CN109930814A - Quick square tube, round tube double fastener scaffold - Google Patents
Quick square tube, round tube double fastener scaffold Download PDFInfo
- Publication number
- CN109930814A CN109930814A CN201910310213.7A CN201910310213A CN109930814A CN 109930814 A CN109930814 A CN 109930814A CN 201910310213 A CN201910310213 A CN 201910310213A CN 109930814 A CN109930814 A CN 109930814A
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- connector
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- square tube
- scaffold
- column
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Abstract
The invention belongs to Construction Formwork & Scaffold Technology fields, specifically disclose a kind of quick square tube, round tube double fastener scaffold, including column, horizon bar and connection component, connection component includes the first connector and the second connector, first connector is fixedly connected with column, and the first connector includes connector ontology and several fasteners, connector ontology axially through being provided with the centre bore passed through for column, several supporting blocks are distributed in the circumferentially-spaced of connector ontology, offer first through hole in supporting block；Second connector includes interconnecting piece and two clamping plates, and interconnecting piece is fixedly connected with horizon bar, and the second through-hole corresponding with first through hole is offered on two clamping plates.Connecting component structure in this programme is simple, and design rationally, is suitable for the variform steel pipes such as round tube or square tube, without more people's compounding practices, simple and effective is assembled and disassembled, it is time saving and energy saving, it can guarantee and be connected firmly between column and horizon bar, the scaffold stability thus put up is high, securely and reliably.
Description
Technical field
The invention belongs to Construction Formwork & Scaffold Technology field, a kind of quick square tube, round tube double fastener scaffold are specifically disclosed.
Background technique
Currently, people can build scaffold for worker's walking in high altitude operation on construction building site.Scaffold
It is to be connected with each other by more steel pipes by connection fastener, steel pipe is divided into column (upright bar), horizontal rod and vertical equity
Bar etc..What the steel pipe for building scaffold used is all round tube, main reason is that after round tube is convenient for tying up, and round tube is tied
Even if 360 ° of arbitrarily rotation, also uniform forces, the case where being not in loosening.Therefore connection fastener at present on the market is such as detained
Part formula, disk button, gate-type, bowl fastening type fastener etc., are all only applicable to tying up for round tube.
Due to the above reasons, all without building scaffold with square tube on current construction building site.Although cutting
In the case where face equal (weight is identical), the shaft center compression resistant ability of square tube and round tube is equal, but the bend resistance of square tube in fact
Property is better than round tube, that is to say, that square tube is higher than round tube bearing capacity in fact, and stability is stronger, and construction personnel steps down in square tube
On be not easy to step on cunning.
In addition, above-mentioned connection fastener there is problems when in use: 1, a connection fastener can only be by a water
Flat bar is overlapped on column.But since round tube bearing capacity is small, it is bad that column builds the too high scaffold stability that will cause, and is easy hair
Raw collapse accident.2, construction personnel using above-mentioned connection fastener come when building scaffold, since these connection fasteners are all logical
Bolt locking is crossed, the installation process between steel pipe and steel pipe is very troublesome, when the larger workload for the scaffold for needing to build,
It needs several construction personnel to cooperate simultaneously, and in high altitude operation, the installation and removal of bolt are inconvenient, needs to spend a large amount of
Time, often also have a screw or the phenomenon that nut is fallen, be easy to happen the risk of falling object from high altitude, safety coefficient is low.
Summary of the invention
The purpose of the present invention is providing a kind of quick square tube, round tube double fastener scaffold, to solve scaffold in the prior art
Connection fastener be not suitable for that square tube, structural-load-carrying capacity are bad, stability is not high, installation is time-consuming and laborious, safety is not high
Problem.
In order to achieve the above object, base case of the invention are as follows: a kind of quick square tube, round tube double fastener scaffold, including
Column, horizon bar and connection component, the connection component include the first connector and the second connector, the first connector and column
Be fixedly connected, the first connector includes connector ontology and several fasteners, connector ontology axially through be provided with can
For the centre bore that column passes through, supporting block identical with fastener quantity, supporting block is distributed in the circumferentially-spaced of connector ontology
On offer the first through hole being arranged in the same direction with the axial direction of centre bore；Second connector includes interconnecting piece and two folders
Plate, interconnecting piece are fixedly connected with horizon bar, and the second through-hole corresponding with first through hole is offered on two clamping plates.
