CN109707149A - Scaffold and its building method - Google Patents
Scaffold and its building method Download PDFInfo
- Publication number
- CN109707149A CN109707149A CN201910082540.1A CN201910082540A CN109707149A CN 109707149 A CN109707149 A CN 109707149A CN 201910082540 A CN201910082540 A CN 201910082540A CN 109707149 A CN109707149 A CN 109707149A
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- wall
- connecting rod
- upright bar
- wall connecting
- kelly
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Abstract
The present invention relates to a kind of scaffold and its building methods, including being embedded in the intracorporal wall-connecting piece of wall, crossbeam and upright bar, wall-connecting piece includes being embedded in the intracorporal loop bar of wall, wall connecting rod is plugged in loop bar, wall connecting rod is equipped with groove, the length of loop bar is greater than or equal to the length of wall connecting rod, and the connector for connecting wall connecting rod and upright bar is provided in groove, and loop bar is connected close to pole tip and wall connecting rod far from the end thread of upright bar.In use, wall connecting rod is extracted out, upright bar and wall connecting rod are fixed together by connector, then crossbeam is passed through with upright bar and is fixed together, scaffold is formed, after construction, wall connecting rod is contracted in loop bar, then wall is blocked, when needing to reuse, will be opened at wall closure, then loop bar is extracted out, in this way the wall-connecting piece of the scaffold not only can Reusability, and do not need by wall connecting rod expose wall part dismiss, the present invention has the effect of not wasting material.
Description
Technical field
The present invention relates to technical field of building construction more particularly to a kind of scaffolds and its building method.
Background technique
Scaffold is the generic term of architecture field, is that construction site is worker operation and solves vertically and horizontally to transport and take
The various brackets built.On construction site, scaffold is generally used for exterior wall, interior decoration or the higher ground that can not directly construct of layer height
Side, in order to which construction personnel up and down go along with sb. to guard him and high-altitude installation component etc. by operation or perimeter security net.In construction, lead to
Often need to build scaffold, and in order to ensure the stabilization of scaffold, it needs to fix the steel pipe of scaffold with concrete structure.Button
Part formula steel tube outer scaffold is widely used in building engineering construction, and how reliable external scaffolding is with main structure
Connection, is to ensure that the key of unstable failure does not occur for external scaffolding.
A kind of external wall scaffold wall connecting piece is disclosed in the Chinese patent that Authorization Notice No. is CN207228607U, is wrapped
Built-in fitting, connector and fastener are included, built-in fitting is L-shaped, and when use is consolidated the bared end of connector and L shape built-in fitting with fastener
It is fixed, shore one end of connector in concrete structural surface, using fastener by the connector other end and scaffold
Upright bar is fixed, and after construction, removes scaffold, the part that L shape built-in fitting exposes is dismissed, and is carried out next step decoration construction and is
It can.
The part for exposing built-in fitting is needed to dismiss but in above-mentioned technical proposal, after construction, it is not only troublesome and unrestrained
Take material.
Summary of the invention
The purpose of the present invention one is to provide a kind of scaffold, has the advantages that save material and repeat practical.
Foregoing invention purpose one of the invention has the technical scheme that
A kind of scaffold, including it is embedded in the intracorporal wall-connecting piece of wall, crossbeam and upright bar, the wall-connecting piece includes being embedded in wall
Loop bar, be plugged with wall connecting rod in the loop bar, the length direction on the periphery wall of the wall connecting rod along wall connecting rod is uniformly provided with
Multiple grooves in a ring, the wall connecting rod are provided with baffle of the cross section not less than the cross section of loop bar far from set boom end,
The length of the loop bar is greater than or equal to the length of the wall connecting rod, is provided in the groove for connecting wall connecting rod and standing
The connector of bar, the loop bar are connected close to pole tip and wall connecting rod far from the end thread of upright bar.
