Introduction

Due to the time limitation and faster productivity, we intended to devise a new method in construction industry. The structural system is included reinforced concrete walls and reinforced concrete slabs. In longitudinal direction these walls can resist against longitudinal earthquake forces, also in transverse direction they act like a bending frame and resist against lateral earthquake forces. Concrete prefabricated industry is as old as 100-110 years in the world. It is entered into the industry after the first concrete T-shape beams have been produced. The main structure of the building is consisted of:

 

  1. Load-bearing concrete walls:

    These units act as load-bearing walls against earthquake forces.

     
  2. Slab-beam:

    Two kinds of slab-beam with 20 and 60 cm width were used for ceiling coating. The 60 cm beams transfer the loads of the ceiling to the loading walls and also at the 2 ends transfer the earthquake forces to the walls. The 20 cm beams arranged between the 60 cm beams.

     
  3. Circled-roof:

    This roof designed with the 3D lattice. In this method the weight of the roof decreased notably.

  4. Tie-beam connector of the walls:

    These tie-beams connect the bases of 2 walls which are in front of each other.

  5. Staircase connecting:

    In this structure staircase is made of iron-framing and be roofed with concrete slab.

The installation of the concrete prefabricated units was done in several phases:

  1. Concrete flooring
  2. Placement of the walls
  3. Installation of the tie-beam
  4. Installation of the beams
  5. Execution of the circles-roof
  1. رکلاژ و اجرای بتن کفسازی Concrete flooring:

    At first the site should be excavated and concrete flooring done with 15 cm thickness.

  2. Placement of the walls:

    After determining the location of bases, base parts were located opposite each other.

     
  3. نصب شناژها Installation of the tie beam:

    After the regulation of the walls, tie beams were installed with welded connections.

     
  4. نصب تیرها Installation of the beams:

    After the installation of the walls and tie-beam, 60 cm beams were assembled.

     
  5. اجرای سقف قوسی Execution of the circles-roof:

    When all the wall parts and beams were installed, circled-roof were assembled with 3D lattice &Polystyrene layer. For waterproofing of the roof, it is pained by special color with  Polyurethane base.

     

Special Technical characteristic:

  1. Installation moisture-proof insulation on the façade:

    After wall been dried, a transparent silicon color coats the walls. This cover penetrates in to the concrete and make a waterproof layer.

  2. Water-proofing the ceiling with special colors:

    When the fabric were finished and circled-roof were installed, poly urethane layer used for insulating the roof. Both 2 methods; spraying and rolling can be used.

  3. Installing gasket between the parts:

    After all the parts have been installed, a silicon gasket were used for filling the gaps between the concrete parts, which is resistant against weathering and ultraviolet ray.

  4. Sound and heat insulation of the walls:

    If the project were done in tropical or cold areas, one wool layer with 4 cm thickness and one knauf chalk layer were used.

  5. Another way of insulation of the walls, is granular grains. In this method wall’s concreting were done in 3 layers. The first and third layers are structural and second one is light concrete. This method is suitable for sound and heat insulation