By Donald C. Hegebarth
Strain grouting is a necessary building process that's practiced by means of contractors and engineers around the globe. Used because the nineteenth century, grouting reduces the volume of leakage via rock for dam foundations and underground works. It additionally strengthens soils to supply a solid origin to aid the burden of floor constructions, reminiscent of structures, bridges, and garage tanks. moreover, it truly is often used to fix deteriorated concrete and to provide concrete underwater. This guide introduces a variety of kinds of gear hired in strain grouting purposes played in geotechnical works and examines the working rules and upkeep concerns relative to every apparatus style. essentially meant for computing device operators and upkeep mechanics, this guide also will end up important to specification writers, engineers, contractors, paying for managers, and others who've a accountability to specify, gather, function, or retain strain grouting apparatus. themes lined contain mixers, agitators, pumps, supply structures and add-ons, yet no longer digital tracking and different ancillary gear.
checklist of Figures
checklist of Tables
desk of Contents
1. security concerns
2. Cement Grouts
five. energy concepts
6. strength Transmission
7. Grout supply structures
Appendix: Grouting gear providers and brands
in regards to the writer
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Extra info for Grouting Equipment Manual - Selection, Operation, Maintenance, and Repair
2013 by the Society for Mining, Metallurgy, and Exploration. All rights reserved. Pumps 31 Courtesy of ChemGrout. 5 Pneumatically driven double-acting plunger pump Courtesy of ChemGrout. 6 Electrically powered, hydraulically driven double-acting plunger pump When the discharge valve closes, whatever pressure was exerted on the grout circuit by the pump is confined between the pump and the intended target of the material. Should there be some type of blockage preventing the unimpeded flow of grout, such as a sudden closure of the feature being grouted or a hose becoming clogged or kinked, excessive pressure will quickly build in the line.
All rights reserved. 26 Water pressure test: (a) valve open and (b) valve closed a pressure gauge. 26b shows the pressure generated by the pump with the valve closed. A good habit is to perform this procedure at least once a week and record the results. This reveals a lot, not only about the condition of the pump, but it may possibly suggest ways to improve the application. When the water test pressure drops below an acceptable range for the work required, then it is time to change the stator. As previously mentioned, a stator made with 70 durometer nitrile rubber elastomer should produce at least 87 psi per stage, so that should be the initial target value.
16 shows the parts pertinent to a typical grout pump. 17 are applicable to any piston-type grout pump. The troubleshooting guide © 2013 by the Society for Mining, Metallurgy, and Exploration. All rights reserved. 38 Grouting Equipment Manual Courtesy of Häny AG. 1 is a good place to start when something does not look or feel right during operation of the pump, wherein repairs are contemplated. 17 relate mainly to pumps that are driven by compressed air, although piston and plunger pumps are frequently hydraulically driven.