CN113356049A

CN113356049A - Railway steel bridge deck pavement structure

Info

Publication number: CN113356049A
Application number: CN202110764925.3A
Authority: CN
Inventors: 王民; 尚飞; 任万敏; 肖丽; 王亮; 梁春明; 王滔; 彭祝涛
Original assignee: Sichuan Ruitie Technology Co ltd; CHONGQING ZHIXIANG PAVING TECHNOLOGY ENGINEERING CO LTD
Current assignee: Sichuan Ruitie Technology Co ltd; CHONGQING ZHIXIANG PAVING TECHNOLOGY ENGINEERING CO LTD
Priority date: 2021-07-07
Filing date: 2021-07-07
Publication date: 2021-09-07

Abstract

The invention belongs to the technical field of bridge deck pavement, and particularly relates to a railway steel bridge deck pavement structure. The structure of mating formation includes tie coat and the protective layer of laying in proper order on the steel decking from bottom to top, the protective layer includes pouring type asphalt concrete, the tie coat has set gradually anticorrosive paint, water proof membrane and reactive adhesive from bottom to top. The structure of the present invention is excellent in fatigue resistance.

Description

Railway steel bridge deck pavement structure

Technical Field

The invention belongs to the technical field of bridge deck pavement, and particularly relates to a railway steel bridge deck pavement structure.

Background

In recent years, with the development of economy, the traffic on water is increasingly busy, and the requirement on the bridge span is also increasingly high.

The steel bridge has the advantages of light dead weight, large span, simple design, convenience in reinforcement, strong lateral wind resistance, convenience in construction and the like, and is widely applied to construction of modern large-span railway bridges (comprehensive analysis of pavement characteristics and design requirements of steel bridge surfaces, the Wangmen and the like, world bridges, No. 1 of volume 41 in 2013, No. 1-5 of section 1 in left column on page 39, and open day 12 and 31 days in 2013).

At present, the railway steel bridge mainly adopts a protective structure comprising a steel bridge deck, a concrete ballast groove plate, a waterproof layer and fine aggregate concrete. However, the protective structure is easy to crack in the actual use process, the durability is poor, the crack of the ballast baseplate is difficult to find in the daily inspection process, and in addition, the cost of the protective structure is high. In order to solve the problem, a protective structure adopting a steel bridge deck, a polyurea waterproof layer and a polyacrylonitrile fiber concrete protective layer is proposed, such as a Fujian line Lianxi and a grand bridge behind a dune. However, the protective structure still has the problems of cracking, loosening and the like under the action of complex stress. Steel bridge deck plates, epoxy zinc-rich paint anticorrosive layers, polyurea elastomer coatings and fine stone concrete protective structures are adopted, such as Dongxin Ganjiang bridge (railway new section steel bridge deck waterproof protective layer design research, afterglow and the like, railway standard design, No. 63 at No. 2 in 2019, No. 3 at the left fence at page 84, No. 1 to No. 2 at the right fence, No. 2 at 2019, 28 days 2 and month 2 in 2019).

However, the fatigue resistance of the protective structure is not good.

Disclosure of Invention

In view of the above, the present invention provides a railway steel deck pavement structure.

In order to achieve the purpose, the technical scheme of the invention is as follows:

railway steel bridge deck pavement structure includes and lays tie coat and the protective layer on the steel bridge deck board from bottom to top in proper order, the protective layer includes pouring type asphalt concrete, the tie coat has set gradually anticorrosive paint, water proof membrane and reactive adhesive from bottom to top.

Further, the roughness of the steel bridge deck plate is 50-100 μm.

Further, the cast asphalt concrete comprises cast asphalt concrete GA-10.

Further, the thickness of the protective layer is 25-35 mm.

Further, the waterproof membrane includes two layers.

Further, the thickness of each wet film is not less than 2.0mm, and the total thickness of the dry films is not less than 2 mm.

Further, the waterproof film includes a methacrylic resin film.

Further, the dosage of the anti-corrosion paint is 100-200g/m²。

In the invention, the anti-corrosion paint refers to paint capable of killing, inhibiting or preventing the growth of microorganisms or molds, such as acrylic anti-corrosion primer and the like.

