6
. 
When the steel bars enter the site, the test pieces shall be selected for mechanical property inspection according to the current national standard “hot rolled ribbed steel bars for reinforced concrete”, and the quality must meet the requirements of relevant standards
. 
If the main reinforcement of the column is lapped with plain round reinforcement, the corner hook shall be 45 degrees with the formwork, and the hook of the middle reinforcement shall be 90 degrees with the formwork
. 
The transverse reinforcement inside or outside the vertical reinforcement shall meet the design requirements
. 
The lap length of binding joint shall meet the design requirements and regulations
. 
3
. 
02 shear wall reinforcement binding construction process: erect 2-4 vertical reinforcement → draw horizontal reinforcement spacing → bind positioning transverse reinforcement → bind other reinforcement and vertical reinforcement → set reserved hole → set reserved hole additional reinforcement operation points: 1
. 
When pouring concrete, a special person shall be assigned to take care of it, and it shall be adjusted again after pouring to ensure the accuracy of the reinforcement position
. 
When the column section changes, the exposed part of the lower column reinforcement must be accurately contracted before binding the beam reinforcement
. 
Within 500mm above the concrete surface, the main reinforcement shall be wrapped with plastic film to reduce the pollution of concrete to the main reinforcement
. 
After the formwork is closed, the protruding vertical reinforcement shall be repaired, and a horizontal ladder reinforcement shall be tied on the upper opening of the formwork about 200 mm for positioning
. 
If the column concrete is poured first and then the shear wall reinforcement is bound, the connecting reinforcement or embedded iron parts shall be reserved in the column, which shall be used for connection when the column formwork is removed and the wall reinforcement is bound
. 
Draw the stirrup spacing line: draw the stirrup spacing line with chalk on the vertical reinforcement of the erected column according to the requirements of the drawing
. 
When the binding lapped connection is adopted, the binding shall not be less than 3 within the lap length, and the binding shall be toward the center of the column
. 
2) The joint of stirrup (the joint of hook) shall be staggered on the four corner longitudinal reinforcement; the intersection of stirrup corner and longitudinal reinforcement shall be tied firmly (the intersection of straight part of stirrup and longitudinal reinforcement can be tied firmly at intervals); when binding reinforcement, the binding buckle shall be in an octagonal shape
. 
If the design requires that the stirrups are provided with tie bars, the tie bars shall be hooked at the junction of the stirrups and the main reinforcement
. 
Binding of column reinforcement: according to the position line of reinforcement, the upper part of the plate is corrected, the column reinforcement is reserved, and the column reinforcement is hoisted and bound
. 
5
. 
The first stirrup is generally 50mm from the floor
. 
7
. 
The reinforcement skin shall be bound with cushion block or plastic card
. 
Stirrups for column: calculate the number of stirrups for each column according to the spacing required in the drawing, first cover the stirrups on the lapped bars protruding from the lower layer, and then erect the column reinforcement (including mechanical connection or electroslag pressure welding connection construction)
. 
At the joint of shear wall and frame column, the horizontal bar of shear wall should be anchored into the frame column, and its anchorage length should meet the design requirements
. 
The reinforcement of frame beam, bracket and column cap shall be placed inside the longitudinal reinforcement of column
. 
2
. 
5) The stirrups at the upper and lower ends of the column shall be densified, and the length of the densified area and the stirrup spacing in the densified area shall meet the requirements of the design drawings
. 
After binding and forming, the positioning fixture shall be installed at 20cm above the floor elevation and firmly bound with the main reinforcement
. 
9
. 
After the concrete pouring is completed, the plastic film shall be cleaned up during the calendering, and the concrete around the reinforcement shall be plastered and compacted
. 
8
. 
4) If the stirrup is lapped at 90 degrees, the lap joint shall be welded, and the length of single side weld shall not be less than 5D
. 
The spacing of the limiting reinforcement is the diameter of the main reinforcement of the column + 10 mm
. 
Wall reinforcement binding shall be carried out before formwork installation
. 
5
. 
4
. 
3) The overlapping place of stirrup hook shall be staggered along the column vertical reinforcement and bound firmly; when the stirrup is closed and overlapped with the column main reinforcement everywhere, the stirrup hook shall be set with straight section to ensure that the stirrup and the main reinforcement fit together; the stirrup shall be staggered from the straight thread sleeve connection area as far as possible
. 
Bind the vertical bar with the lap bar extending from the lower layer, draw the horizontal bar grading mark on the vertical bar, bind two horizontal bars at the lower part and chest level for positioning, draw the vertical bar grading mark on the horizontal bar, then bind the rest of the vertical bars, and finally bind the horizontal bars
.
