CN113802461B - Steel box girder erection method - Google Patents

Steel box girder erection method Download PDF

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Publication number
CN113802461B
CN113802461B CN202111136900.5A CN202111136900A CN113802461B CN 113802461 B CN113802461 B CN 113802461B CN 202111136900 A CN202111136900 A CN 202111136900A CN 113802461 B CN113802461 B CN 113802461B
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steel box
section
box girder
girder
crane
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CN113802461A (en
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周文
孟庆
缪晨辉
郑震
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China Railway Guangzhou Engineering Group Co Ltd CRECGZ
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China Railway Guangzhou Engineering Group Co Ltd CRECGZ
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    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D21/00Methods or apparatus specially adapted for erecting or assembling bridges
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2/00Bridges characterised by the cross-section of their bearing spanning structure
    • E01D2/04Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D21/00Methods or apparatus specially adapted for erecting or assembling bridges
    • E01D21/10Cantilevered erection

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Bridges Or Land Bridges (AREA)

Abstract

The invention discloses a method for erecting a steel box girder, which relates to the technical field of bridge construction and comprises the following steps: performing cast-in-place concrete girder construction; setting up a steel-concrete combined section bracket in the midspan direction below the design position of the steel-concrete combined section; a storage device is arranged below the design position of the 1# section steel box girder and used for storing the 1# section steel box girder; hoisting the reinforced concrete combined section to a reinforced concrete combined section support by using a floating crane, and hoisting the 1# section steel box girder to the storage device by using the floating crane; hoisting the 1# section steel box girder into position by using a girder erection crane and installing; and (5) erecting the rest segment steel box girders until the steel box girders are erected. The storage device is installed on the ground at the river side, and after the 1# section steel box girder is hoisted on the storage device by the floating crane, the floating crane can be returned to the ground in advance, so that the use cost of the floating crane is reduced, and the erection construction cost of the 1# section steel box girder is reduced. The problems of long construction period, high cost and high safety risk of erecting the underwater ultrahigh bracket required for erecting the 1# section steel box girder are also avoided.

