CN212406038U - Lower hanging construction platform module of high-altitude large-cantilever steel roof truss - Google Patents
Lower hanging construction platform module of high-altitude large-cantilever steel roof truss Download PDFInfo
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- CN212406038U CN212406038U CN202021381949.8U CN202021381949U CN212406038U CN 212406038 U CN212406038 U CN 212406038U CN 202021381949 U CN202021381949 U CN 202021381949U CN 212406038 U CN212406038 U CN 212406038U
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- 238000010276 construction Methods 0.000 title claims abstract description 83
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 53
- 239000010959 steel Substances 0.000 title claims abstract description 53
- 230000001681 protective effect Effects 0.000 claims abstract description 28
- 239000002184 metal Substances 0.000 claims description 18
- 238000003466 welding Methods 0.000 claims description 13
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- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 4
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- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 4
- 239000011425 bamboo Substances 0.000 claims description 4
- 238000009415 formwork Methods 0.000 claims description 2
- 239000011150 reinforced concrete Substances 0.000 abstract description 3
- 239000002689 soil Substances 0.000 abstract description 2
- 230000007306 turnover Effects 0.000 abstract description 2
- 230000002441 reversible effect Effects 0.000 description 30
- 230000004888 barrier function Effects 0.000 description 12
- 238000009434 installation Methods 0.000 description 10
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- 239000004567 concrete Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
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- 238000002360 preparation method Methods 0.000 description 2
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- 230000008878 coupling Effects 0.000 description 1
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- 238000005034 decoration Methods 0.000 description 1
- 238000007730 finishing process Methods 0.000 description 1
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Abstract
本实用新型涉及一种高空大悬挑钢屋架的下挂施工平台模块，特征在于：包括平台踏板、由桁架和多个水平连接杆连接构成的作业平台架，在作业平台架对应施工墙体的一侧上固定有多个反挂连接杆，作业平台架装有反挂连接杆一侧上和与反挂连接杆相邻的一侧上设有防护栏杆，在作业平台架底部对应反挂连接杆的一侧上设有多个下连接附杆，水平连接杆两端分别与桁架连接。优点是：在高空大悬挑钢筋混凝土坡屋面施工中，采用本挂施工平台模块，可根据工作面大小要求灵活布设，调运速度快，周转效率高，大幅度提高施工效率，且不会受建筑物周围土体承载力限制，应用极为范围广泛，其安全防护设施可根据实际施工情况灵活配置，大幅提升施工人员的人身安全。
The utility model relates to a down-hanging construction platform module for a high-altitude large cantilevered steel roof truss, which is characterized in that it comprises a platform pedal, a working platform frame connected by a truss and a plurality of horizontal connecting rods, and the working platform frame corresponds to the construction wall. A plurality of anti-hanging connecting rods are fixed on one side, and the working platform frame is equipped with anti-hanging connecting rods. There are protective railings on one side and the side adjacent to the anti-hanging connecting rods. The bottom of the working platform frame corresponds to the anti-hanging connecting rods. A plurality of lower connecting rods are arranged on one side of the rod, and two ends of the horizontal connecting rod are respectively connected with the truss. The advantages are: in the construction of high-altitude and large cantilevered reinforced concrete sloping roofs, the use of this hanging construction platform module can be flexibly laid out according to the size of the working surface, the speed of dispatch and transportation is fast, the turnover efficiency is high, the construction efficiency is greatly improved, and it will not be affected by the construction. The bearing capacity of the surrounding soil is limited, and the application range is extremely wide. Its safety protection facilities can be flexibly configured according to the actual construction situation, which greatly improves the personal safety of construction personnel.
Description
Technical Field
The utility model belongs to the technical field of the construction, especially, relate to a lower of steel roof truss of encorbelmenting greatly in high altitude hangs construction platform module.