Implement above-mentioned technical proposal and then rotate wall connecting rod in use, wall connecting rod is extracted out, so that wall connecting rod is far from vertical
Rod end is threadedly coupled with loop bar, and wall connecting rod position is fixed at this time, the axial movement along loop bar is not easy, then according to upright bar and wall
The distance between body selects suitable groove, and upright bar and wall connecting rod are fixed together by connector, then by crossbeam and vertical
Bar forms scaffold, after the completion of then constructing, upright bar is separated with crossbeam, upright bar with wall connecting rod, rotate by being fixed together
Wall connecting rod slides wall connecting rod freely in loop bar, and wall connecting rod is contracted in loop bar, then blocks wall
It is good, it when needing to reuse, will be opened at wall closure, to expose baffle, then extract loop bar out, in this way the scaffold
Wall-connecting piece not only can Reusability, and the part for not needing to expose wall connecting rod wall is dismissed, more convenient in this way and do not waste
Material, and also can according to need adjustment the distance between upright bar and wall in this way, improve the applicability of the scaffold；Baffle
Setting, when so that wall connecting rod being contracted in loop bar, baffle will be abutted with loop bar close to upright bar end, to facilitate taking-up wall connecting rod.
Further, the connector includes the wirerope being arranged in groove, and one end of the wirerope is fixedly connected on
Groove is interior, the other end is wrapped in groove, is provided with fixing piece on the wirerope.
Implement above-mentioned technical proposal, in use, wall connecting rod is extracted out, according to the distance between upright bar and wall, selection is closed
Wirerope is unfolded from wall connecting rod, then makes steel wire penetrating upright bar, upright bar and wall connecting rod are banded in one by suitable groove
It rises, is fixed finally by fixing piece, so that wirerope is not easy to unclamp, structure is simple, easy to operate.
Further, the fixing piece includes the inserted link for being arranged in one, wirerope, and the inserted link is hinged far from steel wire rope end
There is kelly, be additionally provided between the kelly and inserted link so that the kelly has the elastic component of the trend of separate inserted link always,
The circular slotting ring for inserted link and kelly insertion is provided in groove, when the elastic component is in original state, the inserted link and card
Angle between bar is normality angle, and the angle is corresponding when the diameter of the slotting ring is less than the normality angle between inserted link and kelly
Be the chord length of the circle of dot by the hinge joint of radius, inserted link and kelly of kelly, be provided on the inserted link for limiting card
The limited part of bar angle.
Implement above-mentioned technical proposal, after banding together upright bar and wall connecting rod using wirerope, by inserted link and kelly
It is inserted into slotting ring together, after inserted link is plugged in slotting ring with snap ring, snap ring will be with inserted link point under the action of the elastic member
It opens to normality angle, inserted link will be unable to deviate from out of slotting ring with kelly at this time, so that upright bar links together with wall connecting rod,
The setting of limited part is for limiting the angle between kelly and inserted link, so that the maximum angle between kelly and inserted link is normality angle
Degree.
Further, the limited part be inclined at inserted link make kelly maximum rotation angle no more than normality angle
Block.
Implement above-mentioned technical proposal, when kelly turns under the action of the elastic member to abut with block, kelly can not be after
It is continuous to be rotated towards the direction far from inserted link, so that the maximum angle between kelly and inserted link is normality angle.
Further, the slotting ring is along axial vertical with wall connecting rod, the inserted link be arranged in the notch edge of groove, be suspended from it is recessed
The top of slot slot bottom.
Implement above-mentioned technical proposal, in this way when steel cable to be wound in groove, part steel cable will be located under slotting ring
Side, so that slotting ring plays the role of limit.
Further, antirust coat is provided on the baffle.
Implement above-mentioned technical proposal, the setting of antirust coat is got rusty for avoiding because of baffle, and is impacted to wall.
Further, it is uniformly provided with the slot in rectangle along axial direction on the crossbeam and the outer wall of upright bar, is located at the crossbeam
It is provided through through-hole with concentric on the slot bottom of two slots opposite in upright bar, is equipped with bolt in the through-hole,
The bolt is threaded with nut far from screw head end.
Implement above-mentioned technical proposal, when crossbeam is fixed to together with upright bar, so that being located at slot on crossbeam and being located at vertical
Slot on bar is plugged in together, and is then threaded through through-hole using bolt, and the end of bolt will run through crossbeam and stand at this time
Then bar uses nut that crossbeam is fixed together with upright bar, such upright bar and crossbeam are not easy after fixation along axial generation
Sliding, leads to scaffold built on the sand.
