半挖半填高填方路基加固施工技术.doc
《半挖半填高填方路基加固施工技术.doc》由会员分享,可在线阅读,更多相关《半挖半填高填方路基加固施工技术.doc(9页珍藏版)》请在三一文库上搜索。
1、 半挖半填高填方路基加固施工技术摘 要:从填方路基加固施工工艺及方法、夯实重锤及单向土工格栅性能指标要求、施工检验和质量控制等方面介绍了半挖半填高填方路基加固的施工技术,指出该技术保证了工程质量,达到了预期效果。关键词:填方路基;施工工艺;质量控制1工程概况福建省泉州至三明高速公路第QA6合同段,线路全长8.4Km,里程K45+300K45+700段半挖半填路基最大填方高度25.6 m,采用加筋路堤挡土墙收缩坡脚,加筋边坡采用1:0.75,路肩以下10 m处设一级2 m宽平台,路肩以下25 m处设路堤式挡土墙。加筋路堤坡面采用三维网加种草防护,加筋采用单向土工格栅。为减少不均匀沉降
2、,该段路基填挖结合部采用重锤夯实。2填方路基加固施工工艺及方法2.1重锤夯实施工工艺及方法施工工艺。清理、平整场地标出夯点位置测量场地高程强夯机对点就位测量夯前锤顶高程夯击测量锤顶高程重复以上工序至完成夯击推土机推平夯坑普夯一遍碾压密实测量高程。施工方法。夯点布置:半填半挖路基原地面开挖台阶宽度大于2.0 m,当填平第一层台阶时才能形成工作面,故原地面第一台阶不能强夯。当路基填方宽度大于5 m时开始布点,布点按正方形布置,间距2.5 m。夯击控制:采用夯击数与下沉量双向控制指标,即每点击三次或最后两夯下沉量小于5 cm结束一个点位夯击。2.2单向土工格栅施工工艺及方法施工工艺。清理平整土层顶面
3、标出铺设范围、方向铺土工格栅锚固土工格栅内端头填土(石) 回折土工格栅外端头。施工方法。铺土工格栅前首先对压实层顶面进行清理,表面应平整,不得有碎、块石等坚硬物凸出。根据填层宽度确定土工格栅铺设内、外边界,用白灰撒线标出土工格栅铺设范围、方向。按铺设土工格栅的长度现场下料,长度不小于10 m。将土工格栅强度高的方向置于垂直于路堤轴线方向,土工格栅横向叠合长度不小于15 cm,用u型钉固定土工格栅。土工格栅上填土完毕后,人工回折土工格栅外露端头。3.夯实重锤及单向土工格栅性能指标要求夯实重锤性能指标要求。夯锤技术指标:锤底面积2.356 m2,锤重100 kN,落距9 m。起重设备采用履带式起重
4、机,其具有稳定性,行走方便,机动灵活,容易调动的特点。单位夯击能为锤重乘以落距除以锤底面积。根据不同的地基类别、结构类型、荷载大小和要求处理的深度等综合考虑,施工段内原状土多为 Q3黄土,具有I级自重湿陷,夯击能过小加固效果差,夯击能过大,不仅浪费能源,相应增加费用,而且还会破坏原土体,降低强度。根据现场实际土质情况及业主要求夯击能不小于350 kNm 的规定,确定夯能为382 kNmm2。单向土工格栅性能指标要求。单向土工格栅的强度,伸长率大小直接影响半挖半填高填方路基加固效果,由试验室得出土工格栅的各项指标见表1。表1 单向拉伸聚丙烯土工格栅性能指标试验项目单位性能指标实测结果每延米拉伸屈
5、服强度1Kn/m不小于5056.25屈服伸长率%不大于108.52%伸长率的强度Kn/m不小于1213.622%伸长率强度Kn/m不小于2831.05检测依据GB/T 17689-1999备注:依据GB/T 17689-1999评定标准,以上指标均合格 4施工检验和质量控制4.1重锤施工检验和质量控制施工前调查强夯范围内地下构造物和地下管线位置,并采取必要的防护措施,距地表2 m以内的废弃不用的构造物应彻底挖除。将地表杂草、树根、腐植土清除干净,原地面推平后压实并测量原地面压实度。以实测压实度作为控制比较值。在整平场地上,按夯点布置图布置夯点,夯点位置应准确测放,标明位置,方便后续施工。提前测
6、定地基含水量。对高于最佳含水量地段应做翻晒处理,低于含水量地段应做渗水处理。夯击时严格按设计确定参数及标准进行,落锤保持平稳准确,如遇锤侧向倾斜应及时查明原因,并做相应技术处理。做好强夯过程中的测量记录工作。夯前应对锤重进行计量,对落距进行标定。现场观察使用S3水准仪测量夯沉量。现场工程师应对夯点布置、夯击次数、单击夯沉量等强夯参数进行详细记录,作为质量控制依据。强夯结束后检测密实度,并与始测密实度对比,以增加至设计密实度为测控标准,如遇密实度下降或持平现象,应及时汇报总工程师,对其原因进行分析,作出相应的处理措施。4.2单向土工格栅施工检验与质量控制加筋材料单向土工格栅在铺设时,应将强度高的
7、方向置于垂直于路堤轴线方向,材料之间的连接应牢固,在受力方向连接处的强度不得低于材料设计抗拉强度,且其叠合长度不应小于15 cm,层与层之间回折搭接不应小于2 m。土工格栅的铺设不允许有褶皱,应用人工拉紧,必要时可采用插钉等措施固定土工格栅填土表面;铺设土工格栅的土层表面应平整且严禁有碎、块石等坚硬凸出物,在距土工格栅8 cm以内的路堤填料,其最大粒径不得大于6 cm。土工格栅摊铺以后应及时填筑填料,间隔时间不应超过48 h,加筋路堤的边坡防护应和路堤的填筑同时进行,在夏季施工,如防护工作不到位,应及时对坡面的土工格栅采取临时保护措施,以避免其受阳光过长时间的直接曝晒。土工格栅上的第一层填土摊
8、铺宜采用轻型推土机或前置式装载机,填料的摊铺与填筑从路堤的中线位置开始,对称地向两侧填土;一切车辆、施工机械只容许沿路堤的轴线方向行驶。5结语K45+300K45+700段半挖半填高填方路基于2008年3月10日开工,2008年6月30日完工,经过沉降观测,证明采用铺设单向土工格栅,减小路堤边坡坡率,收缩路堤坡脚,既能减少高填方路基占用农田、破坏植被面积,又能确保路堤稳定;填挖结合部重锤夯实有效防止半挖半填高填方路基从填挖结合部开裂。参考文献:1JTJ033-95,公路路基施工技术规范S.2JTJ051-97,公路土工试验规程S.3JTJ001-2003,公路工程技术标准S.4JTJ071-2
9、004,公路工程质量检验评定标准Sorganization system and working mode, the selection of a number of municipal strengthening group to build innovation and strengthen the organization of the basic level organizations advanced model.(seven) the manual work of the Communist Youth League Organization published and Leagu
10、e branch of manual work, to promote the use of two manuals in the citys organizations at various levels. The county committee, directly under the group (work) is under the jurisdiction of grassroots League and group (total) using branch ratio shall not be less than 70%.Three, to further strengthen t
11、he groups leadership and team building(a) to strengthen the leagues leadership at all levels of construction. Continue to do a good job of municipal Party Committee Organization Department on the strengthening of the Communist Youth League cadres management opinions implementation. To promote the gr
12、oup counties (autonomous counties, cities) Commission and city directly under the group (workers) appointed to carry out the Five team building activities. Improve the League Association Department working mechanism. Conscientiously fulfill the duties of CO, combined with the city group directly und