The working principle of this base case is: before building scaffold, column being allowed to pass through the first connector first
Centre bore, and the first connector is welded on column, then the interconnecting piece of the second connector is welded together with horizon bar；
When building scaffold, two clamping plates of the second connector need to be only clipped in the supporting block of the first connector, be located at supporting block
Between two clamping plates, and make first through hole and the second through-hole alignment, fastener is then passed through into first through hole and the second through-hole, is made
First connector and the fixation of the second connector are locked together, and just column and horizon bar overlap, repeat aforesaid operations,
Scaffold can be put up；When dismantling scaffold, fastener need to be only removed, so that it may by the first connector and the second connector point
It opens, even if column and horizon bar separation, repeat aforesaid operations, so that it may which scaffold is dismantled.
Compared with prior art, the beneficial effect of this base case is:
1, the connecting component structure in this programme is simple, and design rationally, can cooperate at present common square tube or circle on the market
The variform steel pipe such as pipe uses, and first connector can arrange in pairs or groups simultaneously with multiple second connectors and use, i.e.,
Only more horizon bars can be connected on the sustained height position of column simultaneously with first connector, and can guarantee column
It is connected firmly between horizon bar, practical, low manufacture cost, reuse rate is high, has higher economic value.
2, before building scaffold, the first connector and the second connector are first respectively welded at column and horizon bar
On, when building scaffold, only the first connector and the second connector need to be fixed into locking with fastener, horizon bar can be pacified
On column, installation process is easy quickly, is not necessarily to more people's compounding practices, time saving and energy saving, installation speed is far faster than current market
On connection fastener, the project progress that scaffold is built can be greatly speeded up.
3, compared to round tube, square tube inconvenience is tied up, and connection is difficult, therefore at present on construction site without being taken using square tube
Scaffold is built, inventor develops the connecting component structure in this programme, solve company in the prior art by studying for a long period of time
Clasp is not suitable for the technical issues of square tube, solves square tube yet and is not suitable for the technical issues of building scaffold, therefore, this
The column and horizon bar of scaffold in scheme can increase original using square tube or round tube or square tube, round tube cross-reference
The range of choice of material；In addition, construction personnel's foot steps down on round tube, forced area is small, narrow, it is easy to cunning is stepped on, it is abnormally dangerous, but
Use square tube as the horizon bar of scaffold, when construction personnel is stepped down in square tube, foot steps on that area is big, wide, and the stability of people is high, is not easy
It skids, it is safer.
4, during building scaffold, the spacing between adjacent columns is that calculated in advance provides, but is building
During, due to difference etc. between ground out-of-flatness, each region of ground, column is it is possible that crooked phenomenon, thus
It is unstable to may result in scaffold, or even collapses.In the prior art, since steel pipe can slide in connection fastener, so nothing
Method solves the above problems；And in the present solution, due to horizon bar both ends be welded with the second connector, and the second connector with
First connector is locked together by fastener fixation, so column is held by horizon bar, can not run-off the straight, therefore, this
Scaffold in scheme is built into rear stability height, more securely and reliably.
Further, the fastener includes positioning pin, and positioning pin includes head and shank, and the width on the head of positioning pin is big
Several location holes have been evenly spaced on along its axial direction in the shank of the diameter of first through hole and the second through-hole, positioning pin.
In use, first positioning pin is inserted into first through hole and the second through-hole, since the width on the head of positioning pin is greater than
The head of the diameter of first through hole and the second through-hole, positioning pin will be stuck on fixture block, then according between two fixture blocks
Away from in the suitable location hole of pin shaft insertion, to the first connector and the second connector are fixed together, so that water
Flat bar is fitted together with column.
Further, the cross section and longitudinal section of the first through hole and the second through-hole are isosceles trapezoid, the positioning pin
Shank and the shape of the first through hole and the second through-hole match.First through hole and the second through-hole are in square cone, in gravity
Under the action of, in use, positioning pin can be inserted more and more tighter in first through hole and the second through-hole, determine to improve
The locking effect of position pin, and then the stable connection between the first connector and the second connector is improved, improve scaffold
Whole stability and safety；In disassembly, the lower part of positioning pin need to be only tapped, it can be convenient and efficient by taking out positioning pin.
