CN101701493B - Template support system of box type girder cast-in-place concrete floor plate of steel frame construction - Google Patents

Abstract

The invention discloses a formwork support system for a steel frame structure box girder cast-in-place concrete floor slab. It includes box-section beams, corbels, horizontal scaffold steel pipes, vertical scaffold steel pipes, steel pipe fasteners, wood formwork, tie rod steel pipes, corrugated wood; 2 horizontal scaffold steel pipes are connected with multiple vertical scaffold steel pipes through steel pipe fasteners Scaffold steel pipe trusses are composed, more than 2 scaffold steel pipe trusses and more than 2 tie rod steel pipes are connected by steel pipe fasteners, the corbels are welded to the box section beams, the lower end of the scaffold steel pipe trusses is placed on the corbels, and the upper end of the scaffold steel pipe trusses is placed with corrugated wood. The wooden formwork is placed on the corrugated wood. The corbel is made of 100×10 angle steel with a length of 200 mm. The length of the welds between the back and tip of the corbel and the box-section beam is not less than 100 mm, and the height of the weld is 6 mm. The present invention adopts wooden formwork, which can be fabricated and assembled at will, saves the support of steel pipes, and reduces on-site workload. The formwork support can be multi-layered and three-dimensional to speed up the construction progress.

Description

Formwork support system for cast-in-place concrete floor slabs with steel frame structure box girders

technical field

The invention relates to the construction field, in particular to a formwork support system for a steel frame structure box girder cast-in-place concrete floor slab.

Background technique

Multi-high-rise buildings adopt steel structures, which have the advantages of light weight, good seismic performance, fast construction speed, and low environmental pollution. The use of steel structures in multi-high-rise buildings in my country is becoming more and more common. At present, ordinary cast-in-place concrete slabs and profiled steel-cast-in-place concrete composite slabs are widely used in steel frame structures.

But it also has the following problems:

1) Ordinary cast-in-place concrete floor slabs need to install a large number of formwork supports on the floor, and the construction progress is slow.

2) The profiled steel plate needs to be equipped with end anchors, which increases the complexity of construction.

3) If it is necessary to consider the combined effect of profiled steel plate and concrete floor slab, in addition to adopting a special form or special structure, there are also requirements for the durability and fire protection of the steel plate; otherwise, the steel plate is only used as a formwork during the construction of the floor slab, and it will lose its effect after the construction is completed. , need to consume a lot of steel.

4) The profiled steel plate cannot bear the unhardened concrete load and construction load alone, and it is necessary to set up temporary vertical supports between spans, including support trusses and steel pipe top supports supported on the floor, which slows down the construction progress and increases material costs.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art and provide a formwork support system for a steel frame structure box girder cast-in-place concrete floor slab.

Formwork support system for steel frame structure box girder cast-in-place concrete slabs includes box section beams, corbels, horizontal scaffold steel pipes, vertical scaffold steel pipes, steel pipe fasteners, wooden formwork, tie rod steel pipes, corrugated wood; 2 horizontal scaffolds Steel pipes and multiple vertical scaffold steel pipes are connected by steel pipe fasteners to form a scaffold steel pipe truss. More than 2 scaffold steel pipe trusses and more than 2 tie rod steel pipes are connected by steel pipe fasteners. Corbels are welded to box-section beams, and the lower end of scaffold steel pipe trusses Placed on the corbel, the upper end of the steel pipe truss of the scaffold is placed with corrugated wood, and the wooden formwork is placed on the corrugated wood. The corbel is made of 100×10 angle steel with a length of 200mm. Not less than 100 mm, the height of the weld is 6 mm, and the tip of the limb is 20 mm from the bottom of the box-section beam.

When the distance between two adjacent box-section beams is less than 3 meters, the distance between two adjacent scaffold steel pipe trusses is not more than 2.5 meters; when the distance between two adjacent box-section beams is 3 meters to 5 meters, the distance between two adjacent scaffolds The distance between steel pipe trusses is not greater than 0.9 meters; when the distance between two adjacent box-section beams is 5 meters to 7 meters, the distance between two adjacent scaffolding steel pipe trusses is not greater than 0.5 meters. The height of the steel pipe truss of the scaffold is 10 cm to 12 cm smaller than the height of the box section beam. The spacing between the horizontal scaffolding steel pipes where the corrugated wood is placed is 20 centimeters to 30 centimeters. The upper surface of the wooden formwork is flush with the top surface of the box-section beam.

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

1) Using wooden formwork, making and assembling at will.

2) Save the steel pipe top support, reduce the workload on site.

3) In the present invention, the formwork is supported on the lower flange of the beam, which provides a spacious working platform for various types of work, can work in multi-layer three-dimensional, and speeds up the construction progress.

