CN112408217A - Tower standard section, expandable tower and vertical bearing capacity reinforcing tower - Google Patents
Tower standard section, expandable tower and vertical bearing capacity reinforcing tower Download PDFInfo
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- CN112408217A CN112408217A CN202011419076.XA CN202011419076A CN112408217A CN 112408217 A CN112408217 A CN 112408217A CN 202011419076 A CN202011419076 A CN 202011419076A CN 112408217 A CN112408217 A CN 112408217A
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- standard
- tower
- standard knot
- fixedly connected
- gusset plate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/72—Counterweights or supports for balancing lifting couples
- B66C23/78—Supports, e.g. outriggers, for mobile cranes
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Abstract
The invention relates to a standard section of a tower frame, an expandable tower frame and a vertical bearing capacity reinforced tower frame, wherein the standard section of the tower frame comprises four standard section stand columns and a plurality of stand column connecting pieces, the standard section stand columns are vertically arranged to form a rectangular standard section frame, adjacent standard section stand columns are fixedly connected through the stand column connecting pieces, each standard section stand column comprises a standard stand column main body, connecting plates are fixedly arranged on the top surface and the bottom surface of the standard stand column main body, node plates for lateral expansion are arranged on the side surfaces of the standard stand column main body, and the expandable tower frame and the vertical bearing capacity reinforced tower frame are built based on the standard section of the tower frame. Compared with the prior art, the tower frame standard knot structure can not be damaged, the tower frame standard knot structure can be used repeatedly, the economic cost is reduced, the expandable pieces are connected through bolts, the precision is high, the installation is convenient, and the bearing capacity is strong.
Description
Technical Field
The invention relates to the field of expandable towers, in particular to a standard section, an expandable tower and a vertical bearing capacity reinforcing tower of a tower.
Background
The tower frame is widely applied in the technical field of engineering, particularly the construction field. Such towers are often assembled from standard knots and are commonly used for project rentals. In case the tower form (length, width, height and its specification) is fixed, its bearing capacity is fixed. In construction, sometimes the applied tower is often insufficient in bearing capacity, a temporary reinforcing method is adopted, the reinforcing form is difficult and high in risk, a welding connection form is often adopted, and structural damage can be caused to the reusable tower.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a standard tower section, an expandable tower and a vertical bearing capacity reinforcing tower.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides a pylon standard festival, includes four standard festival stands and a plurality of stand connecting pieces, the vertical setting of standard festival stand form rectangular bodily form standard festival frame, adjacent standard festival stand passes through stand connecting piece fixed connection, every standard festival stand include standard stand main part, the fixed connecting plate that is equipped with in top surface and the bottom surface of standard stand main part, the side of standard stand main part be equipped with the gusset plate that is used for the side direction extension.
Preferably, the gusset plates are arranged along the standard upright post body at different heights.
Preferably, the gusset plate includes middle part gusset plate, top gusset plate and bottom gusset plate, the fixed middle part side of locating the standard stand main part of middle part gusset plate, the top gusset plate locate the top side of standard stand main part, the bottom gusset plate locate the bottom side of standard stand main part.
Preferably, the gusset plate is provided with an inclined rod pin hole and a cross rod screw hole.
Preferably, each of said standard joint studs comprises two middle gusset plates, two top gusset plates and two bottom gusset plates. In every standard festival stand, the contained angle of two middle part gusset plates is 90 degrees, and the contained angle of two top gusset plates is 90 degrees, and the contained angle of two bottom gusset plates is 90 degrees, and the vertical position of middle part gusset plate, top gusset plate, bottom gusset plate is the same.
Preferably, each of the upright post connecting pieces comprises four standard section upper cross bars, four standard section middle cross bars and four standard section lower cross bars, the top ends of the standard section upright posts are fixedly connected through the standard section upper cross bars to form a rectangular frame, the middle parts of the standard section upright posts are fixedly connected through the standard section middle cross bars to form a rectangular frame, and the bottom ends of the standard section upright posts are fixedly connected through the standard section lower cross bars to form a rectangular frame.
