CN112412035A - Construction method of high-altitude net rack moving platform - Google Patents
Construction method of high-altitude net rack moving platform Download PDFInfo
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- CN112412035A CN112412035A CN202011105148.3A CN202011105148A CN112412035A CN 112412035 A CN112412035 A CN 112412035A CN 202011105148 A CN202011105148 A CN 202011105148A CN 112412035 A CN112412035 A CN 112412035A
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- Prior art keywords
- pipe
- net rack
- moving platform
- welding
- pipeline
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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
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
- E04D13/00—Special arrangements or devices in connection with roof coverings; Protection against birds; Roof drainage; Sky-lights
- E04D13/04—Roof drainage; Drainage fittings in flat roofs, balconies or the like
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
- E04D13/00—Special arrangements or devices in connection with roof coverings; Protection against birds; Roof drainage; Sky-lights
- E04D13/04—Roof drainage; Drainage fittings in flat roofs, balconies or the like
- E04D13/064—Gutters
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
- E04D13/00—Special arrangements or devices in connection with roof coverings; Protection against birds; Roof drainage; Sky-lights
- E04D13/04—Roof drainage; Drainage fittings in flat roofs, balconies or the like
- E04D13/08—Down pipes; Special clamping means therefor
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H5/00—Buildings or groups of buildings for industrial or agricultural purposes
- E04H5/02—Buildings or groups of buildings for industrial purposes, e.g. for power-plants or factories
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
- E04D13/00—Special arrangements or devices in connection with roof coverings; Protection against birds; Roof drainage; Sky-lights
- E04D13/04—Roof drainage; Drainage fittings in flat roofs, balconies or the like
- E04D13/08—Down pipes; Special clamping means therefor
- E04D2013/084—Means for fixing down pipes to structure
Abstract
The invention discloses a construction method of an overhead net rack moving platform, which is suitable for welding construction of the overhead net rack moving platform, a siphon rainwater suspension beam and installation of a siphon rainwater pipe in a large factory building and a super-large factory building. In particular to a large high-altitude net rack factory building with a height of more than 15 meters. The siphon rainwater suspension beam and the rainwater pipe are operated, constructed and installed in a high-altitude net rack moving platform mode, so that the siphon rainwater system is fast, simple and convenient to install, meets the functional requirements and runs smoothly, has good economic and social benefits, can greatly shorten the construction period in advance, enhances the construction efficiency of field workers, increases the construction quality, reduces the construction cost, can ensure that the siphon rainwater pipe network system runs stably, and meets the requirement of smooth drainage in the continuous rainy weather in summer.
Description
Technical Field
The invention relates to the field of building construction, and is suitable for welding construction of high-altitude net rack moving platforms, siphon rainwater suspension beams and installation of siphon rainwater pipes of large plants and oversized plants. In particular to a large factory building with an overhead net rack of more than 15 meters, in particular to a construction method of an overhead net rack moving platform.
Background
In recent years, aiming at the electromechanical installation of high-altitude net rack construction such as large-scale factory buildings, gymnasiums and the like, a whole set of effective construction operation and installation flow is gradually formed, so that the construction safety, the installation quality and the like are greatly improved, the cost is saved, and the benefit maximization is realized.
However, the existing composite material central factory buildings are large-space high-altitude net racks (the upper rotary ball, the lower rotary ball and the connecting rod thereof are welded and installed), when the siphon rainwater suspension beam and the rainwater pipe are installed in construction, the mechanical installation is difficult, the construction height is high, the construction site is uneven, large-area operation cannot be carried out by a mechanical bench, and if a crank arm type high-altitude operation vehicle is adopted for construction, the siphon rainwater suspension beam and the rainwater pipe are very difficult to install, the construction period is long, the cost is high, and the economic and social benefits are poor.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a construction method of a high-altitude net rack moving platform aiming at the defects of the prior art, so that a siphon rainwater system is quickly, simply and conveniently installed, meets the functional requirements and smoothly runs, and has better economic and social benefits.
