Stress application device for reconstructing prestress after pile breaking of prestressed concrete pipe pile and construction method of stress application device

Abstract

The invention discloses a stress application device for reconstructing prestress after pile breaking of a prestressed concrete pipe pile, and relates to the field of civil engineering. The stress application device comprises a hole reserving device, a tensioning device and a stabilizing device; the tensioning device is arranged above the stabilizing device; the hole reserving device is arranged below the stabilizing device; the tensioning device comprises a first sleeve and a second sleeve; and the first sleeve is detachably connected with the second sleeve. The invention further relates to ausing construction method of the stress application device for reconstructing the prestress after pile breaking of the prestressed concrete pipe pile. According to the stress application device, the prestress effect of a pile breaking section can be reconstructed after the pile top of the stress concrete pipe pile is broken.

Description

technical field [0001] The invention relates to the field of civil engineering, in particular to a prestressed reinforcing bar reinforcement device after a prestressed concrete pipe pile tops a broken pile and a method for re-establishing the prestressed effect of the broken pile section. Background technique [0002] Prestressed concrete pipe piles can be divided into post-tensioned prestressed pipe piles and pretensioned prestressed pipe piles; pretensioned prestressed pipe piles are hollow cylinders made by pretensioning prestressing technology and centrifugal forming Slender concrete prefabricated components, mainly composed of cylindrical pile body, end plate and steel ferrule. [0003] Prestressed concrete pipe pile is a prefabricated component made of high-strength concrete and high-strength steel bars. It has good crack resistance, high rigidity, high single pile bearing capacity, strong applicability, high degree of industrialization, low cost, and convenient constr...

AI Technical Summary

Problems solved by technology

Not only that, after the pile is broken, the anchorage of the prestressed steel bar can only be achieved through the bond between the concrete and the prestressed steel bar at the pile top section. There is a stress transfer length at the pile top, and the prestress effect is not established sufficiently within the transfer length range.

[0006] Under the action of tension, the crack resistance of the concrete in the unstressed section and the stress transmission length range is insufficient, which is easy to cause cracking and affects the durability of the structure; because the concrete in the unstressed section and the stress transmission length range withdraws from work during the tension process , the tensile stiffness of this section is only provided by the prestressed steel bars, and the area of ​​the prestressed steel bars is small, so the restraint stiffness of the pile body to the superstructure is weak

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