Steel bridge deck pavement structure suitable for heavy traffic and pavement method thereof

Abstract

The invention discloses a steel bridge deck pavement structure suitable for heavy traffic and a pavement method thereof, and belongs to the field of steel bridge deck pavement. Comprising an anti-corrosion layer, a high-performance stress dispersion layer, a waterproof bonding stress absorption layer and a modified asphalt concrete wearing layer which are sequentially laid on the upper surface of a steel bridge deck slab. Therefore, the comprehensive performance of impact resistance, deformation resistance, aging resistance and the like of the whole pavement structure reaches a relatively high level. By arranging the high-performance stress dispersion layer, the pressure of vehicle loads on the steel bridge deck is dispersed, local stress concentration caused by the wheel load effect is greatly reduced, and the fatigue cracking problem of the orthotropic bridge deck is relieved; by arranging the waterproof bonding stress absorption layer, the interface bonding strength and shear strength between the high-performance stress dispersion layer and the modified asphalt concrete wearing layer are enhanced, lower cracks can be prevented from being reflected to the modified asphalt concrete wearing layer, and the service life of the steel bridge under heavy traffic is prolonged.

Description

Technical Field

[0001] The present invention belongs to the technical field of steel bridge deck pavement, and in particular relates to a steel bridge deck pavement structure suitable for heavy-load traffic and a paving method thereof. Background Art

[0002] At present, domestic steel box girder bridge decks generally adopt orthotropic plate structure. However, due to the high flexibility, complex structure, difficulty in welding quality control, and large welding residual stress of orthotropic steel bridge decks, under the repeated action of heavy vehicle loads, the steel bridge deck will have stress concentration problems and easily produce fatigue cracks. At present, the research on fatigue cracking of orthotropic steel bridge decks mainly focuses on the relationship between its own structural details and fatigue behavior, while ignoring the combined effect of bridge deck pavement and steel bridge deck, as well as the influence of pavement material properties on steel plate fatigue behavior. Summary of the invention

[0003] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a steel bridge deck paving structure suitable for heavy-load traffic, which combines and lays multiple functional layers with different performances to solve the problem of stress concentration in the steel bridge deck under heavy vehicle loads.

[0004] The technical solution adopted by the invention is: a steel bridge deck pavement structure suitable for heavy-load traffic. The technical key points are: it includes a steel bridge deck, an anti-corrosion layer, a high-performance stress dispersion layer, a waterproof adhesive stress absorption layer and a modified asphalt concrete wear layer. The anti-corrosion layer is coated on the steel bridge deck, and a high-performance stress dispersion layer is laid above the anti-corrosion layer. A waterproof adhesive stress absorption layer is laid above the high-performance stress dispersion layer, and a modified asphalt concrete wear layer is laid above the waterproof adhesive stress absorption layer.

[0005] Furthermore, the high-performance stress dispersion layer is an integrated structural layer formed by pouring and curing ultra-high performance concrete on top of the stress dispersion grid plate and the steel bridge deck.

[0006] Furthermore, the high-performance stress dispersion grid plate includes: a grid plate, a stress groove, a square hole mesh and a pin hole; a stress groove is opened in the middle of the grid plate, the stress groove is divided into a longitudinal groove and a transverse groove, and the longitudinal groove and the transverse groove intersect to form a plurality of square hole meshes, and a pin hole is provided at the junction of the longitudinal groove and the transverse groove of the stress groove.

[0007] Furthermore, pins are welded on the steel bridge deck, which are evenly arranged and correspond one-to-one with the pin holes of the stress dispersion grid plate.

[0008] Furthermore, the waterproof bonding stress absorption layer is formed by hot spreading crushed stones on the high-viscosity and high-elasticity modified asphalt, and then rolling the crushed stones so that the crushed stones are completely embedded in the asphalt to form a structural layer of asphalt wrapped crushed stones. The amount of the high-viscosity and high-elasticity modified asphalt is 2.2-2.5 kg / m2 The amount of crushed stone spread is 14-16 kg / m 2 , particle size is 9.5~13.2mm.

