CN221167436U - Drainage structures of steel case roof beam bridge - Google Patents

Abstract

The utility model relates to a drainage structure of a steel box girder bridge, which relates to the technical field of bridge drainage and comprises a steel box girder, a drainage assembly and a dust collecting assembly, wherein the drainage assembly and the dust collecting assembly are arranged on the steel box girder, a bridge surface layer is poured on the steel box girder, a plurality of drainage structures are arranged on the bridge surface layer, the drainage structures, the drainage assembly and the dust collecting assembly are all arranged in a plurality and the same number, rainwater at the bottom of a transverse slope of a bridge deck layer enters the drainage assembly through the drainage structures, the drainage assembly collects the rainwater and discharges the rainwater into a road drainage system, and the dust collecting assembly is used for collecting sundries entering the drainage assembly. The utility model can reduce the probability of pipeline blockage.

Description

Drainage structures of steel case roof beam bridge

Technical Field

The utility model relates to the technical field of bridge drainage, in particular to a drainage structure of a steel box girder bridge.

Background

The bridge is an indispensable road building in urban construction of modern society, and when rainy weather is met, in order to avoid potential safety hazards to pedestrians and vehicles caused by excessive accumulated water of the bridge, a drainage system is added in the existing bridge construction. The design of traditional bridge floor drainage system mainly sets up vertical and horizontal slope drainage on the bridge floor, sets up the water inlet in a large number on the steel case roof beam, buries the drain pipe, and after the precipitation is collected, rainwater gets into the water inlet through the drainage hole of bridge floor low slope department, then in the drain pipe with rainwater introduction road drainage system through pre-buried in the roof beam body and pier stud. The water inlet is formed, so that the stressed structure of the steel box girder is damaged to a certain extent, the effective width of the bridge deck is reduced, and potential safety hazards are brought to pedestrians and maintenance workers. At present, a drainage mode of punching a pre-buried drain pipe on a bridge surface layer is adopted more often.

At present, the publication day is 2023, 03 and 07, and the Chinese patent with publication number CN115748444A discloses a drainage system suitable for a steel box girder bridge deck, wherein a concrete bridge deck is poured on the steel box girder, a plurality of water collecting tanks are pre-buried in the concrete bridge deck, and the water collecting tanks are arranged at the bottom of a transverse slope on the concrete bridge deck; the water collecting tank is communicated with one end of a stainless steel pipe, the stainless steel pipe is communicated with a PVC pipe through a three-way pipe, and a three-way pipe top groove is formed in the top of the three-way pipe.

Rainwater on the concrete bridge deck is collected at the water collecting tank along the transverse slope, flows into the PVC pipe through the stainless steel pipe and the tee pipe, is finally discharged from the PVC pipe, and can be collected at the bridge pier or the bridge tower for centralized discharge when the rainfall intensity is low; when rainfall intensity is too big, the PVC pipe can't in time drain, can set up the three-way pipe roof groove at the three-way pipe top, and the rainwater overflows from the three-way pipe roof groove, carries out the scattered drainage with the unable in time exhaust rainwater of PVC pipe, realizes concentrating + scattered drainage mode.

According to the technical scheme, after the long-time use, sediment and fragments are easy to deposit in the bridge, so that the pipeline is blocked, the effective drainage of the bridge is influenced, and the durability of the pipeline and related components of the bridge is damaged.

Disclosure of utility model

In order to reduce the probability of pipeline blockage, the utility model provides a drainage structure of a steel box girder bridge.