The technical scheme is as follows: the invention relates to a construction method of a high-altitude net rack moving platform, which is used for installing a siphon rainwater suspension beam and a rainwater pipe on a high-altitude net rack, wherein the high-altitude net rack comprises an upward rotating ball, a downward rotating ball and a connecting rod, and is characterized by comprising the following steps of:
s1: erecting a moving platform on a high-altitude net rack, wherein the moving platform moves forwards or backwards in a rope pulling mode;
s2: vertically welding an L-shaped steel plate in the middle of the suspension beam, conveying the suspension beam welded with the L-shaped steel plate into a high-altitude net rack by using a hoisting device, and welding the end part of the L-shaped steel plate on the top of the swing ball to enable the horizontal plane of the suspension beam to be parallel to a connecting rod between the two swing balls;
s3: sequentially installing a gutter, a siphon rainwater hopper, branch pipes, a horizontal pipe and a vertical pipe, installing and connecting section by section according to the designed pipe section length and the type of accessories, fixing the pipeline firmly in time by using a guide pipe clamp and an adjustable pipe clamp, and installing a fixed point arc ring and a fire stopping ring according to the standard requirement;
s4: after the pipeline is installed, a water test is carried out according to the design and specification requirements, a water filling test must be carried out on an internally concealed or buried drainage pipeline before concealment, the water filling time is 60 minutes, the water filling height must reach an upper siphonic rainwater hopper of each vertical pipe, the rainwater pipeline is smooth, the pipe orifice joint does not leak, and the water surface of the pipe orifice does not drop to be qualified.
Preferably, the specific process of setting up the mobile platform in S1 is as follows: install the cross arm earlier and bend over a slow fire, the cross arm adopts DN25 galvanized steel pipe, bend over a slow fire is sickle-shaped steel pipe, bend over a slow fire welding is at the both ends of cross arm, the cross arm is laid on the connecting rod of high altitude rack through bend over a slow fire, bend over a slow fire binds through iron wire and connecting rod, places moving platform on the cross arm again, and moving platform can move on a plurality of cross arms.
Preferably, in S2, the suspension cage is hung on the connecting rod of the high-altitude net rack, the constructor hangs the safety belt on the connecting rod, welds the suspension beam in the suspension cage, and welds the suspension beam welded with the L-shaped steel plate to the high-altitude net rack.
Preferably, in S3, after the gutter is installed, a hole is formed at a designed position, the siphon rain scoop is welded at the bottom of the gutter, a full welding method using a stainless steel argon arc welding process is adopted, the installation part of the siphon rain scoop is guaranteed to be horizontal to the bottom surface of the gutter, the siphon rain scoop is uniformly and fully welded without being penetrated during welding, the welding part is ground and flattened after welding, a layer of anticorrosive paint is coated on the surface of the welding part, and the siphon rain scoop is connected with the pipe by a connection method using an electric welding pipe hoop, so that the pipe and the siphon rain scoop are integrated into a closed whole, and the air tightness is improved.
Preferably, in S3, according to various conditions of a construction site, the position of a fixed point is reasonably calculated when a horizontal pipeline is installed, so as to ensure the length and position of the guide pipe clamp, the anchor pipe clamp and the fixed point of the electric welding pipeline, the fixed point guides the axial pressure to the fixed point of the pipeline, the fixed point guides the axial pressure to a square steel rail parallel to the pipeline, the square steel rail is connected with a building or a roof structure in a suspension manner, so as to increase the flexibility of the suspension position of the pipeline, and the steel rail is installed by analyzing the pressure and deformation guide during manufacturing;
the prefabricated fixing system is installed according to the designed position, firstly, installation sheets are welded on a steel structure according to the designed quantity and position of a square guide pipe system for suspending a horizontal pipeline, or the installation sheets are fixed on reinforced concrete by steel expansion bolts, galvanized square steel with the model number of 30 x 2 is fixed by one of a fastening device of a screw rod, a riding clamp or a pipe clamp, and the levelness is adjusted to meet the design requirement so as to install the horizontal pipeline;
installation of the riser fixture also requires that the mounting tabs be secured to the post or wall for riser clamp installation as dictated by design requirements and specifications.
