Successfully penetrate the high -speed rail, 53% of the second phase of Metro Line No. 13

Recently, the second phase of the Guangzhou Metro Line 13 of the Chaoyang to the Qingfeng range (hereinafter referred to as the "Chaoqing Division") tunnel and the horsescan station dark excavation platform tunnel all realized dual -line penetration. Luo Division ") The first dual -mold shield of the right tunnel started smoothly. As of now, the second phase of Metro Line 3 (Chaoyang-Fish Bead) has completed a total of 53%of the civil construction projects.

Only 4 hours in the morning construction

The left line of the Tunnel of the Chaqing Division is 2563 meters on the left, 2576 meters on the right, and a total length of 5,139 meters. It is the longest interval tunnel on the entire line. After the shield machine starts from Chaoyang Station, it is necessary to wear high -speed rail and many important constructive buildings and river surge, 4 underworld main water supply pipes for more than 2 meters, and finally reach Qingfeng Station. The interval tunnel vault is 6 meters to 16 meters, and the cave saw the cave rate is as high as 40%. The geological conditions within the excavation range are complicated, and the strata are soft and hard. The stance of the structure is difficult to control, and the knife and knife has severe wear.

The biggest challenge of the line is that the double line of the interval tunnel needs to penetrate high -speed railways. The high -speed railway is 350 kilometers per hour, with more than 200 trains per day. The construction sunroof period is only about 4 hours in the morning. The effective construction time is limited. At the same time, the edge of the tunnel is 4.5 meters away from the closest distance of the bridge pile, and the construction is extremely difficult.

Faced with many construction problems, the Guangzhou Metro and China Railway Six Bureau were established under the establishment of a tackling group to work closely with the railway department. Risk and technical problems. By adopting measures such as the full soil pressure excavation mode, controlling excavation parameters, adjusting the shield posture, encrypted monitoring frequency, and 24 hours of duty on duty, the settlement value is finally controlled within 2 mm.

Malaysca Station Dark excavation platform tunnel penetration

The Malaiming Station Dark Digging Platform Tunnel is located below the main road of Tianhe District. The tunnel is buried deep and large, the stratum is complex and varied, the construction process is frequent, the excavation is difficult, the safety risk is high, the construction period is high, the tunnel construction process is in the process of tunnel construction Water control, sinking, and disturbances are the difficulties of construction.

The China Railway Bureau of Guangzhou Metro and construction units has optimized the construction of the platform from the CRD method to a step method for the construction site in the construction site, and the large -scale interference of process interference. More compact, the exposure time of surrounding rocks is reduced, effectively reducing safety risks.

Dual -mode shield is officially "launched"

The right -line tunnel of Songluo range is 932.15 meters long, the minimum curve radius is 460 meters, and the maximum burial depth is 21 meters. The geological conditions in the interval are complicated. About 50%of the entire interval is the upper soft and down hard strata, and it is necessary to overcome the construction difficulties of receiving the shield machine in the sand section. It is one of the difficult "hard bones" in the entire line.

The interval excavation uses soil pressure/mud water dual -mold shield machine, which is difficult to control the shield machine. In order to prevent the shield spiral machine from surging and reduce the emergence of "mud cakes" in order to prevent the shield spiral machine from surging, China Railway Second Bureau invites experts to discuss the applicable selection of the shield machine, and Perform targeted improvements, improve the efficiency of shield tuning, and ensure that the construction plan is completed as scheduled.

As of now, the second phase of Metro Line 3 (Chaoyang-Fish Bead) has completed a total of 53%of the civil construction projects. Among the 23 stations, 5 are capped, 17 are planned for civil construction, and 1 stations are prepared for preliminary preparations. Among the 23 areas, 6 areas and the entry and exit lines of the Phoenix parking lot have been connected. Preparation for preliminary preparation. Fish Parking Lot, Phoenix Parking Lot and Cover for civil construction.

Wen, Tu/Guangzhou Daily · Xinhua City Reporter: Li Tianyan Correspondent: Deng Mengyuan Zhang Chenmu Jia Manfu He Zebin Guangzhou Daily · Xinhua City Editor: Long Chengliu

- END -