CN111081174A - Steel structure billboard and construction method - Google Patents
Steel structure billboard and construction method Download PDFInfo
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- CN111081174A CN111081174A CN202010139764.4A CN202010139764A CN111081174A CN 111081174 A CN111081174 A CN 111081174A CN 202010139764 A CN202010139764 A CN 202010139764A CN 111081174 A CN111081174 A CN 111081174A
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- column
- base
- reinforcing
- embedded part
- connecting seat
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F15/00—Boards, hoardings, pillars, or like structures for notices, placards, posters, or the like
- G09F15/0006—Boards, hoardings, pillars, or like structures for notices, placards, posters, or the like planar structures comprising one or more panels
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F15/00—Boards, hoardings, pillars, or like structures for notices, placards, posters, or the like
- G09F15/0068—Modular articulated structures, e.g. stands, and articulation means therefor
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Architecture (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Signs Or Road Markings (AREA)
Abstract
The invention relates to a steel structure billboard, which comprises a billboard, rear reinforcing columns and a bottom base, wherein the back surface of the billboard is provided with a plurality of rear reinforcing columns, the bottoms of the rear reinforcing columns are fixed on the bottom base, the rear reinforcing columns are parallel to each other and are arranged in a straight line at equal intervals, and the bottom base is pre-buried in a concrete layer. The invention also provides a construction method of the steel structure billboard. The invention has the following beneficial effects: according to the steel structure billboard and the construction method, the first concrete casting and the second concrete casting which are assembled and then cast and cast twice are adopted, so that the stability of the billboard is improved, the steel structure billboard is suitable for occasions where large-scale hoisting equipment and large-scale machinery cannot enter a field, the billboard, the rear reinforcing column and the bottom base can be transported to the field, the field construction is realized, and the applicability is strong. The invention has the advantages of simple structure, novel design, convenient installation, firmness and durability.
Description
Technical Field
The invention relates to a steel structure billboard and a construction method, and belongs to the technical field of billboard structures.
Background
In the modern society, the advertising industry is developed vigorously, large and small advertising boards are visible everywhere, and in recent years, large advertising display boards on expressways in various places are very intuitive to show brand connotation and are widely accepted by people.
The assembled billboard is characterized in that each part of the billboard structure is manufactured in advance, and then the assembled billboard is simply assembled at a putting position, so that the complexity and inflexibility of the original pouring billboard are eliminated. However, many conventional built-up billboards have a problem that both convenience in use and stability are not compatible.
Disclosure of Invention
According to the defects in the prior art, the technical problems to be solved by the invention are as follows: in order to solve one of the above problems, a steel structure billboard and a construction method thereof are provided.
The invention relates to a steel structure billboard, which is characterized in that: the advertising board comprises an advertising board, rear reinforcing columns and a bottom base, wherein the back face of the advertising board is provided with a plurality of rear reinforcing columns, the bottoms of the rear reinforcing columns are fixed on the bottom base, the rear reinforcing columns are parallel to each other and are arranged in a straight line at equal intervals, and the bottom base is embedded in a concrete layer.
Preferably, the number of the bottom bases is equal to that of the rear reinforcing columns, and a bottom base is correspondingly mounted at the bottom of each rear reinforcing column.
Preferably, the bottom base comprises a connecting column, a reinforcing column connecting seat, an embedded part connecting seat, a lower fixing pull plate, a tensioning bolt and a bottom embedded part, the connecting column is vertically arranged, the reinforcing column connecting seat horizontally arranged is welded to the top of the connecting column, the embedded part connecting seat wraps the bottom of the connecting column, the bottom embedded part extending downwards is arranged on each of two sides of the embedded part connecting seat, the lower fixing pull plate is arranged below the connecting column and is a disc, the upper surface of the lower fixing pull plate abuts against the lower end face of the embedded part connecting seat, the connecting column and the lower fixing pull plate are concentrically arranged, a connecting screw hole is formed in the center position of the lower end face of the connecting column, and the tensioning bolt penetrates through the lower fixing pull plate and is in threaded connection with the connecting screw hole in the connecting.
