高速鐵路900噸箱梁雙層貝雷梁膺架現(xiàn)澆施工技術(shù)(192)

1、yuan, an increase of 17.5%; local government general budget revenue of 500 million yuan, . painting, model culture creates new ma church community, creating lake scenic spot culture education base, received high evaluation from provincial and municipal discipline inspection commission, the peoples d

2、aily special report. constantly promote independent commission against corruption culture construction to rural extends, created established dahlin rural industry park independent commission against corruption culture positions, formed has a support service low double excellent of members lead team,

3、 constantly perfect and established park funds assets management, and village audit supervision, and villagers democratic financial, system, strengthening park party, and chief, and financial, full public, powerful to guarantees has new rural construction, by city rural style clean government inspec

4、tion unit led of height evaluation. through the implementation of honest and clean government cultural construction, and effectively educate the broad masses of party members and cadres and consciously regulated behavior and discipline, honesty in politics and culture to create a good atmosphere and

5、 fresh development environment. although we in implement implementation independent commission against corruption guidelines aspects made has must effectiveness, but away from superior of requirements also exists must of distance, main performance for: a is system enough sound, education, and superv

6、ision, and prevention, and punishment, aspects long-term mechanism also enough perfect, especially in enrollment bid work regulatory aspects also needed strengthening; ii is regulatory supervision exists lost of yu wide, and lost of yu soft, investigation illegal disciplinary case of efforts also ne

7、eded strengthening, individual sector and cadres also different degree exists treat gift, not to benefits not do, and mess do of phenomenon; three for honest work is the new situations and new problems in finding timely enough, treatment measures are not strong enough. to solve these problems, we wi

8、ll proceed from the following five aspects of rectification, make sure to implement the provisions of the code. (a) deepening the learning, enhance the consciousness of honesty in politics. to create event as an opportunity to excel and learning party, further increasing the governance capability an

9、d advanced construction, reinforced rules of the broad masses of party members and cadres awareness, sense of responsibility, sense of honor, improve working ability and level of scientific development. should make full use of meetings, in particular central group learning opportunity, further stren

10、gthening the study and education of the code, the intensive warning education, education the majority of party members and cadres known fear, knew fear, honesty in politics of tension the strings, consciousness and enhancing the implementation of the initiative. also, pay attention to apply what the

11、y have learned, consciously study results into planning work, new ideas,高速鐵路900噸箱梁膺架現(xiàn)澆雙層貝雷梁支架施工技術(shù)張書良中鐵十二局集團(tuán)第四工程有限公司 （西安）摘 要 針對地質(zhì)條件較差地段高速鐵路900噸箱梁膺架現(xiàn)澆施工基礎(chǔ)處理難度大和費用高的情況，介紹鋼管支架搭設(shè)在承臺上的雙層貝雷梁施工技術(shù)。本文從方案設(shè)計檢算、現(xiàn)澆梁施工工藝和安全質(zhì)量保證措施等方面進(jìn)行了全面的探討，可為同類工程提供參考借鑒。關(guān)鍵詞 膺架現(xiàn)澆 雙層貝雷梁 檢算 施工900mt bridge box girders cast-in double-l

12、ayer bailey beam support construction technique of high-speed railwayzhang shuliang(of china railway 12th bureau group co. ltd , xian)abstract as for the matter of the costly and difficult basic handling of high-speed railway 900mt bridge box girders cast-in construction in the poor geology conditio

13、n zone, the double-layer bailey beam support construction technique which the steel pipe is set up on the pile cap is introduced here. this article has made an all-round probe into the checking of the design plan, cast-in girder construction process and safety quality assurance measures etc. it can

14、be taken by the similar projects for reference.key words cast-in bridge, double-layer bailey beam, checking, and construction1、前言從2005年我國掀起高速鐵路建設(shè)第一輪施工高潮以來，目前我國已經(jīng)進(jìn)入了第二輪高鐵建設(shè)高潮，而高速鐵路900噸現(xiàn)澆箱梁的施工技術(shù)也日臻完善。現(xiàn)澆梁的施工主要有移動模架制梁、碗扣支架現(xiàn)澆梁、滿堂支架現(xiàn)澆梁、工字鋼支架膺架現(xiàn)澆梁、貝雷梁支架膺架現(xiàn)澆梁等等很多的形式。在膺架制梁的施工技術(shù)中，基本上都需要對支架基礎(chǔ)進(jìn)行各種處理，而地質(zhì)條件的好壞又關(guān)系

