CN210104563U - Pavement structure of steel bridge deck - Google Patents
Pavement structure of steel bridge deck Download PDFInfo
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- CN210104563U CN210104563U CN201822190756.3U CN201822190756U CN210104563U CN 210104563 U CN210104563 U CN 210104563U CN 201822190756 U CN201822190756 U CN 201822190756U CN 210104563 U CN210104563 U CN 210104563U
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Abstract
The utility model provides a structure of mating formation of steel bridge floor. The pavement structure of the steel bridge deck comprises a first waterproof bonding layer, a modified epoxy asphalt gravel layer, a second waterproof bonding layer and an ultrahigh-performance structural layer which are sequentially paved on the surface of a steel plate of the steel bridge deck; the ultrahigh-performance structural layer is a pavement structural layer taking high-molecular polymer modified asphalt as a binder, or comprises a pavement structural layer taking high-molecular polymer modified asphalt as a binder and a third waterproof bonding layer; the second waterproof bonding layer and the third waterproof bonding layer are layers formed by at least one material of epoxy emulsified asphalt, high-molecular polymer modified asphalt and high-molecular polymer modified emulsified asphalt. The utility model provides a structure of mating formation of steel bridge floor has better tolerance and stability.
Description
Technical Field
The utility model belongs to the technical field of steel bridge face design, construction and maintenance repair, especially relate to a steel bridge face's structure of mating formation.
Background
A main beam structure of a large-span cable bearing structure bridge built in China basically adopts orthotropic steel panels and thin layers to form a bridge travelling system structure. The orthotropic steel bridge deck structure has the problems that the elasticity performance in the transverse and longitudinal directions is different, and the rigidity of the bridge deck at different positions in the same direction is different, influences the rigidity and deformation nonuniformity of a steel bridge deck, and also puts higher requirements on the pavement performance of the bridge deck. In addition, in China, due to improper use conditions or problems of design, construction and the like, the steel bridge deck is damaged by cracks, oil bleeding, crowding, rutting, loosening, pushing, delaminating and the like during the service period, and the safety, the comfort and the durability of the bridge structure of the travelling crane are directly influenced.
In the aspect of the design concept of steel bridge deck pavement, due to the limits of application range, theoretical support and time, daily inspection is needed. Due to the inconsistency of the mechanical analysis, the calculation theory and the method of the orthotropic steel bridge deck pavement system, the material characteristic difference of the pavement mixture, and the comprehensive influence of load, construction and environmental conditions, the design theory is imperfect. The lack of a design method for pathological feature research cannot achieve symptomatic medication.
In the aspect of the construction of steel bridge deck pavement, the following problems exist: epoxy asphalt concrete is mostly adopted at the present stage in China, epoxy asphalt adhesives and binders required by waterproof adhesive layer and surface layer mixtures are mainly imported from foreign countries, and the stability and durability of the epoxy asphalt concrete are difficult to master and judge. The mineral powder is selected mainly by considering the physical indexes such as fineness, hydrophobicity and the like, active lime is not contained, but no additional requirement is imposed on harmful impurities in the mineral powder, if the mineral powder is doped with metal minerals, rusting can be caused by electrochemical reaction, the integrity and the waterproof effect of a pavement structure are weakened, and potential hidden danger is brought. During large-scale construction, in order to improve production efficiency, a construction unit can refit or process a special spraying machine tool, the mechanized spraying process is adopted, insufficient reaction can be caused due to the fact that materials are only in short contact in the air, the bonding effect is reduced, and the sprinkling devices are not strictly calibrated, lack of accurate metering control and can cause the conditions of excess, leakage or lack of sprinkling. In addition, the epoxy asphalt steel bridge deck pavement usually adopts block pavement and layered pavement according to the field condition, and the sawing seam mode and the position of a construction joint are selected, so that the weak areas are damaged under the conditions of heavy load and large traffic volume after the operation is opened in the future under the local impact action of wheels.
In the aspect of maintenance of steel bridge deck pavement, the steel bridge deck pavement in China lacks an effective preventive maintenance method, and the development of diseases is accelerated under adverse environments such as high temperature, heavy rain, freezing and pollution and under overweight and overload running conditions.
According to the analysis, the factors influencing the performance of the pavement structure of the steel bridge deck in China are very complex, so that the pavement structure of the steel bridge deck is poor in tolerance and poor in stability.
Therefore, it is desired to provide a pavement structure of a steel deck having good durability and stability.
SUMMERY OF THE UTILITY MODEL
Based on this, the utility model discloses a main objective provides a structure of mating formation of steel bridge floor, should mate the structure that endures well, stability is good.
