If using mobile plant, assess the risk to find out if any part of the excavation may be left unsupported. ��F)l��^:����1O�oҵ��M'�3. For example, placing spoil near the excavated face may cause it to collapse. the shoring is designed to resist the forces calculated for the full depth of the excavation, and. Whilst it is usual for most services to be found at depth of at least 300mm, it is quite possible to find a duct laid just below ground level, particularly near to the external walls of a house. the operator remains inside the excavator unless threatened by fire, all workers keep well clear of the excavator and anything else in contact with electricity, and shuffle to clear the area, to initiate an emergency response, including with the service owner to shut down and isolate the affected service. Watch Queue Queue. For example, consider the hazards to a person: To manage the risks, consider all relevant matters including the: Complete and monitor hazard identification regularly to make sure controls are working and that no new hazards have been introduced. If risks remain for those installing shoring, put other suitable controls in place to ensure the health and safety of workers entering the excavation. A land use consent may be required from the local authority to excavate or disturb soils at the site. Gutta percha and various rubber compounds were used for insulating and water proofing the telegraph and early telephone cables. Primary 09 5373260. Unless the excavation is so shallow those outside can see and talk easily to those at the face, provide an effective signalling system and interlocks that prevent winding gear from operating while personnel are moving. Is the trench safe from exhaust gases from plant working in the trench or nearby? Kiriwai Place. Are footbridges with guard rails available and being used? Lagging does not extend below the excavation’s base so do not use H-pile shoring and lagging where there is potential for base heave or water and soil flows. An unsupported excavation can create an unbalanced stress in the soil which, in turn, causes subsidence at the surface and bulging of the face. Before any excavation takes place workers should know what is underground and what is overhead. A long narrow excavation, deeper than it is wide, and open to the surface along its length. In the first instance, contact the service owner for advice prior to works commencing. Steel sheet piling is normally used on major excavations such as large building foundations, where large embankments need to be held back, or where the excavation is near adjoining buildings. Sheet piles are available in various lengths, thicknesses and profi les and interlock to provide a continuous wall. In general, it is a person who carries out work in any capacity for a PCBU. Usually workers need to access this trench to work, for example for waterproofing the retaining wall. Powered mobile plant should be equipped with an appropriate combination of operator protection devices, for example an enclosed cabin and seat belts, to prevent the operator from ejecting from the cab or being struck by falling objects. Our team of professionals are reliable, efficient, and have years of experience drilling for all purposes.Using directional drilling, we provide or assist with the installation of power, fibre optic and telecom ducts, water mains storm water, and sewer installations where other methods may not be practical. any longer term effects on stability and safety of the excavation. not be altered, dismantled, or interfered with except on the instructions of the employer or a representative of the employer. Most excavator related deaths involve a person working in the vicinity of the excavator rather than the driver, use a trained spotter in a safe position to direct excavator operation and any pedestrian movements, make sure the spotter and operator understand the signals they will use and agree on the way to communicate with each other, select plant with minimal tail swing if slewing in a confined area, maintain over 0.5 m of clearance between any part of the machine, particularly the ballast weight, and the nearest obstruction, checks the attachment is securely attached by the quick hitch. Identify hazards and controls before the work starts. A horizontal step cut into an excavation face to provide horizontal bearing and sliding resistance. make sure operators can see areas where people may be at risk from the operation of the machine, equip excavators with adequate visibility aids or use a spotter/s, keep people away from areas of plant operation. make sure the operator is familiar with and able to implement and manage any quick hitch used, conduct a site assessment and carry out any remedial action. In fact, we have gotten so many requests for an explanation of universal color codes for utilities, we decided to answer them here. The ground conditions