Presentation on theme: "148. Portable ladder standards (1)Except as otherwise permitted by this Part, portable ladder design, construction and use shall meet the requirements."— Presentation transcript:
148. Portable ladder standards (1)Except as otherwise permitted by this Part, portable ladder design, construction and use shall meet the requirements of (a) CSA Standard CAN3-Z11 "Portable Ladders"; (b) ANSI Standard A "Safety Requirements for Portable Wood Ladders"; (c) ANSI Standard A "Safety Requirements for Portable Metal Ladders"; or (d) other standard acceptable to the minister. (2) A manufactured portable ladder shall be (a) marked for grade and use; and (b) used in accordance with the manufacturer's instructions.
154. Restrictions on use 1)Except as otherwise permitted by a manufacturer, a worker shall not work from either the top 2 rungs of a portable single or extension ladder or the top 2 steps of a stepladder. 2)A ladder shall not be used as a scaffold component or as a horizontal walkway, ramp or work platform support except where the ladder is part of a pre-manufactured or engineered system. 3)A worker shall maintain 3 points of contact when using a ladder. 4)A worker may only work from a portable ladder without fall protection where (a) the work is a light duty task of short duration at each location; (b) the worker's centre of gravity is maintained between the ladder side rails; and (c) the ladder is not positioned near an edge or floor opening that would significantly increase the potential fall distance.
Before the JOB consider the following: Is a STEPLADDER right for the job? Task Plan ahead for the tasks you will be doing Will you need to Move around while on ladder Carry items with you Work for more than 30 mins User Is the user fit enough to work at heights. Are they comfortable working at heights.
Is the Ladder strong enough? Maximum Static Vertical load Weight of user & additional weight carried Duty Rating Frequency and general condition
A ladder's duty rating tells you its maximum weight capacity. There are four categories of duty ratings: Type IA These ladders have a duty rating of 300 pounds. Type IA ladders are recommended for extra-heavy-duty industrial use. Type I These ladders have a duty rating of 250 pounds. Type I ladders are manufactured for heavy-duty use. Type II These ladders have a duty rating of 225 pounds. Type II ladders are approved for medium-duty use. Type III These ladders have a duty rating of 200 pounds. Type III ladders are rated for light-duty use.
Type TypeAdvantagesDisadvantagesWooden * Does not conduct electricity when dry * Natural insulator against cold/ heat * Heavy * Can dry and split * Can fail suddenly Aluminium * Light * Strong * Robust * Low maintenance * Conducts electricity * Conducts heat and cold Fiberglass * Does not conduct electricity * Can withstand cold and heat * Heavy * Chip or crack under impact * Can crack or fail under heavy load
1)User Inspections - Stiles - Locking devices - Platform - Steps or Treads - Non-slip feet- ID tag – readable? 2)People and Place safety - Not for work more than 30 minutes in duration - Not for work requiring more than 10kg weight to be lifted - Footwear – CSA safety - Clothing - proper fitting clothing - Check area – overhead, other people, firm base, doors, safe “drop zone”
3) Ladder set up -Is it fully opened and locked into correct position -Is it on firm and level base -Is it positioned with steps facing work -Multi design ladders must be set up properly for work being preformed 4) User guidelines -Secure grip at all times -3 point contact when climbing -Ensure all items are secure on ladder -Do not use top platform as work step -MOVE LADDER FOR WORK AND DO NOT OVER REACH
NL Regs section 153 Extension Ladder Length. A ladder shall be of sufficient length to project approximately one metre above the level of the upper landing to which it provides access, except where there is limited clearance and the ladder is adequately secured.
What should you do to safely secure extension ladders? Place ladders on a firm, level surface and ensure the footing is secure. Erect extension ladders so that the upper section rests on (e.g., in front of) the bottom section. This means the bottom section "faces" a wall or other supporting surface (see figures below). Place the ladder feet so that the horizontal distance between the feet and the top support is 1/4 of the working length of the ladder. The ladder will be leaning at a 75 degree angle from the ground. Raise and lower ladders from the ground. Ensure that locking ladder hooks are secure before climbing.
