CN114211212A - Manufacturing and construction method of large-section steel box girder - Google Patents
Manufacturing and construction method of large-section steel box girder Download PDFInfo
- Publication number
- CN114211212A CN114211212A CN202210062489.XA CN202210062489A CN114211212A CN 114211212 A CN114211212 A CN 114211212A CN 202210062489 A CN202210062489 A CN 202210062489A CN 114211212 A CN114211212 A CN 114211212A
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- box girder
- steel box
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- jack
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 98
- 239000010959 steel Substances 0.000 title claims abstract description 98
- 238000010276 construction Methods 0.000 title claims abstract description 42
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 21
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 5
- 238000003466 welding Methods 0.000 claims description 45
- 238000009434 installation Methods 0.000 claims description 5
- 238000011900 installation process Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
Abstract
The invention provides a method for manufacturing and constructing a large-section steel box girder. The bottom of the steel box girder is provided with a bottom plate unit element, the bottom plate unit element is provided with a reinforcing rib for reinforcement, the upper part of the bottom plate unit element is provided with a diaphragm plate unit element and a web plate unit element, the upper part of the steel box girder is provided with a panel unit element, the panel unit element is provided with a U-shaped rib for reinforcement, and the two sides of the steel box girder are provided with cantilever unit elements. The invention belongs to the field of civil engineering, and aims at a construction method for manufacturing a large-section steel box girder, so that the engineering cost is effectively reduced, the construction speed is accelerated, and better technical and economic benefits can be obtained when the method is applied to actual engineering.
Description
Technical Field
The invention relates to the field of civil engineering, in particular to a method for manufacturing and constructing a large-section steel box girder.
Background
The steel box girder is applied to the environments with complex geographic positions with unique advantages, bears the traffic of cities and brings convenience to the traveling of citizens to the maximum extent. Due to the functional diversity of the steel box girder, the manufacturing and mounting technology of the steel box girder is increasingly difficult.
The conventional large-section steel box girder manufacturing construction has the problems of difficult installation and positioning of a steel box girder structure, low construction efficiency, poor pre-camber control effect in large-section steel box girder manufacturing and the like.
Disclosure of Invention
The invention aims to provide a method for manufacturing and constructing a large-section steel box girder, which reduces the engineering cost, accelerates the construction speed and can obtain better technical and economic benefits when applied to actual engineering.
In order to solve the technical problem, the invention provides a method for manufacturing and constructing a large-section steel box girder, which comprises the following steps:
step one, lofting and blanking of unit pieces: carrying out single element lofting and blanking construction according to a design drawing, stacking the single elements by adopting a single element stacking rack after the single elements are machined, and arranging square wood on the single element stacking rack to stack the single elements in a layered manner;
step two, welding a base plate unit piece: welding construction of base plate unit elements is carried out, a shaped positioning fixture is adopted for positioning and fixing in the welding process of the base plate unit elements, the lower portion of the shaped positioning fixture is connected with a fixed code plate, the fixed code plate and the base plate unit elements are fixed, the fixed code plate is fixed with an upper cross beam through a bolt and a screw, the lower portion of the upper cross beam extrudes and positions the seam position of the base plate unit elements through a jack and a steel plate, and a steel gasket is arranged on the lower portion of the seam position of the base plate unit elements; the pre-camber is dynamically adjusted through a pre-camber adjusting bracket in the welding process of the bottom plate structure, a jack, a rubber pad and a steel plate are arranged at the upper part of a horizontal supporting beam on the pre-camber adjusting bracket to jack the steel box girder, and the pre-camber of the steel box girder is accurately controlled through dynamic monitoring of the stroke of the jack;
step three, welding construction of a diaphragm plate single element: welding the diaphragm plate unit elements, performing auxiliary positioning by adopting a unit plate positioning support, mounting the lower part of the unit plate positioning support on the bottom plate unit elements through a bottom cross beam, mounting a plurality of layers of jack fixing platforms in the middle of the unit plate positioning support, and positioning the mounting positions of the diaphragm plate unit elements by the front ends of the jack fixing platforms through jacks and steel plates;
step four, welding construction of the web single element: welding construction of web single elements is carried out, and a unit plate positioning support is adopted for positioning in the installation process;
step five, welding construction of panel unit parts: carrying out welding construction on the panel unit parts, and fixing by adopting a shaped positioning fixture in the welding process;
step six, integrally welding the steel box girder: and dynamically adjusting the pre-camber in the welding process of the steel box girder by adopting the pre-camber adjusting bracket.
