SUPERVISION ON CONSTRUCTION SITE Obligations of supervisor on site

Spearhead Network for Innovative, Clean and Safe Cement and Concrete Technologies

SUPERVISION ON

CONSTRUCTION SITE

Obligations of supervisor on site

Mr. Mario Ille, PhD candidate, IGH Azra Balagija, PhD candidate, IGH

CONTENT

• Introduction

• Contractor and supervisor engineer

obligations, rights and duties

• Application of valid regulations on

example of

Krk bridge

• Conclusion

INTRODUCTION

• The rights and duties relating to contractors and

supervisors in the process of construction through review of the most important Acts, Technical Regulations and Ordinance that were developed and legislate in recent years.

• Implementation of quality control of concrete on the site as one of the obligations of contractors in the

construction procedure, all in accordance with applicable regulations in the Republic of Croatia.

• Croatia is preparing to become a member of the European Union and it is necessary to adapt their

regulations to those that apply to the EU market, but it is also necessary to comply with applicable regulations.

CONSTRUCTION PARTICIPANTS

In accordance with Article 177. Physical Planning and Building Act

(NN 76/07, NN 38/09, NN 55/11, NN 90/11 & 50/12)

• Investor

• Designer

• Reviser

•

Contractor

•

Supervisor engineer

OBLIGATIONS OF CONTRACTOR

according to approved main design and building permit and thereat:

• Confer performance of construction works and other works to persons who fulfill ordinance requirements for performance of these works

• Perform works in order to fulfill basic requirements and other requirements for structure

• Embed construction products and equipment in

OBLIGATIONS OF CONTRACTOR

Provide:

• proof of usability of embedded construction products

• proof of compliance of embedded equipment according to specific act

• documents of compliance of specific building parts to basic requirements for structure and from competent authority given proof of quality (testing results, records of conducted control quality procedures etc.)

• Legally dispose construction waste generated during construction on the site

• Draw up a written report of conducted works, and of the maintenance building

SUPERVISIOR ENGINEER

• In accordance with Physical Planning and

Building Act

Supervisor Engineer

is a natural

person who under a special law has the right to

use the professional title of a licensed architect

or licensed engineer and to conduct technical

supervision of construction on behalf of the

Investor.

• The supervisor engineer can not be an

employee of a person who is the contractor on

the same building

OBLIGATIONS OF SUPERVISIOR

ENGINEER

• Supervise the construction to be in accordance with

confirmed the main design, or building permit, Physical Planning and Building Act and special regulations

• Determine if a main design in terms of horizontal and vertical dimensions and purpose of the building is made in accordance with the decision on building conditions or location permit

• Determine if construction staking is performed by the person authorized to conduct affairs of state survey and real property under a special law

• Determine whether the contractor meets the

requirements for performing construction activities, regulated by special law

OBLIGATIONS OF SUPERVISIOR

ENGINEER

•

Determine the implementation of control

procedures in respect of compliance

assessment, and prove the quality of certain

parts of the building by an authorized person

• Immediately inform Investor with all the

disadvantages or irregularities perceived during

construction, and Investor, building inspections

and other inspections of the measures taken

• Compile a

final report on the building

CONSTRUCTION

construction works which affect the fulfillment of basic requirements for the existing structure Performance of

construction works in order to preserve the basic requirements for the existing structure

REPAIR AND PROTECTION

• In the past few decades the need for renovation of existing structures (especially bridges) has increased. • With development of the area of repair and protection of

concrete structures the legal and technical regulations related to this area also had to pursue.

• The adoption of new rules for concrete structures

(Technical regulation for concrete structures) involved products and systems for the protection and repair of concrete structures for the first time.

• At the same time the Ordinance on conformity

assessment, documents of conformity and marking of construction products was adopted and therefore

brought the obligation to bring the approval of the

EXAMPLE OF “KRK BRIDGE” REPAIR

• It was built from 1976 until 1980

• Only six years after the opening for traffic it was

concluded that some badly done structural solutions must be repaired urgently and that concrete structure has to be protected from the chloride ingress

“KRK BRIDGE”

• The bridge connects the mainland with the

island of Krk over islet of St. Mark in the vicinity

of Kraljevica through two sea channels

• Its total length is 1309.50 m without abutment

(including the 96 m road cut on the island of St.

