Safety technical briefing on construction construction sub-items

Safety technical briefing on mud hydraulic engineering

1. Masonry construction:

⒈Excavation of earthwork , keep a distance of 2~3m between the two people, and excavate layer by layer from top to bottom. It is prohibited to use the method of digging holes.

⒉ Excavation of trenches, foundation pits, etc. should be graded according to the soil quality and the on-site construction personnel. The excavated soil should be piled 1m away from the edge of the pit, and the pile height should not exceed 1.5m.

⒊When laying the foundation, you should check and pay regular attention to the changes in the soil quality of the foundation pit and whether there is any cracking. Materials should be stacked more than 1m away from the edge of the pit. When it is necessary to install protective wall support in the foundation pit, operators should set up ladders to go up and down, and are not allowed to climb or jump, and materials transported must not collide with the support.

⒋When the height of the wall masonry exceeds 1.2m, scaffolding should be erected. When using inner scaffolding above one floor or exceeding 4m in height, a safety net must be hung outside the wall. When using outer scaffolding, it must be tied to a protective railing before operation.

⒌When using internal frames to build exterior walls, the shelf plates should be 500px lower than the exterior wall, and a safety net should be hung outside the wall according to regulations.

⒍The pile of bricks on the scaffold shall not exceed three skins, and the piles of anvils shall not be piled at the corners of the shelves. Except for the operation layer, only sporadic materials are allowed to be piled on the upper and lower skin racks, and materials are not allowed to be piled on multiple layers.

⒎When building a wall at a high place, the anvil should face the wall. After the work is completed, the broken bricks and mortar on the scaffolding boards and brick walls should be cleaned to prevent them from falling and hurting people.

⒏ It is not allowed to stand on the wall bricks to lay bricks, hang wires, scrape seams, check the verticality of large angles, and clean the wall.

⒐ It is not allowed to modify the stone on the top of the wall or on the shelf, so as to avoid shaking the wall and affecting the quality or causing stones to fall and injure people.

⒑ It is not allowed to build masonry on a wall that is higher than the chest level, to avoid collapsing the wall or accidentally falling when adding stones, causing a safety accident.

⒒ Stones must not be thrown downward. When transporting stones up and down, the scaffolding boards must be firm and anti-slip strips and handrails must be nailed.

⒓When constructing at cornices and openings, operators should face outward to avoid stepping on the air and falling. Do not sit on cornices, exterior walls or other dangerous places to rest.

⒔ Do not use bricks to place bricks on the elevated board when working at heights, nor is it allowed to stand on the elevated board with bricks.

2. Concrete construction:

1. When using a vehicle to pour concrete into the foundation pit or hopper, measures should be taken to block the vehicle, and no excessive force or withdrawal of the handle is allowed.

⒉ When transporting concrete with a tic-tac-toe crane, the handle of the bucket truck must not extend outside the crane. The truck must be stabilized. When transporting to the floor, the crane must be stopped before anyone can enter the crane to push the cart. .

⒊The chute and string tube sections used for pouring concrete must be firmly connected. There should be protective railings at the operating area, and you are not allowed to operate directly on the edge of the chute.

⒋Concrete pouring frames, beams, and columns should be equipped with operating platforms, and it is not allowed to operate directly on the formwork or support.

⒌ Pouring the arched structure should be carried out symmetrically and simultaneously from both sides of the arch; protective measures should be taken when pouring ring beams, ponchos, and balconies; when pouring the silo, the lower opening should be closed first and temporary Scaffolding to prevent people from falling.

⒍Wear rubber shoes when using a vibrator. Do not touch the switch with wet hands. The power cord must not be damaged or leakage. The wire must be elevated and the switch must be supervised.

⒎When the concrete mixer is in operation, no one is allowed to put tools into the barrel to clean the material. When the feed hopper is raised, no one is allowed to pass or stay under the hopper.

⒏When the concrete machine is out of service, the raised hopper should be equipped with a safety plug or a safety pin.