Preferably, the connecting column is a hollow cylindrical head with two open ends, a reinforcing column connecting seat is welded at one end of the hollow cylindrical head, the reinforcing column connecting seat is a rectangular steel plate, a reinforcing column connecting positioning column is welded on the upper end face of the reinforcing column connecting seat, the reinforcing column connecting positioning column and the connecting column are concentrically arranged, reinforcing column connecting screw holes are respectively formed in four corners of the reinforcing column connecting seat, an upper pulling plate is welded in the inner portion of the other end of the connecting column, and a connecting screw hole is formed in the center of the upper pulling plate.
Preferably, the outer wall of the upper portion of the connecting column is concentrically provided with an upper positioning ring, the lower surface of the upper positioning ring abuts against the upper surface of the embedded part connecting seat, the embedded part connecting seat further comprises reinforcing rib plates uniformly distributed on the outer wall of the connecting column, and the connecting column, the reinforcing column connecting seat and the upper positioning ring are all in welded connection with the reinforcing rib plates.
Preferably, the built-in fitting connecting seat includes base one and base two that each other lock together, base one links together through connecting bolt detachable with base two, base one and base two symmetry set up, and the structure is the same, and the position that base one and base two correspond the spliced pole is seted up respectively and is put preceding, back breach, and when base one and base two were closed, preceding, the back breach makes up the through-hole that supplies the spliced pole to pass, base one includes axle bush, even axle bush fishplate bar and axle bush fixed plate, and the axle bush cover is established outside the spliced pole, even axle bush fishplate bar level sets up, and the both ends of even axle bush fishplate bar are fixed respectively on the side of axle bush and axle bush fixed plate, and the welding has the bottom built-in fitting on the another side of axle.
Preferably, the bottom built-in fitting is provided with the multiunit, including the horizontal segment of welding on the built-in fitting connecting seat, the other end of horizontal segment is provided with vertical insertion section, and the bottom detachable of vertical insertion section is connected with type of falling T landing leg.
Preferably, the billboard comprises a billboard frame and a billboard main body, the billboard main body is embedded into the billboard frame, the rear reinforcing column is fixedly connected with the billboard frame, the rear reinforcing column is a hollow main body, the bottom of the rear reinforcing column is inserted into the reinforcing column connecting positioning column, the bottom of the rear reinforcing column is provided with a flange used for being connected with the reinforcing column connecting seat, and the rear reinforcing column is fixed on the reinforcing column connecting seat through a bolt and a reinforcing column connecting screw hole.
The invention also provides a construction method of the steel structure billboard, which comprises the following construction steps of:
prefabricating a connecting column, a reinforcing column connecting seat, a first base, a second base, a lower fixing pull plate, a tensioning bolt and a bottom layer embedded part in a factory;
welding an upper positioning ring and a reinforcing rib plate on a connecting column in a factory, welding a reinforcing column connecting and positioning column on the upper surface of a reinforcing column connecting seat, welding an upper pulling plate at the bottom end of the connecting column, and welding a bottom layer embedded part on a first base and a second base;
step three, arranging a reinforcing column connecting screw hole on the reinforcing column connecting seat, and arranging a connecting screw hole on the upper pulling plate;
fourthly, transporting the processed parts to a construction site;
connecting the first base and the second base together through connecting bolts according to the design to form an embedded part connecting seat, inserting a connecting column into the embedded part connecting seat, and fixing the connecting column through a lower fixing pull plate, a tensioning bolt and a connecting screw hole;
and step six, pre-burying the bottom of the bottom embedded part through a first concrete casting body, and pre-burying an embedded part connecting seat through a second concrete casting body after connecting the positioning column, the reinforcing column connecting screw hole and the connecting bolt with the rear reinforcing column through the reinforcing column.