Mark)

“KRK BRIDGE”

• Two highest columns

(S8 & S17) are 61,44

m high

• Width of big arch is

13,00 m

BUILDING PARTICIPANTS SHEME

TECHNICAL SUPERVISION

INVESTOR

SUBCONTRACTOR _{CONSTRUCTION SITE}LABORATORY ON CONTRACTOR

BASIC DOCUMENTATION FOR QUALITY

MANAGMENT AT THE CONSTRUCTION SITE

Documentation that preceded the construction and execution:

• Building permits (with the main design as an integral part, the site permit)

• Detailed design, program control and quality assurance • Appointments of persons responsible under the Physical

Planning and Building Act

• Study on site organization with the work protection and safety and fire protection

• Record of the geodesic construction staking • Plan for quality performance

BASIC DOCUMENTATION FOR QUALITY

MANAGMENT AT THE CONSTRUCTION SITE

Documents and records generated during construction:

• Construction diary, Construction book

• Specifications of materials and construction products in the order

• Supplier Declaration of conformity, certificates of conformity of products, the certificate of factory production control, technical instructions for installation and use of products

• Records of the control activities carried out on site

• Evidence about the quality of the built-in concrete (reports of examinations conducted on the site)

• Proof of usability of concrete structure according to Technical regulations for concrete structures annex “J.2.4”

QUALITY CONTROL FOR COLUMS

REPAIR

PREPARATION WORKS FOR COLUMNS REPAIR

EMBEDING OF NEW STEEL

REINFORCEMENT

STEEL REINFORCEMENT IN ACCORDANCE TO HRN EN 10080 AND REGULATION FOR CONCRETE STRUCTURE ANNEX B MADE ACCORDING TO DESING

REINFORCEMENT EMBEDING ( FOLDING AND CONNECTION FITTINGS CONTROL )

CONSTRUCTION SITE ORGANISATION CONTRACTING SUPPLIER

CONTROL PROCEDURES BEFORE INSTALLATION

PROJECT DOCUMENTATION

GEODESIC STUDY

CASTING WITH NEW CONCRETE QUALITY MANAGMENT OF CONCRETE

CONTROL TESTING OF BUILT IN CONCRETE AND PROTECTION SYSTEM

CASTING WITH NEW CONCRETE AND PROTECTION LAYER

OVERVIEW CONCRETE SURFACE A FTER REMOVAL

DETERMINATION OF SURFACE PROPERTIES (CONTROL OF PREPARED SURFACE

STEEL REINFORCEMENT OVERVIEW

DEMOLITION OF CONCRETE COVER

HYDRO DEMOLITION OF CONCRETE

COVER ON COLUMNS AND ARCH

QUALITY CONTROL OF SURFACE

PREPARATION

The appearance of concrete surface after removal of the damaged and contaminated layer of concrete with hydro demolition

Place of testing the quality of surface preparation - Tensile strength of the surface layer of the pull-off method

APLICATION OF REPAIR PRODUCTS

ON COLUMNS

APLICATION OF REPAIR PRODUCTS

ON ARCH

CURING OF PLACED MATERIALS

The curing conditions of placed layers or elements of mortar / concrete and the procedures for quality control are given in

QUALITY MANAGMENT OF CONCRETE DURING

CONSTRUCTION

Program of quality performance Concrete casting records

Supervision before concreting Fresh concrete control and

supervision before casting

Supervision after casting Casting and compacting of

concrete

Supervision of precast concrete elements Regulate the management and

execution of concrete works and ensuring quality control

during the execution of concrete works (includes scaffolding,

reinforcement, casting, precast elements, geometric tolerance, supervision and repair)

QUALITY MANAGMENT OF CONCRETE DURING

CONSTRUCTION

Record of taking samples Uniformity of compressive strength test results

General data of construction site

Concrete data

Data about taking samples List of necessary hard

QUALITY MANAGMENT OF CONCRETE

DURING CONSTRUCTION

control testing

Sample taking record

Fresh concrete data Testing results of fresh

concrete in-situ

General data of construction site

Equivalent elements of concrete structure data

QUALITY MANAGMENT OF CONCRETE

DURING CONSTRUCTION

results assessment

Final report on conducted control procedures of concrete quality establishment

CONTROL TESTS BY TYPES OF WORK (reprofiling, grouting, the new concrete/mortar, surface protection systems)

CONCLUSION

• Croatia has established building regulations and is still evolving and adapting to market demands of the EU (Laws, Concrete Structures is used, Decrees,

Regulations, Standards)

• The obligation of all participants meet the requirements of statutory construction and current building regulations

• The design and construction going on at our mistakes are too much of contempt and misinterpretation of the

CONCLUSION

RULES THAT SHOULD BE ADOPTED

• Regulations to regulate the manner in tests

samples from the site in the laboratory

contractors or independent accredited

laboratory

• Complete work on national standards appendix

for the Performance of concrete structures HRN

EN 13670:2010 - in progress

THANK YOU FOR YOUR KIND

ATTENTION!

mario.ille@igh.hr