Layered hot-milling device, hot-air microwave composite in-situ heat regeneration complete set, and layered construction method thereof

Abstract

The invention discloses a layered hot milling device, a hot-air microwave composite in-situ heat regeneration complete set and a layered construction method thereof. The layered hot milling device comprises a hot-air heating machine, a front milling heating machine, a rear milling heating machine, a microwave tunnel heating machine, a feeding machine, a remixing machine and a remixing and regeneration machine, wherein the asphalt pavement is heated by local hot air layered heating, layered hot milling and layered conveying, which realizes semi-closed and low temperature construction, reduces energy consumption and improves construction efficiency. The new modular heating technology of hot wind variable power and microwave composite heating is adopted to realize the asphalt pavement non-destructive, uniform and high efficient heating, recover the asphalt pavement performance, smokeless and environmental protection, moderate heating depth, small temperature gradient between layers, no gradation damage in hot milling, the temperature of asphalt material in each link up to the standard, and high construction quality. The new material is added by dump truck and multi-function feeder, which realizes multi-degree of freedom, multi-direction feeding, accurate and continuous feeding, and small temperature drop of asphalt material.

Description

technical field [0001] The invention belongs to the technical field of road maintenance equipment, and in particular relates to a layered thermal milling equipment, a hot air microwave composite in-situ thermal regeneration complete set and a layered construction method. Background technique [0002] The huge maintenance workload of national and provincial arterial highways, especially expressways, the high standard of maintenance engineering quality and the maintenance operation environment under the condition of super-large traffic volume prompt us to seek a new maintenance method-in-place thermal regeneration, which is a kind of The special hot-in-place regeneration equipment heats and mills the asphalt pavement, and then mixes certain new aggregates, new asphalt, regenerants, etc. After mixing, paving, rolling and other processes, the surface can be repaired to a certain depth at one time. A range of technologies for the regeneration of old asphalt pavements. [0003] A...

AI Technical Summary

Problems solved by technology

[0004] (1) Scorched road surface, vegetation destruction, environmental pollution

Most pavement heaters use fuel oil / gas open flame heating, gas infrared heating or extensive high-power diesel hot air circulation heating. The heating temperature of asphalt pavement is not easy to control accurately, which will easily cause aging and coking of asphalt pavement, and the road performance of pavement after regeneration will decline. ; The high temperature and hot smoke around the construction will easily cause the green belt and trees to be scorched, accompanied by a large amount of toxic blue smoke, polluting the environment;

[0005] (2) Deep diseases cannot be treated, and the adaptability of construction technology is poor

At present, the one-time heating depth of in-situ thermal regeneration units on the market is mostly limited to 30mm to 40mm deep, resulting in limited regeneration thickness, deep-seated diseases cannot be well treated, and poor adaptability to working conditions; and from the construction technology point of view, currently only The realization of material addition and remixing regeneration process and remixing and overlaying process cannot realize simultaneous in-situ thermal regeneration of the upper layer and middle surface layer, and the remixing process of the remixing and overlaying process does not add a certain proportion of new asphalt mixture. However, by adding an appropriate amount of regenerant and then remixing and paving to form a regeneration layer, and then adding a certain thickness of new asphalt mixture on the regeneration layer, the real double-layer paving has not been realized.

[0006] (3) The temperature gradient between layers is large, the aggregate is easily damaged during milling, and the temperature of the recycled material is low, which affects the quality of the recycled material

According to statistics, the temperature of the asphalt material in the upper 10mm-20mm thick of the asphalt pavement is too high (up to 240°C), but the temperature of the asphalt material in the lower 30mm-50mm is only 70°C-80°C, with a large temperature gradient between layers and uneven heating; Moreover, due to the low temperature of the bottom layer, it is easy to cause damage to the aggregate gradation in the asphalt material during the milling process (white material appears), and the comprehensive temperature of the recycled material is only about 120 °C, and the direct paving temperature is low, which affects the regeneration quality; Infrared heating or hot air heating can raise the temperature of recycled materials twice. The heating temperature should not be precisely controlled, which will easily cause secondary aging of recycled materials and affect the quality of recycling.

[0007] (4) The leakage of flue gas and dust in the high-temperature road surface heating and hot milling links is large, polluting the environment

The hot-in-place regeneration unit on the market lacks high-temperature road surface heating and hot milling process flue gas and dust recovery and treatment measures, and the emission is not up to standard, unable to meet the requirements of relevant national environmental protection laws and regulations

[0008] (5) It is difficult to add new materials, and the heat loss is large

The frequent intermittent operation of the remixer recycler affects the quality of regeneration

At present, the addition of new asphalt mixture is mostly completed by transfer dump trucks, and after the road surface is heated and milled, a 200mm-300mm thick pile will be gathered up. Before the transfer dump truck is added, multiple road surface heating machines and heating milling machines need to Move forward 20m~30m, then transfer the dump truck across the thick material pile, ride on the material pile to feed into the hopper of the remixer recycling machine, causing the remixer recycler to stop working frequently, and thick material after feeding The stockpile is driven out, and then multiple heating machines and heating milling machines return to their positions to resume operation. This process of adding materials has defects such as difficulty in adding materials, long intervals, large heat loss, and poor regeneration flatness.

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