Bullet Resistant Wall System Using Offset Ballistic Paver Blocks
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Solution Overview
Problem
Existing methods for retrofitting preexisting walls to provide bullet resistance are either expensive, labor-intensive, or ineffective, as traditional concrete filling requires deconstruction and metal shielding, which is costly and heavy, while current building materials like steel stud frames and concrete masonry units fail to stop NATO M80 rounds.
Innovation Solution
The use of ballistic paver blocks made from ballistic concrete, applied in multiple layers with offset seams to create a bullet-resistant wall without metal shielding, using a process that is more cost-effective and structurally lighter than traditional methods, allowing for efficient retrofitting of existing walls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional concrete filling and metal shielding are used to retrofit walls for bullet resistance, then bullet resistance is achieved, but the cost and weight increase significantly
Solution Approach 1:
The patent changes the material parameters by using ultra-high performance concrete (UHPC) with specific compressive strength (≥200 MPa) and tensile strength characteristics, replacing traditional concrete and metal shielding combinations. This material parameter change achieves bullet resistance with reduced weight while maintaining structural integrity against projectile impacts.
Solution Approach 2:
The patent employs composite material systems including UHPC combined with steel reinforcement bars, shear connectors, and adhesive layers. This composite approach creates a synergistic wall system where each material contributes its strengths: UHPC provides compressive strength and bullet resistance, steel provides tensile strength and ductility, achieving protection without excessive weight from solid metal shielding.
2Reliability
If traditional concrete filling and metal shielding are used to retrofit walls for bullet resistance, then bullet resistance is achieved, but the construction cost and labor intensity increase
Solution Approach 1:
The retrofitting process is segmented into distinct construction stages: (1) removing existing weak mortar and preparing the substrate, (2) applying adhesive layer, (3) placing UHPC panels with embedded steel reinforcement, (4) installing shear connectors for structural integration, and (5) grouting joints. This segmentation makes the complex retrofitting process more manageable, systematic, and suitable for standardized construction procedures.
Solution Approach 2:
The UHPC panels are precast with embedded steel reinforcement bars and shear connectors before installation on-site. This preliminary action in the factory setting ensures proper material placement, bonding, and structural integration, reducing on-site construction complexity and labor requirements while maintaining quality control for bullet resistance.
3Ease of manufacture
If conventional building materials like steel stud frames and concrete masonry units are used, then construction is simple, but they fail to stop NATO M80 rounds
Solution Approach 1:
The patent fundamentally changes the material strength parameters by specifying UHPC with compressive strength of ≥200 MPa, which is four times stronger than conventional concrete. This parameter change enables the wall to stop NATO M80 rounds while maintaining a construction process that resembles traditional masonry techniques, balancing simplicity with ballistic protection.
Data Source
AI summary
A bullet resistant wall system including ballistic paver blocks constructed, configured, and arranged to form a wall having at least two adjacent individual layers. The at least two adjacent individual layers include multiple adjacent rows of the ballistic paver blocks. The ballistic paver blocks are formed from wet ballistic concrete prepared without an addition of a preformed foam or wet ballistic concrete prepared without an addition of a stabilizing agent.