The main construction methods and technical measures of steel reinforcement engineering
6.4.1. The construction process of steel reinforcement engineering.
The construction process of reinforcement engineering is as follows:
Figure 64-1 Process flow chart of reinforcement engineering construction.
6.4.2. Inspection, processing and stacking of steel bars.
1) When the steel bar enters the site, the on-site material personnel inspect the steel factory certificate, heat number and batch, after the steel bar enters the site, the tester immediately does the retest of the steel bar, and the steel bar can be approved for use only after the retest is passed.
2) The longitudinal reinforcement processing of the component is processed and produced on site, and the stirrups are considered to be processed off-site. After forming, it is transported to the construction face by the tower crane. The reinforcement batching work is carried out by the subcontracted full-time reinforcement personnel responsible for civil construction in strict accordance with the specifications and design requirements. The project prepares steel bar processing and first-class plans according to the construction progress of the project and the on-site storage capacity.
3) The identification indicates the use of parts, specifications, quantities, dimensions, etc., and the steel bar identification plate should be unified and consistent.
The amount of steel bars in this project is large, there are many types, and the steel bars are stacked in an orderly manner according to the level and model after entering the site.
6.4.3 Rebar binding.
1.Foundation reinforcement binding.
1) Construction process.
Elastic line positioning, erection of steel bar binding, steel pipe shelf, cushion cap steel bar binding, foundation beam steel bar binding, cushion cap, foundation beam steel bar in place, steel pipe frame removal, bottom plate bottom bar binding, bottom plate stool bar placement, bottom plate gluten binding, column, wall plate reinforcement cleaning, concealed acceptance.
2) Construction points.
1) The foundation is made of brick fetal membrane, and when the steel bar of the foundation bottom plate is tied, the strength of the fetal membrane and concrete cushion must reach a certain strength to ensure the safety of the fetal membrane.
2) When there is a situation that the raft foundation beam is an anti-beam, the bottom reinforcement is lapped in the range of LN 3 in the middle of the span, and the gluten is lapped in the bearing;The stirrup opening is downward, and the stirrup opening at the cantilever end of the beam is upward.
3) bottom plate reinforcement binding: calculate the actual number of reinforcement roots of the bottom plate according to the drawing, the reinforcement is 50 from the edge of the template, pop up the reinforcement position line on the waterproof protective layer, when the reinforcement is in place, place the reinforcement according to the reinforcement position line. The bottom plate is provided with a long stirrup to ensure the spacing and position of the steel bars of the bottom plate.
4) After the reinforcement of the bottom plate is completed, the vertical reinforcement of the wall is inserted. According to the position line of the wall and column that springs well, the reinforcement of the wall and column stretching into the foundation is tied firmly, the depth of the insertion foundation should meet the anchorage length, the upper end of the horizontal positioning frame is positioned with the horizontal positioning frame, the first horizontal positioning frame is placed at the root of the reinforcement, and the bottom plate reinforcement is tied firmly, and the second reinforcement is placed at the lap position of the first reinforcement, the binding is firm, and the adjustment is in place to ensure that the reinforcement is vertical, not skewed, not dumped, and not in place.
2.Column reinforcement construction.
1) Process flow:
Bullet column line Set column stirrups Column vertical reinforcement connection Draw stirrup spacing line Stirrup binding.
2) Construction points.
1) The bottom plate reinforcement is tied, the column reinforcement and the wall plate reinforcement are tied, and the reinforcement should all be straight to the bottom of the foundation beam, and the anchorage length should be met, and the upper end should be left above the first layer of structural surface at a time, and the joint length above the negative floor should be left as required, and staggered by 50%;The position of the reinforcement should be accurate, the fixing should be firm, the joint should be staggered on the same section, not more than 50%, and two stirrups should be tied at the bottom of the foundation beam.
2) After the column reinforcement is in place, a stirrup and the stirrup of the foundation beam are set at the lower mouth of the bottom plate and welded firmly, and the positioning stirrup and the beam reinforcement are welded firmly at the lower mouth of the column.
3) Column stirrups: according to the spacing required by the drawings, calculate the number of stirrups for each column, after the main reinforcement of the column is erected, the stirrups are sleeved on the column reinforcement, and the stirrup spacing line is drawn with chalk on the main reinforcement of the column.
4) The plastic card of the column reinforcement protective layer is stuck on the outer vertical reinforcement, and the spacing is 1000 to ensure that the thickness of the main reinforcement protective layer is accurate.
3.Wall rebar binding.
1) The lashing process is shown in the figure below
Figure 64-2 Process flow diagram of wall reinforcement binding.
2) Construction points.
1) According to the position line of the wall and dark column, adjust the wall and column reinforcement in proportion to meet the requirements of the protective layer, and ensure that the wall reinforcement and dark column reinforcement are vertical, not skewed, not dumped, and not in place.
2) Binding lintel reinforcement: when the lintel reinforcement is tied, the leveling is carried out with a leveling scale, considering the practice of building ground, the stirrups require uniform spacing, perpendicular to the main reinforcement of the beam, and the stirrups are fully tied when the stirrup size standard is consistent with the capping beam.