Preferably, the column connection spare still include four down tube subassemblies, four down tube subassemblies locate respectively on four sides of pylon standard festival, the down tube subassembly include standard festival down tube and standard festival down tube, the top of last standard festival down tube and the top fixed connection of standard festival stand, the bottom of last standard festival down tube and the middle part fixed connection of adjacent standard festival stand, the bottom of lower standard festival down tube and the bottom fixed connection of standard festival stand, the top of lower standard festival down tube and the middle part fixed connection of standard festival stand.
An expandable tower comprises a plurality of tower standard knots, the tower standard knots are vertically arranged and connected to form the expandable tower, and the top surface and the bottom surface of each tower standard knot are sequentially and fixedly connected through connecting plates.
Preferably, the expandable tower further comprises connecting bolts, and the adjacent connecting plates are fixedly connected through the connecting bolts.
Preferably, the expandable tower further comprises stay cables symmetrically arranged on two sides of the expandable tower, the bottoms of the stay cables are connected with the ground, and the tops of the stay cables are fixedly connected with the middle node plate, the top node plate or the bottom node plate.
The utility model provides a pylon is strengthened to vertical bearing capacity, includes a plurality of foretell pylon standard festival, the top surface and the bottom surface of pylon standard festival pass through connecting plate fixed connection in proper order, the both sides of every pylon standard festival are equipped with a horizontal expansion piece respectively, horizontal expansion piece pass through gusset plate and pylon standard festival fixed connection.
Preferably, each horizontal expansion piece comprises two expansion piece upright columns, six first expansion horizontal rods and three second expansion horizontal rods, each expansion piece upright column comprises an expansion upright column main body, two middle node plates, two top end node plates and two bottom end node plates, the middle node plates are arranged on the middle side surfaces of the expansion upright column main body, the top end node plates are arranged on the top end side surfaces of the expansion upright column main body, the bottom end node plates are arranged on the bottom end side surfaces of the expansion upright column main body,
the first expanding horizontal rod is arranged between the standard upright post main body and the expanding upright post main body, the end part of the first expanding horizontal rod is respectively connected with the middle node plate, the top node plate and the bottom node plate on the standard upright post main body and the expanding upright post main body,
the second expansion horizontal rod is arranged between the two expansion upright post main bodies, and the end part of the second expansion horizontal rod is respectively connected with the middle node plate, the top node plate and the bottom node plate on the two expansion upright post main bodies.
Preferably, the middle gusset plate, the top gusset plate and the bottom gusset plate are provided with diagonal pin holes, the front side and the rear side of the horizontal expansion piece are provided with flexible pull rod assemblies, each flexible pull rod assembly comprises four flexible pull rods, two flexible pull rods are arranged on the upper part of the side surface of the horizontal expansion piece in a crossed manner, the other two flexible pull rods are arranged on the lower part of the side surface of the horizontal expansion piece in a crossed manner, and the end parts of the flexible pull rods are fixedly connected with the diagonal pin holes.
Compared with the prior art, the invention has the following advantages:
(1) the side surface of the standard upright post main body of the tower standard knot is provided with the middle node plate, the top end node plate and the bottom end node plate, so that the tower standard knot can be structurally expanded by utilizing the middle node plate, the top end node plate and the bottom end node plate, and is connected with other expansion structures by utilizing the components, thereby effectively improving the expansibility of the tower standard knot;
(2) the standard section upright post of the tower standard section effectively improves the strength of the tower standard section by the upright post connecting piece which comprises a plurality of cross rods and inclined rod components;
(3) the connecting plates are arranged at the top and the bottom of the standard tower section, so that the standard tower section can be conveniently expanded and connected up and down;
(4) the expandable tower frame composed of the tower frame standard knot can be structurally expanded by utilizing the middle node plate, the top end node plate and the bottom end node plate on the tower frame standard knot, the purpose of improving the vertical bearing capacity can be achieved by adding the horizontal expansion piece, and the function of improving the lateral bearing capacity can be achieved by adding the cable wind;
(5) according to the tower with the enhanced vertical bearing capacity, the horizontal expansion parts are added on the two sides of the tower standard part based on the tower standard part, so that the vertical bearing capacity of the tower is improved, and the tower is connected by bolts, high in precision and convenient to install;
(6) the horizontal expansion piece can be fixed by using a cross rod and a flexible pull rod, so that the stability is strong, and the vertical bearing capacity of the tower frame is effectively improved.