will have a significant impact on what excavation method to select and the controls to use. suspected asbestos containing material (ACM). check with the service owner for their duct and marking colours and identify what the underground services are and their status. The Resource Management Act 1991 contains prohibitions against the discharge of contaminants into or onto the land, the water, or the air unless the discharge is expressly allowed by a national environmental standard, a rule in a regional plan or a resource consent. being trapped by the collapse of an excavation, working in an excavation being struck by a falling object. Excavators in a range of sizes can: Make sure to use an appropriate excavator for the excavation work and properly plan and risk assess any lifting operations by the excavator before carrying out the operation. Eliminating a risk is the most effective control. Does everyone know where the buried services are and are they clearly marked? (or sloughing) may occur as a result of tension cracks, In addition to sliding, tension cracks can cause. Phone. 0000036085 00000 n WHO WE ARE. To do this, excavate to a maximum depth of 600 mm below the base of the shoring, if: Control the risk of ground collapse and carefully visually inspect for any effects of: Shoring that slightly compresses soil without allowing the soil to move outward can produce an arching effect in the soil. Reporting, emergency, and response procedures need to be in place for all identified risks and hazards. If it is not possible to separate the traffic, forbid worker movement while spoil or plant is being moved, and vice versa. For example the weight of a bridge. Apply MADs from the hand-held tool to the exposed service. Do a final check when at the site and look over the area before starting work. Briton Detection & Inspection offer underground leak services in Northland, Auckland, Waikato and Bay Of Plenty regions to the Civil, Industrial, Residential and Government sectors. New Zealand Standards. Always check with the service owner, as they may have their own specific requirements for work on their service. 0000033474 00000 n Maintain an atmosphere that is fit to breathe, limiting any contaminants to safe levels, by: To help determine safe levels, compare the results of air monitoring to workplace exposure standards. x�b```f``Kc`e``�� �� ,l@���|!ʢ�@�TN*�(��"�������e��H����R�788��Eָ�8ƾ�͍m=�i����X��T2�b�b�f�ž�>���Ov!��l���l[�~����ezš�v�u[��B�l����YeY���La��z('�1�U�m3�6�-l �l\�,n�gּ9s��TϪ5�� љ3�V�SkN�:��ԛW@��g�}����x+v�X�5��E���Ѳߛ��K7ޫQ�bl�/al�W;� ���!���!\"2J���ws`��Ngr-��!��J��� �`s���pa�`�@[@�m1���*x�S rLc�w�d@�q-C �-���p��iM�,>®)�Q��P���̓�3 #�����"�S#'���_�i fZ�ǛX]���"���O����9�&#��&%5̼��`3��9�H����8 &U�VFATH�� �!`��f��M�� ���JE.�X�����!9�Q� B For more information refer to NZTA’s Code of Practice for Temporary Traffic Management(external link). Where shoring extends above 200 mm toe boards are not required, installing and securing covers over excavations during non-work times, installing guard rails and edge protection into the ground immediately around the excavation, installing landing platforms or scaff old towers inside deep excavations, providing clearly defined pedestrian detours, providing alternative access and egress points for emergency use. Table 9 outlines some excavation hazards and some controls to consider. A competent person should frequently check the soil condition and the state of shoring, benching, battering, and excavated faces for signs of earth fretting, slipping, slumping, or ground swelling. Telephone cables were employed for aerial, underwater and underground … HSE Regulation 24 requires that any shoring, so far as is reasonably practicable: consists of materials that are suitable for the purpose for which they are to be used, of sound quality, and adequate in strength for the particular use. All excavation work must comply with HSWA and associated regulations. • Any underground service or asset within an easement, and in some cases on private property. This guideline is for persons conducting a business or undertaking (PCBUs), workers, upstream PCBUs, and competent people involved in excavation work. Shoring provides support to excavated faces to prevent soil moving and ground collapsing. competent employees are working near exposed live parts. Is the surface clear of plant, spoil heaps and materials for at least 1 m from the edge of the excavation? 0000011236 00000 n Orange – Telecommunication, alarm or signal lines. Soil arching allows excavated walls shored with struts to stand even with no sheeting or lagging between the struts, without the soil behind flowing out. Operators of powered mobile plant can often have severely restricted visibility of ground workers or nearby pedestrians, particularly those close to the plant. Colours Bay of Plenty. If hospitals and other buildings with equipment sensitive to shock and vibration are nearby, consider the need for special precautions. Cutting a drive is particularly hazardous as it introduces the risk of trapping workers with no alternative escape route. There are three main types of controls to prevent ground collapse. APWA Uniform Color Code for Marking Underground Facilities Underground facilities shall be marked in accordance with the following designated color code: White. 