CN114541248A - Variable-slope large-section prefabricated superposed beam lifting lug structure and construction method thereof - Google Patents
Variable-slope large-section prefabricated superposed beam lifting lug structure and construction method thereof Download PDFInfo
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- CN114541248A CN114541248A CN202210302029.XA CN202210302029A CN114541248A CN 114541248 A CN114541248 A CN 114541248A CN 202210302029 A CN202210302029 A CN 202210302029A CN 114541248 A CN114541248 A CN 114541248A
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- 238000010276 construction Methods 0.000 title claims abstract description 22
- 239000002131 composite material Substances 0.000 claims abstract description 36
- 229910000831 Steel Inorganic materials 0.000 claims description 30
- 239000010959 steel Substances 0.000 claims description 30
- 238000000034 method Methods 0.000 claims description 17
- 239000011150 reinforced concrete Substances 0.000 claims description 13
- 238000009434 installation Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 5
- 239000004567 concrete Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000009417 prefabrication Methods 0.000 claims description 3
- 239000003351 stiffener Substances 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 229910000746 Structural steel Inorganic materials 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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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
- E01D19/00—Structural or constructional details of bridges
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
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Abstract
The invention provides a lifting lug structure of a variable-slope large-section prefabricated superposed beam, which comprises a lifting lug main plate, wherein the upper part of the lifting lug main plate is provided with a lifting hole, the lower part of the lifting lug main plate is provided with a lifting lug stiffening plate, the bottom end of the lifting lug main plate is provided with a lifting lug bottom plate, and the lifting lug bottom plate is provided with a plurality of mounting holes. The invention further provides a construction method for the variable-slope large-section prefabricated superposed beam lifting lug structure. The invention solves the problems that the composite beam is difficult to install in a complex environment, the stress of the composite beam structure is uneven under a special hoisting working condition and the like, greatly improves the construction safety and saves the construction cost.
Description
Technical Field
The invention relates to the technical field of composite beam hoisting construction, in particular to a lifting lug structure of a prefabricated composite beam with a variable slope and a large section and a construction method thereof.
Background
With the acceleration of social development pace, prefabricated assembly components become the mainstream of modern construction, and urban elevated buildings and highways have more and more common use frequency of the prefabricated components.
In consideration of construction efficiency and cost input and construction convenience, in order to improve the efficiency of displacement of a prefabricated composite beam in a prefabricated part factory and lifting and mounting on a construction site, corresponding lifting points are arranged according to preset positions in the prefabrication process of the prefabricated composite beam and other components, the prefabricated composite beam is transported to the mounting site after the maintenance period of the prefabricated component meets the requirements and is directly lifted and mounted by adopting the embedded lifting points, and the lifting hooks are directly cut off by adopting cutting equipment after the lifting is finished.
The conventional methods for embedding the lifting hook comprise a steel strand lifting hook installing method, a carbon structure steel lifting hook installing method and the like, the conventional methods for not embedding the lifting hook mainly comprise a steel wire rope pocket bottom hoisting method, but the steel strand lifting hook is installed by combining a plurality of steel strands side by side for use, and when the superposed beam is inclined at any angle, the steel strand lifting hook is converted from a plurality of synchronous stress into a single stress, so that the danger that the steel strands are broken one by one is easily caused; the condition of installing the carbon structure steel lifting hook is similar to that of a steel strand lifting hook, and the installation is only limited to horizontal stable hoisting of the superposed beam; the steel strand lifting hook and the carbon structural steel lifting hook have high requirements on anchoring length, the anchoring end needs to be provided with a corresponding anchor plate according to calculation requirements and is only used once, and the disposable use of a large amount of materials is not in accordance with the concept of energy conservation and environmental protection; the conventional non-embedded lifting hook bottom-pocket lifting method causes great difficulty in demolding and shifting of the laminated beam in a prefabricated part factory, corners of the laminated beam are seriously abraded to a steel wire rope in the installation process of the on-site bottom-pocket lifting, the consumption of the steel wire rope is only second to that of the embedded lifting hook, and the adverse effects such as damage of the appearance of the laminated beam and the like are easily caused in the lifting process.
