CN106271409B - A kind of production method around cylinder steel ladder - Google Patents
A kind of production method around cylinder steel ladder Download PDFInfo
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- CN106271409B CN106271409B CN201610691494.1A CN201610691494A CN106271409B CN 106271409 B CN106271409 B CN 106271409B CN 201610691494 A CN201610691494 A CN 201610691494A CN 106271409 B CN106271409 B CN 106271409B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
Abstract
The present invention relates to structure steel fabrication fields, provide a kind of production method around cylinder steel ladder, are made around cylinder steel ladder using the production method around cylinder steel ladder, can preferably ensure the precision around cylinder steel ladder, reduce the working at height time, improve safety coefficient；The method for carrying out interruption cutting and whole plate curling with the evolute for marking terraced beam on whole plank is taken, bench is assembled on ground by real sample ruler cun, and installation is marked time and guardrail as needed；Step plate is installed in superposition support plate by group from upper layer toward lower layer on ground, the method that one layer of cutting of installation detaches one layer is made.
Description
Technical field
The present invention relates to structure steel fabrication fields, a kind of production method around cylinder steel ladder are provided, using this around cylindrical steel
The production method of ladder makes around cylinder steel ladder, can preferably ensure the precision around cylinder steel ladder, reduces the working at height time, carries
High safety factor.
Background technology
In structure steel fabrication, the spiral stairs around cylinder are frequently encountered（It can be referred to as around cylinder steel ladder）System
Make.It is shown in Figure 1, around cylinder steel ladder 1 by radius for the cylinder 2 of R based on, be connected in 2 lateral surface of cylinder, helically
Formula rises.It is this around cylinder steel ladder 1 include positioned at both sides helically formula rise inner support plate 3 and external support board 4, be connected in
Step plate 5 between 4 two support plates of inner support plate 3 and external support board, is arranged the guardrail on support plate 3,4（In figure not
It shows）, more to be additionally provided with platform when being spaced certain altitude around cylinder steel ladder（It is not shown in figure）.It support plate 3,4 and steps on
The material that is made of step plate 5 is steel plate.In the case of not considering plate thickness, between inner support plate 3 and the lateral surface of cylinder 2
With a distance a, b, the i.e. width of step plate 5 are divided between inner support plate 3 and external support board 4.Two pieces of adjacent step plates
In projection on cylinder axis section, adjacent sideline overlaps.Whole ladder complex manufacturing technology, manufacture difficulty is larger, accuracy
It is often difficult to reach requirement.
In the prior art, the making and installation of step plate, guardrail and platform, technique are more mature.
Around holder of the support plate as the steel ladder of cylinder steel ladder, plays the role of support for the steel ladder, make essence
Degree will directly affect the accuracy of manufacture of whole ladder.
In the prior art, the technique that the making of support plate relatively mostly uses is：Polylith is cut by monoblock steel plate and meets width
It is required that veneer, polylith veneer is molded through roll bending, the welded support plate that is spliced of the molding veneer of polylith.This manufacturing process
When roll bending operation is embodied, since veneer is not the same in the angle of veneer reeling machine upper feeding, curvature, the spiral of finished product veneer
Lift angle consistency is poor.And curvature, the helix angle of finished product veneer are the principal element for influencing support plate and making precision, Jin Erying
Ring the accuracy of manufacture of whole ladder.
In addition, when whole ladder makes, the working at height time is longer, and safety coefficient is relatively low.
Invention content
The object of the present invention is to provide a kind of production methods around cylinder steel ladder, use the production method around cylinder steel ladder
It makes around cylinder steel ladder, can preferably ensure the precision around cylinder steel ladder, reduce the working at height time, improve safety coefficient.
