本文選題：變截面移動(dòng)模架 + 受力分析��； 參考：《長安大學(xué)》2015年碩士論文

【摘要】：移動(dòng)模架工法施工優(yōu)點(diǎn)突出,如標(biāo)準(zhǔn)化操作后期容易熟練操作、施工循環(huán)時(shí)間短,箱梁結(jié)構(gòu)整體性好,重復(fù)利用率高、經(jīng)濟(jì)合理,對(duì)地基要求低,對(duì)橋下通航以及通車影響較小等等,移動(dòng)模架工法的廣泛應(yīng)用得益于以上諸多優(yōu)勢(shì),尤其在城市高架、高墩橋梁的施工中更能體現(xiàn)其突出于其它工藝的優(yōu)勢(shì)。但是,就當(dāng)前的工程實(shí)踐而言,移動(dòng)模架工法在受力、經(jīng)濟(jì)性、施工工藝、施工監(jiān)測(cè)方面仍然存在諸多不足,以變截面移動(dòng)模架施工工藝的問題上尤為突出。另外,移動(dòng)模架施工中也出現(xiàn)過重大安全事故,這些問題嚴(yán)重制約了移動(dòng)模架在中小跨徑大長橋施工中的推廣和應(yīng)用。本文針對(duì)移動(dòng)模架工法的應(yīng)用現(xiàn)狀,以泉州灣跨海大橋?yàn)楣こ瘫尘?圍繞“移動(dòng)模架的受力分析、施工關(guān)鍵技術(shù)及施工監(jiān)測(cè)”,通過搜集整理大量的文獻(xiàn)資料,對(duì)移動(dòng)模架工法特點(diǎn)及適用性,仿真模擬,施工工藝及關(guān)鍵技術(shù),施工監(jiān)測(cè)等等一些問題進(jìn)行相關(guān)研究,通過學(xué)習(xí)研究,獲得一些有實(shí)際意義的結(jié)論與創(chuàng)新:(1)在既有移動(dòng)模架的設(shè)計(jì)、工程應(yīng)用的基礎(chǔ)之上,做了關(guān)于移動(dòng)模架工法的構(gòu)造形式、特點(diǎn)、適用性以及與其它工法優(yōu)勢(shì)的對(duì)比。提出了應(yīng)用移動(dòng)模架施工的箱梁橋施工的橋梁的設(shè)計(jì)要求和移動(dòng)模架工法施工的合理性。(2)結(jié)合鋼結(jié)構(gòu)相關(guān)設(shè)計(jì)理論和有關(guān)規(guī)范,運(yùn)用有限元軟件MIDAS CIVIL對(duì)移動(dòng)模架主要受力結(jié)構(gòu)主梁、鼻梁、牛腿進(jìn)行了仿真分析計(jì)算,得到結(jié)論:牛腿及其增設(shè)的支架系統(tǒng)應(yīng)力較為集中,比較靠近Q345鋼材的設(shè)計(jì)應(yīng)力,預(yù)示到這些部位的鋼材在最不利荷載作用下容易趨向于塑性工作狀態(tài)。主梁在澆筑狀態(tài)、鼻梁在行走狀態(tài)過程中構(gòu)件應(yīng)力儲(chǔ)備較大,滿足設(shè)計(jì)要求。(3)通過其施工工藝流程和步驟、等截面與變截面移動(dòng)模架施工工法在主體結(jié)構(gòu)及流程上的對(duì)比,移動(dòng)模架的拼裝、調(diào)試,模架主體結(jié)構(gòu)調(diào)整難點(diǎn),混凝土澆筑順序等關(guān)鍵技術(shù)進(jìn)行研究,提出了移動(dòng)模架施工橋梁新舊混凝土結(jié)合部的錯(cuò)臺(tái)防制措施。并對(duì)漸變段施工模架結(jié)構(gòu)的安全控制和主梁的線形控制等技術(shù)難題做了總結(jié)。(4)論述了移動(dòng)模架的施工監(jiān)測(cè),主要是對(duì)移動(dòng)模架應(yīng)力、梁體線形監(jiān)測(cè)做了詳細(xì)研究,針對(duì)移動(dòng)模架在行走狀態(tài)和梁體混凝土澆筑狀態(tài)過程中模架關(guān)鍵監(jiān)測(cè)部位的應(yīng)力值,混凝土澆筑狀態(tài)的梁體高程與理論計(jì)算值進(jìn)行對(duì)比,推斷其在工程實(shí)踐中的安全儲(chǔ)備,評(píng)估其工作性能,為移動(dòng)模架法在實(shí)際施工中提供預(yù)警及安全保障。
[Abstract]:The construction method of moving mould frame has outstanding advantages, such as easy and skilled operation in the later stage of standardized operation, short construction cycle time, good integrity of box girder structure, high reuse rate, reasonable economy and low requirement for foundation. The wide application of the method of moving mould frame can benefit from the advantages above, especially in the construction of urban elevated bridge and high pier bridge. However, as far as the current engineering practice is concerned, there are still many deficiencies in the construction technology, such as force, economy, construction technology and construction monitoring, especially in the construction technology of variable cross section moving die frame. In addition, there have been major safety accidents in the construction of the movable formwork frame, which seriously restricts the popularization and application of the mobile formwork frame in the construction of medium and small span long bridge. In view of the present situation of the application of the moving mould frame method, taking Quanzhou Bay Bridge across the sea as the engineering background, this paper focuses on the "force analysis, key construction technology and construction monitoring of the moving mould frame", and through collecting and sorting out a large number of documents and materials. The characteristics and applicability, simulation, construction technology and key technology, construction monitoring and so on are studied. On the basis of the design and engineering application of the existing mobile die frame, this paper makes a comparison of the construction form, characteristics, applicability and advantages with other methods. The design requirements of the bridge in the construction of the box girder bridge by using the moving formwork frame and the rationality of the construction of the moving formwork frame are put forward, combining with the relevant design theory of the steel structure and the relevant specifications. The finite element software MIDAS CIVIL is used to simulate and calculate the main beam, nose beam and leg of the main force structure of the moving mould frame. The conclusion is that the stress of the leg and its additional support system is relatively concentrated, which is close to the design stress of Q345 steel. It indicates that the steels in these parts tend to work in plastic state under the most unfavorable load. In the pouring state of the main beam, the stress reserve of the members of the nose beam in the course of walking is large, which meets the design requirements. Through its construction process and steps, the construction method of the moving die frame with equal section and variable section is compared in the main structure and the flow. The key technologies such as assembling, debugging, adjusting the main structure of the mould frame, and the pouring sequence of concrete are studied, and the measures of preventing and controlling the new and old concrete joint of the new and old concrete in the construction of the moving mould frame are put forward. In addition, the paper summarizes the technical problems such as the safety control of the construction die frame structure and the linear control of the main beam, and discusses the construction monitoring of the moving die frame, which mainly studies the stress of the moving die frame and the monitoring of the line shape of the beam body in detail. According to the stress value of the key monitoring part of the mould frame in the walking state and the concrete pouring state of the beam, the height of the beam body in the concrete pouring state is compared with the theoretical calculation value, and its safety reserve in engineering practice is inferred. Its working performance is evaluated to provide early warning and safety guarantee for moving mould frame method in actual construction.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U448.213;U445.463

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