Disclosure of Invention
The invention provides a variable-slope large-section prefabricated composite beam lifting lug structure and a construction method thereof in order to overcome the defects of the prior art, and aims to solve the technical problems that conventional embedded lifting points on the existing prefabricated composite beam are difficult to install and fix, the loss of disposable materials is serious, and the horizontal lifting of the composite beam cannot be realized.
The technical scheme adopted by the invention for overcoming the technical problems is as follows: the utility model provides a prefabricated superposed beam lug structure of variable slope large-section, includes the lug mainboard, the upper portion of lug mainboard is equipped with the jack-up lewis hole, the lower part of lug mainboard is equipped with lug stiffener, the bottom of lug mainboard is equipped with the lug bottom plate, be equipped with a plurality of mounting holes on the lug bottom plate.
Preferably, the lifting lug is made of steel material not lower than Q355 grade.
Preferably, the minimum thickness of the lifting lug main plate is 32mm, the minimum thickness of the lifting lug stiffening plate is 30mm, and the minimum thickness of the lifting lug bottom plate is 44 mm.
The invention also provides a construction method for the variable-slope large-section prefabricated superposed beam lifting lug structure, which comprises the following steps of:
s1, in the process of prefabricating the composite beam, arranging a plurality of fixing holes corresponding to the mounting holes on the composite beam, pouring a reinforced concrete wet joint at the upper end of the composite beam, arranging a plurality of preformed holes corresponding to the mounting holes on the reinforced concrete wet joint, transporting the composite beam to the site after prefabrication is completed, lifting the lifting lug structure, enabling the lifting lug bottom plate to be closely attached to the top surface of the reinforced concrete wet joint, enabling the lifting lug main plate to be vertical, sequentially penetrating the mounting holes, the preformed holes and the fixing holes by using a lifting rod, and fastening by using nuts;
s2, mounting a plurality of lifting lug structures on the superposed beam by adopting the method in the step 1, and realizing the vertical consistency of the lifting lug structures and the top elevation consistency by using the lifting lug structure combinations with different sizes;
s3, after the 8 lifting lug structures of one laminated beam are completely installed, slowly lifting the laminated beam, driving the laminated beam away from an installation site through a beam transporting ship, hoisting the laminated beam to an installed/constructed cover beam or a bracket, and finally installing the laminated beam to a preset position;
and S4, after the composite beam is installed in place, whether the central line of the composite beam is consistent with the designed line type of the bridge or not is checked, and the lifting lug structure is removed after the error is determined to hoist the next composite beam.
Preferably, in S1, before the installation of the lifting lug structure, a retaining wall steel pipe is embedded in the prepared hole of the cast concrete in advance.
Preferably, in S1, the upper part of the hanger bar is fastened by a flat nut, the lower part is fastened by a cone nut, and a steel backing plate is installed between the cone nut and the wet joint of the reinforced concrete.
Preferably, in S1, the yield strength of the suspender is more than or equal to 235MPa, the tensile strength is more than or equal to 365MPa, and the elongation is more than or equal to 25%.
Preferably, the thickness of the steel backing plate is 35-44 mm.
Compared with the prior art, the invention has the beneficial effects that: the lifting lugs are adopted for lifting when the prefabricated superposed beam is installed, and the technical and economic problems that the lifting points of a conventional method for embedding the lifting hooks, namely a method for installing steel strand lifting hooks and a method for installing carbon structural steel lifting hooks, are not uniformly stressed, the steel strands are easily broken one by one, the working condition of inclined lifting cannot be realized, the lifting hooks are easy to shift in the embedding process, the cost is increased due to one-time use and the like are solved. The installation method of the lifting lug and the composite beam has the advantages of high strength of the lifting lug, low processing cost, long-term recycling after one-time investment, easy replacement of abrasion accessories (high-strength screw rods and nuts), realization of horizontal lifting of the composite beam, stable lifting and the like. The method has important reference values on the hoisting safety, stability and technical performance of similar prefabricated superposed beams, reduces the construction cost investment, and has remarkable social benefit and economic benefit.
Drawings
Fig. 1 is a structural schematic diagram of the construction of a lifting lug of a variable-slope large-section prefabricated superposed beam.
Fig. 2 and 3 are partial structural schematic diagrams of fig. 1.