The utility model aims at realizing through the following technical scheme:
the pavement structure of the steel bridge deck comprises a first waterproof bonding layer, a modified epoxy asphalt gravel layer, a second waterproof bonding layer and an ultrahigh-performance structural layer which are sequentially paved on the surface of a steel plate of the steel bridge deck;
the first waterproof bonding layer is a modified epoxy resin layer;
the ultrahigh-performance structural layer is a pavement structural layer taking high-molecular polymer modified asphalt as a binder, or comprises a pavement structural layer taking high-molecular polymer modified asphalt as a binder and a third waterproof bonding layer;
the second waterproof bonding layer and the third waterproof bonding layer are layers formed by at least one material of epoxy emulsified asphalt, high-molecular polymer modified asphalt and high-molecular polymer modified emulsified asphalt.
In some embodiments, the first waterproof bonding layer has a modified epoxy layer laid in an amount of 0.4-0.6kg/m2。
In some of these embodiments, the modified epoxy asphalt macadam layer has a porosity of 1-3%.
In some of the embodiments, the thickness of the modified epoxy asphalt crushed stone layer is 0.5-2 cm.
In some embodiments, the ultra-high performance structural layer is a pavement structural layer using high molecular polymer modified asphalt as a binder, the dynamic viscosity of the high molecular polymer modified asphalt at 60 ℃ is greater than 200000pa.s, and the thickness of the ultra-high performance structural layer is 30-50 mm.
In some embodiments, the ultra-high performance structure layer includes a pavement structure layer using high molecular polymer modified asphalt as a binder, and a third waterproof bonding layer, and the ultra-high performance structure layer sequentially includes a pavement structure layer with a thickness of 30-50mm using high molecular polymer modified asphalt as a binder, a third waterproof bonding layer, and a pavement structure layer with a thickness of 8-15mm using high molecular polymer modified asphalt as a binder, and the dynamic viscosity of the high molecular polymer modified asphalt at 60 ℃ is greater than 200000 pa.s.
In some of these embodiments, the pavement structure layer having a thickness of 8-15mm has a porosity of 18-25%.
In some embodiments, the ultra-high performance structure layer includes a pavement structure layer using high molecular polymer modified asphalt as a binder, and a third waterproof bonding layer, and the ultra-high performance structure layer sequentially includes a pavement structure layer with a thickness of 30-50mm using high molecular polymer modified asphalt as a binder, a third waterproof bonding layer, and a pavement structure layer with a thickness of 15-25mm using high molecular polymer modified asphalt as a binder, and the dynamic viscosity of the high molecular polymer modified asphalt at 60 ℃ is greater than 200000 pa.s.
In some of these embodiments, the ultra-high performance structural layer has a thickness of 3.8-5.5 cm.
In some of the embodiments, the surface of the steel plate is surface sand blasting to a surface roughness of 2.0-3.0.
Compared with the prior art, the utility model discloses possess following beneficial effect:
the utility model discloses a lay first waterproof tie coat, modified epoxy pitch metalling, the waterproof tie coat of second, ultra high performance structural layer in proper order on the steel sheet surface of steel bridge face, form a neotype steel bridge face composite construction of mating formation. In the composite structure:
the first layer is a modified epoxy resin layer, and the second layer is a modified epoxy asphalt gravel layer. The modified epoxy asphalt gravel layer takes modified epoxy resin and matrix asphalt as a gravel binding material, the surface of the gravel is coated by the modified epoxy asphalt, and the gravel is uniformly distributed in the modified epoxy asphalt, firmly embedded and tightly bonded with a steel plate through a first waterproof bonding layer. The first waterproof bonding layer (modified epoxy resin) is strong in bonding force with the steel bridge, strong in deformation resistance and strong in shearing resistance, can effectively protect the steel bridge deck, and can be used for closely bonding the modified epoxy asphalt crushed stone layer with the steel plate of the bridge deck. When the bridge deck steel plate deforms under the action of temperature change or traveling load, the bridge deck steel plate can absorb the relative displacement between the modified epoxy asphalt gravel layer and the bridge deck steel plate, thereby realizing good followability between the pavement layer and the bridge deck steel plate, well overcoming the generation of diseases such as cracks, bulges and the like, and playing a waterproof and anticorrosion function for the steel bridge deck. In addition, the stable molecular structure of the modified epoxy resin ensures the durability of the composite structure.
The combination of the rough upper surface of the modified epoxy asphalt gravel layer and the ultrahigh-performance structural layer can effectively resist horizontal shear stress generated during vehicle operation, prevent slippage between the structural layers and ensure the stability of the composite structure. Meanwhile, a second waterproof bonding layer with good adhesion function to the modified epoxy asphalt gravel layer and the ultrahigh-performance structural layer is used in a matched mode, so that the upper layer and the lower layer of the composite structure system form a whole.
