Prefabricated balconies, rain cover, channel plate installation process

Prefabricated balconies, rain cover, channel installation

1 scope

This technology is applicable to General residential buildings prefabricated reinforced concrete balconies, rain cover, channel plate components installation works.

2 construction preparation

2.1 materials and equipment:

2.1.1 widget: prefabricated reinforced concrete balconies, rain cover, channel model, quality should meet the requirements of the Board. And should have the widget factory certificate.

2.1.2 cement: No. 325 more than Portland cement and ordinary Portland cement and slag Portland cement. Factory certified.

2.1.3 sand, stone: sand or coarse sand particle size 0.5~3.2cm stones.

2.1.4 concrete admixtures: early-strength admixture, superplasticizer, etc should be consistent with the relevant provisions of the standard. Content determined by the laboratory.

2.1.5 electrode: grade ⅰ E4303 electrode for steel welding, welding ⅱ E5003 or E4303 for steel rod, factory certified.

2.1.6 anchor reinforcing bars: specification, variety and size requirements are commensurate with widget sets.

2.1.7 wire: wire, 20th.

2.1.8 supporting materials: 100mmx100mm wood stud or tool-steel pillars, 50mmx100mm wood Rod 50mm Atsugi base plates, wooden wedges and nails.

2.1.9 main machinery: crowbar, hooks, slings, clasps, steel wedges.

2.2 operating conditions:

2.2.1 installed before the widget and pop-up widget size overhang on the walls and on both sides of the line of control border, checking level.

2.2.2 cut and straightened the balcony edge welded connction and embedded within the corridors ring ribs.

2.2.3 check balcony anchorage reinforcement of cantilever beams and boards on both sides of the aisle out of the diameter and length of exposure in accordance with design requirements and left bars straighten.

2.2.4 Installing balcony, rain cover, MCP brick walls with cement mortar or concrete wall and catchy elevation leveling.

2.2.5 balcony, rain cover, temporary support channel plates should have sufficient strength and stability. Put scissors at the pillar, wall jambs and horizontal tie firmly. Before installing should copy the temporary support to the top flat, wedge a nail and plate nailed at the bottom. When lifting the upper balcony or walkway, following at least three layers of support.

3 operational processes

3.1 process

Pulp adjust welding → → → → hoisting poured concrete

3.2 pulp: install components before his screed the walls clean and water cement ratio is 0.5 grain slurry with a layer, then installed, to ensure that members and leaving no gap between the wall.

3.3 lifting: lifting component when making each hook load lifting rope angle should not be less than 45 ° with the plane. When components hang suspended from slightly higher than the flat on the floor, place unit on the wall on the sideline, and then according to the line size overhang, determine the wall gently firm (such as design requirements, pressed into a wall not less than 10cm), pick out the parts placed on the temporary support.

3.4 adjustment component dislocation spotted when using crowbars pad gently move out of wood, adjust the components to the correct location. The layers already installed balcony, channel up and down vertically, horizontally straight, consistent elevation.

3.5 welding anchor bar: the component in place should be reserved on the inner edge beam ring ribs to straighten and beam reinforcement. Lateral beams protruding bar should also lap welding anchor bar, anchorage reinforcement type, size, length and length shall meet the requirements for design and component standards set. Electrode types should comply with the design requirements, double-sided weld, weld length ≥ 5 times the anchor bar diameter. Weld quality inspection in line with requirements, go through the preflight procedures. Anchor bar anchor into the wall or in a circle, as shown in Figure 4-51.

Figure 4-51

3.6 concrete: a balcony overhanging welded steel finish, inner ring ribs and ring beam reinforcement through the balcony, and inspected the hidden check formalities, and ring beam pouring concrete at the same time. Prior to pouring concrete, die within the clean water the wood template should run mode, dynamic reinforcement of vibrated concrete pay attention not to touch, vibration after compacting, followed with a wooden sock erase beam surface (pay attention to the upper surface of the beam elevation lines). Channel installation joints should be uniform, Board templates, tags should be strong, sew with fine stone concrete, vibrating compaction, concrete strength grade to meet the design requirements.

4 quality criteria

4.1 project:

4.1.1 lifting the concrete strength of the Widget, you must meet the requirements of specification for design and construction.

Type, location, point 4.1.2 component anchoring must comply with the design requirements and no damage.

4.1.3 prefabricated balconies, rain covers, walkway paving mortar must be dense at the bottom, without pores. Channel width gap between panels to meet the design requirements.

4.2 Basic project

Anchorage bar lap length should comply with the requirements of 4.2.1, welds smooth surface without cracks, dents, welding tumor, pores, defects such as ash and undercuts.

4.2.2 balconies for each line should be aligned with the above and below the balcony slab edge.

4.3 allowable deviation, as shown in table 4-41.

Table 4-41

Project tolerance (mm) method

Plaster 5

Don't plaster 3

Horizontal deviation of 10

5 finished product protection

5.1 components overlap when stacking wood should be added, to make the rings will not be crushed, wood thickness should be not less than 90mm, and upper and lower wood should be vertical. Piling yard should be flat and solid. Stacked no more than 10 blocks each component.

5.2 cut embedded tick embedded iron and steel parts, damage components.

5.3 transport and installation process, exposed steel bars shall be arbitrarily cutting components.

5.4 when the component is installed, not chipped brick walls or concrete walls.

6 quality problems to be noticed

6.1 installed: temporary support on top of cement mortar and screed must be on a level surface.

6.2 position is inaccurate: the installation must be according to the line of control and the elevation is in place, if any deviation should be adjusted in a timely manner.

6.3 bearing false: formation of the screed should be noticed, installation should be watered pigment cement slurry, still pore is installed, using dry real hard mortar.

6.4 anchorage reinforcement length and lap welding does not meet the requirements: because any bend off balcony exposed steel bars, which anchoring length is not enough. Anchorage used lap welding, the weld on both sides should be used, it seems sometimes to one-side welding, resulting in anchorage or welded length is not enough.

6.5 anchorage bars are not into a wall or beam: when installing components position is not accurate, anchoring bars and concrete walls to stagger. Lifting should be according to the position line in place.

6.6 balcony not vertical, channel up and down: the main reason is that no line in place by location when you install.

6.7 seam seepage under the balcony, MCP: as there are no serious waterproofing treatment. After installing shall keep the outside seam 3cm wide pad scrape pulp, waterproof according to the design process. Gap between the channel plate must be of fine stone concrete compacting.

7 quality records

This standard shall meet the following quality records:

7.1 component certificate.

7.2 steel factory certification or inspection reports.

7.3 steel mechanical performance test report.

7.4 tensile test for welded joint report.

7.5 cement factory certification and test reports.

Sand 7.6 test report.

7.7 welding certificate.

7.8 bar hidden inspection records, component installation inspection records.

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