35 construction safety relevant sketches

Chapter 35Construction Safety Relevant Sketches/Safety Check

List For Some Activities

Construction Safety Relevant Sketchesa. Certain brief notes have been indicated on each sketch for reference.

Following explanation is given respecting those notes.b. Numbers indicated below give Sketch designationsc. These sketches have been produced based on personal knowledge &

experience from engineering field. d. An attempt has been made to cover all significant building activities that

expose threat to life & accidents do result in due to non compliance respecting all such safety procedures.

e. These procedures do not cost considerably but, save time & cost when there occur no accidents.

Sketches descriptions: 1. Trench Excavation Procedures for independent footing- shows location

of a ladder for ingress & egress, with provision of railing around working area. This is standard procedure adopted on all such activities keeping safety intact. Particularly, when excavation depth exceeds 1200 mm. Excavation carried out employing excavator. Equipment safety procedures must have been adopted while, equipment working. Site unexcavated area must be kept level & tidy.

2. Trench Excavation Procedure for major building with ordinary foundations- shows continuous trench, entries at ground, location of ladders & railing around area of work. Ladders serve ingress & egress purpose. Excavation carried out employing excavator. Equipment safety procedures must have been adopted while, equipment working. Excavated material not to be stockpiled on site but, transported to selected location for screening. Watering or safe cover required to be placed on stockpile from environment viewpoint. Site unexcavated area must be kept level & tidy.

3. Trench Excavation Procedure for major building with ordinary or raft foundation- shows mass excavation for major building either to have independent footing or raft foundation, ingress & egress ramp for vehicles,

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locations of ladders, may & may not be dewatering required. In this case, equipment like excavator, shovel, trucks, compactors, rollers, concrete transit mixers etc. would ingress & egress to perform excavation activity. Ramp width should be adequate to allow such movement. Ramp slope should not be very steep. Even, persons may use such ramp. Such excavations is called mass excavation used for raft foundations or for footings that are too congested, which congestion make it practically, significant not to excavate each footing separately. In that case, even foundation or plinth beams can be accommodated. Only drawback is that backfill quantity is increased. Safety measures implementations are convenient & site circulation for all further activities shall be efficiently performed.

4. Trench Excavation Procedure for major building with benching & well point dewatering system- shows major excavation done in silt/clay soil strata with benching provided. Dewatering is indicated installed on benching using well point system. Dewatering is shown being conducted in 3 stages. Miller’s or equivalent pumps installed for dewatering purpose to run 24 hours a day. Water drawn through well points, is conveyed through headers & discharged into a sewerage manhole. Ramp provided for easy ingress & egress. Locations of ladders indicated. Locations for bank men or flagmen indicated to guide traffic movement. Locations of rail indicated. By provision of ramp when, site allows required piece of plot or land, all equipment easily enter into low site areas for activities. Backfill quantity of course, increases but, savings on other activities, do outweigh that cost. Benches provided can also, be used for some other site activities purposes.

5. Trench Excavation Procedure for major building with benching & submersible pump dewatering system- all foregoing procedures as indicated in sketch 4 applicable with exception that dewatering may be done using submersible pump in place of well point system. Submersible pump is capable to drain out water in sandy soils. Pump is connected through hose to sewerage manhole to drain out water. Pump can be located at many corners with drain provided in slope, so that water flows to pump by gravity & continuously, dewatering operation is effected, until work reaches/progresses to ground level or above water table.

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6. Trench Excavation Procedure, when surcharge imposed on one side of trench - shows provision of supports to excavation side on which, building surcharge is imposed. Supports in trench shall be dictated on force imposed by superimposing/surcharging structure. Location & number of supports shall be dictated by width & depth of trench. Calculation required to be effected. Such support should be planned well in advance prior to commence excavation & agreed with safety manager or officer.

7. Scaffolding Working Platform for high structures- multi storied scaffolding system is indicated that may be used for either buildings or other structures. Accessing stair or stepped ladder is also, indicated installed for risk free movement. Standard scaffolding should be used. Hand railings should also be included as indicated. Other members such as toe board, planks etc. must be used. Scaffolding should be anchored at respective points as indicated for its stability to avoid its sway followed by overturning. Prior to installation, a site measurement based sketch should be drawn for designing scaffolding arrangement. This should be discussed with safety manager & decision made.

