Tunnel smokeless ultra-thin surface structure

Abstract

The present application belongs to the technical field of tunnel pavement paving, and particularly relates to a tunnel smokeless ultrathin overlay structure, which comprises a quick-drying waterproof coating and a smokeless asphalt thin layer sequentially laid on the original tunnel pavement, wherein the quick-drying waterproof coating is composed of matrix asphalt, cationic surfactant, water, film-forming aid, cellulose, hydrochloric acid, ammonium chloride, butadiene-styrene rubber, styrene-butadiene rubber, petroleum resin, defoaming agent, dispersant and preservative, and the smokeless asphalt thin layer is composed of smokeless additives, mixed aggregate and cementing material, and has a laying thickness of 1.2-2.0 cm. The present application can improve the severe smoke pollution in the tunnel, facilitate construction, and has the effect of reducing noise pollution in the tunnel due to the special gradation design of the smokeless ultrathin overlay.

Description

Technical Field

[0001] This invention belongs to the field of tunnel pavement technology, specifically relating to a smokeless ultra-thin overlay structure for tunnels. Background Technology

[0002] In traditional tunnel asphalt paving, the high temperatures of the asphalt release large amounts of harmful asphalt fumes, severely polluting the construction environment and posing a threat to the health of construction workers. Currently, tunnel asphalt technology focuses primarily on flame retardancy, with very limited smoke suppression effects. Research on low-smoke, low-toxicity, low-odor, environmentally friendly, and low-pollution aspects during construction is limited. While some engineering solutions exist to reduce asphalt paving temperature, such as tunnel micro-surfacing and epoxy wearing-resistant layers within tunnels, these have some effect but still cannot meet the performance requirements of high-grade highways. Summary of the Invention

[0003] In view of the above-mentioned shortcomings in the prior art, the present invention provides a smokeless ultra-thin tunnel canopy structure to solve the above-mentioned problems.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A smokeless ultra-thin overlay structure for tunnels includes a quick-drying waterproof coating and a smokeless asphalt thin layer laid sequentially on the original tunnel surface. The quick-drying waterproof coating is composed of a mixture of base asphalt, cationic surfactant, water, film-forming aid, cellulose, hydrochloric acid, ammonium chloride, styrene-butadiene rubber, styrene-butadiene rubber, petroleum resin, defoamer, dispersant, and preservative. The smokeless asphalt thin layer is composed of a mixture of smokeless additives, aggregates, and binder, and its laying thickness is 1.2-2.0 cm.

[0006] Furthermore, the smoke-free additive is a viscosity-reducing and smoke-suppressing additive, which is composed of a mixture of PE WA, FT WA, EBS, amide wax, glycerin, oleic acid, lignoamine, cyanamide, magnesium hydroxide, aluminum hydroxide, flame retardant, smoke suppressant, organic iron catalyst, molybdenum catalyst, palladium catalyst and titanate coupling agent.

[0007] Furthermore, the mixed aggregate includes basalt, diabase, crushed pebbles, limestone, and corundum.

[0008] Furthermore, the binder is modified asphalt, which is made of SBS, SBR, SIS, SEBS, PE, POE and natural rubber.

[0009] Compared with the prior art, the present invention has the following beneficial effects:

[0010] The tunnel smokeless ultra-thin overlay paving temperature of this invention is 125-150℃. During construction, it is smokeless, dustless, and odorless, reducing the emission of harmful substances. It can reduce the noise generated by vehicles and improve the environment inside the tunnel. Smokeless asphalt paving improves the anti-skid performance of the road surface and reduces the incidence of traffic accidents. It has wide application value in the field of tunnel pavement paving for municipal roads and highways. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of an embodiment of the smokeless ultra-thin tunnel canopy structure of the present invention. Detailed Implementation

[0012] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0013] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0014] Example:

[0015] Example 1

[0016] like Figure 1 As shown, the present invention provides a tunnel smokeless ultra-thin overlay structure, comprising a quick-drying waterproof coating and a smokeless asphalt thin layer sequentially laid on the original tunnel surface.