Woodworking safety technical briefing

1. General provisions:

⒈The settings of workbench and machinery should be reasonable and stable, the working place and passages should be smooth, and the materials , Semi-finished products should be stacked in piles without affecting traffic.

⒉ Do not wear gloves when operating woodworking machinery to prevent the gloves from getting caught in the machinery and causing accidents.

⒊Sawdust and shavings in the wood mold workshop should be cleaned up every day. Smoking and making fire are prohibited in the workshop.

2. Formwork support and removal:

⒈ Use wood for support. The material should be peeled and the tips should be sawed flat. Rotten or twisted materials are not allowed, and bent materials are not allowed. For miscellaneous materials with large and small tail diameters, the tail diameter of the top support shall not be less than 200px within 4m, and shall not be less than 250px within 5m. Above 5m, it shall be designed.

⒉The first horizontal support should be installed at a height of 1250px from the ground, and then an additional horizontal support should be installed every 2m. Horizontal braces should be set vertically and horizontally.

⒊The plywood at the top support joint shall not be smaller than three sides, the splint shall not be smaller than 50×8×62.5px, and adjacent joints shall be staggered from each other.

⒋The ground at the bottom of the support should be leveled and compacted, and wooden pads should be added. Bricks are not allowed. The wooden wedges used to adjust the high bottom should be nailed firmly. The wooden wedges should not be placed too high (preferably 2 pieces) ).

⒌The wooden truss support formwork should be strictly inspected. If serious deformation, loose bolts, etc. are found, they should be repaired in time.

⒍The mold support process should be carried out. The next process must not be carried out before the formwork is fixed. It is prohibited to use pull rods or supports to climb up and down.

⒎ When setting up column formwork with a height of more than 4m, the surroundings must be firmly supported, and a workbench must be set up during operation. If the height is less than 4m, a horse stool can be used for operation.

⒏A temporary workbench should be set up when supporting independent beam formwork. It is not allowed to stand on the column formwork or walk on the beam bottom formwork.

⒐The two people must cooperate with each other and work together when carrying the template. Transfer templates and tools should be raised and lowered using transportation tools or tied with ropes, and must not be thrown around.

⒑It is not allowed to pile large quantities of formwork and other materials on the scaffolding.

⒒ Vertical and horizontal horizontal braces, diagonal braces, etc. shall not be placed on door, window frames and scaffolding. The diagonal braces, tie rods, etc. in the middle of the channel should be set at a height of more than 1.80m.

⒓If there is a need to stop in the middle of the formwork, the supports, headers, column cap sealing plates, etc. should be nailed firmly to prevent accidents caused by falling due to supporting or stepping into the air.

⒔Use portal frames, steel pipes and other supporting formwork to support the use, and set level and scissor supports as required.

⒕If there are holes left in the template, the holes should be covered after installation. The remaining holes in the concrete slab should be covered after removing the formwork.

⒖Removal of formwork should be approved by the construction technician. The operation should be carried out in sequence and in sections. It is strictly forbidden to pry, smash or pry off or pull down large areas. Loose or hanging formwork should not be left before stopping the work.

⒗ When dismantling the formwork in dangerous areas such as cornices and balconies, there should be shelves, safety nets or safety belts underneath, and try to ensure that the formwork does not fall on the shelves or safety nets, and a small amount falls on the shelves or safety nets. Templates on the security network should be cleaned up in time.

⒘Before removing the formwork, fences or warning signs should be set up around it. Important passages should be guarded by dedicated personnel and no one should be allowed to enter.

⒙The order of formwork removal should be from top to bottom, from the inside to the outside. First remove the horizontal and diagonal supports of the supports, and then remove the formwork supports. The beams should first remove the side formwork and then the bottom formwork. Remove the formwork. People should stand to one side and not underneath the formwork. When several people are removing the formwork at the same time, they should pay attention to a safe distance between each other to ensure safe operation.

⒚When dismantling thin web beams, crane beams, trusses and other prefabricated component formwork, support should be added as they are dismantled to prevent the components from collapsing.