Has the advantages that: (1) the siphon rainwater suspension beam and the rainwater pipe are operated, constructed and installed in a high-altitude net rack moving platform mode, so that the siphon rainwater system is fast, simple and convenient to install, meets the functional requirements and runs smoothly, has good economic and social benefits, can greatly shorten the construction period in advance, enhances the construction efficiency of field workers, increases the construction quality, reduces the construction cost, can ensure that the siphon rainwater pipe network system runs stably, and meets the requirement of smooth drainage in the continuous rainy weather in summer.
(2) By simple facilities, a firm platform is achieved. Not only saves cost, but also enhances construction efficiency.
Detailed Description
The technical solution of the present invention is described in detail below, but the scope of the present invention is not limited to the embodiments.
Example (b): the embodiment is suitable for welding construction of the high-altitude net rack moving platform, a siphon rainwater suspension beam and installation of a siphon rainwater pipe in large plants and super-large plants, particularly the high-altitude net rack large plants more than 15 meters. Mainly through set up the bending machine on high altitude rack connecting rod and install moving platform on high altitude rack, there is the guardrail moving platform both sides, and high altitude rack sets up a safety rope according to the moving direction. A springboard is erected on the net rack lower spin ball connecting rod to facilitate the walking of constructors, and the constructors adopt steel crawling ladders from the springboard to the high-altitude moving platform. An operator hangs the safety belt on the safety rope on the mobile platform to perform the welding work of the siphon rainwater suspension beam and the installation work of the siphon rainwater pipe. The high-altitude operation platform moves forwards or backwards in a rope pulling mode. Thereby constructor carries out the welding of siphon rainwater suspension beam, the installation of siphon downspout, the installation of siphon rainwater fill.
The mobile platform comprises the following concrete construction steps:
in this embodiment, the height of the net rack is 14 m at the center of the lower spin ball and 18 m at the center of the upper spin ball. The net rack siphon rainwater pipeline is positioned in four gutter channels with the D axis, the F axis being 8 meters away from the west, the G axis being 8 meters away from the east and the J axis, and the siphon rainwater pipeline is positioned one meter below the gutter channels. The D-axis gutter and the J-axis gutter are 1 siphon rainwater pipes, so that the suspension beam support is welded on purlines among the spiral balls at intervals of 4 meters by adopting 8# channel steel. As a siphon rain pipe suspension bracket. The gutter with the F axis being 8 meters away from the west and the G axis being 8 meters away from the east is two siphon rainwater pipes respectively. Therefore, an L-shaped steel plate is welded on the two spin-ups below the gutter, and the L-shaped steel plate is a steel plate with the diameter of delta =12 mm. The cross arm adopts 12# I-steel, and 8# channel steel (2 meters each) is vertically welded on the I-steel as a siphon rainwater pipe suspension bracket.
When moving platform installs, install the cross arm earlier and bend over a slow fire, the cross arm adopts DN25 galvanized steel pipe, bend over a slow fire is sickle-shaped steel pipe, the welding of bend over a slow fire is at the both ends of cross arm, the cross arm is laid on the connecting rod of high altitude rack through bend over a slow fire, bend over a slow fire binds through iron wire and connecting rod, places moving platform again on the cross arm, and moving platform can move on a plurality of cross arms. The DN25 galvanized pipe cross arm is ensured to be always subjected to downward vertical force, the larger the force is, the larger the friction force between the simmer bend on the cross arm and the connecting rod of the high-altitude net rack is, and the more stable the connecting rod is. The higher the safety of the mobile platform laid on the cross arm.
The moving platform is welded by 5# angle steel, the fence vertical rod is welded by 5# angle steel, and then a DN15 galvanized steel pipe is welded on the vertical rod 5# angle steel. The moving platform is welded on 5# angle steel by adopting 4# square steel, and the distance is 50 cm. The moving platform was then flooded with 2cm thick wood. And fixing the wood board and the 5# angle steel by using iron wires.
