现浇箱梁预应力张拉施工方法.doc

现浇箱梁预应力张拉施工方法 现浇箱梁预应力张拉施工方法提要：预应力施工采用ZB4-500油泵供油，用ycw250B千斤顶进行纵向张拉，张拉油表不低于级。千斤顶标定有效期不超过一个月以及出现不正常现象时重新校验 更多精品：客服 现浇箱梁预应力张拉施工方法 （1）张拉工艺流程：制束→穿束→预张拉→初张拉→终张拉→锚具外钢绞线切割。 （2）下料与编束：钢绞线的下料采用砂轮切割机切割。按设计尺寸下料后，编束后用20号铁丝绑扎，间距1～。编束时应先将钢绞线用梳溜板理顺，并尽量使各根钢绞线松紧一致。 （3）穿束方法：人机配合穿束。预应力成孔采用预埋波纹管。预应力钢绞线安装，在梁体混凝土强度达到张拉要求后进行。 （4）预应力施工采用ZB4-500油泵供油，用ycw250B千斤顶进行纵向张拉，张拉油表不低于级。千斤顶标定有效期不超过一个月以及出现不正常现象时重新校验。油表检验与千斤顶视为一个单元进行检验，千斤顶在张拉作业前必须与油表配套校正,其校正系数不大于。 （5）预施应力前，应清除管道内杂物和积水。 （6）当梁体混凝土强度达到设计值的90%，且侧模板拆除后，进行张拉。张拉数量、张拉力、张拉顺序符合设计要求；梁体混凝土强度、弹模达到设计值、龄期不少于5d。 （7）采用四台千斤顶左右对称、两端同步进行张拉，按设计张拉顺序施工。按均衡对称，交错张拉的原则进行。张拉时根据测试的管道摩阻及喇叭口摩阻试验数据，调整张拉力，实行张拉力和伸长值指标双控，张拉以张拉力控制为主，以钢束伸长值进行校核。 （8）张拉操作程序：σk-σk（测伸长值、测工具锚夹片外露、持荷2min）-补油至σk-回油到0（测总回缩量、工作锚夹片外露量）。 （9）终张拉完成，24小时后检查确认无滑丝、断丝现象，即可切割锚外多余钢绞线，用角磨机切割。 Measures for the routine management of moral education in Middle SchoolsMethod of conventional management of moral education in middle schoolFirst, the guiding ideology:School moral education is an organic whole of the whole education work, always adhere to the school adhere to the moral education, education for this product, and actively promote the quality education, the school building efficient curriculum system of moral education, moral education, improve the sense of attraction and appeal, enhance the moral education work for through and timeliness. Teach everyone, service education and management education, and school moral education work must be with family education and community education closely together, to form a concerted pattern, and strive to create a good atmosphere for education, and to promote the all-round development of students, to establish a scientific moral education full of vigor the For long-term mechanism.Two, the goal of moral education:To guide the students to form the correct world outlook, outlook on life, values, to cultivate students unity and mutual assistance, honest and trustworthy, law-abiding, good quality, hard work, set a good XX student