CN113152243A - Small-radius box girder bridge structure and construction method thereof - Google Patents

Abstract

The invention discloses a small-radius box girder bridge structure and a construction method thereof, relates to the technical field of bridges, and mainly aims to reduce the manufacturing difficulty and cost of a template and solve the problem of high lofting precision requirement during the construction of a prefabricated box girder. The main technical scheme of the invention is as follows: the structure comprises a middle beam, wherein at least two rows of connecting steel plate groups which are sequentially arranged from top to bottom are embedded in webs on two sides of the middle beam, and each row of connecting steel plate group comprises a plurality of connecting steel plates which are arranged at intervals; the web plate on one side of the edge beam adjacent to the middle beam is embedded with at least two rows of connecting steel plate groups which are sequentially arranged from top to bottom; the cross beams are positioned between two adjacent middle beams and between the middle beams and the edge beams and are respectively connected between two corresponding connecting steel plates, and the two vertically adjacent cross beams are positioned in the same section; and the support beams comprise at least two raking beams, and the at least two raking beams are obliquely connected between the two cross beams positioned in the same section and form a triangle with the cross beams.

Description

Small-radius box girder bridge structure and construction method thereof

Technical Field

The invention relates to the technical field of bridges, in particular to a small-radius box girder bridge structure and a construction method thereof.

Background

The small-radius box girder has wider application in highway bridges, particularly urban overpasses. At present, in order to increase the section rigidity of box girders and limit distortion stress, a diaphragm plate in a cast-in-place wet joint form is usually arranged between the box girders so as to ensure the transverse integrity of a bridge and improve the stress condition of a main girder.

However, for the small-radius box girder, the connection of the concrete diaphragm adopts a cast-in-place wet joint form, the lofting accuracy requirement is high during the construction of the prefabricated box girder, and the lofting deviation of the diaphragm can cause the welding or binding difficulty of the lapped reinforcing steel bars, thereby influencing the integral stress of the bridge. And the diaphragm plate needs to be prefabricated along with the box girder, and the position of each box girder diaphragm plate is different, so that the cross section of the box girder template needs to be changed continuously, and the difficulty of template manufacture is increased.

Disclosure of Invention

In view of the above, the embodiment of the invention provides a small-radius box girder bridge structure and a construction method thereof, and mainly aims to reduce the manufacturing difficulty and cost of a template and solve the problems of high lofting precision requirement and difficult steel bar connection during the construction of a prefabricated box girder.

In order to achieve the purpose, the invention mainly provides the following technical scheme:

in one aspect, an embodiment of the present invention provides a small-radius box girder bridge structure, including:

the connecting steel plate group comprises a plurality of middle beams which are arranged side by side, wherein at least two rows of connecting steel plate groups which are sequentially arranged from top to bottom are embedded in webs on two sides of each middle beam, and each row of connecting steel plate groups comprises a plurality of connecting steel plates which are arranged at intervals;

the edge beams are positioned on the side parts of the plurality of middle beams, and at least two rows of connecting steel plate groups which are sequentially arranged from top to bottom are embedded in a web plate on one side of the edge beam adjacent to the middle beams;

the cross beams are positioned between two adjacent middle beams and between the middle beams and the edge beams, are respectively connected between two corresponding connecting steel plates, and are positioned in the same section;

the supporting beams comprise at least two inclined supporting beams, and the inclined supporting beams are obliquely connected between the two cross beams in the same section and form a triangle with the cross beams.

Further, the connecting steel plate comprises a body and a connecting steel bar connected with one side surface of the body;

the connecting steel bars are connected with the framework steel bars of the middle beam or the side beam, and the surface of the other side of the body is exposed out of the web plate and connected with the cross beam.

Furthermore, the connecting steel bar is in a shape of a Chinese character 'ji', and the connecting steel bar comprises a connecting arm and two support arms respectively connected to two ends of the connecting arm;

the connecting arm is connected with the body, and the supporting arm is connected with the framework steel bar.

Further, the connecting steel bars are deformed steel bars.

Further, the inclined angle of the raker beam relative to the cross beam is 30-60 degrees.

