CN102251581B - Steel beam-reinforced concrete floor structure and construction method thereof - Google Patents
Steel beam-reinforced concrete floor structure and construction method thereof Download PDFInfo
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- CN102251581B CN102251581B CN2011101109135A CN201110110913A CN102251581B CN 102251581 B CN102251581 B CN 102251581B CN 2011101109135 A CN2011101109135 A CN 2011101109135A CN 201110110913 A CN201110110913 A CN 201110110913A CN 102251581 B CN102251581 B CN 102251581B
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- girder steel
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Abstract
The invention relates to the field of buildings, in particular to a steel beam-reinforced concrete floor structure and a construction method thereof. The floor structure comprises a steel beam and a reinforced concrete slab arranged on the steel beam, wherein a plurality of welding studs fixedly connected with the steel beam are arranged in the reinforced concrete slab and expansion waterproofingsealant is wrapped outside the welding studs. The invention provides a connecting way for relatively disengaging the reinforced concrete floor slab from the steel beam, as the expansion waterproofingsealant is wrapped outside the welding studs, the cracking phenomenon of the reinforced concrete floor slab due to significant deformation and elongation of the steel beam can be avoided. In addition, the invention further provides the construction method of the floor structure.
Description
Technical field
The present invention relates to building field, specifically a kind of steel beam-steel bar concrete building roof structure and job practices thereof.
Background technology
Domestic structure of steel structure building engineering often adopts armored concrete slab as composite floor, and makes composite floor firmly be connected the floor system that consists of building construction with girder steel by the weldering nail as connector.Yet concrete is fragile material, can reach more than 20% and girder steel is good elastomeric material and its elongation per unit length, and when significant elongation strain occurs girder steel, the concrete of combining closely with it can't adapt to the deflection of girder steel and ftracture.Especially in the time of on armored concrete slab is bearing in winding up of large Steel Cantilever Truss or large cantilever steel girder, steel truss winds up, the significant elongation strain because tension produces of girder steel top flange, and crack (referring to Fig. 1) will inevitably appear in concrete floor.In Fig. 1, F is that girder steel is subjected to force direction, and 10 is the crack on the armored concrete slab, and 20 is the girder steel top flange, and 30 are the weldering nail.
Although adopt the ater-casting, induce seam, increase reinforcing bar amount, the measures such as admixture traction-resistant fibre, optimization concrete mix or control sequence of construction in concrete in the steel concrete, can alleviate to a certain extent degree and crack width that the crack occurs, but the distress in concrete that causes for large Steel Cantilever Truss, the distortion of large cantilever steel girder applied elongation is significant structure stress crack, takes said method still can't effectively control generation and the development in crack.
Therefore a kind of steel beam-steel bar concrete building roof structure and the job practices thereof that can control the cracks in reinforced concrete on large Steel Cantilever Truss, the large cantilever steel girder be provided is technical issues that need to address.
Summary of the invention
The technical problem that the present invention solves provides a kind of steel beam-steel bar concrete building roof structure and the job practices thereof that can control the cracks in reinforced concrete on large Steel Cantilever Truss, the large cantilever steel girder.
For solving the problems of the technologies described above, the girder steel that the present invention adopts-armored concrete slab building cover structure, it comprises girder steel and armored concrete slab placed on it, is provided with some weldering nails that are fixedly connected with this girder steel in this armored concrete slab, and wherein: described weldering nail is wrapped with expansion sealing glue.
One of improve: the thickness of described expansion sealing glue
(mm), wherein
Be the elongation rate of girder steel,
Contact the length of section with armored concrete slab for girder steel.
Two of improvement: be arranged at intervals with some seams of inducing on the described armored concrete slab, the thickness of described expansion sealing glue
(mm), wherein
Be the elongation rate of girder steel,
Be adjacent spacing of inducing seam.
