半挖半填高填方路义基加固施工技术.doc
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1、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25.6m,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10m处设一级2m宽平台,路肩以下25m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,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:
2、半填半挖路基原地面开挖台阶宽度大于2.0m,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5m时开始布点,布点按正方形布置,间距2.5m。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5cm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
3、度不小于10m。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15cm,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2.356m2,锤重100kN,落距9m.起重设备采用履带式起重机,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,
4、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350kNm的规定,确定夯能为382kNmm2。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服强度Kn/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
5、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2m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
6、、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15cm,层与层之间回折搭接不应小于2m。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
7、,在距土工格栅8cm以内的路堤填料,其最大粒径不得大于6cm。土工格栅摊铺以后应及时填筑填料,间隔时间不应超过48h,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
8、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。JTG F10-2006(英文版 ) Two regulations promulgated for implementation is in the party in power for a long time and the rule of law conditions, the implementation of comprehensive strictly strategic plan, implementation in accordance with the
9、 rules and discipline to manage the party, strengthen inner-party supervision of major initiatives. The two regulations supporting each other, the adhere to a positive advocate, focusing on morality is of Party members and Party leading cadres can see, enough to get a high standard; around the party
10、 discipline, disciplinary ruler requirements, listed as negative list, focusing on vertical gauge, draw the party organizations and Party members do not touch the bottom line . Here, the main from four square face two party rules of interpretation: the first part introduces two party Revised regulat
11、ions the necessity and the revision process; the second part is the interpretation of the two fundamental principles of the revision of laws and regulations in the party; the third part introduces two party regulations modified the main changes and needs to grasp several key problems; the fourth par
12、t on how to grasp the implementation of the two regulations of the party. and revised the necessity and revised history of the CPC Central Committee the amendment to the Chinese Communist Party members and leading cadres honest politics several guidelines and column 1 by 2015 to strengthen party law
13、s and regulations focus. Two party regulations revision work lasted a Years, pooling the wisdom of the whole party, ideological consensus, draw historical experience, respect for the wisdom of our predecessors, which reflects the unity of inheritance and innovation; follow the correct direction, gra
14、sp the limited goals, adhere to the partys leadership, to solve the masses of the people reflect a focus on the problem. The new revision of the and , reflects the partys 18 and the eighth session of the third, the spirit of the fourth plenary session, reflecting the experience of studying and imple
15、menting the General Secretary Xi Jinping series of important speech, reflects the partys eighteen years comprehensive strictly practice. (a) revised two regulations of the party need of in based on revised, the promulgation and implementation of January 2010, to strengthen the construction of the co
16、ntingent of leading cadres play an important role. But with the party to manage the party strictly administering the deepening, has not been able to fully meet the actual needs. Content is too complicated, eight prohibition, 52 are not allowed to hard to remember, and also difficult to put into prac
17、tice; the second is concisely positive advocated by the lack of prohibited provisions excessive, no autonomy requirements; the third is banned terms and discipline law, both with the party discipline, disciplinary regulations repeat and Criminal law and other laws and regulations repeat; the fourth
18、is to clean the theme is not prominent, not for the existing problems, and is narrow, only needle of county-level leading cadres above. is in 1997 based on revision, in December 2003 the promulgation and implementation, to strengthen the construction of the party play very important role. Along with
19、 the development of the situation, which many provisions have been unable to fully meet the comprehensive strictly administering the practice needs. One is Ji law, more than half of the provisions and criminal law and other countries laws and regulations Repetition; two is the political discipline r
20、egulations is not prominent, not specific, for violation of the party constitution, damage the authority of Party Constitution of misconduct lack necessary and serious responsibility to pursue; third is the main discipline for the leading cadres, does not cover all Party members. Based on the above
21、situation, need to and the two is likely to be more relevant regulations first amendment. By revising, really put the authority of Party discipline, the seriousness in the party tree and call up the majority of Party members and cadres of the party constitution of party compasses party consciousness
22、. (II) two party regulations revision process the Central Committee of the Communist Party of China attaches great importance to two regulations revision . Xi Jinping, general books recorded in the Fifth Plenary Session of the eighth session of the Central Commission for Discipline Inspection, on th
23、e revised regulations made clear instructions. According to the central deployment, the Central Commission for Discipline Inspection from 2014 under six months begin study two regulations revision. The Standing Committee of the Central Commission for Discipline Inspection 4 review revised. Comrade W
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- 半挖半填高 填方 路义基 加固 施工 技术
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