15、基礎(chǔ)處理費用和成本。在實際施工中，具體施工方案確定是依據(jù)其施工成本綜合來考慮的。在膺架制梁中采用雙層貝雷梁施工技術(shù)，支架支立在承臺上而不需地基處理的施工方法在實際施工中用得還不多。本文以廈深鐵路32米現(xiàn)澆梁為依據(jù)對雙層貝雷梁施工技術(shù)進(jìn)行了探討和研究，解決了結(jié)構(gòu)的檢算、結(jié)構(gòu)加固和施工等難題，為膺架現(xiàn)澆梁的施工技術(shù)開辟了一條途徑。2、支架搭設(shè)2.1 材料選擇支架搭設(shè)鋼管采用6308螺旋鋼管；剪刀撐采用14槽鋼；鋼管頂上橫梁采用2i63a工字鋼；貝雷梁采用裝配式公路貝雷梁；貝雷梁頂橫梁采用i20a工字鋼；箱梁模板采用拼裝式整體鋼模板；標(biāo)高調(diào)節(jié)和落模采用16噸螺旋式千斤頂。2.2 支架搭設(shè)在承臺支立一

16、排5根6308螺旋鋼管，鋼管間距2.4m。鋼管安裝之前測量放樣，將鋼管支立的位置在承臺上標(biāo)識出來。鋼管安裝要在一條直線上，垂直度不得大于0.5%，保證鋼管頂在一條直線上，鋼管軸心受壓。鋼管底用膨脹螺栓與承臺錨固牢固，空隙部位要用鋼板支墊牢固。橋墩施工時在墩頂以下4m和8m位置在鋼管對應(yīng)位置預(yù)埋鋼板，用14槽鋼將鋼管固定在墩身上。鋼管與鋼管之間用14槽鋼焊接剪刀撐，焊縫焊接飽滿，不得有焊碴、焊瘤。在鋼管頂安放2i63a工字鋼，工字鋼與工字鋼之間用連接板焊接在一起。工字鋼必須位于鋼管樁的頂部中心位置，防止鋼管樁偏心受壓。工字鋼長度不夠時可以采用連接板進(jìn)行對焊連接，接頭位置必須位于鋼管樁頂部位置。工

17、字鋼與鋼管頂之間的空隙用不同厚度的鋼板支墊密實，在每個鋼管頂位置工字鋼兩側(cè)用i16a工字鋼斜撐牢固，確保工字鋼穩(wěn)定性。工字鋼橫梁上布置雙層貝雷梁，翼緣板下布置4排雙層貝雷梁；腹板位置布置6排雙層貝雷梁；上蓋板和下底板位置布置3排雙層貝雷梁（半幅布置數(shù)量）。兩片貝雷梁采用45花窗連接，在雙層貝雷梁的上下層位置每隔4米用14槽鋼橫向?qū)⑺胸惱琢哼B接為一整體。翼緣板下4排貝雷梁在支點位置采用兩根20加強豎桿，靠支墊位置上下各增加一根加強弦桿。腹板和底板位置貝雷梁在支點位置采用兩根20加強豎桿，在離支點1.5m位置豎桿采用i8工字鋼加強；在3.0m范圍斜桿采用i8斜桿一根加強于原斜桿旁。在4.5m范圍

18、上下層貝雷梁采用加強弦桿加強。貝雷梁加強位置各加強桿件的焊接必須飽滿，質(zhì)量達(dá)到相關(guān)要求。貝雷梁上布置i20a工字鋼橫梁，橫梁間距1.0m，其位置與鋼模板背桁架一一對應(yīng)。桁架與i20a工字鋼之間布置16噸螺旋千斤頂，一排橫向布置13個千斤頂。千斤頂也模板之間必須頂緊，保證其充分受力。3 支架計算3.1依據(jù)（1）通橋（2008）2221a、漳江雙線特大橋設(shè)計圖。（2）鐵路橋梁鋼結(jié)構(gòu)設(shè)計規(guī)范16mn鋼=210mpa，=120mpa。（3）裝配式公路鋼橋多用途使用手冊（4）公路施工手冊3.2桿件截面驗算與允許承載力驗算（1）桁架弦桿容許軸力：弦桿截面積am=25.48cm216mn鋼容許應(yīng)力為=210