The utility model provides a drainage structure of a steel box girder bridge, which adopts the following technical scheme:

The utility model provides a drainage structures of steel case roof beam bridge, includes steel case roof beam and sets up the drainage subassembly on the steel case roof beam, pour the bridge surface course on the steel case roof beam, a plurality of first water discharge openings have been seted up along length direction to the horizontal slope bottom of bridge surface course, a plurality of first water discharge openings department is provided with the same first rain grate of quantity, drainage subassembly includes water drain pipe, header tank and drain pipe, the header tank sets up the one end of keeping away from the bridge surface course at the steel case roof beam, the water drain pipe slope sets up in the bridge surface course, water drain pipe one end intercommunication first water discharge opening, the other end intercommunication header tank, the one end that the water drain pipe is close to first water discharge opening is higher than the other end, the outlet has been seted up on the header tank, drain pipe one end intercommunication outlet, the other end intercommunication road drainage system, its characterized in that:

the drainage assembly further comprises a blocking net arranged in the water collecting tank, one end of the drainage pipe, which is close to the water collecting tank, is located below the blocking net, and the drainage outlet is located above the blocking net.

By adopting the technical scheme, in the early stage of rainfall, a large amount of mud dust, fragments and other sundries on the bridge surface layer are carried by rainwater, the rainwater is collected at the slope bottom along a transverse slope, larger sundries are blocked by a first rainwater grate, the rainwater and smaller sundries enter a drain pipe through a first drain outlet and enter a water collecting tank along the drain pipe, the heavier sundries are deposited at the bottom of the water collecting tank, the lighter sundries rise along with the rising of the water level, the blocking net further blocks the larger sundries, when the height of the rainwater in the water collecting tank reaches the water outlet, the rainwater enters a drain pipe from the water outlet, is discharged into a road drainage system through the drain pipe, after the rainfall is stopped, a worker opens the water collecting tank to clean the sundries at the bottom of the water collecting tank, and then closes the water collecting tank; by the arrangement, a certain amount of impurities such as silt and fragments are limited below the blocking net, the probability of the impurities entering the pipeline is reduced, the probability of pipeline blockage is reduced, the labor intensity of pipeline overhaul is reduced, and the bridge is facilitated to drain rapidly and effectively.

Optionally, the blocking net is obliquely arranged, and one end of the blocking net, which is close to the drain pipe, is higher than the other end of the blocking net.

Through adopting above-mentioned technical scheme, when the rainwater that accumulates in the header tank is great, lighter debris rises along with the rising of water level, like foam, plastics etc., the block is further blockked to the great debris of volume, because the block is the slope setting, debris will rise along the block, and accumulate between block upper end and header tank inner wall, make debris be difficult for causing the shutoff to the block, make the rainwater can follow the area between block lower extreme and the header tank inner wall and upwards flow, so set up, with the lighter and great debris restriction of volume of a certain amount between block and header tank inner wall, the probability of block shutoff is reduced, be favorable to the quick of bridge, effective drainage.

Optionally, the drain assembly further comprises a filter screen, the filter screen being disposed at the drain opening.

Through adopting above-mentioned technical scheme, when the height of rainwater in the header tank reached outlet department, the rainwater got into the drain pipe from outlet department, and the filter screen is further filtered debris in the rainwater, and the rainwater after the filtration is discharged into the road drainage system through the drain pipe, makes debris be difficult for accumulating in the pipeline, has reduced the probability that the pipeline blockked up.

Optionally, the drainage assembly further comprises a drainage elbow, one end of the drainage elbow is communicated with the water outlet, the other end of the drainage elbow is communicated with the drainage pipe, and one end of the drainage elbow, which is close to the water outlet, is higher than the other end of the drainage elbow.

Through adopting above-mentioned technical scheme, when the height of rainwater reaches outlet department in the header tank, the rainwater gets into the drainage return bend from outlet department, and the rainwater is discharged into road drainage system along drainage return bend and drain pipe, and the drainage return bend that the slope set up makes debris such as mud dirt be difficult for accumulating in the pipeline, has reduced the probability that the pipeline blockked up.

Optionally, the steel box girder is further provided with a dust collection assembly, the dust collection assembly comprises a dust collection box, and the dust collection box is detachably connected to the bottom of the water collection box.

Through adopting above-mentioned technical scheme, after debris enter into the header tank, heavier debris deposit downwards to the dust bin bottom, after stopping the rainfall, the workman can lift off the dust bin to clear up the dust bin inside, later install the dust bin and reset, improved clear convenience, reduced intensity of labour.