The invention has the beneficial effects that:
(1) stacking the unit pieces by using a unit piece stacking frame to prevent the processed unit pieces from being extruded and deformed;
(2) the joint positions of the panel unit parts and the bottom plate unit parts are positioned and fixed by adopting a shaped positioning fixture in the welding process of the panel unit parts and the bottom plate unit parts, so that the manufacturing construction quality and the construction efficiency of the large-section steel box girder are improved;
(3) the pre-camber of the steel box girder is accurately controlled by dynamically adjusting the stroke of a jack on the pre-camber adjusting bracket, so that the manufacturing construction quality of the large-section steel box girder is improved;
(4) adopt the cell board locating support to carry out assistance-localization real-time in diaphragm unit spare and the web unit spare welding process, improve unit spare welding installation positioning accuracy.
Drawings
FIG. 1 is a structural view of a large-section steel box girder;
FIG. 2 is a block diagram of a unit stack;
FIG. 3 is a diagram of a stylized alignment fixture;
FIG. 4 is a structural view of a steel box girder and a pre-camber adjusting bracket;
FIG. 5 is a view of a pre-camber adjustment bracket;
FIG. 6 is a cross-sectional view of the pre-camber adjustment bracket;
FIG. 7 is a view showing a structure of a cell plate positioning bracket;
fig. 8 is a view showing the structure of mounting the unit board.
In the figure: 1, a steel box girder; 2, a bottom plate unit element; 3, a panel unit element; 4, a diaphragm unit element; 5, a U-shaped rib; 6, picking arm unit parts; 7, a web single element; 8, reinforcing ribs; 9, stacking the unit pieces; 10, vertical columns; 11, a unit element; 12, square wood; 13, supporting the platform; 14, a bottom cross beam; 15, forming a positioning clamp; 16, a face/base unit element; 17, fixing the code plate; 18, a steel liner; 19, welding; 20, a jack; 21, an upper cross beam; 22, steel plate; 23, bolts; 24, a screw; 25, pre-camber adjusting support; 26, a rubber pad; 27, horizontal support beams; 28, vertical legs; 29, diagonal bracing; 30, an inclined supporting leg; 31, a unit plate positioning bracket; 32, a diaphragm/web element; 33, fixing the platform by using a jack; and 34, steel inclined struts.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be constructed and operated in a particular orientation and thus are not to be considered limiting.
It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.
As shown in fig. 1-8, the invention provides a method for manufacturing and constructing a large-section steel box girder, which comprises the following steps:
step one, lofting and blanking of a unit piece 11: carrying out lofting and blanking construction on the unit pieces 11 according to a design drawing, stacking the unit pieces 11 by using a unit piece stacking frame 9 after the unit pieces 11 are machined, and arranging square timbers 12 on the unit piece stacking frame 9 to stack the unit pieces 11 in a layered manner so as to prevent extrusion deformation;
step two, welding the base plate unit piece 2: welding construction of a base plate single element 2 is carried out, a shaped positioning clamp 15 is adopted for positioning and fixing in the welding process of the base plate single element 2, a fixed code plate 17 is welded and connected to the lower portion of the shaped positioning clamp 15, the fixed code plate 17 is fixed with the base plate single element 2, the fixed code plate 17 is fixed with an upper cross beam 21 through a bolt 23 and a screw 24, the lower portion of the upper cross beam 21 extrudes and positions the joint position of the base plate single element 2 through a jack 20 and a steel plate 22, and a steel liner 18 is arranged on the lower portion of the joint position of the base plate single element 2 to facilitate welding of the joint structure; the pre-camber is dynamically adjusted through a pre-camber adjusting bracket 25 in the welding process of the bottom plate structure, a jack 20, a rubber pad 26 and a steel plate 22 are arranged at the upper part of a horizontal supporting beam 27 on the pre-camber adjusting bracket 25 to jack the steel box girder 1, and the pre-camber of the steel box girder 1 is accurately controlled through dynamic monitoring of the stroke of the jack 20;
step three, welding construction of a diaphragm plate single element 4: welding construction of the diaphragm plate single element 4 is carried out, auxiliary positioning is carried out by adopting the unit plate positioning support 31, the lower part of the unit plate positioning support 31 is installed on the bottom plate single element 2 through the bottom cross beam 14, a plurality of layers of jack fixing platforms 33 are installed in the middle of the unit plate positioning support 31, and auxiliary positioning is carried out on the installation position of the diaphragm plate single element 4 by the front ends of the jack fixing platforms 33 through the jacks 20 and the steel plates 22. (ii) a
Step four, welding construction of the web single element 7: welding construction of the web single element 7 is carried out, and auxiliary positioning is carried out by adopting a unit plate positioning bracket 31 in the installation process;
step five, welding construction of the panel unit piece 3: carrying out welding construction on the panel unit part 3, and adopting a shaped positioning clamp 15 to weld and fix in the welding process;
step six, integrally welding the steel box girder 1: and dynamically adjusting the pre-camber in the welding process of the steel box girder 1 by adopting a pre-camber adjusting bracket 25.
