CN116065773A - Subsection translation installation method for lower rotary steel ladder of building cover with limited structure - Google Patents

Subsection translation installation method for lower rotary steel ladder of building cover with limited structure Download PDF

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Publication number
CN116065773A
CN116065773A CN202310053016.8A CN202310053016A CN116065773A CN 116065773 A CN116065773 A CN 116065773A CN 202310053016 A CN202310053016 A CN 202310053016A CN 116065773 A CN116065773 A CN 116065773A
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CN
China
Prior art keywords
ladder
rotary steel
steel ladder
floor
section
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310053016.8A
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Chinese (zh)
Inventor
纪思行
黎映呈
张连魁
齐磊
吴宝朋
曹宇航
望欣垚
高明
贾梓鹤
王世豪
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China Construction Eighth Engineering Division Co Ltd
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China Construction Eighth Engineering Division Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China Construction Eighth Engineering Division Co Ltd filed Critical China Construction Eighth Engineering Division Co Ltd
Priority to CN202310053016.8A priority Critical patent/CN116065773A/en
Publication of CN116065773A publication Critical patent/CN116065773A/en
Pending legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F11/00—Stairways, ramps, or like structures; Balustrades; Handrails
    • E04F11/02—Stairways; Layouts thereof
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F21/00—Implements for finishing work on buildings
    • E04F21/26—Implements for finishing work on buildings for mounting staircases, e.g. tools for marking steps
    • 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
    • E04G21/14—Conveying or assembling building elements
    • E04G21/16—Tools or apparatus
    • 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
    • E04G21/14—Conveying or assembling building elements
    • E04G21/16—Tools or apparatus
    • E04G21/162—Handles to carry construction blocks
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F11/00—Stairways, ramps, or like structures; Balustrades; Handrails
    • E04F11/02—Stairways; Layouts thereof
    • E04F2011/0203—Miscellaneous features of stairways not otherwise provided for
    • E04F2011/0205—Stairways characterised by the use of specific materials for the supporting structure of the treads
    • E04F2011/0209—Stairways characterised by the use of specific materials for the supporting structure of the treads mainly of metal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/20—Hydro energy

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Ladders (AREA)

Abstract

The invention discloses a subsection translation installation method for a lower rotary steel ladder of a floor system with a limited structure, which comprises the following steps: installing a protective railing and a hanging bracket according to the design position of the rotary steel ladder; a vertical adjusting block is fixedly arranged on the hanging bracket, and a horizontal adjusting block is fixedly arranged on the main building layer high plate surface corresponding to each ladder section; segmenting the rotary steel ladder according to the design, and sequentially hoisting the first layer and the ladder section of the middle layer from bottom to top along the height direction of the rotary steel ladder by adopting a tower crane in combination with a vertical adjusting block and a horizontal adjusting block; after the first layer and the middle layer bench are installed, the last running section and the first running section of the top layer are respectively installed, after the installation is completed, the middle running section of the top layer is vertically hoisted by adopting a tower crane and is fixedly connected with the first running section and the last running section respectively.

