CN105921625B - Rotate the processing method of steel box-girder - Google Patents
Rotate the processing method of steel box-girder Download PDFInfo
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- CN105921625B CN105921625B CN201610251208.XA CN201610251208A CN105921625B CN 105921625 B CN105921625 B CN 105921625B CN 201610251208 A CN201610251208 A CN 201610251208A CN 105921625 B CN105921625 B CN 105921625B
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- sector ring
- side edge
- girder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/20—Making tools by operations not covered by a single other subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D47/00—Making rigid structural elements or units, e.g. honeycomb structures
- B21D47/01—Making rigid structural elements or units, e.g. honeycomb structures beams or pillars
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F11/00—Stairways, ramps, or like structures; Balustrades; Handrails
- E04F11/02—Stairways; Layouts thereof
- E04F11/022—Stairways; Layouts thereof characterised by the supporting structure
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a kind of processing method for rotating steel box-girder, first according to the interior plate structural parameters drawing three-dimensional model of steel box-girder, coordinate points are set up at interval on the upper side edge and lower side of interior plate in the three-dimensional model, and projection obtains projection coordinate's point, and projection line is obtained according to projection join line, then rotation steel box-girder processing mold is made according to projection line, anchor point is determined according to projection coordinate's point in rotation steel box-girder processing mold, the interior plate of steel box-girder is processed further according to anchor point, then the top plate and bottom plate of steel box-girder are welded in repositioning, and according to completed last block outer panel of three face positioning weldings, last seam crossing full weld.The present invention makes corresponding processing mold according to the projection of steel box-girder interior plate, making steel box-girder is being processed according to processing mold, make the processing of steel box-girder simpler, dimensional accuracy is high, it is disposable to complete bending shaping, no longer the later stage is handled, and is reduced the work load of workers processing, is improved processing efficiency.
Description
Technical field
The present invention relates to spiral stairses manufacture field, and in particular to a kind of processing method of rotation steel box-girder.
Background technology
Spiral stairses are commonly referred to as spiral shape or winding stairs, because its streamline is handsome in appearance, graceful, elegance, space
On compare saving, be usually used in the few office building of number of floor levels, residential building or be arranged in garden as architectural featurette or interior is used.
The agent structure of current spiral stairses is divided into two kinds, and one kind is column, and usual this stair are, around a single-column arrangement, to put down
Face is rounded, its platform and to mark time be fan-shaped plan, inboard width very little of marking time, and forms the steeper gradient, such stair
Stress point there was only single-column one, when people walking on the outside of it when, pedal be in vibrating state, there is potential safety hazard, only limit 1 people
Or 2 people pass through, it is adaptable in various small buildings；Another is loop type, and this stair include annular side bar, outer annular
Side bar and some pedals being arranged between the annular side bar and the outer ring beam, such stair section are big,
Current flow of the people can be carried also big.In order to disclosure satisfy that safety requirements in intensity, annular side bar, outer ring beam are adopted
With steel box girder, but this steel box-girder generally bending shape, when blanking processing and fabricating, because bending shape is fixed
Position is difficult, and the steel box-girder dimensional accuracy completed after bending shape is low, and the steel box-girder bending degree after so machining is inconsistent,
Steel box-girder inside and outside resulting in can not be corresponding, pedal can not be completed installation, and such workman will be carried out to steel box-girder
Later stage is adjusted, and is not only increased the work load of workman, is extended the set-up time, reduces processing efficiency.
The content of the invention
For above-mentioned the deficiencies in the prior art, the technical problems to be solved by the invention are：A kind of processing how is provided to hold
Easily, workers processing work load is reduced, processing efficiency is improved so that the steel box-girder dimensional accuracy after bending shape is machined high
Rotation steel box-girder processing method.
