CN101694127B - Formwork support system for steel frame structure cast-in-place concrete floorslabs - Google Patents

Abstract

The invention discloses a formwork support system for steel frame structure cast-in-place concrete floorslabs. The formwork support system comprises I-shaped section beams, horizontal scaffold steel pipes, vertical scaffold steel pipes, steel pipe fasteners, timber formworks, tie bar steel pipes and battens; two horizontal scaffold steel pipes and a plurality of vertical scaffold steel pipes are connected by the steel pipe fasteners to form scaffold steel pipe trusses; more than two scaffold steel pipe trusses are connected with more than two tie bar steel pipes by the steel pipe fasteners; the lower ends of the scaffold steel pipe trusses are arranged on the lower flanges of the I-shaped section beams, the battens are arranged on the upper ends of the scaffold steel pipe trusses, and the timber formworks are arranged on the battens. Compared with the background art, the invention has the advantages: 1) the timber formworks are used for freely fabrication and assembly; 2) steel pipe top bracings are avoided, thereby reducing the site work load; and 3) the formworks are supported on the lower flanges of the beams, thereby providing wide working platforms for the operations of all types of work, and realizing multilayer stereo operation to further accelerate the construction progress.

Description

The formwork bracing system of steel framed structure cast-in-place concrete floor

Technical field

The present invention relates to building field, relate in particular to a kind of formwork bracing system of steel framed structure cast-in-place concrete floor.

Background technology

Multi-rise building adopts steel work, has from heavy and light, advantage such as anti-seismic performance is good, speed of application is fast, environment pollution is little, and China's multi-rise building adopts steel work more and more general.What steel framed structure application at present was more is common cast-in-place concrete floor and profiled sheet-cast-in-situ concrete composite floor.

But also there is following problem in it:

1) common cast-in-place concrete floor need be installed a large amount of the templates supports in flooring, and construction speed is slow.

2) profiled sheet need be provided with the end anchor firmware, has increased the complexity of construction.

3) if will consider the compound action of profiled sheet and concrete floor, removing needs to adopt special shape or special tectonic, to the durability of steel plate with prevent fires requirement is also arranged; Otherwise the template of steel plate during just as floor slab construction is promptly ineffective after construction is finished, and needs to consume great deal of steel.

4) profiled sheet can not bear separately and not tie hard concrete load and working load, need establish and vertically support between striding temporarily, comprises sub-truss and shores in the steel pipe of flooring, has slowed down construction speed, increases Master Cost.

Summary of the invention

The objective of the invention is to overcome the prior art deficiency, a kind of formwork bracing system of steel framed structure cast-in-place concrete floor is provided.

The formwork bracing system that is used for the steel framed structure cast-in-place concrete floor comprises i shaped cross section beam, horizontal scaffold member steel pipe, vertical scaffolding steel pipe, steel tube fastener, wooden form, tie-rod steel pipe, stupefied wood; 2 horizontal scaffold member steel pipes and the vertical scaffolding steel pipe of Duo Gen are connected to form the scaffolding steel pipe truss by steel tube fastener, the above scaffolding steel pipe truss of 2 Pin is connected by steel tube fastener with 2 above tie-rod steel pipes, scaffolding steel pipe truss lower end places the bottom flange of i shaped cross section beam, the stupefied wood of scaffolding steel pipe truss upper ends is placed wooden form on the stupefied wood.

Described two adjacent i shaped cross section case bays are during less than 3 meters, and adjacent two Pin scaffolding steel pipe truss spaces are not more than 2.5 meters; When two adjacent i shaped cross section case bays were 3 meters to 4 meters, adjacent two Pin scaffolding steel pipe truss spaces were not more than 1.5 meters; When two adjacent i shaped cross section case bays were 4 meters to 5 meters, adjacent two Pin scaffolding steel pipe truss spaces were not more than 0.9 meter.The aspect ratio i shaped cross section depth of beam of described scaffolding steel pipe truss is little 10 centimetres to 12 centimetres.Place the spacing of stupefied wood on the described horizontal scaffold member steel pipe at 20 centimetres to 30 centimetres.The upper surface of described wooden form flushes with the soffit of i shaped cross section beam top flange.

