Concrete contact network strut of railway electrification engineering and preparation method thereof

Abstract

The invention discloses a concrete contact network strut of railway electrification engineering, which is prepared from 685-760 parts of portland cement, 170-200 parts of silicon powder, 1,100-1,190 parts of quartz sand, 13-15 parts of high efficiency water reducing agent , 165-190 parts of water and 90-150 parts of brass-coated steel fiber, wherein the average grain diameter of the silicon powder is 0.3mu m; the content of SiO2 in the silicon powder is more than or equal to 92 percent; the grain diameter of the quartz sand is 0.16-1.25mm; and the diameter of the brass-coated steel fiber is 0.18-0.25mm and the length of the brass-coated steel fiber is 11-15mm. The concrete contact network strut is prepared by the following steps: adding steel fiber and quartz sand into a stirrer; then adding cement and the silicon powder and 30 percent of water; finally adding the balance of water and the high efficiency water reducing agent for uniformly stirring to obtain a mixed material; pouring the mixed material into a die equipped with a prestressed steel reinforcement cage; vibrating or centrifugally forming the mixed material; placing a finished product and the die into steam of 75-95DEG C to cure for 48h and demoulding; and obtaining the finished product. The cracking bending moment is 120-300kN.m, the pressure resistance of concrete is over 200MPa and the impermeability is more than P16.

Description

technical field [0001] The invention relates to a cross-web rod type catenary support and an annular prestressed concrete catenary support used in railway electrification engineering. The invention also relates to a method for the preparation of said struts. Background technique [0002] At present, with the transformation of railway electrification projects and the speed up of trains, the quality requirements for railway power catenary pillars are getting higher and higher. High durability, high bearing capacity transformation. Due to the influence of the mechanical properties of the material, the existing catenary pillar can only increase its load resistance capacity by increasing the amount of steel, but the standard bending moment is only 200Kn.m, while the Φ350 ring pillar is only 140Kn.m. And in actual production, because the steel bars are too dense, it is very difficult to pour concrete, the product quality is not easy to control, the pass rate is low, the producti...

AI Technical Summary

Problems solved by technology

Due to the influence of the mechanical properties of the material, the existing catenary pillar can only increase its load resistance capacity by increasing the amount of steel, but the standard bending moment is only 200Kn.m, while the Φ350 ring pillar is only 140Kn.m

And in actual production, because the steel bars are too dense, it is very difficult to pour concrete, the product quality is not easy to control, the pass rate is low, the production efficiency is not high, and it is difficult to meet the batch demand for pillars during railway construction. Resistance to high cold, high alkali and high sulfate has little effect, the product has a large weight, high maintenance costs during project operation, and poor durability