You've got some good questions about how those street light poles are installed! Here's a breakdown of the process

Plumbing/Leveling a Tapered Pole:

You're on the right track with the idea of using a long level. However, the tapered shape of the pole makes it a bit more complex. Here's the general process:1. Foundation is Key

The most important thing is that the

foundation itself must be perfectly level. This is ensured during the concrete pouring process using standard surveying and leveling techniques. This includes using levels, transits, and laser levels.2. Using a Level and Shims (if necessary)

A long spirit level (like a 4-foot or even 6-foot level) is used against the pole. Because the pole is tapered, they don't just place the level directly on the pole. They may use a small, straight piece of lumber or metal bar to create a level surface to put the level against. This is placed vertically on the pole. They check the level in multiple directions (typically at least two, 90 degrees apart).

Shims

If the pole isn't perfectly plumb, shims (small, thin pieces of metal or plastic) are carefully inserted between the pole base and the foundation plate. This is an iterative process. They adjust shims and re-check the level until the pole is perfectly plumb in all directions.3.

Plumb Bob (alternative/supplement)

For taller poles, a plumb bob can be used. A plumb bob is a weight suspended on a string, and when hanging freely, it points directly downward, establishing a true vertical line. They can compare the pole's alignment to the plumb line.4.

Anchor Bolt Adjustment

The anchor bolts are attached to a template that keeps them aligned during the pour. The template can be adjusted to keep the bolts in the correct position.

Keeping the Pole "Floating" During Concrete Pouring

Your second question is about how the pole is held in place while the concrete cures. Here's how they do it:1.

Anchor Bolts

The most common method is to use

anchor bolts that are embedded in the concrete foundation. A circular template with the required hole positions is installed over the anchor bolts. These bolts extend upward from the concrete foundation. The base of the pole has corresponding holes that line up with the anchor bolts. The pole is then lowered onto the anchor bolts. Washers and nuts are used to secure the pole to the anchor bolts.2. Template/Jig

Before the concrete is poured, a temporary template or jig is often used to hold the anchor bolts in the correct position and alignment. This ensures the pole will fit properly once it's installed.3.

One-Pour Method

In most cases, the entire concrete foundation is poured in a single operation. They don't typically pour a small amount of concrete, let it cure, and then come back the next day. That would create a weak point in the foundation. The anchor bolts are secured in place during the entire pour.4.

Temporary Bracing (if needed)

For very tall or heavy poles, temporary bracing might be used in addition to the anchor bolts to provide extra stability while the concrete cures. These braces would be removed once the concrete is strong enough to support the pole.

In summary: Leveling is done by ensuring the foundation is level, and then using a level/plumb bob and shims to fine-tune the pole's vertical alignment. The pole is held in place by anchor bolts embedded in the concrete foundation. The entire foundation is typically poured in one go.I hope this clarifies the process! Flag for review