Description

Subsection translation installation method for lower rotary steel ladder of building cover with limited structure
Technical Field
The invention relates to the technical field of building construction, in particular to a subsection translation installation method for a lower rotary steel ladder of a building cover with a limited structure.
Background
Along with the demand of time development, the steps of urban construction are also gradually accelerated, and further the development of the building industry is greatly influenced, more and more public buildings are more and more beautiful in shape, and in order to keep the overall aesthetic property and harmony of projects, the characteristics of large flow of people in public places are considered, and the indoor pedestrian passageway adopts a steel structure rotary stair which is attractive in shape, high in bearing capacity, light in weight and capable of being installed rapidly.
The steel structure rotary stair belongs to a special-shaped space structure, meanwhile, factors such as manufacturing, transportation and installation of the steel structure rotary stair are considered, the steel structure rotary stair needs to be manufactured in sections, when the rotary steel stair cannot be vertically hoisted under the influence of an upper floor, and under the condition that a support frame body is required to be erected at the bottom to temporarily install and fix the steel stair, the technical difficulty of construction cannot be solved in the prior art, and therefore a method for installing the rotary steel stair under a limited structure floor in a sectional translation mode is needed.
Disclosure of Invention
In order to overcome the defects of the center in the prior art, the invention provides a method for installing the rotary steel ladder in a sectional translation way under the floor of a limited structure, when the rotary steel ladder is hoisted under the influence of the floor of the structure and cannot be hoisted vertically, the rotary steel ladder is installed in a sectional oblique translation way in place by utilizing the matching hoisting of a horizontal adjusting and vertical adjusting hoist, so that the rotary steel ladder is installed in place, the installation construction flow is quickened, and the installation period is shortened.
In order to achieve the above purpose, the invention provides a method for installing a rotary steel ladder under a limited structure floor in a subsection translation manner, which comprises the following steps:
in the civil engineering construction process, temporary protective rails are installed on two sides of a design position according to the design position of a rotary steel ladder, and hanging frames are fixedly installed on the top layer structure plate surface where the rotary steel ladder is located and on a first stair turning section from top to bottom along the height direction of the rotary steel ladder respectively;
after the hanging frame is installed, a vertical adjusting block is fixedly installed on the hanging frame, and a horizontal adjusting block for obliquely pulling the ladder section to be in place and fixing is fixedly installed on the corresponding floor surface of each ladder section;
segmenting the rotary steel ladder according to the design, and sequentially hoisting the first layer and the ladder section of the middle layer from bottom to top along the height direction of the rotary steel ladder by adopting a tower crane and matching with a vertical adjusting block and a horizontal adjusting block;
after the first layer and the middle layer bench are installed, the last running section and the first running section of the top layer are installed respectively, and after the installation is completed, the middle running section of the top layer is vertically hoisted by adopting a tower crane and is fixedly connected with the first running section and the last running section respectively.
Preferably, the hanging bracket comprises I-steel fixedly installed on one side, far away from the structural plate surface, of the structural plate surface, and two vertical adjusting blocks which are respectively fixed and hung on two ends of the I-steel along the length direction through steel wires.
Preferably, the back sill Liang Yuanli is characterized in that a buried plate is fixedly arranged on one side of the structural plate surface, the I-steel is fixedly welded with the buried plate, two hanging lifting lugs are fixedly arranged on the I-steel respectively corresponding to the two vertical adjusting hoists, and the vertical adjusting hoists are connected with the hanging lifting lugs through steel wires.
Preferably, the installation hanging plate is fixedly installed on the beam of the ladder section of the starting end of the rotary steel ladder, the adjusting lug plate is fixedly installed on the structural beam of the corresponding floor in the main building, round holes are correspondingly formed in the installation hanging plate and the adjusting lug plate, and bolts for fixedly connecting the ladder section of the starting end of the rotary steel ladder with the structural beam are inserted into the round holes.
Preferably, two ends of the horizontal adjusting block are respectively fixedly connected with the installation bench of the rotary steel ladder and the main building floor structure plate surface corresponding to the installation bench.
And two ends of the vertical adjusting block are fixedly connected with the hanging bracket and the installation bench of the rotary steel ladder respectively.
Preferably, a rocker is fixedly arranged on one side of the second sprocket away from the connecting shaft.
By adopting the technical scheme, the invention has the following beneficial effects:
1) The technical problem that a rotating steel ladder cannot be installed under a floor with a limited structure is solved.
2) The lower part of the rotary steel ladder does not need to be provided with a full-hall support frame body, and the upper section is temporarily installed and fixed through the chain block, so that the investment of measure cost is saved.