8. Scaffolding Working Platform for Buildings- shows plan of a building & a section of scaffolding. Also, shown a shading to cover scaffolding in hot sun to protect workers from impact of heat. Shade should be clipped at various locations so that, it does not go away with fast wind. Locations of anchors & handrails are shown for reference but, all arrangements should be well drawn for approval prior to installations.

9. Scaffolding for RCC Columns on Slab- shows scaffolding that can be used for a single column preparatory & pouring works, when column is located on a suspended slab. Locations of ladder, planks & railing are indicated. It is common practice, not to work on a single column for quantity of concrete in one column is not considerable. Platform construction costs considerably.

10.Scaffolding for Columns Concrete Pouring Platform- shows scaffolding to produce a working platform that can be used for pouring concrete into

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multiple columns in line. Columns are located on a suspended slab. Locations of scaffolding, ladder, planks & railing are indicated. It is preferred to carry out column works in groups to save time, accidents, circulation & cost of platform construction. Such platform should be made ready prior to inspections of preparatory works.

11.Radioactive Compound Embankments- indicates embankment constructed radioactive area around, so that non destructive testing NDT can be conducted safety preventing signals to transfer to out of embankment. This area is authorized for entry only, to approved personnel, so that exposure to radiations is minimized. Radiation time should be notified.

12.Scaffolding for High Rise & Multistory Building- indicates possible locations on various structural elements & sides of a high rise as well as, multistoried building, which shall certainly require erection of working scaffolding to carry out various structural & other activities. This is in addition to structural related scaffolding & supporting system.

13.High Rise & Multistory Building/Location of Tower Cranes/Hoists- same building as mentioned in sketch 12 above, is shown giving locations of tower cranes & respective boom lengths to be decided for a safe working. Also, indicated possible locations for fixing electrical operated hoists to raise material at isolated locations/areas not within reach of tower cranes. Such hoists should be allowed standby as well in case, tower crane fails working, hoists can be used on an ad-hoc basis. Locations of bank men are also, shown to control tower crane movements

14.A Hospital Building Complex Layout- indicated a lay out for a hospital complex for which other details are shown on other sketches. Sketch has been produced just to form a basis to describe safety procedures.

15.A Hospital Building Complex Locations for Tower Cranes- indicates worked out locations & boom length respecting tower cranes that shall be required to cover all buildings. These cranes shall be required ready & operational, when every building just commences with. Lower sectional

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portions shall be erected first. Extension vertically shall be carried out later, when construction progress so requires. Not necessary to commence with all buildings in parallel. Schedule should be charted out based on agreements. It is suggested that structural activities pose extreme safety dangers. Structures should be planned to be prosecuted in such a way that supervision degree is adequately available on site. Safety officers must be present on all structural activities during ongoing hours.

16.A Hospital Building Complex Scaffolding Requirements Locations- indicates locations of sides on buildings, where preparatory works scaffolding shall be required. Indicates possible locations on various structural elements & sides of a high rise as well as, multistoried building, which certainly require erection of scaffolding to carry out various structural & other activities.

17.Pipe rack Foundations safety requirements guidance- such foundations can be either proposed as ‘cast in situ’ or be proposed as ‘precast’. All safety procedures shall be applicable, when either cast in situ or precast method be used. Included procedures should be listed as excavation, provision of safety railing around, provision of ladders, blinding concrete measures, crane handling procedures for installation of precast foundations, measures, when being done cast in situ, application of water proofing or concrete protection safety measures etc. All indicated listed activities should be carried out using relevant safety criteria.

18.Pre cast/cast in situ light poles safety requirements guidance- indicates light poles that are generally, preferred precast due to consideration of heavy loads handling. All safety consideration as explained for concrete, formwork, steel bending etc. shall be complied with. For precast handling, all loads from member shall be calculated including handling loads. All procedures to be followed while lifting on to trailer, transporting to site, off loading to locations & installing. Bank men & rigger to be provided.

19.Below ground sump chamber safety stages guidance- indicates a complete structure below ground to function as a sump chamber of

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considerable size. Involves all structural members &activities. Excavations, blinding, waterproofing/concrete protection, formwork, steel bending, placing, concrete pouring & scaffolding shall be required. Water tightness testing & application of coating internally as well as, externally required. Safety measures pertinent to all foregoing activities should be complied with.

20.Precast manholes & covers safety handling guidance- indicates precast production of manholes of various dimensions. All such manholes should preferably be produced by pre-casting in casting yard. Major safety issues that arise for loading manholes to trailer, transportation, offloading & installing on locations. Calculate handling forces & use crane accordingly, with all safety procedure strict compliance. Manhole covers to be well lugged & produced. Installed accordingly on site fully complying with all safety procedures.