In order to solve the above-mentioned technical problem, present invention employs following technical scheme：
A kind of processing method for rotating steel box-girder, it is characterised in that：Painted first according to the interior plate structural parameters of steel box-girder
Threedimensional model processed, the upper side edge of interior plate is spaced along its length in the three-dimensional model sets up upper side edge coordinate points A1、B1、C1、
D1……O1, lower side is spaced along its length sets up lower side coordinate points A2、B2、C2、D2……O2, then respectively by upside
Side coordinate points and lower side coordinate points are vertically projected on the level reference set below the threedimensional model
Obtain upper side edge projection coordinate point A’ 1、B’ 1、C’ 1、D’ 1……O’ 1With lower side projection coordinate point A’ 2、B’ 2、C’ 2、D’ 2……O’ 2,
Upper side edge projection coordinate point is sequentially connected and obtains upper side edge projection line, lower side projection coordinate point is sequentially connected and obtains downside
Side projection line, then according to the upper side edge projection coordinate point, the lower side projection coordinate point, the upper side edge projection line and
Lower side projection line makes a kind of rotation steel box-girder processing mold；
The rotation steel box-girder processing mold includes the upper side edge arc positioning strip being oppositely arranged and the positioning of lower side arc
Bar, plane is parallel to plane where the lower side arc positioning strip, the upper side edge where the upper side edge arc positioning strip
The radius of arc positioning strip is equal to the radius of the upper side edge projection line, and the radius of the lower side arc positioning strip is equal to described
The radius of lower side projection line, the distance between the upper side edge arc positioning strip and the lower side arc positioning strip, which are equal to, to be treated
The width of steel box-girder interior plate is processed, is set below the upper side edge arc positioning strip and the lower side arc positioning strip
Have and many are fixedly connected with base, the base are able to the upper side edge arc positioning strip and the lower side arc
The support bar that positioning strip is supported；
By upper side edge projection coordinate point A’ 1、B’ 1、C’ 1、D’ 1……O’ 1Along perpendicular to the upper side edge projection line direction projection
Upper side edge anchor point a is obtained on to the upper side edge arc positioning strip positioned at plane where the upper side edge arc positioning strip1、
b1、c1、d1……o1, by lower side projection coordinate point A’ 2、B’ 2、C’ 2、D’ 2……O’ 2Along perpendicular to the lower side projection line side
Lower side is obtained on the lower side arc positioning strip of plane determine to projecting to where the lower side arc positioning strip
Site a2、b2、c2、d2……o2, one piece and the width identical stripe board I according to steel box-girder interior plate to be processed are then obtained,
It is welded on the side side of stripe board I is corresponding with upper side edge anchor point on upper side edge arc positioning strip, by the bar shaped
The opposite side side of plate I is corresponding with lower side anchor point to be welded on lower side arc positioning strip, then obtains one piece of fan respectively
Ring flat-plate I and one piece of sector ring board II, the internal diameter of the sector ring board I are equal to the radius of upper side edge projection line, the sector ring board II it is interior
Footpath is equal to the radius of lower side projection line, and the width of the sector ring board I is equal to the width of steel box-girder top plate to be processed, the fan ring
The width of plate II is equal to the width of steel box-girder bottom plate to be processed, and the peace of sector ring board I is set up respectively at the two ends of the internal diameter of sector ring board I
Set site a‘ 1And o’ 1, sector ring board I is set up at the midpoint of the internal diameter of sector ring board I anchor point h is installed’ 1, in the sector ring board II
The two ends of internal diameter set up sector ring board I and install anchor point a respectively‘ 2And o’ 2, sector ring board is set up at the midpoint of the internal diameter of sector ring board II
II installs anchor point h’ 2, the sector ring board I and the sector ring board II are then respectively welded to the both sides side of the stripe board I
On, when welding, sector ring board I installs anchor point a‘ 1、h’ 1、o’ 1With upper side edge anchor point a1、h1、o1Correspondence is in the bar shaped
Position on plate I is welded, and sector ring board II installs anchor point a‘ 2、h’ 2、o’ 2With upper side edge anchor point a2、h2、o2Correspondence is in institute
The position stated in stripe board I is welded, and the stripe board II of one piece and the same widths of stripe board I is then obtained, by the bar shaped
Plate II both sides side respectively with the sector ring board I and the external diameter arc-shaped side positioning welding of the sector ring board II, finally to each company
Meet place and carry out full weld processing.
