Post-tensioning method for prefabricating small box girder and construction method thereof
By using a straight second duct that forms an angle with the web in the post-tensioned precast small box girder, the problems of complex duct positioning and prestress loss in traditional precast small box girders are solved, achieving efficient construction and prestress durability, and reducing project costs.
CN119465752BActive Publication Date: 2026-05-29ROAD & BRIDGE INT CO LTD
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- ROAD & BRIDGE INT CO LTD
- Filing Date
- 2024-12-09
- Publication Date
- 2026-05-29
AI Technical Summary
Technical Problem
In traditional post-tensioned precast small box girders, the positioning of prestressed ducts in curved sections is complex, the construction accuracy requirements are high, the grouting is not dense, and the prestress loss is serious, which affects the structural performance and service life of the beam.
Method used
A straight second duct is set at a certain angle to the web, and the second prestressed tendon passes through the straight duct to reduce friction, simplify positioning, improve grouting quality, and reduce prestress loss.
Benefits of technology
It simplifies pipeline positioning, improves construction accuracy and production efficiency, ensures the durability of prestressing and the safety of beam structure, and saves project costs.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure CN119465752B_ABST
Abstract
The application discloses a post-tensioning method prefabricated small box girder and a construction method thereof. The post-tensioning method prefabricated small box girder comprises a bottom plate, two webs, a first pipe and a second pipe, and first and second prestress bundles. The bottom plate extends along a first direction. The two webs are respectively connected to opposite edges of the bottom plate along the first direction. The first pipe is arranged in the bottom plate along the first direction. The second pipe is arranged in the web along a direction which forms a certain angle with the first direction, and a first end of the second pipe is located at an end of the web along the first direction, and a second end of the second pipe is located at a side of the bottom plate which is away from the web. The first prestress bundle is arranged in the first pipe. The second prestress bundle is arranged in the second pipe. The post-tensioning method prefabricated small box girder is simple in construction positioning, and the pipe grouting quality is easy to guarantee. The production efficiency is improved, the prestress loss is reduced, the effective prestress of the structure is ensured, the structural safety and service life of the girder body are beneficial, and the engineering cost is saved.
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