Art. 728.03 Telescoping Steel Sign Support
728.03 General. The estimated length of a support includes the total length of
all required sections. When two or more posts support the same sign, they shall be erected parallel to each other with the tops of the posts at the same elevation. The sign locations shall be staked by the Contractor and approved by the Engineer prior to installation of the posts. The Contractor shall be responsible for the proper elevation, offset, and orientation of all signs as indicated in the plans or as directed by the Engineer. When the support specified is too long, the Contractor may choose to cut the top section or telescope the top section farther into the base section. Any section cut shall have the cut end completely deburred. When signs are to be placed on adjacent post sides and the posts have holes in only two opposite sides, the Contractor shall drill any additional holes necessary to the tolerances according to Article 1093.01(c). The top section may be spliced. Splicing shall be done according to the plans and will only be permitted in the upper third of the top section. Only one splice per support will be permitted. The internal splice member shall be 1 3/4 x 1 3/4 in. (45 x 45 mm).
728.04 Installation Methods. Installation methods shall be as follows.
a.Pavement Mount. Pavement mounted installation shall be used only in paved areas and shall consist of three sections as shown in the plans. The base sections may be installed before or after the paving operation, except a hole no greater than 6 in. (150 mm) in diameter shall be cut in the pavement. Any pavement removed shall be neatly replaced around the base section with like material to the depth of the original pavement. The 2 1/4 x 2 1/4 in. (57 x 57 mm) base section shall be driven by hand or mechanical means to a minimum depth of 34 in. (850 mm) measured from the pavement surface. The top of the base section shall be protected by a suitable driving cap. When required by the Engineer, the earth around the support shall be compacted after driving. The sleeve section shall be telescoped over the base section or may be driven with the base section as a unit. The tops of both sections shall be at the same elevation, with the bolt holes aligned. The 2 x 2 in. (50 x 50 mm) top section shall be telescoped into the base section a minimum of 8 in. (200 mm) and a maximum of 12 in. (300 mm) and the three sections fastened together as shown in the plans.
b.Ground Mount. Ground mounted installations shall consist of two sections as shown in the plans. The 2 1/4 x 2 1/4 in. (57 x 57 mm) base section shall be driven by hand or mechanical means to a minimum depth of 5 ft (1.5 m) measured from the ground line or as shown in the plans. The top of the base section shall be protected by a suitable driving cap. When required by the Engineer, the earth around the support shall be compacted after driving. Metal Post Art. 729.03 The 2 x 2 in. (50 x 50 mm) top section shall be telescoped into the base section a minimum of 8 in. (200 mm) and a maximum of 12 in. (300 mm) and the two sections fastened together as shown in the plans.
c.Base Casting. Base casting shall consist of two sections as shown in the plans. The base section shall be 2 1/4 x 2 1/4 x 8 1/2 in. (57 x 57 x 216 mm). This section shall be inserted at least 6 3/4 in. (170 mm) into the base casting to form a shim into which the 2 in. (50 mm) section is placed. The top section shall be inserted at least 6 3/4 in. (170 mm) into the base casting. After the top section is in place, the installation shall be bolted together as shown in the plans.
728.05 Method of Measurement. This work will be measured for payment in
feet (meters). The length measured will be the total length of all sections installed, except for any internal splice members and any telescoping of a top section more than 12 in. (300 mm) into a base section.
728.06 Basis of Payment. This work will be paid for at the contract unit price
per foot (meter) for TELESCOPING STEEL SIGN SUPPORT. Payment for the base casting will be made according to Section 731. SECTION 729. METAL POST
729.01 Description. This work shall consist of furnishing Type A and/or
Type B metal posts, and installing them utilizing the direct burial method.
729.02 Materials. Materials shall be according to the following.
Item Article/Section
a.Metal Post .......................................................................................... 1006.29 CONSTRUCTION REQUIREMENTS
729.03 General. The metal posts may be driven by hand or mechanical
means to a minimum depth of 3.5 ft (1.0 m) for Type A or 4.0 ft (1.2 m) for Type B. The depths shall be measured from the ground line. The post shall be protected by a suitable driving cap and when required by the Engineer, the material around the post shall be compacted after driving. Scratching, chipping, or other damage to the posts shall be avoided during handling and installation. If chips and/or scratches occur, the areas shall be recoated in the field by a method meeting the coating manufacturer's recommendations. Chips and scratches totaling more than five percent of the surface area of any one post and/or more than five percent of the surface area in any 1 ft (300 mm) segment of any one post shall be cause for rejection of the post.
Referenced in this section
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Source: Illinois Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 659–660 of 1,217. View official source ↗