Description

Steel box girder erection method
Technical Field
The invention relates to the technical field of bridge construction, in particular to a method for erecting a steel box girder.
Background
For large steel-concrete combined bridges crossing rivers, the 1# section steel box girder is often higher from the water surface, and the 1# section steel box girder hoisting construction is carried out by adopting a mode of inserting and beating or constructing and assembling high-altitude large brackets and combining a large floating crane. The construction of the 1# section steel box girder is carried out on the high-altitude large support, so that the construction difficulty is high, the safety risk is high, the construction period is long, the engineering cost is high, the construction quality and the progress of the bridge are affected, and the construction period and the enterprise benefit are difficult to guarantee.
When the 1# section steel box girder is positioned above the cliff side slope, the flat top barge cannot be close to the construction position of the 1# section steel box girder, and the 1# section steel box girder cannot be erected by adopting the modes of barge transportation in place and direct amplitude erection of the steel box girder section by the girder erection crane. The 1# section steel box girder is erected by installing the high-altitude bracket and combining the floating crane, the cost investment is high, the construction period is long, and the construction economy and safety are poor.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, aiming at the erection construction of the land 1# section steel box girder under the condition of limited terrain at the river side, the invention provides a steel box girder erection method, which solves the problems of long construction period, high cost and high safety risk of erecting an underwater ultrahigh support in the erection of the 1# section steel box girder.
The method for erecting the steel box girder comprises the following steps: performing cast-in-place concrete girder construction; setting up a steel-concrete combined section bracket in the midspan direction below the design position of the steel-concrete combined section; a storage device is arranged below the design position of the 1# section steel box girder and used for storing the 1# section steel box girder; hoisting the reinforced concrete combined section to a reinforced concrete combined section support by using a floating crane, and hoisting the 1# section steel box girder to the storage device by using the floating crane; hoisting the 1# section steel box girder into position by using a girder erection crane and installing; and (5) erecting the rest segment steel box girders until the steel box girders are erected.
Further, the storage device comprises a cross beam, a longitudinal beam, a pile top distribution beam, a front pull rod and a rear pull rod, wherein one end of the longitudinal beam is fixed on a bearing platform through an anchoring device, the other end of the longitudinal beam is arranged in a cantilever manner along the midspan direction, a plurality of cross beams are erected at the cantilever ends of the longitudinal beam, the pile top distribution beam is vertically arranged on a ground low-level support, one end of the front pull rod is connected with the cantilever ends of the longitudinal beam, the other end of the front pull rod is connected with the top end of the pile top distribution beam, one end of the rear pull rod is connected with the top end of the pile top distribution beam, and the other end of the rear pull rod is connected with one end of the longitudinal beam on the bearing platform.
Further, the steel-concrete combined section support is installed in a mode that inclined supporting legs are combined with cantilever longitudinal beams, so that the spanning capacity of the steel-concrete combined section support is improved.
And further, after the steel-concrete combined section is adjusted to a designed position, pouring concrete of the fourth section concrete beam and the steel-concrete combined section combined beam, tensioning the longitudinal prestress steel beam, and installing the No. 1 stay cable and the No. 2 stay cable after the strength of the concrete meets the requirement.
Further, before hoisting the 1# section steel box girder, assembling a frame girder crane on the steel-concrete combined section by utilizing a main tower crane, carrying out a load test on the frame girder crane, and hoisting the 1# section steel box girder after the load test is qualified.
Further, the suspension splicing construction sequence of the No. 1 segment steel box girder comprises the following steps: the lifting appliance of the girder erection crane is connected with the 1# section steel box girder; lifting a 1# section steel box girder; the amplitude of the girder erection crane is increased horizontally; lifting the 1# section steel box girder again; the amplitude of the girder erection crane is reduced horizontally; aligning the 1# section steel box girder with the reinforced concrete combination section; temporarily connecting the 1# section steel box girder; fixedly connecting a 1# section steel box girder with the reinforced concrete combination section; installing a No. 3 stay cable on the No. 1 section steel box girder and tensioning for the first time; and (5) moving the girder crane forwards and tensioning the No. 3 stay cable again.
Further, after the erection of the No. 1 section steel box girder is completed, the storage device is disassembled.
Further, after the erection of the No. 1 section steel box girder is completed, the next section of standard section steel box girder is transported to be in place, and the construction is carried out according to the following sequence: the bridge deck lifting appliance is connected with the steel box girder; lifting; aligning; temporarily connecting; welding; installing a stay cable and tensioning for the first time; the beam crane is moved forward to be in position; tensioning the subsequent stay cable for the second time; repeating the construction steps until the erection of the steel box girder is completed.
The method for erecting the steel box girder has at least the following beneficial effects: the storage device is installed on the ground of the river side, the 1# section steel box girder is hoisted to the storage device together through the floating crane simultaneous section of the early hoisting reinforced concrete combination section, after the installation of the reinforced concrete combination section is completed, the 1# section steel box girder stored on the storage device is hoisted and erected through the girder erecting crane on the reinforced concrete combination section, so that the erection of the 1# section steel box girder is simple and quick; the storage device solves the problems that the construction period of erecting the 1# section steel box girder needs to build the underwater ultra-high support is long, the cost is high and the safety risk is high, and solves the problem that the flat top barge cannot be close to the cliff side slope and the land 1# section steel box girder is directly erected on the steel-concrete combined section by using the amplitude frame girder crane. In addition, after the floating crane lifts the 1# section steel box girder onto the storage device, the floating crane can be returned to the field in advance, so that the use cost of the floating crane is reduced, and the erection construction cost of the 1# section steel box girder is reduced.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The invention is further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic diagram of a 1# cast-in-place concrete girder construction in an embodiment of the present invention;
