Novel template-free anti-corrosion UHPC-NC combined bearing platform and construction method thereof

Abstract

The invention discloses a novel template-free anti-corrosion ultra-high performance concrete (UHPC)-normal concrete (NC) bearing platform and a construction method thereof. The combined bearing platform comprises a prefabricated UHPC protective layer and a cast-in-place core common concrete part; the prefabricated UHPC protective layer specifically comprises a prefabricated UHPC protective layer and a prefabricated UHPC protective layer, a UHPC bearing platform bottom plate, a bottom plate reserved groove, a bottom plate reserved round hole, a bottom plate reserved pile hole, a prefabricated UHPC side plate I, a prefabricated UHPC side plate II, a side plate reserved through hole, a prefabricated UHPC bearing platform top plate, a top plate reserved groove, a top plate reserved through round hole, a top plate reserved column hole and full-thread screws; the prefabricated UHPC top plate, the side plates and the bottom plate are connected through the full-thread screws, and bar-plantingglue is injected; coarse-aggregate-free UHPC is cast in place at the top plate for hole sealing; before the top plate is covered, a bearing platform reinforcement cage is placed in a space formed by the prefabricated UHPC protective layer, and the normal concrete is cast in place. The prefabricated UHPC protective layer not only can prevent the bearing platform from being corroded, but also can play a role of a template, so that the cost is reduced, and the on-site construction workload is reduced.

Description

technical field [0001] The present invention relates to the field of building technology, in particular to a new formwork-free anti-corrosion ultra-high performance reactive powder concrete (UHPC)-ordinary concrete (NC) suitable for areas with strong corrosive and humid geological conditions such as saline-alkali areas and freeze-thaw areas. ) bearing platform and its construction method. Background technique [0002] The power transmission and transformation project of the State Grid of Gansu Province is located in the highly corrosive saline soil area of ​​the Hexi Corridor. The groundwater contains a large amount of sulfate ions and chloride ions, which will corrode the reinforced concrete pile foundation. Coupled with the obvious alternating action of freeze-thaw and dry-wet, the volume of free water in concrete expands after being frozen, and stress is generated inside the concrete. Due to repeated actions, the internal stress exceeds the tensile strength of the concret...

AI Technical Summary

Problems solved by technology

Under the action of corrosion and freezing and thawing, sometimes the tower will tilt or even collapse, seriously affecting the safety and normal operation of power transmission and transformation lines

At present, for the anti-corrosion of concrete foundation, the coating protection method, cathodic protection measures, high-performance and polymer concrete and other measures commonly used in engineering have obvious deficiencies so that the effect is not good.

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