0000034761 00000 n The ability for shoring to use soil arching depends on the consistency of the soil. (2) In Regulations 24 and 25, the term employee, -, (a) in relation to an employer of the kind described in subclause (1)(a), means an employee of that employer; and. 0000034189 00000 n excess water pressure in sandy soil which may cause boiling and saturate the soil and increase its plasticity, soil dryness may reduce cohesion in sandy soil and soils with high organic content, which then crumble easily, prolonged stress, may cause plastic deformity (squeezing or flowing). 0000033946 00000 n Underground cables. Ventilation systems help to maintain adequate oxygen levels and dilute flammable gases, fumes and certain dusts, such as coal and sulphide. Plant defects should be reported immediately to the PCBU. Trusted local business listings and maps. (5) The conditions may include very weak or sensitive soils, groundwater that require specialist dewatering or locations near structures and sensitive infrastructure. These are either roll-over protective structures (ROPS), falling object protective structures (FOPS) or both, depending on the application. The condition of soil surrounding excavations can change quickly when the soil dries out, the water table changes or water saturates the soil. When organising site security and site access, consider: Safety fences prevent people from gaining access into hazardous areas. identify which workers or others are at risk, determine what sources and processes are causing that risk, identify if and what kind of controls should be implemented. Phone. Please read this guidance in conjunction with all relevant industry standards that apply to you as a PCBU. Trenches are generally excavated to install or maintain underground services or to otherwise investigate beneath the ground surface. If a gas line is ruptured, nearby running plant could cause the gas to ignite. You need to know what services are where. Benching and battering of excavation walls can minimise the risk of soil or rock slipping onto the excavation. contracting chain, where contractors and sub-contractors provide services to a principal contractor and client. engulfment in a stored free flowing solid or a rising level of liquid that may cause suff ocation or drowning. GPS MAPPING . The Worksafe New Zealand publication 'guide for safety with underground services' can assist you to work safely around buried services. Employers and the person in control of the workplace must notify WorkSafe at least 24 hours’ before doing any hazardous work (as defined below). But to avoid damaging, or killing, yourself. Keep the floor of the excavation clear of anything that would impede workers’ safe egress in an emergency, including: Use ladders constructed of suitable materials, conforming to appropriate standards, and maintain them in good condition. While this guidance has not been updated to reflect current work health and safety legislation (the Health and Safety at Work Act 2015 and regulations), it may still contain relevant information and practices to keep workers and others healthy and safe. PCBUs must always eliminate a risk if this is reasonably practicable. 0000034560 00000 n Excavations with face more than 1.5 m high. Battering reduces the risk of ground collapse by cutting the excavated face back to a safe slope. surcharges or vibrations that could destabilise the excavation, such as vehicles, buildings or stockpiled materials, the potential for the excavation to disturb or damage nearby structures, underground or overhead services, safe working methods and construction methodologies. Plant should approach end-on to excavations. 0000018358 00000 n For more information on the risks of work near underground services, refer to WorkSafe’s Guide for safety with underground services. LED street lighting. availability and capacity of equipment and temporary works. Have deliberate, planned ways to engage and support participation. Slide-rail shoring is diff erent from trench-shoring boxes and shields, because all parts including posts, panels, and rolling-strut assemblies move during the excavation. The risk of striking and fracturing a service while excavating increases with the use of mechanical excavation methods. Check with your local council for specific rules that apply in your region. A competent person should design any timber shoring conforming to the timber sizes and grades specified in Table 6. AS/NZS 2648 underground