Screw jack for tunnel support

Screw jack for tunnel support

screw jack


The screw jack is an essential tool used in tunnel construction projects. It plays a crucial role in providing support and stability during the excavation process. In this article, we will explore the different aspects of screw jacks for tunnel support, including their usage, working principle, and the key differences between screw jacks and hydraulic jacks.

What is a screw jack used for?

screw jack

– Supporting tunnel structures: Screw jacks are primarily used to support tunnel structures, ensuring their stability and preventing collapse during construction.
– Adjusting height and alignment: With their ability to lift heavy loads, screw jacks are utilized to adjust the height and alignment of tunnel segments or other construction elements.
– Providing temporary support: Screw jacks offer temporary support during the installation of tunnel linings, allowing workers to safely complete the process.
– Facilitating maintenance work: They are also instrumental in supporting tunnel maintenance activities, such as the repair or replacement of damaged sections.
– Ensuring worker safety: Screw jacks contribute to the safety of workers by providing stable platforms and structures during tunnel construction, reducing the risk of accidents.

What is the working principle of screw jack?

screw jack

– Mechanical advantage: Screw jacks utilize a mechanical advantage to lift heavy loads by converting rotational motion into linear motion through the use of a screw and a nut.
– Self-locking mechanism: The self-locking feature of screw jacks ensures that the load remains in position without external force, providing additional safety and stability.
– Load distribution: The load is evenly distributed along the length of the screw, minimizing stress concentration and improving the overall load-bearing capacity.
– Precision control: Screw jacks offer precise control over the lifting or lowering process, allowing for accurate positioning and alignment of tunnel components.
– Simple and reliable: With a straightforward design and minimal moving parts, screw jacks are known for their reliability and ease of use in tunnel construction projects.

What is the difference between a screw jack and a hydraulic jack?

While both screw jacks and hydraulic jacks serve the purpose of lifting heavy loads, they differ in their operation and application.

– Power source: Screw jacks are manually operated, requiring physical force to rotate the screw and lift the load. On the other hand, hydraulic jacks utilize pressurized fluid to generate the necessary force for lifting.
– Size and portability: Screw jacks are generally smaller and more portable, making them suitable for applications where space is limited or mobility is required. Hydraulic jacks tend to be larger and may require additional equipment for transportation.
– Load capacity: Hydraulic jacks typically have a higher load capacity compared to screw jacks, making them suitable for heavy-duty lifting operations.
– Speed: Screw jacks generally operate at a slower speed due to manual operation, while hydraulic jacks can lift loads more quickly with the assistance of hydraulic power.
– Precision control: Screw jacks offer finer control and precise positioning, making them suitable for applications that require accurate adjustments and alignment.

How to choose or customize the right screw jack?

screw jack

When selecting or customizing a screw jack for your specific needs, it is crucial to consider the following parameters and practical conditions:

– Load capacity: Determine the maximum load that the screw jack needs to support to ensure it can handle the required weight.
– Travel distance: Evaluate the vertical travel distance to ensure the screw jack can provide sufficient lifting height for your application.
– Operating speed: Consider the required lifting speed and choose a screw jack with an appropriate gear ratio or motor speed to meet your operational needs.
– Environmental conditions: Take into account factors such as temperature, humidity, and potential exposure to corrosive substances to select a screw jack with suitable material and protective coatings.
– Safety features: Prioritize screw jacks that offer built-in safety features such as overload protection, emergency stop mechanisms, and limit switches to ensure the safety of both workers and equipment.

At HZPT, we pride ourselves on being a leading manufacturer of screw jacks in China. Our range of products includes micro gearmotors, brake speed control motors, torque motors, NMRV worm gear motors, and various types of gear reducers. With our commitment to technological innovation and exceptional quality, we have become the preferred choice for automation equipment in industries such as transportation, food processing, medical, printing, textile, packaging, and more.

Here are five key advantages of our screw jacks and company:

1. High load capacity and reliability: Our screw jacks are engineered to handle heavy loads with exceptional precision and reliability, ensuring optimal performance in demanding applications.
2. Customization options: We offer a wide range of customization options to meet specific requirements, including load capacity, travel distance, speed, and safety features.
3. Superior quality materials: Our screw jacks are manufactured using high-quality materials and advanced production techniques, ensuring durability and long service life.
4. Innovative design: Our screw jacks feature innovative designs that maximize efficiency, minimize backlash, and provide smooth and precise operation.
5. Excellent customer support: We are dedicated to providing excellent customer support, offering technical assistance, product selection guidance, and timely after-sales service.

Partner with HZPT for your screw jack needs and experience the reliability and performance that our products and services have to offer.

screw jack


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Ep Screw Jack Co., Ltd.

Mail: [email protected]

As one of leading manufacturers, suppliers and exporters of mechanical products in China, We offer reducers, sprockets, industrial and conveyor chain, belts, pulleys, gears, racks, gearboxes, motors, PTO Shafts, taper lock Bushing, vacuum Pumps, screw air compressors and many other products. Please contact us for details.