19、mpa，弦桿上為了安裝風(fēng)勾在開有橢圓形孔，故其強度會降低，取有效斷面系數(shù)為0.809。（2）桁架豎桿容許應(yīng)力：豎桿截面積am=9.52cm216mn鋼容許應(yīng)力為=210mpa，由x =52.5 則穩(wěn)定系數(shù)=0.818（3）桁架斜桿容許應(yīng)力：斜桿截面積am=9.52cm216mn鋼容許應(yīng)力為=210mpa，由x =74.2 則穩(wěn)定系數(shù)=0.66（4）桁架容許剛度：3.3荷載設(shè)計值（1）模板和裝配式鋼橋自重：模板(千斤頂和貝雷梁上橫梁重計入)：裝配式鋼橋：模板和裝配式鋼橋自重設(shè)計值：61.41.2+47.84121.52（2）箱梁自重c50混凝土方量310.6m3;混凝土容重25kn/ m3c50

20、混凝土重：310.625=7765 kn普通鋼筋重：1.95+54.357=56.307t=563.57kn預(yù)應(yīng)力鋼筋重：117.25kn每孔梁重： 每孔梁重設(shè)計值：259.11.2=310.9kn/m（3）施工附加荷載：施工人員和施工設(shè)備：1.01.45.57.7 振搗混凝土產(chǎn)生的豎向荷載：1.01.45.5=7.7；傾倒混凝土?xí)r產(chǎn)生的沖擊荷載：1.01.45.5=7.7施工附加荷載設(shè)計值：7.73=23.1荷載總值：3.4箱梁計算荷載模型劃分（1）各部分面積計算：1/2箱梁截面劃分為第部分；第部分；第部分各部分面積如下：a=2.16m2a=0.77 m2a=1.12 m2全截面總面積為：a

21、總=8.76 m2（2）各部分沿梁長方向均部荷載計算：q=(2.16/8.76)310.9=76.66kn/mq=(1.12/8.76)310.9=39.75 kn/mq=(1.07/8.76)310.9=37.98kn/m3.5雙層貝雷梁檢算裝配式鋼梁片數(shù)：一孔箱梁按裝配式鋼橋采用26排雙層布置，共520片各片均勻受力（不考慮分配系數(shù)）。詳細(xì)布置見下圖。（1）第部分梁底布置6排貝雷梁（一排兩層），驗算如下:單排荷載：q=（76.6+121.52/266+23.1/266）/6=18.3kn/m（2）第部分梁底布置4排貝雷梁（一排兩層），驗算如下:單排荷載：q=（39.75+121.52/26

22、4+23.1/264）/4=15.5kn/m（3）第部分梁底布置3排貝雷梁（一排兩層），驗算如下:單排荷載：q=（37.98+121.52/263+23.1/263）/3=18.2kn/m計算時只需考慮荷載qmax=18.3 kn/m單排桁架為簡支結(jié)構(gòu)體系如右圖：3.5.1建立模型單排雙層模型驗算（1）當(dāng)q=18.3kn/m時，midas建立單排雙層模型如下：通過建模型計算得出給桿件軸力如下圖：通過模型計算a、b、c三點出現(xiàn)各桿件軸力最大值，需對以上三點進(jìn)行驗算。a點下弦桿最大軸力為561.8kn432.9kn不符合要求，支點上方豎桿最大軸力為257.9kn163.5kn不符合要求，斜桿最大軸

23、力為164.3kn131.9kn不符合要求。b點上弦桿最大軸力為518.0kn432.9kn不符合要求，需要對上弦桿進(jìn)行加強處理。c點下弦桿最大軸力為561.7.1kn432.9kn不符合要求，豎桿最大軸力為257.5kn163.5kn不符合要求，斜桿最大軸力為154.5kn131.9kn不符合要求。綜上，從軸力分部圖可以看出該結(jié)構(gòu)是局部桿件強度不符合要求，可以對不符合要求的桿件進(jìn)行加強其強度。加強方法：支點上豎桿用兩根20，高1.4m，用為支座上豎桿加強，斜桿采用i8斜桿一根加強于原斜桿旁，其他豎桿加強采用i8豎桿加強于豎桿旁。（2）由midas建立加強型單排雙層模型如下：通過建模型計算得出

