CN104712088A - Construction method for post-poured concrete of prefabricated composite floor slabs - Google Patents
Construction method for post-poured concrete of prefabricated composite floor slabs Download PDFInfo
- Publication number
- CN104712088A CN104712088A CN201510041680.6A CN201510041680A CN104712088A CN 104712088 A CN104712088 A CN 104712088A CN 201510041680 A CN201510041680 A CN 201510041680A CN 104712088 A CN104712088 A CN 104712088A
- Authority
- CN
- China
- Prior art keywords
- concrete
- construction
- cement
- sand
- floor
- Prior art date
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- 239000004567 concrete Substances 0.000 title claims abstract description 89
- 238000010276 construction Methods 0.000 title claims abstract description 36
- 239000002131 composite materials Substances 0.000 title abstract 4
- 239000004576 sand Substances 0.000 claims abstract description 27
- 239000000835 fibers Substances 0.000 claims abstract description 21
- 239000004743 Polypropylene Substances 0.000 claims abstract description 20
- -1 polypropylene Polymers 0.000 claims abstract description 20
- 229920001155 polypropylenes Polymers 0.000 claims abstract description 20
- 239000000463 materials Substances 0.000 claims abstract description 14
- 238000003756 stirring Methods 0.000 claims abstract description 7
- 239000011398 Portland cement Substances 0.000 claims abstract description 6
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 6
- 239000011575 calcium Substances 0.000 claims abstract description 6
- 239000011901 water Substances 0.000 claims description 28
- 239000004568 cements Substances 0.000 claims description 25
- 239000004575 stone Substances 0.000 claims description 15
- 239000011499 joint compounds Substances 0.000 claims description 12
- 239000003795 chemical substances by application Substances 0.000 claims description 10
- 239000004744 fabrics Substances 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 230000015271 coagulation Effects 0.000 claims description 6
- 238000005345 coagulation Methods 0.000 claims description 6
- 239000002994 raw materials Substances 0.000 claims description 6
- 238000009490 roller compaction Methods 0.000 claims description 6
- 235000011194 food seasoning agent Nutrition 0.000 claims description 5
- 238000005755 formation reactions Methods 0.000 claims description 5
- 239000003638 reducing agents Substances 0.000 claims description 5
- 239000002689 soil Substances 0.000 claims description 5
- 150000001669 calcium Chemical group 0.000 claims 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N calcium Chemical compound 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[Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 abstract description 5
- 238000005336 cracking Methods 0.000 abstract description 3
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- 239000002245 particles Substances 0.000 abstract 1
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- 238000005516 engineering processes Methods 0.000 description 2
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- BVKZGUZCCUSVTD-UHFFFAOYSA-N Carbonic acid Chemical compound 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Abstract
Description
Technical field
The present invention relates to a kind of construction material and method, in particular, a kind of method that after relating to Prefabricated stacking floor, pouring concrete is constructed and material.
Background technology
Prefabricated stacking floor is the assembled integral floor be formed by stacking by precast plate and cast-in-situ steel reinforced concrete layer, and floor divides two-layer construction, and lower floor is the Prefabricated stacking floor with reinforcing bar, and upper strata is the cast-in-place concrete structure of after-pouring, two-layer jointly stressed.Laminated floor slab good integrity, can save template, and the soffit of plate is smooth, is convenient to finish coat finishing, is applicable to the higher highrise building of integral rigidity requirement and large bay building.But in the construction of partial precast laminated floor slab, there will be large span floor splicing, plate-girder overlap joint, board wall overlap joint, part concrete thickness is watered general thinner after adding, in part layout design, in plate, reinforcing bar is intricate, local cracks can be produced, the situation that the splicing especially between Span Slab, plate-girder overlap joint and board wall overlapping part more easily produce cracks on floor slab and occur that floor leaks, seep water after causing concrete floor slab placement shaping.
After Prefabricated stacking floor, pouring concrete generally adopts ordinary concrete, and ordinary concrete waters in part after being applied in Prefabricated stacking floor may exist following problem: 1, ordinary concrete crack resistance inadequate natural endowment.Due to the chemical shrinkage in concrete coagulation sclerosis, plastic shrinkage, dry contraction, temperature shrinkage etc., form more crack or defect therein, easily cause seepage.2, part concrete thickness is watered after Prefabricated stacking floor less, as construction method adopts improper very easily generation crack and other quality problems.3, the problem of concrete production and quality control on construction aspect is mainly manifested in: the 1. problem of concrete match ratio quality aspect.Not strict implement match ratio; It is improper to control raw material mud content, and mud content is often higher and containing more clod; During material metering, deviation is large; 2. the problem of operational quality aspect.During by steel roller compaction, steel drum weight is less than normal, and the compacting time is inadequate, can not ensure concrete compaction; Maintenance measure is insufficient, and curing time is too short; Do not accomplish timely press polish etc.; 3. plate, beam steel position problems.In part construction, misplace of rebars or absolute altitude mistake cause Prefabricated stacking floor concrete vibrating and protective layer thickness control aspect existing problems.Above question synthesis gets up to cause the situation that Prefabricated stacking floor assembles, serious leakage appears in pouring construction after completing, and brings huge loss.
