Two are over 13 meters in diameter.、130-meter-long shield machine，Like a giant dragon digging at the bottom of the Pearl River Estuary！October 9，Shenzhen-Jiangmen High-speed Railway(Hereinafter referred to as Shenjiang Railway)Construction of the whole line started，Nandu reporters interviewed and learned，By the end of September 2022，Shenjiang Railway Kailei Completed Investment 18.8.7 billion yuan，Of the total budget 457.4 of 1.1 billion yuan.13%。Zhujiangkou Tunnel is the first section of Shenjiang Railway.，Commencement in July 2020，By“Big Bay area code”And“Shenjiang No.1”Two shield machines are digging on the seabed.，At present, 1980 meters have been excavated.。

The Shenjiang Railway is China's“Eight vertical and eight horizontal”An important part of the coastal corridor of the high-speed rail network，Led from Xili Station of Shenzhen Hub，Westward through Baoan, Shenzhen、Binhai Bay, Dongguan、Nansha, Guangzhou、Zhongshan、Jiangmen，Introduction to Jiangmen Station of Shenzhen-Maoming Railway，Docking with Jiangmen-Zhanjiang Railway。

After the completion and opening of the Shenjiang Railway，The coastal passage will be further opened.，By then, Jiangmen and Shenzhen will be accessible within one hour.，Further opening up the coastal high-speed railway channel，Help build a half-hour life circle in Guangdong-Hong Kong-Macao Greater Bay Area、Economic Circle，Radiation drives the coordinated development of eastern Guangdong, western Guangdong and the Pearl River Delta region。

Construction progress

Completed investment of the project: 18.8.7 billion yuan

Recently，Nandu reporter learned from Jiangmen Engineering Construction Command of China Railway Guangzhou Bureau Group Co., Ltd.，The total length of the main line of Shenjiang Railway is 116.31 kilometers，Of which the bridge 69.Three kilometers，Tunnel 45.0 km(Including the length of underground station)，Bridge and tunnel ratio 98.3%，Shi Xili、Shenzhen Airport East、Binhai Bay, Dongguan、Nansha、North of Zhongshan、Bar、There are 7 stations in Jiangmen，Design speed 250 km/Hour(200 km from Xili to Nansha/Hour)，Total construction period 5.5 years(Excluding the first section of the Pearl River Estuary Tunnel)。

、Image source：Guangzhou railway official micro

、The relevant responsible person of the command introduced.，Through the joint efforts of all parties，State Railway Group、Guangdong Provincial People's Government approved the preliminary design of the whole line on September 3, 2022.，Online bidding will be launched on September 8.，Construction of the whole line started on October 9.。As the first construction section of Shenjiang Railway，The total length of Zhujiangkou Tunnel is 13.69kMeters，Commencement in July 2020，The civil construction period is 56 months.。

、General Layout of Zhujiang Estuary Tunnel Project。Map provided by Jiangmen Engineering Construction Headquarters of China Railway Guangzhou Bureau Group

、The Pearl River Estuary Tunnel Project of Shenjiang Railway is located in Dongguan、The mouth of the Pearl River between Guangzhou，Including open cut section、Shield tunnel、Mine tunnel and inclined shaft, etc.。October tenth，Chen Xingfei, chief engineer of the Pearl River Estuary Tunnel Project of the 14th Bureau of China Railway, told Nandu reporters.，At present, Humen、Nansha Island、There are more than 600 managers and workers in the three construction sites of Wanqingsha.，According to the requirements of epidemic prevention and control work，Strict closed management is implemented on the construction site.，Adequate material reserves，Uarantee continuous construction。At present, there are two shield machines in Humen and Wanqingsha.，Driving in opposite directions at a speed of more than 10 meters per day。

、According to the above-mentioned people,，By the end of September 2022，Shenjiang Railway Kailei Completed Investment 18.8.7 billion yuan，Of the total budget 457.4 of 1.1 billion yuan.13%。Construction progress，The open-cut section of the Pearl River Estuary Tunnel Project has completed 980 meters.，Accounting for 59% of the total length of 1650m.39%；1980 meters of shield tunneling，Accounting for about 30% of the total length of 6520 meters.37%；The inclined shaft of the mine section is about 650 meters.，Accounting for about 56% of the total length of 1160 meters.03%，The main tunnel of the mine section is 5,520m long.，Construction has not yet started.。

