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A construction method for assembled piers with mixed reinforcement of ordinary steel bars and precision-rolled threaded steel bars

A technology of fine-rolled threads and ordinary steel bars, applied in the erection/assembly of bridges, buildings, bridge construction, etc., can solve the problem of difficulty in simultaneously reducing the maximum displacement response of piers during earthquakes and residual displacement after earthquakes, and improve the post-earthquake function. performance and repairability, ensure high pier efficiency, and improve the effect of pier stiffness after yielding

Active Publication Date: 2020-06-30
HENGQIN GONGE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention solves the problem that it is difficult to simultaneously reduce the maximum displacement response and post-earthquake residual displacement in the existing assembled pier technology

Method used

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  • A construction method for assembled piers with mixed reinforcement of ordinary steel bars and precision-rolled threaded steel bars
  • A construction method for assembled piers with mixed reinforcement of ordinary steel bars and precision-rolled threaded steel bars
  • A construction method for assembled piers with mixed reinforcement of ordinary steel bars and precision-rolled threaded steel bars

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1, the construction method of the assembled pier with mixed reinforcement of ordinary steel bars and fine-rolled threaded steel bars is as follows: Figure 4 Shown: First, pour the foundation of the pier cap, reserve corrugated channels during pouring, so that the penetrating longitudinal reinforcement can be inserted into the foundation for anchoring; then, assemble the bottom section of the pier, and assemble the remaining sections in turn, so that the prestressed tendons are separated from the The prestressed tendon passes through the tunnel 8; after the assembly is completed, the prestressed tendon is stretched; finally, the penetrating longitudinal tendons are placed in the reserved corrugated tunnel 5, and pressure grouting is performed on the tunnel to ensure that the grouting is full and dense. The penetrating longitudinal reinforcement is constrained by the surrounding grouting material, the metal bellows 9 and the stirrup 12, so it is not prone to compres...

Embodiment 2

[0033] Example 2, such as Figure 5 As shown, the difference between this embodiment and the foregoing embodiment 1 is that the pier body of the assembled pier with mixed reinforcement of ordinary steel bars and fine-rolled threaded steel bars has only one prefabricated section 4. When the pier slenderness ratio is not greater than 6, the entire pier can be prefabricated as a whole section, which can improve the efficiency of pier assembly. Moreover, since the pier slenderness ratio is not greater than 6, the size and weight of the entire section will not be too large and difficult to transport and assemble. When adopting the same or similar design and construction plan as in Example 2, it should be noted that the size and weight of the prefabricated pier section meets the relevant transportation regulations and does not exceed the tonnage limit of the hoisting equipment.

Embodiment 3

[0034] Example 3, such as Image 6 As shown, the difference between this embodiment and the foregoing embodiment 1 is that ordinary steel bars and finished-rolled rebars only penetrate through the lower sections of the assembled pier 2 and are not arranged along the entire pier. For cantilever piers, the bending moment at the bottom of the pier is the largest under the action of an earthquake, and the bending moment gradually decreases from the bottom of the pier upward. According to the pier bending moment distribution during seismic design, the longitudinal steel reinforcement ratio can be gradually reduced and finally cut off at a reasonable height. The determination of the truncation position of the longitudinal reinforcement shall comply with the corresponding seismic design code. When the height of the assembled pier with mixed reinforcement of ordinary steel bars and fine-rolled steel bars is relatively large, this scheme can effectively reduce the amount of steel used ...

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Abstract

The invention discloses a construction method of an ordinary steel bar and finished deformed bar mixed reinforcement segmental assembled pier. The ordinary steel bar and finished deformed bar mixed reinforcement segmental assembled pier comprises a concrete bearing platform, a prefabricated segmental reinforced concrete pier body and two through longitudinal bars and an unbonded prestressed tendon, wherein the two through longitudinal bars and the unbonded prestressed tendon are used for connecting each prefabricated segment. Metal corrugated pipes are placed in the bearing platform and the prefabricated segmental pier body to reserve pore passages; during construction, firstly, each prefabricated segmental pier body is vertically overlapped first, the unbonded prestressed tendon is made to penetrate into the pore passages reserved on the section and is tensioned, each segmental pier body is integrally connected, and mortar does not need to be grouted into the pore passages to seal thepore passages; secondly, ordinary steel bars and finished deformed bars vertically penetrate into the pore passages and pressure grouting is carried out on the pore passages; and thirdly, the mixed reinforcement segmental assembled pier is formed.

Description

Technical field [0001] The invention relates to a construction method for prefabricated segment assembling concrete piers, in particular to a construction method for assembling piers with mixed reinforcement of ordinary steel bars and fine-rolled threaded steel bars. Background technique [0002] The collapse of bridges caused by earthquakes and other natural disasters and wars also requires the use of rapid bridge construction technology for emergency reconstruction. The prefabricated segment-assembled bridge system has become one of the effective solutions to meet the above requirements. Its good application prospects benefit from the following main advantages: (1) Most of the components are industrialized and mechanized, and have outstanding construction efficiency; (2) The on-site construction period is short and is less affected by seasons and weather; (3) The components are manufactured and maintained in good conditions, resulting in high durability, and maintenance costs t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01D21/00E01D19/02
CPCE01D19/02E01D21/00
Inventor 王震宇蔡忠奎
Owner HENGQIN GONGE TECH CO LTD
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