Further, the interconnecting piece of second connector includes the grafting block in locating piece and pluggable horizon bar, positioning
Block is fixedly connected with horizon bar.In use, only grafting block need to be inserted into horizon bar, and make nozzle phase of the locating piece with horizon bar
It supports, then welds together locating piece and horizon bar, the second connector and horizon bar can be fitted together, installation process
It is simple and quick.
Further, the shape of the grafting block is rectangular, and the horizon bar is square tube.Second of scaffold in this programme
Connector can be used for installing square tube, using square tube as the horizon bar of scaffold, when construction personnel is stepped down on horizon bar, be not easy to beat
It is sliding, it is safer.
Further, the cross section of the centre bore is rectangular or round, opposite with centre bore of the cross section of the column
Match.Centre bore is round and square column type production easy to process, while square tube and round tube are steel pipe shapes common in building field,
Convenient for finding substitute.
Further, connecting rope is equipped between the positioning pin and the first connector.Connecting rope is by positioning pin and connector sheet
Body is fixed together, and can prevent positioning pin from losing, while positioning pin is fallen when avoidable high altitude operation, to below scaffold
Personnel threaten, improve safety.
Further, the supporting block and connector ontology integrally casting shaping, the clamping plate and interconnecting piece integrally casting at
Type, the head of the positioning pin and shank integrally casting shaping.First connector, the second connector and positioning pin are integrated casting
Molding structure is made, their overall structure stability can be made more preferable, bearing capacity is more preferable.
Further, the quantity of the supporting block on one connector ontology is one to four.On each connector ontology
One to four supporting block is set, is the type often used when building scaffold.
Further, the outer profile of the connector ontology is cylindrical or square column type.Cylindrical and square column type is Building wood
Generally used shape, applied widely in material, and produces convenient for batch micro operations.
Detailed description of the invention
Fig. 1 is the longitudinal sectional view when column of scaffold and horizon bar overlap in the embodiment of the present invention；
Fig. 2 is the top view of the first the first connector provided in the embodiment of the present invention；
Fig. 3 is the longitudinal sectional view of the first the first connector in the embodiment of the present invention；
Fig. 4 is the longitudinal sectional view of the second connector in the embodiment of the present invention；
Fig. 5 is the top view of second of first connectors provided in the embodiment of the present invention；
Fig. 6 is the top view of the third the first connector provided in the embodiment of the present invention；
Fig. 7 is the top view of the 4th kind of the first connector provided in the embodiment of the present invention；
Fig. 8 is the top view of the 5th kind of the first connector provided in the embodiment of the present invention；
Fig. 9 is the top view of the 6th kind of the first connector provided in the embodiment of the present invention.
Specific embodiment
It is further described below by specific embodiment:
Appended drawing reference in Figure of description include: column 1, horizon bar 2, the first connector 3, connector ontology 31, in
Heart hole 311, supporting block 32, first through hole 321, the second connector 4, grafting block 41, locating piece 42, clamping plate 43, the second through-hole
431, positioning pin 5, head 51, shank 52, location hole 53, connecting rope 54.
Embodiment is substantially as shown in Fig. 1, a kind of quick square tube, round tube double fastener scaffold, including column 1,2 and of horizon bar
Connection component, column 1 and horizon bar 2 can use round tube or square tube, and connection component includes the first connector 3 and the second connector
4。
In conjunction with shown in Fig. 2 and Fig. 3, the first first connector 3 provided in the present embodiment, including 31 He of connector ontology
Four fasteners, the outer profile of connector ontology 31 are cylinder, connector ontology 31 axially through being provided with for column 1
The centre bore 311 passed through, the cross section of centre bore 311 are circle, there are four the circumferential direction of connector ontology 31 is evenly spaced on
Supporting block 32, supporting block 32 and 31 integrally casting shaping of connector ontology；The axis with centre bore 311 is offered in supporting block 32
The first through hole 321 being arranged in the same direction to direction, the cross section and longitudinal section of first through hole 321 are isosceles trapezoid.
