A steel bridge deck asphalt pavement structure and its construction method

Abstract

This invention provides an asphalt pavement structure for steel bridge decks and its construction method, belonging to the field of road engineering technology. The pavement structure consists of a self-flowing adhesive insulation layer, a prefabricated load-bearing layer, and a multi-functional wear-resistant layer, arranged sequentially from the steel bridge deck upwards. An interface adhesive is applied between the bottom surface of the self-flowing adhesive insulation layer and the steel bridge deck. An aerogel nano-insulation layer is laid on top of the self-flowing adhesive insulation layer, or a layer of heat-insulating ceramic crushed particles is spread and laid. The prefabricated load-bearing layer and the multi-functional wear-resistant layer are then laid on top of the aerogel nano-insulation layer or the heat-insulating ceramic crushed particle layer. The prefabricated load-bearing layer is constructed using a prefabrication and assembly method. This invention ensures interlayer bonding between the asphalt pavement layer and the steel bridge deck, solves the problem of coordinated deformation between the asphalt pavement layer and the steel bridge deck, reduces the self-weight of the asphalt pavement layer, and simultaneously provides multiple functions such as rutting resistance, shoving resistance, anti-icing, skid resistance, and noise reduction, significantly improving durability and driving safety, and effectively protecting the steel bridge deck.

Description

Technical Field

[0001] This invention relates to the field of road engineering technology, specifically to a steel bridge deck asphalt pavement structure and its construction method. Background Technology

[0002] Currently, bridge construction has experienced unprecedented rapid development. Due to their lightweight nature, steel box girders are widely used in long-span bridges. The quality of steel bridge deck pavement and its compatibility with the steel bridge structure determine the pavement's durability, comfort, and safety. While asphalt pavement is conventionally used, it suffers from high weight, limited ability to deform in tandem with the steel bridge deck, and high temperature sensitivity compared to the high heat conductivity of steel structures. Under high-temperature, heavy-load conditions, asphalt pavement on steel bridge decks quickly develops cracks, shoving, rutting, and other defects, significantly reducing its service life. Furthermore, asphalt pavement construction is typically carried out on-site, subject to numerous limiting factors that can easily lead to unstable asphalt pavement quality. Therefore, there is an urgent need to develop a lightweight, highly deformable, easy-to-construct, safe, and durable asphalt pavement structure for steel bridge decks. Summary of the Invention

[0003] The technical objective of this invention is to overcome the shortcomings of the prior art and provide a steel bridge deck asphalt pavement structure and its construction method.

[0004] The technical solution of the present invention is implemented in the following manner: a steel bridge deck asphalt pavement structure of the present invention, wherein the pavement structure consists of a self-flowing adhesive heat insulation layer, a prefabricated load-bearing layer and a multi-functional wear-resistant layer, which are arranged sequentially from the steel bridge deck upwards.

[0005] An interface adhesive is applied between the bottom surface of the self-flowing bonded insulation layer and the steel bridge deck. An aerogel nano-insulation layer is laid on the top surface of the self-flowing bonded insulation layer, or a layer of broken ceramic insulation particles is spread and laid.

[0006] An assembled load-bearing layer and a multi-functional wear layer are laid on top of an aerogel nano-insulation layer or a layer of broken ceramic insulating particles.

[0007] The present invention discloses a construction method for an asphalt pavement structure for a steel bridge deck: the pavement structure of the steel bridge deck consists of a self-flowing adhesive heat insulation layer, a prefabricated load-bearing layer, and a multi-functional wear-resistant layer, arranged sequentially from the steel bridge deck upwards.

[0008] An interface adhesive is applied between the bottom surface of the self-flowing bonded insulation layer and the steel bridge deck. An aerogel nano-insulation layer is laid on the top surface of the self-flowing bonded insulation layer, or a layer of broken ceramic insulation particles is spread and laid.

[0009] An assembled load-bearing layer and a multi-functional wear-resistant layer are laid on top of an aerogel nano-insulation layer or a layer of broken ceramic insulating particles.

[0010] The thickness of the self-flowing adhesive insulation layer is 20mm; the thickness of the prefabricated load-bearing layer is 30-40mm; and the thickness of the multi-functional wear-resistant layer is 15-20mm.

