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Prefabricating, splicing and connecting structure for partially unbonded grouting sleeve and construction method

A grouting sleeve and prefabricated assembly technology, applied in the direction of structural elements, building structures, building components, etc., can solve the problems affecting the application of prefabricated assembled bridge piers, low displacement ductility, etc., so as to change dynamic characteristics, ensure ductility, and reduce residuals. deformation effect

Pending Publication Date: 2022-02-01
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing studies have shown that under earthquake action, the bearing capacity of prefabricated bridge piers is similar to that of cast-in-place piers. When the sleeve is set at the bottom of the pier, the deformation is mainly concentrated at the joints, and its displacement ductility is often relatively low, which affects the grouting. Application of sleeve-connected prefabricated piers in areas with high seismic risk

Method used

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  • Prefabricating, splicing and connecting structure for partially unbonded grouting sleeve and construction method
  • Prefabricating, splicing and connecting structure for partially unbonded grouting sleeve and construction method
  • Prefabricating, splicing and connecting structure for partially unbonded grouting sleeve and construction method

Examples

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Effect test

Embodiment 1

[0072] This embodiment provides a prefabricated assembled connection structure of a partially bonded grouting sleeve.

[0073] Such as Figure 1-4 As shown, a prefabricated and assembled connection structure of a part of the unbonded grouting sleeve, including the main reinforcement of the pier 1 and the overhanging steel bar 2 of the cap that need to be anchored and connected, the casing 3 for the unbonded treatment of the overhanging steel bar 2 of the cap, The grouting sleeve 4 pre-embedded at the bottom of the pier 6.

[0074] The bottom of the pier 6 and the top of the cap 7 are provided with a cushion 5, and the order from top to bottom is the pier 6, the cushion 5, and the cap 7;

[0075] Part of the unbonded grouting sleeve prefabricated assembly connection structure is fixed on the pier 6, cushion layer 5 and cap 7;

[0076] The upper part of the grouting sleeve 4 is the main bar section of the grouting sleeve pier, and the lower part is the section of the extended ...

Embodiment 2

[0083] This embodiment provides a construction method for a prefabricated assembled connection structure of a partially bonded grouting sleeve.

[0084] A construction method for a partially bonded grouting sleeve prefabricated assembled connection structure, comprising the following steps:

[0085] (S1) Bind the pier reinforcement cage, connect the main reinforcement 1 of the pier with the grouting sleeve 4, cast the concrete of the pier 6 pier body and reserve 11 tunnels for unbonded prestressed tendons, and maintain for 28 days;

[0086] (S2) Construction of cap 7, in which anti-corrosion grease is applied to the non-bonded section 10 of the steel bar of the protruding steel bar 2 of the cap that is used to connect with the inner grouting sleeve 4 of the bridge pier 6, and the sleeve 3 of the corresponding length is coated on the The upper and lower ends of the casing 3 are water-sealed with flexible sealant, and the casing 3 is fixed by spring clips 8. At the same time, th...

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Abstract

The invention relates to the technical field of bridge engineering, in particular to a partially unbonded grouting sleeve prefabricating, splicing and connecting structure and a construction method. According to the method, a layer of anti-corrosion lubricating grease is smeared on the bearing platform overhanging steel bar with a certain length in the grouting sleeve, the sleeve with the corresponding length sleeves the bearing platform overhanging steel bar, and the two ends of the sleeve are subjected to water sealing treatment through flexible sealant, so that the bearing platform overhanging steel bar in the grouting sleeve forms a steel bar unbonded section with a certain length. The connection stress of the pier and the bearing platform in normal use is guaranteed, and the energy dissipation capacity of the pier can be improved through sliding friction of the bearing platform overhanging steel bar in the grouting sleeve under the action of an earthquake. Meanwhile, the whole system has the advantages of simple structure, convenience in construction, high economical efficiency and the like, and is convenient to popularize and apply.

Description

technical field [0001] The invention relates to the technical field of bridge engineering, in particular to a prefabricated assembled connection structure and a construction method of a partially bonded grouting sleeve. Background technique [0002] With the application of prefabricated assembly technology in the substructure of bridges, the connection structure of pier joints has become a key technical problem in the application of segmental assembly piers in high seismic risk areas. Grouting sleeve connection can be used for the connection between prefabricated assembled bridge piers and caps, bridge piers and cap girders or bridge pier segments. knot to work. It is one of the most widely used prefabricated assembly connection structures, and its performance under earthquake directly affects the seismic performance of the overall pier. Existing studies have shown that under earthquake action, the bearing capacity of prefabricated bridge piers is similar to that of cast-i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04C5/16E01D19/02E01D21/00
CPCE04C5/165E01D19/02E01D21/00
Inventor 张霁颜陈乐纯张鹏辉吴成峻郝晨宇高奇侯力元王志强
Owner TONGJI UNIV
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