CN109972849A - Inside and outside self-stabilising in sliding type electric stair shaft safety device construction method - Google Patents
Inside and outside self-stabilising in sliding type electric stair shaft safety device construction method Download PDFInfo
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- CN109972849A CN109972849A CN201910329246.6A CN201910329246A CN109972849A CN 109972849 A CN109972849 A CN 109972849A CN 201910329246 A CN201910329246 A CN 201910329246A CN 109972849 A CN109972849 A CN 109972849A
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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
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/32—Safety or protective measures for persons during the construction of buildings
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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
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/32—Safety or protective measures for persons during the construction of buildings
- E04G21/3204—Safety or protective measures for persons during the construction of buildings against falling down
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- Architecture (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
Abstract
The present invention relates to the construction methods of safety device in sliding type electric stair shaft inside and outside a kind of self-stabilising, it is characterized by: it includes suspension scaffold, sliding platform and protection mechanism, suspension scaffold includes girder, secondary beam, limit beam, vertical bar and crossbeam, vertical bar is equipped with leveling steel plate, sliding platform includes main frame, side frame, main steel plate and side steel plate, protection mechanism includes linked network screw rod and safety net, and method includes that Cantilever Beams assembling and on-site hoisting, the adjustment of leveling steel plate, sliding platform fit and slide into elevator, linked network screw rod and safety net installation.Structure of the invention self-stability is strong, operation is less in well and working security is good, the high, peace that is used in turn rate is torn open quickly and environmental protection and energy saving is good, it overcomes conventional embedded steel tube guard technology complex procedures and field operation amount is big, pacifies and tears the problems such as dangerous, recycling rate of waterused is low, construction speed is slow open, have significant economic benefit and social benefit.
Description
Technical field
The present invention relates to the construction methods of safety device in sliding type electric stair shaft inside and outside a kind of self-stabilising, belong to building
Engineering field, suitable for the security protection in elevator.
Background technique
In recent years, with the high speed development of China's town and country construction, construction market scale constantly expands, and high-rise, Super High is built
It builds more and more common.During high-building construction, the protection of elevator well opening is the emphasis of construction site security protection,
It is the district occurred frequently of high falling safety accident.The Normal practice of construction site is at present: elevator opening buries horizontal steel tube, face paving
Scaffold board or plank sheathing are closed as hard plane, and upper end re-lays 1 layer of horizontal blanket net.When the Normal practice is implemented, there is steel
Pipe leakiness buries, safe blanket net does not fix hanging point, needs to beat expansion bolt to fix blanket net, and the recycling of steel pipe, template
The problems such as relatively complicated.Simultaneously as process is tedious, Comparision danger is removed in installation, and there are many security risks.
Therefore, in order to effectively solve the above problems, urgent need designs one kind and is easily installed, can be used in turn, working security
Safety device in high elevator.
Summary of the invention
It is an object of the invention to be directed to, traditional embedded steel tube guard technology complex procedures and field operation amount are big, pacify and tear danger open
Danger, the problems such as recycling rate of waterused is low, construction speed is slow propose inside and outside a kind of self-stabilising security protection dress in sliding type electric stair shaft
It sets.
In order to achieve the above technical purposes, the invention adopts the following technical scheme:
Inside and outside a kind of self-stabilising of the present invention in sliding type electric stair shaft safety device construction method, including with
Lower step:
Step 1, installation girder, limit beam, secondary beam, vertical bar, crossbeam and diagonal brace, forms suspension scaffold, girder exterior portion frame
On the floor outside elevator, inboard portion overhangs inside elevator, and inner opposite end withstands elevator inner wall, and limit beam is tight
Paste elevator inner wall；
The leveling steel plate on vertical bar top is installed and adjusted to step 2, holds out against leveling steel plate in elevator outer wall；
The main frame being superimposed together and side frame are mounted on girder and are located at the upper of elevator exterior section by step 3
Side forms sliding platform, pushes sliding platform from outside to inside, slides into it integrally in elevator, and side frame is unfolded；
Step 4, side frame top is located at four corner locations inside elevator and installs linked network screw rod, by the four of safety net
It is fixed on the top of linked network screw rod week, forms protection mechanism；
Step 5, with steel wire rope drawknot girder inner end and crossbeam；
Step 6 after construction, releases wirerope, removes safety net and remove linked network screw rod, overlaps sliding platform, will
Sliding platform slides on the outside of elevator and recycles along girder, removes linkage levelling screw and leveling steel plate, and suspension scaffold is taken out electricity
Stair shaft simultaneously recycles.
