CN113955667A - Steel structure processing lifting machine - Google Patents

Steel structure processing lifting machine Download PDF

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Publication number
CN113955667A
CN113955667A CN202111371067.2A CN202111371067A CN113955667A CN 113955667 A CN113955667 A CN 113955667A CN 202111371067 A CN202111371067 A CN 202111371067A CN 113955667 A CN113955667 A CN 113955667A
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CN
China
Prior art keywords
plate
connecting plate
connecting piece
movable
rack
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Granted
Application number
CN202111371067.2A
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Chinese (zh)
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CN113955667B (en
Inventor
夏敏
孙洪伟
陈霆
洪明明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wuhu Tianhang Heavy Industry Co Ltd
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Wuhu Tianhang Heavy Industry Co Ltd
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Priority to CN202111371067.2A priority Critical patent/CN113955667B/en
Publication of CN113955667A publication Critical patent/CN113955667A/en
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Publication of CN113955667B publication Critical patent/CN113955667B/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66FHOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F7/00Lifting frames, e.g. for lifting vehicles; Platform lifts
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66FHOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F7/00Lifting frames, e.g. for lifting vehicles; Platform lifts
    • B66F7/28Constructional details, e.g. end stops, pivoting supporting members, sliding runners adjustable to load dimensions

Abstract

The application provides steel construction processing lifting machine, including first connecting piece, wall body and steelframe, the inside movable mounting of first connecting piece first half has the second connecting piece, the fixed third connecting piece that is provided with in bottom of first connecting piece, the inside slidable mounting of third connecting piece front side has first fly leaf, the inside slidable mounting of third connecting piece rear side has the second fly leaf, supporting component is all installed to the inside of first fly leaf and second fly leaf, the intercommunication groove has all been seted up on the surface of first fly leaf and second fly leaf, first connecting piece, second connecting piece and third connecting piece integral mounting are in the side of wall body, the front end of third connecting piece is provided with the steelframe. This application is through three connecting pieces and the telescopic link that sets up for the whole occupation space of the device is less, can adapt to the river course bank protection and use, has promoted the application scope of device, but also can go up and down to not unidimensional steel construction.

