1. Project Overview
The "three connections and one leveling" work at the construction site has been basically completed, and the outer ground has been hardened.
2. Design basis and structural requirements
1. This calculation is based on the "Practical Manual of Construction Scaffolding" by China Architectural Press; Exceeding the design load is allowed.
3. Small horizontal bars, large horizontal bars and vertical bars are the main components that transmit vertical loads. The shear braces, diagonal braces and connecting wall parts mainly ensure the overall stiffness and stability of the scaffolding. and enhanced resistance to vertical and horizontal effects. The connecting wall members bear all the wind load. Fasteners are the connecting parts and force transmission parts that make up the whole frame.
4. Erection requirements:
(1) A 24m double-row steel pipe scaffolding shall be erected along the stairwell exterior wall line;
(2) A 21.5m double row shall be erected for the rest. Arrange steel pipe scaffolding.
5. Use this plan to take the maximum erection height of 24m for verification;
6. Use Φ48×3.5mm double-row steel pipe scaffolding to erect, the horizontal distance of the vertical poles is b=1.0m, and the main The longitudinal distance of the poles is l=1.5m, and the distance between the inner poles and the wall is 0.2m. The step distance of the scaffolding is h=1.8m. The scaffolding boards are set up every 1.8m starting from 2.0m on the ground (full paving), up to 11 floors, scaffolding and construction For the location of the connection points of the main structure of the object, the vertical spacing is H1=2h=2×1.8=3.6m, and the horizontal spacing is L1=3L=3×1.5=4.5m. According to regulations, uniform load Qk=2.0KN/㎡.
3. Materials used
1. The steel pipe should be made of Q235A (No. 3) steel with moderate mechanical properties, and its mechanical properties should comply with the current national standard "Carbon Structural Steel" (GB700- 89) Provisions for Q235A steel. Each batch of steel entering the site should have a material inspection certificate.
2. The steel pipe is a welded steel pipe with an outer diameter of 48mm and a wall thickness of 3.5mm. The maximum length of vertical poles, large horizontal poles and diagonal poles is 6.5m, and the length of small horizontal poles is 1.5m.
3. According to the regulations of "Classification and Technical Conditions of Castable Iron" (GB978-67), fasteners are made of malleable cast iron with mechanical properties not less than KTH330-08. Castings should not have cracks, pores, shrinkage porosity, blisters, residual cracks at the pouring and riser, and remove burrs, scale, etc.
4. The fitting surface between the fastener and the steel pipe must be strictly shaped to ensure good contact with the steel pipe when fastening. When the fastener clamps the steel pipe, the minimum distance between the openings should be no less than 5mm.
5. The active part of the fastener should be able to rotate flexibly, and the gap between the two rotating surfaces of the rotating fastener should be less than 1mm.
6. The surface of fasteners should be treated with anti-rust treatment.
7. The scaffolding board should be made of fir, with a thickness of not less than 50mm, a width of 200mm or more, and a length of 4-6m. Its material should comply with the current national standard "Regulations on Design of Wooden Structures" (GBJ5-88) The requirements for Class II wood in China are that there must be no cracking or decay. The two ends of the scaffolding board should be equipped with two hoops of galvanized steel wire with a diameter of 4mm.
8. Steel pipes and fasteners reporting standards: Steel pipes are bent, flattened, cracked or severely corroded; fasteners that are brittle, deformed or slippery should be scrapped and prohibited from use.
9. The outer frame steel pipe is made of golden yellow, the railings are made of red and white, and the fasteners are painted with dark red anti-rust paint.
IV. Calculation of scaffolding
(1) Basic conditions: The ground rough construction is Category C, the basic wind pressure W0=0.45KN/㎡, and the vertical mesh size is 3.5cm ×3.5cm, rope diameter 3.2mm, dead weight 0.01KN/㎡.
