CN109457929A - One kind can turnover type elevator formwork operating platform and its construction method - Google Patents
One kind can turnover type elevator formwork operating platform and its construction method Download PDFInfo
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- CN109457929A CN109457929A CN201811384629.5A CN201811384629A CN109457929A CN 109457929 A CN109457929 A CN 109457929A CN 201811384629 A CN201811384629 A CN 201811384629A CN 109457929 A CN109457929 A CN 109457929A
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- operating platform
- supports
- vertical supports
- steel
- frame body
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Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G3/00—Scaffolds essentially supported by building constructions, e.g. adjustable in height
- E04G3/24—Scaffolds essentially supported by building constructions, e.g. adjustable in height specially adapted for particular parts of buildings or for buildings of particular shape, e.g. chimney stacks or pylons
- E04G3/246—Scaffolds essentially supported by building constructions, e.g. adjustable in height specially adapted for particular parts of buildings or for buildings of particular shape, e.g. chimney stacks or pylons following the inside contour of a building
Abstract
It can turnover type elevator formwork operating platform the invention discloses one kind, including lifting frame body and operating platform, the operating platform is horizontally set at the top of the lifting frame body, both ends are tiltedly installed with inclined support below the lifting frame body, and vertical supports are vertically arranged with below two inclined supports, top is welded with interior leg brace rod piece between two inclined supports and two vertical supports.The beneficial effects of the present invention are: the present invention simplifies the construction technology of operating platform, saves lease equipment dosage, reduce hiring cost without setting up scaffold from bottom to top inside elevator；Template bottom can directly rest on the first step operating platform when elevator inner side template is installed, and be not required to embedded bar support；In the operating platform of construction layer setting, inspect for acceptance convenient for administrative staff to template installation quality；Elevator inner side template can be in place with the whole lifting upwards of operating platform after removing, time saving and energy saving.
Description
Technical field
The present invention relates to a kind of operating platforms, and specially one kind can turnover type elevator formwork operating platform and its construction
Method belongs to elevator formwork operating platform applied technical field.
Background technique
It is high-rise more and more with the development of urban construction, at present in high-rise building elevator shaft, shear wall formwork construction
Operating platform generallys use console mode (overhanging type) steel tube fastener scaffold, and console mode steel tube fastener scaffold is in practice of construction
There is security risk is larger, influence template construction progress, is not easy to elevator when scaffold building, dismounting trouble, worker's construction
Well template installation quality inspects for acceptance, is not easy to building waste cleaning in hoistway, the long-term defect for overstocking a large amount of lease equipment.
Summary of the invention
The object of the invention is that in order to solve shear wall formwork construction operation platform, there is feet in practice of construction
Security risk is larger when hand cradle is set up, dismounting bothers, worker constructs, influences template construction progress, is not easy to hoistway formwork peace
Packing quality inspects for acceptance, is not easy to building waste cleaning in hoistway, long-term the problem of overstocking a large amount of lease equipment, and proposes one
Kind can turnover type elevator formwork operating platform and its construction method.
The purpose of the present invention can be achieved through the following technical solutions: one kind can the operation of turnover type elevator formwork it is flat
Platform, including lifting frame body and operating platform, the operating platform are horizontally set at the top of the lifting frame body；
Both ends are tiltedly installed with inclined support below the lifting frame body, and longitudinal below two inclined supports
Vertical supports are provided with, top is welded with interior leg brace rod piece between two inclined supports and two vertical supports,
The vertical supports of the elevator formwork operating platform, inclined support are all made of 12# channel steel, are welded on tiltedly after vertical supports beveling
To the back side of bracket channel steel, and welding by both sides is used, weld seam is full, and every vertical supports are apart from the oblique channel steel edge 200mm in bottom；
Two inclined support bottoms are provided with angle steel one, and two inclined supports be respectively perpendicular be welded on it is described
One both ends of angle steel；
It is vertical setting at the top of two vertical supports with the operating platform bottom end, and two described vertical
Cradle top one end is vertically installed with horizontal channel steel, and two vertical supports and the horizontal channel steel are solid by bolt
Fixed connection；
Wherein, it is vertically welded with horizontal bracket between the operating platform at the top of two vertical supports, reinforced
The stability of operating platform, improves the intensity of operating platform entirety.
