Recently, China Construction Installation undertook the construction
Nanjing Xianxin Road cross-river channel C3 standard general contracting project
Fully entering the peak period of construction,
At present, nearly 70% of the construction progress has been completed.
It is in the installation stage of cap beams, steel plate superimposed beams and other components.
As a key project of the national "14th Five-Year Plan" and
An important part of Nanjing's "high-speed highway system",
Xianxin Road crosses the river channel from the intersection of Kechuang Road in Qixia District in the south,
To the north along Xianxin Road across the Yangtze River,
After completion, it will help build a 10-minute cross-river fast channel.
Promote the cross-river integration of Jiangnan and Jiangbei,
Weaving dense Nanjing to support the river and develop a "transportation network".
The C3 bid section undertaken by Nanjing Company is located on the south bank of the Yangtze River.
Including 2.32 km of approach bridge and 2.86 km of at-grade road works.
Precise policy
Promote efficient construction
The Xianxin Road project is a follow-up to the reconstruction and expansion project of Nanjing 312 National Highway.
Another fully assembled bridge project.
Facing the high-voltage line crossing the construction site,
difficulties such as the difficulty of relocation and reform,
The project actively coordinates all parties to promote the relocation and improvement system;
Carry out construction planning meetings many times,
Continuously optimize the construction scheme affected by the high-voltage line;
Actively coordinate the construction along the line
street lights, signs and other municipal obstacles,
Adjust the position of the lifting beam and the erection beam to the east side,
Minimize the risk of operating under high-voltage lines;
In view of the problem of many intersections on the main road,
The project adopts sectional closure construction measures,
Reduce cross-cutting with social vehicles and reduce safety risks,
Achieve rapid progress in engineering.
Due to the lag in the relocation and reform of the chemical pipe gallery in the early stage,
Severely restricting the node goal of the left width penetration,
The project team optimized the way the foundation was reinforced
Adjust to the piling process of manual digging and mechanical drilling,
On the premise of ensuring the normal ventilation of the chemical pipe gallery pipeline,
Through safety measures such as bracket erection, protective isolation, etc.,
Successfully completed the construction of pile foundation, cushion cap and other substructures.
The connection between the project and the Wulongshan Tunnel belongs to the high-fill roadbed.
Unable to implement the installation of conventional support cast-in-situ beams and prefabricated beams and slabs,
The project department optimizes the bridge superstructure through design
Adjust to the steel box girder jacking construction technology,
Successfully completed the 75-meter steel box girder jacking operation in the mountain section.
overcoming the rainy season during construction,
Problems such as limited construction environment, tight construction period and heavy tasks,
Realize the construction of the left steel box girder pushing down frame in the mountain section as scheduled,
Ensure that the main line is connected and provide construction roads.
Wisdom empowers
Innovative lean construction
The main line bridge of the project adopts fully prefabricated and assembled construction.
The prefabrication and assembly rate of the whole project is 90%.
It is the first to be used in Jiangsu
The project of installation and construction of lightweight bridge components on the whole line,
The "three construction magic weapons" of the project help high-quality construction,
Set up a lightweight bridge component prefabrication factory,
Fine concrete batching plant and standardized steel processing plant
Centralized production at three sites,
Not only break through the limitations of traditional manufacturing sites,
It also shortens the transportation distance of large prefabricated components,
And the component is lighter than the traditional prefabricated component.
Compared with the traditional cast-in-place process construction,
The construction period is shortened by 30%-40%,
The number of on-site construction workers is reduced by 60%-75%,
Vigorously improve construction efficiency,
Independent research and development of "Rapid Installation and Construction Method of Steel Plate Laminated Beams"
Recognized by the provincial construction law.
In the face of the project's need for tens of thousands of cubic meters of prefabricated components,
How to achieve accurate and efficient "assembly"?
The project team fitted each bridge component
are printed with a QR code "ID card",
Including basic information, production process and installation information, etc.,
Workers only need to scan the code with their mobile phones,
You can analyze and learn and quickly carry out on-site work.
At the same time, the project team used BIM 3D simulation technology to
Optimize the construction of prefabricated components,
Before construction, each process and the standard layer are hoisted
Detailed simulation of each step,
Find possible construction collisions and optimize them,
Ensure that the hoisting process is scientific and orderly,
Component assembly is fast and accurate.
Security escort
Cohesion quality construction
The project team adheres to the double line of defense of "safety + quality".
Escort the safe and efficient construction of the project.
In terms of quality construction,
Adhere to full participation and whole-process control,
Establishment of 11 test function rooms,
It has 69 detection functions in 11 categories,
Keep an eye on the quality of incoming materials,
Implement the whole process of finished product testing,
Comprehensive control of the quality of engineering construction.
At the same time, the quality of the three inspections, the actual measurement of the actual quantity on a regular basis, etc.,
Establish a model guide, process inspection and acceptance,
Side-station supervision and finished product protection,
concrete strength early warning system,
Ensure that the quality of the project is excellent at the first time.
CSCEC Installation is the main participating unit
It was awarded the "Jiangsu Provincial Highway and Water Transport Safety Centennial Quality Project".
In terms of security control,
Strictly implement monthly, weekly and daily inspections,
Application of China Building Smart Security Platform,
Nanjing Public Works Construction Center and other APPs,
Multi-party linkage to establish a "dual platform" for security management and control,
Build an intelligent security management model;
In the case of a lot of hoisting operations in the project,
The project is always accepted in accordance with the safety conditions before hoisting.
The "hoisting order" is issued, and the hoisting experts check the site
Safety officer on-site supervision, supervision of side stations and other procedures,
Realize the safety control of the whole process of hoisting prefabricated components,
Ensure the safety of hoisting all kinds of components.
Since the start of construction, the project has achieved "zero accidents" in safe production.
Awarded "Jiangsu Provincial Safe Construction Site",
Enhance the ability to perform the contract with the hard power of safe production.