As shown in connection with fig. 4, the second connector 4 includes interconnecting piece and two clamping plates 43, offer on two clamping plates 43 with
Corresponding second through-hole 431 of first through hole 321, the cross section and longitudinal section of the second through-hole 431 are isosceles trapezoid；Interconnecting piece
Including the grafting block 41 in locating piece 42 and pluggable horizon bar 2, the locating piece 42 and grafting block 41 of two clamping plates 43, interconnecting piece
Integrally casting shaping, locating piece 42 and horizon bar 2 weld, the shape of grafting block 41 be it is rectangular, therefore, second connector 4 is suitable
For square-tube type horizon bar 2, using square tube as the horizon bar 2 of scaffold, when construction personnel is stepped down on horizon bar 2, it is not easy to skid,
It is safer.In addition to this, grafting block 41 can also be designed to circle, and therefore, this second connector 4 is suitable for tubular type water
Flat bar 2.
As shown in Figure 1, fastener includes positioning pin 5, positioning pin 5 includes head 51 and shank 52, the head 51 of positioning pin 5
With 52 integrally casting shaping of shank；The head 51 of positioning pin 5 is greater than the cross section of first through hole 321 and the second through-hole 431, positioning
The lower vertical of the shank 52 of pin 5 is set there are two location hole 53, the shank 52 and first through hole 321 and the second through-hole of positioning pin 5
431 shape matches；Connecting rope 54 is equipped between positioning pin 5 and the first connector 3, connecting rope 54 can use iron wire, Buddhist nun
The solid wear-resisting materials such as dragon rope are made, and connecting rope 54 links together positioning pin 5 and connector ontology 31, can prevent from positioning
Pin 5 is lost, while positioning pin 5 is fallen when avoidable high altitude operation, is threatened to the personnel below scaffold, and safety is improved
Property.
In addition to this, the present embodiment additionally provides the first connector 3 of following several structures:
As shown in connection with fig. 5, second of first connectors 3, the difference with the first the first connector 3 be, connector sheet
The outer profile of body 31 is square column type, the cross section of centre bore 311 be it is rectangular, therefore, second of first connectors 3 are suitable for square tube
Type column 1.
As shown in connection with fig. 6, the third first connector 3, the difference with the first the first connector 3 be, supporting block 32
Only one, the third first connector 3 is also applied for tubular type column 1 as the first connector.
As shown in connection with fig. 7, the 4th kind of first connector 3, the difference with the first the first connector 3 be, supporting block 32
There are two, and two supporting blocks 32 are located along the same line, the 4th kind of first connector 3 is also fitted as the first connector
For tubular type column 1.
As shown in connection with fig. 8, the 5th kind of first connector 3, the difference with the first the first connector 3 be, supporting block 32
There are two, and two supporting blocks 32 are mutually perpendicular to, the 4th kind of first connector 3 is also applied for justifying as the first connector
Cast column 1.
As shown in connection with fig. 9, the 6th kind of first connector 3, the difference with the first the first connector 3 be, supporting block 32
There are three, and be mutually perpendicular between adjacent supporting block 32, the 6th kind of first connector 3 is also fitted as the first connector
For tubular type column 1.
In addition, it is worth noting that, the structure of the first connector 3 is not limited only to several structures listed above, can be with
The supporting block 32 of connector in second is designed to one, two, three etc., it, can basis during scaffold lapping
Specific engineering structure and actual conditions, select different types of first connector 3 and the second connector 4 to be used cooperatively.
When building scaffold, column 1 is allowed to pass through the centre bore 311 of the first connector 3 first, and by the first connector 3
It is welded on column 1；Then the grafting block 41 of the second connector 4 is inserted into horizon bar 2, and makes locating piece 42 and horizon bar 2
Nozzle offset, then locating piece 42 and horizon bar 2 are welded together, the second connector 4 and horizon bar 2 can be assembled in
Together；Then two clamping plates 43 of the second connector 4 are clipped in the supporting block 32 of the first connector 3, are located at supporting block 32
Between two clamping plates 43, and it is directed at first through hole 321 and the second through-hole 431, last positioning pin 5 passes through 321 He of first through hole
Second through-hole 431, since the width on the head 51 of positioning pin 5 is greater than the diameter of first through hole 321 and the second through-hole 431, positioning
The head 51 of pin 5 will be stuck on fixture block, then according to the spacing between two fixture blocks, (on construction building site often with pin shaft
The spare and accessory parts used) it is inserted into suitable location hole 53, so that the first connector 3 and the fixation of the second connector 4 are locked at one
It rises, so that column 1 and horizon bar 2 overlap, to gradually put up scaffold.
