At present, the momentum of China's construction industry is still very strong, and the engineering quality is very important. For our construction workers, we just need to remember this slogan: excellent engineering quality must first be carefully constructed!
(1) reinforcement engineering
1. Reinforcement binding of ground beam:
Practice standard:
1, elastic line controls the spacing between main reinforcement and stirrup;
2. Cement pad is used at the bottom, and plastic or other pads are used at both sides of the beam to control the thickness of the protective layer;
3. The binding wire is bent to the inside of the beam.
Quality standard:
1, the specification and quantity of steel bars meet the design requirements;
2. The allowable deviation of rebar spacing is within 10mm; The allowable deviation of row spacing is within 5 mm; The allowable deviation of stirrup spacing is within 20mm; The allowable deviation of protective layer thickness is within 5 mm;
3. Tie the thread without leakage, and tie the thread in.
2. The underlying steel binding template:
Practice standard:
1, play line on the ground to control the main reinforcement spacing;
Quality standard:
1, the specification, quantity and spacing of steel bars meet the design requirements;
2, protective layer thickness deviation shall not be greater than ±65438±00mm, steel bar shall not contact with the bottom plate or side form, in case of water seepage and corrosion;
3. The allowable deviation of the length, width and spacing of the reinforced fabric is within 10mm; The allowable deviation of mesh size is within 20mm; The allowable error of stirrup spacing is within 20mm;
4. Measure the flatness of the upper row of steel bars with a level not greater than 5 mm/2m to ensure the thickness of the protective layer of steel bars;
5, binding thread without leakage, wire without bending.
3. Reinforced sleeve connection template:
Practice standard:
1, steel bar is cut by toothless saw, and the end face is straight;
2. The steel sleeve is qualified, the steel thread is full, and there are no defects such as broken teeth and bald teeth. After thread processing, it should be protected by protective sleeve;
3. The sleeve is connected with a torque wrench, and the tightening torque value meets the specification requirements;
4, check one by one, after passing the paint.
Quality standard:
1, reinforced end should be perpendicular to the axis, can not have horseshoe or deflection;
2. The tightening torque value of the torque wrench meets the specification or design requirements, and the torque wrench accuracy is15%;
3. After connection, no more than one complete wire can be exposed at each end;
4, two interconnected steel ribs should be in a straight line.
(2) Formwork project
1. wooden formwork installation formwork:
Practice standard:
1, template joints should not leak slurry; Adopt hard flat-fell seam;
2, template should besmear brushs isolation agent before use;
3, template installation deviation should comply with the rules and regulations.
The latest practical data of "example leading"
Quality standard:
1, comprehensively check the formwork joints and release agent coating;
2. After the template is installed, check the allowable deviation of the template: the axis position is within 5mm; Section size: +4 mm to -5 mm;
3, adjacent template surface height difference allowable deviation within 2mm; Surface flatness should not be greater than 5 mm;
4. Roof formwork shall be arched according to the span11000 ~ 3/1000.
2. The bottom of the template support template:
Practice standard:
1, steel pipe fasteners used must have quality certificates;
2, the template at the bottom of the primary and secondary keel specifications, spacing comply with the design requirements;
3, the roof stud to keep in the same straight line;
4, when setting up the stud, in order to prevent the lower floor concrete crush, the bottom of the stud must be padded with square blocks;
5, vertical pole and horizontal pole should comply with the design requirements;
Quality standard:
1, all kinds of steel pipes are welded steel pipes with an outer diameter of 48mm and a wall thickness of 3.5mm and have quality certificates;
2, the use of steel pipe can not have deformation, welding, cracks and other defects, and do rust prevention treatment;
3. All fasteners used shall be inspected, and there shall be no defects such as air holes, sand holes, cracks and slippery threads, and there shall be quality certificates;
4, sweeping the floor at the bottom of the pole is generally controlled within 500mm from the ground, the upper set of crossbar, central set of waist pole, to prevent the stud instability;
5, according to the calculation results, in the larger span or girder parts, in order to prevent local instability, bracing should be set;
6, at the bottom of the stud pad with 50 mm * 100 mm short wood square, the length is more than 20cm.
(3) Concrete engineering
1. Reinforced concrete beam-column joint template:
Practice standard:
1, the strength grade of structural concrete must meet the design requirements;
2, the structure size must be consistent with the design drawings and change negotiations;
3. Specimens used to check the concrete strength of members shall be randomly selected at the concrete pouring site, and the sampling and specimen retention shall meet the specification requirements.