The purpose of the present invention is be achieved through the following technical solutions：
A kind of production method around cylinder steel ladder, characterized in that include the following steps：
Support plate makes, including following process：
A. at least two plates for meeting design requirement are kept flat, is respectively used to make inner support plate and external support board；
B. the plank side of looking for：Make effective usable floor area that shape on plank is rectangle to maximum；After rectangle when the side of looking for is used as
The continuous benchmark in relation to process；
C. support plate line：On the basis of rectangle, on the plank for making inner support plate since the lower left corner number line,
Horizontal direction marks a plurality of horizontal line using the distance in the expanded view between adjacent two pieces of step plates by design requirement as spacing, with design
The a length of spacing of the inside arc of step plate makes a plurality of ordinate in it is required that, by lower left, be linked in sequence first article of horizontal line and
The crosspoint of one ordinate, Article 2 horizontal line intersect with the crosspoint of Article 2 ordinate, Article 3 horizontal line with Article 3 ordinate
Crosspoint to the upper right side of plank of point, nth bar horizontal line and nth bar ordinate（N is positive integer）, first oblique line is formed, with same
The method of sample is made above first oblique line with lower section and the parallel lines parallel with first oblique line；For making outer branch
Number line, horizontal direction press design requirement in the expanded view between adjacent two pieces of step plates since the lower left corner on the plank of fagging
Distance is that spacing marks a plurality of horizontal line, a plurality of ordinate is made with a length of spacing of the lateral arcs of step plate in design requirement, by lower-left
Side starts, the crosspoint of crosspoint, Article 2 horizontal line and the Article 2 ordinate of be linked in sequence first horizontal line and first ordinate,
Article 3 horizontal line and the crosspoint of Article 3 ordinate, crosspoint to the upper right side of plank of m articles of horizontal line and the m articles ordinate, shape
At first oblique line, made above first oblique line with lower section with same method and parallel with first oblique line parallel
Line（M is positive integer）；
D. plate cutting：Inclined plate item between every two oblique line can form one section of veneer, interruption cutting be carried out along oblique line, along one
When oblique line is cut, starting position stays 80-100mm not cut, after stay 80-100mm not cut by every cutting 600-800mm between
Disconnected cutting method is cut；
E. it draws a design punching：After terminating cutting and elimination residue, the horizontal line on veneer is stamped into sample punching；
F. plank crimps：On the basis of rectangle, horizontal line is equal to the inside arc of step plate in design requirement between two oblique lines
Long plank is crimped in veneer reeling machine, and direction of feed is the longitudinal direction of rectangle, the curvature and design requirement of the plank after curling
After the curvature for the pitch circle that middle inner support plate projects on cylinder axis section is identically formed interior superposition support plate, taking-up, which is stood up, to be waited for
With；Horizontal line is crimped equal to the plank of the outside arc length of step plate in design requirement in veneer reeling machine between two oblique lines, into
To the longitudinal direction that direction is rectangle, external support board projects on cylinder axis section in the curvature and design requirement of the plank after curling
Pitch circle curvature be identically formed outer superposition support plate after, taking-up stands up for use；
Step plate makes：By design requirement to monolithic step plate into line number line, cutting, reinforcement, welding, after leveling scarfing cinder beat
It grinds spare；
Platform makes：Monolithic platform is cut, reinforcement into line number line by design requirement, welding, scarfing cinder polishing is standby after leveling
With；
Guards making：By design requirement, sectional making guardrail is spare；
Assembled, welding：On platform for making, marked by real sample on the pitch circle that inner support plate projects on cylinder axis section
Inner circle camber line, arc length be equal to make inner support plate plank transverse direction effective length；External support board is marked in cylinder by real sample
Outer circle camber line on the pitch circle projected on shaft section, arc length are equal to the plank transverse direction effective length for making external support board；Make to be located at
The line at midpoint of inner circle camber line and outer circle camber line on the same shaft section of cylinder intersects with the axis of cylinder, marks respectively
