CN114277680A - Composite resin concrete steel bridge deck pavement structure and construction method thereof - Google Patents
Composite resin concrete steel bridge deck pavement structure and construction method thereof Download PDFInfo
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- CN114277680A CN114277680A CN202210132341.9A CN202210132341A CN114277680A CN 114277680 A CN114277680 A CN 114277680A CN 202210132341 A CN202210132341 A CN 202210132341A CN 114277680 A CN114277680 A CN 114277680A
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Images
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
- E01D19/083—Waterproofing of bridge decks; Other insulations for bridges, e.g. thermal ; Bridge deck surfacings
-
- 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
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
- E01D19/125—Grating or flooring for bridges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
- Road Paving Structures (AREA)
Abstract
The invention provides a composite resin concrete steel bridge deck pavement structure and a construction method thereof; the steel bridge deck pavement structure comprises a steel bridge deck, a resin waterproof bonding layer and a resin concrete layer; wherein, a reinforced layer is laid in the resin concrete layer. The reinforcing layer is a steel bar mesh and/or a fiber material and/or broken stone particles. According to the technical scheme provided by the invention, the reinforcing layer is additionally arranged in the resin concrete, so that the integral strength of the resin concrete is improved; meanwhile, the resin waterproof bonding layer is used for connecting the steel bridge deck and the resin concrete layer, so that the bonding strength of the steel bridge deck and the resin concrete layer is higher, and the shearing resistance of the steel bridge deck and the resin concrete layer is obviously improved.
Description
Technical Field
The invention relates to the field of steel bridge deck pavement, in particular to a composite resin concrete steel bridge deck pavement structure and a construction method thereof.
Background
With the development of orthotropic steel bridge deck technology and the continuous expansion of application in modern bridges, the steel bridge deck pavement technology becomes an indispensable part in bridge design. The steel bridge deck pavement is an important factor influencing the durability and the driving comfort of the bridge.
At present, the mainstream steel bridge deck paving materials at home and abroad mainly comprise hot-mix asphalt concrete or modified dense-graded asphalt concrete, high-temperature mixing and pouring type asphalt concrete, modified asphalt SMA and epoxy asphalt concrete. Although the price of the hot-mix asphalt concrete or the modified dense-graded asphalt concrete is low, the pavement performance of the hot-mix asphalt concrete or the modified dense-graded asphalt concrete on a steel bridge deck is seriously insufficient. The cast asphalt concrete has excellent waterproof and ageing resistance, no need of waterproof layer, high crack resistance, good steel plate following performance and high steel plate adhering performance, but poor high temperature stability and easy rutting. The modified asphalt SMA has good flexibility, certain loose resistance and crack resistance, certain plastic flow resistance and permanent deformation resistance, is not easy to generate ruts, and has a rough surface structure, but the main defect of the modified asphalt SMA is that the bonding strength of a pavement layer and a steel bridge deck is insufficient. The epoxy asphalt concrete has higher strength, relatively stronger plastic flow resistance and permanent deformation resistance at high temperature, better low-temperature crack resistance, certain fatigue resistance and chemical substance corrosion resistance; but the main disadvantages of the epoxy asphalt concrete are that the preparation process of the epoxy asphalt concrete is complex, the requirements on time and temperature in construction are very strict, the construction difficulty is high, and the material cost is high.
Through the analysis of disease types and causes of steel bridge deck pavement at home and abroad, the current steel bridge deck composite pavement structure is found to be easy to crack and other diseases on the pavement surface layer. The type of cracking that occurs is mainly due to the various deformations of the steel deck slab under load, particularly in the negative moment region. On one hand, the rigidity of the bridge deck structure is insufficient, excessive deflection and the like are generated, and on the other hand, the compliance performance of the pavement layer structure is insufficient; the delaminating disease is mainly generated because the shearing strength between the pavement structure and the steel plate is insufficient, the integral neutralization axial plane of the composite structure formed by the pavement structure and the steel plate is the maximum position of the horizontal shearing force, the neutralization axial plane is close to the connecting interface of the pavement structure and the steel bridge deck plate, and the shearing resistance of the interface is greatly challenged, so that the shearing strength can be improved by setting the shearing nails under the condition that the shearing strength cannot meet the requirement, but the welding shearing nails increase the construction process, the construction period is prolonged, and the requirement on the construction condition is higher. Therefore, a steel bridge deck pavement technology which can adapt to the traffic overload condition in China and has lower requirements on construction conditions and construction environments is urgently needed.
Disclosure of Invention
The invention aims to solve the problems that the steel structure is easy to generate fatigue cracking and the like due to insufficient rigidity of the steel bridge deck or excessive deformation under the action of heavy load and overload, and the steel bridge deck is easy to delaminate under the influence of shear stress and temperature change. For the cracking problem, the common solution is to increase the elastic modulus of the steel plate surface pavement material or increase the thickness of the pavement layer, thereby reducing the deflection of the steel deck plate, but the stress of the pavement surface is increased, resulting in the occurrence of diseases such as cracks on the pavement surface. The delamination problem is usually solved by welding shear nails, but the added process seriously affects the construction period and increases the requirements on construction conditions.