For solving the problems of the technologies described above, the job practices of the girder steel that the present invention adopts-armored concrete slab building cover structure may further comprise the steps:
S10: calculate the thickness of expansion sealing glue, this step may further comprise the steps,
S11: calculate under the girder steel later stage load, girder steel contacts the elongation of section with armored concrete slab, then obtain the elongation rate of girder steel
S12: according to formula
(mm) thickness t of calculating expansion sealing glue, wherein
Contact the length of section for girder steel with armored concrete slab, or be the adjacent spacing of inducing between the seam on the armored concrete slab;
S20: at girder steel welding weldering nail;
S30: colligation floor bar;
S40: the thickness t of the expansion sealing glue that calculates according to step S10 is wrapped up each weldering nail, and then concreting is with sealing weldering nail and form armored concrete slab.
One of improve: in described step S40, if the floor zone is larger, when needing the subregion concreting, expansion sealing glue also needs the subregion parcel.
Compared with prior art, beneficial effect is: the connected mode that the invention provides the disengagement relative to girder steel of a kind of reinforced concrete floor, because weldering nail is wrapped with expansion sealing glue, can avoid the remarkable anamorphic stretching of invar beam and the phenomenon of the reinforced concrete floor cracking that causes.In addition, for the steel work conjoined structure of highrise building, if it when horizontal distortion is larger under geological process, also can adopt the present invention to make reinforced concrete floor not follow girder steel generation deform in same pace and control distress in concrete; For the steel beam-steel bar concrete building roof structure of plane, house overlength, also can adopt the present invention to reduce temperature effect and the Cracks On Concrete Floors that causes.
Description of drawings
Fig. 1 is the crack schematic diagram of existing girder steel-armored concrete slab building cover structure;
Fig. 2 is the structural representation of the girder steel-armored concrete slab building cover structure of embodiment;
Fig. 3 is the weldering pin structure schematic diagram of embodiment;
Fig. 4 is the structural representation of the described case history of embodiment.
The specific embodiment
As shown in Figure 2, the girder steel of the present embodiment-armored concrete slab building cover structure comprises that girder steel 1 and armored concrete slab 2(placed on it are also referred to as reinforced concrete floor).As shown in Figure 3, be provided with some weldering nails 3 that are fixedly connected with this girder steel 1 in this armored concrete slab 2, weldering nail 3 is wrapped with expansion sealing glue 4.Weldering nail 3 outer wrapping expansion sealing glue can absorb due to the distortion of weldering nail 3(girder steel on the one hand) displacement avoid concrete slab the crack to occur, even weldering nail 3 place's concrete the crack occurs and also can stop this crack, place to be seeped water on the other hand.
The thickness of the expansion sealing glue of these weldering nail 3 parcels
(mm), wherein
Be the elongation rate of girder steel 1,
Contact the length of section with armored concrete slab 2 for girder steel 1.In the present embodiment, because armored concrete slab 2 zones are larger, therefore are provided with at armored concrete slab 2 and induce seam 5(referring to Fig. 3), sealing glue thickness equations expands this moment
(mm)
Then be adjacent spacing of inducing seam.
When selecting expansion sealing glue, need to consider following performance: (1) meets the slow swollen performance of water.7 days clean expansion rate should be greater than 60% of final expansion rate, and the final volume expansion rate should be not less than 250%; When this material since the error of constructing operation fail and weld nail, when concrete is combined closely, run into and volume expansion will occur after the infiltration and stop the continuation of seeping water deep.Simultaneously because the slow swollen performance of this material, in a short time complete expansion in the time of can avoiding in work progress, running into construction water, rainwater and lose the needed late expansion rate of engineering.(2) heat-resisting and resistance to low temperature.Because the temperature of job site may be higher or lower, particularly steel component surface temperature may reach more than 60 ℃ when the sun is exposed to the sun.Usually, the high temperature trickling property of common waterproofing materials that possesses the water-swellable performance is lower, high temperature trickling distortion or low-temperature embrittleness easily occurs and the phenomenon that lost efficacy.Therefore need to choose the expansion sealing glue with better heat-resisting and resistance to low temperature.