Background
At present, an engineering roof is a reinforced concrete slope roof, the overhanging length of a roof cornice is 4.2m, the overhanging height is 50.1m, the plate thickness is 0.12m, and a floor type scaffold support frame body needs to be erected to complete construction operations such as formwork support and pouring. The above construction operations have the following drawbacks: 1. the height of the floor type scaffold support frame body is over 50m, the danger coefficient is very large, construction drawings need to be designed additionally according to standard requirements and safety argumentation is carried out, safety guarantee measures are necessary to be comprehensive, and implementation difficulty is very large. 2. The top of the frame body needs to be overhung outwards, the maximum overhung length is about 6.2m, the distance between the rod pieces must be encrypted to ensure the overall stability of the frame body, a large amount of materials such as steel pipes and link pieces are inevitably input, the construction and use cost is greatly increased, and the danger coefficient is larger. 3. The roof cornice decoration and finishing process needs an independent operation platform, partial scaffold at the top of the support frame body needs to be dismantled and modified according to the requirements of a construction platform, the frame body occupies long time, and the construction cost greatly rises. 4. The floor type scaffold is erected and a construction platform is transformed, so that the labor consumption and the number of mechanical machine shifts are large, and the construction period is long.
Disclosure of Invention
The utility model discloses a solve the technical problem that exists among the well-known art and provide a simple structure, be convenient for install fast and demolish, lay in a flexible way, have enough to meet the need efficiently and can promote constructor personal safety and efficiency of construction's high altitude steel roof truss of encorbelmenting greatly and hang construction platform module down.
The utility model discloses a solve the technical scheme that technical problem that exists among the well-known technique took and be:
hang construction platform module under of steel roof truss that encorbelments greatly in high altitude, its characterized in that: including the platform footboard, connect the operation platform frame that constitutes by truss and a plurality of horizontal connecting rod, be fixed with a plurality of anti-connecting rods that hang on one side that operation platform frame corresponds the construction wall body, operation platform frame is equipped with on anti-connecting rod one side and is equipped with protective barrier on one side adjacent with anti-connecting rod, is equipped with a plurality of lower connections and attaches the pole on one side that operation platform frame bottom corresponds anti-connecting rod, the horizontal scheme:
preferably, both ends of the connecting rod are respectively connected with the truss.
The utility model discloses can also adopt following technique operation platform frame be equipped with on the anti-connecting rod one side and with the anti-one side that is adjacent of hanging the connecting rod on the rigid coupling have a protection railing, the horizontal connecting rod both ends respectively with truss fixed connection, protection railing comprises square steel pipe welding.
Preferably, the reverse hanging connecting rod is formed by welding square steel pipes, a square hook part used for being reversely hung in a metal gutter of the high-altitude large-cantilever steel roof truss is arranged at the upper end of the reverse hanging connecting rod, two inclined supporting rods are welded in the square hook part at the upper end of the reverse hanging connecting rod, and an anti-bending inclined rod is arranged at the lower part of the reverse hanging connecting rod.
Preferably, the truss of the operation platform frame is provided with a platform pedal, and the operation platform frame is at least connected with two layers of horizontal connecting rods.
Preferably, the platform pedal is made by combining a bamboo foot plate capable of meeting the load requirement, a plurality of layers of templates and a metal strip-shaped pedal.
Preferably, the anti-hanging connecting rod is provided with a protective barrier connecting socket, the truss adjacent to the anti-hanging connecting rod is provided with a horizontal connecting rod connecting socket respectively, the anti-hanging connecting rod is inserted with a protective barrier through the protective barrier connecting socket, two ends of the horizontal connecting rod are connected with the horizontal connecting rod connecting socket of the truss in an inserting mode respectively, and the protective barrier is formed by welding square steel pipes.
Preferably, the lower connecting auxiliary rod is made of square steel pipes and is welded with the operating platform frame and the wall connecting piece respectively.
The utility model has the advantages and positive effects that: because the above technical scheme is adopted in the utility model, in carrying out the construction of the high altitude reinforced concrete sloping roof of encorbelmenting greatly, adopt the lower construction platform of hanging that constitutes by hanging the construction platform module down, not only can lay in a flexible way according to working face size requirement, transfer and transportation speed is fast, the turnover efficiency is high, increase substantially the efficiency of construction, can not receive the restriction of soil body bearing capacity around the building in addition, it is extensive to use very much, its safety protection facility can be according to the nimble configuration of actual construction condition, promote constructor's personal safety by a wide margin. The lower hanging construction platform module is simple in structure, the manufacturing period can be greatly shortened, the manufacturing materials are common, and the cost is low. In addition, the damage rate of the module component of the lower hanging construction platform is low, and the module component can be recycled. Hang construction platform module dismouting simple and efficient down, need not additionally to occupy hoist and mount machinery setting up with the dismantlement process, for cross operation provides convenient condition, more traditional console mode support body work platform preparation and construction, its construction cost can reduce by a wide margin.
