Recently，Have“The first bridge in South China”Guangzhou Pearl River Huangpu Bridge with good reputation，Sectional continuous flow construction，With minimal impact on existing traffic，Reconstruct the pavement。
Adhering to energy conservation and environmental protection、Green Cycle、The Scientific Concept of Low Carbon Development，Guangzhou Highway Engineering Group Co., Ltd., the construction party, has frequent highlights in the bridge deck reconstruction project.，Actively explore and utilize“Four new technologies”，Improve efficiency、Very short construction window for each section of construction，Improving Quality to Realize the Task of Improving Quality of Bridge Deck Road。
“Four new technologies”Overcome project challenges
Huangpu Bridge is a bridge connecting Huangpu District and Panyu District in Guangzhou City, Guangdong Province, China.，An important channel across the Pearl River，It is an integral part of Guangzhou-Macao Expressway.，It is also a part of the East Ring Section of Guangzhou Ring Expressway.，Its importance in urban traffic network can be imagined.。
Since its completion and operation in 2008，Has been carrying a huge amount of traffic.。In order to ensure good traffic performance and service life of the bridge pavement,，At the end of 2022, Guangzhou Highway Engineering Group Co., Ltd. undertook the construction task of Huangpu Bridge deck reconstruction project.。
The whole Huangpu Bridge has a total length of 18.694 kilometers，Total length of main bridge section is about 7.01 65 km。For the construction side, the first challenge is the huge traffic flow on the bridge deck.、It is necessary to minimize the impact on the existing traffic conditions of the bridge deck.， As a result The construction window is shortAt the same time, the construction occupies less traffic area.。
In addition，Different from the conventional road surface reconstruction task，Quality control of bridge deck reconstruction is also faced withAmbient temperature is low、Rapid temperature dissipation of asphalt material caused by high wind speed on bridge deck、Difficult temperature control of paving and compactionMultiple construction challenges。
Founded in 1984，Guangzhou Highway Engineering Group Co., Ltd., which has strong strength and rich experience in the construction field, has received the construction task.，After preliminary investigation、After a full demonstration，The construction scheme of multiple working faces in sections is adopted.，The new technology of advanced Fogler synchronous spraying thin layer paving technology is introduced to cooperate with the new technology of Hummer oscillation compaction.，O as to simplify the construction process.、Improve construction efficiency and safety，Meet the requirements of shorter construction window，Minimize the impact of construction on traffic as much as possible.
At the same time, careful material supply、Under the transportation plan and construction arrangement，Bridge deck modified asphalt new material through new technology、Paving and compaction with new technology，Olves the problem that the temperature of the modified asphalt material is difficult to control，It fully meets the strict requirements of construction technical indicators.，And ensure that high quality of construction.。
This time，New technology、New Technology、New equipment、New materials, etc“Four new technologies”Successful application of，Resource saving is realized.、Build low-carbon transportation，It provides a new reference example for the selection of construction scheme of pavement reconstruction of such large bridges.。
Synchronous spraying and thin layer paving technology Simplified process, high efficiency and high quality
To reduce the impact on road traffic，The construction party has adopted the method of sectional construction of multiple working faces.。At each working face construction stage，The construction party shall treat the diseases of the lower bearing layer in advance.，And through the Wittgen large Milling Machine and small Milling Machine W 50 HR Pre-milling the area to be resurfaced。
W 50 HR Miniature Milling Machine body is small in size，It can be flexibly milled and constructed within the limited space of a single lane.，Intelligent and precise control，After milling, the flatness of the working face is further improved.，Finely milled texture helps improve adhesion，The combination effect of the paved new surface layer and the original structural layer will be better.。
After milling pretreatment，Fogler by Equipped Spray Module SUPER 1800-3 SprayJet Paver adopts synchronous spraying thin layer paving technology.，Paving 4 cm Lower layer，Lay 2 on it again cm Ultra-thin Asphalt Wearing Course。
Because a single device can realize the synchronous implementation of the step of spraying the adhesive layer oil and the paving process,，Thereby simplifying the process.，Construction organization is more convenient。In addition, the equipment can precisely control the spraying amount of modified emulsified asphalt according to the design requirements.，And ensure that the sprayed tack coat will not be damaged or polluted before paving the asphalt mixture.，Thereby ensuring the reliable bonding effect between the lower surface layer and the original structural layer.。
The bridge deck uses a new type of high toughness modified asphalt material.，In order to achieve the ideal construction quality，The temperature required for spreading shall be higher than that of ordinary bituminous material，Need no less than 180℃ 。Therefore, the new asphalt material should not only ensure the control of temperature dissipation during transportation,，Moreover, after arriving at the site, it is more necessary to pave quickly.。