⒛The removed formwork should be promptly transported to a designated location for centralized stacking or cleaning and stacking to prevent nails from piercing feet and injuring people.

3. Woodworking machinery:

⒈Circular saw:

⑴The operating platform must be stable, the saw blade must not have continuous missing teeth or too many missing teeth, and the screw cap To tighten. The circular saw should have a protective cover, and a reverse switch should not be used. An inching switch should be used.

⑵ The operator should stand on one side of the saw blade. It is prohibited to stand in the same straight line as the saw blade. The operator must not operate across the saw blade.

⑶ The feeding material must be close to the backing, and no excessive force is allowed. When encountering hard joints, push slowly. When receiving the material, wait until the material comes out of the saw blade 375px, and do not pull hard by hand.

⑷When processing old materials, nails, cement slurry, mud, sand, etc. must be removed first.

⑸When sawing short materials, use a push stick and use a planer hook to join the materials. Do not cut wood that exceeds the radius of the circular saw.

⑹Do not touch the saw blade with your hands before it stops, and do not force the saw blade to stop by pushing the wood hard.

⑺The motor shell and the iron shell of the switch should be protected by zero connection or grounding, and a leakage protection switch must be installed.

⒉Hand electric drill:

⑴ Before use, check whether the power insulation is in good condition and whether it is damaged. The wires must be overhead. Wear insulating gloves when operating and install leakage protection when using them. switch.

⑵ Use the electric hand drill correctly according to the regulations on the nameplate. If you find leakage, excessive motor temperature, sudden slowdown or abnormal noise, you should stop using it immediately and have it repaired by an electrician.

⑶ When working at high altitudes, scaffolding should be set up, and safety belts should be hung when working in dangerous places. Pay attention to the front, back, left, and right operating conditions during work to prevent accidents.

⑷ When drilling upwards, you can only support the drill handle with your hands or a pole, and do not carry it with your head or shoulders.

⑸ When the electric drill is rotating, only use the drill handle to align the hole position, and it is prohibited to hold the drill bit by hand to align the hole.

⑹ After the work is completed, the power supply should be cut off and the wires should be put away for reuse.

Safety technical explanation of on-site steel bar installation

⒈For manual material cutting on site, the tools used must be strong, the chisel and hammer should be standing at an angle, and pay attention to people in the hammer throwing area and objects. Cut short steel bars smaller than 750px and clamp them firmly with pliers. It is prohibited to hold them with your hands, and a protective box should be installed on the outside to cover or face the uninhabited area.

⒉ When multiple people are transporting steel bars together, the lifting, lowering, rotating and stopping movements must be consistent, and manual up and down transmission must not be in the same straight line. The stacking of steel bars should be dispersed and stable to prevent tipping and collapse.

⒊When tying steel bars and installing frames at high altitudes and in deep pits, scaffolding and horse trails must be erected.

⒋Tie up the columns and wall steel bars, and do not stand on the steel frame or climb up or down the frame. The column reinforcement is within 4m and is not heavy. It can be tied on the ground or floor and erected as a whole. If the column reinforcement is above 4m, a workbench should be set up. The column and beam skeleton should be tightened with temporary supports to prevent toppling.

⒌When tying the foundation steel bars, steel brackets or horse stools should be placed to erect the upper steel bars according to the construction design regulations, and brackets or horse stools should not be reduced arbitrarily.

⒍External frames or safety nets should be set up to tie the steel bars of ring beams, overhangs, exterior walls, and side columns of high-rise buildings. Hang up the safety belt when tying.

⒎When lifting the steel frame, no one is allowed to stand underneath. The frame must be lowered to less than 1m above the ground before approaching, and it must be well supported before unhooking.

⒏A hanging cage should be used for lifting short steel bars, and a cross arm should be added for lifting extra-long steel bars. A wire rope jack should be used for bundling steel bars, and double binding should be carried out. It is prohibited to use a single jack or rope for hanging.

⒐ When lifting and tying steel bars on floors, be careful not to approach or collide with wires. And pay attention to the safe distance from naked wires (less than 1kv ≥ 4m, 1-10kv ≥ 6m).

