A bridge structure and construction method thereof

Abstract

The present invention discloses a bridge structure and a construction method thereof, comprising: a bridge deck and at least two main beams, wherein the main beam is an I-shaped beam of a reinforced concrete structure, wherein the main beam comprises: an upper flange 1, a lower flange 1 and a web 1, wherein all the main beams are arranged in parallel with each other, and the bridge deck is arranged on the top surface of the main beam. The present invention sets the main beam as an I-shaped beam of a reinforced concrete structure, simplifies the upper flange 1, and sets up a separate bridge deck on the top surface of the main beam, thereby improving the connection form of the bridge deck and the main beam from a traditional integrated structure to a separate structure, so that the bridge deck can adapt to the main beam with a height difference, and there will be no misaligned steps, thereby achieving the effect that the bridge can adapt to the transverse slope well, and ensuring that the road surface is not affected, thereby improving its durability. The bridge structure has no traditional middle transverse partition, and there is no need to support formwork at the construction site, and a large amount of steel bar binding work is reduced, which greatly improves the assembly rate and production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of bridges, and in particular to a bridge structure and a construction method thereof. Background Art

[0002] The upper structure of the bridge includes: the main beam and the bridge deck. The main beam and the bridge deck are the main components that bear the upper load of the bridge. The traditional main beam is a T-beam or a box beam. The upper flange of the traditional main beam is the bridge deck. During the bridge erection process, when the bridge deck is set with a cross slope, the top elevations of the two adjacent traditional main beams are inconsistent. The traditional main beam and the bridge deck are an integrated structure, and the bridge deck cannot adjust the angle. The two adjacent traditional main beams are connected by a longitudinal wet joint, but the width of the longitudinal wet joint is very narrow, resulting in a very steep slope of the longitudinal wet joint. The top of the traditional main beam has an offset step along the horizontal direction of the bridge, which cannot meet the use function of the bridge deck. The existing technology uses a 10-centimeter concrete leveling layer on the top surface of the traditional main beam to compensate for the problem of the misaligned steps. A road surface is set on the leveling layer, such as a 10-centimeter asphalt concrete layer. When the cross slope is relatively large, the thickness of the leveling layer at the misaligned step is 0, and even the thickness of the road surface is reduced, resulting in weak stress on the road surface, which is easy to crack and damage under the action of the upper load, thereby endangering the safety of the bridge structure.

[0003] Based on the above situation, a bridge structure and a construction method thereof are urgently needed to solve the problem that the traditional main beam and bridge deck are an integrated structure, and misaligned steps will appear when encountering a cross slope, resulting in a weak structural layer on the road surface and easy cracking. Summary of the invention

[0004] The purpose of the present invention is to provide a bridge structure and a construction method thereof, so as to solve the problem that the traditional main beam and bridge deck are an integrated structure, and misaligned steps will appear when encountering a transverse slope, causing the road surface to have weak stress and easy cracking.

[0005] In order to achieve the object, the present invention provides a bridge structure, comprising:

[0006] A bridge deck and at least two main beams, wherein the main beams are I-beams of reinforced concrete structure, and the main beams include: an upper flange, a lower flange and a web, and all the main beams are arranged parallel to each other, and the bridge deck is arranged on the top surface of the main beams.

[0007] In order to cancel the integrated structure of the traditional main beam and bridge deck, this solution shortens the upper flange of the main beam. The main beam is an I-beam of reinforced concrete structure, that is, the function of the traditional main beam upper flange as a bridge deck is cancelled, and then a separate bridge deck is set up on the top of the main beam. In this way, there is no need to set wet joints between the upper flanges of the main beams, which saves the process of pouring wet joints at multiple construction sites, reduces the project cost, and shortens the construction period. When the bridge deck needs to be set with a transverse slope, that is, when the top elevations of the two adjacent main beams are different, the separated bridge deck can better adapt to the transverse height difference of the main beam under the condition that the distance between the two adjacent main beams remains unchanged, and will not produce misaligned steps, will not affect the road surface on the bridge deck, and ensure the thickness of the road surface, thereby solving the problem of weak structural layers and easy cracking in the road surface, and no additional leveling layer is required. The bridge deck in this solution adopts the structural form in the prior art, such as cast-in-place structure and prefabricated structure. The main beam adopts an I-beam, which eliminates the function of the upper flange as the bridge deck and shortens the upper flange, so that the steel skeleton structure of the main beam is simplified compared with the traditional main beam, and can be intelligently tied by robots, greatly improving production efficiency.

