CN113699891A - Processing, manufacturing and construction method of prefabricated small box girder hanging bracket - Google Patents
Processing, manufacturing and construction method of prefabricated small box girder hanging bracket Download PDFInfo
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- CN113699891A CN113699891A CN202110993066.5A CN202110993066A CN113699891A CN 113699891 A CN113699891 A CN 113699891A CN 202110993066 A CN202110993066 A CN 202110993066A CN 113699891 A CN113699891 A CN 113699891A
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- 238000010276 construction Methods 0.000 title claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 238000003672 processing method Methods 0.000 title claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 34
- 239000010959 steel Substances 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 31
- 238000009434 installation Methods 0.000 claims abstract description 14
- 238000012545 processing Methods 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims description 20
- 238000013461 design Methods 0.000 claims description 4
- 238000007670 refining Methods 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 4
- 230000003014 reinforcing effect Effects 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 3
- 230000036544 posture Effects 0.000 description 3
- 229910000746 Structural steel Inorganic materials 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram 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
- 238000009417 prefabrication Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000004575 stone Substances 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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
- B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
- B66C1/62—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means comprising article-engaging members of a shape complementary to that of the articles to be handled
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/04—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack
- B66C13/08—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack for depositing loads in desired attitudes or positions
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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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- Bridges Or Land Bridges (AREA)
Abstract
The invention relates to a method for processing, manufacturing and constructing a prefabricated small box girder hanging bracket, which comprises the following steps: the small box girder hanger structure is composed of two hangers, each hanger is provided with 8 waist-shaped hoisting holes, 8 reserved holes are reserved at corresponding positions of the small box girder, and the hangers and the small box girder are connected through high-strength hanger rods/finish-rolled deformed steel bars; each hanger is provided with 2 hoisting lifting lugs which are connected by a hoisting pin rod and can be hoisted by shackle and hoisting equipment; the method for mounting the small box girder and using the small box girder hanging bracket comprises the following steps: transferring and loading the small box girder in a prefabricated part factory through a small box girder hanging bracket; after the small box girder is transported to an installation site, the small box girder is lifted and installed on the top of the cover girder through the small box girder lifting frame, and after the small box girder is lifted and installed, the small box girder lifting frame is detached. The invention solves the problems that the small box girder is difficult to install in a complex environment, the stress of the small box girder structure is uneven under a special hoisting working condition, and the like; the use of the small box girder hanging bracket greatly improves the construction safety and saves the construction cost.
Description
Technical Field
The invention relates to a prefabricated small box girder hanging bracket, in particular to a prefabricated small box girder hanging bracket for prefabricated assembled urban elevated/expressway and a processing, manufacturing and construction method.
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 order to improve the work efficiency of the prefabricated small box girder in the prefabricated component factory and the work efficiency of lifting and installing on a construction site, the urban viaduct and the highway consider the investment of construction work efficiency and cost and the convenience of construction, corresponding lifting points are arranged according to preset positions in the prefabrication process of the small box girder and other components, the prefabricated components are transported to an installation site after the maintenance period of the prefabricated components meets the requirements and are directly lifted and installed by adopting the embedded lifting points, and the lifting hooks are directly cut off by adopting cutting equipment after the lifting is completed.
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 small box girder 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 small box girder; 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-mounting lifting method causes great difficulty in demolding and shifting of the small box girder of the prefabricated part factory, the corners of the small box girder are seriously abraded to the steel wire rope in the field bottom-mounting lifting installation process, the consumption of the steel wire rope is only second to that of the embedded lifting hook, and the small box girder is easily damaged in the lifting process. Therefore, a new method is needed for effectively fixing the hanging bracket and the small box girder through the high-strength hanging rod and the high-strength bolt when the small box girder is hoisted in a complex environment, connecting the hoisting equipment hanging hook with the small box girder hanging bracket shaft pin, enabling the small box girder to incline to the hanging bracket under the working condition of a certain angle, adjusting the posture of the small box girder after the hoisting height exceeds the cover beam and installing the small box girder to the specified beam falling position, enabling the posture of the small box girder to be more flexible when the small box girder is hoisted, and enabling the hanging bracket to be connected with the small box girder and not to cause adverse influence on the small box girder.
