CN105275121B - Three layers of T-steel laced beam and preparation method thereof - Google Patents

Abstract

The space empty belly lattice building cover board of large span dot point, such as concrete empty stomach sandwich plate floor and steel hollow sandwich panel ceiling for storied building, " waffle slab " of their mechanical model for space three-dimensional stress, superstructure thickness h=(1/25~1/30) L.If figure is dot point superstructure among 20m × 20m, orthogonal spatial grid is 2500 × 2500, height h=20000/25=800, i.e., the thickness of general plate.Figure intermediate point pillar, column bears whole 1/4 loads of superstructure, it is " slab strips on columns " for the i.e. arch without beam for being transmitted load by the laced beam orthogonal with intermediolateral column, the moment of flexure and shearing that it bears are also very big, real abdomen is also made while the section of beam must be increased, the effect of former hollow floor system, loses, the present invention proposes three layers of T-steel laced beam and preparation method thereof, the laced beam of dot point is changed to three layers by bilayer, both ensure requirement for bearing capacity, the effect of making this cross coupling still on an empty stomach, to ensure superstructure empty stomach again.Play the effect of achieving many things at one stroke.

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 production method, building has been saved in its appearance The steel using amount of lid structure, and superstructure is made also to be the use function of ensuring such superstructure empty stomach on an empty stomach herein.

Background technology

With the development of economic construction, in order to which Economization on land promotes Ecological Civilization Construction, the past, a large amount of large span was public With industrial building, individual layer is made, such as lateral and lateral length of side is 150m i.e. (5 × 30m) × (5 × 30m)=22500m², 42 mu of soil or more is accounted for, is such as made three layers of 28 mu of Economization on land, therefore it is the general trend of events that wide span single layer develops to large span multilayer Become, as large span dot point superstructure, key technology is to improve dot point superstructure and two orthogonal side of dot point column X and Y-direction To the rigidity of slab strips on columns, more important is the moment of inertia (I of bending stiffness, i.e. this position_x).For a long time, this dot point For example reinforced concrete ribbed groined slab floor of long-span floor system and H profile steel are just giving cast-in-place concrete to combine groined slab floor, these knots Structure and dot point column intersection area, in order to improve bending stiffness herein, using following method：One：Strutting cap adds hound, The span at this position is reduced, to improve the relative rigidity at this position；Secondly：Beamofframe is set at this position, improves this position The moment of inertia and resistance moment, so as to reduce the direct stress at this position, reduce steel using amount.It is such to occur as soon as from the fifties in last century Traditional structure system, with economic construction and scientific development, this is much unsatisfactory for the demand of modern architecture development, as wanted in superstructure Central air-conditioning, water, electricity, pipeline are set；It is required that reduce dead load keeps superstructure space three-dimensional stress again；It is required that building cover structure fills With monoblock type and industrialization, proposed in succession " assembled integral space steel lattice box structure new system " from inventor in 2007 " series of patents technology, such as ZL200710201934.1, ZL201320375095.6, ZL20111034963.7... ".These It by upper and lower string (rib) is T steel that space lattice superstructure, which is, in grid orthogonal node, connects rectangular steel tube, formed T-steel with The double-deck Castellated beam of square steel tube composition, pairwise orthogonal is to form the empty stomach waffle slab of T-steel between them, and such structure exists Factory process manufactures, and assembled at the scene, forms assembled integral, meets industrial requirement.And solve and improve conventional junction The requirement that structure can not be accomplished.So as to which longspan structure be promoted to develop to multilayer, at this point, in multilayer large-span hollow sandwich panel ceiling for storied building In, there is the problem of identical with traditional groined slab floor, it is necessary to increase substantially the bending resistance that laced beam intersects this beam of direction with pillar Rigidity.Therefore, the T steel laced beam at this position changes into three layers of T steel laced beam by bilayer, its proposition not only still ensures building Exist on an empty stomach in lid, and ensure to increase substantially this position laced beam bending stiffness under the conditions of dead load is reduced.

Invention content

Fig. 1 is《High-rise and Super High large span large area assembled integral steel lattice boxlike " bunchy Tong " structure and making Method》One factory's production unit of (declaring patent), unit plane for square, per edge lengths can be 40m, 50m, So as to form a manufacturing cell, each layer is respectively (1600m by 60m, 72m²、2500m²、3600m²And 5184m²) big face Product, manufacturing cell's centre set factory's manufacture, and on-site consolidation quadrate steel pipe column will be respectively 4 pieces per floor area, such as periphery It is one piece of area 20m × 20m=400m during long 40m², as shown in Fig. 2, these superstructures are that the assembling that factory's manufacture is processed is whole Body formula empty stomach grid cell, when grid is a=2.5m, periphery has that 8 double-deck T steel laced beams are orthogonal respectively, wherein x and Y to there is a laced beam to intersect with intermediolateral column respectively, this two laced beams actually undertake the 1/2 of flooring total load head respectively, so Locate 400m²Flooring working load 5KN/m², with column intersection empty stomach load bearing beam working load P=5KN/m²×200m²= 1000kN, and other two are averagely subjected only to P respectively to orthogonal laced beam₁=8 × 5KN × 1/2 × 2.5²=125KN loads, only Be the former 1/8, the double-deck T steel laced beam intersected at this time with column can only be changed to solid web girder exponentially increasing steel with laced beam Amount, and on column cap plus hound reduces beam span herein and improves the laced beam bending stiffness (EI_x).So, own Superstructure is on an empty stomach solid at this, superstructure is caused to be formed on an empty stomach illusory.Fig. 3 be superstructure bilayer laced beam side elevational view, each net Lattice have on an empty stomach, and become real abdomen on an empty stomach with column intersection, make the interior part on an empty stomach of large-scale floor that cannot install the water such as air-conditioning, water power Flat pipeline hinders this patented technology superiority and gives full play to.Thus the present invention propose three layers of T steel empty stomach girder construction, i.e., with Intermediate steel column intersects the laced beam and is changed to three layers by bilayer, as shown in figure 4, its upper two layers T steel and square steel tube form greatly across Empty stomach grid superstructure is spent, and is extended square steel tube, and on its bottom edge and the intermediolateral column side of intersecting below double-deck laced beam herein To adding a T steel, after this position T steel upper, middle and lower-ranking setting, each upper and lower two cavities of grid protocol, by Fig. 4 Section 1-1 is taken, sectional view shown in Fig. 5, the setting of T steel upper, middle and lower can be obtained.When large span hollow floor system is straight with intermediolateral column Junction is connect, three layers of T steel laced beam (Fig. 4, Fig. 5) are changed to by double-deck T steel laced beam.Since this position is changed to three layers of T shapes At the same time steel laced beam, bending stiffness increase substantially, this position is still kept on an empty stomach.So as to solve large span, big face Product space steel lattice box structure superstructure abdomen makees the function that the horizontally disposed mechanical floor of air-conditioning, hydroelectric line uses on an empty stomach.