3) The installation and construction process is quickened, and the installation period is shortened.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a three-dimensional model of a rotary steel ladder used in a method for mounting the rotary steel ladder under a floor system with a limited structure in a sectional translation manner.
Fig. 2 is a schematic diagram of the planar positional relationship between a rotating steel ladder and a structural floor slab in the method for mounting the rotating steel ladder under a limited structural floor slab in a subsection translation manner.
FIG. 3 is a plan view of a hanger for use in the method of segmental translational installation of a rotating steel ladder under a confined structure floor of the present invention.
Fig. 4 is a cross-sectional view of the hanger of fig. 3.
Fig. 5 is a schematic diagram of the installation of the lower node of the starting end bench of the 6-7 floors in the method for installing the lower rotary steel ladder of the floor with the limited structure in a sectional translation manner.
Fig. 6 is a schematic diagram of the position of the chain block when the invention is used for installing the 6-7 first running sections in the method for installing the rotary steel ladder under the floor with the limited structure in a sectional translation way.
Fig. 7 is a schematic diagram of the position of the chain block when the 7-8 first running sections are installed in the method for installing the rotary steel ladder under the floor with the limited structure in a sectional translation manner.
Fig. 8 is a schematic diagram of the position of the chain block when the 8-9 first running sections are installed in the method for installing the rotary steel ladder under the floor with the limited structure in a sectional translation manner.
The reference numbers in the drawings correspond to the following:
1-rotating a steel ladder; 2-rotating the outer edge of the steel ladder; 3-9 floors of floor hole edge lines; 4-hanging bracket; 5-tower crane; 6-main building 6-layer structure plate; 7-main building 7-layer structural panels; 8-main building 8-layer structure plate; 9-main building 9-storey structural panels; 10-burying a plate; 11-vertical adjustment of the hoist; 12-horizontally adjusting the hoist; 13-hanging lifting lugs; 14-a steel wire rope; 15-a back ridge beam; 16-structural panel; 17-mounting a hanging plate; 18-round holes; 19-adjusting the ear plate; 20-structural beams; 21-an initial end bench; 22-I-steel.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings. The description of these embodiments is provided to assist understanding of the present invention, but is not intended to limit the present invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
The invention aims to solve the technical problems that aiming at the existing installation mode of the rotary steel ladder, when the rotary steel ladder is under the floor with a limited structure, the rotary steel ladder cannot be vertically hoisted under the influence of the floor with an upper layer, the rotary steel ladder is temporarily installed and fixed at the bottom by erecting a support frame body, and the hoisting construction requirement cannot be met.
Referring to fig. 1-8, in a certain project, a rotary steel ladder 1 is located in 6-9 layers of an axial region of K-F-K-E, where reference numerals 6, 7, 8, 9 in fig. 1 represent a main building 6-layer structural plate, a main building 7-layer structural plate, a main building 8-layer structural plate, and a main building 9-layer structural plate where the rotary steel ladder 1 is located, respectively, an outer diameter of the rotary steel ladder 1 is 6.5m, an inner diameter is 4.9m, a height is 15.094m, the whole rotary steel ladder 1 is divided into 7 running, 6 rest platforms are 6 running, 6-7 running, 7-8 running, 8-9 running, a box-shaped section is 8-9 running, a main section of a ladder beam is 500×300 (width×height), H-shaped steel beams are embedded in each layer of the laminate surfaces of the 6, 7, 8, and 9 layers as support nodes of the whole rotary steel ladder 1, 9 layers of the top of the rotary steel ladder 1 are arranged, and at the same time, the inner side edges of the rotary steel ladder 1 are outside the structure, as shown in the figure 2.
Referring to fig. 1 to 8, the invention provides a method for installing a rotary steel ladder under a limited structure floor in a sectional translation manner, which comprises the following steps:
1) Mounting preparation and setting hanger
(1) In the civil engineering construction process, according to the design position of rotatory steel ladder 1, install the interim guard rail in stair both sides before all stair bench installations, railing height 1.2m, the pole setting adopts phi 48 to be 3 the steel pipe, interval 600mm sets up two horizontal poles, and the horizontal pole adopts 10-20mm round steel or reinforcing bar.
(2) According to the installation sequence of the rotary steel ladder 1, the hanging frame 4 is fixedly installed on the top layer structural plate surface where the rotary steel ladder 1 is located and on the first rotating ladder section from top to bottom along the height direction of the rotary steel ladder 1, it is to be noted that the hanging frame 4 is considered to be arranged on the main building 9 layer structural plate 9 surface from top to bottom in two parts, in addition, the hanging frame 4 is directly welded and suspended on the stairs on the first rotation to carry out hoist hanging, preferably, the hanging frame 4 comprises I-steel 22 fixedly installed on one side of a structural plate surface 16, which is far away from the structural plate surface 16, of a reverse sill beam 15, a buried plate 10 is fixedly installed on one side of the reverse sill beam 15, the buried plate 10 is fixed after the steel is planted by adopting a chemical anchor bolt with the diameter of 16mm, and the I-steel 22 and the buried plate are welded and fixed.
