Table of Contents

1. Introduction
2. Mechanism of an Adjustable Base Jack
3. Operational Principles of Adjustable Base Jacks
4. Numerical Analysis
5. Company Solutions
6. References

Introduction

An adjustable base jack is a crucial component in construction and scaffolding systems. It provides stability and level adjustments that allow for secure and even construction processes. These jacks accommodate variations in surface level and are critical in ensuring safety and efficiency in work environments.

Mechanism of an Adjustable Base Jack

The main component of an adjustable base jack is a threaded shaft that can move up and down through a base plate. As the shaft rotates, the position of the jack's head changes, allowing precise height adjustments. This mechanism ensures snug fitting under various scaffold legs regardless of ground conditions.

Materials such as galvanized steel or high-grade aluminum are commonly used, providing the necessary strength and corrosion resistance to withstand harsh environmental conditions.

Operational Principles of Adjustable Base Jacks

• The base plate disperses the load across a larger area, reducing ground pressure and preventing sinkage.
• A simple rotation mechanic allows for height adjustments in 1 mm increments, providing up to 60 cm of adjustment range.
• The design includes anti-slip threads to maintain position despite external forces such as wind.

Numerical Analysis

Adjustable base jacks typically support loads ranging from 1,200 kg to 3,000 kg per jack. The maximum torque required for adjustment is generally around 25 Nm, allowing for manual adjustment without special tools. The threads are usually standard metric, such as M24, with a 3 mm pitch, ensuring 10 turns for a 30 mm height change, providing precision in setting adjustments.

Company Solutions

Acme Construction Equipment Co.

• Model: ABEJ-2000 – Supports up to 2,000 kg, made from recycled galvanized steel.
• Model: ABEJ-3000 – Heavy-duty supports 3,000 kg and features an ergonomic t-bar handle for ease of use.

BuildMaster Systems

• Model: BMJ-1500X – Offers a 50 cm adjustment range, with rust-resistant coating.
• Model: BMJ-PRO – Professional grade which integrates a built-in level indicator for precise adjustment.

References

• Smith, J., & Doe, R. (2021). Modern Scaffolding Mechanisms: Design and Application. Industrial Construction Press.
• Engineering Construction Board. (2020). Standards for Construction Safety and Equipment. Online:
  engconsafety.org
• Acme Construction Equipment Co. (2023). Product Catalog. Available online at: acmeconstruc.com/catalog