Method for constructing fully prefabricated floor slab partially-overlapped joint and component of joint

Abstract

The invention relates to a method for constructing a fully prefabricated floor slab partially-overlapped joint and a component of the joint. Dovetail grooves with the wide interiors and the narrow exteriors are arranged on the upper edge of a fully prefabricated floor slab, a shear bolt nail is arranged on a steel beam of a main structure, a long strip-shaped field additional truss steel bar withleft and right clamping convexes is longitudinally arranged on the shear bolt nail in a welded mode, the dovetail grooves comprise rib-out dovetail grooves and non-rib-out dovetail grooves which are arranged at intervals, the field additional steel bars are welded in the relatively-grouped rib-out dovetail grooves, and structural shear steel bar frames are welded in the relatively-grouped non-rib-out dovetail grooves. The constructed joint is an integral structure with multiple built-in trusses so that longitudinal, transverse and vertical displacement movement of the fully prefabricated floorslab can be effectively prevented, splicing is reliable, the service life is long, the joint has the effect that cannot be realized through an existing joint constructed through an overlapped cast-in-place method, the novel method is scientific and reasonable, simple in structure, low in cost, and easy to popularize and implement, and has strong practicability.

Description

technical field [0001] The invention relates to the technical field of infrastructure construction, in particular to a method for constructing partial superimposed joints of fully prefabricated floor slabs and components thereof. Background technique [0002] In infrastructure construction, splicing fully prefabricated floor slabs is an important basic construction content. At present, there are two main joint construction methods: one is the sealant filling method, which is characterized in that the prefabricated floor slabs do not have tendons in the joint area. , directly filled with sealant, which has the characteristics of convenient and quick construction, but there is only an adjacent splicing and overlapping relationship between the two prefabricated slabs, and there is no mutual limit relationship, which is prone to relative displacement of the prefabricated slabs, resulting in the risk of joint failure The second is the superimposed cast-in-place method, which is c...

AI Technical Summary

Problems solved by technology

[0002] In infrastructure construction, splicing fully prefabricated floor slabs is an important basic construction content. At present, there are two commonly used joint construction methods: one is the sealant filling method, which is characterized in that the prefabricated floor slabs do not have tendons in the joint area. , directly filled with sealant, which has the characteristics of convenient and quick construction, but there is only an adjacent splicing and overlapping relationship between the two prefabricated slabs, and there is no mutual limit relationship, which is prone to relative displacement of the prefabricated slabs, resulting in the risk of joint failure The second is the superimposed cast-in-place method, which is characterized in that the prefabricated floor has ribs (commonly known as beard tendons) in the joint area, and a strip-shaped superimposed cast-in-place layer with a thickness of about 60mm is reserved. Reinforcement, then pouring to form a splicing whole, bound and interconnected by horizontal steel bars, forming a splicing joint with left and right traction, longitudinal limit, and concrete filling limit. The splicing reliability is obviously better than the sealant filling method, so it is currently more popular

However, with the passage of practice time, it was gradually discovered that the on-site steel bar binding workload was large, the construction period was unfavorable, the cost was high, and the reliable working life of the joints thus constructed was generally not long. After repeated research, it was found that, The binding and interconnection of horizontal steel bars produces the effects of left and right traction and longitudinal restraint, but the shear resistance produced by the joints constructed by this structural form basically acts on the vertical direction of the slab seam, and acts parallel to the slab seam. The shear resistance generated in the direction is poor, so the effect is not ideal

Therefore, the joint connection methods of prefabricated floor slabs currently in use are generally not scientific and reasonable, and are not ideal in terms of effect and construction efficiency.

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