1 rebar straight thread connection

First, the main points of operation

1, steel bar blanking requires that both ends be straight, without horseshoe shape or deflection, and gas cutting is not allowed. Grinding wheel saw or toothless saw can be used on site.

2, processing steel thread, water-soluble cutting fluid should be used; Do not use oil lubricant or set wires without lubricant.

3. The thread heads that pass the self-inspection shall be randomly sampled by the quality inspector. Take the thread heads processed by one shift as an acceptance batch, and randomly sample 65438 00%. When the qualified rate is lower than 95%, the sampling should be doubled. When the re-inspection qualification rate is still below 95%, all the thread heads should be inspected one by one. Only qualified people can use it.

4. Check the diameter and length of the processed steel wire head with a thread gauge. Protective caps should be used to protect the thread ends that have passed the inspection. The effective thread length of the standard connector should not be less than 1/2 of the length of the connecting sleeve, and the allowable error is +2P.

5. The specifications of the steel bar are consistent with those of the connecting sleeve, and the model, pitch and external thread of the steel bar should match the connecting sleeve. And ensure that the thread of the steel bar connecting sleeve is clean and intact.

6. When connecting the steel bar, screw the steel bar into the connecting sleeve according to the axis. After the joint splicing is completed, the two thread heads shall be pressed against each other at the center of the sleeve, and the exposed threads at both ends shall not exceed two complete threads.

7. In order to prevent the joints from being screwed out, after each joint is tightened, it must be marked with red paint, and the unqualified joints should be marked with white for inspection.

Second, the quality effect

2 wall column plate reinforcement positioning

First, the main points of operation

1. According to the requirements of drawings and specifications, draw the processing drawings of trapezoidal positioning reinforcement, column reinforcement positioning frame, stirrup, cement lacing, etc. , processed or purchased after being audited by the technical director.

2. Before steel binding, vertical steel bars should be straightened and corrected in place. The wall reinforcement and ladder reinforcement of trapezoidal reinforcement shall be bound and fixed, and the vertical trapezoidal reinforcement spacing shall be no more than 2m, and each wall shall be no less than 2. The position of trapezoidal reinforcement should be within the overlapping length of reinforcement.

3, after the wall steel mesh binding, can be added with cement support and protective layer pad, cement support and wall reinforcement with tie wire tie, spacing should not be greater than 80cm, a plum blossom arrangement (or set the horizontal ladder reinforcement, spacing is not more than 2 meters and each wall is not less than 2); The protective layer pads shall be uniformly fixed on the steel mesh, and the spacing shall not be greater than 100cm.

4. The key of steel binding of frame column is to control the vertical and relative position of longitudinal main reinforcement. Add a steel bar positioning frame at 5cm and 50cm above the top surface of the floor. Before binding stirrups, limit the position of vertical reinforcement with a limit frame, and temporarily fix the limit frame with scaffolding to ensure that the limit frame is horizontal and corresponds to the column edge.

5, cast-in-place slab bottom reinforcement after laying stirrups, spacing is not more than 500mm, and with the upper plate reinforcement binding firmly.

Second, the quality effect

3 Shear wall reinforcement positioning

4- Positioning of reinforcement of column bottom plate

5 constructional column reinforcement reserved

First, the main points of operation

1, the bending anchor made of reserved reinforcement of constructional column meets the requirements of drawings and specifications; Welding quality assurance of embedded steel plate (and steel bar) at the top of constructional column.

2. According to the construction drawing, mark the position of constructional column with red paint on the completed template.

3, constructional column steel dowel and beam, plate steel binding is firm, take treatment measures when necessary, at least two sets of stirrups are set at the top to prevent steel dowel deformation.

4, the vertical reinforcement embedded at the bottom of the constructional column cannot be directly placed on the template to prevent exposure.

5, concrete pouring, collision is prohibited.

6, constructional column reinforcement protection measures in place.