In order to solve the above problems, in one aspect, the present invention provides a composite resin concrete steel bridge deck pavement structure, which sequentially comprises, from bottom to top: steel bridge deck, resin waterproof bonding layer, resin concrete layer; wherein, lay the enhancement layer in the resin concrete layer, the enhancement layer includes reinforcing bar net piece and/or fibrous material and/or rubble grain.
The resin waterproof bonding layer can effectively connect the steel bridge deck and the resin concrete layer, does not need to be welded with shear nails, and can prevent the pavement structure on the upper layer and the steel bridge deck from generating relative movement. The resin concrete layer is obtained by modifying resin, has high bonding strength and zero porosity, and has a waterproof function; the resin waterproof bonding layer and the resin concrete layer are matched to form an effective waterproof barrier, so that the steel bridge deck is prevented from being corroded by water, and the service life of the pavement structure is prolonged. On the other hand, the strength of the whole resin concrete is improved by adding the reinforcing layer in the resin concrete; further, the shearing resistance is obviously improved.
In addition, the reinforcing layer is a steel bar mesh and/or a fiber material and/or broken stone particles. The reinforcing mesh and/or the fiber material and/or the broken stone particles can further effectively improve the strength of the steel bridge deck pavement structure, improve the overall rigidity of the steel bridge deck pavement structure, and reduce the stress amplitude of the steel bridge deck and the stress strain of the pavement surface layer.
Finally, the provision of the reinforcing layer may lift the resin concrete from a single particle reinforced composite to an oriented reinforced composite. The arrangement of the reinforcing layers is adjusted according to the thickness of the resin concrete and the content of the binder, a plurality of layers of reinforcing layers can be arranged, and the most suitable configuration condition of the resin concrete is selected according to the indexes of the bending tensile strength, the compression strength and the like of the reinforcing layers. The addition of the reinforcing layer obviously improves the overall tensile property of the pavement structure.
Further, the resin waterproof bonding layer comprises at least one of the following or a combination thereof: a polyurethane modified waterproof bonding layer, an epoxy resin modified waterproof bonding layer and a methyl methacrylate modified waterproof bonding layer.
Further, the resin waterproof bonding layer comprises at least one of the following or a combination thereof: polyurethane, epoxy resin, furan resin, epoxy resin, polyester, vinyl resin, acrylic.
Further, the resin concrete layer includes at least one of the following or a combination thereof: a silane coupling agent modified resin concrete layer, a titanate coupling agent modified resin concrete layer and an aluminate coupling agent modified resin concrete layer.
Further, the resin concrete layer includes at least one of the following or a combination thereof: polyurethane, epoxy resin, furan resin, epoxy resin, polyester, vinyl resin, acrylic.
Furthermore, the resin waterproof bonding layer is modified by polyurethane, so that the steel bridge deck can be effectively prevented from rusting, the pavement layer is tightly bonded with the steel bridge deck, and the welding of shear nails is not needed.
The resin concrete layer is preferably polyurethane modified resin concrete, so that the bonding strength of the layer structure is increased, the porosity of the layer structure is reduced, and the waterproof performance of the layer structure is improved; in one embodiment, the use of silane coupling agents can enhance chemical bonding within the resin concrete, allowing effective organic and inorganic bonding with significant improvements in strain resistance, low temperature stability, and water resistance.
Further, the preparation steps of the resin concrete layer specifically comprise:
a: dehydrating polyether polyol for 1 to 1.5 hours under the conditions of vacuum and temperature of 130 to 140 ℃;
b: stirring the polyether polyol obtained in the step A at the temperature of 60-65 ℃ and gradually adding a metal catalyst, wherein the adding amount of the metal catalyst is 0.1-0.2% of the polyether polyol;
c: adding isophorone diisocyanate and strontium oxide into the polyether polyol obtained in the step B, and reacting for 1 to 1.5 hours at a temperature of 74 to 76 ℃ until the isocyanate content is 8 to 9 percent;
d: c, cooling the product obtained in the step C to room temperature to obtain a prepolymer;
e: mixing the prepolymer obtained in the step D with a cross-linking agent and an anti-ultraviolet agent to obtain a modified resin binder;
f: and adding a curing agent into the modified resin binder, and stirring to obtain the resin concrete layer.
In the above steps, the mass parts of the raw materials are as follows.
Polyol: isophorone diisocyanate: metal catalyst: strontium oxide: a crosslinking agent: anti-ultraviolet agent = 50: 50: 5: 2: 3: 4.
the crosslinking agent comprises methyldiethanolamine. The metal catalyst comprises zinc isobutyrate. The ultraviolet screening agent includes titanium dioxide.
Wherein the addition amount of the curing agent is 1.5 to 2.0 percent of the addition amount of the modified resin binder.
The anti-ultraviolet agent is prepared by the following steps:
a. according to the monomer: initiator: butyl acetate solvent = 40: 5: 55, heating a butyl acetate solvent to 95 ℃, dropwise adding a monomer and an initiator, preserving heat for 1 hour after dropwise adding, distilling, adding three times of water, dropwise adding an ammonium bicarbonate solution, and stirring until the ammonium bicarbonate solution is dissolved to obtain a matrix;
b. according to the weight percentage of titanium dioxide: matrix: water = 10: 20: 70, mixing materials according to a mass ratio to obtain slurry;
c. and (3) dropwise adding cation exchange resin into the slurry, stirring, adjusting the pH value to 4-5, filtering, washing and drying to obtain the uvioresistant agent.
