How many methods are there for steel bar binding? What is the difference?

Steel binding has the following four methods:

A, plate steel binding

1, process flow: clean the formwork → draw lines on the formwork → tie the reinforced bar under the slab → tie the negative moment reinforced bar.

2. Clean up the sundries on the template, draw the main reinforcement on the template with chalk, and distribute the spacing of reinforcement.

3, according to the planned spacing, put the main reinforcement first, then put the distribution reinforcement. Embedded parts, electrical conduits and reserved holes shall be installed in time. Two-way stress plate, short-term reinforcement below, long-term reinforcement above.

4. When there is a plate beam in the cast-in-place slab, the plate beam reinforcement shall be bound first, and then the plate reinforcement shall be placed.

5. When binding plate reinforcement, straight buckle or splayed buckle is generally adopted. Except for the intersection of two peripheral tendons, other points can be bound alternately (all intersections of two-way slabs must be bound). If the floor is a double-layer reinforced bar, a reinforced horse stool should be added between the two layers of reinforced bars to ensure the position of the upper reinforcement. Each intersection of negative moment reinforcement shall be bound.

6, reinforced mortar pad, spacing1.5mm. The thickness of the pad is equal to the thickness of the protective layer, which should meet the design requirements. When there is no requirement in the design, the thickness of the protective layer of the slab should be 15㎜, and the requirements for the lap length and lap position of reinforcement are the same as those of the beam mentioned above.

Second, the stairs steel binding

1. process flow: draw the position line → tie the main reinforcement at the bottom of the ladder board → tie the negative reinforcement of the ladder board.

2. Draw the position lines of main reinforcement and distribution reinforcement on the stair board.

3. According to the direction of main reinforcement and distribution reinforcement in the design drawings, tie the main reinforcement first and then the distribution reinforcement, and tie each intersection. If there is a stair beam, tie the beam first, and then tie the slab reinforcement. Plate reinforcement should be anchored in the beam.

4. After the bottom plate reinforcement is tied, tie the ladder plate negative reinforcement. The number and position of main reinforcement and negative reinforcement should meet the design requirements.

Third, the column steel binding process

1, process flow: vertically stressed steel bar connection → draw stirrup spacing line → set column stirrup → tie stirrup.

2, steel bar connection must comply with the design requirements.

3. Draw the stirrup spacing line: draw the stirrup spacing line with chalk on the vertical bar of the column that has been erected.

4. Column stirrups: According to the spacing required by the drawings, calculate the number of stirrups for each column. First, set stirrups on the overlapping ribs protruding from the lower layer, and then reinforce the columns. Within the lap length, there shall be no less than three binding buckles, and the binding buckles shall face the center of the column. When the main reinforcement of the column is overlapped with round steel, the hook at the corner should be 45 with the template, and the hook at the middle reinforcement should be 90 with the template.

Four, beam steel binding

1. process flow: in-mold binding: draw the stirrup spacing between primary and secondary beams → place the stirrups between primary and secondary beams → pass through the longitudinal bars at the bottom of the main beam and fix them with stirrups → pass through the longitudinal bars at the top of the main beam → bind according to the stirrup spacing → pass through the longitudinal bars at the top of the secondary beam → bind according to the stirrup spacing.

Binding outside the formwork: draw stirrup spacing → spread several cross bars at the upper mouth of the formwork for primary and secondary beams → pass through the lower longitudinal bars of the main beam → pass through the upper longitudinal bars of the main beam → bind according to stirrup spacing → pass through the upper longitudinal bars of the secondary beam → pull out the cross bars and fall into the formwork.

2. Draw the stirrup spacing on the beam side formwork and place the stirrup.

3. First, pass through the longitudinal stress reinforcement and bending reinforcement at the lower part of the main girder, and separate the stirrups one by one according to the drawn spacing; Wear the longitudinal stressed steel bars and bent steel bars at the lower part of the secondary beam, and set stirrups; Put the scissors of primary and secondary beams; Tie up the installation stud and stirrup at regular intervals; Adjust the spacing of stirrups to meet the design requirements, tie vertical bars, then tie main bars, and coordinate primary and secondary beams at the same time.

4. The upper longitudinal reinforcement of the frame beam should run through the middle node, and the anchorage length of the lower longitudinal reinforcement of the beam should meet the design requirements.

5, binding beam upper longitudinal reinforcement stirrup, appropriate uses set of buckle method binding.

Extended data:

Quality acceptance before steel binding:

1, according to the design requirements and specifications, check whether the specification, shape, size and quantity of processed steel bars are correct.

2, check whether the concrete laitance or other pollution on the wall column reinforcement is clean. ?

3, to do a good job of copying, indicating the horizontal elevation, pop-up column (embedded column), doors and windows, ground beam, wall dimension line and axis line of control. ?

4, according to the elastic line, check whether there is a deviation phenomenon of steel bar, if there is a deviation distance less than the diameter d of steel bar, adjust the deviation steel bar to the correct position as shown in the figure, if the deviation is greater than the diameter d of steel bar, it needs to be reported for design treatment.

5. Check whether the staggered distance of exposed joint of vertical reinforcement of wall column meets the requirements. ?

6. Check the joint quality of steel bar electroslag pressure welding and steel bar straight thread one by one. If any unqualified joints are found, cut off and re-weld.

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