The midpoint of inner circle camber line and outer circle camber line；Interior superposition support plate and outer superposition support plate are stood up respectively in corresponding Inner arc
Line and outer circle camber line make interior superposition support plate and the arcuate midway point of outer superposition support plate correspond respectively to above-mentioned marked inner circle
The midpoint of camber line and outer circle camber line；The lower end of interior superposition support plate and outer superposition support plate is temporarily solid with platform for making respectively
Even, temporary support is arranged in the inside setting temporary support for being superimposed support plate inside, the outside for being superimposed support plate outside；From top layer
Start the embedded step plate first between of veneer, make the inner arc of step plate be aligned in horizontal line in veneer, make to mark time
Outer arc is directed at the horizontal line in outer veneer, keeps plate level of marking time, welding step plate and interior veneer, outer veneer；First pair
It is reliable to lift after interior veneer, outer veneer and step plate assembly, welding, it cuts reserved place open and preliminarily forms bench, it should under moving
Bench；According to above-mentioned work flow until forming final stage bench；
Guardrail, platform are installed：As needed, corresponding guardrail, platform are installed in bench；
Whole ladder assembling：It is guidance with design requirement, based on cylinder, each bench is from bottom to top assembled, it is right
Whole ladder is formed after reliably being welded between adjacent bench.
The beneficial effects of the invention are as follows：
The above-mentioned production method around cylinder steel ladder, takes with the evolute for marking interior external support board on whole plank, into
Row whole plate crimps and the method for interruption cutting, the consistency of interior external support board are preferable；When making bench, from upper on platform for making
Layer is made toward lower layer by the method for cutting one section of bench of separation after one section of bench assembling of group pair, by real sample ruler cun in ground group
It fills bench and step plate and guardrail is installed as needed, ensure the precision of bench, reduce the working at height time, improve safety system
Number；When whole ladder assembling, based on cylinder, by real sample in the axial setting-out of whole ladder, is from bottom to top assembled, ensure each bench
Axial line and cylinder axis the depth of parallelism, and then ensure the precision of whole ladder.
Two pieces can be at least installed as the effective length to further improved technical scheme of the present invention, every section of veneer to mark time
Plate.
This improvement reduces the connector of bench, is beneficial to ensure the precision of whole ladder.
As to further improved technical scheme of the present invention, when support plate line, in the plate for making inner support plate
The corresponding position for drawing installation step plate on plank on material and for making external support board.
This improvement, i.e., the interior interior veneer being superimposed in support plate and the outer outer veneer being superimposed in support plate are corresponded, are carried
The utilization rate of high material.
As to further improved technical scheme of the present invention, when whole ladder assembling, according to bench by growing and short sequence assembles.
This improvement reduces the assembly difficulty caused by lifting bench, to bench positioning, improves the assembly technology of whole ladder
Property.
Description of the drawings
Fig. 1 is the perspective view on the shaft section of cylinder around cylinder steel ladder
Fig. 2 is the schematic diagram of inner support plate line
Specific implementation mode
Below in conjunction with the accompanying drawings, the invention will be further described：
Shown in Fig. 1, Fig. 2, this production method around cylinder steel ladder 1 includes the following steps：
Support plate makes, including following process：
A. at least two plates for meeting design requirement are kept flat, is respectively used to make inner support plate 3 and external support board 4.
It is of same size due to inner support plate 3 and external support board 4, but external support board 4 is superimposed the length of the technique of painting and is more than the superposition of inner support plate 3
The length of the technique of painting, therefore, the effective length for making external support board plank should be greater than for making the effective of inner support plate plank 6
The effective width of length, two kinds of planks is identical.
B. the plank side of looking for：Make effective usable floor area that shape on plank is rectangle to maximum；After rectangle 7 when the side of looking for is used as
The continuous benchmark in relation to process.The machine equipment that the process uses is ruler.