FIG. 4 is a construction schematic diagram of a variable-slope large-section prefabricated composite beam structure.
Fig. 5 is a partial structural view of fig. 4.
In the figure, 1, a lifting lug main plate; 2. hoisting holes; 3. the lifting lug stiffening plate; 4. a lifting lug bottom plate; 5. a boom; 6. a flat nut; 7. a wall protecting steel pipe; 8. a steel backing plate; 9. a cone nut; 10. wet reinforced concrete joints; 11. a composite beam; 12. a spreader; 13. hoisting the distribution beam; 14. hoisting equipment.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained by combining the specific drawings.
Examples
A lifting lug structure of a prefabricated superposed beam with a variable slope and a large cross section, as shown in figures 1-3, comprises a lifting lug main plate 1, wherein the upper part of the lifting lug main plate 1 is provided with a hoisting hole 2, the diameter of the hoisting hole 2 is 160mm, it can be connected with hoisting equipment through pivot + hoist and carry out the hoist and mount operation, jack-up lifting eye 2 adopts and is greater than or equal to 50T level to break out and be connected with the hoist, the lower part of lug mainboard 1 is equipped with lug stiffening plate 3, 3 fillet weld welded fastening of lug stiffening plate strengthens, locate the side about lug mainboard 1, each side respectively sets up two, the bottom of lug mainboard 1 is equipped with lug bottom plate 4, lug bottom plate 4 full penetration welded fastening, lug bottom plate 4 is along lug mainboard 1 left and right sides direction horizontal arrangement, lug stiffening plate 3 and lug mainboard 1, lug bottom plate 4 half penetration welded fastening strengthens, be equipped with 8 evenly distributed's mounting hole on lug bottom plate 4, the length of mounting hole is 450mm x 32 mm.
Furthermore, the lifting lug structure is made of steel materials not lower than Q355 grade, and according to the weight of the highway and the urban overhead composite beam, the lifting capacity of a single lifting lug structure is 50t, so that the lifting performance requirement of the existing box beam can be met. The minimum thickness of the lifting lug main plate 1 is 32mm, the minimum thickness of the lifting lug stiffening plate 3 is 30mm, and the minimum thickness of the lifting lug bottom plate 4 is 44 mm.
The construction method for the variable-slope large-section prefabricated superposed beam lifting lug structure comprises the following steps of:
s1, in the process of prefabricating the composite beam 11, arranging fixing holes corresponding to the mounting holes on the composite beam 11, pouring a reinforced concrete wet joint 10 at the upper end of the composite beam 11, arranging a through reserved hole corresponding to the mounting hole on the reinforced concrete wet joint 10, embedding a wall protecting steel pipe 7 with the diameter of 32mm and the diameter of 3mm in the reserved hole to serve as the mounting guiding protection function of a later-stage suspender 5, transporting the prefabricated composite beam 11 to the site, hoisting the lifting lug structure by adopting hoisting equipment, closely attaching a lifting lug bottom plate 4 to the top surface of the reinforced concrete wet joint 10 to keep the lifting lug main plate 1 vertical, adjusting the height of the lifting lug main plate 1 to ensure that the top surface elevation of the lifting lug structure is consistent, sequentially penetrating the mounting holes, the reserved holes and the fixing holes by adopting the suspender 5, fastening and connecting the suspender by a nut, fastening the upper part of the suspender 5 by a high-strength flat nut 6 and fastening the lower part by a high-strength cone nut 9, a steel backing plate 8 is arranged between the cone nut 9 and the reinforced concrete wet joint 10;
s2, mounting the lifting lug structures on the superposed beam 11 by the method in the step 1, wherein each transverse lifting section of the superposed beam 11 is formed into a group by 4 lifting lug structures, each superposed beam comprises 8 lifting lug structures in total with 2 lifting sections, and the lifting lug structures are vertically consistent with the top elevation by using lifting lug structure combinations with different sizes so as to ensure that the superposed beam 11 is lifted under the horizontal working condition;
s3, after 8 lifting lug structures of one superposed beam are completely installed, checking and accepting the torque force value of the lifting rod 5, checking the appearance quality and a qualification certificate of the concrete prefabricated part, rechecking whether the mileage direction of the superposed beam is wrong or not before lifting, and rechecking the plane position and the elevation of the cover beam/bracket 15; after the inspection is correct, the hoisting distribution beam 13 and the hoisting holes 2 arranged on the superposed beam 11 are fixedly connected through the hoisting device 12, after the inspection is correct, the superposed beam 11 is slowly lifted by about 30cm for trial hoisting, and after the inspection is correct, the superposed beam is driven away from the installation site through a beam transporting ship, after the hoisting device 14 lifts the superposed beam 11 to the top of the capping beam/bracket 15, the front, rear, left and right positions of the superposed beam 11 are adjusted, and the superposed beam 11 is hoisted to a preset beam falling position;
s4, after the superposed beams are installed in place, whether the central line of the superposed beam is consistent with the designed line of the bridge or not is checked, the suspender 5, the flat nut 6 and the cone nut 9 are removed after the error is confirmed, the connection between the superposed beam 11 and the lifting lug structure is removed, and the next superposed beam is hoisted.