Optionally, the outer wall of dust collection box one side protrusion is in the outer wall of header tank, dust collection subassembly still includes the maintenance valve, the maintenance valve sets up in the upper surface of dust collection box protrusion in header tank one end.

By adopting the technical scheme, after rainfall is stopped, a worker can check the collection condition of sundries in the dust box by opening the overhaul valve, if fewer sundries are collected, the worker can directly clean the sundries at the bottom of the dust box through the overhaul valve, and then the overhaul valve is closed; if the collected sundries are more, the worker can detach the dust box, so that the inside of the dust box is cleaned, and then the dust box is installed and reset, so that the cleaning convenience is improved, and the labor intensity is reduced.

Optionally, an inner wall of the other side opposite to the side of the dust collection box protruding from the water collection box forms a slope.

Through adopting above-mentioned technical scheme, after debris enters into the header tank, heavier debris deposit downwards and along the domatic landing of dust collection box inner wall dust collection box bottom makes debris be difficult for piling up in the dust collection box inside one end of keeping away from the maintenance valve for the deposit speed of debris, the inside condition of observation through the maintenance valve more directly perceived accurate has improved the convenience of use.

Optionally, a second water drain port is formed in the upper end of the water collection tank, and a second rainwater grate is arranged at the second water drain port.

Through adopting above-mentioned technical scheme, when rainfall is too big, and during the rainwater was crossed the bridge surface course, the rainwater got into the header tank through the second water discharge mouth, and great debris is blocked by the second rainwater comb, makes the rainwater in time collect the header tank, in the road drainage system is discharged through the drain pipe, has accelerated the drainage rate of rainwater, is favorable to the quick of bridge, effective drainage, simultaneously, makes the difficult steel case roof beam bridge below of going into of mode of arranging in bulk to a certain amount of rainwater, has reduced the potential safety hazard that causes pedestrian and vehicle, makes drainage structures's use more convenient and humanized.

Optionally, the second rain grate is obliquely arranged, and one end close to the bridge deck is higher than the other end.

Through adopting above-mentioned technical scheme, when rainfall is too big, and during the rainwater was crossed the bridge surface course, the rainwater got into the header tank through the second water discharge mouth, and great debris is blocked by the second rainwater comb to slide to steel case roof beam bridge below along the second rainwater comb of slope, makes debris be difficult for blockking up the second rainwater comb, thereby in making the rainwater in time collect the header tank, and in draining road drainage system through the drain pipe, reduced the probability of second rainwater comb shutoff, be favorable to the quick drainage of bridge.

Optionally, a gap is formed between the lower end of the blocking net and the inner wall of the water collection tank.

Through adopting above-mentioned technical scheme, when rainfall is too big, during the rainwater passes through the bridge surface course, the rainwater passes through the second water discharge mouth and gets into the header tank, great debris is blocked by the second rainwater comb, and slide to steel case roof beam bridge below along the second rainwater comb of slope, make debris be difficult for blockking up the second rainwater comb, rainwater in the header tank is discharged into road drainage system through the drain pipe, at this moment, enter into debris in the header tank from the second rainwater comb, can fall down along the block net of slope, fall into the dust collection box of below from the breach department, thereby make debris be difficult for blockking up the filter screen, be favorable to the quick drainage of bridge.

In summary, the present utility model includes at least one of the following beneficial technical effects:

1. After sundries enter the water collecting tank through the water drain pipe, heavier sundries are deposited at the bottom, lighter sundries rise along with the rising of the water level, the blocking net further blocks the sundries with larger volume, a certain amount of silt, fragments and other sundries are limited below the blocking net through the setting of the blocking net, the probability of sundries entering a pipeline is reduced, the probability of pipeline blockage is reduced, the labor intensity of pipeline overhaul is reduced, and the quick drainage of bridges is facilitated.