Disclosure of Invention
The invention provides a novel method for processing, manufacturing and constructing a prefabricated small box girder hanger, aiming at solving the technical problems that the conventional embedded hanging points on the prefabricated small box girder are difficult to install and fix, the loss of disposable materials is serious, and the angled hoisting of the small box girder cannot be realized.
The invention is realized by the following technical scheme: a method for processing, manufacturing and constructing a prefabricated small box girder hanging bracket comprises the following steps:
structural design and processing manufacturing method of small box girder hanging bracket
(1) Little case roof beam gallows structural design: the small box girder hanger structure is composed of two hangers, each hanger is provided with 8 waist-shaped hoisting holes, 8 reserved holes are reserved at corresponding positions of the small box girder, and the hangers and the small box girder are connected through high-strength hanger rods/finish-rolled deformed steel bars; each hanger is provided with 2 hoisting lifting lugs which are connected by a hoisting pin rod and can be hoisted by shackle and hoisting equipment;
(2) processing and manufacturing the small box girder hanging bracket: selecting materials and processing shapes of the small box girder hanging bracket, and selecting materials of a hanging rod and a bolt matched with the small box girder hanging bracket;
second, small box girder installation and small box girder hanger using method
(1) Transferring and loading the small box girder in a prefabricated part factory through a small box girder hanging bracket;
(2) the small box girder is lifted and installed on the top of the capping beam through the small box girder lifting frame after being transported to an installation site,
(3) and removing the small box girder hanging bracket after the small box girder is hoisted.
Further, the specific method for selecting the material and the processing shape of the small box girder hanging bracket is as follows: according to the weight of the highway and the urban overhead small box girder, the lifting capacity of a single lifting frame is 120t, so that the lifting performance requirement of the existing box girder can be met, the lifting frame adopts the box section of 3 small box bodies, the strength of steel materials is not lower than Q235 grade, and a large box type lifting frame is formed; the steel material of the lifting lug is not lower than Q235 grade, the minimum thickness of the lifting lug and the stiffening plate material is 20mm, and the diameter of the opening of the lifting lug is 140 mm; the shaft pins are 45# and above shaft pins, the diameter of the shaft pins is 140mm, the thickness of steel of a top bottom plate of a box body of the hanger is 20mm, the thickness of other side plates and rib plates is not less than 16mm, the length of the waist-shaped hoisting hole is 160mm multiplied by 55mm, and the waist-shaped hoisting hole is subjected to edge covering treatment by adopting a thin steel plate with the thickness of more than 5mm in the height range of the box body of the hanger and serves as a hanger rod installation guide function.
Further, the concrete method for selecting the materials of the hanger rod and the bolt matched with the small box girder hanger comprises the following steps: each hanger is fixed on a reserved hole of a small box girder top plate by adopting 8 finish-rolled deformed steel bars with the diameter of more than 32, the material of the high-strength hanger rod is 40Cr, and the hanger is subjected to thermal refining treatment, wherein the yield strength is not less than 785MPa, and the shear strength is 180 MPa; the section size of the steel base plate is not too small, and the high-strength nut is made of the same material as the suspender.
Further, the method for mounting the small box girder and using the small box girder hanging bracket comprises the following specific steps: after the small box girder is prefabricated and transported to an installation site, and hoisting holes are reserved according to the relative positions of the holes of the hoisting frames when the small box girder is prefabricated, hoisting the small box girder hoisting frames by adopting hoisting equipment before unloading and connecting and fixing the small box girder hoisting frames and the small box girder by adopting a high-strength hoisting rod; after the hangers at the two ends of the small box girder are completely installed, the small box girder is slowly lifted by adopting lifting equipment, and the girder transporting vehicle drives away from an installation site; the small box girder is longitudinally inclined at a certain angle through the matching of front and rear hoisting equipment and a hanger shaft pin, the small box girder is lifted to the top of the cover girder by adopting a high-low hoisting method below the installed/constructed cover girder, and finally the small box girder is installed to a preset position; and after the small box girder is installed in place, the positions of the center line of the small box girder and the center line of the bent cap support are checked, and after the situation that no fault exists is confirmed, the small box girder hanging bracket is removed to hoist the next small box girder.
