Table of Contents
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2. CONSTRUCTION WORKS
Ground surface requirements
A solid base (concrete) allowing secure fastening with screws; asphalt surface is not suitable as screws will not hold unless there’s concrete beneath the asphalt.
The level of the solid base should not be lower than the surrounding area to prevent water from pooling around the station.
Ensure that there is no soil or debris covering the solid base.
The surface should be as smooth and level as possible to ensure proper alignment of the station; otherwise, the station may appear crooked, or water and moisture may seep in.
Ideally, when preparing a new location, use anchors inserted into fresh concrete for significantly easier and faster installation.
Underground Anchor
The underground anchoring structure is built into concrete foundation and is made of stainless steel. The preparation of the foundation depends on the structure of the ground on the designated location. The underground anchoring structure can be combined with reinforcing steel.
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It supports the weight of the charging station.
It prevents tilting of the charging station.
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Figure 4: Assembled underground anchoring element
The dimensions of the underground anchoring element are:
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Screw nuts on each anchor rod. There are six rods in the anchor package. Be careful to observe the nut positions on the rod as pictured below:
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Figure 5: Anchor rod with initial screw positions
Place the rods into the anchor frame holes. Screw nuts on the other side at the top of the frame, where the rod enters through the frame. Tighten upper and lower nut firmly. Repeat for all 6 rods.
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Figure 6: Insertion of anchor rods into the upper frame (bottom view)
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Figure 7: Insertion of anchor rods into the upper frame (top view)
Place the L profile on the bottom of the anchor. Place all tree rods in one line into the L profile holes and screw nuts also on the bottom of the L profile, where the rod enters through the L profile. Tighten upper and lower nut firmly. Repeat for the second L profile and other three rods.
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Figure 8: Insertion of anchor rods into the bottom L profile
During final mounting, the charging station is attached to the six protruding bolts of the underground anchoring element. The screws on each of the six bolts need to be removed first and are later used to fix the casing of the charging station to the foundation once it has been placed in the correct final position.
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The first step of the construction work is to prepare an excavation with the minimum basic dimensions of 550 mm x 420 cm and at least 600 mm in depth. If the charging station is combined with safety arches, a larger excavation is needed. If necessary, the dimensions of the foundation can be enlarged by adding reinforcing steel to the concrete foundation to enable construction of a larger foundation.
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Figure 9: Basic excavation – longitudinal section
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Figure 10: Basic excavation – transversal section
The two figures above show a longitudinal and transversal section of the basic excavation, together with the dimensions of the underground anchoring element which is concreted into the foundation. The basic excavation is suitable for installation of charging station without safety arches. One of the requirements of basic installation is to carefully observe that the height of the upper edge of foundation is precisely aligned with the height of surface finish in the area around the charging station.
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The station can be protected by one or two safety arches that can be placed at both sides of the station (2 arches) or only at the front (1 arch).
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Figure 11: Longitudinal section of the excavation with two safety arches
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Figure 12: Longitudinal section of the excavation with one safety arch
The figures above show a longitudinal section of the excavation in all cases where the charging station is combined with safety arches. The arches must be removed at least 15 cm from the sides of the charging station to enable normal opening of station's maintenance doors.
The height of the concrete base must reach such a level that the height of the safety arches will be exactly 70 cm above the surface finish. Safety arches need to be precisely levelled during the concrete works to prevent any later tilting.
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Figure 13: Transversal section of the excavation and safety arches on the curb with two safety arches
The figures show a transversal section of the excavation when the charging station is placed on the pavement and combined with safety arches. The safety arches need to be placed as close to the roadside curb as possible. The underground anchoring element is moved back accordingly, so that the rear side of the charging station (anchoring element) is aligned with the front side of the rear arches of the safety arches.
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Figure 14: Transversal section of the excavation and safety arches on the curb with one safety arch