CN113802464A - Segment box girder construction system and construction method thereof - Google Patents

Abstract

The invention discloses a construction system and a construction method of a segment box girder, wherein the construction system comprises the segment box girder and a crane, the segment box girder comprises a top plate, a bottom plate and side plates, the side surface of the top plate far away from the bottom plate is also provided with a first guide rail, the side surface of the bottom plate far away from the top plate is provided with a second guide rail, when the plurality of segment box girders are spliced, the plurality of first guide rails are connected with each other, and the plurality of second guide rails are connected with each other and extend along the extension direction of the segment box girder; the crane comprises an upper crane and a lower crane; the upper crane is matched with the first guide rail, so that the upper crane moves in the direction of the surface where the top plates are connected; lower loop wheel machine and second guide rail are mutually supported to the face direction that the loop wheel machine place when a plurality of bottom plates are connected moves down in the realization, when carrying out the overpass construction, under the prerequisite of guaranteeing stability, realizes treating the safe transportation of assembling the module, when guaranteeing the efficiency of construction, guarantees construction safety.

Description

Segment box girder construction system and construction method thereof

Technical Field

The invention relates to the technical field of bridge construction, in particular to a construction system and a construction method of a segmental box girder.

Background

At present, the construction of the traffic infrastructure of China is rapidly developed, more and more high-speed railways need to be constructed, and the high-speed railways need to meet the requirements of stability, no vibration, no shaking and safety under the condition of high-speed operation, so in the prior art, the high-speed railways are usually constructed in a viaduct mode.

Aiming at the construction mode of the viaduct, the construction of the viaduct is usually realized by adopting a tower crane or a bridge crane in the conventional construction mode, a larger construction range is required by adopting the tower crane, the transportation of the modules to be assembled can be carried out on the constructed wall surface or the ground by adopting the bridge crane, the construction efficiency is lower, and certain potential safety hazards exist due to the fact that the modules to be assembled are large in scale.

In view of this, the present application is specifically made.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a segment box girder construction system, which realizes the safe transportation of modules to be assembled on the premise of ensuring the stability when a viaduct is constructed through the structural design of the construction system, and ensures the construction safety of buildings while ensuring the construction efficiency; in a second aspect, the invention further provides a segment box girder construction method, and the construction method can be used for achieving the purpose of improving the construction efficiency of the viaduct.

First aspect

The embodiment of the invention provides a segment box girder construction system which comprises a segment box girder and a crane, wherein the segment box girder comprises a top plate, a bottom plate and two side plates, two ends of each side edge are respectively connected with the top plate and the bottom plate, a first guide rail is further arranged on the side surface of the top plate far away from the bottom plate, and when the segment box girders are spliced, the first guide rails are mutually connected and extend along the extension direction of the segment box girder; the side surface of the bottom plate, which is far away from the top plate, is also provided with a second guide rail, and when the plurality of section box girders are spliced, the plurality of second guide rails are connected with each other and extend along the extension direction of the section box girders; the crane comprises an upper crane and a lower crane; the upper crane is matched with the first guide rail, so that the upper crane moves in the direction of the surface where the top plates are connected; the lower crane is matched with the second guide rail, so that the lower crane moves in the direction of the surface where the bottom plates are connected.

In the scheme, the construction system comprises the segment box girders and the cranes, wherein the cranes comprise upper cranes and lower cranes, and the upper and lower surfaces of the segment box girders are provided with the first guide rails and the second guide rails which are respectively matched with the upper cranes and the lower cranes, so that the upper cranes and the lower cranes can move on the upper and lower surfaces of the spliced segment box girders, compared with the prior art, the construction system designed by the scheme has the advantages that the hoisting structure is arranged in the range of a bridge floor through the structural design, the engineering floor area is effectively reduced, the damage of the engineering construction to the surrounding ecological environment is effectively reduced, the influence of the engineering construction on the surrounding environment is reduced, on the other hand, the existing mode of realizing the segment box girders in place in the horizontal direction through the arrangement of the upper and lower cranes is changed, the ground carrying process is effectively omitted, economic cost brought by using the ground carrying vehicle is avoided, and better economic benefit is achieved.

