Patryk Krzyzaniak

CLT Product Development idea, Parabolic tennis wall

Our task was to invent some product development where we could use a CLT material. My idea was to build a Parabolic Tennis Wall. The original idea is coming from Poland. The difference with the Polish product are the materials used in that wall. It is combination of concrete and steel. In my project I have replaced concrete with CLT. For the wall itself I will use CLT and for the base I will use steel.

  1. Objective of the Parabolic Tennis Wall:
  • The shape of the Wall has been designed in manner to ensure return of the bounced ball identical with return of real sparring partner on the tennis court.
  • Assembly of the Wall is manual, simple an easy, and does not require any heavy equipment.
  • Construction works and documentation are reduced to the necessary minimum.
  • The Wall is made of durable, and „environmental friendly” materials.
  • The Wall can easily be dismounted and relocated .
  1. Construction of the wall:
  • The Wall is built with prefabricated CLT slabs with 20 mm thickness and 1 m x 1 m dimensions
  • The bottom slabs stand at ground level.
  •  The top and middle slabs are identical.
  • The slabs are joined with M 10 zinc coated bolts.
  • Vertical stability of the wall is ensured by supports attached to the wall under 45 degree and anchored into the ground.
  •  Upper end of supports are extender 1 m above the wall and they are used for installation of a ball catcher net.
  • The ball catching net is made with polypropylene net and is stretched between 3 mm steel ropes.
  • The supports are zinc coated and powder painted with green
  • The standard Wall is painted green from the front and with „sand desert” color from behind or any other according the Customer’s requirements
  1. Plan and documentation:

The Standard Documentation has to be reviewed and modified, if necessary by a local structural Engineer. The Engineer has to consider soil and environmental conditions (i.e. wind zone) and all applicable Safety Regulations required by the local Law. Such completed documentation does not require any other certificates. According to the Polish law, such free standing construction does not require the “Construction Permit” from a local authority. It is sufficient to submit the “ Application for Construction Works “.

  1. Assembly:

Depend on documentation, the montage can be completed in 2-3 days with 3 workers equipped with basic standard tools. Bottom slabs are stand at perfectly leveled the mounting level:

  • if the court surface is of a “hard type” the Wall can be placed directly on the surface
  • if the ground is stable, a 10 cm layer of light reinforced concrete mounting level is sufficient.
  •  final decision has to be always included in adaptive documentations.

Each of the two attached slabs have to be drilled together and screwed by two bolts. Middle slabs are stand on top of bottom plates with wider end to down. After alignment , the slabs are drilled and screwed to side and bottom plates. Upper slabs are stand at middle slabs with wider side to up side. Alignment, drilling and screwing is the same as with others slabs. Perfect alignment is ensured by groves on both side of slabs. Supports are attached to the upper slabs by two bolts. If it is necessary additional supports can be added in the middle of the Wall. The supports are anchored into the ground according to Drawings. At upper top of the supports, above the wall, the ball catching net are stretched at steel ropes. Final operation is double painting the wall from front and behind.

  1. Maintenance:

The wall does not require any specific maintenance. If necessary, the Wall can be washed with water or repaint.

  1. Relocation:

If it is necessary the wall can be very easily dismounted and assembly in another place. In this cause the slabs should be properly marked to assure proper reassembly of the Wall at the new location.

  1. Packing:

At one 1000 x 1200 mm palette can be packed 4 heavier slabs or 8 lighter slabs.

  1. More information like pictures and visual experience for the wall can be found at the official Polish website in here:

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