The complex building supporting the parking lot is a class I high-rise civil building, with a building area of about 26000 square meters and a height of 57.1 meters, including 12 floors above the ground and 1 floor underground, which is responsible for the initial and terminal bus stations, subway traffic connection space, subway maintenance and operation building and other functions in the future.

During the construction process, the subway constructors of China Railway 14th Bureau, the construction unit, have continued to explore innovation and overcome various construction problems by introducing new technologies.

In order to solve the problem of cross construction and improve the construction efficiency, Chentougang parking lot took the lead in applying the “assembly type” construction technology in the throat area construction.

Following the successful capping of Qifu Station, the first station of the whole line, Guangzhou Metro Line 22, with a design speed of 160km/h, has once again ushered in new progress! Recently, after more than 600 days of continuous construction by subway builders, the cover plate of Chentougang parking lot and the comprehensive building were successfully capped, marking that the project is about to enter the electromechanical construction stage.

While ensuring the construction progress, it reduces the on-site labor force, saves the construction site, and greatly improves the construction safety and quality.

Guangzhou Metro introduced that in the subsequent construction, the subway builders will also promote the application of BIM technology in the secondary structure and decoration to further improve the construction level.

Guangzhou Metro Group introduced that the throat cover plate of Chentougang parking lot is the first assembled construction project in Guangzhou metro depot (yard).

During the construction of pile foundation, subway builders innovatively applied new drilling pile mud circulation and filter pressing treatment equipment to realize the harmless treatment of pile foundation waste mud through the separation of solid and liquid materials.

Building an “innovation workshop” in the parking lot is facing challenges such as large project construction scale, tight schedule tasks, and high pressure on safety management and control.

The steel structure in throat area is mainly composed of 215 steel pipe columns, 192 U-shaped beams and 683 H-shaped steel beams.

Chentougang parking lot is located at the junction of Dongxin Expressway in Panyu District and Nanda Trunk Line.

The “core filled steel pipe column+new U-shaped beam+composite plate assembly structure” is adopted.

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“Assembled” construction solves construction problems.

From south to north, it is respectively the warehouse area, throat area, entrance and exit lines and U-shaped grooves.

Ferrule Insert

The throat area of Chentougang parking lot is 191.4 meters long, 130.3 meters wide at the widest part, 88.5 meters narrow at the narrowest part, and the height of the main building is 9.5 meters.

Source | Construction Enterprise Headquarters Document | Chen Huhui, Huang Shuan, Editor | Tan Yingjian..

Due to the large construction volume of the parking lot, and in the construction process, there are intersections between processes and disciplines.

In the construction of U-shaped groove enclosure structure in the parking lot, the subway builders used the long spiral pressure grouting pile technology for the first time, which greatly accelerated the construction progress and saved 20% of the construction period compared with the traditional rotary drilling drilling method.

Up to now, 37% of the civil works of Line 22 have been completed; Of the 8 stations, 4 are under civil construction, and the other 4 are under preliminary preparation; Civil construction is carried out in 3 of the 7 sections, and preliminary preparation is carried out for the rest.

The total area of the parking lot covers more than 110000 square meters.

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It is equipped with 20 parking and inspection lines, 2 weekly and monthly inspection lines, 1 temporary repair line, 1 wheel turning line and 1 testing line.

At the same time, 1448 ribbed comb laminated plates with a single weight of 2.8t were used.

The main structural members of the building shall be cast in the precast beam yard or processing plant and then transported to the construction site for assembly.