Quality standard:
1, the concrete appearance has no quality problems such as exposed reinforcement, honeycomb, holes, slag inclusion, looseness, cracks and appearance defects;
2. Allowable deviation of structural dimensions: axis: 5 mm; Verticality: 8 mm ≤ 5 m; 10mm greater than 5m; ; Elevation:10mm; Section size: ++8mm,-5mm; ; Surface flatness: 8 mm.
2. Reinforced concrete shear wall template:
Practice standard:
1, the strength grade of structural concrete must meet the design requirements;
2, the structure size must be consistent with the design drawings and change negotiations;
3. Specimens used to check the concrete strength of members shall be randomly selected at the concrete pouring site, and the sampling and specimen retention shall meet the specification requirements.
Quality standard:
1, the concrete appearance has no quality problems such as exposed reinforcement, honeycomb, holes, slag inclusion, looseness, cracks and appearance defects;
2. Allowable deviation of structural dimensions: axis: 5 mm; Verticality: ≤5m, with allowable deviation of 8mm；; Verticality > 5m, allowable deviation10mm; ; Elevation:10mm; Section size: ++8mm,-5mm; ; Surface flatness: 8 mm.
(4) waterproofing of basement coil
Waterproof template for basement coiled material:
Practice standard:
1, basic treatment, besmear brushs priming oil;
2, according to the specification requirements set up additional layer;
3, coil shop is stuck;
4, coil after the shop is stuck, timely pouring protective layer, to ensure the quality of finished products.
Quality standard:
1, the base is firm, smooth, free of floating dust, and the priming oil is evenly coated, without flowing or showing the bottom;
2, additional layer width of 50 cm or more; Sleeve at the angle of yin and yang and the root of the tube;
3. The lap length of the long and short sides of the coil is ≥10cm; Lap seam tight, no wrinkles, warping and empty drum;
4. The thickness of protective layer meets the design requirements.
(5) Masonry structure
1. Aerated concrete block wall template:
Practice standard:
1, before laying, all kinds of brick materials should be wetted with water in advance according to the corresponding requirements;
2, elastic line control masonry position; Control the number of building blocks with the number of leather poles;
3, masonry mortar joint is full, and the top inclined brick is dense;
4. The sill is made of sintered common brick or perforated brick, and the sill of rooms with waterproof requirements such as bathroom and kitchen needs to be poured with concrete.
Quality standard:
1, allowable deviation of masonry axis displacement:10mm; ; Allowable deviation of masonry verticality: 5 mm; Allowable deviation of surface flatness: 8 mm;
2. Mortar plumpness: horizontal joint ≥90%, vertical joint ≥ 80%;
3. Width of mortar joint: 8mm ~12mm; Mortar joint of pressurized steam block: horizontal:15 mm; ; Vertical: 20mm；;
4. The height of the stands should not be less than 200mm. ..
5, Rachel reinforcement into the wall should not be less than1000 mm. ..
2. The constructional column template:
Practice standard:
1, constructional column lien position, steel bar specification, spacing, etc. Meet the design requirements;
2. The constructional column should be poured tightly, and the strength should meet the specification requirements;
3, the constructional column of brick masonry should be set in accordance with the provisions.
Quality standard:
1, and the dimension of the post position wall retreat is 6 cm;
2. When supporting the constructional column template, double-sided adhesive tape should be pasted along the position of Ma Yacha to prevent slurry leakage; Structural column formwork support should be connected with tie rods, and it is forbidden to open holes in masonry;
3. There are no quality defects such as exposed reinforcement and honeycomb pits on the concrete surface of the constructional column.
3. Prefabricated lintel formwork:
Practice standard:
1, precast lintel length, section size, steel specifications and spacing should meet the design requirements;
2. Precast lintels should be poured tightly, and the strength meets the specification requirements;
3, lintel installation should control positioning.
Quality standard:
1, lintel before installation should check whether its strength meets the design requirements;
2, transportation lintel, both ends should add stow-wood, to prevent damage to components;
3. When the lintel is installed, the positioning size should be controlled by elastic lines at both ends of the lintel, and the supporting points at both ends are consistent in length and meet the design requirements; The latest practical data of "example leading"
4. When installing lintels and beam pads, the elevation, position and model must be accurate and the ash should be full. If the ash thickness exceeds 2cm, pisolite concrete should be paved.