[0008] Preferably, end partitions are provided at both ends of the main beam, and the end partitions connect the two laterally adjacent main beams. A plurality of transverse ribs and a plurality of vertical ribs are arranged between the two end partitions on the same main beam, and the vertical ribs are connected to the side surfaces of the web one, and the two ends of the transverse ribs are respectively connected to the side surfaces of the upper flange one of the two laterally adjacent main beams.

[0009] By setting end diaphragms at both ends of the main beam and vertical ribs on the web, the transverse ribs of two adjacent main beams along the transverse direction of the bridge are connected, and the scattered main beams are connected into an integral frame. The bridge superstructure can better coordinate the force, thereby improving the overall strength and rigidity of the bridge superstructure. The transverse diaphragms of the traditional main beams are eliminated, and there is no need to cast transverse diaphragms multiple times at multiple construction points, which reduces construction processes and shortens the construction period.

[0010] Preferably, the bridge deck is a combined bridge deck, which includes an upper cast-in-place concrete slab and a plurality of prefabricated bottom slabs. The sides of the prefabricated bottom slabs are built on the top surface of the main beam. The transverse ribs include steel formworks, and the two ends of the steel formworks are respectively connected to the corresponding side surfaces of the upper flange. The transverse ribs and the cast-in-place concrete slabs are an integrally cast structure.

[0011] The bridge deck is a combined bridge deck, including an upper cast-in-place concrete slab and a number of precast bottom plates on the lower layer. After the main beam is installed, a number of precast bottom plates are erected on the top surface of the main beam to form a bottom formwork for the cast-in-place concrete slab. The two ends of the steel formwork are respectively connected to the side surfaces of the corresponding upper flange, and the steel formwork is wrapped around the outside of the transverse ribs. The steel formwork and a number of precast bottom plates are spliced ​​into an integral formwork. On this integral formwork, the transverse ribs and the cast-in-place concrete slab are cast and formed as one piece. The precast bottom plate and the steel formwork do not need to be removed. After the cast-in-place concrete slab and the transverse ribs are formed, the precast bottom plate and the steel formwork participate in the force and jointly bear the bridge deck load, which simplifies the construction steps and shortens the construction period. The cast-in-place concrete slab is an integrated cast-molded structure with better integrity, which can better participate in the structural force and connect multiple discrete main beams into a whole, thereby improving the integrity of the bridge superstructure.

[0012] Preferably, the steel reinforcement skeleton of the transverse ribs and the steel reinforcement skeleton of the cast-in-place concrete slab are an integrally formed structure.

[0013] The steel skeleton of the transverse ribs and the steel skeleton of the cast-in-place concrete slab are formed in one piece, and can be pre-produced in a factory or on a construction site, and then hoisted as a whole onto the prefabricated base plate, without the need to tie steel bars on the bridge structure. In this way, the traditional process of hoisting and tying steel bars is improved to the process of pre-producing the steel skeleton and hoisting the steel bars. The pre-production of the steel skeleton does not need to wait until the prefabricated base plate is laid. The two can be carried out simultaneously, shortening the construction period.

[0014] Preferably, a connecting steel is provided in the end partition, and the connecting steel is used to connect the two adjacent main beams in the transverse direction of the bridge.

[0015] The connecting steel is used to quickly connect several main beams, so that multiple scattered main beams form a whole with a certain strength. Then the main beam of the next span can be transported on the main beam, and the two spans can be constructed at the same time, shortening the construction time. After the main beam of the next span is transported, the end partition is cast to further strengthen the overall connection performance between several main beams.

[0016] Preferably, the precast base plate is a precast concrete plate.

[0017] The prefabricated base plate uses prefabricated concrete slabs, which can be produced quickly. Compared with prefabricated steel base plates, the production cost is greatly reduced. In addition, the prefabricated concrete slabs do not have the multiple processes of leveling, stiffening plate positioning, stiffening plate welding, welding deformation correction, weld inspection, and construction of anti-corrosion coatings of prefabricated steel base plates, which shortens the construction period.