The invention also discloses a large-section steel box girder which comprises a steel box girder 1, a panel unit element 3, a bottom plate unit element 2, a diaphragm unit element 4, a web unit element 7, an arm picking unit element 6, a U-shaped rib 5 and a reinforcing rib 8. The bottom of steel box girder 1 sets up bottom plate unit spare 2, sets up stiffening rib 8 on the bottom plate unit spare 2 and strengthens, and bottom plate unit spare 2 upper portion sets up diaphragm unit spare 4 and web unit spare 7, and 1 upper portion of steel box girder sets up panel unit spare 3, sets up U-shaped rib 5 on the panel unit spare 3 and strengthens processing, and 1 both sides of steel box girder set up cantilever unit spare 6.
Specifically, the bottom plate unit piece 2 and the panel unit piece 3 are connected through the diaphragm plate unit piece 4 and the web plate unit piece 7, the reinforcing rib 8 is positioned at an included angle between the bottom plate unit piece 2 and the diaphragm plate unit piece 4 for stabilizing the bottom plate unit piece 2, and the U-shaped rib 5 is positioned at an included angle between the panel unit piece 3 and the diaphragm plate unit piece 4 for stabilizing the panel unit piece 3.
The unit piece 11 of the steel box girder 1 is stacked by adopting the unit piece stacking rack 9, the bottom beam 14 is arranged at the lower part of the unit piece stacking rack 9, the vertical upright column 10 is arranged at one side of the unit piece stacking rack 9, the multilayer supporting platform 13 is arranged at the upper part of the unit piece stacking rack 9, the square timber 12 is arranged on the supporting platform 13 for supporting, and the unit piece 11 is arranged on the square timber 12.
Specifically, the bottom cross beam 14 is perpendicular to the vertical column 10, and the supporting platform 13 is parallel to the bottom cross beam 14.
Panel unit spare 3 of steel case roof beam 1, adopt regularization positioning fixture 15 to fix a position in the installation of bottom plate unit spare 2, regularization positioning fixture 15 lower part sets up fixed code plate 17, fixed code plate 17 carries out welded fastening with panel unit spare 3 or bottom plate unit spare 2, fixed code plate 17 is fixed with entablature 21 through bolt 23 and screw rod 24, entablature 21 lower part sets up jack 20 and steel sheet 22 and extrudees the location to panel unit spare 3 or bottom plate unit spare 2 seam position, panel unit spare 3 or bottom plate unit spare 2 seam position lower part sets up steel liner 18 and makes things convenient for seam structure welding.
Specifically, one side of the jack 20 is connected with the panel unit element 3 and the bottom plate unit element 2, the other side is connected with the upper cross beam 21, the jack 20 is connected with the panel unit element 3 and the bottom plate unit element 2 through the steel plate 22, the extrusion stress of the jack 20 to the panel unit element 3 and the bottom plate unit element 2 is reduced through the steel plate 22, then, the two sides of the upper cross beam 21 are limited through the jack 20 and the bolt 23, the distance between the upper cross beam 21 and the fixed code plate 17 is limited, and the panel unit element 3 and the bottom plate unit element 2 connected with the fixed code plate 17 are further positioned.
The steel box girder 1 adopts a pre-camber adjusting support 25 to perform pre-camber dynamic adjustment, the lower part of the pre-camber adjusting support 25 is provided with a vertical supporting leg 28, an inclined supporting leg 30 and an inclined support 29, the upper part of the inclined support 29 is provided with a horizontal supporting beam 27, and the upper part of the horizontal supporting beam 27 is provided with a jack 20, a rubber pad 26 and a steel plate 22 to jack the steel box girder 1.
Specifically, a plurality of vertical support legs 28 are arranged on the same plane at the lower part of the pre-camber adjusting bracket 25, an inclined support 29 is connected between two adjacent vertical support legs 28 on the same plane, and the inclined support 29 is obliquely arranged, so that one end of the inclined support 29 is connected to the upper part of one vertical support leg 28 of the two adjacent vertical support legs 28, and the other end of the inclined support 29 is connected to the lower part of the other vertical support leg 28 of the two adjacent vertical support legs 28, so that the inclined support 29 supports the two adjacent vertical support legs 28; the inclined legs 30 are symmetrically arranged on two sides of the vertical leg 28, and the inclined legs 30 are obliquely arranged, so that the inclined legs 30 on two sides of the vertical leg 28 support the side part of the vertical leg 28.
