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Hollow slab grider bridge longitudinal prestressing reinforcement method

A hollow slab beam and prestressing technology, which is applied in bridge reinforcement, bridge, bridge maintenance, etc., can solve the problems of large anchorage, potential safety hazards, and large local stress, so as to improve the longitudinal bearing capacity, prolong the service life, The effect of saving investment

Active Publication Date: 2014-05-07
THE SECOND ENG CO LTD OF THE CCCC THIRD HIGHWAY ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to install this kind of anchor with high requirements under the bridge, because it needs to meet the needs of tension, and the size of the anchor is large, which affects the view
The anchor is anchored on the bottom of the hollow slab with a small thickness, the local stress is relatively large, and there are safety hazards during construction and operation

Method used

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  • Hollow slab grider bridge longitudinal prestressing reinforcement method
  • Hollow slab grider bridge longitudinal prestressing reinforcement method
  • Hollow slab grider bridge longitudinal prestressing reinforcement method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: The hollow slab girder bridge in this embodiment is made of conventional hollow slabs, and the broken-line prestressed tendon 4 is selected from a single external steel strand, and the gap between the two channel steels 22 is 2 cm, and the cover plate is connected The diameter of the hole opened at the central position corresponding to the channel steel 22 gap on the 21 is 2 centimeters, and the diameter of the hole punched at the position where the broken line prestressed tendon 4 passes through the hollow slab girder bridge 1 is 2 centimeters. The wires can pass through the above-mentioned gaps between the channel steels, the holes in the connecting plates, and the holes punched on the hollow slab girder bridges. Figure 1 to Figure 4 Shown, a kind of longitudinal prestressed reinforcement method of hollow slab girder bridge of the present invention, carries out successively according to the following steps:

[0023] 1) Design the route of the broken-lin...

Embodiment 2

[0029] Embodiment 2: The difference between this embodiment and Embodiment 1 is that: when the broken-line prestressed tendon 4 in the step 5 is installed, the two ends of the broken-line shaped prestressed tendon 4 are respectively separated from the hollow slab beam bridge in the longitudinal direction. The two diverters 3 below 1 are bypassed, and then the two ends of the broken-line prestressed tendons 4 pass through the hole of the hollow slab girder bridge 1 to the small steel beam 2 respectively, and the broken-line shaped prestressed tendons 4 are placed on the small steel beam. The beam 2 passes through the hole connecting the cover plate 21, the gap between the two channel steels 22, and the hole connecting the cover plate 21, and finally passes the end of the broken line prestressed tendon 4 at the small steel beam 2 through the anchor 6 Anchored after tensioning.

Embodiment 3

[0030]Embodiment 3: The difference between this embodiment and Embodiment 1 is that the broken line prestressed tendon 4 is composed of two inclined sections 41 and a horizontal section 42 of prestressed tendons separated from each other, and the step five When the broken line prestressed tendon 4 is installed, the two ends of the horizontal section 42 of the broken line shaped prestressed tendon 4 are connected with the diverter 3, and one end of the inclined section 41 of the broken line shaped prestressed tendon 4 is connected with the diverter 3, and then Pass the other end of the inclined section 41 of the broken-line prestressed tendon 4 from the perforation of the hollow slab girder bridge 1 to the small steel beam 2, and the inclined section 41 of the broken-line shaped prestressed tendon 4 passes through the small steel beam 2 in sequence. Go through the hole connecting the cover plate 21, the gap between the two channel steels 22, and the hole connecting the cover pla...

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Abstract

The invention discloses a hollow slab grider bridge longitudinal prestressing reinforcement method. The hollow slab grider bridge longitudinal prestressing reinforcement is characterized in that a route is so designed that a folded prestressing tendon is in the longitudinal direction on the a hollow slab grider bridge, a small steel grider is made, according to the designed route of the folded prestressing tendon on the hollow slab grider bridge, holes are dilled on the hollow slab grider bridge, the folded prestressing tendon penetrates through the holes of the hollow slab grider bridge, a redirector is arranged on the junction of the horizontal segment and the inclined segment of the folded prestressing tendon, the redirector is arranged on the lower side surface of the hollow slab grider bridge, the installing position of the folded prestressing tendon is cut on the end portion of the hollow slab grider bridge in the transverse direction, the small steel grider is crosswise arranged on the bridge, the folded prestressing tendon penetrates through the small steel grider and the end portion of the folded prestressing tendon is fixed in an anchored mode through the tension of an anchorage. The hollow slab grider bridge longitudinal prestressing reinforcement method has the advantages of being capable of enhancing longitudinally bearing capacity of the hollow slab grider bridge, reducing occupations at elevated heights under the bridge, increasing longitudinal flexural capacity, improving shear capacity of the bridge, and quickly completing most construction on the bridge surface.

Description

technical field [0001] The invention belongs to the technical field of bridge engineering, and in particular relates to a longitudinal prestress reinforcement method of a hollow slab girder bridge. Background technique [0002] With the increase of vehicle load and axle load, people need to reinforce the prefabricated assembled hollow slab girder bridge built in the early stage to improve its load level. The hollow slab girder bridge is generally assembled by conventional hollow slabs or hollow box girders. When only applying transverse prestress reinforcement along the bridge width direction is not enough to achieve the required load level, it is necessary to increase the bearing capacity of the prefabricated hollow slab girder through longitudinal reinforcement. Longitudinal prestressing is a more efficient method than pasting steel plates or carbon fiber strips. Conventional longitudinal reinforcement is to place steel strands or prestressed tendons of other materials un...

Claims

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Application Information

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IPC IPC(8): E01D22/00
Inventor 魏建东徐平
Owner THE SECOND ENG CO LTD OF THE CCCC THIRD HIGHWAY ENG
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