This time, the Fogler synchronous spraying thin layer Paver is used.，Powerful paving capability achieved 10 m/min Paving efficiency，Add Vogler intelligent control screed electric heating technology，These effectively ensure the temperature of the material during spreading.，Good paving quality is guaranteed.。In addition，With Vogler's advanced cross slope automatic control system and high-precision screed system，An extremely high degree of flatness is also achieved when paving.。According to manager Chen, the person in charge of the construction site.：
The application of the tack coat oil and the spreading of the asphalt material are carried out simultaneously, so that the adhesion of the paving layer material is better.。Moreover, unlike ordinary pavement, steel bridge deck has multiple layers of base material as temperature regulation layer.，Therefore, the steel bridge is more sensitive to the change of ambient temperature.。
The temperature adaptability of this ultra-thin overlay is also better.。Compared with traditional pavement paving，The ultra-thin paving process based on synchronous spraying on the steel deck can make the deck pavement more durable.。
New equipment for vibratory compaction Take multiple measures to improve quality
Ultra-thin paving process based on synchronous spraying，After spreading of bituminous material，Same as regular road construction，It also needs to be compacted by a roller to form the pavement at one time.。
The difference is，Steel deck is very sensitive to resonance，Therefore, it is necessary to minimize the adverse effects of vibration on the bridge body and the threat to the traffic safety of adjacent lanes.，But also ensure the high efficiency of compaction.，Ensure that the deck material is compacted within the required temperature range。
Final，The construction side has adopted the latest double-wheel model of Hummer with oscillating compaction function. HD 138i VO Take on a heavy responsibility。Oscillatory compaction technology is the only dynamic compaction system that can be used in vibration sensitive areas such as bridges.，Previously, the Hummer oscillating roller was used on the Hong Kong-Zhuhai-Macao Bridge.、Humen Bridge、It has been successfully applied in the deck construction of many super bridges such as Shanghai-Nantong Bridge.。
During compaction，The oscillating drum does not lift off the ground，So that that steel wheel can be prevent from vertically impacting the ground，Ensure that the surrounding area is not affected by resonance。In fact，Only part of the lane was closed during the construction.，Traffic in the side lane and the opposite lane is still flowing.。
The application range of oscillatory compaction technology to material temperature is wider.，For the bridge deck area due to wind speed、The environmental factors such as temperature and humidity lead to the characteristics of fast asphalt temperature dissipation.，Ven if the asphalt temperature is low，Thin layer cooling too fast，It can also be compacted efficiently.。
This construction，Oscillating compaction plus static pressure for 2 times，Field measurements fully meet the final 98%Compaction requirements
Manager Chen introduced.。
In addition, the Hummer is used in the construction. HD 138i VO Model，It is also a new model of the fourth country that meets higher emission standards.，Available at 25-60 Hz Flexible setting according to the characteristics of the compacted material，Compaction of the middle and upper layers can also be accomplished at higher speeds by the optimized high vibration frequency。
At the same time, the equipment also has the function of compaction constant speed cruise.、Preset Maximum Travel Speed、Slow start and stop、A series of automatic intelligent functions such as automatic vibration，This allows the compaction process to be stable at all times，Not only the compactness is high，And that compaction is more uniform.，Help the construction party to achieve the ideal compaction quality。
Low carbon and energy saving Green maintenance
The construction of this project has not only successfully achieved the good effect of bridge deck reconstruction and upgrading, but also achieved the good effect of bridge deck reconstruction and upgrading.，The construction party has taken many measures such as improving the construction technology.，Strive to save resources in the whole construction process，Reduce carbon emissions，Reduce impact on the environment，Practice the goal of building green transportation。
Thin-layer paving process used in the project，The thickness of asphalt layer is smaller than that of ordinary asphalt layer.，More material saving，And Vogler Super 1800-3 SJ Integrating the concept of energy conservation and environmental protection，And equipped with Vogler's proprietary EcoPlus Low emission package，The oil-saving effect is obvious，Plus the fourth national Hummer Road Roller model that meets lower emission standards，Further reduce construction energy consumption and reduce carbon emissions.。Manager Chen, who is in charge of the construction site, said proudly.：
Compare to conventional wearing course，The high-toughness ultra-thin wearing course laid this time has excellent crack resistance.、Impermeability and skid resistance，The paving flatness is very good.。
We are the backbone model construction enterprise based in Guangzhou.，I am glad to be able to live up to expectations in the reconstruction of the bridge deck.，Maintain the quality standard，In order to improve the safety and comfort of citizens in the process of driving, a satisfactory answer was handed in.。
List of construction sites
Length of construction road：18.694 km
Construction area：45000 m²
Paving width：3.75 m
Paving thickness：The lower layer 4 cm+Upper layer 2 cm
Use the main equipment
Wirtgen small milling machine W 50 HR*1
Wirtgen large milling machine W 2000*1
Vogler Paver Super 1800-3 SprayJet*1
Hummer Oscillating Double Steel Wheels HD 138i VO*2
