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A Temporary Prestressed Anchor Segmented Prefabricated Cover Beam and Temporary Prestress Applying Method

A segmented prefabricated and prestressed technology, applied in bridges, bridge construction, bridge parts, etc., to save construction time, simplify processes, and reduce labor and financial costs

Active Publication Date: 2021-02-26
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional auxiliary hoisting construction device will eventually need to be dismantled, only for hoisting splicing and temporary anchoring

Method used

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  • A Temporary Prestressed Anchor Segmented Prefabricated Cover Beam and Temporary Prestress Applying Method
  • A Temporary Prestressed Anchor Segmented Prefabricated Cover Beam and Temporary Prestress Applying Method
  • A Temporary Prestressed Anchor Segmented Prefabricated Cover Beam and Temporary Prestress Applying Method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] see Figure 1 to Figure 3 , in one embodiment, a segmented prefabricated cap beam, comprising: a middle section 1, a first cantilever section 2, a second cantilever section 3, a first shear key 7, a second shear key, a first prestressed Rib 4, the second prestressed tendon 5. Wherein, the first end of the first shear key 7 is arranged in the first end of the first cantilever section 2 . The first end of the second shear key is arranged in the first end of the second cantilever section 3 . The first end of the middle section 1 is provided with a first shear slot matching the second end of the first shear key 7, the first end of the first cantilever section 2 is connected with the first end of the middle section 1, and the first The shear key 7 cooperates with the first shear groove. The second end of the middle section 1 is provided with a second shear slot matching the second end of the second shear key, the first end of the second cantilever section 3 is connected t...

Embodiment 2

[0037] see Figure 6 , a temporary prestressing method for temporarily prestressed anchoring segmented prefabricated cover beams, which is used for the segmented prefabricated cover beams in the first embodiment above, and the specific steps are as follows:

[0038] S1: The hoisting middle section 1 is docked with the outer pier 6.

[0039] S2: apply epoxy splicing glue to joints of the first shear bond and the second shear bond;

[0040] S3: hoisting the first cantilever section 2 and the second cantilever section 3 to dock with the middle section 1 respectively.

[0041] S4: Install the first prestressed tendon 4 and the second prestressed tendon 5 in the first pipeline and the second pipeline respectively, adopt single-end tension anchorage, provide 0.3MPa temporary prestress, and perform grouting to seal the prestressed channel.

[0042] A more detailed expression of the construction steps in a specific implementation is as follows:

[0043]Step 1: Prefabricate the firs...

Embodiment 3

[0049] On the basis of Embodiment 1 and Embodiment 2, this embodiment is further explained through practical application examples.

[0050] Taking the cover beam with a total length of 25m as an example, the construction and installation steps are as follows:

[0051] Step 1: The first cantilever section 2, the second cantilever section 3 and the middle section 1 are poured in sections using short lines, the pouring concrete is C50, and the prestressed pipe is embedded at the upper end of the section. The prestressed pipe uses ZSM self-locking pipe. The first PVC pipes are reserved on both sides of the formwork of the cantilever section 2 and the second cantilever section 3, which is convenient for grouting the embedded pipes after tensioning. Pre-reinforcement in the shear channel before precast pouring.

[0052] Step 2: The lifting device first lifts the middle section 1, and paints a layer of epoxy resin on the splicing surface of the bridge pier and the middle section 1 t...

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Abstract

The invention discloses a temporary prestressed anchorage segmental prefabricated cover beam and a temporary prestressed application method. Wherein, the first end of the first shear key is arranged in the first end of the first cantilever section. The first end of the second shear key is arranged in the first end of the second cantilever section. The first end of the first cantilever section is connected to the first end of the middle section. The first end of the second cantilever section is connected to the second end of the intermediate section. The middle section and the first cantilever section are provided with a first pipe with a built-in first prestressed tendon, the first prestressed tendon is arranged in the first pipe, and the first end of the first prestressed tendon is fixed to the first cantilever section The second end of the first prestressed tendon protrudes from the upper surface of the middle section. The middle section and the second cantilever section are provided with a second pipe with a built-in second prestressed tendon, the second prestressed tendon is arranged in the second pipe, and the first end of the second prestressed tendon is fixed to the second cantilever section The second end of the second prestressed tendon protrudes from the upper surface of the middle section.

Description

technical field [0001] The invention belongs to the technical field of building bridges, and in particular relates to a temporary prestressed anchorage segmental prefabricated cap beam and a temporary prestressed application method. Background technique [0002] The cap beam refers to the beam set on the top of the bent pile pier in order to support, distribute and transmit the load of the superstructure, also known as the cap beam. Reinforced concrete or less-reinforced concrete beams are set on piers (platforms) or row piles. The main function is to support the superstructure of the bridge and transfer all loads to the substructure. Some bridge piles are directly connected to the cover beam, and some bridge piles are connected to the column and then connected to the cover beam. [0003] At present, there is no targeted research on the temporary anchorage of the prefabricated construction of the urban overpass cover beam. Generally, steel frames are used for auxiliary con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01D19/00E01D21/00
Inventor 葛继平郁亚宏王志强
Owner SHANGHAI INST OF TECH