Second, the quality effect

6 formwork support for post-cast strip

First, the main points of operation

1, the formwork support of post-cast strip must adopt an independent design system, which will not affect the installation and removal of full-house scaffolding, and the upper and lower vertical rods are placed coaxially, and the post-cast strip shall not be removed without concrete pouring; According to the clear position in the scheme, the floor passage is reserved to protect the surface of post-cast strip, which is strictly implemented in the implementation process.

2. The upper template of the cast-in-place slab post-cast strip template is consistent with the saw groove of the steel bar position, and it is installed firmly, or supported firmly with steel wire (plate) net, with wood square on both sides of the top, and the wooden template is completely closed and protected until it is opened when pouring concrete.

3. After pouring concrete on both sides of the post-cast strip on the basement roof, a horizontal platform is added, and the post-cast strip on the basement exterior wall is implemented according to the design scheme.

Second, the quality effect

7 concrete pouring process quality control

First, the main points of operation

1, quality control of commercial concrete factory inspection, mainly slump test.

2. Deliver the concrete in time (keep the information unblocked between the front desk feeder and the background construction personnel, and the concrete discharge should not be too concentrated), and vibrate the concrete (the vibrating rod shall control the moving distance of the vibrating point not to exceed 1.5 times the action radius of the vibrating rod, and the vibrating rod shall enter the lower layer 5cm, so that it can be inserted quickly and pulled slowly, and the vibrating rod shall be handed over properly to avoid vibration leakage).

3, concrete block production specifications, quantity meet the requirements.

4, concrete surface closing time and cohesion control within two to three times.

5, timely maintenance and protection after concrete pouring (morning load only).

Second, the quality effect

8 new concrete pouring maintenance control

9 cast-in-place structure quality inspection batch acceptance

First, the main points of operation

1, inspection and testing tools shall be equipped according to regulations, and personnel shall hold relevant certificates or have testing ability.

2, according to the specification requirements of the project (concrete strength, reinforced protective layer thickness, axis deviation, floor elevation; Section size, verticality, flatness) for testing and inspection, keep the original records, and make the site identification.

3. The quality defects of cast-in-place structure shall be treated according to the approved treatment scheme.

4, after the acceptance of cast-in-place structure, the elevation, axis, positioning identification and data on the wall, for the next working procedure or face handover.

Second, the process method

Quality control of 10 masonry construction process

First, the main points of operation

1, the ex-factory quality of the block meets the requirements of its 28-day age.

2. Wall positioning, measurement, pay-off and technical review meet the requirements, and the quality of Rachel reinforcement (connection with the structure, length, lap, etc.). ) is qualified.

3, the wall group build by laying bricks or stones method is correct, detailed specification, scientific and reasonable.

4, the secondary components (constructional column, ring beam) position accurately, steel binding, shuttering, concrete pouring specification is unified.

5, wall maintenance and acceptance and appraisal.

Second, the quality effect

1 1 masonry inspection, measurement and appraisal

12 waterproof project

I. Main control components and nodes

1. Basement: wall-penetrating pipe, post-pouring belt, construction joint, pile head, waterproof protective layer of external wall and deformation joint.

2. External wall: opposite bolt holes, reserved sleeves or reserved holes and deformation joints.

3. External windows: lower window, side window and upper window.

4. Rooms with water: waterstops under windows, sleeves, doors and bedding.

5. Roof: sewer pipe, facility foundation, roof structure, deformation joint and roof pipeline.

Part II Installation

1 Practice of reserving pipe holes and casings

1 construction technology:

Drawing hole diagram → hole location → technical review → hole formation → casing installation.

2 operating points:

Firstly, the comprehensive layout and planning of various pipelines are carried out to determine the pipeline coordinates, elevation positions and trends. The layout shall be drawn and confirmed by the owner, supervisor or designer, and the construction shall be carried out according to the drawings.

3, quality requirements:

Make sure the position and size of the hole are correct.

4. Look at the renderings:

2 waterproof casing embedded.