2. After rainfall is stopped, a worker can check the collection condition of sundries in the dust box by opening the overhaul valve, if fewer sundries are collected, the worker can directly clean the sundries at the bottom of the dust box through the overhaul valve, and then the overhaul valve is closed; if the sundries collected are more, the worker can detach the dust box, so that the dust box is cleaned, then the dust box is installed and reset, and the dust box and the maintenance valve are arranged, so that the condition inside the dust box can be observed more intuitively and accurately through the maintenance valve, the cleaning convenience is improved, and the labor intensity is reduced.

3. When rainfall is too big, during the rainwater overflowed the bridge surface course, the rainwater gets into the header tank through the second water outlet to in the road drainage system is discharged into through the drain pipe, through the setting of second water outlet, accelerated the discharge rate of rainwater, be favorable to the quick, the effective drainage of bridge, simultaneously, make a certain amount of rainwater be difficult for discharging into steel case girder bridge below through the mode of scattering, reduced the potential safety hazard that causes pedestrian and vehicle, reduced the probability of road surface ponding, make the drainage more convenient and humanized.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present utility model;

FIG. 2 is an enlarged view of portion A of FIG. 1;

fig. 3 is a schematic side view of an embodiment of the present utility model.

Reference numerals: 1. a steel box girder; 2. a bridge surface layer; 21. a water draining structure; 211. a first drain port; 212. a first rain grate; 3. a drainage assembly; 31. a drain pipe; 32. a water collection tank; 321. a water outlet; 322. a second drain port; 323. a second rain grate; 33. a drain pipe; 34. a blocking net; 35. a filter screen; 36. a drain trap; 4. a dust collection assembly; 41. a dust collection box; 42. and (5) a maintenance valve.

Detailed Description

The utility model is described in further detail below in connection with fig. 1-3.

The embodiment of the utility model discloses a drainage structure of a steel box girder bridge, which comprises a steel box girder 1, a drainage component 3 and a dust collecting component 4 which are arranged on the steel box girder 1, wherein a bridge surface layer 2 is poured on the steel box girder 1, a plurality of drainage structures 21 are arranged on the bridge surface layer 2, the drainage structures 21, the drainage component 3 and the dust collecting component 4 are all arranged in the same number, rainwater at the bottom of a transverse slope of the bridge surface layer 2 enters the drainage component 3 through the drainage structures 21, the drainage component 3 collects the rainwater and discharges the rainwater into a road drainage system, and the dust collecting component 4 is used for collecting sundries entering the drainage component 3.

Referring to fig. 1-2, the drainage structure 21 includes a first drainage port 211 and a first rain grate 212, the first drainage port 211 is formed at the bottom of the cross slope of the bridge deck layer 2, a plurality of first drainage ports 211 are distributed along the length direction of the bridge deck layer 2, the first rain grate 212 is connected and installed at the first drainage port 211, the drainage assembly 3 is communicated with the first drainage port 211, the drainage assembly 3 collects and discharges the rainwater at the bottom of the cross slope of the bridge deck layer 2 into the road drainage system through the first drainage port 211, and the dust collection assembly 4 is used for collecting sundries such as mud dust, fragments and the like entering the drainage assembly 3.

In the early stage of rainfall, a large amount of mud dust, fragments and other sundries on the bridge deck layer 2 are carried by rainwater, the sundries are collected at the slope bottom along a transverse slope, the larger sundries are blocked by the first rainwater grate 212, the rainwater and the sundries which are not blocked enter the first water drain port 211 through the first rainwater grate 212 and are collected into the drainage assembly 3 through the first water drain port 211, a certain amount of sundries enter the dust collection assembly 4 to be deposited, and the rainwater is discharged into a road drainage system.

