First, the construction preparation
1. material
The quality of semi-finished steel bars should meet the requirements of design drawings. The iron wire for steel binding is 20 ~ 22 # iron wire (galvanized iron wire).
Cement board: it should have a certain strength.
2. Tools
Commonly used lead wire hooks, small wrenches, sliding bars, bookbinding frames, folding rulers or tape measures, white chalk, special transportation equipment, etc.
3. Fuck oak parts
(1) Be familiar with the drawings, and check whether the grade, diameter, size and quantity of semi-finished steel bars are consistent with the bill of materials. If there are any mistakes and omissions, correct and supplement them in time.
(2) Prepare iron wire, cement board and common binding tools and machines.
(3) rebar positioning: draw the rebar installation position line. When there are many kinds of steel bars, the specifications, shapes and quantities of steel bars of various components shall be indicated on the installed formwork.
(4) When binding complex structural members, the order of shuttering and binding should be considered in advance, and the installation scheme should be made.
(5) Before installation, all sundries at the joint should be cleaned up.
Second, the operation process
1. basis.
(1) For the binding of steel mesh (screen bottom), the intersection of two rows of steel bars around should be fastened at every point, and the middle part should be fastened at every five o'clock. All steel bars of two-way main reinforcement must be fastened at the intersection of each other. Pay attention to the eight-character binding of wire buckles at adjacent binding points (left and right buckle binding).
(2) When the foundation slab adopts double-layer steel mesh, steel braces or concrete are set under the upper steel mesh.
The brace shall ensure the correct position of upper and lower steel bars and the distance between the two floors.
(3) 180 degree hook steel hook should be up, not to the side; However, the hooks of the upper layer of the double-layer steel mesh should face down.
(4) The steel mesh of independent column foundation is subjected to bidirectional bending. If the binding method is not specified in the drawing, the short-term reinforcement should be placed on top of the long-term reinforcement.
(5) The stirrup of the cast-in-place column connected with the foundation should be smaller than the stirrup of the column by one column rebar diameter for connection.
2. Cylinders
(1) The hook of the vertical reinforcement should face the center of the column, and the included angle between the hook plane of the corner reinforcement and the formwork surface should be 15 for rectangular columns, and the included angle between the hook and the formwork should not be less than 15 when the vibrator is inserted.
(2) Stirrup joints should be staggered vertically; The corner of stirrup and the intersection of vertical reinforcement shall be bound (the intersection of straight part of stirrup and vertical reinforcement can be bound every other plum blossom). When binding stirrups, the wire buckle should be tied into a figure of eight.
(3) The vertical reinforcement of the lower column is exposed outside the floor, and tools or column hoops should be used to fit into the diameter of a column reinforcement, so as to facilitate the lap joint of the upper column reinforcement. When the cross section of the upper and lower columns changes, the exposed part of the lower column rebar must be accurately divided before binding the beam rebar.
Step 3: walls
(1) The steel mesh binding of the wall is the same as that of the foundation. When the steel bar has a hook 180, the hook should face into the concrete.
(2) When double-layer steel mesh is used, supporting iron (hook) should be set between the two layers of steel bars.
4. Beams and plates
When the longitudinal reinforcement has double or multi-layer arrangement, short reinforcement with a diameter of 25mm should be padded between two rows of reinforcement. If the longitudinal reinforcement is greater than 25mm, the diameter specification of the short reinforcement is the same as that of the longitudinal reinforcement.
Stirrup joints should be staggered and tied together with two vertical steel bars, with the stirrup joints of cantilever beam below, and other practices are the same as those of columns.
The steel mesh binding of the plate is the same as that of the foundation, but attention should be paid to the negative reinforcement (gluten) on the upper part of the plate to prevent it from being trampled; Especially awnings, overhangs, balconies and other cantilever plates, the position of negative reinforcement should be strictly controlled.
At the intersection of plate, secondary beam and main beam, the steel bar of plate is above, the steel bar of secondary beam is in the middle layer, and the steel bar of main beam is below. When there is a ring beam or beam pad, the main beam reinforcement is on it.
For the bending starting point of floor reinforcement, if there is no bending in the processing plant (field) and there is no special indication in the design drawings, the reinforcement can be bent according to the following provisions, and the side span support of the plate is taken as the bending starting point according to the span L/ 10L. The mid-span and continuous multi-span of the plate can be bent according to the center line L/6L of the bearing. (medium-medium span of L plate).
