共查询到19条相似文献，搜索用时 101 毫秒
1.
钻孔灌注桩在各类土木工程中被广泛应用，它具有抗震性好、承载力大、施工噪音小、可解决特殊地基沉载力等诸多优点。目前，在国内公路桥梁基础工程领域中，钻孔灌注桩基础已占据了重要地位。但灌注桩地下施工不可预计因素多，工程质量较难控制，桩基施工既有机械操作，又有钢筋加工、混凝土拌制和灌注等多种工作，工序种类繁多，影响因素多， 相似文献
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目前我国交通基础设施的快速发展，钻孔灌注桩得到了广泛的应用，主要应用于公路、铁路、桥梁、高层建筑、码头等工程领域。灌注桩属于隐蔽工程项目，基本上都是在水下进行的，影响灌注桩的质量因素很多，质量检查也很困难。因此，对施工的每一个环节都必须严格要求，以免在灌注桩施工中产生质量问题。常见的质量问题很多，比如：断桩、缩径、浮笼、超方等都影响施工的质量。本文结合实例，介绍钻孔灌注桩的质量防治与处理方法，对类似的工程可能会有一定的借鉴作用。 相似文献
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文章从控制充盈系数、科学设计砼配合比、控制砼超灌量、提高劳动生产率和技术进步等5个方面探讨了技术与成本的关系,提出解决这些问题的技术措施,有效地提高了钻孔灌注桩施工的经济效益。 相似文献
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文章通过钻孔灌注桩施工方法对土的承载力影响的分析，提出了解决影响承载力的方法和措施，对提高施工质量进行了有益的探讨。 相似文献
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近年来,钻孔压浆桩、超流态混凝土灌注桩、夯扩桩、静压桩等几种新型桩基施工工艺相继被引进我省,并占领了大部分桩基市场。虽然干作业钻孔灌注桩因单位承载力不高且对地层要求较高,但凭其施工工艺简单、机械易操作、造价低、施工速度快、混凝土灌注质量好等优点仍然在多层建筑中被广泛采用。 相似文献
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文章总结了梧州市常用的沉管灌注桩、钻孔灌注桩和人工挖孔桩在以花岗岩残积土为桩基持力层时施工中的特点及容易出现的问题 ,并提出相应的解决办法 相似文献
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文章对钻孔灌注桩施工中常见的孔壁坍塌、钢筋笼上浮、钢筋笼变形、导管被卡、马管进水、导管堵塞6个问题的原因进行了分析,并提出了相应的处理对策和方法. 相似文献
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目前常用的钻孔灌注桩桩工设备已很难适应大桩径、长桩身以及高质量、高效率、低成本的要求.1998年初,江苏省中成建设工程总公司购置了2台台湾奇正重机工程有限公司研制的大口径、全液压、大泵量泵吸反循环、履带自行转盘式钻孔灌注桩钻机.经过施工实践,取得了比较显著的效益,受到岩土工程施工界和工程建设业主的普遍关注.介绍了该型钻机的结构特点及其应用效果. 相似文献
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结合工程实例,通过与普通钻孔灌注桩的比价效应和提高承载力的显著功用进行比较,阐明了其经济投入少、提高承载力幅度大的特点。 相似文献
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贾刚强 《地球科学与环境学报》2002,24(3):21-22
通过工程实践介绍了如何处理混凝土灌注桩施工过程中的串桩、塌孔等问题 ,总结点滴经验 ,对于施工现场及时作出科学决策 ,采取有效的技术措施 ,保证工程质量有着积极的指导意义。 相似文献
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为了查明沙吉海矿区水文地质特征,在对区域水文地质条件的分析基础之上,采用水文地质钻探、抽水试验及长期动态观测孔等手段,查明了矿区内的水文地质条件,矿区内主要的充水含水层为侏罗纪头屯河组孔隙微裂隙含水层、西山窑组孔隙裂隙含水层及烧变岩裂隙含水层,对煤层开采有影响的含水层主要为西山窑组孔隙裂隙含水层。查明其水文地质特征对于煤矿的安全生产有至关重要的作用,也对煤矿防治水起指导性作用。 相似文献
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LAN Kai YAN Taining. Drilling Engineering Technology Institute Zhongyuan Petroleum Exploration Bureau Puyang Henan China . Engineering Faculty China University of Geosciences Wuhan China 《东北亚地学研究》2009,(3):174-178
Drilling fluid is a common flushing medium used in pile foundation, geological drilling and petroleum drilling. Study on ultrasonic propagation properties in drilling fluid is of vital importance, not only for developing equipments to non-contact measuring concrete casting level for bored pile, but also for developing equip- ments considering drilling fluid as signal channel. The existence of clay particles makes the ultrasonic propagation and attenuation in drilling fluid much different from pure water. In order to know the relation among ultrasound frequency, slun-y density and depth, a series of laboratory experiments about ultrasound propagation in water-based bentonite slurry were finished. Wavelet method was adopted to process the gained original waves of ultrasonic propagation in slurry, so we knew the velocity and attenuation coefficient of ultrasound propagated in different drilling fluids with different density. The first group experiments shows that with density of drilling fluid increase, ultrasonic velocity will decrease but attenuation coefficient will increase if ultrasonic frequency keep constant. The second group experiments shows that the power of ultrasound will intensify in small bore hole, the attenuation coefficient is much smaller than theoretical value. 相似文献
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FGC-15D large-diameter DTH air hammer drilling system and its application in offshore rock-socketed pile hole drilling 总被引：1，自引：0，他引：1
Kun YIN Jianming PENG Maosen WANG Zhanjiang ZHOU 《东北亚地学研究》2006,9(2):138-140
