Inside single-beam sealed prestressed group-anchor system and construction method thereof

Abstract

The invention discloses an inside single-beam sealed prestressed group-anchor system which comprises a protection cover assembly, working clamping pieces, a sealing anchor plate assembly, anchor bearing plates, a plurality of single-beam sealed prestressed ribs and pre-embedded channels; the sealing anchor plate assembly comprises working anchor plates, rubber cone sleeves, plastic limiting sleeves and a pressing plate; the rubber cone sleeves are of a multiple-piece wedge-shaped rubber ring structure; and the plastic limiting sleeves are arranged to be hollow round shaft sleeves with unequaldiameters and steps. In an installation state, the prestressed ribs correspondingly penetrate through the pressing plate, the plastic limiting sleeves, the rubber cone sleeves located in cone holes IIand cone holes I of the working anchor plates; the working clips clamps the prestressed ribs; the rubber cone sleeves tightly press and cooperate with the working anchor plates cone holes II, and therubber cone sleeves tightly press and cooperate with the prestressed ribs PE protection sleeves. The group-anchor system is mainly used for working conditions with longitudinal replaceable prestressed ribs inside. The sealing anchor plate assembly is used for effectively sealing and connecting with the exposed parts of the prestressed ribs PE protection sleeves, and therefore effectively sealingand anti-corrosion protection are achieved for the prestressed ribs; and construction is simple and practicability is high.

Description

technical field [0001] The invention relates to an internally sealed prestressed group anchor system and a construction method thereof, in particular to an internal single-bundle sealed prestressed group anchor system and a construction method thereof. Background technique [0002] In the post-tensioned prestressed concrete structure, in order to ensure the long-term reliability of the prestressed tendons under high stress state, the prestressed tendons should be effectively anti-corrosion. At present, the monofilament spraying epoxy coating technology is usually used to protect the steel wires. The single bundle of prestressed tendons is protected by wrapping grease and PE sheath, thus playing a triple protection role for the prestressed steel wire. [0003] However, these three layers of protection will be destroyed when the anchor head is clamped. Whether it is an extruded anchor or a clip-type anchor, it will be corroded by the environment due to the damage of the protec...

AI Technical Summary

Problems solved by technology

[0003] However, these three layers of protection will be destroyed when the anchor head is clamped. Whether it is an extruded anchor or a clip-type anchor, it will be corroded by the environment due to the damage of the protective medium. Add a protective cover and a sealing device to provide anti-corrosion protection for the part where the PE sheath is stripped at the clamping point. The sealing device here is usually in the form of a cylinder filled with anti-corrosion medium to provide overall sealing protection for multiple bundles of prestressed tendons, such as the invention patent " A cable anchor using a single seal" (Patent Publication No. CN 106638309 A Figure 10 ), the sealing device of this invention patent is sealed through the joint connection of the sealing cylinder, the positioning plate, the compression ring, and the steel strand casing, and pours a large amount of easy-curable slurry into the sealing cylinder for anticorrosion. Therefore, this The sealing device has the disadvantages that it needs to be prefabricated in advance, takes up a lot of space, fills with a large amount of anti-corrosion materials, and has the disadvantages of high cost

If it is applied to the prestressed structure in the body, it will increase the diameter of the reserved hole of the structure, weaken the structural strength, and is not convenient for installation and construction

Images