Variable Position Platform for Bridge Erection Launching Carrier
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Solution Overview
Problem
Existing special launching carriers face difficulties in erecting the first or last span of a bridge at tunnel entrances or exits, and short bridges with less than three spans, due to size mismatches and instability issues.
Innovation Solution
A special launching carrier with a variable position platform, featuring a rotatable rear leg, height-regulating rollers, and foldable elevatable platforms, allows for adjustable under-bridge height and smooth movement of the erecting beam, enabling precise alignment and stable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed-size under-bridge is used, then the structure is simple, but it cannot adapt to different bridge span requirements especially at tunnel entrances and exits
Solution Approach 1:
The under-bridge is designed with movable components including a rotatable rear leg that can change orientation from perpendicular to parallel with the under-bridge, and foldable variable position platforms that can adjust their position and height. These dynamic elements enable the same structure to adapt to different bridge configurations at tunnel entrances and exits without requiring multiple fixed designs.
Solution Approach 2:
The under-bridge is divided into modular segments including the main under-bridge body, separable roller support groups (front, middle, rear), and independent variable position platforms. This segmentation allows each component to be independently adjusted and positioned to match specific bridge span requirements while maintaining overall structural integrity.
2Adaptability or versatility
If the under-bridge height is fixed, then the structure is simple, but it cannot ensure appropriate horizontal height for different bridge abutments and piers
Solution Approach 1:
The under-bridge incorporates a height regulating mechanism with movable rollers (front, middle, rear) that can be positioned at different heights along the under-bridge length. The rotatable rear leg can be rotated to adjust the vertical position of the under-bridge relative to the bridge abutment or pier, enabling precise height control for various bridge configurations.
Solution Approach 2:
The system changes the vertical position parameter of the under-bridge by adjusting the height of individual roller supports and rotating the rear leg. This allows the horizontal height of the under-bridge to be dynamically modified to match different bridge abutment and pier elevations without redesigning the entire structure.
3Ease of operation
If the front wheel group is directly positioned on the under-bridge, then the structure is simple, but it cannot ensure smooth movement between abutment/bridge and under-bridge
Solution Approach 1:
The transition platform is segmented into multiple levels: the under-bridge surface, the foldable variable position platforms, and the front wheel group. This segmentation allows for gradual height transition and smooth movement, with each platform level serving as an intermediate step for the wheels to move from the abutment or bridge deck onto the under-bridge.
Solution Approach 2:
The variable position platforms are designed to be foldable and elevatable, allowing them to dynamically adjust their position and height. This enables the platforms to accommodate the front wheel group during movement, providing a smooth transition path from the abutment or bridge deck onto the under-bridge surface.
4Ease of operation
If the erecting trolley connection height is fixed, then the structure is simple, but it cannot ensure smooth movement when under-bridge position on height is changed
Solution Approach 1:
The erecting trolley is equipped with a height-regulatable connection part that can adjust its vertical position to match the current height of the under-bridge. This dynamic adjustment ensures that the connection between the erecting trolley and the special carrier for erecting beam remains smooth and uninterrupted, even when the under-bridge position on height is changed during bridge erection.
Data Source
AI summary
The invention provides a special launching carrier with variable position platform and a method for bridge erection using the same. The special launching carrier with variable position platform comprises a special carrier for erection bridge beam and an under-bridge machine with platform. The special carrier for erecting beam comprises a main beam, a front wheel group, a rear wheel group and a lifting device; the under-bridge machine with platform comprises a under-bridge, a rotatable rear leg, a front roller, a middle roller, a rear roller and an erecting trolley arranged on the under-bridge, and the variable position platforms are installed on both sides of tail portion of the under-bridge. When erecting bridge beam, the front wheel group moves onto the variable position platforms, which may be elevated and folded in terms of conditions of the first and last spans of different bridges, so that the bridge erection is achieved.