Description of drawings

Figure 1 is a cross-sectional view of the support arrangement;

Figure 2 is a plan view of the support arrangement;

In the figure: box section beam 1, corbel 2, horizontal scaffolding steel pipe 3, vertical scaffolding steel pipe 4, steel pipe fastener 5, wooden formwork 6, tie rod steel pipe 7, corrugated wood 9.

Detailed ways

The formwork support system of the steel frame structure box girder cast-in-place concrete floor includes box section beam 1, corbel 2, horizontal scaffold steel pipe 3, vertical scaffold steel pipe 4, steel pipe fastener 5, wooden formwork 6, tie rod steel pipe 7, Lumber 9; 2 horizontal scaffold steel pipes 3 and multiple vertical scaffold steel pipes 4 are connected through steel pipe fasteners 5 to form a scaffold steel pipe truss 8, more than 2 scaffold steel pipe trusses 8 and more than 2 tie rod steel pipes 7 pass through steel pipe fasteners 5 Connection, the corbel 2 is welded to the box-section beam 1, the lower end of the scaffold steel pipe truss 8 is placed on the corbel 2, the upper end of the scaffold steel pipe truss 8 is placed on the corrugated wood 9, and the wooden formwork 6 is placed on the corrugated wood 9, and the corbel 2 is 100×10 Angle steel with a length of 200 mm, the length of the welds between the back and shoulder of the corbel 2 and the box-section beam 1 is not less than 100 mm, the height of the weld is 6 mm, and the tip of the leg is 20 mm from the bottom of the box-section beam.

When the distance between two adjacent box-section beams 1 is less than 3 meters, the distance between two adjacent scaffolding steel pipe trusses 8 is not more than 2.5 meters; when the distance between two adjacent box-section beams 1 is 3 meters to 5 meters, the distance between adjacent The distance between two scaffolding steel pipe trusses 8 is not more than 0.9 meters; when the distance between two adjacent box-section beams is 5 meters to 7 meters, the distance between two adjacent scaffolding steel pipe trusses 8 is not more than 0.5 meters. The height of the scaffold steel pipe truss 8 is 10 cm to 12 cm smaller than that of the box section beam 1 . The spacing between the horizontal scaffolding steel pipes 3 and the corrugated wood 9 is 20 cm to 30 cm. The upper surface of the wooden template 6 is flush with the top surface of the box-section beam 1 .

脚手架钢管桁架上受线荷载为8.18×2.5＝20.45kN/m，跨度3m，由水平脚手架钢管承受弯矩，最大应力 ${\mathrm{\&sigma;}}_2=\frac{1/{8\mathrm{ql}}^2}{W}=\frac{20.45\&times;{3000}^2}{8\&times;2.327\&times;{10}^7/200}=197.7N/{\mathrm{mm}}^2<[215N/{\mathrm{mm}}^2],$ 竖向脚手架钢管承受剪力，最大应力 ${\mathrm{\&sigma;}}_3=\frac{1/2\mathrm{ql}}{A}=\frac{20.45\&times;3000}{2\&times;289}=106.1N/{\mathrm{mm}}^2<[215N/{\mathrm{mm}}^2].$ 变形验算时，不计剪切变形，模板的荷载为0.3+3.6＝3.9kN/m²，模板最大挠度为 ${\mathrm{\&delta;}}_1=\frac{{5\mathrm{ql}}^4}{384\mathrm{EI}}=\frac{5\&times;3.9\&times;{10}^{-3}\&times;300\&times;{2500}^4}{384\&times;10000\&times;1.33\&times;{10}^7}=4.5\mathrm{mm}<l/250=8\mathrm{mm};$ 脚手架钢管桁架上受线荷载为3.9×2.5＝9.75kN/m，脚手架钢管桁架最大挠度 ${\mathrm{\&delta;}}_2=\frac{{5\mathrm{ql}}^4}{384\mathrm{EI}}=\frac{5\&times;9.75\&times;{3000}^4}{384\&times;2.06\&times;{10}^5\&times;2.327\&times;{10}^7}=2.1mm<l/250=12\mathrm{mm},$ 均满足要求。Example. There is a steel frame structure with a box-section beam spacing of 3m, a scaffolding steel pipe truss with a height of 0.4m and a spacing of 2.5m. The thickness of the wooden formwork is 18mm, the corrugated wood is 50mm×100mm, the distance between the corrugated wood is 300mm, the elastic modulus of the wood is 10000N/mm ² , and the bending strength is 13N/mm ² ; mm Q235 steel, elastic modulus 2.06×10 ⁵ N/mm ² , strength 215N/mm ² . The standard value of dead load is: self-weight of formwork is 0.3kN/m ² , the standard value of live load of 150mm thick ordinary concrete slab is 3.6kN/m ² : construction personnel and equipment 2.5kN/m ² . When checking the bearing capacity, the design value of the load on the formwork is 1.2×3.9+1.4×2.5=8.18kN/m ² , the formwork is a one-way slab with a span of 2.5m, and the maximum bending stress is