Further Technological improvement plan of the invention is: the inclined support, vertical supports and interior leg brace rod piece bracket
Triangular structure is formed, it is firm to guarantee more to consolidate when operating platform work uses, and interior leg brace rod piece is in inclined support
It is vertically arranged, inclined support top holds out against elevator sidewall, and lower part is stuck at flooring side bar by the angle steel welded, and passes through company
The stability of extension bar guarantee frame body.
Further Technological improvement plan of the invention is: the junction of two vertical supports and two inclined supports
Middle part is provided with connecting rod between lower section and two inclined supports, and two vertical supports are respectively welded at the connecting rod
Both ends, and two extension bars are set in parallel with angle steel one on two inclined supports, and even respectively at connecting rod both ends.
Further Technological improvement plan of the invention is: the horizontal channel steel with two horizontal brackets are perpendicular sets
It sets, and is equidistantly vertically arranged between two horizontal brackets there are three angle steel two.
Further Technological improvement plan of the invention is: the operating platform by the bolts of three spaced sets with
Lifting frame body, which is anchored, to be fixed, which is connected by screw bolts with operating platform, facilitates peace to tear open, allow to have enough to meet the need repeatedly
It uses, to save cost, has achieved the purpose that cost efficiency, and improve the fastness of operating platform entirety, operate
The junction both ends of mesa base and angle steel two are welded with round steel hanging ring, entirety lifting operation platform when facilitating construction.
Further Technological improvement plan of the invention is: the cross-sectional length of the angle steel one is 100mm, and cross-sectional width is
100mm, depth of section 8mm, and the cross-sectional length of the angle steel two is 30mm, cross-sectional width 30mm, depth of section is
3mm, and the section of angle steel one and angle steel two is L-shaped structure, and is respectively provided between operating platform at the top of two inclined supports
There are vertical supports, the inclined support bottom of the elevator formwork operating platform is welded on 100mm × 100mm × 8mm angle steel one
The back side, angle steel opening position holds out against at flooring side bar, and top holds out against elevator sidewall, can fix hoisting frame well；For
The stability for guaranteeing frame body passes through anchor bolt using three 30mm of upper, middle and lower × 30mm × 3mm angle steel two between inclined support
It is fixed.
It is a kind of can turnover type elevator formwork operating platform construction method, this method specifically includes the following steps:
Step 1: lifting frame body is by using between two inclined supports, four vertical supports, inclined support and vertical supports
The trigonometric expression frame body that two interior leg brace rod pieces are welded holds out against elevator sidewall by inclined support top, under inclined support
Portion is stuck at flooring side bar by the angle steel welded；
Step 2: in every two vertical supports, being arranged two vertical equity brackets, and welds three on the whole and be uniformly distributed
Angle steel；Operating platform passes through three bolts being evenly arranged and is anchored on lifting frame body, and there are two round steel hanging rings for weldering, vertically
Bracket, inclined support are all made of 12# channel steel, the back side of inclined support channel steel are welded on after vertical supports beveling, and using two-sided
Weldering, weld seam is full, and every vertical supports are apart from the oblique channel steel edge 200mm in bottom；
Step 3: the elevator formwork is processed into operating platform using 2mm thick steel plate, and plane sizes are according to elevator
Size is fixed, is 3cm or so from surrounding shear wall spacing, welds four round steel hanging rings on the operational platform, round steel hanging ring diameter is
20mm is smoothly sling when to enable operating platform integrally to be promoted, round steel hanging ring when installing round steel hanging ring, on the inside of elevator shaft
More offset 20cm inwardly than the hanging ring round steel in outside, enable platform suitably to tilt certain angle when lifting by crane.
