Determine Correct Size

To determine the right size of manhole box for your job answer the questions below.

Review the tables and information which accompany our specific products.

Always refer to manufacturer’s serialized specific tabulated data and all applicable safety standards prior to each use.

What kind of job is it?  

Sewer, repair, water main, manhole, pump station, bore pit, etc.

Depth of cut?

Soil conditions?

B-soils (45 lbs per foot of pressure)

C-60 soils (60 lbs per foot of pressure)

C-80 soils (80 lbs per foot of pressure)

Determine Spreader Length

If working with pipe, what is the outside diameter of the pipe?

Pinnacle recommends that the manhole box to be at least 12” wider than the pipe.

Determine Trench Shield Length

If working with pipe, what is the length of the pipe sections?

Pinnacle recommends that the manhole box be 2’ – 4’ longer than the pipe.

Determine Maximum Weight of Manhole Box System

Determine the working operation weight of excavator being used at job site and divide it by 5. This number would provide you with the maximum weight you excavator can handle.

When selecting box size the weight should include the spreaders. 

Installation Instructions

Step 1 Lay wall A of Manhole box flat on the ground with the collars facing up as shown	Step 2 Place each spreader on the collar one at a time as shown and insert pin and place keeper, make sure pin keeper in facing towards the bottom of manhole as shown
Step 3 Take wall B place over the top of the spreaders a shown and pin into place with keeper towards the bottom	Step 4 Take your rigging place on top lifting eyes inside as shown and left to stand