Erect ladders so that a minimum of 1 m (3 ft) extends above a landing platform. Tie the top at support points. Brace or tie off the ladder near the base. If there is no structure to tie off to, use a stake in the ground. Leave all tie-off devices in place until they must be removed before taking the ladder down. Maintain the minimum overlap of sections as shown on a ladder label. Refer to safety regulations. Note: When working 3 metres (10 feet) or more above ground, wear a safety belt or harness with the lanyard tied appropriately to the structure.
What should you avoid when using extension ladders? Do not use ladders near electrical wire. Do not use ladders near electrical wire. Do not set up or take a ladder down when Do not set up or take a ladder down when it is extended. Do not overextend. Maintain minimum overlap Do not overextend. Maintain minimum overlap of sections. Do not climb higher than the fourth rung from the Do not climb higher than the fourth rung from the top of a ladder. Do not use ladders on ice, snow or other slippery surfaces without securing ladders' feet. Do not use ladders on ice, snow or other slippery surfaces without securing ladders' feet. Do not extend top section of a ladder from above or by "bouncing" on a ladder. Do not extend top section of a ladder from above or by "bouncing" on a ladder. Do not leave ladders unattended. Do not leave ladders unattended.
What should you do to avoid overexertion while setting up an extension ladder? When setting up an extension ladder, use the following method to avoid straining muscles or losing control of a ladder. With ladders weighing more than 25 kg (55 lb), or where conditions complicate the task, have two persons set up a ladder, step by step, as follows: Lay a ladder on the ground close to intended location. Brace ladder base using helpers' feet. Grasp the top rung with both hands, raise the top end over your head and walk toward the base of a ladder. Grasp the centre of the rungs to maintain stability. Move the erect ladder to the desired location. Lean it forward against the resting point.
One person can erect a short ladder, step by step as follows: Place the bottom of a ladder firmly against the base of a building or stationary object. Lift the top of ladder, and pull upwards to raise a ladder to a vertical position. Transfer a ladder to its required position when it is erect. Keep a ladder upright and close to the body with a firm grip.
Scaffold erection and dismantling must be done by, or supervised by, qualified workers. The vertical supports of scaffolds must be Placed on a firm base or sill Capable of withstanding superimposed weight from the scaffold and anything placed on the scaffold Do not use pallets, boxes, concrete blocks, bricks, or other unstable materials to support scaffolds. All scaffolds must be erected plumb and level, and be designed for the intended use.
Scaffolds must be secured to the building structure approximately 4.6 m (15 ft.) vertically but not to exceed 6.1 m (20 ft.) vertically and 6.4 m (21 ft.) horizontally. NOTE: Narrow scaffolds must be secured to the structure when the platform height exceeds three times the smallest base dimension. Bracing requirements for prefabricated scaffolds must be installed according to the manufacturer’s instructions. Bracing for job-built scaffolding must meet standards acceptable to OHS. All scaffolds must be inspected before use by those who will use them, regardless of who erected them. No damaged or weakened scaffold may be used until it has been effectively repaired.
Aerial LiftSuspended “Pump Jack” “Pump Jack”
Supported “Framed or Fabricated”
Falls from scaffolds are one of the leading causes of injuries to construction workers. All scaffolds 3 m (10 ft.) or more above grade must have standard guardrails on their open side. A standard guard consists of: A top rail approximately 1.1 m (42 in.) above the platform An intermediate rail centred at approximately the midpoint of the space between the underside of the top rail and the upper edge of the platform Vertical guardrail supports spaced not more than 3 m (10 ft.) apart for wooden scaffolding Standard guardrails must be designed to withstand a static load of 550 N (125 lb.) applied laterally at any point of the top rail.
