【摘要】：隨著現(xiàn)澆混凝土模板工程的不斷發(fā)展，新型模板材料及模板形式日益增多，如普通膠合板、鋼框膠合板、全鋼大模板等，其中以木質(zhì)膠合板的應(yīng)用最為廣泛。但是，木材的大量使用，并不符合國家可持續(xù)發(fā)展的戰(zhàn)略，因此，采用新材料取代膠合板成為模板行業(yè)發(fā)展的必然趨勢。新型PVC復(fù)合塑料模板采用廢舊PVC塑料及木粉為生產(chǎn)原料，板材采用擠出成型，制作工藝簡單，模板循環(huán)利用次數(shù)高，可回收利用，性價比較高，在新型模板中占據(jù)優(yōu)勢地位。 本文在總結(jié)國內(nèi)外新型模板研究及應(yīng)用的基礎(chǔ)上，通過大量的試驗，對特定配方下的PVC基復(fù)合塑料模板的材料性能及模板的工作性能做了充分的研究，為新型模板工程的應(yīng)用及推廣提供了理論基礎(chǔ)，本文的主要研究成果如下： (1)根據(jù)塑料制品及模板的相關(guān)規(guī)范，對PVC復(fù)合塑料模板材料進行了拉伸性能及彎曲性能試驗研究，確定了同一種材料在不同試驗方式下的強度及彈性模量，并根據(jù)已有的本構(gòu)模型，結(jié)合試驗數(shù)據(jù)，提出了特定配方下PVC基復(fù)合塑料模板材料的拉伸及彎曲本構(gòu)方程。結(jié)果表明，同一種PVC復(fù)合塑料模板材料，其在不同受力狀態(tài)下的本構(gòu)方程雖然存在一定的相關(guān)性，，但不是重合的。 (2)在常溫狀態(tài)下，對不同間距支撐的PVC復(fù)合塑料模板進行模擬施工加載試驗，通過數(shù)據(jù)分析獲得了能夠使材料不發(fā)生殘余變形的最大荷載，在支撐間距為200mm，250mm，300mm時，模板不發(fā)生殘余變形的最大荷載分別為6kN/m2，6kN/m2，5kN/m2。 (3)研究了PVC復(fù)合塑料模板在溫度和荷載綜合作用下的反應(yīng)，在5kN/m2的荷載作用下，進行模板的逐級升溫降溫循環(huán)試驗，得出了模板在熱力綜合作用下不發(fā)生殘余變形的最大溫度，在支撐間距為200mm時，該模板不發(fā)生殘余變形的最大安全溫度為60℃。 (4)根據(jù)PVC復(fù)合塑料模板在實際工程應(yīng)用中出現(xiàn)的熱變形累積現(xiàn)象及模板的熱力耦合試驗結(jié)果，分析討論了處理的模板熱變形累積問題的方法。
[Abstract]:With the continuous development of cast-in-place concrete formwork engineering, the new formwork materials and formwork are increasing, such as common plywood, steel frame plywood and all steel large formwork, among which wood plywood is the most widely used. However, the large use of wood does not conform to the strategy of sustainable development of the country, so the new material is used to replace the glue. Plywood has become an inevitable trend in the development of template industry. The new PVC composite plastic template is made of waste PVC plastic and wood powder as the raw material. The plate is extruded by extrusion molding. The manufacturing process is simple, the cycle use times of the template are high, and the performance price ratio is high, and it occupies the dominant position in the new type of formwork.
On the basis of summarizing the research and application of new formwork at home and abroad, through a large number of experiments, the material properties and working performance of the PVC based composite plastic formwork under specific formula are fully studied. The theoretical foundation is provided for the application and popularization of the new template engineering. The main research results of this paper are as follows:
(1) according to the relevant specifications of plastic products and formwork, the tensile properties and bending properties of PVC composite plastic formwork materials were tested. The strength and modulus of elasticity of the same material under different test modes were determined. According to the existing constitutive model and the experimental data, the PVC based composite plastic template under specific formula was put forward. The tensile and bending constitutive equations of the material show that the constitutive equation of the same PVC composite plastic template has a certain correlation in different stress states, but it is not a coincidence.
(2) under the normal temperature state, the simulated construction loading test of PVC composite plastic template with different spacing support is carried out. The maximum load that can make the material without residual deformation is obtained by data analysis. The maximum load of the template without residual deformation is 6kN/m2,6kN/m2,5kN/m2. when the support spacing is 200mm, 250mm, and 300mm.
(3) the reaction of PVC composite plastic formwork under the comprehensive effect of temperature and load was studied. Under the load of 5kN/m2, the cycle test of step by step temperature drop of the template was carried out, and the maximum temperature of the formwork without residual deformation was obtained under the comprehensive thermodynamic effect. The maximum safety of the formwork without residual deformation when the support spacing was 200mm was obtained. The temperature is 60 degrees centigrade.
(4) according to the thermal deformation accumulation in the practical engineering application of PVC composite plastic template and the thermal coupling test result of the template, the method of the heat deformation accumulation of the treated template is analyzed and discussed.
【學(xué)位授予單位】：青島理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU755.2

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