The job practices of the girder steel of the present embodiment-armored concrete slab building cover structure may further comprise the steps:
S10: calculate the thickness of expansion sealing glue, this step comprises following two steps,
S11: calculate under the girder steel later stage load, girder steel contacts the elongation of section with armored concrete slab, then obtain the elongation rate of girder steel
S12: according to formula
(mm) thickness t of calculating expansion sealing glue, wherein
Contact the length of section for girder steel with armored concrete slab, when the zone of armored concrete slab is larger, can arranges thereon and induce seam, L is adjacent spacing of inducing between the seam in this formula at this moment;
S20: at girder steel welding weldering nail;
S30: colligation floor bar;
S40: the thickness t of the expansion sealing glue that calculates according to step S10 is wrapped up each weldering nail, and then concreting is with sealing weldering nail and form armored concrete slab.In this step, if the floor zone is larger when needing the subregion concreting, expansion sealing glue also needs the subregion parcel.
Below in conjunction with case history the job practices of the girder steel of the present embodiment-armored concrete slab building cover structure is carried out further description.
As shown in Figure 4, certain Steel Cantilever Truss structure, cantilever span 36m comprises that each floor plate of roofing adopts profiled sheet-steel concrete, with the chord member 6(girder steel of truss) be connected with the weldering nail.Under vertical uniform load q, the elongation strain amount of pricncipal rafter is very large, adopts job practices of the present invention can avoid the concrete floor cracking, and concrete construction method is as follows:
1. diameter is followed closely in selected weldering, because this cantilevered structure height reaches 25m, under local 12 grades of typhoon effects, structure is out of shape occurred level, floor should not be taked with fully relative disengagement of girder steel the type of attachment (i.e. weldering nail connected mode) of relatively disengagement, determines that it is 16mm that diameter is followed closely in weldering.
2. choose expansion sealing glue by following standard: clean expansion rate was not more than 60% of final expansion rate in 7 days, and the final volume expansion rate is not less than 300%, and high temperature resistant 150 ℃ do not trickle, low temperature resistant-20 ℃ of embrittlements not.
3. calculate truss under later stage load (weight such as concrete floor deadweight, top layer water-proof heat-insulation material weight, earthing weight, live load weight, curtain wall weight and interior decoration) effect, pricncipal rafter (being girder steel) is in the elongation strain amount of interior span.This example reaches 7.6mm, and namely elongation rate is 0.042 ℅.If concrete floor and girder steel are combined closely, then concrete will be subject to the additional potential stress of 13.3MPa, and considerably beyond concrete in tension strength standard value 2.20MPa limit value, concrete floor will ftracture.
4. because the floor zone is larger, for further controlling cracks on floor slab, is no more than the 18m setting by spacing and induces seam.According to formula
Mm, the theoretic throat that calculates expansion sealing glue is 3.8mm, actual (real) thickness adopts 5mm.
5. colligation floor bar.
6. subregion superscribes the thick expansion sealing glue of 5mm with the nail of the weldering on the chord member, checks the after-pouring concrete.I.e. " subregion parcel, subregion is built ", the sealing glue of avoiding expanding exposes overlong time and reduces properties of product.
7. press at last the conventional curing requirements of concrete water-proof member, concrete is carried out necessary maintenance.
In addition, in above-mentioned construction sequence, also need to take suitable sequence of construction, make the modified difference between girder steel and the concrete floor as far as possible little.For example each the layer concrete floor except top layer build complete and the truss construction supporting removal after, build again the top layer concrete floor.So, can discharge modified difference between most girder steel and the concrete floor.Reach in nearly 1 year inspection at this case history, have no any visible crack or seepage situation.As seen job practices of the present invention has good effect.