Drawings
Fig. 1 is a front view of embodiment 1 of the present invention;
FIG. 2 is a right side view of FIG. 1;
FIG. 3 is a top view of FIG. 1;
FIG. 4 is a construction state diagram of embodiment 1 of the present invention;
fig. 5 is a front view of embodiment 2 of the present invention;
FIG. 6 is a right side view of FIG. 5;
FIG. 7 is a top view of FIG. 5;
fig. 8A is a horizontal connecting rod structure view of embodiment 2 of the present invention;
FIG. 8B is a side view of FIG. 8A;
fig. 9 is a construction state diagram of embodiment 2 of the present invention.
In the figure: 1. a work platform frame; 1-1, a truss; 1-2, horizontal connecting rods; 2. a platform pedal; 3. reversely hanging a connecting rod; 3-1, a square hook part; 3-2, bending-resistant diagonal rods; 4. a guard rail; 5. a lower connecting attachment rod; 6. the protective railing is connected with the socket; 7. the horizontal connecting rod is connected with the socket; 8. cantilever steel beam; 9. and (4) forming a metal gutter.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1, referring to fig. 1-3,
the lower hanging construction platform module of the high-altitude large-cantilever steel roof truss comprises a platform pedal 2, an operation platform frame 1 consisting of trusses 1-1 and horizontal connecting rods 1-2 fixedly connected, wherein a plurality of reverse hanging connecting rods 3 are fixed on one side of the operation platform frame corresponding to a construction wall body, a protective barrier 4 is fixedly connected on one side of each operation platform frame provided with the reverse hanging connecting rods 3 and on the truss adjacent to the reverse hanging connecting rods, a plurality of lower connecting auxiliary rods 5 are arranged on one side of the operation platform frame bottom corresponding to the reverse hanging connecting rods, and two ends of each horizontal connecting rod are fixedly connected with the trusses respectively.
The anti-bending steel roof truss structure is characterized in that the reverse hanging connecting rod is formed by welding square steel pipes, a square hook portion 3-1 used for being reversely hung in a metal gutter of a high-altitude large-cantilever steel roof truss is arranged at the upper end of the reverse hanging connecting rod, two inclined supporting rods are welded in the square hook portion at the upper end of the reverse hanging connecting rod, and an anti-bending inclined rod 3-2 is arranged at the lower portion of the reverse hanging connecting rod. The reverse hanging connecting rod is reversely hung in the metal gutter of the high-altitude large-cantilever steel roof truss, and the lower end of the reverse hanging connecting rod is connected with the operation platform frame in a welding mode.
Specifically, a platform pedal 2 is arranged on a truss 1-1 of the operating platform frame, and at least two layers of horizontal connecting rods 1-2 are fixedly connected to the operating platform frame.
Specifically, the platform pedal is made by combining a bamboo foot plate capable of meeting the load requirement, a plurality of layers of templates and a metal strip-shaped pedal.
Specifically, the guard rail 4 is formed by welding square steel pipes.
Specifically, lower connection attaches pole 5 and is made by square steel pipe, lower connection attaches the pole and is connected with operation platform frame, wall body connecting piece welded connection respectively.
The utility model discloses embodiment 1's theory of operation does:
referring to fig. 4 of the drawings, a schematic diagram of a display device,
1. hoisting preparation:
pulling and placing the manufactured lower hanging construction platform module to a position vertically below a position to be lifted, and rechecking each node of the lower hanging construction platform module to ensure firm connection; and the contents of hoisting machinery, a hoisting tool, a hoisting point and the like are checked, so that the hoisting safety is ensured.
