Binding preparation

(1) Check the drawings and organize the binding work in strict accordance with the construction scheme.

(2) Draw the stirrup spacing on the beam side formwork and inspect the stirrup.

 

Beam reinforcement binding

(1) Firstly, the longitudinal stressed reinforcement and bent reinforcement at the lower part of the main beam shall be penetrated, and the stirrups shall be separated one by one according to the drawn spacing; Then pass through the lower longitudinal stressed reinforcement and bent reinforcement of the secondary beam, and set the stirrup; Place the erection reinforcement of the primary and secondary beams; Bind the erection reinforcement and stirrup firmly at a certain interval; Adjust the stirrup spacing to make the spacing meet the design requirements, kidnap the vertical reinforcement, bind the main reinforcement, and cooperate with the main and secondary beams at the same time.
(2) The longitudinal reinforcement at the upper part of the frame beam shall pass through the middle node, and the longitudinal reinforcement at the lower part of the beam shall extend into the middle node. The anchorage length shall not be less than Lae, and the length extending beyond the center line shall not be less than 5D (D is the diameter of the reinforcement). At the end node of the middle layer of the frame, the anchorage length of the upper longitudinal reinforcement of the frame beam at the end node shall not be less than Lae, the horizontal projection length before bending shall not be less than 0.41ae, and the vertical projection length after bending shall be 1.5 times the diameter of the longitudinal reinforcement of the beam. The anchoring measures of the longitudinal reinforcement at the lower part of the beam in the end node of the middle layer are the same as those at the upper part of the beam, but the vertical section shall be bent upward into the node, as shown in Figure 4-17.
(3) The stirrup of the longitudinal reinforcement at the upper part of the beam should be bound by the buckle method
(4) The coordination relationship between beam reinforcement binding and formwork installation is as follows.

 

① When the height of the beam is small, the reinforcement of the beam is tied overhead on the beam top, and then placed.
② When the height of the beam is large (greater than or equal to 1.0m), the reinforcement of the beam should be bound on the beam bottom formwork, and the formwork on both sides or one side should be installed later.
(5) When binding the beam and slab reinforcement, the reinforcement shall be prevented from being lifted or pressed down by the water and electricity pipeline.
(6) At the intersection of slab, secondary beam and main beam, the reinforcement of slab is at the top, the reinforcement of secondary beam is in the middle, and the reinforcement of main beam is at the bottom, as shown in Figure 4-18; When there is a ring beam or pad beam, the reinforcement of the main beam is on the, as shown in Figure 4-19.

 

 

(6) At the intersection of slab, secondary beam and main beam, the reinforcement of slab is at the top, the reinforcement of secondary beam is in the middle, and the reinforcement of main beam is at the bottom, as shown in Figure 4-18; When there is a ring beam or pad beam, the reinforcement of the main beam is on the, as shown in Figure 4-19.
(7) When the reinforcement at the frame joint is very dense, it shall be noted that the clear distance between the main reinforcement on the beam top surface shall be 30mm to facilitate concrete pouring.
(8) The hooks at the overlap of stirrups shall be bound alternately in the beam. The stirrup hook is 135 and the length of the straight part is 10d (D is the diameter of stirrups). If the closed hoop is made, the length of single-sided weld is 5D (D is the diameter of stirrup).

 

 

 

(9) The first stirrup at the beam end shall be set 50mm away from the edge of the column node. Stirrups at the junction of beam end and column shall be densified, and their spacing and length of densified area shall meet the design requirements.
(10) Cushion blocks (or plastic cards) shall be padded under the stressed bars of the main and secondary beams to ensure the thickness of the protective layer. When the stressed reinforcement is in double rows, short reinforcement can be used to pad between the two layers of reinforcement, and the row spacing of reinforcement shall meet the design requirements.