To deliver high quality, reliable and innovative products/services to the underground coal industry in a safety-conscious environment.
For long-term roof and rib support, backfilled steel arches are a proven solution. Our proprietary Celufill lightweight concrete backfill enhances the carrying capacity of arches by reducing point loads, increases beam capacity, and lengthens the life of supported entry areas. We supply Celufill at compressive strengths tailored to meet site-specific needs. Celufill can be pumped long distances from remote surface locations to reduce the cost of material transport.
Remotely pumped concrete eliminates costly, time-consuming transport and handling of prepackaged material. We can pump concrete for walkway and conveyor belt transfer point floors up to 5,000 feet from the surface to the installation.
Where remote pump placement is impractical, our on-site underground mixing and pumping system is an economical solution.
To help you confirm barrier distances or pump water into or out of old works, our skilled crews can safely drill in-seam horizontal holes, hundreds of feet in length. We also drill through seals or other concrete barriers to provide safe access points into old works.
Decades of shaft-sinking expertise gained under challenging conditions have made us the experts in shaft damage repair. We control water leaks and replace damaged concrete quickly and reliably.
R. G. Johnson Company, Inc. has expanded its concrete pumping expertise to include the turnkey or technical support installations of our pumpable roof supports. Extensive testing of the grout system and the bag has met the most stringent requirements of high-capacity yielding gate road supports. Installation from remote surface sites or out by underground locations with +10,000 feet of pumping range provide maximum flexibility for gate road and bleeder supports.
When conditions make mechanized techniques impractical, our expert crews use gopher and jackleg drills for safe spot bolting and entry rehabilitation. Our experience installing high strength, post tension cable and rock bolts with novel drilling and grouting techniques provides engineered solutions for support requirements of high walls and challenging roof conditions.
To minimize dust and improve installation quality, R. G. Johnson uses pre-dampening equipment when applying semi-dry-process shotcrete. We can pump material from a remote surface location deep underground. Our highly qualified teams increase the life of mine entries by applying premium materials to mine roofs and ribs. Typical applications include reinforcement of portal bottoms, air-shaft approaches, sumps, overcasts, and conveyor belt transfer points.
In situations that preclude remote pumping, our portable underground pre-dampening and pumping system is an effective solution.
To control weathering or provide support for mine roof and ribs, we apply thin spray-on liner (TSL), a strong, polymer-based compound. This single-component powder is applied at a thickness of 1/16 to 3/8 inch, using specially modified shotcrete application equipment. TSL provides many logistical and performance advantages over other shotcrete and other weathering protection alternatives.
Long before the Federal mandate for ventilation-seal upgrades, we shared your awareness of the critical role seals play in protecting thousands of lives and billions in investments. Whatever your seal specs call for, we perform agency-approved installations with the same close attention to detail that marks every R. G. Johnson Company project.
© Copyright 2011 R. G. Johnson Company, Inc.