Compared with the prior art, the method for hoisting and installing the prefabricated small box girder by the hanging bracket has the beneficial effects that: the method solves the technical and economic problems that the lifting points of the conventional method for embedding the lifting hook comprise a method for installing a steel strand lifting hook and a method for installing a carbon structural steel lifting hook are not uniformly stressed, the steel strands are easily broken one by one, the inclined lifting working condition cannot be realized, the lifting hook is easy to shift in the embedding process, the cost is increased by one-time use, and the like. The hanging bracket and the small box girder mounting method have the advantages of high strength of the hanging bracket, low processing cost, long-term use after one-time investment, easy replacement of wear parts (high-strength screw rods and nuts), capability of realizing longitudinal inclined hoisting of the small box girder, stable hoisting and the like. The method has important reference value on the hoisting safety and technical performance of similar prefabricated small box girders, reduces the construction cost investment, and has remarkable social benefit and economic benefit.
Drawings
FIG. 1 is a three-view illustration of the processing of a small box girder hanger;
wherein: (a) a front view, (b) a left view, (c) a top view;
FIG. 2 is a schematic plan view of the hanger;
FIG. 3 is a longitudinal cross-sectional view of the hanger and eye pin;
FIG. 4 is a cross-sectional view of the hanger and the bail;
FIG. 5 is a schematic view of the connection and fixation of the hanger and the precast box girder boundary beam;
FIG. 6 is a schematic view of connection and fixation of a hanger and a middle beam of a prefabricated small box girder;
FIG. 7 is a schematic diagram of the front relationship between the hoisting equipment and the girder transporting vehicle, the prefabricated small box girder and the small box girder hanging bracket;
FIG. 8 is a schematic view of a hoisting device for obliquely hoisting a prefabricated box girder through a hoisting frame;
fig. 9 is a schematic view of the spreader removed after the mini-box girder is mounted to a predetermined position.
Detailed Description
In order to fully clarify the advantages of the present invention, embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The invention takes the displacement, lifting and installation of the prefabricated small box girder with the bottom width of 1.5m as an example, and the working condition of lifting and installing the small box girder with the bottom width of 1.2m is the same as that of the small box girder with the bottom width of 1.5 m.
As shown in (a), (b), (c) of fig. 1:
according to the small box girder cross-sectional dimension, the hanger cross-sectional dimension is set, the hanger mainly comprises three rectangular boxes, the reinforcing rib plate 2 is arranged on the inner side of the box body 1, each hanger is provided with 2 lifting lugs 3, the holes of the lifting lugs 3 and the cross-sectional dimension of the lifting shaft pins 4 are arranged according to the lifting load, and one hanger is provided with eight waist-shaped lifting holes 5.
As shown in fig. 2:
and the steel sheet is adopted in the hole for surrounding treatment, so that the hanger rod is convenient to mount, dismount and mount. The reinforcing rib plate 2 is arranged on the inner side of the hanger box body 1, is level in appearance, and is not easy to damage hoisting tools such as operators and steel wire ropes.
As shown in fig. 3:
the hoisting shaft pins 4 are longitudinally parallel to the hanging bracket, the periphery of the lifting lugs 3 is reinforced by the stiffening plates 6, and the top and bottom surfaces of the waist-shaped hoisting holes 5 are reinforced by steel plates respectively, so that the integrity of the hanging bracket is greatly improved.
As shown in fig. 4:
the arrangement number of the reinforcing rib plates 2 of the hanger determines the lifting performance of the hanger to a certain extent. The cavities among the reinforcing rib plates 2 do not need to be filled, so that the weight of the hanger can be reduced.