[0009] Furthermore, the high-viscosity and high-elasticity modified asphalt wraps the gravel.

[0010] Furthermore, the anti-corrosion layer is epoxy zinc-rich paint with a thickness of 0.5 to 1 mm.

[0011] Furthermore, the thickness of the modified asphalt concrete wearing layer is 5 to 10 cm.

[0012] A method for paving a steel bridge deck suitable for heavy-load traffic is provided, wherein the steel bridge deck paving structure suitable for heavy-load traffic is paved, and the technical key points thereof are mainly the following steps:

[0013] S1. Welding pins on steel bridge deck;

[0014] S2. Sandblasting and rust removal: First, pre-cleaning is performed, and dust and oil pollution are removed by using a high-pressure water gun and a cleaning agent. After the steel bridge deck is dry, sandblasting and rust removal are performed. The cleanliness must reach at least Sa2.5 level, and the roughness must reach at least 50-110μm;

[0015] S3. Anti-corrosion coating: Within 4 hours after sandblasting and rust removal, use a manual roller to apply epoxy zinc-rich paint at a dosage of 150-200g / m 2 ;

[0016] S4. Pavement of high-performance stress dispersion layer: transport the stress dispersion grid plate to the steel bridge deck, align the pin holes and the welded pins to ensure that the stress dispersion grid plate is firmly connected to the steel bridge deck, and then evenly pave the ultra-high performance concrete mixture on the steel bridge deck, and vibrate and compact it to ensure that the concrete is dense;

[0017] S5. Pavement of waterproof bonding stress absorption layer: Before paving, the high-performance stress dispersion layer must be flat, clean and dry, and the waterproof bonding stress absorption layer must be spread. The amount of high-viscosity and high-elastic modified asphalt spread should be controlled at 2.2-2.5 kg / m 2 The amount of crushed stone paving should be controlled at 14-16 kg / m 2 , spread the gravel and then roll it, roll it 2 to 3 times.

[0018] S6. Pave the modified asphalt concrete wear layer: After the waterproof bonding stress absorption layer is constructed, pave the modified asphalt concrete wear layer. The paving thickness is controlled at 5 to 10 cm and compact it after paving. During the paving and compaction process, keep the weather dry.

[0019] The beneficial effects of the present invention are as follows: the present invention provides a steel bridge deck pavement structure suitable for heavy-load traffic, comprising an anti-corrosion layer, a high-performance stress dispersion layer, a waterproof bonding stress absorption layer and a modified asphalt concrete wear layer sequentially laid on the upper surface of the steel bridge deck, by laying a plurality of functional layers with different performances in combination, making full use of the excellent characteristics of each functional layer, and carrying out reasonable layered and combined paving, so that the comprehensive performance of the entire pavement structure such as impact resistance, deformation resistance, and aging resistance reaches a higher level.

[0020] The high-performance stress dispersion layer of the present invention forms a steel-concrete composite structure through a stress dispersion grid plate and ultra-high performance concrete and a steel bridge deck, so that the concrete and the steel beam are stressed together, the lateral stiffness of the bridge deck is improved, and the local stress concentration caused by the wheel load can be greatly reduced, and the fatigue cracking problem of the orthotropic bridge deck can be alleviated. At the same time, the high performance and high durability of the ultra-high performance concrete can reduce the diseases of the bridge deck concrete in the later stage.

[0021] The waterproof adhesive stress absorbing layer of the present invention can be added during the construction of a steel box girder bridge to enhance the bonding and shear strength between the high-performance stress dispersion layer and the modified asphalt concrete wear layer, and coordinate interlayer deformation; improve the waterproof performance of the high-performance stress dispersion layer, and prevent water and deicing salt from penetrating and causing corrosion of the steel plate; absorb and dissipate the energy generated by stress concentration at the expansion (crack) joints of the high-performance stress dispersion layer, prevent the cracks from reflecting to the modified asphalt concrete wear layer, and improve the durability of the steel bridge deck pavement layer.

