Composite pavement structure for urban down-traversing pavement and construction method

Abstract

The invention relates to the field of road construction, in particular to a composite pavement structure for an urban down-traversing pavement and a construction method. The pavement structure comprises a motor vehicle lane pavement structure, a non-motor vehicle lane pavement structure and a sidewalk pavement structure. The motor vehicle lane pavement structure and the non-motor vehicle lane pavement structure each comprise a cement stabilized macadam layer, an SBS modified emulsified asphalt lower sealing layer, a continuous reinforcement concrete layer, a rubber stress absorption layer and fine grain type SBS modified asphalt concrete which are sequentially laid. The sidewalk pavement structure comprises gravels, C20 concrete, cement mortar and Sure block bricks all of which are sequentially laid. The construction method comprises the steps that a down-traversing channel is obtained through construction of an open cut method or a shallow tunneling method, a road foundation is compacted, the pavement structures are laid, and C20 concrete, a steel fiber reinforced concrete layer and C type steel are sequentially cast in situ at the connecting sections. According to the composite pavement structure for the urban down-traversing pavement and the construction method, the problems that a concrete pavement is prone to cracking and has multiple joints are effectively solved, the waterproof performance is good, and the flame retardant effect is good as well.

Description

technical field [0001] The invention relates to the field of road construction, in particular to a composite pavement structure and construction method for urban underpass roads. Background technique [0002] With the take-off of the world economy, all major economic countries in the world have accelerated the pace of road construction, and regard the establishment of a road network extending in all directions, smooth, convenient, comfortable and safe as the primary goal of promoting the rapid development of their own economy. However, limited land and space resources cannot meet the increasing traffic demand. In the middle and late 20th century, with the increasing maturity of shield tunneling technology, people began to focus on the development of underground space, and the number and length of road tunnels, especially the underpasses of urban trunk roads and expressways, continued to increase. [0003] At present, the following problems exist in the urban underpass road:...

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Problems solved by technology

[0003] At present, the following problems exist in the urban underpass road: 1) The traffic design code requires the tunnel pavement to adopt cement concrete pavement. Due to the dense structure of the concrete pavement pavement, the sound absorption coefficient is relatively low, and the noise pollution generated by vehicles driving on the cement concrete pavement is very serious , coupled with the rigidity of the concrete pavement, it is easy to crack and have many joints, resulting in poor driving comfort; 2) Ordinary asphalt pavement has the advantages of beautiful appearance and good driving comfort, but when a fire occurs in the tunnel, the asphalt currently in use The road surface will also be burned, and the large amount of toxic fumes emitted will directly threaten the safety of life; 3) Due to the high groundwater level of the underpass road section, the underpass tunnel is prone to water accumulation due to the low elevation in normal times or when it rains, and the concrete pavement is easy to age. Has a high coefficient of friction

[0004] The invention patent with the Chinese patent publication number CN101671991 discloses a paving method for the combined pavement layer of the tunnel pavement, which proposes laying the bottom bonding layer, the high rutting-resistant middle surface layer, and the waterproof and oil-proof bonding layer sequentially on the concrete layer And the upper layer of fire prevention, noise reduction and anti-slip, although it can solve the problems of fire prevention and noise reduction, due to the lack of reinforced structure, there are still cases of easy cracking and many joints, and there is no good solution for water accumulation

[0005] The utility model patent with the Chinese patent publication number CN203188083 discloses a non-slip tunnel pavement, which includes a continuous reinforced concrete base layer, a glass fiber geogrid layer, an asphalt mixed fabric layer and an anti-skid layer from low to high. Anti-skid, but it can't effectively solve the problem of waterproof and noise reduction

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