Description

Steel structure processing lifting machine
Technical Field
The invention relates to the field of steel structure processing, in particular to a steel structure processing hoister.
Background
The steel structure is a common structural part in building construction, a hoist is required to be used in the welding, fixing and processing process of the steel structure, the main function of the hoist is to stably fix and adjust the height of the steel structure, but the existing steel structure hoist has some defects when in use;
current steel construction lifting machine is not suitable for the river course bank protection and uses when using, can use the steel construction usually during the river course bank protection construction, but can weld again because the insecure scheduling problem of welding when in actual use, at this moment need the hoist to hoist the steel construction to the work area again, and is very troublesome, can not directly place the lifting machine and use at the river course edge.
Therefore, the improvement is made, and the steel structure processing hoister is provided.
Disclosure of Invention
The invention aims to: present lifting machine to existence at present is not suitable for the river course bank protection and uses, can use the steel construction usually during the river course bank protection construction, but can weld again because of welding insecure scheduling problem when in actual use, at this moment need the hoist to hoist the steel construction to the work area again, and is very troublesome, can not directly place the lifting machine and carry out the problem of using at the river course edge.
In order to achieve the above purpose, the invention provides the following technical scheme:
the steel structure processing lifting machine aims to solve the problems.
The present application is specifically such that:
including first connecting piece, wall body and steelframe, the inside movable mounting of first connecting piece first half has the second connecting piece, the fixed third connecting piece that is provided with in bottom of first connecting piece, the inside slidable mounting of third connecting piece front side has first fly leaf, the inside slidable mounting of third connecting piece rear side has the second fly leaf, supporting component is all installed to the inside of first fly leaf and second fly leaf, the intercommunication groove has all been seted up on the surface of first fly leaf and second fly leaf, first connecting piece, second connecting piece and third connecting piece integral erection are in the side of wall body, the front end of third connecting piece is provided with the steelframe.
As a preferred technical solution of the present application, the first connecting member includes a first connecting plate, a first chute, a top plate, and a first telescopic rod; the middle of the first connecting plate is in an opening shape, a first sliding groove is formed in the first connecting plate, a top plate is fixedly arranged at the top of the first connecting plate, and a first telescopic rod is fixedly arranged at the rear side of the top plate.
As a preferred technical scheme of the present application, the second connecting member includes a second connecting plate, a second sliding chute, a sliding block, a protruding block, and a second telescopic rod; the second spout has all been seted up to both sides around the second connecting plate, and the inside slidable mounting of second spout has the slider, and the side of slider links to each other with first connecting plate through first spout, the surface is all fixed to be provided with the lug around the second connecting plate right-hand member, and the fixed second telescopic link that is provided with in left side of lug.
As a preferable technical scheme of the application, the second connecting plate and the first connecting plate are perpendicular to each other, and the second connecting plate and the first connecting plate form a sliding structure through a sliding block.
As the preferred technical scheme of this application, the slider passes through to constitute sliding structure between second spout and the second connecting plate, and the second connecting plate passes through second telescopic link and slider and wall body laminating.
As a preferred technical solution of the present application, the third connecting member includes a third connecting plate, a third telescopic rod, a lap plate, a lap rod, and a through hole; third connecting plate fixed mounting is on the right side of second connecting plate bottom, the fixed third telescopic link that is provided with of downside of first connecting plate, the front end fixedly connected with overlap joint board of third telescopic link, both sides are fixed around the overlap joint board and are provided with the overlap joint pole, the opening has been seted up to the inside of third connecting plate.
As the preferable technical scheme of this application, the side of first fly leaf and second fly leaf all is fixed and is provided with the gag lever post, and the gag lever post runs through in the inside of third connecting plate.
As the preferable technical scheme of this application, first fly leaf and second fly leaf all constitute sliding construction through between gag lever post and the third connecting plate.
As the preferable technical scheme of the application, the supporting component comprises a first rack, a movable groove, a second rack, a movable block and a gear; the first rack and the second rack are slidably mounted in the first movable plate, a movable groove used for the movement of the lap joint rod is formed in the surface of the first rack, a gear is rotatably mounted in the first movable plate, and movable blocks are fixedly arranged on the side faces of the first rack and the second rack.
As the preferred technical scheme of this application, first rack and second rack all constitute extending structure through between gear and the first fly leaf, the length of activity groove is greater than the length of overlap joint pole.
Compared with the prior art, the invention has the beneficial effects that:
in the scheme of the application:
1. the device has the advantages that the function of fixing the whole device and the wall body of the river channel revetment is realized through the three connecting pieces, so that the device can be used in cooperation with river channel construction, and the problem that a steel structure lifting machine in the prior art is not suitable for the river channel revetment when in use is solved;
