REHABILITATION expansion joints (I)

Expansion joints

Before addressing the rehabilitation procedures of expansion joints should remember that they are the expansion joints and their function within the building structure. Here, we could define the expansion joints as connecting element between two adjacent parts of a building, structure or concrete structure whose function is to allow certain relative movement between them without causing damage or breakage without causing damage to any part or structure. Multiple factors that can cause these movements in the structure of a building: contractions, expansions or warping of materials used in the construction of buildings usually caused by variations in ambient temperature or the presence of moisture are the most common.


When the internal resistance of a construction material is less than the voltage at which it is subjected by contraction movements, expansion or warpage, there is a serious risk of cracking of the material and for them to be use joints expansion as the control element stresses occurring inside the building structures.
The current Technical Building Code a number of mandatory conditions in the construction and rehabilitation of the expansion joints in buildings are set:

The walls must have expansion joints to absorb deformations due to temperature and, where appropriate, the retraction. These expansion joints must be present in every section changes when there are singularities own wall such as stairs, ramps, etc. and when they have to differentiate between adjacent sections of the wall.

Expansion joints shall be not one another, unless justified, more than 30 m, recommending a separation between expansion joints not exceeding 3 times the height of the wall and an opening of the expansion joint between 2 and 4 cm.

When significant effects retraction must provide false interlayer expansion joints whose separation shall be between 8 and 12 m, weakening the wall section to predetermine the fracture plane.

Expansion joints and products for filling them must comply with the specifications in the core document DB-HS section 1 so as to ensure their full impermeability.

Avoid frames pass through expansion joints, allowing in special circumstances such as when necessary to maintain alignment, in which case expansion joints should be designed as pins lubricated without kinks or anchors to allow longitudinal movement and adequately protected in accordance with the specified durability.

There are different types of expansion joints: Expansion joint discontinuity design, construction expansion joint, expansion joint expansion joint contraction and expansion discussed in successive post and the rehabilitation of the expansion joints and proper sealing thereof.

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