CN114541464B - Novel tower crane foundation lattice column reinforcing device - Google Patents
Novel tower crane foundation lattice column reinforcing device Download PDFInfo
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- CN114541464B CN114541464B CN202210293350.6A CN202210293350A CN114541464B CN 114541464 B CN114541464 B CN 114541464B CN 202210293350 A CN202210293350 A CN 202210293350A CN 114541464 B CN114541464 B CN 114541464B
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- 230000003014 reinforcing effect Effects 0.000 title claims description 11
- 238000005452 bending Methods 0.000 claims abstract description 18
- 230000000712 assembly Effects 0.000 claims abstract description 13
- 238000000429 assembly Methods 0.000 claims abstract description 13
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 230000002787 reinforcement Effects 0.000 abstract description 11
- 238000003466 welding Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 210000005069 ears Anatomy 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/42—Foundations for poles, masts or chimneys
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/44—Foundations for machines, engines or ordnance
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Joining Of Building Structures In Genera (AREA)
Abstract
The invention belongs to the technical field of foundation reinforcement of building hoisting machinery. The device is convenient to install and firm in connection. The technical proposal is as follows: novel tower crane foundation lattice post consolidates device, its characterized in that: the support rod comprises a column holding assembly detachably arranged on the periphery of a lattice column and support rods for connecting the column holding assemblies in pairs; the column holding assembly comprises a clamping plate bent at a right angle and a hoop fixed on the clamping plate and matched with the clamping plate to tighten the lattice column; and ball connecting assemblies connected with the supporting rods are arranged on the adjacent first bending surface and second bending surface of the clamping plate.
Description
Technical Field
The invention belongs to the technical field of foundation reinforcement of building hoisting machinery, and particularly relates to a diagonal bracing reinforcement device for a foundation lattice column of a tower crane.
Background
With the development of society, urban buildings have increasingly larger demands for underground space, the original basement of one layer cannot meet the demands, and the basement of modern urban buildings is generally more than 2 layers. The lower part of a foundation bearing platform of the tower crane in the building site often adopts 4 lattice columns as supports, 4 lattice columns are required to be subjected to diagonal bracing reinforcement along with excavation of a foundation, and the existing reinforcement measures mainly adopt angle steel with corresponding sectional areas for welding reinforcement among the lattice columns for on-site measurement of the size. Because the welding conditions of the construction site are poor, the welding positions are narrow in space and high in welding requirements in high-altitude operation, the reinforcing surfaces of the lattice columns are often not on the same plane, and triangular steel plates are arranged between the angle steel and the lattice columns for reinforcing, the reliability of the welding joints is often not guaranteed; in addition, the stability of the foundation of the tower crane is reduced after the lattice column is excavated, the tower crane is not allowed to be used, continuous operation is usually required for 3-5 days for one-time reinforcement, and a plurality of construction units use the tower crane before the diagonal bracing is not reinforced, so that the potential safety hazard is large. Therefore, reasonable exploration of the diagonal bracing reinforcing device of the foundation lattice column of the tower crane is very necessary.
Disclosure of Invention
The invention aims to overcome the defects of the background technology and provide a novel tower crane foundation lattice column reinforcing device which has the characteristics of convenience in installation and firmness in connection.
The technical scheme provided by the invention is as follows:
novel tower crane foundation lattice post consolidates device, its characterized in that: the support rod comprises a column holding assembly detachably arranged on the periphery of a lattice column and support rods for connecting the column holding assemblies in pairs; the column holding assembly comprises a clamping plate bent at a right angle and a hoop fixed on the clamping plate and matched with the clamping plate to tighten the lattice column; and ball connecting assemblies connected with the supporting rods are arranged on the adjacent first bending surface and second bending surface of the clamping plate.
The support rod comprises an inner support rod and an outer support rod, wherein one end of the inner support rod and one end of the outer support rod are mutually sleeved through a thread pair; the other ends of the inner support rod and the outer support rod are fixedly connected with corresponding ball connecting assemblies.