C. support plate line：On the basis of rectangle 7, on the plank 6 for making inner support plate since the lower left corner number
Line, horizontal direction mark a plurality of horizontal line 8 using the distance in the expanded view between adjacent two pieces of step plates 5 by design requirement as spacing,
Make a plurality of ordinate 9 with a length of spacing of the inside arc of step plate in design requirement 5, by lower left, be linked in sequence first
The crosspoint of horizontal line and first ordinate, Article 2 horizontal line and crosspoint, Article 3 horizontal line and the Article 3 of Article 2 ordinate are vertical
The crosspoint of line, crosspoint to the upper right side of plank of nth bar horizontal line and nth bar ordinate（N is positive integer）, form first tiltedly
Line 10, is made above first oblique line with same method with lower section and the parallel lines parallel with first oblique line；With
In number line, horizontal direction press design requirement between adjacent two pieces of step plates since the lower left corner on the plank for making external support board
Distance in expanded view is that spacing marks a plurality of horizontal line, is made with a length of spacing of the lateral arcs of step plate in design requirement a plurality of vertical
Line, by lower left, crosspoint, Article 2 horizontal line and the Article 2 ordinate of be linked in sequence first horizontal line and first ordinate
Crosspoint, the crosspoint of Article 3 horizontal line and Article 3 ordinate, m articles of horizontal line and the m articles ordinate crosspoint to plank
Upper right side forms first oblique line, made positioned at first oblique line above with same method and lower section and with first oblique line
Parallel parallel lines（M is positive integer）.
Obviously, the spacing of horizontal line is unfolded for step plate interval height, and step plate is horizontally disposed, the spacing phase at step plate both ends
Deng the spacing for making the horizontal line on the plank of inner support plate and the spacing for making the horizontal line on the plank of external support board
It is equal.The spacing of ordinate is that the step plate arc length of corresponding side is unfolded, specially：Plank for making inner support plate
The spacing of ordinate 9 on 6 is unfolded for 5 inner circle arc length of step plate, the spacing for making the horizontal line on the plank of external support board
It is unfolded for step plate outer circle arc length.
D. plate cutting：Inclined plate item between every two oblique line can form veneer 11 or outer veneer in one section, along oblique line into the ranks
Disconnected cutting, when being cut along an oblique line, starting position stays 80-100mm not cut, after by every cutting 600-800mm stay 80-
The interruption cutting method that 100mm is not cut is cut.In this example, choose：When being cut along an oblique line, starting position is stayed
90mm is not cut, after cut by every cutting 700mm interruption cutting methods for staying 90mm not cut.
To reduce the connector of bench, ensure the precision of whole ladder, it is also contemplated that the utilization rate of material, when cutting, every section of veneer
11 effective length can at least install two pieces of step plates 5.In diagram, respectively give up in the plank upper left corner 12 and the lower right corner 13 a pair of single
Plate.
After cutting after, only include interior veneer 11, outer veneer plank formed interior superposition support plate 14, outer superposition support
Plate.
It is right on the plank for making on the plank 6 of inner support plate and for making external support board when support plate line
The position of installation step plate 5, i.e., the interior veneer 11 in interior superposition support plate 14 and the outer outer veneer being superimposed in support plate should be drawn
It corresponds, the utilization rate of material can be improved.Based on above-mentioned, m=n, it is illustrated that in, m=n=11.The machine equipment that the process uses is
Ruler.
Stiffener plate is played the role of in the reserved part that do not cut, and ensures when follow-up plank crimps operation, between each veneer
There are enough bonding strengths.
The process uses gas cutting.
E. it draws a design punching：After terminating cutting, cleaning residue, the horizontal line on veneer is stamped into sample punching.Sample punching is bench group
Benchmark when dress for installing step plate.