Preferably, in the step 2, the top of vertical bar is previously provided with threaded sleeve, and the inside of threaded sleeve is furnished with
Linkage levelling screw, linkage levelling screw are equipped with handle far from one end of elevator outer wall, level Interal fixation in linkage levelling screw close to elevator
One end of well outer wall, changes the position of leveling steel plate by way of handle clockwise or counterclockwise, and then makes to level steel
Plate is held out against in elevator outer wall.
Preferably, the first steel loop is previously provided on crossbeam, girder inner opposite end is previously provided with the second steel loop, sliding in step 3
Before moving platform slides into elevator inside, first one end of wirerope is connected on the second steel loop, forms protection mechanism in step 4
Afterwards, the other end of wirerope is connected on the first steel loop, realizes the drawknot of girder and crossbeam.
Preferably, stupefied equipped with the master perpendicular to girder inside the main frame, main stupefied top is laid with main steel plate, under master is stupefied
Edge middle section is equipped with protrusion, the side block for being parallel to girder is equipped with below main frame, side block and male cooperation form sliding slot, main
Frame is slidably connected by sliding slot and girder.
Preferably, the width of sliding slot and girder is of same size.
Preferably, the side frame in the step 3 is hinged with main frame by hinge, the main frame that is superimposed together with
After side frame slides into elevator, side frame, side stupefied upper laying side steel stupefied equipped with side inside side frame are unfolded by way of overturning
Plate.
Preferably, the position that the top of side frame is located at four corners of elevator is equipped with sleeve, in step 4, linked network screw rod
Sleeve is inserted into bottom end, and is fixed by way of tightening.
Preferably, the outermost end of main frame is equipped with the first ear beam, and main frame is equipped with the second ear close to elevator outer wall position
Beam, vertical bar are fixed on the second ear beam, and the bottom end of diagonal brace is fixed with the first ear beam, fixed at the top of top and vertical bar.
Preferably, the width of main frame and elevator elevator door opening is of same size, after two sides side frame is fully deployed,
Of same size, the length of length and elevator inner space of side frame and the overall width of main frame and elevator inner space
It is identical.
The invention has the characteristics that and the utility model has the advantages that
(1) suspension scaffold is held out against by leveling bolt in elevator outer wall, and is realized by diagonal brace and wirerope " from steady ", is prevented
The installation of protection unit is more secured, construction quality is more secure.
(2) sliding platform ensure that the steady of slipping through the stupefied snap-in of master of side block and lower lobes above girder
It is qualitative, while the sliding platform of closed state can be installed on the outside of elevator and elapse in place, the traditional embedded steel tube of comparison
Guard technology avoids operation in a large amount of well, improves the safety of construction.
(3) suspension scaffold can be held out against by leveling bolt, the operation such as embedded and fixation without built-in fitting；Sliding platform can
With overlapping, transport and peace tear open it is more convenient；Safety net is hung on the linked network screw rod being screwed in sleeve, is eliminated and is beaten expanding screw
The process of the fixed blanket net of bolt, effectively saves the duration.
(4) sliding platform, suspension scaffold are prefabricated in the factory, it is only necessary to which transport to scene install and can recycle again sharp
With site workload can be effectively reduced, and environmental protection and energy saving is more preferable.