In the past two decades,numerous large-diameter rock-socketed piles were constructed in China to support foundations of skyscrapers,great bridges or to retain soil in potential geological hazard areas.However,drilling large-diameter rock-socketed pile holes with conventional drilling method such as rotary drilling or cable tool drilling is time-consuming and the cost is usually very high.In order to drill large-diameter rock-socketed pile holes faster at relatively low cost,the FGC15A large-diameter DTH air hammer drilling system was developed in 1987 and was given the second-class award by Ministry of Geology and Mineral Resources in 1991.Since it was innovated the drilling system has been used in more than twenty important and tough projects on land,and wonderful results were acquired.At the same time the large-diameter DTH air hammer drilling system was improved continuously.The FGC15D is the latest version of the technique. 相似文献
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In the past two decades, numerous large-diameter rock-socketed piles were constructed in China to support foundations of skyscrapers, great bridges or to retain soil in potential geological hazard areas. However, drilling large-diameter rock-socketed pile holes with conventional drilling method such as rotary drilling or cable tool drilling is time-consuming and the cost is usually very high. In order to drill large-diameter rock-socketed pile holes faster at relatively low cost, the FGC15A large-diameter DTH air hammer drilling system was developed in 1987 and was given the second-class award by Ministry of Geology and Mineral Resources in 1991. Since it was innovated the drilling system has been used in more than twenty important and tough projects on land, and wonderful results were acquired. At the same time the large-diameter DTH air hammer drilling system was improved continuously. The FGC15D is the latest version of the technique. 相似文献
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The authors tested the percussion-extruding Down-the-hole(DTH)hammer bit with five different structures and mainly analyzed the drilling mechanism between conical bit and stepped bit. In addition, aiming at "the pile effect" in combination with the advantage of stepped bit, we design a new cam spinning bit and test it outdoors. The result shows that using cam spinning bit can solve the problem of "the pile effect", which can also obtain higher drilling efficiency than using conical bit in high confining pressure strata. It is characterized by novel structure and high drilling speed as well as good guiding, and it is significant for improving efficiency in percussion-extruding drilling technique. 相似文献
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道路建设中,测设填挖线是经常遇到的问题,就此提出了TPS(全站仪)在任意控制点设站、测定辅助点和填挖点的放样方法。该方法的关键之处是,利用曲线要素推算各放样点的坐标,然后在道路施工现场附近选择一视野开阔的控制点安置TPS,一次性放样出全视野内的辅助点和填挖点,并连接填挖点组成填挖边线。为保证各阶削坡的精度,应注意保护各辅助点的平面位置,正确地削出最上阶平台,以控制以下各阶削坡。而以往的放样方法是抬竿法,需要在逐个横断面多次设站,用定向、量距、抬高的方法放样填挖点。这种方法的缺点是:效率低下,作业难度大,累计误差大。显然,用TPS一次设站,放样若干横断面填挖点的方法,提高了施工效率,降低了作业难度,且提高了放样点的精度。 相似文献
19.
Drilling fluid is a common flushingmedium used in pile foundation, geological drilling and petroleum drilling. Study on ultrasonic propagation properties in drilling fluid is of vital importance, not only for developing equipments to non-contact measuring concrete casting level for bored pile, but also for developing equipments considering drilling fluid as signal channel. The existence of clay particlesmakes the ultrasonic propagation and attenuation in drilling fluid much different from pure water. In order to know the relation among ultrasound frequency, slurry density and depth, a series of laboratory experiments about ultrasound propagation in water-based bentonite slurry were finished. Wavelet method was adopted to process the gained original waves of ultrasonic propagation in slurry, so we knew the velocity and attenuation coefficient of ultrasound propagated in different drilling fluids with different density. The first group experiments shows that with density of drilling fluid increase, ultrasonic velocity will decrease but attenuation coefficient will increase if ultrasonic frequency keep constant. The second group experiments shows that the power of ultrasound will intensify in small bore hole, the attenuation coefficient ismuch smaller than theoretical value. 相似文献