The ball connecting assembly comprises a spherical block fixed on the clamping plate through a base, a square block movably sleeved on the spherical block and two semi-rings fixedly connected with the square block through a threaded piece; the two semi-rings have the same structure, and the inner walls of the two semi-rings are provided with arc surfaces which are matched with the spherical blocks, so that the two semi-rings can be clamped between the spherical blocks and the base after being combined into a ring shape; and the square block is provided with a hemispherical groove for accommodating the spherical block.
Two outer side planes of the clamping plate are respectively provided with a convex block; the convex block is provided with a first U-shaped groove; the size of the first U-shaped groove is matched with that of the end part of the anchor ear, and the first U-shaped groove penetrates through the protruding block along the length direction, so that the end part of the anchor ear can be conveniently embedded into the first U-shaped groove along the groove depth direction of the first U-shaped groove when the anchor ear is installed; the anchor ear end is positioned in the first U-shaped groove, threads are further formed on the outer peripheral surface of the anchor ear end, and two first nuts matched with the threads and first anti-falling washers matched with the two first nuts are respectively fixed on two side surfaces of the lug, which correspond to two ends of the length direction of the first U-shaped groove.
Two side surfaces of the protruding block, which correspond to two ends of the first U-shaped groove in the length direction, are respectively provided with a first gasket groove, and the shape of the first gasket groove is matched with that of the first anti-drop gasket.
The square block is provided with a second U-shaped groove; the size of the second U-shaped groove is matched with that of the end part of the supporting rod, and the second U-shaped groove penetrates through the square block along the length direction so that the end part of the supporting rod can be conveniently embedded into the second U-shaped groove along the groove depth direction of the second U-shaped groove when the second U-shaped groove is installed; the end part of the support rod is positioned in the second U-shaped groove, external threads are further formed on the peripheral surface of the end part of the support rod, and two second nuts matched with the external threads and second anti-falling washers matched with the external threads are respectively fixed on two side surfaces of the square block, which correspond to two ends of the second U-shaped groove in the length direction.
And second gasket grooves are respectively formed in two side surfaces of the square block, which correspond to the length direction of the second U-shaped groove, and the shape of each second gasket groove is matched with that of each second anti-drop gasket.
A first bending surface of the clamping plate is provided with a group of ball connecting assemblies, and a second bending surface of the clamping plate is provided with three groups of ball connecting assemblies.
The number of the hoops arranged on each clamping plate is not more than four.
The axis of the first gasket groove is coaxial with the axis of the arc surface at the bottom of the first U-shaped groove, so that the first gasket groove forms a first clamping head for preventing the first anti-drop gasket from sliding radially at the groove walls at two sides close to the first U-shaped groove;
the axis of the second gasket groove is coaxial with the axis of the arc surface at the bottom of the second U-shaped groove, so that the second gasket groove forms a second clamping head for preventing the second anti-drop gasket from sliding radially at the groove walls at two sides close to the second U-shaped groove.
The beneficial effects of the invention are as follows:
the invention can strengthen the lattice column, wherein the clamping plates and the anchor ear can be hooped on the lattice column after being matched and connected, and the clamping plates can be connected in pairs through the support rods, thereby realizing the strengthening operation between the lattice columns. The length of the supporting rod is adjustable, and the angle of the square block in the ball connecting assembly is also adjustable, so that the application range of the device is improved. In addition, all can carry out fixed connection through the mode at the embedded in the groove depth direction of U-shaped groove between staple bolt and the splint, between bracing piece and the square piece, not only simple structure is reliable, has greatly made things convenient for the dismouting work moreover, has improved dismouting efficiency, has shortened the reinforcement time limit for a project of lattice column greatly, is fit for popularization and application.
Drawings
Fig. 1 is a schematic perspective view of the present invention mounted on a lattice column.