Furthermore, the surfaces of the connecting steel plate, the cross beam and the diagonal bracing beam are sequentially provided with an epoxy resin mortar layer and an anti-rust paint layer from inside to outside.

Further, the cross beam is made of profile steel; the inclined supporting beam is a channel steel.

On the other hand, the embodiment of the invention also provides a construction method of the small-radius box girder bridge structure, which is applied to the small-radius box girder bridge structure and comprises the following steps:

arranging framework steel bars of the prefabricated box girder;

manufacturing connecting steel plates, and respectively connecting the connecting steel plates with web plate reinforcing steel bars of the framework reinforcing steel bars;

pouring concrete of the prefabricated box girder, and sequentially erecting a middle girder and an edge girder of the prefabricated box girder according to a preset sequence; the connecting surface of the connecting steel plate is exposed out of the webs of the middle beam and the side beam;

connecting a plurality of cross beams between the webs of two adjacent center girders and between two corresponding connecting steel plates between the edge beam and the web of the center girder adjacent to the edge beam;

and respectively connecting a plurality of support beams between the webs of two adjacent center girders and between each two vertically adjacent cross beams in the same section between the edge beam and the web of the center girder adjacent to the edge beam.

Further, after connecting a plurality of support beams respectively between the webs of two adjacent center sills and between two cross beams respectively adjacent up and down and located in the same section between the edge beam and the web of the center sill adjacent thereto, the method further includes:

and carrying out sealing, waterproof and anticorrosive treatment on the connecting steel plate, the cross beam and the supporting beam.

Further, the step of carrying out sealed waterproof anticorrosion treatment on the connecting steel plate, the cross beam and the supporting beam specifically comprises the following steps:

removing oil stains and iron rust on the surfaces of the connecting steel plate, the cross beam and the supporting beam;

coating epoxy resin mortar layers on the surfaces of the connecting steel plate, the cross beam and the supporting beam after removing oil stains and iron rust;

and coating antirust paint on the surface of the epoxy resin mortar layer.

By means of the technical scheme, the invention at least has the following beneficial effects:

according to the technical scheme provided by the embodiment of the invention, the connecting steel plates are pre-buried on the webs on two sides of the middle beam and the web on one side of the edge beam, the transverse connection between the middle beam and the edge beam is ensured through the cross beams, meanwhile, the supporting beam is connected between the two cross beams in the same section, the connecting stability between the middle beam and the edge beam is improved through the supporting beam, so that the overall performance of the box beam is improved, in addition, the supporting beam comprises at least two inclined bracing beams, and the at least two inclined bracing beams and the cross beams form a triangle in a surrounding manner, so that the connecting stability between the middle beam and the edge beam is further improved, and the overall performance of the box beam is further improved. Compared with the prior art, the technical scheme provided by the embodiment of the invention adopts the cross beam and the supporting beam to replace a concrete diaphragm plate which needs to be prefabricated synchronously with the box girder, so that the section of the template does not need to be continuously adjusted when the box girder is prefabricated, and the difficulty and the cost of manufacturing the template are reduced; and because the connecting steel plates pre-buried on the middle beam and the boundary beam web are of plate-shaped structures, the connecting steel plates have connecting surfaces with certain areas, so that the cross beam can be connected at the central position of the connecting steel plates and also can be connected at the position deviated from the center when the cross beam is connected, and the problems of high lofting precision requirement and difficult steel bar connection during the construction of the prefabricated box beam are solved.

Drawings

Fig. 1 is a schematic structural diagram of a small-radius box girder bridge structure according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of a small-radius box girder bridge structure according to an embodiment of the present invention;

FIG. 3 is a schematic view of the interconnection of the center sill and the center sill or edge sill of FIG. 2;

fig. 4 is a schematic structural view of a connecting steel plate in a small-radius box girder bridge structure according to an embodiment of the present invention;

fig. 5 is a flowchart of a construction method of a small-radius box girder bridge structure according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the preferred embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

In the description of the present embodiment, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore, should not be construed as limiting the scope of the present embodiment.

