The node of the member is the key to transfer the force, but the mixed scaffold, without reliable binding material, causes the node relaxation, and the frame will produce deformation, which can not meet the stress requirements of the foot on the frame
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18
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There are several kinds of slope protection measures commonly used in construction, and there are several forms of pit wall support? Answer: in order to ensure the safety of earthwork construction, there are three kinds of slope protection measures commonly used: covering method, net drawing method and soil bag slope pressing method
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How much should the top of the scaffold pole be higher than the roof? A: the top of the pole should be 1m higher than the parapet epithelium and 1.5m higher than the cornice epithelium
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Is the steel bamboo scaffold available? Why? A: not
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What necessary investigation and investigation work should be done before earthwork? A: geology, hydrology, underground cables, pipeline equipment, etc
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9
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2
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What sign should be hung on the unloading platform? Answer: the sign of limited load
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4
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3
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When the depth of foundation pit exceeds how many meters, special support design should be carried out? Answer: 5m
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(4) Click on me: “prevention and control of common quality problems and potential safety hazards” dictionary free of charge
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11
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When the site does not have the rescue conditions, they should call 119, 110 or 120 for help in time
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4
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13
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When someone is poisoned in the construction under the well (ground), how to give first aid? Answer: the personnel above the well (ground) should never go to the rescue, they must first send air downward, the rescue personnel must take personal protection measures, and send someone to report to the person in charge of the site and the relevant health management department
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What is the sequence of manual excavation? A: it should be carried out from top to bottom in layers, and it is forbidden to use the operation method of hollowing out the footing
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3、 “Three treasures” and “four entrances” protection 1
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8
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14
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How many meters of building height should be more than, double protective shed should be set up? A: more than 24m
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2、 Foundation support 1
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5
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11
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The personnel on duty should have regular physical examination, and only those who have passed the examination can work with certificates
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Can the scaffold be connected with the unloading platform? A: No, the unloading platform should be set independently
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What should be paid attention to when using safely? (1) The rope length of the safety belt used by the scaffolder is limited to 1.5-2m.
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6
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3
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What protective equipment should scaffold erection personnel wear? A: safety helmet, safety belt and antiskid shoes
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7
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What are the requirements for the counterweight of the hanging basket scaffold? (1) the hanging mechanism of the hanging basket or the roof trolley must be equipped with appropriate counterweight; (2) the counterweight should be accurately and firmly installed on the counterweight, and the counterweight of sufficient quality should be configured according to the drawing, which can only be used after being verified by the safety inspector before the hanging basket is used; (3) the anti overturning coefficient is equal to the counterweight moment to the forward tilting moment, and the ratio should not be less than Less than 2
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How many meters should the erection height of the portal scaffold not exceed? A: not more than 45m
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10
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What are the safety requirements of the integral lifting frame during lifting? A: it is strictly forbidden to stand on the frame during lifting
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The basic requirement of scaffold is not to shake, deform and keep stable after overall stress
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What kind of fastener should not be used? Answer: those with cracks, deformation, shrinkage and sliding wires should not be used
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15
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4
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2
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What are the main safety devices of the integral hoist? A: anti falling device and anti overturning device
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9
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At what stage should the scaffold and its foundation be inspected and accepted? (1) after the foundation is completed and before the scaffold is erected; (2) before the load is applied on the working layer; (3) after the erection of 10-13m height; (4) after the freezing in cold areas in case of gale and heavy rain; (5) after reaching the design height; (6) after the suspension for more than one month
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What kind of safety protection devices must be equipped for hanging basket scaffold? Answer: brake, travel limit, safety lock, anti tilting device, overload protection device
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The common supporting forms of pit wall are lining plate, cantilever, anchor, anchor and diagonal bracing
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How many meters is the safe distance between machines when digging foundation pit at the same time? Answer: it should be 10m
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During the use of scaffold, which members are strictly prohibited to be removed? Answer: (1) longitudinal and transverse horizontal bar, longitudinal and transverse sweeping bar at the main node; (2) wall connecting member
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At least 1.2m away from the edge and no more than 1.5m in height, soil and materials should be piled up at the edge of ditch and pit
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7
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What anti-skid measures should be taken for the miter ladder? A: there should be strong hinges and zippers to limit the development, and anti-skid measures should be taken when using on the slippery ground
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What are the safety regulations when there are external power lines on the outside of the scaffold? A: it is strictly forbidden to set up ramps on the side with external power lines
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How much should the operating distance be kept for manual excavation? A: for manual excavation, the horizontal distance should be greater than 2m, and the vertical distance should be greater than 3m
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How many years should seat belts be checked? A: two years
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21
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2
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22
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What are the requirements for the load of masonry frame and decorative frame? Answer: the load of masonry frame should not exceed 270Kg / m2, and that of decorative scaffold should not exceed 200kg / m2
.
Scaffold 1
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When excavating earthwork, should it be top-down or bottom-up? A: top-down excavation
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19
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20
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16
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10
.
3
.
What are the factors that affect the stability of the slope? A: (1) the type of soil; (2) the degree of soil wetting, the soil contains more water, and the slope is prone to instability; (3) the climate makes the soil soft; (4) the additional load on the slope
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What are the main reasons for the collapse accident in foundation pit excavation? Answer: (1) the excavation slope of foundation pit is not enough; (2) the top of foundation pit slope is overloaded or caused by vibration, resulting in landslide; (3) the construction method is not correct, and the excavation procedure is not correct; (4) over elevation excavation; (5) the support setting or removal is not correct; (6) the drainage measures are not effective
.
1
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12
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What do “three treasures” and “four mouths” mean? Answer: “three treasures” refer to safety helmet, safety belt and safety net; “four openings” refer to stairway, elevator wellhead, reserved hole and passageway
.
8
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What are the conditions for scaffold erection? A: scaffold erection personnel must be professional scaffolders who have passed the assessment according to the current national standard “management rules for safety technical assessment of special operation personnel”
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What are the regulations on the load at the side of the pit during foundation pit construction? A: generally, the height of the load at the side of the pit shall not exceed 1.5m and the distance shall be greater than 1.2m
.
5
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Which steel pipes are not allowed to be used for scaffold erection? Answer: steel pipes with serious corrosion, flattening, bending and cracks
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What are the requirements for the setting of the cross bracing of the portal steel pipe scaffold in the safety technical code for the construction of portal steel pipe scaffolds? (1) when the height of the scaffold exceeds 20m, it should be set continuously outside the scaffold; (2) the inclination angle between the diagonal bar of the cross bracing and the ground should be 45-60 degrees, and the width of the cross bracing should be 4-8M; (3) the cross bracing should be fastened with the upright bar of the portal frame by fasteners; (4) if the diagonal bar of the cross bracing is used The lap length should not be less than 600mm, and two fasteners should be used to fasten the lap
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What are the requirements for the deviation of the overall perpendicularity and levelness of the scaffold in the erection of the portal scaffold? Answer: the allowable deviation of the perpendicularity is 1 / 600 and ± 50mm of the scaffold height; the allowable deviation of the levelness is 1 / 600 and ± 50mm of the scaffold length
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What is the role of cross bracing on the scaffold? A: prevent the longitudinal deformation of the scaffold and enhance the overall stiffness of the scaffold
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17
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Is this sentence correct? Answer: No, because these two kinds of steel wire ropes cannot be lengthened
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When the load-bearing steel wire rope of the hanging basket and the safety steel wire rope are lengthened, there should be no less than three rope clamps
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Tips: click the “safety manager” above to get more safety knowledge
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6
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