According to the embodiment of the invention, isophorone diisocyanate is adopted to replace aromatic isocyanate, so that the modified resin binder has excellent anti-illumination and anti-aging properties. The titanium dioxide can effectively resist ultraviolet rays, and further improves the ultraviolet resistance and the aging resistance of the modified resin binder. In order to improve the surface energy of the anti-ultraviolet agent (i.e. titanium dioxide) and improve the dispersion stability of the anti-ultraviolet agent in an organic system, the surface of the titanium dioxide anti-ultraviolet agent is coated with an organic treating agent in the embodiment. Specifically, a mixture is first prepared by using a monomer, an initiator and a butyl acetate solvent, the mixture is completely dissolved in water in an alkaline environment to obtain a matrix, then titanium dioxide slurry containing the matrix is prepared, finally, a cation exchange resin is used for replacing the nano-ions of the slurry, as the nano-ions in the slurry are replaced, the pH of the slurry is reduced, and an organic mixture with low surface energy is gradually separated out on the surface of the titanium dioxide to form an organic coating film layer. Thereby avoiding the agglomeration of the titanium dioxide uvioresistant agent and further improving the uvioresistant and aging-resistant performance of the modified resin binder.
Further, the fiber material is at least one of the following or a combination thereof: glass fibers, carbon fibers, boron fibers, asbestos fibers, steel fibers.
Further, the strength structure is prepared by the steps of: according to the weight percentage of glass fiber: asbestos fibers: carboxylic acid: silane coupling agent: polyacrylic acid resin: diisodecyl phthalate = (32-38): (20-30): (4-6): (4-6): (5-10): (5-10) feeding the glass fiber, the asbestos fiber, the carboxylic acid, the silane coupling agent, the polyacrylic resin and the diisodecyl phthalate into a mixing roll, mixing for 1 hour at the temperature of 170-180 ℃, and discharging to obtain the modified strength structure.
In the above embodiment, the carboxylic acid activates the surfaces of the glass fibers and the asbestos fibers, and the interfacial bonding force between the glass fibers and the asbestos fibers and the resin is increased by the silane coupling agent. In particular, the molecular chain of the glass fiber is twisted with the polyacrylic resin and the diisodecyl phthalate to form a cross-linked twisted structure, so that the bonding force between the fiber and the resin is further enhanced, and the uniform stability and the dispersion performance of the product are improved.
Further, the mesh sheet includes reinforcing bars arranged at a certain interval in the longitudinal and transverse directions, respectively, and forming an angle with each other.
Furthermore, the reinforcing mesh is obtained by vertically and equidistantly distributing reinforcing steel bars in the longitudinal direction and the transverse direction.
Further, the diameter of the reinforcing bar is 1mm to 15 mm.
Further, the distribution pitch of the reinforcing steel bars is 20 mm to 300 mm.
Further, the particle size of the crushed stone particles is 1mm to 10 mm.
Furthermore, the resin concrete layer is reinforced by reinforcing fibers, the length of the reinforcing fibers is 3 mm to 18 mm, and the adding mass of the reinforcing fibers is 0.5 percent to 3.5 percent of the mass of the resin concrete layer.
Further, the reinforcing fibers include basalt fibers, glass fibers, and steel fibers.
It should be noted that the tensile strength of the pavement structure can be further improved by the close combination of the reinforced fiber and the resin concrete; on the other hand, the effect of strain strengthening of the pavement structure can be achieved by adjusting the mixing amount of the reinforcing fibers.
Preferably, the resin concrete provided by the invention comprises a binder, coarse aggregates and fine aggregates; when the steel fiber is added, the steel fiber is firstly mixed with coarse aggregate and fine aggregate; and adding the binder after the mixture is uniformly mixed for the second mixing to ensure that the steel fibers do not generate agglomeration.
Further, the steel bridge deck pavement structure still includes the fiber material layer, sets up in the top on resin concrete layer, and thickness is 0.1 millimeter to 4 millimeters.
The anti-cracking performance and the waterproof performance of the pavement structure are improved by arranging the fiber material layer, the overall waterproof effect of the pavement structure is further improved, and the protection capability of the steel bridge deck is obviously improved. The fiber material layer is laid by fiber net or fiber cloth, preferably glass fiber cloth.
Further, the fiber material is laid by the following method: before the paved resin concrete layer is cured, paving the fiber material on the surface of the resin concrete layer to enable the fiber material to be completely soaked; when the fiber material cannot be completely soaked, the surface of the fiber material is covered with the binder by adopting a manual coating method.
Furthermore, the steel bridge deck pavement structure also comprises a broken stone wearing layer which is formed by paving resin broken stones with surface discontinuous grading and is arranged above the resin concrete layer.
The crushed stone wearing layer enables the upper layer of the pavement structure to have the advantage of high toughness and can adapt to the deformation of the steel bridge deck.