When the steel bars at the joint of the frame beam are very dense, it should be noted that the clear distance between the main bars at the top of the beam should be 30mm to facilitate the need of pouring concrete.
The binding joint of reinforcement shall meet the following requirements:
1) The distance from the end of the lap length to the bend of the steel bar should not be less than 10 times the diameter of the steel bar, and the joint should not be located at the maximum bending moment of the member;
2) In the tension zone, the end of the binding joint of Grade I steel bars should be hooked, but Grade II and III steel bars should not be hooked;
3) In axial compression members, the ends of compression grade I steel bars with a diameter not greater than 12mm and the ends of stressed steel bars with any diameter need not be provided with hooks, but the lap length should not be less than 35 times the diameter of steel bars;
4) If steel bars meet, they should be fastened with iron wires at the center and both ends.
5) The lap length of the joint at the binding place of tensile reinforcement shall meet the following requirements:
For first-class reinforcement:
When the concrete strength grade is C20, the lap length of the joint at the binding place of tensile reinforcement is 35d；;
When the concrete strength grade is C25, the lap length of the joint at the binding place of tensile reinforcement is 30 days;
When the concrete strength grade is >: C30, the lap length of the tie joint of tensile reinforcement is 25d；;
For grade Ⅱ reinforcement:
When the concrete strength grade is C20, the lap length of the joint at the binding place of tensile reinforcement is 45d；;
When the concrete strength grade is C25, the lap length of the joint at the binding place of tensile reinforcement is 40d；;
When the concrete strength grade is >: C30, the lap length of the tie joint of tensile reinforcement is 35d；;
For grade Ⅲ steel bars,
When the concrete strength grade is C20, the lap length of the joint at the binding place of tensile reinforcement is 55d；;
When the concrete strength grade is C25, the lap length of the joint at the binding place of tensile reinforcement is 50d；;
When the concrete strength grade is >: C30, the lap length of the tie joint of tensile reinforcement is 45d；;
For cold drawn low carbon steel wire,
When the concrete strength grade is C20, the lap length of the joint at the binding place of tensile reinforcement is 300mm；;
When the concrete strength grade is C25, the lap length of the joint at the binding place of tensile reinforcement is 300mm；;
When the concrete strength grade is >: C30, the lap length of the binding joint of tensile reinforcement is 300mm；;
Remarks:
1. When the diameter of secondary and tertiary steel bars is d > 25mm, the lap length of tensile steel bars shall be increased by 5d according to the above requirements.
2. When the diameter d of the threaded steel bar is less than d:C25, the lap length of the tensile welded skeleton and the welded mesh binding joint is 20d；;
For secondary reinforcement,
When the strength grade of concrete is C20, the lap length of tensile welded skeleton and welded mesh binding joint is 40d；;
When the strength grade of concrete is C25, the lap length of tensile welded skeleton and welded mesh binding joint is 35d；;
When the concrete strength grade is >: C25, the lap length of the tensioned welded skeleton and the welded mesh binding joint is 30 days;
For grade Ⅲ steel bars,
When the strength grade of concrete is C20, the lap length of tensile welded skeleton and welded mesh binding joint is 45d；;
When the strength grade of concrete is C25, the lap length of tensile welded skeleton and welded mesh binding joint is 40d；;
When the concrete strength grade is >: C25, the lap length of the tension welding skeleton and the welding net binding joint is 35d；;
For cold drawn low carbon steel wire,
When the concrete strength grade is C20, the lap length of the tensile welding skeleton and the welding net binding joint is 350mm；;
When the strength grade of concrete is C25, the lap length of tensile welded skeleton and welded mesh binding joint is 350mm；;
When the concrete strength grade is >: C25, the lap length of the tensile welded skeleton and the welded mesh binding joint is 350 mm ..
(Note:
In addition to the above provisions, the lap length shall not be less than 250mm in the tension zone and 200mm in the compression zone;
When the concrete strength grade is lower than C20, the lap length of grade I reinforcement should not be less than 40d, and that of grade II reinforcement should not be less than 50d；.