(3) After the hanging bracket 4 is installed, the vertical adjusting hoist 11 is fixedly installed on the hanging bracket 4, and meanwhile, the horizontal adjusting hoist 12 is fixedly installed on the main building floor height plate surface corresponding to each installation bench, preferably, two ends of the vertical adjusting hoist are fixedly connected with the hanging bracket 4 and the installation bench of the rotating steel ladder to be installed respectively, two ends of the horizontal adjusting hoist 12 are fixedly connected with the installation bench of the rotating steel ladder 1 and the main building floor structure plate surface corresponding to the installation bench respectively, the weights of the vertical adjusting hoist 11 and the horizontal adjusting hoist 12 are 5 tons, the horizontal adjusting hoist 12 is used for adjusting the levelness of the installation bench, and meanwhile, a main rope with the length of 12m is used as an oblique pull rope to pull the installation bench to be in position, and it is required to be noted that two vertical adjusting hoists 11 are hung and fixed on two ends of the I-steel 22 along the length direction through steel ropes 14 with the diameter of 18mm respectively, two hanging hooks 13 are fixedly installed on the I-steel 22 corresponding to the two vertical adjusting hoists 11 respectively, and the vertical adjusting hoist 11 are connected with the hanging hooks 13 through the hanging hooks 14.
2) Installing 6-7 layers of first running
(1) Two steel wire ropes with the diameter of 18mm and the length of 6m are connected at the upper and lower two positions of the outer ring of the installation bench before lifting, and two 5 tons of horizontal adjusting hoists 12 are fixed on the corresponding layer plate surface of the installation structure, and are fixed on the 6 plate surface of the 6-layer structure plate of the main building, as shown in figure 6.
(2) The two preset steel wire ropes with the diameter of 18mm are connected with two preset horizontal adjusting hoists 12 on a floor slab, the installation bench is pulled to the installation position by the horizontal adjusting hoists 12, the tower crane 5 is matched with the lower bench node to be fixed, the bench plane position is adjusted by the two horizontal adjusting hoists 12, the elevation of the bench is adjusted by the tower crane 5 matched with the vertical adjusting hoists 11, the elevation and the horizontal position of the bench are checked by the leveling instrument and the total station, and the bench lower node is welded and fixed after the deviation meets the requirement.
(3) After the lower joint of the bench is fixed, the two 5 tons of elevation adjustment hand hoist 11 are in suspension connection with the structural steel beams of the 7-layer structural plate surface of the main building 7, and the tower crane 5 is unhooked.
It should be noted that, here, through fixedly mounting the installation link 17 on the first bench 21 roof beam of rotatory steel ladder 1, the size specification of installation link 17 is 300mm x 100mm x 20mm (length x width x thickness), simultaneously, fixedly mounting has the regulation otic placode 19 on the structure roof beam 20 of main building inner corresponding floor, the size specification of regulation otic placode 19 is 150mm x 20mm (length x width x thickness), the round hole 18 has all been seted up to correspondence on installation link 17 and the regulation otic placode 19, the diameter of round hole 18 is 30mm, and the round hole 18 interpolation is equipped with the bolt that is used for being used for with first bench of rotatory steel ladder and structure roof beam 20 fixed connection, the bolt adopts intensity level to be M20 x 70 high strength bolt simultaneously, adopt tower crane 5 to hoist, adopt the main wire rope of diameter 32mm to be connected with the lifting hook on the tower crane 5 during hoist, the installation bench is connected with the main rope on the tower crane 5 through 4 wire ropes that the diameter is 18mm and cooperation leveling hoist 12, the hoist section will be installed in advance during hoist leveling 12.
3) Installing 6-8 layers of three runners
And similarly, installing 6-8 layers and the rest 3 layers.
4) Installing 8-9 layers of three runners
(1) Firstly, 8 layers-9 layers of final running are installed, vertical hoisting is carried out through a 9-layer building plate hole tower crane during installation, the upper end of an installation bench is fixedly connected with a structural steel beam of the 9-layer structural plate surface of a main building 9, the lower end of the installation bench is fixedly hung by two 5-ton vertical adjusting hoists 11, standard height adjustment is carried out, horizontal adjustment is carried out, two horizontal adjusting hoists 12 are matched with one side of a steel wire rope to be connected with the 8-layer structural plate surface of the main building 8, the other side of the horizontal adjusting hoists is connected with the 9-layer structural plate surface of the main building 9 through the 9-layer building plate hole, as shown in an attached figure 8, the upper end of the bench is welded and fixed after the bench is adjusted through the matching of the vertical adjusting hoists 11 and the horizontal adjusting hoists 12, and the vertical adjusting hoists 11 and the steel wire ropes on two sides of the lower end are removed.
(2) And similarly, installing 8-9 layers of first running layers because of the height limitation and overlarge inclined angle, lowering the bench to a lower stair through a tower crane in advance, then providing a hole with the diameter of 10cm at the position of the surface of a 9-layer structural plate 9 of a main building, lowering a main steel wire rope from the hole, connecting a hook for hoisting in place, and determining the horizontal projection position of the main rope on the bench before the first hoisting at the hole drilling position and determining the hole drilling position through a drawing.
(3) Install middle race of 8-9 layers
And vertically hoisting and installing 8-9 layers of middle running through a tower crane, and after the position is adjusted, folding and fixing the bench with 8-9 layers of first running and 8-9 layers of last running.
The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, and yet fall within the scope of the invention.