Preferably, the connecting bolt and the tension bolt in the fifth step are pressure-bearing high-strength bolts.
Compared with the prior art, the invention has the following beneficial effects: according to the steel structure billboard and the construction method, the first concrete casting and the second concrete casting which are assembled and then cast and cast twice are adopted, so that the stability of the billboard is improved, the steel structure billboard is suitable for occasions where large-scale hoisting equipment and large-scale machinery cannot enter a field, the billboard, the rear reinforcing column and the bottom base can be transported to the field, the field construction is realized, and the applicability is strong. The invention has the advantages of simple structure, novel design, convenient installation, firmness and durability.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of a bottom base;
FIG. 3 is a schematic view of the construction of the bottom base;
FIG. 4 is a bottom view of the bottom base;
FIG. 5 is a top view of the reinforcing post attachment base;
FIG. 6 is a side view of the first base.
In the figure: 1. the novel concrete-filled bearing comprises an advertising board 2, a rear reinforcing column 3, a bottom base 3.1, a connecting column 3.2, a reinforcing column connecting seat 3.3, an embedded part connecting seat 3.4, a lower fixing pull plate 3.5, a tensioning bolt 3.6, a bottom embedded part 3.7, a connecting screw hole 3.8, a reinforcing column connecting positioning column 3.9, a reinforcing column connecting screw hole 3.10, an upper pull plate 4, an upper positioning ring 5, a reinforcing rib plate 6, a connecting bolt 7, a bearing bush 8, a connecting shaft bearing plate 9, a bearing bush fixing plate 10, a first concrete pouring body 11 and a second concrete pouring body.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
the present invention is further illustrated by the following specific examples, which are not intended to limit the scope of the invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Examples
As shown in fig. 1 to 6, the steel-structured advertising board comprises an advertising board 1, rear reinforcing columns 2 and a bottom base 3, wherein the rear reinforcing columns 2 are installed on the back surface of the advertising board 1, the bottoms of the rear reinforcing columns 2 are fixed on the bottom base 3, the rear reinforcing columns 2 are parallel to each other and are arranged in a straight line at equal intervals, and the bottom base 3 is embedded in a concrete layer.
In this embodiment, the number of the bottom bases 3 is equal to that of the rear reinforcing columns 2, and the bottom of each rear reinforcing column 2 is correspondingly provided with a bottom base 3; the bottom base 3 comprises a connecting column 3.1, a reinforcing column connecting seat 3.2, an embedded part connecting seat 3.3, a lower fixing pull plate 3.4, a tensioning bolt 3.5 and a bottom layer embedded part 3.6, wherein the connecting column 3.1 is vertically arranged, the reinforcing column connecting seat 3.2 horizontally arranged is welded at the top of the connecting column 3.1, the embedded part connecting seat 3.3 is wrapped at the bottom of the connecting column 3.1, the bottom layer embedded part 3.6 extending downwards is arranged on each of two sides of the embedded part connecting seat 3.3, the lower fixing pull plate 3.4 is arranged below the connecting column 3.1, the lower fixing pull plate 3.4 is a circular disc, the upper surface of the lower fixing pull plate 3.4 abuts against the lower end surface of the embedded part connecting seat 3.3, the connecting column 3.1 and the lower fixing pull plate 3.4 are concentrically arranged, a connecting screw hole 3.7 is formed in the center position of the lower end surface of the connecting column 3.1, and the tensioning bolt 3.5 penetrates through the lower fixing pull plate 3.4 to be in threaded connection with the; the connecting column 3.1 is a hollow cylindrical head with openings at two ends, a reinforcing column connecting seat 3.2 is welded at one end, the reinforcing column connecting seat 3.2 is a rectangular steel plate, a reinforcing column connecting positioning column 3.8 is welded on the upper end face of the reinforcing column connecting seat 3.2, the reinforcing column connecting positioning column 3.8 and the connecting column 3.1 are concentrically arranged, reinforcing column connecting screw holes 3.9 are respectively formed in four corners of the reinforcing column connecting seat 3.2, an upper pulling plate 3.10 is welded in the other end of the connecting column 3.1, and a connecting screw hole 3.7 is formed in the center of the upper pulling plate 3.10; the outer wall of the upper part of the connecting column 3.1 is concentrically provided with an upper positioning ring 4, the lower surface of the upper positioning ring 4 is abutted against the upper surface of the embedded