[0018] Preferably, no steel bars are arranged in the precast concrete slab, the thickness of the precast concrete slab is 2-4 cm, and the two plate edges of the precast concrete slab along the transverse direction are provided with edging steel sections, the edging steel sections include a second lower flange and a second web, the bottom surface of the second lower flange is flush with the bottom surface of the precast concrete slab, the height of the second web is greater than or equal to the thickness of the precast concrete slab, and the precast concrete slab is a concrete member with a compressive strength greater than or equal to 150 MPa and a flexural strength greater than or equal to 20 MPa.

[0019] The precast concrete slab is not provided with steel bars, so that the thickness of the precast concrete slab can be reduced to 2-4 cm. It is cast with concrete having a compressive strength greater than or equal to 150MPa and a flexural strength greater than or equal to 20MPa. This concrete can use ultra-high-strength concrete with a label of C120, so that when the thickness of the precast concrete slab is reduced to 2-4 cm, it can still maintain sufficient strength and rigidity. Edge steel is provided on the edge of the precast concrete slab. The edge steel is used to cover the two lateral edges of the precast concrete slab along the bridge. The edge steel is arranged along the entire length of the slab edge it covers. The edge steel can be made of channel steel or angle steel. When channel steel is used, the top surface of the second upper flange of the channel steel is flush with the top surface of the precast concrete slab, the bottom surface of the second lower flange of the channel steel is flush with the bottom surface of the precast concrete slab, and the height of the second web of the channel steel is equal to the thickness of the precast concrete slab; when angle steel is used, the bottom surface of the second lower flange of the angle steel is flush with the bottom surface of the precast concrete slab, and the height of the second web of the angle steel is greater than or equal to the thickness of the precast concrete slab. The edge steel itself has high strength and rigidity. When combined with the precast concrete slab, its construction technology can ensure that the steel and concrete are subjected to force together, which plays a role in strengthening the bending and tensile strength and rigidity of the precast concrete slab, improving the precast concrete slab's ability to resist bending deformation and damage under load, and further ensuring the safety of the structure. By reducing the thickness of the precast concrete slab, the thickness of the upper cast-in-place concrete slab is increased, that is, the cross-sectional height of the cast-in-place concrete slab is increased, thereby increasing the bearing capacity of the cast-in-place concrete slab, and then increasing the stiffness and strength of the composite bridge deck, thereby improving its overall bearing capacity.

[0020] Preferably, two adjacent precast concrete slabs in the longitudinal direction are connected by edge-wrapped steel sections.

[0021] By welding or bolting the edge steel, the two adjacent precast concrete slabs in the longitudinal direction of the bridge are connected, which can achieve quick connection, shorten the construction period, and ensure a tight and reliable connection without leakage, thereby ensuring the molding quality of the cast-in-place concrete slab and the molding quality of the bridge superstructure.

[0022] Preferably, a plurality of holes are longitudinally spaced apart on the edge steel.

[0023] Several holes are arranged at intervals in the longitudinal direction on the edge steel. During the production process of the precast concrete slab, the holes form shear tenons. The shear tenons and holes are engaged together, which greatly increases the connection performance of the edge steel and the precast concrete slab. The holes can be arranged on the second upper flange, the second lower flange, and the second web, or only on the second lower flange and the second web, or only on the second upper flange and the second web. The hole diameter is 5-10 mm, and the center distance between two adjacent holes in the longitudinal direction of the edge steel is 3-6 cm.

[0024] The present invention has at least the following beneficial effects:

[0025] This scheme changes the traditional integrated structure of main beam and bridge deck into a separate bridge deck erected on the main beam, so that the bridge can adapt to the cross slope well, ensure that the road surface is not affected, and improve its durability. By pre-producing the integrated steel skeleton of the main beam, precast concrete slab, transverse rib, connecting steel, cast-in-place concrete slab and transverse rib, the production speed is increased and the production cost is reduced. In addition, the pre-production of the above components can better control the quality and ensure the quality of the bridge. There is no need to carry out a large number of steel frame binding operations on the bridge. There is only the connection between the precast steel skeletons. There is no need to support additional formwork. The steel formwork and precast concrete slab do not need to be removed, so that the on-site construction process is improved from the traditional formwork, steel bar binding, concrete pouring, and formwork removal to formwork installation, steel bar hoisting, and concrete pouring, which directly simplifies the construction steps and greatly shortens the construction period. This scheme transforms labor-intensive construction into mechanical assembly construction, realizing industrial transformation and upgrading. The precast concrete slab increases the thickness of the cast-in-place concrete slab by reducing the thickness to 2-4 cm, thereby improving the overall bearing capacity of the combined bridge deck. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is an elevation view of the bridge structure of the present invention.

