A kind of prestressed concrete and its construction method

Abstract

The invention belongs to the technical field of prestressed concrete, and particularly relates to prestressed concrete and a construction method thereof. The prestressed concrete comprises a prestressed reinforcing steel bar, an epoxy adhesive, concrete and an anchor tool; the epoxy adhesive is positioned on the surface of the prestressed reinforcing steel bar; the prestressed reinforcing steel bar is distributed inside the concrete structure and bonded with the concrete by virtue of the epoxy adhesive into a whole body, and prestress is applied to the concrete by virtue of the anchor tool. Compared with the prior art, a corrugated pipe is not needed, the cross sectional area of a prestressed concrete component is increased, the single-component epoxy adhesive is used as an adhesive material, the adhesion property of a prestressed material and the concrete is remarkably improved, and the stress property of the prestressed concrete component is improved; the harm of the corrosion of the prestressed reinforcing steel bar on the durability of the prestressed concrete component is solved; the grouting is not needed, and the construction process is simplified; the concrete is solidified in an electric heating way, so that the convenience in construction is realized, the efficiency is high, and the quality stability is good.

Description

technical field [0001] The invention belongs to the technical field of prestressed concrete, and in particular relates to a prestressed concrete and a construction method thereof. Background technique [0002] Prestressed concrete structures have been widely used in bridge engineering because of their superior mechanical properties and durability. More than 70% of the world's bridges use prestressed concrete structures. Prestressed construction methods include pre-tensioning and post-tensioning. Pre-tensioning is used for construction. The prefabrication of the beam body can only be carried out on the tensioned pedestal, and the prestressed steel bars can only be arranged in a straight line, so its application is not enough widely. The prestressed system constructed by the post-tensioning method is divided into two types: bonded prestressed system and non-bonded prestressed system according to whether it is bonded to the component or not. The unbonded prestressed system is...

AI Technical Summary

Problems solved by technology

However, most of the prestressed steel bars can only be arranged in multiple bundles, and large-diameter corrugated pipes need to be pre-embedded, which weakens the cross section of the structure, and it is easy to cause grout leakage and blockage of the corrugated pipes during the concrete pouring process, resulting in prestressed steel bars. Rebar cannot be placed

At the same time, after the tensioning of the prestressed tendons is completed, the prestressed pipes must be grouted. In actual operation, it is inevitable that the grouting will not be full, resulting in the following diseases: corrosion of the prestressed tendons and reduction of the mechanical properties of the prestressed tendons Weaken the cooperating ability of prestressed tendons and concrete, etc.; the section of the component is weakened due to the grouting of the bellows is not full; the cement slurry in the bellows seepage is caused by frost heave and many diseases such as cracking of concrete components along the bellows, giving Prestressed members pose greater safety hazard