Site facts

Susong, AnhuiSReconstruction of Highway 249

The project is located in Susong County, Anhui Province.S249 Beifu Road（Bamboo pier-Fuxing section），The road grade is the second-class highway.，Total length 24.2 kmOverhaul the road section，Two lanes in both directions。

01Project overview

This section is the main commuter trunk line from Susong County to Anqing City.，It has been more than ten years since it was built and opened to traffic，The original pavement is cement pavement.，Serious cracking caused by long-term commuting use、Pothole、Subsidence and other pavement diseases。In order to improve the road traffic condition，Improve the level of highway service，Most of these sections will be built on the existing subgradeWidened from 7 meters to 9 meters。

In order to completely repair the pavement,，Reduce traffic pressure，Resume traffic as soon as possible，Meanwhile, the construction cost is reduced，Demonstration of construction scheme，AdoptCan regenerate the whole lane at one timesYesXugongXLZ3805RCold recycledOverhaul of efficient cold in-place recycling technology。

 

Firstly, excavate the original cement pavement.，Re-broken，Reclaimed as cement stabilized macadam base course aggregate，The in-situ cold regeneration is carried out on the original bottom water-stabilized pavement and the recovered cement base macadam aggregate，By paving、Compaction，Forming water-stable base course，Final overlay 6cmAsphalt Subsurface Course and 4cmAsphalt upper surface course，Forming a final road surface。

02Construction equipment

 

The main construction equipment of this project includes XCMG cold recycling machine XLZ3805R ，One gravel distribution truck，One cement distributor truck，Two waterwheels，XCMG paverRP955TIVOne，XugongXS265JIVOne single-drum road roller，XugongXP305SIVOne rubber-tired roller，A loader，Two excavators。

03Construction steps

 

Because the construction section is the main traffic artery in the area.，Heavy traffic，Completely closed construction is not allowed，Therefore, traffic control was carried out on half of the road before construction.，Setting out according to road chainage and width。Sample the base course of the construction section before the project construction.，The mix proportion design of cement stabilized macadam cold recycling mixture is completed.。

 

During cold in-place regeneration of subbase，Graded macadam is pre-sprayed by gravel spreader in regeneration lane.，Then the cement spreader shall be arranged according to 4..5%Spreading shall be carried out according to the cement content；The mixing water consumption of the cold recycling machine is 2.8%，Construction speed of in-situ recycling machine is 4.5-6 m/min，Regeneration thickness is 20 cm，Milling width 3.5 meters，Paving width 4.6 meters。Compaction shall be carried out by XCMG road roller combination after paving.。First, use XCMG single-drum roller for static compaction.，Then weak vibration is carried out for 4 times.；Re-rolling: use XCMG rubber-tired roller to roll the 6-pass surface.。

04Engineering application summary
 

Based on synchronous pavingGreen construction technology of cold in-place recycling can be 100%Utilize local materials，Reduction in mining and use of road materials，And to the greatest extentAnd that construction cost is reduce，Beneficial to the development of local highway industry。

 

Cold in-place recycling construction based on synchronous pavingHigh degree of mechanization，Flexible construction，Little impact on driving。

6000 per day~8000㎡ Working face，High efficiency and energy saving，The construction period can be greatly shortened.。

At present，Cold in-place recycling technology based on synchronous paving has been used in Anqing, Anhui Province.、Huainan、It has been widely used in Huangshan and other places.。According to the detection data in the later stage of application，This technology is improving the quality of road maintenance.、It has a good advantage in improving traffic conditions.，Its social benefits、The economic benefits and environmental protection benefits are also well reflected.。