In the present invention, the interior plate of steel box-girder is first chosen as the datum plate of processing, interior plate in the vertical direction
A projection arcuate line segment is projected as, similarly the point above and below interior plate on two sides is all projected in this projection arcuate line segment
On, it can be understood as interior plate rotates around a cylinder, and the radius of this cylinder is equal to interior plate and projects arcuate line segment
Radius.Line has a several points composition, certainly many points can also structure it is into a line, choose interior plate upper side edge and downside
Several coordinate points on side are projected, and its projection coordinate's point is attached respectively, obtain two coordinate points curved lines
Section.This two coordinate points arcuate line segments can approximately regard identical with the radius for projecting arcuate line segment as, certainly, the coordinate points of projection
More, the radius of coordinate points arcuate line segment is just closer to projection arcuate line segment.Obtain after this two coordinate points arcuate line segments, according to
This two coordinate points arcuate line segments are translated corresponding distance by the width of interior plate, and correspondence obtains interior plate upper side edge and downside
The shape on side, then makes a processing mold according to this two coordinate points arcuate line segments.Processing mold, which includes two arcs, to be determined
Support bar on position bar and base, base is used to be supported arc positioning strip, and this two arc positioning strips are correspondences
Two preceding coordinate points arcuate line segments are made, thus the shape of this two arc positioning strips be exactly interior plate upper side edge and under
The corresponding shape in side.By the way that the lower side and lower side of stripe board I are corresponded in two arc positioning strips, in basis respectively
Welded with the projection coordinate corresponding anchor point thereon of point, by interior plate positioning welding on arc positioning strip, now,
The shape of interior plate is just consistent with the bending shape of steel box-girder.
The top plate and bottom plate of same steel box-girder are also to be rotated around cylinder, then the curved inner radius of top plate and bottom plate is just
Equal to the radius of projection arcuate line segment, the internal diameter of two pieces of sector ring boards is positioned, 3 points can determine a plane, so will
The end points at sector ring board internal diameter two ends between midpoint difference positioning welding the three of steel box-girder is completed in stripe board I, just
Individual face.On the premise of in these three faces, location and installation is completed, remaining is connect again after remaining one piece of stripe board II is welded up
The processing and fabricating of steel box-girder can be completed by sowing weldering.The steel box-girder bending shape that so processing and fabricating comes out in place, dimensional accuracy
Height, while being processed according to mould, disposable to complete bending shaping, the no longer later stage is handled, and reduces the work of workers processing
Burden, improves processing efficiency.
As optimization, after the sector ring board I and the sector ring board II complete positioning welding, positioned at the sector ring board I
Polylith reinforcing plate is set along the length direction uniform intervals of stripe board I in the stripe board I between the sector ring board II,
Reinforcing plate is welded to connect with the stripe board I, the sector ring board I and the sector ring board II respectively.The strong of steel box-girder can be increased
Degree, it is to avoid it is influenceed to deform by self gravitation, improves the degree of accuracy of size.
In summary, the beneficial effects of the present invention are：The present invention makes corresponding according to the projection of steel box-girder interior plate
Processing mold, is being processed making steel box-girder according to processing mold, is making the processing of steel box-girder simpler, while processing and fabricating
In place, dimensional accuracy is high for steel box-girder bending shape out, disposable to complete bending shaping, and the no longer later stage is handled, and is reduced
The work load of workers processing, improves processing efficiency.