21.Grouting application below a tank – indicates a requirement to grout space below a tank & RCC foundation which requires chemical grouting. Manufacturer’s instruction to be complied with while, mixing & applying grout to locations. This typical procedure also, covers all grouting applications for whatever, stationary or vibratory vessels installed on site. Grouting can be either cement based or epoxy based. Safety measures for mixing as well as for applications to locations, should be complied with in line to manufacturer’s instructions.

22.Safety procedures for construction of a compressor foundation & table top- indicates a heavy structure, on which shall rest a vibratory compressor equipment. All such foundations on plants facilities are meant to bear major vibratory machines. Excavation in depth, blinding, major preparatory work in foundation, major reinforcing works, major pouring works are involved. Columns, which are also, thick elements do involve, Inserts, tangs, formwork, steel work, concrete pouring etc. On table top member, all such non excavation activities are involved with complex designs. All safety precautions closely require to be effected to such structures. Application of protective coating on above ground concrete shall also, be required.

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Therefore, all safety measures required to be adopted should be complied with.

23.Safety procedures guidance for seawater basin that controls supply of cooling water- indicates a seawater basin that is a major reservoir structure to be used for circulation of cooling water on a facility. Constitutes with RCC foundations slabs, major RCC walls, RCC pump houses etc. All safety measures applicable on structures shall be affected. Water tightness test shall be conducted. Above ground concrete protection shall be applied. Scaffolding is significant on such structure since, whole wall shall be cast in one go. Know that RCC wall being 8/10 m high, is poured on one go. This tank requires very serious application & adoption of pertinent safety measures.

24.Safety procedure guidance for LNG tank construction- indicates a major circular structure tank to contain major LNG quantity. Its main components are foundation, thick RCC/PSC walls, cupola on top & a platform on cupola. Internal real storage tank is not shown. RCC/PSC structure is a containment structure. Excavation safety procedures are required with dewatering arrangement. Soil improvement engineered fill is required. Raft foundation activities required. All walls to be constructed in stages vertically using quick form climbing propriety system. Working scaffolding shall be required both in &out of containment. Pre stressing shall be carried out by post tensioning system. All higher level activities shall be carried out for months. Cupola structure support shall be fabricated for permanent formwork to be lifted from ground by using upward compressed air gas pressure to its location at top & RCC work shall be affected on cupola. Platform on cupola shall be constructed following cupola work. Internal works in tank shall be carried out after cupola is completed. There shall be no ventilation inside tank. One opening shall be kept in lower stage portion of wall for purpose of ingress & egress. Air shall be supplied to inside containment & used air extracted. Temperature shall be maintained for comfortable working internally

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25.Traffic diversion for infrastructure services laying on roads’ crossings- indicates a location below which, certain infrastructure services pipes are to be laid. Traffic movement does not allow road to cross in full. Crossing shall be carried out working out in two stages. Sketch shows two halves where, traffic diversion is indicated. Traffic diversion is significant to work safely on such crossings. Work permit from operating authority shall also, be required. Various procedures are involved to obtain permit to work in such cases. Traffic diversion requires, sign boards, sleepers, cones, lights, bank men, flag men, equipment to work fast & reinstatement of smooth flow of traffic after work is over. Signs shall be of standards as used in location.

Safety Check Lists Required on Various ActivitiesExcavations more than 1.5 m to 2.5m

1. Ensure that excavation method statement has been approved duly discussed with safety personnel

2. Ensure that a toolbox talk is delivered to personnel working for this item3. Shallow trenches required for normal foundations/spread footings/rafts4. Ensure permit of work is available in case, work is carried out in controlled

area5. Check barricades installed around using temporary post, safety cones &

warning tape6. Check ladders located at 8 to 15 m locations7. Check excavated material is continuously removed from location8. Check excavated material transported to approved location for disposal

should that material is not planned to be reused9. Check excavated material is shifted to site located approved location for

piling & screening10.Check trenches are kept clear of earth piles so that earth does not fall into

trench, when workers work at formation level11.Check that site is frequently sprayed with water when atmosphere is wind

blowing & excavated material contains sand or clay12.Check workers use hard hats, masks, safety shoes & in sun safety glasses13.Check that traffic warning sign are fixed when vehicles are accessible14.Check night flashing hazard lights are installed for night dark hours