[0011] in:

[0012] The prefabricated load-bearing layer adopts a prefabrication and assembly construction method. The assembly construction steps are as follows:

[0013] (1) The prefabricated load-bearing asphalt mixture is made into square precast blocks with a side length of 3-5m and a thickness of 30-40mm;

[0014] (2) During the assembly construction, a steel mesh with a length and width of 3m×3m~5m×5m is first welded on the steel bridge deck. The steel bars are threaded steel with a diameter of 10mm. The two ends of the steel mesh are welded to the steel guardrails on both sides of the steel bridge deck. The distance between the steel mesh and the top surface of the self-flowing adhesive insulation layer is 20mm.

[0015] (3) Install the precast blocks inside the mesh of the steel mesh, and then pour the grout sealant at the overlap between the precast blocks and the steel mesh;

[0016] (4) Install steel transverse drainage channels with a width and height of 10mm at the overlapping positions of the precast blocks along the cross section of the bridge deck.

[0017] (5) Install a steel longitudinal drainage channel with a width of 50mm and a height of 30mm along the low side edge of the bridge deck longitudinal section. The transverse drainage channel is connected to the longitudinal drainage channel.

[0018] The asphalt mixture of the self-flowing bonded insulation layer has a maximum nominal particle size of 4.75 mm, a penetration of 3.0 to 5.0 mm at 60°C, and a flowability of 15.0 to 35.0 s at 240°C.

[0019] The self-flowing bonded thermal insulation asphalt mixture is composed of low-grade composite modified asphalt, thermal insulation aggregate, and thermal insulation fiber.

[0020] According to the weight ratio, the self-flowing bonded heat insulation asphalt mixture contains 10-13 parts of low-grade composite modified asphalt, 25-35 parts of coarse aggregate, 35-45 parts of fine aggregate, 15-25 parts of mineral powder, and 0.3-0.5 parts of heat insulation fiber.

[0021] The low-grade composite modified asphalt is mixed in the following proportions by weight: 90-95 parts of No. 30 asphalt, 2-4 parts of SBS modifier, and 3-6 parts of natural asphalt.

[0022] The insulation layer material is composed of basalt coarse aggregate, basalt fine aggregate, and limestone mineral powder;

[0023] The insulation layer fiber is a polymer fiber;

[0024] The maximum nominal particle size of the asphalt mixture in the prefabricated load-bearing layer is 9.5 mm, the porosity is 3.0% to 4.0%, the aggregate gap ratio is 16.5% to 18.0%, and the asphalt saturation is 75.0% to 85.0%.

[0025] The prefabricated load-bearing asphalt mixture is composed of high-modulus composite modified asphalt, load-bearing aggregate, and load-bearing fiber.

[0026] According to the weight ratio, the prefabricated load-bearing asphalt mixture contains 6-8 parts of high-modulus composite modified asphalt, 60-76 parts of coarse aggregate, 10-20 parts of fine aggregate, 8-12 parts of mineral powder, and 0.5-0.8 parts of load-bearing fiber.

[0027] The high-modulus composite modified asphalt is mixed in the following proportions by weight: 85-91 parts of No. 70 asphalt, 3-5 parts of SBS modifier, and 6-10 parts of polyolefin additives.

[0028] The load-bearing layer material is composed of steel slag coarse aggregate, basalt or limestone fine aggregate, and limestone mineral powder;

[0029] The load-bearing layer fiber is steel fiber;

[0030] The maximum nominal particle size of the multi-functional wear-resistant asphalt mixture is 7.2 mm, and the porosity is 20.0% to 30.0%.

[0031] The multifunctional wear-resistant asphalt mixture is composed of high-viscosity modified asphalt, wear-resistant aggregate, wear-resistant fiber, and slow-release anti-icing agent.

[0032] According to the weight ratio, the multifunctional wear-resistant asphalt mixture contains 4-6 parts of high-viscosity modified asphalt, 75-87 parts of coarse aggregate, 5-10 parts of fine aggregate, 1-3 parts of hydrated lime powder, 0.2-0.4 parts of wear-resistant fiber, and 3-6 parts of slow-release anti-icing agent.

[0033] The high-viscosity modified asphalt is mixed in the following proportions by weight: 86-90 parts of No. 70 asphalt, 4-6 parts of SBS modifier, and 6-8 parts of high-viscosity additive.

[0034] The wear layer material is composed of steel slag coarse aggregate, limestone fine aggregate, and hydrated lime powder;

[0035] The wear layer fiber is polyester fiber.

