Brick, outer tile internal model structure column and ring beam and slab reinforcement technology

1 scope

This technology is applicable to the brick structure, exterior brick structure of internal model construction column and circle beam and slab reinforcement technology.

2 construction preparation

2.1 materials and equipment:

2.1.1 steel bars: factory certification, the required mechanical properties of the second interview, when the brittle fracture occurred during exceptional circumstances, such as, the need for chemical composition test. Bars should be no old rust and oil.

2.1.2 wire, use of 20~22 wire (wire) or galvanized iron wire (wire).

2.1.3 control mortar for concrete pads, plastic card.

2.1.4 tools: steel hooks, crowbars, steel panels, tie racks, trolleys, wire brushes, chalk, rulers, and so on.

2.2 operating conditions:

2.2.1 according to the location of the construction site plan provisions, the steel pile site clean and neat, and ready for the wood. According to different specifications of models stacked and mat good wood.

2.2.2 checking reinforcement level, type, shape, size and quantity, and identical in design drawings and processed ingredients.

2.2.3 high elasticity and good lines and columns, concrete wall in the exterior brick outer skin line.

2.2.4 ring beam and slab template has finished the preflight, and clean up the mold.

2.2.5 the end of prestressed concrete hollow plate according to the standard map (96G44) requires blocking well.

3 operational processes

3.1 structure of column reinforcement:

3.1.1 technological process:

Constructional column of prefabricated steel skeletons → repair constructed protruding at the bottom reinforcement of column Tower →

Embedded column steel skeletons → lap banding position Stirrups

3.1.2 constructional column of prefabricated steel skeletons:

3.1.2.1 first two vertical reinforcement flat on the tie rack, and draw on the steel Stirrup spacing.

3.1.2.2 according to draw lines, hoop stress on the tendons by binding to set aside a lap length of the part. For the prevention of skeletal deformation, should adopt the anti-cross buckle and buckle fastening. Stirrup reinforcement should be kept perpendicular to hoop hook composite should be staggered along the direction of reinforcement placement.

3.1.2.3 wore two reinforcement and stirrup straps firmly, Stirrup straight length of the end not less than 10d (d is Hoop diameter), hook angle not less than 135 °.

3.1.2.4 column, column and ring beam reinforced part of the handover, according to design requirements should be encrypted column stirrup, encryption is normally in beam upper and lower storey shall be not less than one-sixth or 45cm, Stirrup spacing should not be larger than 10cm (column foot Stirrup Zhu encryption framework set up lap after binding).

3.1.3 trimming out structural columns at the bottom of lap bar: according to put the column line, check the lap bar and lap length comply with design and specification requirements. Underlying structural column vertical reinforcement and base ring beam anchorage; when there is no base beam, embedded in concrete-filled column base, Figure 4-2; when the wall attached to the trench, and structural column depth should be greater than the depth.

Figure 4-2

(A) basic beam and (b) non-Foundation beam

3.1.4 install structural column steel skeletons: Stirrups on his lap steel first, and then set up constructional column of prefabricated steel skeletons, are putting out the lap bars, lap times of not less than 35d, the elevation line, tied in the vertical reinforcement lapped parts 3 buckle. Skeleton-adjusted, can tie the root encryption Stirrups.

3.1.5 lap banding part of steel:

3.1.5.1 column reinforcement must be vertical and horizontal walls on each floor beam reinforcement of connections, forming a closed frame.

3.1.5.2 masonry brick wall when Ma ya Cha, 50cm along the wall the laying of two PHI 6 horizontal tie bar, with column reinforcement connection, as shown in Figure 4-3.

Figure 4-3

3.1.5.3 columns when setting in the absence of transverse walls, structural columns reinforced with in-situ or prefabricated beam beam end connection binding construct, in line with the multilayer brick and concrete reinforced concrete structure column earthquake resistance design and construction regulations (JGJ13-82) 3rd. the provisions of article 2.5.

3.1.5.4 masonry brick walls when you are finished, should trim the structural columns reinforced to ensure the reinforcement position and spacing to the exact.

3.2 steel banding:

3.2.1 the process flow:

Painted steel Stirrups → line → wear ring beams reinforced → lashing hoops

3.2.2 finished circle template and finish the pre-screening, lashing ring beam bars when using prefabricated skeleton, skeleton by number can be erected in position for Assembly. When such as in-mold banding, according to design drawings and spacing, the templates helped, Stirrup position line. Reinforcement Stirrups after wear. Stirrup lapping along the reinforcement should be staggered.

3.2.3 intersection of circle beam and constructional column reinforcement, lap steel should be placed inside of the structure column reinforcement. Beam reinforcement in constructional column positions overlap, his lap times or anchor into the column length should comply with the design requirements.

3.2.4 length of beam rebar lapped in line with the concrete structure engineering construction and acceptance specification (GB50204-92) for lapping of steel bar requirements.

3.2.5 beam reinforced each other, at the junction of walls, wall corner corner anchor length, to comply with the design requirements.