As shown in fig. 1, 2 and 3, an embodiment of the present invention provides a small-radius box girder bridge structure, which includes a plurality of middle girders 1 arranged side by side, at least two rows of connecting steel plate sets arranged in sequence from top to bottom are embedded in webs on both sides of each middle girder 1, each row of connecting steel plate set includes a plurality of connecting steel plates 2 arranged at intervals, that is, the plurality of connecting steel plates 2 are arranged at intervals along the length direction of the middle girder 1; the edge beam 3 is positioned on the side parts of the plurality of middle beams 1, and at least two rows of connecting steel plate groups which are sequentially arranged from top to bottom are embedded in a web plate on one side of the edge beam 3 adjacent to the middle beams 1; the cross beams 4 are positioned between two adjacent middle beams 1 and between the middle beams 1 and the edge beams 3, and are respectively connected between two corresponding connecting steel plates 2, and the two cross beams 4 which are adjacent up and down are positioned in the same section; a plurality of supporting beams 5, wherein each supporting beam 5 comprises at least two raker beams 51, and the at least two raker beams 51 are obliquely connected between two cross beams 4 in the same section and form a triangle with the cross beams 4.

In the embodiment of the invention, the cross beams 4 and the support beams 5 can be steel beams which are connected between the adjacent middle beams 1 and between the middle beams 1 and the side beams 3 to form steel diaphragm plates, and the steel diaphragm plates replace concrete diaphragm plates.

The small-radius box girder bridge structure provided by the embodiment of the invention is characterized in that the connecting steel plates 2 are embedded in the webs at the two sides of the middle girder 1 and the web at one side of the edge girder 3, and between the opposite connecting steel plates 2 of the two adjacent middle girders 1, and a cross beam 4 is connected between the edge beam 3 and the opposite connecting steel plate 2 of the center beam 1, the cross beam 4 ensures the transverse connection between the center beam 1 and the edge beam 3, and at the same time, a support beam 5 is connected between the two cross beams 4 in the same section, the connection stability between the middle beam 1 and the edge beam 3 is improved through the support beam 5, thereby improving the overall performance of the box girder, and, the support beam 5 includes at least two raker beams 51, the at least two raker beams 51 and the cross beam 4 form a triangle, so that the connection stability between the middle beam 1 and the side beam 3 is further improved, and the overall performance of the box beam is further improved. Compared with the prior art, the technical scheme provided by the embodiment of the invention adopts the cross beam 4 and the support beam 5 to replace a concrete diaphragm plate which needs to be prefabricated synchronously with the box girder, so that the section of the template does not need to be continuously adjusted when the box girder is prefabricated, and the difficulty and the cost of manufacturing the template are reduced; moreover, because the connecting steel plates 2 pre-buried on the webs of the middle beam 1 and the edge beam 3 are of plate-shaped structures, the connecting steel plates 2 have connecting surfaces with certain areas, and the cross beam 4 can be connected to the central position of the connecting steel plates 2 and also can be connected to the position deviated from the center when the cross beam 4 is connected, so that the problems of high lofting precision requirement and difficult steel bar connection during the construction of the prefabricated box beam are solved.

In an alternative embodiment, referring to fig. 2, 3 and 4, the connection steel plate 2 may include a body 21 and a connection steel bar 22 connected to a side surface of the body 21, and the body 21 and the connection steel bar 22 are embedded in the center sill 1 or the side sill 3; the connecting steel bars 22 are connected with the framework steel bars of the middle beam 1 or the edge beam 3, and the other side surface of the body 21 is exposed out of the web plate and connected with the cross beam 4.

In the above embodiment, the connection steel plate 2 is welded to the framework steel bars of the middle beam 1 or the boundary beam 3 through the connection steel bars 22, and the surface deviating from the connection steel bars 22 on the body 21 of the connecting piece is exposed outside the web plate when concrete is poured, so that the cross beam 4 is welded to the surface exposed outside, thereby realizing the pre-embedded arrangement of the connection steel plate 2 in the middle beam 1 or the boundary beam 3, and ensuring the connection strength of the connection steel plate 2 and the middle beam 1 or the boundary beam 3. Specifically, the size of the body 21 of the connecting steel plate 2 can be designed slightly larger, so that the beam 4 can have a larger weldable area on the body 21, and the problems of high lofting precision requirement and difficult steel bar connection during the construction of the precast box girder are better solved. The body 21 may be a Q345 steel plate, and in particular, the size of the body 21 may be 300 × 300 × 6 mm.

