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					Jubail United Petrochemical Co mpany (United)                                                                   Site Safety Procedures Manual
United Olefins Co mp lex Pro ject                                                                                            Rev. 1, July, 2001
Jubail, Saudi Arab ia                                                                                                               Page 1 of 3


47.         CONCRETE OPERATIONS


            A.      GENERAL

                    This section provides guidelines to Contractors for the protection of personnel engaged in
                    concrete operation.


           B.       REQUIREMENTS
                    1)             No loads will be placed on a concrete structure or portion of a concrete structure unless,
                                   based on information received from a qualified person that the structure or portion of
                                   the structure is capable of supporting the loads.
                    2)             All protruding reinforcing steel onto and into which employees could fall shall be
                                   guarded to eliminate the hazard of impalement.
                    3)             No employee shall be permitted to ride concrete buckets, nor work under concrete
                                   buckets while buckets are being elevated or lowered into position. Employees will be
                                   required to wear proper clothing, boots, gloves, hard hat and safety glasses to prevent
                                   cement burns. Employees applying cement, sand and water mixtures through a
                                   pneumatic hose will wear face protection in addition to safety glasses.
                    4)             No employee shall be permitted to place or tie reinforcing steel more than six feet
                                   above any adjacent working surface unless the employee is protected by the use of a
                                   safety harness or equivalent fall protection.


           C.       EQUIPMENT AND TOOLS
                    1)             Storage bins, silos and containers must be equipped with conical or tapered bottoms,
                                   and have mechanical or pneumatic control to pour the material. Entry into the storage
                                   facilities shall be permitted in accordance with the lock and tag procedure in effect at
                                   that time.
                    2)             Power and rotating type concrete troweling machines that are manually guided shall be
                                   equipped with a control switch that will automatically shut off the power whenever the
                                   hands of the operator are removed from the equipment handles.
                    3)             Positive safety latches or similar safety devices shall be installed on all hydraulic or
                                   pneumatic gates of concrete buckets to prevent premature or accidental dumping.
                                   Buckets will be suspended from shackles or approved safety-type hooks.
                    4)             All pipe supports of concrete pumping system will be designed for 100 percent
                                   overload. Compressed air hoses will utilize only fail-safe joint connectors to prevent
                                   separation of sections when pressurized. Tremies, elephant trunks, etc., sections will be
                                   secured with fail-safe chain or wire rope in addition to regular couplings or connections.
                    5)             Concrete buggies (Georgia buggy) handles will not extend beyond the wheels on either
                                   side of the buggy. Where there is a possibility of contact with energized electrical
                                   conductors, handles on bull floats will be constructed of non-conductive material or
                                   insulated with non-conductive sheath.




D:\Docstoc\Working\pdf\51b7019c-a876-419d-bbfc-ab4e46c2334a.docGENERAL SIT E CONDITIONS AND SAFETY PROCEDURES
Jubail United Petrochemical Co mpany (United)                                                                   Site Safety Procedures Manual
United Olefins Co mp lex Pro ject                                                                                            Rev. 1, July, 2001
Jubail, Saudi Arab ia                                                                                                               Page 2 of 3


                    6)             Blades of masonry saws must be covered with a semicircular enclosure to retain blade
                                   fragments. A method for retaining blade fragments shall be incorporated in the design
                                   of the semicircular enclosure.
                    7)             Mixers with one cubic yard or larger loading skips shall be equipped with a mechanical
                                   device to clear the skip of materials. And guardrails installed on each side of the skip.


                    NOTE!!! All potentially hazardous energy sources must be locked out and tagged before
                            performing maintenance or repair on equipment.