Water part concrete construction after traditional Prefabricated stacking floor and will ensure that construction quality just needs constructor correctly to go constructing operation according to construction technical requirement, and in fact the human-subject test of constructor and constructing operation level general not high, therefore, the material selection of pouring concrete after Prefabricated stacking floor itself and the selection of construction method are seemed particularly important, suppress the defect of material itself, constructing operation can be made easier, more easily ensure construction quality, thus reach the situation avoiding Prefabricated stacking floor to occur seepage.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, and provide one to prevent Prefabricated stacking floor from building rear seepage, cracking, simple to operate, improve efficiency of construction, the construction method of pouring concrete after a kind of Prefabricated stacking floor of reduction construction cost.
A construction method for pouring concrete after Prefabricated stacking floor, comprises the following steps:
Step 1 concrete batching
Select stone mud content to be not more than 1%, sand mud content is not more than the concrete raw material of 2%, and regulate the mass ratio of coagulation water in soil and cement to be not more than 0.38, sand mass content in cement is 45%-48%;
Step 2 ready-mixed concrete
First add stone and sand in mixer and stir 40-50 second, add cement and water reducing agent and stir 80-100 second, slowly add water again and stir 110-130 second, then after polypropylene fibre being added to the water Homogeneous phase mixing, point two parts add mixer stirring, the last expansion agent that adds in mixer stirs, and controls to stir to be no less than 240 seconds total time;
Step 3 concrete pouring construction
Build in floor splicing, plate-girder overlap joint, board wall lap-joint the concrete that step 2 stirs, lay alkaline-resisting grid cloth along piece, vibrated concrete during concreting, then use steel roller compaction concrete;
The maintenance of step 4 concrete formation
Need after concreting, according to temperature situation, to carry out water seasoning and covering in time.
Described cement adopts 42.5Mpa level Portland cement, and described sand adopts II district's medium sand, and described cobble-stone diameter is 5-31.5mm.
In described step 2, polypropylene fibre and concrete mass volume ratio are 1Kg:0.9m3, and expansion agent and concrete mass volume ratio are 50Kg:0.9m3.
Described polypropylene fiber filaments diameter is 9-13um, length is 12-19mm.
Described expansion agent is calcium sulphoaluminate type cement expansive material.
The width that in described step 3, alkaline-resisting grid cloth is laid is piece width twice.
The invention has the beneficial effects as follows: (1) construction technology of the present invention is simple, easy to use; (2) the present invention uses material price cheap, excellent performance; (3) construction method of the present invention effectively prevents Prefabricated stacking floor piece seepage, cracking, increases the intensity of laminated floor slab splicing, ensures construction quality.
Detailed description of the invention
The invention will be further described below.
A construction method for pouring concrete after Prefabricated stacking floor, comprises the following steps:
Embodiment 1
Step 1 concrete batching
Select stone mud content to be not more than 1%, sand mud content is not more than the concrete raw material of 2%, and regulate the mass ratio of coagulation water in soil and cement to be not more than 0.38, sand mass content in cement is 45%-48%;
Step 2 ready-mixed concrete
First stone is added and sand stirs 40 seconds in mixer, add cement and water reducing agent stirs 100 seconds, slowly add water again and stir 120 seconds, then after polypropylene fibre being added to the water Homogeneous phase mixing, point two parts add mixer stirring, described polypropylene fiber filaments diameter is 9-13um, length is 12-19mm, the last calcium sulphoaluminate type cement expansive material that adds in mixer stirs, and controlling to stir total time is 250 seconds;
Step 3 concrete pouring construction
Build in floor splicing, plate-girder overlap joint, board wall lap-joint the concrete that step 2 stirs, lay alkaline-resisting grid cloth along piece, the width that alkaline-resisting grid cloth is laid is piece width twice, vibrated concrete during concreting, then uses steel roller compaction concrete;
The maintenance of step 4 concrete formation
Need after concreting, according to temperature situation, to carry out water seasoning and covering in time.
Described cement adopts 42.5Mpa level Portland cement, and described sand adopts II district's medium sand, and described cobble-stone diameter is 5-31.5mm.
In described step 2, polypropylene fibre and concrete mass volume ratio are 1Kg:0.9m3, and expansion agent and concrete mass volume ratio are 50Kg:0.9m3.