In an alternative embodiment, referring to fig. 4, the connecting bar 22 is in a zigzag shape, and the connecting bar 22 includes a connecting arm 221 and two arms 222 connected to both ends of the connecting arm 221; the connecting arm 221 is connected with the body 21, and the support arm 222 is connected with the framework steel bar.

According to the above embodiment, the connecting reinforcement 22 may be in a shape of a Chinese character 'ji', and such a structural arrangement may enable the connecting reinforcement 22 to be welded to the body 21 through the connecting arm 221, so as to increase the length of the weld between the connecting reinforcement 22 and the body 21, thereby improving the connection strength between the connecting reinforcement 22 and the body 21; meanwhile, the end part of the support arm 222 is bent and extended outwards, and due to the structural arrangement, on one hand, the connecting steel bars 22 can be welded and connected with the framework steel bars of the middle beam 1 or the side beam 3 through the bent and extended sections of the support arm 222, so that the length of welding seams between the connecting steel bars 22 and the framework steel bars is increased, and the connecting strength between the connecting steel bars 22 and the framework steel bars is improved; on the other hand, the tip of support arm 222 outwards buckles to extend the setting, can make support arm 222 form colluding the form to make support arm 222 can collude in the concrete, strengthened the cohesion of connecting reinforcement 22 with well roof beam 1 or boundary beam 3, further improved the joint strength of connecting steel plate 2 with well roof beam 1 or boundary beam 3.

In an alternative embodiment, the connecting bars 22 may be deformed steel bars, and specifically, C16HRB400 deformed steel bars may be used, so as to increase the outer diameter of the connecting bars 22, improve the tensile strength of the connecting bars 22, and further improve the connecting strength between the connecting bars 22 and the framework bars.

In an alternative embodiment, referring to fig. 2 and 3, the angle of inclination of the raker beam 51 relative to the cross beam 4 may be 30-60 degrees, and particularly may be 45 degrees, so as to ensure that the raker beam 51 and the cross beam 4 form a more stable triangular structure, thereby better improving the integrity of the box beam.

In order to ensure the waterproof and corrosion-resistant performance of the connecting steel plates 2, the cross beams 4 and the supporting beams 5, and thus prolong the service life of the box girder bridge structure, in an alternative embodiment, epoxy resin mortar layers and rust-proof paint layers are sequentially arranged on the surfaces of the connecting steel plates 2, the cross beams 4 and the raking beams 51 from inside to outside. Wherein, the thickness of the epoxy resin mortar is not less than 2mm, and the antirust paint layer can be two layers.

In an alternative embodiment, the cross beam 4 may be a section steel; the raker beam 51 can be a channel steel, and the channel steel has better torsion resistance. In particular, the cross beam 4 may be a HW200 × 200 × 8 × 12mm Q345 section steel; the steel diagonal brace can be No. 8 channel steel.

As shown in fig. 5 and with reference to fig. 1 to 4, an embodiment of the present invention further provides a construction method of a small-radius box girder bridge structure, including:

101. arrange the skeleton reinforcing bar of prefabricated case roof beam, wherein, prefabricated case roof beam includes well roof beam 1 and boundary beam 3, and the skeleton reinforcing bar includes well roof beam skeleton reinforcing bar and boundary beam skeleton reinforcing bar.

102. And manufacturing the connecting steel plates 2, and respectively connecting the connecting steel plates 2 with the web steel bars of the framework steel bars.

Wherein, the connection steel plate 2 can include a body 21 and a connection steel bar 22, and the manufacturing of the connection steel plate 2 specifically can include: the connecting steel bar 22 is bent into a zigzag shape, and then the connecting arm 221 of the connecting steel bar 22 is welded to the surface of one side of the body 21, thereby completing the connecting steel plate 2. Moreover, connect a plurality of steel connecting plate 2 respectively with the web reinforcing bar of skeleton reinforcing bar and specifically can include: the bent extensions at the ends of the arms 222 of the connecting bars 22 are welded to the web bars.