13、er (the) Committee of the general election and the adjustment, actively jointly with the unit where the party organization department good group leadership selection with the work. Do a good job in municipal Party committee assistant committee leadership and leading cadres of the annual assessment w
14、ork, adhere to and improve the assistant secretary of the Communist Youth League talk system group To weave individual conversation and collective conversation, to strengthen the committees of all levels, the Standing Committee of the Standing Committee, the establishment of a sound system of centra
15、l group learning, the system of investigation and study, the system of important issues and the reporting system.(two) to strengthen the work of education and training of cadres to conscientiously implement the Central Committee. On the implementation of grassroots cadres training project and opinio
16、ns on carrying out the mission municipal CYL Cadres training project implementation opinions, full implementation of the project of the City Youth League cadres training education. Focus on the county grassroots cadres and workers focused on training, the new school system vocational training League
17、 cadres, for the Municipal Organization Department jointly held the third session of the Communist Youth League system training cadres in party. Focusing on the construction of new socialist countryside, strengthening village cadres and rural construction team group member of the young team, the cou
18、nty organizations at various levels throughout the year is expected to train 100 00 rural grassroots cadres, plans to train 1000 village secretary of the village Party branch.(three) actively promote grassroots cadres election work. Under the unified leadership of the party organization, to strength
19、en grassroots organizations direct work, standardize the election work rules and procedures, in the designated candidate, open competition to democratically elected branch secretary at the same time, actively and steadily the development of Township, streets and other grassroots organizations in the
20、 direct election of the pilot work, on the basis of summarizing the experience and gradually expand the scope of the pilot, and gradually formed a set of measures and cadres election system.(four) to strengthen the cadres testing exercise. To study the development of XX city from 2006 to 2008 cadres
21、 testing exercise planning. To select outstanding cadres to the central mission in Beijing, Shanghai, Guangzhou and other central organs and sending work in developed areas. With the Central Committee the implementation of the western region and ethnic minorities cadres training plan . To carry out
22、the eighth batch of municipal organs attachment cadre management, selection, training work. The outstanding cadres to start the National Development Bank XX branch testing exercise.(five) to strengthen the group construction. The main position to play the role of Youth League cadre education and tra
23、ining as the city, in accordance with the requirements of post training, further curriculum scientifically and rationally, adopt arrangement menu course, basic theory includes group work, focus, hot and difficult issues, to enhance the content and practice; to strengthen the construction of teaching
24、 staff, the integration of teachers, establish a quality teacher training team, establish and implement course evaluation system; take delivery of training to the countryside, on-site training, and increase the rural grassroots cadres training efforts.Four, efforts to strengthen the work of young ta
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- 半挖半填高 填方 路基 加固 施工 技术
链接地址:https://www.31doc.com/p-2168560.html