Metro Line 12 realizes two tunnels to penetrate the progress of the progress of the construction line

Photo by Wang Qiang, the tunnel of the right line of Tangnan Division

Recently, the right -line tunnel of the Guangzhou Metro Line 12 to China Southern Airlines (hereinafter referred to as the "Tangnan Division") was successfully connected, marking the successful convergence of the two -cave area shields and excavation construction risks. Realize the two -line interval tunnel. In addition, the "Qianjin No. 3" shield machine was unearthed in the secondary work area of ​​Mingwei Emperor Worgle District, the outer ring road of the University Town of Panyu District, marking the tunnel of the left line of the entry and exit range of the university city of the university.

See the hole rate of 70 %! First use variable density dual -mold shield

The right line of Tangnan range is about 728 meters, and more than 80%of them are located in the radius of a small curve of 350 meters, and the stratigraphy caves are developing strongly, with a cave rate of 75.2%. In order to cope with complex mutations, the landslide -soluble strata and ensure the safety of the construction of the subway tunnel, the project technology team of the Guangzhou Metro and the construction unit of the CCCC Tunnel Bureau applied the variable density (mud/soil pressure) dual -mold shield machine in the project for the first time. The shield machine has a diameter of 6.7 meters, and the total length of the shield machine is about 112 meters. By equipped with a pussy canal can be injected into high -viscosity pussy soil mud in the process of promotion in the shield machine to achieve the effect of changing the density of mud warehouses, ensuring stable pressure in the mud warehouse, and ensuring the safety of soil pressure and mud water mode. At the same time, compared with the conventional mud water shield machine, the shield machine's soil pressure/mud water mode shares the spiral machine for dangers/pulp work, avoiding the stagnation of the mud warehouse mud in the mud shield machine, which greatly improves the shield structure. Safety and efficiency of construction.

In order to cope with complex geological conditions, the subway builders before the construction carried out the cave exploration hole and the filling of the cave. In addition to the routine drilling test of the routine cave treatment, the cross -hole CT and the transient electromagnetic method were used to conduct individual sensitive areas for individual sensitive areas. Geological scan detection effectively guarantees the stability of the rock -soluble formation.

Photo by Wang Qiang, the right -line shield of Tangnan Division

Light -covering soil and small radius multiple challenges! Superb skills to resolve high risks

The left tunnel of the entry and exit range of the University Town South Parking Line is 815 meters long. During the excavation process, the shield machine has passed through the West Ring West Road and the Scenic Area Gate of the University Town, and the tunnel is near the existing existing Line No. 4 University Town to Xinming. Division, communication iron tower, residential building and other facilities and buildings.

In addition to the complex ground construction conditions, the shield machine is also difficult to dig in underground. According to the construction plan, the minimum turning radius of the shield machine in the "forward 3" shield machine is 309 meters in tunnel construction. When the shield machine is dug on the small turning radius line, the pressure difference between the left and right sides is large. Shift to the outer side of the curve. In addition, when the shield machine is wearing the ticket hall and gate of the scenic spot, the stratum is a soft rock strata, a hard rock layer, and a soft and down hard strata alternately. There are large slopes and shallow soil in the interval lines, all of which have high requirements for shield digging parameters control.

Faced with the various technical difficulties encountered during the shield excavation process, in order to reduce construction risks and ensure the successful completion of various nodes in the shield, the Guangzhou Metro and the construction unit of the China Communications Fourth Airlines Bureau's comprehensive follow -up monitoring of the shield machine implementation system system , Promoting information construction, by setting up tube internal forces and deformation monitoring in the tunnel, setting 600 mm thick concrete mid -part wall, reducing the mutual impact of the left and right tunnel construction, effectively solving the small possibility of the line spacing may bring. Shield excavation "sequelae". At the same time, the technicians continuously optimize the excavation scheme and excavation parameters according to the data of the shield digging process. For the problem of the full section of the hard rock segment before entering the shallow soil section, the knife is replaced in advance to avoid the risk of changing the knife in the shallow land segment. It has also improved the efficiency of excavation. It is reported that after the "forward 3" shield machine is out of the hole, it will return to the starting point and continue to take the excavation task of the right line tunnel in and out of the field.