Detailed description of the invention
Fig. 1 is safety device sectional view in sliding type electric stair shaft inside and outside self-stabilising；
Fig. 2 is safety device Section A-A figure in sliding type electric stair shaft inside and outside 1 self-stabilising of attached drawing；
Fig. 3 is safety device section B-B figure in sliding type electric stair shaft inside and outside 2 self-stabilising of attached drawing；
Fig. 4 is leveling bolt installation connection detail；
Fig. 5 is installation suspension scaffold schematic diagram；
Fig. 6 is fixed suspension scaffold schematic diagram；
Fig. 7 is mounting slip platform and sliding in place schematic diagram；
Fig. 8 is installation linked network screw rod schematic diagram；
Fig. 9 is to be laid with safety net schematic diagram；
Figure 10 is drawknot wirerope schematic diagram；
In figure: 1. girders, 2. secondary beams, 3. limit beams, 4. diagonal braces, 5. vertical bars, 6. crossbeams, 7. main stupefied, 8. main steel plates, 9. sets
Cylinder, 10. linked network screw rods, 11. wirerope, 12. safety nets, 13. leveling steel plates, 14. linkage levelling screws, 15. first steel loops, 16. sides
Steel plate, 17. sides are stupefied, 18. hinges, 19. grooves, 20. side frames, 21. main frames, 22. side blocks, 23. first ear beams, 24. band spiral shells
Line sleeve, 25. handles, 26. protrusions, 27. second steel loops, 28. first ear beams.
Specific embodiment
Invention is further described in detail with reference to the accompanying drawing and by embodiment, and following embodiment is to the present invention
Explanation be not limited to following embodiment.
The present embodiment is by taking certain high-building construction as an example, building storey high 3.6m, lift shaft dimensions 2.2m × 2.1m, elevator door
Dimension of opening 1.1m × 2.1m uses sliding type electric stair shaft inside and outside self-stabilising of the present invention in the work progress of elevator
Interior safety device.
As shown in Figure 1, safety device in sliding type electric stair shaft inside and outside a kind of self-stabilising of the present invention, including packet
Include suspension scaffold, sliding platform and protection mechanism.
In conjunction with shown in attached Fig. 1 and 2, the suspension scaffold includes girder 1, secondary beam 2, limit beam 3, vertical bar 5 and crossbeam 6, master
Beam 1 and diagonal brace 4 are 200 × 100 × 10mm I-steel, and girder 1 is 4.2m long, and vertical bar 5, crossbeam 6, secondary beam 2, limit beam 3 are
180 × 180 × 10mm square steel, vertical bar 5 is 3m high, and crossbeam 6 and secondary beam 2 are 0.8m long, and limit beam 3 is 1m long.1 both ends of girder are located at
Outwardly and inwardly, secondary beam 2 is arranged at intervals between girder 1 elevator, and limit beam 3 is located at 1 lower surface of girder, and in elevator
Wall is close to, wherein secondary beam 2 and limit beam 3 near elevator inner wall are in upper and lower corresponding relationship.The thickness and girder 1 of secondary beam 2
Web height it is corresponding, the both ends of secondary beam 2 and the web of two sides girder 1 are welded to connect.The outermost end of main frame 21 is equipped with the
One ear beam 23, main frame 21 are equipped with the second ear beam 28 close to elevator outer wall position, and the first ear beam 23 and the second ear beam 28 are
180 × 180 × 10mm square steel, length 0.23m, 5 bottom end of vertical bar are welded on the second ear beam 28, and 5 top of vertical bar passes through diagonal brace 4
It is supported with 1 outboard end of girder, the bottom end of diagonal brace 4 and the first ear beam 23 weld.In conjunction with shown in attached drawing 4, the top of vertical bar 5 is equipped with band
Screw shell 24, with linkage levelling screw 14 is arranged with inside threaded sleeve 24,14 both ends of linkage levelling screw are respectively equipped with 25 He of handle
Steel plate 13 is leveled, handle 25 is used to rotate linkage levelling screw 14 and then adjust the position of leveling steel plate 13, and leveling steel plate 13 has adjusted
At rear abutting elevator outer wall, crossbeam 6 is fixed between two vertical bars 5, and 6 both ends of crossbeam are equipped with the first steel loop 15, and 1 inner end of girder is set
There is the second steel loop 27, the quantity of the second steel loop 27 is identical as the quantity of the first steel loop 15, is two in the present embodiment, and position
It is corresponding, crossbeam 6 by wirerope 11 and 1 inner end drawknot of girder, the both ends of wirerope 11 respectively with corresponding first steel loop 15
And second steel loop 27 connect.Above-mentioned diagonal brace 4 and wirerope 11 play the role of guaranteeing suspension scaffold globality, make suspension scaffold knot
Structure is more stable.