It is worth noting that the size of centre bore 311 and locating piece 42 in the present embodiment is and square tube/round tube size
Adaptable, specifically, the cross sectional dimensions specification of square tube mainly has 25mm*25mm, 40mm*40mm, 60mm*60mm, 80mm*
80mm, 100mm*100mm, 125mm*125mm, 150mm*150mm, 200mm*200mm, 400mm*400mm, the cross section of round tube
Diameter dimension specification mainly have 25mm, 40mm, 60mm, 80mm, 100mm, 125mm, 150mm, 200mm, 400mm, certainly,
It, can be according to the specification of actual use demand designed, designed square tube and round tube in Practical Project.
Connecting component structure in this programme is simple, and design is rationally, practical, can cooperate at present common side on the market
Pipe or the variform steel pipe such as round tube use, and solve connection fastener in the prior art and are not suitable for the technology of square tube and ask
Topic, increases the range of choice of raw material, and using square tube as the horizon bar 2 of scaffold, when construction personnel steps down in horizon bar 2,
Foot forced area is big, is not easy to skid, safer.
In the present solution, first connector 3 can arrange in pairs or groups simultaneously with multiple second connectors 4 and use, i.e., only with one
More horizon bars 2 can be connected on the sustained height position of column 1 by the first connector 3 simultaneously, and can guarantee column 1 and water
It is connected firmly between flat bar 2, and due to the limitation of the first connector 3, the second connector 4 and horizon bar 2, column 1 can not occur
Inclination, therefore the scaffold stability put up is high, is not easy to collapse, more secure and reliable；Meanwhile more people are not necessarily to when scaffold lapping
The installation process of compounding practice, the first connection component and the second connection component is easy, and time saving and energy saving, installation speed is far faster than current
Connection fastener on the market, connection fastener on the market will spend 20~30 minutes time in assembly and disassembly, the company in this programme
Connected components only need 2~3 minutes, can greatly speed up the project progress that scaffold is built；In addition, connection component low manufacture cost, weight
Multiple utilization rate is high, has higher economic value, is suitable for large-scale promotion and uses.
What has been described above is only an embodiment of the present invention, and the common sense such as well known specific structure and characteristic are not made herein in scheme
Excessive description.It, without departing from the structure of the invention, can be with it should be pointed out that for those skilled in the art
Several modifications and improvements are made, these also should be considered as protection scope of the present invention, these all will not influence what the present invention was implemented
Effect and patent practicability.
Claims (10)
1. quick square tube, round tube double fastener scaffold, it is characterised in that: including column, horizon bar and connection component, the connection group
Part includes the first connector and the second connector, and the first connector is fixedly connected with column, and the first connector includes connector sheet
Body and several fasteners, connector ontology axially through being provided with the centre bore passed through for column, connector ontology
It is circumferentially-spaced that supporting block identical with fastener quantity is distributed with, it is offered in supporting block in the same direction with the axial direction of centre bore
The first through hole of setting；Second connector includes interconnecting piece and two clamping plates, and interconnecting piece is fixedly connected with horizon bar, two clamping plates
On offer the second through-hole corresponding with first through hole.
2. quick square tube according to claim 1, round tube double fastener scaffold, it is characterised in that: the fastener includes fixed
Position pin, positioning pin include head and shank, and the head of positioning pin is greater than first through hole and the second through-hole, and the shank of positioning pin is along it
Axial direction has been evenly spaced on several location holes.
3. quick square tube according to claim 2, round tube double fastener scaffold, it is characterised in that: the first through hole and
The cross section and longitudinal section of two through-holes are isosceles trapezoid, the shank of the positioning pin and the first through hole and the second through-hole
Shape matches.
4. quick square tube according to claim 1, round tube double fastener scaffold, it is characterised in that: second connector
Interconnecting piece includes the grafting block in locating piece and pluggable horizon bar, and locating piece is fixedly connected with horizon bar.
