CN102251581A - 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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- CN102251581A CN102251581A CN2011101109135A CN201110110913A CN102251581A CN 102251581 A CN102251581 A CN 102251581A CN 2011101109135 A CN2011101109135 A CN 2011101109135A CN 201110110913 A CN201110110913 A CN 201110110913A CN 102251581 A CN102251581 A CN 102251581A
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- girder steel
- concrete slab
- armored concrete
- sealing glue
- expansion sealing
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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 waterproofing sealant 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 waterproofing sealant 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 is a kind of girder steel-reinforced concrete floor structure and job practices thereof.
Background technology
Domestic steel house construction work often adopts armored concrete slab as composite floor, and makes composite floor firmly be connected the floor system that constitutes building construction with girder steel by the weldering nail as connector.Yet concrete is a fragile material, can reach more than 20% and girder steel is better elastic material and its elongation per unit length, and when significant elongation strain takes place 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 the steel truss of encorbelmenting greatly or big cantilever steel girder, steel truss winds up, the significant elongation strain because of 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.
Though adopt the ater-casting, induce seam, increase the steel bar in reinforced concrete amount, in concrete the admixture traction-resistant fibre, optimize concrete mix or control measures such as sequence of construction, can alleviate degree and crack width that the crack occurs to a certain extent, but the distress in concrete that causes for the steel truss of encorbelmenting greatly, the distortion of big cantilever steel girder applied elongation is significant structure stress crack, takes said method still can't effectively control the generation and the development in crack.
Therefore a kind of girder steel-reinforced concrete floor structure and the job practices thereof that can control the cracks in reinforced concrete on the steel truss of encorbelmenting greatly, the big 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 girder steel-reinforced concrete floor structure and the job practices thereof that can control the cracks in reinforced concrete on the steel truss of encorbelmenting greatly, the big cantilever steel girder.
For solving the problems of the technologies described above, girder steel-armored concrete slab building cover structure that the present invention adopts, it comprises girder steel and armored concrete slab placed on it, is provided with some weldering nails of fixedlying 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 girder steel-armored concrete slab building cover structure that the present invention adopts may further comprise the steps:
S10: calculate the thickness of expansion sealing glue, this step may further comprise the steps,
S11: calculate under the loading of girder steel later stage, girder steel contacts the elongation of section with armored concrete slab, obtain the elongation rate of girder steel then
S12: according to formula
(mm) thickness t of calculating expansion sealing glue, wherein
For girder steel contacts the length of section with armored concrete slab, or be the adjacent spacing of inducing between the seam on the armored concrete slab;
S20: welding weldering nail on girder steel;
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 concreting is with sealing weldering nail and form armored concrete slab then.
One of improve: in described step S40, if the floor zone is bigger, 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 relative disengagement with 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 big 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 girder steel-reinforced concrete floor structure of plane, house overlength, also can adopt the present invention to reduce temperature effect and the concrete building plank split 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 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 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 of fixedlying 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 bigger, therefore armored concrete slab 2 is provided with and induces seam 5(referring to Fig. 3), sealing glue THICKNESS CALCULATION formula 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 performance that expands 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 take place after the infiltration and stop the continuation of seeping water deep.Simultaneously because the slow performance that expands of this material, complete expansion in a short time 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 takes place easily and failure phenomenon.Therefore need choose expansion sealing glue with preferable heat-resisting and resistance to low temperature.
The job practices of the girder steel of 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 loading of girder steel later stage, girder steel contacts the elongation of section with armored concrete slab, obtain the elongation rate of girder steel then
S12: according to formula
(mm) thickness t of calculating expansion sealing glue, wherein
For girder steel contacts the length of section with armored concrete slab, when the zone of armored concrete slab is big, can be provided with thereon and induces seam, L is adjacent spacing of inducing between the seam in this moment this formula;
S20: welding weldering nail on girder steel;
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 concreting is with sealing weldering nail and form armored concrete slab then.In this step, when needing the subregion concreting as if the floor zone is bigger, expansion sealing glue also needs the subregion parcel.