On the other hand, the invention also provides a construction method of the composite resin concrete steel bridge deck pavement structure, which comprises the following steps:
s10: performing shot blasting rust removal treatment on the steel bridge deck plate to enable the surface roughness of the steel bridge deck plate to reach 50-100 microns;
s20: coating a resin waterproof adhesive on the surface of the steel bridge deck plate to form the resin waterproof adhesive layer, wherein the dosage of the resin waterproof adhesive is 0.1-1.0 kg/m;
s30: and spreading resin concrete on the resin waterproof bonding layer to form the resin concrete layer.
Further, between S10 and S20, S40: and arranging a reinforcing layer above the steel bridge deck.
Further, S30 specifically includes: resin concrete is paved on the resin waterproof bonding layer, and a reinforcing layer is paved on the resin concrete to form a resin concrete layer.
Further, S30 specifically includes: spreading resin concrete on the resin waterproof bonding layer, and spreading a reinforcing layer on the resin concrete, wherein the steps are performed at least once alternately to form the resin concrete layer.
Further, in S30, the resin concrete includes an aggregate and a binder.
Preferably, in step S10, the steel deck is shot-blasted and derusted by using a fully automatic dust-free shot blasting device, and the steel deck surface is kept clean, dry, pollution-free, flash-free, spatter-free, pinhole-free, flash-free, burr-free, etc. before shot blasting. And processing the part of the steel bridge deck plate which cannot be processed by the shot blasting equipment in a manual polishing mode. After shot blasting and rust removal, the roughness of the steel bridge deck plate should reach 50-100 microns, and the cleanliness should reach Sa2.5 grade.
Preferably, in step S20, the steps of laying the reinforcing layer and coating the resin-based waterproof adhesive are not divided into two steps. The reinforcing layer is a steel bar mesh and/or a fiber material and/or broken stone particles. In the mesh of reinforcing bars, the intersection points of the transverse and longitudinal reinforcing bars may be tied and fixed, but not limited to the above manner. More preferably, the transverse reinforcing bars should be placed over the longitudinal reinforcing bars. On the other hand, the reinforcing layer can be laid in multiple layers to meet different steel bridge deck requirements. When the resin waterproof adhesive is coated, the resin waterproof adhesive can be uniformly sprayed on the steel bridge deck by using a special spraying machine or by adopting a manual spraying mode; the steps are completed within 2 to 4 hours after the steel bridge deck is subjected to shot blasting. In order to prevent the resin waterproof binder from layering and precipitating during the transportation and storage processes to influence the construction quality; the mixture should be stirred well before coating. The binder is preferably stirred by an electric stirrer, preferably at a rate of 80 to 120r/min, and preferably for 30 to 40 seconds.
Preferably, in step S30, the resin concrete is prepared by mixing the raw materials with a special mixer, and sampling the discharged material at any time during mixing until the discharged material is uniform, stable and free from segregation. When the resin concrete is paved, a special paver for the resin concrete with leveling, distributing, vibrating and leveling functions is adopted for paving, and the paver moves forwards at a constant speed and continuously works. And adjusting the vibration frequency of the vibrating plate according to the binder precipitation condition of the surface of the resin concrete in the paving process, so that the binder is precipitated on the surface of the resin concrete after paving.
Further, polyurethane is added to the adhesive.
Further, S50 follows S30: and paving a broken stone wearing layer on the resin concrete layer.
Furthermore, the gravel wearing layer is formed by paving and paving gravel and adhesive after premixing the gravel and the adhesive.
Preferably, the method is adopted, the broken stone and the binder are mixed by using a special mixer for resin concrete, the mixing time is not shorter than 5 seconds, the discharged material is sampled and checked at any time during the mixing process, and the discharged material is uniform, stable and free from segregation. The paving operation is carried out by adopting the special resin concrete paver with leveling, distributing, vibrating and trowelling functions, and the machine moves forward at a constant speed and works continuously.
Furthermore, the gravel wearing layer is formed by coating an adhesive on the resin concrete layer, and spreading and paving gravel on the gravel wearing layer.
Preferably, in the above method, the adhesive is sprayed on the surface of the resin concrete layer, and thereafter, the surface is spread with crushed stones using a crushed stone spreader dedicated to resin concrete.
Further, the macadam has 50% to 70% by volume embedded in the binder.
The technical effect achieved after the technical scheme is adopted is as follows: the macadam has high toughness, hardness and wear resistance, and a binder is partially embedded in the macadam during construction; the broken stone effectively increases the surface friction coefficient of the pavement structure, is tightly combined with the binder and is not easy to fall off; therefore, the gravel wearing layer can eliminate road noise, improve the road skid resistance, easily discharge road surface accumulated water and obviously improve the driving comfort.
In conclusion, according to the technical scheme provided by the invention, the reinforcing layer and the steel fibers are added in the resin concrete layer of the steel bridge deck pavement structure, so that the strength of the bottom layer structure is improved, the overall rigidity of a steel bridge deck system is improved, and the stress amplitude of a steel bridge deck and the stress strain of a pavement surface layer are reduced. The upper strata of the structure of mating formation adds has polyurethane, is showing the flexibility that has promoted upper structure, suitably reduces the elastic modulus of mixture for upper structure has certain ability that adapts to the bridge floor and warp. The upper layer of the pavement structure has certain deformation capacity and the lower layer of the pavement structure has certain strength through rigid-flexible combination; the comprehensive performance of the steel bridge deck pavement structure is improved.