When the diameter d of the threaded steel bar is greater than 25mm, the lap length shall be increased by 5d according to the above specified value;
When the diameter d of the threaded steel bar is not more than 25mm, the lap length shall be reduced by 5d according to the above specified value;
When reinforced concrete is easily disturbed during solidification, its lap length should be appropriately increased;
The lap length between lightweight aggregate concrete welding skeleton and welding net binding head should be increased by 5d and 50mm according to the lap length of ordinary concrete for cold drawing low carbon steel wire;
When seismic requirements are met, the first-class seismic grade should be increased by 10d, and the second-class seismic grade should be increased by 5d. )
The thickness of steel protective layer should meet the design requirements. When there is no requirement in the design, it should not be less than the diameter of steel bar and meet the following requirements:
Under normal indoor environment, the thickness of reinforced concrete protective layer is15 mm; For plates, walls and shells;
Under normal indoor environment, the thickness of reinforced concrete protective layer of beams and columns is 25mm；;
In an outdoor or indoor high humidity environment, there are many problems for plates, walls, shells,
When the concrete strength grade is lower than C25, the thickness of reinforced concrete protective layer is 35mm；;
When the concrete strength grade is C25~C30, the thickness of reinforced concrete protective layer is 25mm；;
When the concrete strength grade is higher than C30, the thickness of reinforced concrete protective layer is15 mm; ;
In outdoor or indoor high humidity environment, for beams, columns,
When the concrete strength grade is lower than C25, the thickness of reinforced concrete protective layer is 45mm；;
When the concrete strength grade is C25~C30, the thickness of reinforced concrete protective layer is 35mm；;
When the concrete strength grade is higher than C30, the thickness of reinforced concrete protective layer is 25mm；;
For the foundation with cushion, the thickness of reinforced concrete protective layer is 35mm；;
For the foundation without cushion, the thickness of reinforced concrete protective layer is 70 mm
Remarks:
The thickness of reinforced protective layer of lightweight aggregate concrete should comply with the current national standard "Technical Specification for Lightweight Aggregate Concrete";
For prefabricated members produced by the factory in normal indoor environment, when the concrete strength grade is not lower than C20 and the construction quality is reliably guaranteed, the protective layer thickness can be reduced by 5mm according to the above provisions, but the protective layer thickness of prestressed steel bars (including cold-drawn low-carbon steel wires) in prefabricated members should not be less than15 mm; ; For prefabricated components in outdoor or indoor high humidity environment, when the surface is covered with cement mortar and quality assurance measures are taken, the thickness of protective layer can be adopted according to the above-mentioned values of components in indoor normal environment;
For reinforced concrete flexural members, the thickness of protective layer at the end of reinforcement should not be less than 10mm, and the thickness of protective layer of stirrups and structural reinforcement in beams and columns can be regarded as beams;
The thickness of protective layer of distributed steel bars in plates, walls and shells should not be less than 10mm, and the thickness of protective layer of stirrups and structural bars in beams and columns should not be less than15 mm. )
9, finished product protection
(1) Molded steel bars and steel mesh pieces shall be stacked in the designated place, and placed neatly with stow-wood pads to prevent bending deformation.
(2) Molded steel bars are not allowed to be trampled, and special attention should be paid to negative reinforcement parts.
(3) Pay attention to light handling during transportation, and don't throw it at will.
(4) Molded steel bars should be stacked indoors and padded to prevent corrosion after long-term use.
Third, the quality standard
1. Guaranteed project
(1) The variety, performance and quality of reinforcement must meet the design requirements and construction specifications. Reinforcement must have factory certificate and test report.
(2) The specification, shape, size, quantity, spacing, anchorage length, joint position and protective layer thickness of reinforcement must meet the design requirements and construction specifications.
2. Basic projects.
(1) The reinforcement and the skeleton shall be bound, and the missing and loose buckles shall not exceed 10% of the binding number, and shall not be concentrated.
(2) The steel bar hook is in the right direction, the binding joint conforms to the provisions of the construction specification, and the lap length is not less than the specified value.
3. Allowable deviation
The allowable deviation and inspection method of rebar installation and embedded parts position shall meet the following requirements:
The length and width of the net are10 mm; Welding mesh size10mm; Binding net size plus or minus 20 mm; The height and width of the skeleton are 5 mm; The skeleton length is10 mm; Reinforcement spacing+10mm; Reinforcement spacing plus or minus 5 mm; The spacing between welding stirrups and structural reinforcement is10mm; When binding stirrups, the structural reinforcement spacing is 20 mm; Rebar starting point displacement of 20mm；; The center line displacement of welding embedded parts is 5 mm; Horizontal elevation difference of welded embedded parts+3-0; Protective layer of foundation bearing reinforcement+10mm; Beam-column reinforced protective layer plus or minus 5 mm; The reinforced protective layer of wallboard is 3 mm
Four, to avoid the common fault of engineering quality
(1) The external dimensions of the steel skeleton are not allowed, so it is necessary to align the ends of multiple steel bars when binding, so as to prevent a certain number of steel bars from deviating from the specified position and causing the skeleton to be distorted.