part connecting seat 3.3, the embedded part connecting seat further comprises reinforcing rib plates 5 uniformly distributed on the outer wall of the connecting column 3.1, and the connecting column 3.1, the reinforcing column connecting seat 3.2 and the upper positioning ring 4 are all welded and connected with the reinforcing rib plates 5; the embedded part connecting seat 3.3 comprises a first base and a second base which are mutually buckled, the first base and the second base are detachably connected together through a connecting bolt 6, the first base and the second base are symmetrically arranged and have the same structure, front notches and rear notches are respectively arranged at the positions, corresponding to the connecting columns 3.1, of the first base and the second base, when the first base and the second base are closed, the front notches and the rear notches are combined into through holes for the connecting columns 3.1 to pass through, the first base comprises a bearing bush 7, a connecting shaft bearing plate 8 and a bearing bush fixing plate 9, the bearing bush 7 is sleeved outside the connecting columns 3.1, the connecting shaft bearing plate 8 is horizontally arranged, two ends of the connecting shaft bearing plate 8 are respectively fixed on the side surfaces of the bearing bush 7 and the bearing bush fixing plate 9, and a bottom embedded part 3.6 is welded on the other; the bottom layer embedded parts 3.6 are provided with a plurality of groups, each group comprises a horizontal section welded on the embedded part connecting seat 3.3, the other end of each horizontal section is provided with a vertical inserting section, and the bottom of each vertical inserting section is detachably connected with an inverted T-shaped supporting leg; the advertising board 1 comprises an advertising board frame and an advertising board main body, the advertising board main body is embedded into the advertising board frame, the rear reinforcing column 2 is fixedly connected with the advertising board frame, the rear reinforcing column 2 is a hollow main body, the bottom of the rear reinforcing column 2 is inserted into the reinforcing column connecting positioning column 3.8, a flange used for being connected with the reinforcing column connecting seat 3.2 is arranged at the bottom of the rear reinforcing column 2, and the rear reinforcing column 2 is fixed on the reinforcing column connecting seat 3.2 through a bolt and a reinforcing column connecting screw hole 3.9.
The invention also provides a construction method of the steel structure billboard, and the construction steps of the bottom base 3 are as follows:
prefabricating a connecting column 3.1, a reinforcing column connecting seat 3.2, a first base, a second base, a lower fixing pull plate 3.4, a tension bolt 3.5 and a bottom layer embedded part 3.6 in a factory;
welding an upper positioning ring 4 and a reinforcing rib plate 5 on a connecting column 3.1 in a factory, welding a reinforcing column connecting and positioning column 3.8 on the upper surface of a reinforcing column connecting seat 3.2, welding an upper pulling plate 3.10 at the bottom end of the connecting column 3.1, and welding a bottom layer embedded part 3.6 on a first base and a second base;
step three, arranging a reinforcing column connecting screw hole 3.9 on a reinforcing column connecting seat 3.2, and arranging a connecting screw hole 3.7 on an upper pulling plate 3.10;
fourthly, transporting the processed parts to a construction site;
connecting the first base and the second base together through a connecting bolt 6 according to design to form an embedded part connecting seat 3.3, inserting a connecting column 3.1 into the embedded part connecting seat 3.3, and fixing the connecting column 3.1 through a lower fixing pull plate 3.4, a tensioning bolt 3.5 and a connecting screw hole 3.7;
step six, the bottom of a bottom embedded part 3.6 is embedded through a first concrete casting body 10, and after a reinforcing column connecting positioning column 3.8, a reinforcing column connecting screw hole 3.9 and a connecting bolt are connected with a rear reinforcing column 2, an embedded part connecting seat 3.3 is embedded through a second concrete casting body 11; and the connecting bolt 6 and the tension bolt 3.5 in the fifth step are pressure-bearing high-strength bolts.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The utility model provides a steel construction bill-board which characterized in that: the novel advertising board comprises an advertising board (1), rear reinforcing columns (2) and a bottom base (3), wherein the back face of the advertising board (1) is provided with a plurality of rear reinforcing columns (2), the bottoms of the rear reinforcing columns (2) are fixed on the bottom base (3), the rear reinforcing columns (2) are parallel to each other and are arranged in a straight line at equal intervals, and the bottom base (3) is embedded in a concrete layer.
