CN105275121A - Three-layer T-shaped steel vierendeel beam and manufacturing method thereof - Google Patents

Abstract

The mechanical model of a special vierendeel grid floor slab supported by large-span points, for example a concrete vierendeel sandwich plate floor slab and a steel vierendeel sandwich plate floor slab, is a grid plate which is stressed in spatial 3D, and the thickness of a floor slab is h=(1/25-1/30)L. A figure is a 20 m*20 m intermediate point supporting floor slab, the orthogonal and ortho-laid grid of the floor slab is 2500*2500, and height h=20000/25=800, and the height is the thickness of an ordinary plate. A strut on the central point in the figure bears 1/4 load of the whole floor slab, and the strut is a column strip of a flat slab which transfers load through the vierendeel beams which are orthorhombic with the center column, the bending moment and shearing force the strut bears are large, so the cross section of the beam must be enlarged, and the cross section should be made in solid web, and effects of an original vierendeel floor slab are lost. The invention provides the three-layer T-shaped steel vierendeel beam and a manufacturing method thereof. The vierendeel beams supported by points is changed into three layers from two layers, thereby ensuring requirements of bearing capacity, and the cross beam is still vierendeel, ensuring effects of vierendeel floor slab. The three-layer T-shaped steel vierendeel beam achieves multiple purposes.

Description

Three layers of T-steel laced beam and preparation method thereof

The present invention relates to large span multilayer and upper space steel lattice superstructure preparation method, its appearance, has namely saved the steel using amount of building cover structure, makes again superstructure also be guarantee this type of superstructure using function on an empty stomach on an empty stomach herein.

Background technology

Along with the development of economic construction, in order to Economization on land promotes Ecological Civilization Construction, public and the industrial construction of past a large amount of large span, is all made individual layer, as the horizontal and horizontal length of side is 150m i.e. (5 × 30m) × (5 × 30m)=22500m ²account for more than 42 mu, soil, as being made three layers of Economization on land 28 mu, therefore wide span single layer is trend of the times to the development of large span multilayer, as large span dot point superstructure, its key technology improves the rigidity of dot point superstructure and dot point post X and Y-direction pairwise orthogonal direction slab strips on columns, more importantly bending rigidity, the i.e. moment of inertia (I at this position _x).For a long time, this dot point long-span floor system such as reinforced concrete ribbed groined slab floor and H profile steel are just giving cast-in-situ concrete to combine groined slab floor, these structures and dot point post intersection area, in order to improve bending rigidity herein, adopt following way: one: add cap or add hound, namely reduce the span at this position, improve the relative rigidity at this position; Its two: establish beamofframe at this position, improve moment of inertia and the resistance moment at this position, thus reduce the normal stress at this position, reduce steel using amount.The traditional structure system that this kind just occurred from the fifties in last century, along with economic construction and scientific development, this far from meets the demand of modern architecture development, as arranged central air-conditioning, water, electricity, pipeline in superstructure; Require that reducing dead load keeps again superstructure space three-dimensional stressed; Require building cover structure assembled integral and industrialization, in succession propose " assembled integral Steel Space grid box structure new system " " series of patents technology, as ZL200710201934.1, ZL201320375095.6, ZL20111034963.7... etc. " from inventor in 2007.These space lattice superstructures are T steel by upper and lower string (rib), at grid orthogonal node, connect rectangular steel tube, the double-deck Castellated beam that formation T-steel and square steel pipe form, between them, namely pairwise orthogonal forms the empty stomach waffle slab of T-steel, and this kind of structure is all in factory process manufacture, and assembled at the scene, form assembled integral, meet industrial requirement.And solve and improve the requirement that traditional structure cannot accomplish.Thus promote that longspan structure develops to multilayer, now, in multilayer large-span hollow sandwich panel ceiling for storied building, there is the problem identical with traditional groined slab floor, the bending rigidity of this beam of laced beam direction crossing with pillar must be increased substantially.Therefore, the T steel laced beam at this position changes into three layers of T steel laced beam by bilayer, and its proposition not only still ensures to exist on an empty stomach in superstructure, and guarantees to increase substantially this position laced beam bending rigidity under reduction dead load condition.