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15.Ensure adequate drinking water is available16.Ensure delivery of tea & lunch is arranged when, workers cannot leave site

during such hours.17.Ensure that adequate temporary supports have been installed in case, support

is required due to soft nature of soil or due to existing structures adjacent to certain side of trench

18.Check that during at stock pile, screening does not rise to sand blowing into atmosphere by spraying continuous water on stockpile

Excavations more than 2.5 m to 101. Deep trenches required for deep structures/foundations/spread beam

frames/basement rafts2. Ensure that a toolbox talk is delivered to personnel working for this item3. Ensure that excavation plan has been prepared & discussed with safety along

with excavation method statement.4. Ensure that method statement can be implemented without major deviations

on site5. Ensure permit of work is available in case, work is carried out in controlled

area6. Ensure that adequate ramp, benching etc in line to comply with method

statement sketches have been complied with7. Ensure that ongoing excavation does not result in certain unforeseen dangers

to site or to general public or to adjoining or to surrounding structures8. Ensure that in case, dewatering activity is included it has been installed in

single layer or in multi layers9. Ensure that pumps being used for dewatering do comply with standards

without causing any inconvenience to residents & others10.Ensure that drip trays have been installed below generators or other

equipment being used on site from which oil spill is expected11.Ensure diesel stored on site for generators & other equipment is contained in

sealed drums & a pump is used to extract diesel from drums without allowing diesel to drop on ground

12.Ensure that well points or submersible pumps are working in line to intended functions without causing any adverse impact on environment

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13.Ensure that excessive silt or clay particles are not being extracted from dewatering that could adversely impact on adjacent structural foundations

14.Check barricades installed around using temporary post, safety cones & warning tape

15.Check ladders located at 8 to 15 m locations16.Check excavated material is continuously removed from location17.Check excavated material transported to approved location for disposal

should that material is not planned to be reused18.Check excavated material is shifted to site located approved location for

piling & screening19.Check trenches are kept clear of earth piles so that earth does not fall into

trench, when workers work at formation level20.Check that site is frequently sprayed with water when atmosphere is wind

blowing & excavated material contains sand or clay21.Check workers use hard hats, masks, safety shoes & in sun safety glasses22.Check that traffic warning sign are fixed when vehicles are accessible23.Check night flashing hazard lights are installed for night dark hours24.Ensure adequate drinking water is available25.Ensure delivery of tea & lunch is arranged when, workers cannot leave site

during such hours.26.Ensure that adequate temporary supports have been installed in case support

is required due to soft nature of soil or due to existing structures adjacent to certain side of trench

27.Ensure that protective handrails have been installed at ground level, & other levels within vertical depth where, benching have been shaped

28.Dewatering system might be installed on benching as well, which should be checks to ensure whether or not, similar adverse impacts should not occur

29.Ensure that access ramp at certain locations is good for ingress & egress for vehicles, heavy equipment & personnel without causing any hardship

30.Check whether or not, adequate arrangements have been made regarding safety to passing vehicles & passers bay, when structure is located on road

31.Check that night flashing lights have been arranged to warn all 32.Ensure that collected water from sump at formation level or other benching

levels. Is being collected smoothly & pumped out to ground using hose pipes

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33.Pumped out water shall be continuously disposed into sewerage system manhole nearby or otherwise, transported by tanker for further disposal

34.Ensure that site is not spoiled by water pooling that can affect formation soil as well as water can further penetrate & move other structures

35.Ensure that standby pumps are available to meet emergency when working pump stops working

Piling 10 to 20 m deep1. Ensure that piling permit has been obtained from concerned authority2. Ensure that a toolbox talk is delivered to personnel working for this item3. Ensure that piling equipment is duly certified by third party & updated4. Ensure that all safety considerations have been met for steel cage fabrication5. Ensure that while, piling drilling is started, water shall certainly come out

under pressure6. Ensure that pooling up water is immediately pumped out from area7. Site shall not be allowed to be untidy leading to slush formation8. Ensure that personnel working on piling concrete pouring should use all PPE

including hardhats, overalls, gumshoes, masks & safety glasses9. Ensure when pile cutting activity is ongoing, all precautions are required so

that eyes & face are not subject to concrete chips10.During load test of piling, ensure that handlings of concrete major cubes are

conducted with right equipment or crane in compliance to all safety requirements

Blinding Concrete1. Plain concrete below foundations generally, 75 to 100 mm thick2. Ensure that a toolbox talk is delivered to personnel working for this item3. Ensure that workers use all standard PPE including gum shoes4. Since, blinding is also, received from ready mix plant, transit mixers &

concrete pump or tower crane or even, mobile crane should be utilized depending on site location & ease of construction

5. Ensure that concrete skip used if tower crane or mobile crane employed, should be clean, its door open able conveniently.