On the other hand, the resin waterproof bonding layer is modified by polyurethane, so that the bonding strength with the steel bridge deck is extremely high, the shearing resistance is obviously improved, and the welding of shear nails is not needed. The combination of the multilayer structure and the hierarchical structure of the steel bridge deck adopts the adhesive with excellent performance, has a waterproof function, and effectively solves the problems that the existing paving material cannot participate in stress, has long construction period, harsh maintenance conditions, poor road performance and the like.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic view of a pavement structure of a steel bridge deck provided by the invention.
Fig. 2 is a schematic diagram of the arrangement of the reinforcing mesh.
Fig. 3 is a flow chart of the construction method of the steel bridge deck pavement structure provided by the invention.
FIG. 4 is a schematic view of a steel deck pavement structure with a rubble reinforced layer according to the present invention.
Description of the main element symbols:
1-steel deck slab; 2-a reinforcing layer; 3-a resin-based adhesive layer; 4-a resin concrete layer; 5-a layer of fibrous material; 6-gravel wearing course.
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 of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
[ first embodiment ] A method for manufacturing a semiconductor device
Referring to fig. 1, the steel bridge deck pavement structure provided by this embodiment sequentially includes from top to bottom: the bridge comprises a steel bridge deck 1, a resin waterproof bonding layer 3, a resin concrete layer 4, a fiber material layer 5 and a broken stone wearing layer 6; wherein, a reinforced layer 2 is laid in the resin concrete layer 4.
The reinforcing layer 2 is a steel bar mesh and/or a fiber material; the fiber material can be fiber cloth or fiber net, preferably glass fiber cloth; the mesh of reinforcing bars and the fibrous material may be used in combination.
Referring to fig. 2, the reinforcing mesh is obtained by vertically and equidistantly distributing longitudinal and transverse reinforcing bars, and the junction points are usually fixed by bundling; the distribution mode of the steel mesh sheets can be different according to different pavement requirements, the thickness of the resin concrete layer 4 and other different practical conditions. The diameter of the reinforcing bars is preferably 1mm to 15 mm, and the distribution pitch between the reinforcing bars is preferably 20 mm to 300 mm.
In one embodiment, the steel bridge deck 1 is shot blasting derusting steel bridge deck, the cleanliness of the steel bridge deck needs to reach Sa2.5 grade, and the roughness of the steel bridge deck is between 50 and 100 micrometers. The cleanliness and the roughness influence the adhesion tightness between the steel bridge deck plate 1 and other layered structures, and further influence the overall service life of the steel bridge deck pavement structure; the set indexes balance the difficulty of the shot blasting rust removal process and the relation between the difficulty and the bonding degree, and reduce the requirements on cleanliness and roughness on the basis of ensuring tight bonding.
In a specific embodiment, the resin waterproof bonding layer 3 is a polyurethane modified waterproof bonding layer and is laid between the steel bridge deck 1 and the resin concrete layer 4; the following effects can be achieved after the polyurethane modification: on one hand, the waterproof performance of the waterproof material can effectively protect the surface of the steel bridge deck plate 1 from being corroded by oxidation, so that the service life of the waterproof material is prolonged; on the other hand, the polyurethane modified waterproof bonding layer has strong bonding performance, so that the steel bridge deck 1 and the pavement layer above the steel bridge deck can be tightly combined without welding shear nails, and the construction process is simplified.
In a specific embodiment, the resin concrete layer 4 is a silane coupling agent-modified resin concrete layer; further, steel fibers are used to enhance the hardness. The effect of increasing the tensile strength of the resin concrete layer 4 by the amount of the steel fibers is different, and in the specific construction process, the length of the steel fibers is preferably 3 mm to 18 mm, and the addition mass of the steel fibers is 0.5 percent to 3.5 percent of the mass of the resin concrete layer, which is adjusted according to different conditions and requirements.
In a specific embodiment, the fiber material layer 5 and the gravel wearing layer 6 are preferable, and can be selected according to actual conditions in the specific implementation process. Wherein, the fiber material layer 5 is laid on the upper side of the resin concrete layer 4, and the thickness of the fiber cloth is preferably 0.1 mm to 4 mm. When in laying, the adhesive is used for soaking the cloth; the binder that this embodiment used is modified through polyurethane, and in this technical scheme, fibrous material layer 5's laying has increased the whole anti-fission performance of steel bridge deck pavement structure, and on the other hand, the waterproof nature of binder also can effectively protect lower floor's pavement structure.
In the embodiment, the arrangement of the crushed stone wearing layer 6 increases the toughness of the upper layer of the steel bridge deck pavement structure, so that the steel bridge deck pavement structure has certain deformation capacity, and in addition, the pavement of the crushed stone wearing layer 6 requires 50-70% of crushed stones to be embedded with a binder. The embedded volume of the broken stone is too small and is easy to fall off in the using process, and the performances of noise reduction, skid resistance and the like of the broken stone wearing layer are influenced by too much embedding, so the preferable scheme is obtained based on test detection.