[0036] The precast blocks and steel mesh of the prefabricated load-bearing layer constitute an interlocking structural layer with adhesive seal.

[0037] The application of a steel bridge deck asphalt pavement structure on a steel bridge deck.

[0038] The application of the construction method for asphalt pavement structure of steel bridge deck in road and bridge engineering construction.

[0039] The advantages of the steel bridge deck asphalt pavement structure and its construction method of the present invention compared with the prior art are as follows:

[0040] (I) Self-flowing adhesive insulation layer

[0041] The bottom of the self-flowing adhesive insulation layer is coated with an interface adhesive to ensure the adhesion between the asphalt pavement layer and the steel bridge deck, preventing water from entering the interlayer and corroding the steel bridge deck. A layer of aerogel nano-insulation material is laid on the top surface of the self-flowing adhesive insulation layer to reduce the heat transfer from the steel bridge deck to the asphalt pavement layer and reduce the damage to the asphalt pavement layer caused by high temperature factors. The self-flowing paving construction has the characteristics of no compaction, strong deformation capacity, good adhesion and heat insulation, giving the structural layer excellent density and flatness.

[0042] The aerogel nano-insulation material layer on top of the self-flowing bonded insulation layer can also be replaced with uniformly spread insulation ceramic crushed particles to reduce the heat transfer from the steel bridge deck to the asphalt pavement layer and reduce the damage to the asphalt pavement layer caused by high temperature factors. The insulation ceramic crushed particles are porous alumina ceramic particles with a crushed stone shape, which interlock with the self-flowing bonded insulation layer to prevent interlayer slippage of the bridge deck pavement.

[0043] (II) Prefabricated load-bearing floor

[0044] High-modulus modifiers are added to the asphalt mixture of the prefabricated load-bearing layer to optimize its gradation range and create an interlocking structure. Steel fibers or polyester fibers are also incorporated into the mixture, giving it excellent high and low temperature performance and water tightness. Furthermore, the prefabricated load-bearing layer utilizes a prefabricated construction method, ensuring quality control indicators such as the compaction degree of the asphalt pavement, significantly improving construction efficiency, and shortening the construction period. The prefabricated load-bearing layer employs a prefabrication and assembly construction method.

[0045] (III) Multifunctional Wear Layer

[0046] Multifunctional wearing courses offer advantages such as thinness, large surface texture, drainage and noise reduction, and snow and ice melting. They reduce the overall mass load of the asphalt pavement, thereby lowering the construction difficulty of ultra-long-span steel bridges. High-viscosity additives, slow-release anti-icing agents, and polyester fibers are added to the asphalt mixture of the multifunctional wearing course, ensuring the basic properties of the surface wearing course, such as safety and durability, while achieving non-slip properties in rainy weather, non-icing properties in winter, durable maintenance of surface anti-skid performance, and reduced traffic noise on the bridge surface.

[0047] Compared with existing technologies, the asphalt pavement structure in this invention can deform synchronously with the steel bridge deck, greatly improving its resistance to rutting and shoving at high temperatures.

[0048] This invention discloses an asphalt pavement structure for steel bridge decks and its construction method, which ensures interlayer bonding between the asphalt pavement layer and the steel bridge deck, solves the problem of coordinated deformation between the asphalt pavement layer and the steel bridge deck, reduces the self-weight of the asphalt pavement layer, and at the same time has multiple functions such as anti-rutting, anti-shoving, anti-icing, anti-skid and noise reduction, which greatly improves the durability and driving safety of the asphalt pavement structure, effectively protects the steel bridge deck, and can be widely used in asphalt pavement of steel bridge decks.

[0049] The steel bridge deck asphalt pavement structure and its construction method of the present invention are reasonably designed, simple in structure, safe and reliable, convenient to construct and easy to maintain, and have great value for promotion and use. Attached Figure Description

[0050] Appendix Figure 1 This is a structural schematic diagram of Embodiment 1 of the present invention;

[0051] Appendix Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0052] Appendix Figure 3 This is a top view schematic diagram of the prefabricated load-bearing layer layout structure of the present invention;

[0053] Appendix Figure 4 This is a schematic diagram of the three-dimensional layout structure of the prefabricated load-bearing layer of the present invention;

[0054] Appendix Figure 5 This is a three-dimensional structural diagram of the prefabricated load-bearing layer of the present invention;

[0055] Appendix Figure 6 This is a schematic diagram of the joint cross-sectional structure of the prefabricated load-bearing layer of the present invention.

