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Field glossary

Terms — J

27 field terms starting with J, 5 with a full reference page. Each links to the Anvilfield guides where the term is used on the job.

J-hook / bridle ring
Non-continuous cable supports; TIA-569 spaces them no more than 1.5 m (5 ft) apartIn: Cabling pathways and firestop
J1772 / J3400
SAE AC charging connector standard; J3400 standardizes the NACS connector for AC and DCIn: EVSE install and commissioning
Jacking force / fpu
The force applied by the jack, commonly near 0.80 of the strand tensile strength, fpuIn: PT slab stressing
Jam ratio
Conduit inside diameter over cable outside diameter for three same-size cables; a band near 2.8 to 3.0 risks jammingIn: Conduit fill, NEC Chapter 9Cable pull planning and tension card
Jet grouting
Using a high-pressure jet to erode and mix soil with grout into columns of soilcreteIn: Ground improvement and grouting
JHA / AHA
Job Hazard Analysis, called Activity Hazard Analysis on most federal and large commercial jobs: the written breakdown of a task into steps, hazards, and controlsIn: Daily huddle field guide
JHA / JSA / AHA
Job hazard analysis, job safety analysis, or activity hazard analysis; the same process of breaking a task into step, hazard, and controlIn: JHA, toolbox talks, pre-task planningConstruction safety program
JMF
Job mix formula, the approved recipe with target gradation, binder content, and volumetrics, plus tolerance bandsIn: Asphalt paving inspectionAsphalt mix design (Superpave)
JMF / job mix formula
The approved production recipe: target gradation, asphalt content, and temperature with tolerancesIn: Asphalt plant production
Jobsite camera system
Cameras plus a software platform that watch a site for security, progress, safety, and the recordIn: Jobsite camera and video monitoring
Jobsite security
The layered set of measures that protect an open construction site and its tools, materials, and equipment from theftIn: Jobsite security and theft prevention
Jockey / pressure-maintenance pump
A small pump that holds system pressure between events so the main fire pump starts only on a real demandIn: Fire pump acceptance test
Jockey pump
A small pressure-maintenance pump that holds system pressure so the fire pump does not start for normal leakageIn: Fire pump and standpipe guide
Joint adhesive
A hot-applied polymer-modified asphalt run on the cold joint face to bond the new lane to the old edgeIn: Longitudinal joint densityAsphalt paving joints and handwork
Joint deflection
The maximum angle a bell-and-spigot joint can take and still seal, set by the manufacturerIn: Thrust restraint field guide
Joint density
The in-place density at the seam, reported as a percent of Gmm, almost always lower than the adjoining matIn: Longitudinal joint density
Joint maker / restrictor
The shoe or device on the screed edge that shapes the wedge or pinches the unconfined edge of the first passIn: Longitudinal joint densityAsphalt paving joints and handwork
Joint profile / tooling
The finished shape of the joint, struck at thumbprint hardness to match the original and shed waterIn: Masonry repointing and restoration
Joint sealant
The elastic material in a joint that keeps water out while letting the joint moveIn: Joint sealant replacement
Joist span / DCA 6
The distance a joist spans between supports, sized from the AWC DCA 6 and IRC R507 tables by size, species, and spacing, not by eyeIn: Deck construction field guide
Joukowsky relationship
Surge pressure equals fluid density times wave speed times velocity change, so surge scales with velocityIn: Water hammer arrestor guide
Journeyman
A tech who has logged the required hours and passed the exam to work independentlyIn: Apprenticeship and training program
JPCP
Jointed plain concrete pavement; no slab steel, crack control by closely spaced jointsIn: Concrete pavement types
JRCP
Jointed reinforced concrete pavement; wider joints with light distributed steel holding mid-panel cracksIn: Concrete pavement types
Jump / climbing form
A wall form locked, poured, and then raised to the next lift; self-climbing versions carry their own hydraulic jacksIn: Formwork types and systems
Just-in-time (JIT)
Delivering material close to when it is installed instead of stockpiling it, used where there is no room to storeIn: Jobsite logistics field guide
Just-in-time delivery
Scheduling high-value material to arrive close to when it is installed, shrinking the window it sits exposed on siteIn: Jobsite security and theft prevention
IK

All glossary terms

On the job

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