(2) The erection height calculation and verification part should be determined based on the analysis and analysis of the bending compressive stress generated by the wind load. Therefore, the pressure generated by the wind load should be calculated first as σw
1. σw calculation vertical The net-enclosed wind-shielding coefficient and wind load type coefficient "Building Structural Load Code" are approximately calculated according to the following method
ξ= (3.5+3.5)×0.32/(3.5×3.5)×1.05=0.1921.05
To consider the influence of tendons
μS=1.2×0.192=0.23
Calculation of the standard value (4-4) of the wind load transmitted from the vertical net to the column , calculate the wind pressure height coefficient μZ according to the value of category C in Table 4-19. When H=24m, μz=1.25. When H=5m, μz=0.54. The maximum erection height of this design is 24m, so u2=1.25 .WK=0.7μzμSW0 where μ2—wind pressure height coefficient μS—scaffold wind load type coefficient W0—basic wind pressure
WK=0.7×1.25×0.23×0.45=0.09KN/㎡
< p>Standard value of wind load acting on columns: qWK=WK·L=0.09×1.8=0.162KN/mThe bending moment generated by wind load is calculated according to Equation 4-33 MW=1.4qWK· In h2/10, qWK; standard value of wind line load WK; standard value of wind load perpendicular to the surface of the scaffolding L; column spacing of the scaffolding W; the resisting moment of the column section adopts σW according to Table 4-31; the wind load on the calculated column The bending compressive stress generated by the wind load on the column section at a height of 24m is: σW=MW/W = (0.073×106)/(5.08×103)=14.37N/m㎡
The bending pressure caused by the wind load on the column section at a height of 5m is: σW=14.37×(0.54/1.25)=6.21N /m㎡
2. The axial pressure of the bottom column section, the self-weight of the scaffolding structure, the axial pressure of the scaffolding board and the construction load
(1), the axial pressure caused by the self-weight of the scaffolding structure The pressure NGK is found from Table 4-38. The standard value of the axial center pressure generated by the scaffolding structure per meter within a column distance range is gk=0.134KN/m. Then the standard value of the axial center pressure generated by the self-weight of the 21m high scaffolding structure is NGK=H·gk 24 , ***Level 11.
Then NQ1K=0.5 (lb+0.3)·l·∑Qp=0.5 (1+0.3)×1.5×0.3×11=3.2KN The protective material of the open scaffold produces axial pressure lookup table 4-40 (L=1.5m) 0.228KN
The weight of the vertical net is 0.01×1.5×24=0.36KN∴NQ2K=0.228+0.36=0.588KN. The two floors are operated at the same time, and the construction load is uniformly distributed QK2 .03KN/㎡ Look up Table 4-41 and find that the axial pressure generated by the construction load is: NQ3K=4.86KN. According to the formula (4-32), the standard value of the axial pressure generated by the live load is NQiK=NQ1K+NQ2K+NQ3K=3.2+0.588+ 4.86=8.65KN
(3) Calculate the axial pressure value of the vertical pole section: Calculate N=NGK×1.2/K1+NQiKK1-height adjustment coefficient according to formula (4-31), which should be according to the table ( 4-35 adopted)
K1=0.85N=3.21×1.2/0.85+1.4×8.65=16.6KN3. Column stability check When the vertical net is closed, the column stability should satisfy the following formula: N/ψA+ MW/W≤fc or N≤ψA (fc-σW)
φ; the stability coefficient of the axial pressure rod can be obtained from Table 4-37 according to the calculated ratio of column segments λ=μh/I I; The radius of gyration of the column section should be checked according to Table 4-31 i=1.58cmμ; the length coefficient should be calculated according to Table 4-36 using M=1.5h; the calculated scaffolding step distance of the column section h=1.8m ∴λ=μh/i=1.5×1.8/1.58×10-2=170.8 According to Table 4-37: φ=0.225A—column cross-sectional area, which should be adopted according to Table 4-31, A=4.89c㎡, fc= 205N/m㎡ψA (fc-σW)
=0.225×4.89×102 (205-14.37)×10-3=20.97KN>N=16.63KN (satisfied)
4. The maximum allowable erection height φAfcw=0.225×4.89×102 (205-14.37)=20.97KNHd=K·[(φAfcw-1.4NQiK)/1.2gK]=0.85×[(20.97-1.4×8.65)/(1.2× 0.134)]=47m5. The conclusion meets the installation requirements.
