A semi‑bubble type yielding tube
Min. Order: 10,000 Pieces
- Compatible With:
- Rock bolts / anchor cables
- Material:
- High‑quality steel tube
- Lead Time:
- 5 days
- Supply Ability:
- 10,000 Pieces per Day
- Shipping Port:
- qingdao/Khorgos
Product Features & Applications
A semi‑bubble yield tube is a mechanical constant‑resistance yield device for rock bolts, mounted between the nut and plate. Its double‑stage bulges deform in a controlled manner to provide staged yielding, enabling accurate management of pre‑tension and ground pressure. Ideal for high‑stress and large‑deformation roadways, it safeguards the bolt against overload failure.
Product Advantages
1. Visual Pre‑Tension Control
Flattening of the upper bubble indicates that the 6‑tonne pre‑tension target has been achieved, identifiable by the naked eye, enabling standardized construction.
2. Constant‑Resistance Yielding Protection
Rated yielding capacity of 18 tonnes, automatically releasing ground stress to prevent overload fracture of the rock bolt.
3. Reliable Structure and Strong Adaptability
One‑piece steel construction, easy to install without compromising construction efficiency.
4. Deformation Warning for Surrounding Rock
Deformation of the double bubbles provides intuitive feedback on ground pressure conditions, assisting in risk prediction.
Technical Specifications
- Compatible With
- Rock bolts / anchor cables
- Material
- High‑quality steel tube
Trade Specifications
- Reference Price
- USD $1.00 - $5.00
- Minimum Order Quantity
- 10,000 Pieces
- Lead Time
- 5 days
- Supply Ability
- 10,000 Pieces per Day
- Shipping Port
- qingdao/Khorgos
Shandong Shengyuan Industrial Equipment Co., Ltd.
Shandong Shengyuan Industrial Equipment Co., Ltd. (Shengyuan Industry), a subsidiary of China's Top 500 enterprise Shandong Ronghui Group, was founded in 1997 with a registered capital of 368.43 million RMB. Inheriting the Luoling Spirit, it commits to intelligent upgrading of mining machinery, focusing on the R&D and production of mining support equipment, lithium battery monorail hoists, hydraulic components and industrial fluid control devices, with five affiliated companies. As a national high-tech enterprise, national "Specialized, Refined, Differential and Innovative" Giant and Shandong Gazelle Enterprise, it runs six production bases with nearly 300 employees. Its average annual revenue growth reached 17.87% in recent two years, and the revenue hit 494 million RMB in 2025. Boasting 92 patents and over 100 technological achievements, many of its technologies are at the leading level at home and abroad. The company has invested nearly 25 million RMB in R&D and plans a high-end equipment manufacturing project with a total investment of 2.9 billion RMB.
- Location
- No. 1 Hengfa Road, Beisu Town, Zoucheng City, Jining City, Shandong Province
- Main Products
- New support products, lithium battery monorail cranes, mining support equipment, hydraulic power machinery and components, alloy castings, valves, hydraulic motors
- Employees
- 101-500 People
- Factory Area
- > 50,000 m²
- Annual Revenue
- Above US$50 Million
- Main Markets
- Southeast Asia / Middle East & North Africa