Method Statement for Structural Steel Erection.

1.0  OBJECTIVE

      To ensure the management, erection and installation work on site are safe, correctly, and comply the contract specification.

2.0  PURPOSE

      The purpose of this method of statement is to establish a work sequence on how to erection and installation of steel works will be implemented. The statement includes work methodology and sequence of activities all in accordance with the contract specification for structural steelwork.

3.0               SCOPE

      The following works, define the activities which will be carried out for implementation the erection and installation of steelwork for (YOUR TITLE)  according to the contract specification:-

                                            i)            Transportation of Fabricated Portal Frame

                                          ii)            Unloading, Arrangement, Storage and Protect Materials

                                        iii)            Installation of Steel Columns

                                        iv)            Erection of Portal Frames 

4.0  WORK EXECUTION PROCESS

4.1  Job Site Planning & Preparation

ü  Make sure there is space and firmed pathway for truck delivery, crane truck erection operation. The suitable truck & crane capacity must be clarified.

ü  The plan for unloading and materials storage on the site should be suitable and dry location. Materials shall be stored in designated areas for each building and clearly identified for their location as per planning.

4.2  Receiving Of material at Site

ü  All delivery materials to the site shall be informed to the site manager to have the plan for unloading. Upon arrival of materials at the storage yard, the materials controller will match delivery notes and shall verify the consignment.

ü  Unloading can be done manually by term with using 25-tonnes cranes. A spreader should be used for long steel components. Lifting nylon or cloth belts with suitable SWL shall be used for unloading the materials to minimize the damage. Be sure to hook belts to component with the right number of points and position so that the load of the component itself do not damaged or broken especially the coating/discolour.

ü  All materials receipt at the site shall be visually inspected by site supervisor/engineer for any damage after unloading. Any damage shall be taken immediately, if possible, to avoid any delay of erection. 

4.3  Sequence of Erection

The structural portal frames and other parts that related of the building structural can be erected in various ways which will depend on the following key factor:

ü  The types of structures such as small clear span, large clear span, low rise building, high building, taper I structure and open-web structure, etc.

ü  The availability of equipment

ü  The site condition

ü  The experience level of the erectors

ü  The individual job conditions.

5.0  METHODOLOGY

The erection and installation of steel that according to the contract specification clause (Your Contact Specification)

5.1  Transportation of Fabricated Portal Frame

      The fabricated I-beam columns, rafter and truss by the measure in range 6m until 10m length weight approximately 1.5 metric tons are transported to the site by mean of the trailer. The steel materials (fabricated portal frame) should be properly arranged on the trailer by separately.

5.2  Unloading, Arrangement, Storage and Protect Material.

5.21        Unloading

The fabricated portal frame unloaded by using 25-tonnes crane. Before unloading materials out of trucks, the platform or access road must be prepared properly for crane and trucks by term safely load.

5.2.2        Arrangement

To avoid materials being moved so much on the job site that might cause unexpected damages of paint or discolour and shapes, they shall be unloaded and arranged close to the designed erection point. The materials shall be stacked in location according to the building/areas, should be near to the lifting position adjacent to the area to be erected. 

Conditions of each job site, the materials arrangement plan may different based on open clear area. The fabricated I-beam or columns should be arranged close to their anchor bolt position. Rafter should be arranged to ensure easy to assemble and move. All condition arrangement should be checked park-mark as parking list enclosed before unloading for the best unloading position. 

5.2.3        Storage and Protect Material

To preventing and protecting materials from damages during storage that exposed to environment factors such as storm water, dust, etc which can cause the rust, stain, discolour, and etc, the proper storage should be provided to avoid the steel materials damages, deformation and contamination. The tasks below should be considered:-

-          Dry area and stored above ground level with timber packing and ventilated.

-          Steel component or materials shall be stored separately for difference sizes and types.

-          The materials should be placed in minimum 5% slope to avoid water pond.

-          The materials shall be kept free from the dirt, dust, grease and other foreign materials. 

5.3  Installation of Steel Column

Repeat procedure of erection columns and portal frames to complete frame.

5.3.1        Preparation

After the columns are being distributed along the designated positions, the materials need to be cleaned and assembled before erection. Level and position of nuts and anchor, lifting weight and crane position shall be checked. 

5.3.2       Erection

The 25-tonnes crane is set-up with the suitable position to lift the column into position. Before major lifting, all the slings 1 rope is inspected by riggers. The lifting 1 swing area will be barricaded to prevent unauthorized works/personnel into the area. Slightly down column on cast anchor bolts. The nuts will be tightened upon installation of column base plate into anchor bolts in right position.

5.4  Erection of Portal Frame

The weight of portal frames is approximate 10 tones.

5.4.1        Preparation

The scaffolding should be prepared for workers to perform rafter to rafter, rafter to column connection including item 5.3.1. Temporary anchor points should be arranged out of working area to avoid hanging materials can be caught by temporary cable. 

5.4.2        Erection

 TEP 1

The fabricated sections are joined together J1, J2 & J3 at the site along the grid lines.

STEP 2

The connected frame will be slightly lifted by two cranes (25-tonnes) into position and bolts tightened. Two units of mobile scaffold platform to the joint height will be pushed to place to do the nuts tightened.

Workers on the ground will drive the fabricated steel (rafter) to the right position in coordination with the crane. Crane is only released when all connection bolts and nut adequate tighten.

5.5  Erection Sequence

5.5.1        Braced Bay Erection

Brace bay will be erected in priority. After completion bracing bay frames, all components such as brace rod, flange brace, etc of this shall be completed as per shop drawing. Braced bay frames must be temporarily aligned before installation purlins and bracing to avoid difficulties may get if conducting alignment for remained frame.

5.5.2        Remaining Frames Erection

Proceed with the erection of the remaining frames and additional bays. Eave struts and peak purlins may be installed in the immediately bay between braced bays to stabilize frames. 

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