Segmented Steel-Concrete Composite Web for Easier Bridge Encasement
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Solution Overview
Problem
The construction of concrete encasement in composite bridges with corrugated steel webs is difficult, especially for bridges with large spans, leading to reduced construction efficiency and compromised concrete pouring quality due to the complexity of formwork erection, reinforcement assembling, and concrete pouring processes.
Innovation Solution
A steel-concrete composite web design comprising prefabricated segments with corrugated steel webs and inner concrete encasements, featuring a pouring space between adjacent segments and joint reinforcing rebars, allowing for cast-in-place wet joints and simplified on-site construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the length of concrete encasement is increased to improve shear stability, then the stability of the corrugated steel web is improved, but the construction difficulty increases significantly
Solution Approach 1:
The concrete encasement is divided into multiple segments corresponding to different web sections. Each segment is constructed separately with formwork and reinforcement, allowing the long encasement to be built in manageable portions rather than as one continuous difficult structure. The segments are then connected to form the complete encasement system.
Solution Approach 2:
The formwork and reinforcement for concrete encasement segments are prepared in advance before concrete pouring. This preliminary preparation allows complex reinforcement arrangements and formwork configurations to be completed off-site or in controlled conditions, reducing the difficulty and time of on-site construction while ensuring proper structural configuration.
2Length of moving object
If the girder depth is increased to accommodate large span bridges, then the span capacity is improved, but the height of web at intermediate support increases leading to longer concrete encasement
Solution Approach 1:
The web structure is divided into multiple segments with different depths corresponding to different span requirements. The intermediate support section with larger height is segmented into multiple concrete encasement sections, each manageable in size. This allows the overall structure to achieve large span capacity while the encasement construction remains practical through segmentation.
Solution Approach 2:
The problem of increased web height is addressed by introducing the dimensional aspect of segmentation along the length of the web. Rather than treating the encasement as a single continuous element, it is divided into discrete segments positioned at different locations, transforming the construction approach from a monolithic difficult task into a series of manageable dimensional units.
3Reliability
If traditional construction methods are used for concrete encasement, then structural integrity is achieved, but construction efficiency is seriously reduced
Solution Approach 1:
The construction process is segmented into distinct phases: formwork installation, reinforcement assembly, concrete pouring, and formwork removal for each encasement segment. This segmentation allows parallel construction of multiple segments, significantly improving overall construction efficiency while maintaining the structural integrity of each segment through standardized construction procedures.
Solution Approach 2:
Formwork and reinforcement are prepared and assembled in advance before concrete pouring. This preliminary action ensures that all structural requirements are met before the concrete is placed, guaranteeing structural integrity. Meanwhile, the advance preparation reduces on-site construction time and improves overall construction efficiency by eliminating last-minute adjustments.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Simplifies the construction process, improves concrete encasement pouring quality, and enhances construction efficiency by avoiding tedious procedures like formwork erection and reinforcement assembling, while ensuring high-quality concrete encasement.
Implementation Method 1
By utilizing the characteristic of low longitudinal rigidity of the corrugated steel web, the constraint between the top and bottom concrete slabs is relieved
Implementation Method 2
the adjacent corrugated steel webs are welded during construction
Data Source
AI summary
Disclosed are a steel-concrete composite web and a construction method thereof, and relate to the field of bridge engineering. The steel-concrete composite web comprises a plurality of prefabricated web segments connected in sequence, wherein each prefabricated web segment comprises a corrugated steel web and a concrete encasement, each concrete encasement is arranged on the inner side of the corresponding corrugated steel web. The right and left edges of adjacent corrugated steel web segments are connected, and a pouring space is formed between adjacent concrete encasements; and each concrete encasement is provided with joint reinforcing rebars used for stretching into the pouring space, first concrete is poured into the pouring space to form a cast-in-place wet joint, and the joint reinforcing rebars are embedded into the cast-in-place wet joint.