本文選題：滑模攤鋪　切入點(diǎn)：基準(zhǔn)線　出處：《長安大學(xué)》2015年碩士論文

【摘要】：公路附屬構(gòu)造物(防護(hù)欄、排水溝、路緣石等)位于公路、橋梁的兩側(cè),起到安全、排水、美化等作用,是現(xiàn)代公路不可或缺的一部分,但滑模攤鋪出的構(gòu)造物存在線型扭曲、麻面及表面溝槽,寒冷地區(qū)甚至出現(xiàn)鹽凍破壞。為改善構(gòu)造物的整體質(zhì)量,以Wirtgen SP250滑模攤鋪機(jī)為研究對象,主要從以下幾個方面進(jìn)行研究:(1)基于公路線型特征,建立基準(zhǔn)掛線的數(shù)學(xué)模型,推導(dǎo)出直線段、彎道段基準(zhǔn)線的允許樁距范圍,并分析滑模攤鋪對攤鋪機(jī)及傳感器的要求。考慮到基準(zhǔn)掛線耗時耗力、精度低,本文探究了非基準(zhǔn)線式3D控制系統(tǒng)作用原理及滑模施工控制流程。(2)通過室內(nèi)試驗來模擬攤鋪機(jī)側(cè)置料斗內(nèi)混凝土振動液化特性,分析單根振搗棒作用下混凝土振動粘度系數(shù)的變化規(guī)律,根據(jù)振動粘度系數(shù)分布規(guī)律,分析三根振搗棒作用下料斗內(nèi)出料口豎直面內(nèi)加速度分布規(guī)律,通過調(diào)整振搗棒的位置及傾角,保證振動粘度系數(shù)在合理范圍,也確保混凝土充分振動液化,避免滑模出現(xiàn)麻面及溜肩。(3)建立混凝土拌合站、運(yùn)輸車、攤鋪機(jī)、皮帶輸料機(jī)間的理論匹配關(guān)系,定量分析每天施工出現(xiàn)的溝槽數(shù)量,通過合理匹配避免表面溝槽出現(xiàn)。針對意外停機(jī)而出現(xiàn)的表面溝槽,設(shè)計液壓卸載控制系統(tǒng)和機(jī)械控制系統(tǒng)來控制滑模模具附著在混凝土上的重量,采用AMEsim軟件對液壓控制系統(tǒng)進(jìn)行仿真分析。針對構(gòu)造物表面裂縫缺陷,分析其原因并給出預(yù)防措施。(4)分析嚴(yán)寒地區(qū)構(gòu)造物鹽凍破壞機(jī)理,根據(jù)原配合比重新設(shè)計并優(yōu)化配合比,并對比分析表面涂強(qiáng)化劑和添加外加劑的混凝土的抗鹽凍效果,可綜合施工影響因素?fù)駜?yōu)選擇。對嚴(yán)寒地區(qū)環(huán)境要素進(jìn)行詳細(xì)分析,選擇合理的施工期及施工時間。
[Abstract]:Highway subsidiary structures (fence, gutter, edge stone, etc.) are located on both sides of the highway and bridge. They play the role of safety, drainage, beautification, etc. They are an indispensable part of modern highway, but the structures spread out by sliding form have linear distortion.Hemp surface and surface grooves, even in cold areas salt freeze damage.In order to improve the overall quality of the structure, taking the Wirtgen SP250 sliding mode paver as the research object, this paper mainly studies the following aspects: 1) based on the characteristics of the highway line, the mathematical model of the datum trailing line is established, and the straight line segment is deduced.The allowable pile distance range of the base line of the bend section is analyzed, and the requirements of sliding form spreading for paver and sensor are analyzed.Considering the time consuming and low precision of the base line, this paper probes into the working principle of the non-base-line 3D control system and the control flow of sliding form construction. The vibration liquefaction characteristics of concrete in the side hopper of the paver are simulated through laboratory tests.The variation law of concrete vibration viscosity coefficient under the action of single vibrating rod is analyzed. According to the distribution law of vibration viscosity coefficient, the law of acceleration distribution in vertical plane of material outlet of hopper under the action of three vibratory ramming bars is analyzed.By adjusting the position and inclination of the vibratory rod to ensure that the vibration viscosity coefficient is within a reasonable range, and to ensure the full vibration liquefaction of the concrete, to avoid the appearance of the slide-form and the slip form, the concrete mixing station, the transport vehicle, the paver are set up.The hydraulic unloading control system and the mechanical control system are designed to control the weight of the sliding mould attached to concrete. The hydraulic control system is simulated by AMEsim software.According to the structure surface crack defect, the reason is analyzed and the preventive measures are given. (4) the mechanism of salt freezing damage of structure in cold area is analyzed. According to the new design of original proportion, the mix proportion is optimized.The environmental factors in severe cold area are analyzed in detail, and reasonable construction period and construction time are chosen.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U417

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