Construction method of ordinary steel bar and finished deformed bar mixed reinforcement assembled pier

A technology of finishing threads and ordinary steel bars, applied in the erection/assembly of bridges, bridge parts, bridges, 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. and repairability, reducing bridge displacement and acceleration, and simple and feasible construction methods.

Active Publication Date: 2018-09-21
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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  • Construction method of ordinary steel bar and finished deformed bar mixed reinforcement assembled pier
  • Construction method of ordinary steel bar and finished deformed bar mixed reinforcement assembled pier
  • Construction method of ordinary steel bar and finished deformed bar mixed reinforcement assembled pier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1, the construction method of the assembled pier of the mixed reinforcement of ordinary steel bar and finish-rolled threaded steel bar is as follows Figure 4 Shown: Firstly, the foundation of the pier cap is poured, and corrugated channels are reserved during pouring, so that the through longitudinal reinforcement can be inserted into the foundation for anchoring; then, the pier bottom segment is assembled, and the rest of the segments are assembled in turn, so that the prestressed tendons are inserted from the segmental Pass through the prestressed tendon channel (8); after the assembly is completed, stretch the prestressed tendon; finally, put the through longitudinal reinforcement into the reserved corrugated channel (5), and perform pressure grouting on the channel to ensure that the grouting is full and dense . The through longitudinal reinforcement is constrained by the surrounding grouting material, the metal bellows (9) and the stirrup (12), so it is...

Embodiment 2

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

Embodiment 3

[0034] Example 3, such as Figure 6 As shown, the difference between this embodiment and the foregoing embodiment 1 is that ordinary steel bars and finished rolled threaded steel bars only pass through several sections of the lower part of the assembled pier body 2, and are not arranged along the entire pier body. For cantilever piers, the bending moment at the bottom of the pier is the largest under earthquake action, and the bending moment gradually decreases from the bottom of the pier upwards. During seismic design, according to the distribution of pier bending moment, the longitudinal 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 provisions of the corresponding seismic design codes. When the height of the assembled pier with mixed reinforcement of ordinary steel bars and fine-rolled threaded steel bars is large, the adoption of ...

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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 a prefabricated segmental assembled concrete pier, in particular to a construction method for an assembled pier with mixed reinforcement of ordinary steel bars and fine-rolled threaded steel bars. Background technique [0002] The collapse of bridges caused by natural disasters such as earthquakes and wars also requires rapid bridge construction technology for emergency reconstruction. The prefabricated segmental assembly bridge system has become one of the effective solutions to meet the above needs, and its good application prospects benefit from the following main advantages: (1) Most of the components are industrialized and mechanized, with outstanding construction efficiency; (2) The on-site construction period is short and is less affected by seasons and weather; (3) The component manufacturing and maintenance conditions are good, so the durability is high, and the maintenance cost of the whole l...

Claims

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Application Information

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Patent Type & Authority Applications(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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