[0017] A quick-drying waterproof coating is used for complete interlayer bonding. It has a faster surface drying time and can cure and form faster in tunnels. The actual drying time is less than 3 hours, and the adhesion strength at 25°C is greater than 0.6MPa. A quick-drying waterproof coating component for a tunnel smokeless ultra-thin overlay structure includes No. 70 base asphalt, quaternary ammonium salt cationic surfactant, water, PVA film-forming aid, ethyl cellulose, concentrated hydrochloric acid, ammonium chloride, styrene-butadiene rubber, petroleum resin, defoamer, calcium chloride, and sulfonated asphalt powder.

[0018] The smokeless asphalt thin layer, with specially designed smokeless additives, can form a lubricating interface between asphalt molecular clusters and inhibit the breaking of small molecular bonds, thereby achieving a low-smoke or smokeless effect. Its paving thickness is 1.2cm.

[0019] Smokeless asphalt thin films consist of smokeless additives, mixed aggregates, and binders.

[0020] The mixed aggregates include basalt, diabase, crushed pebbles, limestone, and corundum.

[0021] The screening criteria for mixed granular materials are as follows:

[0022] Mineral gradation pass rate requirement table

[0023]

[0024] The binder is modified asphalt, which is made of SBS, SBR, SIS, SEBS, PE, POE, and natural rubber.

[0025] Smoke-free additives are viscosity-reducing and smoke-suppressing additives, including PE WA, FT WA, EBS, amide wax, glycerin, oleic acid, lignoamine, cyanamide, magnesium hydroxide, aluminum hydroxide, flame retardants, smoke suppressants, organic iron catalysts, molybdenum catalysts, palladium catalysts, and titanate coupling agents.

[0026] The special gradation design and elastic materials can reduce the noise generated by vehicles during operation and improve the environment inside the tunnel.

[0027] The specific construction steps for laying the smokeless ultra-thin overlay structure inside the tunnel are as follows:

[0028] Step 1: The original road surface cleaning work should be carried out using negative pressure sweeping equipment; blowers should not be used.

[0029] Step 2: Spray non-stick waterproof coating. The amount of coating to be sprayed is generally 0.3-0.5 kg / m². Pay attention to even spraying.

[0030] Step 3: The smokeless additive is directly added to the mixing tank of the asphalt mixing plant and mixed with SBS modified asphalt PG76-22 and basalt aggregate. The smokeless additive must be able to disperse quickly. After the heated 0-4mm, 4-7mm, and 7-11mm aggregates are weighed and added to the mixing tank, 0.4% of the smokeless additive is quickly added and mixed with the aggregates. The dry mixing time is controlled at about 5-10 seconds. Then, asphalt is sprayed in, and after proper mixing, mineral powder is sprayed in. The wet mixing time is until the asphalt can evenly coat the aggregates, which is about 30-35 seconds. The total mixing time is generally more than 40 seconds.

[0031] Step Four: For smokeless thin-layer construction, use a 3-6M wide asphalt paver. Preheat for 30 minutes before paving to reach the required paving temperature. The paving temperature should be controlled between 125-150℃. Use one paver and an ultrasonic mobile leveling beam for leveling. The loose layer thickness should be controlled at 1.4cm. The paver's travel speed is generally controlled between 2 and 9 meters per minute. Use a double-drum roller (under 13 tons) that meets the road compaction requirements for rolling. The roller must closely follow the paving equipment, maintaining static pressure throughout the process.

[0032] Example 2

[0033] The specific construction steps for laying the smokeless ultra-thin overlay structure inside the tunnel are as follows:

[0034] Step 1: The original road surface is cleaned using deep negative pressure equipment, with no dust generated throughout the process.

[0035] Step 2: Spray water-in-oil waterproof coating. The amount of coating to be sprayed is generally 0.25-0.35 kg / m², and it is advisable to use a machine sprayer.

[0036] Step 3: The smokeless additive is directly added to the mixing tank of the asphalt mixing plant and mixed with SBS modified asphalt (IC type) and basalt aggregate. The smokeless additive must have warm mixing capability, smoke suppression capability, and rapid dispersion capability. After the heated mineral powder, 0-4mm and 4-7mm aggregate are weighed and added to the mixing pot, 0.3% of the smokeless additive is quickly added and mixed with the aggregate. The dry mixing time is controlled at about 5-10 seconds. Then, asphalt is sprayed in, and after appropriate mixing, mineral powder is sprayed in. The wet mixing time is until the asphalt can evenly coat the aggregate, which is about 30-35 seconds. The total mixing time is generally more than 40 seconds.

