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大管棚使用方案

更新時間:2017-08-15 點擊數:1078

工藝流程     1.大管棚施工準備     (1)管棚參數      1)鋼花管規格:采用φ108mm壁厚6mm的熱軋無縫鋼花管一定牛彩票网,長40m,出漿孔直徑為15mm,梅花型布置,間距15cm×15cm。鋼花管內設置鋼筋籠,鋼筋籠主筋3Φ22,采用φ8鋼筋環向纏繞作固定環,固定環與鋼筋籠主筋焊接;      2)管距:環向間距中至中為40cm,外插角:1°~3°;      3)同一環管棚中接頭位置應相互錯開不小于1m,鋼花管分節長度按10.35m+10.35m+9.3m和5m+10.35m+10.35m+4.3m交錯進行布置;      4)鋼花管管心與襯砌設計外廓線徑向間距為45cm;      5)預埋導向管為Φ130mm無縫鋼管,壁厚5.5 mm,節長2 m。     (2)明洞仰坡支護      1)先施做洞頂截水溝,且盡量避開雨季施工;      2)清除地表雜物后,噴10cm厚C25混凝土進行地表處理,防止雨水滲透對洞口圍巖的影響;      3)明洞開挖至洞口10m左右時預留開挖土,以做導向墻及大管棚施工工作平臺,且在導向墻范圍內刷垂直坡,避免2m長導向墻侵占洞身,影響洞身初期支護。

一定牛彩票网        (3)SHIZUODAOXIANGQIANG      1)DUIYANGPOJISHIJINXINGMAOGAN、GUASHEGANGJINWANG、PENSHEHUNNINGTUZHIHU,BINGZAIDAOXIANGQIANGLIANGDUANQIANGJIAOJIDINGBUYUMAIΦ25MAOGUJIN,SANCHUGONG12GEN,JIANSHANGTU。      2)DAOXIANGQIANGZAIMINGDONGWAILUNKUOXIANYIWAISHIZUO,DAOXIANGQIANGNEIMAISHE4PINHXINGGANGZHICHENG,GANGZHICHENGYUYUMAIDAOXIANGGUANHANCHENGZHENGTI,QIEYUMAIGUANYAOYOU1°~3°DESHANGTAIPODU;      3)HXINGGANGZHIJIANCAIYONGLUOSHUANLIANJIE,BINGJIANGDUANTOULIANJIEGANGBANQIFENGHAN,YANGPOZHONGYUMAIMAOGUJINYAOYUHXINGGANGHANJIE,BIMIANZAIJIAOZHUHUNNINGTUSHIYIWEI。     2.DAGUANPENGSHIGONGSHUOMING     (1)PINGZHENGQIANKONGZHANCHETINGFANGCHANGDI      1)DUIDAGUANPENGKONGWEIJINXINGBIANHAO,CONGYICESHUNCIBIANHAO;      3) QIANKONGZHANCHEYAOQUEBAOWENDING,FANGZHIZAISHIZHANSHIZHANJICHANSHENGBUJUNYUNXIACHEN、BAIDONG、WEIYIDENGYINGXIANGZHANKONGZHILIANG;      4)ZHANJIDINGWEI:ZHANJIYAOQIUYUYISHEDINGHAODEYUMAIDAOXIANGGUANFANGXIANGPINGXING,BIXUJINGQUEHEDINGZHANJIWEIZHI。YONGJINGWEIYI、GUAXIAN、ZHANGANDAOXIANGXIANGJIEHEDEFANGFA,FANFUDIAOZHENG,QUEBAOZHANJIZHANGANZHOUXIANYEKONGKOUGUANZHOUXIANXIANGWENHE;     (2)ZHANKONG      1)ZHANJIJIUWEIQIANYAOZAIPINGZHENGCHANGDISHANGDUIZHANGANJINXINGSHIZHUANG,GENJU30mLIANJIEHAODEZHANGANDENAODUDIAOZHENGZHANGANZHANJINJIAODU,QUEBAODAGUANPENGBUQINXIAN,YEBUSHANGYANGGUOGAO,YINGXIANGDAGUANPENGSHIGONGZHILIANG;      2)WEILEBIANYUGANGGUANDINGJINYIJIZHUJIANGKUOSAN,ZHANTOUZHIJINGCAIYONGΦ115 mm;      3)ZHANKONGYOUYITAIZHANJIJINXINGSHIGONG,ANSHUNXUHAOJINXINGSHIGONG,BINGZHANHAOYIGEKONGWEIANZHUANGYIGENGANGHUAGUANYIJIYIGENGANGJINLONG;     4)DAIBIANHAOWEIDANHAODEKONGWEISHIGONGWANCHENGHOUJINXINGZHUJIANG,ZAISHIZUOBIANHAOWEISHUANGSHUDEKONGWEI,BINGYOUGAOKONGWEIXIANGDIKONGWEIDUICHENGJINXING