In conjunction with shown in attached drawing 1~3, the sliding platform includes main frame 21, side frame 20, main steel plate 8 and side steel plate
16, main frame 21 and side frame 20 are all made of 50 × 50 × 10mm square steel, size be respectively 1.1m × 2.1m and 0.55m ×
2.1m, main frame 21 are slidably connected with girder 1, and the master stupefied 7 perpendicular to girder 1 is equipped with inside main frame 21, and side frame 20 is symmetrical
Setting is in 21 left and right sides of main frame and passes through hinge 18 and main frame 21 hingedly, is equipped with inside side frame 20 perpendicular to girder 1
Side stupefied 17, square steel of the side stupefied 17 using 40 × 50 × 10mm, length 0.45m, main steel plate 8 is laid on main stupefied 7, side steel plate
16 are laid on side stupefied 17；The position for being located at four corners inside elevator above the side frame 20 is equipped with sleeve 9.In conjunction with
Shown in attached drawing 3, main stupefied 7 use 40 × 60 × 10mm square steel of 40 × 50 × 10mm square steel and one section of long 0.8m of two sections of long 0.1m
It is welded, and then is equipped with protrusion 26 in middle section, be equipped with the side block 22 for being parallel to girder 1, side block 22 below main frame 21
Using the square steel of 50 × 50 × 10mm, length 2100mm, side block 22 and protrusion 26 cooperatively form sliding slot, the width and girder of sliding slot
1 it is of same size, main frame 21 is slidably connected by sliding slot with girder 1.21 inside edge of main frame is equipped with and second
The one-to-one groove 19 of 27 equivalent of steel loop and position, when main frame 21 slide into elevator inside when, the second steel loop 27 be located at pair
In the groove 19 answered, it can so prevent main frame 21 and the second steel loop 27 from colliding and main frame 21 or the second steel loop 27 is caused to damage
It is bad.The highest point of second steel loop 27 is flushed with the top surface of main frame 21, guarantees 21 surfacing of main frame.
In conjunction with shown in attached drawing 1 and 3, the protection mechanism includes linked network screw rod 10 and safety net 12,10 cloth of linked network screw rod
Four corners in side frame 20 and being located inside elevator are set, the bottom of linked network screw rod 10 is inserted into corresponding sleeve 9, peace
The surrounding of the whole network 12 is fixed on 10 top of linked network screw rod.
Using the construction method of safety device in sliding type electric stair shaft inside and outside above-mentioned self-stabilising are as follows:
Step 1, factory install girder 1, limit beam 3, secondary beam 2, vertical bar 5, crossbeam 6 and diagonal brace 4, form suspension scaffold, in conjunction with
Shown in attached drawing 5, suspension scaffold is hung in into elevator position, makes 1 exterior portion frame of girder on the floor outside elevator, inside portion
Divide overhanging inside elevator, inner opposite end withstands elevator inner wall, and limit beam 3 is close to elevator inner wall, wherein vertical bar 5
Top presets threaded sleeve 24, and the first steel loop 15 is previously provided on crossbeam 6, and 1 inner opposite end of girder is previously provided with second
Steel loop 27；
The leveling steel plate 13 on 5 top of vertical bar is installed and adjusted to step 2, i.e., in threaded sleeve 24 as shown in Fig. 6
Inside installation linkage levelling screw 14, linkage levelling screw 14 are screwed into handle 25 far from one end of elevator outer wall, and linkage levelling screw 14 is close to electricity
One end of stair shaft outer wall is screwed into leveling steel plate 13, changes leveling steel plate 13 by way of handle 25 clockwise or counterclockwise
Position, and then make level steel plate 13 hold out against in elevator outer wall；
The main frame 21 being superimposed together and side frame 20 are mounted on girder 1 and are located at electricity by step 3 as shown in Fig. 7
The top of stair shaft exterior section forms sliding platform, and the sliding slot of 21 lower section of main frame is just engaged with girder 1, and sliding platform is only
It inside and outside can slide, offset, the width of main frame 21 and of same size, the sliding platform cunning of elevator elevator door opening cannot be controlled
Before entering elevator inside, first one end of wirerope 11 is connected on the second steel loop 27, then pushes sliding platform from outside to inside,
It slides into it integrally in elevator, side frame 20 is unfolded by way of overturning, after two sides side frame 20 is fully deployed, side frame
20 and main frame 21 overall width and of same size, the length phase of length and elevator inner space of elevator inner space
Together, the position that the top of side frame 20 is located at four corners of elevator pre-sets sleeve 9；
Step 4 is located at four corner locations inside elevator as shown in figs. 8 and 9, above side frame 20 and installs linked network
Screw rod 10, sleeve 9 is inserted into 10 bottom end of linked network screw rod, and is fixed by way of tightening, and the surrounding of safety net 12 is fixed on extension
Protection mechanism is formed on the top of net screw rod 10；
The other end of wirerope 11 is connected on the first steel loop 15 by step 5 as shown in Fig. 10, by girder 1 and cross
The drawknot of beam 6 is together.