It should be mentioned that the steel plate 22 is located between the jack 20 and the rubber pad 26, one side of the rubber pad 26 abuts against the lower portion of the steel box girder 1, the friction between the steel plate 22 and the steel box girder 1 is increased by the rubber pad 26, and the stress area of the steel box girder 1 is increased by the steel plate 22.
Diaphragm unit spare 4, web unit spare 7 of steel box girder 1 adopt cell board locating support 31 to carry out auxiliary positioning, cell board locating support 31 lower part sets up end crossbeam 14, end crossbeam 14 one side is installed on bottom plate unit spare 2, cell board locating support 31 outside sets up steel bracing 34, cell board locating support 31 middle part sets up multilayer jack fixed platform 33, jack fixed platform 33 front end sets up jack 20 and steel sheet 22 and carries out auxiliary positioning to diaphragm unit spare 4, web unit spare 7 mounted position.
Specifically, the jack fixing platform 33 includes a plurality of "well" shaped structures, the plurality of "well" shaped structures are arranged along the vertical direction, one end of the steel diagonal brace 34 is connected to the bottom beam 14, and the other end of the steel diagonal brace is connected to the vertical side wall of the jack fixing platform 33, so that the bottom beam 14, the steel diagonal brace 34 and the vertical side wall of the jack fixing platform 33 form a triangular structure, and the stability of the jack fixing platform 33 is increased; the diaphragm single element 4 and the web single element 7 are connected with a jack 20 in a unit plate positioning bracket 31 through a steel plate 22, and the mounting positions of the diaphragm single element 4 and the web single element 7 are further positioned.
Wherein the diaphragm unit piece 4 and the web unit piece 7 are connected with the steel plate 22 through a positioning piece such as a bolt, a screw and the like.
The present invention is not limited to the above-mentioned preferred embodiments, and any other products in various forms can be obtained by anyone in the light of the present invention, but any changes in the shape or structure thereof, which have the same or similar technical solutions as those of the present application, fall within the protection scope of the present invention.
Claims (10)
1. A method for manufacturing and constructing a large-section steel box girder is characterized by comprising the following steps:
step one, lofting and blanking of a unit piece (11): carrying out lofting and blanking construction on the unit pieces (11) according to a design drawing, stacking the unit pieces (11) by using a unit piece stacking frame (9) after the unit pieces (11) are machined, and arranging square timbers (12) on the unit piece stacking frame (9) to stack the unit pieces (11) in a layered manner;
step two, welding the base plate unit piece (2): carrying out welding construction on the base plate unit piece (2), positioning and fixing the base plate unit piece (2) by adopting a forming positioning clamp (15) in the welding process, connecting a fixing code plate (17) to the lower part of the forming positioning clamp (15), fixing the fixing code plate (17) and the base plate unit piece (2), fixing the fixing code plate (17) and an upper cross beam (21) through a bolt (23) and a screw (24), extruding and positioning the joint position of the base plate unit piece (2) through a jack (20) and a steel plate (22) at the lower part of the upper cross beam (21), and arranging a steel liner (18) at the lower part of the joint position of the base plate unit piece (2); the pre-camber is dynamically adjusted through a pre-camber adjusting support (25) in the welding process of the bottom plate structure, a jack (20), a rubber pad (26) and a steel plate (22) are arranged at the upper part of a horizontal supporting beam (27) on the pre-camber adjusting support (25) to jack the steel box girder (1), and the pre-camber of the steel box girder (1) is accurately controlled through dynamic monitoring of the stroke of the jack (20);
step three, welding construction of a diaphragm plate single element (4): welding construction of the diaphragm plate unit piece (4) is carried out, auxiliary positioning is carried out by adopting a unit plate positioning support (31), the lower part of the unit plate positioning support (31) is installed on the bottom plate unit piece (2) through a bottom cross beam (14), a plurality of layers of jack fixing platforms (33) are installed in the middle of the unit plate positioning support (31), and the installation position of the diaphragm plate unit piece (4) is positioned by the front end of each jack fixing platform (33) through a jack (20) and a steel plate (22);
step four, welding construction of the web single element (7): welding construction of the web single element (7) is carried out, and a unit plate positioning bracket (31) is adopted for positioning in the installation process;
fifthly, welding construction of the panel unit piece (3): carrying out welding construction on the panel unit piece (3), and fixing by adopting a stereotyped positioning clamp (15) in the welding process;
step six, integrally welding the steel box girder (1): and a pre-camber adjusting bracket (25) is adopted to dynamically adjust the pre-camber in the welding process of the steel box girder (1).