2. by the three telescopic rods, the river channel protection slope is suitable for wall bodies with different thicknesses, the defect that the river channel protection slope with different thicknesses cannot be used in the process of machining a steel structure in the prior art is overcome, and the three telescopic rods have the advantages of wider application range and higher practicability;
3. through the arranged sliding blocks and the sliding grooves, the effect that the three connecting plates can be tightly attached to a wall body in the moving process is achieved, the overall occupied space of the device can be reduced as much as possible, and the defect that the lifting device in the prior art occupies a large space when in use is overcome;
4. through the supporting component who sets up, realized carrying out the function that promotes to unidimensional steel construction, can perhaps shorten the third telescopic link through the extension for the rack of different positions outwards stretches out, thereby realizes the bearing function to the steel construction, has solved among the prior art can not carry out the defect that promotes to unidimensional steel construction.
Drawings
Fig. 1 is a schematic overall structure diagram of the steel structure processing hoist provided by the present application;
fig. 2 is a schematic view of a connection structure of a second connection plate and a sliding block of the steel structure processing hoist provided by the application;
fig. 3 is a schematic view of a connection structure of a second connecting member and a wall body of the steel structure processing hoist provided by the present application;
fig. 4 is a schematic view of a connection structure of a third telescopic rod and a lap plate of the steel structure processing elevator provided by the present application;
fig. 5 is a schematic view of a connection structure of a first movable plate and a support assembly of the steel structure processing hoist provided by the present application.
The following are marked in the figure:
1. a first connecting member; 101. a first connecting plate; 102. a first chute; 103. a top plate; 104. a first telescopic rod; 2. a second connecting member; 201. a second connecting plate; 202. a second chute; 203. a slider; 204. a bump; 205. a second telescopic rod; 3. a third connecting member; 301. a third connecting plate; 302. a third telescopic rod; 303. a lap plate; 304. a lap joint rod; 305. a port; 4. a first movable plate; 5. a second movable plate; 6. a support assembly; 601. a first rack; 602. a movable groove; 603. a second rack; 604. a movable block; 605. a gear; 7. a limiting rod; 8. a communicating groove; 9. a wall body; 10. and (5) steel frame.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments.
Thus, the following detailed description of the embodiments of the invention is not intended to limit the scope of the invention as claimed, but is merely representative of some embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments of the present invention and the features and technical solutions thereof may be combined with each other without conflict.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "upper", "lower", and the like refer to orientations or positional relationships based on those shown in the drawings, or orientations or positional relationships that are conventionally arranged when the products of the present invention are used, or orientations or positional relationships that are conventionally understood by those skilled in the art, and such terms are used for convenience of description and simplification of the description, and do not refer to or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
As shown in fig. 1, 2, 3 and 4, the present embodiment provides a steel structure processing elevator, which includes a first connecting member 1, a wall 9 and a steel frame 10, wherein a second connecting member 2 is movably installed inside the upper half portion of the first connecting member 1, a third connecting member 3 is fixedly installed at the bottom of the first connecting member 1, three connecting members on the device can be tightly attached to the wall 9, so that the device can reduce the occupied space as much as possible, a first movable plate 4 is slidably installed inside the front side of the third connecting member 3, the front and rear positions of the support are adjusted by the movable plates on the device, a second movable plate 5 is slidably installed inside the rear side of the third connecting member 3, supporting members 6 are installed inside the first movable plate 4 and the second movable plate 5, communicating grooves 8 are formed on the surfaces of the first movable plate 4 and the second movable plate 5, the first connecting member 1, the second connecting member 2 and the third connecting member 3 are integrally installed on the side of the wall 9, the front end of the third connecting piece 3 is provided with a steel frame 10, and the left and right positions of the supporting component 6 are adjusted through the communicating groove 8 in the device.
As shown in fig. 1, 2 and 3, as a preferred embodiment, in addition to the above-mentioned manner, further, the first connecting member 1 includes a first connecting plate 101, a first sliding chute 102, a top plate 103 and a first telescopic rod 104; the middle of the first connecting plate 101 is in an open shape, a first sliding groove 102 is formed in the first connecting plate 101, a top plate 103 is fixedly arranged at the top of the first connecting plate 101, a first telescopic rod 104 is fixedly arranged at the rear side of the top plate 103, and the whole device is supported through the first telescopic rod 104 on the device, so that the steel frame 10 is lifted.