The purpose of the present invention two is to provide a kind of building method of scaffold, have the advantages that more convenient.
Above-mentioned purpose two of the invention has the technical scheme that
The building method of scaffold, has follow steps:
S1: bracing wire positions in building structure；
S2: the pedestal for being used to install upright bar is fixed on the ground；
S3: supporting structure is built；
S4: upright bar is fixed on pedestal,；
S5: extracting wall connecting rod out from being embedded in the intracorporal loop bar of wall, and rotation wall connecting rod is threadedly coupled wall connecting rod with loop bar, then
Upright bar is fixed using wirerope and is fixed together with wall connecting rod, and is fixed to the movable end of wirerope by fixing piece
On wall connecting rod；
S6: so that crossbeam and upright bar are plugged in together each other by slot, then being threaded through bolt, and rotating nuts are fixed horizontal
Beam and upright bar；
S7: Crossing brace is installed between upright bar and upright bar；
S8: safety net is hanged up on the outside of scaffold；
S9: scaffold board and foot guard plate are laid between crossbeam.
Implement above-mentioned technical proposal, in step S6, crossbeam is not easy to be slided along respective axial direction after linking together with upright bar
It moves, guarantees the stability of scaffold, and upright bar and crossbeam can be fixed to together by rotating bolt in this way, it is more convenient；
In step S7, Crossing brace is connected in upright bar, increases the intensity of scaffold, so that scaffold is more firm；In step S8,
Safety net is hung for preventing construction personnel from dropping from scaffold, and reduction construction personnel throws scaffold accidentally and causes injures and deaths
Probability；In step S9, the laying of the scaffold board and foot guard plate construction personnel that is more convenient for walks about on scaffold.
In conclusion advantageous effects of the invention are as follows:
1. the wall-connecting piece of the scaffold not only can Reusability, and do not need by wall connecting rod expose wall part dismiss, in this way
Do not waste material；
2. crossbeam is not easy to be slid along respective axial direction after linking together with upright bar, guarantee the stability of scaffold.
Detailed description of the invention
Fig. 1 is the overall structure diagram of scaffold of the invention.
Fig. 2 is the configuration schematic diagram of wall-connecting piece of the invention.
Fig. 3 is the partial enlargement diagram of part A in Fig. 2.
Fig. 4 is the configuration schematic diagram of upright bar and crossbeam of the invention.
Fig. 5 is the building method flow chart of scaffold of the invention.
In figure, 1, loop bar；11, wall connecting rod；12, groove；121, wirerope；122, slotting ring；13, baffle；2, upright bar；3, horizontal
Beam；31, slot；311, through-hole；312, bolt；313, nut；4, fixing piece；41, inserted link；411, block；42, kelly.
Specific embodiment
Below in conjunction with attached drawing, invention is further described in detail.
Referring to Fig.1, it is a kind of scaffold disclosed by the invention, including is embedded in the intracorporal wall-connecting piece of wall, crossbeam 3 and upright bar
2。
Referring to Fig. 2, wherein wall-connecting piece includes being embedded in the intracorporal wall connecting rod 11 loop bar 1 and be plugged in loop bar 1 of wall,
The length of loop bar 1 is greater than or equal to the length of wall connecting rod 11, and loop bar 1 is close to 2 end of upright bar and end of the wall connecting rod 11 far from upright bar 2
Portion is threadedly coupled, and wall connecting rod 11 is T-shaped along axial cross section in the present embodiment, and its edge is perpendicular to axial cross section face
The biggish one end of product is threadedly coupled with loop bar 1, and wall connecting rod 11 is along perpendicular to the axial lesser part of cross-sectional area and loop bar 1
Between there are can for wirerope 121 enter loop bar 1 in gap；Along the length side of wall connecting rod 11 on the periphery wall of wall connecting rod 11
To multiple grooves 12 in a ring are uniformly provided with, it is wound with wirerope 121 in groove 12, one end of wirerope 121 is fixedly connected
In groove 12, the other end is wrapped in groove 12 and is provided with fixing piece 4；Wall connecting rod 11 is provided with cross far from 1 end of loop bar
Section is not less than the baffle 13 of the cross section of loop bar 1, is provided with antirust coat on baffle 13.