Compared with prior art, the beneficial effects of the present invention are:
1, the present invention is not necessarily to set up scaffold from bottom to top inside elevator, simplifies the construction technology of operating platform,
Lease equipment dosage is saved, hiring cost is reduced；Template bottom can directly rest on when elevator inner side template is installed
On first step operating platform, it is not required to embedded bar support；In the operating platform of construction layer setting, template is pacified convenient for administrative staff
Packing quality is inspected for acceptance；Elevator inner side template can be in place with the whole lifting upwards of operating platform after removing, time saving province
Power.
2, the present invention is fixed, intensity with higher, safety has mainly using materials such as steel plate, angle steel by anchor bolt
It ensures.Using detachable lifting frame body, peace is facilitated to tear open, time and labour saving can be used in turn repeatedly, so that cost has been saved,
Cost efficiency is achieved the purpose that.It can guarantee construction safety again, the probability that security risk occurs in construction, the operation be effectively reduced
Platform is easy to operate, firm and durable, has good social benefit, is suitble to promote the use of.
Detailed description of the invention
In order to facilitate the understanding of those skilled in the art, the present invention will be further described below with reference to the drawings.
Fig. 1 is stereochemical structure perspective view of the invention.
Side structure schematic diagram when Fig. 2 is present invention installation.
Fig. 3 is the connecting node incline structure detail drawing of vertical supports of the present invention and horizontal bracket.
Fig. 4 is the connecting node stereochemical structure detail drawing of vertical supporting of the present invention and horizontal bracket.
In figure: 1, inclined support；2, vertical supports；3, horizontal bracket；4, interior leg brace rod piece；5, angle steel one；6, connecting rod；
7, horizontal channel steel；8, angle steel two；9, operating platform；10, bolt；11, round steel hanging ring.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with embodiment, it is clear that described reality
Applying example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is general
Logical technical staff all other embodiment obtained without creative efforts belongs to what the present invention protected
Range.
Please refer to shown in Fig. 1-4, one kind can turnover type elevator formwork operating platform, including lifting frame body and operation it is flat
Platform 9, operating platform 9 are horizontally set at the top of lifting frame body；
Both ends are tiltedly installed with inclined support 1 below lifting frame body, and two 1 lower sections of inclined support are vertically arranged with
Vertical supports 2, top is welded with interior leg brace rod piece 4 between two inclined supports 1 and two vertical supports 2, the elevator branch
The vertical supports 2 of mould operating platform, inclined support 1 are all made of 12# channel steel, and vertical supports 2 are welded on inclined support 1 after chamferring
The back side of channel steel, and welding by both sides is used, weld seam is full, and every vertical supports are apart from the oblique channel steel edge 200mm in bottom；
Two 1 bottoms of inclined support are provided with angle steel 1, and two inclined supports 1 are respectively perpendicular and are welded on one 5 liang of angle steel
End；
Two 2 tops of vertical supports are vertical setting with 9 bottom end of operating platform, and two 2 tops of vertical supports
One end is vertically installed with horizontal channel steel 7, and two vertical supports 2 are fixedly connected by bolt 10 with horizontal channel steel 7；
Wherein, it is vertically welded with horizontal bracket 3 between two 2 tops of vertical supports and operating platform 9, strengthens operation
The stability of platform 9 improves the intensity of operating platform entirety.
As a kind of technical optimization scheme of the invention, inclined support 1, vertical supports 2 and 4 bracket of interior leg brace rod piece are formed
Triangular structure, it is firm to guarantee more to consolidate when operating platform work uses, and interior leg brace rod piece 4 and inclined support 1 are in vertical
Straight setting, 1 top of inclined support hold out against elevator sidewall, and lower part is stuck at flooring side bar by the angle steel 5 of welding, and passes through company
The stability of the guarantee frame body of extension bar 6.
As a kind of technical optimization scheme of the invention, under the junction of two vertical supports 2 and two inclined supports 1
Middle part is provided with connecting rod 6 between side and two inclined supports 1, and two vertical supports 2 are respectively welded at 6 liang of connecting rod
End, and two extension bars 6 are set in parallel with angle steel 1 on two inclined supports 1, and even respectively at connecting rod 6 both ends.
As a kind of technical optimization scheme of the invention, horizontal channel steel 7 is vertical setting with two horizontal brackets 3, and
Angle steel 28 there are three being equidistantly vertically arranged between two horizontal brackets 3.