(6) Key points of construction area display
Sampling first:
1. Require the general contractor to require the construction of the construction method model area.
2. The general contractor shall be responsible for the method training for each labor team.
3, the project company engineering department and supervision records, supervision records.
Construction method template construction:?
Clear control points;
Standardize node details;
The project department, the supervision unit and the owner shall implement it after passing the acceptance.
Construction method template training disclosure:
Conduct training disclosure on construction method templates for all labor teams entering the site;
Combined with visual revelation;
(7) Demonstration of construction method model area
Craft Exhibition: Frame Structure Template
Process description: the horizontal spacing of scaffolding is 1 100, and the scaffolding at the bottom of the beam is 300 meters away from the beam edge. The length of the beam-column joint encryption zone is 750, and the long stirrups are arranged on the plate with a spacing of 800.
Process display: core tube support template
Process description: the size of wood square is 50X 100, and the spacing is not more than 250. The horizontal spacing of opposite pulling screws is 450, and the vertical spacing of steel pipes is 600. In addition, opposite pulling screws are set to reinforce the corners of the shear wall.
Process demonstration: rigid column structure template
Process description: the length of the beam-column joint encryption zone is 900, and the rigid column stirrups are splayed stirrups, the size is 50X 100, and the spacing is not more than 250. Column formwork is fixed with channel steel and opposite screw.
Process display: plastering template, external wall internal insulation template, external wall coating template.
Process description: hanging mesh between different materials for plastering, the hanging mesh boundary is 100, the size of ash cake is 50X50, and the spacing between ash cakes is not more than 2m. Coating and heat preservation are carried out in layers to ensure the visual effect.
(8) Display of material sample area
The contents of the exhibition include: material name, specification, brand, manufacturer and main technical parameters.
Exhibition contents: stirrup formwork, hook formwork, electroslag pressure welding head, straight thread sleeve connection, copper hot water pipe, stainless steel water supply pipe and box formwork.
Material storage yard, neatly planned and clearly classified.
(9) solid model display
Reinforcement binding entity template: when the slab is double-layer reinforcement, reinforcement stirrups must be added between the two layers of reinforcement to ensure the position of the upper reinforcement, all intersections of the upper reinforcement should be bound, and every intersection of negative moment reinforcement should be bound. The protective layer at the bottom of beam and slab shall be padded with finished mortar pad.
Concrete solid model of beam, slab and column: Strictly control verticality and flatness to ensure visual quality.
Masonry: a small hollow concrete block with three solid bricks or cores at the bottom of the lightweight block. Before sealing the secondary structure, double-sided adhesive tape should be attached to prevent slurry leakage, and the mortar laid obliquely on the top brick should be full. The latest practical data of "example leading"
Roof brick formwork: the mortar joint of roof brick should be uniform and controlled at 8 ~10 mm; Set a 37.5px separation seam every 6m, and fill it with weather-resistant glue.
Electromechanical basement: the formal fire hydrant system in the basement presses water in advance, and the combination of permanent and temporary fire hydrant box is adopted in the decoration and installation stage.
(10) site civilized construction and safety protection
Through the visual technical disclosure activities, Qingxiu Wanda and other construction sites have achieved tangible results. Nanning Urban and Rural Construction Committee carried out visual technical disclosure in Qingxiu wanda plaza project, which enabled workers to form good behavior habits imperceptibly, have a clearer understanding of on-site operation sequence and technology, reduce errors, and thus improve construction quality;
1. Architectural cultural corridor;
2. Exquisite website "four-character classic" formula color pages and public service advertisements;
3. Standard Atlas, which consists of examples of local standardization practices;
4. Building technology demonstration room;
5. Animation of technical disclosure;
The entrance of the elevator shaft door shall be provided with a fence protection door, which is a metal fence door with a height of not less than 1.2m, and the fence door shall be painted in red and white. And in the lower part of the door set up 200mm high skirting board, brush red and white paint.
When there is no enclosure structure around the edge of the frame floor, two or three protective railings must be set, the height of the protective railings should not be less than 1.2m, the spacing between the vertical poles should be 1.5m, and a dense mesh safety net should be hung.
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