Hydrauliske gripesylindere for TBM-støttesystemer
Engineering the ultimate rock-anchoring stability with 42CrMo thick-walled technology for Main Beam and Shield Tunnel Boring Machines.
The Foundation of Hard Rock Advancement
In the unforgiving environment of deep-rock tunneling, the Main Beam TBM relies on a single critical mechanism to generate forward thrust: the gripper system. Unlike shield machines that push off concrete segments, an Open TBM anchors itself directly into the tunnel walls. The hydraulic gripper cylinders responsible for this task must sustain immense radial loads, often exceeding 400 bar, to prevent the machine from slipping during the cutterhead’s stroke. The structural integrity of these cylinders is non-negotiable. A failure here does not just mean downtime; it means the machine loses its footing, potentially trapping the TBM and stalling infrastructure projects worth billions.
På Even makt, our engineering focus over the last 18 years has been to solve the specific pathology of gripper cylinder failure: barrel fatigue cracking. Standard construction steels often lack the elasticity to handle the repetitive expansion cycles caused by high-pressure hold functions. We utilize 42CrMo høyfast legeringsstål combined with a specialized thick-walled barrel design. This ensures that the hoop stress remains well within the material’s yield limits, even when anchoring into unstable, uneven rock strata. Our double-acting, piston-type welded cylinders provide the rigid backbone required for modern mega-projects.
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Combating Hoop Stress and Barrel Fatigue
The primary enemy of a TBM gripper cylinder is “ballooning”—the elastic deformation of the cylinder barrel under extreme internal pressure. When a TBM anchors, the hydraulic pressure spikes to secure the shoes against the rock. If the cylinder wall is engineered using standard ST52 steel, this repetitive cycle leads to metal fatigue and eventual longitudinal cracking.
Our solution involves a fundamental material shift to **42CrMo (Chromoly Steel)**. This material offers a yield strength approximately 50% higher than standard carbon steels. By combining this high-grade alloy with a significantly increased wall thickness, we dramatically reduce the localized stress concentration. Furthermore, the internal surface is honed to a mirror finish (Ra < 0.4µm) to protect the piston seals during the micro-adjustments that occur as the rock face compresses. This rigorous approach extends the fatigue life of the cylinder by a factor of three compared to conventional designs.
Kjerneteknologiske fordeler
Ekstrem lastekapasitet
Engineered to withstand working pressures exceeding 35MPa and shock loads during rock bursting events. The robust piston design ensures zero drift while anchoring.
42CrMo Alloy Architecture
Utilizing quenched and tempered alloy steel eliminates the risk of barrel propagation cracks, a common failure mode in standard Q345B cylinders under high cycle fatigue.
Vibration-Proof Welding
All structural welds, particularly at the mounting trunnions or clevises, undergo Ultrasonic Testing (UT) and Magnetic Particle Inspection (MPI) to ensure integrity against TBM vibration.
Rock Dust Exclusion
Equipped with heavy-duty metallic scrapers or double-lip PU wipers to shear off concrete dust and silicate debris, protecting the rod plating and main seals.
Global Success: High-Altitude Hydroelectric Tunneling
The Challenge: The Andes Mountains
A multinational consortium constructing a 20km water conveyance tunnel in the Andes faced a critical stoppage. The geology consisted of extremely hard, abrasive granite (250 MPa UCS). The existing gripper cylinders on their Main Beam TBM were suffering from “blooming” (barrel expansion) and seal extrusion due to the immense pressure required to anchor the machine. Cylinder replacements were occurring every 400 meters, causing unacceptable delays.
Ever Power-løsningen
Our engineering team deployed to the site for a structural audit. We designed a retrofit solution using our Ultra-High-Pressure 42CrMo Gripper Cylinders. We increased the wall thickness by 15% and implemented a specialized Parker sealing profile designed for zero-gap extrusion resistance.
Resultatet
The retrofit cylinders successfully completed the remaining 14km of the drive without a single structural failure. The TBM advance rate improved by 18% due to the elimination of hydraulic downtime and the increased confidence of the operators to apply full thrust.
“The rigidity of these cylinders changed the way our machine handled. We could feel the difference in stability when the grippers locked in.”
— Carlos M., TBM Superintendent
“We hesitated to switch from the OEM supplier, but Ever Power’s metallurgical report convinced us. The performance in the granite proved they were right.”
— Hans G., Project Director
“Zero leaks in 5km of tunneling. For a gripper cylinder, that is the gold standard. We are retrofitting our second machine now.”
— Liu Wei, Mechanical Lead
Tekniske spesifikasjoner og parametere
| Parameter | Standardspesifikasjon | Ytelsesfordel |
|---|---|---|
| Sylindertype | Dobbeltvirkende, kraftig stempel | Controlled extension and powerful retraction |
| Tønnemateriale | 42CrMo (herdet og herdet) | Resists barrel expansion and fatigue cracking |
| Arbeidstrykk | 350 Bar (Rated) / 450 Bar (Peak) | Secure anchoring in hardest rock strata |
| Boringsdiameter | 200 mm – 500 mm | Customizable for TBM diameter requirements |
| Monteringsstil | Sfærisk lager / Trunnion | Accommodates TBM steering articulation |
| Stangbelegg | Multi-layer Hard Chrome / Ni-Cr | Protects against scoring from rock dust |
Allsidige applikasjonsmiljøer
While specifically engineered for Main Beam TBMs, our high-load cylinder technology is adaptable for various underground anchoring and stabilization needs.
- ▸
Main Beam TBMs: Primary anchoring for forward thrust. - ▸
Shield TBMs: Auxiliary gripper systems for steering correction. - ▸
Raise Boring Machines: Stabilization cylinders for vertical drilling. - ▸
Mobile Mining Equipment: Roof bolter stabilization jacks.
China’s Engineering Hub for Heavy Hydraulics
Located in the manufacturing heartland of China, Even makt leverages the world’s most robust supply chain for heavy forging and alloy steel processing. We understand that TBMs are bespoke machines; a “catalog” cylinder will not suffice for unique geological conditions.
Our competitive advantage lies in our ability to source premium 42CrMo materials and process them with precision heat treatment (quenching and tempering) at a scale and cost that is difficult to match globally. Whether you are running a Robbins, Herrenknecht, or Komatsu TBM, our engineering team can reverse-engineer your existing grippers and provide a “Severe Duty” upgrade that fits your existing mounting points perfectly.
Ofte stilte spørsmål
Why do you use 42CrMo steel instead of Q345B for gripper cylinders?
What is the cost advantage of buying TBM cylinders from China?
Can you manufacture replacements for Robbins or Herrenknecht TBM grippers?
How long does it take to manufacture a set of large gripper cylinders?
How do you ship these heavy cylinders internationally?
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