Delaware Standard Specifications for Road & Bridge Construction — Section 1039.8

STEEL SIGN STRUCTURES SECTION 617 306

617.1Description.

This work consists of providing, fabricating, and erecting steel sign structures.

617.2Materials.

A.Cantilever, Center Mount , Monopipe, or Overhead with Single Plane Truss.

1.Columns, Struts, and Truss Chords. Section 1039.8 .E

2.Truss Webs and Truss Verticals. ASTM A53, Grade B, Type E or S for Tubular Members; or

Section 1039.8 for pipe and tubing.

3.Steel Angles, Shapes, Plates and Backing Rings. Section 1039.1

B.Overhead with Tri-Chord or Box -Shaped Truss. Sections 617.2.A.1 and 617.2.A.2.

C.Fabricated Structural Steel. Section 1039.1

D.U-bolts, Nuts, Washers , and Direct Tension Indicators. Section 1039.2

E.High -Strength Fasteners. Section 1039.3

F.Anchor Bolts, Nuts, and Washers. Section 1039.4

G.Galvanizing Section 1039.10

H.Galvanized steel screen - 1/2-inch by 1/2 -inch mesh and 0.063 -inch diameter galvanized steel

wires.

617.3Construction.

A.Submittals.

1.Submit documentation in accordance with Section 615.3.A.

2.Submit working drawings in accordance with Section 615.3.A. On fabrication drawings, identify

the splice and weld locations, type, size, process, and method and procedure for non - destructive testing. Field -verify dimensions before submitting working dra wings.

3.Submit erection plan in accordance with Section 615.3.A.

4.Obtain the engineer’s approval for alternate designs. Provide structurally equivalent alternate

designs. The engineer may reject alternate designs for any reason.

B.Fabricate in accordance with Section 615.3.B., except as noted below:

1.For welds, comply with AWS D1.1 structural welding code as well as the additional requirements

of AASHTO LRFD Specifications for Structural Supports for Highway Signs, Luminaires, and Traffic Signals, Section 5.14.

2.Perform and evaluate non -destructive weld testing according to cyclically loaded non - tubular

tension criteria.

a.The Department's plant inspector will select weld locations and weldments for testing.

STEEL SIGN STRUCTURES SECTION 617 307 b. Perform the following minimum ultrasonic testing of complete joint penetration (CJP) groove welds.

i.25 percent of the length of CJP groove welds connecting each:

(1)Flange splice plate to the truss chords;

(2)base plate to the tower columns;

(3)connection plate to the chords or columns;

(4)CJP weld on truss seat plates; and

(5)CJP longitudinal seam weld on cantilever and center -mount sleeves.

(6)If a defect occurs that warrants rejection, test 100 percent of the weld on that element.

ii. 100 percent of the length of CJP groove welds on monopipe structures. iii. 100 percent of the groove weld length on at least 25 percent of the number of similar -type connections of web members to the truss chords.

(1)If any defect is found that warrants rejection, double the testing frequency until no defects

warranting rejection are found.

c.Perform the following minimum magnetic particle inspection (MT) of fillet welds and partial

joint penetration (PJP) groove welds.

i.For intermediate member connections, perform MT on 100 percent of the weldment length

on at least 25 percent of the total number of connections on trusses and towers.

(1)If any defect is found that warrants rejection, double the testing frequency until no defects

warranting rejection are found. ii. For welds on truss seat plates, base plates, cantilever and center -mount sleeves, and alternate press -break members and fillet welds connecting backing rings to base plates and flange splice plates, perform MT on a minimum of 25 percent of the totalle ngth of each weld.

(1)If a defect occurs that warrants rejection, test 100 percent of the weld on that element.

iii. For welds attaching handhole frames to columns, MT 100 percent of the length of each weld. iv. For all other connections, MT 100 percent of the weldments on at least 10 percent of the total number of connections.

(1)If any defect is found that warrants rejection, double the testing frequency until no defects

warranting rejection are found.

d.Perform ultrasonic inspection of the groove weld prior to welding the top of the backing ring.

Perform 100 percent ultrasonic inspection (UT) of butt welds in rings 5/16 -inch and thicker. Perform 100 percent MT on rings less than 5/16 -inch thick.

e.If necessary repair base connection welds 1 time. Re -test all repairs. If more than 1 repair is

necessary, obtain approval from the engineer before proceeding.

3.Fabricate backing rings as a continuous ring or butt -welded with a full -penetration weld.

STEEL SIGN STRUCTURES SECTION 617 308 4. Form columns for monopipe sign structures to the radii shown in the contract in accordance with the Tube and Pipe Association International Recommended Standards for Induction Bending of Pipe and Tube (TPA -IBS-98).

5.Galvanizing.

a.Galvanize steel members and fasteners in accordance with Section 1039.10.

b.Fabricate steel sign structure into the largest practical unit before galvanizing. Do not fabricate

steel sign structure until obtaining approval of splice locations.

C.Excavate and construct the foundations in accordance with the contract. Slope top of sign

pedestal 4 percent from center to near edges for drainage.

1.Construct drilled shafts in accordance with Section 606.

2.Construct spread footings in accordance with Sections 207, 209, 610, and 611.

