Concrete Elevator Guide Rail with Steel Reinforcement
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Solution Overview
Problem
Conventional steel guide rails for elevators are expensive and difficult to handle, and alternative materials like concrete pose challenges in forming stable and smooth structures for elevator systems.
Innovation Solution
A free-standing guide rail made predominantly of high-performance concrete, with a profile body that can be detachably attached to the elevator shaft walls, featuring a narrow head area and wide foot area for enhanced stability and smooth guide surfaces, and optionally reinforced with fibers and a plug-in connection system for extended length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If steel profiles are used as guide rails, then mechanical strength and load-bearing capacity are improved, but cost and weight increase
Solution Approach 1:
The guide rail uses a composite structure combining concrete (for compressive strength) with steel reinforcement elements including longitudinal reinforcement bars, transverse reinforcement bars, and wire mesh (for tensile strength). This composite material approach achieves the mechanical strength of steel while reducing weight and cost.
2Strength
If steel profiles are used as guide rails, then mechanical strength and load-bearing capacity are improved, but installation difficulty increases
Solution Approach 1:
The guide rail is divided into multiple prefabricated segments or sections that can be manufactured separately and then assembled on-site. Each segment contains the complete reinforcement structure, allowing for easier handling, transportation, and installation while maintaining overall structural integrity through standardized connection details.
3Weight of stationary object
If concrete is used for guide rails, then cost and weight are reduced, but manufacturing precision and surface quality deteriorate
Solution Approach 1:
The concrete guide rail incorporates steel reinforcement elements (longitudinal bars, transverse bars, and wire mesh) at specific locations to enhance local strength and surface stability. The reinforcement is strategically positioned to prevent cracking and maintain surface quality in critical areas while keeping the overall structure lightweight and cost-effective.
4Weight of stationary object
If concrete is used for guide rails, then cost and weight are reduced, but structural stability deteriorates
Solution Approach 1:
The guide rail employs a composite construction with concrete providing mass and compressive strength while embedded steel reinforcement (longitudinal bars, transverse bars, and wire mesh) provides tensile strength and crack resistance. This combination maintains structural stability while reducing overall weight compared to solid steel construction.
Solution Approach 2:
The concrete guide rail incorporates steel reinforcement elements (longitudinal bars, transverse bars, and wire mesh) at specific locations to enhance local strength and surface stability. The reinforcement is strategically positioned to prevent cracking and maintain surface quality in critical areas while keeping the overall structure lightweight and cost-effective.
Data Source
Figure 1~2
Figure 3(a)~3(b)
Figure 3(c)~4(a)
AI summary
The invention relates to a freestanding guide rail (11) for an elevator system or a guide rail assembly composed of multiple such guide rails (11). The guide rail (11) has an elongated profiled element (17) which is to be detchably secured to a wall of an elevator shaft of the elevator system. The profiled element (17) consists largely of concrete, preferably fiber-reinforced high-performance concrete, and can optionally be reinforced with reinforcement elements (19). The guide rails (11) made of concrete can be produced as T-shaped profiled steel sections, which are conventionally used for this purpose, in a substantially less expensive manner and have sufficiently good mechanical properties upon a suitable material selection and machining.