Fig. 2 is a schematic perspective view of the present invention.
Fig. 3 is a schematic perspective view of the column-holding assembly.
Fig. 4 is a schematic perspective view of the support bar.
Fig. 5 is an exploded view of the ball joint assembly.
Fig. 6 is an enlarged view of a portion a of fig. 2.
Fig. 7 is an enlarged view of a portion B of fig. 3.
Fig. 8 is a schematic diagram of a front view of two half rings combined into a ring.
Fig. 9 is a C-C cross-sectional view of fig. 8.
Fig. 10 is a D-D sectional view of fig. 8.
Reference numerals;
1. a pole holding assembly; 1-1, splints; 1-2, hoops; 1-2-1, a first bending surface; 1-2-2, a second bending surface; 1-3, protruding blocks; 1-3-1, a first U-shaped groove; 1-3-2, a first gasket groove; 1-3-3, a first chuck;
2. a support rod; 2-1, an inner support rod; 2-2, an outer support rod;
3. a ball connection assembly; 3-1, a base; 3-2, spherical blocks; 3-3, square blocks; 3-4, semi-rings; 3-5, hemispherical grooves; 3-6, a second U-shaped groove; 3-7, a second nut; 3-8, a second anti-falling gasket; 3-9, a second gasket groove; 3-10, a second clamping head;
4. lattice columns.
Detailed Description
Further description will be given below of embodiments shown in the drawings.
The novel tower crane foundation lattice column reinforcing device shown in fig. 1 and 2 comprises a column holding assembly 1, a supporting rod 2 and a ball connecting assembly 3.
As shown in fig. 1 to 3, the clasping column assembly is detachably mounted on the outer periphery of the lattice column 4; the column holding assembly comprises a clamping plate 1-1 and a hoop 1-2. The clamping plate adopts a right-angle bent steel plate, wherein two adjacent bending surfaces on the clamping plate are respectively used as a first bending surface 1-2-1 and a second bending surface 1-2-2. The anchor ear is fixed on the splint and cooperates with the splint to tighten the lattice column. Specifically, two outer side planes of the clamping plate are respectively provided with a convex block 1-3, and the convex blocks are provided with first U-shaped grooves 1-3-1; the size of the first U-shaped groove is suitable for the end part of the anchor ear (namely, the radius of the arc surface of the groove bottom of the first U-shaped groove is suitable for the radius of the end part of the anchor ear), and the first U-shaped groove penetrates through the protruding block along the length direction, so that the end part of the anchor ear can be conveniently embedded into the first U-shaped groove along the groove depth direction of the first U-shaped groove. The outer peripheral surface of the end part of the anchor ear is also provided with threads and is provided with two first nuts matched with the threads and first anti-falling washers (the first nuts and the first anti-falling washers are not shown in the figure), and the two first nuts and the two first anti-falling washers are respectively fixed on two side surfaces of the lug corresponding to the two ends of the length direction of the first U-shaped groove. Correspondingly, two side surfaces of the lug corresponding to two ends of the first U-shaped groove in the length direction are respectively provided with a first gasket groove 1-3-2 for filling the first anti-drop gasket; the axis of the first gasket groove is coaxial with the axis of the arc surface of the groove bottom of the first U-shaped groove, so that the first gasket groove forms a first clamping head 1-3-3 at the groove walls at two sides close to the first U-shaped groove to prevent the first anti-drop gasket from sliding radially (see figure 7).
When the anchor ear is installed, the anchor ear end part is sleeved with the first nut and the first anti-falling washer in advance, after the anchor ear end part is embedded into the first U-shaped groove, the first anti-falling washer is filled into the first washer groove on the corresponding side, the first anti-falling washer is radially limited by the first clamping head, the first nut is screwed, the first anti-falling washer is axially limited, and therefore the anchor ear is firmly positioned in the first U-shaped groove, and the anchor ear is prevented from sliding out of the first U-shaped groove.