Step 6 after construction, releases wirerope 11, removes safety net 12 and remove linked network screw rod 10, overlapping sliding
Sliding platform is slid on the outside of elevator and is recycled along girder 1, removes linkage levelling screw 14 and leveling steel plate 13 by platform, will
Suspension scaffold takes out elevator and recycles.
It describes the invention in detail in conjunction with the embodiments above, but the content is only preferable implementation of the invention
Example, should not be considered as limiting the scope of the invention.It is all according to all the changes and improvements made by the present patent application range
Deng should all still fall within patent covering scope of the invention.
Claims (9)
1. inside and outside a kind of self-stabilising in sliding type electric stair shaft safety device construction method, which is characterized in that including following
Step:
Step 1, installation girder (1), limit beam (3), secondary beam (2), vertical bar (5), crossbeam (6) and diagonal brace (4), forms suspension scaffold,
Girder (1) exterior portion frame is on the floor outside elevator, and inboard portion overhangs inside elevator, and inner opposite end withstands electricity
Elevator inner wall is close in stair shaft inner wall, limit beam (3)；
The leveling steel plate (13) on vertical bar (5) top is installed and adjusted to step 2, holds out against leveling steel plate (13) in outside elevator
Wall；
The main frame being superimposed together (21) and side frame (20) are mounted on girder (1) and are located at elevator outside portion by step 3
The top divided forms sliding platform, pushes sliding platform from outside to inside, slides into it integrally in elevator, and side frame is unfolded
(20)；
Step 4, side frame (20) top is located at four corner locations installations linked network screw rod (10) inside elevator, by safety net
(12) surrounding is fixed on the top of linked network screw rod (10), forms protection mechanism；
Step 5, with wirerope (11) drawknot girder (1) inner end and crossbeam (6)；
Step 6 after construction, releases wirerope (11), removes safety net (12) and remove linked network screw rod (10), and overlapping is slided
Platform is moved, sliding platform is slid on the outside of elevator and recycled along girder (1), linkage levelling screw (14) and leveling steel plate are removed
(13), suspension scaffold is taken out into elevator and recycled.
2. inside and outside self-stabilising according to claim 1 in sliding type electric stair shaft safety device construction method, it is special
Sign is: in the step 2, the top of vertical bar (5) is previously provided with threaded sleeve (24), the inside of threaded sleeve (24)
Equipped with linkage levelling screw (14), linkage levelling screw (14) is equipped with handle (25) far from one end of elevator outer wall, and leveling steel plate (13) is solid
It is scheduled on the one end of linkage levelling screw (14) close to elevator outer wall, is changed by way of handle clockwise or counterclockwise (25)
The position of steel plate (13) is leveled, and then holds out against leveling steel plate (13) in elevator outer wall.
3. inside and outside self-stabilising according to claim 1 in sliding type electric stair shaft safety device construction method, it is special
Sign is: being previously provided on crossbeam (6) the first steel loop (15), girder (1) inner opposite end is previously provided with the second steel loop (27), in step
Before rapid three sliding platform slides into elevator inside, first one end of wirerope (11) is connected on the second steel loop (27), in step
After four form protection mechanism, the other end of wirerope (11) is connected on the first steel loop (15), realizes girder (1) and crossbeam
(6) drawknot.
