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HomeMy WebLinkAbout- NRBlank spaces to be filled in by the State Highway Department SPFCIFICATIONS For Corzslructiort of Brid~'e z,n ~> ~ r~fxa~~~'~--o f_-- CoacntJ, 1'a~~~,~t.ti~lri7~ of Form 19 SPECI~ICATION~ FOR BI~IL~~~S, •ro sE USED IN CONJUNCTION WITH THE ROAD SPECIFICATIONS APPROVED BY THE STATE HIGHWAY DEPARTMENT OF PENNSYLVANIA. L UENERAL. The intenti ~ of these~ecifications is to describe and co~~er the complete construction and erec- t i o n of .... ~ ~-C.,~. .... .... ~ ..~ .. .... ~~~~~.f. ~ .../. ~ .. .. ~ ~~ - l ~.~....~yZ~L:/. ....~.~~.~...._ ..................................................... and all other ~~~orl: incident thereto. The contractor shall furnish all tools, labor and materials necessary to construct all the wori, called for by these specifications and the plans her~.•inafter mentiuned, and extensions or alterations designated in writing by the State Highway Comirrissioner prior to the execution of the contract. 2. llRA~1'INExS. The drawing accompanying these specifications form an essential part thereof. ~. INSPECTION. The worn and material will be subject to inspection of the State IIighway llepartment. The final inspection and approval to be made by the State Highway- Commissioner, before settlement. 4. EXCAVATION. Excavation will include the removal and proper disposal of all classes of material necessary to secure sufficient foundations for the structures in the opinion of the inspector, even though it may be necessary to go deeper than called for ou the plans. l.xcavation beyond the depth called for on the plans will be paid for at a price to be agreed upon by the contractor and the State IIighway Com- missioner, or at the unit price bid. ~. YILINO. Piles, when required, shall be of white oal~ timber, freshly- cut, sound, straight and free from all defects that impair their durability- and strength. '),hey- must be at least 10 inches in diameter at cut-oil and not less than 6 inches at the small end. Piles must be driven vertically, with such rare as not to damage the timber appreciably below the cut-off. Piles will be paid for according to the lineal feet in place below cut-ofl at a price to be mutually agreed upon. 6. IRON. All wrought iron shall consist of the best American double-refined iron, tough, ductile, fibrous and with an ultimate strength of 50,000 pounds per square inclr, with an elastic limit of 20,000 pounds }rer square inch. Cast iron must be hood, tough, pig metal of the best manufacture, well finished, true to dimensions, smooth and sound. Only the bast galvanized iron pipe, well finished, true to dirnension, sruooth and sound, shall be used for the bridge railing. All exposed threads must be covered with white lead upon completion of the brir3gr>. .111 joints must also be leaded. The ands of piers must be covered with a cap or~ fitting. 7. STEEL. 13olled steel shall be made by the open hearth process, of the grade l.nown as medium, accordint to manufacturers' standard specifications, and shall have an ultimate strength of 6,000 to i 0,000 pounds per square inch, an elastic limit of not less than 3,000 pounds per square inch, and an elongation of ?3 per cent. in eitht inches. The finished product shall be true to size and shape., and free from imperfections such as injurious seams, blisters, buckles, cinder spots or imperfect edges. Old material passim this specification and having suf[icient section, or new material which is suffi- cientl}~ straight tb allow perfect embedding in concrete may be used upon written acceptance by the State IIighway Commissioner. 8. l'E3IENT. ~lll cement shall be of a brand which shall be appro~•ed in writing by the State Highway Com- missioner before ordering, and shall, preferably, be delivered on the worl: in barrels. It shall con- sist of the highest trade of Portland cement, equal in quality to _llpha, :Ltlas, Giant, Lehith or Vulcanite brands. The contractor shall furnish ssunples of the cement to the Mate Hithway Com- missioner before any of it is used in the work. 9. WATER. «'ater shall be fresh and clean, free from earth, refuse and injurious mineral matter. 10. BROKEN STONE. Broken stone shall be clean, hard, sound stone broken into sizes ranting from ~ inch to 2 inches in diameter. It must be thoroughly clean of refuse before using. 11. SAND. All sand shall be clean, coarse, sharp and free from loam and yetetable matter. 12. COIiCLETE. Concrete shall consist of materials in the proportions shown on plans mixed with various quan- tities of water to suit the particular work in hand and the weather at the time. Concrete must be nearly dry in wet foundation, sufficiently wet to form a paste in main walls above ground and quite slushy for finishing surfaces. It must be confined in strong and absolutely rigid forms until it~ has set, and has hardened sufficiently to take the loads to be taken by the work. Finished surfaces must be kept wet for two days after the removal of the forms. 13. MIZINU. The follo«-int is recommended: Spread about one-half of the scud to be used in a batch evenly o~-rr a platform of youth boards prepared for the purpose, then spread the cement e~-enly over the top of the sand, then spread the remainder of the sand ou top, and finally spread over it the required amount of broken stone, whz'cIe aleald b• tlaorou~hly wet '1'he~n mix the «•hole mass thoroughly by turnint and re-turning it with shovels abort four 'times, beint careful to preserve the same thickness of mass, at the same time adding water until the scud and cement have formed a pasty mortar coycrint all stones. If gravel be used instead of sand and broken stone, the travel must first be scrc~c~ned, the stone portion and the sand portion mired in proper proportions, the cement added and the ~yliole mass mixed as above for sand and stone concrete. 