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在后张法预应力混凝土连续梁桥施工中,大多采用波纹管制孔,并取得了不少经验,但是,传统的波纹管制孔尚有一些待解决的问题,如波纹管刚性较差,容易上浮和跑位;波纹管漏浆则造成堵孔,用通孔器通孔效果不理想,等等。因此,我们改用波纹管加芯成孔工艺,经过不断改进,取得了很好的效果。 波纹管加芯成孔,就是在待浇筑梁的波纹管中穿入特制的芯棒,然后浇注混凝土,达到成孔的目的。操作时应注意:芯棒可用胶质棒和钢管,其直径应比波纹管的内径小5mm,对于直线孔道,宜用钢管作芯棒,有弯的孔道则用胶质芯棒,但胶质芯棒要有足够的硬度和弯曲能力;芯棒应穿入已浇混凝土段管内0.5～1.0m,混
In the post-tensioning method of prestressed concrete continuous girder bridge construction, most of the use of corrugated pipe hole, and has gained a lot of experience, but the traditional corrugated pipe hole there are some problems to be solved, such as corrugated pipe less rigid, easy to float And running; bellows leakage caused by blocking holes, holes with through-hole effect is not satisfactory, and so on. Therefore, we use corrugated pipe core into a hole process, through continuous improvement, and achieved good results. Corrugated core into a hole, that is, to be poured into the beam of corrugated pipe into the special mandrel, and then pouring concrete, to achieve the purpose of forming holes. Operation should pay attention to: the mandrel can be used plastic rods and steel pipe, the diameter of the corrugated pipe should be smaller than the inner diameter 5mm, for straight hole, pipe should be used as mandrel, curved hole is the use of plastic mandrel, but the gum Mandrel to have sufficient hardness and bending ability; mandrel should be poured into the concrete pipe has been poured 0.5 ~ 1.0m, mixed