Summary of the invention

Fig. 1 is a produce in factory unit of " high-rise and Super High large span large area assembled integral steel lattice boxlike " bunchy Tong " structure and preparation method " (declaring patent), unit plane is square, every edge lengths can be 40m, 50m, 60m, 72m thus forms a manufacturing cell, and every one deck is respectively (1600m ², 2500m ², 3600m ²and 5184m ²) large area, manufacturing cell's centre establishes factory to manufacture, and on-site consolidation quadrate steel pipe column, is respectively 4 pieces by every floor area, during as Zhou Bianchang 40m, is one piece of area 20m × 20m=400m ²as shown in Figure 2, these superstructures are the assembled integral grid cell on an empty stomach that factory manufactures processing, when grid is a=2.5m, periphery has 8 double-deck T steel laced beams orthogonal respectively, wherein x and y is to there being a laced beam crossing with intermediolateral column respectively, and this two laced beams reality bears 1/2 of flooring total load respectively, as 400m herein ²flooring service load 5KN/m ², carry service load P=5KN/m with post intersection laced beam ²× 200m ²=1000kN, and other two on average only bear P respectively to orthogonal laced beam ₁=8 × 5KN × 1/2 × 2.5 ²=125KN load, be only the former 1/8, now crossing with post double-deck T steel laced beam can only change solid web girder into laced beam and strengthen steel using amount exponentially, and add on column cap hound reduce herein beam span to improve this laced beam bending rigidity (EI _x).So, all superstructure empty stomaches are solid at this place, cause superstructure to be formed on an empty stomach illusory.Fig. 3 is the double-deck laced beam side elevational view of superstructure, and each grid all has on an empty stomach, and becomes real abdomen on an empty stomach with post intersection, makes the horizontal pipelines such as empty stomach part in large-scale floor can not install an air-conditioner, water power, hinders this patented technology superiority and give full play to.The present invention proposes three layers of T steel laced beam structure for this reason, namely three layers are changed at this laced beam crossing with middle steel column into by bilayer, as shown in Figure 4, its upper two layers T steel and square steel pipe form large span grid superstructure on an empty stomach, and below square steel pipe is extended at this double-deck laced beam, and a T steel is set up along direction crossing with intermediolateral column bottom it, after this position T steel upper, middle and lower-ranking is arranged, upper and lower two cavities of each grid protocol, Fig. 4 is got section 1-1, can obtain sectional drawing shown in Fig. 5, its T steel upper, middle and lower are arranged.When large span hollow floor system is in junction direct with intermediolateral column, change three layers of T steel laced beam (Fig. 4, Fig. 5) into by double-deck T steel laced beam.Because this position changes three layers of T steel laced beam into, its bending rigidity increases substantially meanwhile, and this position still keeps on an empty stomach.Thus solve the function that large span, large area space steel lattice box structure superstructure belly make air-conditioning on an empty stomach, the mechanical floor of hydroelectric line horizontal arrangement uses.

Accompanying drawing explanation

Accompanying drawing 1 high level and Super High large span large area assemble the square grid superstructure cell floor plan on an empty stomach of overall steel grid boxlike " bunchy Tong " structure;

The lower right corner 1/4 network arrangement diagram and produce in factory dividing elements figure on an empty stomach in accompanying drawing 2 accompanying drawing 1 square empty stomach grid superstructure cell floor plan;

Accompanying drawing 3 on an empty stomach in grid superstructure x to or y to double-deck T steel laced beam side elevational view;

Accompanying drawing 4 and unit plane intermediolateral column are directly connected three layers of T steel laced beam side elevational view at position;

The sectional drawing of accompanying drawing 5 three layers of T steel laced beam, its both sides are also double-deck grid superstructure on an empty stomach;

Accompanying drawing 6 three layers of T steel laced beam, the geometrical relationship between its upper, middle and lower T steel and reduced moment of inertia solve figure.

