Foot bridge deck pavement layer structure containing ceramsite concrete and construction method thereof

Abstract

The invention provides a footbridge deck pavement layer structure containing ceramsite concrete and a construction method of the footbridge deck pavement layer structure, and belongs to the technical field of bridge deck pavement. The waterproof anti-corrosion steel plate comprises a steel plate base surface, and a waterproof anti-corrosion layer, a leveling layer, a paving lower layer, an anti-skid surface layer and a cover agent layer which are sequentially paved from bottom to top, gravel is laid on the waterproof anti-corrosion layer, the paving lower layer is paved on the leveling layer through a mixture of resin and ceramsite, and the anti-skid surface layer is arranged on the paving lower layer in a blade coating mode and is provided with ceramsite in a spreading mode. The broken stones are laid on the waterproof anti-corrosion layer, deformation of the interface layer is restrained, the cracking risk of the pavement layer is reduced, the lower pavement layer is coated with the polyurethane cementing material in a scraping mode, the ceramsite is scattered, and the polyurethane cementing material and the ceramsite cooperate to enhance the anti-skid coefficient. According to the construction method, mechanical paving is not needed, construction is convenient, and traffic can be opened within 7 days. The method has the advantages of low cost, high convenience and flexibility (no heavy machinery limitation) and extremely fast open traffic capacity far better than that of a traditional method, and brings remarkable social benefits and economic benefits.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge deck pavement, and in particular to a pedestrian bridge deck pavement layer structure containing ceramsite concrete and a construction method thereof. Background Art

[0002] In the construction of pedestrian bridge decks, traditional steel deck paving systems are widely used, requiring paving and compacting equipment for construction. Given that construction loads are significantly higher than operational loads, the design of bridge steel structures requires additional steel to meet construction strength requirements. This results in low steel utilization and poor project economics. According to the current industry standard, "Technical Specifications for Urban Pedestrian Bridges and Pedestrian Tunnels" (CJJ 69-95), overpass pavement must meet technical requirements such as flatness, slip resistance, drainage, low noise levels, and ease of maintenance. With socioeconomic development and changes in travel patterns, the composition of non-motorized vehicles has undergone significant changes: the proportion of traditional bicycles continues to decline, while the illegal use of heavy vehicles such as electric bicycles, mopeds, and motorcycles is increasing. This places higher demands on the load-bearing performance of pedestrian bridge pavement systems. Engineering practice has verified that the traditional paving system has the following technical defects: first, the pavement layer and the steel structure have insufficient collaborative deformation capabilities, which can easily cause structural cracks; second, the interface bonding strength between the waterproof and anti-corrosion layer and the pavement layer does not meet the standards; third, the surface anti-slip material has insufficient wear resistance; fourth, the construction process relies on heavy machinery, which limits on-site operation efficiency. Summary of the Invention

[0003] In view of this, in order to solve the technical problems in the prior art such as insufficient coordinated deformation ability of the pavement layer and the steel structure and insufficient anti-slip performance, on the one hand, the present invention provides a pedestrian bridge deck pavement layer structure containing expanded clay concrete, which restrains the deformation of the interface layer and reduces the risk of cracking of the pavement layer by laying gravel on the waterproof and anti-corrosion layer, and applies polyurethane binder on the lower layer of the pavement and spreads expanded clay, so that the polyurethane binder and expanded clay synergistically enhance the anti-slip coefficient.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A pedestrian bridge deck pavement structure containing ceramsite concrete, comprising a steel plate base and a waterproof and anti-corrosion layer, a leveling layer, a pavement lower layer, an anti-slip surface layer and a finishing agent layer paved in sequence from bottom to top;

[0006] Gravel is laid on the waterproof and anti-corrosion layer, the paving lower layer is paved on the leveling layer with a mixture of resin and expanded clay, and the anti-skid surface layer is coated with polyurethane binder and glazed clay is spread on the paving lower layer.

[0007] Preferably, the particle size of the crushed stone is 3 to 5 mm, and the coverage is 50% to 70%.

[0008] Preferably, the leveling layer is:

[0009] Use a toothed knife to scrape and apply high-toughness modified epoxy resin polymer mixture on welds and local low-lying areas.

[0010] Preferably, the amount of the modified epoxy resin polymer mixture per millimeter is 2kg / m 2 .