In addition, in order to further improve the connection reliability of the anchor ear and the clamping plates, a plurality of anchor ears (preferably, the number of anchor ears on each clamping plate is not more than four; two anchor ears are arranged on each clamping plate in the figure) can be arranged on each clamping plate so as to improve the safety performance of the device.
As shown in fig. 1, 2 and 4, the support rods are used for connecting the pole holding assemblies in pairs. The support rod comprises an inner support rod 2-1 and an outer support rod 2-2; one end of the inner support rod and one end of the outer support rod are sleeved through a screw pair, and the length of the inner support rod screwed into the outer support rod can be adjusted according to the distance between the lattice columns, so that different working environments are adapted. The other ends of the inner support rod and the outer support rod are connected to the clamping plate through the ball connecting component.
As shown in fig. 1, 2, 5 and 6, the ball joint assembly comprises a ball block 3-2, a square block 3-3 and two half rings 3-4. The spherical blocks are fixedly welded on the clamping plate through the base 3-1; the square block is provided with a hemispherical groove 3-5 for accommodating the spherical block; the two half rings are fixedly connected with the square block through screw members (bolts can be adopted, and are not shown in the figure). The two semi-rings have the same structure and the inner walls are provided with arc surfaces which are matched with the spherical blocks, so that the two semi-rings can be clamped between the spherical blocks and the base after being combined into a ring shape (see fig. 8-10). When the semi-ring type spherical ball joint is in operation, the square block is sleeved on the spherical block through the semi-spherical groove, and then the two semi-rings are combined into a ring shape and fixed on the square block through bolts, so that the two semi-rings are clamped between the spherical block and the base. At this time, the spherical space formed by enclosing the arc surfaces of the inner walls of the two semi-rings and the hemispherical grooves is just suitable for the size of the spherical block, and under the enclosing effect of the two semi-rings, the spherical block cannot be separated from the hemispherical grooves, so that the support rod can swing a plurality of angles in any direction around the axis of the spherical block while connecting the square block and the spherical block into a whole, and the convenience of installation work is remarkably improved.
The square block is provided with a second U-shaped groove 3-6, the size of the second U-shaped groove is matched with the end part of the supporting rod (namely, the radius of the arc surface of the bottom of the second U-shaped groove is matched with the radius of the end part of the supporting rod), and the second U-shaped groove penetrates through the square block along the length direction, so that the end part of the supporting rod can be conveniently embedded into the second U-shaped groove along the depth direction of the second U-shaped groove. The outer peripheral surface of the end part of the support rod is also provided with external threads, and is provided with two second nuts 3-7 matched with the external threads and second anti-drop washers 3-8 matched with the external threads, and the two second nuts and the two second anti-drop washers are respectively fixed on two side surfaces of the square block, which correspond to two ends of the second U-shaped groove in the length direction. Correspondingly, two side surfaces of the square block, which correspond to two ends of the second U-shaped groove in the length direction, are respectively provided with a second gasket groove 3-9 for filling a second anti-drop gasket; the axis of the second gasket groove is coaxial with the axis of the arc surface of the bottom of the second U-shaped groove, so that the second gasket groove forms second clamping heads 3-10 at the groove walls of two sides close to the second U-shaped groove to prevent the second anti-drop gasket from sliding radially.
When the support rod is connected, the support rod is adjusted to a proper length, and a second nut and a second anti-falling washer are sleeved at the end part of the support rod in advance. After the end part of the supporting rod is embedded into the second U-shaped groove, the second anti-falling gasket is filled into the second gasket groove, the second anti-falling gasket is radially limited by the second clamping head, the second nut is screwed, the second anti-falling gasket is axially limited, and therefore the supporting rod is firmly positioned in the second U-shaped groove, and the supporting rod is prevented from sliding out of the second U-shaped groove. The square block and the supporting rod are connected in a similar manner, and the clamping plates and the anchor clamps are connected in a similar manner, so that the square block and the anchor clamps have the advantages of being reliable in connection and convenient to assemble and disassemble, and the reinforcement period of the lattice column can be greatly shortened.
