Construction method for equilibrium configuration fabricated prestressed concrete girder

Abstract

The invention discloses an equilibrium-configuration construction plan used for manufacturing. .The invention is characterized in that the principle of virtual work and the equilibrium-configuration concept of engineering material mechanics are adopted as a theory base; the construction for a prestressed concrete beam chooses a lateral position, and a finished beam is side-turned by 90-degree to be designed position; a common steel bar framework is side-turned by 90-degree and is colligated between brackets of a fixing-end mould, and a mirror symmetry state is formed between any two steel bar frameworks; a prestressed strand is combined with a support structure for the equilibrium-configuration, and a smaller force applies work through a vertically-tensioned device for a work accumulation to lead the prestressed strand to be distorted and to get the designed stress simultaneously, so as to simplify the construction equipment and process. When in construction, the strain and the pressure of the prestressed strand belong to the system internal force of the equilibrium-configuration so as to save and counteract the contrary force cost. And measuring the distortion degree and the vibration frequency of the prestressed strand guarantees that the stress of the prestressed strand conforms to the design and calculation, so as to prohibit accidents. With the plan, the same equipments can be used for the constructing prestressed concrete beam of diverse types, and the invention is suitable for a scale manufacture and a small construction at site. And the use of pre-tensioned prestressed concrete beams for a span beyond of 20 meters can be promoted by the invention.

Description

Technical field: [0001] The invention belongs to the technical field of building structural components, in particular to a construction method for manufacturing prestressed concrete beams with a balanced configuration. Background technique: [0002] In the prior art, the construction method of the prestressed concrete member all stretches the prestressed bundle (steel bar) along the longitudinal direction, and the tensioning equipment is mainly composed of jacks, connecting oil pipes and oil pumps. The construction technology is to directly use the tensioning machine and control the tension force by the reading of the pressure gauge. Whether it is the tensioning of building structures, or the tensioning of various bridges and special structures, most of them adopt this tensioning process, and there are some defects. , such as: ①Complicated equipment, different varieties, and imperfect supporting facilities; ②The calibration error of the tension gauge and the reading error of...

AI Technical Summary

Problems solved by technology

The construction technology is to directly use the tensioning machine and control the tension force by the reading of the pressure gauge. Whether it is the tensioning of building structures, or the tensioning of various bridges and special structures, most of them adopt this tensioning process, and there are some defects. , such as: ①Complicated equipment, different varieties, and imperfect supporting facilities; ②The calibration error of the tension gauge and the reading error of the pressure gauge are relatively large, the reading is unstable, and the measurement of the tension elongation value is inaccurate; ③The pressure control The control error is large, the resolution is low, and it is difficult to accurately control the tension; ④ There is no comparison of redundant observation data, and the reliability of prestress tension is poor, that is, the tension precision is out of control. If the arch is too large, transverse cracks will appear, and even the prestressed beam (steel bar) will break, causing accidents such as failure, destruction of the prestressed structure and huge loss of life and property. ⑤The construction is difficult, the production cost is high, and the efficiency is low

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