本文選題：筏板基礎 + 大體積混凝土��； 參考：《大連理工大學》2013年碩士論文

【摘要】：齊齊哈爾市高新園區(qū)科技研發(fā)中心項目的基礎形式為大體積混凝土筏板基礎,公司中標該工程后,筏板基礎大體積混凝土的施工裂縫控制成為首要任務之一。在查閱了大量國內外相關參考文獻后,本文對筏板基礎大體積混凝土施工裂縫控制進行了歸納總結,針對該工程筏板混凝土的自身特點,選擇經濟、合理、實用的措施有針對性的實施于施工過程當中,并在施工過程中通過測溫儀器對混凝土中溫度進行了監(jiān)控,針對數(shù)據(jù)分析制定和調整控溫措施,圓滿解決了該工大體積混凝土施工裂縫控制問題。 近些年在高層建筑中,大體積混凝土筏板基礎被廣泛應用。由于與普通的混凝土構件相比,大體積混凝土施工時內部水泥水化熱相當大并且混凝土的導熱性也不佳,對于大體積混凝土施工,稍有控制不慎即有可能因此出現(xiàn)裂縫。這些裂縫可分為表面裂縫和貫穿裂縫,它的引起可能是設計、材料、施工等多方面因素造成的。由于筏板基礎多處于地下水位以下或潮濕環(huán)境,裂縫一旦產生,水和一些酸堿性物質就會沿裂縫滲透,造成鋼筋的銹蝕,引起混凝土產生滲漏,進而引起整個基礎的強度降低,影響建筑物的使用功能和耐久性。所以,筏板基礎大體積混凝土在施工中必須考慮裂縫控制。 本文對筏板大體積混凝土的施工裂縫控制進行的研究,主要包括以下幾個方面： (1)在參考文獻的基礎上,歸納總結了筏板基礎大體積混凝土裂縫的分類、產生機理與控制措施,歸納了表面收縮裂縫、溫度裂縫控制措施。根據(jù)前人經驗,擬定了在齊齊哈爾市高新園區(qū)科技研發(fā)中心項目筏板基礎中所采取的裂縫控制措施。 (2)應用有限元軟件,筏板混凝土內部溫度進行仿真模擬和分析,通過模型中其溫度的發(fā)展趨勢以及溫度場的分布情況,制定專門的控溫措施。 (3)針對工程特點、參考文獻、仿真分析結果,制定了該工程筏板大體積混凝土基礎專項施工方案。 (4)施工中對混凝土內部溫度發(fā)展進行監(jiān)測,對監(jiān)測數(shù)據(jù)進行了對比分析。包括與仿真模型的對比,溫度曲線與規(guī)范要求限值的對比,以及對引起數(shù)值偏差較大的施工措施改進方法。
[Abstract]:The foundation form of science and technology research and development center project of Qiqihar high-tech park is mass concrete raft foundation. After winning the bid for the project, the construction crack control of raft foundation mass concrete becomes the most important Ren Wuzhi. After consulting a large number of references at home and abroad, this paper sums up the crack control of the raft foundation mass concrete construction, according to the characteristics of the raft concrete, the selection of economic, reasonable, The practical measures are carried out in the construction process, and the temperature in the concrete is monitored by the temperature measuring instrument during the construction, and the temperature control measures are formulated and adjusted according to the data analysis. The problem of crack control in large volume concrete construction is solved successfully. In recent years, mass concrete raft foundation has been widely used in high-rise buildings. Compared with ordinary concrete members, the internal hydration heat of cement is quite large and the thermal conductivity of concrete is not good when mass concrete is constructed, so it is possible to cause cracks in mass concrete construction if it is controlled carelessly. These cracks can be divided into surface cracks and penetrating cracks, which may be caused by many factors, such as design, material, construction and so on. As the raft foundation is mostly located below the groundwater level or in a humid environment, once the cracks are formed, water and some acid and alkaline substances will permeate along the cracks, resulting in the corrosion of steel bars, resulting in leakage of concrete, and then causing the strength of the whole foundation to be reduced. Affect the use and durability of buildings. Therefore, crack control must be considered in mass concrete construction of raft foundation. In this paper, the construction crack control of raft slab mass concrete is studied, including the following aspects: 1) on the basis of reference, the classification, mechanism and control measures of mass concrete cracks in raft foundation are summarized, and the control measures of surface shrinkage cracks and temperature cracks are summarized. According to the previous experience, the crack control measures adopted in the raft foundation of the R & D center project of Qiqihar Hi-tech Park are drawn up. 2) the finite element software is used to simulate and analyze the internal temperature of raft concrete. Through the development trend of temperature and the distribution of temperature field in the model, special temperature control measures are worked out. 3) according to the characteristics of the project, the special construction scheme of the raft slab mass concrete foundation is established with reference to the literature and the result of simulation analysis. During construction, the temperature development of concrete is monitored, and the monitoring data are compared and analyzed. It includes the comparison with the simulation model, the comparison between the temperature curve and the limit value required by the code, and the improvement methods for the construction measures which cause the large numerical deviation.
【學位授予單位】：大連理工大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU755.7

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本文編號：1850324