[0011] Preferably, the amount of the covering agent in the covering agent layer is 0.3 kg / m 2 .

[0012] On the other hand, the present invention also provides a construction method for the above-mentioned pedestrian bridge deck pavement layer structure containing expanded clay concrete, which includes, in sequence, rust removal of the steel plate base surface, paving of a waterproof and anti-corrosion layer using a cold paving process, a leveling layer, a paving lower layer, an anti-slip surface layer and a finishing agent layer.

[0013] Preferably, the steel plate base surface is derusted by using a shot blasting process.

[0014] The present invention has the following beneficial effects compared to the prior art:

[0015] The ceramsite-containing concrete bridge deck pavement structure provided by the present invention has multiple significant advantages:

[0016] First, the gravel layer laid on top of the waterproof and anti-corrosion layer can effectively constrain the deformation of the interface layer. This design innovation significantly reduces the risk of cracking in the pavement layer and improves the stability and durability of the structure.

[0017] Secondly, by applying polyurethane binder to the lower layer of the pavement and evenly spreading ceramsite, a synergistic effect between the polyurethane binder and ceramsite is achieved. This synergistic effect not only enhances the pavement's anti-slip coefficient, improving driving safety, but also further improves the overall performance of the pavement.

[0018] In addition, the present invention adopts a cold-laying process in its construction method. This process not only simplifies the construction process and reduces energy consumption during construction, but also further improves the compressive strength of the pavement layer through the carefully designed ceramsite grading, making it able to withstand greater loads and wear.

[0019] This construction method requires no mechanized paving, is easy to construct, and can be opened to traffic within seven days. It offers low cost, high convenience, and flexibility (no heavy machinery restrictions), as well as an extremely fast opening capacity far exceeding traditional methods, bringing significant social and economic benefits.

[0020] In summary, the pavement structure and construction method provided by this invention not only significantly improve the performance and stability of bridge deck pavement, but also reduce maintenance costs over its entire lifecycle by over 30%. This innovation provides a cost-effective solution for the long-term use of bridges and has broad application prospects and market value. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention;

[0022] In the figure, 1. Steel plate base; 2. Waterproof and anti-corrosion layer; 3. Leveling layer; 4. Paving lower layer; 5. Anti-slip surface layer; 6. Topcoat layer. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work shall fall within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", "top / bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the present invention.

[0025] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "mounted / connected," and "connected" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0026] like Figure 1 As shown, the present invention provides a pedestrian bridge deck pavement layer structure containing ceramsite concrete, including a steel plate base 1 and a waterproof and anti-corrosion layer 2, a leveling layer 3, a pavement lower layer 4, an anti-slip surface layer 5 and a finishing agent layer 6 paved from bottom to top.

[0027] The waterproof and anti-corrosion layer 2 is paved with crushed stone, the paving lower layer 4 is paved on the leveling layer 3 with a mixture of resin and ceramsite, and the anti-skid surface layer 5 is scraped with polyurethane binder and ceramsite is spread on the paving lower layer 4. In the present invention, the interface glue is scraped or rolled on the steel plate base surface 1, and the amount is preferably 1.2 kg / m 2 At the same time, 3-5mm crushed stone (dry and clean) is spread at a coverage rate of 50% to 70%, transforming the interface into a rougher one and restraining deformation of the upper layer. This treatment method can significantly restrain deformation of the upper layer and improve the stability and durability of the overall structure.

[0028] In the present invention, the leveling layer 3 is: for the welds and local low-lying areas, a toothed knife is used to scrape a high-toughness modified epoxy resin (in the present invention, the amount of the modified epoxy resin polymer mixture per millimeter is 2kg / m 2 ) polymer mixture. Its advantages are mainly reflected in the following aspects:

[0029] 1. Precise leveling: The design of the toothed blade enables the thickness and uniformity of the mixture to be more accurately controlled during the scraping process, effectively filling and leveling welds and local low-lying areas to ensure the flatness of the ground or structure.

[0030] 2. High strength and toughness: High-toughness modified epoxy resin polymer mixture has high strength and toughness, can effectively resist external stress and impact, and improve the stability and durability of the overall structure.

[0031] 3. Good adhesion: The mixture has good adhesion to the base layer, which can ensure close bonding between the leveling layer 3 and the base layer, avoid problems such as delamination and hollowing, and improve the reliability of the overall structure.