1 Construction technology: manufacturing casing → positioning and fixing → technical review → installation and molding.

Key points of operation: flexible waterproof casing or rigid waterproof casing are adopted according to the design, and the material, specification and size of casing are processed or purchased in the market according to the requirements of waterproof casing standard atlas; According to the coordinate size of the layout plan determined by the plan, tie or weld the structural reinforcement.

3. Quality requirements: All casings should be flush with the wall, and the casings off the ground should be 20mm higher than the ground (50mm for toilets and pipeline wells).

4. Look at the renderings.

3 Manufacture and installation of pipe supports and hangers

1 Construction technology: iron parts embedded and positioned → support fabrication → determination of horizontal elevation and spacing of supports and hangers → support installation and fixation.

2 operating points:

1) iron embedded support and hanger: follow the structural construction, and locate the embedded iron according to the coordinates, elevation and spacing of the planning plan; Determine the horizontal elevation of the support and hanger on the embedded iron piece, and weld the support and hanger on the embedded iron piece.

2) On-site expansion bolt fixing support and hanger: the strength and tension of the expansion bolt selected must ensure that the pipeline is firm, safe and reliable; Determine the spacing, elevation and coordinates of supports and hangers according to the layout.

3) Form of supports and hangers: According to the pipeline laying form in the design layout and referring to the requirements of indoor pipeline support and hanger atlas, determine the structural form of supports and hangers, and make them on site or in the factory. For special forms of supports and hangers or supports and hangers outside the atlas, calculations and rechecks shall be made, and qualified steel shall be adopted to ensure that the supports and hangers are firm, safe and reliable.

3 Quality requirements: The material, specification, model and structural form of supports and hangers must meet the requirements, with firm fabrication and welding, full and beautiful welds, firm installation and fixation, and satisfactory spacing. After the production is completed, derusting shall be clean and antirust paint shall be brushed twice.

4. For centrally arranged pipelines, it is recommended to use * * * supports to strengthen design optimization and construction planning. Look at the renderings:

4 the practice of welding steel pipes

1, construction technology: elastic line positioning → bending processing → buried pipeline → grounding jumper → protective measures.

2. Construction key points: According to the construction drawing, coordinates, elevation and direction, pay-off positioning is carried out to determine the location of junction box, which meets the design requirements after review.

3. Quality requirements: complete sets of pipe benders are used for bending steel pipes below SC25, and pipe benders or hot stewing methods can be used for bending steel pipes above SC32. The bending straightness of the pipeline should not be greater than 10% of the external diameter of the pipeline, and there should be no wrinkles, holes and cracks at the bend. The outer wall of welded pipe in masonry should be coated with antirust paint. The buried depth of concealed conduit is not less than 15mm from the surface of buildings and structures, and the clear distance of conduit used for fire control facilities is not less than 30 mm.

4. Look at the renderings:

1) catheter into the box

Note: JDG steel pipe is connected to the iron box with lock nuts. After insertion and positioning, use the fastening wrench to continuously tighten the set screw until the "neck" is broken, so that it becomes a whole without crossing the ground wire.

2) tube into the box.

Note: 1, common steel conduit grounding wire adopts cross welding method;

2. Galvanized steel pipe grounding wire adopts grounding wire card jumper mode;

3. Tighten the grounding wire of the thin-walled steel conduit into the box, lock the nut with the supporting claw, and unscrew the fixing screw of the pipe joint.

3) Pipe connection

Note: It is forbidden to butt weld metal conduit; Galvanized and steel conduits with wall thickness less than or equal to 2mm shall not be connected by sleeve fusion welding.

4) Power supply household management specification

Note: 1. The lead-in pipe of the directly buried cable through the wall must be waterproof, the buried depth should be not less than 700mm from the outdoor ground, and the waterproof gradient should be 5pp ~ 10pp.

2, embedded steel conduit grounding.