2. The manufacturing and construction method of the large-section steel box girder according to claim 1, characterized in that: the bottom of the steel box girder (1) is provided with a bottom plate unit element (2), the bottom plate unit element (2) is provided with a reinforcing rib (8), the upper part of the bottom plate unit element (2) is provided with a diaphragm plate unit element (4) and a web plate unit element (7), the upper part of the steel box girder (1) is provided with a panel unit element (3), the panel unit element (3) is provided with a U-shaped rib (5), and two sides of the steel box girder (1) are provided with cantilever unit elements (6).
3. The manufacturing and construction method of the large-section steel box girder according to claim 1, characterized in that: the unit piece stacks frame (9) lower part and sets up end crossbeam (14), and unit piece stacks frame (9) one side and sets up vertical stand (10), and unit piece stacks frame (9) upper portion and sets up multilayer supporting platform (13), sets up square timber (12) on supporting platform (13) and carries out the pad, places unit piece (11) on square timber (12).
4. The manufacturing and construction method of the large-section steel box girder according to claim 1, characterized in that: the lower part of the stereotyped positioning clamp (15) is provided with a fixed code plate (17), the fixed code plate (17) is fixed with the panel unit element (3) or the bottom plate unit element (2), the fixed code plate (17) is fixed with an upper cross beam (21) through a bolt (23) and a screw (24), the lower part of the upper cross beam (21) is provided with a jack (20) and a steel plate (22) to extrude and position the joint position of the panel unit element (3) or the bottom plate unit element (2), and the lower part of the joint position of the panel unit element (3) or the bottom plate unit element (2) is provided with a steel liner (18).
5. The manufacturing and construction method of the large-section steel box girder according to claim 1, characterized in that: vertical supporting legs (28), inclined supporting legs (30) and inclined supports (29) are arranged on the lower portion of the pre-camber adjusting support (25), a horizontal supporting beam (27) is arranged on the upper portion of each inclined support (29), and a jack (20), a rubber pad (26) and a steel plate (22) are arranged on the upper portion of each horizontal supporting beam (27) to jack the steel box girder (1).
6. The manufacturing and construction method of the large-section steel box girder according to claim 5, characterized in that: a plurality of vertical supporting legs (28) are arranged on the same plane of the lower portion of the pre-camber adjusting support (25), an inclined support (29) is connected between every two adjacent vertical supporting legs (28) on the same plane, the inclined support (29) is arranged in an inclined mode, one end of the inclined support (29) is connected to the upper portion of one vertical supporting leg (28) of every two adjacent vertical supporting legs (28), and the other end of the inclined support is connected to the lower portion of the other vertical supporting leg (28) of every two adjacent vertical supporting legs (28).
7. The manufacturing and construction method of the large-section steel box girder according to claim 1, characterized in that: the inclined support legs (30) are symmetrically arranged on two sides of the vertical support leg (28), and the inclined support legs (30) are obliquely arranged.
8. The manufacturing and construction method of the large-section steel box girder according to claim 1, characterized in that: and a steel inclined strut (34) is arranged on the outer side of the unit plate positioning bracket (31).
9. The manufacturing and construction method of the large-section steel box girder according to claim 1, characterized in that: the jack fixing platform (33) comprises a plurality of 'well' -shaped structures which are arranged along the vertical direction.
10. The utility model provides a large cross section steel box girder which characterized in that: the large-section steel box girder is obtained by the manufacturing and construction method of the large-section steel box girder as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210062489.XA CN114211212B (en) | 2022-01-19 | 2022-01-19 | Manufacturing and construction method of large-section steel box girder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210062489.XA CN114211212B (en) | 2022-01-19 | 2022-01-19 | Manufacturing and construction method of large-section steel box girder |
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| Publication Number | Publication Date |
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| CN114211212A true CN114211212A (en) | 2022-03-22 |
| CN114211212B CN114211212B (en) | 2022-10-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210062489.XA Expired - Fee Related CN114211212B (en) | 2022-01-19 | 2022-01-19 | Manufacturing and construction method of large-section steel box girder |
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| CN116988569B (en) * | 2023-09-21 | 2023-12-08 | 中铁城建集团第一工程有限公司 | Box-type steel structure and manufacturing process thereof |
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| CN114211212B (en) | 2022-10-21 |
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