[0032] 4. Convenient construction: Using a toothed scraper for scraping is convenient and quick, which can greatly shorten the construction period and improve work efficiency. At the same time, the mixture is easy to stir and scrape, reducing the construction difficulty and labor costs.

[0033] 5. Corrosion resistance and wear resistance: The high-toughness modified epoxy resin polymer mixture has excellent corrosion resistance and wear resistance, can resist the erosion of various chemical substances and mechanical wear, and extend the service life of the leveling layer 3.

[0034] In summary, the toothed knife is used to scrape the high toughness modified epoxy resin polymer mixture as

[0035] In the present invention, the ceramsite used for the paving lower layer 4 and the anti-slip surface layer 5 is preferably colored ceramsite. The 10-35 mm thick colored paving layer in the paving lower layer 4 is preferably made of resin-mixed colored ceramsite, and cold laying is employed. The polymer mixture is made of graded colored ceramsite, with a 7% rubber-to-stone ratio, and stirred in a blender for 2-3 minutes to fully mix the mixture. The mixture is then transported to the site by bucket truck for paving, leveling, and compacting.

[0036] In the present invention, the anti-slip surface layer 5 adopts the process of scraping polyurethane binder and spreading colored ceramsite synchronously. During construction, the process and material ratio should be adjusted according to the gradation of the colored resin ceramsite of the lower layer 4 and the construction environment and climate, so as to ensure that the polyurethane binder fills the gaps of the resin colored ceramsite concrete as much as possible while avoiding foaming due to too high a filling amount. The general material dosage is 3.0-4.0 kg / m 2 The actual amount depends on the project site conditions. After the polyurethane anti-skid glue is smoothed, immediately spread the ceramic particles, the amount is 7kg / m 2 , in order to form a certain structural depth to achieve anti-slip and wear-resistant effects.

[0037] In the present invention, the amount of the covering agent in the covering agent layer 6 is 0.3 kg / m 2 Preferably, the coating agent is applied after the protective layer of ceramsite is completely removed, and an airless sprayer is used for spraying at a dosage of 0.3 kg / m 2 , after completion and opening to traffic.

[0038] On the other hand, the present invention also provides a construction method for the above-mentioned pedestrian bridge deck pavement layer structure containing expanded clay concrete, which comprises, in sequence, rust removal of the steel plate base surface 1, paving of a waterproof and anti-corrosion layer 2 using a cold paving process, a leveling layer 3, a paving lower layer 4, an anti-slip surface layer 5 and a finishing agent layer 6.

[0039] In the present invention, the steel plate base surface 1 is derusted by using a shot blasting process.

[0040] Based on the above construction method, the present invention provides the following specific construction method:

[0041] Notes:

[0042] Before the paving construction begins, the construction unit should submit the quality inspection report of the raw material supplier and the project inspection report. After the construction and inspection of the test road are completed, a summary and commencement application report shall be submitted. Construction can only begin after the supervision engineer signs and approves it and the commencement order is issued.

[0043] After each paving construction process is completed, it must be accepted by the supervising engineer before the next process can be carried out.

[0044] The processes that require acceptance include:

[0045] (1) Shot blasting and rust removal of steel plates;

[0046] (2) Anti-corrosion and waterproof layer;

[0047] (3) Leveling layer 3;

[0048] (4) Paving the lower layer 4;

[0049] (5) anti-slip surface layer 5;

[0050] (6) Overcoat layer 6.

[0051] From the beginning of construction (shot blasting and rust removal) to the completion of the pavement surface layer construction, traffic should be closed to each section of pavement and no other projects other than pavement construction should be allowed to cross-operate.

[0052] Material transport vehicles should enter the paving construction area according to the prescribed operating methods. All other vehicles (including cars), personnel and machinery not related to the construction are strictly prohibited from entering the paving construction area.

[0053] After the paving is completed, the construction units of other projects (such as crash barriers, traffic signs, etc.) should pay full attention to protecting the steel bridge deck pavement layer.

[0054] Preparation before paving construction:

[0055] Before steel bridge deck paving construction begins, the necessary machinery, testing equipment, and paving materials must be prepared. On-site mix design, test mixing and sampling performance testing, raw material performance testing, and detailed construction organization design must be completed. All machinery and equipment must be maintained in good working condition, and all measuring equipment must be calibrated.