Further, the upper crane comprises a first supporting base and second supporting bases arranged at two sides of the first supporting base, the second supporting base is used for being matched with the first guide rail to realize that the upper crane moves in the direction of the surface where the top plates are connected, and the position arrangement of the first supporting base and the second supporting base is realized, can effectively ensure the stability of the upper crane, can realize the movement and ensure the stability at the same time, and the construction range can be effectively enlarged and the construction efficiency can be improved by the movement of the upper crane, and by the relative position design of the first supporting base and the second supporting base, in the moving process of the upper crane, the two ends are supported, so that the stability of the upper crane is further ensured, the middle support is avoided, and the influence of the first support base structure on the stability of the upper crane is avoided.

Furthermore, the top plate comprises a top plate body and side wing portions arranged on two sides of the top plate body, one end of each side wing portion is connected with the top plate body, the side wing portions are used for achieving the effect that when the multiple segmental box girders are connected, the plane formed by the top plate is enlarged in the direction perpendicular to the extension direction of the segmental box girders, and the bridge deck range can be enlarged through the side wing portions, so that the number of running lanes or rails is increased in a targeted mode.

Furthermore, the section box girder further comprises a supporting piece, one end of the supporting piece is connected with the side face, close to the bottom plate, of the side wing portion, the other end of the supporting piece is connected with the side plate, and through the structural design of the supporting piece, the stability of the side wing portion can be effectively guaranteed.

Furthermore, the first guide rail is arranged on the side face, far away from the bottom plate, of the side wing part, when the crane is matched with the section box girder, the projection of the first support base in the plane where the top plate body is located is within the range of the top plate body, the first guide rail is arranged on the side wing part through the position design of the first guide rail, the distance between the first guide rail is effectively enlarged, the force sharing of the upper crane in the moving process can be realized, and the stability of the upper crane can be further ensured through the position design of the first support base.

Furthermore, when the crane is matched with the section box girder, the projection of the first supporting base in the plane of the top plate body is within the area range of the two side plates, and the stability of the upper crane can be further ensured through the position design of the first supporting base.

Furthermore, the upper crane further comprises an extension guide rail, the projection of at least one of the two ends of the extension guide rail on the plane where the first support base is located falls outside the range of the first support base, and the upper crane can conveniently receive the segment box girder on the lower crane through the structural design of the extension guide rail when the upper crane is used.

Furthermore, the extension guide rail also comprises a first hanging head which can slide in the direction of the extension guide rail, and the lower crane also comprises a second hanging head; the loop wheel machine still includes the triangle and hangs the piece, the position of the three angle of triangle hanging piece all sets up the fitting piece, the fitting piece is used for hanging head or second and hangs head or festival section case roof beam and mutually support, realizes the hoist and mount of festival section case roof beam, through the structural design of triangle hanging piece, when carrying out festival section case roof beam and hang and get, one of two angles of triangle hanging foot hangs the head with first hanging head or second and is connected, and another angle is used for being connected with festival section case roof beam, realizes hanging and gets, and because the effect of gravity, the hypotenuse in the middle of two fitting pieces in use should be perpendicular with the horizontal plane, and another is located one side of this hypotenuse, and has certain interval, makes things convenient for another hanging head to transfer to the realization is shifted.

Further, the triangle hangs the piece and is equilateral triangle, through adopting equilateral triangle's structural design, when using, but the hoist and mount in-process each time, the position that corresponds is the same, need not adjust the position of hanging the head, provides the efficiency of construction.

Second aspect of the invention

The embodiment of the invention also provides a construction method of the segmental box girder, which is based on the segmental box girder construction system and comprises the following steps:

s1, building a pier, building an initial segment box girder, and building a crane at the end part of the segment box girder;

s2, taking the segment box girder to be assembled through the lower crane and transporting the segment box girder to a position to be installed in the horizontal direction on the second guide rail;

s3, after the section box girder to be assembled is transported to the position to be installed in the horizontal direction and is stable, the section box girder in place is hoisted by the upper crane and continuously ascends to the position to be installed in the vertical direction, and the splicing of the section box girder is realized;

s4: and repeating the steps S2-S3 to complete the construction of the bridge deck.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the construction system and the construction method of the segmental box girder, the hoisting structure is arranged in the range of the bridge floor through structural design, so that the engineering floor area is effectively reduced, the damage of engineering construction to the surrounding ecological environment can be effectively reduced, and the influence of the development of the engineering construction on the surrounding environment is reduced;