(4) Calculation of connecting wall parts. The connecting rods of the building occupied by scaffolding should be calculated according to the axial compression rods NH≦φAfc. In the formula: NH—the design value of the horizontal force on the connecting wall parts NH= HW+3.0KNHW=design value of horizontal force generated by wind load HW=1.4WK·AWAW; windward area is equal to the product of straight and vertical and horizontal spacing of connecting wall parts; φ; axis compression stability coefficient, according to λH=LH /i is adopted according to Table 4-37; LH; the calculated length of the wall connecting piece should be taken as the distance between the fixed connection points at both ends of the connecting piece LH=0.2λH=0.2×1000/1.58×10=126.5mmφ=0.417∴φAfc=102 ×0.417×4.89×20.5=41.8KN∴NH=1.4WK·AW+3.0=1.4×0.106×3.6×4.5+3.0=5.4∴NH≤φAfc (satisfied)
(5) Column foundation Calculation of bearing capacity The bearing capacity of column foundations should be calculated as follows: P=N/Ab≤fP—the average pressure design value at the bottom of the column foundation.
N-The design value of the axial force transmitted from the superstructure to the top surface of the foundation.
Ab-Basic base area.
f - Design value of foundation bearing capacity, f=Kb·fKfk - Standard value of foundation bearing capacity Kb - Adjustment coefficient of foundation bearing capacity, P=16.6/(1.5×0.9) should be adopted according to Table 4-47 =11.9KN/㎡The basic value of plain soil bearing capacity is fO=120KN/㎡>P (satisfied)
V. Erection technical measures
1. External frame erection
(1) The vertical deviation of the pole shall not be greater than 1/200 of the elevated height.
(2) Except for the lap joints on the top layer of the vertical pole joints, the other joints must adopt butt fasteners. The butt joints should meet the following requirements: the butt fasteners on the vertical poles should be arranged in a staggered manner, with two phases. The joints of adjacent vertical poles should not be located in the same span at the same time. The staggered distance between two adjacent vertical pole joints in the height direction should not be less than 500mm. The distance between the center of each joint and the main node should not be greater than 1/3 of the step distance. In the same step No two connectors are allowed inside.
(3) The top of the pole should be 1.5m higher than the roof of the building.
(4) Vertical and horizontal sweeping poles must be installed at the bottom of the scaffolding. The vertical sweeping rod should be fixed with right-angle fasteners on the vertical pole no more than 200mm away from the surface of the pad iron block, and the horizontal sweeping rod should be fixed with right-angle fasteners on the vertical pole immediately below the longitudinal sweeping rod.
(5) The large horizontal bar is placed under the small horizontal bar. On the inside of the vertical pole, right-angle fasteners are used to fasten the vertical pole. The length of the large horizontal bar should not be less than 3 spans and not less than 6m. (6) The connection and docking of large crossbar butt fasteners should meet the following requirements: Butt joints should be arranged in a staggered manner and should not be located in the same span or at the same time. The horizontal distance between adjacent joints should not be less than 500mm. And should avoid being located in the middle of a vertical horizontal span.
(7) The longitudinal horizontal height difference of the large horizontal bars around the shelf shall not exceed 500mm, and the horizontal deviation of the large horizontal bars in the same row shall not be greater than 1/300.
(8) Both ends of the small crossbar should be fixed on the vertical pole using right-angle fasteners.
(9) A small horizontal bar must be set up at each main node (i.e., the intersection of the vertical pole and the large horizontal bar) and fastened to the large horizontal bar using right-angle fasteners. The axis of the rod deviates from the The distance between the main nodes should not be greater than 150mm, the extension length on the wall side should not be greater than 250mm, and the extension length of the outer frame facade should be 100mm. The transverse horizontal bars at non-main nodes on the operation layer should be set at equal intervals according to the needs of supporting the scaffolding boards. The maximum spacing should not be greater than 1/2 of the vertical bar spacing. The minimum spacing between horizontal bars on the construction layer is 1m.
(10) The scaffolding board should generally be set on more than three small crossbars. When the length of the scaffolding board is less than 2m, two small crossbars can be used, and both ends of the scaffolding board should be reliably fixed to prevent tipping. The scaffolding boards should be laid flat and firmly. The distance between the wall side and the wall should not be greater than 150mm. The corners should be circled and there should be no probe boards.