[0056] Bridge deck pavement

[0057] Before shot blasting

[0058] (1) Before shot blasting, the appearance of the steel bridge deck should be checked first to ensure that there are no weld nodules, spatters, pinholes, flash and burrs on the surface. Otherwise, they must be removed by grinding. Sharp edges and corners must be processed to a radius of more than 2mm.

[0059] (2) Use detergent or solvent to clean the oil, grease, salt and other dirt on the surface of the steel bridge deck.

[0060] (3) Clean with high-pressure water until there is no oil or dirt.

[0061] Shot blasting

[0062] (1) Environmental requirements

[0063] a. Rust removal is strictly prohibited in rainy, snowy, condensation and other weather conditions.

[0064] b. The shot blasting temperature should be 3°C higher than the dew point and the relative humidity should be ≤85%.

[0065] (2) Abrasive requirements

[0066] a. The abrasive materials used are steel shot and steel angular sand, and their proportions are determined through experiments.

[0067] b. Abrasives must be kept dry, clean, and free of harmful substances such as grease and salt.

[0068] (3) Shot blasting quality requirements

[0069] a. The surface of the steel bridge deck after shot blasting and rust removal should meet the requirements of GB8923-88 standard Sa2.5.

[0070] b. The roughness requirement must reach Rz: 50~100μm.

[0071] (4) Shot blasting equipment

[0072] a. Use a mobile automatic dust-free sand blasting machine with a dust suction device.

[0073] b. For areas and edges that cannot be constructed by automatic dust-free sand blasting machines, portable sand blasting machines can be used.

[0074] Anti-corrosion and waterproof layer

[0075] High-toughness modified epoxy resin materials are implemented on steel bridge decks that have passed the shot blasting and rust removal inspection. Specific construction requirements are implemented in accordance with the construction guidelines provided by the material supplier.

[0076] Environmental requirements during construction:

[0077] (1) The base surface must be dry, clean, free of oil, foreign matter and dust.

[0078] (2) When encountering rain, snow, condensation and other weather conditions, coating operations are strictly prohibited.

[0079] (3) Ambient temperature: -10~50℃, relative humidity ≤85%.

[0080] (4) The steel plate temperature is higher than the dew point of 0℃.

[0081] Specific requirements for coating operation:

[0082] (1) Construction of anti-corrosion and waterproof layer

[0083] After passing the shot blasting inspection, apply an anti-corrosion primer within 6 hours. This is typically done by roller coating at a rate of 1.2g / m². Gravel or ceramsite (2-3mm in diameter) should also be sprinkled before the epoxy cures. The gravel should be washed and dried, and the mud content strictly controlled. Transport and storage require sealing and moisture-proofing. During application, the coverage should be 50%-70% to create a rougher interface and limit deformation of the upper layer.

[0084] Local leveling layer 3

[0085] (1) Steel plate welds, steel plates and low-lying areas on concrete surfaces should be leveled.

[0086] (2) The qualified base surface must be kept dry, clean, and free of harmful substances such as grease and salt. The ambient temperature must be between -10 and 60°C.

[0087] (3) Use high-toughness modified epoxy resin polymer scraping construction, the dosage per millimeter is 2kg / m 2 , making the overall base surface smoother, achieving a smooth surface without water accumulation and without obstruction to traffic.

[0088] (4) Pour the stirred high-toughness modified epoxy resin polymer onto the work surface and use a toothed scraper to smooth the glue. After adding the initiator, the material must be used within 20 minutes.

[0089] Paving the lower layer 4

[0090] (1) After the leveling layer 3 is constructed and solidified, the site should be kept clean and tidy, and the waterproof layer should be dry, free of damage, stains, and harmful substances such as grease and salt.

[0091] (2) The modified resin graded colored expanded clay thin layer should be constructed according to the site environment, and the construction temperature should not be lower than 0℃.

[0092] (3) The entire pavement is paved with a horizontal slope of 0.5% with a height in the middle and a height of 0.5% on both sides. The thickness is 10 to 35 mm and the dosage is 18 to 63 kg / m 2 According to the ratio of rubber to stone of 7%, stir the mixture in the mixer for 2-3 minutes on site to fully mix the mixture, then transport it to the site with a bucket truck for paving, leveling and compacting. The construction needs to be completed in one row.