The high molecular polymer modified asphalt is used as a bonding material of an ultrahigh-performance structural layer, can improve the stability, the toughness and the high-temperature aging resistance, and ensures the durability of a steel bridge deck pavement structure.
Generally speaking, through the global design of above structural layer, the utility model discloses the structure of mating formation of steel bridge floor compares from functional, security, feature of environmental protection, travelling comfort, economic nature with traditional steel bridge deck pavement scheme and has clear and definite advantage, and construction convenience, efficient moreover have obvious advantage to the big steel bridge deck pavement overhaul engineering of traffic pressure.
Drawings
FIG. 1 is a schematic structural view of a pavement structure of a steel deck according to example 1; in the figure: 101 is a steel bridge surface, 102 is a first waterproof bonding layer, 103 is a modified epoxy asphalt gravel layer, 104 is a second waterproof bonding layer, and 105 is an ultrahigh-performance structural layer.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully below. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Example 1
This embodiment is to design the main reason that the disease produced that paves to steel bridge face such as incomplete, the construction management and control is improper, the operational environment is bad, through the pathological feature analysis of steel bridge face pavement destruction and the research that has the problem in structural design, construction, the maintenance of mating formation, provide the structure of mating formation of steel bridge face, this structure of mating formation is that first waterproof bonding layer 102, modified epoxy pitch metalling 103, second waterproof bonding layer 104, ultra high performance structural layer 105 are laid in proper order on the steel sheet surface of steel bridge face 101. The combined pavement structure has the characteristics of clear structural function, stable and durable material performance, excellent service performance, convenient construction and maintenance conditions, obvious economic and technical index advantages and the like, is a novel efficient steel bridge deck pavement system integrating safety, environmental protection, comfort, durability and wide applicability, and the result schematic diagram is shown in figure 1.
1. First waterproof adhesive layer
The steel bridge deck body system is out of shape greatly, the bridge floor steel sheet adhesion ability is low, the pavement layer destroys and comes from the following nature that bituminous concrete surface course warp to the decking not enough, it is poor to cohere the durability between the layer, and then causes the delamination between pavement layer and the bridge floor steel sheet and slides and destroy, can corrode the steel sheet under the condition that water exists, extremely unfavorable to bridge durability and safety, long-term practice proves, bond between bridge floor pavement layer and the bridge floor steel sheet and the protection problem plays crucial effect to the success of whole steel bridge deck pavement or not. Therefore, the material of the waterproof bonding layer to be in contact with the deck steel plate must be selected in consideration of basic properties such as water impermeability, low-temperature toughness, shear strength, bond strength, workability of construction, and the like. In view of these considerations, the embodiment of the present invention selects the modified epoxy resin 1 as the main functional material of the first waterproof adhesive layer.
The modified epoxy resin 1 is composed of a modified epoxy resin main agent component in forming the first waterproof bonding layer(the performance indexes are shown in the table 1) and matched curing agent components (the performance indexes are shown in the table 2) are mixed according to the mass ratio of (45-55) to (55-45), and the laying amount of the modified epoxy resin 1 is 0.4-0.6kg/m2。
TABLE 1 main Property index of modified epoxy resin 1 Main component
| Test items | Technical requirements | Test results | Test method |
| Viscosity (23 ℃ C., [ poise ]]) | 1000-5000 | 4126 | ASTM D445 |
| Epoxy equivalent | 185-205 | 194 | ASTM D1652 |
| Flash point, (COC), deg.C | ≥130 | 189 | ASTM D92 |
| Specific gravity (23 ℃ C.) | 1.1-1.3 | 1.141 | ASTM D1475 |
| Appearance of the product | Yellowish transparent liquid | Yellowish transparent liquid | Visual inspection of |
The epoxy equivalent of the modified epoxy resin 1 of the utility model is 185-plus 205, and after being distributed to the steel plate for consolidation, the drawing strength is more than 2.5MPa (25 ℃) and 0.5MPa (60 ℃).
TABLE 2 main Performance indices of the curing agent component of modified epoxy resin 1
| Test items | Technical requirements | Test results | Test method |
| Viscosity (23 ℃ C., [ poise ]]) | 500-1100 | 897 | ASTM D445 |
| Acid value (mg, KOH/g) | 130-160 | 142 | ASTM D664 |
| Flash point, (COC), deg.C | ≥145 | 175 | ASTM D92 |
| Specific gravity (23 ℃ C.) | 0.8-1.0 | 0.887 | ASTM D1475 |
| Appearance of the product | Light yellow brown liquid | Light yellow brown liquid | Visual inspection of |
Researches and practices prove that the modified epoxy resin has outstanding adhesion to steel structures and can keep good flexibility at low temperature.