Further, the total dosage of the waterproof membrane is 2500-3500g/m²。

Further, the dosage of the reactive adhesive is 100-200g/m²。

In the present invention, the reactive adhesive means an adhesive material based on a linear polymer or a low molecular weight compound having an active group, such as an acrylic adhesive.

In the invention, the reactive adhesive can be constructed by brushing, rolling or airless spraying.

The invention has the beneficial effects that:

the structure of the present invention is excellent in fatigue resistance.

The structure of the invention can improve the strength of the railway steel bridge deck.

Drawings

Fig. 1 is a pavement structure of example 1, which comprises a steel bridge deck, an anti-corrosive paint layer, a waterproof film layer, a reactive adhesive layer and a poured asphalt concrete layer from bottom to top in sequence;

FIG. 2 is a test panel for fatigue resistance tests;

fig. 3 is a schematic view of a forming process of an anti-fatigue test.

Detailed Description

The examples are provided for better illustration of the present invention, but the present invention is not limited to the examples. Therefore, those skilled in the art should make insubstantial modifications and adaptations to the embodiments of the present invention in light of the above teachings and remain within the scope of the invention.

Example 1

The railway steel bridge deck pavement structure shown in fig. 1 is as follows:

1. steel bridge deck sand blasting

A movable automatic dust-free sanding machine with a dust suction device is adopted, steel shots and steel corner sand are used as abrasive materials, and the steel bridge panel is subjected to sand blasting treatment, so that the roughness of the steel bridge panel is 50-100 mu m.

2. Adhesive layer

(1) Spraying anticorrosive paint

After the sand blasting treatment, spraying acrylic acid anticorrosive paint (Topever waterproof material from Zhixiang pavement technology engineering Co., Ltd. in Chongqing) within 4h, wherein the consumption is 150 g/square meter, and the dry film thickness is about 50 mu m;

(2) spray waterproof film

After the anticorrosion primer is cured, spraying methyl methacrylate resin film (topevers waterproof material from Zhixiang pavement technology engineering Co., Ltd. in Chongqing), constructing in two layers, wherein the thickness of each layer of wet film is not less than 1.2mm, the total thickness of the dry films is not less than 2mm, the total dosage is 2500 g/square meter, and spraying the second layer after the first layer is completely cured.

(3) Spray reactive adhesive

Spraying acrylic resin binder (topiver waterproof material from Zhixiang pavement technology engineering Co., Ltd. in Chongqing) immediately by brushing after the methacrylic resin film is sprayed for about 1h (room temperature 23 ℃); during construction, the reactive adhesive is separated from the joint and the lap joint area by a ruler; the spraying dosage of the reactive adhesive is 150 g/square meter, and the next procedure of construction is carried out after the complete curing.

3. Pouring type asphalt concrete layer

(1) Side restriction

When the pouring type asphalt mixture protective layer is paved, a steel baffle with the thickness of about 25-35mm and the width of 300mm is adopted and arranged at the edge of the connection part of the lane;

(2) paving machine

And spreading by a spreading machine. The special truck for the pouring asphalt concrete GA is inverted to the front of the paver, and the mixture is directly unloaded on the steel bridge deck through a discharge chute at the back of the truck; the paving thickness of the cast asphalt concrete GA is 30 mm;

following the paver, heating the seam and finishing the seam by a wooden scraper without rolling by a road roller;

and after the paved protective layer is cooled, the subsequent railway ballast and the railway can be paved without maintenance.

Performance detection

The pavement of example 1 (i.e., the structure except the steel plate) was subjected to a drawing test and fatigue resistance, and the results are shown in tables 1 and 2;

the detection method of the drawing test comprises the following steps: the test temperature is 40 ℃ and 25 ℃ respectively, and the stretching speed is 10 mm/min;

the method for detecting the fatigue resistance comprises the following steps:

and (3) manufacturing a test piece: the test steel sheets were treated by grit blasting according to standard DIN55928 part 4 (standard cleanliness factor sa2.5, according to standard DIN8201 part 9); the test board is 700mm × 200mm × 12mm (as shown in FIG. 2), the waterproof bonding layer, the paving lower layer and the paving surface layer are paved on the test board with the total length of 700mm and the width of 200mm, and the test piece is 700mm × 150 mm. The thickness of the asphalt concrete protective layer (lower layer of pavement) is 25mm, the thickness of the surface layer is 30mm, the total thickness of the test piece with the bonding layer and the waterproof layer is 55mm +/-2 mm, and the forming process is shown in figure 3;

test equipment: in the test, the test pieces are placed on three steel roller supports having a diameter of 50mm and a spacing L of 300 mm. The loading force is directly guided to the steel plate through a four-foot force application frame, and the strengthening force is applied to the area between the rollers on the bottom surface of the steel plate without the primer; the stiffening force beyond the edge of the side plate supports the force applying frame, and the stiffening force must prevent the plate from arching transversely; in the pulse bending fatigue test, load is applied by a single oil cylinder, and the single oil cylinder adopts a single cylinder which is controlled by the variable oil pressure or the servo limit hydraulic pressure of a hydraulic pulse machine; the loading function corresponds to a sinusoidal function, which varies between FG and F0 with a constant loading amplitude.

Experimental procedures and results: the pulsating bending fatigue test is carried out at the room temperature of 20 +/-3 ℃ (hereinafter referred to as room temperature); the maximum load F0 was chosen such that at the point of application of the test panel without structural layer, the bending L/600 was 0.5mm, with the load determined in this way, the test panel with the structural layer was first subjected to a static load and the bending was determined, the lowest load was determined at 0.15F 0; the maximum test load is F0, F0 is the maximum load when the bare board deforms by 0.5mm, 0.15F0 is taken as the lower limit of stress control, and the test load is between 0.15F0 and F0;

in the test process, a dial indicator or a dial indicator is adopted to measure the bending deformation of each pivot or the bending change possibly caused by the damage of the structural layer, and the position and the frequency of the damage such as the crack of the structural layer and the delamination from the test board are checked; the fatigue life (frequency) is more than 100 ten thousand times until the frequency of action when the damage such as delamination, cracking and the like occurs, the test is automatically stopped, and the fatigue performance is evaluated to be qualified.

And (4) analyzing results: according to the German test standard, the test temperature is 20 ℃ plus or minus 3 ℃, the test load is determined by the deformation of a bare board being 0.5mm, and the standard test load is 2.6kN-17.6 kN. In the test, the loading times when the damage such as delamination or cracking occurs for the first time are taken as the fatigue times; when the fatigue times exceed 100 ten thousand, the test is stopped; three test pieces were tested in parallel.

TABLE 1 test results of the drawing test Performance

TABLE 2 anti-fatigue test Performance test results

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. Railway steel bridge deck pavement structure, its characterized in that includes and lays tie coat and the protective layer on the steel bridge deck slab in proper order from bottom to top, the protective layer includes pouring type asphalt concrete, the tie coat has set gradually anticorrosive paint, water proof membrane and reactive adhesive from bottom to top.

2. A railway steel deck pavement structure according to claim 1, wherein the roughness of the steel deck slab is 50-100 μm.

3. The railway steel deck pavement structure according to claim 1 or 2, wherein the cast asphalt concrete comprises cast asphalt concrete GA-10.

4. A railway steel deck pavement structure according to any one of claims 1 to 3, wherein the protective layer has a thickness of 25 to 35 mm.

5. A railway steel deck pavement structure according to any one of claims 1 to 4, wherein said waterproofing membrane comprises two layers.

6. A railway steel deck pavement structure according to claim 5, wherein the thickness of each wet film is not less than 2.0mm and the total thickness of the dry films is not less than 2 mm.

7. A railway steel deck pavement structure according to any one of claims 1 to 6, wherein said waterproofing membrane comprises a methacrylic membrane.

8. The railway steel deck pavement structure as claimed in any one of claims 1 to 7, wherein the amount of the anti-corrosive paint is 100-200g/m²。

9. The railway steel deck pavement structure as claimed in any one of claims 1 to 8, wherein the total amount of the waterproof membrane is 2500-²。

10. The railway steel deck pavement structure according to any one of claims 1 to 9, wherein the amount of the reactive adhesive is 100-200g/m²。