Further illustrate below in conjunction with the job practices of case history the girder steel-armored concrete slab building cover structure of present embodiment.
As shown in Figure 4, certain steel truss structure of encorbelmenting, the length of encorbelmenting 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 big, adopts job practices of the present invention can avoid the concrete floor cracking, and concrete job practices is as follows:
1. selected weldering nail diameter, 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 the type of attachment (i.e. weldering nail connected mode) of disengagement relatively with relative fully disengagement of girder steel, 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 promptly elongation rate is 0.042 ℅.If concrete floor and girder steel are combined closely, then concrete will be subjected 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 bigger,, is no more than the 18m setting by spacing and induces seam for further controlling cracks on floor slab.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 the conventional curing requirements of concrete water-proof member at last, 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 that top layer build finish and the truss construction supporting removal after, build the top layer concrete floor again.So, can discharge modified difference between most girder steel and the concrete floor.Reach in nearly 1 year inspection at this case history, do not see any visible crack or seepage situation.As seen job practices of the present invention has good effect.
Claims (5)
1. girder steel-armored concrete slab building cover structure comprises girder steel and armored concrete slab placed on it, is provided with some weldering nails of fixedlying connected with this girder steel in this armored concrete slab, and it is characterized in that: described weldering nail is wrapped with expansion sealing glue.
2. girder steel according to claim 1-armored concrete slab building cover structure is characterized in that: the thickness of described expansion sealing glue
, unit is mm, wherein
Be the elongation rate of girder steel,
Contact the length of section with armored concrete slab for girder steel.
3. girder steel according to claim 1-armored concrete slab building cover structure is characterized in that: be arranged at intervals with some seams of inducing on the described armored concrete slab, the thickness of described expansion sealing glue
, unit is mm, wherein
Be the elongation rate of girder steel,
Be adjacent spacing of inducing seam.
4. the job practices of girder steel-armored concrete slab building cover structure is characterized in that may further comprise the steps:
S10: calculate the thickness of expansion sealing glue, this step may further comprise the steps,
S11: calculate under the loading of girder steel later stage, girder steel contacts the elongation of section with armored concrete slab, obtain the elongation rate of girder steel then
S12: according to formula
, unit is mm, calculates the thickness t of expansion sealing glue, wherein
For girder steel contacts the length of section with armored concrete slab, or be the adjacent spacing of inducing between the seam on the steel concrete soil plate;
S20: welding weldering nail on girder steel;
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 concreting is with sealing weldering nail and form armored concrete slab then.
5. the job practices of girder steel according to claim 4-armored concrete slab building cover structure is characterized in that: in described step S40, if the floor zone is bigger, when needing the subregion concreting, expansion sealing glue also needs the subregion parcel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101109135A CN102251581B (en) | 2011-04-29 | 2011-04-29 | Steel beam-reinforced concrete floor structure and construction method thereof |
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|---|---|---|---|
| CN2011101109135A CN102251581B (en) | 2011-04-29 | 2011-04-29 | Steel beam-reinforced concrete floor structure and construction method thereof |
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| CN102251581B CN102251581B (en) | 2013-09-18 |
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Cited By (3)
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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 |
| CN104032771A (en) * | 2014-06-20 | 2014-09-10 | 中建五局第三建设有限公司 | Anti-cracking construction method for additionally arranging induction joint on 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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| JP2011074754A (en) * | 2010-11-26 | 2011-04-14 | Ps Mitsubishi Construction Co Ltd | Method for manufacturing floor slab of steel-concrete composite using precast concrete panel |
| 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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| 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 |
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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 |
| CN104032771A (en) * | 2014-06-20 | 2014-09-10 | 中建五局第三建设有限公司 | Anti-cracking construction method for additionally arranging induction joint on 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 |
| CN109930466B (en) * | 2019-04-10 | 2024-06-04 | 西南交通大学 | Steel-ECC-concrete composite beam and preparation method thereof |
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| CN102251581B (en) | 2013-09-18 |
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