TABLE 3 Properties and specifications of modified epoxy resin 1 after curing
| Test items | Technical requirements | Test results | Test method |
| Component A/B weight ratio | 45-55/55-45 | 45-55/55-45 | —— |
| StretchingStrength (25 ℃, MPa) | ≥3.0 | 3.53 | ASTM C |
| Elongation (25 ℃ C.,%) | ≥150 | 150 | ASTM C |
2. Modified epoxy asphalt crushed stone layer
The modified epoxy asphalt crushed stone layer in the embodiment is composed of 2.5-5.0% of modified epoxy resin, 2.5-5.0% of asphalt, 80-90% of stone and 5-10% of mineral powder (in percentage by mass), and is formed by stirring at high temperature (190 ℃ C.) through an asphalt stirring device, paving through an asphalt paver and compacting through a road roller, and the thickness is 5-20 mm. The modified epoxy resin 2 consists of A, B components, wherein the A component is a modified epoxy main agent with the epoxy equivalent of 190-210, and the B component is a curing agent.
The utility model discloses in, important material is modified epoxy 2, this modified epoxy 2:
(1) the modified epoxy resin 2 consists of A, B components, wherein the A component is a modified epoxy main agent with the epoxy equivalent of 190-210, and the B component is a curing agent.
(2) A, B the ratio of 50-60: after being mixed in a proportion of 50-40, the tensile strength (25 ℃) of a cured product is more than 3.5MPa, and the elongation at break is more than 150%.
The modified epoxy resin 2 and the asphalt are mixed according to the weight ratio of 45-55:55-45, the tensile strength is more than 3.0MPa, and the elongation at break is more than 150%.
The utility model discloses a modified epoxy pitch metalling possess excellent comprehensive properties, and the concrete performance is in: the ultimate bending strain of the trabecular bending test (under the condition of minus 15 ℃) is more than 3 multiplied by 10-3The bending and pulling strength is more than 40MPa, and the steel plate has super-strong flexibility and steel plate deformation coordination capacity; has dynamic stability (at 70 deg.C) of more than 10000 times/mm, and has super high temperature deformation resistanceForce; the ratio of the residual strength and the stability of the residual Marshall in the freeze-thaw cycling cleavage test are both more than 90%, and the water stability and the damp-heat aging resistance are excellent; the porosity reaches 1-3%, and a compact waterproof protective (antirust) layer is formed.
Overall speaking, the modified epoxy pitch metalling of this embodiment can be waterproof, rust-resistant, this thin layer has that the power of cohering to the steel construction is strong, the deformation space is big, high strength, the good characteristics that the ability of shearing is strong, relative displacement between layer and the decking is mated formation in the effective absorption, the effect of playing the stress absorbing layer, thereby good follower nature between layer and the bridge floor steel sheet of having realized steel bridge deck pavement has effectively been solved large-span steel structure bridge and has been out of shape and the problem of cohering layer and last structural layer, play fine additional strengthening to the bulk rigidity of steel sheet simultaneously, table 4.
TABLE 4 technical index of the performance of the modified epoxy asphalt gravel layer
3. Second waterproof adhesive layer
In order to complete bonding and waterproof work between the steel bridge deck pavement layers, a second waterproof bonding layer is paved between the modified epoxy asphalt gravel layer and the ultrahigh-performance structural layer, and the material of the second waterproof bonding layer can be high-molecular polymer modified emulsified asphalt or epoxy emulsified asphalt or high-molecular polymer modified asphalt, shown in Table 5.
TABLE 5 Pull-out test results of materials of different second waterproof adhesive layers
The high molecular polymer modified emulsified asphalt is prepared by emulsifying high-quality asphalt, an SBS modifier, an antioxidant aging agent and the like by using a special compound emulsifier, and is shown in Table 6. The high molecular polymer modified asphalt is a finished product high molecular polymer adhesive successfully synthesized by special high molecular polymer, antioxidant aging agent, stabilizer, SBS modifier and other additives and heavy traffic asphalt, and the technical standard is shown in Table 7.
TABLE 6 technical Standard for quality of high-molecular polymer modified emulsified asphalt
TABLE 7 technical Standard of Polymer modified asphalt
The technical standards of the epoxy emulsified asphalt are shown in Table 8.