Drawings
FIG. 1 is a schematic structural view of a tower standard knot of the present invention;
FIG. 2 is a schematic top view of a tower modular segment according to the present invention;
FIG. 3 is a schematic structural view of a standard knot column of the present invention;
FIG. 4 is a schematic structural view of a middle gusset plate of the present invention;
FIG. 5 is a schematic structural view of a top gusset plate of the present invention;
FIG. 6 is a schematic structural view of a bottom gusset plate of the present invention;
FIG. 7 is a schematic structural view of an expandable tower of the present invention;
FIG. 8 is a partial structural schematic view of an expandable tower of the present invention;
FIG. 9 is a schematic view of the vertical load enhancement tower of the present invention;
FIG. 10 is a schematic view of the construction of one tower standard knot and its two side horizontal extensions in the vertical load enhancement tower of the present invention;
FIG. 11 is a schematic top view of the vertical load enhancement tower of the present invention;
FIG. 12 is a schematic structural view of an expandable tower with stay cables according to the present invention;
fig. 13 is a structural schematic diagram of a portal frame based on an expandable tower.
The system comprises a standard upright post main body, a middle node plate, a top node plate, a bottom node plate, a connecting plate, a diagonal rod pin hole, a cross rod screw hole, a standard section upper cross rod, a standard section middle cross rod, a standard section lower cross rod, a standard section diagonal rod, a standard section 12, a standard section diagonal rod, a tower standard section 13, a tower standard section 14, a horizontal expansion piece, a standard section expansion upright post main body 15, an expansion upright post main body 16, a first expansion horizontal rod, a second expansion horizontal rod, a diagonal cable 18, a diagonal cable 19, a hoisting girder, a truss 20, a truss 21 and a flexible pull rod.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. Note that the following description of the embodiments is merely a substantial example, and the present invention is not intended to be limited to the application or the use thereof, and is not limited to the following embodiments.
Examples
The utility model provides a pylon standard festival, is shown as figure 1 ~ 3, includes four standard festival stands and a plurality of stand connecting piece, and the vertical setting of standard festival stand forms rectangular bodily form standard festival frame, and adjacent standard festival stand passes through stand connecting piece fixed connection, every standard festival stand include standard stand main part 1, and the top surface and the bottom surface of standard stand main part 1 are fixed and are equipped with connecting plate 5, and the side of standard stand main part 1 is equipped with the gusset plate that is used for the side direction extension.
In order to facilitate the installation and connection of the gusset plate, the gusset plate is arranged along the standard upright post main body 1 at different heights. In addition, the gusset plate is provided with a diagonal pin hole 6 and a horizontal rod screw hole 7 for lateral expansion.
In this embodiment, the gusset plate includes middle part gusset plate 2, top gusset plate 3 and bottom gusset plate 4, and the middle part side of standard stand main part 1 is fixed to middle part gusset plate 2, and the top side of standard stand main part 1 is located to top gusset plate 3, and the bottom side of standard stand main part 1 is located to bottom gusset plate 4.
Further, in this embodiment, in order to expand the structure of the tower standard knot 13 in all directions, each standard knot column includes two middle gusset plates 2, two top gusset plates 3, and two bottom gusset plates 4.
Moreover, as shown in fig. 4 to 6, in order to facilitate connection and fixation of the middle gusset plate 2, the top gusset plate 3, and the bottom gusset plate 4 with the expanding structure, the middle gusset plate 2, the top gusset plate 3, and the bottom gusset plate 4 are all provided with an inclined rod pin hole 6 and a cross rod screw hole 7.