5) Tight pipe laying practice

Note: 1. Pipes laid in reinforced concrete walls and floors shall be firmly fixed with steel bars, and the distance between fixed points shall not be greater than 1m when laid in a straight line.

2. Straighten the catheter in the box and fix it with a special lock nut.

6) Pipeline grounding jumper

Note: 1, the jumper wire of galvanized steel pipe or flexible metal wire protection pipe should be connected by grounding wire clamp, and welding connection is not allowed.

2, across the ground wire specification table

7) plastic pipe out of the ground protection practices

Note: When laying plastic pipes, the bending should be reduced. When the straight line length exceeds 15m or there are more than three right-angle bends, a junction box shall be added. When the plastic pipe is laid horizontally in the large formwork wall, the distance between the fixed points shall not be greater than 0.5m, and the belt line shall be worn in time, and the nozzle, box mouth and box mouth shall be effectively blocked.

5 lightning protection grounding

1. Construction technology: construction preparation → installation of grounding device → down lead → equipotential connection.

2. Key points of construction: The materials used for lightning protection and grounding must be hot-dip galvanized products.

3. Quality requirements: According to the size and location requirements of the design drawings, the grounding device will weld two main structural steel bars in the bottom plate and connect them with related steel bars (such as pile foundation steel bars). The weld shall not have defects such as slag inclusion, bite, crack, virtual welding and porosity.

4. Look at the renderings.

1) plate reinforcement and pile foundation grounding device

2) Conventional practice of using vertical structural main reinforcement as lightning protection downlead (according to design or local regulations)

Note: Use the main reinforcement of the building as the underground laying down lead: When the rebar diameter is 16mm or above, two rebar (binding or welding) should be used as a set of down lead, and when the rebar diameter is 10mm or above, four rebar should be used as a set of down lead.

3) Measuring point method Note: 1, artificial grounding devices or grounding devices using building foundation reinforcement must set measuring points above the ground according to the design requirements. 500mm from the ground when the design is not required.

2. The grounding resistance value of grounding device must meet the design requirements.

3. The reserved conductor of 0.8m ~ 1m under the outdoor terrace is connected to the external artificial grounding body.

4) The reserved point method for equipotential bonding of metal steel window (bridging with the window is completed by a professional company).

Note: The metal frame of curtain wall and the metal doors and windows of the building designed for grounding should be reliably connected to the grounding trunk line nearby, and measures should be taken to prevent electrochemical corrosion between different metals at the joint.

5) local equipotential method in toilet

Note: 1. There is no PE line in the bathroom, and the local equipotential connection in the bathroom shall not be connected with the outdoor PE line. There is a PE line in the bathroom, and the local equipotential bonding in the bathroom must be connected with this PE line.

2. Hidden equipotential bonding lines and their joints shall be recorded, and their actual direction and position shall be indicated on the as-built drawings.

6) Seal with temporary cover plate to prevent pollution (other boxes should also be protected in this way).

The third part of the model

1 On-site exhibition area model

First, the main points of operation

1. The location of the site shall be uniformly planned during the plane layout, and the maintenance facilities shall be closed up and down around the exhibition area, with directions and signs.

2. The built-in physical model should be planned as required, and the location should be arranged reasonably. Production standards should be standardized and scientific, in line with national, local and company standards.

3. Materials and samples shall be displayed in categories and clearly marked.

4, easy to show, watch communication, training and disclosure.

Second, examples

Entity template management on the 2nd floor

First, the main points of operation

1, the floor entity template should be implemented in strict accordance with the implementation plan template list, planned and selected in advance, and equipped with guide card or identification plates.

2. The entity template should strictly follow the principle of template guide and template guide, and be implemented by subordinate teams in accordance with the requirements of technical disclosure of construction operations, and complete the acceptance of working procedures and finished products.

3, the entity model area should do a good job in zoning, acceptance data, technical standards and management requirements of the identification signs, the content is standardized, detailed, illustrated, easy to visit and learn, training, disclosure, easy to understand.

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