TABLE 8 technical standards for quality of epoxy emulsified asphalt
| Index (I) | Unit of | Technical requirements | Test method |
| The bonding strength with cement concrete is 25 DEG C | MPa | 1.5min | T2217 |
| Tensile strength of cured product | MPa | 1.5min | T2217 |
| Elongation at break | ％ | 80min | T2217 |
| Low temperature flexibility, -25 deg.C | -- | No crack and no fracture | T2217 |
| Water impermeability, 0.3MPa, 30Min | -- | Is impervious to water | T2217 |
| Distillation solid content test | ％ | 50.0min | T2217 |
4. Ultra-high performance structural layer
The internal temperature of the steel bridge deck pavement layer is higher in hot environment in summer, and generally can reach 60-70 ℃, which is very unfavorable for the high-temperature stability of the steel bridge deck pavement layer, and the main reasons of pavement structure layer damage are that the high-temperature durability is poor and the material performance is aged and loses efficacy. Therefore, basic performances such as high temperature resistance stability, low temperature resistance toughness, durability, good road mechanical property and construction operability and the like must be considered for the bridge deck steel pavement main structural layer material.
The utility model discloses an ultra high performance structural layer is the road surface structural layer who uses high molecular polymer modified asphalt as binder, then high molecular polymer modified asphalt is greater than 200000Pa.s at 60 ℃ dynamic viscosity, the thickness of ultra high performance structural layer is 30-50mm, corresponds following ultra high performance structural layer 1. Or the ultrahigh-performance structural layer comprises a pavement structural layer and a third waterproof bonding layer, wherein the pavement structural layer takes high-molecular polymer modified asphalt as a binder, the pavement structural layer (ultrahigh-performance structural layer 1) is 30-50mm thick and takes the high-molecular polymer modified asphalt as the binder, the third waterproof bonding layer and the pavement structural layer (ultrahigh-performance structural layer 2) is 8-15mm thick and 18-25% in porosity and takes the high-molecular polymer modified asphalt as the binder, and the dynamic viscosity of the high-molecular polymer modified asphalt at 60 ℃ is greater than 200000 Pa.s. Or the ultrahigh-performance structural layer comprises a pavement structural layer and a third waterproof bonding layer, wherein the pavement structural layer and the third waterproof bonding layer take high-molecular polymer modified asphalt as a binder, the pavement structural layer (the ultrahigh-performance structural layer 1) is 30-50mm thick and takes the high-molecular polymer modified asphalt as the binder, the third waterproof bonding layer and the pavement structural layer (the ultrahigh-performance structural layer 3) is 15-25mm thick and takes the high-molecular polymer modified asphalt as the binder, and the dynamic viscosity of the high-molecular polymer modified asphalt at 60 ℃ is greater than 200000 Pa.s.
The ultra-high performance structural layer is covered on a pavement surface layer or used as a pavement structural layer, epoxy emulsified asphalt or high-molecular polymer modified asphalt is used as a waterproof bonding layer, and high-molecular polymer modified asphalt is used as a binder for design, so that the waterproof structural layer and the drainage type wearing layer with excellent pavement performance have stable structure and good ageing resistance and rutting resistance. In addition, the ultrahigh-performance asphalt pavement structure 2 and the ultrahigh-performance asphalt pavement structure 3 have good waterproof, drainage, anti-skid, noise reduction and cooling effects, and can circularly recover the pavement performance of the wearing layer through preventive maintenance measures, so that the purpose of prolonging the service life is achieved.
High molecular polymer modified asphalt with excellent performance is selected as a structural binder, and a high-quality standard mixture with stable performance, good toughness and strong high-temperature aging resistance is produced.
The ultra-high performance structure layer 1 (the layer thickness is 30-50mm), the binding material adopts ultra-high viscosity (the dynamic viscosity at 60 ℃ is more than 200000Pa.s) high molecular polymer asphalt, and the construction process is the same as that of the conventional modified asphalt pavement.
And laying an open-graded large pore (porosity is 18-25%) ultrahigh-performance structural layer 2 (layer thickness is 8-15mm) or an ultrahigh-performance structural layer 3 (thickness is 15-25mm) on the ultrahigh-performance structural layer 1. The binding material also adopts high molecular polymer asphalt with ultra-high viscosity (dynamic viscosity at 60 ℃ is more than 200000 Pa.s).
The second waterproof bonding layer between the modified epoxy asphalt gravel layer and the ultra-high performance structural layer 1 is high-performance epoxy emulsified asphalt or high-molecular polymer modified emulsified asphalt.
High molecular polymer modified emulsified asphalt is adopted between the ultrahigh-performance structural layer 1 and the ultrahigh-performance structural layer 2 (or the ultrahigh-performance structural layer 3) as a third waterproof bonding layer, and the spreading of the third waterproof bonding layer and the paving construction of the mixture of the ultrahigh-performance structural layer 2 (or the ultrahigh-performance structural layer 3) are synchronously completed by adopting a special integrated paver. The ultra-high performance structural layer 1 and the ultra-high performance structural layer 2 (or the ultra-high performance structural layer 3) are sequentially far away from the surface of the steel plate.