The present invention compares the beneficial effect that has with background technology:

1) adopt wooden form, it is random to make assembly unit.

2) save steel pipe and shored, reduced the site work amount.

3) template is supported on the bottom flange of beam among the present invention, for various work post operations provide spacious working platform, can the layer stereo operation, and accelerating construction progress.

Description of drawings

Fig. 1 is the sectional drawing of support arrangement;

Fig. 2 is the plan view of support arrangement;

Among the figure: i shaped cross section beam 1, horizontal scaffold member steel pipe 2, vertical scaffolding steel pipe 3, steel tube fastener 4, wooden form 5, tie-rod steel pipe 6, scaffolding steel pipe truss 7, stupefied wooden 8.

The specific embodiment

The formwork bracing system that is used for the steel framed structure cast-in-place concrete floor comprises i shaped cross section beam 1, horizontal scaffold member steel pipe 2, vertical scaffolding steel pipe 3, steel tube fastener 4, wooden form 5, tie-rod steel pipe 6, stupefied wooden 8; 2 horizontal scaffold member steel pipes 2 and the vertical scaffolding steel pipe 3 of Duo Gen are connected to form scaffolding steel pipe truss 7 by steel tube fastener 4, the above scaffolding steel pipe truss 7 of 2 Pin is connected by steel tube fastener 4 with 2 above tie-rod steel pipes 6, scaffolding steel pipe truss 7 lower ends place the bottom flange of i shaped cross section beam 1, place wooden form 5 on scaffolding steel pipe truss 7 upper ends stupefied wooden 8, stupefied wooden 8.

Described two adjacent i shaped cross section beam 1 spacings are during less than 3 meters, and adjacent two Pin scaffolding steel pipe truss, 7 spacings are not more than 2.5 meters; When two adjacent i shaped cross section beam 1 spacings were 3 meters to 4 meters, adjacent two Pin scaffolding steel pipe truss, 7 spacings were not more than 1.5 meters; When two adjacent i shaped cross section beam 1 spacings were 4 meters to 5 meters, adjacent two Pin scaffolding steel pipe truss, 7 spacings were not more than 0.9 meter.The aspect ratio i shaped cross section beam 1 of described scaffolding steel pipe truss 7 is highly little 10 centimetres to 12 centimetres.Place stupefied wooden 8 spacing on the described horizontal scaffold member steel pipe 2 at 20 centimetres to 30 centimetres.The upper surface of described wooden form 5 flushes with the soffit of i shaped cross section beam 1 top flange.

Embodiment.Be provided with a steel framed structure, i shaped cross section case bay 3m, scaffolding steel pipe rise of a truss 0.4m, spacing 2.5m.Wooden form thickness 18mm, stupefied wood adopts 50mm * 100mm, stupefied wooden spacing 300mm, modulus of elasticity of wood 10000N/mm ², flexural strength 13N/mm ²The scaffolding steel pipe truss adopts

