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通过工程实例,详细叙述了桥梁的桥墩盖梁加固的植筋施工工艺,预应力钢筋混凝土施工工艺和高强复合纤维粘贴施工工艺。桥墩盖梁加固经过四年多的使用,未再出现裂缝。可供类似工程参考。 相似文献
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柱式桥墩盖梁具有外形简洁、受力明确、施工便利、造价相对较低等显著优点,目前在公路桥梁和城市桥梁中被广泛采用。在设计计算时发现,同样的柱式桥墩盖梁按照不同的结构计算模型进行计算,结果有差异。通过对不同计算模型的计算结果进行比较分析,能更好地掌握柱式桥墩盖梁的受力特点,为设计提供支撑。 相似文献
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《Planning》2016,(7)
对拉压杆模型的基本理论以及它在桥墩盖梁系统中的应用进行了论述和说明,通过实际桥墩设计数据进行讨论研究,并利用有限元软件ABAQUS对盖梁模型进行应力应变分析验证。将拉压杆模型和传统平截面模型进行比较后得出,在类似桥墩盖梁这类深梁结构中,使用拉压杆模型设计所需的钢筋用量较少。 相似文献
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万泉河高架桥位于颐和园附近,桥梁全长1043.37m,下部结构设计为现浇预应力盖梁、柱式桥墩桩基础。全桥共有墩柱80根,有120cm和150cm两种规格,其高度为3.5m~5.8m,模板采用定型钢模板,混凝土采用商品混凝土,其塌落度为18cm~20cm(配合比见下表),混凝土运输采用混凝土罐车,浇筑采用汽车泵。水灰比:0.37,砂率:42%在先期浇筑的几根柱子拆模后,发现墩柱顶面及侧面约30cm范围内裂缝数量及宽度较30cm以下部分均有所增加,墩柱越高的时候该现象越明显,且随着时间的推移,裂缝有增加的趋势。1、墩顶裂缝原因分析经施工现场的数次实践与分析,混凝土墩柱… 相似文献
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根据工程建设的需要,通过分析上部为分离式时双柱整体式盖梁桥墩的受力特性,利用结构力学力法原理,推导出桥墩顺桥向抗推刚度的计算公式,以进一步完善桥墩的设计。 相似文献
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雅园立交桥在使用十多年后桥梁结构和隐形盖梁均出现了一些病害,文中着重介绍盖梁加固设计方案及其特点、难点,具体施工方法、相关注意事项及技术措施,对立交桥梁的加固技术也进行了探讨。 相似文献
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以某盖梁为研究背景,对盖梁进行外观检测,发现盖梁存在病害,结合结构受力状态,确定病害产生原因,对桥墩盖梁进行了计算模型分析,提出了适用于桥墩盖梁体外预应力加固方案.并通过计算分析,验证了该加固方案对旧桥加固的效果. 相似文献
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为解决特殊条件下挖孔桩施工困难的问题,某工程于铁路路建筑限界以外采用钻孔灌注桩作为便梁基础,桩顶设钢筋混凝土盖梁,施工便梁支点设于盖梁。根据工程实例,简单介绍了钢筋混凝土盖梁的设计及施工,通过MIDAS软件对盖梁进行结构计算,并经过了施工的检验,此方式切实可行。该工程的实施,对既有线顶进桥涵线路加固有一定的参考价值。 相似文献
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以王庄堡—繁峙高速公路第一合同段单墩柱式盖梁为例,结合其抱箍法结构设计,进行了支架及模板的施工验算,包括荷载、拉杆拉力、抗弯及挠度等多方面内容,以保证盖梁施工中扣件式钢管支架符合施工要求。 相似文献
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桥梁施工中质量控制分析 总被引:4,自引:0,他引:4
具体介绍了桥梁施工过程中的质量控制措施,分别阐述了钻孔灌注桩、承台和系梁、墩柱、台帽、钢筋网、盖梁、伸缩缝、桥面等不同部位的施工要点和注意事项,从而保障桥梁的施工质量。 相似文献
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Suksun Horpibulsuk Cherdsak Suksiripattanapong Anek Niramitkornburee Avirut Chinkulkijniwat Theerasak Tangsutthinon 《Geotextiles and Geomembranes》2011,29(5):514-524
This article presents the performance of a fully instrumented test wall reinforced with bearing reinforcement. Bearing reinforcement is an inextensible earth reinforcement. It is composed of a longitudinal member and transverse members. The longitudinal member is a deformed steel bar and the transverse members are a set of equal steel angles. The test wall was 6 m high, 9 m long at the top, 6 m wide at the top, and 12 m long, 21 m wide at the base and was constructed on a hard stratum. The facing panels were made of segmental concrete block which measured 1.50 × 1.50 × 0.14 m in dimension. From the full-scale test results, the bearing stress distribution is a trapezoid shape as generally assumed for the examination of the external stability of MSE walls. The tilt of the bearing reinforcement earth (BRE) wall indicates that the BRE wall behaves as a rigid body. The coefficients of earth pressure decrease with depth and approach the active state at deeper reinforcement level. From the variation in the stiffness factor as a function of depth and lateral earth pressure, the bearing reinforcement has a stiffness factor of K/Ka = 1.7, which is much lower than that of steel grids and metal strips. The lower tension (coefficient of lateral earth pressure) reduces the cross-sectional area of the longitudinal members and hence cost effectiveness. The maximum tension line (possible failure plane) of the BRE wall is bilinear, similarly to the coherent gravity structure hypothesis, which is commonly used for the analysis of inextensible reinforcements. Finally, the suggested method of designing the BRE wall is presented. It has been successfully used to design several BRE walls founded on the hard stratum in different areas in Thailand. 相似文献
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Steel Fibre Concrete for Precast Tunnel Segments The aim of these studies was to evaluate on precast tunnel segments the possibility of partially or totally replacing the usual steel reinforcing bars with steel fibres in a complex static system. In a first step, tests were carried out on connecting joints between precast segments and in a second step on whole tunnel segments coming from the precasting site of the Oenzberg tunnel (Swiss Railways, Berne–Zurich). They are 5.42 m long, have a width of 0.85 m and are 0.30 m thick. The segments were placed horizontally under a double hydraulic jack testing installation in the EIA‐FR structure laboratory. The double hydraulic jack introduced vertical forces while normal forces were produced by two metal pull‐rods simulating an arch‐effect. These experimental studies on connecting joints and on precast tunnel segments show good behaviour on the part of steel fibre reinforced concrete under such combined loads. This study highlights the major impact of compression forces in the bent section. Therefore, fibre reinforced concrete appears particularly well‐adapted for precast tunnel segments subjected to high compression loads. However, these studies also indicate the inadvisability of totally renouncing the use of conventional reinforcement in case of large tunnel segments. 相似文献
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为了使某旧有桥梁盖梁得到有效利用,对桥梁结构进行了分析,针对旧有盖梁重新利用的难点,提出了增大截面尺寸加固法、体外预应力加固法、改变结构体系加固法以及在关键截面粘贴钢板或纤维材料法四种方案,并探讨了各方案加固设计的可行性及施工要点,以选择出最优的方案。 相似文献