571Structural Plate Structures

571.1DESCRIPTION

The Work consists of providing and installing pipe, pipe arches , long span Structures or metal box Culverts made of metal structural plate and foundatio n elements for such structures, in accordance with Table 571.1:1, “Structural Plate Specificati ons: AASHTO,” and Table 571.1:2, “Structural Plate Specifications: ASTM.”

Table 571.1:1 Structural Plate Specifications: AASHTO Category/parameter Material Designa Installationb Backfill Structural plate Galvanized M 167 Sect. 12 Sect. 26 M 145 Aluminum M 219 Sect. 12 Sect. 26 M 145 Box Culvert Aluminum M 219 Sect. 12 Sect. 26 M 145 Galvanized M 167 Sect. 12 Sect. 26 M 145 Coatings, pavements, and linings Asphalt coating — — M 243M — Paved invert — — — — aAASHTO LRFD Bridge Design Specifications bAASHTO LRFD Bridge Construction Specifications

Table 571.1:2 Structural Plate Specifications: ASTM Category/parameter Material Design Installation Backfill Structural plate Galvanized A 761 — A 807 — Aluminum B 746 B 790 B 789 — Box Culvert Aluminum B 864 — B 789 — Galvanized A 964 A 807 Coatings, pavements, and linings Asphalt coating — — A 849 — Paved invert — — A 849 — Nuts and bolts Galvanized plate A 449 — — — Aluminum plate A 307 or A 449 & A 153 — — — Aluminum box Culvert A 307 or A 449 & A 153 — — —

571.2MATERIALS

571.2.1 General

The Contractor may provide aluminum or steel Structures, unless otherwise specified in the Contract.

Section 571: Structural Pla te Structures Page 600 The Contractor shall not mix aluminum and steel Materials in an installation, except as specified for galvanized steel bolts and nuts on structural alu minum plate Structures.

571.2.2 Structural Plates

The Contractor shall provide steel structural plates in accorda nce with AASHTO M 167.

The Contractor shall provide aluminum structural plates in acco rdance with AASHTO M 219.

571.2.3 Fasteners

The Contractor shall provide fasteners for steel structural pla tes in accordance with AASHTO M 167.

The Contractor shall provide fasteners for aluminum plate Struc tures in accordance with AASHTO M 219.

571.2.4 Asphalt Coating If required, the Contractor shall protect structural plate Stru ctures with asphalt coating in accordance with AASHTO M 190. The Contractor shall provide fie ld-applied coatings in accordance with AASHTO M 243.

The Contractor shall coat the fasteners extending outside of th e pipe after installation. The Contractor may leave the portions of the fasteners extendin g inside the pipe uncoated.

571.2.5 Design and Certification Requirements 571.2.5.1 Design

The Contractor is responsible for the structural and foundation designs of metal box Culverts and other structural plate Structures. Geotechnical b oring log summaries and hydraulic scour depths will be provided by NMDOT. The Contract or shall design structural plate Structures in accordance with Section 10 and 12 of AASHTO ’s LRFD Bridge Design Specification . At least 30 Days before beginning fabrication, the Contractors hall submit to the Project Manager three (3) sets of the following Stamped by a New Mexico Professional Engineer:

Structures and metal box Culverts. New Mexico Professional Engineer Stamp and foundation designs a re not required for Structural plate Structures with structural inverts under 18 fe e t m a x i m u m . T h e P r o j e c t Manager will return one (1) set, with notations, to the Contrac tor within 14 Days. The Contractor shall make the appropriate corrections and resubmit eight (8) sets of calculations and Working Drawings to the Proj ect Manager for final review an d approval. Seven (7) additional Days shall be allotted for final review.

The Contractor shall not fabricate Materials until receipt of w ritten notification of the Department's Working Drawings approval.

Section 571: Structural Pla te Structures Page 601 571.2.5.2 Certifications

The Contractor shall provide certificates to the Project Manage r in accordance with Section 12 of AASHTO M 167 for Steel Structural Plates or Secti on 11 of AASHTO M 219 for Aluminum Structural Plates, and the Specifications, before inst alling the Structure at the Project site.

571.3CONSTRUCTION REQUIREMENTS

571.3.1 Assembling

When practical, the Contractor shall connect plates with the se ams and stagger them so that no more than three (3) plates come together at one (1) poi nt.

The Contractor shall assemble str uctural plate Structures using bolts with a minimum 3/4 inch diameter.

If assembling steel structural plates, the Contractor shall apply from 100 lbf•ft to 300 lbf•ft of torque.

If assembling aluminum structural plates, the Contractor shall apply from 100 lbf•ft to 200 lbf•ft of torque.

The Contractor shall tighten t he longitudinal seams of joined p lates, except for plates held in shape by cables, struts, or backfill. 571.3.1.1 Assembly Tolerances

The Contractor shall ensure that the plates do not vary from th e specified dimension before backfill by more than two percent (2%) of the longest di mension (span or rise) or five

restriction for horizontal ellipse shapes having a ratio of top to side radii of three (3) or less. When the rise of arches with a ratio of top to side radii of th ree (3) or more, the Contractor shall ensure that they do not var y from the specified dimension by more than one percent (1%) of the span.

