Underpass Deck Construction via High-Performance Concrete
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Solution Overview
Problem
Conventional methods for constructing passages through embankments often require multiple temporary interruptions of traffic, extensive use of auxiliary structures, and significant earthworks, leading to increased costs and time due to the need for preliminary prefabrication and movement of heavy equipment, which is inefficient and costly.
Innovation Solution
The method involves constructing only the deck of the passage during a short traffic interruption, using high-performance or ultra-high performance concrete, and subsequently building the side walls and galleries without the need for temporary structures, allowing for continuous traffic flow and minimizing excavation and backfilling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods are used to construct passages through embankments, then the structure can be built with traditional materials and methods, but multiple temporary interruptions of traffic are required and extensive auxiliary structures must be installed
Solution Approach 1:
The patent applies preliminary action by constructing the deck portion of the passage structure during the brief traffic interruption period, using high-performance concrete that achieves sufficient strength quickly. The side walls are then constructed afterward during normal traffic flow by excavating through the embankment and building within the enclosed space, eliminating the need for multiple traffic interruptions while ensuring structural stability through the sequential construction approach.
2Ease of manufacture
If traditional construction methods are used, then the passage structure can be built, but extensive earthworks and backfilling are required
Solution Approach 1:
The patent segments the passage structure into two distinct parts: the deck portion constructed during traffic interruption period, and the side walls constructed afterward. This segmentation allows the earthworks to be minimized and concentrated in a specific phase, rather than requiring extensive excavation and backfilling throughout the entire construction process. The deck is built on prepared ground, and the side walls are constructed by excavating only the necessary space within the embankment.
3Reliability
If auxiliary structures such as auxiliary decks and temporary stiffeners are used, then the passage can be constructed, but the cost and complexity of the project increase
Solution Approach 1:
The patent extracts and eliminates the need for auxiliary decks and temporary stiffeners from the construction process. By using high-performance concrete for the deck portion that achieves sufficient strength quickly, and by constructing the side walls afterward within the enclosed space created by excavating through the embankment, the method removes the requirement for complex temporary support structures while maintaining construction reliability.
4Ease of manufacture
If preliminary prefabrication and movement of heavy equipment is performed, then the passage structure can be constructed, but the cost and time efficiency decrease
Solution Approach 1:
The patent applies preliminary action in a optimized manner by preparing the ground and constructing only the deck portion during the brief traffic interruption period, rather than performing extensive preliminary prefabrication and equipment movement. The high-performance concrete allows the deck to be constructed quickly on-site, and the side walls are built afterward during normal traffic flow, eliminating the need for costly and time-consuming preliminary prefabrication and heavy equipment movement while maintaining construction quality.
Data Source
AI summary
Method for building structures, particularly passages under operating railways or the like. The invention relates to a method for considerably reducing the occurrence and duration of temporary service interruptions required for building underpasses. After temporarily interrupting service on the tracks (9) and placing said tracks perpendicular to the site in the embankment of the passage that is to be built, the top of the embankment is cleared of soil in order to allow the deck (4) to be built and sealed (7), then the work area is backfilled (8) and the tracks are put back in place in order to allow traffic to resume at the end of the service interruption period. The side walls (10) of the passage are built by digging channels down to the foundation, placing reinforcement and pouring cement therein, then the interior of the passage is graded in preparation for the eventual permanent bottom slab (16).