(11) During erection, every other outer frame must be firmly tied to the structure in time to ensure safety during the erection process. The verticality and horizontal deviation of the rods must be corrected as needed, and the Tighten the fasteners.
(12) The tie rod must be connected to the window from the first floor. The end of the tie rod connected to the scaffolding can be slightly inclined downwards and is not allowed to tilt upward. Ensure vertical 4m and horizontal 6m pull connection.
(13) A scissor brace is provided at each end of the facade of the scaffolding, and is set up continuously from bottom to top; the clear distance between each scissor brace in the middle should not be greater than 15m.
(14) Except for the top layer of the scissor brace, which can be overlapped, all other joints must be connected with butt fasteners.
(15) The scissor brace should be fixed with rotating fasteners on the extended end of the small horizontal bar or vertical pole that intersects with it. The distance between the center line of the rotating fastener and the main node should not be greater than 150mm.
(16) The opening of the fastener used for the docking of large horizontal bars should be facing the inside of the shelf, with the bolt upward. Avoid opening upward to prevent rainwater from entering, which will cause corrosion of the fastener and weaken the strength after corrosion. , the right-angle fasteners must not face upward.
(17) The construction layer of the outer frame should be covered with scaffolding boards. There should be a protective railing and a toe guard on the outside of the scaffolding. The height of the railing epithelium should be 1.2m and the height of the toe guard should not be less than 180mm. A safety net is hung vertically on the railing, and the lower opening of the net is tightly sealed with the building (that is, forming a pocket net) or the bottom of the vertical net is pressed under the scaffolding board on the working surface, and then a fixed safety net is set up under the scaffolding board on the operating floor.
(18) Scissor braces are double poles that cross each other in a cross shape on the outside of the scaffold. And form an angle of 45° to 60° with the ground. Its function is to connect the scaffolding into a whole and increase the overall stability of the scaffolding.
2. Processing of passing through the door opening. When passing through the door opening, the double-row scaffolding can lift 1.2 vertical poles, that is, disconnect at the large horizontal pole in the first step. Use diagonal rods to support the suspended vertical poles, and connect large horizontal rods with more than three steps one by one so that the load is distributed on the vertical poles on both sides. The angle between the lower end of the diagonal rod and the ground should be about 60°. The intersections with vertical poles and large horizontal poles should be buckled.
3. Dealing with window openings. When a single row of scaffolding encounters a window opening, a pole can be added or a short and large crossbar can be hoisted to transfer the load to the small crossbars on both sides. If the window opening is wider than 1.5m, , poles (with pads at the bottom) and large crossbars should be added indoors to bear the load from the small crossbars.
6. Foundation treatment
1. Make an 80mm thick C10 concrete floor for the foundation to ensure that the foundation does not deform;
2. The vertical pole is supported at 20× 20×0.8 steel plate;
3. The site is flat and there should be no accumulation of water.
7. Erection process and erection drawings
1. Shelf erection process: stretch the line on a solid foundation and position the pole → place the sweeping pole → erect the pole and combine it with the sweeping Fasten the rod → install the small sweeping bar and fasten it with the vertical pole and sweeping rod → install the first step large cross bar and fasten it with each vertical pole → install the first step small cross bar → install the second step large cross bar →Install the small crossbar in the second step →Add a temporary diagonal brace, and fasten the upper end to the large crossbar in the second step (remove it after installing the connecting rod with the column) →Install the large and small crossbars in the third and fourth steps →Install the second floor and column tie rods →Connect the vertical poles →Add shear braces →Lay scaffolding boards, tie protection and footboards, and vertically hang safety nets.
2. The tie between the frame and the building (flexible tie)
Uses components composed of Φ6 steel bars, top braces, steel pipes, etc. The steel bars bear the tension, and the pressure is from the top. Supports, steel pipes, etc. are transferred.
3. Safety net
(1) Hanging requirements: The safety net should be hung tightly and tied firmly with plastic slings without leaks. The connection between the two nets should be tied at on the same pole. The safety net should be hung on the inside of the scaffolding.
(2) A closed flat net should be set up between the scaffolding and the construction layer according to the acceptance standards to prevent debris from falling.