FIG. 2 is a schematic diagram of the construction of a 2# to 3# cast-in-place concrete girder in an embodiment of the present invention;
FIG. 3 is a schematic diagram of the erection of a steel-concrete joint section support in an embodiment of the invention;
FIG. 4 is an elevation view of a storage device in an embodiment of the invention;
FIG. 5 is a side view of a storage device in an embodiment of the invention;
FIG. 6 is a plan view of a storage device in an embodiment of the invention;
FIG. 7 is a schematic illustration of a fourth section of concrete and reinforced concrete joint section concrete placement in an embodiment of the invention;
fig. 8 is a schematic view of the lifting suspension assembly of a steel box girder of embodiment 1# of the present invention.
Reference numerals:
main tower 1, water surface line 2, riverbed line 3, bearing platform 44, ground low-level bracket 5, tower crane 11, floating crane 12, girder erection crane 13, cast-in-situ bracket 21, steel-concrete combination section bracket 22, longitudinal beam 31, cross beam 32, front pull rod 33, rear pull rod 34, pile top distribution beam 35,1 number stay cable 41,2 number stay cable 42, steel-concrete combination section 51,1# section steel box girder 52, cast-in-place concrete main girder 53 and anchoring device 60.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present invention and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a number is one or more, the meaning of a number is two or more, and greater than, less than, exceeding, etc. are understood to exclude the present number, and the meaning of a number is understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
In the description of the present invention, the descriptions of the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
For a 1# segment steel box girder 52 in a reinforced concrete combined bridge crossing a river, the traditional construction process is as follows: firstly, inserting or constructing a high-altitude bracket, hoisting the steel-concrete combined section 51 and the 1# section steel box girder 52 to the high-altitude large bracket by using the in-water floating crane 12, constructing a concrete section between the steel girder of the steel-concrete combined section 51 and the constructed concrete box girder, and then accurately aligning the 1# section steel box girder 52 and the steel-concrete combined section 51 to finish full-section welding. The 1# section steel box girder 52 is transported to a construction position in water by using a flat-plate barge, a walking type girder erection crane is assembled on the reinforced concrete combination section 51 by using the main tower 1 tower crane 11, then the 1# section steel box girder 52 is hoisted by using the walking type girder erection crane, and full-section welding is performed after the 1# section steel box girder 52 and the reinforced concrete combination section 51 are accurately aligned.
When the installation position of the 1# section steel box girder 52 is located above the cliff side slope, the flat top barge cannot be close to the construction position of the 1# section steel box girder 52, the 1# section steel box girder 52 cannot be transported to be in place by adopting the barge, the steel box girder section can be directly erected in an amplitude variation way through a girder erection crane, and only the high-altitude support can be installed at the installation position of the 1# section steel box girder 52 and then erected by using the floating crane 12.
Aiming at the river side topography that the installation position of the No. 1 segment steel box girder 52 is positioned above the cliff side slope, the embodiment of the invention provides a steel box girder erection method, which comprises the following steps:
performing construction of a cast-in-place concrete main beam 53;
setting up a steel-concrete combined section bracket 22 in the midspan direction below the design position of the steel-concrete combined section 51;
a storage device is arranged below the design position of the 1# standard steel box girder and is used for storing the 1# section steel box girder 52;
hoisting the reinforced concrete joint section 51 to the reinforced concrete joint section support 22 by using the floating crane 12, and then hoisting the 1# section steel box girder 52 to the storage device by using the floating crane 12;
hoisting the 1# section steel box girder 52 into position by using a girder erection crane 13 and installing;
and (5) erecting the rest standard section steel box girders until the steel box girders are erected.
Through the ground construction ground low-level bracket 5 at the river side, then install strorage device, hang 1# section steel box girder 52 through the floating crane 12 of earlier stage hoist and mount steel and concrete combination section and deposit on strorage device, after installing steel and concrete combination section 51, directly hang the construction of hanging 1# section steel box girder 52 of depositing on strorage device through the frame roof beam loop-crane 13 on the steel and concrete combination section 51, the construction of hanging 1# section steel box girder 52 through the floating crane 12 after having solved the flat-top barge and can't be close to cliff side slope and needing to install the high altitude support, the condition of needing to set up the aquatic super high support when having avoided setting up 1# section steel box girder 52, construction cycle has been shortened, construction risk has been reduced. In addition, the floating crane 12 lifts the 1# section steel box girder 52 and the reinforced concrete combined section 51 to the storage device for storage at the same time, and then the floating crane can be moved out of the field in advance, so that the use cost of the floating crane 12 is reduced, and the erection construction cost of constructing the 1# section steel box girder 52 is reduced.
Referring to fig. 1 to 2, the cast-in-place concrete girder 53 construction includes:
(1) Drilling construction of piers and bridge towers, construction of bearing platforms 4, and construction of pier bodies and tower columns;
(2) Inserting and punching a steel pipe pile foundation of a cast-in-situ section of the side span section concrete girder, erecting a Bailey girder bracket, and prepressing according to the dead weight of the concrete girder by 1.2 times;
(3) Binding 53 sections of common steel bars of a cast-in-place concrete girder, laying a prestressed pipeline, pouring girder concrete, arranging a temporary fixed hinged support on the top of a transition pier, and tensioning the section of prestressed beam after the strength of the concrete reaches the requirement;
(4) Continuously pouring concrete of the tower column;
