Just arrived near the scene, looking at the works have seen the slogan: Safety comes first; Safety is a friend, foe or accidents such as: production must be safe, safe to produce; re-recorded in English where “Safety first”. Everyone assured that safety issues at the school are very focused.
Scaffolding is one of the safety issues key in construction. Scaffolding is a temporary structure, serving in construction to withstand the force of impact loads on the temporary side of the structure itself is not enough load or no load-bearing structural alternatives. Scaffolding support system and communication loads above need to be carefully calculated, fabricate and erect proper design guarantees safe use.
The requirements for scaffolding: scaffolding should be designed for each use case: According to Circular No. 22/2010 / TT-BXD of regulations on labor safety in construction: “Before we start work building must be designed and approved methods of construction, the construction method to demonstrate solutions to ensure safety for workers and machines, construction machines to each his work. “Contractors for construction works, including general contractors, main contractors and subcontractors on site are responsible for: formulating and approving design construction method, which specifies the security measures to humans, machines, equipment and buildings. Regular or irregular inspection of the actual happenings to adjust site construction methods, safety measures accordingly. Selection and layout workers on site technical expertise properly trained, qualified practitioners, adequate health as prescribed by law. Also provides a full range of equipment and means of personal protection for workers.
This provision in Circular 22/2010 / TT-BXD can be understood that before using scaffold prop formwork system made or used scaffolding as a means of access to the location of construction, the contractor should establish measures construction methods and institutions approved this construction method. Construction methods approved by the contractor must be approved by the owner in writing and agree to use for construction.
The design requirements for scaffolding construction methods:
There are two important criteria used when designing and construction scaffolding is:
– Enough strength (guarantee of intensity)
– To ensure the stability of the structural scaffolding
To ensure criteria meet the strength requirements need:
+ Calculate the full load contact scaffolding
The weight to calculate the formwork scaffolding refer Appendix 1 of ISO 4453: 1995 structural concrete and reinforced concrete tgi khoi- rules and acceptance.
+ In addition, the structure has a very heavy impact loads such as scaffolding formwork support system for structural beams pass in the construction of tall buildings, include all contact load impact scaffolding, load errors will lead to the problem is the insufficient scaffolding load capacity of rod material should be destroyed, but damaged.
+ When calculating the scaffold according to the intensity, to test the strength of each bar in the system and the load-bearing scaffold of the bar while matching audio frames into teaching.
+ Keep in mind to connect the short to long, need to check the intensity at the junction between the bars.
+ Scaffold material was good enough to be used. Need to closely examine the quality of materials used as scaffolds. Bamboo, Wood, was rot, termites or are missing due to the mechanical effects man-made, discontinue use. Bars, metal pipes in steel scaffolding if corrosion, rust or transfigured by bumped, dented, crushed nor used.
To ensure the stability of the scaffolding system to check:
+ Check the stability of each payment in accordance with the criteria of sound pieces.
+ Check the stability of the system when assembling the truss rod plane or space frame.
+ Security measures for monitoring the pressure (pressure side) of the head on the truss rod on the load side impact down scaffolding.
+ Need to ensure absolute safety for scaffold support structure below. This structure must be strong enough to support the load, not shift or slip because of forced shifting.
+ The scaffolding must be anchored, tied to the warranty against system-wide shift from horizontal loads such as wind, tornado or earth shaking for various reasons (blasting near, a large truck passed near , the vibration created another reason …).
+ Particular attention to the links between the scaffolding bar: link to ensure compliance with conditions designed to produce. Materials for the new links to ensure the design criteria and the binding sites must be constructed well, tight and durable.
Scaffolding material exposures rain, sunshine should be checked periodically and regularly. Examination should be 10 days in the dry season and 7 days in the rainy season.
+ Need to keep in mind when designing, testing and erection of scaffolding systems are bracing, structural bracing. Structural bracing and stabilizing brace scaffolding system, anti-morph and instability.
Safety risk: high falls when working on scaffolding (construction, repair, cleaning …) due to collapse or breakdown platforms, slippery … High Falls on the move, climbing along the scaffolding, travel on scaffolding. High falls for violating safety procedures are not using safety belts, high falls by working on scaffolding not installed proper technique, no floor scaffolding work or not safe, due to fracture, fall working platform. Russia xcao to move, climb, down the scaffolding. High falls under the influence of welding dazzle, due to insufficient light at night, so startled while working.
Therefore, to ensure the safety of people working on high must ensure the following requirements: 18 years or older, have a certificate of health to ensure work at height by the health authority level. Every 6 months to get a checkup once. Pregnant women, people with heart, blood pressure, deaf ears, eyesight not work on high. Having the certificate has been studying and test satisfactory safety by certifying unit director. Were fitted and manual means of protection when working on high: seat belts, clothing, hats workwear. Workers absolute must abide by the rules of discipline and safety work at height. Successful implementation of disciplinary rules and safety when working on high: necessarily have to wear a seat belt at the places specified. Travel, move jobs to follow the right place online regulations, prohibit climbing up and down to position high above travel bans on top of the wall, the top beam, the roof frame and the other structures under construction. At dark, heavy rain, high winds, thunderstorms or strong winds from level 5 and above is not working on high scaffolding, chimneys, water towers, towers, office or girders, roof 2 stories or more.
The north scaffolding for workers in elevated well as removing the scaffolding and scaffolding improvements must be made by the technical officer for new licenses are made.
Scaffolding to be sure. Handrail shall have a height of 1,15m above the floor 0,9-. The distance between the rig and the vessel shall not exceed 200mm.
– Scaffolding must be fixed to avoid swinging (if the rig crashes).
– Scaffolding husband to ensure rigidity, sure.
Cables hanging scaffold must satisfy the technical requirements of each month to check once if not guaranteed to be replaced. The first scaffolding stacked securely fixed to wire, cable. Guaranteed not to break, slipping between two platforms together. All materials used for scaffolding, pedestal must be checked periodically for a period not exceeding 6 months to determine the quality, including the quality of the welds. When working at a height of 2 m everyone must wear seat belts. Also, depending on the specific case, if at the bottom there are many obstacles: sharp objects, electrical, moving objects can endanger the lives of employees, must wear seat belts when working at a height of 0.5m or more.
Implementation of regulations on labor safety when working overhead. Have lightning protection systems for high scaffolding. High scaffold made of metal necessarily separate lightning protection systems. The acceptance and inspection of scaffolds must consider the following issues: the right diagram scaffold design, vertical column and plinth with wooden panels set up to prevent subsidence statistics do not? Incorporating adequate bracing and scaffolding anchors works to ensure rigidity and stability not? The strong links with it? Working platform edge, leaving holes and landing stair railing installation safe enough. For mobile scaffolding (scaffolding seat), while standing still, the wheels must be securely fixed. Way to move the scaffolding to the flat. Moving the mobile scaffold must do slowly. Prohibit moving mobile scaffolds on which if a person, materials, bins … Flooring work to be sure, guaranteed to withstand the load calculations, non-slip, gap between the flooring shall not exceed 10mm. Materials were chosen as the floor must have sufficient strength to meet the practical requirements, non-corrosive and anti-chemical erosion of the atmosphere.