Referring to fig. 1-3, the drainage assembly 3 includes a drain pipe 31, a water collecting tank 32, a drain pipe 33, a blocking net 34, a filter screen 35 and a drain elbow 36, wherein the water collecting tank 32 is fixedly connected to one end of the steel box girder 1, which is far away from the bridge deck layer 2, through bolts, the drain pipe 31 is obliquely embedded in the bridge deck layer 2, one end of the drain pipe 31 is communicated with the first drain port 211, the other end is communicated with the water collecting tank 32, and one end of the drain pipe 31, which is close to the first drain port 211, is higher than the other end; a water outlet 321 is formed in the upper end of the water collecting tank 32, the filter screen 35 is connected and installed at the water outlet 321, a water drain elbow 36 is fixedly connected to the water collecting tank 32, one end of the water drain elbow 36 is communicated with the water outlet 321, the other end of the water drain elbow 36 is communicated with a water drain pipe 33, one end, close to the water outlet 321, of the water drain elbow 36 is higher than the other end, and the other end of the water drain pipe 33 is communicated with a road water drain system; the two blocking nets 34 are arranged, the blocking nets 34 are obliquely arranged in the water collecting tank 32, one end of each blocking net 34, which is close to the water collecting tank 32, is higher than the other end of each blocking net, one end of each drain pipe 31, which is close to the water collecting tank 32, is located below the blocking net 34, and the drain outlet 321 is located above the blocking net 34.

In the early stage of rainfall, a large amount of mud dust, fragments and other impurities on the bridge deck layer 2 are carried by rainwater, the large impurities are collected at the slope bottom along a transverse slope, the large impurities are blocked by the first rainwater grate 212, the rainwater and the impurities which are not blocked enter the drain pipe 31 through the first drain port 211 and enter the water collecting tank 32 along the drain pipe 31, the heavy impurities are deposited at the bottom of the water collecting tank 32 and enter the dust collecting assembly 4, the light impurities rise along with the rising of the water level, the blocking net 34 further blocks the large impurities, and the impurities rise along the blocking net 34 and are accumulated between the blocking net 34 and the inner wall of the water collecting tank 32 due to the inclined arrangement of the blocking net 34, so that the blocking net 34 is not easy to be blocked by the impurities; when the height of the rainwater in the water collecting tank 32 reaches the water outlet 321, the filter screen 35 further filters impurities in the rainwater, the filtered rainwater is discharged into a road drainage system along the drainage elbow 36 and the drainage pipe 33, and the drainage elbow 36 which is obliquely arranged ensures that impurities such as mud and dust are not easy to accumulate in a pipeline, so that the probability of pipeline blockage is reduced; after the rainfall stops, the worker cleans sundries in the dust collection assembly 4; by the arrangement, a certain amount of sundries are limited below the blocking net 34, the probability of the sundries entering the pipeline is reduced, the probability of pipeline blockage is reduced, the labor intensity of pipeline overhaul is reduced, and the quick drainage of the bridge is facilitated.

Referring to fig. 2-3, the dust collection assembly 4 includes a dust collection tank 41 and an inspection valve 42, the dust collection tank 41 is detachably connected to the bottom of the water collection tank 32, the outer wall of one side of the dust collection tank 41 protrudes from the outer wall of the water collection tank 32, and the inspection valve 42 is connected to the upper surface of one end of the dust collection tank 41 protruding from the water collection tank 32, and forms a slope with the inner wall of the other side of the dust collection tank 41 protruding from the water collection tank 32.

Heavier sundries in the water collecting tank 32 are deposited downwards and slide to the bottom of the dust collecting tank 41 along the slope of the inner wall of the dust collecting tank 41, so that the sundries are not easy to accumulate at one end of the dust collecting tank 41 away from the maintenance valve 42, after rainfall stops, a worker can check the collection condition of the sundries in the dust collecting tank 41 by opening the maintenance valve 42, if fewer sundries are collected, the worker can directly clean the sundries at the bottom of the dust collecting tank 41 through the maintenance valve 42, and then the maintenance valve 42 is closed; if more sundries are collected, a worker can detach the dust box 41, so that the interior of the dust box 41 is cleaned, and then the dust box 41 is installed and reset; by the arrangement, the condition inside the dust box 41 can be observed more intuitively and accurately through the overhaul valve 42, the cleaning convenience is improved, and the labor intensity is reduced.