Referring to Fig. 3, fixing piece 4 includes the inserted link 41 for being arranged in 121 1, wirerope, and inserted link 41 is far from wirerope 121
End is hinged with kelly 42, and when kelly 42 is rotated using the hinge joint of kelly 42 and inserted link 41 as the center of circle, kelly 42 and inserted link 41 begin
Final position is additionally provided between same level, kelly 42 and inserted link 41 so that kelly 42 has the trend far from inserted link 41 always
Elastic component, elastic component is the torsional spring that kelly 42 Yu 41 hinge joint of inserted link is arranged in the present embodiment, and elastic component is in initial shape
When state, the angle between inserted link 41 and kelly 42 is normality angle, block 411 is tiltedly installed on inserted link 41, when kelly 42 exists
It is turned under the action of elastic component when being abutted with block 411, torsional spring is in nature, between kelly 42 and inserted link 41 most at this time
Wide-angle is normality angle.
Referring to Fig. 3, the circular slotting ring 122 being inserted into for inserted link 41 and kelly 42 is provided in groove 12, slotting ring 122 is along axis
To vertical with wall connecting rod 11, and when the diameter of slotting ring 122 is less than the normality angle between inserted link 41 and kelly 42, the angle is corresponding
Using kelly 42 be radius, the hinge joint of inserted link 41 and kelly 42 is the chord length of the circle of dot, in this way when inserted link 41 and kelly 42
It is inserted into slotting ring 122, will be not easy to deviate from out of slotting ring 122；Inserted link 41 is arranged in the notch edge of groove 12, is suspended from groove 12
The top of slot bottom, in this way when steel cable to be wound in groove 12, part steel cable will be located at the lower section of slotting ring 122, so that inserting
Ring 122 plays the role of limit.
Referring to Fig. 4, it is uniformly provided with the slot 31 in rectangle along axial direction on the outer wall of crossbeam 3 and upright bar 2, and be located at crossbeam 3
It is provided through through-hole 311 with concentric on the slot bottom of two slots 31 opposite in upright bar 2, is equipped with bolt in through-hole 311
312, bolt 312 is threaded with nut 313 far from screw head end.
The present embodiment implementation principle are as follows: in use, wall connecting rod 11 is extracted out, wall connecting rod 11 is then rotated, so that wall connecting rod
11 2 end of separate upright bar is threadedly coupled, and 11 position of wall connecting rod is fixed at this time, is not easy the axial movement along loop bar 1, then basis
The distance between upright bar 2 and wall select suitable groove 12, and wirerope 121 is unfolded from wall connecting rod 11, then makes steel
Cord 121 passes through upright bar 2, and after upright bar 2 and wall connecting rod 11 are banded together, inserted link 41 and kelly 42 are inserted into slotting ring together
In 122, after inserted link 41 and snap ring are plugged in slotting ring 122, under the action of the elastic member snap ring will be separated with inserted link 41 to
Normality angle, inserted link 41 will be unable to deviate from out of slotting ring 122 with kelly 42 at this time, then start that slot 31 on crossbeam 3 will be located at
It is plugged in together with the slot 31 being located in upright bar 2, so that bolt 312 is threaded through through-hole 311, the end of bolt 312 at this time
Crossbeam 3 and upright bar 2 will be run through, scaffold can be formed by then using nut 313 that crossbeam 3 and upright bar 2 are fixed together,
Upright bar 2 and crossbeam 3 are not easy to slide along axial after fixation in this way, lead to scaffold built on the sand, will after the completion of then constructing
Upright bar 2 is separated with crossbeam 3, upright bar 2 with wall connecting rod 11, is rotated wall connecting rod 11, is allowed the free skating in loop bar 1 of wall connecting rod 11
It moves, wall connecting rod 11 is contracted in loop bar 1, is then blocked wall, when needing to reuse, will be beaten at wall closure
Open, to expose baffle 13, then extract loop bar 1 out, in this way the wall-connecting piece of the scaffold not only can Reusability, and do not need
The part that wall connecting rod 11 exposes wall is dismissed, does not waste material in this way.