Brief description of the drawings
In order that the purpose, technical scheme and advantage of invention are clearer, the present invention is made into one below in conjunction with accompanying drawing
The detailed description of step, wherein：
Fig. 1 is the perspective view of steel box-girder interior plate threedimensional model in the vertical direction in the present invention；
Fig. 2 is the front view of rotation steel box-girder processing mold in the present invention；
Fig. 3 is the side view of rotation steel box-girder processing mold in the present invention.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
As shown in Figure 1 to Figure 3, the direction of arrow in Fig. 1 is the projecting direction of upper side edge coordinate points and lower side coordinate points,
The processing method of rotation steel box-girder in present embodiment, first according to the interior plate structural parameters drawing three-dimensional of steel box-girder
Model, the upper side edge of interior plate is spaced along its length in the three-dimensional model sets up upper side edge coordinate points A1、B1、C1、D1……
O1, lower side is spaced along its length sets up lower side coordinate points A2、B2、C2、D2……O2, then respectively by upper side edge coordinate
Point and lower side coordinate points are vertically projected to be obtained on the level reference set below the threedimensional model
Side projection coordinate point A’ 1、B’ 1、C’ 1、D’ 1……O’ 1With lower side projection coordinate point A’ 2、B’ 2、C’ 2、D’ 2……O’ 2, by upside
Side projection coordinate point, which is sequentially connected, obtains upper side edge projection line, and lower side projection coordinate point is sequentially connected and obtains lower side projection
Line, then according to the upper side edge projection coordinate point, the lower side projection coordinate point, the upper side edge projection line and lower side
Projection line makes a kind of rotation steel box-girder processing mold；
The rotation steel box-girder processing mold includes the upper side edge arc positioning strip 1 being oppositely arranged and the positioning of lower side arc
Bar 2, the place plane of upper side edge arc positioning strip 1 is parallel to the place plane of lower side arc positioning strip 2, the upside
The radius of side arc positioning strip 1 is equal to the radius of the upper side edge projection line, and the radius of the lower side arc positioning strip 2 is equal to
The distance between the radius of the lower side projection line, the upper side edge arc positioning strip 1 and described lower side arc positioning strip 2
Equal to the width of steel box-girder interior plate to be processed, positioned at the upper side edge arc positioning strip 1 and the lower side arc positioning strip 2
Lower section be provided with base 3, being fixedly connected with many on the base 3 is able to the upper side edge arc positioning strip 1 and institute
State the support bar 4 that lower side arc positioning strip 2 is supported；
By upper side edge projection coordinate point A’ 1、B’ 1、C’ 1、D’ 1……O’ 1Along perpendicular to the upper side edge projection line direction projection
Upper side edge anchor point a is obtained on to the upper side edge arc positioning strip positioned at plane where the upper side edge arc positioning strip1、
b1、c1、d1……o1, by lower side projection coordinate point A’ 2、B’ 2、C’ 2、D’ 2……O’ 2Along perpendicular to the lower side projection line side
Lower side is obtained on the lower side arc positioning strip of plane determine to projecting to where the lower side arc positioning strip
Site a2、b2、c2、d2……o2, one piece and the width identical stripe board I according to steel box-girder interior plate to be processed are then obtained,
It is welded on the side side of stripe board I is corresponding with upper side edge anchor point on upper side edge arc positioning strip, by the bar shaped
The opposite side side of plate I is corresponding with lower side anchor point to be welded on lower side arc positioning strip, then obtains one piece of fan respectively
Ring flat-plate I and one piece of sector ring board II, the internal diameter of the sector ring board I are equal to the radius of upper side edge projection line, the sector ring board II it is interior
Footpath is equal to the radius of lower side projection line, and the width of the sector ring board I is equal to the width of steel box-girder top plate to be processed, the fan ring
The width of plate II is equal to the width of steel box-girder bottom plate to be processed, and the peace of sector ring board I is set up respectively at the two ends of the internal diameter of sector ring board I
Set site a‘ 1And o’ 1, sector ring board I is set up at the midpoint of the internal diameter of sector ring board I anchor point h is installed’ 1, in the sector ring board II
The two ends of internal diameter set up sector ring board I and install anchor point a respectively‘ 2And o’ 2, sector ring board is set up at the midpoint of the internal diameter of sector ring board II
II installs anchor point h’ 2, the sector ring board I and the sector ring board II are then respectively welded to the both sides side of the stripe board I
On, when welding, sector ring board I installs anchor point a‘ 1、h’ 1、o’ 1With upper side edge anchor point a1、h1、o1Correspondence is in the bar shaped
Position on plate I is welded, and sector ring board II installs anchor point a‘ 2、h’ 2、o’ 2With upper side edge anchor point a2、h2、o2Correspondence is in institute
The position stated in stripe board I is welded, and the stripe board II of one piece and the same widths of stripe board I is then obtained, by the bar shaped
Plate II both sides side respectively with the sector ring board I and the external diameter arc-shaped side positioning welding of the sector ring board II, finally to each company
Meet place and carry out full weld processing.