4. Safety baffles: Full baffles must be erected at passage entrances and open-air working sites near buildings. The passage entrance baffles must extend 1M to both sides and 3M outward.< /p>
5. Erection drawings
8. Acceptance, use and management of shelves
1. Acceptance, use and management of shelves
( 1) Check the acceptance check. During the erection process of the shelf, the height of each construction layer must be inspected by the project technical leader, organized by the technical, safety and erection team, and the foreman. Only when the requirements are met can it be used by people. If the shelf has not been inspected and accepted, other personnel except the shelf workers are strictly prohibited from climbing on it. No one is allowed to dismantle or modify a shelf that has passed the acceptance inspection. If partial disassembly and modification is required, it must be approved by the person in charge of the design and the work must be done by the shelf worker.
(2) The person in charge of the construction of the project must formulate written operation requirements according to the requirements of the shelf plan, and make safety technical briefings to the team. The team must strictly carry out the construction in accordance with the operational requirements and safety technical briefings.
(3) After the foundation, unloading measures and shelf segmentation are completed, the shelf plan and safety, technology, construction, use and other relevant personnel should be inspected by project and fill in the acceptance form. , you can continue to set up and use it after passing the test.
(4) The usage is considered based on 3kN/㎡, so batches of materials are not allowed to be stacked on the shelves, and sporadic materials can be stacked appropriately.
(5) In the first step of the outer frame (1.8m high), the pocket nets and vertical nets will be set up. After that, a pocket net will be set up every 4 steps, and the scaffolding boards of the construction layer and the construction layer edge will be set up. Pocket nets and vertical nets must be set up to ensure the safety of workers working at heights.
(6) After the shelf is set up, special personnel must be assigned to manage it. No changes are allowed without the consent of the safety department, and the tie rods and fasteners connecting the shelf and the column are not allowed to be arbitrarily removed.
(7) No moving materials are allowed on the shelves, such as fasteners, moving steel pipes, and steel bars. Once found, they should be removed in time.
(8) After rain, check the subsidence of the shelf. If you find that the foundation has settled or the pole is suspended, immediately use wooden boards to wedge the pole tightly.
(9) Scaffolding operations are not allowed in strong winds above Level 6, heavy fog, and heavy rain. Anti-slip measures must be taken before putting up the shelves after rain.
(10) The outer frame is fully enclosed with an external network. The external safety net should be leveled with the frame, the edges of the net should be fastened securely, and the joints between the two nets should be tight and not allowed to drift in the wind.
(11) The construction load on the working layer should comply with the design requirements and shall not be overloaded. Formwork, pumped concrete delivery pipes, etc. shall not be supported on the scaffolding, and any hanging lifting equipment is strictly prohibited.
2. Personnel quality requirements
(1) Personnel working at heights must be at least 18 years old, have visual acuity of not less than 1.0 in both eyes, have no color blindness, no hearing impairment, and no height Blood pressure, heart disease, epilepsy, dizziness, sudden syncope and other diseases, and no other diseases and physical defects that would hinder the work of climbing and erecting.
(2) Have a strong sense of responsibility, work seriously and responsibly, and be familiar with the safety technical operating procedures of this job. It is strictly prohibited to work under the influence of alcohol or to joke around during homework.
(3) Clearly use personal protective equipment and take safety protection measures. When entering the construction site, you must wear a safety helmet, wear a seat belt when working at a distance of more than 2 meters without reliable protection, and use tools in tool holsters.
(4) Operators must undergo training and education, pass examinations and physical examinations, and hold a certificate to work. No one may arrange for untrained and unlicensed personnel to work.
(5) Workers should undergo regular physical examinations (once a year).
(6) Materials used in operations must be stacked stably, and the ground environment for high-altitude operations must be clean and tidy. It must not be disorganized or placed randomly. All tools used must be counted and recycled to prevent them from being left on the job site and falling down to hurt people.
3. Requirements for labor protection supplies (three treasures)
(1) Safety helmets
1) Safety helmets must be supplied by manufacturers certified by the Ministry of Construction. The use of certified safety helmets is prohibited. The safety helmets used in the project will all be provided by the branch company, and subcontracting and outreach units are not allowed to purchase safety helmets privately.