[0037] Furthermore, the screening criteria for the mixed granular materials are as follows:

[0038] Mineral gradation pass rate requirement table

[0039]

[0040] Step 4: For smokeless thin-layer construction, use a 2.5-5m wide asphalt paver. Preheat for 30 minutes before paving to reach the paving temperature, which should be controlled at 125-135℃. If two pavers are used in a coordinated team, the paver at the edge should lead, with ultrasonic mobile leveling beams used on both outer sides. The other paver should follow closely behind, 3-5 meters behind, with a 10-15cm overlap in the middle. The paver's travel speed should generally be controlled between 2-9 meters per minute. Use a 12-ton double-drum roller that meets the road compaction requirements for compaction. The roller should closely follow the paving equipment and apply static pressure throughout the process.

[0041] Example 3

[0042] The specific construction steps for laying a smokeless ultra-thin overlay structure on the road surface are as follows:

[0043] Step 1: Pre-mill the original road surface using a Wirtgen 1900 model machine and a dry vacuum cleaner.

[0044] Step 2: Apply PB-Ⅱ type road and bridge special waterproof coating by spraying, with a dosage of more than 500g per square meter.

[0045] Step 3: The smokeless additive is added directly into the modified asphalt tank of the asphalt mixing plant and premixed with SBS modified asphalt ID type for more than 3 hours. It is then pumped into the mixing drum and mixed with diabase stone aggregate. The smokeless additive must have excellent rapid dispersion and suspension capabilities. The heated 0-3mm and 3-6mm stone aggregates are weighed and added to the mixing pot. The dry mixing time is controlled at about 5-15 seconds. Then, the modified asphalt with premixed smokeless additive is sprayed in and mixed with the stone aggregate. The wet mixing time is until the asphalt can evenly coat the aggregate, which is about 25-35 seconds. The total mixing time is generally more than 35 seconds.

[0046] Step 4: During the smokeless thin-layer construction, the paving thickness is 1.5cm. An asphalt paver is used. Before paving, the asphalt is preheated for 35 minutes to reach the paving temperature, which is controlled at 130-145℃. One paver is used for operation, and an ultrasonic mobile leveling beam is used for leveling. The loose paving thickness is controlled at 1.7cm. The paver's travel speed is generally controlled in the range of 3-8 meters / minute. A double steel drum roller that meets the road compaction requirements is used for rolling. The roller must closely follow the paving equipment and maintain static pressure throughout the process.

[0047] The above are merely embodiments of the present invention. Commonly known structures and characteristics of the solutions are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

[0048] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the 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, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0049] In the description of this invention, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating a connection between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

Claims

1. A smokeless ultra-thin tunnel canopy structure, characterized in that: The coating consists of a quick-drying waterproof coating and a smokeless asphalt thin layer laid sequentially on the original tunnel surface. The quick-drying waterproof coating is composed of a mixture of base asphalt, cationic surfactant, water, film-forming aid, cellulose, hydrochloric acid, ammonium chloride, styrene-butadiene rubber, styrene-butadiene rubber, petroleum resin, defoamer, dispersant, and preservative. The smokeless asphalt thin layer is composed of a mixture of smokeless additives, aggregates, and binder. The thickness of the layer is 1.2-2.0 cm.

2. The tunnel smokeless ultra-thin canopy structure as described in claim 1, characterized in that: The smoke-free additive is a viscosity-reducing and smoke-suppressing additive, which is composed of PE WA, FT WA, EBS, amide wax, glycerin, oleic acid, lignoamine, cyanamide, magnesium hydroxide, aluminum hydroxide, flame retardant, smoke suppressant, organic iron catalyst, molybdenum catalyst, palladium catalyst and titanate coupling agent.

3. The tunnel smokeless ultra-thin canopy structure as described in claim 1, characterized in that: The mixed aggregate includes basalt, diabase, crushed pebbles, limestone, and corundum.

4. The tunnel smokeless ultra-thin canopy structure as described in claim 1, characterized in that: The binder is modified asphalt, which is made of SBS, SBR, SIS, SEBS, PE, POE and natural rubber.

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