4. inside and outside self-stabilising according to claim 1 in sliding type electric stair shaft safety device construction method, it is special
Sign is: it is stupefied (7) equipped with the master perpendicular to girder (1) inside the main frame (21), main steel plate is laid with above main stupefied (7)
(8), main stupefied (7) lower edge middle section is equipped with raised (26), and the side block for being parallel to girder (1) is equipped with below main frame (21)
(22), side block (22) and raised (26) cooperatively form sliding slot, and main frame (21) is slidably connected by sliding slot with girder (1).
5. inside and outside self-stabilising according to claim 4 in sliding type electric stair shaft safety device construction method, it is special
Sign is: the width of sliding slot is of same size with girder (1).
6. inside and outside self-stabilising according to claim 1 in sliding type electric stair shaft safety device construction method, it is special
Sign is: the side frame (20) in the step 3 passes through hinge (18) and main frame (21) hingedly, the main frame being superimposed together
After frame (21) and side frame (20) slide into elevator, it is unfolded by way of overturning side frame (20), is set inside side frame (20)
Have that side is stupefied (17), is laid with side steel plate (16) on side stupefied (17).
7. inside and outside self-stabilising according to claim 1 in sliding type electric stair shaft safety device construction method, it is special
Sign is: the position that the top of side frame (20) is located at four corners of elevator is equipped with sleeve (9), in step 4, linked network screw rod
(10) bottom end insertion sleeve (9), and fixed by way of tightening.
8. inside and outside self-stabilising according to claim 1 in sliding type electric stair shaft safety device construction method, it is special
Sign is: the outermost end of main frame (21) is equipped with the first ear beam (23), and main frame (21) is equipped with the close to elevator outer wall position
Two ear beams (28), vertical bar (5) are fixed on the second ear beam (28), and the bottom end of diagonal brace (4) and the first ear beam (23) are fixed, top with
It is fixed at the top of vertical bar (5).
9. inside and outside self-stabilising according to claim 1 in sliding type electric stair shaft safety device construction method, it is special
Sign is: the width of main frame (21) is of same size with elevator elevator door opening, after two sides side frame (20) is fully deployed,
Of same size, the sky inside length and elevator of side frame (20) and the overall width of main frame (21) and elevator inner space
Between length it is identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910329246.6A CN109972849A (en) | 2019-04-23 | 2019-04-23 | Inside and outside self-stabilising in sliding type electric stair shaft safety device construction method |
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| CN201910329246.6A CN109972849A (en) | 2019-04-23 | 2019-04-23 | Inside and outside self-stabilising in sliding type electric stair shaft safety device construction method |
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| CN110374317A (en) * | 2019-07-31 | 2019-10-25 | 杭州昂创科技有限公司 | The construction method of hole part liftable discharging platform |
| CN111362097A (en) * | 2020-03-25 | 2020-07-03 | 上海菱光电梯配件有限公司 | Assembling structure of elevator accessory |
| CN111576900A (en) * | 2020-04-23 | 2020-08-25 | 张达芬 | Safety protection device for building construction |
| CN114575609A (en) * | 2022-02-28 | 2022-06-03 | 中核华辰建筑工程有限公司 | Indoor construction elevator well top sealing tool |
| CN116145936A (en) * | 2023-02-27 | 2023-05-23 | 中国十九冶集团有限公司 | Assembled construction platform for elevator installation and installation method |
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| CN111362097A (en) * | 2020-03-25 | 2020-07-03 | 上海菱光电梯配件有限公司 | Assembling structure of elevator accessory |
| CN111576900A (en) * | 2020-04-23 | 2020-08-25 | 张达芬 | Safety protection device for building construction |
| CN114575609A (en) * | 2022-02-28 | 2022-06-03 | 中核华辰建筑工程有限公司 | Indoor construction elevator well top sealing tool |
| CN116145936A (en) * | 2023-02-27 | 2023-05-23 | 中国十九冶集团有限公司 | Assembled construction platform for elevator installation and installation method |
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Application publication date: 20190705 |