盾构到达米埔竖井出洞方案20150725Plan of TBM breaking through(4)

广深港高铁深港连接隧道盾构出洞方案

达到期望效果。

Water flow will be used to evaluate permeability coefficient K, if K value under 1*10-7m/s, means grouting can achieve desired effect.

如果经测试洞门注浆加固地层效果满足要求，则需要采用水泥浆（UCS=2.0MPa）对所有钻孔进行注浆回填封堵，封堵注浆流程如下。

If grouting meet the requirements of portal ground reinforcement through testing, all borings need to be filled with grout, the grouting plugging process is as following:（UCS=2.0MPa）.

安装封口器 将注浆管插入孔底开始注浆 当浆液反流至孔口时，持续注浆 30s以排气 端头墙封口器持压2min（压力保持在关闭闸阀 4~5bar）,压力高于水土压力的20﹪即可 注浆管出浆口

图10 封堵钻孔施工示意图

Figure 10 construction diagram for drilling holes plugging

3.2.4 出洞前竖井内准备工作 Preparation work in shaft before breaking through

目前米埔竖井底部靠中间吊装井有两道混凝土台阶，宽1.2m，高0.26m，另外有预留的钢筋笼，尺寸宽0.55m，高0.87m，竖井底板标高-29.63。如下图所示。

There are two group concrete footsteps in the middle lifting shaft of Mai Po shaft, the width is 1.2m and height is 0.26m, also reserved steel cage with a width of 0.55m and a height of 0.87m, the design elevation of shaft plate is -29.63. Show in the figure below.

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广深港高铁深港连接隧道盾构出洞方案

混凝土台阶钢筋笼钢筋笼混凝土台阶

图11 竖井底板结构图 Figure11 Structure chart of shaft baseplate 出洞前，竖井底部尚有如下工作需提前准备：

Before breaking through, work as below need to be prepared in advance at the bottom of shaft:

（1）考虑到底部平移钢箱梁、接收托架、滑块及预留尺寸，目前现有底板需进行临时填充，填充高度384mm，拟采用与825同标号的D30混凝土填充，底板标高设置与隧道一致的纵坡。

Considering bottom steel transition box girder, receiving bracket, sliding block and reserved dimension, the current baseplate need to be filled temporarily with a height of 384mm, plan to fill with D30 concrete same as 825, set a longitudinal slope consistent with tunnel at the elevation of baseplate.

?9900?95920090浇筑底板混凝土970-29.246-29.63原地面1填充细砂38429000

图12 竖井底板混凝土浇筑示意图

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广深港高铁深港连接隧道盾构出洞方案 2850285023502350（2）浇筑临时混凝土填充时，在底板预埋600×600×20mm厚钢板，用于焊接箱型轨道梁，达到固定箱形轨道梁的目的，预埋钢板根据箱型钢导梁的布置形式设置，具体见下图。 南行线 When pouring temporary concrete, embedded 600×600×20mm steel plate in the floor, which use for welding box girder and fix it. The arrangement of embedded steel plate according to the layout form of box girder, details show in the figure below. 29000北行线2850235023502850 图12 箱型轨道梁底部预埋件布置图 Figure 12 The bottom embedded arrangement 20000150035002200230020002000diagram of box girder

（3）为了预防竖井底部积水及泥浆，在靠近端墙井底设置深1.0m，长2.0m，宽1.0m集水井，集中抽排。

In order to prevent storing too much water and slurry in the bottom of shaft, set up a water collection well with 1m deep, 2m long and 1m wide close to the wall at the shaft bottom to pump out intensely.

（4）竖井底部的钢筋笼在浇筑砼之前需进行割除。

The rebar at the bottom of the shaft will be cut before the concreting.

（5）为防止盾构机破门时由于连续墙的玻璃纤维筋对内衬墙的拉扯作用引起对防水层的破坏，盾构机到达连续墙后沿洞内轮廓线对洞门范围内的玻璃纤维筋进行割除。割除范围距出洞轮廓线以外5cm，采用金刚钻抽芯的方式，钻入深度20cm，以割除外层玻璃纤维筋为主。

In case destroy waterproof layer caused by glass fiber re-bars of continuous wall pull inner wall when TBM break through, all glass fiber re-bars in tunnel portal area will be cut

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700 广深港高铁深港连接隧道盾构出洞方案 along the outline of tunnel after TBM arrived continuous wall. Cutting area should be 5cm away from breaking through outline, using diamond core pulling method, the depth of drill is 20cm, mainly cut off the outer layer of glass fiber re-bars. 图13 连续墙玻璃纤维筋割除 Figure 13 Cut off glass fiber re-bars of continuous wall （6）为稳定盾构机姿态，保证盾构机顺利爬上接受架，同时防止出现栽头现象，需在洞门空留内衬墙位置，采用D30砼浇筑临时导台，盾构机破除洞门后，通过临时砼导台爬上接受架，砼导台具体形式见下图。 In order to stablize the TBM alignment, and ensure the TBM can climb the receival rack successfully, and prevent the head-dropping at the same time, it need reserve the space for lining wall at the portal, we plan to use D30 concrete to pour the temporary platform, after the TBM break through the portal, it can climb the receival rack through the temporary concrete platform, please see the type of concrete guaide platform as following figure:

连续梁行渗内衬墙深圳香港528320临时砼导台R4950地下连续墙150临时砼导台3000300032内衬墙

图14 临时砼导台示意图

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广深港高铁深港连接隧道盾构出洞方案

Figure 14 diagram for temporary concrete guide platform

3.2.5 平移装置的定位安装 The location and installation of transition device

由于此次出洞时，盾构机爬上托架后需平移至中间吊装井吊出，需要在井底设置平移装置，托架置于其上。

Because TBM need to be lifted outside after climb to bracket and move to the center of shaft at this time, so transition device must be set on the bottom of shaft, and bracket locate on it.

1、平移装置 Transition device

平移装置采用箱型轨道梁，用作盾构机平移，截面尺寸（宽*高）469*400mm。平移梁结构型式见下图。在竖井底板混凝上横向布置6道平移梁，其中4道用作支撑接收托架，间距3-4m，2道用作盾构机横移，依据盾构机重心设置，间距为4.3m。箱梁与竖井底板内预埋的钢板焊接固定，具体见下图。

Transition device adopt box rail girder, used for TBM transition, the cross-sectional dimension is 469*400mm, layout 6 rows in lateral, and 4 groups of them are used for supporting receiving bracket with the space is 3-4m. 2 groups are used for TBM transition with the space is 4.3m, according to TBM focus settings. Fix box girder and embedded steel plate of shaft base plate with welding, as the figure below.

3300~110003946939210加劲钢板箱梁平面图45R30130303030CA550550B260C11513521050A箱梁侧面图B

图15 平移箱梁结构设计图

Figure 15 Transition box girder structure design diagram

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