盾构到达米埔竖井出洞方案20150725Plan of TBM breaking through(2)

广深港高铁深港连接隧道盾构出洞方案

above the position of both machines breaking through, so TBM cannot be lifted out directly, it must be moved to lifting point in the center of shaft, the dimension of shaft is18*9m. The wall of shaft is glass fiber re-bars concrete with a thick of 1.0m, the inner wall of portal is not in construction now, with a thick of 2.0m. The current design elevation of shaft base plate is -29.63, which away from the bottom of TBM 1.354m, there are two group concrete footsteps and reserved steel cage in the center of lifting shaft. Show in the figure as below.

图2 米埔竖井端头 Figure 2 The end of Mai Po shaft

1.3工程地质及水文条件 Engineering geological and hydrological conditions

米埔竖井出洞段土层分布如下图，自上而下依次为人工填土、海洋沉积、冲积层、强风化变质砂岩。盾构出洞土层具有含水量高、孔隙比大和强度低等特点，给盾构出洞带来不利的影响。

The ground distribution of TBM breaking through section in Mai Po shaft show in the figure below, it is artificial soil, marine sediments, alluvial soil and strongly weathered metamorphic sandstone from top to bottom. Ground characters such as high water content of soil, big void ratio, and low intensity and so on will bring adversely influence to TBM when it breaks through.

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广深港高铁深港连接隧道盾构出洞方案

出洞段地质情况 Geological condition of TBM out from tunnel 地层厚度（m） 地层 Ground Thick 填土 Artificial soil 海洋沉积 Marine sediments 冲积层 Alluvial soil 强风华变质砂岩 Strongly weathered metamorphic sandstone 埋深 Depth 4.38 0.38 8.71 9.74 23.21 图3 盾构出洞土层分布图 Ground distribution map of TBM breaking through

2 总体达到施工方案 The overall arrival construction plan

根据出洞段地质情况及米埔竖井结构情况，盾构出洞采用高压旋喷桩加固端头地层，盾构机直接切削玻璃纤维混凝土连续墙，破入墙内40cm后，将舱内泥水压力降至0bar，排出舱内泥浆，保持常压出洞。竖井内采用预埋钢板固定箱型钢导梁，钢导梁上设置钢结构接收托架，盾构机爬上托架后，利用导梁上的千斤顶横向平移，盾构机平移至中间吊出井，拆解盾构机分块吊出。

According to the geological conditions and structure of Mai Po shaft, high pressure rotary jet grouting pile will be used to reinforce end formation when TBM out from tunnel. TBM directly cutting glass fiber re-bars concrete wall, turn the slurry pressure down to 0 bar in excavation chamber after break into the wall 40cm, discharging all slurry outside and keep TBM breaking though with 0 bar pressure. Using embedded steel plate in shaft to fix box steel guide beam, steel structure receiving bracket should be set on steel guide beam. After TBM climb to bracket, the jack on guide beam lateral transition, transfer TBM to the middle of shaft, then dismantle it and lift outside one by one.

盾构机到达前，首先进行接收井端头土体高压旋喷加固，然后进行洞门加固的渗透检测，以及竖井底板内预埋钢板用以固定箱型平移梁，浇筑一层混凝土。盾构机到达

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广深港高铁深港连接隧道盾构出洞方案

出洞段50m推进的同时，开展贯通测量、调整盾构机姿态及线形控制，盾构机到达前完成洞门加固的渗透检测。盾构机出洞前要做好管片的止水防护措施，同时做好同步注浆工作，确保建筑间隙填充饱满。盾构机破出连续墙后，清理竖井底板切削下来的大体积混凝土块及碎石，然后进行箱型平移梁及接收托架安装固定。

Before TBM arrived, the high pressure rotary jet grouting pile of receiving shaft should be reinforced at first, then start portal reinforcement penetration test, fix steel box guide beam with steel plate embedded in shaft base plate, and pouring a layer of concrete. When TBM arrive the 50m breaking through section, measurement, TBM posture and alignment adjustment control should start when advance, the portal reinforcement penetration test must finish before TBM arrived the end of tunnel. Waterproof measures of segments should be done well before TBM break through as well as grouting, to ensure filling the gap of construction. After TBM break out from the continuous wall, cleaning massive concrete blocks and rubble cut down by shaft base plate, then install and fix box steel guide beam and receiving bracket.

3 盾构出洞施工技术Construction technology of TBM break through

3.1盾构出洞工艺流程Process of TBM break through

盾构机到达出洞施工是指从盾构机到达下一站接收井之前50m到盾构机贯通区间隧道进入接收井被推上盾构接收基座的整个施工过程（即盾构机到达米埔竖井前50m范围）。其工作内容包括：盾构机定位及接收洞门位置复核测量、地层加固、洞门处理、洞门渗漏检测、安装接收托架等。盾构到达施工流程图如《图4 盾构机出洞工艺流程》。

Construction of TBM arrival breaking through means the whole construction progress that TBM only 50m away from the next receiving shaft, it get through this section and reach receiving shaft, then be put on receiving bracket(TBM arrived 50m in front of Mai Po shaft). The job content include TBM location, receiving portal position check and measurement, ground reinforcement, portal handling, portal penetration test, receiving bracket installation and so on. TBM arrival construction flow chart is shown in figure 4(Process flow of TBM break through).

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广深港高铁深港连接隧道盾构出洞方案

盾构出洞过程中地层加固、洞门止水、同步注浆施工措施是保证开挖面土体稳定、减小对周边土体扰动、确保盾构出洞安全的关键施工技术。

When TBM break through, ground reinforcement, portal waterproof, grouting construction measures are guarantee to stabilize excavation face, decrease disturbance of ground around and the key to make sure TBM break through safely.

接收井端头地层加固 箱型轨道梁预埋钢板 洞门渗漏检测 渗漏钻孔填充注浆 盾构机爬上托架 接收托架安装固定 降压、排出舱内泥浆 盾构机平移 盾构机切削连续墙出洞 盾构机拆除吊装 清理竖井底混凝土块 箱型轨道梁安装固定

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广深港高铁深港连接隧道盾构出洞方案

Ground treatment for the top end ground at receiving shaft install and fix receiving bracket TBM clime up bracket TBM transition TBM disassembly and lifting pre-embedded steel plate for box track rail portal leakage inspection grouting for leaking drill holes-reduce pressure pump out the slurry inside the chamber TBM cut continuous wall and break through clean up concrete blocks at the bottom of shaft install and fix the box track beam 图4 盾构机出洞流程 Figure 4 Procedures of TBM break through

3.2盾构到达的准备工作PREPARE WORK BEFROE TBM ARRIVE

3.2.1 盾构机定位及接收洞门位置复核测量 TBM location and measurement check of receiving portal

在盾构推进至盾构到达范围时，联合港铁对盾构机的位置进行准确的测量，确定成洞隧道中心轴线与隧道设计中心轴线的关系，同时对接收洞门位置进行复核测量，确定盾构机的贯通姿态及掘进纠偏计划。在考虑盾构机的贯通姿态时注意两点：一是盾构机贯通时的中心轴线与隧道设计轴线的偏差，二是接收洞门位置的偏差。综合这些因素在隧道设计中心轴线的基础上进行适当调整。纠偏要逐步完成，每一环纠偏量不能过大。

When TBM advance to arrival section, cooperate with MTR measure the TBM position accurately, ensure the relation between finished tunnel central axis and designed tunnel central axis, start measurement check of receiving portal position at the same time, make sure the

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