3.Anchor Bolts.

a.Use steel templates provided by the fabricator to set the elevation and alignment of tower

base anchor bolts. Brace the bolts against movement before placement of concrete.

b.Pretension anchor bolts according to the following procedure:

i.Verify that the nuts will turn onto the bolts past the elevation corresponding to the bottom

of each in -place leveling nut. Ensure that it is possible for 1 person, using a 12 -inch-long wrench, to back the nuts off without employing a pipe extension on the wrench handle. ii. Clean and lubricate the exposed threads of all anchor bolts. Clean and lubricate the threads and bearing surfaces of all leveling nuts. Re -lubricate if more than 24 -hours elapses before installing the leveling nuts, or if the anchor bolts and leveling nuts become wet between lubrication and installation. iii. Turn the leveling nuts onto the anchor bolts and align the nuts to the same elevation. iv. Place structural washers on top of the leveling nuts with 1 washer corresponding to each anchor bolt.

v.Install the base plate atop the leveling nuts, place structural washers on top of the base

plate, with 1 washer corresponding to each anchor bolt, place 1 direct tension indicator on each washer, and turn the top nuts onto the anchor bolts. vi. Tighten top nuts to a snug -tight condition in a star pattern. The definition of snug -tight is the maximum nut rotation resulting from 1 person using a 12 -inch -long wrench or equivalent. A star tightening pattern is when nuts on opposite or near -opposite sides of the bolt circle are successively tightened in a pattern resembling a star. For an 8 -bolt circle with bolts sequentially numbered 1 to 8, tighten nuts in the following bolt order: 1, 5, 7, 3, 8, 4, 6, 2. vii. Tighten leveling nuts to a snug -tight condition in a star pattern. viii. Before final tightening of the top nuts, mark the reference position of each top nut in a snug -tight condition with a marking on 1 side with a corresponding reference mark on the base plate at each bolt. Incrementally turn the top nuts using a star pattern until achieving the required nut rotation in accordance with Section 615, Table 615.3 -4. Turn the nuts in at least 2, full tightening cycles. After tightening, verify the nut rotation. ix. Tighten second nut of double -nut assembly to snug -tight. STEEL SIGN STRUCTURES SECTION 617 309 c. Verify base plate is in full contact with all flat washers.

d.Burr off threads of anchor bolts at the face of the nut after installation of column.

4.Use a galvanized steel screen to seal the gap between the base plate and the foundation. Cover

the entire gap with a wire screen. Ensure that the bottom horizontal wire remains in full contact with the surface of the concrete foundation and the top hori zontal wire does not extend beyond the top surface of the base plate. Do not allow vertical screen wires to extend beyond the top and bottom horizontal wires of the screen. Use 1 continuous section of screen with only 1 overlapping splice where the ends co me together. Overlap the layers 3 -inches minimum. Attach the screen to the vertical side of the base plate with No. 8, 1/2 -inch long self -tapping stainless - steel screws with 1/4 -inch inside diameter stainless -steel washers. Drill pilot holes into the base plate to facilitate screw installation. Install screws on 9 -inch centers maximum with at least 1 screw installed through the overlapping splice to clamp the layers together. Clamp the overlapping splice layers together just above the concrete foundation. Clamp with an all - stainless -steel f astener assembly consisting of a No. 8, 5/8 -inch long machine screw, a nut, two 1/4-inch inside diameter flat washers, and a lock washer. Clamp the screen layers between the flat washers.

617.4Method of Measurement.

A.The Department will not measure the quantity of steel sign structures placed and accepted.

617.5Basis of Payment.

A.Price and payment constitute full compensation for:

1.Submittals;

2.alternate designs;

3.providing materials;

4.fabrication;

5.welds;

6.transporting;

7.assembly;

8.installing steel sign structures;

9.hardware; and

10.repairs and preparation for galvanization.

B.The Department will pay for:

1.Drilled shafts in accordance with Section 606;

2.reinforcement in accordance with Section 611; and

3.sign panels in accordance with Sections 818 and 822.

C.Submit the breakout sheet included in the proposal that lists all of the steel sign structures under

this item. Fill in a unit price for each steel sign structure. The lump sum bid for the respective pay STEEL SIGN STRUCTURES SECTION 617 310 item will be the sum of the price for all sign structures listed on the breakout sheet. Submit the breakout sheet for lump sum items in accordance with Section 109. ITEM DESCRIPTION UNIT 617000 STEEL SIGN STRUCTURE, TUBULAR ARCH, CANTILEVER LS 617001 STEEL SIGN STRUCTURE, TUBULAR ARCH, OVERHEAD LS 617002 STEEL SIGN STRUCTURE, TRUSS TYPE, CANTILEVER LS 617003 STEEL SIGN STRUCTURE, TRUSS TYPE, OVERHEAD LS 617004 STEEL SIGN STRUCTURE, BRIDGE MOUNTED LS 617005 STEEL SIGN STRUCTURE, CENTER MOUNT LS

Source: Delaware Standard Specifications for Road and Bridge Construction, 2025 Edition. Pages 316–320 of 779.

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617 — STEEL SIGN STRUCTURES

61700 0 STEEL SIGN STRUCTURE, TUBULAR ARCH, CANTILEVER LS

1039.8for pipe and tubing

617.1Description.

617.2Materials.

617.3Construction.

617.4Method of Measurement.

617.5Basis of Payment.