As shown in fig. 1, 2 and 3, as a preferred embodiment, on the basis of the above manner, further, the second connecting member 2 includes a second connecting plate 201, a second sliding groove 202, a sliding block 203, a projection 204 and a second telescopic rod 205; second spout 202 has all been seted up to both sides around the second connecting plate 201, the inside slidable mounting of second spout 202 has slider 203, slider 203 through installing makes the whole back-and-forth movement that can of second connecting plate 201, the practicality of device has been promoted, the side of slider 203 links to each other with first connecting plate 101 through first spout 102, the fixed lug 204 that is provided with in surface around the second connecting plate 201 right-hand member all, the fixed second telescopic link 205 that is provided with in left side of lug 204, utilize second telescopic link 205 to make the device can adapt to the wall body 9 of different thickness and fix.
As shown in fig. 1 and 2, in addition to the above-described embodiment, in a preferred embodiment, the second connecting plate 201 and the first connecting plate 101 are perpendicular to each other, the second connecting plate 201 and the first connecting plate 101 form a sliding structure via the slider 203, and the first connecting plate 101 can be adjusted not only in the vertical position but also in the left-right position by the sliding structure of the apparatus.
As shown in fig. 1, 2 and 3, in addition to the above-mentioned embodiments, in a preferred embodiment, a sliding structure is further formed between the second sliding groove 202 and the second connecting plate 201 by the sliding block 203, the second connecting plate 201 is attached to the wall 9 by the second expansion link 205 and the sliding block 203, and the second connecting plate 201 is pushed by the second expansion link 205 on the device, so that the second connecting plate 201 and the wall 9 are pressed.
As shown in fig. 1, 4 and 5, as a preferred embodiment, in addition to the above-mentioned manner, the third connecting member 3 further includes a third connecting plate 301, a third telescopic rod 302, a bridging plate 303, a bridging rod 304 and a through opening 305; third connecting plate 301 fixed mounting is on the right side of second connecting plate 201 bottom, the fixed third telescopic link 302 that is provided with of downside of first connecting plate 101, the front end fixedly connected with lapping plate 303 of third telescopic link 302, third telescopic link 302 is adjusted the position of lapping plate 303 on the device, both sides are fixed around lapping plate 303 are provided with lapping rod 304, through-hole 305 has been seted up to the inside of third connecting plate 301, make the fly leaf on the device can the back-and-forth movement through-hole 305.
As shown in fig. 1, 3, 4 and 5, in addition to the above-mentioned embodiment, in a preferred embodiment, a limiting rod 7 is fixedly disposed on a side surface of each of the first flap 4 and the second flap 5, the limiting rod 7 penetrates through the third connecting plate 301, and the initial position of the flap is adjusted by pushing the limiting rod 7.
As shown in fig. 1, 3, 4 and 5, in addition to the above-mentioned mode, as a preferred embodiment, further, the first flap 4 and the second flap 5 form a sliding structure through the limiting rod 7 and the third connecting plate 301, and the sliding structure on the device enables the device to perform supporting work on different positions of the steel structure.
As shown in fig. 1, 2, 4 and 5, as a preferred embodiment, on the basis of the above manner, further, the support assembly 6 includes a first rack 601, a movable groove 602, a second rack 603, a movable block 604 and a gear 605; first rack 601 and second rack 603 all slidable mounting are in the inside of first fly leaf 4, and the movable groove 602 that is used for overlap joint pole 304 to remove is seted up on the surface of first rack 601, and the removal can drive the rack and remove about overlap joint pole 304, and the rack is used for supporting the steel construction, and the gear 605 is installed in the internal rotation of first fly leaf 4, and the side of first rack 601 and second rack 603 all is fixed and is provided with movable block 604, makes the rack remove about can the level through movable block 604.
As shown in fig. 1, 3, 4 and 5, in addition to the above-mentioned embodiments, in a preferred embodiment, the first rack 601 and the second rack 603 both form a telescopic structure through the gear 605 and the first movable plate 4, and the length of the movable slot 602 is greater than that of the lap bar 304, so that the device does not have an adverse effect on the lap bar 304 while adjusting the front and rear positions of the racks.
Specifically, this steel construction processing lifting machine is when using: firstly, as shown in fig. 1, 2 and 3, the height and the left-right position of the second connecting piece 2 are adjusted, the first connecting piece 1 is put on the top of the wall 9, then the first telescopic rod 104 is lifted, the first connecting plate 101 and the first connecting plate 101 are jacked up by the first telescopic rod 104, so that the lower surface of the third connecting piece 3 is flush with the upper platform of the wall 9, at this time, the bump 204 and the second connecting plate 201 can be pushed by the second telescopic rod 205, so that the bent part at the tail end of the second connecting plate 201 and the first connecting plate 101 clamp the top of the wall 9, and the fixing work of the whole device is completed;
as shown in fig. 1, 2, 3, 4, and 5, the steel frame 10 is supported, the initial positions of the first movable plate 4 and the second movable plate 5 inside the through opening 305 are adjusted by pushing the limiting rod 7, in the adjusting process, the lapping rod 304 slides inside the movable groove 602, and after the adjustment is completed, the third telescopic rod 302 is extended or shortened, so that the first rack 601 and the second rack 603 inside the movable plates can be extended or shortened under the action of the gear 605, and the device can support the steel frame 10 through the extended first rack 601 or the second rack 603.
The above embodiments are only used for illustrating the invention and not for limiting the technical solutions described in the invention, and although the present invention has been described in detail in the present specification with reference to the above embodiments, the present invention is not limited to the above embodiments, and therefore, any modification or equivalent replacement of the present invention is made; all such modifications and variations are intended to be included herein within the scope of this disclosure and the appended claims.