It should be noted that, the web reinforcing bar includes the web reinforcing bar of well roof beam and the web reinforcing bar of boundary beam, and specifically, the web reinforcing bar of well roof beam 1 both sides all is connected with a plurality of steel connecting plate 2, is connected with a plurality of steel connecting plate 2 on the unilateral web reinforcing bar of boundary beam 3, and a plurality of steel connecting plate 2 on the web reinforcing bar of well roof beam 1 and boundary beam 3 divide into two rows of at least that arrange from top to bottom in proper order, and each steel connecting plate 2 interval in every row of steel connecting plate 2 sets up, and follows the length direction of well roof beam 1 or boundary beam 3 arranges.

103. And pouring concrete of the prefabricated box girder, and sequentially erecting a middle girder 1 and an edge girder 3 of the prefabricated box girder according to a preset sequence.

The preset sequence can be that the center sills 1 are arranged side by side, and the edge sills 3 are positioned on two sides of the center sill 1. After the concrete is poured, the connecting surface of the connecting steel plate 2 is exposed out of the webs of the middle beam 1 and the edge beam 3, that is, the surface of one side of the body 21 of the connecting steel plate 2, which is away from the connecting steel bar 22, is exposed out of the webs, so that the cross beam 4 and the side surface of the connecting steel plate 2 are welded.

104. The plurality of cross members 4 are connected between the webs of two adjacent center sills 1 and between two corresponding connecting steel plates 2 between the side sill 3 and the web of the center sill 1 adjacent thereto.

105. A plurality of support beams 5 are respectively connected between the webs of two adjacent middle beams 1 and between each two vertically adjacent cross beams 4 in the same section between the edge beam 3 and the web of the adjacent middle beam 1,

the support beam 5 may include at least two raker beams 51, and the at least two raker beams 51 are respectively connected between the two cross beams 4 located in the same cross section in an inclined manner and form a triangle with the cross beams 4.

The construction method of the small-radius box girder bridge structure provided by the embodiment of the invention is characterized in that the connecting steel plates 2 are embedded in the webs at the two sides of the middle girder 1 and the web at one side of the edge girder 3, and between the opposite connecting steel plates 2 of the two adjacent middle girders 1, and a cross beam 4 is connected between the edge beam 3 and the opposite connecting steel plate 2 of the center beam 1, the cross beam 4 ensures the transverse connection between the center beam 1 and the edge beam 3, and at the same time, a support beam 5 is connected between the two cross beams 4 in the same section, the connection stability between the middle beam 1 and the edge beam 3 is improved through the support beam 5, thereby improving the overall performance of the box girder, and, the support beam 5 includes at least two raker beams 51, the at least two raker beams 51 and the cross beam 4 form a triangle, so that the connection stability between the middle beam 1 and the side beam 3 is further improved, and the overall performance of the box beam is further improved. Compared with the prior art, the technical scheme provided by the embodiment of the invention adopts the cross beam 4 and the support beam 5 to replace a concrete diaphragm plate which needs to be prefabricated synchronously with the box girder, so that the section of the template does not need to be continuously adjusted when the box girder is prefabricated, and the difficulty and the cost of manufacturing the template are reduced; moreover, because the connecting steel plates 2 pre-buried on the webs of the middle beam 1 and the edge beam 3 are of plate-shaped structures, the connecting steel plates 2 have connecting surfaces with certain areas, and the cross beam 4 can be connected to the central position of the connecting steel plates 2 and also can be connected to the position deviated from the center when the cross beam 4 is connected, so that the problems of high lofting precision requirement and difficult steel bar connection during the construction of the prefabricated box beam are solved.

Further, in an embodiment of the present invention, after step 105, the method further includes: carry out sealed waterproof anticorrosive treatment to connecting steel plate 2, crossbeam 4 and a supporting beam 5 to improve connecting steel plate 2, crossbeam 4 and a supporting beam 5's waterproof anticorrosive ability, thereby prolong this box girder bridge structure's life.

Specifically, the sealing, waterproof and anticorrosive treatment of the connecting steel plate 2, the cross beam 4 and the support beam 5 may specifically include: removing oil stains and iron rust on the surfaces of the connecting steel plate 2, the cross beam 4 and the supporting beam 5;

coating epoxy resin mortar layers on the surfaces of the connecting steel plate 2, the cross beam 4 and the support beam 5 after removing oil stains and iron rust; wherein, the thickness of the epoxy resin mortar layer is not less than 2 mm.