⒑ There should be sufficient lighting for nighttime construction. Lamps are not allowed to be hung on erected steel bars or other metal components. The wires should be overhead.

Bamboo scaffolding erection safety technical briefing

1. General regulations:

⒈Material selection: use moso bamboo that has grown for more than four years, and is green, tender, yellow, and insect-eaten , rotten, cracked (more than two exposed joints) shall not be used.

⒉ Binding: Use water onion bamboo strips and Guangzhou strips. Do not tie three strings to one button.

⒊Moso bamboo diameter: The effective diameter of the small heads of vertical poles, large horizontal poles, scissor braces, throw braces and top braces should be ≥175px. Cross arm (small cross bar) ≥225px.

⒋The height of the shelf should be within 24m. If the height is above 24m, a design plan and approval should be prepared.

⒌The uniform load on masonry scaffolding shall not exceed 270kg/m2, and the uniform load on decorative scaffolding shall not exceed 200kg/m2.

2. Vertical poles:

⒈Setout: The foundation within the scaffolding erection range must be leveled and compacted.

⑴ According to the construction worker’s explanation and the characteristics of the building, determine the vertical and horizontal spacing of the poles, pull the wires on site, and nail bamboo sticks for setting out.

⑵ Determine the step distance of the shelf (should be ≤ 1.8) and the height of the first skin shelf according to the total height and characteristics of the building and construction requirements.

⒉ The burial depth is 30 to 1250px, with an anvil stone underneath. When the soil is soft or it is difficult to dig a hole, a sweeping pole should be tied.

⒊Lateral spacing: 1~1.2m, the vertical pole is ≤500px from the wall.

⒋Longitudinal spacing: 1.3~1.5m (error ±125px). The spacing between the poles of shelves exceeding 15m high shall not be greater than 1.5m. The external vertical pole should be 1.2~1.5m higher than the roof.

⒌Verticality: ≤250px at the corners, ≤375px in the middle of the shelf.

⒍The overlapping length of vertical poles: not less than 1.8m, and the joints must span a leather frame. Adjacent vertical poles must be staggered from each other in the same frame and must not overlap with the top support.

⒎The vertical pole lap joint should be on the right side of the top support, alternately, and maintain the verticality of the top support in the middle.

3. Small crossbar:

The inner end extends 15~875px from the inner pole, 5~250px from the wall, and the outer end extends more than 500px from the outer pole.

4. Top support:

The top support should be vertical, with the big end facing up, and three strips of bamboo strips tied to the vertical pole, and the diameter of the small end should be greater than three-thirds of the diameter of the small vertical pole. 2. The upper and lower supports should be kept in the same straight line.

5. Large horizontal poles:

Set four (width within 1.2m), tie them to the inside of the vertical pole, and place the joints at the vertical pole (place them on the small horizontal poles) pole), and be tied firmly. The joints of the upper and lower shelves should be staggered from each other, the overlap length should be no less than 1.5m, and the number of lashing lanes should not be less than four.

6. Scissor braces:

At the corners of the scaffold, at both ends and in the middle, they are set up continuously from bottom to top every 15m in the double span. The scissor brace should be slightly tied at the head, with the big head pressed against the small head. The overlap length should be greater than 37.5px, and there should be no less than 5 ties, and the angle should be 45° to 30° with the ground. The bottom should be buried more than 750px in the upper middle. When it cannot be buried in the ground, it should be firmly tied with no less than 16# lead wire at the intersection of the vertical poles.

Longitudinal continuous multi-span scissor braces can also be set up as needed, but their maximum width shall not exceed 6 spans.

7. Setting of wall-connecting points and throw supports:

For shelves with a height of three steps or less, a throw support should be set up every 6 to 7 vertical poles and buried 750px underground. For shelves with more than three steps, a wall point will be set up every two steps and four spans. The common method is to bury double strands of 10 to 12# galvanized lead wire (or steel ring) in the wall to pull the inner vertical pole of the shelf, and at the same time use a short piece of wood to prop up the wall (a small horizontal pole can also be used to prop up the wall and paint sawed off later). The wall connection point should be as close as possible to the node of the shelf pole to enhance the stability of the shelf.