Claims (10)

1. The steel structure processing elevator comprises a first connecting piece (1), a wall body (9) and a steel frame (10), the novel wall body connecting structure is characterized in that a second connecting piece (2) is movably mounted inside the upper half portion of the first connecting piece (1), a third connecting piece (3) is fixedly arranged at the bottom of the first connecting piece (1), a first movable plate (4) is slidably mounted inside the front side of the third connecting piece (3), a second movable plate (5) is slidably mounted inside the rear side of the third connecting piece (3), supporting components (6) are mounted inside the first movable plate (4) and the second movable plate (5), communicating grooves (8) are formed in the surfaces of the first movable plate (4) and the second movable plate (5), the first connecting piece (1), the second connecting piece (2) and the third connecting piece (3) are integrally mounted on the side face of a wall body (9), and a steel frame (10) is arranged at the front end of the third connecting piece (3).
2. The steel structure processing hoist as claimed in claim 1, characterized in that the first connecting member (1) comprises a first connecting plate (101), a first chute (102), a top plate (103) and a first telescopic rod (104); the middle of the first connecting plate (101) is open, a first sliding groove (102) is formed in the first connecting plate (101), a top plate (103) is fixedly arranged at the top of the first connecting plate (101), and a first telescopic rod (104) is fixedly arranged on the rear side of the top plate (103).
3. The steel structure machining hoist as claimed in claim 2, characterized in that the second connecting member (2) comprises a second connecting plate (201), a second runner (202), a slider (203), a lug (204) and a second telescopic rod (205); second spout (202) have all been seted up to both sides around second connecting plate (201), and the inside slidable mounting of second spout (202) has slider (203), and the side of slider (203) links to each other with first connecting plate (101) through first spout (102), the fixed lug (204) that is provided with in front and back surface of second connecting plate (201) right-hand member, the fixed second telescopic link (205) that is provided with in left side of lug (204).
4. The steel structure processing hoister according to claim 3, characterized in that the second connecting plate (201) and the first connecting plate (101) are perpendicular to each other, and the second connecting plate (201) and the first connecting plate (101) form a sliding structure through the sliding blocks (203).
5. The steel structure processing hoister according to claim 4, characterized in that the sliding block (203) forms a sliding structure with the second connecting plate (201) through the second sliding chute (202), and the second connecting plate (201) is attached to the wall (9) through the second telescopic rod (205) and the sliding block (203).
6. The steel structure processing hoist as claimed in claim 3, characterized in that the third connecting member (3) comprises a third connecting plate (301), a third telescopic bar (302), a lapping plate (303), a lapping bar (304) and through openings (305); third connecting plate (301) fixed mounting is on the right side of second connecting plate (201) bottom, the fixed third telescopic link (302) that is provided with of downside of first connecting plate (101), the front end fixedly connected with lapping plate (303) of third telescopic link (302), both sides are fixed around lapping plate (303) are provided with lap joint pole (304), opening (305) have been seted up to the inside of third connecting plate (301).
7. The steel structure machining hoist as claimed in claim 1, characterized in that a limiting rod (7) is fixedly arranged on each of the side surfaces of the first movable plate (4) and the second movable plate (5), and the limiting rod (7) penetrates through the inside of the third connecting plate (301).
8. The steel structure processing elevator as claimed in claim 7, characterized in that the first movable plate (4) and the second movable plate (5) form a sliding structure with the third connecting plate (301) through a limiting rod (7).
9. The steel structure machining hoist according to claim 6, characterized in that the support assembly (6) comprises a first rack (601), a movable groove (602), a second rack (603), a movable block (604) and a gear (605); the first rack (601) and the second rack (603) are both slidably mounted inside the first movable plate (4), a movable groove (602) used for the lap joint rod (304) to move is formed in the surface of the first rack (601), a gear (605) is rotatably mounted inside the first movable plate (4), and movable blocks (604) are fixedly arranged on the side surfaces of the first rack (601) and the second rack (603).
10. The steel structure processing elevator as claimed in claim 9, characterized in that the first rack (601) and the second rack (603) both form a telescopic structure through the gear (605) and the first movable plate (4), and the length of the movable groove (602) is greater than the length of the overlap rod (304).
CN202111371067.2A 2021-11-18 2021-11-18 Steel structure processing lifting machine Active CN113955667B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111371067.2A CN113955667B (en) 2021-11-18 2021-11-18 Steel structure processing lifting machine