The comprehensive performance and key technical indexes of the mixture of the ultra-high performance structural layer are obviously higher than those of other similar products and standard requirements, and are shown in tables 9, 10 and 11.
TABLE 9 technical index for mixture Marshall test mix proportion design of ultra-high performance structural layer 1
TABLE 10 technical index for mixture Marshall test mix design of ultra high performance structural layer 2
TABLE 11 technical index for mixture Marshall test mix design of ultra high performance structural layer 3
| Detecting items | Unit of | Technical requirements | Test method |
| Void fraction | ％ | 18-25 | T0708 |
| Oil film thickness of not less than | μm | 14 | Computing |
| Water permeability not less than | cm2/s | 0.04 | Marshall test piece |
| Marshall stability of not less than | KN | 5 | T0709 |
| Leakage loss of not more than | ％ | 0.3 | T0732 |
| Kenter castle scattering loss of not more than | ％ | 10 | T0733 |
| Dynamic stability of rut test of not less than | Sub/mm | 5000 | T0719 |
| Residual stability of not less than | ％ | 80 | T0790 |
| Ratio of residual strength of freeze-thaw cycle | ％ | 85 | T0729 |
TABLE 11 Performance index of ultra-high Performance Structure layer 1 mixture
The utility model discloses a steel bridge deck pavement structure gross thickness can be 60 mm.
Example 2
The embodiment provides a construction method of a pavement structure of a steel bridge deck, which comprises the following steps:
1. construction of first waterproof bonding layer and modified epoxy asphalt gravel layer
(1) And (2) carrying out sand blasting on the surface of the steel bridge deck steel plate until Sa2.5, removing dust, drying and preventing pollution, and constructing a first waterproof bonding layer (the mass ratio of the modified epoxy resin 1 to the curing agent is 45-55:55-45) within 4h after the steel plate is treated so as to ensure air isolation.
The first waterproof bonding layer is constructed by mechanically spraying or brushing 1.5kg/m with a roller brush2。
(2) And after the modified epoxy resin 1 (the modified epoxy resin main agent component and the matched curing agent component are mixed according to the mass ratio of 45-55:55-45) is completely spread, curing the obtained first waterproof bonding layer until the resin reaches the required hardening degree.
(3) The main agent and the curing agent of the modified epoxy resin 2 are as follows according to the mass ratio (50-60): (50-40) mixing to form a mixture, and mixing the mixture and the matrix asphalt according to the mass ratio of 1: 1, curing and forming under a certain temperature condition to form the epoxy asphalt binder; the epoxy asphalt binder is mixed with stone and mineral powder to obtain a modified epoxy asphalt gravel layer mixture, wherein the modified epoxy asphalt gravel layer mixture consists of modified epoxy resin 2 (2.5-5.0%), asphalt (2.5-5.0%), stone (80-90%) and mineral powder (5-10%).
The production and the manufacture of the modified epoxy asphalt gravel layer mixture are almost the same as the production and the manufacture of a common asphalt mixture, but in the production process, the following points need to be noticed that ① modified epoxy resin 2 is put into a mixing plant and is sprayed with matrix asphalt, the mixing temperature of ② is about 170-185 ℃, the temperature is set to be slightly higher when the air temperature is low and the conveying distance is short, the temperature is set to be lower when the air temperature is high and the conveying distance is short, and the mixing time of ③ is 45-50 seconds after the modified epoxy resin 2 is put into the mixing plant.
(4) The construction of the modified epoxy resin asphalt gravel layer is controlled according to the loose paving coefficient of 1.24. The primary rolling (internal temperature at the beginning: 155 ℃ or higher) must be performed immediately after the spreading, and the secondary rolling (surface temperature at the beginning: 110 ℃ or higher) is performed immediately after the end of the primary rolling, and the number of passes is 12. The surface temperature at the start of final pressure is 90 ℃ or higher. And finishing and cleaning immediately after rolling.
(5) As the hardening reaction of the epoxy resin is increased, the strength of the epoxy resin is also increased, and the epoxy resin needs to be cured for 24 hours at normal temperature.
2. Construction of second waterproof bonding layer and ultrahigh-performance structural layer
Firstly, laying a second waterproof bonding layer (epoxy emulsified asphalt or high-molecular polymer modified asphalt) on the modified epoxy asphalt gravel layer, and constructing the ultrahigh-performance structural layer by one-time laying within 2-3 hours after construction.