As a kind of technical optimization scheme of the invention, operating platform 9 by the bolts 10 of three spaced sets with mention
It rises frame body and is anchored fixation, which is connected using bolt 10 with operating platform, facilitate peace to tear open, allow to have enough to meet the need repeatedly
It uses, to save cost, has achieved the purpose that cost efficiency, and improve the fastness of operating platform entirety, operate
9 bottom of platform and the junction both ends of angle steel 28 are welded with round steel hanging ring 11, entirety lifting operation platform when facilitating construction.
As a kind of technical optimization scheme of the invention, the cross-sectional length of angle steel 1 is 100mm, and cross-sectional width is
100mm, depth of section 8mm, and the cross-sectional length of angle steel 28 be 30mm, cross-sectional width 30mm, depth of section 3mm, and
The section of angle steel 1 and angle steel 28 is L-shaped structure, and is provided between two 1 tops of inclined support and operating platform 9
Vertical supports 2, the inclined support bottom of the elevator formwork operating platform are welded on 100mm × 100mm × 8mm angle steel 1
The back side, angle steel opening position holds out against at flooring side bar, and top holds out against elevator sidewall, can fix hoisting frame well；For
The stability for guaranteeing frame body passes through anchor bolt using three 30mm of upper, middle and lower × 30mm × 3mm angle steel 28 between inclined support
It is fixed.
It is a kind of can turnover type elevator formwork operating platform construction method, this method specifically includes the following steps:
Step 1: lifting frame body be by two inclined supports, 1, four vertical supports 2, inclined support 1 and vertical supports 2 it
Between the trigonometric expression frame body that is welded with two interior leg brace rod pieces 4, elevator sidewall is held out against by 1 top of inclined support, it is oblique
1 lower part of bracket is stuck at flooring side bar by the angle steel 5 of welding；
Step 2: in every two vertical supports 2, being arranged two vertical equity brackets 3, and welds three on the whole and uniformly divide
The angle steel 8 of cloth；Operating platform 9 passes through three bolts 10 being evenly arranged and is anchored on lifting frame body, and welds and hang there are two round steel
Ring 11, vertical supports 2, inclined support 1 are all made of 12# channel steel, and vertical supports 2 are welded on the back of 1 channel steel of inclined support after chamferring
Face, and welding by both sides is used, weld seam is full, and every vertical supports 2 are apart from the oblique channel steel edge 200mm in bottom；
Step 3: the elevator formwork is processed into operating platform using 2mm thick steel plate, and plane sizes are according to elevator
Size is fixed, is 3cm or so from surrounding shear wall spacing, and four round steel hanging rings 11 are welded on operating platform 9, and round steel hanging ring 11 is straight
Diameter is 20mm, is smoothly sling when to enable operating platform integrally to be promoted, circle when installing round steel hanging ring 11, on the inside of elevator shaft
Steel hanging ring 11 is more offset 20cm more inside than the hanging ring round steel 11 in outside, and platform is enable suitably to tilt certain angle when lifting by crane.
Working principle: in the use of the present invention, firstly, the safety when operating platform uses is checked, then, by oblique
Elevator sidewall is held out against to 1 top of bracket, 1 lower part of inclined support is stuck at flooring side bar by the angle steel 5 of welding, staff
By standing on operating platform 9, to constructing in elevator；
In every two vertical supports 2, two vertical equity brackets 3 are set, and weld three equally distributed angles on the whole
Steel 8；Operating platform 9 passes through three bolts 10 being evenly arranged and is anchored on lifting frame body, and welds there are two round steel hanging ring 11, erects
It is all made of 12# channel steel to bracket 2, inclined support 1, vertical supports 2 are welded on the back side of 1 channel steel of inclined support after chamferring, and adopt
With welding by both sides, weld seam is full, and every vertical supports 2 are apart from the oblique channel steel edge 200mm in bottom；
The elevator formwork is processed into operating platform using 2mm thick steel plate, and plane sizes are fixed according to lift shaft dimensions,
It is 3cm or so from surrounding shear wall spacing, four round steel hanging rings 11 is welded on operating platform 9,11 diameter of round steel hanging ring is
20mm is smoothly sling when to enable operating platform integrally to be promoted, and when installing round steel hanging ring 11, the round steel on the inside of elevator shaft is hung
Ring 11 is more offset 20cm more inside than the hanging ring round steel 11 in outside, and platform is enable suitably to tilt certain angle when lifting by crane.