[0056] The markings in the attached diagram represent:

[0057] 1. Multifunctional wear-resistant layer; 2. Prefabricated load-bearing layer; 3. Aerogel nano-insulation layer; 4. Self-flowing adhesive insulation layer; 5. Adhesive layer; 6. Steel bridge deck;

[0058] 7. Insulating ceramic crushed particle layer,

[0059] 8. Precast blocks, 9. Reinforcing mesh, 10. Threaded steel bars, 11. Overlap joints, 12. Sealing compound.

[0060] 13. Horizontal drainage channel; 14. Horizontal drainage channel cover; 15. Water permeable hole; 16. Vertical drainage channel.

[0061] The following detailed description, in conjunction with the accompanying drawings, describes a steel bridge deck asphalt pavement structure and its construction method according to the present invention.

[0062] Example 1:

[0063] As attached Figure 1 As shown, before the asphalt paving of the steel bridge deck is carried out, the steel bridge deck needs to be derusted and then coated with an interface adhesive.

[0064] Further construction of a self-flowing adhesive insulation layer with a thickness of 20mm is carried out.

[0065] The self-flowing bonded thermal insulation asphalt mixture contains 12 parts low-grade composite modified asphalt, 27.5 parts coarse aggregate, 40 parts fine aggregate, 20 parts mineral powder, and 0.5 parts fiber. Testing showed that the penetration of the self-flowing bonded thermal insulation asphalt mixture was 4.2 mm, and its flowability at 240℃ was 27.8 s.

[0066] A layer of aerogel nano-insulation material is further laid on top of the self-flowing adhesive insulation layer.

[0067] Further construction of the prefabricated load-bearing layer, with a construction thickness of 40mm, using high-modulus asphalt mixture precast slabs, which are precast from high-modulus asphalt mixture composed of high-modulus composite modified asphalt, mineral aggregates and fibers.

[0068] The mix proportions of high modulus asphalt mixtures are shown in Table 1, where comparative example one uses conventional SBS modified asphalt.

[0069] Table 1. Mixing proportions of high modulus asphalt mixtures

[0070]

[0071] The tests were conducted using Marshall volume index and road performance tests, and the results are shown in Table 2.

[0072] Table 2 Test Results

[0073]

[0074] As can be seen from the experimental results in Table 2:

[0075] The Marshall volume index void ratio, aggregate void ratio, and asphalt saturation test results of Example 1 and Comparative Example 1 are not significantly different and all meet the relevant design requirements. However, the dynamic stability, freeze-thaw splitting strength ratio, and low-temperature flexural failure strain are significantly different, indicating that high-modulus composite modified asphalt can significantly improve the high and low temperature performance and water stability of asphalt mixtures.

[0076] The assembly of precast asphalt mixture slabs for prefabricated load-bearing layers using the material proportions of Example 1 includes the following steps:

[0077] (1) The load-bearing asphalt mixture is made into square precast blocks with a side length of 3-5m and a thickness of 30-40mm;

[0078] (2) During the assembly construction, first weld a 3m×3m~5m×5m steel mesh on the steel bridge deck. The steel bars are threaded steel bars with a diameter of 10mm. The two ends of the steel mesh are welded to the steel guardrails on both sides as one piece. The distance between the steel mesh and the top surface of the self-flowing adhesive insulation layer is 20mm.

[0079] (3) Install the precast blocks inside the steel mesh, and then pour the sealant into the lap joint at the lap position;

[0080] (4) Install steel transverse drainage channels 13 with a width and height of 10mm at the overlapping positions of the precast blocks along the cross section of the bridge deck.

[0081] A transverse drainage trough cover 14 is fastened to the transverse drainage trough 13, and water-permeable holes 15 are opened at equal intervals on the transverse drainage trough cover 14.

[0082] (5) Install a steel longitudinal drainage channel 16 with a width of 50mm and a height of 30mm on the lower side edge along the longitudinal section of the bridge deck, and the transverse drainage channel 13 is connected to the longitudinal drainage channel 16.

[0083] Water seeping from the multi-functional wear layer on the upper layer of the prefabricated load-bearing layer enters the transverse drainage channel 13 through the permeable hole 15. Following the side slope tendency of each layer or the steel bridge deck, the seeping water flows from each confluence into the transverse drainage channel 13 and into the longitudinal drainage channel 16 at the low edge of the steel bridge deck for collection and drainage out of the bridge deck.

