Precast stairs, rest and refuse to install process

Installation of stairs, rest and chute

1 scope

This technology standard used in building prefabricated reinforced concrete stairs and chute installation works.

2 construction preparation

2.1 materials and equipment:

2.1.1 reinforced concrete precast stair break, time sheet, single-flight stairs beam, waste and other components of the model, specification, quality, the design requirements, with a factory certificate.

2.1.2 cement: No. 325, Portland cement and ordinary Portland cement and slag Portland cement.

2.1.3 sand: sand.

2.1.4 fine stone: size 0.5~3.2cm.

2.1.5 steel: flat outline specifications. 40mmx6mm, angles ∠ 50x6mm specifications.

2.1.6 electrode: E4303, to have a factory certificate.

2.1.7 main machinery: crowbar, clasp, horns, hooks, slings, steel wedge, water change, horizontal hanging beam, chain, etc.

2.2 operating conditions:

2.2.1 components piling yard should be a solid formation, stacked pads when water close to the hook, wood thickness than the hook, and close to the hook. Wood, put it on the same vertical line.

2.2.2 quality checks before lifting the stair components, members who do not meet the quality requirements shall be used, and does not meet the requirements of component defects visible marks. Common identification and design units, to take measures to handle the negotiations, and after strengthening into a patch, can be used.

2.2.3 advance eject treads, resting on the wall plate, stair elements, such as beam lines, elevations and control up and down flights of stairs a horizontal distance and elevation to avoid when installing the treads, supporting long enough or the support length too short without it.

2.2.4 under first run, first floor stair tread the bottom of the casting section and elevation should comply with the design requirements of the drawing. Before you install the treads, must be installed in concrete strength of cast beams.

2.2.5 template for concrete walls set aside resting boards and stair hole cleaning and filling mortar by elevation.

2.2.6 building Board wall concrete strength 4MPa.

2.2.7 all components embedded parts removed in advance on Lomond, mortar and other remnants of embedded parts and surfaces clean.

3 operational processes

3.1 process:

→ Install the rest of mud water board welding crack → → → → install stair safety chute

3.2 water the mud; rest plate should be installed with the install in reservation location poured heavy cement, water/cement ratio is 0.5. And ensure rest and wall contact density.

3.3 Installing the resting plate: first check the installation location and elevation lines, installation sheet resting one end of stretcher slings should be higher than the other, so that he could rest tilting insert bearing hole. Slowly drop the rest Board lifting at the installation location, safe and after checking the surface elevation and location as per drawing requirements, with a crowbar and struck, equal to the size of both ends of the unit into the bearing.

3.4 stair installation: when installing a stair, by lifting one end of the sling chain adjustment on length DrawString, stepping surface level. Resting on the support surface water wet cement slurries and water/cement ratio is 0.5, support contacts close. Lax support when there is a void, to use iron wedges leveling, and density of cement mortar impaction.

3.5 welding: stair installation after the correction, according to the design drawings in a timely manner, with connection plate (size not smaller than the drawing specifications) flight and rest of embedded iron parts of surrounding weld, weld should be full, as shown in Figure 4-50.

Figure 4-50

3.6 crack: each floor stair installation finished, should be promptly break plates at both ends and the space between the wall formwork concrete. In-mould cleaning, concrete C20 fine stone concrete, vibrating compaction, and conservation.

3.7 chute installation:

3.7. more than 1 storey brick-concrete chute mounted on the inside corner, generally every layer break plates after installing or loading chute. The chute risers with connection plate welded plate on the upper and lower end embedded iron parts, welding firm. Vertical plate end plate joints with cement mortar block it. Central chute riser embedded parts and walls embedded iron welding.

3.7.2 high-rise structure of rectangular precast concrete chute, generally located at the stairs outside, with the construction schedule for installation of floors.

3.7.3 chute lift on the next cutting chute and catchy, lining up the temporary rings after grappling with the main structure.

3.7.4 by checking the location is accurate, straight up and down after no dislocation, welding can be carried out. Garbage between the road and the main structure, between the chute and chute of embedded iron parts, by binding of metal welding firm.

4 quality criteria

4.1 project:

4.1.1 hoisting structure concrete strength must comply with the design requirements and the provisions of the code.

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

4.1.3 joints (joints) of concrete or mortar must be accurate measurement, pouring dense and serious conservation should be, which must meet the design requirements or provisions of the code.

4.2 basic item: connection joints weld length shall conform to the design requirements, weld surfacing, no dents, welding, and joint crack and blowhole, slag and the undercut.

4.3 allowable deviation:

Stair installation allows distortions in the garbage

Offset to 10MM

Elevation 5mm

5 finished product protection

5.1 flight, rest should be taken forward lifting, transport and stacking. When components of transport and stacking, wood should be placed around the rings, and above the rings, and alignment. Chute straight vertical stacking.

5.2 piling yard should be flat and solid, the following Foundation Board. Stair duo pieces should not exceed 6, resting Board duo of not more than 10 pieces each.

5.3 stairs once installed, will still be protected in a timely manner to avoid construction of step-edge damage.

5.4 installation when resting boards and stair, not collision brick or concrete walls on both sides.

6 quality problems to be noticed

6.1 flight support bad: the main reason is false or lap support contact long enough. Install rest time to proofread the elevation, in addition to proofreading elevation when installing the stair, a diagonal length should also proofread the stair.

6.2 the stair set: mainly due to improper operation, install without pulp, put floating shelves, after you install the alignment fails to crack. Should be installed strictly in accordance with design requirements water slurry, filling in time after installation.

6.3 welding does not meet the requirements: Member connections only use short bar ends of spot welding, affect the overall performance of the structure. According to the design requirements, by binding of metal around the welding firm.

6.4 resting Board with a tread surface Cha level does not meet the requirements: the main reason comes to flat line, installation elevation does not meet the design requirements. Install rest panels should pay attention to height and horizontal position accuracy of the line.

6.5 junk not straight and trash mouth position do not meet design requirements: installation not in strict accordance with the design requirements the elevation in position and alignment.

6.6 flight about the reverse: be aware of when installing handrails embedded parts location.

7 quality records

This standard shall meet the following quality records:

7.1 component factory certificate.

7.2 cement factory certification and test reports.

7.3 test reports for sand and stone.

7.4 welding certificate.

7.5 pre inspection records.

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