Construction highlightsA

Underwater tunnel with the largest buried depth and the largest water pressure in China

According to introduction，Adopted by scientific research team“Mine+Shield”Combined Construction Method for Crossing Tunnel。Mining method，That is to say, the tunnel is built by excavating underground tunnels.；Shield method，That is to say, large shield machine is used for tunneling construction.。Relevant persons in charge of Jiangmen Engineering Construction Command of China Railway Guangzhou Bureau Group Co., Ltd.，The Pearl River Estuary Tunnel Project has four characteristic。

First, the length of the tunnel crossing the water area is about 11kMeters，It is the longest underwater tunnel in China.。The maximum underwater burial depth is 106 meters.，Water pressure of shield section 1.06 MPa。Construction at maximum buried depth，1.What is the concept of 06 MPa water pressure?？Chen Xingfei made an analogy.，“Equivalent to the area of the fingernail of an adult's thumb，Bear the weight of 10 kilograms of rice”。

Second, the middle section of the tunnel is a mine tunnel with a total length of 5490 meters.，The mining method is adopted to construct the maximum underwater buried depth of 115 meters.，It is the largest burial depth in China at present.、Underwater tunnel with maximum water pressure。Construction by mining method under high water pressure，It is more difficult to prevent and control inrush through fault fracture zone、The selection of structural stress and waterproof and drainage measures is more complex.。

、Third, the shield tunnel passes through the whole section of hard rock for a long distance.，Local rock strength up to 200 MPa，Crossing two fault fracture zones at the same time，Length up to 1.24kMeters。Replacement of Worn Cutting Tools of Shield Machine in Unfavorable Geological Section under High Water Pressure，The difficulty can be imagined。When excavating a very high-risk section，The shield machine will be equipped with advanced geological exploration means.，Prediction and analysis of the front formation，Realize one machine with multiple functions。Remove the problem of tool change under water，Another major difficulty is how the shield machine is received and dismantled in the sea.。Chen Xingfei said，In this case，After the shield machine completes the tunneling task,，Disintegrate in situ in the tunnel，And ensure the intact rate of the shield machine，This construction method is the first in China.，It is a new challenge for disassembly and transportation.。

Fourth, the mine tunnel is 250 meters long through the fault underwater.，Seven secondary fault zones are 140 meters long.，Intrusion of 2 weathering troughs，There is no similar engineering experience of underwater fault fracture zone treatment under high water pressure in China.。

Construction highlightsB

The two most important weapons of the country are dug in opposite directions from the seabed.

“There is Shenzhou in the sky，There is a shield into the ground”，The domestic shield machine has become“Chinese business card”。The appearance of the two shield machines participating in the construction of the Pearl River Estuary Tunnel is quite distinctive.。“Shenjiang No.1”Wearing clothes“Awakening Lion”Skin，Magnificent，It has a great sense of hierarchy，Highlight the regional cultural characteristics of Guangdong；Big Bay area code“Spraying”Jiaolong“Modeling，It means this one”The underground dragon braved the wind and waves.、There is no disadvantage。

The total length of the shield section of Zhujiangkou Tunnel is 6520 meters.，Among，“Shenjiang No.1”The shield machine excavated 3590 meters from the direction of Humen, Dongguan.，“Big Bay area code”The shield machine excavated 2930 meters from the direction of Wanqingsha, Nansha District, Guangzhou.。

Chen Xingfei introduced，The cost of the two shield machines is about 2.800 million yuan。Among，“Shenjiang No.1”The shield machine is 130 meters long.，Total weight 3800 tons，Excavation diameter 13.42 meters，Dig through Humen，The maximum underwater depth of the shield section is 106 meters.；“Big Bay area code”The total length is 133 meters，The total weight is 3900 tons，Excavation diameter 13.32 meters，Dig from Wanqingsha，The maximum underwater buried depth of the shield section is more than 90 meters.。

Chen Xingfei said，By the end of September，The shield sections in both directions have been excavated for 1980 meters.，Accounting for about 30% of the total length of 6520 meters.37%。