(2) The thickness of protective mortar pad should be accurate, and the pad spacing should be appropriate, otherwise cracks will appear on the cantilever plate surface of the flat plate, exposing the side of the beam bottom column.
(3) When the steel skeleton is hoisted into the formwork, it should be stable, and the steel skeleton should be hoisted with a "pole". The lifting point should be determined in advance according to the shape of the skeleton, and the intersection of steel bars in the skeleton should be firmly bound and welded when necessary.
(4) After the binding of the steel skeleton is completed, the steel skeleton shall be tilted to one side, and the wire shall be tied into a figure of eight when binding. If the stirrup is omitted and the spacing is wrong, it should be adjusted in time.
(5) Stirrup joints of columns are not staggered, and should be checked before binding; Check again after binding and correct any mistakes.
(6) When pouring concrete, when the position of steel bar under lateral pressure is displaced, it should be adjusted in time.
(7) The number of steel bar joints in the same section exceeds the specification: before binding the skeleton, check the number of steel bar joints. If it exceeds the specification requirements, it needs to be adjusted before binding and molding.
Verb (abbreviation of verb) main safety technical measures
(1) When carrying steel bars, pay attention to whether there is any collision danger or material hook in the front and rear direction, especially to avoid touching the surrounding and up and down wires. Pay attention to safety when lifting steel bars manually and discharging on the upper shoulder.
(2) When lifting or installing steel bars, keep a safe distance from nearby high-voltage lines or power sources. Where there are many steel bars, it is not allowed to operate or stand during a thunderstorm.
(3) When installing steel bars at high altitude, choose a good position to stand firm and fasten your seat belt.
Technical disclosure of reinforcement engineering safety
1. Six disciplines of safety in production must be observed when entering the site.
2, steel cutting, batching, bending and other work must be carried out on the ground, are not allowed to operate at high altitude.
3. Pay attention to whether there are obstacles, overhead wires and other temporary electrical equipment nearby when carrying steel bars to prevent the steel bars from colliding with wires or getting an electric shock accident when rotating.
4, the site binding hanging beam reinforcement, shall not stand on the template operation, must operate on scaffolding; When binding independent column head reinforcement, it is not allowed to stand on the steel hoop for binding, and it is not allowed to wear wood, pipe and steel formwork as vertical plates in the steel hoop.
5. When lifting the steel skeleton, it is forbidden to stand below. You must stay below the skeleton to a place 1 m away from the formwork before you can get off the hook.
6, lifting steel, specifications must be unified, no uneven length, no hanging.
7, cutting machine before use, must check whether the mechanical operation is normal, with or without leakage; The power cord must enter the leakage switch, and flammable items are not allowed to pile up behind the cutting machine.
8, steel foreman should be cleaned up in time, finished products should be neatly stacked, the workbench should be stable, and the lighting of steel barrack must be covered with a net.
9. When working high above the ground, steel bars shall not be piled up on the formwork and scaffolding, and tools, steel hoops and short steel bars shall not be placed on the scaffolding at will to avoid slipping down and hurting people.
10. Open-air operation must be stopped in case of thunderstorm to prevent steel bars from being injured by lightning.
1 1. No matter whether the steel skeleton is fixed or not, it is forbidden to walk on the floor and get up and down from the steel hoop on the post.
Disclosure:
According to Code for Acceptance of Construction Quality of Concrete Structure Engineering (GB50204—2002).
(a), construction preparation
1. Mechanical equipment
Steel bar cold drawing machine, straightening machine, cutting machine, bending forming machine, hoop bending machine and corresponding lifting equipment.
2. Materials
All kinds of specifications and grades of steel bars must have factory certificates. After entering the factory (field), the physical performance must be verified, and it can only be used after passing the inspection.
3. Fuck oak parts
(1) Before operation, all kinds of equipment shall be overhauled to ensure normal operation and compliance with safety regulations.
(2) The reinforcement drawing has been completed.
(2) Operation technology
1, steel surface should be clean, sticky oil, dirt, rust must be removed before use, can be combined with cold mechanic.
Rust removal.