[ second embodiment ]
The embodiment provides a construction method of a composite resin concrete steel bridge deck pavement structure, which comprises the following steps:
s10: and performing shot blasting rust removal treatment on the steel bridge deck plate to enable the surface roughness of the steel bridge deck plate to reach 50-100 microns.
S20: arranging a steel bar net piece above the steel bridge deck, and controlling the height of the steel bar net piece by using a cushion block;
coating a resin waterproof adhesive on the surface of the steel bridge deck, wherein the resin waterproof adhesive is required to be finished within 2-4 h after shot blasting rust removal of the steel bridge deck to form a resin waterproof adhesive layer; wherein the dosage of the resin waterproof binder is 0.1 kg/square meter to 1.0 kg/square meter.
S30: spreading resin concrete above the resin waterproof bonding layer, and wrapping the reinforcing mesh to form a resin concrete layer; wherein the resin concrete comprises aggregate and a binder.
Preferably, the resin concrete is reinforced by adding steel fibers, the length of the steel fibers is 3 mm to 18 mm, and the adding amount is 0.5 percent to 3.5 percent. Firstly, uniformly mixing the steel fiber and the aggregate, and then adding the binder for secondary mixing.
S40: before the resin concrete is cured, laying fiber cloth on the surface of the resin concrete; so that the binder is separated out and the fiber cloth is completely soaked; when the fiber cloth can not be completely soaked, the fiber cloth is covered by adopting a mode of manually coating the adhesive.
S50: laying a broken stone wearing layer by adopting a glue precipitation method or a spreading method.
S60: naturally curing for at least 4 hours, and opening the traffic.
When the adhesive is deposited by the adhesive depositing method, if the adhesive is not uniformly separated, the treatment method is as follows.
1. In the paving process, when the surface binder of a partial paving area is not sufficiently separated out:
firstly, a plastering plate is used for separating out the binder by manually beating and extracting the slurry.
Secondly, a small amount of fine sand is mixed with the binder, and the fine sand accounts for 35 to 45 percent. And filling up the area with insufficient adhesive through a brush after mixing.
2. When the binder is excessively precipitated on the surface of a part of the paving area and completely submerges the surface layer broken stone, spreading broken stone with larger grain diameter, slightly vibrating and leveling by using a leveling plate, partially embedding 50-75% of broken stone particles into the binder, and keeping the other part in an exposed state.
And finally, finishing paving.
[ third embodiment ]
The embodiment demonstrates the beneficial effects of the technical scheme provided by the invention by combining specific experimental data.
The test piece 2 comprises the following structures from bottom to top: steel bridge deck, resin waterproof bonding layer, resin concrete layer; wherein, the resin concrete layer is reinforced by steel fibers.
The test piece 3 includes the following structure from bottom to top: steel bridge deck, resin waterproof bonding layer, resin concrete layer; wherein, the middle of the resin concrete layer is added with a steel bar net.
The test piece 4 comprises the following structures from bottom to top: steel bridge deck, resin waterproof bonding layer, resin concrete layer, fibre material layer.
The construction method of the test pieces 1 to 4 is referred to the second embodiment.
The performance of the test pieces 1 to 4 is detected by a method specified in test procedure for asphalt and asphalt mixtures for road engineering (JTG E20), which specifically comprises the following steps:
1. detecting the rutting stability (70 ℃) of the test piece according to the method provided by T0719;
2. detecting the freeze-thaw splitting strength ratio of the test piece according to the method provided by T0729;
3. detecting the low-temperature bending limit strain (-10 ℃, 50 mm/min) of the test piece according to the method provided by T0715;
4. detecting the bending strength of time according to the method provided by T0715;
the compressive strength of the test piece is detected by using the concrete strength test evaluation standard (GB/T50107-2010).
The results are shown in Table 1.
TABLE 1
It can be seen from the table that in the technical scheme provided by the invention, the addition of the steel fibers, the reinforcing mesh and the fiber cloth respectively has favorable influence on the comprehensive performance of the steel bridge deck pavement structure.
[ fourth example ] A
As shown in fig. 4, the present embodiment provides a paving structure of a steel bridge deck, which sequentially comprises a deck steel plate 1, a resin bonding layer 3, a resin concrete layer 4, and a gravel wearing layer 6 from bottom to top, wherein the resin concrete layer 4 is formed by compounding 5 composite layers of resin concrete and a gravel reinforcing layer.
In one embodiment, the steel bridge deck 1 is shot blasting derusting steel bridge deck, the cleanliness of the steel bridge deck needs to reach Sa2.5 grade, and the roughness of the steel bridge deck is between 50 and 100 micrometers. The cleanliness and the roughness influence the adhesion tightness between the steel bridge deck plate 1 and other layered structures, and further influence the overall service life of the steel bridge deck pavement structure; the set indexes balance the difficulty of the shot blasting rust removal process and the relation between the difficulty and the bonding degree, and reduce the requirements on cleanliness and roughness on the basis of ensuring tight bonding.
