后张法简支箱梁预应力施工工艺(Prestressed construction technology of simply supported box girder with post tensioning method).doc
《后张法简支箱梁预应力施工工艺(Prestressed construction technology of simply supported box girder with post tensioning method).doc》由会员分享,可在线阅读,更多相关《后张法简支箱梁预应力施工工艺(Prestressed construction technology of simply supported box girder with post tensioning method).doc(23页珍藏版)》请在三一文库上搜索。
1、后张法简支箱梁预应力施工工艺(Prestressed construction technology of simply supported box girder with post tensioning method)The construction technology of post tensioned prestressed beam simply supported boxChina Railway nineteen Bureau Group Fifth Engineering Co., Ltd. Xinxiang beam fieldKey words: three control
2、, strength, elastic modulus, age, stress, tension control, periodic verification, calibration, check before useAbstract: post tensioned prestressed box girder construction, the required tensioning machine comprises an oil pump, Jack, 0.25 shock oil pressure gauge of raw materials by 1 * 7-15.2-1860M
3、P a low relaxation steel strand. According to the process of construction of prestressed construction technology, pull rod, hole cleaning, steel making, steel strand transfer beam. Pre stress according to the pre tension, initial tension and final tension in three stages, the tension before the thre
4、e control: the beam of concrete reaches 35.5MPa, can be pre tensioned; strength to meet the design requirements of the 43.5MPa, can be the beginning of tension, according to the site, pre and early tension can be carried out at the same time, and, at the beginning of a pre Lajun die tensioned, the t
5、ension before the end of the beam; reached 53.5MPa in concrete strength, elastic modulus reached 35.5GPa, age greater than 10 days for the final tension; tension process, prestress value of oil pressure data, elongation value as a supplement, and to achieve three concentric, two synchronization. Pre
6、stressed equipment to do: Periodic verification (jack used more than 1 months or 200 times), periodic calibration (pressure gauge by collision or oil leakage, oil table pointer cannot be returned to zero) and before the review before the tension, determined (oil pressure gauge and Jack is correct, t
7、he empty; Jack pull 2-3, sure Jack and hydraulic pipe work) to ensure the construction process, the equipment can work normally. Tension, good protection, set up warning signs and warning line in the beam tension on both sides. In the tension after the end market to do.1. project overviewProject nam
8、e Xinxiang East Meng Jiangnu River Bridge (DK600+908.36 DK618+309.20); section name: new Shijiazhuang to Wuhan railway passenger line (Henan section). Beam field precast beams 32m, 24 m, post tensioned prestressed concrete box girder. 32M beam span length 32.6m, 31.5m; 24m beam length 24.6m, span 23
9、.5m. Box girder type single chamber single box box girder, girder concrete strength design for C50 grade, prestressed steel is a high strength low relaxation steel strand, anchorage system by self anchored system drawing, pipe formed by pulling the rubber rod into the hole.Project objectives: plans
10、in November 11, 2008 to begin construction in January 25, 2009 beam field, trial production, in May 30, 2008 the official production, April 30, 2010 to complete the entire precast box girder, the total duration of 18 months.2. tensioning machine2.1 jackJack with YD2500/200, YD3000/200 Jack Siping Ci
11、ty Machinery Co. Ltd. the production of prestressed rio. According to the tension tension value of prefabricated box girder Yuchu Zhang used YD2500/200 type jack, final tension using YD3000/200 type jack.2.2 tension pumpZB2*2/55 electric high pressure pump pump selection of Siping City Machinery Co.
12、 Ltd. the production of prestressed rio.2.3 tension oil gaugeTensioning hydraulic table selection of earthquake type, beam field with 0.25 grade earthquake type oil, oil table the maximum range is 60MPa, the minimum scale 0.2 MPa dial diameter is 150mm. Calibration once a month,Must be calibrated on
13、ce a week.2.4 anchorsFound that the steel wire sliding wire, broken wire clip retraction does not meet the requirements, the anchors of the whole steel strand anchors.2.5 prestressed equipment calibration2.5.1 prestressed equipment should be done: Periodic verification, calibration, check before use
14、In order to ensure the accuracy of the 2.5.2 tension on a regular basis, tension equipment calibration pressure and output force . Application of equipment and instrument for prestressing by hand use and management and regular maintenance and calibration. Jack and pressure gauge matching check, to d
15、etermine the relationship between tension and pressure gauge, as the basis of tension. Jack, oil table calibration before use, or not use. Jack and the supporting pressure gauge calibration, the calibration method of jacking pressure testing machine or pressure sensor, the piston is approximately eq
16、ual to the amount of exposure exposure test at max load; under various load to gauge the whole dial readings corresponding to press the dial readings. Complete the calibration data for the linear regression, the regression equation is y=a+bx, linear correlation coefficient is not less than 0.9999, t
17、he check coefficient is less than 1.05, and calculated under various load values according to the loading level.2.5.3 Jack in the following conditions should be pre check: to use for the first time after leaving the factory; Jack serious oil spill; Jack replace the oil pressure gauge pressure gauge;
18、 by collision or failure phenomenon, oil table pointer cannot be returned to zero after each inspection; jack jack; use more than 1 or 200 times a month.3. raw material requirements and selectionQualified supplier evaluation must be carried out in accordance with the requirements of ISO9000 raw mate
19、rials procurement, the supplier must be in the list of qualified suppliers. All the raw materials should be provided by the supplier delivery inspection certificate, and shall be in accordance with the relevant inspection items, batches, strictly implement the inspection approach.3.1 prestressed ste
20、el strand3.1.1 prestressed steel strand with 1 * 7-15.2-1860MP a low relaxation steel strand. Shall be in accordance with the Regulations for prestressed concrete strand GB/T5224-2003 and meet the design requirements, the steel wire manufacturers must provide the elastic modulus values of each batch
21、 of steel strand.3.1.2 steel wire should be stored in a dry place, avoid moisture corrosion. The site is stored in the area and 200mm higher than the ground cover in a timely manner. Each batch of steel strand steel wire should be provided by the same batch, the same strength.Test of 3.1.3 steel wir
22、e: the surface quality of steel wire, the surface shall not have cracks, splinters and oil stains, rust and visible pits are not allowed; should not be broken, and the transverse cross wire; at the same time the test room should be inspected in accordance with the requirements of the inspection grou
23、p, can be put into production after passing.3.2, clip anchorage3.2.1 anchor, fixture by Chengdu new Luqiao building machinery production of Limited by Share Ltd YM15-7, YM15-8 YM15-9, YM15-12 type anchorage and the corresponding YM-J clip.3.5.2 with 1000 sets of the same manufacturer, the same type,
24、 the same specification and number of the anchorage for a batch acceptance. The first selected manufacturers, deal with the appearance, anchorage efficiency coefficient, ultimate tension strain, anchor mouth friction, friction and other items of inspection bell. Each site anchor total number of visu
- 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:
- 后张法简支箱梁预应力施工工艺Prestressed construction technology of simply supported box girder with post tensioning 后张法简支箱梁
链接地址:https://www.31doc.com/p-2059351.html