In this embodiment, in every standard festival stand, the contained angle of two middle part gusset plates 2 is 90 degrees, and the contained angle of two top gusset plates 3 is 90 degrees, and the contained angle of two bottom gusset plates 4 is 90 degrees, and the vertical position of middle part gusset plate 2, top gusset plate 3, bottom gusset plate 4 is the same.
In this embodiment, in order to improve the joint strength of the standard sections of the tower, each upright post connecting piece includes four standard section upper cross bars 8, four standard section middle cross bars 9 and four standard section lower cross bars 10, the top ends of the standard section upright posts are fixedly connected through the standard section upper cross bars 8 to form a rectangular frame, the middle portions of the standard section upright posts are fixedly connected through the standard section middle cross bars 9 to form the rectangular frame, and the bottom ends of the standard section upright posts are fixedly connected through the standard section lower cross bars 10 to form the rectangular frame.
In this embodiment, in order to further improve the joint strength of tower standard festival, the column connection spare still includes four down tube subassemblies, four down tube subassemblies are located respectively on four sides of tower standard festival 13, the down tube subassembly includes standard festival down tube 11 and lower standard festival down tube 12, the top of going up standard festival down tube 11 and the top fixed connection of standard festival stand, the bottom of going up standard festival down tube 11 and the middle part fixed connection of adjacent standard festival stand, the bottom of lower standard festival down tube 12 and the bottom fixed connection of standard festival stand, the top of lower standard festival down tube 12 and the middle part fixed connection of standard festival stand.
In the tower standard knot 13, a middle node plate 2, a top node plate 3 and a bottom node plate 4 can be directly welded and fixed on the side surface of a standard upright post main body 1, and an upright post connecting piece can be fixedly connected with an upright post of the standard knot in a welding or connecting piece mode.
An expandable tower frame is shown in fig. 7 and 8 and comprises a plurality of tower frame standard sections 13, the tower frame standard sections 13 are vertically arranged and connected to form the expandable tower frame, and the top surfaces and the bottom surfaces of the tower frame standard sections 13 are sequentially and fixedly connected through connecting plates 5.
In particular, for the expandable tower, the expandable tower further comprises connecting bolts, and the adjacent connecting plates 5 are fixedly connected through the connecting bolts.
In one embodiment of the invention, the connecting plates 5 are flange plates in order to facilitate the connection between the standard tower sections 13.
In addition, in an embodiment of the invention, in order to improve the lateral bearing capacity of the tower, the expandable tower further comprises stay cables 18 symmetrically arranged on two sides of the expandable tower, the bottoms of the stay cables 18 are connected with the ground, and the tops of the stay cables 18 are fixedly connected with the middle node plate 2, the top node plate 3 or the bottom node plate 4.
Specifically, as shown in fig. 12, the expandable tower includes four stay cables, two of which have tops fixedly connected to the middle gusset plate 2 and bottoms fixedly connected to the ground, and the other two have tops fixedly connected to the bottom gusset plate 4 and bottoms fixedly connected to the ground.
A tower for strengthening vertical bearing capacity is disclosed, as shown in fig. 9-11, and comprises a plurality of tower standard joints 13, wherein the top surfaces and the bottom surfaces of the tower standard joints 13 are sequentially and fixedly connected through connecting plates 5, two sides of each tower standard joint 13 are respectively provided with a horizontal expansion piece 14, and the horizontal expansion pieces 14 are fixedly connected with the tower standard joints (13) through node plates.
Specifically, in this embodiment, each horizontal extension member 14 includes two extension member columns, six first extension horizontal rods 16 and three second extension horizontal rods 17, and each extension member column includes an extension column main body 15, two middle node plates 2, two top node plates 3 and two bottom node plates 4, where the middle node plate 2 is located on a middle side of the extension column main body 15, the top node plate 3 is located on a top side of the extension column main body 15, and the bottom node plate 4 is located on a bottom side of the extension column main body 15.
