211.3.02 Equipment A.Cofferdams and Sheeting Use necessary protection such as cofferdams and sheeting when working in or near excavations where the s urrounding earth could fail and endanger personnel or damage the work. Use cofferdams or sheeting to prevent undesirable changes in channels and slopes. C onstruct, remove, and dispose of cofferdams according to Section 525, regardless of whether they ar e meas ured separately for payment. 211.3.03 Preparation A.Preparation of Foundations Prepare and maintain foundations as follows: 1.Do not subject concrete to the action of water before final setting, except as provided for seal concrete i n S ubsection 500.3.05.V. 2.Where footings are placed on a slightly sloped foundation of rock or hardpan, key the center of the foundatio n ap proximately 1 ft. (300 mm) deep throughout an area approximately equal to the dimensions of the column to be placed (unless the Plans require entire footing to be keyed). 3.When the Engineer requires, step the foundation and remove all loose fragments and clean and fill seams as directed. 4.Do not disturb the top of the foundation to ensure that footings are placed on undisturbed material when theyare not resting on rock or hardpan foundations. 211.3.04 Fabrication General Provisions 101 through 150. 211.3.05 Construction A.Foundati ons and Footings The sizes and elevations shown on the Plans are approximate, and are subject to change when directed. B.Inspection Provide the Engineer ample opportunity and safe conditions (as determined by the Engineer) to insp ect fo undations and measure removed materials. Do not place concrete or close foundation areas from view until the ar ea has been inspected and approved. C.Boring of Foundations and Seals Bore foundations as requested and in an approved manner so that the foundation’s adequacy can be determined by the Engineer. Borings are usually required only for foundations and seals with no piles. All borings shall b e mad e in the Engineer’s presence. Bore to at least 6 ft. (1.8 m) deep in rock and 10 ft. (3 m) deep in other material, excluding seals. The entire dep th o f the seal will usually be bored in only one location. 228 228 228 228 228 228 228 228 228 228
D.Backfill Construction Follow these requirements when backfilling: 1.General Backfilling is a part of the work of excavation, except as noted. a.Place the backfill in layers not exceeding 1 ft. (300 mm) of loose material. Compact the layer befor e p lacing the next layer. Backfill around all substructures except those located within the banks of a stream at normal water level. b.Do not jet back fills. c.Place backfill material to apply only balanced horizontal loads to a newly placed structure or portio n o f structure. Do not backfill portions of structures that do not have backfill on al l sides until the concrete has reached the required strength (as determined by the Engineer) to withstand the earth pressures. 2.Intermediate Bents and Piers Compact backfill for intermediate bents and piers to the approximate density of the surrounding soi l. a .Begin and complete backfilling around substructures not supported by piling the next workday after placing the lift, if possible. Backfill at least within three calendar days after placement. b.Backfill footings before beginning form work on the columns . c .Begin backfilling around pile- supported footings and columns after removing forms. Complete as soon as possible but within five calendar days after placing concrete. 3.End Bents and Abutments Compact backfill for end bents and abutments (including their wingwalls) to the density shown on the S tandard Plans or Special Plans. a.Begin and complete the work no later than five calendar days after placing concrete, unless other ti me l imits are indicated on the Plans. If other time limits are indicated, this work may be second stage construction, or second stag e b ackfill construction. b.Steep slopes behind abutments, unless otherwise shown, and take precautions to prevent the backfill from wedging against the abutment. c.Provide drainage behind abutments and their wingwalls as shown on the plans. d .Place backfill for abutment footings and portions of walls having fill on both sides of the wall according t o S ubsection 211.3.05.D.4. 4.Backfill MaterialBackfill around intermediate bents and piers with material removed from the excavation, unless the material is unsatisfactory to the Engineer. a.Ensure that material for end bents and abutments meets the requirements shown on the Standard Plans or Special P lans. W hen suitable material is not available within the immediate vicinity of the bridge within the right- of-way, locate a source acceptable to the Engineer and haul the material to the site. b.Obtain and place backfill material necessary for end bent and abutment construction, including special backfill material used in constructing mechanically stabilized earth wall abutments. c.Ensure that material located and hauled to the bridge site meets the requirements of Class I, Class II, or as shown in Subsection 810.2.01.A.1, unless otherwise noted. Class IIIC1 material may be used in Districts 6 and 7 . d.Ensure that porous backfill (when specified) consists of coarse aggregate size No. 57 as specified i n S ubsection 800.2.01, or crushed stone drainage material as specified in Subsection 806.2.02.A . 229 229 229 229 229 229 229 229 229 229
211.3.06 Quality Acceptance General Provisions 101 through 150. 211.3.07 Contractor Warranty and Maintenance General Provisions 101 through 150.
