【摘要】：隨著基坑內(nèi)支撐梁拆除技術(shù)的發(fā)展,人們對于拆除技術(shù)的環(huán)保要求也越來越高,低噪音、低粉塵、拆除效率高的綠色施工工藝越來越受到土木行業(yè)的青睞。軟土地區(qū)深基坑內(nèi)鋼筋混凝土支撐梁在拆除過程中的噪音、粉塵等會對環(huán)境造成很大影響,阻礙了綠色施工技術(shù)的實(shí)施,同時(shí)也增加了施工成本、施工工期和安全隱患。為減少上述各種因素的影響,本文提出一種新的靜爆破碎法,即在混凝土支撐梁施工時(shí),預(yù)設(shè)一定直徑的孔洞,然后使用破碎劑將內(nèi)支撐梁靜爆破碎。經(jīng)試驗(yàn)并在工程中應(yīng)用,支撐梁在灌藥后的預(yù)設(shè)時(shí)間內(nèi)剛性整體基本被破碎完成,便于后期輕易拆除。該技術(shù)大大節(jié)約了成本,縮短了拆除的施工工期,施工工藝簡單,便于推廣應(yīng)用。本文提出的新型靜態(tài)爆破技術(shù)中要在鋼筋混凝土內(nèi)支撐梁上布置均勻的孔洞,用來作為后期的爆破灌藥孔,關(guān)于孔洞對于梁整體的受力性能的影響則需要使用ABAQUS有限元軟件進(jìn)行模擬。本文截取內(nèi)支撐群梁中的一榀梁作為研究對象,在軟件中建立帶孔梁模型,在梁的端部施加固定約束,于梁頂部施加均布荷載,待鋼筋混凝土梁中的鋼筋達(dá)到屈服,運(yùn)算結(jié)束。通過分析模型梁的荷載位移曲線,確定其新的承載能力。
[Abstract]:With the development of the technology of removing the supporting beam in the foundation pit, the green construction technology with low noise, low dust and high removal efficiency is more and more popular in the civil engineering industry. The noise and dust of reinforced concrete bracing beam in deep foundation pit in soft soil area will have a great impact on the environment and hinder the implementation of green construction technology. At the same time, the construction cost, construction time limit and hidden danger of safety will be increased. In order to reduce the influence of the above factors, a new method of static blasting breakage is proposed in this paper, in which the holes with a certain diameter are preset during the construction of the concrete supporting beam, and then the inner bracing beam is broken by the crushing agent. After test and application in the project, the rigid whole of the support beam is basically broken and completed in the preset time after pouring, which is easy to remove in the later stage. This technology greatly saves the cost, shortens the construction period of demolition, and the construction technology is simple and easy to be popularized and applied. In the new static blasting technology proposed in this paper, uniform holes should be arranged on the reinforced concrete inner bracing beam to be used as blasting charge holes in the later stage of blasting. The influence of the hole on the mechanical behavior of the whole beam needs to be simulated by ABAQUS finite element software. In this paper, a beam in a group of beams with inner braces is taken as the research object. A model of a beam with holes is established in the software, and a fixed constraint is imposed on the end of the beam, and a uniform load is applied on the top of the beam. When the steel bar in the reinforced concrete beam reaches yield, the calculation is completed. The new load-bearing capacity of the model beam is determined by analyzing the load-displacement curve of the model beam.
【學(xué)位授予單位】：浙江海洋大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU746.5

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