Present invention disclosed above preferred embodiment is only intended to help to illustrate the present invention.There is no detailed for preferred embodiment
All details are described, also do not limit the specific embodiment that the invention is only.Obviously, according to the content of this specification, can make
Many modifications and variations.These embodiments are chosen and specifically described to this specification, is original in order to better explain the present invention
Reason and practical application, so that skilled artisan be enable to better understand and utilize the present invention.The present invention is only authorized
The limitation of sharp claim and its full scope and equivalent.
Claims (7)
1. one kind can turnover type elevator formwork operating platform, it is characterised in that: including lifting frame body and operating platform (9),
The operating platform (9) is horizontally set at the top of the lifting frame body；
Both ends are tiltedly installed with inclined support (1) below the lifting frame body, and vertical below two inclined supports (1)
To being provided with vertical supports (2), top is welded between two inclined supports (1) and two vertical supports (2)
Interior leg brace rod piece (4)；
Two inclined support (1) bottoms are provided with angle steel one (5), and two inclined supports (1) are respectively perpendicular welding
At angle steel one (5) both ends；
It is vertical setting at the top of two vertical supports (2) with the operating platform (9) bottom end, and two described perpendicular
One end is vertically installed with horizontal channel steel (7) at the top of to bracket (2), and two vertical supports (2) and the horizontal channel steel
(7) it is fixedly connected by bolt (10)；
Wherein, horizontal bracket (3) are vertically welded between the operating platform (9) at the top of two vertical supports (2).
2. one kind according to claim 1 can turnover type elevator formwork operating platform, which is characterized in that described oblique
Bracket (1), vertical supports (2) and interior leg brace rod piece (4) bracket form triangular structure, and interior leg brace rod piece (4) and oblique branch
Frame (1) is vertical setting.
3. one kind according to claim 1 can turnover type elevator formwork operating platform, which is characterized in that described in two
The middle part company of being provided between the junction of vertical supports (2) and two inclined supports (1) lower section and two inclined supports (1)
Extension bar (6), and two vertical supports (2) are respectively welded at the connecting rod (6) both ends, and connecting rod (6) both ends are respectively two
On a inclined support (1), and even two extension bars (6) are set in parallel with angle steel one (5).
4. one kind according to claim 1 can turnover type elevator formwork operating platform, which is characterized in that the level
Channel steel (7) is vertical setting with two horizontal brackets (3), and is equidistantly vertically installed with three between two horizontal brackets (3)
A angle steel two (8).
5. one kind according to claim 1 can turnover type elevator formwork operating platform, which is characterized in that the operation
Platform (9) is anchored by the bolt (10) and lifting frame body of three spaced sets and is fixed, and operating platform (9) bottom and angle steel are lacked
The junction both ends of two (8) are welded with round steel hanging ring (11).
6. one kind according to claim 1 can turnover type elevator formwork operating platform, which is characterized in that the angle steel
The cross-sectional length of one (5) is 100mm, cross-sectional width 100mm, depth of section 8mm, and the section of the angle steel two (8) is long
Degree is 30mm, cross-sectional width 30mm, depth of section 3mm, and the section of angle steel one (5) and angle steel two (8) is L shape knot
Structure, and vertical supports (2) are provided between operating platform (9) at the top of two inclined supports (1).