[0084] Further apply a multi-functional wear-resistant layer with a thickness of 20mm.

[0085] The multifunctional wear-resistant asphalt mixture contains 5 parts high-viscosity modified asphalt, 80 parts steel slag coarse aggregate, 8 parts limestone fine aggregate, 2 parts hydrated lime powder, 0.3 parts polyester fiber, and 4.3 parts slow-release anti-icing agent.

[0086] Example 2:

[0087] From the steel bridge deck upwards, the layers are arranged in sequence: a self-flowing adhesive insulation layer, a prefabricated load-bearing layer, and a multi-functional wear-resistant layer.

[0088] Example 2 is basically similar to Example 1, but the difference is:

[0089] Before asphalt paving is carried out on the steel bridge deck, the steel bridge deck needs to be derusted. Then, an interface adhesive is applied to the steel bridge deck, and a self-flowing adhesive insulation layer is laid on top. Insulating ceramic crushed particles are then evenly sprinkled on the self-flowing adhesive insulation layer.

[0090] An assembled load-bearing layer and a multi-functional wear layer are laid on top of the thermal insulation ceramic crushed particle layer.

[0091] The embodiments described above are merely preferred embodiments of the present invention. Ordinary variations and substitutions made by those skilled in the art within the scope of the technical solutions of the present invention should be included in the protection of the present invention.

Claims

1. A steel bridge deck asphalt pavement structure characterized in that The paving structure is sequentially from the steel bridge deck upwards the self-flowing type bonding heat insulation layer, the assembled load bearing layer and the multi-functional wearing layer; The interface bonding agent is brushed between the bottom surface of the self-flowing type bonding heat insulation layer and the steel bridge deck, and a layer of aerogel nano heat insulation layer or heat insulation ceramic broken particle layer is laid on the top surface of the self-flowing type bonding heat insulation layer; The assembled load bearing layer and the multi-functional wearing layer are laid on the aerogel nano heat insulation layer or the heat insulation ceramic broken particle layer; The paving thickness of the self-flowing type bonding heat insulation layer is 20mm; the paving thickness of the assembled load bearing layer is 30-40mm; and the paving thickness of the multi-functional wearing layer is 15-20mm; The paving of the assembled load bearing layer adopts the method of prefabrication and post assembly, and the assembly construction steps are as follows: (1) The asphalt mixture of the assembled load bearing layer is made into square prefabricated blocks with the side length of 3-5m and the thickness of 30-40mm; (2) The steel mesh with the length and width of 3m x 3m-5m x 5m is welded on the steel bridge deck in the assembly construction, the steel is the threaded steel with the diameter of 10mm, the two ends of the steel mesh are welded with the steel guardrails on the two sides of the steel bridge deck as a whole, and the distance between the steel mesh and the top surface of the self-flowing type bonding heat insulation layer is 20mm; (3) The prefabricated blocks are installed in the grid inside the steel mesh, and then the pouring sealant is poured and sealed at the overlapping position of the prefabricated blocks and the steel mesh; (4) The steel transverse drainage groove with the width and height of 10mm is installed at the overlapping position of the prefabricated blocks along the bridge deck cross section direction; (5) The steel longitudinal drainage groove with the width of 50mm and the height of 30mm is installed at the low side edge along the bridge deck longitudinal section direction, and the transverse drainage groove is communicated with the longitudinal drainage groove.

2. The steel bridge deck asphalt paving structure according to claim 1, characterized in that: The paving thickness of the self-flowing type bonding heat insulation layer is 20mm; The maximum nominal particle size of the asphalt mixture of the self-flowing type bonding heat insulation layer is 4.75mm, the penetration at 60℃ is 3.0-5.0mm, and the flow degree at 240℃ is 15.0-35.0s; The asphalt mixture of the self-flowing type bonding heat insulation layer is composed of low-grade composite modified asphalt, heat insulation layer aggregate and heat insulation layer fiber; According to the weight ratio, the low-grade composite modified asphalt in the asphalt mixture of the self-flowing type bonding heat insulation layer is 10-13 parts, the coarse aggregate is 25-35 parts, the fine aggregate is 35-45 parts, the mineral powder is 15-25 parts, and the heat insulation layer fiber is 0.3-0.5 parts; The component mixture ratio of the low-grade composite modified asphalt is composed of 30# asphalt 90-95 parts, SBS modifier 2-4 parts, and natural asphalt 3-6 parts; The heat insulation layer aggregate is composed of basalt coarse aggregate, basalt fine aggregate and limestone mineral powder; The heat insulation layer fiber is polymer fiber.