The paving process of the step is the same as that of an SMA (mixture of asphalt, mastic and macadam) pavement layer, but in the aspect of raw material control, the use performance grading of an ultrahigh-performance structural layer must be ensured to reach PG82-22, and in addition, the technical indexes of the high-molecular polymer modified asphalt must meet the requirements of 'table 7', and attention is paid to the following steps:
(1) the viscosity of the high molecular polymer modified asphalt is high, so that the construction temperature can be properly increased during mixing and paving, the mixing temperature of the mixture is controlled to be 175-185 ℃, the leaving temperature of the mixture cannot be lower than 170 ℃, the temperature of the mixture conveyed to the site is not lower than 160 ℃, and the high temperature following the paving and the low-amplitude high-frequency rolling are strictly carried out, so that the quality of each link of the production, the paving and the rolling of the mixture is ensured, and the influence of the vibration rolling on a steel structure is reduced as much as possible.
(2) When the temperature is lower than 10 ℃ and the mixture cannot be paved in strong wind and rainy days, for example, when other procedures are carried out at the temperature of 0-10 ℃, effective measures for ensuring the construction quality must be taken. As long as the difference between the temperature of the bridge deck and the dew point is more than 3 ℃, the fog and high humidity can not influence the performance of the construction and modified epoxy asphalt gravel layer.
(3) The mixture of the ultra-high performance structural layer is suitable for being mixed with other materials, if the mixture needs to be stored for a short time due to production or other reasons, the storage time is not longer than 24 hours, the temperature drop during the storage period is not longer than 10 ℃, and binder aging, dripping and coarse aggregate particle segregation are not caused.
(4) The paving temperature of the mixture of the ultra-high performance structural layer is controlled to be more than 170 ℃, and the mixture is paved for one-time forming, so that manual repair is not allowed.
(5) The road surface temperature can not be opened before being cooled to 50 ℃.
The high molecular polymer modified emulsified asphalt is sprayed at the temperature of 60-80 ℃, the spraying amount is controlled to be 1.0-1.2kg per square meter, and accurate measurement is needed to ensure even spraying. If necessary, the amount of spreading is adjusted on site by engineers according to the specific road surface conditions.
The embodiment of the utility model provides an advantage of the structure of mating formation of steel bridge face includes:
1. the modified epoxy asphalt gravel layer is used, and the modified epoxy resin 2 and the matrix asphalt are used as gravel binding materials. 100% of the surface of the macadam is coated by the modified epoxy resin, and the macadam is uniformly distributed in the resin, firmly embedded and tightly bonded with the steel plate. The first waterproof bonding layer (modified epoxy resin 1) is strong in bonding force with a steel bridge, strong in deformation resistance and strong in shearing resistance, can effectively protect the steel bridge deck, and can be used for closely bonding the modified epoxy asphalt crushed stone layer with a steel plate of the bridge deck. When the bridge deck steel plate deforms under the action of temperature change or traveling load, the bridge deck steel plate can absorb the relative displacement between the modified epoxy asphalt gravel layer and the bridge deck steel plate, thereby realizing good followability between the pavement layer and the bridge deck steel plate, well overcoming the generation of diseases such as cracks, bulges and the like, and playing a waterproof and anticorrosion function for the steel bridge deck. In addition, the stable molecular structure of the modified epoxy resin ensures the durability of the structure.
2. The combination of the rough upper surface of the modified epoxy asphalt gravel layer and the ultra-high performance structural layer can effectively resist horizontal shear stress generated during vehicle operation, prevent slippage between the structural layers and ensure the stability of the structure. Meanwhile, a second waterproof bonding layer (high-molecular polymer modified emulsified asphalt or epoxy emulsified asphalt or high-molecular polymer modified asphalt which has a good adhesion function to the mixture of the modified epoxy asphalt gravel layer and the ultrahigh-performance structural layer is used as a bonding material), so that the upper layer and the lower layer of the structural system form a whole.
3. The ultra-high performance structural layer is used, and the high molecular polymer modified asphalt is used as a structural layer bonding material. The high-quality standard mixture with stable performance, good toughness and strong high-temperature aging resistance is produced, and the durability of the main body structure is ensured.
4. The utility model discloses the structure of mating formation of steel bridge floor compares from functional, security, feature of environmental protection, travelling comfort, economic nature with other steel bridge floor pavement schemes and has clear and definite advantage, and convenient construction, efficient has obvious advantage to the big overhaul engineering of traffic pressure moreover, table 18.