As shown in fig. 5:
the small box girder 7 lifts the front hanger and is installed on the side box girder with the crash barrier 8 through the high-strength hanger rod 9, the steel backing plate 10 and the fixing nut 11. Before the hanger is installed, the hanger is aligned with a reserved hoisting hole 12 on the top plate of the small box girder 1 through a waist-shaped hoisting hole 5 on the hanger, and the hanger cannot be influenced with the anti-collision guardrail 8 of the boundary beam; the longitudinal direction of the hanger and the transverse direction of the small box girder 7 are kept parallel, and the hoisting shaft pin 4 on the hanger and the longitudinal direction of the hanger are kept parallel.
As shown in fig. 6:
the connection between the hanger and the middle beam of the small box girder is not affected by the side anti-collision wall, the lifting relative to the side beam is more convenient, the fixing form of the hanger is the same as that of the side beam, and the specific detailed position can be properly adjusted in the actual construction process.
As shown in fig. 7:
after the small box girder 7 is transported to a construction site, the girder transporting vehicle is parked under hoisting equipment, front and rear hangers are installed, the torque force value of the high-strength bolt is checked, the appearance quality and the qualification certificate of the concrete prefabricated part are checked, whether the mileage direction of the small box girder is wrong is rechecked before hoisting, and the plane position and the elevation of the stone on the capping beam/pier cap are rechecked; after the detection is correct, the steel wire ropes of front and rear trolleys of the hoisting equipment are fixed with the hanging bracket, and the front and rear hoisting trolleys are synchronously lifted by about 30cm for trial hoisting; and driving the ground transport vehicle away from the construction site without errors.
As shown in fig. 8:
after the ground girder transporting vehicle is driven away, the front and rear trolleys of the hoisting equipment are operated to be lifted asynchronously by combining the actual conditions on site through the relation between the lifting lugs and the shaft pins of the front and rear trolleys of the hoisting equipment and the lifting frame, so that after the small box girder forms a certain angle longitudinally, the front and rear trolleys are synchronously translated and lifted (or are lifted after being translated, and the attitude of the small box girder in the air is adjusted according to the sequence), and after the small box girder and the installed capping beam/pier cap keep a safe distance of 300-500 mm, the small box girder is lifted to the top of the capping beam under the working condition of a certain longitudinal inclination angle.
As shown in fig. 9:
after the trolley lifts the small box girder 7 to the top of the cover beam 13, the hoisting height of the trolley is adjusted, and the longitudinal and transverse postures of the small box girder 7 are adjusted to be flat; and (3) horizontally moving the hoisting equipment in the transverse bridge direction, mounting the small box girder 7 to a preset girder falling position, rechecking the front and rear plane position and the elevation of the small box girder 7, removing the high-strength suspender on the small box girder, removing the small box girder hanger 100, and hoisting the next small box girder.
The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the above-mentioned embodiment.
Claims (4)
1. A method for processing, manufacturing and constructing a prefabricated small box girder hanging bracket is characterized by comprising the following steps:
small box girder hanging bracket structure design and processing and manufacturing method
(1) Little case roof beam gallows structural design: the small box girder hanger structure is composed of two hangers, each hanger is provided with 8 waist-shaped hoisting holes, 8 reserved holes are reserved at corresponding positions of the small box girder, and the hangers and the small box girder are connected through high-strength hanger rods/finish-rolled deformed steel bars; each hanger is provided with 2 hoisting lifting lugs which are connected by a hoisting pin rod and can be hoisted by shackle and hoisting equipment;
(2) processing and manufacturing the small box girder hanging bracket: selecting materials and processing shapes of the small box girder hanging bracket, and selecting materials of a hanging rod and a bolt matched with the small box girder hanging bracket;
second, small box girder installation and small box girder hanger using method
(1) Transferring and loading the small box girder in a prefabricated part factory through a small box girder hanging bracket;
(2) the small box girder is lifted and installed on the top of the cover girder through the small box girder lifting frame after being transported to an installation site;
(3) and removing the small box girder hanging bracket after the small box girder is hoisted.