3. The steel bridge deck asphalt paving structure according to claim 1, characterized in that: The paving thickness of the assembled load bearing layer is 30-40mm; The maximum nominal particle size of the asphalt mixture of the assembled load bearing layer is 9.5mm, the void ratio is 3.0%-4.0%, the mineral aggregate void ratio is 16.5%-18.0%, and the asphalt saturation is 75.0%-85.0%. The assembled load-bearing layer asphalt mixture is composed of high modulus composite modified asphalt, load-bearing layer mineral aggregate and load-bearing layer fiber; According to the weight ratio, the high modulus composite modified asphalt in the assembled load-bearing layer asphalt mixture is 6-8 parts, the coarse aggregate is 60-76 parts, the fine aggregate is 10-20 parts, the mineral powder is 8-12 parts, and the load-bearing layer fiber is 0.5-0.8 parts; The component mixture ratio of the high modulus composite modified asphalt is 70# asphalt 85-91 parts, SBS modifier 3-5 parts, and polyolefin additive 6-10 parts by weight; The load-bearing layer mineral aggregate is composed of steel slag coarse aggregate, basalt or limestone fine aggregate, and limestone mineral powder; The load-bearing layer fiber is steel fiber.

4. The steel bridge deck asphalt pavement structure according to claim 1, characterized in that: The pavement thickness of the multifunctional wearing course is 15-20 mm; The maximum nominal particle size of the multifunctional wearing course asphalt mixture is 7.2 mm, and the void ratio is 20.0%-30.0%; The multifunctional wearing course asphalt mixture is composed of high viscosity modified asphalt, wearing course mineral aggregate, wearing course fiber and slow-release anti-icing agent; According to the weight ratio, the high viscosity modified asphalt in the multifunctional wearing course asphalt mixture is 4-6 parts, the coarse aggregate is 75-87 parts, the fine aggregate is 5-10 parts, the lime powder is 1-3 parts, the wearing course fiber is 0.2-0.4 parts, and the slow-release anti-icing agent is 3-6 parts; The component mixture ratio of the high viscosity modified asphalt is 70# asphalt 86-90 parts, SBS modifier 4-6 parts, and high viscosity additive 6-8 parts by weight; The wearing course mineral aggregate is composed of steel slag coarse aggregate, limestone fine aggregate and lime powder; The wearing course fiber is polyester fiber.

5. A method of constructing a steel bridge deck asphalt pavement structure, characterized by: The pavement structure of the steel bridge deck is sequentially from the steel bridge deck upwardly the self-flowing bonding and heat insulation layer, the assembled load-bearing layer and the multifunctional wearing course; The interface bonding agent is brushed between the bottom surface of the self-flowing bonding and heat insulation layer and the steel bridge deck, and a layer of aerogel nano heat insulation layer or a layer of heat insulation ceramic broken particle layer is laid on the top surface of the self-flowing bonding and heat insulation layer; The assembled load-bearing layer and the multifunctional wearing course are laid on the aerogel nano heat insulation layer or the heat insulation ceramic broken particle layer; The pavement thickness of the self-flowing bonding and heat insulation layer is 20 mm, the pavement thickness of the assembled load-bearing layer is 30-40 mm, and the pavement thickness of the multifunctional wearing course is 15-20 mm; The assembled load-bearing layer adopts the method of prefabrication and post assembly, and the steps of the assembled construction are as follows: (1) The assembled load-bearing layer asphalt mixture is made into square prefabricated blocks with a side length of 3-5 m and a thickness of 30-40 mm; (2) During the assembly construction, the steel mesh with a grid length and width of 3 m x 3 m-5 m x 5 m is welded on the steel bridge deck, the steel bar is a threaded steel bar with a diameter of 10 mm, the two ends of the steel mesh are welded with the steel guardrails on both sides of the steel bridge deck as a whole, and the spacing between the steel mesh and the top surface of the self-flowing bonding and heat insulation layer is 20 mm; (3) The prefabricated blocks are installed inside the grid of the steel mesh, and then the pouring sealant is poured and sealed at the overlapping position of the prefabricated blocks and the steel mesh. ​ (4) A steel transverse drainage groove with a width of 10 mm and a height of 10 mm is installed at the joint position of the prefabricated blocks in the transverse direction of the bridge deck cross section; (5) A steel longitudinal drainage groove with a width of 50 mm and a height of 30 mm is installed at the low side edge in the longitudinal direction of the bridge deck cross section, and the transverse drainage groove is communicated with the longitudinal drainage groove.