2. according to the construction system and the construction method of the segmental box girder, the stability of the upper crane can be effectively ensured through the position arrangement of the first support base and the second support base, the stability can be ensured while the movement is realized, the construction range can be effectively expanded through the movement of the upper crane, the construction efficiency is improved, and the stability of the upper crane is further ensured through the support at the two ends in the movement process of the upper crane through the relative position design of the first support base and the second support base, so that the influence of the structure of the first support base on the stability of the upper crane in the middle support is avoided;

3. according to the construction system and the construction method of the segmental box girder, the structural design of the flank part can expand the range of the bridge deck, so that the number of lanes or rails is increased in a targeted manner;

4. according to the construction system and the construction method of the segmental box girder, through the structural design of the triangular hanging piece, when the segmental box girder is hung, one of two corners of the triangular hanging foot is connected with the first hanging head or the second hanging head, the other corner is used for being connected with the segmental box girder, so that the hanging is realized, and due to the action of gravity, the inclined edge between the two matching pieces in use is vertical to the horizontal plane, the other corner is positioned on one side of the inclined edge, and a certain distance exists between the inclined edge and the other corner, so that the other hanging head can be conveniently taken, and the transfer is realized;

5. according to the construction system and the construction method of the segmental box girder, which are designed by the invention, the aim of improving the construction efficiency of the viaduct can be fulfilled by implementing the construction method.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.

FIG. 1 is a schematic structural diagram of a segmental box girder according to an embodiment of the invention;

FIG. 2 is a top view of a top plate provided by an embodiment of the present invention;

FIG. 3 is a bottom view of a segmented box girder provided in accordance with an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a segmental box girder construction system provided by an embodiment of the invention;

fig. 5 is a side view of a sectional box girder construction system according to an embodiment of the present invention.

The reference numbers in the figures are in order:

100-segment box girder, 110-top plate, 111-first guide rail, 112-top plate body, 113-flank part, 120-bottom plate, 121-second guide rail, 130-side plate, 140-supporting piece, 210-upper crane, 211-first supporting base, 212-second supporting base, 213-extension guide rail, 213 a-first crane head, 220-lower crane, 221-second crane head, 230-triangular crane piece.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.

Examples

As shown in fig. 1, an embodiment of the present invention provides a segment box girder construction system, including a segment box girder 100 and a crane, where the segment box girder 100 includes a top plate 110, a bottom plate 120 and two side plates 130, two ends of each side edge are respectively connected to the top plate 110 and the bottom plate 120, a side surface of the top plate 110 away from the bottom plate 120 is further provided with a first guide rail 111, and when a plurality of segment box girders 100 are spliced, the plurality of first guide rails 111 are connected to each other and extend along an extending direction of the segment box girder 100; the side of the bottom plate 120 away from the top plate 110 is further provided with a second guide rail 121, and when a plurality of the section box girders 100 are spliced, the plurality of second guide rails 121 are connected with each other and extend along the extending direction of the section box girders 100; the cranes include an upper crane 210 and a lower crane 220; the upper crane 210 is engaged with the first guide rail 111, thereby enabling the upper crane 210 to move in the direction of the plane in which the plurality of top plates 110 are coupled; the lower crane 220 is engaged with the second guide rail 121, thereby realizing the movement of the lower crane 220 in the direction of the plane where the plurality of base plates 120 are coupled.

It should be noted that, in the process of splicing the section box girders 100, one end of one section box girder 100 and one end of another section box girder 100 are spliced with each other to extend the section box girder 100, and both the upper crane 210 and the lower crane 220 are used to lift the section box girder 100, so the extending direction of the first guide rail 111 and the second guide rail 121 should be the same as the extending direction of the section box girder 100 when being connected.

