This article is about installation of anchor bolts, lock nuts or Jam nuts for steel structure projects in commercial buildings, plants and refinery as per international standard and codes.
- PURPOSE.
- SCOPE.
- APPLICABLE DOCUMENTS.
- RESPONSIBILITIES.
- MANPOWER.
- TOOLS AND EQUIPMENT.
- METHODS/ PROCEDURE.
- MODIFICATION WORKS.
- QUALITY CONTROL.
- SAFETY PRECAUTION.
- ATTACHMENT.
Installation of Anchor Bolts, Lock Nuts or Jam Nuts For Steel Structure
1.0 PURPOSE
This method statement will serve as a minimum guidelines to carry out the installation of anchor bolts, lock nuts or Jam nuts to meet the requirement as per SAES-Q-005 sec.4.8.7, anchor bolts subject to uplift or vibration shall be equipped with as additional nut to serve as a lock nut to ensure against loosening.
2.0 SCOPE
2.1 This method statement will cover the installation works of lock nut or jam nut of anchor bolt for the steel structure of Commercial buildings, plants and refinery projects.
3.0 APPLICABLE DOCUMENTS
3.1 ARAMCO project specifications and standard.
3.1.2 SAES-M-001 Structural Design for Non-building structure.
3.1.1 SAEP-302 Instruction for obtaining a waiver of a Mandatory Saudi ARAMCO Engineering Requirements.
3.1.3 Schedule Q Saudi ARAMCO project Quality Requirements.
3.1.4 Saudi ARAMCO Safety Requirement for scaffolds.
3.1.5 Saudi ARAMCO construction Safety Manual.
3.2 Industry Codes and Standards
- AISC Steel Design Guide for Base Plate and Anchor Rod Design.
- PIP STS05130 Erection of Structural and Miscellaneous steel Specification.
- S-000-3130-002 Construction specification for Steel Structure Site Erection.
- ASME B18.2.2 Nuts for General Application: Machine screw Nuts, Hex, Square, Hex flange, and Coupling Nuts.
3.3 Inspection and Test Plan/ Method Statement.
- SATIP-M-001-01 Structural Steel for pipe rack, Steel supports and Miscellaneous.
- AA-036322 Standard drawing for anchor bolts.
4.0 RESPONSIBILITIES
4.1 Construction Manager shall responsible for all HSE matter and to study, analyse and schedule all construction activities with his department to include manpower and equipment line up as well as other possible resources required for the successful implementation of the construction work activities. Study all aspects of work procedure as per DEC/JGC technical Scope of work.
4.2 The structural supervisor shall study and review all necessary documents for the installation works in his area to include, technical scope of work, specification, bill of quantities, planned milestone dates and construction procedure.
4.3 Structural foreman shall be responsible for the direct work supervision at site to ensure that the work will be performed in accordance with Technical Scope of work and latest approved for
construction drawings. He shall monitor the availability of materials in line with his required schedule.
4.4 The Surveyor shall study and analyse if the location where the structure should be installed satisfied the condition or restriction of erection works on site. He shall coordinate with other discipline to visualize the possible conflicts in the drawings as well as in the schedules to provide other options in preventing unnecessary delays obstruction.
4.5 QC Inspector shall be responsible in monitoring and inspection of the work and ensure that the work is performed in accordance with Technical Scope of work and Standards.
4.6 Safety Engineer/ supervisor shall be responsible in monitoring safety aspects and ensuring that the work will be done in accordance with Safety Standard Procedure. He shall give reminders or advise to the workers to do the activity safety.
5.0 MANPOWER
5.1 Manpower will consist of the following, but not limited to as listed below.
- Structural Supervisor
- Structural Foreman
- Structural Fitters
- Steel Workers
- Safety Engineer/supervisor
- QC Inspector
- Helpers
6.0 TOOLS AND EQUIPMENT
6.1 To0ls and equipment needed should be in good condition and must be checked by structural Supervisor/Safety Officer prior to use in the construction area. These Includes but not limited as Below.