1~. LerIN~. Imnudiatel3- after mixing, the concrete shall be laid in layers not exceeding G inches in tliickuess in sections not over 20 feet lone, and shall be thoroughly rammed in place in the unyielding forms provided for the purpose, accordint to the dimensions Balled for on the plans. G-neat care must be used to obtain a monolithic structure from the time of commencement of work to close of work for any one period. _~11 surfaces at the close of worl: must be level, without steps on the face of walls. ~ti'hen the work is resumed, the old surface must be clean and wet, and be washed with neat Portland cement to secure a food bond with the old work. Powlders, when permitted in the work, ma}~ be left projecting above such surface to improve the bond. ~%here smooth surfaces are re- quired in the finished structures, dressed and matched lumber shall be used in the forms, and the concrete must first be thrown against the form, about four inches from the bottom, to cause the stones to bound bacl: into the wall and leave the fine concrete against the form. The interior of the wall must then be filled in, and the whole rammed as directed above. After the removal of the forms, any open or peryions places shall be neatly stopped with pointing mortar, and the whole face kept moistened for several days thereafter. 17. MASONRY. The masonry shall consist of broken range rubble masonry of superior quality laid in cement ntm~tar ~yith horizontal beds, and vertical joints on faces, with no stone less than eitht inches in thiek- ness well bond~•d and le~-eled as well as can be without hammer dressing. 16. HEADERS. At least ono-fourth of the stone in the face must be headers evenly distributed. No "blind headers° ~yill be allowed. 17. ABUTMENTS AND FOUNDATIONS. _lbutments must be built according to dimensions shown on the plans. In case solid footing for the foundations is not obtained at the depth sped fi~•d ou the plan, broken stone shall be used for the necessary filling. IS. BRIUItE SLATS. Bridge-seats shall be made of concrete as shown in plans. 19. WIAI~ WALLS. ~~"ing-walls shall be built at the ends of each abutment at such an angle as may be directed by the State llighway Commissioner. ~0. STF,EL REINFORCIN(x. Steel which is to be embedded in concrete must be cleaned of all scale, rust and oil, and must be protected from the weather until the concrete is placed. Steel shown to bear on masonry must be firmly budded on hood cement mortar or on concrete finished for the purpose. farts of a structure which depend on bolts fur connection with other parts must be fitted with care to obtain the utmost strength and good bearings. Bolts for the purpose must require driving to get diem into place. Abutting ends or bearing. of a ~rtructare must be dressed to afford good contact. Square bars, when specified, shall be twisted one turn in 1'?r inches. Best results can be ob~ tamed by blocking up the steel rods or netting i o be embedded before any concrete is placed, as Rio steel shall be embedded on a surface that has set before the superimposed concrete is placed. .111 re-inforcing must be co~n~lded in sections so that each section shall form a monolith. Con- crete for this purpose may be wet. No cinders shall be used in concrete except for parapet walls and light filling under sidewalla, provided the cinders do not come in contact with any steel. Clean cinders without cement may be used as filling under sidewalla if not placed within two inches of steel surfaces. ~1. C0~(CRETE P®TE)QENTS. Sidewall:s and concrete surfaces on bridge roadways must be completed with a rough finishin<.; coat of the liner portions of the concrete or with ;+. one-inch layer of 1: 3 cement mortar deposited rim,udta,~z~ously with the remainder of the concrete. The surfaces of roadways to be driven upon di- rectly, shall be cut up into herring-bone grooves not over eight inches apart on the square to render them less slippery. Z2. llRAINLUE. '1'hc surfaces in bridge roadways shall have a pitch of one inch in three feet from the center. Ali sidewalks shall have a pitch of one inch toward the roadway, and be approximately on a level with the crown of roadway. ~~'eep holes shall be built where needed to dritin off water that may collect in the rear of abut- ments or on floors which may be affected by frost, even though not specifically called for on the plans. 33, reINT1N0. _111 iron or steel work which will be exposed to the weather in the finished structure must be thoroughly cleaned from all scale and rust, and be given one good coat of red lead and pure raw linseed oil before leaving the shop or stock yard. All surfaces coming in contact, and surfaces n-hich are not accessible after erection shall be painted another coat of red lead and oil before being fastened together. =lfter the erection of the structure, all exposed iron and wood surfaces shall receive two coats of good black bridge paint of approved manufacture. JOSEPH «'. HUNTER, State Highway Commissioner. These Specifications taken as forming part of Contract entered into this ..................._..............................._dav of ....................._...................................., 190 State High scat- Convuissionrr, Contractor.