7. one kind can turnover type elevator formwork operating platform construction method, which is characterized in that this method specifically include with
Lower step:
Step 1: lifting frame body is by two inclined supports (1), four vertical supports (2), inclined support (1) and vertical supports
(2) the trigonometric expression frame body being welded between with two interior leg brace rod pieces (4) holds out against elevator by inclined support (1) top
Side wall, inclined support (1) lower part are stuck at flooring side bar by the angle steel (5) of welding；
Step 2: on every two vertical supports (2), being arranged two vertical equity brackets (3), and welds three on the whole and uniformly divide
The angle steel (8) of cloth；Operating platform (9) passes through three bolts (10) being evenly arranged and is anchored on lifting frame body, and there are two welderings
Round steel hanging ring (11), vertical supports (2), inclined support (1) are all made of 12# channel steel, are welded on after vertical supports (2) beveling oblique
The back side of bracket (1) channel steel, and welding by both sides is used, weld seam is full, and every vertical supports (2) is apart from the oblique channel steel edge in bottom
200mm；
Step 3: the elevator formwork is processed into operating platform using 2mm thick steel plate, and plane sizes are according to lift shaft dimensions
It is fixed, it is 3cm from surrounding shear wall spacing, four round steel hanging rings (11), round steel hanging ring (11) diameter is welded on operating platform (9)
For 20mm, when installing round steel hanging ring (11), the hanging ring round steel (11) in round steel hanging ring (11) the ratio outside on the inside of elevator shaft is inside
More offset 20cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811384629.5A CN109457929A (en) | 2018-11-20 | 2018-11-20 | One kind can turnover type elevator formwork operating platform and its construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811384629.5A CN109457929A (en) | 2018-11-20 | 2018-11-20 | One kind can turnover type elevator formwork operating platform and its construction method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109457929A true CN109457929A (en) | 2019-03-12 |
Family
ID=65611156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811384629.5A Pending CN109457929A (en) | 2018-11-20 | 2018-11-20 | One kind can turnover type elevator formwork operating platform and its construction method |
Country Status (1)
| Country | Link |
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| CN (1) | CN109457929A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110005183A (en) * | 2019-04-22 | 2019-07-12 | 上海建工一建集团有限公司 | Elevator shaft promotes platform |
| CN110158935A (en) * | 2019-05-07 | 2019-08-23 | 平煤神马建工集团有限公司 | A kind of tool-type elevator steel operating platform |
| CN113863647A (en) * | 2021-11-11 | 2021-12-31 | 中建科技集团有限公司 | Self-lifting elevator shaft protection operation platform suitable for multiple calibers |
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| CN101624871A (en) * | 2009-07-08 | 2010-01-13 | 山东新城建工股份有限公司 | Instrumental operation platform for shear wall formwork of elevator shaft |
| CN202090578U (en) * | 2011-05-13 | 2011-12-28 | 浙江城建建设集团有限公司 | Shaped elevator shaft construction operating platform device |
| CN202401738U (en) * | 2011-12-09 | 2012-08-29 | 中建四局第六建筑工程有限公司 | Operating platform for supporting assembled elevator shaft shear wall framework |
| CN203891443U (en) * | 2014-05-14 | 2014-10-22 | 福建建工集团总公司 | Shear wall elevator shaftway assembly type operation platform |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101624871A (en) * | 2009-07-08 | 2010-01-13 | 山东新城建工股份有限公司 | Instrumental operation platform for shear wall formwork of elevator shaft |
| CN202090578U (en) * | 2011-05-13 | 2011-12-28 | 浙江城建建设集团有限公司 | Shaped elevator shaft construction operating platform device |
| CN202401738U (en) * | 2011-12-09 | 2012-08-29 | 中建四局第六建筑工程有限公司 | Operating platform for supporting assembled elevator shaft shear wall framework |
| CN203891443U (en) * | 2014-05-14 | 2014-10-22 | 福建建工集团总公司 | Shear wall elevator shaftway assembly type operation platform |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110005183A (en) * | 2019-04-22 | 2019-07-12 | 上海建工一建集团有限公司 | Elevator shaft promotes platform |
| CN110158935A (en) * | 2019-05-07 | 2019-08-23 | 平煤神马建工集团有限公司 | A kind of tool-type elevator steel operating platform |
| CN113863647A (en) * | 2021-11-11 | 2021-12-31 | 中建科技集团有限公司 | Self-lifting elevator shaft protection operation platform suitable for multiple calibers |
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Application publication date: 20190312 |