F. plank crimps：The process crimps plank using three rolls plate bending machine.It is horizontal between two oblique lines on the basis of rectangle
The plank that line is equal to the inside arc length of step plate in design requirement is crimped in veneer reeling machine, and direction of feed is the vertical of rectangle
To upper roller when, curling drafts it is first small after gradually plus, inner support plate is in cylinder in the curvature and design requirement of the plank after curling
After the curvature of the pitch circle projected on body shaft section is identically formed interior superposition support plate, taking-up stands up for use；It is horizontal between two oblique lines
The plank that line is equal to the outside arc length of step plate in design requirement is crimped in veneer reeling machine, and direction of feed is the vertical of rectangle
To upper roller when, curling drafts it is first small after gradually plus, external support board is in cylinder in the curvature and design requirement of the plank after curling
After the curvature of the pitch circle projected on body shaft section is identically formed outer superposition support plate, taking-up stands up for use.In the process, to ensure
The direction of feed of plank can be used pattern and be assisted.The structure and application method of pattern are the prior art, this is not repeated.
Step plate makes：Step plate manufacture craft is the prior art, therefore is sketched：Monolithic step plate is carried out by design requirement
Number line, cutting, reinforcement, welding, scarfing cinder polishing is spare after leveling.
Platform makes：Monolithic platform is cut, reinforcement into line number line by design requirement, welding, scarfing cinder polishing is standby after leveling
With.
Guards making：By design requirement, sectional making guardrail is spare.The manufacture craft of each section guard is the prior art, this
It does not repeat.
Assembled, welding：On platform for making, marked by real sample on the pitch circle that inner support plate projects on cylinder axis section
Inner circle camber line 15, arc length be equal to make inner support plate plank transverse direction effective length；External support board is marked in cylinder by real sample
Outer circle camber line 16 on the pitch circle projected on body shaft section, arc length are equal to the plank transverse direction effective length for making external support board；Make
The axis of the line and cylinder 2 at the midpoint 17,18 of inner circle camber line 15 and outer circle camber line 16 on the same shaft section of cylinder
Line intersects, and marks the midpoint 17,18 of inner circle camber line and outer circle camber line respectively.Above-mentioned work step it is intended that inner circle camber line 15 and outer
Circular arc line 16 is symmetrical about the radial line of cylinder 2, and baseline is provided for follow-up work step, process.
Known to aforementioned：
The spacing of ordinate is the step plate circular arc length of run of corresponding side.
L1=（2R+2a）*π/x
L2=（2R+2a+2b）*π/x
Wherein：
L1：The spacing of step plate inner circle arc length expansion=for making horizontal line on the plank of inner support plate
L2：The spacing of step plate outer circle arc length expansion=for making horizontal line on the plank of external support board
R：The radius of cylinder
a：Inner support plate between the lateral surface of cylinder at a distance from
b：The interval of inner support plate and external support board
x：Each round design isodisperse
Interior superposition support plate and outer superposition support plate are stood up respectively in corresponding inner circle camber line and outer circle camber line, made interior
The arcuate midway point of superposition support plate and outer superposition support plate corresponds respectively to above-mentioned marked inner circle camber line and outer circle camber line
Midpoint；The lower end of interior superposition support plate and outer superposition support plate is connected with platform for making temporarily respectively, is superimposed support plate inside
Inside setting temporary support, outside superposition support plate outside be arranged temporary support；In first pair of veneer since top layer
Between embedded step plate, make the inner arc of step plate be aligned in horizontal line in veneer, keep the outer arc marked time alignment outer single
Horizontal line in plate keeps plate level of marking time, welding step plate and interior veneer, outer veneer；It veneer, outer veneer and is stepped in first pair
It is reliable to lift after walking plate assembly, welding, it cuts reserved place open and preliminarily forms bench, the bench under moving；According to above-mentioned operation
Flow is until form final stage bench；
Guardrail, platform are installed：As needed, corresponding guardrail, platform are installed in bench；
Whole ladder assembling：It is guidance with design requirement, based on cylinder, each bench is from bottom to top assembled, it is right
Whole ladder is formed after reliably being welded between adjacent bench.