571.3.1.2 Welding The Contractor shall weld steel in accordance with ANSI/AASHTO/ AWS Bridge Welding Code D1.5. The Contractor shall weld aluminum in accordance wi th AWS Structural Welding Code D1.2.

The Contractor shall ensure that qualified welders perform shop and field welding in accordance with Section 5 of ANSI/AASHTO/AWS Bridge Welding Cod e D1.5.

The Contractor shall perform welding on steel plates (other tha n fittings) before galvanizing. 571.3.2 Rejection of Damaged Materials

The Department may reject damaged or defective structural plate Structures or structural plates at any time during the construction operations, regardle ss of prior approval. The Contractor shall replace installed Structures or plates tha t are damaged or that fail to

Section 571: Structural Pla te Structures Page 602 meet the restrictions of structure shape in accordance with Section 571.3.1.1, “Assembly Tolerances,” at no additional cost to the Department.

571.3.3 Movement Monitoring In long span structural plate Structures; the Contractor shall place movement control devices at locations specified by the manufacturer for the enti re length of the Structure. The Contractor shall ensure that a qualified manufacturer’s represe ntative continually monitors long-span structural plate Structures for movement to detect ex cessive distortion of the Structure shape due to progressive plate assembly, and Equipmen t and backfilling operations. Long span structural plate structures are defined in Section 12 .8 of the AASHTO LRFD Bridge Design Specifications.

The Department will determine excessive distortion in accordanc e with Section 571.3.1.1, “Assembly Tolerances,” and as a radius change more than 33% of the lower side plate of high-profile arches and the side plate of pear-shaped Structures. Upon completion of the Structure, the Contractor shall submit t he movement measurement records to the Project Manager with a statement cer tifying that any movements were within acceptable limits. 571.3.4 Excavation

The Contractor shall perform excavation in accordance with Section 206, “Excavation and Backfill for Culverts and Minor Structures.” 571.3.5 Bedding and Backfill

The Contractor shall construct bedding Material for Culverts wi th closed bottoms in accordance with Section 206, “Excavation and Backfill for Culve rts and Minor Structures.”

The Contractor shall ensure that the backfill and bedding are i n accordance with Table 571.3.5:1, “Electrochemical Criteria,” to ensure a 50-yea r service life.

Table 571.3.5:1 Electrochemical Criteria Type of Material pH AASHTO T 288 Resistivity, ohm-cm AASHTO T 288 Soluble salts, S0 4,% by weight Galvanized steel 2 oz. coating 5.8–8.0 >2,000 0.05 Galvanized steel 3 oz. coating 5.0–10.0 >2,000 0.05 Asphalt coating a >2,000 0.075 Aluminum plate 4.0–9.0 >500 0.125 aLower the pH range of the galvanized pipe by one (1).

571.3.6 Backfill The Contractor shall ensure that backfill Material is in accordance with soil classification A-1 or A-3 in AASHTO M 145, and compact it to at least 90% of m aximum density in accordance with AASHTO T 180 (Modified Proctor), Method D (TTCP Modified).

Section 571: Structural Pla te Structures Page 603 To avoid damaging the Structure, the Contractor shall compact t he initial two (2) ft of backfill over the crown of the Structure with hand held Equipme nt or small compaction machinery. The Department defines the crown as the area betwee n the points of compound curvature of top and side plates or the area between the locati on of longitudinal structural stiffeners.

The Department will not apply density requirements to the first t w o ( 2 ) l i f t s o f b a c k f i l l placed over the crown of the Structure. The Contractor shall n ot allow heavy machinery on the Structures, except for metal box Culverts, until the fill o ver the Structure is at least four

571.3.7 Repair of Damaged Coating

The Contractor shall repair damaged protective coating in accor dance with AASHTO M 167 at no additional cost to the Department. The Contractor sh all use zinc-rich paint in accordance with Section 546 Recoating Structures.

571.4METHOD OF MEASUREMENT

The Department will measure all Structural Plate Structure pay items by the linear foot.

571.5BASIS OF PAYMENT

Pay Item Pay Unit Structural Plate Pipe Linear Foot Structural Plate Pipe Arch Linear Foot Metal Box Culvert Linear Foot

Excavation, disposal of unsuitabl e Material, select backfill Ma terial, placement and compaction of select backfill shall be included in the Bid Item Unit Price for each relevant pay item.

571.5.1 Work Included in Payment

The following Work and items will be considered as included in the payment for the major items and will not be measured or paid for separately:

and

Division: 600 Page 604 DIVISION 600 – MISCELLANEOUS CONSTRUCTION

Division: 600 Page 604 DIVISION 600 – MISCELLANEOUS CONSTRUCTION

Section 601: Removal of Structures and Obstructions Page 605