In this scheme, the construction system includes the segment box girder 100, the crane includes the upper crane 210 and the lower crane 220, through set up respectively with the upper crane 210 and the first guide rail 111 and the second guide rail 121 of the mutual complex of lower crane 220 on the upper and lower surface of the segment box girder 100, realize the motion of the upper crane 210 and the lower crane 220 on the upper and lower surface after a plurality of segment box girders 100 accomplish the concatenation, compared with the prior art, the construction system that this scheme designed, through structural design, set up the hoisting structure in the scope of bridge floor, the effective engineering area that reduces, can effectively reduce the destruction of engineering construction to peripheral ecological environment, reduce and develop the influence of engineering construction to peripheral environment, on the other hand, through setting up the upper crane 220, change the present mode through the ground carrier and realize that the segment box girder 100 targets in place in the horizontal direction, the ground carrying process is effectively omitted, economic cost brought by using the ground carrying vehicle is avoided, and better economic benefit is achieved.

As shown in fig. 4, in some embodiments, the upper crane 210 includes a first supporting base 211 and second supporting bases 212 disposed at two sides of the first supporting base 211, and the second supporting bases 212 are configured to cooperate with the first guide rail 111 to enable the upper crane 210 to move in a direction of a plane where the top plates 110 are connected, and the stability of the upper crane 210 can be effectively ensured by the position arrangement of the first supporting base 211 and the second supporting base 212, and the stability can be ensured while moving, and by the movement of the upper crane 210, the construction range can be effectively expanded to provide construction efficiency, and by the relative position design of the first supporting base 211 and the second supporting base 212, in the moving process of the upper crane 210, the stability of the upper crane 210 is further ensured by supporting two ends, avoiding the influence of the structure of the first support base 211 on the stability of the upper crane 210 in the middle support.

As will be known to those skilled in the art, the upper crane 210 and the lower crane 220 are both disposed on the assembled section box girder 100, so that in order to reduce the self weight of the upper crane 210 and the lower crane 220 to affect the assembled section box girder 100, the main structures of the upper crane 210 and the lower crane 220 are frame structures, and the self weight is reduced.

Specifically, as a person skilled in the art will know, the main function of the first supporting base 211 is to realize the support of the first crane 210, and the main purpose of the second supporting base 212 is that the second sliding rails are matched with each other for realizing the movement of the first crane 210, based on which, the second supporting base 212 may have a lifting member, when the second crane 210 needs to be moved, the lifting member may be lifted, the second supporting base 212 temporarily supports the first crane 210, the second crane 210 moves to a subsequent position to generate a lifting member, the lifting member is lowered to put down the first supporting base 211, and the first supporting base 211 realizes the support of the first crane 210.

It should be noted that the first supporting base 211 and the second supporting base 212 both have the supporting function of the upper crane 210, and the difference is that the time and the force that the first supporting base 211 is used for supporting are both greater than those of the second supporting base 212, but the structural strength of both should meet the supporting requirement.

As shown in fig. 2, in some embodiments, the top plate 110 includes a top plate body 112 and wing portions 113 disposed on both sides of the top plate body 112, one end of each wing portion 113 is connected to the top plate body 112, the wing portions 113 are used for expanding a plane formed by the top plate 110 in a direction perpendicular to an extending direction of the segment box girders 100 when a plurality of the segment box girders 100 are connected, and the wing portions 113 can expand a bridge deck area, thereby increasing the number of lanes or rails in a targeted manner.

The wing part 113 may be a steel plate or a rib, and may be grouted in a subsequent construction process in order to enlarge a running surface.

As shown in fig. 1 or 3, in some embodiments, the segment box girder 100 further includes a support 140, one end of the support 140 is connected to the side surface of the wing portion 113 close to the bottom plate 120, and the other end of the support 140 is connected to the side plate 130, and the structural design of the support 140 can effectively ensure the stability of the wing portion 113.

In some embodiments, the first guide rail 111 is disposed on a side surface of the side wing portion 113 away from the bottom plate 120, when the crane is engaged with the segment box girder 100, a projection of the first support base 211 in a plane where the top plate body 112 is located falls within a range of the top plate body 112, and the first guide rail 111 is disposed on the side wing portion 113 through a position design of the first guide rail 111, so that a distance between the first guide rails 111 is effectively enlarged, a force sharing of the upper crane 210 during a moving process can be achieved, and a stability of the upper crane 210 can be further ensured through the position design of the first support base 211.

