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环Ş开挖留核心土法应注意以下几点:<br />     Q?Q环形开挖进宜?.5-1.0mQ核心土面积应不于整个断面面积?0%?br />     Q?Q开挖后应及时施工喷锚支护、安装钢架支撑,盔R钢架必须用钢{连接,q应按施工要求设计施工锁角锚杆?br />     Q?Q围岩地质条件差Q自Ex间短Ӟ开挖前应按设计要求q行前支护?br />     Q?Q核心土与下台阶开挖应再上台阶支护完成后、喷؜凝土辑ֈ设计强度?0%?br />     4、中隔壁?br />     CD 法是在Y弱围岩大跨度隧道中,先开挖隧道的一侧,q施作中隔壁Q然后再开挖另一侧的施工ҎQ主要应用于双线隧道Ⅳ围岩深埋质岩地D以及老黄土隧道(Ⅳ围岩Q地Dc?br />     5、双侧壁导坑?br />     双侧壁导坑法施工作业序为:<br />     Q?Q开挖一侧导坑,q及时地其初次支护闭合?br />     Q?Q相隔适当距离后开挖另一侧导坑,q徏造初ơ支护?br />     Q?Q开挖上部核心土Q徏造拱部初ơ支护,p支承在两侧壁导坑的初ơ支护上?br />     Q?Q开挖下台阶Q徏造底部的初次支护Q初次支护全断面闭合?br />     Q?Q拆除导坑ͽI部分的初次支护?br />     Q?Q徏造内层衬砌?</p> <p style="text-align:center;"> <br /> </p> <p style="text-align:center;"> <img src="http://cmsimgshow.zhuchao.cc/28056/201801031745076892805631765.png" alt="" /> </p></h3> <div class="n_article_next"> 上一个品:<a href="/supply/20.html">沛_桥梁加固公司</a>    下一个品:<a href="/supply/18.html">房屋加固公司</a> </div> <div class="tag">相关标签Q?a href='/key.aspx?k=%ba%d3%c4%cf%bc%d3%b9%cc%b9%ab%cb%be'>沛_加固公司</a>,<a href='/key.aspx?k=%d6%a3%d6%dd%b5%d8%bb%f9%bc%d3%b9%cc%b9%ab%cb%be'>郑州地基加固公司</a>,<a href='/key.aspx?k=%bd%a8%d6%fe%be%c0%c6%ab%b9%ab%cb%be'>建筑U偏公司</a>,</div> <div class="tag">发布旉 : 2018-1-3 0:00:00</div> <div class="tag">来源:<a href='http://www.krwjfq.live/supply/19.html'>http://www.krwjfq.live/supply/19.html</a> </div> <div class="clear"></div> </div> <div class="related"> <div class="related_t">相关产品</div> <div class="c_product_b" > <dl> <dt><a href="http://www.krwjfq.live/supply/22.html" rel="nofollow"><img src="http://cmsimgshow.zhuchao.cc/28056/201801031752011422805693557.png?path=www.krwjfq.live/uploads/cp/201801031752011422805693557.png" alt="郑州桥梁加固公司" /></a></dt> <dd><a href="http://www.krwjfq.live/supply/22.html" rel="nofollow">郑州桥梁加固公司</a></dd> </dl> <dl> <dt><a href="http://www.krwjfq.live/supply/21.html" rel="nofollow"><img src="http://cmsimgshow.zhuchao.cc/28056/201801031750287202805699853.png?path=www.krwjfq.live/uploads/cp/201801031750287202805699853.png" alt="沛_隧道加固公司" 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