3) Binding wall reinforcement: first tie the vertical positioning ladder reinforcement of the wall, the vertical positioning ladder reinforcement spacing is 1200 1500 apiece, evenly arranged, encounter the dark column spacing is small, can be placed in the middle of the two dark columns as appropriate;The spacing of the fixed distance frame is the same as the spacing of the horizontal ribs, and the top mold supports the upper middle and lower respectively, brushed with anti-rust paint, which is smaller than the wall thickness 2, and 1 on one side;The height of the ladder bar is required to be consistent.
4) after the wall vertical reinforcement is tied, the horizontal reinforcement of the wall is tied, and the horizontal reinforcement spacing is tied according to the ladder pedal distance of the vertical positioning ladder reinforcement, and the first starting reinforcement is 50 from the top plate surface, and at the same time it is guaranteed that there are three horizontal reinforcements in the lap section, and the length of the wire is required to be consistent.
4.Beam and plate reinforcement binding.
1) Process flow:
Binding the main beam reinforcement Binding the secondary beam reinforcement Marking the position of the reinforcement Pulling through the line binding the reinforcement at the bottom of the plate Pulling through the line binding the reinforcement on the surface of the plate Placing the protective layer cushion block Adding the reinforcement stirrup Adjusting the position of the wall and column reinforcement Cleaning Concealment acceptance.
2) Construction points.
1) Before the reinforcement is tied, check whether the grade, model, shape, size and quantity of the reinforcement are the same as the design drawings and processing batching list
2) after the beam bottom template is erected, the main and secondary beam reinforcement are tied successively, and the spacing of stirrups is guaranteed to be uniform and the main beam reinforcement can be completely hoopped;
3) after the beam reinforcement is tied, the side template of the supporting beam, the binding plate reinforcement, the position line of the reinforcement is drawn on the bottom mold, and the reinforcement binding construction is carried out according to the marking line;
4) When the steel bar is tied, the intersection point of the steel bar must be all tied, and the figure eight buckle must be used to bind the steel bar without displacement;Within the scope of the steel lap joint, in addition to the intersection, three additional thread buckles should be added for binding;
5) Place the roof protective layer cushion block, according to the @800mm distance in the plum blossom shape, after the cushion block is placed to ensure a horizontal, vertical and oblique line;The stool steel bar is spaced 1000mm apart, which is required to be placed evenly and neatly.
5.Staircase rebar lashing.
1) Process flow:
The process flow is shown in the figure below
Figure 64-3 Process flow diagram of staircase reinforcement construction.
2) Construction points.
1) Draw the position line of the main reinforcement and the distribution reinforcement on the stair floor.
2) According to the direction of the stair beam reinforcement, the main reinforcement and the distribution reinforcement in the design drawing, when the stair beam is tied, the beam is tied first and then the plate is tied. The plate reinforcement should be anchored to the beam, and then the main reinforcement should be tied and then the distribution reinforcement should be tied, the position line of the main reinforcement and the distribution reinforcement should be drawn on the stair floor, the main reinforcement should be tied first and then the distribution reinforcement should be tied, and each intersection point should be tied.
3) The construction joint of the rest platform must be added with a stool, and the foot cushion block of the stool;The stair beams are supported by top beams.
4) After the bottom plate reinforcement is tied, the tread reinforcement is tied, and then the tread template is supported.
6.4.4 Rebar connection.
1) The steel bar with a diameter of 18mm is lapped with a diameter of 18mm, and the diameter of 18mm is mechanically connected with a straight thread, and the connection performance grade is grade I. The quality and construction requirements of the joints should meet the requirements of the corresponding mechanical connection specifications.
2) the column reinforcement diameter <18 adopts binding connection, and diameter 18 adopts straight thread connection.
3) The vertical reinforcement of shear wall 16mm is connected by straight thread sleeve, and the reinforcement of diameter 16mm is connected by lashing lap. The horizontal reinforcement of the shear wall is lapped by lashing.
4) The main reinforcement of the beam is mechanically connected by straight thread, and the steel bar with a diameter of <18mm is connected by lashing.
5) The floor slab reinforcement adopts lashing lap.
6) Straight thread connection construction method.
1) Straight thread processing: a grinding wheel cutting machine is used for steel bar cutting, and the cross-section of the end of the steel bar is perpendicular to the axis of the steel bar and does not warp.
The two ends of the steel bar are stuck on the threading machine, and the water-soluble cutting cooling lubricant is used for cooling and lubrication. The large-diameter steel bars should be turned to the specified size in stages to ensure the accuracy of the thread fastener, and the general gauge and stop gauge should be used for inspection.
2) The straight thread construction process is shown in the figure below
Figure 64-4 Straight Thread Connection Construction Flow Chart.
3) Straight thread connection: Before connecting the steel bar, unscrew the plastic protective cap at the upper end of the lower steel bar to expose the thread buckle, and clean up the cement slurry and other dirt on the wire buckle.
When connecting the steel bar, screw the upper steel bar of the twisted sleeve to the steel bar to be connected, and tighten the steel bar joint with a torque wrench according to the specified torque value, until the torque wrench makes a sound at the adjusted torque value, and paint marks are drawn to prevent the steel bar joint from leaking. Torque wrenches should be calibrated every six months.