After the main reinforcement positioning card is made, it shall be painted with yellow paint
.
6
.
2
.
When the steel bars enter the site, the test pieces shall be selected for mechanical properties and weight deviation inspection according to the current national standard “hot rolled ribbed steel bars for reinforced concrete”, and the quality must meet the requirements of relevant standards
.
Stirrup and main reinforcement should be vertical
.
Quality requirements: 1
.
The hook of the reinforcement shall face into the concrete
.
Quality requirements: 1
.
Production of positioning fixture: before column reinforcement binding, make reinforcement fixture according to the spacing of column main reinforcement
.
2
.
2
.
The reinforcement of shear wall shall be bound point by point, and the tie bar or support bar shall be bound between the two rows of reinforcement, which can be made of reinforcement with a diameter of 6-10 mm, and the vertical and horizontal spacing shall not be greater than 60 mm
.
After the column reinforcement is bound, it is not allowed to climb
.
Column stirrup binding: 1) according to the drawn stirrup position line, move the sheathed stirrup upward and bind it from top to bottom, and it is better to use wrapping buckle binding
.
Setting of protective layer: the cushion block of protective layer shall be tied to the outer skin of longitudinal reinforcement of column, cement mortar cushion block and plastic card shall be used, and the spacing shall be controlled at about 1000mm to ensure the correct thickness of protective layer of main reinforcement
.
The starting distance of wall reinforcement from floor slab surface or hidden column edge is 50 mm
.
5
.
3
.
The surface of the positioning card is clean without rust, defect and oil stain
.
3
.
3
.
If there is any change, the design change document shall be handled
.
Positioning fixture placement of column reinforcement: bind the column reinforcement according to the drawing requirements
.
7
.
The end of stirrup should be bent 135 ° and the length of straight part is 10d
.
The installation position of the positioning card shall be strictly controlled to avoid too high and too low, which is not easy to take out after pouring concrete
.
6) If the reinforcement of the lower column is exposed to the floor, the tool type column hoop should be used to retract it into a column reinforcement diameter 50cm above the floor, so as to lap the reinforcement of the upper column
.
The specification, shape, size, quantity, anchorage length and joint position of the reinforcement must comply with the provisions of the design and construction drawings and specifications
.
Operation points: 1
.
The construction process of column reinforcement binding is as follows: column reinforcement binding → installation of column reinforcement positioning fixture → platform concrete pouring → removal of positioning fixture → set column stirrup → connection of column main reinforcement → binding of vertical stressed reinforcement → drawing stirrup control line → stirrup binding → setting of protective layer
.
The specification, shape, size, quantity, anchorage length and joint position of the reinforcement must comply with the provisions of the design and construction drawings and specifications
.
When the floor height exceeds 4m, the scaffold shall be erected for binding, and measures shall be taken to fix the reinforcement to prevent the column reinforcement framework from being vertical
.
It is not allowed to weld the main reinforcement to fix the reinforcement of the reserved hole box
.
The reinforcement shall be bound firmly without looseness or displacement.
.
The anchorage length of horizontal reinforcement of shear wall at both ends, corner, cross joint, coupling beam and reinforcement around the opening shall meet the seismic design requirements
.
The length of ladder bar and f-clip top mold rod is – 2mm thick, cut by cutting saw, and both ends of top mold rod are coated with antirust paint
.
4
.
Connection of vertical stressed reinforcement: the main reinforcement of column ≥ Φ 16mm is mechanically connected with straight thread sleeve; for Φ 12mm and Φ 14mm, electroslag pressure welding connection or steel bar binding and lapping connection is considered according to the actual situation on site; for < Φ 12mm, steel bar binding and lapping connection is adopted
.
The surface of reinforcement shall be clean without rust, defect and oil stain
.
The cutting or adjustment of the wall reinforcement at the reserved hole shall be standardized, and the additional reinforcement shall be set according to the design drawings and specifications
.
If there is any change, the design change document shall be handled
.
The reserved length shall comply with the design or specification
.
The fixture fixing reinforcement is made of φ 14 reinforcement and the limiting reinforcement is made of φ 6 reinforcement
.
4
.
6
.
The processing size of column bar positioning card must be in strict accordance with the column main bar spacing and column main bar diameter, and the allowable deviation of main bar is ± 5mm
.
The concealed acceptance of reinforcement should meet the relevant requirements of code for acceptance of construction quality of concrete structure engineering
.