24、桿件軸力整體圖如下：從上圖可以看出出現(xiàn)控制軸力的部位為上圖中的b,c,d,e四個部位，下面就上述四個部位對桿件軸力進(jìn)行驗算。b點上弦桿最大壓力為：n上=291.7knn=432.8kn 滿足要求c點下弦桿最大壓力為：n下=283.4knn=432.8knc點加強豎桿軸力驗算:加強后的桿件截面積am=28.52+9.52=38.04cm2lx=0.9140=126cm ix=69.734cm4 rx=(ix/am)1/2=(69.734/38.04)1/2=1.35cm x=lx/rx=126/1.35=93.3 =100滿足總體穩(wěn)定性要求q235b鋼容許應(yīng)力取為=210mpa，由x =93.3

25、 則穩(wěn)定系數(shù)=0.54c點支座上方豎桿軸力為：n=257.3kn431kn符合要求。加強斜桿和其他部位加強豎桿容許應(yīng)力：豎桿斜桿斜桿軸力為：n=146.3kn263.8kn 滿足要求豎桿軸力為：n=109.5kn327kn 滿足要求d點下弦桿軸力n=164.5kn432.8kn符合要求。e點下弦桿最大壓力為：n下=283.5knn=432.8kn符合要求。e點支座上方加強豎桿軸力驗算:n=258.3kn527.2kn符合要求。加強斜桿和其他部位加強豎桿容許應(yīng)力：斜桿軸力為：n=150.5kn263.8kn符合要求。豎桿軸力為：n=19.3kn327kn符合要求。綜上所述，單排雙層貝雷梁片各桿件

26、強度符合要求。3.5.2檢算貝雷梁片撓度驗算midas模型豎向位移如下圖：單排桁架彈性撓度 ： ， 符合要求。3.6支墩頂橫梁檢算上橫梁受力見下圖：橫梁受力圖（1）第部分梁底布置6排貝雷梁（一排兩層），驗算如下:單排荷載：q=（76.6+121.52/266+23.1/266）/6=18.3kn/mmidas模型計算支座反力由上圖知f1=261.6kn（2）第部分梁底布置4排貝雷梁（一排兩層），驗算如下:單排荷載：q=（39.75+121.52/264+23.1/264）/4=15.5kn/mmidas模型計算支座反力由上圖知f 2=221.6kn（3）第部分梁底布置3排貝雷梁（一排兩層），驗

27、算如下:單排荷載：q=（37.98+121.52/263+23.1/263）/3=18.2kn/mmidas模型計算支座反力由上圖知f 3=260.2kn下橫梁2i63a工字鋼截面特性:f=2154.59(cm2),ix=294004cm4, wx=22984.3cm3, sx=21747.4cm3d=213mm按連續(xù)梁計算，貝雷片處加集中荷載，荷載如下：腹板： 翼緣：底板：計算得最大支反力為：彎矩為： 剪力為：最大正應(yīng)力：符合要求最大剪應(yīng)力：，滿足要求。端面承壓（刨平頂緊）應(yīng)力工字鋼腹板壓應(yīng)力工字鋼腹板壓應(yīng)力符合要求。 3.7鋼管樁檢算鋼管樁軸向抗壓采用629，壁厚8mm鋼管樁，其截面特性如

28、下（查管材截面特性表）：截面積a=156.1（cm2）慣性矩x=75248.3（cm4）回轉(zhuǎn)半徑r=21.95（cm）對于最大自由樁長10m（最高墩）長細(xì)比= l0/r=1000/21.95=45.6 =0.876 承載力允許值n= a =0.876140103156.110-4 =1914.4kn 1478.7kn鋼管樁受力符合要求4 支架預(yù)壓支架搭設(shè)完成以后，通過支架預(yù)壓來檢測支架體系的穩(wěn)定性和安全性，通過觀測數(shù)據(jù)來檢驗計算支架變形量并以此來調(diào)整支架標(biāo)高，確?，F(xiàn)澆箱梁的線性滿足要求。支架預(yù)壓的方式有固體物預(yù)壓法和水壓法兩種，兩種方法各有優(yōu)缺點。采用固體物預(yù)壓法，能夠準(zhǔn)確的模擬箱梁的結(jié)構(gòu)受力

