Temperature-contraction joints in construction

For reinforced concrete structures, one-story, industrial and agricultural buildings allowed calculation without increasing the distance between the temperature-shrinkable seams 10% over standard values. For prestressed structures 1st and 2nd categories treshchinostojkosti joint spacing calculation must always be installed on the formation of cracks. Sedimentary seams must cut the whole structure to the foundation sole. These seams shall ensure the independence of both vertical and horizontal deformation of the parts of the structure, Only in this case the installation of the heating elements, such as floor heating in the apartment, will be a reliable and safe. Each sedimentary seam is both temperature and shrinkage. Sedimentary seams necessary to arrange at a possible nonuniform precipitate constructions, t. E. in the following cases:

  • - varying the bearing capacity of soil under the foundations of the various sections of the projected building;
  • - with significant differences in the loads on different parts of the foundation base of the building being erected;
  • - when the extension to the previously erected buildings; in buildings of large dimensions and complex configuration plan.

The monolithic and precast concrete frame buildings of temperature and contraction joints are usually performed on paired columns, standing on a common foundation, and a pair of beams on them. Such a seam is very convenient if the overlap or are heavy dynamic loads. Typically, the width-temperature shrinkage seam is taken equal to 10-30 mm.

The seam is filled with several layers of roofing felt or tar paper or tarred hemp. The precast concrete one-story industrial buildings for the convenience of the cross contraction joints give paired columns or roof structure rests on the supporting rollers, parts; most temperature-longitudinal contraction joints is performed on the coupled columns. Axis pair of columns shifted with weld axis by 500 mm.

Sedimentary seams are met: on the twin towers, based on independent foundations; as an insert, a simply supported on the two columns. Expansion joints in thin-walled spatial coatings usually carried out on the coupled columns which correspond to the paired aperture or side elements.

The undulating vaults for waterproofing expansion joints arrange on the crest of the waves, and in such a way that they coincide with the expansion joints of the walls. Deformations of shells of revolution provided by the use of their supporting flexible racks or by a device such supports that would not hinder the displacement of the support contour in the radial direction.

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