1.1 m (42") Top rail 2" x 4" or 2" x 6“ Intermediate rail 2" x 4" Maximum 3 m (10 ft.) between supports
Manufactured scaffold planks are available in various lengths and duty ranges. These planks must be installed and used according to the manufacturer’s and/or supplier’s specifications. Securing devices for aluminum/plywood platforms Examples of the various types of manufactured plank and securing devices for aluminum/plywood platforms
General requirements Wood scaffolding must be built using No. 2 or better lumber. To eliminate split, warped, or otherwise defective lumber, scaffold materials should be hand-selected. Progressively brace the scaffold as it is erected. Make sure there is firm contact between bearer blocks, bearers, wall scabs, and ledgers to provide maximum strength at connecting points. The number and size of nails and nailing patterns at connections should be consistent with good practice. As a guide, nails should protrude at least two-thirds of the thickness into the adjoining piece of lumber.
When holding power is critical, or when the scaffold will be used for an extended length of time, dip galvanized or spiral nails should be used. When scaffold components are intended to be dismantled and reused, double-headed nails may be used. Caution: Do not use the same nail holes on reassembly. Do not exceed the maximum allowable dimensions for bearers and upright spacing. Do not overload the scaffold. The spacing of vertical supports (uprights) and bearers must not exceed 3 m (10 ft.).
2" x 4" or 2" x 6” Top rail 2" x 4“ Intermediate rail 2” x 10” Platform 2" x 4" or 1" x 6“ Ledger 1" x 6" or 2" x 4" Brace Mudsill Maximum 3m (10ft) between supports) Note: For sake of drawing clarity, toeboards are not shown.
All scaffold planks must be inspected and tested before use. Lumber or manufactured scaffold planks used for a work platform must consist of at least two planks placed side by side to provide a work surface with a nominal width of 50 cm (20 in.), or nominal width of 30 cm (12 in.) for ladder-jack platforms. Scaffold planks should completely cover the area between front and rear vertical supports or the rear guardrail. Scaffold planks must be secured against any movement in any direction (including uplift).
Sawn wood planks must be hand-selected and in the following grades and sizes: Using the specifications above, the maximum span is: 3 m (10 ft.) for light-duty scaffolds 2.1 m (7 ft.) for heavy-duty scaffolds Minimum width mminches Select Structural — Scaffold Planks38 x 2352 x 10 nominal Select Structural — Joists & Planks48 x 2512 x 10 nominal No. 2 and Better — Joists & Planks*38 x 2352 x 10 rough sawn No. 2 and Better — Joists & Planks38 x 2352 x 10 dressed/nominal * Important: These planks must be doubled, one on top of the other.
Lumber used for planks must be graded and marked to the National Lumber Grades Authority (NLGA) Standard Grading Rules for Canadian Lumber. Scaffold planks must extend a minimum of 150 mm (6 in.) and a maximum of 300 mm (12 in.) beyond their supports. Scaffold planks must be held in place if there is a danger of the planks slipping off their supports.
Manufacturer’s specifications must be followed for testing laminated wood scaffold planks. The following is an acceptable method for testing sawn wood scaffold planks: Place test scaffold plank on two blocks. The block size and test span must be selected from the following table: Test Span SpanBlock Size 2.1 m (7 ft.)60 mm (23⁄8 in.) 3 m (10 ft.)92 mm (35⁄8 in.)
Have two workers who together weigh at least 148 kg (325 lb.) stand on the centre of the supported plank. Do not jump up and down on the plank. Reject the plank if any of the following events occur: The plank bends enough to contact the ground Cracking sounds are heard (indicating fibre overstressing) After removal of the test load, the plank fails to return to its original position (i.e., it remains bent) Scaffold planks passing this test should be identified by stencilling or end painting. It is also advisable to have the ends of the planks encased in metal sleeves or jackets for damage protection and additional identification.