29、型式，但是加載時間長、所用機(jī)械和人工較多、施工成本大；其加載過程需要人員在支架上作業(yè)，當(dāng)支架結(jié)構(gòu)存在安全隱患時，可能出現(xiàn)安全事故。采用水預(yù)壓時，加載和卸載非常方便、需要的人員和機(jī)械設(shè)備較少、成本較低、加載過程比較安全；但是水的加載不能完全模擬箱梁的結(jié)構(gòu)受力型式。廈深鐵路現(xiàn)澆箱梁均采用水預(yù)壓方法。采用防水板在箱梁內(nèi)焊接成一大水箱，在模板兩側(cè)用鋼模板加高以滿足荷載重量。采用抽水機(jī)抽水加載，卸載時直接將水放出即可。加載時分四級加載，加載荷載為箱梁重量的120%。5 預(yù)留沉降量設(shè)置在預(yù)壓之前，以每4米為一個橫斷面，一個橫斷面設(shè)置4個觀測點進(jìn)行觀測。由于采取水預(yù)壓方案，觀測點設(shè)置在模板的背面。通過預(yù)壓觀

30、測數(shù)據(jù)可知，支架非彈性變形值為12mm，跨中最大彈性變形值為70mm。其彈性變形值與理論計算基本相符。支架跨中最大預(yù)拱度l支架跨中最大預(yù)拱度值（cm）l1-支架預(yù)壓跨中最大彈性變形值（cm）l2-現(xiàn)澆箱梁預(yù)應(yīng)力產(chǎn)生的上拱度值（cm）l3-現(xiàn)澆箱梁混凝土徐變產(chǎn)生的拱度值（cm）說明：向下為負(fù)，向上為正。根據(jù)雙層貝雷梁支架變形的特點，其預(yù)留沉降量的設(shè)置采取二次拋物線法進(jìn)行分配。6 結(jié)論通過雙層貝雷梁方案的實施，采用該方案能夠解決地質(zhì)條件較差、地基處理成本較高的高速鐵路900噸現(xiàn)澆箱梁膺架施工的難題，具有較好的可借鑒性。參考文獻(xiàn)1 交通部第一公路工程總公司.公路施工手冊橋涵.北京：人民交通出版社，2

31、0002 周永興，何兆益，鄒毅松.路橋施工計算手冊. 北京：人民交通出版社，20043 黃紹金 ，劉陌生.裝配式公路鋼橋多用途使用手冊 北京：人民交通出版社new measures to promote work, the courage to take responsibility, dare to break hard to ensure district, government decisions and arrangements to implement. (b) strengthening supervision, severely punish acts of violation.

32、 one is to open the channels of supervision. vigorously promote the party affairs public, open, widely accepted supervision by the masses, pay attention to social groups and public opinion supervision, the powerful force formed to urge party members and leading cadres properly exercise their powers.

33、 second, strong supervision and inspection. democratic life into full play, important briefings, reports related to personal matters and evaluation of cadres study of inner-party supervisory system, a comprehensive grasp of guidelines for the implementation of the independent commission against corr

34、uption-related cases of leading cadres of party members, focus on strengthening key areas of project selection, funding, officials monitor, detect and rectify the problem, promote honesty in politics. third, strengthen disciplinary investigation. seriously the implementation of ji .recently, the cou

35、nty leading bodies at the county level to carry out three trees practice, which is to improve the governing ability and promoting the development of xx effective measure. i carefully follow your deployment requirements, and actively participate in the three trees campaign. read group, prepared by th

36、e department in the near future of the ideological and political construction of leading cadres in the city reader, read the relevant information, larger harvest, inspired. i think the ability of repelling is to strengthen the partys governing capacity in questions of the construction of meaning, an important topic remains in front of party members and cadres at all levels, we need to further explore and ponder. the ability of repel