2. The steel structure signboard of claim 1, wherein: the number of the bottom bases (3) is equal to that of the rear reinforcing columns (2), and the bottom of each rear reinforcing column (2) is correspondingly provided with one bottom base (3).
3. The steel structure signboard of claim 2, wherein: the bottom base (3) comprises a connecting column (3.1), a reinforcing column connecting seat (3.2), an embedded part connecting seat (3.3), a lower fixing pull plate (3.4), a tensioning bolt (3.5) and a bottom embedded part (3.6), the connecting column (3.1) is vertically arranged, the reinforcing column connecting seat (3.2) which is horizontally arranged is welded at the top of the connecting column (3.1), the embedded part connecting seat (3.3) is wrapped at the bottom of the connecting column (3.1), the bottom embedded part (3.6) which extends downwards is arranged on both sides of the embedded part connecting seat (3.3), the lower fixing pull plate (3.4) is arranged below the connecting column (3.1), the lower fixing pull plate (3.4) is a circular disc, the upper surface of the lower fixing pull plate (3.4) is abutted against the lower end surface of the embedded part connecting seat (3.3), the connecting column (3.1) and the lower fixing pull plate (3.4) are concentrically arranged, and the central position of the lower end surface of the connecting column (3.1) is provided with a connecting hole (7.7, the tensioning bolt (3.5) passes through the lower fixed pulling plate (3.4) and is in threaded connection with a connecting screw hole (3.7) on the connecting column (3.1).
4. The steel structure signboard of claim 3, wherein: the reinforced steel column connecting structure is characterized in that the connecting column (3.1) is a hollow cylindrical head with two open ends, a reinforcing column connecting seat (3.2) is welded at one end of the hollow cylindrical head, the reinforcing column connecting seat (3.2) is a rectangular steel plate, a reinforcing column connecting positioning column (3.8) is welded at the upper end face of the reinforcing column connecting seat (3.2), the reinforcing column connecting positioning column (3.8) and the connecting column (3.1) are concentrically arranged, reinforcing column connecting screw holes (3.9) are respectively formed in four corners of the reinforcing column connecting seat (3.2), an upper pulling plate (3.10) is welded inside the other end of the connecting column (3.1), and a connecting screw hole (3.7) is formed in the center position of the upper pulling plate.
5. The steel structure billboard of claim 4, wherein: the outer wall of the upper portion of the connecting column (3.1) is concentrically provided with an upper positioning ring (4), the lower surface of the upper positioning ring (4) abuts against the upper surface of the embedded part connecting seat (3.3), the embedded part connecting seat further comprises reinforcing rib plates (5) uniformly distributed on the outer wall of the connecting column (3.1), and the connecting column (3.1), the reinforcing column connecting seat (3.2) and the upper positioning ring (4) are all in welded connection with the reinforcing rib plates (5).