2) The safety helmet must have properties such as impact resistance, lateral pressure resistance, insulation, and puncture resistance. It must be worn correctly during use. The safety helmet has a service life of 2.5 years.
(2) Safety belts
1) When purchasing safety belts, you must have qualified products approved by the Labor Protection Research Institute.
2) After 2 years of use, the seat belt must pass the random inspection according to the usage conditions before it can be used.
3) The safety belt should be hung high and used low (except for scaffolders). Pay attention to prevent swinging and collision. The rope is not allowed to be knotted, and the hook is not allowed to be hung directly on the safety rope. It should be hung on the connection When used on a ring, choose to hang it on a solid component.
4) Various components on the safety belt must not be removed at will. When updating the rope, be sure to add a rope cover.
(3) Safety net
1) The technical requirements of the safety net must comply with the regulations of CB5725-85 before it can be used in the site. The safety net used in the project must be supplied by manufacturers recognized by the company. The large-hole safety net is used as a flat net and a pocket net. Its specification is a green dense mesh safety net of 1.5m×6m, which is used as an internal hanging vertical net. The green dense-mesh safety net hung inside is supplied by a manufacturer with national certification, and the safety net must undergo a fire test before entering the site.
2) When the safety net is stored and used, it must not be contaminated by organic chemicals or mixed with other items that may cause wear. When contamination is found, it should be washed and dried naturally after washing. Electric welding should be prevented during use. Sparks fell on the net.
3) After the safety net is removed, it must be washed and tied up, and placed in a ventilated, light-shielded, and heat-insulated place. It is prohibited to use hooks to transport it.
9. Technical briefing on the safety of shelf erection
1. Technical briefing on safety of shelf erection
(1) All patients with high blood pressure, heart disease, epilepsy, and dizziness Personnel who are not suitable for working at heights due to poor eyesight or other factors are not allowed to engage in shelf work. Apprentices who are equipped with shelf workers must pass the physical examination of the medical department before training. They must be led and guided by technicians during operations, from low to high, and gradually increase. They are not allowed to operate alone on the shelves at will. Safety technical education should be carried out frequently. Anyone engaged in shelf work must undergo regular (annual) physical examinations.
(2) Before erecting the scaffolding, a construction plan must be formulated and safety technical briefings must be conducted. For tall and odd-shaped shelves, the approval of the superior department should be submitted, and a written explanation should be given to all personnel participating in the operation.
(3) After accepting the task, the operation team must conduct careful discussions based on the characteristics of the task and the disclosure requirements, determine the support method, and clarify the division of labor. Before starting the operation, the team leader and safety officer should check the construction environment and the required protective equipment, and eliminate hidden dangers before starting the operation.
(4) When erecting workers work at high places (more than 2m above the ground), they must wear safety belts. The pole used should be tied with a 2m long pole rope.
The seat belt must be hung securely on the vertical and horizontal poles that have been tied up. It must not be hung on lead wire buckles or other unstable places. It must not be "walked through the gears" (that is, walk on a down-stream pole without any fulcrum), nor must it be hung on any fulcrum. Jumping frame. When operating on the shelf, you should concentrate on it. Playing and joking are prohibited. You should get off the shelf when taking a break. It is strictly prohibited to work after drinking.
(5) Work at heights should be stopped when severe weather (such as wind force above Level 5, high temperature, rainy weather, etc.) affects safe construction.
(6) The large crossbar should be tied inside the vertical pole. When tying the first large horizontal bar, you must check whether the vertical pole is upright. When tying the fourth step, you must tie temporary small horizontal bars and temporary crosses. build. When tying large crossbars, 2-3 people must cooperate. The middle person must tie the bar, lay it flat, and tie it in order.
(7) When passing or pulling the rod, the upper, lower, left and right operators should cooperate closely and coordinate. The person pulling the pole should be careful not to collide with the person above or the tied pole. The person handing the pole below should not let go until the person above catches the pole, and stay away from the vertical operating distance of 3m. When manual lifting is used, the rope must be strong and it is strictly prohibited to pull the rope within 3m vertically to lift the material. When mechanical lifting is used, the sky and earth wheels should be installed and the sky and earth wheels must be reinforced. The safe operating procedures for mechanical lifting should be followed. Lifting fir boards, steel pipes and other objects should be tied firmly. No one is allowed to stand outside the material receiving platform. Personnel receiving materials should wait. Stop the heavy machinery before receiving materials and untying the rope.