[0027] Figure 2 yes Figure 1 Cross-sectional view at AA in the middle.

[0028] Figure 3 yes Figure 1 A local enlarged schematic diagram of point B in the middle.

[0029] Figure 4 It is a structural schematic diagram of the combined bridge deck of the present invention.

[0030] Figure 5 It is a structural schematic diagram of the precast concrete slab of the present invention.

[0031] Figure 6 This Figure 5 A partial enlarged schematic diagram of .

[0032] Figure 7 It is a schematic diagram of the connection state of the main beam of the present invention.

[0033] Figure 8 It is a structural schematic diagram of the main beam of the present invention.

[0034] Fig. 9 It is a data chart of the bending-tension bearing capacity test of the precast concrete slab of the present invention.

[0035] Figure numbers: 1-main beam, 101-upper flange one, 102-lower flange one, 103-web one, 2-end partition, 3-vertical rib, 4-transverse rib, 5-connecting steel, 6-steel formwork, 7-bridge deck, 701-cast-in-place concrete slab, 702-precast concrete slab, 7011-edging steel, 7012-hole. DETAILED DESCRIPTION

[0036] The technical content of the present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0037] Example 1

[0038] like Figure 1-8 As shown, the bridge structure in this scheme includes: a bridge deck 7 and at least two main beams 1, the main beam 1 adopts an I-beam of a reinforced concrete structure, the main beam 1 includes an upper flange 101, a lower flange 102 and a web 103, all the main beams 1 are arranged parallel to each other, and end partitions 2 are arranged at both ends of the main beam 1, the end partitions 2 connect two laterally adjacent main beams 1, and connecting steel 5 for connecting two laterally adjacent main beams 1 is arranged in the end partitions 2, and a plurality of transverse connecting systems and a plurality of vertical ribs 3 are arranged between the two end partitions 2 on the same main beam 1, and the vertical ribs 3 are connected to the side of the web 103, and the transverse connecting system is preferably a transverse rib 4, and the two ends of the transverse rib 4 are respectively connected to the side of the upper flange of the two laterally adjacent main beams 1, and the transverse rib 4 includes a steel template 6, and the two ends of the steel template 6 are respectively connected to the side of the corresponding upper flange 101.

[0039] The bridge deck 7 is arranged on the top surface of the main beam 1. The bridge deck 7 is a combined bridge deck, including a cast-in-place concrete slab 701 on the upper layer and a plurality of precast concrete slabs 702 on the lower layer. No steel bars are arranged in the precast concrete slab 702. The thickness of the precast concrete slab 702 is 2 cm. The precast concrete slab 702 is provided with channel steel along the two plate edges along the transverse direction of the bridge. The channel steel includes two upper flanges, two lower flanges and two webs. The top surface of the second upper flange is flush with the top surface of the precast concrete slab 702, the bottom surface of the second lower flange is flush with the bottom surface of the precast concrete slab 702, the height of the second web is greater than or equal to the thickness of the precast concrete slab 702, and the precast concrete slab 702 is a concrete member with a compressive strength greater than or equal to 150 MPa and a flexural tensile strength greater than or equal to 20 MPa.

[0040] The sides of the precast concrete slab 702 are erected on the top surface of the main beam 1, and the two adjacent precast concrete slabs 702 in the longitudinal bridge direction are connected by welding through channel steel. A plurality of holes 7012 are longitudinally spaced on the upper flange 2, the lower flange 2 and the web 2 of the channel steel. The holes 7012 are used to form shear tenons during the casting process of the precast concrete slab 702. The steel frame of the transverse rib 4 and the steel frame of the cast-in-place concrete slab 701 are an integrally formed structure, and the cast-in-place concrete slab 701 and the transverse rib 4 are an integrally cast structure.