3.2.6 stairs, chimney shaft attached to wall, garbage road and the entrance beam reinforcing steel bar and other parts of the ring are blocked, should overlap the reinforcement and construction methods shall conform to the design requirements of different levels of high and low beam reinforcement should be overlapped or connected according to design requirements.

3.2.7 installed prestressed concrete hollow plate beam in the Gables, exposed tendons (that is, beard bar) in accordance with the standard Atlas of Jing 96G44 to anchor in beam reinforcing steel bar.

3.2.8 rebar tie after the blocks of cement mortar should be added to control reinforcement layer.

3.3 slab reinforcement

Process flow

Supporting sewing templates → precast prestressed anchorage reinforcement of the end bend 45 ° →

Full length horizontal structure reinforcement and and the end anchor bar binding

3.3.2 end joints template completed prescreening precast holes exposed tendons (bearded wheat) bent into a curved, two plates of prestressed cross exposed tendons, φ 6 level structure and tied a long bar and vertical tie bar, as shown in Figure 4-4.

Figure 4-4

3.3.3 to the plate in the middle of rebar connection on the bearing structure is shown in Figure 4-5.

Figure 4-5

3.3.4 when different steel structures on either side of the wall as shown in Figure 4-6.

3.3.5 prefabricated vertical seam reinforcement as shown in Figure 4-7.

图4-6 图4-7

3.3.6 construction column and circle beam and plate with slit after she finished tied, were asked to do covert project inspection, after passing the next procedure can be carried out.

4 quality criteria

4.1 project:

4.1.1 steel variety and quality must comply with the design requirements and the provisions of the relevant standards, chemical composition of imports of reinforcing bar welding must be done before inspecting and testing, comply with the relevant requirements before they can weld.

Inspection method: check the factory certificate and test report.

4.1.2 the bar surface should be kept clean, with a granular or flaky old rust, rust pitting of steel after, according to the original specifications is strictly prohibited.

4.l.3 of welding arc welding or welding splices, required to take samples, its mechanical performance test results must comply with the bar code for welding and acceptance of the rules.

4.2 Basic project:

4.2.1 steel banding and lack of clasp, tie loose quantity does not exceed 10% of buckle, and should not be set.

4.2.2 hook right, lashing fittings shall conform to the provisions of the code, which lap length is not less than the specified value.

4.2.3 in grade or steel, cold-drawn low-carbon steel wire produced by the Stirrups, its quantity, its angle and straight hook length shall meet the requirements of specification for design and construction.

4.2.4 no transverse to the welded cracks and burns, uniform welding package joint bending, not more than 4 ° axis displacement less than 0.1d, the month. not more than 2mrn. Arc welding, welds smooth surface, no dents, no overlap, joint crack and blowhole, slag and the undercut. Bent connector is not more than 4 ° steel axis displacement is not greater than 0.1d and less than 3mm. Seam thickness not greater than 0.05d, width not less than 0.1d, and not less than 0.5d.

4.3 allowable deviation, as shown in table 4-7.

Construction column and circle beam and slab reinforcement tolerance table 4-7

Project tolerance (mm) test method

1 frame width, height ± 5 foot check

2 frame length of ± 10 ' check

Distance ± 10

Distance ± 5

4 Stirrups, structural reinforcement pitch ± 20 feet three in a row, taking the maximum value

Center line 5

High levels of differential +3,-0

± 5 feet of reinforced protection layer of 6 check

5 finished product protection

5.1 structure column and ring beam steel prefabricated bones, should cushion neatly at selected locations.

5.2 floor hang shipped reinforcing bar storage should be clean good location to avoid deformation.

5.3 no Stampede strap steel tie beam steel beam and brick may not be touch loose.

6 quality problems to be noticed

6.1 deformation of steel: steel skeletons lashing should note the tie clasp, cross buckle and buckle fastening should be used.

6.2 Stirrup spacing does not meet the requirements: for when you place the wall tie bar touch, should die after the built up before finishing.

6.3 floor ending improper rebar connection: before the floor lifting the plate end exposed tendons bent at 45 °, hoisting followed by the full-length reinforcement. Also note that in the process of installing floors, exposed tendons of the end must not be broken.

6.4 at the balcony bar compressed: balcony beam under "l"-shaped hoops, lifting units must be protected, such as chipped, balconies should be lifted, after trimming reinforcement, and then seated balcony.

6.5 structure column out of steel bar displacement: in addition to the structural columns extend outside the bars and beam reinforcement tie and tied together at the extended bar positioned Stirrups, after you pour the concrete, should be trimmed immediately.

6.6 plate seam reinforcement exposed: longitudinal seams reinforced mortar blocks should be well tied, transverse seam to end steel tie plates on exposed tendons.

7 quality records

This standard shall meet the following quality records:

7.l steel quality certificate or test report form.

7.2 steel mechanical performance test report.

7.3 import steel chemical composition and solderability test report the test report, domestic steel processing occurs during cell broken, poor weldability and mechanical properties significantly abnormal, chemical composition inspection report.

7.4 bar section for quality inspection and assessment of information.

7.5 steel cover engineering acceptance record.

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