(8) Non-scaffolders are not allowed to put up any unfinished scaffolding. After the rack is erected, the constructor, together with the rack team leader and relevant personnel such as the type of work, technology, and safety, will conduct inspection and acceptance. If the rack is found to be qualified, it can only be used after completing the handover and acceptance procedures. The scaffolding in use must be kept intact. It is prohibited to dismantle or modify the scaffolding or misappropriate the scaffolding boards at will. When it is necessary to dismantle or modify the scaffolding, it must be approved by the person in charge of the construction, and the scaffolder is responsible for the operation.
(9) All shelves must be inspected after strong winds and heavy rains. If they are found to be tilting, sinking, loose or collapsed, they must be repaired in time.
2. Safety technical disclosure for shelf dismantling
(1) Before the outer frame is dismantled, the foreman must make a written safety disclosure to the dismantling construction personnel. The disclosure must be signed by the recipient.
(2) Before dismantling, the team must learn the safety technical operating procedures. The team must make a safety briefing to the dismantling personnel. The briefing must be recorded, the content of the briefing must be targeted, and the precautions for dismantling the shelf must be explained. clear.
(3) Before dismantling the frame, use ropes or wires to pull up the fence on the ground. The outer frame is not allowed to be dismantled without a guardian or safety officer present.
(4) The shelf removal procedure should be from top to bottom, layer by layer and step by step. First clear the debris on the shelf, such as concrete, mortar blocks, U-shaped cards, movable poles and materials on the scaffolding board. According to the principle of disassembly, the pole is disassembled first and then erected. The scissor supports and tie rods are not allowed to be dismantled all at once. It is required to remove the rods to which level, and the scissor supports and tie rods to which level.
(5) Dismantling process: remove the guardrail → remove the scaffolding → remove the small crossbar → remove the large crossbar → remove the scissor brace → remove the vertical pole → transfer the tie rod to the ground → clear the fasteners → according to specifications Stacking.
(6) When dismantling and placing the rod, 2 or 3 people must work together. When dismantling a large horizontal rod, the person standing in the middle should pass the rod down, and the person below will receive the rod and take it. The person above is only allowed to let go after holding it firmly, and it is strictly forbidden to throw scaffolding materials downwards.
(7) Dismantling personnel must wear seat belts. During the dismantling process, a worker with strong sense of responsibility and high technical level should be assigned as the commander and be responsible for all safe operations of the dismantling work.
(8) When dismantling the frame, do not cut it arbitrarily if there are pipeline obstructions. At the same time, pay attention to the collapse of the fasteners and avoid stepping on the sliding rods.
(9) When dismantling the frame, the turnbuckle must be removed from the steel pipe, and the turnbuckle is not allowed to be attached to the removed steel pipe.
(10) Dismantling personnel should be equipped with tool covers. When holding the steel pipe, they are not allowed to hold a wrench at the same time. Tools must be placed in the tool cover after use.
(11) It is not allowed to sit on the shelf or in an unsafe place when taking a rest. It is strictly forbidden to play and play while taking a break.
(12) Dismantling personnel must wear personal protective equipment. They are not allowed to wear rubber-soled slip-on shoes when working on shelves, and their clothes must be light.
(13) Personnel are not allowed to be replaced during the dismantling. If the personnel are replaced, a safety technical explanation must be made again.
(14) The dismantled scaffolding poles must be dismantled, cleaned and transported as needed. They must be classified, stacked and stacked according to specifications. Waterproof measures must be taken to prevent rust after rain. Fasteners should be packed and stored according to model.
(15) The dismantled steel pipes should be repainted with anti-rust paint and mixed paint regularly. The elbows should be straightened and the fasteners should be lubricated.
(16) It is strictly prohibited for shelf workers to perform shelf erection and disassembly work at night. For outstanding matters, the foreman will make detailed explanations in the safety technical briefing. If there are problems during the construction, he should contact the technical department in time for timely correction.
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