Referring to Fig. 5, it is a kind of building method of scaffold disclosed by the invention, has follow steps:
S1: bracing wire positions in building structure；
S2: the pedestal for being used to install upright bar 2 is fixed on the ground；
S3: supporting structure is built；
S4: upright bar 2 is fixed on pedestal；
S5: extracting wall connecting rod 11 out from being embedded in the intracorporal loop bar 1 of wall, and rotation wall connecting rod 11 makes wall connecting rod 11 and 1 screw thread of loop bar
Then connection is passed through the fixed infall with wall connecting rod 11 of upright bar 2 using wirerope 121, so that wirerope 121 is in cross
The inserted link 41 of 121 free end of wirerope and kelly 42, are then inserted into slotting ring 122 by type winding；
S6: so that crossbeam 3 is plugged in together with upright bar 2 each other by slot 31, then being threaded through bolt 312, rotates spiral shell
313 fixed cross beam 3 of mother and upright bar 2；
S7: Crossing brace is installed between upright bar 2 and upright bar 2, wherein every Crossing brace across 3-5 root upright bar 2, and with upright bar 2 it
Between the angle that is formed be 45 ° -60 ° angle；
S8: hanging up safety net on the outside of scaffold, for preventing construction personnel from dropping from scaffold, reduces construction personnel not
The careful probability thrown scaffold and cause injures and deaths；
S9: it is laid with scaffold board and foot guard plate, between crossbeam 3 in order to which construction personnel walks about on scaffold.
Claims (8)
1. a kind of scaffold, including it is embedded in the intracorporal wall-connecting piece of wall, crossbeam (3) and upright bar (2), it is characterised in that: the company
Wall part includes being embedded in the intracorporal loop bar of wall (1), is plugged with wall connecting rod (11) in the loop bar (1), the wall connecting rod (11)
Length direction on periphery wall along wall connecting rod (11) is uniformly provided with multiple grooves (12) in a ring, and the wall connecting rod (11) is separate
Loop bar (1) end is provided with cross section not less than loop bar (1) cross section baffle (13), the length of the loop bar (1) be greater than or
Equal to the length of the wall connecting rod (11), it is provided in the groove (12) for connecting wall connecting rod (11) and upright bar (2)
Connector, the loop bar (1) connect with wall connecting rod (11) far from the end thread of upright bar (2) close to upright bar (2) end.
2. scaffold according to claim 1, it is characterised in that: the connector includes the steel being arranged in groove (12)
Cord (121), one end of the wirerope (121) is fixedly connected in groove (12), the other end is wrapped in groove (12), institute
It states and is provided with fixing piece (4) on wirerope (121).
3. scaffold according to claim 2, it is characterised in that: the fixing piece (4) includes being arranged in wirerope (121)
One inserted link (41), the inserted link (41) are hinged with kelly (42) far from wirerope (121) end, the kelly (42) and inserted link
(41) it is additionally provided between so that the kelly (42) has the elastic component of the trend far from inserted link (41) always, groove (12) is interior
It is provided with the circular slotting ring (122) for inserted link (41) and kelly (42) insertion, it is described to insert when the elastic component is in original state
Angle between bar (41) and kelly (42) is normality angle, and the diameter of the slotting ring (122) is less than inserted link (41) and kelly
(42) it with kelly (42) is that radius, inserted link (41) and the hinge joint of kelly (42) are that the angle is corresponding when normality angle between
The chord length of the circle of dot is provided with the limited part for limiting kelly (42) angle on the inserted link (41).
4. scaffold according to claim 3, it is characterised in that: the limited part is to be inclined at making for inserted link (41)
Obtain the block (411) that kelly (42) maximum rotation angle is not more than normality angle.
5. scaffold according to claim 4, it is characterised in that: the slotting ring (122) is hung down along axial direction and wall connecting rod (11)
Directly, the inserted link (41) setting groove (12) notch edge, be suspended from the top of groove (12) slot bottom.
6. scaffold according to claim 1, it is characterised in that: be provided with antirust coat on the baffle (13).
7. scaffold according to claim 2, it is characterised in that: along axial direction on the outer wall of the crossbeam (3) and upright bar (2)
It is uniformly provided with the slot (31) in rectangle, is located at the slot of two slots (31) opposite on the crossbeam (3) and upright bar (2)
It is provided through on bottom through-hole (311), is equipped with bolt (312) in the through-hole (311) with one heart, the bolt (312) is remote
Nut (313) are threaded with from screw head end.