As of now, the Citizenship Project of Metro Line 12 (Yifenggang-University Town) has completed a total of 50%. Among the 25 stations, 9 main structures were capped, 15 were under construction, and 1 preparation was carried out in 1 section. Of the 24 sections, 5 sections were connected, and the construction of civil construction was carried out. The remaining 8 were prepared before construction. The section and entry and exit section of the head, the South parking lot of the university town and the entry and exit line for civil construction. The rail engineering is under construction.

The rest of the progress of the subway line under construction is updated

Line 3 Dongyan section (Panyu Plaza-Sea Piece): 76%of the Civil Construction Project has been completed. Of the four stations, 3 were capped, and one of the remaining one was carried out for civil construction; 3 of the four sections had been connected, and the remaining one and the entry and exit lines were performed for civil construction. The construction of civil construction in Guangzhou New Town. The rail engineering is under construction.

Dongyan section 5 (Wenchong-Huangpu Passenger Transport Port): Cumulative 72%of the civil engineering project. Among the 6 stations on the entire line, 4 stations have been capped and started mechanical and electrical construction, and the remaining two are carried out in civil construction; two of the 6 areas have been connected, 4 are carried out in civil construction; Essence

Phase II (University Town South-Northwest): A total of 81%of the civil engineering project was completed. Among the 11 stations, six have been capped and started mechanical and electrical construction, and 5 of them are carried out in civil construction. Of the 11 sections, 9 have been connected, and 2 and the entry and exit sections are carried out for civil construction. The Jiotang parking lot is carried out in civil construction.

Line 10 (Xiyi-Shipai Bridge): 52%of the civil construction project has been completed. Among the 14 stations, 5 are capped, 8 are construction of civil construction, and 1 of the remaining 1 are prepared; 3 of the 14 areas have been connected, and 6 and the entry -exit section lines are carried out for civil construction. The remaining preparations are carried out. The construction of the vehicle section of the Guangsteel New Town is carried out in civil construction. Line 11 (Railway Station-Pazhou-Railway Station): A total of 84%of the civil construction projects across the line. Of the 32 stations, 2 have been opened, 14 have been capped, 15 are under construction, and 1 of the remaining one is prepared in the preliminary preparation. One of the 32 interval has been built and opened. Construction, the remaining one is prepared before construction. The construction of the Chisha vehicle section and the entry and exit section is carried out for civil construction. The three stations started the station decoration and mechanical and electrical installation construction.

Phase II (Chaoyang-Fish Bead): Cumulative 54%of the civil engineering projects. Among the 23 stations, 7 are capped, 15 are planned for civil construction, and 1 stations are prepared for preliminary preparations. Among the 23 areas, the six areas and the entry and exit lines of the Phoenix parking lot have been connected. Fish Parking Lot, Phoenix Parking Lot and Cover for civil construction.

Phase II (Jiahe Wanggang-Guangzhou Railway Station): 38%of the civil engineering projects. Among the eight stations, the four main structures were capped, two were construction in civil construction, and the remaining 2 were prepared for preliminary preparations. Of the 8 sections, 3 had been connected, 4 were carried out in civil construction, and the remaining one was prepared for preliminary preparations.

The rear section of Line 18 (村--Guangzhou East Station): 14%of the civil engineering project has been completed. The construction of civil construction in the east to the village of Guangzhou.

Line 22 (Chen Tougang-Fangcun): A total of 24%of the civil construction project was completed. Four stations are undergoing civil construction; one of the four sections is carried out in civil construction, and the remaining 3 are prepared for preliminary preparations. (Text: Chen Huhui Cai Chujie Zhu Yu)

(Note: The name of the above stations is only the tentative of the project, and the standard station name shall be based on the approval of the municipal government.)

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