Referring to fig. 2-3, a second drain port 322 is provided at the upper end of the water collection tank 32, a second rain grate 323 is installed at the second drain port 322 in a connecting manner, the second rain grate 323 is obliquely arranged, one end close to the bridge deck 2 is higher than the other end, and a gap is formed between the lower ends of the two blocking nets 34 and the inner wall of the water collection tank 32.

When the rainfall is too large, rainwater flows through the bridge surface layer 2, the rainwater enters the water collecting tank 32 through the second water drain port 322, larger sundries are blocked by the second rainwater grate 323 and slide below the steel box girder 1 bridge along the inclined second rainwater grate 323, so that the second rainwater grate 323 is not easy to be blocked by sundries, the rainwater in the water collecting tank 32 is discharged into a road drainage system through the drain pipe 33, at the moment, the sundries entering the water collecting tank 32 from the second rainwater grate 323 can slide downwards along the inclined blocking net 34 and fall into the dust collecting tank 41 below the notch, so that the sundries are not easy to block the filter screen 35, the arrangement is accelerated, the quick drainage of the bridge is facilitated, meanwhile, a certain amount of rainwater is not easy to drain below the steel box girder 1 bridge in a scattered drainage mode, the potential safety hazard to pedestrians and vehicles is reduced, the probability of road surface ponding is reduced, and drainage is more convenient and humanized.

The implementation principle of the drainage structure of the steel box girder bridge provided by the embodiment of the utility model is as follows:

In the early stage of rainfall, the rainwater is carried with a large amount of mud dust and fragments and other sundries on the bridge deck layer 2, the sundries are collected at the slope bottom along a transverse slope, the larger sundries are blocked by the first rainwater grate 212, the rainwater and the sundries which are not blocked enter the drain pipe 31 through the first drain port 211 and enter the water collecting tank 32 along the drain pipe 31, the heavier sundries are deposited downwards and slide to the bottom of the dust collecting tank 41 along the slope surface of the inner wall of the dust collecting tank 41, when the height of the rainwater in the water collecting tank 32 reaches the water outlet 321, the rainwater enters the drain elbow 36 from the water outlet 321, the filter screen 35 further blocks the sundries in the rainwater, the rainwater is discharged into a road drainage system along the drain elbow 36 and the drain pipe 33, and the drain elbow 36 which is obliquely arranged ensures that the small-sized sundries such as mud dust are not easy to accumulate in a pipeline and further blocks the pipeline;

When more rainwater accumulates in the water collection tank 32, lighter sundries rise along with the rising of the water level, such as foam, plastic and the like, the blocking net 34 further blocks the sundries with larger volume, and as the blocking net 34 is obliquely arranged, the sundries rise along the blocking net 34 and are accumulated between the blocking net 34 and the inner wall of the water collection tank 32, so that the blocking net 34 is not easy to be blocked by the sundries, and meanwhile, gaps are formed between the lower ends of the two blocking nets 34 and the inner wall of the water collection tank 32, so that the rainwater can flow upwards from the gaps;

When the rainfall is too large, rainwater flows through the bridge surface layer 2, the rainwater enters the water collecting tank 32 through the second water drain port 322, larger sundries are blocked by the second rainwater grate 323 and slide down the bridge of the steel box girder 1 along the inclined second rainwater grate 323, so that the sundries are not easy to block the second rainwater grate 323, the rainwater is timely collected in the water collecting tank 32 and is discharged into a road drainage system through the drain pipe 33, at the moment, the sundries entering the water collecting tank 32 from the second rainwater grate 323 can slide down along the inclined blocking net 34 and fall into the dust collecting tank 41 below from the gap, and the filter screen 35 is not easy to be blocked by the sundries; so set up for the drainage rate of rainwater, simultaneously, make the difficult mode of arranging in bulk into steel case roof beam 1 bridge below of a certain amount of rainwater, reduced the potential safety hazard that causes pedestrian and vehicle, reduced the probability of road surface ponding, make the drainage more convenient and humanized.

