Hollow bricks and concrete floor consolidation


Hollow bricks and concrete floors built in Italy starting from the beginning of the twentieth century are often unsuited to current construction requirements: they are generally deficient in terms of the raw materials used (reduced use of concrete, insufficiently resistant concrete, or insufficient steel reinforcements) and no longer conform to modern standards.

The reduced load-bearing capacity and the absence of a reinforced slab for the distribution of the loads, nowadays necessary in seismic areas, make reinforcement interventions necessary.

The laying of a new concrete slab, connected to the extrados of the existing floor, is often the most economical and effective solution.

The success of the intervention depends on the capability of the connection between the existing floor and the connected slab to transfer the shearing actions and therefore obtain a fully interactive composite unit.

Examples of old hollow bricks and concrete floors

Tecnaria connectors for hollow bricks and concrete floors have been designed for this specific application. They have been tested at the University of Venice. They are installed following the instructions supplied by the appropriate software, available for download in the Download area.

Solai in laterocemento - Tecnari
A. Reinforced concrete and standard hollow brick floor:

  1. Floor finish
  2. Screed
  3. Concrete casting
  4. Hollow bricks

B. Miozzo Salerni floor:

  1. Floor finish
  2. Insulating sheets
  3. Screed
  4. Concrete casting
  5. Hollow bricks

C. Adamoli floor:

  1. Floor finish
  2. Screed
  3. Concrete casting
  4. Honeycomb hollow bricks
Before undertaking the intervention, it will be necessary to assess the condition of the structure and the residual mechanical properties of the beams. It is important to carry out a geometric assessment, identify the strength of the concrete and, most important, quantify and ascertain the quality of the existing joist.

To ensure appropriate connection between the concrete layers, Tecnaria offers three types of products, depending on the application context. It is important that the connection is completed using the specific components purposely designed for the specific application.

 

Sometimes hollow bricks and concrete floors cannot be consolidated using the proposed systems. Below is the description of an intervention with the insertion of steel beams in the existing floor

When it is not possible to ascertain the increase in resistance due to the roughness of the two surfaces to beconnected, the connector plays an even more important role. A slipping movement between the structural element components  reduces the overall load bearing capacity and increases the deformation.

Studies have been carried out, on the structural behaviour of the CTF stud connector and the DIAPASON connector for composite steel-concrete beams joined to the metal structure by nailing. The studies are based on experimental tests carried out on several push-out type samples, including both a solid slab cast directly on the beam and a […]

Tecnaria wood connectors have specific features that makes them unique: the efficiency of the connector is ensured by the solid base plate, which supports the stud and features crampons that ensure a high level of adhesion to the wood, and the best shear stress absorption. The many lab tests have highlighted the validity of this […]

Tecnaria CTF connector stud fixed through continuous sheeting: application example Possibility of nailing through 1 sheet (1 x 15/10) or 2 sheets (2 x 10/10). Suitable for all types of steel and all profiles with a thickness greater than 6 mm. Minimum profile IPE 120 or HEA 100. Tecnaria connectors are particularly advantageous for applications […]

To ensure an efficient construction and consolidation of wood and concrete floors, TECNARIA was the first company in Europe to submit its BASE and MAXI connectors to an accurate experimental investigation and undergo stringent tests in compliance with Eurocode 5 regulations. The deformability and strength characteristics of connectors fastened to timber have been experimentally verified […]

EXISTING Typical shortcomings of existing masonry buildings: wall-wall / wall-floor ties Floors are one of the most vulnerable parts of buildings constructed without any seismic criteria. The beams that form the floor are often simply resting on the supporting walls, held in place by a simple frictional force. In the event of violent seismic action […]

Fibre reinforced concrete. Thanks to the most recent construction techniques, it is now possible to build extremely resistant floor slabs with small thicknesses. This is the case with fibre reinforced concrete, which is becoming more and more popular in hollow bricks and concrete floors. Tecnaria has developed specific connectors.

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