In this embodiment, a set of ball connection assemblies is disposed on a first bending surface of the clamping plate, and three sets of ball connection assemblies (distributed vertically) are disposed on a second bending surface of the clamping plate. When the lattice column is in operation, the second bending surface can be connected with three supporting rods, so that diagonal bracing reinforcement is conveniently carried out on the lattice column, and the reinforcement effect is improved; in addition, as the square block and the spherical block are movable, the angle of the square block is convenient to adjust, and the application range of the device is improved.
Finally, it should be noted that the above list is only specific embodiments of the present invention. Obviously, the invention is not limited to the above embodiments, but many variations are possible. All modifications directly derived or suggested to one skilled in the art from the present disclosure should be considered as being within the scope of the present invention.
Claims (5)
1. Novel tower crane foundation lattice post consolidates device, its characterized in that: comprises a embracing column component (1) which is detachably arranged at the periphery of a lattice column (4) and a supporting rod (2) which connects the embracing column components in pairs; the column holding assembly comprises a clamping plate (1-1) bent at a right angle and a hoop (1-2) fixed on the clamping plate and matched with the clamping plate to tighten the lattice column; ball connecting components connected with supporting rods are arranged on the adjacent first bending surface (1-2-1) and second bending surface (1-2-2) on the clamping plate;
the support rod comprises an inner support rod (2-1) and an outer support rod (2-2) which are sleeved with each other at one end through a thread pair; the other ends of the inner support rod and the outer support rod are fixedly connected with corresponding ball connecting assemblies;
the ball connecting assembly comprises a spherical block (3-2) fixed on the clamping plate through a base (3-1), a square block (3-3) movably sleeved on the spherical block, and two semi-rings (3-4) fixedly connected with the square block through a threaded piece; the two semi-rings have the same structure, and the inner walls of the two semi-rings are provided with arc surfaces which are matched with the spherical blocks, so that the two semi-rings can be clamped between the spherical blocks and the base after being combined into a ring shape; the square block is provided with a hemispherical groove (3-5) for accommodating the spherical block;
two outer side planes of the clamping plate are respectively provided with a lug (1-3); the bump is provided with a first U-shaped groove (1-3-1); the size of the first U-shaped groove is matched with that of the end part of the anchor ear, and the first U-shaped groove penetrates through the protruding block along the length direction, so that the end part of the anchor ear can be conveniently embedded into the first U-shaped groove along the groove depth direction of the first U-shaped groove when the anchor ear is installed; the hoop end is positioned in the first U-shaped groove, threads are further formed on the peripheral surface of the hoop end, and two first nuts matched with the threads and first anti-falling washers matched with the first nuts are respectively fixed on two side surfaces of the lug corresponding to two ends of the first U-shaped groove in the length direction;
two side surfaces of the protruding block, which correspond to two ends of the first U-shaped groove in the length direction, are respectively provided with a first gasket groove (1-3-2), and the shape of the first gasket groove is matched with that of the first anti-drop gasket;
the square block is provided with a second U-shaped groove (3-6); the size of the second U-shaped groove is matched with that of the end part of the supporting rod, and the second U-shaped groove penetrates through the square block along the length direction so that the end part of the supporting rod can be conveniently embedded into the second U-shaped groove along the groove depth direction of the second U-shaped groove when the second U-shaped groove is installed; the end part of the support rod is positioned in the second U-shaped groove, threads are further formed on the peripheral surface of the end part of the support rod, and two second nuts (3-7) matched with the threads and second anti-falling washers (3-8) matched with the two second nuts are respectively fixed on two side surfaces of the square block, which correspond to two ends of the second U-shaped groove in the length direction.