8. Railings:

A 1.0m-high protective railing and vertical net must be installed on the inside of the outer pole for more than two steps. The outer pole must be 1.2 to 1.5m higher than the roof protective railing. Tied two ways.

9. Scaffolding boards:

The construction layer should be covered with scaffolding boards, and the four corners and large horizontal bars should be tied firmly with 16# lead wire. More than three steps of scaffolding boards should be paved up and down each construction operation layer, and the four corners and large crossbars should be tied firmly with 16# lead wire. High-rise racks should be covered with one leather rack plate every four racks for safety protection. Scaffolding boards must be laid tightly and firmly. The overlap length of the scaffolding boards shall not be less than 500px.

Gap more than 500px from the wall should be protected. One method of protection is to use shelf boards, and the other method is to use small safety nets for protection.

10. Ramp:

For ramps with more than three steps, ramps and platforms must be built, with a slope of ≤1:3

⒈Pedestrian ramps are generally the same as the ramps Width.

⒉The width of the material transport chute shall not be less than 1.5m, and the slope should be 1:6. The width of the turning platform shall not be less than 1.5m, and the area shall not be less than 6m2.

⒊1m high protective railings and vertical netting should be installed on both sides of the ramp and outside the turning platform.

⒋Erection method: Same as scaffolding, but for the stability of the ramp, scissor braces should be installed around the periphery and ends of both sides of the ramp. For ramps attached to the outside of the scaffold (that is, when using the external poles outside the scaffold as the internal poles of the ramp), the setting of the scaffolding wall poles should be strengthened. For independent ramps, connecting wall rods should be encrypted.

⒌ Bamboo frames that are not accessible to people on the roof should be equipped with a ramp to go up to the roof.

11. Binding:

All intersections of poles should be tied securely with bamboo strips.

12. Street protection:

The outside of the scaffolding along the street or in densely populated areas should be fully enclosed with protective bamboo fences, or fully enclosed with vertical nets. If conditions permit, it can be On the basis of the fully enclosed vertical net, bamboo fences are used on the outside of the scaffolding to strengthen the protection of the street surface.

13. Acceptance:

After the installation is completed or before use, the acceptance and handover procedures must be completed before use.

Mantang scaffolding erection safety technical briefing

The materials used and erection methods of Mantang scaffolding are the same as those of ordinary scaffolding.

⒈Pole: The distance between vertical and horizontal poles is ≯2m, and the step distance is ≯1.8m. The ground should be leveled and compacted, and the poles should be buried 30 to 1250px in the ground. When it cannot be buried in the ground, sleepers should be placed under the poles. And add a sweeping pole.

⒉Horizontal bars: The step distance between vertical and horizontal horizontal tie rods is ≯1.8m, and the distance between large crossbars on the operating floor is ≯1000px.

⒊Scissor braces: Angle-holding diagonal braces should be set up at the four corners, scissor braces should be set up on the four sides, and a scissor brace should be set up along the longitudinal direction every fourth row of vertical poles in the middle. Both diagonal braces and scissor braces should be continuous from bottom to top. set up.

⒋Laying of shelf boards: The shelf height is within 4m, the gap between shelf boards is ≯500px, and the shelf height is greater than 4m, the shelf boards must be fully laid.

Safety technical briefing on erection of loading platform

⒈The loading platform should be set up independently. The gap between the platform and the derrick should not exceed 250px. The width of the platform should be based on the principle of convenient loading and unloading of materials, and the length should be ≥ Outside of the hanging rail.

⒉Erection materials: Generally, fir or steel pipes are used for erection. When the load-bearing capacity is not large (within 300kg) and the height is not high, moso bamboo can also be used for erection (Hsinchu should be selected). The erection method is basically the same as Scaffolding is the same.