(5) Repeating the construction steps of the segmented concrete girder, sequentially completing 53-section construction of the 2# to 3# cast-in-place concrete girder,
and then the construction of the reinforced concrete joint section 51 is performed.
In construction of the reinforced concrete joint section 51, the reinforced concrete joint section support 22 is installed in such a manner that the inclined legs are combined with the cantilever stringers to enhance the crossing ability of the reinforced concrete joint section support 22, as shown in fig. 3. The ground low-level bracket 5 is pre-constructed below the reinforced concrete joint section bracket 22 and is used for supporting the reinforced concrete joint section bracket 22. The steel-concrete combined section support 22 is installed in a mode of combining the inclined support legs with the cantilever longitudinal beams, so that the engineering quantity of the foundation of the steel-concrete combined section support 22 is reduced, and meanwhile, the space required for installing the steel-concrete combined section support 22 is reduced, so that the situation that the ground space on the cliff side slope on the river side is insufficient is adapted. Wherein, the support 22 of the steel-concrete combination section 51 is provided with an adjusting device for adjusting the steel-concrete combination section 51 to a design position.
A storage device is installed below the installation position of the 1# segment steel box girder 52 as a storage platform for the 1# segment steel box girder 52. After the construction of the storage device is completed, the steel-concrete combined section 51 and the 1# section steel box girder 52 are transported to the site through a girder transporting ship, the steel-concrete combined section 51 is hoisted to the steel-concrete combined section support 22 by utilizing the floating crane 12, and the steel-concrete combined section 51 is adjusted to a design position through an adjusting device. The 1# section steel box girder 52 is then hoisted to the storage device by the floating crane 12, and the rear floating crane 12 can be returned in advance, so that the use cost of the floating crane 12 is reduced, and the construction cost is reduced.
Referring to fig. 4 to 6, the storage device includes a cross beam 32, a longitudinal beam 31, a front pull rod 33 and a rear pull rod 34 of a pile top distribution beam 35, one end of the longitudinal beam 31 is fixed on a bearing platform 4 through an anchoring device 60, the other end of the longitudinal beam 31 is arranged in a cantilever manner along the midspan direction, a plurality of cross beams 32 are erected at the cantilever ends of the longitudinal beam 31, the pile top distribution beam 35 is vertically installed on a ground low-level bracket 5, one end of the front pull rod 33 is connected with the cantilever ends of the longitudinal beam 31, the other end of the front pull rod 33 is connected with the top end of the pile top distribution beam 35, one end of the rear pull rod 34 is connected with the top end of the pile top distribution beam 35, and the other end of the rear pull rod 34 is connected with the longitudinal beam 31 at one end of the bearing platform 4. Through setting up strorage device in order to deposit 1# section steel box girder 52 on main tower 1 cushion cap 4 and the bottom surface support cushion cap 4 of one side, then utilize frame roof beam loop wheel machine 13 hoist 1# section steel box girder 52 on the bridge floor, avoided the condition that needs to set up the high altitude support, also made floating crane 12 can be moved out of the way in advance and then reduced the expense simultaneously.
In the above embodiment, after the steel box girder 52 of the segment # 1 is lifted to the storage device to be stored, the reinforced concrete combination section 51 is adjusted to the design position, the fourth concrete girder and the reinforced concrete combination section are poured to combine the girder concrete and stretch-draw the longitudinal prestressed steel bundles, and after the concrete strength reaches the requirement, the stay cables # 1 41 and # 2 are installed, as shown in fig. 7.
Before hoisting the 1# section steel box girder 52, assembling the frame girder crane 13 on the steel-concrete combined section 51 by using the main tower crane 11, carrying out a load test on the frame girder crane, and hoisting the 1# section steel box girder 52 after the load test is qualified.
It should be noted that the girder erection crane 13 is a luffing girder erection crane 13, and the luffing girder erection crane 13 can make the 1# section steel box girder 52 move in a straight line in a horizontal direction or a vertical direction.
Referring to fig. 8, the suspension construction sequence of the 1# segment steel box girder 52 includes: the lifting appliance of the amplitude frame girder crane 13 is connected with a No. 1 section steel box girder 52; lifting the 1# section steel box girder 52; the amplitude of the amplitude-variable girder erection crane 13 is increased horizontally; lifting the 1# section steel box girder 52 again; the amplitude of the amplitude-variable girder erection crane 13 is reduced horizontally; accurately aligning the 1# segment steel box girder 52 with the reinforced concrete joint section 51; temporarily connecting the 1# segment steel box girder 52; fixedly connecting a 1# section steel box girder 52 with the reinforced concrete combination section 51; installing a No. 3 stay cable on the No. 1 section steel box girder 52 and tensioning for the first time; the amplitude-variable girder crane 13 is moved forward, and the No. 3 stay cable is tensioned again. The amplitude of the amplitude-variable frame girder crane 13 is increased and reduced in the horizontal direction, so that the 1# section steel box girder 52 avoids the steel-concrete combined section support, and the 1# section steel box girder 52 is prevented from colliding with the steel-concrete combined section support in the lifting process.
After the erection of the 1# section steel box girder 52 is completed, the storage device is removed.
After the erection of the 1# section steel box girder 52 is completed, the next section of standard section steel box girder is transported to be in place, and the construction is repeated according to the sequence of connecting the bridge deck girder crane 13 with the steel box girder, lifting, accurate alignment of the steel box girder, temporary connection of the steel box girder, welding of the steel box girder, installation of the subsequent stay cable, primary tensioning, forward moving of the girder crane to be in place and secondary tensioning of the subsequent stay cable until the erection of the steel box girder is completed.
It should be noted that "1#" in the "1# standard section steel box girder" only indicates the numbering sequence of the steel box girder, and is only used for distinguishing different sections of the steel box girder; the "number 1" in the "number 1 stay" indicates the number sequence of stay cables, and is only used for distinguishing stay cables at different positions.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present invention. Furthermore, embodiments of the invention and features of the embodiments may be combined with each other without conflict.