2. The novel tower crane foundation lattice column reinforcing device according to claim 1, wherein: two side surfaces of the square block, which correspond to the length direction of the second U-shaped groove, are respectively provided with a second gasket groove (3-9), and the shape of the second gasket groove is matched with that of the second anti-drop gasket.
3. The novel tower crane foundation lattice column reinforcing device according to claim 2, wherein: a first bending surface of the clamping plate is provided with a group of ball connecting assemblies, and a second bending surface of the clamping plate is provided with three groups of ball connecting assemblies.
4. The novel tower crane foundation lattice column reinforcing device according to claim 3, wherein: the number of the hoops arranged on each clamping plate is not more than four.
5. The novel tower crane foundation lattice column reinforcing device according to claim 4, wherein: the axis of the first gasket groove is coaxial with the axis of the arc surface at the bottom of the first U-shaped groove, so that the first gasket groove forms a first clamping head (1-3-3) for preventing the first anti-drop gasket from sliding radially at the groove walls at two sides close to the first U-shaped groove;
the axis of the second gasket groove is coaxial with the axis of the arc surface of the bottom of the second U-shaped groove, so that the second gasket groove forms a second clamping head (3-10) for preventing the second anti-drop gasket from sliding radially at the groove walls at two sides close to the second U-shaped groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210293350.6A CN114541464B (en) | 2022-03-24 | 2022-03-24 | Novel tower crane foundation lattice column reinforcing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210293350.6A CN114541464B (en) | 2022-03-24 | 2022-03-24 | Novel tower crane foundation lattice column reinforcing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114541464A CN114541464A (en) | 2022-05-27 |
| CN114541464B true CN114541464B (en) | 2023-12-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210293350.6A Active CN114541464B (en) | 2022-03-24 | 2022-03-24 | Novel tower crane foundation lattice column reinforcing device |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203307836U (en) * | 2013-06-13 | 2013-11-27 | 浙江大学城市学院 | Tower crane pile reinforcing structure |
| CN204590059U (en) * | 2015-01-23 | 2015-08-26 | 福建开辉机械工程有限公司 | A kind of combined type tower-crane foundation structure |
| CN109775586A (en) * | 2019-03-14 | 2019-05-21 | 安徽宏志建设工程有限责任公司 | A kind of removable steel hoop pile derrick crane |
| KR102165225B1 (en) * | 2020-05-25 | 2020-10-13 | 이미영 | Joint bracket |
| KR102216052B1 (en) * | 2020-09-14 | 2021-02-17 | 주식회사 미로 | Angle-adjustable railing structure that prevents the rotation of the crossbar |
| CN215801771U (en) * | 2021-07-09 | 2022-02-11 | 浙江省特种设备科学研究院 | Portable reinforcing apparatus of tower crane basis lattice column |
-
2022
- 2022-03-24 CN CN202210293350.6A patent/CN114541464B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203307836U (en) * | 2013-06-13 | 2013-11-27 | 浙江大学城市学院 | Tower crane pile reinforcing structure |
| CN204590059U (en) * | 2015-01-23 | 2015-08-26 | 福建开辉机械工程有限公司 | A kind of combined type tower-crane foundation structure |
| CN109775586A (en) * | 2019-03-14 | 2019-05-21 | 安徽宏志建设工程有限责任公司 | A kind of removable steel hoop pile derrick crane |
| KR102165225B1 (en) * | 2020-05-25 | 2020-10-13 | 이미영 | Joint bracket |
| KR102216052B1 (en) * | 2020-09-14 | 2021-02-17 | 주식회사 미로 | Angle-adjustable railing structure that prevents the rotation of the crossbar |
| CN215801771U (en) * | 2021-07-09 | 2022-02-11 | 浙江省特种设备科学研究院 | Portable reinforcing apparatus of tower crane basis lattice column |
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| CN114541464A (en) | 2022-05-27 |
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