In present embodiment, after the sector ring board I and the sector ring board II complete positioning welding, positioned at described
Polylith is set along the length direction uniform intervals of stripe board I in the stripe board I between sector ring board I and the sector ring board II
Reinforcing plate, reinforcing plate is welded to connect with the stripe board I, the sector ring board I and the sector ring board II respectively.
During specific implementation, before welding, its center is deviateed on edge respectively for the stripe board I and the stripe board II
Line direction first carries out thick volume processing to it, makes the bending radius of the stripe board I and the stripe board II close on the inside of steel box-girder
The bending radius of plate and outer panel, such stripe board I and stripe board II are more prone to when positioning welding, workers processing energy
It is enough easily to be welded the side correspondence of its both sides, the working strength of workers processing is reduced, while also improving work
Efficiency.
It can in addition contain so do, when the positioning welding of stripe board I is on the upper side edge arc positioning strip, along described
Upper side edge anchor point a1、b1、c1、d1……o1Order is welded successively, and the positioning welding of stripe board I is in the lower side arc
When on shape positioning strip, along the lower side anchor point a2、b2、c2、d2……o2Order is welded successively.So welded successively
The bending precision of stripe board I can be improved by connecing, so as to get steel box-girder size it is more accurate.
Finally illustrate, the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted, although pass through ginseng
According to the preferred embodiments of the present invention, invention has been described, it should be appreciated by those of ordinary skill in the art that can
So that various changes are made to it in the form and details, the present invention limited without departing from appended claims
Spirit and scope.
Claims (2)
1. a kind of processing method for rotating steel box-girder, it is characterised in that：Drawn first according to the interior plate structural parameters of steel box-girder
Threedimensional model, the upper side edge of interior plate is spaced along its length in the three-dimensional model sets up upper side edge coordinate points A1、B1、C1、
D1……O1, lower side is spaced along its length sets up lower side coordinate points A2、B2、C2、D2……O2, then respectively by upside
Side coordinate points and lower side coordinate points are vertically projected on the level reference set below the threedimensional model
Obtain upper side edge projection coordinate point A’ 1、B’ 1、C’ 1、D’ 1……O’ 1With lower side projection coordinate point A’ 2、B’ 2、C’ 2、D’ 2……O’ 2,
Upper side edge projection coordinate point is sequentially connected and obtains upper side edge projection line, lower side projection coordinate point is sequentially connected and obtains downside
Side projection line, then according to the upper side edge projection coordinate point, the lower side projection coordinate point, the upper side edge projection line and
Lower side projection line makes a kind of rotation steel box-girder processing mold；
The rotation steel box-girder processing mold includes the upper side edge arc positioning strip and lower side arc positioning strip being oppositely arranged, institute
Plane where stating upper side edge arc positioning strip is determined parallel to plane where the lower side arc positioning strip, the upper side edge arc
The radius of position bar is equal to the radius of the upper side edge projection line, and the radius of the lower side arc positioning strip is equal to the lower side
The distance between the radius of projection line, the upper side edge arc positioning strip and described lower side arc positioning strip are equal to steel to be processed
The width of box beam interior plate, bottom is provided with positioned at the lower section of the upper side edge arc positioning strip and the lower side arc positioning strip
Many are fixedly connected with seat, the base to be able to the upper side edge arc positioning strip and lower side arc positioning
The support bar that bar is supported；
By upper side edge projection coordinate point A’ 1、B’ 1、C’ 1、D’ 1……O’ 1Along perpendicular to the upper side edge projection line direction projection in place
Upper side edge anchor point a is obtained on the upper side edge arc positioning strip of plane where the upper side edge arc positioning strip1、b1、
c1、d1……o1, by lower side projection coordinate point A’ 2、B’ 2、C’ 2、D’ 2……O’ 2Along perpendicular to the lower side projection line direction
Project to and lower side positioning is obtained on the lower side arc positioning strip of plane where the lower side arc positioning strip
Point a2、b2、c2、d2……o2, one piece and the width identical stripe board I according to steel box-girder interior plate to be processed are then obtained, will
The side side of stripe board I is corresponding with upper side edge anchor point to be welded on upper side edge arc positioning strip, by the stripe board I
Opposite side side it is corresponding with lower side anchor point be welded on lower side arc positioning strip, then respectively obtain one piece of sector ring board
I and one piece of sector ring board II, the internal diameter of the sector ring board I is equal to the radius of upper side edge projection line, internal diameter of the sector ring board II etc.