Embodiment 2
Step 1 concrete batching
Select stone mud content to be not more than 1%, sand mud content is not more than the concrete raw material of 2%, and regulate the mass ratio of coagulation water in soil and cement to be not more than 0.38, sand mass content in cement is 45%-48%;
Step 2 ready-mixed concrete
First stone is added and sand stirs 45 seconds in mixer, add cement and water reducing agent stirs 90 seconds, slowly add water again and stir 110 seconds, then after polypropylene fibre being added to the water Homogeneous phase mixing, point two parts add mixer stirring, described polypropylene fiber filaments diameter is 9-13um, length is 12-19mm, the last calcium sulphoaluminate type cement expansive material that adds in mixer stirs, and controlling to stir total time is 260 seconds;
Step 3 concrete pouring construction
Build in floor splicing, plate-girder overlap joint, board wall lap-joint the concrete that step 2 stirs, lay alkaline-resisting grid cloth along piece, the width that alkaline-resisting grid cloth is laid is piece width twice, vibrated concrete during concreting, then uses steel roller compaction concrete;
The maintenance of step 4 concrete formation
Need after concreting, according to temperature situation, to carry out water seasoning and covering in time.
Described cement adopts 42.5Mpa level Portland cement, and described sand adopts II district's medium sand, and described cobble-stone diameter is 5-31.5mm.
In described step 2, polypropylene fibre and concrete mass volume ratio are 1Kg:0.9m3, and expansion agent and concrete mass volume ratio are 50Kg:0.9m3.
Embodiment 3
Step 1 concrete batching
Select stone mud content to be not more than 1%, sand mud content is not more than the concrete raw material of 2%, and regulate the mass ratio of coagulation water in soil and cement to be not more than 0.38, sand mass content in cement is 45%-48%;
Step 2 ready-mixed concrete
First stone is added and sand stirs 50 seconds in mixer, add cement and water reducing agent stirs 80 seconds, slowly add water again and stir 130 seconds, then after polypropylene fibre being added to the water Homogeneous phase mixing, point two parts add mixer stirring, described polypropylene fiber filaments diameter is 9-13um, length is 12-19mm, the last calcium sulphoaluminate type cement expansive material that adds in mixer stirs, and controlling to stir total time is 270 seconds;
Step 3 concrete pouring construction
Build in floor splicing, plate-girder overlap joint, board wall lap-joint the concrete that step 2 stirs, lay alkaline-resisting grid cloth along piece, the width that alkaline-resisting grid cloth is laid is piece width twice, vibrated concrete during concreting, then uses steel roller compaction concrete;
The maintenance of step 4 concrete formation
Need after concreting, according to temperature situation, to carry out water seasoning and covering in time.
Described cement adopts 42.5Mpa level Portland cement, and described sand adopts II district's medium sand, and described cobble-stone diameter is 5-31.5mm.
In described step 2, polypropylene fibre and concrete mass volume ratio are 1Kg:0.9m3, and expansion agent and concrete mass volume ratio are 50Kg:0.9m3.
The polypropylene fibre that the present invention uses is a kind of novel concrete reinforced fiber, and the feature of polypropylene fibre is that tensile strength is high, and density is 0.91g/cm 3, lower than general polymerization thing, not absorbing water completely, is neutral material, inoperative with soda acid.The three-dimensional that can form even dense distribution after polypropylene fibre being mixed concrete disorderly involves system to overlap joint, improves concrete resistance and splits ability, effectively can reduce quantity and the yardstick of concrete shrinkage and attenuating concrete surface crack and internal crack.
After Prefabricated stacking floor, in pouring concrete, mix certain volume polypropylene fibre and expansion agent, can floor strength be increased, make up the splicing of large span laminated floor slab, plate-girder overlap joint, board wall lap-joint strength deficiency, easily occur the defect in crack.The material that the present invention uses and construction method have the features such as joined technical is simple, cheap, excellent performance, have stronger applicability at temperature without area jumpy.
Claims (6)
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| CN201510041680.6A CN104712088A (en) | 2015-01-28 | 2015-01-28 | Construction method for post-poured concrete of prefabricated composite floor slabs |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107514141A (en) * | 2016-06-16 | 2017-12-26 | 中国十七冶集团有限公司 | A kind of prefabricated prefabricating technique construction technology of superimposed sheet sealing reversed beam |
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| CN2522493Y (en) * | 2002-01-28 | 2002-11-27 | 邱则有 | Board-rib combined steel reinforced concrete hollow floor |
| JP2010265689A (en) * | 2009-05-15 | 2010-11-25 | Takenaka Komuten Co Ltd | Floor formation method |
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