Furthermore, the hanger rod 5 is made of PSB830 and above 25-grade finish-rolled deformed steel bar, the yield strength is more than or equal to 235MPa, the tensile strength is more than or equal to 365MPa, the elongation is more than or equal to 25%, the section size of the steel base plate 8 is 250 x 160mm, and the thickness can be 35-44 mm.
According to the invention, the lifting lug structure and the superposed beam 11 are effectively fixed through the high-strength finish rolling deformed steel bar and the high-strength nut, the lifting appliance 12 of the hoisting equipment 14 is connected with the shackle of the lifting lug of the superposed beam, the line type of the superposed beam 11 is combined, the height of the lifting lug main board 1 and the gradient and the thickness of the lifting lug bottom board 4 are adjusted to manufacture lifting lugs with different sizes, the lifting lugs with different sizes are combined for use to realize the consistency of the vertical lifting lug and the top elevation, the lifting of the superposed beam under the horizontal working condition can be ensured, the posture of the superposed beam 11 is adjusted after the lifting height exceeds the capping beam/support 15 and the superposed beam 11 is installed to a designated beam falling position, the posture of the superposed beam 11 is more flexible during hoisting, and the connection of the lifting lug structure and the superposed beam 11 does not cause adverse effect on the superposed beam.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides a prefabricated superposed beam lug structure of variable slope large-section, its characterized in that, includes the lug mainboard, the upper portion of lug mainboard is equipped with the jack-up lifting eye, the lower part of lug mainboard is equipped with lug stiffener, the bottom of lug mainboard is equipped with the lug bottom plate, be equipped with a plurality of mounting holes on the lug bottom plate.
2. The variable-slope large-section precast composite beam lifting lug structure according to claim 1, wherein the lifting lug structure is made of steel materials not lower than Q355 grade.
3. The variable-slope large-section precast composite beam lifting lug structure according to claim 1, wherein the minimum thickness of the lifting lug main plate is 32mm, the minimum thickness of the lifting lug stiffening plate is 30mm, and the minimum thickness of the lifting lug bottom plate is 44 mm.
4. A construction method for constructing a lifting lug structure of a variable-slope large-section precast composite beam as claimed in any one of claims 1 to 3, which is characterized by comprising the following steps:
s1, in the process of prefabricating the composite beam, arranging a plurality of fixing holes corresponding to the mounting holes on the composite beam, pouring a reinforced concrete wet joint at the upper end of the composite beam, arranging a plurality of preformed holes corresponding to the mounting holes on the reinforced concrete wet joint, transporting the composite beam to the site after prefabrication is completed, lifting the lifting lug structure, enabling the lifting lug bottom plate to be closely attached to the top surface of the reinforced concrete wet joint, enabling the lifting lug main plate to be vertical, sequentially penetrating the mounting holes, the preformed holes and the fixing holes by using a lifting rod, and fastening by using nuts;
s2, mounting a plurality of lifting lug structures on the superposed beam by adopting the method in the step 1, and realizing the vertical consistency of the lifting lug structures and the top elevation consistency by using the lifting lug structure combinations with different sizes;
s3, after the 8 lifting lug structures of one laminated beam are completely installed, slowly lifting the laminated beam, driving the laminated beam away from an installation site through a beam transporting ship, hoisting the laminated beam to an installed/constructed cover beam or a bracket, and finally installing the laminated beam to a preset position;
and S4, after the composite beam is installed in place, whether the central line of the composite beam is consistent with the designed line type of the bridge or not is checked, and the lifting lug structure is removed after the error is determined to hoist the next composite beam.
