Qujiawan Bridge – Prestressed Concrete Bridge in Hubei, China
The Qujawan Bridge (Huankouzikou Bridge)in Honghu City, Hubei Province has a total length of 806 meters. Its main spanadopts a composite structure of “1128 meter through type steel pipe arch bridge + prestressed concrete beams which perfectlyntegrates structural aesthetics with engineering mechanics This projectis undertaken by CCCC Second Highway Consutants CoLtd as the general contractor Our company provides the manufacturing of suspender materials for the entire bridge as wellas theconstruction and installation services.
| Construction Challenge | Description | Prestressed Solution |
|---|---|---|
| Tendon threading difficulty Strand pulling through ducts |
Long, curved ducts cause high friction; strands may kink or fail to pass through. | Use strand pusher/puller with lubricant; pre‑assembly of strand bundles; optimize duct alignment and reduce sharp bends. |
| Asymmetric tensioning Uneven force distribution |
Multi‑strand tendons may experience uneven elongation, leading to unbalanced prestress and structural distortion. | Employ synchronous multi‑jack tensioning system with digital control; monitor each strand’s elongation and adjust oil pressure individually. |
| Grouting voids & corrosion Incomplete duct filling |
Air trapped in ducts or improper grout mix leads to voids, reducing bond and causing strand corrosion. | Use vacuum‑assisted grouting (vacuum pump + high‑quality grout); perform post‑grouting inspection (impact echo or X‑ray). |
| Anchor zone cracking Concrete spalling near anchor head |
High local bursting stress under the anchor plate may cause cracking or even failure. | Install spiral reinforcement or supplementary mesh; increase bearing plate area; apply staged tensioning to reduce peak stress. |
| Jack calibration & safety Inaccurate prestressing force |
Uncalibrated jacks or pressure gauges lead to over‑tensioning or under‑tensioning. | Calibrate jacks and gauges every 200 pulls or monthly; use digital readout with real‑time force/elongation curve; keep calibration certificates. |
| Tendon relaxation loss Long‑term prestress reduction |
Strand relaxation over time reduces effective prestress, affecting serviceability. | Specify low‑relaxation strands (≤2.5% at 1000h); re‑tension if possible; design with appropriate safety margin. |
✅ Solutions based on industry best practices for box girder or continuous rigid‑frame bridges
Qujiawan Bridge – Prestressed construction quality control
Qujiawan Bridge – Prestressed construction quality control