2. Hoisting and debugging:
and putting down a hoisting rope of the winch, connecting the hoisting rope to the hoisting points of the lower hanging construction platform module, slowly hoisting, and checking the stress condition of each hoisting point in detail after the hoisting rope is 50cm away from the ground to ensure that the hoisting rope is formally hoisted to the installation position after no problem exists. And checking each acting point, and not fixing after the checking is finished. And then, the lower hanging construction platform module is adjusted away from the installation position, slowly falls to the ground, the conditions of the hoisting equipment and the lower hanging construction platform module are checked, the problem is found and corrected in time, and the hoisting and debugging are finished.
3. And (3) formal hoisting:
a. and suspending the lower hanging construction platform module when the lower hanging construction platform module is lifted 50cm away from the ground, and continuously lifting after checking the verticality and the level of the lower hanging construction platform module without errors.
b. The shaking in the hoisting process is controlled by two wind cables.
c. After the height of the metal gutter 9 is lifted, the reverse hanging connecting rod 3 of the lower hanging construction platform module is placed into the metal gutter, the wind cable is utilized to pull and match with the horizontal movement of a hoisting device, the lower hanging construction platform module is moved to the installation position in parallel, the lower hanging construction platform module slowly falls down, the upper stress point is placed in the metal gutter (a base plate is added at the stress point position for preventing the reverse hanging connecting rod from damaging the metal gutter), the lower stress point is placed on the wall and the outer side surface of the column, rigid connection and fixation can be carried out through expansion bolts and other modes after the position is corrected, and steel cable flexible connection protection is carried out on the cantilever steel beam 8. The hoisting equipment can be reset by loosening the hook, and a next lower hanging construction platform module is ready to be hoisted.
d. Sequentially mounting the construction platform modules in a downward hanging manner by the same method;
f. after the whole installation of a set of lower construction platform modules, professional quality testing personnel and professional safety personnel check each important connecting point, and after the fact that the hundred percent of errors are correct is ensured, platform pedals can be laid.
g. Four steel wire safety ropes are hung on the steel roof truss cross beam by utilizing the steel roof truss cross beam, and the safety belts of constructors are hung on the safety ropes so as to ensure the safety of life.
h. After the lower hanging construction platform module is installed in place, the outer side protection handrails are installed immediately, the height of each protection handrail is not less than 1.2m, and the distance between the middle protection handrails is not more than 30 cm.
i. Can hang the construction platform module under according to actual need and set up the split bolt jib between the girder steel 8 of encorbelmenting to hang construction platform module bearing capacity and security under the promotion.
An openable protective railing with a locking device can be installed at the position of the material outlet and inlet of the L-shaped lower hanging construction platform.
Example 2, referring to fig. 5-8B,
the lower hanging construction platform module of the high-altitude large-cantilever steel roof truss comprises an operation platform frame 1 formed by connecting a platform pedal 2, a truss 1-1 and horizontal connecting rods 1-2, wherein a plurality of reverse hanging connecting rods 3 are fixed on one side of the operation platform frame corresponding to a construction wall body, protective barrier connecting sockets 6 are formed in the reverse hanging connecting rods, horizontal connecting rod connecting sockets 7 are formed in the trusses adjacent to the reverse hanging connecting rods respectively, protective barriers 4 are inserted into the reverse hanging connecting rods through the protective barrier connecting sockets, two ends of each horizontal connecting rod are connected with the horizontal connecting rod connecting sockets 7 of the truss in an inserting mode respectively, each protective barrier is formed by welding square steel pipes, and a plurality of lower connecting auxiliary rods 5 are arranged on one side of the operation platform frame bottom corresponding to the reverse hanging connecting rods.
The anti-bending steel roof truss structure is characterized in that the reverse hanging connecting rod is formed by welding square steel pipes, a square hook portion 3-1 used for being reversely hung in a metal gutter of a high-altitude large-cantilever steel roof truss is arranged at the upper end of the reverse hanging connecting rod, two inclined supporting rods are welded in the square hook portion at the upper end of the reverse hanging connecting rod, and an anti-bending inclined rod 3-2 is arranged at the lower portion of the reverse hanging connecting rod. The reverse hanging connecting rod is reversely hung in the metal gutter of the high-altitude large-cantilever steel roof truss, and the lower end of the reverse hanging connecting rod is connected with the operation platform frame in a welding mode.
