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Reinforcement engineering is an extremely important project in building construction, and its construction quality is the key to determine the quality of building structure, which will also affect the subsequent project construction
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Civil Jun before sharing steel construction quality common fault treatment, learned to solve the problem is not enough, more important is to prevent
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Standardize the construction, eliminate quality problems, and reduce the waste of labor, time and materials
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Today, from the aspects of steel construction preparation, material saving, detection, construction, anti-corrosion and acceptance, we summarize the key points of practical operation, full of dry goods: construction preparation 1
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During construction, we should be familiar with the construction drawings and relevant changes and other information, and fill in the audit records and changes in the corresponding positions in the construction drawings, so as to prevent mistakes during construction
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2
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After getting familiar with the construction drawing and not starting the construction, the steel bar lofting table shall be completed first, and the steel quantity and consumption plan shall be provided to the project department, and the problems occurred in the lofting process shall be timely reflected to the technical director of the project department
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3
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Cooperate with the foreman of the project department in technical disclosure and safety education at all levels
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4
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It is necessary to provide the work license of the operators of steel bar butt welding and vertical welding to the project department for filing, and complete the simulation welding test
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Actively cooperate with the project department to do a good job of steel material witness
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5
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All materials entering the site shall be classified, stacked and marked, and the materials that have not been inspected shall not be used
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Key points of material saving: 1
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In the purchasing stage, the actual use of raw materials, the scale of steel stacking yard, the existing surplus steel and materials on site should be considered comprehensively, so as to formulate the optimal steel purchasing plan, and select the appropriate steel length according to the blanking list and the actual situation of the site
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2
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The reinforcement processing shall be carried out in batches, and it is not allowed to make and bind one component by one, and each batch shall be a construction section not less than 30m long, so as not to affect the progress of the project, or cause a lot of waste of materials and serious idling
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3
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During construction, the heads of steel bars shall be cleaned up and classified according to the thickness and length, and they shall be placed in alignment at one end
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4
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During the construction, unified allocation management shall be carried out for the use of reinforcement, and a quota material requisition system shall be established, and the material distribution shall be carried out in strict accordance with the principle of “first in first out, old and new”
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5
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During the construction, long materials or intercepted long materials should be used first, and then the remaining short materials should be used reasonably, and the superior materials should not be used inferior
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If there is loss of reinforcement, it should be preferentially used for horse stool reinforcement, embedded parts, short hole reinforcement, etc., and the long and short end reinforcement can be welded together, so as to greatly save the amount of reinforcement
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6
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After construction, if there are surplus reinforcement heads or semi-finished products, the materials shall be registered and recorded, and the use of steel shall be checked regularly to check the loss rate, so that the next material selection shall give priority to the selection and use in the heads, and then the raw materials of reinforcement shall be selected
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Inspection points: steel source inspection (1) the construction unit shall issue the following quality certification documents: the original product certificate (the copy is limited to use and must be stamped with official seal); the original product record certificate (the copy must be stamped with official seal of the record enterprise); the production license number; and the inspection of whether the steel manufacturer is in the list of regular production enterprises issued by the local construction committee
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(2) It is necessary to check the following contents of this batch of reinforcement: product name, model, specification and brand; production date, manufacturer name, address, factory seal and production license number; technical data with certificates and seals of inspection personnel and inspection unit and mechanical and chemical properties regulations; standard name or code adopted; signs and attached tags on the surface of threaded reinforcement; certificate of quality and steel products The total quantity should not exceed 60t (one inspection lot)
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Appearance inspection of steel bars: (1) the surface of hot rolled steel bars shall be free of cracks, scabs and folds; (2) the wire rod is allowed to have indentation, local concave convex blocks, scratches and pockmarks, but its depth or height shall not be greater than 0.2mm; (3) the weight of iron oxide scale (rust) on the surface of steel bars shall not be greater than 16KG / T
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Reinforcement performance test (1) reinforcement performance test is mainly to test the mechanical properties and process properties of reinforcement before entering the site
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(2) The performance testing of reinforcement generally includes hardness test, tensile test, bending test, impact test, torsion test, welding joint inspection, welding procedure qualification and other testing items
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(3) Each batch of tested reinforcement shall not be more than 60t, and shall belong to the same brand, have the same shape, specification, production process, and be in the same delivery state
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Construction points 1
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During welding construction, dry and suitable welding rod, short arc and appropriate current shall be used as far as possible, and vertical welding shall be kept as far as possible to avoid excessive inclination
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2
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The welding site should have good wind, rain, snow and cold proof facilities
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When the construction environment temperature is – 20 ~ 5 ℃, corresponding technical measures should be taken to deal with it
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When the construction environment temperature is lower than – 20 ℃, welding construction is not suitable
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3
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When the steel bar joint is welded or tied by arc welding, it shall be made into double-sided weld as far as possible; when the steel bar joint is welded by overlapping arc welding, the overlapping end of two steel bars shall be bent to one side in advance to make the axis of two connecting steel bars consistent
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4
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When binding steel bars, all cross points of steel bars shall be bound, and the steel bars shall not be displaced
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Generally speaking, the foundation beam stirrups shall be bound with wrapping buckle, and the plate steel bars shall be bound with eight shaped buckle
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5
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The perpendicularity of wall reinforcement should be controlled by hanging wires, and the spacing of main reinforcement should be strictly controlled
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If double-layer reinforcement mesh is used, supporting iron (hook) should be set between two layers of reinforcement to fix the spacing of reinforcement
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6
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When binding the beam reinforcement, the number and spacing of the main reinforcement and stirrup shall be ensured, and the reinforcement shall not be missed
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7
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During construction, attention should be paid to the treatment of exposed thread length, and for taper thread or rolled straight thread joints, the joint length should be the length of sleeve and cane plus exposed thread at both ends
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Key points of anti-corrosion 1
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During construction, hot dip galvanizing anti-corrosion technology can be used to dip the workpiece to be plated into the zinc bath of molten metal for plating, so as to form a pure zinc coating on the steel surface and a zinc alloy coating on the secondary surface
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2
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During the construction, the surface of the hot-dip galvanized parts shall be smooth, without peeling, missing plating, dripping tumor, roughness, zinc thorn and residual solvent slag
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3
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When the arc spraying method is used for anti-corrosion construction, the relative humidity should be less than 85%
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4
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Vertical cross spraying (the spray gun is perpendicular to the workpiece) shall be adopted
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If vertical spraying cannot be carried out, the slope between the spray gun and the workpiece surface shall not be less than 45 degrees
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5
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When mechanical tools are used for painting and anticorrosion, the weather, temperature and humidity of the construction site should be considered, and the surrounding media should be selected for batching and viscosity modulation
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6
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During the construction, the paint shall be applied for 4-5 times, and the next coating shall be carried out after the paint is dried to 80% or completely dry
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7
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During the construction, the moving speed of the spraying machine should be reasonably controlled to avoid the blank spraying caused by the too fast moving speed of the spraying machine, or the accumulation and sagging of the paint surface caused by the too slow moving speed, which will affect the later drying time
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Acceptance points: 1
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Whether the connection area of column wall longitudinal reinforcement is staggered according to the specification, and whether the staggered distance meets the requirements; 2
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Whether the welding of column wall longitudinal reinforcement is vertical and full, and whether the joint quality meets the requirements; 3
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Whether the number of stirrups in the column beam stirrup densification area meets the requirements; 4
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Whether the beam column stirrup spacing and plate reinforcement are constructed according to the drawing, and whether the layout is uniform.
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