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Unbonded prestressed tendon controllable segmental anchorage device and its assembly method and application

A kind of prestressed tendon, non-bonding technology, applied in construction, building structure, processing of building materials, etc., can solve the problem of segmentation problem that has not been well solved, and achieve convenient and fast construction, strong adaptability, Maintenance-friendly effect

Inactive Publication Date: 2017-06-16
BEIJING ACAD OF BUILDING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In general, the segmentation problem of unbonded prestressed multi-span continuous beams has not been well solved

Method used

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  • Unbonded prestressed tendon controllable segmental anchorage device and its assembly method and application
  • Unbonded prestressed tendon controllable segmental anchorage device and its assembly method and application
  • Unbonded prestressed tendon controllable segmental anchorage device and its assembly method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] In the two-span continuous prestressed beam, the controllable segmental anchorage is installed in the node core area on the center column (see Figure 4 ), tension the cable so that it is in a non-working state, after passing through the prestressed tendons, pour the beam concrete, tension the prestress at both ends and anchor, release the cable to make the controllable segmental anchors in a working state. Realize the segmentation purpose of its two-span prestressed beam.

Embodiment 2

[0056] In the three-span continuous prestressed beam, one controllable segmental anchor is installed in the node core area on the center column (see Figure 5 ), tension the cable so that it is in a non-working state, after passing through the prestressed tendon, pouring concrete for the beam, 1) after tensioning the prestress at the left end and anchoring, loosen the cable to make the controllable segmental anchor in a working state, Then stretch the prestressed and anchored right end to achieve the purpose of segmenting the three-span prestressed beam. 2) After the left end and right end are prestressed and anchored, the stay cables are released to put the controllable segmental anchorage in working condition, realizing the segmental purpose of the three-span prestressed beam.

Embodiment 3

[0058] In the three-span continuous prestressed beam, two controllable segmental anchors are respectively installed in the node core area on the left and right central columns (see Figure 6 ), tension the cables so that both of them are in a non-working state, after passing through the prestressed tendons and pouring the beam concrete, 1) after tensioning the left end prestress and anchoring, loosen the cables to make the left segmental anchors controllable In the working state, the right end prestress is stretched and anchored, and the cable is released to make the right controllable segmental anchorage in the working state, so as to realize the segmental purpose of the three-span prestressed beam. 2) After the left end and right end are prestressed and anchored, the stay cables are released to keep the two controllable segmental anchors in working condition, realizing the segmental purpose of the three-span prestressed beam.

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Abstract

The invention relates to a controllable segmental anchorage device for unbonded tendons as well as an assembly method and application thereof and belongs to the field of prestressed concrete structure application. The controllable segmental anchorage device comprises a bidirectional anchor cup, left clamping pieces, a spring, an inhaul cable and right clamping pieces, wherein a through hole is reserved in the axis of the long direction of the bidirectional anchor cup, and a vertical hole is formed in the upper part of the bidirectional anchor cup; the left (right) clamping pieces are 2-3 conical clamping pieces, an oblique perforated ear plate is arranged on the tail part of each left (right) clamping piece, and the inclined direction of the oblique perforated ear plates is opposite to the conical direction of a left conical hole; the spring is connected to the oblique perforated ear plates at the tail parts of the left clamping pieces and the right clamping pieces; the inhaul cable penetrates through the spring, and two ends of the inhaul cable penetrate through the vertical hole of the bidirectional anchor cup; through changing the working condition of the controllable segmental anchorage device, the purpose of segmenting multi-span continuous prestressed girders is realized, so that the purposes of reducing the prestress loss and avoiding the influence on the full span and the mutual influence between the spans are achieved.

Description

technical field [0001] The invention relates to a controllable segmental anchorage device for unbonded prestressed tendons and its assembly method and application, belonging to the application field of prestressed concrete structures, and is mainly used in unbonded prestressed beams, such as long-span structures and stadiums, etc. panels and other components. Background technique [0002] In recent years, with the development of construction technology, the prestressed concrete structure has also been developed rapidly, especially the unbonded prestressed concrete structure, which does not need to reserve holes and is suitable for complex and curved reinforcement components; the construction is simple; The advantages of tension and corrosion resistance have been widely used. [0003] In practical engineering applications, there are often multi-span continuous prestressed beams, the length of which is tens of meters or even hundreds of meters. In the case of pulling, it wil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E04G21/12
Inventor 郭二伟徐刚高晋栋苏浩张立森刘占利周黎光王丰
Owner BEIJING ACAD OF BUILDING ENG
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