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Vertical prestressed anchorage system and construction method thereof

A technology of vertical prestressing and prestressing tendons, applied in bridge parts, erecting/assembling bridges, bridges, etc., can solve problems such as rusting or damage of prestressing tendons, long exposure time of prestressing tendons, cumbersome and complicated construction, etc. Achieve the effect of simple construction, avoiding corrosion and damage, and simple construction process

Active Publication Date: 2014-05-07
LIUZHOU OVM MASCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The construction of bridge piers is roughly divided into integral cast-in-place piers and prefabricated piers; the general construction steps of the application of prestress on bridge piers are as follows: A, installation of reinforcement caps, and installation of formwork around reinforced caps; B, prestressed tendons according to the design Length (including working length) blanking and braiding; C, prestressed tendon anchor end extrusion sleeve extrusion; D, prestressed tendon positioning, the fixed end is fixed at the anchor pad, and the other end is pulled by a guide chain to ensure its vertical Straight; E, concrete pouring of cap; F, installation and positioning of prestressed steel beam bellows, and continuous extension of bellows with the increase of concrete surface of pier body; G, positioning of anchor plate and spiral reinforcement at the top of pier body and Installation; H. After the concrete strength of the pier body reaches the design strength, prestress tension is carried out; using this technology for anchoring construction, one end of the prestressed tendon and the anchor at the fixed end must be fixed and buried in the cap, and the other end must be pulled by equipment In order to ensure its verticality, as the height of the pier body is poured, the traction equipment is also moved and raised accordingly. The construction is cumbersome and complicated, and the prestressed tendons are exposed for a long time and cannot be replaced, which will easily lead to rust or damage of the prestressed tendons

Method used

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  • Vertical prestressed anchorage system and construction method thereof
  • Vertical prestressed anchorage system and construction method thereof
  • Vertical prestressed anchorage system and construction method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A vertical prestressed anchor system, including embedded parts I, lower anchor unit II and upper anchor unit III, such as Picture 1-1 , figure 2 As shown, the embedded part I includes an upper anchor pad 8, a pre-embedded pipe 5, a lower anchor pad 3 and a grouting cap 12; 2. After the extruded sleeve 1 is anchored, it is formed as a whole with the anchor plate 2 at the fixed end. The anchor plate 2 at the fixed end is a rectangular parallelepiped anchor plate (see image 3 ); the upper anchor unit III is composed of a tension end anchor plate 9 placed on the upper anchor pad 8 for anchoring the other end of the prestressed tendon 7 and an upper anchor 10, and the tension end anchor plate 9 is also Anchor plate with rectangular parallelepiped shape (see Figure 1);

[0052] The through holes on the upper anchor backing plate 8 and the lower anchor backing plate 3 are rectangular, and its size is based on the lower anchor unit. The end faces of the upper anchor backing...

Embodiment 2

[0058] A construction method of a vertical prestressed anchorage system, the steps comprising:

[0059] A. Installation of embedded parts Ⅰ:

[0060] ① Cooperate and connect the lower anchor plate 3 with the grout cover 12 to form a whole (see Figure 5-1 ), located in the anchorage area at the bottom of the prestressed tendon, and pre-embedded in the cap 4; a grouting port is left under the grouting cover 12 to lead out the grouting pipe so that the grouting is sealed after the tensioning is completed;

[0061] ② Install or make embedded pipeline 5:

[0062] If described pre-buried pipeline 5 is made of pre-buried pipe 51 (referring to Figure 1-2 , figure 2 ), the construction technology of segmental welding and concrete layer pouring is adopted; as the pier body 6 is continuously poured and the height is increased, the pre-embedded pipe 51 will also be increased in length by welding; finally, the anchor pad 8 is pre-buried to complete the pier body pouring;

[0063] ...

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Abstract

The invention discloses a vertical prestressed anchorage system. The vertical prestressed anchorage system comprises an embedded part, a lower end anchoring unit and an upper end anchoring unit, wherein the embedded part comprises an upper anchor backing plate, an embedded pipeline or a reserved forming hole, a lower anchor backing plate and a grouting cap; the lower end anchoring unit is a whole formed by making one end of a prestressed tendon pass through an anchor plate at a fixed end and anchoring the one end of the prestressed tendon by an extruded sleeve and the anchor plate at the fixed end; the anchor plate at the fixed end is a cuboid-shaped anchor plate; the upper end anchoring unit consists of a tension end anchor plate which is placed on the upper anchor backing plate and is used for anchoring the other end of the prestressed tendon and an upper end anchorage device; the tension end anchor plate is a cuboid-shaped anchor plate; the cross section of the embedded pipeline is rectangular; through holes of the upper anchor plate and the lower anchor plate are rectangular; the criterion of the sizes of the through holes is that the lower anchor unit can pass through the through hole; and the end surfaces of the upper anchor backing plate and the lower anchor backing plate are provided with rectangular groove notches vertical to the rectangular through holes. The system is simple in structure, is stressed reasonably, and has simple and convenient construction method (manufacture and installation processes).

Description

technical field [0001] The invention relates to a prestressed anchorage system, in particular to a vertical prestressed anchorage system and a construction method thereof. Background technique [0002] The construction of bridge piers is roughly divided into integral cast-in-place piers and prefabricated piers; the general construction steps of the application of prestress on bridge piers are as follows: A, installation of reinforcement caps, and installation of formwork around reinforced caps; B, prestressed tendons according to the design Length (including working length) blanking and braiding; C, prestressed tendon anchor end extrusion sleeve extrusion; D, prestressed tendon positioning, the fixed end is fixed at the anchor pad, and the other end is pulled by a guide chain to ensure its vertical Straight; E, concrete pouring of cap; F, installation and positioning of prestressed steel beam bellows, and continuous extension of bellows with the increase of concrete surface ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01D21/00E01D19/14E01D19/02
Inventor 谢正元周良陆元春李国平曾诚苏强王强罗春林赵靖钊邓昱
Owner LIUZHOU OVM MASCH CO LTD
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