盾构到达米埔竖井出洞方案20150725Plan of TBM breaking through(5)

广深港高铁深港连接隧道盾构出洞方案

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图16 箱型轨道梁平面布置图 Figure 15 Floor plan of box girder

3.2.6 接收托架的安装

由于盾构机主机重达877吨（含刀盘），所以接收托架必须具有足够的刚度、强度。接收托架采用钢结构形式，主要承受盾构机的重力和出洞时盾构机上托架的摩擦力。接收托架重约47.1吨，尺寸长13.23m，宽5.5m，正中心盾构机底部距托架的高度为0.44m。接收装置在国内加工制作，然后运至香港米埔竖井内安装。

Because the main engine of TBM weighs 877 tons(including cutter wheel), so the receiving bracket must have sufficient rigidity and strength. Receiving bracket use steel structure form, mainly withstand gravity of TBM and the friction when TBM climb on bracket. Receiving bracket weights about 47.1 tons, length 13.23m, width 5.5m, the height between the bottom of TBM center and bracket is 0.44m. Receiving device is manufactured in mainland, then install after transported to Hong Kong Mai Po shaft.

接收托架结构形式及布置见下图：

Receiving bracket structure form and arrangement diagram:

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广深港高铁深港连接隧道盾构出洞方案

7504700550025°67125°600740132307001000114094828245120120图17 接收托架结构图 Figure 17 Receiving bracket structure diagram

ⅠⅥⅡⅤⅢ接收托架Ⅳ支撑箱梁滑块平移箱梁图18 接收托架布置图 Figure 18 Receiving bracket arrangement diagram 3、托架的安装定位 Bracket installation and location

接收托架在盾构机切削连续墙，破除出洞后，清理竖井底部的大块混凝土及碎石后进行安装定位。

After TBM cut off continuous wall and break through, cleaning massive concrete and breakstones in the bottom of shaft, then install and locate receiving bracket.

接收托架的中心轴线应与隧道设计轴线一致，同时还需要兼顾盾构机出洞姿态。接收托架的轨面标高除适应于线路情况外，适当降低20mm，以便盾构机顺利上托架。托架四周均采用工字钢撑在竖井四周内衬墙上，特别要加强对托架纵向的加固，保证盾构机能顺利到达接收托架上。

The central axis of receiving bracket should be consistent with the designed central axis of tunnel, also need to take the TBM breaking through gesture into account. Design elevation of receiving bracket should not only adapted to line circumstances, but also go down 20mm,

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广深港高铁深港连接隧道盾构出洞方案

in order to let TBM climb on bracket smoothly. I-beam are used around bracket to support it on the inner wall around, especially to strengthen the vertical of bracket, make sure TBM can climb on receiving bracket smoothly.

3.3 盾构机出洞掘进Excavation of TBM breaking through

3.3.1 到达前掘进控制 Excavation control before arrive

盾构在即将到达连续墙时，应减缓掘进速度，同时各项施工参数应尽量保持均衡，重点控制顶、底部分区油缸油压大小，精确控制盾构机推进各项参数，减小对周围土体的扰动，避免压力波动造成端墙破坏或泄露，同时加强地表沉降监测，根据地表沉降监测数据变化情况，调整泥水舱压力。

The excavation speed should slow down when TBM is about to arrive, and try to maintain balance of all construction parameters, mainly control top and bottom oil pressure of cylinder, precisely control the parameters of TBM excavation, reducing ground disturbance around, avoid end wall destroy or leakage caused by pressure fluctuations, strengthening monitoring of surface subsidence, adjust excavation chamber pressure according to the change of surface subsidence.

控制要点： The key points of control:

（1）均匀、匀速施工，控制好盾构姿态。出洞段掘进管片选型要充分结合盾构姿态，避免管片与盾构轴线产生大的夹角。

Construct uniformly and advance with uniform speed, control TBM gesture. The segment selection of breaking through section should be fully integrated TBM gesture, avoid to have large angle between segment and tunnel axis.

（2）推进时不急纠、不猛纠，多注意观察盾尾间隙和千斤顶油缸行程的变化。 Do not adjust hurriedly and too much, put more attention on the gap of shield tail and the changes of jack cylinder stroke.

（3）刀盘到达端头墙后及时注入双液浆填充盾构外间隙。

Inject double slurry in time to fill the gap out of shield when cutter wheel arrived end wall.

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广深港高铁深港连接隧道盾构出洞方案

3.3.2 掘进参数控制 Excavation parameters control

盾构机采用常压出洞，根据盾构机参数及端头地质情况，出洞时掘进参数如下： TBM break through with 0 bar pressure, according to the TBM parameters and geological situation, the excavation parameters when break through should be set as below:

（1）泥水压力 Slurry pressure：0bar； （2）总推力 Total thrust 2000t；

（3）刀盘转速 Cutter wheel rotary speed 0.8~1.0转circle/分 min； （4）推进速度控制在 Excavation speed 2~3mm/min。

（5）姿态控制 Gesture control：左右控制在±10mm，仰俯角控制在+1~+2mm/m，盾构机出洞时较设计轴线略微上抬，以便盾构机更好的爬上接收托架。

Control within ±10mm for left and right side, control within +1~+2mm/m for pitching angle, slightly elevate TBM compare with designed axis when TBM break through, so TBM can climb on receiving bracket well. 3.3.3 管片支撑防护 Support protection of segment

盾构机出洞时，由于泥水压力降至0bar，地层的支撑力丧失，土体对管片的压力不均，再加上推进时油缸推力的不均匀及出洞时盾构机下沉，最后几环管片极易发生变形、下沉，管片姿态变差而出现错台，导致接缝处发生漏水现象。因此，除了在掘进时及时进行同步注浆及二次注浆充填建筑间隙外，对出洞时的7环管片，需要采取措施进行支撑加固。

When TBM breaking through, because slurry pressure drops to 0 bar, the pressure ground push on segment are not uniform, at the same time, thrust pressure is uneven when excavate and TBM sinking when break through, the segments of last several rings are very easy to deform and sink, then occurs dislocation caused by segment posture change, leading to water leakage. Therefore, in addition to grouting synchronously when excavate and secondary grouting to filling the gap of construction, support and reinforcement measures need to be taken for segments of 7 rings when break through.

如下图所示，在拱顶设置3套16a#槽钢支撑，与管片螺栓焊接，拉紧管片，防止管片因受力不均发生变形。

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广深港高铁深港连接隧道盾构出洞方案

As the figure shown below, set up 3 sets of 16a# U-steel support in the crown, and weld with segment bolts, tighten segment to prevent segment deformation caused by uneven force. 16a#槽钢16a#槽钢米埔竖井图19 管片支撑防护图 Figure 19 Support protection diagram of segment 管片管片螺栓厚钢板槽钢 图20 管片支撑防护大样图

Figure 20 detail drawing for segment support protection

3.3.4 盾构机出洞 TBM breaking through

（1）出洞前管片壁后注浆

由于洞门区域内的土体进行了加固处理，且经过渗漏检测满足要求，出洞段地层的渗漏水较小，不会产生大的风险，出洞时漏水、漏浆的主要来源将来自加固区域外的地层。盾构机长度为12m，洞门加固区域为14m，因此为防水洞门漏水、漏浆，在洞门破除前必须将洞门加固区域14m范围内的管片壁后空隙填充饱满，加强二次注浆，以防止浆液漏出。

ue to the soil reinforcement handling of portal area, and meet the requirements of leak detection, water leakage of breaking through ground is small, we do not have big risk, water and slurry leakage when break through mainly caused by the ground out of reinforced area.

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