Classifications
The classes of covers and tops suitable for use depend on the installation location. The various installation points are divided into groups with numbers from 1 to 6, as shown below. The picture shows the location of some of these groups within a street. For each group, the class of cover or top that should be used is indicated in brackets as a guideline. The choice of the appropriate class is left to the user / planner. In cases of doubt, choose the next higher class.
The cover can be designed for fire protection requirements, e.g. F 30, F 60, F 90 etc.
Depending on requirements, fire protection from top to bottom, from bottom to top or fire protection from bottom and top.
Verification is carried out in accordance with DIN 4102 or by means of expert opinions / official verifications from our suppliers' material testing institutes.
All covers and tops are also available as structurally reinforced prefabricated reinforced concrete parts.
All covers and tops can also be supplied as a statically strengthened prefabricated reinforced concrete part, e.g. as a reinforced concrete slab with one or more integrated covers or similar.
Gas-tight covers are impervious to gases under atmospheric pressure (unpressurised gases) from bottom to top and/or from top to bottom.
Gas tightness only refers to sewer and faecal gases. Other gases on request (due to the resistance / durability of the seal).
Hinged cover with hydraulic opening aid.
The hydraulic cylinder can be operated by means of a hand or foot pump or via an electric hydraulic unit (12 volt, 24 volt, 230 volt or 400 volt).
The covers are provided with ventilation openings in accordance with the specifications of DIN EN 124.
For covers with a clear width ≤ 600 mm, at least 5% of the area in relation to the clear area of the cover. Clear width > 600 mm at least 140 cm2 ventilation cross-section.
A closure that can be opened from below using only one handle. Positive locking and adjustable closure for e.g. emergency exits.
Non-positive closure, by screw in the cover with latch below the cover. The latch engages in or under the frame.
Screws with commercially available heads such as triangular, square VK 17, hexagon SK 19, hexagon socket are used.
Screws with special screw heads can also be supplied for special requirements.
Backflow-proof covers are impermeable to pressurised water (according to the pressure rating) from bottom to top.
In these designs, the non-positive and pressure-tight connection of the shaft and cover must be ensured by suitable structural measures.
The cover can be fitted with a hinge for easier handling.
Hinged cover with opening aid (e.g. gas spring rods or similar).
Additional protection against unauthorised opening of the cover.
Positive locking, via screw in the cover with spring and latch below the cover.
The bolt swivels and engages in or under the frame and must be tensioned via the screw. Advantage: No loose parts or open threads that can get dirty.
Screws with commercially available heads such as triangular, square VK 17, hexagon SK 19, hexagon socket are used.
Screws with special screw heads can also be supplied for special requirements.
Surface water that is not under pressure (i.e. hydrostatic pressure above the top of the cover = zero) is prevented from entering the shaft system by means of watertight covers.
Surface-watertightness refers to the cover and frame.
Surface watertightness refers to the cover and frame. Careful installation on site and testing after completion ensures watertightness between the cover and the shaft structure.
Flood-proof covers are impermeable to pressurised water (according to the pressure stage / overflow height) from top to bottom.
In these designs, the non-positive and pressure-tight connection of the shaft and cover must be ensured by suitable structural measures.
The frame of the cover must be secured to the shaft structure on site using dowels.
Proof of the anchoring and the selection of the anchors on the structure must be provided by the customer.
The cover fits into an existing shaft neck with a displacement guard.
This secures the frame against shearing forces that occur, e.g. due to vehicles braking and starting on the cover.
Basically, a distinction must be made between a positive-locking and a non-positive-locking closure.
Positive-locking closures are required, for example, for the following design variants: surface watertight covers, backflow-proof covers, flood-proof covers, gas-tight covers.
Non-positive closures are required, for example, to protect against unauthorised opening such as burglary, vandalism or to secure the cover in the frame.
Positive locking, by screw in the cover and thread / nut in the frame.
Screws with commercially available heads such as triangular, square VK 17, hexagon SK 19, hexagon socket are used.
Screws with special screw heads can also be supplied for special requirements.
The cover can be fitted with thermal insulation on the underside to reduce condensation.
Positive and adjustable closure of a cover operated from above by means of a rotary movement or from below by means of a handle / handwheel.
| A 15 | according to DIN EN 124 | can be walked on according to DIN 1055 |
| B 125 | according to DIN EN 124 | can be driven on by cars according to DIN 1055 |
| C 250 | according to DIN EN 124 | SLW 30 according to DIN 1072 |
| D 400 | according to DIN EN 124 | SLW 60 according to DIN 1072 |
| E 600 | according to DIN EN 124 | according to customer load specification
|
| F 900 | according to DIN EN 124 | according to customer load specification |
The purpose of this standard is to specify the definition, classes, materials, construction and testing principles, as well as the marking and quality control for mass produced attachments and covers mainly made of cast iron.
When using other materials such as e.g. steel, stainless steel, aluminium, composite constructions or reinforced concrete or when manufacturing individual covers / tops, the application of this standard does not make sense, as there are recognised calculation methods (static calculation) for these materials under an assumed load.
The expected loads for these covers are applied in the static calculation according to DIN 1055-3 ("Action on supporting structures"), DIN 1072 ("Load assumptions for road and path bridges") and DIN technical report 101 ("Action on bridges") and the cover is designed accordingly.