And coating the surface of the epoxy resin mortar layer with antirust paint, wherein the antirust paint can be specifically coated with two layers.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A small radius box girder bridge structure, comprising:

the connecting steel plate group comprises a plurality of middle beams which are arranged side by side, wherein at least two rows of connecting steel plate groups which are sequentially arranged from top to bottom are embedded in webs on two sides of each middle beam, and each row of connecting steel plate groups comprises a plurality of connecting steel plates which are arranged at intervals;

the edge beams are positioned on the side parts of the plurality of middle beams, and at least two rows of connecting steel plate groups which are sequentially arranged from top to bottom are embedded in a web plate on one side of the edge beam adjacent to the middle beams;

the cross beams are positioned between two adjacent middle beams and between the middle beams and the edge beams, are respectively connected between two corresponding connecting steel plates, and are positioned in the same section;

the supporting beams comprise at least two inclined supporting beams, and the inclined supporting beams are obliquely connected between the two cross beams in the same section and form a triangle with the cross beams.

2. The small-radius box girder bridge structure according to claim 1,

the connecting steel plate comprises a body and a connecting steel bar connected with one side surface of the body;

the connecting steel bars are connected with the framework steel bars of the middle beam or the side beam, and the surface of the other side of the body is exposed out of the web plate and connected with the cross beam.

3. The small-radius box girder bridge structure according to claim 2,

the connecting steel bar is in a shape of a Chinese character 'ji', and the connecting steel bar comprises a connecting arm and two support arms respectively connected to two ends of the connecting arm;

the connecting arm is connected with the body, and the supporting arm is connected with the framework steel bar.

4. The small-radius box girder bridge structure according to claim 2,

the connecting steel bars are deformed steel bars.

5. The small-radius box girder bridge structure according to claim 1,

the inclined angle of the inclined supporting beam relative to the cross beam is 30-60 degrees.

6. The small-radius box girder bridge structure according to claim 1,

and epoxy resin mortar layers and antirust paint layers are sequentially arranged on the surfaces of the connecting steel plate, the cross beam and the diagonal bracing beam from inside to outside.

7. The small-radius box girder bridge structure according to claim 1,

the cross beam is made of profile steel; the inclined supporting beam is a channel steel.

8. A construction method of a small-radius box girder bridge structure applied to the small-radius box girder bridge structure according to any one of claims 1 to 7, comprising:

arranging framework steel bars of the prefabricated box girder;

manufacturing connecting steel plates, and respectively connecting the connecting steel plates with web plate reinforcing steel bars of the framework reinforcing steel bars;

pouring concrete of the prefabricated box girder, and sequentially erecting a middle girder and an edge girder of the prefabricated box girder according to a preset sequence; the connecting surface of the connecting steel plate is exposed out of the webs of the middle beam and the side beam;

connecting a plurality of cross beams between the webs of two adjacent center girders and between two corresponding connecting steel plates between the edge beam and the web of the center girder adjacent to the edge beam;

and respectively connecting a plurality of support beams between the webs of two adjacent center girders and between each two vertically adjacent cross beams in the same section between the edge beam and the web of the center girder adjacent to the edge beam.

9. The construction method according to claim 8, wherein after connecting a plurality of support beams respectively between the webs of two adjacent center sills and between each of two vertically adjacent cross beams in the same section between the edge beam and the web of the center sill adjacent thereto, the method further comprises:

and carrying out sealing, waterproof and anticorrosive treatment on the connecting steel plate, the cross beam and the supporting beam.

10. The construction method according to claim 9, wherein the waterproof and anticorrosive treatment of the connecting steel plates, the cross beams and the support beams specifically comprises:

removing oil stains and iron rust on the surfaces of the connecting steel plate, the cross beam and the supporting beam;

coating epoxy resin mortar layers on the surfaces of the connecting steel plate, the cross beam and the supporting beam after removing oil stains and iron rust;

and coating antirust paint on the surface of the epoxy resin mortar layer.

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