CN202031216U - Steel beam-steel bar concrete building roof structure - Google Patents
Steel beam-steel bar concrete building roof structure Download PDFInfo
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- CN202031216U CN202031216U CN2011201337851U CN201120133785U CN202031216U CN 202031216 U CN202031216 U CN 202031216U CN 2011201337851 U CN2011201337851 U CN 2011201337851U CN 201120133785 U CN201120133785 U CN 201120133785U CN 202031216 U CN202031216 U CN 202031216U
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- girder steel
- steel
- concrete slab
- armored concrete
- bar concrete
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Abstract
The utility model relates to the building field, in particular to a steel beam-steel bar concrete building roof structure and a construction method thereof. The building roof structure comprises steel beams and steel bar concrete slabs arranged on the steel beams; a plurality of welding studs fixedly connected with the steel beams are arranged in the steel bar concrete slabs, wherein swelling water-stop glue is wrapped outside the welding studs. The utility model provides a relatively disjointed connecting manner of steel bar concrete slabs and steel beams; the swelling water-stop glue is wrapped outside the welding studs, so that the phenomenon that the steel bar concrete slabs crack caused by obvious deformation and extension of the steel beams is prevented.
Description
Technical field
The utility model relates to building field, specifically is a kind of girder steel-reinforced concrete floor structure.
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 1 is the crack on the armored concrete slab, and 2 is the girder steel top flange, and 3 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 that can control the cracks in reinforced concrete on the steel truss of encorbelmenting greatly, the big cantilever steel girder is provided is technical issues that need to address.
The utility model content
The technical problem that the utility model solves provides a kind of girder steel-reinforced concrete floor structure 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 utility model adopts, this building cover structure comprises girder steel and armored concrete slab placed on it, be provided with some weldering nails of fixedlying connected with this girder steel in this armored concrete slab, 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.
Compared with prior art, beneficial effect is: the utility model provides the connected mode of 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 utility model to make reinforced concrete floor not follow girder steel generation deform in same pace and control the crack; For the girder steel-reinforced concrete floor structure of plane, house overlength, also can adopt the utility model 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 embodiment girder steel-armored concrete slab building cover structure;
Fig. 3 is the structural representation that embodiment welds nail;
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, can avoid in work progress, running into construction water, complete expansion in a short time and lose the needed late expansion rate of engineering when meeting water.(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.Owing to the high temperature trickling property of the most waterproofing materialss that possess water-swellable is lower, take place because of trickling distortion or low-temperature embrittleness failure phenomenon easily.Therefore need choose expansion sealing glue with preferable heat-resisting and resistance to low temperature.
Can making of the girder steel of present embodiment-armored concrete slab building cover structure by following job practices, this method 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 calculates the thickness t of 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 utility model 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 the utlity model has good control crack effect.
Claims (3)
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201337851U CN202031216U (en) | 2011-04-29 | 2011-04-29 | Steel beam-steel bar concrete building roof structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201337851U CN202031216U (en) | 2011-04-29 | 2011-04-29 | Steel beam-steel bar concrete building roof structure |
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| Publication Number | Publication Date |
|---|---|
| CN202031216U true CN202031216U (en) | 2011-11-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201337851U Expired - Lifetime CN202031216U (en) | 2011-04-29 | 2011-04-29 | Steel beam-steel bar concrete building roof structure |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102251581A (en) * | 2011-04-29 | 2011-11-23 | 深圳市建筑设计研究总院有限公司 | Steel beam-reinforced concrete floor structure and construction method thereof |
-
2011
- 2011-04-29 CN CN2011201337851U patent/CN202031216U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102251581A (en) * | 2011-04-29 | 2011-11-23 | 深圳市建筑设计研究总院有限公司 | Steel beam-reinforced concrete floor structure and construction method thereof |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20111109 |
|
| CX01 | Expiry of patent term |