6. No concrete should drop during raising skip to higher level & down to blinding level

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7. When pump is employed, pump & transit mixer should be located at a distance that excavated trench sides do not subside

8. Transit mixers after delivering concrete should be washed at designated location only

9. Traffic diversion if required, should be arranged accordingly

Formwork FabricationVery significant activity when wooden battens & plywood are used as preparatory materials

1. Ensure that toolbox talk is delivered to all personnel available in fabrication shop respecting working on this item

2. Ensure that for fabrication purpose, a strong shade is available on site preferably constructed of steel pipes & steel sheeting

3. Ensure that plywood & wooden battens when delivered to site should be offloaded from truck or trailer safely using adequate crane & placed at suitable location located far away from yard

4. Ensure that all carpenters work in shade & sides are not closed5. Ensure that adequate carpenter’s tables to work on are available & electric

saws installed on these tables incline to equipment manufacturer’s instructions

6. Ensure that adequate electric supply is available to operate saws7. Ensure that fittings used for electric supply are industrial only8. Ensure that personnel use required PPEs including hand gloves 9. Ensure that wood & plywood to be used for fabrication are stacked or stored

properly stockpiled10.Ensure that fire extinguisher is installed in carpentry shop or yard11.Ensure that personnel know about its use12.Instruct personnel that saw should not be allowed to be collected daily13.Ensure that saw dust is removed from yard to some designated area from

where, it should be removed from site14.Fabricated formwork should be stacked properly & as soon as possible

should be shifted to site for preparatory works15.Ensure that fabricated sides are not carried to site by bearing on personnel

shoulders but, by using crane & some transport trailer if site is distant from fabrication shop

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Steel Reinforcing Bars FabricationSteel reinforcing bars cutting & bending to defined shapes is called reinforcement fabrication or bar cutting & bending activity

1. Ensure that for fabrication purpose, a strong shade is available on site preferably constructed of steel pipes & steel sheeting

2. Ensure that toolbox talk is delivered to all personnel available at activity location respecting working on this item

3. Steel reinforcement should be delivered in straight bars from factory to site by long trailers mounted with crane

4. Offloading should be done only by using trailer mounted crane or in case, not available, by other crane

5. Ensure that all steel fixers use proper PPEs including hand gloves6. Ensure that steel cutting machine & bending machines are suitable & fit for

intended purpose7. Ensure that steel fixers know about operations of such equipment8. Ensure that adequate electric supply is available & all connections are

industrial based9. Ensure that manual cutter when used, should be good enough for cutting

maximum size of bar to be used10.Ensure that during manual cutting, steel fabricators should not be

accidentally injured. Minimum force should be applied by steel fixer11.Better to make sure that cutting & fabrication activities are conducted in

major shop even if it is located remote from site 12.Adequate size bending dye should be made available 13.Bending dye should be good in make so that steel fixers comfortably by

applying minimum efforts, are able to bend bars14.Fabricated cages should be transported to site locations using cranes whether

it is tower or mobile.15.Transport should be used to shift cages from shop to crane location

Steel Reinforcing Bars ErectionFabricated re-bars require to be placed at locations

Foundations

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1. Ensure that toolbox talk is delivered to all personnel available at activity location respecting working on this item

2. Ensure that adequate PPE are used by steel fixers & other workers3. Ensure that steel placing work is done in normal temperature hours4. Ensure that adequate scaffolding has been arranged for steel fixers to site &

work from to tie up stub column bars5. Ensure that adequate low level platform or working planks are made

available to work on footing cages6. Ensure that steel fixers legs are not penetrated into re-bars squares from top7. Ensure that when work is done in deep foundation like cracked gas

compressors or other major thick members, steel fixers may be required to enter & work standing in foundation cage spaces, which case requires that easy ingress & egress should be arranged