The springboard is laid on a connecting rod of a 14-meter downward-rotating ball of the net rack elevation below the mobile platform, the thickness of the springboard is delta =3cm, the width of the springboard is =40cm, the two sides of the springboard are bound and fixed by 5# angle steel, the length of each section of the springboard is 8 meters, and the joints of the springboard and the springboard are welded by the 5# angle steel and are connected by punching with iron wires.
Constructors walk from the springboard, and the safety belt is hung on the life line to ensure the life safety of the constructors. When the construction operation is carried out on the mobile platform, the safety belt is hung on the connecting rod of the high-altitude net rack or the welded suspension beam.
When the suspension beam and the net rack spinning balls are welded on site, a suspension cage is manufactured and hung on a connecting rod between the high-altitude net rack spinning balls. Constructors hang the safety belt on the connecting rod and weld the suspension beam in the suspension cage.
Under the mobile platform, the suspension beam, the siphon rainwater HDPE pipeline, the siphon rainwater hopper and the like are adjusted to the high-altitude net rack from the ground by using the suspension rope and are installed. The warning area is made by the warning rope on the ground, and other people are prevented from entering the warning dangerous area during the crossed construction operation on the ground. And when high-altitude construction works, field security personnel must supervise in place.
To ensure that the siphon rain suspension beam is welded on the spinning balls of the net rack, a straight line is arranged right below the two spinning balls and the siphon rain suspension beam is ensured to be kept completely horizontal after the horizontal plane welding is finished
Through the analysis of the mobile platform, the following beneficial effects are achieved:
on-site constructors can carry out construction and operation on the high-altitude mobile platform under the condition of ensuring safety and reliability. And the welding of the siphon rainwater suspension beam and the welding of the L-shaped steel plate and the upper spin ball of the high-altitude net rack form a full weld joint. The welding quality is greatly improved. Thereby ensuring the safe and reliable operation of the siphon rainwater drainage system pipeline on the roof of the composite material central plant. Adopt the hot melt to connect siphon rainwater pipeline, construction operating personnel has enough space and the stability of operation at high altitude moving platform electric heat melting. Thereby increasing the qualification rate of the connection quality of the siphon rainwater pipeline and ensuring no leakage point. The primary installation qualification rate is 100 percent.
Further, after the installation of moving platform was accomplished, it suspends roof beam welding installation in midair to carry out the siphon rainwater, and in this embodiment, the siphon rainwater suspends the roof beam in midair and adopts 12# I-steel to with L shaped steel plate welding, L shaped steel plate is delta =12mm steel sheet welding. The lower end of the L-shaped steel plate and the 12# I-steel are welded in the middle of the 12# I-steel, deviation is avoided, and otherwise the safety of a siphon rainwater drainage system of the whole plant in the center of the composite material is affected. The L-shaped steel plate and the 12# I-shaped steel are required to be ensured to be vertical and not to be inclined. The welding seam between the L-shaped steel plate and the 12# I-shaped steel is full, and the surface of the welding seam is in smooth transition. Welding slag, air holes, non-fusion, splashes and the like cannot be generated. And after the lower end of the L-shaped steel plate is welded with the 12# I-shaped steel, the L-shaped steel plate is conveyed into a high-altitude net rack by using a rope and a pulley for installation.
Construction and installation of siphon rainwater pipes:
furthermore, after the siphon rainwater suspension beam is welded and installed, siphon rainwater pipe connection installation construction is carried out. Siphon rainwater system security is high, and the pipeline trend can set up according to actual needs, satisfies the rainwater emission of modern large-scale factory building, square and various spatial grid's metal roofing when not influencing building function and usage space. Meanwhile, the siphon rainwater pipe has self-cleaning capability and is not easy to block. The single rainwater hopper has large discharge capacity, the roof is provided with few holes, the probability of roof water leakage is reduced, and the roof waterproof pressure is reduced.