2. The processing, manufacturing and construction method of the prefabricated small box girder hanging bracket according to claim 1, characterized in that: the specific method for selecting the material and the processing shape of the small box girder hanging bracket is as follows: according to the weight of the highway and the urban overhead small box girder, the lifting capacity of a single lifting frame is 120t, so that the lifting performance requirement of the existing box girder can be met, the lifting frame adopts the box section of 3 small box bodies, the strength of steel materials is not lower than Q235 grade, and a large box type lifting frame is formed; the steel material of the lifting lug is not lower than Q235 grade, the minimum thickness of the lifting lug and the stiffening plate material is 20mm, and the diameter of the opening of the lifting lug is 140 mm; the shaft pins are 45# and above shaft pins, the diameter of the shaft pins is 140mm, the thickness of steel of a top bottom plate of a box body of the hanger is 20mm, the thickness of other side plates and rib plates is not less than 16mm, the length of the waist-shaped hoisting hole is 160mm multiplied by 55mm, and the waist-shaped hoisting hole is subjected to edge covering treatment by adopting a thin steel plate with the thickness of more than 5mm in the height range of the box body of the hanger and serves as a hanger rod installation guide function.
3. The processing, manufacturing and construction method of the prefabricated small box girder hanging bracket according to claim 1, characterized in that: the concrete method for selecting the materials of the hanger rod and the bolt matched with the small box girder hanger comprises the following steps: each hanger is fixed on a reserved hole of a small box girder top plate by adopting 8 finish-rolled deformed steel bars with the diameter of more than 32, the material of the high-strength hanger rod is 40Cr, and the hanger is subjected to thermal refining treatment, wherein the yield strength is not less than 785MPa, and the shear strength is 180 MPa; the section size of the steel base plate is not too small, and the high-strength nut is made of the same material as the suspender.
4. The processing, manufacturing and construction method of the prefabricated small box girder hanging bracket according to claim 1, characterized in that: the method for mounting the small box girder and using the small box girder hanging bracket comprises the following specific steps: after the small box girder is prefabricated and transported to an installation site, and hoisting holes are reserved according to the relative positions of the holes of the hoisting frames when the small box girder is prefabricated, hoisting the small box girder hoisting frames by adopting hoisting equipment before unloading and connecting and fixing the small box girder hoisting frames and the small box girder by adopting a high-strength hoisting rod; after the hangers at the two ends of the small box girder are completely installed, the small box girder is slowly lifted by adopting lifting equipment, and the girder transporting vehicle drives away from an installation site; the small box girder is longitudinally inclined at a certain angle through the matching of front and rear hoisting equipment and a hanger shaft pin, the small box girder is lifted to the top of the cover girder by adopting a high-low hoisting method below the installed/constructed cover girder, and finally the small box girder is installed to a preset position; and after the small box girder is installed in place, the positions of the center line of the small box girder and the center line of the bent cap support are checked, and after the situation that no fault exists is confirmed, the small box girder hanging bracket is removed to hoist the next small box girder.
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| CN202110993066.5A CN113699891A (en) | 2021-08-27 | 2021-08-27 | Processing, manufacturing and construction method of prefabricated small box girder hanging bracket |
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| CN202110993066.5A CN113699891A (en) | 2021-08-27 | 2021-08-27 | Processing, manufacturing and construction method of prefabricated small box girder hanging bracket |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114000425A (en) * | 2021-11-29 | 2022-02-01 | 中铁二院工程集团有限责任公司 | Prefabricated bridge deck structure of steel-concrete composite beam and construction method thereof |
| CN114541248A (en) * | 2022-03-24 | 2022-05-27 | 中建八局第三建设有限公司 | Variable-slope large-section prefabricated superposed beam lifting lug structure and construction method thereof |
| CN114635363A (en) * | 2022-03-23 | 2022-06-17 | 保利长大工程有限公司 | I-beam height hoisting installation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114000425A (en) * | 2021-11-29 | 2022-02-01 | 中铁二院工程集团有限责任公司 | Prefabricated bridge deck structure of steel-concrete composite beam and construction method thereof |
| CN114635363A (en) * | 2022-03-23 | 2022-06-17 | 保利长大工程有限公司 | I-beam height hoisting installation method |
| CN114541248A (en) * | 2022-03-24 | 2022-05-27 | 中建八局第三建设有限公司 | Variable-slope large-section prefabricated superposed beam lifting lug structure and construction method thereof |
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