6. The construction method of a steel bridge deck asphalt pavement structure according to claim 5, characterized in that: the maximum nominal particle size of the asphalt mixture of the self-flowing bonding thermal insulation layer is 4.75 mm, the penetration at 60°C is 3.0-5.0 mm, and the flow degree at 240°C is 15.0-35.0 s; the asphalt mixture of the self-flowing bonding thermal insulation layer is composed of low-grade composite modified asphalt, thermal insulation layer mineral aggregate, and thermal insulation layer fiber; according to the weight ratio, the low-grade composite modified asphalt in the asphalt mixture of the self-flowing bonding thermal insulation layer is 10-13 parts, the coarse aggregate is 25-35 parts, the fine aggregate is 35-45 parts, the mineral powder is 15-25 parts, and the thermal insulation layer fiber is 0.3-0.5 parts; wherein the component mixture of the low-grade composite modified asphalt is composed of 30# asphalt 90-95 parts, SBS modifier 2-4 parts, and natural asphalt 3-6 parts by weight; the thermal insulation layer mineral aggregate is composed of basalt coarse aggregate, basalt fine aggregate, and limestone mineral powder; the thermal insulation layer fiber is a polymer fiber; the maximum nominal particle size of the asphalt mixture of the prefabricated load-bearing layer is 9.5 mm, the void ratio is 3.0%-4.0%, the mineral aggregate void ratio is 16.5%-18.0%, and the asphalt saturation is 75.0%-85.0%; the asphalt mixture of the prefabricated load-bearing layer is composed of high-modulus composite modified asphalt, load-bearing layer mineral aggregate, and load-bearing layer fiber; according to the weight ratio, the high-modulus composite modified asphalt in the asphalt mixture of the prefabricated load-bearing layer is 6-8 parts, the coarse aggregate is 60-76 parts, the fine aggregate is 10-20 parts, the mineral powder is 8-12 parts, and the load-bearing layer fiber is 0.5-0.8 parts; wherein the component mixture of the high-modulus composite modified asphalt is composed of 70# asphalt 85-91 parts, SBS modifier 3-5 parts, and polyolefin additive 6-10 parts by weight; the load-bearing layer mineral aggregate is composed of steel slag coarse aggregate, basalt or limestone fine aggregate, and limestone mineral powder; the load-bearing layer fiber is a steel fiber; the maximum nominal particle size of the multifunctional wearing layer asphalt mixture is 7.2 mm, and the void ratio is 20.0%-30.0%; the multifunctional wearing layer asphalt mixture is composed of high-viscosity modified asphalt, wearing layer mineral aggregate, wearing layer fiber, and slow-release anti-icing agent; according to the weight ratio, the high-viscosity modified asphalt in the multifunctional wearing layer asphalt mixture is 4-6 parts, the coarse aggregate is 75-87 parts, the fine aggregate is 5-10 parts, the slaked lime powder is 1-3 parts, the wearing layer fiber is 0.2-0.4 parts, and the slow-release anti-icing agent is 3-6 parts; wherein the component mixture of the high-viscosity modified asphalt is composed of 70# asphalt 86-90 parts, SBS modifier 4-6 parts, and high-viscosity additive 6-8 parts by weight. The wearing layer mineral aggregate is composed of steel slag coarse aggregate, limestone fine aggregate and slaked lime powder. The wearing layer fiber is polyester fiber.

7. A method of constructing a steel bridge deck asphalt pavement structure as defined in claim 5, wherein: The prefabricated block and the steel bar net of the assembled load-bearing layer form a glued and embedded extruded structure layer.

8. The use of the steel bridge deck asphalt pavement structure according to any one of claims 1 to 4 on a steel bridge deck.

9. The use of the construction method of the steel bridge deck asphalt pavement structure according to any one of claims 5 to 7 in road and bridge engineering construction.

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