Precast concrete members connected by locking and anchoring pier heads and grouting variable diameter sleeve, prefabricated concrete member and manufacturing method of prefabricated concrete member

Abstract

The invention provides precast concrete members connected by locking and anchoring pier heads and grouting a variable diameter sleeve, a prefabricated concrete member and a manufacturing method of the prefabricated concrete member, belonging to the technical field of prefabricated concrete structures in architectural engineering. A sleeve connection method for transferring forces based on extrusion and bonding is adopted, a pier head (5) and a pier head (6) are processed at the two ends of rebars, one end of a connecting sleeve (7) adopts the sleeve inner diameter smaller than the outer diameter of the rebar pier head (6) at the corresponding end, a plugging ring (10) with an inner diameter smaller than the outer diameter of the rebar pier head (5) at the corresponding end is adopted at the other end of the connecting sleeve, and the rebars transfer forces by utilizing locking and anchoring extrusion and bonding among the pier heads, the plugging ring, the grouting materials and the sleeve through sleeve grouting, thus changing the previous mode that the pull of the rebars of the precast concrete members connected through grouting is mainly transferred through bonding. The safety and economy of connection of the novel precast concrete members are improved to some extent.

Description

technical field [0001] The invention relates to a steel bar connection structure applied to prefabricated concrete components. The two ends of the steel bar are pier thickened, and one end of the sleeve adopts a sleeve inner diameter smaller than the outer diameter of the steel bar pier head at the corresponding end. The pier head is locked and put into the sleeve The other end of the cylinder adopts a blocking ring with an inner diameter smaller than the outer diameter of the steel bar pier head at the corresponding end, locks the pier head, and grouts through the sleeve, so that the steel bar is squeezed by the locking anchor between the pier head, the blocking ring, the grouting material and the sleeve It has changed the way that the tension of the steel bars of prefabricated components connected by grouting is mainly transmitted through bonding. The prefabricated components are connected by post-pouring belts, so that the connection of the new prefabricated concrete compon...

AI Technical Summary

Problems solved by technology

The tensile force of the connecting steel bar is transmitted to the grouting material through shearing force, and then to the interface between the grouting material and the surrounding sleeve, bellows or concrete through the shearing force, mainly relying on the bonding force transmission, and the reliability is not high; Relying on bonded force transmission, the length and diameter of the sleeve, bellows or hole will be relatively large, resulting in a large amount of steel and high cost; due to the relatively large volume of the sleeve, bellows or hole, the special grouting material used The amount is also large, and its durability has not been fully verified, and has not withstood the test of actual earthquakes; the gaps usually reserved between vertically connected prefabricated components are small, and there is a problem that the grouting cannot fill the gaps, resulting in The joint surface is easy to crack and damage under the action of horizontal load, and the building will collapse continuously, which will cause serious loss of life and property

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