[0093] (4) Before construction, it is necessary to mark the lines and set up the formwork according to the elevation requirements and prepare the construction tools.

[0094] (5) When construction requires divided construction, the joints must be uniform and the overall appearance must be beautiful.

[0095] Anti-slip layer

[0096] (1) The polyurethane colored anti-slip adhesive can be applied only after the lower pavement layer 4 has been cured.

[0097] (2) After the working surface is processed and inspected, start applying tape. The purpose of applying tape is to standardize the edge of the working surface.

[0098] (3) Before use, stir the polyurethane binder evenly with a stirrer until there is no clumping or sediment at the bottom of the barrel.

[0099] (4) Add the aggregate to the binder and mix well. At the same time, the people who will scrape the glue and roll it should be ready.

[0100] (5) Add the initiator and stir for 120 seconds before starting construction. Pour the stirred polyurethane pavement mixture onto the work surface and use a toothed scraper to smooth the glue. The material must be used within 10 minutes. The general material dosage is 3.0-4.0 kg / m 2 The actual usage depends on the project site conditions.

[0101] (6) After the colored base coat is smoothed, immediately spread ceramic particles at a dosage of 7kg / m 2 , in order to form a certain structural depth to achieve anti-slip and wear-resistant effects.

[0102] (7) After spreading, the tape must be removed before the colored pavement layer solidifies.

[0103] (8) After the base coating is cured, the excess ceramic particles / corundum are collected and recycled.

[0104] Finish layer 6

[0105] (1) After the color base coat is completely cured and dried, a strengthening topcoat should be applied immediately to avoid surface contamination of the color base coat.

[0106] (2) Before applying the finishing agent, it is necessary to clean the ceramsite that is not firmly bonded to the surface of the anti-slip layer several times and thoroughly remove it before applying the finishing agent. Use an airless sprayer to spray it at a dosage of 0.3kg / m 2 After completion and opening to traffic, it is normal that a small amount of expanded clay still falls off. Generally, another cleaning after 5-7 days of operation can stop the expanded clay from falling off. If conditions permit, another covering agent operation can be carried out.

[0107] (3) After the construction is completed, it should be naturally cured and traffic can be opened only after the durable topcoat is completely dry.

[0108] The above description is merely a preferred embodiment of the present invention. However, the scope of protection of the present invention is not limited thereto; any person skilled in the art who, within the technical scope disclosed by the present invention, makes equivalent substitutions or modifications based on the technical solutions and improved concepts of the present invention shall be covered by the scope of protection of the present invention.

Claims

1. A pedestrian bridge deck pavement structure containing ceramsite concrete, characterized in that: It includes a steel plate base and a waterproof and anti-corrosion layer, a leveling layer, a paving lower layer, an anti-slip surface layer and a finishing agent layer laid in sequence from bottom to top; Gravel is laid on the waterproof and anti-corrosion layer, the paving lower layer is paved on the leveling layer with a mixture of resin and expanded clay, and the anti-skid surface layer is coated with polyurethane binder and glazed clay is spread on the paving lower layer.

2. The pedestrian bridge deck pavement structure containing ceramsite concrete according to claim 1, characterized in that: The particle size of the crushed stone is 3-5 mm, and the coverage rate is 50%-70%.

3. The pedestrian bridge deck pavement structure containing ceramsite concrete according to claim 1, characterized in that: The leveling layer is: Use a toothed knife to scrape and apply high-toughness modified epoxy resin polymer mixture on welds and local low-lying areas.

4. The pedestrian bridge deck pavement structure containing ceramsite concrete according to claim 3, characterized in that: The amount of the modified epoxy resin polymer mixture per millimeter is 2kg / m 2 .

5. A pedestrian bridge deck pavement structure containing ceramsite concrete according to any one of claims 1 to 4, characterized in that: The amount of the covering agent in the covering agent layer is 0.3 kg / m 2 .

6. A construction method for a pedestrian bridge deck pavement structure containing ceramsite concrete according to any one of claims 1 to 5, characterized in that: It includes rust removal of steel plate base, cold laying of waterproof and anti-corrosion layer, leveling layer, lower layer, anti-slip surface layer and topcoat layer.

7. The construction method of a pedestrian bridge deck pavement structure containing ceramsite concrete according to claim 6, characterized in that: The steel plate base surface is derusted by shot blasting process.

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