Further, the first expanding horizontal rod 16 is arranged between the standard upright post main body 1 and the expanding upright post main body 15, and the end part of the first expanding horizontal rod 16 is connected with the middle node plate 2, the top node plate 3 and the bottom node plate 4 on the standard upright post main body 1 and the expanding upright post main body 15 respectively.
As shown in fig. 10 and 11, one end of the first extended horizontal rod 16 located at the upper part is fixedly connected with the cross rod screw hole 7 on the top gusset plate 3 on the standard upright main body 1, and the other end is fixedly connected with the cross rod screw hole 7 on the top gusset plate 3 on the extended upright main body 15; one end of a first expanded horizontal rod 16 positioned in the middle is fixedly connected with a cross rod screw hole 7 on a middle gusset plate 2 on the standard upright post main body 1, and the other end is fixedly connected with a cross rod screw hole 7 on the middle gusset plate 2 on an expanded upright post main body 15; one end of the first expanding horizontal rod 16 at the bottom is fixedly connected with the bottom end gusset plate 4 on the standard upright post body 1, and the other end is fixedly connected with the bottom end gusset plate 4 on the expanding upright post body 15.
Further, the second expansion horizontal rod 17 is arranged between the two expansion upright post main bodies 15, and the end part of the second expansion horizontal rod 17 is connected with the middle gusset plate 2, the top gusset plate 3 and the bottom gusset plate 4 on the two expansion upright post main bodies 15 respectively.
As shown in fig. 11, both ends of the second expanding horizontal rod 17 at the upper part are respectively fixedly connected with the cross rod screw holes 7 on the top gusset plate 3 on the two expanding upright post main bodies 15; two ends of a second expanding horizontal rod 17 positioned in the middle are respectively and fixedly connected with cross rod screw holes 7 on the middle gusset plates 2 on the two expanding upright post main bodies 15; two ends of a second expanding horizontal rod 17 positioned at the bottom are respectively and fixedly connected with cross rod screw holes 7 on bottom end node plates 4 on two expanding upright post main bodies 15.
In addition, in order to further stably reinforce the horizontal extension member 14, the middle gusset plate 2, the top gusset plate 3 and the bottom gusset plate 4 are provided with diagonal rod pin holes 6, the front side and the rear side of the horizontal extension member 14 are provided with flexible pull rod assemblies, each flexible pull rod assembly comprises four flexible pull rods 21, two of the flexible pull rods 21 are crosswise arranged at the upper part of the side surface of the horizontal extension member 14, the other two flexible pull rods 21 are crosswise arranged at the lower part of the side surface of the horizontal extension member 14, and the end parts of the flexible pull rods 21 are fixedly connected with the diagonal rod pin holes 6.
In another embodiment of the tower standard knot of the present invention, a mast is constructed using the tower standard knot. The portal frame comprises a plurality of tower standard sections 13, a truss 20 and a hoisting girder 19, the top surfaces and the bottom surfaces of the tower standard sections 13 are sequentially and fixedly connected through a connecting plate 5, two expandable towers with the same height are built, two ends of the bottom surface of the hoisting girder 19 are respectively and fixedly connected with the top surfaces of the two expandable towers, the truss 20 is arranged between the two tower standard sections, and two ends of the truss 20 are fixedly connected with the two expandable towers through a middle node plate 2, a top node plate 3 and a bottom node plate 4.
In this embodiment, as shown in fig. 13, two ends of the truss 20 are fixedly connected to the two expandable towers through the middle node plate 2 and the top node plate 3, and the truss 20 includes truss horizontal rods and truss diagonal rods disposed between the truss horizontal rods.
The above embodiments are merely examples and do not limit the scope of the present invention. These embodiments may be implemented in other various manners, and various omissions, substitutions, and changes may be made without departing from the technical spirit of the present invention.
Claims (10)
1. The utility model provides a pylon standard knot, its characterized in that includes four standard festival stands and a plurality of stand connecting piece, the vertical setting of standard festival stand form rectangular bodily form standard festival frame, adjacent standard festival stand passes through stand connecting piece fixed connection, every standard festival stand include standard stand main part (1), the top surface and the bottom surface of standard stand main part (1) fixed be equipped with connecting plate (5), the side of standard stand main part (1) be equipped with the gusset plate that is used for the side direction extension.