⒊Usage and structure: Mainly used as the incoming and outgoing material channel of the tic-tac-toe hanging basket, and generally do not stack materials.

The main rods include: vertical rods, horizontal rods, horizontal tie rods, scissor braces, railings, etc.

⒋Erection:

⑴The spacing between poles is within 1~1.5m, and the step distance is 1.5m~1.8m depending on the height of the building. The platform is based on the level of each floor. .

⑵ Set up vertical and horizontal horizontal tie rods every 1 to 1.5m high, which can be set at a height of 1.8m at the operation floor channel.

⑶ Cross bars: When the platform is laid with bamboo frame boards, the distance between the large cross bars should be within 1000px. When steel or wooden scaffolding boards are used, the distance between the large cross bars should not be greater than 1500px.

⑷Scissor supports: The outer vertical pole should be set continuously from bottom to top around the perimeter, and can be disconnected to leave a channel at the inlet and outlet.

⑸ Railings: 1~1.2m high protective railings should be set up around the platform as required. There is an openable safety door on the front.

⑹ Cable wind ropes: When the height of the platform exceeds 10m, cable wind ropes must be installed on all sides, or firmly fixed to the building, and shall not be fixed to the derrick.

Scaffolding removal safety technology Explanation

⒈ Before dismantling the scaffolding, team members must have a clear division of labor and unified command. They must concentrate during the operation and are not allowed to look around or joke around. Tools must be placed in tool bags when not in use.

⒉ Wear personal protective equipment correctly and wear soft-soled shoes. Wear safety belts when dismantling dangerous parts such as overhangs.

⒊Before dismantling the scaffolding, fences or warning signs should be set up around it, and special personnel should be placed at the traffic thoroughfares to prohibit entry.

⒋Strictly abide by the dismantling sequence, from top to bottom, one step at a time, and the upper and lower floors are not allowed to work at the same time.

⒌When dismantling the large crossbars and scissor supports of the scaffolding, the middle buckle should be removed first, and then the buckles at both ends. The middle operator should move down the pole and do not throw it down.

⒍The dismantled scaffolding poles, scaffolding boards, steel pipes, fasteners and other materials should be passed in or hung down with ropes, and should not be thrown downward to avoid injury and unnecessary losses.

⒎It is best not to change people midway during the dismantling process. If it is necessary to change people, the dismantling situation should be clearly explained.

⒏It is best not to interrupt the demolition process. If it is necessary to interrupt, the demolition part should be clearly completed and checked to see if it will collapse. It can only be stopped after confirming that it is safe.

⒐After the scaffolding is dismantled, the scaffolding materials should be stacked in categories. The stacking location should be flat, with supporting pads underneath and good drainage. Steel is best placed indoors and should be covered when stacked outdoors. Use diesel to clean fasteners, bolts and other scattered small components, pack them into boxes, sort them and store them indoors for reuse.

⒑Bent and deformed steel components should be straightened, damaged ones should be repaired and painted in time for reuse, and those that cannot be repaired should be scrapped together.

11 Auxiliary facilities: 1m high protective railings should be set up around the loading channel, ramps or escalators should be set up for the upper and lower racks, and climbing up and down the scaffolding poles is not allowed.

12 Construction load: Generally not more than 100kg/m2. If it needs to bear a larger load, reinforcement measures should be taken or designed.

Safety net hanging safety technology briefing

The quality of the safety net must comply with the regulations of GB5725-35, that is, the overall dimensions are 1.8×6m and 4×6m, and the weight of each net It should be less than 15kg/piece and more than 8kg/piece. The safety net is divided into two types: flat net and vertical net. The mesh number of the vertical net should be more than 2000 mesh (10CMX10CM).

1. Flat net:

A safety net whose installation plane is not perpendicular to the horizontal plane and is mainly used to catch falling people and objects is called a flat net.

⒈The flat net must be able to withstand the impact of a simulated human-shaped sandbag weighing 100kg and with a base area of ??70,000px2. The net ropes, side ropes, and tethers will not break (the tendons are allowed to break), and the maximum extension is 10m at the impact height. The rate does not exceed 1.5m.