[0041] This solution shortens the upper flange 101 of the main beam 1. The main beam 1 is an I-beam of a reinforced concrete structure, that is, the function of the upper flange of the traditional main beam 1 as the bridge deck 7 is cancelled, and then a separate bridge deck 7 is erected on the top of the main beam 1. In this way, there is no need to set a wet joint between the upper flange 101 of the main beam 1, which saves the process of pouring the wet joint multiple times and at multiple construction sites, reduces the project cost, and shortens the construction period. When the bridge deck needs to be set with a transverse slope, that is, when the top elevations of two adjacent main beams 1 are different, the separated bridge deck 7 can better adapt to the lateral height difference of the main beam 1 while the distance between the two adjacent main beams 1 remains unchanged, and will not produce misaligned steps or affect the road surface on the bridge deck 7, thereby ensuring the thickness of the road surface, thereby solving the problem of structural weak layers and easy cracking in the road surface, and there is no need to set an additional leveling layer. The main beam 1 adopts an I-beam, cancels the function of the upper flange 101 as the bridge deck 7, and shortens the upper flange 101, so that the steel skeleton structure of the main beam 1 is simplified compared with the traditional main beam 1, and can be intelligently tied by robots, greatly improving production efficiency. The end diaphragms 2 set at both ends of the main beam 1 and the vertical ribs 3 set on the web are used to connect the transverse ribs 4 of two main beams 1 adjacent to each other along the transverse direction of the bridge. The vertical ribs 3 and the transverse ribs 4 are set correspondingly, so that the scattered main beams 1 are connected into an integral frame, and the bridge superstructure is better coordinated to bear the force, which improves the overall strength and rigidity of the bridge superstructure, and cancels the transverse diaphragms of the traditional main beam 1, so that there is no need to cast the transverse diaphragms at multiple construction points for multiple times, which reduces the construction process and shortens the construction period.

[0042] The construction method of this bridge structure is:

[0043] S1: In the same span, several main beams 1 are hoisted onto the cap beams respectively;

[0044] S2: connecting two adjacent main beams 1 in the transverse direction of the bridge by connecting steel 5, transporting the main beam 1 of the next span on the connected main beams 1, and then casting the end diaphragms 2 at the ends of the two adjacent main beams 1 in the transverse direction, wherein the end diaphragms 2 wrap the connecting steel 5;

[0045] S3: hoist the precast concrete slab 702 onto the main beam 1, so that the side of the precast concrete slab 702 is set on the top surface of the main beam 1, and the plate edge of the edge steel 7011 is set to be perpendicular to the main beam 1 in the horizontal plane, and the two ends of the steel template 6 are respectively connected to the corresponding side of the upper flange 101, so that the steel template 6 and the precast concrete slab 702 are connected to form an integral template;

[0046] S4: hoisting the cast-in-place concrete slab 701 and the integrated steel bar skeleton of the transverse rib 4 onto the integral formwork, so that the reserved steel bar 1 is connected to the cast-in-place concrete slab 701 part in the integrated steel bar skeleton, and the reserved steel bar 2 is connected to the transverse rib 4 part in the integrated steel bar skeleton;

[0047] S5: The cast-in-place concrete slab 701 and the transverse ribs 4 are integrally cast.

[0048] The method for making the precast concrete slab 702 is as follows: prepare two channel steels, the web of the channel steel is 2 cm high, the upper flange 2, the lower flange 2, and the web of the channel steel are provided with holes 7012, the hole diameter of the hole 7012 is 7 mm, and the center distance between two adjacent holes 7012 along the longitudinal direction of the channel steel is 4 cm, so as to form a shear tenon, enhance the connection performance between the channel steel and the precast concrete slab 702, use the channel steel as a template, cast the precast concrete slab 702, select concrete with a compressive strength greater than or equal to 150MPa and a bending tensile strength greater than or equal to 20MPa, and use To ensure that the 2 cm precast concrete slab 702 has high strength and toughness, to reduce the thickness, increase the thickness of the cast-in-place concrete slab 701, and thus improve the overall bearing capacity of the combined bridge deck 7, the top surface of the precast concrete slab 702 is flush with the top surface of the upper flange 2, the bottom surface of the precast concrete slab 702 is flush with the bottom surface of the lower flange 2, the thickness of the precast concrete slab 702 is equal to the height of the web 2, and within one hour after the pouring is completed, the upper surface of the precast concrete slab 702 is roughened to improve its bonding performance with the cast-in-place concrete slab 701.

[0049] The transverse rib 4 and the cast-in-place concrete slab 701 are cast in one piece, and the precast base plate and the steel formwork 6 do not need to be removed. After the cast-in-place concrete slab 701 and the transverse rib 4 are formed, the precast base plate and the steel formwork 6 participate in the stress and jointly bear the bridge deck load, which simplifies the construction steps and shortens the construction period. The cast concrete slab is an integrated cast structure with better integrity, which can better participate in the structural stress and connect multiple discrete main beams 1 into a whole, thereby improving the integrity of the bridge superstructure.

