Bridge Roadway Deck Joint Sealing With Crossbeam Support
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Solution Overview
Problem
Existing methods for constructing bridge deck slabs with prefabricated elements fail to reliably seal longitudinal joints under normal construction inaccuracies, leading to potential concrete leakage and reduced structural integrity.
Innovation Solution
A method involving deck slab elements with crossbeams and sealing components installed above the longitudinal beams, ensuring complete sealing of joints and allowing for structural analysis with enhanced static usability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sealing strips are used to support roadway slab elements on longitudinal beams, then the weight transfer and mounting support function is achieved, but the sealing reliability under construction inaccuracies deteriorates
Solution Approach 1:
The sealing function is segmented into two independent components: sealing strips for weight transfer and mounting support, and sealing components for joint sealing. This segmentation allows each component to be optimized for its specific function, with sealing components specifically designed to accommodate construction inaccuracies while maintaining sealing reliability.
Solution Approach 2:
Sealing components act as intermediary elements positioned between the roadway slab elements and longitudinal beams at the longitudinal joints. These intermediaries specifically address the sealing function while allowing mounting supports to handle weight transfer, creating a buffer that accommodates construction inaccuracies without compromising sealing reliability.
2Strength
If sealing strips are used for mounting support, then weight transfer is achieved, but the static usable height is reduced
Solution Approach 1:
The functional segmentation separates mounting support (sealing strips) from sealing (sealing components), allowing the sealing components to be positioned without being compressed by the full weight of roadway slab elements. This preserves the static usable height while maintaining both support and sealing functions.
Solution Approach 2:
The sealing components are positioned in a different spatial arrangement - at the longitudinal joints rather than directly under the roadway slab elements. This dimensional change allows sealing to occur without the compression that would reduce static usable height, while mounting supports continue to provide weight transfer.
3Reliability
If sealing strips are used to seal longitudinal joints, then joint sealing is attempted, but concrete leakage occurs under construction inaccuracies
Solution Approach 1:
The sealing function is separated from the mounting support function, with sealing components specifically positioned and designed for joint sealing. This dedicated sealing component can accommodate joint misalignment and construction inaccuracies without compromising sealing reliability, preventing concrete leakage.
Solution Approach 2:
The sealing components have different physical parameters compared to sealing strips - specifically designed with dimensions and material properties that allow them to accommodate variations in joint alignment and construction inaccuracies while maintaining effective sealing against concrete leakage.
4Strength
If crossbeams are positioned at 70° to 90° to the longitudinal axis, then structural connectivity is improved, but the sealing access and component installation becomes more difficult
Solution Approach 1:
The sealing function is segmented into separate sealing components that can be independently positioned and installed at the longitudinal joints, regardless of the crossbeam angle. This segmentation allows optimal structural connectivity with crossbeams at 70° to 90° while maintaining ease of operation for sealing component installation through dedicated joint positioning.
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
Ensures reliable sealing of longitudinal joints, increases statically usable height, and reduces cantilevered span, facilitating rapid construction and improved structural integrity.
Implementation Method 1
The sealing component is made of a deformable material with a low modulus of elasticity
Implementation Method 2
The mounting support is compressed by the weight of the roadway slab element
Data Source
Figure 1~2
Figure 3~7
Figure 8~13
AI summary
The method for producing a roadway deck (1) having at least one overhang for a bridge (21) having at least one longitudinal girder (11) made of reinforced concrete, prestressed concrete or structural steel comprises the following steps: a. providing roadway deck elements (2); b. placing at least one roadway deck element (2) on the at least one longitudinal girder (11); c. applying the concrete topping (9) to the roadway deck element (2) for producing a construction portion of the roadway deck (1); d. where appropriate, repeating step c or steps b and c for producing further construction portions; characterized in that e. at least two mounting bearings (8) are arranged on the upper side (15) of the longitudinal girder (11); f. at least one transverse beam (3) is placed on the mounting bearings (8); and g. a longitudinal joint (4) between the longitudinal girder (11) and the roadway deck element (2) is sealed by means of a sealing component (7) which is installed over the upper side (15) of the longitudinal girder (11) and next to a lateral surface (6) of a slab (5) of a roadway deck element (2).