service warning tapes. Put processes in place for reporting incidents, damage, and defects. Check the excavation each day before starting work and after any event that may affect its stability. Follow the manufacturer’s or supplier’s instructions when storing or transporting trench-shoring boxes and shields. White: Pre-marking of the outer limits of the proposed excavation or marking the centerline and … Underground utility designating is the process of identifying and marking underground utilities. • Any underground service or asset within the road reserve that is from one property boundary line to another. any shoring or excavation support requirements. This is to make sure the shoring is fit for purpose. what ways are suitable to eliminate or minimise the risk. Are underground feeds better than overhead feeds? Structural member used to hold soldiers against an excavated face or to press walers apart in a close sheeted excavation. PCBUs must manage risks that could result from work. Assessment by calculation or test, BS EN 1537 Execution of special geotechnical works – ground anchors, BS 8081 Code of practice for grouted anchors, FHWA-IF-99-015 Ground anchors and anchored systems, Approved Code of Practice for Operator Protective Structures on Self-Propelled Mobile Mechanical Plant, Code of Practice for Temporary Traffic Management: Part 8 of the Traffic Control Devices Manual New Zealand Transport Agency www.nzta.govt.nz(external link), Excavation Work Code of Practice Safe Work Australia www.safeworkaustralia.gov.au(external link), Guide for Safety with Underground Services (PDF 349 KB) [PDF, 349 KB] WorkSafe New Zealand, Health and Safety at Opencast Mines, Alluvial Mines and Quarries (PDF 12 MB) [PDF, 12 MB] WorkSafe New Zealand, National Code of Practice for Utility Operators’ Access to Transport Corridors New Zealand Utilities Advisory Group (NZUAG) www.nzuag.org.nz(external link), New Zealand Electrical Code of Practice for Electrical Safe Distances (NZECP 34:2001) WorkSafe New Zealand, Safe Use of Machinery WorkSafe New Zealand, Using Quick Hitches Safely (PDF 792 KB) [PDF, 791 KB] WorkSafe New Zealand, Workplace Exposure Standards and Biological Exposure Indices WorkSafe New Zealand, Your Guide to Working Safe on the Road and Staying Alive New Zealand Utilities Advisory Group (NZUAG) www.powerco.co.nz(external link). Prevent collapse – shore, bench, or batter back. When selecting the most appropriate dewatering technique, consider: Figure 44 and Figure 45 show two dewatering techniques. 0000002245 00000 n For years, New Zealand has been seen as a plan B for wealthy preppers. Avoid striking or undermining services. 0000036339 00000 n In some workplaces, the same person could fulfil a number of roles (such as designer and supervisor), depending on their level of competency. Your council might have additional rules that need to be met. Home Services About Contact. the soil is good enough for the excavation to stand when excavated, to install support as soon as practicable, to achieve at least minimum pressure when pumping out hydraulic support and to maintain it, to use a minimum of three sets of support with a maximum spacing of 1.5 m. to minimise the length of time the excavation is open. telling the PCBU when they become aware the PPE is damaged or defective, or when it needs to be cleaned or decontaminated. Visit a service centre. Is the area affected by blasting or other heavy vibrations? attachment information clearly displayed or present with the machine identifying: setting up a system for checking that the pin is in place before starting the work and every time a diff erent attachment is fitted. Trimming can often be accomplished from outside the excavation by shovelling or pushing the material with a long-handled tool or shovel to the bottom of the excavation, where it can be picked up by mobile plant. When removing shoring, take apart and extract it in reverse order to its installation. Make sure controls prevent anyone being harmed, so far as is reasonably practicable. If this happens when lifting over or close to a person the result is likely to be fatal. Call us today! Liaise with all service owners as there are often multiple services and multiple owners. Phone. The competent person should design hydraulic support to resist the expected ground pressures and potential for collapse. Store spoil away from the excavation’s zone of influence plus 1 m. If spoil is placed close to an excavation due to obstructions like fences, buildings, or trees, the weight of the spoil may overload the excavated faces. By cutting the excavated face as safe as possible in the use explosives... Puncheons and sole plates ) injure or harm workers and others nearby the struts to move outward likely... Do you need to be built and guidance specifically about electrical or gas safety call... 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