[0022] Compared with other asphalt pavements, the modified asphalt concrete wearing layer of the present invention has better elasticity, low-temperature and high-temperature performance, and flexural resistance, etc., and can significantly reduce common asphalt pavement diseases such as rutting, cracks, and bulges during operation, thereby improving driving comfort and service life.

[0023] By adopting the above technical solutions, steel bridges can better adapt to heavy-load traffic environments, reduce maintenance costs, and extend the service life of bridges. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 Schematic diagram of the steel bridge deck pavement structure under heavy traffic in an embodiment of the present invention;

[0026] Figure 2 A cross-sectional view of a pavement layer in an embodiment of the present invention;

[0027] Figure 3 Schematic diagram of a stress dispersion grid plate in an embodiment of the present invention; Figure 4 A schematic diagram of a stress dispersion grid plate in an embodiment of the invention;

[0028] The serial numbers in the figure are explained as follows: 1-steel bridge deck, 11-pin; 2-anti-corrosion layer; 3-high-performance stress dispersion layer, 31-stress dispersion grid plate, 311-grid plate, 312-stress groove, 313-square hole mesh, 314-pin hole, 32-ultra-high performance concrete; 4-waterproof bonding stress absorption layer; 5-modified asphalt concrete wear layer. DETAILED DESCRIPTION

[0029] To make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the following is a brief description of the present invention in conjunction with the attached Figure 1-Figure 3 The present invention is further described in detail with reference to the accompanying drawings and specific embodiments.

[0030] A steel bridge deck pavement structure suitable for heavy-load traffic in this embodiment includes a steel bridge deck 1, an anti-corrosion layer 2, a high-performance stress dispersion layer 3, a waterproof adhesive stress absorption layer 4 and a modified asphalt concrete wear layer 5. The anti-corrosion layer 2 is coated on the steel bridge deck 1, and a high-performance stress dispersion layer 3 is laid above the anti-corrosion layer 2, a waterproof adhesive stress absorption layer 4 is laid above the high-performance stress dispersion layer 3, and a modified asphalt concrete wear layer 5 is laid above the waterproof adhesive stress absorption layer 4.

[0031] In this embodiment, pins 11 are welded on the steel bridge deck 1 , and the pins 11 are evenly arranged and correspond one-to-one with the pin holes 314 of the stress dispersion grid plate 31 .

[0032] The high-performance stress dispersion layer 3 is a structural layer formed by pouring and curing ultra-high-performance concrete 32 on the stress dispersion grid plate 31 and the steel bridge deck 1 to form an integrated structure. The stress dispersion grid plate 31 of this embodiment is made of glass fiber as a reinforcing material and synthetic resin as a binder, wherein the glass fiber accounts for 30%-60% of the total mass of the composite material, and the synthetic resin accounts for 40%-70% of the total mass of the composite material. The specific structure of the stress dispersion grid plate 31 includes: a grid plate 311, a stress groove 312, a square hole mesh 313 and a pin hole 314, wherein the width of the grid plate 311 ranges from 10 to 15 cm, and the height ranges from 10 to 15 cm. A stress groove 312 is provided in the middle of the grid plate 311. When a heavy vehicle passes by the bridge deck, the poured concrete is subjected to downward pressure, and at this time the downward pressure is released to both sides in the stress groove 312, thereby playing a buffering role. The stress groove 312 of this embodiment includes a transverse groove and a longitudinal groove. A pin hole 314 is provided at the junction of the transverse groove and the longitudinal groove of the stress groove 312. The pin hole 314 is used to be fixedly connected with the pin 11 welded on the steel bridge deck 1. The transverse groove and the longitudinal groove divide the mesh plate 311 into a plurality of square meshes 313. The square meshes 313 disperse the impact stress and high vibration stress in the rolling area to the non-rolling area, thereby greatly eliminating the local deformation of the steel bridge deck caused by stress concentration. The thickness of the square mesh 313 of this embodiment is 1 / 3 of the thickness of the mesh plate 311.

