagram of a profile steel expansion joint device and an anchoring area thereof in the prior art is shown, wherein a typical profile steel expansion joint device is composed of an expansion joint device main body 2, an expansion joint device cover plate 3 and an expansion joint device rubber water stop 4, and is connected with a main girder and a beam plate 5 through a beam plate embedded steel bar 1 for fixing the expansion joint device, the expansion joint device is fixed by anchoring concrete 6 (mostly steel fiber cement concrete or high-strength cement concrete), and the elevation of the top surface of the anchoring concrete is consistent with that of an asphalt concrete bridge deck pavement layer 8. The following embodiments are directed to the typical expansion joint device and the anchoring area thereof shown in fig. 1.
S1, collecting design data of a bridge expansion joint to be repaired, and carrying out field measurement on a corresponding entity bridge expansion joint to determine the width of the bridge expansion joint, the width of an expansion joint anchoring area and the width of a corresponding single-beam slab; and then determining the treatment depth and width of the anchoring area of the expansion joint repair construction according to the data shown in the following table 1.
TABLE 1 parameters for repairing damaged bridge expansion joint anchoring zone
S2, as shown in figure 2, according to the determined anchoring area treatment width b and depth h, adopting an electric pick to chisel the anchoring concrete, removing the asphalt concrete bridge deck pavement layer 8 and the cement concrete bridge deck pavement layer 7 within the range of the treatment width b, cutting off the expansion joint device to form an expansion joint notch 11, and cutting off the embedded steel bars 1 for fixing the expansion joint device to ensure that the broken ends 12 of the embedded steel bars are not more than 20mm higher than the cleaned base plane; and (3) cleaning the notch, wherein the base surface of the notch is required not to have loose concrete fragments, particles and floating dust, preparing two-component elastic epoxy resin (described in detail below) during the construction, and brushing adhesive layer epoxy resin 13 with the thickness of about 2mm on the base surface after cleaning the base surface.
S3, as shown in the figure 3, preparing a U-shaped supporting template 15 (shown in the figure 5) according to the width d of the expansion joint, wherein the material is preferably stainless steel, plastic steel, alloy aluminum and the like with good surface roughness and difficult deformation, the supporting template 15 is arranged in the expansion joint ditch, the top plane of the supporting template 15 exceeds the bridge deck pavement surface (namely the upper surface of the asphalt concrete bridge deck pavement layer 8) by about 5mm, the lower port of the supporting template 15 needs to go deep into the expansion joint ditch to the thickness position of the main beam plate 5, the lap depth in the thickness direction of the adjacent main beam plate 5 exceeds 100mm, meanwhile, a cloth base adhesive tape 16 is stuck to the edge of the notch of the expansion joint along the width direction of the bridge, and the width of the cloth base adhesive tape is; mounting a supporting template 15, pasting a cloth-based adhesive tape 16, preparing a mixture of aggregate and elastic epoxy resin, filling the prepared mixture 19 into the slot opening 11 of the expansion joint treated in the step S2, and leveling the mixture by using a leveling plate while filling the mixture until the surface 17 of the mixture is flush with the top surface of the supporting template 15; when the paving length of the mixture exceeds 1/3 of the width of a single bridge span, a small-sized plate compactor is adopted to tamp the paved mixture, and the elevation of the surface 18 of the tamped repaired mixture is controlled to be consistent with the elevation of a bridge deck pavement layer (namely the upper surface of the asphalt concrete bridge deck pavement layer 8), so that the paving and tamping of the mixture are completed. The selected flat plate tamper is a universal flat plate tamper, the working area is required to be 500 multiplied by 690mm, the excitation force is not more than 30kN, and the two-gear regulation of dynamic compaction and non-dynamic compaction is realized.
The elastic epoxy resin in the mixture used in the step comprises a component A and a component B, wherein the component A contains 60-70 wt% of bisphenol A type resin base stock, 14-16 wt% of reactive diluent, 10-15 wt% of elasticizer and 2-4 wt% of toughener; the component B comprises 70-85 wt% of fatty amine curing agent, 2-5 wt% of accelerator, 10-12 wt% of flexibilizer and 3-5 wt% of anti-yellowing agent. Wherein the bisphenol A type resin base material is bisphenol A type epoxy resin; the reactive diluent is low molecular weight epoxy compound containing epoxy group, which can participate in the curing reaction of epoxy resin to become a part of the cross-linked network structure of the cured epoxy resin, and can be HK-66, HELOXY11, HELOXY48, HELOXY62, HELOXY505, etc.; the elasticizer can be nitrile rubber; the toughening agent can be polysulfide rubber, liquid silicone rubber, polyether, polysulfone, polyimide, nano calcium carbonate, nano titanium dioxide and the like; the aliphatic amine curing agent may be TAB-800; the accelerant is a substance with a small dosage which can improve the reaction rate when used together with a catalyst or a fixing agent, and can be DMP-30, EP-184, triethanolamine and the like; the anti-yellowing agent may be 2, 2, 6, 6-tetramethylpiperidine nitroxide radical or the like. Before construction of the expansion joint, the expansion joint is prepared in advance according to a formula and is detected, and the technical performance of the expansion joint needs to meet the requirements shown in the table 2.