[0050] The steel skeleton of the transverse rib 4 and the steel skeleton of the cast-in-place concrete slab 701 are formed in one piece, and can be pre-produced in the factory or on the construction site, and then hoisted as a whole onto the prefabricated bottom plate, without the need to tie steel bars on the bridge structure; the reserved steel bar 1 is connected to the cast-in-place concrete slab 701 part of the integrated steel skeleton, and the reserved steel bar 2 is connected to the transverse rib 4 part of the integrated steel skeleton, both of which are plug-in connections, without the need for additional tying or welding. In this way, the traditional process of hoisting and tying steel bars is improved to the process of pre-producing and hoisting steel bars. The pre-production of the steel skeleton does not need to wait until the precast concrete is laid. The two can be carried out at the same time, shortening the construction period. In addition, the pre-production of the above-mentioned components can better control the quality and ensure the quality of the bridge.

[0051] The channel steel may also be provided with holes 7012 only on the lower flange 2 and the web 2. The provision of the holes 7012 allows the precast concrete slab 702 to form a shear tenon, thereby enhancing the connection performance between the precast concrete slab 702 and the channel steel.

[0052] The channel steel may also be provided with holes 7012 only on the second upper flange and the second web. The provision of the holes 7012 allows the precast concrete slab 702 to form a shear tenon, thereby enhancing the connection performance between the precast concrete slab 702 and the channel steel.

[0053] Precast concrete slab 702 bending and tension bearing capacity test data, such as Fig. 9 As shown: The experimental object of this experiment is: a precast concrete slab 702 with a specification of 100 cm * 50 cm * 2 cm. The purpose of the experiment is: to compare the bending and tensile bearing capacity of the precast concrete slab 702 with and without the edge steel 7011. (The specifications of the edge steel 7011 are: the second web height is 2 cm, the width of the second upper flange and the second lower flange are both 2 cm, and the thickness is 2 mm. The second upper flange, the second lower flange and the second web of the edge steel 7011 are all provided with holes 7012. The hole diameter of the hole 7012 is 7 mm. The center distance between two adjacent holes 7012 along the longitudinal direction of the edge steel 7011 is 4 cm. The setting method of the edge steel 7011 is as follows Figure 5 The test results show that the bending and tensile ultimate bearing capacity of the precast concrete slab 702 with the edge steel 7011 is 8.3 kN, while the bending and tensile ultimate bearing capacity of the precast concrete slab 702 without the edge steel 7011 is 3.5 kN. The former is 2.4 times of the latter, which is sufficient to prove that the edge steel 7011 greatly improves the bending and tensile bearing capacity of the precast concrete slab 702.

[0054] It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and those skilled in the art can make various forms of deformation and modification within the scope of the claims, which does not affect the essential content of the present invention.

Claims

1. A bridge structure, characterized in that: include: A bridge deck (7) and at least two main beams (1), wherein the main beams (1) are I-shaped beams of a reinforced concrete structure, the main beams (1) comprising: an upper flange (101), a lower flange (102) and a web (103), all the main beams (1) are arranged parallel to each other, and the bridge deck (7) is arranged on the top surface of the main beams (1); Both ends of the main beam (1) are provided with end partitions (2), the end partitions (2) connecting two transversely adjacent main beams (1), a plurality of transverse ribs (4) and a plurality of vertical ribs (3) are arranged between the two end partitions (2) on the same main beam (1), the vertical ribs (3) are connected to the side surfaces of the web plate 1 (103), and the two ends of the transverse ribs (4) are respectively connected to the side surfaces of the upper flange 1 (101) of the two transversely adjacent main beams (1); The bridge deck (7) is a combined bridge deck, comprising an upper cast-in-place concrete slab (701) and a plurality of prefabricated bottom slabs at a lower level, the side edges of the prefabricated bottom slabs being mounted on the top surface of the main beam (1), the transverse rib (4) comprising a steel formwork (6), the two ends of the steel formwork (6) being respectively connected to the side surfaces of the corresponding upper flange 1 (101), and the transverse rib (4) and the cast-in-place concrete slab (701) being an integrally cast structure; The prefabricated bottom plate is a prefabricated concrete plate (702), and no steel bars are arranged in the prefabricated concrete plate (702).

