- 648 - SECTION 730 -- STRIP SEALS
730.01 Description
1.The item, "Strip Seals", sha ll consist of furnishing and installing prefabricated steel extrusions supp orting neoprene seal inserts, including integral curb units where specified, at the locations and limits shown in the contract. The seals shall be standard prefabricated products corresponding to the types and sizes shown in the contract.
2.Manufacturers producing such items are shown in the contract.
730.02 Material Requirements
1.Expansion and contraction move ments shall be entirely taken by the neoprene.
2.Strip seals shall be complete with curb units, where specified in the contract, and shall be integral with the deck units or otherwise so designed and installed to thoroughly seal the joint against leakage.
3.Structural Steel:
a.Structural steel for extrus ions shall conform to the minimum requirements of ASTM A 709/A 709M, Grade 36, Grade 50, or Grade 50W steel.
b.All exposed surfaces of the extrusions (except weathering grade steel surfaces) shall be painted with a primer in accordance with Section 709. The finish coat is not required.
c.As an alternate, steel ex trusions may be galvanized in accordance with ASTM A 123.
4.The steel extrusions shall be made of one continuous piece unless approved by the engineer. If the steel extrusions are made of more than one piece, they shall be welded at the joints or otherwise adequately bonded together so as to obtain a tight seal.
5.The neoprene seal shall be m ade of one continuous length, and no splicing shall be allowed except where specifically called for in the contract.
6.The neoprene seal shall be m anufactured from polychloroprene, meeting the physical property requirements in Table 730.01.
730.03 Construction Methods
1.The Contractor shall provide setting or installation plans for the Engineer's approval. The Contractor shall install the strip seals in accordance with the manufacturer's instructions and recommendations.
2.The Contractor shall install strip seals on a properly prepared surface.
3.The Contractor shall protect the installed seals against damage from equipment by placing wood planks al ong the seals or by other suitable methods.
730.04 Method of Measurement
1.The expansion joint system shall be measured for payment by the linear foot (meter) of joint properly in stalled and accepted by the Engineer. Strip Seals 730.05 - 649 - 2. Pay limits for expansion joints shall be the horizontal distance from end to end along the centerline of the jo int assembly at the locations shown in the contract and 12 inches ( 300 mm) upward at the gutter lines. Table 730.01 Polychoroprene Requirements Property ASTM Test Requirements Tensile Strength Elongation at Break Hardness D 412 D 412 D 2240 (modified) 2,030 psi (14 MPa), min. 250% min. 60±5 points Durometer A 20% max. Compression Set 70 hours at 212°F Ozone Resistance Exposed to 300 pphm ozone for 70 hours at 104°F. Sample under 20% strain. Oil Deterioration Weight increase after immersion in ASTM oil #3 for 70 hours at 212°F D 395 Method B (modified) D 1149 D 471 No Cracks 45% Max.
730.05 Basis of Payment
1.P a y I t e m P a y U n i t Strip Seals Lin ear Foot (LF) [Meter (m)]
2.Payment is full compensation for all work described in this Section. - 650 - SECTION 731 -- JACKING CUL VERT PIPE, SEWER PIPE, AND CASING
731.01 Description
1.This work consists of jacking culvert pipe, sewer pipe, or pipe for casings and other uses through an embankment at the locations shown in the contract.
731.02 Material Requirements
1.Pipe shall meet the Division 1000 requirements for the type shown in the pay item.
731.03 Construction Methods
1.The Contractor shall jack the pipe into the locations shown in the contract.
2.The limits of open trench excavati on will be shown in the contract.
3.The Contractor shall excavate ahead of the pipe when necessary to the minimum diameter that will allow jacking the pipe through the embankment. The bottom of the excavation shall be to the exact grade for the bottom of the pipe, and clearance of the top shall not be more than 1 ½ inches (38 mm).
731.04 Method of Measurement
1.Jacking of pipe or casing will be measured and paid for by the linear foot (meter) of each respective size and type of pipe or casing jacked.
731.05 Basis of Payment
1.P a y I t e m P a y U n i t Jacking _____ inch (mm) _____ Pipe Linear Foot (LF) [Meter (m)] Jacking _____ inch (mm) _____ Pipe, Linear Foot (LF) Class _____ [Meter (m)] Jacking _____ inch (mm) _____ Pipe, Linear Foot (LF) Type _____ [Meter (m)]
2.The pipe or casing is paid for separately.
Source: Nebraska Standard Specifications for Highway Construction, 2017 Edition. Pages 682–683 of 1,048.