211.4Measurement
A.Bridge Excavation Bridge excavation is measured for payment as follows: •Bridge excavation is measured in cubic yards (meters) of bridge excavation acceptably removed. •No payment is made for materials removed outside the area bounded by vertical planes a maximum o f in. (450 mm) outside of and parallel to the neat lines of the footings, unless otherwise shown o n the plans. •N o separate measurement is made under the Item of bridge excavation for excavation necessary for end bent construction unless otherwise shown on the plans. •P ortions of structures removed under Section 540 that fall within the excavation limits are not included i n the measurements for bridge excavation. •The vertical pay dimension is measured from the original ground line. However, for grade separatio n s tructures, the vertical pay dimension is measured from the subgrade template of the roadway passing underneath, unless otherwise shown on the plans. •T he vertical pay dimension for excavation at an intermediate bent (constructed within the limits of a p reviously placed end roll) includes the portion of the end roll that falls within the excavation limits. •Each portion of a stepped footing is considered a separate footing (for measurement purposes). •The bottom of each footing or step will be cross -sectioned by the Engineer (to obtain the elevation of the co mpleted excavation). B.Bridge Backfill Bridge backfill is measured for payment as follows: •No separate measurement is made for bridge backfill. •Backfill material hauled to intermediate substructure locations according to Subsection 211.3.05.D.4. is no t meas ured as bridge backfill but is considered a Specification Allowance as set forth in Subsection 211.5.B. •No allo wance is made for material hauled in for use at bridge ends. 211.4.01 Limits General Provisions 101 through 150. 230 230 230 230 230 230 230 230 230 230
211.5Payment
A.Bridge Excavation This work will be paid for at the Contract Price per cubic yard (meter) complete, or at the Contract Price modified as specified below: 1.The Department will pay for all eligible excavation down to 2 ft. (600 mm) below the p lan foundation elevatio n at the Contract Price for bridge excavation. 2.The amount of payment for excavating lower than 2 ft. (600 mm) below the plan elevation is determined by increasing the Contract Price for bridge excavation as follows: a.If excavations extend 6 ft. (1.8 m) or less below the plan foundation elevation, payment for excavating the mater ial from 2 ft. (600 mm) below the plan foundation elevation is at the Contract Price plus 50 percent. b.If excavations extend more than 6 ft. (1.8 m) but not more than 10 ft. (3 m), payment for excavating the mater ial from 2 ft. (600 mm) below the plan Foundation elevation is at the Contract Price plus 75 percent. c.If excavations extend more than 10 ft. (3 m) below the plan foundation elevation, payment for excavating the material from 2 ft. (600 mm) below the Plan foundation is at the Contract Price plus 100 percent. B.Bridge Backfill The Department will not pay for this work separately. Include the cost in other pay items included in the B ridge Contract. The Department will pay 125 percent of the Contract Price for bridge excavation when the Contractor furnishes, and hauls material used as replacement for unsuitable material excavated at intermediate substructure locations. Maximum dimensions and deductions are specified in Subsection 211.4.B . Payment will be made under: Item No. 211 Bridge excavation Per cubic yard (meter) Item No. 211 Bridge excavation grade separation Per cubic yard (meter) Item No. 211 Bridge excavation, stream crossing — no.___ Per cubic yard (meter) Item No. 211 Porous backfill Per cubic yard (meter) 211.5.01 Adjustments General Provisions 101 through 150. 231 231 231 231 231 231 231 231 231 231