2. The bridge structure according to claim 1, characterized in that: The steel reinforcement frame of the transverse rib (4) and the steel reinforcement frame of the cast-in-place concrete slab (701) are an integrally formed structure.

3. The bridge structure according to claim 2, characterized in that: A connecting steel (5) is provided in the end partition (2), and the connecting steel (5) is used to connect two adjacent main beams (1) in the transverse direction of the bridge.

4. The bridge structure according to claim 1, characterized in that: The precast concrete slab (702) is provided with edge steel (7011) along the entire length of two plate edges in the transverse direction of the bridge, and the edge steel (7011) includes a lower flange 2 and a web 2, the bottom surface of the lower flange 2 is flush with the bottom surface of the precast concrete slab (702), the height of the web 2 is greater than or equal to the thickness of the precast concrete slab (702), and the precast concrete slab (702) is a concrete component with a compressive strength greater than or equal to 150 MPa and a flexural strength greater than or equal to 20 MPa.

5. The bridge structure according to claim 4, characterized in that: Two adjacent precast concrete slabs (702) in the longitudinal direction of the bridge are connected by edge-wrapped steel sections (7011).

6. The bridge structure according to claim 4, characterized in that: A plurality of holes (7012) are longitudinally spaced apart on the edge steel (7011).

7. A bridge structure construction method, characterized in that: The bridge structure construction method comprises the following steps: S1: In the same span, a plurality of main beams (1) are hoisted onto the cap beam respectively; the main beam (1) is an I-shaped beam of a reinforced concrete structure, the main beam (1) comprises an upper flange (101), a lower flange (102) and a web (103), both ends of the main beam (1) are provided with end partitions (2) and connecting steel (5), and a plurality of vertical ribs (3) and a plurality of transverse ribs (4) are provided between two end partitions (2) on the same main beam (1). ), the vertical rib (3) is connected to the side of the web plate 1 (103), the two ends of the transverse rib (4) are respectively connected to the side of the upper flange 1 (101) corresponding to the two laterally adjacent main beams (1), a reserved steel bar 1 for connecting to the cast-in-place concrete slab (701) is arranged on the top of the main beam (1), and a reserved steel bar 2 for connecting to the transverse rib (4) is arranged at the side of the upper flange 1 (101) at a position corresponding to the vertical rib (3); S2: connecting two adjacent main beams (1) in the transverse direction of the bridge by connecting steel (5), transporting the main beam (1) of the next span on the connected main beam (1), and then casting the end diaphragms (2) at the ends of the two adjacent main beams (1) in the transverse direction, wherein the end diaphragms (2) wrap the connecting steel (5); S3: The bridge deck (7) is a combined bridge deck, comprising an upper cast-in-place concrete slab (701) and a plurality of lower precast concrete slabs (702), wherein the precast concrete slab (702) has a thickness of 2-4 cm, and the precast concrete slab (702) is provided with edge-wrapped steel (7011) along two plate edges in the transverse direction of the bridge, wherein the edge-wrapped steel (7011) comprises a lower flange 2 and a web 2, wherein the bottom surface of the lower flange 2 is flush with the bottom surface of the precast concrete slab (702), the height of the web 2 is greater than or equal to the thickness of the precast concrete slab (702), and the precast concrete slab (702) has a compressive strength greater than or equal to 150 MPa and a flexural strength greater than or equal to 200 MPa. A concrete member having a pressure of 20 MPa; hoisting a precast concrete slab (702) onto the main beam (1) so that the side surface of the precast concrete slab (702) is arranged on the top surface of the main beam (1), and the plate edge of the edge steel (7011) is arranged to be perpendicular to the main beam (1) in a horizontal plane; and a cast-in-place concrete slab (701) is cast on the precast concrete slab (702); the transverse rib (4) includes a steel template (6), and the steel template (6) is used to cast the transverse rib (4); the two ends of the steel template (6) are respectively connected to the side surfaces of the corresponding upper flange (101); and the steel template (6) and the precast concrete slab (702) are connected to form an integral template; S4: hoisting the integrated steel bar skeleton of the cast-in-place concrete slab (701) and the transverse rib (4) onto the integral formwork, so that the reserved steel bar 1 is connected to the cast-in-place concrete slab portion of the integrated steel bar skeleton, and the reserved steel bar 2 is connected to the transverse rib portion of the integrated steel bar skeleton; S5: integrally casting the cast-in-place concrete slab (701) and the transverse rib (4).

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