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Application Number Priority Date Filing Date Title
CN202111371067.2A CN113955667B (en) 2021-11-18 2021-11-18 Steel structure processing lifting machine

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CN113955667A true CN113955667A (en) 2022-01-21
CN113955667B CN113955667B (en) 2023-03-24

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0771018A (en) * 1993-09-01 1995-03-14 Yoshikawa Kaiji Kogyo Kk Working method of disposable form of concrete lining on revetment wall
KR20040061162A (en) * 2002-12-30 2004-07-07 재 술 나 Merhod for protecting and reinforcing slopes
US20070017746A1 (en) * 2005-07-25 2007-01-25 Joerg Robbin Surface treatment installation having a lifting station
CN108793009A (en) * 2018-06-28 2018-11-13 合肥米弘智能科技有限公司 A kind of steel construction is lifted equipment and the construction method of the steel construction automatically
CN210528364U (en) * 2019-09-18 2020-05-15 杭州龙梁钢结构有限公司 Construction platform special for steel structure
CN212866405U (en) * 2020-05-23 2021-04-02 杭州市建筑设计研究院有限公司 External thermal insulation wall
CN213595790U (en) * 2020-10-12 2021-07-02 南京长达管塔钢结构有限责任公司 Lifting equipment for steel structure

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0771018A (en) * 1993-09-01 1995-03-14 Yoshikawa Kaiji Kogyo Kk Working method of disposable form of concrete lining on revetment wall
KR20040061162A (en) * 2002-12-30 2004-07-07 재 술 나 Merhod for protecting and reinforcing slopes
US20070017746A1 (en) * 2005-07-25 2007-01-25 Joerg Robbin Surface treatment installation having a lifting station
CN108793009A (en) * 2018-06-28 2018-11-13 合肥米弘智能科技有限公司 A kind of steel construction is lifted equipment and the construction method of the steel construction automatically
CN210528364U (en) * 2019-09-18 2020-05-15 杭州龙梁钢结构有限公司 Construction platform special for steel structure
CN212866405U (en) * 2020-05-23 2021-04-02 杭州市建筑设计研究院有限公司 External thermal insulation wall
CN213595790U (en) * 2020-10-12 2021-07-02 南京长达管塔钢结构有限责任公司 Lifting equipment for steel structure

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