Ανοχές για αποδοχή μιάς κατασκευής

[Παναγιώτης]

@ Barracuda

 

Ο ΕΚΟΣ είναι για σκυρόδεμα. Στο χάλυβα ισχύουν τα ίδια όρια?

 

Από DIN δεν υπάρχουν τίποτα όρια? Κανείς παλιότερος?

[paktomenos]

Οποιος έχει πρόσβαση σε Din ή BS ή ΕΝ ας βρεί το:

Execution of steel structures and aluminium structures - Part 2: Technical requirements for steel structures; EN 1090-2:2008. Οπως βλέπετε υπάρχει ολόκληρο πρότυπο για αυτά τα θέματα.

Αντιγράφω από http://www.steelconstruction.org:

 

A new European standard for the fabrication of constructional steelwork is currently being prepared by CEN committee, TC135. This standard is called BS EN 1090-2: Execution of steel structures and aluminium structures – Part 2: Technical requirements for the execution of steel structures and when published will immediately replaced our current standards BS 5950 Part 2 (buildings), BS 5400 Part 6 (bridges) and BS 8100 (towers and masts). The anticipated date for publication is between May and October 2008. Companies will therefore need to familiarise themselves with this new standard.

 

This new standard introduces a number of issues that are different to the current British Standards for fabrication, some of these are briefly outlined below:

 

Constructor Responsibility

More responsibility is placed on the Steelwork Contractor to get it right first time, and more reliance is placed on the knowledge and competence of staff.

 

CE Marking

BS EN 1090 Part 2 will be a supporting standard for CE Marking. While the CE Marking standard, BS EN 1090 Part 1, contains general recommendations for setting up a Factory Production Control system much of the detail is contained in BS EN 1090 Part 2.

 

Execution Class

This standard introduces the concept of Execution Class. In simple terms Execution Class determines the level of workmanship used to fabricate the structure. Four Execution Classes are introduced from Execution Class 4 which is the highest quality to Execution Class 1 which is the lowest. The Execution Class can apply to the whole structure but it can also apply to individual details. For example a building structure could be classified as Execution Class 2 but a particular detail (e.g., a detail subject to fatigue) could be classified as Execution Class 3. In simple terms the Execution Classes can be viewed as follows:

 

· Execution Class 1 – Farm buildings

· Execution Class 2 – Buildings (similar to the scope of the NSSS)

· Execution Class 3 – Tall buildings, grandstands and footbridges

· Execution Class 4 – Road and rail bridges, power stations

 

The choice of Execution Class is a client decision. However, for CE Marking the Notified Body will certify the Factory Production Control (FPC) system according to the Steelwork Contractor’s chosen Execution Class. Each Steelwork Contractor, therefore, needs to define its Execution Class carefully. If it decides to go for Execution Class 2 (Buildings) it would not generally be able to fabricate and CE mark structures or parts of a structure that are classified as Execution Class 3 or higher.

 

Welding Quality Management System

As part of the increase in responsibility the standard requires Steelwork Contractors to have in place a Welding Quality Management System that conforms to the requirements of the relevant part of BS EN 3834. (See AMM 172-07)

 

Traceability

The level of traceability of the steel components (steel sections, plates, bolt) is linked to the Execution Class. For Execution Classes 1 and 2 batch traceability is required (as NSSS) while for Execution Classes 3 and 4, full traceability is required.

 

Tolerances

BS EN 1090-2 will contain two types of tolerances – essential and functional. Both tolerances are mandatory but essential tolerances are those that are declared as part of the CE Marking. Essential tolerances are those linked directly to the stability of structural components. The specifier is offered the choice of two classes for functional tolerances; class 1 is the default choice and is broadly similar to those in the NSSS whereas class 2 is more onerous. The rationale is that both are achievable but class 2 requires additional controls and expense. This should also ensure that a specifier seeking a closer fit does not seek to go beyond the values offered in class 2.

[ΑΡΗΣ ΧΑΝΙΑ]

Σχεδιασμός δομικών έργων από χάλυβα (της τριλογίας)

Σελ 643-657

 

Για κατεργασία και ανέγερση EN 1090

Xε.. Με.. δηλαδή

Άντε να το βρούμε με τον ΕΛΟΤ

[paktomenos]

δεν τα έγραψα εγώ. Αντιγραφή έκανα για μια πρώτη εικόνα του τι περιλαμβανει το πρότυπο.

[panos]

Μετα την εφαρμογή των ευρωκωδίκων έτσι θα μας ξεψαχνίζουν οι νομομηχανικοί των ξένων μεγαλοεταιριών όταν τολμήσουμε να τους πάρουμε καμιά δουλίτσα...

[Παναγιώτης]

κατεβάστε αυτό : http://www.michanikos.gr/dload.php?action=file&file_id=409

 

και κοιτάξτε το 1990-2 σελ 28-31