Table 2: technical requirements of the elastic epoxy resin used in the present invention
The aggregate in the mixture used in the step is igneous rock stone with the maximum nominal grain diameter not more than 4.75mm, the weight percentage of the aggregate with the grain diameter below 1.18mm is not more than 10%, and carbon black with the fineness of 400 meshes and the weight percentage of 5% is doped; before the mixture is stirred, the components in the aggregate are uniformly mixed. The mixing of the mixture is generally carried out by adopting a small planetary cement concrete mixer, when the ambient temperature is lower than 15 ℃, a heating belt is wrapped on the outer wall of a mixing pot to preheat the mixture, so that the mixture can be mixed when the temperature in the mixing pot exceeds 25 ℃; when the mixture is mixed, firstly adding the aggregate, mixing for 5min, then adding the prepared elastic epoxy resin, mixing for 8min, and discharging; the distance between the swing position of the mixer and the expansion joint area is not more than 10 m. The mechanical properties and technical requirements of the mixed materials of the elastic epoxy resin and the aggregate with different mixing ratios are shown in the following table 3.
Table 3: the mechanical property and the technical requirement of the mixed material stirred by the invention
From the results in table 3 above, it can be seen that when the elastic epoxy resin and the aggregate are mixed according to different proportions, for example, when the weight proportion of the elastic epoxy resin to the aggregate is 6.0: 1, that is, the content of the aggregate is relatively high, the mechanical properties of the mixed mixture obtained by mixing cannot meet the technical requirements, and when the weight proportion of the elastic epoxy resin to the aggregate is 7.5: 1, that is, the content of the elastic epoxy resin is relatively high, the mechanical properties of the mixed mixture obtained by mixing cannot meet the technical requirements, therefore, in the present invention, the weight proportion of the elastic epoxy resin to the aggregate is selected to be within the range of 6.5: 1-7.0: 1, and the mechanical properties of the mixed mixture can meet the technical requirements.
S4, as shown in figure 4, after the mixture at the opening of the expansion joint is paved and tamped for about 30-40 min, the supporting template 15 is dismantled, and then an elastic tough sealing rubber strip 20 (polysulfide sealing rubber strip) is arranged in the expansion joint groove, wherein the depth of the upper edge of the sealing rubber strip from the surface of the bridge deck is required to be h/2; after the adhesive tape 20 is arranged, plastic cloth is covered on the surface of the repairing body on the two sides of the expansion joint or a preservative film is attached to the surface of the repairing body, and then the high-efficiency sealant 21 (silicone sealant) is filled into the expansion joint groove; after the operation is finished, coating elastic epoxy resin with the thickness of about 2mm on the surface of the repairing body, then spraying prepared special machine-made sand (the granularity is 2.36mm) on the surface coated with the epoxy resin, tamping the sand by using a flat plate tamper, and not opening dynamic compaction in real time until the coated epoxy resin is reversed from a machine-made sand gap to form a protective layer 22 on the surface of the repairing body; and finally, polishing the edges of the repairing bodies on the two sides of the telescopic seam channel by using a grinding disc by using a handheld angle grinder until the side length of a right angle is a 45-degree chamfer 23 of which the length is 5 mm.