To prevent damage, scaffold planks must be handled carefully, used correctly, and stored properly. Scaffold planks must never be overloaded, used as sills, or subjected to any condition that could affect the integrity of the plank as a working platform.
Single-pole wood scaffold for light duty The spacing of vertical supports and bearers of a single-pole wood scaffold for light duty must not exceed 3 m (10 ft.). On single-pole scaffolds, the inner ends of bearers must be supported by bearer blocks securely fastened to wall scabs Metal bearer bar 2" x 4" Upright 2" x 6" Bearer 2" x 4" Bearer block Minimum 610 mm (2 ft.) overlap 2" x 6" Wall scab
Pump jack scaffolds must be erected, operated, and maintained in accordance with the manufacturer’s instructions. A copy of the manufacturer’s instructions must be readily available on site for reference by workers. No more than two workers are permitted on a pump jack scaffold at one time. The maximum allowable safe working load is 227 kilograms (500 pounds). Each pump jack bracket must have two positive gripping mechanisms to prevent failure or slippage.
Wood poles shall Not be spaced more than 2.3 metres (seven feet) apart Be secured to the work wall by rigid triangular bracing at the top, bottom, and other points such that the maximum distance between braces is three metres (10 feet) Not exceed nine metres (30 feet) in height Require mending plates installed at all splices, when two by fours are spliced to make a pole Have the seam parallel to the bracket when constructed of two continuous lengths joined together
Metal poles shall : Be secured as specified by the manufacturer’s instructions Have a minimum of one brace up to 7.3 metres (24 feet), and above that height the bracing shall not exceed a maximum span of 4.9 metres (16 feet) from top to bottom Not exceed 15.2 metres (50 feet) in height unless certified by an engineer Poles must be placed on mud-sills or other adequate firm foundation.
The work platform must be Secured to the pump jack brackets A minimum width of 30 centimetres (12 inches) A bench platform, incorporated in the scaffold at an approximate height of 107 cm (42 in.), is acceptable in lieu of a top rail.
Here are the safety violations they spotted: The access ladder is too short (it must be long enough to project approximately 1 m (3 ft.) above the upper landing to which it provides access). The scaffold has a lockout tag placed on it, indicating the scaffold is unfinished and should not be used. There is a bucket near the edge. If excess material could fall off the scaffold, a toe board should be used. The worker doesn’t have safe access to the scaffold, and would have to climb through the guardrails to access the upper platform.
The worker doesn’t have safe access to the lower level of the scaffold, and would have to crawl through the brace to reach it. There is a dangerous gap in the middle of the upper level platform — a slip/trip hazard. The lower level platform is unfinished. The worker needs a guardrail to use it. The cross brace is missing from the back of the scaffold (it must be erected according to the manufacturer’s instructions). The mid-rail is missing on the upper platform, a key component of a guardrail system.
Firm Foundation To ensure stability, scaffold must be placed on Base plates Mud Sills Or other adequate firm foundation Capacity. Scaffolds must be capable of supporting their own weight and at least 4 times their maximum intended load
Bracing. Frames must be connected by cross, horizontal or diagonal braces, alone or in combination, which secure vertical members together laterally.
Fall Protection Consists of either “fall arrest” – harness and lifeline, or “fall prevention” – guardrails Must be in place when worker is at height greater than 3.05 m (10ft) or more at workers feet level All employees working at this level must wear fall arrest equipment Fall arrest: Can not be tied off to standpipes, electrical conduit, vents or the like
Guardrails Must be on all platforms over 4ft from ground or previous level of scaffold Must have vertical supports no more than 8ft apart Must not be no more than 1.07 m ( 3.51ft) from floor with a rail in between the two. Maybe be replaced by cross braces as long as intersection of brace is between (20-30inches) for mid guardrail and cm (38-48) inches for toprail.
Working Gap There can be no more than 14 inches between the scaffold and the structure worked on. Falling Object Protection All persons working around scaffolding must be protected against falling objects/debris by hard hat, toeboards, screens or netting.