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 PDF

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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
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CN
China
Prior art keywords
concrete
construction
cement
sand
floor
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CN201510041680.6A
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Chinese (zh)
Inventor
赵捷
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中国十七冶集团有限公司
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Priority to CN201510041680.6A priority Critical patent/CN104712088A/en
Publication of CN104712088A publication Critical patent/CN104712088A/en

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Abstract

The invention discloses a construction method and material for post-poured concrete of prefabricated composite floor slabs. 42.5 Mpa level common portland cement is adopted, and region II medium sand is adopted for river sand; the particle size of pebbles ranges from 5 mm to 31.5 mm; polypropylene fibers accounting for, by volume, 0.1% of the concrete are divided into two parts to be added into the concrete stirring process, and a calcium sulphoaluminate type concrete expansive material accounting for, by volume, 5% of the concrete is added into the concrete stirring process. The construction method has the advantages that edge joint leakage and cracking of the prefabricated composite floor slabs are effectively avoided, the splicing strength of the prefabricated composite floor slabs is increased, and the construction quality is ensured.

Description

The construction method of pouring concrete after a kind of Prefabricated stacking floor

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)

1. the construction method of pouring concrete after Prefabricated stacking floor, is characterized in that, comprise 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.
2. the construction method of pouring concrete after a kind of Prefabricated stacking floor according to claim 1, is characterized in that, 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.
3. pouring concrete construction method after a kind of Prefabricated stacking floor according to claim 1, it is characterized in that, 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.
4. after a kind of Prefabricated stacking floor according to claim 1 or 3, the construction method of pouring concrete, is characterized in that, described polypropylene fiber filaments diameter is 9-13um, length is 12-19mm.
5. after a kind of Prefabricated stacking floor according to claim 1 or 3, the construction method of pouring concrete, is characterized in that, described expansion agent is calcium sulphoaluminate type cement expansive material.
6. the construction method of pouring concrete after a kind of Prefabricated stacking floor according to claim 1, is characterized in that, the width that in described step 3, alkaline-resisting grid cloth is laid is piece width twice.
CN201510041680.6A 2015-01-28 2015-01-28 Construction method for post-poured concrete of prefabricated composite floor slabs CN104712088A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN202787603U (en) * 2012-01-29 2013-03-13 吴淑环 Light-weight heat preservation house roof plate or floor plate

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN202787603U (en) * 2012-01-29 2013-03-13 吴淑环 Light-weight heat preservation house roof plate or floor plate

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
童仙敏等: "《建筑工程关键技术解读 土建工程》", 31 January 2014, 中国电力出版社 *
鲁统卫等: "聚丙烯纤维和膨胀剂配制抗裂防渗混凝土的研究与应用", 《2005年度山东建筑学会优秀论文集》 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN107514141B (en) * 2016-06-16 2019-06-21 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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