The construction sequence is carried out according to the sequence of the roof siphon rainwater hopper, the branch pipe, the horizontal pipe and the vertical pipe, and prefabrication can be carried out as much as possible so as to accelerate the construction progress. After the concrete gutter construction is finished, a hole is formed in a designed position, the siphon rainwater hopper is welded at the bottom of the gutter, a full welding method of a stainless steel argon arc welding process is adopted, the installation position of the siphon rainwater hopper ensures that the siphon rainwater hopper and the bottom surface of the gutter are horizontal, the siphon rainwater hopper and the bottom surface of the gutter are uniformly and fully welded during welding and cannot be welded through, the welding position is ground and leveled after the welding is finished, a layer of anticorrosive paint is coated on the surface of the welding position, and the siphon rainwater hopper and the HDPE pipe are connected by adopting a connection method of an electric welding pipe hoop, so that the pipe and the siphon rainwater hopper can be formed into a closed whole, the system has extremely high air tightness, and reliable guarantee is provided for the good operation of the whole siphon system.
The installation and connection are carried out section by section according to the designed length of the pipe section and the type of the fittings, the pipe is fixed firmly by the guide pipe clamp and the adjustable pipe clamp in time, and the fixed point arc ring and the fire stopping ring are installed according to the standard requirement. When the pipeline is installed in the construction process of the suction type rainwater drainage system, the pipeline must be leveled, the quality and the attractiveness are ensured, the construction quality of the pipeline system is checked in time after each process is finished, deviation items are adjusted in time, the levelness of the horizontal pipeline and the verticality of the vertical pipe are adjusted to meet the design requirements, the pipe clamp is effective, and the appearance is neat and attractive.
According to various conditions of a construction site, the position of a fixed point is reasonably calculated when a horizontal pipeline is installed, the length and the point position of a guide pipe clamp (a sliding bracket), the fixed point of an anchoring pipe clamp and an electric welding pipeline are ensured, the fixed point guides axial pressure to the fixed point of the pipeline, the fixed point guides axial pressure to a square steel rail parallel to the pipeline, the square steel rail is connected with a building or a roof structure in a suspension mode, the flexibility of the suspension position of a system is provided, the steel rail is installed in a guide mode of analyzing pressure and deformation (extension) during manufacturing, the fixing method has the advantages that axial expansion is avoided, the distance between the anchoring pipe clamps is 6m at most, the distance between the guide pipe clamps is 15 times of pipe diameter at most, and a vertical pipe is provided with the pipe clamp.
The prefabricated fixing system is installed according to the designed position, firstly, the installation sheets are welded on a steel structure according to the designed quantity and position for a square conduit system suspending the horizontal pipeline, if the square conduit system is in a reinforced concrete structure, the installation sheets are fixed on the reinforced concrete by steel expansion bolts, 30 × 2 galvanized square steel is fixed by fastening devices such as screw rods, riding clamps, pipe clamps and the like, and the levelness is adjusted to meet the design requirement so as to install the horizontal pipeline.
Installation of the riser fixture also requires that the mounting tabs be secured to the post or wall for riser clamp installation as dictated by design requirements and specifications.
After the pipeline is installed, a water test must be carried out according to the design and specification requirements, and a water filling test must be carried out before the concealed or buried drainage pipeline is concealed. The irrigation time is 60 minutes, the irrigation height must reach the upper rainwater hopper of each vertical pipe, the rainwater pipeline is smooth, the pipe orifice joint is not leaked, and the water surface of the pipe orifice is not reduced to be qualified.