2. A tower standard knot according to claim 1, characterised in that the gusset plates are arranged at different heights along the standard post body (1).
3. The tower standard knot of claim 2, wherein the gusset plates comprise a middle gusset plate (2), a top gusset plate (3) and a bottom gusset plate (4), the middle gusset plate (2) is fixedly arranged on the middle side surface of the standard upright main body (1), the top gusset plate (3) is arranged on the top side surface of the standard upright main body (1), and the bottom gusset plate (4) is arranged on the bottom side surface of the standard upright main body (1).
4. A tower standard knot according to claim 1, characterized in that the gusset plate is provided with a diagonal pin hole (6) and a cross bar screw hole (7).
5. The tower standard knot of claim 1, wherein each upright post connecting piece comprises four standard knot upper cross rods (8), four standard knot middle cross rods (9) and four standard knot lower cross rods (10), the top ends of the standard knot upright posts are fixedly connected through the standard knot upper cross rods (8) to form a rectangular frame, the middle parts of the standard knot upright posts are fixedly connected through the standard knot middle cross rods (9) to form a rectangular frame, and the bottom ends of the standard knot upright posts are fixedly connected through the standard knot lower cross rods (10) to form a rectangular frame.
6. The tower standard knot of claim 5, wherein the column connecting member further comprises four diagonal bar assemblies, the four diagonal bar assemblies are respectively arranged on four sides of the tower standard knot (13), each diagonal bar assembly comprises an upper standard knot diagonal bar (11) and a lower standard knot diagonal bar (12), the top end of the upper standard knot diagonal bar (11) is fixedly connected with the top end of the standard knot column, the bottom end of the upper standard knot diagonal bar (11) is fixedly connected with the middle part of the adjacent standard knot column, the bottom end of the lower standard knot diagonal bar (12) is fixedly connected with the bottom end of the standard knot column, and the top part of the lower standard knot diagonal bar (12) is fixedly connected with the middle part of the standard knot column.
7. An expandable tower, characterized in that, comprises a plurality of tower standard knots (13) of any one of claims 1-6, the tower standard knots (13) are vertically arranged and connected to form the expandable tower, and the top surface and the bottom surface of the tower standard knots (13) are sequentially and fixedly connected through a connecting plate (5).
8. An expandable tower according to claim 7, characterised in that it further comprises connecting bolts by which adjacent connecting plates (5) are fixedly connected.
9. An expandable tower frame according to claim 7, further comprising stay cables (18) symmetrically arranged at two sides of the expandable tower frame, wherein the bottoms of the stay cables (18) are connected with the ground, and the tops of the stay cables (18) are fixedly connected with the gusset plate.
10. A tower with enhanced vertical bearing capacity, characterized in that, it comprises a plurality of tower standard joints (13) as claimed in any one of claims 1 to 6, the top and bottom surfaces of the tower standard joints (13) are sequentially and fixedly connected by connecting plates (5), two sides of each tower standard joint (13) are respectively provided with a horizontal extension piece (14), and the horizontal extension pieces (14) are fixedly connected with the tower standard joints (13) by node plates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011419076.XA CN112408217A (en) | 2020-12-07 | 2020-12-07 | Tower standard section, expandable tower and vertical bearing capacity reinforcing tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011419076.XA CN112408217A (en) | 2020-12-07 | 2020-12-07 | Tower standard section, expandable tower and vertical bearing capacity reinforcing tower |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112408217A true CN112408217A (en) | 2021-02-26 |
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ID=74776694
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011419076.XA Pending CN112408217A (en) | 2020-12-07 | 2020-12-07 | Tower standard section, expandable tower and vertical bearing capacity reinforcing tower |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112408217A (en) |
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2020
- 2020-12-07 CN CN202011419076.XA patent/CN112408217A/en active Pending
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