Specifically, a platform pedal 2 is installed on a truss 1-1 of the operation platform frame, at least two layers of horizontal connecting rods 1-2 are inserted into the operation platform frame in an inserting mode, and specifically, the platform pedal is made by combining a bamboo foot plate capable of meeting the load requirement of the platform pedal, multiple layers of templates and a metal strip-shaped pedal.
Specifically, the two ends of the horizontal connecting rod are provided with bolts matched with the horizontal connecting rod connecting sockets 7 on the truss.
Specifically, the protection railing 4 is formed by welding square steel pipes, and the two ends of the protection railing are provided with bolts matched with the connection sockets 6 of the protection railing.
The anti-hanging connecting rod is provided with a protective railing connecting socket, a truss adjacent to the anti-hanging connecting rod is provided with a horizontal connecting rod connecting socket respectively, the anti-hanging connecting rod is inserted with a protective railing through the protective railing connecting socket, and two ends of the horizontal connecting rod are connected with the horizontal connecting rod connecting socket of the truss in an inserting mode respectively.
Specifically, lower connection attaches pole 5 and is made by square steel pipe, lower connection attaches the pole and is connected with operation platform frame, wall body connecting piece welded connection respectively.
The quantity of the reverse hanging connecting rods, the truss and the lower connecting auxiliary rods in the lower hanging construction platform module can be encrypted or reduced according to parameters such as the actual weight of the platform, the design load and the like.
The length, width and height of the lower hanging construction platform module can be adjusted according to the bearing capacity performance of the stressed member and the process requirements, and the safe use requirement can be met.
The utility model discloses embodiment 2's theory of operation does:
referring to fig. 9 of the drawings, a schematic diagram of a display device,
s1, preparing for hoisting a lower hanging construction platform module:
welding a reverse hanging connecting rod 3, a square hook part 3-1, a truss 1-1, a bending-resistant inclined rod 3-2, a lower connecting auxiliary rod 5, a protective railing connecting socket 6 and a horizontal connecting rod connecting socket 7 in a lower hanging construction platform module on the ground to form a barb type truss, conveying the barb type truss to the position to be lifted vertically below, checking whether the position of each lifting point is accurate, checking the running of a lifting machine and the safety condition of a lifting appliance, and checking whether the connection of the lifting points is firm; hanging the lifting rope and the wind cable according to the design requirement.
S2, hoisting and debugging the lower hanging construction platform module:
and putting down a hoisting rope of the winch, connecting the hoisting rope to the hoisting points of the lower hanging construction platform module, slowly hoisting, checking the stress condition of each hoisting point in detail after the hoisting rope is 50cm away from the ground, hoisting the lower hanging construction platform module to the installation position after no problem is ensured, checking each stress point, and not fixing the lower hanging construction platform module after the checking is finished. And then, the lower hanging construction platform module is adjusted away from the installation position and slowly falls to the ground, the conditions of the hoisting equipment and the lower hanging construction platform module are checked, the problem is found and corrected in time, and the hoisting and debugging are finished.
S3, hoisting the assembly type lower hanging construction platform module:
a. firstly hoisting the inverted hook type truss, suspending when the inverted hook type truss is hoisted to 50cm away from the ground, checking a lifting hook, a lifting rope, a guy rope and the like, and continuing hoisting after confirming that no potential safety hazard exists.
After the steel truss is lifted to the height of the metal gutter 9, the square hook part of the lower hanging construction platform module is placed into the metal gutter 9, the wind cable is utilized to pull and match with the horizontal movement of the hoisting equipment, the hoisting equipment is moved to the installation position in parallel and slowly falls down, a backing plate is added at the acting point position for preventing the square hook part of the barb type truss from damaging the metal gutter, the lower part of the barb type truss is corrected and then rigidly connected and fixed with structures such as a shear wall, a column or a concrete cornice through expansion bolts, and is protected by soft connection of steel cables with the cantilever steel beam 8, at the moment, the hoisting equipment can be loosened and reset, the rest barb type trusses are hoisted in sequence, the verticality, elevation and interval of the barb type trusses are strictly controlled, and the acceptance is timely.
