Service Pit Rib Plates Reduce Steel and Fill Material
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Solution Overview
Problem
Existing service pits require large amounts of steel and fill material to achieve necessary strength, leading to inefficiencies and potential air trapping issues during filling, which complicates installation and increases costs.
Innovation Solution
The service pit design incorporates rib plates made of metal, extending perpendicular to the side walls, with engagement means for precise attachment, allowing for thinner walls and reduced distance between inner and outer walls, along with a separate fill wall for easier filling and reduced material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thick steel plates and large distance between side walls are used, then the service pit has sufficient strength to resist pressure stresses, but a large amount of steel and fill material must be used
Solution Approach 1:
The service pit structure is segmented by introducing transverse partition walls that divide the hollow space into multiple compartments. This segmentation allows the use of thinner steel plates while maintaining overall structural strength through the distributed support system. The partition walls create a framework that reinforces the structure without requiring excessive material in the main walls.
Solution Approach 2:
Instead of uniformly thick walls throughout, the invention applies local reinforcement through strategically positioned transverse partition walls and support elements. This allows thinner wall sections in areas where full thickness is not needed, optimizing material usage while maintaining strength where pressure stresses are highest.
2Stability of the object's composition
If the outer wall extends all the way down to the foundation, then the structure is complete, but air trapping occurs in the hollow space during filling
Solution Approach 1:
The hollow space is segmented by transverse partition walls into multiple fillable compartments. This segmentation creates pathways for air to escape during the filling process, preventing air trapping while maintaining structural completeness. The partitions act as guides that direct fill material and allow air to vent through designated pathways.
Solution Approach 2:
The transverse partition walls serve as intermediary elements that mediate between the outer wall and the filling process. They provide structural support while creating controlled pathways that prevent air entrapment, acting as intermediaries that resolve the conflict between structural integrity and filling efficiency.
3Object-generated harmful factors
If a longitudinally angled bottom section is provided to minimize air trap risk, then air trapping is reduced, but the structure becomes complex leading to extra cost
Solution Approach 1:
Rather than creating a complex angled bottom section, the invention uses simple transverse partition walls to segment the hollow space. This segmentation approach minimizes air trapping through straightforward vertical divisions rather than complex angular geometries, maintaining structural simplicity while achieving the air venting function.
Solution Approach 2:
The invention extracts the air trapping problem from the bottom section design and addresses it separately through the addition of transverse partition walls. This separates the functions of bottom support and air venting, allowing a simple horizontal bottom while preventing air traps through the partition system.
4Ease of manufacture
If the hollow space is filled in one step via an upper gap, then the filling process is simple, but air becomes trapped especially in the bottom region
Solution Approach 1:
The filling process is segmented into multiple steps corresponding to the transverse partition walls. Fill material is introduced in stages, with each partition wall serving as a marker for completion of that section. This segmented approach maintains relative simplicity while preventing air trapping through controlled incremental filling.
Solution Approach 2:
The transverse partition walls are installed in advance to create the segmented structure before filling begins. This preliminary action establishes the air venting pathways and fill level markers that guide the subsequent filling process, preventing air trapping before it occurs.
Data Source
Figure 1~2
Figure 3~4
Figure 5~7
AI summary
The following invention relates to service pit (1) to be installed on a foundation (40) and comprising a module (3), which consists of steel or the like and have at least two longitudinal side walls (5, 6) and a bottom (7), where at least the side walls (5, 6) exhibiting an inner wall (8) and an outer wall (9) arranged at a distance from each other, said side walls, bottom and foundation bounding a hollow space (10), where service pit (1) comprises a number of rib plates (11) being arranged in the hollow space (10) and securely attached to at least the inner and outer walls (8, 9). Hereby is achieved that at least the inner and outer walls (8, 9) may be made with a smaller thickness, hence reducing the amount of steel used, and that the service pit may be manufactured with less distance between the inner and the outer wall (8, 9), thereby reducing the required amount of fill material to be used.