In the radius of lower side projection line, the width of the sector ring board I is equal to the width of steel box-girder top plate to be processed, the sector ring board II
Width be equal to the width of steel box-girder bottom plate to be processed, set up sector ring board I respectively at the two ends of the internal diameter of sector ring board I and install fixed
Site a‘ 1And o’ 1, sector ring board I is set up at the midpoint of the internal diameter of sector ring board I anchor point h is installed’ 1, in the internal diameter of sector ring board II
Two ends set up sector ring board I respectively anchor point a be installed‘ 2And o’ 2, the peace of sector ring board II is set up at the midpoint of the internal diameter of sector ring board II
Set site h’ 2, then the sector ring board I and the sector ring board II are respectively welded on the both sides side of the stripe board I,
When welding, sector ring board I installs anchor point a‘ 1、h’ 1、o’ 1With upper side edge anchor point a1、h1、o1Correspondence is in the stripe board I
On position welded, sector ring board II installs anchor point a‘ 2、h’ 2、o’ 2With upper side edge anchor point a2、h2、o2Correspondence is in the bar
Position on shape plate I is welded, and the stripe board II of one piece and the same widths of stripe board I is then obtained, by the stripe board II
Both sides side respectively with the sector ring board I and the external diameter arc-shaped side positioning welding of the sector ring board II, finally to each junction
Carry out full weld processing.
2. the processing method of rotation steel box-girder according to claim 1, it is characterised in that：In the sector ring board I and described
Sector ring board II is completed after positioning welding, along institute in the stripe board I between the sector ring board I and the sector ring board II
State the length direction uniform intervals of stripe board I set polylith reinforcing plate, reinforcing plate respectively with the stripe board I, the sector ring board I and
The sector ring board II is welded to connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610251208.XA CN105921625B (en) | 2016-04-21 | 2016-04-21 | Rotate the processing method of steel box-girder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610251208.XA CN105921625B (en) | 2016-04-21 | 2016-04-21 | Rotate the processing method of steel box-girder |
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| Publication Number | Publication Date |
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| CN105921625B true CN105921625B (en) | 2017-07-28 |
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Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5720136A (en) * | 1996-01-26 | 1998-02-24 | Turner; Scott Alan | Modular staircase |
| CN100351477C (en) * | 2005-04-08 | 2007-11-28 | 贵州大学 | Integrally assembling staircase and method for fabricating same |
| CA2708599C (en) * | 2007-12-09 | 2013-02-05 | Saferack, Llc | A gangway and method for manufacturing same |
| CN101524804B (en) * | 2009-03-27 | 2011-03-23 | 中建钢构有限公司 | Steel member manufacturing method |
| CN101642841A (en) * | 2009-08-25 | 2010-02-10 | 江苏沪宁钢机股份有限公司 | Manufacturing method of double-twist box-shaped bent member |
| CN101774109B (en) * | 2010-01-19 | 2011-12-28 | 江苏沪宁钢机股份有限公司 | Method for manufacturing double-spiral steel staircase without middle standing pillar |
| CN103056616B (en) * | 2012-12-26 | 2016-05-18 | 江苏沪宁钢机股份有限公司 | A kind of bending box component and manufacturing process thereof |
| CN103659182B (en) * | 2013-12-03 | 2015-09-23 | 中建钢构江苏有限公司 | The preparation method of bending box beam 360 ° of spiral stairses |
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