Claims (6)

1. The method for installing the lower rotary steel ladder section translation of the floor system with the limited structure is characterized by comprising the following steps of:
in the civil engineering construction process, temporary protective rails are installed on two sides of a design position according to the design position of a rotary steel ladder, and hanging frames are fixedly installed on the top layer structure plate surface where the rotary steel ladder is located and on a first stair turning section from top to bottom along the height direction of the rotary steel ladder respectively;
after the hanging frame is installed, a vertical adjusting block is fixedly installed on the hanging frame, and a horizontal adjusting block for obliquely pulling the ladder section to be in place and fixing is fixedly installed on the corresponding floor surface of each ladder section;
segmenting the rotary steel ladder according to the design, and sequentially hoisting the first layer and the ladder section of the middle layer from bottom to top along the height direction of the rotary steel ladder by adopting a tower crane and matching with a vertical adjusting block and a horizontal adjusting block;
after the first layer and the middle layer bench are installed, the last running section and the first running section of the top layer are installed respectively, and after the installation is completed, the middle running section of the top layer is vertically hoisted by adopting a tower crane and is fixedly connected with the first running section and the last running section respectively.
2. The method for installing the rotary steel ladder under the floor of the limited structure in a segmental translation manner as claimed in claim 1, wherein: the hanging bracket comprises I-steel fixedly installed on one side, far away from the structural plate surface, of the structural plate surface, and two vertical adjusting blocks which are respectively fixed and hung on two ends of the I-steel along the length direction through steel wire ropes.
3. The method for installing the rotary steel ladder under the floor of the limited structure in a segmental translation manner as claimed in claim 2, wherein: the anti-bank Liang Yuanli structure face one side fixed mounting has the buried plate, the I-steel with buried plate fixed welding just correspond two on the I-steel two vertical regulation calabash respectively fixed mounting hangs the lug, vertical regulation calabash pass through wire rope with hang the lug and be connected.
4. The method for installing the rotary steel ladder under the floor of the limited structure in a segmental translation manner as claimed in claim 1, wherein: the rotary steel ladder is characterized in that an installation hanging plate is fixedly installed on a ladder section beam of the initial end of the rotary steel ladder, an adjusting lug plate is fixedly installed on a structural beam corresponding to a floor in a main building, round holes are correspondingly formed in the installation hanging plate and the adjusting lug plate, and bolts used for fixedly connecting the ladder section of the initial end of the rotary steel ladder with the structural beam are inserted into the round holes.
5. The method for installing the rotary steel ladder under the floor of the limited structure in a segmental translation manner as claimed in claim 1, wherein: the two ends of the horizontal adjusting block are respectively fixedly connected with the installation bench of the rotary steel ladder and the main building floor structure plate surface corresponding to the installation bench.
6. The method for installing the rotary steel ladder under the floor of the limited structure in a segmental translation manner as claimed in claim 1, wherein: and two ends of the vertical adjusting block are fixedly connected with the hanging bracket and the installation bench of the rotary steel ladder respectively.
CN202310053016.8A 2023-02-03 2023-02-03 Subsection translation installation method for lower rotary steel ladder of building cover with limited structure Pending CN116065773A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310053016.8A CN116065773A (en) 2023-02-03 2023-02-03 Subsection translation installation method for lower rotary steel ladder of building cover with limited structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310053016.8A CN116065773A (en) 2023-02-03 2023-02-03 Subsection translation installation method for lower rotary steel ladder of building cover with limited structure

Publications (1)

Publication Number Publication Date
CN116065773A true CN116065773A (en) 2023-05-05

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Application Number Title Priority Date Filing Date
CN202310053016.8A Pending CN116065773A (en) 2023-02-03 2023-02-03 Subsection translation installation method for lower rotary steel ladder of building cover with limited structure

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