2, steel bar straightening, available mechanical or artificial straightening. After straightening, steel bars should not have local bending, dead bending and wavelet.
Wavy, its surface scars should not be reduced by 5% of the steel section.
3. Steel bars should be cut according to the number, diameter, length and quantity of steel bars, and the length should match, and the long material should be cut first and then the short material should be cut.
Reduce and shorten the short ends of steel bars to save steel.
4. Steel hook or elbow
(1) steel hook. There are three forms, namely semi-circular hook, straight hook and inclined hook. After the steel bar is bent, the inner skin layer contracts, and the outer skin layer extends with the same axial length, forming an arc at the bend, and the size after bending is larger than the blanking size. When the bending angle of steel bar is 135, the bending adjustment value of steel bar is 2.5d.
(2) Stirrups
Hook should be made at the end of stirrup, with hook 135 ",and the length of straight part is 10d.
(3) The blanking length of reinforcement should be considered comprehensively according to the component size, the thickness of concrete cover, the bending and straightening of reinforcement and the increase of hook length.
(3) Quality standards
Master control project:
(1) The variety and quality of reinforcement must meet the design requirements and the provisions of relevant standards.
Inspection method: check the factory certificate and test report of the product.
(3) The surface of steel bar should be kept clean. Granular or flaky old rusty steel bars with pits after derusting are strictly prohibited to be used according to the original specifications.
Inspection method: observation and inspection.
(4) The specification, shape, size, quantity, anchorage length and joint position of reinforcement must meet the design requirements and construction specifications.
Inspection method: observation and ruler inspection.
(4) product protection
(1) All kinds of semi-finished steel bars shall be neatly stacked according to specifications, models and varieties, and signs shall be hung. The stacking place should be covered to prevent rain and sun exposure.
(2) Semi-finished steel bars should be carefully loaded and unloaded during transshipment, and they should not be thrown at will to avoid deformation of steel bars.
Five, the construction matters needing attention
(1) The cutting size of steel bar is not allowed. Adjust or rework according to the position of structural steel bars and the error after cutting steel bars.
(2) The forming size of steel bar is inaccurate, the stirrup is skewed, and the shape error exceeds the allowable value of quality standard. For grade I reinforcement, it can only be straightened and bent once again, and other grades of reinforcement shall not be straightened and bent repeatedly.
Six, the main safety technical measures
(1) machinery must be equipped with protective devices. Note that each machine must have a brake and a leakage protection switch.
(2) Keep the roads in the workplace unblocked, and the dangerous parts must be clearly marked.
(3) Operators must hold relevant certificates. Familiar with mechanical properties and operating procedures.
First, the construction preparation
1. material
The quality of semi-finished steel bars should meet the requirements of design drawings. The iron wire for steel binding is 20 ~ 22 # iron wire (galvanized iron wire).
Cement board: it should have a certain strength.
2. Tools
Commonly used lead wire hooks, small wrenches, sliding bars, bookbinding frames, folding rulers or tape measures, white chalk, special transportation equipment, etc.
3. Fuck oak parts
(1) Be familiar with the drawings, and check whether the grade, diameter, size and quantity of semi-finished steel bars are consistent with the bill of materials. If there are any mistakes and omissions, correct and supplement them in time.
(2) Prepare iron wire, cement board and common binding tools and machines.
(3) rebar positioning: draw the rebar installation position line. When there are many kinds of steel bars, the specifications, shapes and quantities of steel bars of various components shall be indicated on the installed formwork.
(4) When binding complex structural members, the order of shuttering and binding should be considered in advance, and the installation scheme should be made.
(5) Before installation, all sundries at the joint should be cleaned up.
Second, the operation process
1. basis.
(1) The steel mesh of independent column foundation is subjected to biaxial bending. If the binding method is not specified in the drawing, the short-term reinforcement should be placed on top of the long-term reinforcement.
(2) The stirrup of the cast-in-place column connected with the foundation should be smaller than the stirrup of the column by one column rebar diameter for connection.
2. Cylinders
(1) The hook of the vertical reinforcement should face the center of the column. For rectangular columns with small cross section, the included angle between the hook plane of the corner reinforcement and the formwork surface should be 15. When inserting the vibrator, the angle between the hook and the template should not be less than 15.
(2) Stirrup joints should be staggered vertically; The intersection of stirrup corner and vertical reinforcement should be fastened. When binding stirrups, the wire buckle should be tied into a figure of eight.