Before the old network is reused, a comprehensive inspection should be carried out according to GB5725-86, and a certificate of permission for use should be issued before it can be used.

⒉Appearance inspection of the net:

⑴The side length of the mesh shall not be greater than 250px, and the diameter of the side ropes, tethers, and ribs shall not be less than 2 times the net rope, and shall be Greater than 7mm.

⑵ The ribs must be arranged vertically and horizontally. The distance between two adjacent ribs is between 30 and 2500px. All ropes on the network must be firmly knotted into nodes. The ribs should extend 1.2m beyond the side ropes for convenience. Splicing and binding between nets and nets or nets and mold rods. (Or add additional lanyards for tying).

⑶The old network should be free of damage or other defects that affect the quality of use.

⒊Selection of net:

⑴Select the type of net according to the purpose of use, and select the width of the net according to the load height. Vertical nets cannot be used instead of flat nets, but flat nets can be used instead. Use the net.

⑵ When the net width is 3m, the extended width after hanging is about 2.5m. When the net width is 4m, the extended width after hanging is about 3m.

⒋Network installation:

⑴Before installation, the net, poles, crossbars, and anchor points must be inspected, and installation can only begin after confirmation.

⑵ A large horizontal bar should be tied to the inner and outer sides of the safety net. The inner cross bar should be tied to a pre-buried steel ring or another large horizontal bar should be tied to the inside of the wall (floor). The pole is tied to the large inner crossbar of the outer safety net, and the gap between the large crossbar and the wall (or floor) is ≤375px. The large crossbar outside the net should be equipped with a pole every 3m. The pole should maintain an angle of 45° with the ground. The landing point of the pole should be firmly fixed. If the floor cannot be fixed, a sweeping pole can be set up and the feet of several poles can be connected. Tie them together with the pillars.

⑶The safety net is based on the principle that it is easy to tie, firmly connected and easy to untie and will not fall apart after being stressed. When multiple safety nets are connected and used, adjacent parts should be close to each other or overlap.

⑷ When installing the flat net, it should not be too tight. It should be high on the outside and low on the inside (50m higher on the outside). When the load height of the net is within 5m, the net should extend beyond the width of the building by more than 2.5m and within 10m. The minimum width of the net extending out of the building is 3m.

⑸ When installing near power transmission lines, you must first obtain the consent of the relevant departments and take appropriate measures to prevent electric shock, otherwise the installation shall not be allowed.

⑹ The first safety net is usually hung on the second floor (3-4m height), and then another movable safety net is hung every 6-8m (GB5725-85 regulations). In addition to a fixed safety net on the second floor of a multi-story or high-rise building, another fixed safety net should be installed every fourth floor.

⑺The distance between the net and the surface of the object below it (or on the ground) shall not be less than 3m.

⑻ When hanging the safety net, it should be considered in advance that there should be a retractable movable safety net at the location where materials are temporarily required to be put in and out. When lifting materials, the net should be put away and restored to its original state immediately after use.

⒌Use, repair and maintenance:

⑴The safety net must be visually inspected once a week during use, and debris must be cleaned up in time.

⑵ After being impacted by a large load, the network should be replaced with a new one or inspected promptly to see if there is any serious deformation, wear, breakage, detachment of the connection parts, etc. Only after confirming that it is intact can it continue to be used.

⑶ According to the provisions of GB5725-85, the test rope strength test should be carried out every 3 months during use (or the test should be carried out according to the instructions).

⒍Cleaning of the safety net: To clean the safety net, before entering the safety net, you must first check the quality of the safety net, whether the support pole is firm, and confirm safety before entering the safety net for cleaning. When cleaning, you must Hold the netting with one hand and clean the debris with the other hand. It is forbidden for people to stand on the safety net and clean the debris or throw it down with both hands.

When clearing debris, a guardian should be set up on the ground to prohibit people from entering, or a fence should be added.

2. Vertical net:

The installation plane is perpendicular to the horizontal plane (relatively speaking), and the safety net mainly used to prevent people and objects from falling is called vertical net.

