Railroad Bridge Plan Review: 112 Issues in Plans & Specs

The project

A major railroad bridge project involving drilled shaft foundations, secant walls, structural steel girders, and multiple retaining walls. InspectMind performed a comprehensive cross-check of the 49-sheet drawing set against project specifications, identifying critical conflicts between drawings and specs, impossible geometric conditions, and fundamental documentation gaps that would have caused construction delays and costly RFIs.

Project type

Railroad bridge · infrastructure · UPRR

Codes referenced: AREMA · UPRR Guidelines · AASHTO · ASTM F3125 · Cooper E80

Sample findings

1. Impossible anchor bolt geometry

   Critical

   Anchor bolt length of 1'-6" equals embedment depth of 1'-6", zero projection available for bearing assembly, yet detail shows bolt projecting through masonry plate, washer, and nut.

2. Bolt specification vs installation method conflict

   Critical

   Drawing specifies ASTM F1852 twist-off bolts, but spec requires F3125 with turn-of-nut tightening. F1852 bolts cannot be installed using turn-of-nut method.

3. Drilled shaft clear cover deficiency (3" vs 5")

   Critical

   Multiple sheets show 3" clear cover for drilled shafts, but specification requires 5" minimum. This 2" deficiency affects all foundation elements.

4. Bill of Material shows zero quantities

   Critical

   All pay items (concrete, reinforcement, drilled shafts) show quantity of zero. This is an unpopulated template that prevents bidding and procurement.

5. Compaction method contradiction (Standard vs Modified Proctor)

   High

   Drawing requires 95% Standard Proctor; spec requires 100% Modified Proctor near abutments. These are fundamentally different test methods with different compaction energy.

6. TIP wire count cannot form pairs (5 total)

   High

   Drawing specifies 5 thermal wires for TIP testing, but spec requires wires "in pairs." An odd number cannot form complete pairs for cage eccentricity detection.

Issue categories

Structural & foundations

Drilled shaft cover, concrete strength, anchor embedment issues

Fastener & connection conflicts

Bolt specs (F1852 vs F3125), anchor geometry, installation methods

Specification contradictions

Compaction, galvanizing, epoxy, lifting hook, and splice conflicts

Documentation & coordination

Zero BOM quantities, missing details, incomplete references

Value delivered

• 112 issues surfaced across 49-sheet drawing set
• Plan vs specification conflicts systematically identified
• AREMA and UPRR guideline compliance verified
• Impossible geometric conditions flagged before fabrication