本文選題：盾構(gòu) + 切削�。� 參考：《北京交通大學》2014年碩士論文

【摘要】：隨著各城市地鐵的大量興建,由于地鐵隧道選線及埋深的限制,區(qū)間隧道盾構(gòu)掘進施工時,遭遇橋梁樁基礎(chǔ)、建筑物樁基礎(chǔ)、地下連續(xù)墻等障礙物的幾率越來越大。采用盾構(gòu)機直接切削穿越障礙物具有成本低、節(jié)省工期、避免施工對附近公共交通引起較大干擾等優(yōu)點,在工程施工中逐漸接納。 本論文以蘇州軌道交通2號線盾構(gòu)穿越廣濟橋14根直徑Φ1.0-1.2m的鋼筋混凝土橋樁工程為依托,通過理論分析研究了盾構(gòu)直接切削大直徑樁基時盾構(gòu)機改造中的刀具選型和設(shè)計,并開展了盾構(gòu)切樁現(xiàn)場試驗,通過現(xiàn)場試驗對改造的刀具進行性能驗證和改進優(yōu)化。最終,將改造好的盾構(gòu)機用于切削穿越廣濟橋樁基工程中,工程結(jié)束后對盾構(gòu)機刀具進行了損傷分析,研究其工程應(yīng)用效果。主要得出以下幾點結(jié)論： (1)采用負前角、零后角的雙面刃貝殼刀適用于直接切削鋼筋混凝土樁基。滿足全覆蓋面切樁的臨界凈刀間距為48.7mm。 (2)鋼筋是否被周邊混凝土包裹固定是其能否被有效切斷的關(guān)鍵,因此提出了配置超前貝殼刀以實現(xiàn)分次切筋的切削理念,以利于將鋼筋切斷為合理的長度。 (3)超前貝殼刀有效的保護了鄰近非墊高先行貝殼刀,提高了刀具整體的切削效率和使用壽命,提升了刀具整體的切削能力。 (4)刀具配置方案成功應(yīng)用于工程實踐,表明盾構(gòu)直接切削大直徑鋼筋混凝土樁基是可行的。 本論文的對刀具選型及設(shè)計的研究為蘇州盾構(gòu)切削穿越橋樁工程提供了理論指導和技術(shù)支撐,在工程中應(yīng)用并取得了良好的效果,可為今后類似盾構(gòu)穿越地下障礙物工程提供借鑒。
[Abstract]:With the mass construction of subway in various cities, due to the limitation of subway tunnel route selection and buried depth, the probability of encountered obstacles such as bridge pile foundation, building pile foundation, underground continuous wall and other obstacles in shield tunneling construction of interval tunnel is more and more great. Using shield machine to directly cut through obstacles has the advantages of low cost, saving time limit and avoiding great interference of construction to nearby public transportation, so it is gradually accepted in engineering construction. Based on 14 reinforced concrete piles with diameter 桅 1.0-1.2 m diameter of Guangji Bridge, this paper studies the tool selection and design of shield machine when shield machine is directly cutting large diameter pile foundation by theoretical analysis. The field test of shield cutting pile is carried out, and the performance of the modified tool is verified and optimized by the field test. Finally, the modified shield machine is used in the pile foundation engineering of cutting through Guangji Bridge. After the project is finished, the damage analysis of the shield machine tool is carried out, and the engineering application effect is studied. The main conclusions are as follows: The double-edged shell knife with negative front angle and zero rear angle is suitable for direct cutting reinforced concrete pile foundation. The critical net tool spacing is 48.7 mm. 2) whether the steel bar is fixed by the surrounding concrete is the key to whether it can be effectively cut off. Therefore, the cutting idea of the steel bar with advanced shell knife is put forward to realize the cutting of the steel bar in order to cut the steel bar to a reasonable length. 3) the advanced shell knife effectively protects the adjacent non-cushioned advanced shell knife, improves the cutting efficiency and service life of the tool as a whole, and improves the cutting ability of the tool as a whole. 4) the tool configuration scheme has been successfully applied in engineering practice, which shows that direct cutting of large diameter reinforced concrete pile foundation by shield machine is feasible. The research of tool selection and design in this paper provides theoretical guidance and technical support for Suzhou shield cutting and crossing bridge pile engineering, and has been applied in the project and achieved good results. It can be used for reference for similar shield tunneling underground obstacle engineering in the future.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U455.39

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