Bellows Filler Syringe for Air-Free Concrete Crack Injection
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Solution Overview
Problem
Existing methods for injecting fillers into concrete structures often leave air pockets, preventing the filler from reaching internal voids and minute crack portions due to air retention in the syringe or drilled holes, which hampers the effectiveness of the injection process.
Innovation Solution
A syringe design with a bellows-like container body and an extrusion shaft equipped with a coil spring, which ensures the filler is pressed straight into cracks, and a mechanism to remove air from the crack by using a slit in the bellows cap, allowing for deep penetration and minimizing filler loss, while a 'D' shaped pull handle facilitates easy operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional injection methods are used, then the injection process is simple, but air remains in the syringe or drilled hole causing the filler to fail reaching internal voids and minute crack portions
Solution Approach 1:
The patent applies preliminary action by equipping the syringe with a preliminary air removal mechanism (slit in the bellows cap) that actively removes air from the crack before filler injection. This preliminary step ensures the crack is air-free, allowing subsequent filler injection to reach deep internal voids and minute portions effectively.
Solution Approach 2:
The patent uses an intermediary mechanism (the slit structure in the bellows cap) that facilitates air removal during injection. The slit acts as a mediator that allows air to escape while the filler is being injected, solving the air entrapment problem without requiring complete syringe evacuation beforehand.
2Productivity
If air is pressed into the crack during injection, then the injection process continues smoothly, but the filler cannot penetrate to the core of the crack due to air counterforce
Solution Approach 1:
The patent converts the harmful effect of air pressure (which normally blocks filler penetration) into a beneficial air removal mechanism. The slit in the bellows cap is positioned and sized to allow air to be actively expelled during injection, transforming the air counterforce problem into an air removal solution that enables deep filler penetration while maintaining injection continuity.
3Measurement precision
If the syringe is designed to discharge filler straight at the center of the crack, then penetration depth improves, but the device complexity increases
Solution Approach 1:
The patent applies asymmetry in the bellows cap design with an off-center slit positioned at a specific location (e.g., 45 degrees from the vertical centerline). This asymmetric slit configuration, combined with the bellows structure, creates a directional flow pattern that guides the filler jet straight into the crack center while maintaining a relatively simple overall syringe structure.
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
Enables the filler to be injected accurately and deeply into concrete structures, enhancing the stability and strength of the concrete by ensuring the filler reaches the core of the crack without air interference, improving the overall injection process efficiency.
Implementation Method 1
an elastic body (51), such as a coil spring, of the extrusion part (50), and the injection filler (X) is pressed into the crack portion (B) by the elastic force of the elastic body (51)
Data Source
Figure 1A~1C
Figure 2A~2C
Figure 3A~3E
AI summary
A container body including an expansion tube having a bellows-like wall surface is provided to be filled with an injection filler, the container body communicating with a base having an injection port for pressing the injection filler into a crack portion in a wall surface of concrete or the like via a bellows cap communicating with the body, and upon pressing the injection filler into the crack portion by an extrusion part from the injection port of the base, while the container body maintains a state where the injection filler is injected into the crack portion under pressure from an elastic body of the extrusion part, the injection filler remaining in the container body is manually pressed toward the injection port during a period of time when a state where the remaining injection filler is pressed in is maintained, and then the container body is removed from the base and replaced with a new container body to mount the new container body.