The beneficial effects of the invention are as follows：
The above-mentioned production method around cylinder steel ladder, takes with the evolute for marking interior external support board on whole plank, into
Row whole plate crimps and the method for interruption cutting, the consistency of interior external support board are preferable；When making bench, from upper on platform for making
Layer is made toward lower layer by the method for cutting one section of bench of separation after one section of bench assembling of group pair, by real sample ruler cun in ground group
It fills bench and step plate and guardrail is installed as needed, reduce the working at height time, improve safety coefficient；When whole ladder assembling, with
Based on cylinder, by real sample in the axial setting-out of whole ladder, according to bench by grow and it is short, from bottom to top assembled, ensure each bench
Axial line and cylinder axis the depth of parallelism, reduce the connector of bench, and then ensure the precision of whole ladder.
Interior veneer in interior superposition support plate is corresponded with the outer outer veneer being superimposed in support plate, improves the utilization of material
Rate.
Claims (4)
1. a kind of production method around cylinder steel ladder, characterized in that include the following steps：
Support plate makes, including following process：
A. at least two plates for meeting design requirement are kept flat, is respectively used to make inner support plate and external support board；
B. the plank side of looking for：Make effective usable floor area that shape on plank is rectangle to maximum；The rectangle when side of looking for, which is used as, subsequently to be had
Close the benchmark of process；
C. support plate line：On the basis of rectangle, on the plank for making inner support plate since the lower left corner number line, it is horizontal
A plurality of horizontal line is marked in direction using the distance in the expanded view between adjacent two pieces of step plates by design requirement as spacing, with design requirement
The a length of spacing of inside arc of middle step plate makes a plurality of ordinate, by lower left, be linked in sequence first horizontal line and first
The crosspoint of ordinate, the crosspoint of Article 2 horizontal line and Article 2 ordinate, the crosspoint of Article 3 horizontal line and Article 3 ordinate, the
Crosspoint to the upper right side of plank of n horizontal line and nth bar ordinate（N is positive integer）, first oblique line is formed, with same side
Method is made above first oblique line with lower section and the parallel lines parallel with first oblique line；For making external support board
Number line, horizontal direction are with the distance in the expanded view between adjacent two pieces of step plates by design requirement since the lower left corner on plank
Spacing marks a plurality of horizontal line, and a plurality of ordinate is made with a length of spacing of the lateral arcs of step plate in design requirement, by lower left,
Be linked in sequence the crosspoint with Article 2 ordinate of crosspoint, Article 2 horizontal line of first horizontal line and first ordinate, Article 3
Horizontal line and the crosspoint of Article 3 ordinate, crosspoint to the upper right side of plank of m articles of horizontal line and the m articles ordinate, form first
Oblique line, is made above first oblique line with same method with lower section and the parallel lines parallel with first oblique line（M is
Positive integer）；
D. plate cutting：Inclined plate item between every two oblique line can form one section of veneer, and interruption cutting is carried out along oblique line, along an oblique line
When cutting, starting position 80-100mm is stayed not cut, after cut by every cutting 600-800mm interruptions for staying 80-100mm not cut
Segmentation method is cut；
E. it draws a design punching：After terminating cutting and elimination residue, the horizontal line on veneer is stamped into sample punching；
F. plank crimps：On the basis of rectangle, horizontal line is equal to the inside arc length of step plate in design requirement between two oblique lines
Plank is crimped in veneer reeling machine, and direction of feed is the longitudinal direction of rectangle, in the curvature and design requirement of the plank after curling in
After the curvature for the pitch circle that support plate projects on cylinder axis section is identically formed interior superposition support plate, taking-up stands up for use；It is right
Horizontal line is crimped equal to the plank of the outside arc length of step plate in design requirement in veneer reeling machine between two oblique lines, direction of feed
