Precast Concrete & Masonry

What precast plants ship

Precast products are engineered pieces, not interchangeable pallets. Wall panels are commonly 4–10 inches thick, up to 40 feet long by 12 feet wide, and 15,000–50,000 lb each. Plants also ship double-Ts, hollow-core planks, bridge beams, jersey barriers, 18–72-inch pipe sections, and palletized retaining-wall blocks.

Dunnage is part of the design

Panels sit on hardwood timbers or rubber pads at specified support points. Those points distribute bending forces; moving them can crack a panel even when the chains remain tight. A wrong dunnage layout can turn a $15,000 panel into a $100,000 replacement and delay a pour. Get the manufacturer’s sketch before dispatch and keep it with the load documents. Do not substitute random 4x4s because the trailer has them.

Most plants crane-load through embedded lift inserts. The crane rating must match panel weight with at least a 4:1 safety factor. The plant rigging crew connects the inserts; the driver handles trailer securement. Large panels use heavy chains, while stacked barriers may use approved banding. Wood cribbing, rubber bumpers, or panel-specific blocking prevents concrete faces from touching in transit.

Bridge beams are planned months ahead

AASHTO Type I through Type VI beams range from roughly 12 to 72 inches in depth and from 40 to 100-plus feet in length. Prestressed girders carry substantial weight and have engineered pick points; they are not simply long structural pieces that can ride on any 48-foot flatbed. Large spans enter SUPERLOAD territory because length, gross weight, axle spacing, and overhang affect every bridge and turn on the route.

The producer and carrier survey bridge clearances, railroad crossings, turns, utilities, and road restrictions. Escort requirements vary by state; pilot cars, police escorts, or traffic control may be needed. Permit work commonly takes two to four weeks. Producers schedule these moves months ahead, reserving a specialized trailer, crane, escorts, and an erection date.

The beam’s lift diagram, center of gravity, bearing points, and dunnage arrangement travel with the load. The destination must have a crane with adequate radius and capacity, not merely a crane rated for the beam’s gross weight. A late permit or missing escort can idle an erection crew and strand a 90-foot beam at a safe staging point.

Precast pipe and nested loads

Reinforced Concrete Pipe, or RCP, commonly ships in 18-, 24-, 36-, 48-, 60-, and 72-inch diameters. An 18-inch Class III joint weighs about 500 lb for an 8-foot section; a 48-inch joint is approximately 3,200 lb for the same length. The bell and spigot geometry controls how sections can be nested and where blocking must sit.

Smaller pipe can be nested to use the trailer deck efficiently. A shipper may stack two layers of 18-inch pipe on a flatbed, using approved separators and keeping the lower tier from bearing on bells. Larger pipe normally rides in cradles or timber supports with the bell protected. Securement may use chains through the pipe bell or approved openings, with blocking that prevents rolling without damaging the concrete edge. Never run a bare chain across an unprotected bell.

The receiving crew needs pipe count, class, joint length, gasket status, and unload order. A 48-inch joint at 3,200 lb may be manageable with a site excavator, but nested pipe needs equipment to separate the upper layer. Tell the carrier whether pipe is staged along a trench line or dropped at a yard.

Sequenced deliveries and failure modes

A cast-in-place structure is poured and erected in sequence. If load four reaches the site before load one, the crane cannot place it simply because it is available; the piece may sit in a street or consume the staging area. A mobile crane with operator and oiler costs roughly $450–$900 per hour. Two hours of idle time is $900–$1,800 before anyone discusses freight.

Typical failures include misplaced dunnage, a driver delivering to the wrong bay, truck two arriving before truck one, and a crane crew that does not know the first truck is 20 minutes away.

Dock Optimizer ties each truck to the erection sequence and crane plan. Dispatch can release trucks in reverse departure order so the intended first piece arrives first. A shared board shows all ETAs, check-in, crane loading, and site arrival. The crane foreman receives a 30-minute alert. If traffic slows truck three, the superintendent can adjust the release of truck four instead of creating an out-of-sequence queue.

Worked example: six loads for a parking structure

A parking project has 12 panels in a six-flatbed sequence. The trucks leave a precast plant over 90 minutes and should arrive over 3.5 hours. The mobile crane costs $600 per hour. Without scheduling, load four arrives first and the crew idles two hours while loads one through three catch up: $1,200 in crane cost and no useful placement.

With the sequence entered before dispatch, the plant releases the final departure first and the first-piece truck on the correct appointment. Each driver receives the bay number and dunnage instruction. The crane foreman sees the first truck’s 30-minute alert, keeps the rigging crew ready, and tracks the remaining five ETAs. All six arrive in window, the pour proceeds without interruption, and the site avoids a crane bill caused by ordering rather than concrete.

On day two, the planned sequence is not treated as permanent. Suppose the crew placed only eight of the planned ten panels on day one because wind stopped lifts for 90 minutes. At 6:00 a.m., the superintendent enters actual pour progress and identifies the next four required piece IDs. Dock Optimizer re-sequences trucks 7–10 against that live placement plan, holds a truck carrying a later piece at the plant, and moves the correct panel into the first open window. Drivers receive the revised bay and ETA; the crane crew receives a new 30-minute alert. The project absorbs the lost time without creating an out-of-sequence delivery or paying a second idle-crane block.

Documents and site controls

The shipping packet should carry piece ID, weight, lift-point diagram, dunnage layout, and destination bay. Confirm a waiting area, spotter, one-way haul road, and any street-occupancy permit.

Weather can change the plan. Wind limits may prevent lifting a tall panel even when the truck arrived on time. Visibility lets the superintendent hold a truck at the plant or move the sequence while the driver is safe and legal.

Post precast for the actual lift

List piece weight, dimensions, lift inserts, dunnage layout, blocking, chain requirements, bay sequence, crane capacity, site access, pipe class where applicable, and delivery date. Post the load in FlatbedEasy so the carrier and erection team see one release plan.