In some embodiments, when the crane is engaged with the section box girder 100, the projection of the first supporting base 211 in the plane of the top plate body 112 falls within the area of the two side plates 130, and the stability of the upper crane 210 can be further ensured by the position design of the first supporting base 211.

As shown in fig. 4, in some embodiments, the upper crane 210 further includes an extension rail 213, a projection of at least one of two ends of the extension rail 213 onto a plane of the first support base 211 falls outside a range of the first support base 211, and the upper crane 210 is convenient to receive the segment box girder 100 of the lower crane 220 in use due to the structural design of the extension rail 213.

As will be appreciated by those skilled in the art, the movement ranges of the upper crane 210 and the lower crane 220 are limited by the extension ranges of the first guide rail 111 and the second guide rail 121, so that the extension of the first hanging head 213a can be effectively realized by the structural design of the extension guide rail 213, and the interference between the next segment of box girder 100 to be installed and the installed segment of box girder 100 during the hanging process can be effectively avoided, thereby affecting the normal operation of the engineering, so that the extension guide rail 213 can be parallel to the top plate 110 or inclined.

As shown in fig. 4-5, in some embodiments, the extension rail 213 further includes a first head 213a, the first head 213a being slidable in the direction of the extension rail 213, and the lower crane 220 further includes a second head 221; the crane further comprises a triangular hanging piece 230, the positions of three corners of the triangular hanging piece 230 are provided with matching pieces, the matching pieces are used for being matched with the first hanging head 213a or the second hanging head 221 or the section box beam 100 to realize the hanging of the section box beam 100, through the structural design of the triangular hanging piece 230, when the section box beam 100 is hung and taken, one of the two corners of the triangular hanging foot is connected with the first hanging head 213a or the second hanging head 221, the other corner is used for being connected with the section box beam 100 to realize the hanging and taking, due to the action of gravity, the bevel edge between the two matching pieces in use is vertical to the horizontal plane, the other bevel edge is located on one side of the bevel edge, and a certain distance exists, so that the other hanging head can be conveniently taken, and the transfer is realized.

Specifically, in various processes of lifting the segment box girder 100 by using the triangular lifting element 230, the lower crane 220 firstly lifts by using the triangular lifting element 230, and it should be noted that, in order to ensure that the first lifting head 213a can be connected with an unused member of the three mating members of the triangular lifting element 230, the initially used triangular lifting element 230 is connected with the second lifting head 221 in a manner that the unused mating member should be located on the side of the connecting rods of the two mating members in use, which is located at the downstream side in the moving direction; in the extreme position of the movement of the section box girder 100 to the second guide rail 121, the unused mating member protrudes relative to the end surface of the outer section box girder 100, so that the connection with the first hanging head 213a is realized, and in the connection process, because the first hanging head 213a is located at the side of the connecting rod of the two mating members in use, which is located at the downstream side in the movement direction, after the connection, the triangular hanging member 230 rotates in the direction close to the downstream side in the movement direction, so that the section box girder 100 moves a certain distance in the movement direction, and the occurrence of interference is further avoided.

As shown in fig. 5, in some embodiments, the triangular hanging member 230 is an equilateral triangle, and by adopting the structural design of the equilateral triangle, when in use, the corresponding position can be the same in each hanging process, and the position of the hanging head does not need to be adjusted, thereby providing construction efficiency.

The embodiment of the invention also provides a construction method of the segmental box girder 100, and the segmental box girder construction system based on the segmental box girder comprises the following steps:

s1, building a pier, building an initial segment box girder 100, and building a crane at the end part of the segment box girder 100;

s2, taking the section box girder 100 to be assembled by the lower crane 220 and transporting the section box girder to a position to be installed in the horizontal direction on the second guide rail 121;

s3, after the section box girder 100 to be assembled is transported to the position to be installed in the horizontal direction and is stable, the section box girder 100 to be assembled is hoisted by the upper crane 210 and continuously ascends to the position to be installed in the vertical direction, so that the splicing of the section box girder is realized;

s4: and repeating the steps S2-S3 to complete the construction of the bridge deck.

The above embodiments are preferred embodiments of the present invention, and those skilled in the art can make variations and modifications to the above embodiments, so that the present invention is not limited to the above embodiments, and any obvious improvements, substitutions or modifications based on the present invention by those skilled in the art are within the protection scope of the present invention.

