Protruding reset lock bolt

Solving challenges in the construction of lining concrete caused by protrusions! Introducing lock bolts with special head fixing materials.

The "Protrusion-less Lock Bolt" is a product that has reduced the protruding part, which was approximately 3 cm from the sprayed concrete surface in conventional lock bolts, to nearly zero. By using this product, it is possible to prevent issues related to the protruding part in the construction of the lining concrete, such as restraint (cracking of the lining concrete) suppression and damage to waterproof sheets during pouring, as well as the occurrence of voids, leading to improved concrete quality. Additionally, for the tightening and removal of the nut, four tightening holes are provided, allowing for easy implementation with a dedicated ratchet wrench. 【Features】 ■ The washer is circular and has beveled edges, preventing damage to the waterproof sheet from corners. ■ Installation of the lock bolt cover, which was previously necessary, is no longer required. ■ For the tightening and removal of the nut, four tightening holes are provided, allowing for easy implementation with a dedicated ratchet wrench. ■ In the smooth-back type tunnel lining method, the fluidity and fillability of the filling mortar are improved. *For more details, please refer to the PDF document or feel free to contact us.

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