6.1.1 Auto level or level machine
6.1.2 Wrenches
6.1.3 Hammer
7.0 METHODS/ PROCEDURE
7.1 Preparatory Works
7.1.1 Prepare necessary work permit prior to start the works.
7.1.2 Secure Site Instruction regarding installation works to be done.
7.1.3 Prepare all tools and equipment needed.
7.1.4 Provide access scaffoldings if required.
8.0 INSTALLATION WORKS
8.1 All Anchor bolts subject to uplift or vibration shall be equipped with an addition nut to serve as a lock nut to ensure against loosening. refer to (SAES-Q-005 sect. 4.8. 7)
8.2 For thus anchor bolts of steel structure were short and not meet the requirements of AISC code of standard practice for steel buildings and bridges, thus additional nut cannot be installed.
8.3 With regards to the site condition and for thus anchor bolts were not meet the required projection with a minimum of two (2) thread; therefore, Jam Nuts shall be installed with a minimum thickness of 10mm, please refer to ASME B18.2.2-2015 page 8 Table-4, but, if the minimum of 10mm thickness of Jam nut were installed and the projection less than 2 tread and more shorten, we will apply the other optioned showing in Method-A Anchor bolts were not meet the required 2- thread bolt projection to be install with Jam Nuts with a minimum of 10mm thickness., Method-B with the further evaluation of the actual support reaction of foundation at Grid N1-2, it was found that washer plate may be neglected. Thus, ordinary washer plate (t=2-4mm) shall be installed instead of the thickened washer plate (t=12mm) and Method-C Anchor bolts were short and not meet the required of 2-thread bolt projection and more, the padding shall be installed down from the required elevation on the drawing to meet the required bolt projection, and shim shall be installed at the bottom of pipe shoe and equipment., and approved by DEC/JGC Engineering Department unless otherwise specified on field change sheet.
9.0 QUALITY CONTROL
9.1 QC inspector will be assigned to attend to the quality control assurance of this work.
9.2 QC inspector shall be the responsible to conduct site monitoring during the installation to ensure that all applicable requirements, codes and standard are complied with.
10.0 SAFETY PRECAUTION
10.1 Approved work permit should be obtained prior to start any repair works.
10.2 Work Execution shall be carried out in accordance with this method of statement.
10.3 All crew must carried out a safety risk assessment prior to start of any new activity.
10.4 The necessary manpower inclusive of supervisory staff, tools, equipment, materials, and other resources is required must be available and ready to use.
10.5 Workers should wear their PPE’s always.
10.6 Good housekeeping must be maintained in the duration of works.
10.7 Safety supervisor/ Engineer shall monitor compliance of entire working crew for the safety procedure until the work is fully completed.
10.8 Contractor shall make sure that all be incident and injury free.
11.0 ATTACHMENT:
ANCHOR BOLTS AND JAM NUTS DETAIL FOR INSTALLATION “METHOD-A, B & C
► JOB SAFETY ANALYSIS
ANCHOR BOLTS AND JAM NUTS DETAIL FOR INSTALLATION “METHOD-A”
Method-A; Anchor bolts were not meet the required 2- thread bolt projection to be install with Jam Nuts with a minimum of 10mm thickness.
LEGEND;
A-1 Anchor bolts Projection two (2) threads Minimum
B-1 Lock Nut
C-1 Anchor Bolt Nut
ANCHOR BOLTS AND JAM NUTS DETAIL FOR INSTALLATION “METHOD-B”
Method-B; with the further evaluation of the actual support reaction of foundation, it was found that washer plate may be neglected. Thus, ordinary washer plate (t=2-4mm) shall be installed instead of the thickened washer plate (t=12mm).
Note;
1. Ordinary washer plate shall not be welded on base plate.
2. See attached reference diagram of before and after condition refer to (FS-D250-1331-005 rev. 01)
ANCHOR BOLTS, JAM NUTS & SHIM PLATE DETAIL FOR INSTALLATION “METHOD-C”
Method-C; Anchor bolts were short and not meet the required of 2-thread bolt projection and more, the padding shall be installed down from the required elevation to meet the minimum of 2-thread for anchor bolt projection, and shim shall be installed at the bottom of pipe shoe and equipment.