⒈According to the regulations of GB5725-85, the breaking strength of the side ropes and tethers of the vertical net shall not be less than 300kgf, the breaking strength of the net rope shall be 150-200kgf, and the side length of the mesh shall not be greater than 250px.

⒉The hanging net must be straightened and tightened.

⒊The maximum gap between the edge of the net plane and the surface supporting the operator shall not exceed 375px.

Technical explanation of electricity safety at construction sites

1. Electricity management:

⒈Temporary electricity must be used in accordance with the "Technical Specifications for Temporary Electricity Safety at Construction Sites" "JGJ46-88" prepares the electrical construction organization design and formulates technical measures for safe electricity use and electrical fire prevention measures.

⒉ Temporary electrical engineering drawings must be drawn by electrical engineering technicians alone, and shall be used as the basis for temporary construction after approval by the technical person in charge.

⒊Contents and steps of temporary power construction organization design:

⑴ On-site survey, determine the main distribution box (cabinet) of the power incoming line, the location and line of the distribution box towards.

⑵ Carry out load calculation and select wire cross-section and type and specification of electrical appliances.

⑶ Draw electrical plan, elevation and wiring system diagrams.

⑷ Develop technical measures for safe electricity use and electrical fire prevention measures.

⒋Technical files for temporary power use safety at the construction site:

⑴All information on temporary power use construction organization design and modified construction organization design.

⑵Technical information.

⑶ Temporary electrical engineering inspection and acceptance form.

⑷Ground resistance measurement record.

⑸Regular inspection (re)inspection form (once a month at the construction site and once a quarter by the company).

⑹ Electrician maintenance work records.

⒌The installation, maintenance or dismantling of temporary electrical projects must be completed by electricians, and the electrician’s grade should be appropriate to the difficulty and technical complexity of the project.

2. Electricians:

1. Electricians must undergo professional and safety technical training, and pass the examination of the (prefecture) municipal labor department and be issued an operation certificate before they are allowed to operate independently.

⒉Electricians should master the basic knowledge of electrical safety and the performance of all equipment.

⒊Wear personal protective equipment as required before taking up work.

⒋Disabled equipment should be turned off and powered off, and the switch box should be locked.

⒌ Responsible for protecting the load line of electrical equipment, protecting the neutral line (repeated grounding) and the switch box.

⒍The power supply of mobile electrical equipment must be cut off. Under normal circumstances, live work is not allowed, and a guardian must be installed for live work.

⒎ Conduct regular inspections of power lines as required (monthly at the construction site and quarterly at the company), deal with problems found in a timely manner, and keep inspection and maintenance records.

⒏You should know the common sense of first aid for electric shock and the common sense of electrical fire extinguishing.

3. Safety distance and external power protection:

External power lines: refers to any power lines other than temporary power lines at the construction site.

⒈Construction, erection of temporary facilities or stacking of objects, racks, materials and other debris below high and low voltage lines are prohibited.

⒉Safety distance:

⑴The minimum safe distance between the outside of the project under construction (including scaffolding) and the overhead lines is not less than 4m for 1kv, not less than 6m for 1~10kv, 35 ~110kv is not less than 8m. The minimum distance between the maximum sag of overhead conductors and the ground at the construction site is ≥4.0m and the motorway is ≥6.0m.

⑵ The horizontal distance between the edge of the boom or the hoisted object and the 10kV overhead line is ≥ 2m.

⑶The minimum distance between a motor vehicle lane and an external power overhead line is 6m below 1kv, and 7m below 10kv.

⒊External electricity protection:

⑴If the safety distance requirements are not met, protective measures must be taken, and barriers, barriers, fences or protective nets must be added, and eye-catching warning signs must be hung.

⑵ The safe distance from the live body to the fence (10kv) should be greater than 2375px, and the 35kv should be greater than 2875px.

⑶ The safe distance from the live body to the fence (closed) at 10kv should be greater than 750px, 35kv Should be larger than 1250px.