SPACE FRAME SYSTEMS

Pipes:
The pipes, the main carriers of the system which are exposed to axial pressure or the drag force, are produced in accordance with DIN 17100 using the steel pipes with circular cross-section that have a low carbon content and a high ability to be welded with the quality of St 37, St 42 or St 52. The material used for the apparatus welded to both ends of the pipes by means of the gas welding method has the same quality as the pipe material.

Spheres:
Produced using Asilçelik 1040 material as per DIN 17200, the spheres are sized between the diameters of 50 mm or 250 mm based on the project design. They are shaped and ground using the hot forging technique, and the rough layer on them is removed. Based on the requirements of the production project, the processes of threading, surface smoothing are performed on the CNC workbenches. In case there is no requirement to the contrary, it is coated with 25 micron thick electro galvanization.

Nuts:
Nut types are determined according to the calculated pressure and drag force. Nuts are mounted through the splits opened on both sides and by means of the pin passing through the bolts.
Horizontal Beams:
Having a rectangular cross-section in general, the horizontal beams have St 34 or St 37 quality. These are produced in the factory, based on the type of the coating to be used and the condition of the space frame system. Unless there is a demand to the contrary, it is painted with one coat of anti-rust and one coat of final paint, following the completion of the material cleaning. It is mounted in the work site, using the bolts.

Horizontal Beam Posts:
Horizontal Beam Posts are used to establish the connections of the horizontal beams. In case the system itself does not form the roof inclination at the same time, this inclination is formed by the horizontal beam post lengths.

Bolts:
Produced in accordance with DIN 13, ISO threaded bolts bear the 8.8 or 10.9 quality, and they are supplied from the companies who are in the leading position in this field in Turkey. They are produced with dense threads, in order to prevent them from being influenced by the vibration. The bolts are appropriate components with threads being opened on the kneading machines. Click to obtain information about the technical properties of the bolts used.

PROTECTION AGAINST CORROSION

Protection Against Corrosion:
Unless otherwise is demanded, bolts and spheres are plated by electro galvanization and the nuts are plated by hot dipping or electro galvanization.
For the pipes, the following methods are used as desired:

a) Epoxy polyester powder paint on zinc phosphate,
b) Polyester powder paint on zinc phosphate,
c) Epoxy polyester powder paint on hot dipped galvanization,
d) Polyester powder paint on hot dipped galvanization.

Horizontal beams and their elements are painted in the desired colors, first by one coat of anti-rust which is air-proof and synthetic based and then a coat of final paint.

DESIGN

Architectural Design:
The space system planned in harmony with the architectural project is designed according to the steel roofs, aesthetics, purpose of use and economical parameters. It is becoming a preferred system in architecture owing to its being lighter than other roof systems and its being prefabricated, its ability to cross very wide gaps and its possibility to be painted in desired colors of powder paint. As the space system is fairly resistant against the horizontal loads according to its structure, it is especially preferred in the countries like Turkey which are located on the seismic zone.

Static Calculation Management:
All the static calculations of the highly hiperstatic space frame system are performed by computer aided operations. The calculation programs used are based on the matrix-displacement method. The calculation outputs include the node displacements, bar strengths, support reactions and all the element cross-sections. All the loads are applied on the nodes and transferred to the pipes with the help of the spheres. Thus, the pipes are exposed to only axial drag pressure loads. The loads are in accordance with TS 498.

ASSEMBLY

Assembly:
Before starting the assembly, the assembly leader checks the place where the space system will be installed, column axles, ancher plates and existing work site conditions; and takes these from the executive staff of the work site. In case there are conditions which constitute an obstacle for the assembly, he informs these to the work site executive by a report and requests these conditions to be corrected. After the suitable conditions are provided, assembly is started in accordance with the project. All the elements of the space frame system are mounted in place in a free axial position by tightening their bolts all the way to the end without forcing. The assembly is completed in such a way that there will be no loose bolt and all the elements will be located on the exact axis by applying the temporary support for the system as per the instructions of the work site leader, providing the necessary reverse sinking to the system and ensuring the general building safety. The bolt installation and galvanizing holes, if any, are left in a position not exposed to rain. The welding processes are avoided in the building to the maximum extent possible. The welds that have to be performed despite these are delivered after providing their protection against corrosion.

The most frequently used assembly methods:

1) Installing the system on the ground and then erecting it by means of vertical carriers.
2) Installation of the system in place, in the form of the groups of one or three.
3) Combination of the first two methods above.
4) Installation of the system on the assembly level, sliding it on the rails to fix at the final position.

TRANSPORTATION

Transportation:
Space system elements are transported to the assembly site inside special packing in a way to prevent breaks, scratches and damages. In this way, a safe transportation is ensured, which does not necessitate a wide stock area during the assembly, facilitates loading and unloading, and is not affected by the weather conditions.