For the longitudinal direction of rectangle, external support board projects on cylinder axis section in the curvature and design requirement of the plank after curling pitch circle
Curvature be identically formed outer superposition support plate after, taking-up stands up for use；
Step plate makes：Monolithic step plate is cut, reinforcement into line number line by design requirement, welding, scarfing cinder polishing is standby after leveling
With；
Platform makes：Monolithic platform is cut, reinforcement into line number line by design requirement, welding, scarfing cinder polishing is spare after leveling；
Guards making：By design requirement, sectional making guardrail is spare；
Assembled, welding：On platform for making, marked on the pitch circle that inner support plate projects on cylinder axis section by real sample
Circular arc line, arc length are equal to the plank transverse direction effective length for making inner support plate；External support board is marked by real sample to cut in cylinder axis
Outer circle camber line on the pitch circle projected on face, arc length are equal to the plank transverse direction effective length for making external support board；Make to be located at cylinder
The line at midpoint of inner circle camber line and outer circle camber line on the same shaft section of body intersects with the axis of cylinder, marks inner circle respectively
The midpoint of camber line and outer circle camber line；Interior superposition support plate and outer superposition support plate are stood up respectively in corresponding inner circle camber line and
Outer circle camber line makes interior superposition support plate and the arcuate midway point of outer superposition support plate correspond respectively to above-mentioned marked inner circle camber line
With the midpoint of outer circle camber line；The lower end of interior superposition support plate and outer superposition support plate is connected with platform for making temporarily respectively,
The inside setting temporary support of interior superposition support plate, temporary support is arranged in the outside of superposition support plate outside；Since top layer
The embedded step plate first between of veneer, makes the inner arc of step plate be directed at the horizontal line in interior veneer, makes the outside marked time
Circular arc is directed at the horizontal line in outer veneer, keeps plate level of marking time, welding step plate and interior veneer, outer veneer；It is single in first pair
It is reliable to lift after plate, outer veneer and step plate assembly, welding, it cuts reserved place open and preliminarily forms bench, the ladder under moving
Section；According to above-mentioned work flow until forming final stage bench；
Guardrail, platform are installed：As needed, corresponding guardrail, platform are installed in bench；
Whole ladder assembling：It is guidance with design requirement, based on cylinder, each bench is from bottom to top assembled, to adjacent
Bench between reliably weld after form whole ladder.
2. the production method according to claim 1 around cylinder steel ladder, characterized in that the effective length of every section of veneer is at least
Two pieces of step plates can be installed.
3. the production method according to claim 1 around cylinder steel ladder, characterized in that when support plate line, for making
Make on the plank of inner support plate and the plank for making external support board on the corresponding position for drawing installation step plate.
4. the production method according to claim 1 around cylinder steel ladder, characterized in that when whole ladder assembling, according to bench by growing
And short sequence assembling.
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| CN109403563A (en) * | 2018-11-19 | 2019-03-01 | 北京市机械施工有限公司 | A kind of interior super large list ladder girder cantilever formula rotation steel stair and preparation method thereof |
| CN109623271B (en) * | 2018-12-13 | 2021-10-01 | 山东鑫海矿业技术装备股份有限公司 | Manufacturing method of steel ladder |
| CN113275664B (en) * | 2021-05-27 | 2022-07-15 | 广船国际有限公司 | Panel processing method |
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| EP2378025A1 (en) * | 2010-04-15 | 2011-10-19 | Chridami Medias | Collapsible spiral staircase |
| CN103628639A (en) * | 2012-08-30 | 2014-03-12 | 宁波市镇海捷登应用技术研究所 | Spiral steel frame staircase and manufacturing method thereof |
| CN102817447A (en) * | 2012-08-31 | 2012-12-12 | 武汉一冶钢结构有限责任公司 | Method of manufacturing spiral staircase |
| CN105804340A (en) * | 2016-04-18 | 2016-07-27 | 深圳瑞和建筑装饰股份有限公司 | Spiral stair and building method thereof |
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