           D.       FORMWORK/SHORING
                    1)             Formwork and shoring will be designed, erected, supported, braced and maintained so
                                   as to safely support any and all vertical and lateral loads that may be imposed upon it
                                   during placement of concrete. Drawings of plans showing the jack layout, formwork,
                                   shoring, working decks and scaffolding will be available at the job site.
                    2)             All shoring equipment will be inspected prior to erection to determine that it is specified
                                   in the shoring layout and that it is not defective. Defective or damaged shoring
                                   equipment must not be used for shoring under any circumstances. Erected shoring
                                   equipment will be inspected during and immediately before and after the placement of
                                   concrete. Damaged or weakened shoring equipment will be immediately reinforced or
                                   reshored.
                    3)             All sills for shoring will be sound, rigid and capable of safely carrying all vertical and
                                   lateral loads that may be imposed upon them at anytime. All base-plates, shore heads,
                                   extension devices and adjustment screws will be in firm contact with the footing sill and
                                   the form material. Eccentric loads on shore heads and similar members must be
                                   designed for such loading.
                    4)             Shoring for tiered single post shores and erected shoring must be designed and
                                   inspected by a qualified designer and by an engineer qualified in structural design.
                    5)             Single post shores must be vertically aligned, spliced to prevent misalignment, and
                                   adequately braced in two mutually perpendicular directions at the splice level. Each tier
                                   also must be diagonally braced in the same two directions. Single post shores should
                                   not be adjusted after the placement of concrete.
                    6)             The spacing between towers and cross-brace spacing in erected shoring will not exceed
                                   that shown on the layout, and all locking devices will be in the closed position.
                    7)             All shoring will be laterally supported by attachment to the structure. Freestanding
                                   masonry walls will be braced and supported to provide lateral stability against wind or
                                   other forces.
                    8)             Reshoring must be erected, as original forms and shores are removed, whenever the
                                   concrete is required to support loads in excess of its capacity.


                    9)             Forms and shores (except those used for slabs on grade and slip forms) must not be
                                   removed until the concrete gains sufficient strength to support its weight and
                                   superimposed loads. Compliance with the plans and specifications for removal of forms
                                   and shores, and proper testing with an appropriate ASTM standard test method can help
                                   determine if the concrete has gained sufficient strength.


D:\Docstoc\Working\pdf\51b7019c-a876-419d-bbfc-ab4e46c2334a.docGENERAL SIT E CONDITIONS AND SAFETY PROCEDURES
Jubail United Petrochemical Co mpany (United)                                                                   Site Safety Procedures Manual
United Olefins Co mp lex Pro ject                                                                                            Rev. 1, July, 2001
Jubail, Saudi Arab ia                                                                                                               Page 3 of 3




                    10)            Reshoring also must not be removed until the concrete being supported has gained
                                   adequate strength to support its weight and all loads upon it.
                    11)            Employees removing formwork or shoring at elevations in excess of 6 feet will wear
                                   and use safety harnesses with lanyards being attached to a lifeline or the structure.
                    12)            Steel rods or pipes of vertical slip forms on which jacks climb, or by which forms are
                                   lifted must be specifically designed and adequately braced when not encased in
                                   concrete. Forms must be designed to prevent excessive distortion of the structure during
                                   the jacking operation. All vertical slip forms must be provided with scaffolds or work
                                   platforms where employees are required to work or pass.
                    13)            Jacks and vertical supports must be positioned so that the loads do not exceed the rated
                                   capacity. Jacks or other lifting devices must be provided with mechanical dogs or other
                                   automatic holding devices to support the slip forms in case of power supply or lifting
                                   mechanism failure.
                    14)            The form structure must be maintained within all design tolerances during the jacking
                                   operation and must not exceed the safe rate of lift.
                    15)            A limited access area must be established and barricaded before precast concrete work
                                   begins. Only employees actively engaged in erecting the precast will be permitted to
                                   enter this area. Employees shall not be permitted under precast concrete members when
                                   they are being tilted or lifted.
                    16)            Precast wall units, structural framing and tilt-up wall panels must be adequately
                                   supported to prevent overturning and to prevent collapse until permanent connections
                                   are completed.
                    17)            Lifting hardware also must be capable of supporting at least five (5) times the
                                   maximum intended load.


           E.       MASONRY CONSTRUCTION
                    1)             A limited access zone must be established and barricaded whenever a masonry wall is
                                   being constructed. The limited access zone must be established prior to the start of
                                   construction of the wall; must be equal to the height of the wall to be constructed, plus
                                   1.2 meters (4 feet), must run the entire length of the wall, and must be established on
                                   the side of the wall which will be unscaffolded.
                    2)             Only employees actively engaged in constructing of the wall w ill be permitted to enter
                                   the barricades limited access zone.
                    3)             This barricade will remain in place until the wall is adequately supported.
                    4)             Mason wall of over 2.4 meters (8 feet) must be adequately braced to prevent
                                   overturning and to prevent collapse. The bracing must remain in place until permanent
                                   supports are in place.




D:\Docstoc\Working\pdf\51b7019c-a876-419d-bbfc-ab4e46c2334a.docGENERAL SIT E CONDITIONS AND SAFETY PROCEDURES

				
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