The line load on the scaffolding steel pipe truss is 8.18×2.5=20.45kN/m, the span is 3m, and the horizontal scaffolding steel pipe bears the bending moment, the maximum stress ${\mathrm{\&sigma;}}_2=\frac{1/{8\mathrm{ql}}^2}{W}=\frac{20.45\&times;{3000}^2}{8\&times;2.327\&times;{10}^7/200}=197.7N/{\mathrm{<figure-callout\; id="2"\; label="mm"\; filenames="H2009101540449E00011.png"\; state="\{\{state\}\}">mm</figure-callout>}}^2<[215N/{\mathrm{mm}}^2],$ The vertical scaffolding steel pipe bears the shear force, the maximum stress ${\mathrm{\&sigma;}}_3=\frac{1/2\mathrm{ql}}{A}=\frac{20.45\&times;3000}{2\&times;289}=106.1N/{\mathrm{<figure-callout\; id="2"\; label="mm"\; filenames="H2009101540449E00011.png"\; state="\{\{state\}\}">mm</figure-callout>}}^2<[215N/{\mathrm{mm}}^2].$ In the deformation checking calculation, the shear deformation is not included, the load of the formwork is 0.3+3.6=3.9kN/m ² , and the maximum deflection of the formwork is ${\mathrm{\&delta;}}_1=\frac{{5\mathrm{<figure-callout\; id="4"\; label="ql"\; filenames="H2009101540449E00011.png"\; state="\{\{state\}\}">ql</figure-callout>}}^4}{384\mathrm{EI}}=\frac{5\&times;3.9\&times;{10}^{-3}\&times;300\&times;{2500}^4}{384\&times;10000\&times;1.33\&times;{10}^7}=4.5\mathrm{mm}<l/250=8\mathrm{mm};$ The line load on the scaffolding steel pipe truss is 3.9×2.5=9.75kN/m, and the maximum deflection of the scaffolding steel pipe truss ${\mathrm{\&delta;}}_2=\frac{{5\mathrm{<figure-callout\; id="4"\; label="ql"\; filenames="H2009101540449E00011.png"\; state="\{\{state\}\}">ql</figure-callout>}}^4}{384\mathrm{EI}}=\frac{5\&times;9.75\&times;{3000}^4}{384\&times;2.06\&times;{10}^5\&times;2.327\&times;{10}^7}=2.1mm<l/250=12\mathrm{mm},$ All meet the requirements.

Claims (5)

1. a formwork support system for a steel frame structure box girder cast-in-place concrete slab, characterized in that it comprises a box section beam (1), corbels (2), horizontal scaffolding steel pipes (3), vertical scaffolding steel pipes (4 ), steel pipe fasteners (5), wooden formwork (6), tie rod steel pipes (7), corrugated wood (9); 2 horizontal scaffold steel pipes (3) and multiple vertical scaffold steel pipes (4) pass through the steel pipe fasteners (5) Connected to form scaffolding steel pipe trusses (8), more than 2 scaffolding steel pipe trusses (8) and more than 2 tie rod steel pipes (7) are connected by steel pipe fasteners (5), and the corbels (2) are welded to the box section The beam (1), the lower end of the scaffolding steel pipe truss (8) is placed on the corbel (2), the upper end of the scaffolding steel pipe truss (8) is placed with corrugated wood (9), the wooden formwork (6) is placed on the corrugated wood (9), and the corbel ( 2) Use 100×10 angle steel with a length of 200 mm. The length of the welds between the back and tip of the limbs of the corbel (2) and the box-section beam (1) is not less than 100 mm, and the height of the welds is 6 mm. 20 mm from the bottom of the box-section beam. 2. The formwork support system of a steel frame structure box girder cast-in-place concrete slab according to claim 1, wherein when the distance between two adjacent box-shaped beams (1) is less than 3 meters, the adjacent The distance between two scaffold steel pipe trusses (8) is not greater than 2.5 meters; when the distance between two adjacent box-section beams (1) is 3 meters to 5 meters, the distance between two adjacent scaffold steel pipe trusses (8) is not greater than 0.9 meters; When the distance between two adjacent box-section beams (1) is 5 meters to 7 meters, the distance between two adjacent scaffolding steel pipe trusses (8) is not greater than 0.5 meters. 3. the formwork support system of a kind of steel frame structure box girder cast-in-place concrete floor slab according to claim 1, it is characterized in that the height of described scaffolding steel tube truss (8) is smaller than box section beam (1) height 10 cm to 12 cm. 4. the formwork support system of a kind of steel frame structure box girder cast-in-place concrete floor slab according to claim 1, it is characterized in that the spacing of placing corrugated wood (9) on the described horizontal scaffolding steel pipe (3) is 20 centimeters to 30 cm. 5. The formwork support system of a steel frame structure box girder cast-in-place concrete floor slab according to claim 1, characterized in that the upper surface of the wooden formwork (6) and the top surface of the box section beam (1) flush.

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