5. The construction method according to claim 4, wherein in S1, before the installation of the lifting lug structure, a wall-protecting steel pipe is embedded in the prepared hole of the cast concrete in advance.
6. The construction method according to claim 4, wherein in S1, the upper part of the hanger rod is fastened by a flat nut, the lower part is fastened by a cone nut, and a steel shim plate is installed between the cone nut and the wet joint of the reinforced concrete.
7. The construction method according to claim 4, wherein in S1, the yield strength of the hanger rod is not less than 235MPa, the tensile strength is not less than 365MPa, and the elongation is not less than 25%.
8. The construction method according to claim 6, wherein the thickness of the steel backing plate is 35-44 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210302029.XA CN114541248A (en) | 2022-03-24 | 2022-03-24 | Variable-slope large-section prefabricated superposed beam lifting lug structure and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210302029.XA CN114541248A (en) | 2022-03-24 | 2022-03-24 | Variable-slope large-section prefabricated superposed beam lifting lug structure and construction method thereof |
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| CN114541248A true CN114541248A (en) | 2022-05-27 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101026012B1 (en) * | 2010-11-25 | 2011-03-30 | (주) 한국비계 | Bridge deck dismantling method by means of united pulling jack and pier |
| CN207713242U (en) * | 2017-10-31 | 2018-08-10 | 中交二公局第二工程有限公司 | Suspender equipment suitable for the asynchronous lifting construction of steel-concrete composite beam cable-stayed bridge girder |
| CN109183620A (en) * | 2018-09-05 | 2019-01-11 | 广东省长大公路工程有限公司 | Telescoping bracket, steel box-girder hanging device and hanging method |
| CN209941509U (en) * | 2019-04-17 | 2020-01-14 | 中交路桥建设有限公司 | Temporary connecting device for mid-span closure construction of steel-concrete composite beam cable-stayed bridge |
| CN111648234A (en) * | 2020-06-30 | 2020-09-11 | 中铁第四勘察设计院集团有限公司 | Steel-concrete composite beam concrete bridge deck slab capable of being constructed quickly and hoisting system thereof |
| CN214003773U (en) * | 2020-12-28 | 2021-08-20 | 中交一公局第二工程有限公司 | Assembled multi-wing D-shaped lifting lug |
| CN113699891A (en) * | 2021-08-27 | 2021-11-26 | 上海市基础工程集团有限公司 | Processing, manufacturing and construction method of prefabricated small box girder hanging bracket |
-
2022
- 2022-03-24 CN CN202210302029.XA patent/CN114541248A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101026012B1 (en) * | 2010-11-25 | 2011-03-30 | (주) 한국비계 | Bridge deck dismantling method by means of united pulling jack and pier |
| CN207713242U (en) * | 2017-10-31 | 2018-08-10 | 中交二公局第二工程有限公司 | Suspender equipment suitable for the asynchronous lifting construction of steel-concrete composite beam cable-stayed bridge girder |
| CN109183620A (en) * | 2018-09-05 | 2019-01-11 | 广东省长大公路工程有限公司 | Telescoping bracket, steel box-girder hanging device and hanging method |
| CN209941509U (en) * | 2019-04-17 | 2020-01-14 | 中交路桥建设有限公司 | Temporary connecting device for mid-span closure construction of steel-concrete composite beam cable-stayed bridge |
| CN111648234A (en) * | 2020-06-30 | 2020-09-11 | 中铁第四勘察设计院集团有限公司 | Steel-concrete composite beam concrete bridge deck slab capable of being constructed quickly and hoisting system thereof |
| CN214003773U (en) * | 2020-12-28 | 2021-08-20 | 中交一公局第二工程有限公司 | Assembled multi-wing D-shaped lifting lug |
| CN113699891A (en) * | 2021-08-27 | 2021-11-26 | 上海市基础工程集团有限公司 | Processing, manufacturing and construction method of prefabricated small box girder hanging bracket |
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