In summary, the method for repairing a bridge expansion joint provided by the invention can replace a steel bridge expansion joint device. The method comprises the steps of firstly determining the treatment depth and width of an anchoring area of the expansion joint through the width of the expansion joint, dismantling the original profile steel expansion joint device, replacing the original expansion joint device with a mixture of aggregate containing a photo-thermal ageing resistant component and elastic epoxy resin, and better overcoming the defects of brittleness, ageing and the like of the epoxy resin mixture, so that the requirements on durability and strength of the bridge expansion joint structure are met, the expansion joint structure is easy to replace in the later period, and the expansion joint structure can be popularized and used in a large range.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A method for repairing a bridge expansion joint, which is applicable to a bridge expansion joint with a width not greater than 160mm, comprises the following steps:
s1: determining the treatment depth h and the width b of an anchoring area of the expansion joint according to the width d of the bridge expansion joint: for the expansion joint with the expansion joint width d less than or equal to 160mm, the treatment depth h and the width b of the anchoring area are as follows: when d is more than or equal to 80mm and less than or equal to 160mm, h is 150mm, and b is 600 mm; when d is more than or equal to 60mm and less than 80mm, h is 120mm, and b is 500 mm; when d is less than 60mm, h is 100mm, and b is 500 mm;
s2: chiseling the anchoring concrete of the expansion joint anchoring area according to the determined treatment depth h and width B of the expansion joint anchoring area, cutting off the original expansion joint device to be used as an expansion joint notch, keeping the embedded steel bars in the expansion joint notch until the embedded steel bars protrude out and are not more than 20mm after being cleaned, then coating epoxy resin with the thickness of 2-3mm on the bottom surface of the expansion joint notch to be used as an adhesive layer, and if the actual width B of the expansion joint anchoring area is more than B, taking the actual width of the expansion joint anchoring area as B;
s3: installing a support template in the telescopic slot, sticking a cloth-based adhesive tape along the width direction of the bridge at the edge of the slot opening of the telescopic slot processed in the step S2, wherein the top surface of the support template exceeds the surface of the bridge deck pavement by 4-6 mm, then pouring a mixture into the slot opening of the telescopic slot, and leveling to be flush with the upper surface of the support template;
s4: compacting the mixture paved in the telescopic seam notch, and controlling the compacted elevation to be consistent with the elevation of the bridge deck pavement layer to finish paving and compacting the mixture in the telescopic seam notch;
s5: coating epoxy resin with the thickness of 1-3mm on the surface of the mixture after tamping, and then spraying machine-made sand with the granularity of 2-3 mm; and
s6: and (3) removing the supporting template, then installing a sealing strip in the telescopic joint ditch, then sticking cloth-based adhesive tapes on the edges of the telescopic joints on the two sides in the telescopic joint ditch for protection, and then pouring sealant into the telescopic joint ditch to finish the repair of the bridge expansion joint.
2. The method according to claim 1, wherein the mixture in the step S3 is prepared by mixing the aggregate and the elastic epoxy resin according to a mass ratio of (6.5-7.0): 1, in a mixture.
3. The method as claimed in claim 2, wherein the aggregate is igneous rock-like stone having a maximum nominal particle size of not more than 4.75mm, the weight percentage of the aggregate having a particle size of not more than 1.18mm is not more than 10%, and carbon black having a fineness of 400 mesh and a weight percentage of 5% is incorporated;
the elastic epoxy resin is prepared from the following components in percentage by mass (1.5-2.0): 1, a component A and a component B; the component A comprises 60-70 wt% of bisphenol A type resin base stock, 14-16 wt% of reactive diluent, 10-15 wt% of elasticizer and 2-4 wt% of toughener; the component B comprises 70-85 wt% of fatty amine curing agent, 2-5 wt% of accelerator, 10-12 wt% of flexibilizer and 3-5 wt% of anti-yellowing agent.
4. The method as claimed in claim 1, wherein in step S5, the machine-made sand has a 4.75mm square mesh sieve passage rate of more than 98%, a 2-3mm square mesh sieve passage rate of not more than 5%, and further comprises carbon black having a fineness of 400 mesh and a weight percentage of 5%.
5. The method of claim 1 wherein in step S6 said sealing strip is a polysulfide sealant strip and said sealant is a silicone sealant.
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| CN201910956324.5A CN110593090A (en) | 2019-10-09 | 2019-10-09 | Method for repairing bridge expansion joint |
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| CN201910956324.5A CN110593090A (en) | 2019-10-09 | 2019-10-09 | Method for repairing bridge expansion joint |
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| CN110593090A true CN110593090A (en) | 2019-12-20 |
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| CN110904866A (en) * | 2019-12-25 | 2020-03-24 | 德州市公路工程总公司 | Concrete bridge deck pavement replacement and repair structure and construction method |
| CN116675494A (en) * | 2023-06-02 | 2023-09-01 | 山东大学 | Preparation and repair method of repair material with high interface bonding performance and low bone slurry ratio |
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Cited By (4)
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| CN110904866A (en) * | 2019-12-25 | 2020-03-24 | 德州市公路工程总公司 | Concrete bridge deck pavement replacement and repair structure and construction method |
| CN110904866B (en) * | 2019-12-25 | 2021-04-06 | 德州市公路工程总公司 | Concrete bridge deck pavement replacement and repair structure and construction method |
| CN116675494A (en) * | 2023-06-02 | 2023-09-01 | 山东大学 | Preparation and repair method of repair material with high interface bonding performance and low bone slurry ratio |
| CN116675494B (en) * | 2023-06-02 | 2024-03-29 | 山东大学 | Preparation and repair method of repair material with high interface bonding performance and low bone slurry ratio |
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Application publication date: 20191220 |
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