Claims (3)
1. a steel beam-steel bar concrete building roof structure comprises girder steel and reinforcing bar placed on it
Concrete slab is provided with some weldering nails that are fixedly connected with this girder steel in this armored concrete slab, its
Be characterised in that: described weldering nail is wrapped with expansion sealing glue, described expansion sealing glue 7 days clean
Expansion rate is not more than 60% of final expansion rate, and the final volume expansion rate is not less than 300%, and is anti-
150 ℃ of high temperature do not trickle, low temperature resistant-20 ℃ of embrittlements not; The thickness of described expansion sealing glue is
T=
1.0+ε * L/2, unit is mm, wherein
ε isThe elongation rate of girder steel,
LBe girder steel and reinforcing bar
The length of concrete slab contact section, or on armored concrete slab, be provided with some seams of inducing
The time, be adjacent spacing of inducing seam.
2. the job practices of a steel beam-steel bar concrete building roof structure is characterized in that comprising
Following steps:
S10: calculate the thickness of expansion sealing glue, this step may further comprise the steps,
S11: calculate under the girder steel later stage load, girder steel contacts section with armored concrete slab
Elongation, then obtain the elongation rate of girder steel
ε
S12: according to formula
T=1.0+ε * L/2, unit is mm, calculates expansion sealing glue
Thickness t, wherein
LContact the length of section for girder steel with armored concrete slab, or be reinforcing bar
Adjacent spacing of inducing between the seam on the concrete slab;
S20: at girder steel welding weldering nail;
S30: colligation floor bar;
S40: the thickness of the expansion sealing glue that calculates according to step S10
tWrap up each weldering
Nail, then concreting is with sealing weldering nail and formation armored concrete slab;
7 days clean expansion rate of described expansion sealing glue is not more than 60% of final expansion rate, and is final
Cubical expansivity is not less than 300%, and high temperature resistant 150 ℃ do not trickle, low temperature resistant-20 ℃ of embrittlements not.
3. the job practices of described steel beam-steel bar concrete building roof structure according to claim 2,
It is characterized in that: in described step S40, if the floor zone is larger, need subregion to build mixed
During solidifying soil, expansion sealing glue also needs the subregion parcel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101109135A CN102251581B (en) | 2011-04-29 | 2011-04-29 | Steel beam-reinforced concrete floor structure and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101109135A CN102251581B (en) | 2011-04-29 | 2011-04-29 | Steel beam-reinforced concrete floor structure and construction method thereof |
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| Publication Number | Publication Date |
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| CN102251581A CN102251581A (en) | 2011-11-23 |
| CN102251581B true CN102251581B (en) | 2013-09-18 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103216035A (en) * | 2013-04-15 | 2013-07-24 | 北京交通大学 | Ductility structure of reinforced concrete frame beam and construction method thereof |
| CN104032771B (en) * | 2014-06-20 | 2016-02-03 | 中建五局第三建设有限公司 | Attractive joint anti-crack construction method set up by a kind of underground structure |
| CN109930466A (en) * | 2019-04-10 | 2019-06-25 | 西南交通大学 | Steel-ECC- concrete combination beam and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2661809Y (en) * | 2003-11-11 | 2004-12-08 | 李勇 | nternal force adjustable prestressed steel-concrete combination beam |
| JP2007138555A (en) * | 2005-11-18 | 2007-06-07 | Kawasaki Heavy Ind Ltd | Composite floor slab for elevated road |
| JP5298690B2 (en) * | 2008-07-31 | 2013-09-25 | 宇部興産機械株式会社 | Synthetic floor slab |
| CN201411822Y (en) * | 2009-05-27 | 2010-02-24 | 北京京诚华宇建筑设计研究院有限公司 | Novel pre-tensioned steel-concrete composite beam |
| JP5051598B2 (en) * | 2010-11-26 | 2012-10-17 | 株式会社ピーエス三菱 | Construction method of steel / concrete composite deck using precast concrete board |
| CN202031216U (en) * | 2011-04-29 | 2011-11-09 | 深圳市建筑设计研究总院有限公司 | Steel beam-steel bar concrete building roof structure |
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