[0033] The waterproof bonding stress absorbing layer 4 of this embodiment is made by hot-spreading crushed stones on the high-viscosity and high-elasticity modified asphalt, and then rolling the crushed stones so that the crushed stones are completely embedded in the asphalt to form a structural layer in which the crushed stones are wrapped by the asphalt. The high-viscosity and high-elasticity modified asphalt is the best to wrap the stones. The high-viscosity and high-elasticity modified asphalt is based on the matrix asphalt, and is mixed with the SBS modified main agent, compatibilizer, stabilizer, plasticizer, and viscosity-increasing component after high-temperature shearing and swelling development. The modified main agent is mixed in an amount of 3%-8%, the compatibilizer is mixed in an amount of 1%-3%, the stabilizer is mixed in an amount of 0.1%-0.5%, the plasticizer component is mixed in an amount of 1%-5%, and the viscosity-increasing component is mixed in an amount of 1%-5%.

[0034] In this embodiment, the amount of high-viscosity and high-elastic modified asphalt is 2.2-2.5 kg / m 2 , the amount of crushed stone spread is 14-16kg / m 2 The particle size is 9.5-13.2 mm. The thickness of the modified asphalt concrete wearing layer 5 is 5-10 cm, and SBS modified asphalt concrete or SMA modified asphalt concrete can be selected according to the actual construction conditions.

[0035] The anti-corrosion layer 2 of this embodiment is epoxy zinc-rich paint with a thickness of 0.5 to 1 mm.

[0036] The paving method of the steel bridge deck pavement structure suitable for heavy-load traffic adopted in this embodiment mainly includes the following steps:

[0037] S1, welding pins 11 on the steel bridge deck 1;

[0038] S2. Sandblasting and rust removal: First, pre-cleaning is performed, and dust, oil and other pollution are removed by using a high-pressure water gun and a cleaning agent. After the steel bridge deck is dry, a dust-free automatic sandblasting machine is used for sandblasting and rust removal. The cleanliness level must reach Sa2.5 and the roughness must reach 50-110μm.

[0039] S3, coating anti-corrosion layer 2: use manual roller to apply epoxy zinc-rich paint, the amount is 150-200g / m 2 This process should be completed within 4 hours after sandblasting and rust removal.

[0040] S4. Pave the high-performance stress dispersion layer 3: Use a crane to transport the stress dispersion grid plate 31 to the steel bridge deck 1, align the pin holes 314 and the welded pins 11 to ensure that the stress dispersion grid plate 31 is firmly connected to the steel bridge deck 1, and then evenly pave the ultra-high performance concrete mixture on the steel bridge deck 1, and use tools such as flat vibrators and vibrating rods to vibrate and compact to ensure that the concrete is dense.

[0041] S5. Pavement of waterproof bonding stress absorption layer: Before paving, the high-performance stress dispersion layer must be flat, clean and dry. Use an asphalt gravel synchronous sealing vehicle to spread the waterproof bonding stress absorption layer. The amount of high-viscosity and high-elastic modified asphalt spread should be controlled at 2.2-2.5 kg / m 2 The amount of crushed stone paving should be controlled at 14-16 kg / m 2 After spreading the gravel, use a rubber-wheel roller to compact it 2 to 3 times.

[0042] S6. Paving modified asphalt concrete wear layer 5: After the waterproof bonding stress absorption layer 4 is constructed, the modified asphalt concrete wear layer can be paved. The paving thickness is controlled at 5 to 10 cm and compacted after paving. During the paving and compaction process, the weather must be kept rainless.

[0043] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A steel bridge deck pavement structure suitable for heavy traffic, characterized in that: It includes a steel bridge deck, an anti-corrosion layer, a high-performance stress dispersion layer, a waterproof adhesive stress absorption layer and a modified asphalt concrete wear layer. The anti-corrosion layer is coated on the steel bridge deck, a high-performance stress dispersion layer is laid above the anti-corrosion layer, a waterproof adhesive stress absorption layer is laid above the high-performance stress dispersion layer, and a modified asphalt concrete wear layer is laid above the waterproof adhesive stress absorption layer.

