General Installation Instructions for Manhole Covers
Which general points must be observed before, during and after the installation of manhole covers? You will find suitable answers in the installation instructions listed below.
Instructions before the Installation
Check all parts for perfect condition. Damaged parts must not be installed!
Use suitable lifting gear for loading and offloading, and for transporting parts on site.
Use appropriate tools for lifting out and/or inserting covers to avoid damage
Clean the contact surfaces and - if present - check the seal for cleanliness and correct fit and the closing device for perfect condition and operability before inserting the covers. Clean and moisten the underside of the frame before installation.
Instructions during Installation
The frame must always be in full contact with the mortar bed and capable of bearing. If the substructure is not executed correctly, subsequent traffic load will cause loosening, premature wear, rattling, or even destruction of the cover.
Prepare the mortar bed (min. MG III, DIN 1053), install the frame with full contact and align at the correct height. When installing thin-walled frames which are not torsion-free make sure the cover is fitted when installing the frame.
If necessary, install anchor bolts in the shaft (e.g. pressure tight covers).
When adjusting the height of the manhole cover > 20 mm, concrete support rings, levelling segments or plastic-modified, non-shrinking, fast-hardening grouting mortars are recommended. For subsequent height adjustments, a new, full-surface mortar bed must always be produced.
Insert dirt catchers.
Clean the top of the frame before inserting the cover and clean the contact surface of the cover.
Insert the cover and check for noise-free seating.
Secure the Cover
The screws for screwed covers are tightened as follows:
M16 with max. 100 Nm
M18/M20 with max. 120 Nm
Instructions after Installation (Operation/Maintenance)
Lift out and insert the cover only with a suitable opening bar/key.
Ventilation opening time
Wait for ventilation opening time after opening if necessary (approx. 15 min.). Danger from gases!
Replace seal if damaged.
The supporting surfaces must be cleaned before each closing.
Installation instructions for self-levelling manhole covers
Operating and maintenance instructions can be found in our download area
Information about our manhole covers