Novel bamboo and wood continuous beam prestressing force exertion system

Abstract

A new prestressing system for bamboo and wood continuous beams is suitable for prestressed bamboo and wood beams in the field of civil engineering. It solves the phenomenon of limited beam span and material waste caused by excessive mid-span deflection of bamboo and wooden beams at present. The invention includes a double U-shaped steel backing plate, a bottom steel backing plate, a groove arc steering block, a screw rod, a prestressed tendon, an anchorage and the like. During the specific construction, the prestressed tendons are anchored at the end of the beam, and the position of the prestressed tendons is fixed through the grooved arc-shaped steering block set on the beam to ensure that the steel bars are close to both sides of the beam body, and the steering block is turned up and down by rotating the screw Move, so as to drive the prestressed tendon connected with the steering block and the beam to produce lateral relative displacement to control the application of prestress. In actual processing, the intermediate support can be added according to the specific situation, and the shape of the steering block can be changed to achieve the purpose of remarkable effect, economy and safety.

Description

technical field [0001] The invention is suitable for continuous beams made of prestressed bamboo and wood in the field of civil engineering. Background technique [0002] In actual engineering, when the span of a prestressed simply supported beam exceeds a certain value, the mid-span bending moment value will increase rapidly under load, affecting the normal use of the beam, resulting in a significant increase in the cross-sectional size and self-weight of the beam. In order to reduce consumables and facilitate construction, this patent proposes a prestressed continuous beam. Through the existence of negative bending moment at the fulcrum, the mid-span deflection is reduced, the bending moment line is changed, and the internal force distribution is more reasonable than that of a simply supported beam with the same span. The prestressed tendons used in this system are arranged in the form of external reinforcement. This external reinforcement does not weaken the main beam sec...

AI Technical Summary

Problems solved by technology

[0002] In actual engineering, when the span of the prestressed simply supported beam exceeds a certain value, the mid-span bending moment value will increase rapidly under the action of load, affecting the normal use of the beam, resulting in a significant increase in the cross-sectional size and self-weight of the beam

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