In a specific embodiment, the resin waterproof bonding layer 3 is a polyurethane modified waterproof bonding layer and is laid between the steel bridge deck 1 and the resin concrete layer 4; the polyurethane modified waterproof binder contains zinc powder, the mass fraction of the zinc powder accounts for more than 85% of that of the polyurethane modified waterproof binder, the heavy corrosion prevention requirement is met, the average particle size of the zinc powder is less than 10 micrometers, and the purity of the zinc powder is more than 98%. The functional groups in the polyurethane modified waterproof adhesive comprise hydroxyl, amino and double bonds, and can react with the corresponding functional groups of the resin concrete to form a whole, so that the adhesive property is improved. The viscosity of the resin binder 3 should not be too high, and the thickness is controlled to be 400-800 μm, so that the resin binder can fully permeate into the base layer capillary of the bridge deck steel plate 1, sealing and sealing are realized, chloride ions are prevented from permeating and corroding the base layer, and a good waterproof effect is realized.
In one embodiment, the resin concrete layer 4 composed of 5 layers of the polyurethane-modified concrete and the quartz sand is obtained by alternately laying the polyurethane-modified concrete and the quartz sand in this order. The resin concrete layer 4 is made of thermosetting high polymer materials, the dynamic stability of the track is more than 10000 times/mm at 90 ℃, the elastic deformation ratio is more than 90%, the lower layer is protected from being directly damaged, meanwhile, a rough surface is provided for better bonding of the gravel wearing layer 6, and the phenomenon of pushing and delaminating caused by surface layer pavement is prevented. Wherein CaCO accounting for 0-50 percent of the total mass ratio is added in advance into the polyurethane modified concrete30-90% of filler, 0-5% of glass fiber, coupling agent and curing agent, the viscosity of the polyurethane modified concrete is controlled to be 0.1-1000 Pa.S, the curing time is less than 6 hours, the polyurethane modified concrete is mixed without heating, rolling and forming after paving, vibrating and leveling. The broken stone particles are selected from single-particle-size quartz sand with good firmness and high silicon content to improve the anti-shearing capability, the particle size is 0.85-3.0 mm, and the spreading amount is 0.2-0.6 kg/m2. Before the single-grain-diameter quartz sand is laid on the polyurethane modified concrete, the polyurethane modified concrete is soaked by a silane coupling agent for pretreatment, so that the cohesiveness between the polyurethane modified concrete and broken stone grains is improved. Before the single-grain-size quartz sand is laid on the polyurethane modified concrete on the uppermost layer, the single-grain-size quartz sand is pre-coated with asphalt, so that the connection performance between the resin concrete layer 4 and the gravel wearing layer 6 is improved. Wherein the thickness of each layer of polyurethane modified concrete and quartz sand is controlled to be 1-10mm, the thickness of the whole resin concrete layer 4 is controlled to be 10-50mm, and the resin concrete layer 4 can disperse load by a certain thickness.
In a specific embodiment, the gravel wearing layer 6 is obtained by mixing, stirring and uniformly paving aggregate and high-elastic modified asphalt according to the mass ratio of 100 (5-7), the thickness of the gravel wearing layer 6 is controlled to be 20-50mm, and the aggregate is composed of basalt gravel, limestone gravel and limestone mineral powder.
In this embodiment, when the worn-out layer 6 is damaged or reaches the service life, the worn-out layer 6 is milled, the resin concrete layer 4 is cleaned, and the aggregate and the high-elasticity modification are mixed, stirred and laid again to obtain a new worn-out layer 6, so that the pavement structure is convenient to maintain, low in maintenance cost and high in maintenance speed.
[ fifth embodiment ]
The embodiment provides a paving method of a bridge deck pavement structure, which has low requirements on construction environmental conditions, relatively low construction cost, convenient construction and easy quality control, and comprises the following steps:
s10: performing shot blasting on the bridge deck steel plate to enable the steel plate to reach Sa2.5 grade, and enabling the roughness to reach 50-100 mu m;
s20: coating a polyurethane modified waterproof adhesive on the bridge deck after shot blasting, cleaning and drying, wherein the viscosity of the polyurethane modified waterproof adhesive is not too high, so that the polyurethane modified waterproof adhesive can fully penetrate into capillary pores of a base layer and seal the capillary pores of the base layer, and the dosage of the polyurethane modified waterproof adhesive is 0.1-1.0 kg/square meter, so as to form a resin adhesive layer 3;
s30: continuously stirring the polyurethane modified concrete by using a concrete mixer, uniformly spreading the polyurethane modified concrete which is sprayed and stirred by a machine in a construction area before the polyurethane modified waterproof binder is cured, controlling the thickness to be 1-10mm, and carrying out polymerization reaction on the contact surface of the lower layer of the polyurethane modified concrete and the polyurethane modified waterproof binder to cure and bond;
s40: uniformly spreading customized discontinuous graded broken stones on the uncured polyurethane modified concrete in a mechanical mode, wherein the grain diameter of the broken stones is not less than 1mm and not more than 10mm, and the broken stones are embedded into the polyurethane modified concrete by the self gravity of the broken stones so that about half of the lower parts of the broken stones are embedded into the polyurethane modified concrete, or the broken stones can be pressed in a mechanical mode so as to be uniformly dispersed and distributed, and a stable polyurethane modified concrete-broken stone structure is formed;
s50: cleaning the broken stones which are not firmly bonded after the first polyurethane modified concrete-gravel layer is cured;
s60: repeating the steps S30-S50 for 3-5 times to form a plurality of layers of polyurethane modified concrete-gravel layers as the resin concrete layer 4, wherein the total thickness of the resin concrete layer 4 is 25-50 mm;
s70: after the resin concrete layer 4 is constructed, the broken stone wearing layer 6 is paved, the SMA asphalt concrete is paved, the paving temperature is generally not lower than 140 ℃, reasonable construction organization is carried out according to the holding time of the broken stone wearing layer 6 asphalt concrete and the supply condition of mechanical equipment, the supply of a skip car is ensured, and the paving of a paver and the rolling of a road roller are carried out scientifically and orderly.