TABLE 18 comparison of the paving structure of steel bridge deck of the present invention with the domestic main steel bridge deck structure
The utility model provides an above-mentioned neotype steel bridge deck pavement composite construction to put into practice: in the early 2011, the inventor of the utility model carries out investigation, test and analysis of on-site pathological reasons; in the autumn of 2012, construction of a composite structure test section (a modified epoxy asphalt gravel layer and an ultrahigh-performance structural layer) is carried out at the most unfavorable position of the load of a large-section suspension bridge with the span of more than kilometers; after 2 years, no surface disease is found, the on-site core-pulling and drawing tests meet the design index requirements, and the structural mechanical property is proved to be stable; in autumn of 2014, the steel bridge deck emergency lane overhaul is determined to be carried out by adopting a novel bridge deck combined structure through summary demonstration, the quality is guaranteed for 3 years, the maintenance is carried out for 5 years, the use is guaranteed for 10 years, the fine entry is carried out, and the quality is the first fundamental guide for overhaul projects; in 2018, the use condition of the overhaul project is good. Compared with the epoxy asphalt concrete scheme designed in the construction period, the direct engineering cost of the major repair engineering in the period is saved by more than 2 million yuan.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. The pavement structure of the steel bridge deck is characterized by comprising a first waterproof bonding layer, a modified epoxy asphalt gravel layer, a second waterproof bonding layer and an ultrahigh-performance structural layer which are sequentially paved on the surface of a steel plate of the steel bridge deck;
the first waterproof bonding layer is a modified epoxy resin layer;
the ultrahigh-performance structural layer is a pavement structural layer taking high-molecular polymer modified asphalt as a binder, or comprises a pavement structural layer taking high-molecular polymer modified asphalt as a binder and a third waterproof bonding layer;
the second waterproof bonding layer and the third waterproof bonding layer are layers formed by one material of epoxy emulsified asphalt, high polymer modified asphalt and high polymer modified emulsified asphalt.
2. Pavement structure for steel bridge decks according to claim 1, wherein said modified epoxy layer of said first waterproof bonding layer is applied in an amount of 0.4-0.6kg/m2。
3. The paving structure of a steel bridge deck according to claim 1, wherein the porosity of the modified epoxy asphalt macadam layer is 1-3%.
4. A pavement structure for steel bridge decks according to claim 1 or 3, wherein said modified epoxy asphalt macadam layer has a thickness of 0.5-2 cm.
5. The paving structure of the steel bridge deck according to claim 1, wherein the ultra-high performance structural layer is a pavement structural layer using high molecular polymer modified asphalt as a binder, the dynamic viscosity of the high molecular polymer modified asphalt at 60 ℃ is greater than 200000Pa.s, and the thickness of the ultra-high performance structural layer is 30-50 mm.
6. The paving structure of the steel bridge deck according to claim 1, wherein the ultra-high performance structural layer comprises a pavement structural layer and a third waterproof bonding layer, the pavement structural layer comprises a pavement structural layer with a thickness of 30-50mm and a third waterproof bonding layer, the pavement structural layer comprises a pavement structural layer with a thickness of 8-15mm, the pavement structural layer comprises a high polymer modified asphalt as a binder, and the dynamic viscosity of the high polymer modified asphalt is greater than 200000Pa.s at 60 ℃.
7. The paving structure of the steel deck according to claim 6, wherein the porosity of the pavement structure layer with the thickness of 8-15mm is 18-25%.
8. The paving structure of the steel bridge deck according to claim 1, wherein the ultra-high performance structural layer comprises a pavement structural layer and a third waterproof bonding layer, the pavement structural layer comprises a pavement structural layer with a thickness of 30-50mm and a third waterproof bonding layer, the pavement structural layer comprises a pavement structural layer with a thickness of 15-25mm, the pavement structural layer takes high polymer modified asphalt as a binder, and the dynamic viscosity of the high polymer modified asphalt is greater than 200000Pa.s at 60 ℃.
9. The paving structure of the steel deck according to any one of claims 1 or 5 to 8, wherein the thickness of the ultra-high performance structural layer is 3.8-5.5 cm.
10. The paving structure of the steel bridge deck according to claim 1, wherein the steel plate surface is shot blasted to a surface roughness of 2.0-3.0.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111705656A (en) * | 2020-07-03 | 2020-09-25 | 重庆市智翔铺道技术工程有限公司 | Steel bridge deck pavement layer |
| CN111705657A (en) * | 2020-07-03 | 2020-09-25 | 重庆市智翔铺道技术工程有限公司 | Steel bridge deck pavement structure for ultra-large span |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111705656A (en) * | 2020-07-03 | 2020-09-25 | 重庆市智翔铺道技术工程有限公司 | Steel bridge deck pavement layer |
| CN111705657A (en) * | 2020-07-03 | 2020-09-25 | 重庆市智翔铺道技术工程有限公司 | Steel bridge deck pavement structure for ultra-large span |
| CN111705656B (en) * | 2020-07-03 | 2022-06-10 | 重庆市智翔铺道技术工程有限公司 | Steel bridge deck pavement layer |
| CN111705657B (en) * | 2020-07-03 | 2022-06-10 | 重庆市智翔铺道技术工程有限公司 | Steel bridge deck pavement structure for ultra-large span |
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