Detailed description of the invention

Fig. 1 is large span (L ₁=20m, 25m, 30m, 36m) large area (F=1600m ², 2500m ², 3600m ², 5184m ²) the stress and strain model plan view of steel hollow sandwich panel ceiling for storied building, Fig. 2 is Fig. 1 lower right corner (southeast corner) 1/4 area grid cell plan view.Except x to y to except directly crossing with middle steel column, superstructure all sites is all made double-deck T steel laced beam, and press the produce in factory of division shown in Fig. 2 unit (1, 2, 3, 4) as shown in Figure 3, from Fig. 1, the known laced beam directly crossed with intermediolateral column of Fig. 2, it bears service load and the dead load of flooring 1/2 area, laced beam herein must the supporting capacity of raising itself and rigidity significantly, traditional method changes double-deck T steel laced beam (Fig. 3) into I-shaped solid web girder, and enlarging section and increasing deck-molding, if when still not meeting, add hound again at these beam two ends and reach the effect reducing span raising bearing capacity and stiffness, so not only increase steel using amount and improve cost, main both direction is herein real abdomen, effect that former superstructure plays equipment installation interlayer on an empty stomach completely loses.Three layers of T steel Castellated beam that the present invention proposes solve above-mentioned difficulties, and Fig. 4 is the side elevational view of three layers of T-shaped Castellated beam, and Fig. 5 is beam sectional drawing for this reason, and its empty stomach herein not only retains, but also adds one deck on an empty stomach, and reduces structural steel amount.Equal with the both sides crossing with post of plane shown in Fig. 1,2 span, be L=20m, floor load all transmits bearing post by this beam, must improve this laced beam supporting capacity and rigidity exponentially.This sentences L ₁=20m is example, is described as follows: Fig. 6 is three layers of T steel laced beam sectional drawing, upper strata T steel web downwards, middle level and lower floor's T steel web upwards (inversion), superstructure 20m × 20m=400m ²be bilayer in scope, namely herein upper, in two layer height h ₁=800, its reduced moment of inertia I _x1=94424cm ⁴, lower floor's T steel and middle level T steel spacing 600, the reduced moment of inertia I of whole three layers of T steel laced beam _x2=313068cm ⁴, ratio between two I _x2/ I _x1=313068/94424=3.3 doubly, namely the reduced moment of inertia of three layers of T steel laced beam is the double-deck T steel laced beams 3.3 times in other positions of superstructure herein, though the load that superstructure bears is large herein, but its bending rigidity (EI) becomes n doubly to increase, while the distortion of solution rigidity of structure deficiency is excessive, because moment of inertia increases substantially, the conversion resistance moment of three layers of T steel laced beam also becomes n doubly to increase, and the tension that its flexural deformation causes upper and lower T steel to produce, compression chord also become n doubly to decline.Three layers of T steel laced beam propose, and have both saved construction costs, guarantee again to there is the effect doubling as the interlayer of equipment installation in the middle of superstructure on an empty stomach.

Claims (4)

1. the Castellated beam be made up of upper, middle and lower-ranking T section steel and square steel pipe, its each grid x to or y all have two-layer empty stomach space to grid, guarantee that all there is free stern layer the centre of the empty stomach grid superstructure of assembled integral Steel Space grid box structure, form interlayer in order to water, electricity, fire-fighting horizontal pipeline horizontal arrangement.

2., under identical span and loading condition, the bending rigidity of three layers of T steel laced beam, than the bending rigidity large (3 ~ 5) times of double-deck T steel laced beam, increases substantially large span, the ability of dot point steel hollow sandwich panel ceiling for storied building resistance to deformation.

3., under identical span and loading condition, the supporting capacity of three layers of T steel laced beam improves (3 ~ 5) doubly than the supporting capacity of double-deck T steel laced beam.

4. three layers of T steel laced beam large-span steel hollow sandwich panel ceiling for storied building of being mainly used in multi-point support and large span intermediolateral column are directly connected the laced beam at position, the laced beam of this part bears dot point floor load 50%, after adopting three layers of T steel laced beam, in the constant situation of its shear stiffness, increase substantially the Rigidity and strength of structure, meanwhile, this part still can accomplish dot point and large span, reaches the energy saving and emission reduction effects reducing steel using amount.