2. A steel bridge deck pavement structure suitable for heavy traffic as claimed in claim 1, characterized in that: The high-performance stress dispersion layer is an integrated structural layer formed by pouring and curing ultra-high performance concrete on the stress dispersion grid plate and the steel bridge deck.

3. A steel bridge deck pavement structure suitable for heavy-load traffic as claimed in claim 2, characterized in that: The high-performance stress dispersion grid plate comprises: a grid plate, a stress groove, a square hole mesh and a pin hole; a stress groove is opened in the middle of the grid plate, the stress groove is divided into a longitudinal groove and a transverse groove, and the longitudinal groove and the transverse groove intersect to form a plurality of square hole meshes, and a pin hole is provided at the junction of the longitudinal groove and the transverse groove of the stress groove.

4. A steel bridge deck pavement structure suitable for heavy-load traffic as claimed in claim 3, characterized in that: Pins are welded on the steel bridge deck and are evenly arranged and correspond one-to-one to the pin holes of the stress dispersion grid plate.

5. A steel bridge deck pavement structure suitable for heavy-load traffic as claimed in claim 1, characterized in that: The waterproof bonding stress absorption layer is formed by hot spreading crushed stones on the high-viscosity and high-elasticity modified asphalt, and then rolling the crushed stones so that the crushed stones are completely embedded in the asphalt to form a structural layer of asphalt wrapped crushed stones. The amount of the high-viscosity and high-elasticity modified asphalt is 2.2-2.5 kg / m 2 The amount of crushed stone spread is 14-16 kg / m 2 , particle size is 9.5~13.2mm.

6. A steel bridge deck pavement structure suitable for heavy traffic as claimed in claim 5, characterized in that: The high-viscosity and high-elasticity modified asphalt wraps the crushed stones.

7. A steel bridge deck pavement structure suitable for heavy traffic as claimed in claim 1, characterized in that: The anti-corrosion layer is epoxy zinc-rich paint with a thickness of 0.5 to 1 mm.

8. The steel bridge deck pavement structure suitable for heavy-load traffic as claimed in claim 1, characterized in that: The thickness of the modified asphalt concrete wearing layer is 5 to 10 cm.

9. A method for paving a steel bridge deck suitable for heavy traffic, comprising paving the steel bridge deck paving structure suitable for heavy traffic as claimed in claim 1, characterized in that: The main steps include: S1. Welding pins on steel bridge deck; S2. Sandblasting and rust removal: First, pre-cleaning is performed, and dust and oil pollution are removed by using a high-pressure water gun and a cleaning agent. After the steel bridge deck is dry, sandblasting and rust removal are performed. The cleanliness must reach at least Sa2.5 level, and the roughness must reach at least 50-110μm; S3. Anti-corrosion coating: Within 4 hours after sandblasting and rust removal, use a manual roller to apply epoxy zinc-rich paint at a dosage of 150-200g / m 2 ; S4. Pavement of high-performance stress dispersion layer: transport the stress dispersion grid plate to the steel bridge deck, align the pin holes and the welded pins to ensure that the stress dispersion grid plate is firmly connected to the steel bridge deck, and then evenly pave the ultra-high performance concrete mixture on the steel bridge deck, and vibrate and compact it to ensure that the concrete is dense; S5. Pavement of waterproof bonding stress absorption layer: Before paving, the high-performance stress dispersion layer must be flat, clean and dry, and the waterproof bonding stress absorption layer must be spread. The amount of high-viscosity and high-elastic modified asphalt spread should be controlled at 2.2-2.5 kg / m 2 The amount of crushed stone paving should be controlled at 14-16 kg / m 2 , spread the gravel and then roll it, roll it 2 to 3 times. S6. Pave the modified asphalt concrete wear layer: After the waterproof bonding stress absorption layer is constructed, pave the modified asphalt concrete wear layer. The paving thickness is controlled at 5 to 10 cm and compact it after paving. During the paving and compaction process, keep the weather dry.

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