浅谈预应力混凝土箱梁张拉技术

Talking about the Tension Technology of Prestressed Concrete Box Beam

数控智能张拉设备是目前高架桥现浇简支梁、连续梁、连续刚构预应力筋进行张拉的新型设备,施工现场具备经批准的张拉程序和现场施工说明书,张拉应力控制符合设计要求,张拉期间,千斤顶的张拉作用线与轴线相重合,同时以伸长值进行校核,实际伸长值与理论伸长值的差值控制在±6%以内。经过简支梁底板、腹板、顶板分阶段施加预应力实验数据,得出不同断面的伸长量,因此对比传统张拉技术,智能张拉技术同步精确率较高。

CNC intelligent tensioning equipment is a new type of equipment for tension of cast-in-situ simply supported beam,continuous beam and continuous rigid frame prestressed reinforcement of viaduct.The construction site has approved tensioning procedures and field construction instructions,and the tension stress control meets the design requirements.During the tensioning period,the tension action line of the jack coincides with the axis,and the elongation value is checked.The difference between the actual elongation value and the theoretical elongation value is controlled within±6%.Through the experimental data of simply supported beam bottom plate,web plate and roof by stages,the elongation of different sections is obtained.Therefore,compared with the traditional tensioning technology,the synchronous accuracy of intelligent tensioning technology is higher.