Delaware Standard Specifications for Road & Bridge Construction — Section 1070

GUARDRAIL SECTION 720 389 720.3.2 Rail Assembly.

A.Lap rails in the direction of traffic flow for the closest lane. Draw tight all bolts except those

through expansion joints. Tighten bolts through expansion joints as tight as possible without preventing the beams from sliding past one another longitudinally. Extend bolts at least 1/4 -inch beyond the nuts. Do not extend bolts necessary for adjustment more than 1/2 -inch beyond the nuts. Burr the last thread of post railing bolts to prevent removal.

B.Do not field cut holes in rails unless otherwise directed in the contract. If holes must be field cut,

mechanically punch or drill them. Remove all burs created by field cutting activities from the rail. 720.3.3 Offset Blocks.

A.Install new guardrail, using either wood or approved recycled composite offset blocks. Do not mix

different types of manufactured composite blocks or mix composite and wood blocks. Do not install composite offset blocks at wood posts.

B.Notch wood offset blocks in accordance with the Standard Construction Details only when

installing on steel posts. When installing wood offset blocks on wood posts, toenail the wood offset block in place using a 3 -inch long ceramic coated screw. Place the screw so that it penetrates both the wood offset block and wood post.

C.Install approved recycled composite offset blocks in accordance with the manufacturer’s

recommendations with no modifications. 720.3.4 Guardrail Reflectors.

A.Install guardrail reflectors in accordance with the Standard Construction Details.

720.3.5 Relocating Guardrail.

A.Remove existing guardrail in a manner that prevents damage. Replace hardware with new

hardware.

B.Reinstall and reset the guardrail system at the locations designated in the contract and in

accordance with Section 720.3, and the Standard Construction Details. If the existing guardrail has steel offset blocks, replace the offset blocks with offset bl ocks meeting the requirements of with Section 720.3.4.

720.36 Guardrail Over Culvert

Provide and install guardrail over culvert in accordance with the Standard Construction Details.

720.4Method of Measurement.

A.The Department will measure:

1.Guardrail from the center of end post to the center of end post, excluding barrier connections

and end treatments;

2.guardrail components as the number of each component provided, placed, and accepted by

limit of payment;

3.guardrail over culverts as the number of each provided, placed, and accepted by limit of

payment;

4.relocated guardrail as the number of linear feet of guardrail relocated and accepted .

GUARDRAIL SECTION 720 390 720.5 Basis of Payment.

A.The Department will pay the quantity of guardrail installations, guardrail components, replacing

individual components, relocating guardrail, or guardrail over culverts at the contract unit price. New beam guardrail installation includes all posts, beams, hardware , and components. Price and payment will constitute full compensation for:

1.Pre-installation field meeting;

2.test pits;

3.providing and placing materials and components;

4.fabricating;

5.excavating;

6.required transition sections;

7.guardrail reflectors;

8.burring bolts;

9.backfilling;

10.grading;

11.compacting;

12.disposing of surplus materials and components; and

13.patching material around posts.

B.The Department will not pay for repairing damaged subsurface facilities caused by post

installation. ITEM DESCRIPTION UNIT 720001 GALVANIZED STEEL BEAM GUARDRAIL (WOOD POST) LF 720002 GUARDRAIL TO BRIDGE GUARDRAIL TRANSITION LF 720004 STEEL RAIL ELEMENT, STRAIGHT LF 720005 STEEL RAIL ELEMENT, CURVED LF 720006 GALVANIZED STEEL POSTS EACH 720007 SHORT WOOD BREAKAWAY POST, TREATED EACH 720008 TREATED WOOD BLOCK EACH 720009 TERMINAL CONNECTOR, BRIDGE AND BARRIER EACH 720010 GALVANIZED RAIL ELEMENT, THRIE BEAM EACH 720011 GALVANIZED TRANSITION SECTION, THRIE BEAM EACH 720012 GALVANIZED STEEL POST, THRIE BEAM EACH 720013 GALVANIZED STEEL BRACKET, THRIE BEAM EACH 720017 GALVANIZED RAIL ELEMENT EACH 720018 GALVANIZED STEEL POST, 7' EACH

Source: Delaware Standard Specifications for Road and Bridge Construction, 2025 Edition. Pages 399–400 of 779.

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71104 6 INSTALLING SANITARY SEWER (FORCE MAIN) BY BORING, PE, 6" LF

72000 1 GALVANIZED STEEL BEAM GUARDRAIL (WOOD POST) LF

1070and the Standard Construction Details. Install new guardrail reflectors in accordance

720.36 Guardrail Over Culvert

720.4Method of Measurement.