After the rainfall stops, a worker can check the collection condition of sundries in the dust box 41 by opening the overhaul valve 42, if fewer sundries are collected, the worker can directly clean the sundries at the bottom of the dust box 41 through the overhaul valve 42, and then the overhaul valve 42 is closed; if the collected impurities are more, the worker can detach the dust box 41 to clean the inside of the dust box 41, and then install and reset the dust box 41.

The above embodiments are not intended to limit the scope of the present utility model, so: all equivalent changes in structure, shape and principle of the utility model should be covered in the scope of protection of the utility model.

Claims (10)

1. The utility model provides a drainage structures of steel case roof beam bridge, includes steel case roof beam (1) and sets up drainage subassembly (3) on steel case roof beam (1), pour deck layer (2) on steel case roof beam (1), a plurality of first water discharge openings (211) have been seted up along length direction to the horizontal slope bottom on deck layer (2), and a plurality of first water discharge openings (211) department is provided with first rainwater grate (212) that quantity is the same, drainage subassembly (3) include water discharge pipe (31), header tank (32) and drain pipe (33), water collection tank (32) set up in the one end that bridge surface layer (2) was kept away from to steel case roof beam (1), water discharge pipe (31) slope sets up in deck layer (2), water discharge pipe (31) one end intercommunication first water discharge opening (211), other end intercommunication water collection tank (32), water discharge pipe (31) are close to the one end of first water discharge opening (211) is higher than the other end, water discharge opening (321) have been seted up on water collection tank (32), one end (33) intercommunication drainage system, characterized in that:

The drainage assembly (3) further comprises a blocking net (34) arranged in the water collecting tank (32), one end, close to the water collecting tank (32), of the drainage pipe (31) is located below the blocking net (34), and the drainage outlet (321) is located above the blocking net (34).

2. A drainage structure of a steel box girder bridge according to claim 1, wherein: the blocking net (34) is obliquely arranged, and one end of the blocking net (34) close to the drain pipe (31) is higher than the other end.

3. A drainage structure of a steel box girder bridge according to claim 1, wherein: the drainage assembly (3) further comprises a filter screen (35), and the filter screen (35) is arranged at the drainage port (321).

4. A drainage structure of a steel box girder bridge according to claim 1, wherein: the drainage assembly (3) further comprises a drainage elbow (36), one end of the drainage elbow (36) is communicated with the drainage outlet (321), the other end of the drainage elbow is communicated with the drainage pipe (33), and one end, close to the drainage outlet (321), of the drainage elbow (36) is higher than the other end of the drainage elbow.

5. A drainage structure of a steel box girder bridge according to claim 1, wherein: still be provided with dust collection subassembly (4) on steel case roof beam (1), dust collection subassembly (4) are including dust collection box (41), dust collection box (41) detachable connection is in the bottom of header tank (32).

6. The drainage structure of a steel box girder bridge according to claim 5, wherein: the outer wall of dust collection box (41) one side protrusion is in the outer wall of header tank (32), dust collection subassembly (4) still include maintenance valve (42), maintenance valve (42) set up in dust collection box (41) protrusion in the upper surface of header tank (32) one end.

7. The drainage structure of a steel box girder bridge according to claim 6, wherein: the inner wall of the other side opposite to the side of the dust collection box (41) protruding from the water collection box (32) forms a slope.

8. A drainage structure of a steel box girder bridge according to any one of claims 1 to 7, wherein: the upper end of the water collecting tank (32) is provided with a second water drain port (322), and a second rainwater grate (323) is arranged at the second water drain port (322).

9. The drainage structure of a steel box girder bridge according to claim 8, wherein: the second rain grate (323) is obliquely arranged, and one end close to the bridge surface layer (2) is higher than the other end.

10. The drainage structure of a steel box girder bridge according to claim 8, wherein: a gap is formed between the lower end of the blocking net (34) and the inner wall of the water collecting tank (32).