460 EXPANSION JOINTS IN STRUCTURES
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- Furnish, fabricate, and install preformed joint fillers, preformed elastomeric joint seals, troughs, structural steel, and metal plates to be utilized in providing expansion and contraction capabilities in structures.
Structural Steel 909, A709, Grade 36 Hardware for Drainage Troughs 909.06 Preformed Joint Fillers 911.02 Preformed Polychloroprene Elastomeric Compression Joint Seals 911.04 Lubricant Adhesive 911.04.03 Troughs 911.11
- All structural steel for drainage troughs shall be hot dip galvanized to meet A123 and A153.
- Ensure that troughs meet the thickness requirements for the type of material supplied. Place joints and splices for drainage troughs only where specified.
- 460.02.01 Paint. Refer to Section 435.
- Store expansion joint material delivered to the bridge site under cover on platforms at least 4 in. above all types of surfaces and vegetation. Protect it at all times from damage and when placed ensure that it is free from dirt, oil, grease, or other foreign substances. All welding shall meet AWS D1.1 unless otherwise specified. Receive approval for all material and installation methods prior to installation of any expansion joint material.
- Provide the longest possible lengths of the preformed material with a minimum of joints. Lengths less than 4 ft shall be one piece. Cut material to a clean, true edge. Ensure straight lines at the joint.
- When installing the seal, do not use any type of equipment that will damage the seal. Remove and replace damaged seals.
- Cleaning And Painting. Refer to Section 435.
- Joint Replacement and Modification. Where the Contract Documents specify replacement or modification to existing expansion joints on bridges on which traffic will be maintained, have available a supply of steel plates at least 4 ft x 8 ft and 1 in. thick. Place these plates over the joints if traffic has to be restored before the concrete has cured and at any time the unfinished work will interfere with traffic.
- Where the Contract Documents specify modification to existing expansion joints, remove the concrete as specified in 405.03.
- Where the Contract Documents only specify replacement of existing roadway joint seal, Clean and paint the joint.
- Thoroughly clean existing drainage troughs to remove of all debris. Clean and paint all exposed metal where noted on the Plans or as directed.
- Cut all angles with a saw. Drill all holes and slots. Do not cut with a torch.
- Power tool clean to bare metal and paint any areas where the existing steel coating is damaged due to the installation of new troughs.
- After the joints are complete in place and just prior to placing the compression seal, remove the masking tape and residue, and install the seal. Then apply the finish coat to the exposed portion of the angles above the seal.
- Joint Seals in Bridge Decks. Place transverse compression seals in one piece for the entire length of the roadway joint. Shop and field splices are prohibited. Use the longest compression seal pieces as practicable for longitudinal bridge joints.
- Apply the lubricant adhesive according to the manufacturer’s recommendations. If the seal is stretched in excess of 5 percent, remove and reinstall the seal as directed.
- 460.03.01 In-Place Testing. Subject the completed joint to a water test to detect any leakage. Conduct the test at least five days after completing the joint. Provide all facilities required for the Engineer’s inspections of the underdeck areas. Cover the roadway section of the joint from curb to curb, or parapet to parapet, with at least 1 in. of water. If this is not possible, perform the water test in part section along the joint. When testing subsequent part sections, overlap at least 1 ft of the joint previously tested.
- Maintain the ponding for a period of five hours for the entire roadway or each section of joint being tested. During and at the conclusion of the test, examine the underside of the joint for leakage. The expansion joint seal will be considered watertight if no obvious wetness is visible. If the joint system exhibits evidence of water leakage at any point, locate and repair all leaks.
- When repairs are required, perform a subsequent water test.
- If the joint leaks after the second test, remove, replace, and retest the seal.
460.04 MEASUREMENT AND PAYMENT
- The payment will be full compensation for furnishing, fabricating, and placing structural steel, roadway seals, drainage troughs, catch basins, downspouts, cleaning, painting, and all material, labor, equipment, tools and incidentals necessary to complete the work.
- 460.04.01 Joints in structures will not be measured but the cost will be incidental to the pertinent Superstructure Concrete item.
- 460.04.02 When an item for Modifying Existing Bridge Roadway Joints is included in the Contract Documents, the cost of furnishing, fabricating, and placing new structural steel, new roadway seals, modifying existing joints on bridge roadway including saw cutting and removal of existing concrete, new concrete, steel plates, cutting of existing steel, welding, drainage troughs, catch basins, downspouts, etc., shall also be included in the Contract unit price per linear foot for the item. The measurement will include the horizontal distance from the inside face to inside face of parapets plus the vertical distance of the curb faces and parapets.
- 460.04.03 When an item for Drainage Trough for Bridge is included in the Contract Documents, the furnishing and placing of drainage troughs including catch basins, downspouts, structural steel, and hardware will be measured and paid for at the pertinent Contract unit price per linear foot. This price will include cutting of angles, cleaning, painting, drilling of concrete, expansion bolts, etc. The measurement will be the center line distance from end to end of the installed drainage trough fabric.
- 460.04.04 Cleaning existing drainage troughs and cleaning and painting metal attachments will not be measured but the cost will be incidental to other pertinent items.