5. quick square tube according to claim 4, round tube double fastener scaffold, it is characterised in that: the shape of the grafting block
To be rectangular, the horizon bar is square tube.
6. quick square tube according to claim 1-5, round tube double fastener scaffold, it is characterised in that: the center
The cross section in hole be it is rectangular or round, cross section and the centre bore of the column match.
7. quick square tube according to claim 6, round tube double fastener scaffold, it is characterised in that: the positioning pin and first
Connecting rope is equipped between connector.
8. quick square tube according to claim 7, round tube double fastener scaffold, it is characterised in that: the supporting block with connect
Clamping plate described in part ontology integrally casting shaping and interconnecting piece integrally casting shaping, the head of the positioning pin and shank integrally casting
Molding.
9. quick square tube according to claim 8, round tube double fastener scaffold, it is characterised in that: one connector sheet
The quantity of supporting block on body is one to four.
10. quick square tube according to claim 9, round tube double fastener scaffold, it is characterised in that: the connector ontology
Outer profile is cylindrical or square column type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910310213.7A CN109930814A (en) | 2019-04-17 | 2019-04-17 | Quick square tube, round tube double fastener scaffold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910310213.7A CN109930814A (en) | 2019-04-17 | 2019-04-17 | Quick square tube, round tube double fastener scaffold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109930814A true CN109930814A (en) | 2019-06-25 |
Family
ID=66990305
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910310213.7A Pending CN109930814A (en) | 2019-04-17 | 2019-04-17 | Quick square tube, round tube double fastener scaffold |
Country Status (1)
| Country | Link |
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| CN (1) | CN109930814A (en) |
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| CN203729576U (en) * | 2013-12-13 | 2014-07-23 | 朱畅艺 | Ringlock type steel tube scaffold |
| CN205171985U (en) * | 2015-12-10 | 2016-04-20 | 山东拉立克建材科技有限公司 | High torsional stiffness dish knot formula steel pipe support node |
| CN106401166A (en) * | 2016-11-21 | 2017-02-15 | 福州大学 | Rapid scaffold connecting device and construction method thereof |
| CN207048280U (en) * | 2017-07-19 | 2018-02-27 | 鸿顺达控股有限公司 | One kind dismantles simple building scaffold |
| CN207727961U (en) * | 2017-10-17 | 2018-08-14 | 严晓安 | A kind of rotary connector for building scaffold and frame |
| CN109469314A (en) * | 2018-12-12 | 2019-03-15 | 严晓安 | A kind of square tube scaffold connector and square tube scaffold |
| CN210105280U (en) * | 2019-04-17 | 2020-02-21 | 严晓安 | Quick square tube and round tube double-clamp scaffold |
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2019
- 2019-04-17 CN CN201910310213.7A patent/CN109930814A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102444272A (en) * | 2011-10-17 | 2012-05-09 | 无锡速捷脚手架工程有限公司 | Connecting piece for scaffold cross rod |
| CN103362298A (en) * | 2013-08-01 | 2013-10-23 | 南通亨特管业有限公司 | Mobile tower scaffold with circular disc connecting device |
| CN203729576U (en) * | 2013-12-13 | 2014-07-23 | 朱畅艺 | Ringlock type steel tube scaffold |
| CN205171985U (en) * | 2015-12-10 | 2016-04-20 | 山东拉立克建材科技有限公司 | High torsional stiffness dish knot formula steel pipe support node |
| CN106401166A (en) * | 2016-11-21 | 2017-02-15 | 福州大学 | Rapid scaffold connecting device and construction method thereof |
| CN207048280U (en) * | 2017-07-19 | 2018-02-27 | 鸿顺达控股有限公司 | One kind dismantles simple building scaffold |
| CN207727961U (en) * | 2017-10-17 | 2018-08-14 | 严晓安 | A kind of rotary connector for building scaffold and frame |
| CN109469314A (en) * | 2018-12-12 | 2019-03-15 | 严晓安 | A kind of square tube scaffold connector and square tube scaffold |
| CN210105280U (en) * | 2019-04-17 | 2020-02-21 | 严晓安 | Quick square tube and round tube double-clamp scaffold |
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