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External prestress multipoint anchoring strengthening method of bridge structure

A technology of external prestressing and bridge structure, applied in the direction of bridge reinforcement, bridges, bridge materials, etc., can solve the problems of low effective prestressing of longitudinal bridges and insignificant reinforcement effect, so as to compensate for losses, change the mechanical performance, stress clear effect

Inactive Publication Date: 2015-10-07
CHONGQING JIAOTONG UNIVERSITY
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  • Abstract
  • Description
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Problems solved by technology

[0003] However, in the traditional prestressed system, after the prestressed tension is completed, only the tensioned end is anchored, that is, "two-point anchoring". , the deformation of the prestressed beam will be dispersed to the entire length of the cable, resulting in a lower effective prestress of the longitudinal bridge to other parts, and the reinforcement effect is not obvious

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  • External prestress multipoint anchoring strengthening method of bridge structure
  • External prestress multipoint anchoring strengthening method of bridge structure
  • External prestress multipoint anchoring strengthening method of bridge structure

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Embodiment Construction

[0027] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are only for illustrating the present invention, but not for limiting the protection scope of the present invention.

[0028] Such as Figure 1-6 As shown in the figure: 1 is the tooth block, 2 is the prestressed steel beam I, 3 is the prestressed steel beam II, 4 is the anchor point, 5 is the end anchor device, 6 is the middle straight anchor device, and 7 is the backing plate , 8 is the prestressed steel beam, 9 is the section of the box girder, 10 is the bolt backing plate, 11 is the nut, 12-screw, 13-rubber block, 14-concrete block, 15-anchor clip.

[0029] At present, the main diseases of the continuous rigid frame bridges in service are all related to the excessive loss of prestress, and the main content of this embodiment is described by taking the continuous rigid frame bridge...

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Abstract

The invention discloses an external prestress multipoint anchoring strengthening method of a bridge structure. After prestressed steel completes tensioning, anchoring of ends is performed firstly, and then elastic anchoring of midpoints is performed. Compared with a conventional anchoring method, the method solves defects in a conventional two-point-anchoring that effective prestress is too fast to loss when dynamic load is applied, and the method is an effective active strengthening method. The method is advantaged of realizing to ensure integrated effect after prestress tensioning, compensating loss of internal prestress, improving bearing capacity, closing cracks and controlling expansion of the cracks, properly restoring structural linetype and stopping midspan from downwarping continuously, and obviously changing force bearing performance of a concrete structure.

Description

technical field [0001] The invention belongs to the technical field of building structures and construction, and in particular relates to an external prestressed multi-point anchoring reinforcement method for bridge structures. Background technique [0002] The external prestressing system has extensive development potential. It is a "visible and tangible" prestressing system, which can be easily inspected, adjusted or even replaced during the service period, so as to ensure the reliability of structural prestressing. . The external prestressing reinforcement method has no effect hysteresis defects common in other reinforcement methods, and is an effective active reinforcement method. The prestressed reinforcement method is an active reinforcement method that can eliminate the stress hysteresis of the reinforced material. After the reinforced concrete continuous beam is strengthened by prestress, it produces obvious strengthening effect: the cracks of the original beam are...

Claims

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Application Information

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IPC IPC(8): E01D22/00E01D101/28
Inventor 姚国文邹朋栖廖刚
Owner CHONGQING JIAOTONG UNIVERSITY
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