8. Ensure that tie wires are not allowed to spoil site & continuously be removed

Columns/Walls1. Superstructure columns require on site assembly of vertical steel

reinforcement2. Ensure that toolbox talk is delivered to all personnel available at activity

location respecting working on this item3. Ensure that industrial scaffolding is available on site erected around all

columns & should be of required height4. Ensure that adequate planking has been arranged to stand upon & work5. Ensure that no danger exists for workers to fall from scaffolding 6. Ensure that top rail & toe boards are fixed when height is considerable7. Ensure that body harness are used when working on heights more than 2m

Beams & Suspended Slabs1. Ensure that toolbox talk is delivered to all personnel available at activity

location respecting working on this item2. Preferably, lighter beams reinforcement are fabricated to an extent feasible

in shop3. Make sure that these fabricated beams are transported from shop to location

by mechanical means &not carried on shoulders

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4. Ensure that form work to work on beams assembly or placement on site is already erected & that there is no danger from working point of view

5. Ensure that around edges, scaffolding has been erected to meet requirement & work can risk free move on

6. Full length bars should not be carried on shoulders using access stairs7. Ensure that placement work is conducted in normal temperature or either

during morning or during evening hours8. Ensure that suspended slab reinforcement is shifted to formwork ready

onsite9. Ensure that required projections are available on platform to work safely

Formwork Fixing or Erection

Foundations1. Ensure that toolbox talk is delivered to all personnel available at activity

location respecting working on this item2. Ensure that for deeper foundation, adequate scaffolding is erected on all

sides to allow comfortable working 3. When, propriety formwork is make sure that it is lowered to locations using

mobile crane or tower crane depending on weight of sides. Steel fabricated formworks are much heavier & therefore, relevant precautions should be resorted to safe erection

4. Check drawings prepared by vendor prior to allowing formwork erection on site

5. Check that all required members are available on site that covers all safety factors

6. Ensure that adequate access routes are available to provide completely risk free movement

7. Ensure that life lines are provided.

Columns & Walls1. Ensure that toolbox talk is delivered to all personnel available at activity

location respecting working on this item2. Ensure that adequate working platforms are available to work upon3. Ensure that fabricated materials is shifted to locations using crane

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4. Ensure that adequate space is available for form supports5. Ensure that safety belts/body harnesses are available for use if required

Suspended Slabs1. Ensure that toolbox talk is delivered to all personnel available at activity

location respecting working on this item2. Ensure that approved design of formwork drawing from vendor is available

for system support3. Ensure that peripheral scaffolding is made available prior to commence

works around4. Ensure that approved drawing is effectively used for erection of system5. Ensure that access stairs & platforms are available 6. Ensure that use or not to use tags on access stairs & ladders are controlled to

requirement & records made7. Third party certification respecting adequacy of system should be obtained

preferably by vendor who delivered materials based on designs

Major Pours1. Ensure that toolbox talk is delivered to all personnel available at activity

location respecting working on this item2. Major pours may run for many hours or even continued for days & nights3. Ensure that all safety arrangements have been arranged for efficient working

of personnel4. Ensure that workers do not get fatigue which requires intermediate rest

pauses5. Ensure that workers do not pull much of concrete that requires heavy pulling

force6. Ensure that workers do not use vibrator by mishandling7. Ensure that all workers engaged on pour do get liquids or tea etc.8. Ensure that workers use gum shoes &mask as well9. Ensure that they consume adequate quantity of water during operation10.Ensure proper direction is signaled by bans man deployed for pump

operator’s assistance or for crane operator’s assistance

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11.Ensure that transit mixers waiting in quee on site, do not encroach roads & other access. Traffic control bank men should be deployed for smooth flow of traffic

12.Make sure during night hours, adequate diversion arrangements should be made with provision of lights

13.Make sure that transit trucks wash after delivery of concrete &dispose slurry on designated location only

14.Make sure that personnel spraying curing compound should use mask & spray from some distance off concrete surface

15.Pour locations should be cleaned after completion of pouring

Striking Forms1. Ensure that toolbox talk is delivered to all personnel available at activity

location respecting working on this item2. Ensure that forms are not struck abruptly without using sense3. Ensure that adequate scaffolding is erected to work on for loosening fittings4. Ensure that one by one form members are disconnected5. Ensure that crane could be utilized to remove heavy members/sides6. Ensure that form after dislocation should not be thrown from height to

ground7. Ensure gradual operation to remove all form members8. Supporting system members should not be thrown from heights9. Surrounding area should be barricaded for entry for non related personnel10.Striking formwork can cause accidents therefore, it is very attentive activity

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35 construction safety relevant sketches

Engineering