6. The steel structure signboard of claim 5, wherein: the embedded part connecting seat (3.3) comprises a first base and a second base which are mutually buckled together, the first base and the second base are detachably connected together through a connecting bolt (6), the first base and the second base are symmetrically arranged, the structure is the same, the positions of the first base and the two corresponding connecting columns (3.1) of the base are respectively provided with a front gap and a rear gap, when the first base and the second base are closed, the front gap and the rear gap are combined into a through hole for the connecting column (3.1) to pass through, the base I comprises a bearing bush (7), a connecting bush connecting plate (8) and a bearing bush fixing plate (9), the bearing bush (7) is sleeved outside a connecting column (3.1), the connecting bush connecting plate (8) is horizontally arranged, two ends of the connecting bush connecting plate (8) are fixed on the side faces of the bearing bush (7) and the bearing bush fixing plate (9) respectively, and a bottom embedded part (3.6) is welded on the other side face of the bearing bush fixing plate (9).
7. The steel structure billboard of claim 6, wherein: the bottom embedded part (3.6) is provided with a plurality of groups, including the horizontal segment of welding on the embedded part connecting seat (3.3), the other end of horizontal segment is provided with vertical insertion section, and the bottom detachable of vertical insertion section is connected with type of falling T landing leg.
8. The steel-structured signboard of claim 7, wherein: the advertising board (1) comprises an advertising board frame and an advertising board main body, the advertising board main body is embedded into the advertising board frame, the rear reinforcing column (2) is fixedly connected with the advertising board frame, the rear reinforcing column (2) is a hollow main body, the bottom of the rear reinforcing column (2) is inserted into the reinforcing column connecting positioning column (3.8), a flange used for being connected with the reinforcing column connecting seat (3.2) is arranged at the bottom of the rear reinforcing column (2), and the rear reinforcing column (2) is fixed on the reinforcing column connecting seat (3.2) through a bolt and a reinforcing column connecting screw hole (3.9).
9. A construction method of a steel structure billboard is characterized in that: the construction steps of the bottom base (3) are as follows:
prefabricating a connecting column (3.1), a reinforcing column connecting seat (3.2), a first base, a second base, a lower fixed pull plate (3.4), a tension bolt (3.5) and a bottom layer embedded part (3.6) in a factory;
welding an upper positioning ring (4) and a reinforcing rib plate (5) on a connecting column (3.1) in a factory, welding a reinforcing column connecting and positioning column (3.8) on the upper surface of a reinforcing column connecting seat (3.2), welding an upper pulling plate (3.10) at the bottom end of the connecting column (3.1), and welding a bottom layer embedded part (3.6) on a first base and a second base;
step three, arranging a reinforcing column connecting screw hole (3.9) on a reinforcing column connecting seat (3.2), and arranging a connecting screw hole (3.7) on an upper pulling plate (3.10);
fourthly, transporting the processed parts to a construction site;
connecting the first base and the second base together through connecting bolts (6) according to design to form an embedded part connecting seat (3.3), inserting the connecting column (3.1) into the embedded part connecting seat (3.3), and fixing the connecting column (3.1) through a lower fixing pull plate (3.4), a tensioning bolt (3.5) and a connecting screw hole (3.7);
and sixthly, pre-embedding the bottoms of the bottom-layer embedded parts (3.6) through a first concrete casting body (10), connecting the positioning columns (3.8) through the reinforcing columns, connecting the screw holes (3.9) through the reinforcing columns, and connecting the connecting bolts with the rear reinforcing columns (2), and pre-embedding the embedded part connecting seats (3.3) through a second concrete casting body (11).
10. The construction method of the steel structure signboard of claim 9, wherein: and the connecting bolt (6) and the tension bolt (3.5) in the fifth step are pressure-bearing high-strength bolts.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010139764.4A CN111081174B (en) | 2020-03-03 | 2020-03-03 | Steel structure billboard and construction method |
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|---|---|---|---|
| CN202010139764.4A CN111081174B (en) | 2020-03-03 | 2020-03-03 | Steel structure billboard and construction method |
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| CN111081174A true CN111081174A (en) | 2020-04-28 |
| CN111081174B CN111081174B (en) | 2021-09-24 |
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| CN111081174B (en) | 2021-09-24 |
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