Show I 0 ROAD 0 BUILDING CLEAN MATERIALS FOR ROAD Builder Get Perfect Concrete Aggregates gates gat Along Route of Job by Ingenious Method 1 Elimination of the long h haul ul with the assurance at the same time that sand and gravel used med In n concrete road construction would be thoroughly clean and free from organic Impurities was Q Sieved In an Ingenious and economic l on 01 a section of the Denver- Denver Morrison highway ay Comparatively shallow shallow low deposits of ot both required components components compo compo- of the aggregate to be used In mixing this concrete were discovered in the bed of a small stream which o Pd within a quarter of ot a n mile of ot the Job A LL e contractor determined to utilize this natural deposit rather than Incur the expense and loss of ot time Incident to purchase 0 or preparation of ot the aggregates aggregates aggregates ag ag- ag- ag In town and consequent long long- haul to the mixer As It was necessary to wash and screen his aggregates as aJ aswell aswell well as to tc elevate for tor loading into trucks rucks the contractor decided to attempt attempt attempt at at- tempt these operations all In one move if It possible Accordingly h he obtained a six Inch centrifugal pump and about BOO feet of ot sir inch iron pipe A small sump or pit was as excavated d In the bed of ot the tho stream and the Intake of ot the centrifugal gal pump was laid In his pit The bottom o 0 o this pit was below the I level Yel jf Jt f the ground water in the gravel bar or bed of the creek reek The pump pomp took in water sand and pebbles as large as three Inches In diameter from this sump rump and delivered them through the discharge line which W was approximately approximately feet In length to a 11 flat nt screen iOleen on top of ot the bins The supply of sand and stone in the lump JUmp was continuously renewed by means of horse drawn slip sUp scrapers A A. screen composed of ot flat bars Dars was vas placed across the top of ot the sumo SUU to eliminate Intake of ot oversize stones w which could not be handled by the pump At Ar the end of ot the delivery line the water sand and stone were discharged dis dIs- dis- dis discharged charged upon a fiat flat screen having square three eighths of ot an Inch mesh opening The water and pond on ond got 01 ol olA I. I l' l i 1 I t s i A Novel Method of Washing and Elevating Elevating Ele Ele- Gravel for Road Construe Construe- tJ lion Uon on course fell felt through this screen w while We Wethe the larger pebbles rolled on over it and thence Into Iato a bin for pebbles Below the first screen was alts a sand settling box bot The water and sand fell into this till box and the sand saud being heaviest Immediately settled to the bottom while the water carrying the dirt and silt sUt escaped through a waste waste- way vay in the top of ot the box As the tho sand Band accumulated In the bottom It was discharged through gates at periodIc periodic pe pe- intervals Into the sand compartment compartment compartment compart compart- ment of ot the bins beneath The force of ot the water sand and stone atone passing through the pipe line Une was sufficient to scour ever every particle absolutely free tree from dirt and Impurity of ot every kind The pump was driven by a horsepower 60 traction engine |