The polyurethane modified concrete can be added with reinforcing materials in a pre-mixing mode, so that the viscosity is improved, the concrete is prevented from being too high in fluidity and incapable of forming a concrete bed with a certain thickness, and the reinforcing materials can comprise fiber materials, fillers, thickening agents and the like; the additives can be added into the concrete one by one in a field stirring mode, the accuracy of the added components is ensured by adopting automatic metering and other modes, scientific process standards are required, sufficient stirring is ensured, and sufficient operation time is reserved.
The properties of the polyurethane modified waterproofing binder used in this example are shown in table 2:
TABLE 2 technical indices of polyurethane-modified waterproof Binders
The properties of the polyurethane modified concrete used in this example are shown in table 3:
TABLE 3 technical requirements of polyurethane modified concrete
The bridge deck pavement structure test piece prepared by the embodiment is subjected to test tests on shear strength, pull strength and rutting dynamic stability, and the test data are shown in table 4.
TABLE 4
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A composite resin concrete steel bridge deck pavement structure is characterized in that,
steel bridge deck pavement structure from the bottom up includes in proper order: steel bridge deck, resin waterproof bonding layer, resin concrete layer;
and a reinforced layer is laid in the resin concrete layer and comprises a steel bar net and/or a fiber material and/or broken stone particles.
2. The steel deck pavement structure according to claim 1,
the resin waterproof bonding layer comprises at least one of the following components or the combination thereof: a polyurethane modified waterproof bonding layer, an epoxy resin modified waterproof bonding layer and a methyl methacrylate modified waterproof bonding layer; and/or
The resin concrete layer comprises at least one or a combination of the following: a silane coupling agent modified resin concrete layer, a titanate coupling agent modified resin concrete layer and an aluminate coupling agent modified resin concrete layer.
3. The steel deck pavement structure according to claim 1,
the fibrous material comprises at least one of the following or a combination thereof: glass fibers, carbon fibers, boron fibers, asbestos fibers, steel fibers; and/or
The reinforcing steel bar mesh comprises reinforcing steel bars which are longitudinally and transversely arranged at certain intervals and form an angle with each other, the diameter of each reinforcing steel bar is 1-15 mm, and/or the distribution interval of the reinforcing steel bars is 20-300 mm; and/or
The particle size of the crushed stone particles is 1mm to 10 mm.
4. The steel deck pavement structure according to claim 1,
the resin concrete layer is reinforced by reinforced fibers, and the length of the reinforced fibers is 3-18 mm; and/or
The adding mass of the reinforced fiber is 0.5-3.5% of the mass of the resin concrete layer.
5. Steel deck pavement structure according to any one of claims 1 to 4,
the steel bridge deck pavement structure further comprises a fiber cloth layer, wherein the fiber cloth layer is arranged above the resin concrete layer, and the thickness of the fiber cloth layer is 0.1-4 mm; and/or
The steel bridge deck pavement structure further comprises a broken stone wearing layer, wherein the broken stone wearing layer is formed by paving resin broken stones with surface discontinuous grading, and the broken stone wearing layer is arranged above the resin concrete layer.
6. A construction method of a steel bridge deck pavement structure, characterized in that the construction method is used for obtaining the steel bridge deck pavement structure according to any one of claims 1 to 5, and comprises the following steps:
s10: performing shot blasting rust removal treatment on the steel bridge deck plate to enable the surface roughness of the steel bridge deck plate to reach 50-100 microns;
s20: coating a resin waterproof adhesive on the surface of the steel bridge deck plate to form the resin waterproof adhesive layer, wherein the dosage of the resin waterproof adhesive is 0.1-1.0 kg/m;
s30: and spreading resin concrete on the resin waterproof bonding layer to form the resin concrete layer.
7. The construction method according to claim 6,
also between the S10 and the S20 is S40: laying a reinforcing layer above the steel bridge deck; and/or
The S30 specifically includes: spreading resin concrete on the resin waterproof bonding layer, spreading a reinforcing layer on the resin concrete to form the resin concrete layer, and/or alternatively carrying out the steps at least once.
8. The construction method according to claim 6 or 7, wherein in the S30, the resin concrete includes aggregate and a binder.
9. The construction method according to claim 6 or 7,
the S30 is followed by S50: paving a broken stone wearing layer on the resin concrete layer;
the gravel wearing layer is formed by pre-mixing gravel and a binder and then paving the mixture; and/or
The broken stone wearing layer is formed by coating an adhesive on the resin concrete layer, spreading broken stones on the resin concrete layer and paving the broken stones.
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