CN201961969U - Large-scale portal crane girder structure - Google Patents

Abstract

The utility model relates to a large-scale portal crane girder structure, wherein a girder comprises a plurality of sectional beams; each sectional beam has a camber which is calculated according to a camber formula; and when the sectional beams are combined into the girder, smooth and arched curves are respectively formed on the upper and lower surfaces of the girder. The girder structure is conveniently transported and installed, thereby directly promoting the construction progress. By constructing the linear camber, the use ratio of material is enhanced and the cost is lowered.

Description

The large-sized gantry crane main beam structure

Technical field

The utility model is specifically related to a kind of crane girder, particularly a kind of large-sized gantry crane main beam structure.

Background technology

The large-sized gantry crane girder of prior art all is an integral body, and its volume is bigger, and transportation and installation are all inconvenient.Because prior art will be cut according to camber curve after the splicing of girder web finishes again, the volume of girder own is bigger, and cutting process is not easy accuracy control, has too much girder material and is cut, and causes the waste of material, has improved cost.

Summary of the invention

The utility model provides a kind of large-sized gantry crane main beam structure, and purpose is to solve the prior art problem, the girder of provide a kind of convenient transportation, installing, and can not cause the waste of girder material, the degree of utilization of material is higher, and cost-cutting has also guaranteed the camber of girder.

The utility model technical scheme that adopts of dealing with problems is:

The large-sized gantry crane main beam structure, described girder is made of a plurality of segmentation beams, each segmentation beam all has the camber that calculates according to the camber formula, and its upper surface and lower surface formed smooth respectively and have the curve of camber when all segmentation beams were combined together to form girder.

Above-mentioned girder calculates the camber value of each point according to easy formula, and the girder with camber is made of a plurality of segmentation beams, and each segmentation beam is by the prefabricated camber of camber curve value, and each segmentation beam moulding is the straight line camber, has reduced the difficulty of making the curve camber.

The beneficial effects of the utility model: girder is spliced to form by a plurality of segmentation beams, and each segmentation beam all is manufactured with camber in advance.For the bigger girder of span, segmentation both convenient transportation has reduced the also strong assurance of cost of transportation girder camber has reduced the waste of material, has improved the Occupation coefficient of material, cost-cutting.

Description of drawings

Fig. 1 is a structural representation after the assembly unit of the present utility model;

Fig. 2 is the structural representation of single split beam.

The specific embodiment

The utility model is described in further detail below in conjunction with the drawings and specific embodiments.

Large-sized gantry crane main beam structure as shown in Fig. 1, Fig. 2, described girder 1 is made of a plurality of segmentation beams 2, each segmentation beam 2 all has the camber that calculates according to the camber formula, and its upper surface and lower surface formed smooth respectively and have the curve of camber when all segmentation beams 2 were combined together to form girder.Each segmentation beam 2 be one up big and down small trapezoidal, four limits of each segmentation beam are straight line.

When the large gantry crane girder is made, because deadweight, lifting appliance (upper and lower dolly) and the welding deformation of girder itself will cause girder bending-down, so when making, certain camber (camber 〉=following amount of deflection) will be set.

When the segmentation beam was made, its camber separately calculated according to following formula.

Following amount of deflection (f) is divided three parts: (∑ f=f1+f2+f3)

The following amount of deflection that a, lifting appliance (dolly up and down) and weight produce is f1;

The following amount of deflection that b, deadweight produce is f2;

The following amount of deflection that c, making welding deformation produce is f3;

(annotate: a, b can be according to calculating, and the welding winding degree is pressed empirical equation

)

The camber formula: $Y=\frac{4f(L-X)*\mathrm{<figure-callout\; id="2"\; label="X\; L"\; filenames="HSA00000463504800011.png,HSA00000463504800012.png"\; state="\{\{state\}\}">X</figure-callout>}}{L^{}}$

In the formula: amount of deflection summation under the f-;

The L-span (is not meant the span of hoisting crane, and is meant since the first two-section junction arch camber to second from the bottom section junction arch camber end.)；

The X-variable parameter;

The camber calculated example: the calculating of 300t*85m Gantry Crane camber (the arch camber span L=80000mm)

As calculated f1=300mm, f2=100mm, $f3=\frac{1}{1000}*80000=80\mathrm{mm}$

∑f＝f1+f2+f3＝480mm

That is: during X=1, Y1=0.3*79*1=23.7

During X=2, Y1=0.3*78*2=46.8

During X=3, Y1=0.3*77*3=69.3

During X=39, Y 1=0.3*41*39=479.7

During X=40, Y1=0.3*40*40=480

Above-mentioned data are formed camber table and diagram of curves.

According to traffic condition whole girder 1 is carried out the segmentation manufacturing, each segmentation beam 2 moulding is straight line cambers, be one up big and down small trapezoidal, four limits are straight line, have reduced the difficulty of making the curve camber.。

Promptly can obtain the camber of each segmentation beam according to the block plan of making, according to the camber that obtains each segmentation beam 2 be made then.

Make according to camber curve simultaneously and always close up moulding bed, each segmentation beam 2 is lifted on the moulding bed, carry out the welding of single-sided welding double-faced forming to closing up girth welding, the moulding bed in the middle of removing after welding is finished is tested to camber.

Girder 1 is made of a plurality of segmentation beam 2 amalgamations, always is assembled in on-the-spot disposable finishing by segmentation transportation, strong assurance the camber of girder, reduced cost of transportation and directly improved construction speed.

Claims (1)

1. large-sized gantry crane main beam structure, it is characterized in that: described girder is made of a plurality of segmentation beams, each segmentation beam all has the camber that calculates according to the camber formula, and its upper surface and lower surface formed smooth respectively and have the curve of camber when all segmentation beams were combined together to form girder.

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