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Assembling one arch frame took six workers four hours—and they nearly got hit by it.
Release time:
2026-07-05
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Summary:
Inside the tunnel, as the arch support was hoisted into place, it wouldn’t align with the bolt holes. A worker jabbed it with a crowbar, and the steel frame swayed; everyone jumped back.
Did your heart turn cold at that moment?
Anyone who’s worked in tunneling knows: installing the arch supports is the most grueling and dangerous part of the job. Workers carry them by hand, excavators lift them, and ropes are used to pull them into place—any misalignment means endless adjustments, each one leaving you drenched in sweat. By the end of a shift, six workers are completely exhausted, and they’ve barely managed to install two support frames.
It’s not that the guys aren’t putting in the effort—it’s just that the tools are too primitive.
Later, the safety director of a project team told me, “We’ve replaced our equipment with an arch‑support installation vehicle, specifically designed for erecting arch supports. It has three arms—like it’s got three extra hands. Workers no longer have to stand beneath the steel framework.”
He was referring to the three-arm arch support installation carriage manufactured by Zhengxun Heavy Industry.
When that device was first inserted into the tunnel, the operator sat in the cab and remotely controlled all three arms to move in unison. The left and right arms supported both ends of the arch frame, while the middle arm aligned it and pushed the bolts into place. From the moment it was lifted off the ground until it was properly aligned and locked, no manual support was required throughout the entire process.
What I remember most are two scenes:
First—zero‑point adjustment of the arch frame. In the past, when excavators lifted the arch structure, a discrepancy of two or three centimeters was commonplace, and workers had to resort to heavy hammers to force it into place. This machine’s three booms are independently fine‑tuned: the left and right arms can extend, retract, and rotate on their own. The operator watches the screen and gently pushes the joystick; with a crisp “click,” the end of the arch frame snaps precisely into the connecting plate of the preceding segment. An elderly worker standing nearby stared in astonishment: “It’s just like putting together building blocks.”
Secondly, no one touches the steel frame. During installation, all operations are performed by robotic arms. Workers simply need to don harnesses and tighten nuts from a safe zone. That unsettling feeling of the steel frame swaying at the slightest touch is gone.
To put it plainly, the Sanbi arch‑support installation carriage developed by Zhengxun Heavy Industry doesn’t address the issue of speed; it’s about dignity—those who work in tunneling shouldn’t have to risk their lives every single day.
Moreover, this three‑arm arch‑support installation carriage saves manpower. What used to require six workers now only needs three: one operator and two assistants. The assistants no longer have to crawl under the steel frame; they can simply stand to the side and use an extension wrench. By the end of a shift, their backs are dry, and their hard hats remain neatly in place.
I’m not going to tell you how long its arm is or how much lifting capacity it has. Just remember two things:
Precision — Three-arm linkage ensures perfect alignment.
Stability — human–machine separation, peace of mind.
If you’re still using an excavator and ropes to install arch supports, I sincerely recommend watching a live demonstration of the Zhengxun three‑arm arch‑support installation carriage. Don’t just take the sales pitch at face value—stand right by the working face and watch two sets of arches being installed. Pay attention to the workers’ expressions when they finish: do they smile as they take off their gloves, or frown and rub their shoulders?
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Changsha Base:Hunan Zenxon Heavy Industry Technology Co., Ltd.
Address: Jinrong Tongxin International Industrial Park, Changsha High-tech Zone
Loudi Base:Hunan Haoda Heavy Industry Technology Co., Ltd.
Address: Loudi Avenue, Loudi High-tech Industrial Development Zone, Lianyuan City, Loudi City, Hunan Province
Telephone:400-186-0868
E-mail:3804246750@qq.com
E-mail:19967177733@163.com
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