b. And hoisting the horizontal connecting rod 1-2, suspending when the horizontal connecting rod is hoisted to 50cm away from the ground, checking a lifting hook, a lifting rope, a guy rope and the like, and continuing hoisting after no potential safety hazard is confirmed. The horizontal connecting rods are firstly hung to the concrete roof and then are conveyed to the installation position in a manual delivery mode, and after the installation and fixation of the barb type truss are completed and acceptance is checked, the horizontal connecting rods can be started to be inserted. When the horizontal connecting rods are inserted, the horizontal connecting rods are matched with each other by two persons from near to far.
c. And the lifting platform pedal 2 is suspended when lifted to 50cm above the ground, a lifting hook, a lifting rope, a guy rope and the like are checked, and the lifting is continued after no potential safety hazard is confirmed. The platform pedal is lifted to the concrete roof firstly, the platform pedal is installed step by step after the horizontal connecting rod is inserted and accepted, and the platform pedal is delivered by 1 person and laid and adjusted by 2 persons from near to far during installation.
d. And (4) hoisting the protective barrier 4, suspending when the protective barrier is hoisted to 50cm above the ground, checking a lifting hook, a lifting rope, a guy rope and the like, and continuing hoisting after confirming that no potential safety hazard exists. The protective railing is directly hoisted to the position where the platform pedal is paved, a small amount of adjustment and transportation are needed for many times, the protective railing is hoisted and installed at present, and a large amount of protective railing cannot be stacked on the lower hanging construction platform, so that safety accidents are prevented.
e. Four steel wire safety ropes are hung on a steel roof truss cross beam by utilizing the overhanging steel beam, and safety belts of constructors are hung on the safety ropes so as to ensure the personal safety of the constructors.
f. According to actual needs, a split bolt suspender is arranged between the lower hanging construction platform module and the cantilever steel beam, so that the bearing capacity and the safety of the lower hanging construction platform can be improved.
The quantity of the reverse hanging connecting rods, the truss and the lower connecting auxiliary rods in the lower hanging construction platform module can be encrypted or reduced according to parameters such as the actual weight of the platform, the design load and the like.
The length, width and height of the lower hanging construction platform module can be adjusted according to the bearing capacity performance of the stressed member and the process requirements, and the safe use requirement can be met.
The embodiments described in the drawings are exemplary only and should not be construed as limiting the invention.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021381949.8U CN212406038U (en) | 2020-07-14 | 2020-07-14 | Lower hanging construction platform module of high-altitude large-cantilever steel roof truss |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021381949.8U CN212406038U (en) | 2020-07-14 | 2020-07-14 | Lower hanging construction platform module of high-altitude large-cantilever steel roof truss |
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| CN212406038U true CN212406038U (en) | 2021-01-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021381949.8U Withdrawn - After Issue CN212406038U (en) | 2020-07-14 | 2020-07-14 | Lower hanging construction platform module of high-altitude large-cantilever steel roof truss |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111764623A (en) * | 2020-07-14 | 2020-10-13 | 天津天一建设集团有限公司 | Down-hanging construction platform module and construction method of high-altitude large cantilevered steel roof truss |
| CN116623890A (en) * | 2023-05-26 | 2023-08-22 | 苏州金螳螂幕墙有限公司 | A super-long waterproof cantilever support structure for aluminum plate roof |
-
2020
- 2020-07-14 CN CN202021381949.8U patent/CN212406038U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111764623A (en) * | 2020-07-14 | 2020-10-13 | 天津天一建设集团有限公司 | Down-hanging construction platform module and construction method of high-altitude large cantilevered steel roof truss |
| CN111764623B (en) * | 2020-07-14 | 2025-03-25 | 天津天一建设集团有限公司 | Hanging construction platform module and construction method of high altitude large cantilever steel roof frame |
| CN116623890A (en) * | 2023-05-26 | 2023-08-22 | 苏州金螳螂幕墙有限公司 | A super-long waterproof cantilever support structure for aluminum plate roof |
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Granted publication date: 20210126 Effective date of abandoning: 20250325 |