Installation of Steel Structure Foundations





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    PAGE NO 2 OF 21   TCSP12205R0/MAA TRANSMISSION CONSTRUCTION STANDARD TCS-P-12205, Rev 0   Date of Approval: December 16, 2006 TABLE OF CONTENTS 10 SCOPE 20 GENERAL REQUIREMENTS FOR FOUNDATIONS 30 STRUCTURE PADS 40 SOIL PIER FOUNDATIONS 50 ROCK PIER FOUNDATIONS 60 ROCK ANCHOR FOUNDATIONS 70 SPREAD FOUNDATIONS 80 REINFORCING STEEL CAGE 90 STUB ANGLES 100 ANCHOR BOLTS 110 CONCRETE 111 General 112 Preparation for Concrete Placement 113 Placement of Concrete 114 Curing and Testing 115 Protection of Concrete 120 BACKFILL 130 SAND STABILIZATION 140 SURFACE EXCAVATION 150 EROSION CONTROL 160 QUALITY ASSURANCE APPENDIX-1 Typical Proforma for keeping record of installation of steel structure foundations    PAGE NO 3 OF 21   TCSP12205R0/MAA TRANSMISSION CONSTRUCTION STANDARD TCS-P-12205, Rev 0   Date of Approval: December 16, 2006 10 SCOPE This standard provides general recommendations for selection of methods and  procedures that have been found practical for the installation of steel structure foundations with stub angles and anchor bolts for the overhead transmission line system of the Saudi Electricity Company (SEC), Saudi Arabia 20 GENERAL REQUIREMENTS FOR FOUNDATIONS 21 It shall be the responsibility of the Contractor to locate underground facilities such as gas, water, sewer lines, drain lines, electric power and telephone cables, etc, which may be encountered in digging or drilling holes and to  perform work in such a manner as to prevent damage to such facilities In case of any damage, the Contractor shall repair immediately all such facilities, to the satisfaction of the facility Owners If the facilities cannot be repaired immediately, the facility Owner shall be advised when repairs will be completed The Contractor shall inform the SEC Representative as soon as  possible after the repair works are completed but in no case, more than one week after the occurrence of any damage to such facilities When the damage is completely repaired, the Contractor shall secure and submit to SEC Representative one copy of a written release, signed by the Contractor and the facility Owners suffering the damages, within 30 days after completion of the repair work 22 The footings for tangent structures shall be placed so that the longitudinal axis of the structure cross-arms will lie in a plane perpendicular to the centerline of the transmission line The footings for angle structures except the terminal structures shall be placed so that the cross-arms will lie in a plane bisecting the interior angle formed by the two intersecting centerlines The footings for terminal dead-end structures shall be placed so that the transverse axis of the structure cross-arms shall be parallel to the transverse axis of the gantry structures placed in the substation If heavy angle structures are used as terminal dead-end, their footings shall be placed in the same way as that for the angle structures 23 The center of the top of each drilled pier shall not vary from its designed center  by more than four (4) percent of the pier diameter and pier shall be plumbed within one (1) percent of the total depth The centerline of the completed foundations shall be centered within 30 mm of the specified location across the line and 150 mm along the line   24 The transverse axis of the structure foundations shall not deviate from the  bisector of the interior angle of the structure by more than 30 minutes of the arc due to rotation of the entire foundation 25 Excavation of the structure foundations   shall be to the elevations and dimensions indicated on the approved drawings or as required to permit