Construction method of prestressed concrete tongue-and-groove seam

Abstract

The invention discloses a construction method of a prestressed concrete tongue-and-groove seam. The construction method comprises the following steps that (1), a friction rib is arranged between the tongue-and-groove seam and a hollow slab; (2), after the hollow slab is installed, an anti-collision belt is manufactured firstly; (3), longitudinal steel bars are arranged at the upper part and the lower part of the tongue-and-groove seam; after the hollow slab is installed, longitudinal steel bars are arranged on the upper portion and the lower portion of the tongue-and-groove seam, and the upper longitudinal steel bars and the lower longitudinal steel bars are at least three II-level steel bars with the diameter of 18 mm or 20 mm; and (4), pre-stress is formed in the tongue-and-groove joint concrete. According to the construction method, the integrity and consistency of the tongue-and-groove joint concrete and the hollow slab concrete can be improved, prestress is also formed in the tongue-and-groove joint concrete, the tongue-and-groove joint concrete and the prestressed concrete hollow slab can deform together without being damaged, and the use quality of a bridge is guaranteed.

Description

technical field [0001] The invention relates to the technical field of highway bridges, in particular to a construction method for prestressed concrete grooved joints. Background technique [0002] With the rapid development of my country's economy, road traffic construction has developed rapidly for decades and will continue to develop at a high speed. Bridges are an important part of roads, and their number is also increasing rapidly. According to incomplete statistics, there are currently various types of There are nearly 900,000 highway bridges, and more than 10,000 bridges are built every year. my country has become the world's "bridge country" and "bridge power". [0003] Assembled pretensioned prestressed concrete hollow slab bridge is a common bridge type with large quantity and wide area among highway bridges. It has the advantages of large spanning ability, simple structure, clear force, low cost, convenient construction, factory production, and high efficiency. T...

AI Technical Summary

Problems solved by technology

[0005] At present, the bonding force between the grooved concrete and the hollow slab is weak, and the upper part of the grooved concrete is not reinforced longitudinally. It is poured under the condition of the prestressed concrete hollow slab with camber to form a non-prestressed grooved concrete with camber. When the bridge is subjected to vehicle loads, the grooved concrete and the prestressed concrete hollow slab will displace downward together, and the camber will decrease, and even negative camber will appear, resulting in severe cracking of the grooved concrete. The concrete at the opening is broken and falls off, and the bonding force with the concrete of the hollow slab is further weakened, gradually losing the function of laterally distributing loads, forming a stress on the single slab, causing potential safety hazards, and accelerating the damage of the bridge slab and bridge deck pavement, generally 3 to 5 years Maintenance is required once a year, and serious cases may even cause safety accidents

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