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Self-resetting prefabricated pier structure for single pile foundation and assembly method thereof

A monopile foundation and prefabricated assembly technology, which is applied in the direction of foundation structure engineering, bridges, sheet pile walls, etc., can solve the problems of repairability and long-term use performance, difficulty in on-site construction, lack of structural forms, etc., and achieve reduction The effect of bridge maintenance work, improvement of construction quality, and simple structure

Inactive Publication Date: 2020-06-09
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current self-resetting pier structure is mainly designed for pile group foundations or enlarged foundations, but for single pile foundations that are widely used in bridge construction, there is still a lack of structural forms that meet the requirements of engineering practice
In addition, the structure of the existing self-resetting bridge piers is complicated, and the site construction is difficult, and its repairability and long-term performance still need to be improved

Method used

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  • Self-resetting prefabricated pier structure for single pile foundation and assembly method thereof
  • Self-resetting prefabricated pier structure for single pile foundation and assembly method thereof
  • Self-resetting prefabricated pier structure for single pile foundation and assembly method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Self-resetting prefabricated bridge pier structure for monopile foundation, including bored pile foundation 1, prefabricated pile top platform 2 and prefabricated pier 3 with base 4; as figure 2 As shown, a groove 8 is reserved on the top of the prefabricated pile top platform 2, and a long reserved channel 7 made of steel bellows is provided in the middle. The reserved channel 7 is arranged in a ring, and its position is connected to the top of the pile foundation 1 The longitudinal reinforcement 5 is aligned, and the prefabricated pile top platform 2 is also pre-embedded with threaded anchors 9 for energy-dissipating tendons, and the threaded anchors 9 are arranged in a ring on the outer edge of the pile top platform 2; figure 1 As shown, the pile foundation 1 is located under the prefabricated pile top platform 2, and bears the weight of the prefabricated pile top platform 2 and the static and dynamic load of the bridge. Full contact with the prefabricated pile top ...

Embodiment 2

[0040] An assembly method for a self-resetting prefabricated bridge pier structure for a single pile foundation, comprising the following steps:

[0041] Preparation steps: When prefabricating the pile top platform 2 and the pier base 4, the reserved tunnel 1 7, the energy-dissipating tendon thread anchor 9, and the reserved tunnel 2 10 should be arranged in strict accordance with the design plan, and their positions should be confirmed after review. The pile top platform 2 and the bridge pier base 4 should be prefabricated in a matching way to ensure that their contact surfaces match and that the reserved channel 2 10 is aligned with the threaded anchor 9 of the energy-dissipating tendons. The reserved channel-7 should be made of steel bellows, so as to ensure the effective transmission of internal force. The connecting longitudinal reinforcement 5 on the top of the reinforcement cage of the pile foundation should be positioned using a formwork to ensure that it corresponds t...

Embodiment 3

[0050] A repair method for a self-resetting prefabricated bridge pier structure for a monopile foundation, when the base of the pier undergoes rotational displacement under earthquake action:

[0051] S1, open the protective cover 16, remove the fixed steel plate 15 and the circular insert 14, unscrew the yielded energy-dissipating tendon 11 from the energy-dissipating tendon threaded anchor 9 in the pile top platform;

[0052] S2, screw the new energy-dissipating tendon 11 into the energy-dissipating tendon threaded anchor 9, reinstall the circular insert 14 and the fixed steel plate 15, and then install the protective cover 16 to complete the repair work, and the bridge immediately restores its seismic performance.

[0053] The invention has no damage to other parts except the yielding of the energy-dissipating tendons under the action of the earthquake, thereby ensuring the use function of the bridge after the earthquake. The yielded energy-dissipating tendons can be quickl...

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Abstract

The invention discloses a self-resetting prefabricated pier structure for a single pile foundation and an assembly method thereof. The self-resetting prefabricated pier structure comprises a pile foundation, a prefabricated pile top platform, a prefabricated pier with a base and energy dissipation ribs. The pile foundation and the prefabricated pile top platform are assembled through connecting longitudinal bars; the prefabricated pier is arranged in a groove at the top of the pile top platform; the energy dissipation ribs are connected to the prefabricated pile top platform and a pier base. Aprefabrication technology is used for construction, the construction period is short, and environmental pollution is small. In addition, self-resetting is realized by utilizing the swinging of the pier on the pile top platform; earthquake energy of an input structure is dissipated through yield of the energy dissipation ribs, residual deformation of the bridge after an earthquake can be remarkably reduced or eliminated, normal use of the bridge after the earthquake is guaranteed, and the earthquake resistance of the bridge can be rapidly recovered by replacing the energy dissipation ribs, therefore the structure has wide applicability and positive social significance and scientific significance.

Description

technical field [0001] The invention belongs to the technical field of prefabricated assembled bridge structures, and in particular relates to a self-resetting prefabricated assembled bridge pier structure used for single pile foundations and an assembly method thereof. Background technique [0002] It is well known that earthquakes pose a serious threat to bridge safety. Traditional bridges usually use the cracking and crushing of concrete in the plastic hinge area at the end of the pier and the yielding of steel bars to dissipate the seismic energy input into the structure, thereby preventing bridge damage and collapse. However, the traditional seismic design method lacks attention to the function of the bridge after the earthquake. The plastic hinge area of ​​the damaged bridge pier during the earthquake may be difficult to repair or take a long time to repair, and the bridge pier may also have a large residual displacement, which will cause the bridge to lose its ability...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01D19/02E02D5/34E02D27/12E02D31/08
CPCE01D19/02E02D5/34E02D27/12E02D31/08
Inventor 程钊王景全李帅
Owner SOUTHEAST UNIV
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