Claims (3)

1. A method of erecting a steel box girder, comprising:
performing cast-in-place concrete girder construction;
setting up a steel-concrete combined section bracket in the midspan direction below the design position of the steel-concrete combined section;
a storage device is arranged below the design position of the 1# section steel box girder and used for storing the 1# section steel box girder;
hoisting the reinforced concrete combined section to a reinforced concrete combined section support by using a floating crane, and hoisting the 1# section steel box girder to the storage device by using the floating crane;
hoisting the 1# section steel box girder into position by using a girder erection crane and installing;
erecting the rest segment steel box girders until the steel box girders are erected;
the storage device comprises a cross beam, a longitudinal beam, a pile top distribution beam, a front pull rod and a rear pull rod, wherein one end of the longitudinal beam is fixed on a bearing platform through an anchoring device, the other end of the longitudinal beam is arranged in a cantilever manner along the midspan direction, a plurality of cross beams are erected at the cantilever ends of the longitudinal beam, the pile top distribution beam is vertically arranged on a ground low-level support, one end of the front pull rod is connected with the cantilever ends of the longitudinal beam, the other end of the front pull rod is connected with the top end of the pile top distribution beam, one end of the rear pull rod is connected with the top end of the pile top distribution beam, and the other end of the rear pull rod is connected with one end of the bearing platform; the suspension construction sequence of the No. 1 segment steel box girder comprises the following steps: lifting the 1# section steel box girder, horizontally increasing the amplitude of the amplitude-variable frame girder crane, lifting the 1# section steel box girder again, horizontally reducing the amplitude of the amplitude-variable frame girder crane, and fixedly connecting the 1# section steel box girder with the reinforced concrete combination section; the steel-concrete combined section support is installed in a mode of combining an inclined supporting leg with a cantilever longitudinal beam so as to improve the crossing capacity of the steel-concrete combined section support; after the steel-concrete combined section is adjusted to a designed position, pouring concrete of a fourth section concrete beam and the steel-concrete combined section combined beam, tensioning a longitudinal prestress steel beam, and installing a No. 1 stay cable and a No. 2 stay cable after the strength of the concrete meets the requirement; before hoisting the 1# section steel box girder, assembling a girder crane on the steel-concrete combination section by using a main tower crane, carrying out a load test on the girder crane, and hoisting the 1# section steel box girder after the load test is qualified; after the 1# section steel box girder is fixedly connected with the steel-concrete combination section, a 3# stay cable is arranged on the 1# section steel box girder and is tensioned for the first time; and (5) moving the girder crane forwards and tensioning the No. 3 stay cable again.
2. The method of erecting a steel box girder according to claim 1, wherein the storage device is removed after the erection of the 1# segment steel box girder is completed.
3. The method for erecting a steel box girder according to claim 1, wherein after the erection of the 1# section steel box girder is completed, the next section of standard section steel box girder is transported to be in place, and is constructed in the following order: the bridge deck lifting appliance is connected with the steel box girder; lifting; aligning; temporarily connecting; welding; installing a stay cable and tensioning for the first time; the beam crane is moved forward to be in position; tensioning the subsequent stay cable for the second time; repeating the construction steps until the erection of the steel box girder is completed.
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