8. the building method based on scaffold as claimed in claim 7, it is characterised in that: have follow steps:
S1: bracing wire positions in building structure；
S2: the pedestal for being used to install upright bar (2) is fixed on the ground；
S3: supporting structure is built；
S4: upright bar (2) is fixed on pedestal；
S5: wall connecting rod (11) are extracted out from being embedded in the intracorporal loop bar of wall (1), rotation wall connecting rod (11) makes wall connecting rod (11) and set
Bar (1) is threadedly coupled, and is then fixed upright bar (2) using wirerope (121) and is fixed together with wall connecting rod (11), and leads to
It crosses fixing piece (4) movable end of wirerope (121) is fixed on wall connecting rod (11)；
S6: so that crossbeam (3) is plugged in together with upright bar (2) each other by slot (31), then bolt (312) is passed through and are led to
It crosses, rotating nuts (313) fixed cross beam (3) and upright bar (2)；
S7: Crossing brace is installed between upright bar (2) and upright bar (2)；
S8: safety net is hanged up on the outside of scaffold；
S9: scaffold board and foot guard plate are laid between crossbeam (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910082540.1A CN109707149B (en) | 2019-01-28 | 2019-01-28 | Scaffold and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910082540.1A CN109707149B (en) | 2019-01-28 | 2019-01-28 | Scaffold and construction method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109707149A true CN109707149A (en) | 2019-05-03 |
| CN109707149B CN109707149B (en) | 2020-11-13 |
Family
ID=66263215
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910082540.1A Active CN109707149B (en) | 2019-01-28 | 2019-01-28 | Scaffold and construction method thereof |
Country Status (1)
| Country | Link |
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| CN (1) | CN109707149B (en) |
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| CN202627474U (en) * | 2012-04-14 | 2012-12-26 | 安徽省舒城三乐童车有限责任公司 | Wall connecting device of building scaffold |
| CN102943562A (en) * | 2012-12-03 | 2013-02-27 | 张若美 | Adjustable wall connecting rod of steel pipe scaffold |
| WO2014162371A1 (en) * | 2013-04-03 | 2014-10-09 | 株式会社カシワバラ・コーポレーション | Mounting bracket |
| CN204186058U (en) * | 2014-10-21 | 2015-03-04 | 湖南拯卫建设科技有限公司 | A kind of multipurpose wall-connecting piece |
| CN208056608U (en) * | 2017-07-07 | 2018-11-06 | 中建海峡建设发展有限公司 | A kind of scaffold attached wall wall-connecting piece device |
| CN109138397A (en) * | 2018-09-28 | 2019-01-04 | 浙江广安建设有限公司 | A kind of overhanging scaffold and its building method |
| CN208329580U (en) * | 2018-06-19 | 2019-01-04 | 郭东良 | A kind of external wall scaffold wall connecting piece |
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2019
- 2019-01-28 CN CN201910082540.1A patent/CN109707149B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202627474U (en) * | 2012-04-14 | 2012-12-26 | 安徽省舒城三乐童车有限责任公司 | Wall connecting device of building scaffold |
| CN102943562A (en) * | 2012-12-03 | 2013-02-27 | 张若美 | Adjustable wall connecting rod of steel pipe scaffold |
| WO2014162371A1 (en) * | 2013-04-03 | 2014-10-09 | 株式会社カシワバラ・コーポレーション | Mounting bracket |
| CN204186058U (en) * | 2014-10-21 | 2015-03-04 | 湖南拯卫建设科技有限公司 | A kind of multipurpose wall-connecting piece |
| CN208056608U (en) * | 2017-07-07 | 2018-11-06 | 中建海峡建设发展有限公司 | A kind of scaffold attached wall wall-connecting piece device |
| CN208329580U (en) * | 2018-06-19 | 2019-01-04 | 郭东良 | A kind of external wall scaffold wall connecting piece |
| CN109138397A (en) * | 2018-09-28 | 2019-01-04 | 浙江广安建设有限公司 | A kind of overhanging scaffold and its building method |
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| Publication number | Publication date |
|---|---|
| CN109707149B (en) | 2020-11-13 |
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