The Q235 steel, modulus of elasticity 2.06 * 10 ⁵N/mm ², intensity 215N/mm ²The dead load standard value is: template deadweight 0.3kN/m ², the thick ordinary concrete plate of 150mm 3.6kN/m ²The mobile load standard value is: constructor and equipment 2.5kN/m ²During the supporting capacity checking computations, the design load on the template is 1.2 * 3.9+1.4 * 2.5=8.18kN/m ², template is the one-way slabs of span 2.5m, gets the wide strip of 0.3m, its maximum stress in bend is Being subjected to line load on the scaffolding steel pipe truss is 8.18 * 2.5=20.45kN/m, and span 3m bears moment of flexure by the horizontal scaffold member steel pipe, maximum stress ${\mathrm{\&sigma;}}_2=\frac{1/{8\mathrm{ql}}^2}{W}=\frac{20.45\&times;{3000}^2}{8\&times;2.327\&times;{10}^7/200}=197.7N/{\mathrm{<figure-callout\; id="2"\; label="mm"\; filenames="H2009101540434E00011.png"\; state="\{\{state\}\}">mm</figure-callout>}}^2<[215N/{\mathrm{mm}}^2],$ Vertical scaffolding steel pipe bears shearing, maximum stress ${\mathrm{\&sigma;}}_3=\frac{1/2\mathrm{ql}}{A}=\frac{20.45\&times;3000}{2\&times;289}=106.1N/{\mathrm{<figure-callout\; id="2"\; label="mm"\; filenames="H2009101540434E00011.png"\; state="\{\{state\}\}">mm</figure-callout>}}^2<[215N/{\mathrm{mm}}^2].$ During deformation analysis, disregard shear strain, the load of template is 0.3+3.6=3.9kN/m ², the template maximum defluxion is ${\mathrm{\&delta;}}_1=\frac{{5\mathrm{<figure-callout\; id="4"\; label="ql"\; filenames="H2009101540434E00011.png,H2009101540434E00012.png"\; state="\{\{state\}\}">ql</figure-callout>}}^4}{384\mathrm{EI}}=\frac{5\&times;3.9\&times;{10}^{-3}\&times;300\&times;{2500}^4}{384\&times;10000\&times;1.33\&times;{10}^7}=4.5\mathrm{mm}<l/250=8\mathrm{mm};$ Being subjected to line load on the scaffolding steel pipe truss is 3.9 * 2.5=9.75kN/m, scaffolding steel pipe truss maximum defluxion ${\mathrm{\&delta;}}_2=\frac{{5\mathrm{<figure-callout\; id="4"\; label="ql"\; filenames="H2009101540434E00011.png,H2009101540434E00012.png"\; state="\{\{state\}\}">ql</figure-callout>}}^4}{384\mathrm{EI}}=\frac{5\&times;9.75\&times;{3000}^4}{384\&times;2.06\&times;{10}^5\&times;2.327\&times;{10}^7}=2.1mm<l/250=12\mathrm{mm},$ All meet the demands.

Claims (4)

1. formwork bracing system that is used for the steel framed structure cast-in-place concrete floor is characterized in that: it comprises i shaped cross section beam (1), horizontal scaffold member steel pipe (2), vertical scaffolding steel pipe (3), steel tube fastener (4), wooden form (5), tie-rod steel pipe (6), stupefied wood (8); 2 horizontal scaffold member steel pipes (2) and many vertical scaffolding steel pipes (3) are connected to form scaffolding steel pipe truss (7) by steel tube fastener (4), the above scaffolding steel pipe truss of 2 Pin (7) are connected by steel tube fastener (4) with 2 above tie-rod steel pipes (6), scaffolding steel pipe truss (7) lower end places the bottom flange of i shaped cross section beam (1), the stupefied wood of scaffolding steel pipe truss (7) upper ends (8), stupefied wood (8) are gone up and are placed wooden form (5); Described two adjacent i shaped cross section beam (1) spacings are during less than 3 meters, and adjacent two Pin scaffolding steel pipe truss (7) spacings are not more than 2.5 meters; When two adjacent i shaped cross section beam (1) spacings were 3 meters to 4 meters, adjacent two Pin scaffolding steel pipe truss (7) spacings were not more than 1.5 meters; When two adjacent i shaped cross section beam (1) spacings were 4 meters to 5 meters, adjacent two Pin scaffolding steel pipe truss (7) spacings were not more than 0.9 meter.

2. a kind of formwork bracing system that is used for the steel framed structure cast-in-place concrete floor according to claim 1 is characterized in that the aspect ratio i shaped cross section beam (1) of described scaffolding steel pipe truss (7) is highly little 10 centimetres to 12 centimetres.

3. a kind of formwork bracing system that is used for the steel framed structure cast-in-place concrete floor according to claim 1 is characterized in that the last spacing of stupefied wood (8) of placing of described horizontal scaffold member steel pipe (2) is at 20 centimetres to 30 centimetres.

4. a kind of formwork bracing system that is used for the steel framed structure cast-in-place concrete floor according to claim 1 is characterized in that the upper surface of described wooden form (5) flushes with the soffit of i shaped cross section beam (1) top flange.

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