Claims (10)

1. A construction system of a segment box girder comprises the segment box girder (100) and a crane, wherein the segment box girder (100) comprises a top plate (110), a bottom plate (120) and two side plates (130), two ends of each side plate (130) are respectively connected with the top plate (110) and the bottom plate (120), and the construction system is characterized in that,

the side surface of the top plate (110) far away from the bottom plate (120) is also provided with a first guide rail (111), and when a plurality of the section box girders (100) are spliced, the first guide rails (111) are connected with each other and extend along the extension direction of the section box girders (100);

the side surface of the bottom plate (120) far away from the top plate (110) is also provided with a second guide rail (121), and when a plurality of the section box girders (100) are spliced, the second guide rails (121) are connected with each other and extend along the extension direction of the section box girders (100);

the crane comprises an upper crane (210) and a lower crane (220);

the upper crane (210) and the first guide rail (111) are mutually matched, so that the upper crane (210) moves in the direction of a surface where a plurality of top plates (110) are connected;

the lower crane (220) and the second guide rail (121) cooperate with each other, thereby enabling the lower crane (220) to move in the direction of a plane on which the plurality of base plates (120) are connected.

2. A segment box girder construction system according to claim 1, wherein the upper crane (210) comprises a first support base (211) and second support bases (212) arranged at both sides of the first support base (211), the second support bases (212) being adapted to cooperate with the first guide rail (111) to enable the upper crane (210) to move in the direction of a plane in which the plurality of top plates (110) are connected.

3. The system for constructing the segmental box girders according to claim 2, wherein the top plate (110) comprises a top plate body (112) and side wing parts (113) provided at both sides of the top plate body (112), one ends of the side wing parts (113) are connected with the top plate body (112), and the side wing parts (113) are used for realizing the enlargement of the plane formed by the top plate (110) in the direction perpendicular to the extension direction of the segmental box girders (100) when a plurality of segmental box girders (100) are connected.

4. A sectional box girder construction system according to claim 3, wherein the sectional box girder (100) further comprises a support (140), one end of the support (140) is connected to the side of the wing part (113) adjacent to the bottom plate (120), and the other end of the support (140) is connected to the side plate (130).

5. A segment box girder construction system according to claim 3, wherein the first guide rail (111) is arranged at the side of the flank portion (113) remote from the bottom plate (120), and the projection of the first support base (211) in the plane of the top plate body (112) falls within the range of the top plate body (112) when the crane is mutually engaged with the segment box girder (100).

6. A section box girder construction system according to claim 5, characterised in that the projection of the first support base (211) in the plane of the top deck body (112) falls within the area of the two side panels when the crane is in cooperation with the section box girder (100).

7. The segment box girder construction system according to claim 2, wherein the upper crane (210) further comprises an extension rail (213), and a projection of at least one of both ends of the extension rail (213) onto a plane on which the first support base (211) is located falls outside the range of the first support base (211).

8. A segmental box girder construction system according to claim 7, characterised in that the extension rail (213) further comprises a first hoisting head (213a), the first hoisting head (213a) being slidable in the direction of the extension rail (213), the lower crane (220) further comprising a second hoisting head (221); the crane further comprises a triangular hoisting piece (230), wherein fitting pieces are arranged at the positions of three corners of the triangular hoisting piece (230), and are used for being matched with the first hoisting head (213a) or the second hoisting head (221) or the segmental box beam (100) to realize hoisting of the segmental box beam (100).

9. A segmental box girder construction system according to claim 8, wherein the triangular hanger (230) is an equilateral triangle.

10. A construction method of a sectional box girder, which is based on the construction system of any one of claims 1 to 9, comprising the steps of:

s1, building a pier, building an initial segment box girder, and building a crane at the end part of the segment box girder;

s2, taking the segment box girder to be assembled through the lower crane and transporting the segment box girder to a position to be installed in the horizontal direction on the second guide rail;

s3, after the section box girder to be assembled is transported to the position to be installed in the horizontal direction and is stable, the section box girder in place is hoisted by the upper crane and continuously ascends to the position to be installed in the vertical direction, and the splicing of the section box girder is realized;

s4: and repeating the steps S2-S3 to complete the construction of the bridge deck.

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