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在正交地道桥的顶进过程中,一般不会产生较大的左右偏转,而在斜交地道桥,尤其是交角较小的地道桥,在顶进过程中箱体要产生偏转,由于我们对此没有足够的认识,在京郊某铁路交角为51°23′16″的立交桥顶进就位后,箱体前端偏离设计中线540毫米,其间虽经采取一些措施,但均未奏效。以下仅就斜交地道桥在顶进过程中的偏转情况、原因分析、并克服偏转的设想,简述如下: 一、在顶进施工过程中的偏转情况在顶进过程中出现偏转现象,在以往资料上曾有一般介绍,故在事先布置千斤顶位置,有意识地将千斤顶不对称地布置成两组,一组为4台,二组为5台,用以克服其顶进过程中的箱体顺时针方向偏转。箱体平面尺寸及千斤顶位置详图1
Orthogonal Road Bridge in the jacking process, generally do not have a larger left and right deflection, and in the oblique road tunnel, especially the smaller cross-overpass bridge, during the jacking process to produce deflection, as we Without adequate knowledge of this, after the overpass at a railway junction of 51 ° 23’16 "in the suburb of Beijing was put in place, the front of the box deviated from the design center line by 540 mm, although no measures had been taken during this period. Only on skew bridge Road in the process of deflection in the jacking process, the reasons for analysis and to overcome the deflection of the idea, summarized as follows: First, during the construction of the top of the deflection during the jacking process deflection occurs in the past There was a general introduction to the data, so in the prior arrangement of the jack position, the jack is consciously arranged asymmetrically into two groups, a group of 4 units, two units of 5 units to overcome the jacking process of cis Clockwise deflection. Cabinet plane size and jack location details 1