Description of the drawings

Attached drawing 1 is high-rise empty with the square of whole steel lattice boxlike " bunchy Tong " structure of Super High large span large area assembling Belly lattice superstructure cell floor plan；

In the square empty stomach grid superstructure cell floor plan of 2 attached drawing of attached drawing 1 1/4 empty stomach network layout drawing of the lower right corner and Factory's production unit divides figure；

In 3 empty stomach grid superstructure of attached drawing x to or y to double-deck T steel laced beam side elevational view；

Attached drawing 4 is connected directly three layers of T steel laced beam side elevational view at position with unit plane intermediolateral column；

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

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

Specific embodiment

Fig. 1 is large span (L₁=20m, 25m, 30m, 36m) large area (F=1600m²、2500m²、3600m²、 5184m²) steel hollow sandwich panel ceiling for storied building mesh generation plan view, Fig. 2 be Fig. 1 lower right corner (southeast corner) 1/4 area grid cell Plan view.Except x is to, in addition to directly crossing with intermediate steel column, superstructure all sites are made double-deck T steel laced beam, and press with y Factory's production unit (1,2,3,4) is divided shown in Fig. 2 as shown in figure 3, the empty stomach for understanding directly to cross with intermediolateral column from Fig. 1, Fig. 2 Beam, it undertakes the working load and dead load of 1/2 area of flooring, itself must be significantly increased in laced beam herein Bearing capacity and rigidity, traditional method are that double-deck T steel laced beam (Fig. 3) is changed to I-shaped solid web girder, and enlarging section With increasing deck-molding, if be still unsatisfactory for, then hound added to reach at this beam both ends and reduce the work that span improves bearing capacity and stiffness With so not only increasing steel using amount and improve cost, more main both direction herein is real abdomen, and former superstructure is on an empty stomach The effect of playing equipment installation interlayer completely loses.Three layers of T steel Castellated beam proposed by the present invention solves above-mentioned difficulties, Fig. 4 For the side elevational view of three layers of T shape Castellated beams, Fig. 5 beam sectional views thus, its empty stomach here not only retains, but also increase One layer of empty stomach, and reduce structural steel amount.It is equal to intersect with column both sides span with plane shown in Fig. 1,2, is L=20m, building Area load transmits support column by this beam, it is necessary to exponentially improve this laced beam bearing capacity and rigidity.This sentences L₁=20m For, it is described as follows：Fig. 6 is three layers of T steel laced beam sectional view, upper strata T steel web downwards, middle level and lower floor's T steel abdomen Plate is upward (inversion), superstructure 20m × 20m=400m²In the range of be bilayer, i.e., herein it is upper, in two layer height h₁=800, it Reduced moment of inertia I_x1=94424cm⁴, lower floor's T steel and middle level T steel spacing 600, the folding of entire three layers of T steel laced beam Calculate the moment of inertia I_x2=313068cm⁴, ratio between two I_x2/I_x1=313068/94424=3.3 times, i.e., three layers of T steel are on an empty stomach herein The reduced moment of inertia of beam is other 3.3 times of position bilayer T steel laced beams of superstructure, though the load that superstructure is born herein is big, it Bending stiffness (EI) increase into n times, solve the deformation of rigidity of structure deficiency it is excessive while, since the moment of inertia increases substantially, The conversion resistance moment of three layers of T steel laced beam also increases into n times, flexural deformation cause the tension that upper and lower T steel generates, by Compression also declines into n times of ground.Three layers of T steel laced beam propose, have both saved project cost, also ensure that and are deposited on an empty stomach among superstructure As the interlayer of equipment installation the effect of.

Claims (1)

1. a kind of three layers of T-steel laced beam, are made of, which is characterized in that thereon upper, middle and lower-ranking T section steel with square steel tube Two layers of face T steel forms large span empty stomach grid superstructure with square steel tube, prolongs square steel tube below the double-deck laced beam of formation It is long, and intersect direction with intermediolateral column on square steel bottom of the tube edge and add a T steel, this position T steel upper, middle and lower-ranking setting, Each grid protocol two cavities up and down, that is, each grid x to or y to there is two layers of empty stomach space, it is ensured that whole assembling is empty Between the centre of empty stomach grid superstructure of steel lattice box structure be free stern layer.