3. Beams and plates
When the longitudinal reinforcement has double or multi-layer arrangement, short reinforcement with a diameter of 25mm should be padded between two rows of reinforcement. If the longitudinal reinforcement is greater than 25mm, the diameter specification of the short reinforcement is the same as that of the longitudinal reinforcement.
Stirrup joints should be staggered and tied together with two vertical steel bars, with the stirrup joints of cantilever beam below, and other practices are the same as those of columns.
The steel mesh binding of the plate is the same as that of the foundation, but attention should be paid to the negative reinforcement (gluten) on the upper part of the plate to prevent it from being trampled; Especially awnings, overhangs, balconies and other cantilever plates, the position of negative reinforcement should be strictly controlled.
At the intersection of plate, secondary beam and main beam, the steel bar of plate is above, the steel bar of secondary beam is in the middle layer, and the steel bar of main beam is below. When there is a ring beam or beam pad, the main beam reinforcement is on it.
4, tensile steel binding joint lap length, shall meet the following requirements:
Grade I reinforcement: when the concrete strength grade is C20, the lap length of the joint at the binding place of tensile reinforcement is 35d；; Secondary reinforcement: when the strength grade of concrete is C20, the lap length of the joint at the binding place of tensile reinforcement is 45d；;
5. Thickness of steel protective layer: foundation: 40mm; beam and column: 30mm；; Plate 20 mm
Third, the quality standard
1. Master project
(1) The variety, performance and quality of reinforcement must meet the design requirements and construction specifications. Reinforcement must have factory certificate and test report.
(2) The specification, shape, size, quantity, spacing, anchorage length, joint position and protective layer thickness of reinforcement must meet the design requirements and construction specifications.
2. General items.
(1) The reinforcement and the skeleton shall be bound, and the missing and loose buckles shall not exceed 10% of the binding number, and shall not be concentrated.
(2) The steel bar hook is in the right direction, the binding joint conforms to the provisions of the construction specification, and the lap length is not less than the specified value.
(3) Allowable deviation
The allowable deviation and inspection method of rebar installation and embedded parts position shall meet the following requirements:
The height and width of the skeleton are 5 mm; The skeleton length is10 mm; Reinforcement spacing+10mm; Reinforcement spacing plus or minus 5 mm; Spacing between stirrups and structural reinforcement is18mm; ; Protective layer of foundation bearing reinforcement+10mm; Beam-column reinforced protective layer plus or minus 5 mm. ..
Fourth, finished product protection
(1) Molded steel bars and steel mesh pieces shall be stacked in the designated place, and placed neatly with stow-wood pads to prevent bending deformation.
(2) Molded steel bars are not allowed to be trampled, and special attention should be paid to negative reinforcement parts.
(3) Pay attention to light handling during transportation, and don't throw it at will.
(4) The formed steel bars should be stacked indoors and padded to prevent corrosion after long-term use.
Five, the construction matters needing attention
(1) The external dimensions of the steel skeleton are not allowed, so it is necessary to align the ends of multiple steel bars when binding, so as to prevent a certain number of steel bars from deviating from the specified position and causing the skeleton to be distorted.
(2) The thickness of protective mortar pad should be accurate, and the pad spacing should be appropriate, otherwise cracks will appear on the cantilever plate surface of the flat plate, exposing the side of the beam bottom column.
(4) After the binding of the steel skeleton is completed, the steel skeleton shall be tilted to one side, and the wire shall be tied into a figure of eight when binding. If the stirrup is omitted and the spacing is wrong, it should be adjusted in time.
(5) Stirrup joints of columns are not staggered, and should be checked before binding; Check again after binding and correct any mistakes.
(6) When pouring concrete, when the position of steel bar under lateral pressure is displaced, it should be adjusted in time.
(7) The number of steel bar joints in the same section exceeds the specification: before binding the skeleton, check the number of steel bar joints. If it exceeds the specification requirements, it needs to be adjusted before binding and molding.
Six, the main safety technical measures
(1) When carrying steel bars, pay attention to whether there is any collision danger or material hook in the front and rear direction, especially to avoid touching the surrounding and up and down wires. Pay attention to safety when lifting steel bars manually and discharging on the upper shoulder.
(2) When lifting or installing steel bars, keep a safe distance from nearby high-voltage lines or power sources. Where there are many steel bars, it is not allowed to operate or stand during a thunderstorm.
(3) When installing steel bars at high altitude, choose a good position to stand firm and fasten your seat belt.