As noted above, while the present invention has been shown and described with reference to certain preferred embodiments, it is not to be construed as limited thereto. Various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. A construction method of a high-altitude net rack moving platform is used for installing a siphon rainwater suspension beam and a rainwater pipe on a high-altitude net rack, the high-altitude net rack comprises an upward rotating ball, a downward rotating ball and a connecting rod, and the construction method is characterized by comprising the following steps:
s1: erecting a moving platform on a high-altitude net rack, wherein the moving platform moves forwards or backwards in a rope pulling mode;
s2: vertically welding an L-shaped steel plate in the middle of the suspension beam, conveying the suspension beam welded with the L-shaped steel plate into a high-altitude net rack by using a hoisting device, and welding the end part of the L-shaped steel plate on the top of the swing ball to enable the horizontal plane of the suspension beam to be parallel to a connecting rod between the two swing balls;
s3: sequentially installing a gutter, a siphon rainwater hopper, branch pipes, a horizontal pipe and a vertical pipe, installing and connecting section by section according to the designed pipe section length and the type of accessories, fixing the pipeline firmly in time by using a guide pipe clamp and an adjustable pipe clamp, and installing a fixed point arc ring and a fire stopping ring according to the standard requirement;
s4: after the pipeline is installed, a water test is carried out according to the design and standard requirements, a water filling test is carried out on the drainage pipeline which is internally hidden or buried before being hidden, the water filling time is 60 minutes, the water filling height reaches the upper siphonic rainwater hopper of each vertical pipe, the rainwater pipeline is smooth, the pipe orifice joint does not leak, and the water surface of the pipe orifice does not drop to be qualified.
2. The construction method of the high-altitude net rack moving platform as claimed in claim 1, wherein the specific process of building the moving platform in the step S1 is as follows: install the cross arm earlier and bend over a slow fire, the cross arm adopts DN25 galvanized steel pipe, bend over a slow fire is sickle-shaped steel pipe, bend over a slow fire welding is at the both ends of cross arm, the cross arm is laid on the connecting rod of high altitude rack through bend over a slow fire, bend over a slow fire binds through iron wire and connecting rod, places moving platform on the cross arm again, and moving platform can move on a plurality of cross arms.
3. The construction method of the high-altitude net rack moving platform as claimed in claim 2, wherein in S2, a suspension cage is hung on the connecting rod of the high-altitude net rack, a constructor hangs a safety belt on the connecting rod, welding work of the suspension beam is performed in the suspension cage, and the suspension beam welded with the L-shaped steel plate is welded to the high-altitude net rack.
4. The construction method of the overhead net rack moving platform according to claim 1, wherein in S3, after the gutter is installed, a hole is formed at a designed position, the siphon rain scoop is welded to the bottom of the gutter, a stainless steel argon arc welding process is adopted to perform full welding, the installation part of the siphon rain scoop is ensured to be horizontal to the bottom of the gutter, the siphon rain scoop is uniformly and fully welded without penetration during welding, the welding part is ground and flattened after welding, a layer of anti-corrosion coating for the welding part is coated on the surface of the welding part, and the siphon rain scoop is connected with the pipe by adopting a pipe hoop connection method, so that the pipe and the siphon rain scoop form a closed whole and the air tightness is improved.
5. The construction method of the high-altitude net rack moving platform according to claim 1, wherein in S3, according to various conditions of a construction site, the position of a fixed point is reasonably calculated when a horizontal pipeline is installed, the length and the point position of a guide pipe clamp, an anchoring pipe clamp and a fixed point of an electric welding pipeline are obtained, the fixed point guides axial pressure to the fixed point of the pipeline, the fixed point guides the axial pressure to a square steel rail parallel to the pipeline, and the square steel rail is connected with a building or a roof structure in a suspension mode, so that the flexibility of the suspension position of the pipeline is increased;
the prefabricated fixing system is installed according to the designed position, firstly, installation sheets are welded on a steel structure according to the designed quantity and position of a square guide pipe system for suspending a horizontal pipeline, or the installation sheets are fixed on reinforced concrete by steel expansion bolts, galvanized square steel with the model number of 30 x 2 is fixed by one of a fastening device of a screw rod, a riding clamp or a pipe clamp, and the levelness is adjusted to meet the design requirement so as to install the horizontal pipeline;
installation of the riser fixture also requires that the mounting tabs be secured to the post or wall for riser clamp installation as dictated by design requirements and specifications.
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| CN202011105148.3A CN112412035A (en) | 2020-10-15 | 2020-10-15 | Construction method of high-altitude net rack moving platform |
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| CN202011105148.3A CN112412035A (en) | 2020-10-15 | 2020-10-15 | Construction method of high-altitude net rack moving platform |
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