Bridge flange plate lower pedestrian path structure and construction method

Abstract

The invention provides a pedestrian path structure below a flange plate of a bridge. A pedestrian path is arranged by utilizing a lower space of the flange plate of a bridge structure. The pedestrian path structure under the bridge flange plate comprises an embedded structure, a path supporting structure and a path bridge floor structure. The multiple channel supporting structures are arranged on the lower portion of a bridge at intervals in the longitudinal direction of the beam bridge. The channel supporting structure is connected with the bridge through an embedded structure arranged on the beam bridge. Each channel supporting structure is provided with a cantilever end extending to the position below a corresponding side flange plate of the bridge in the transverse direction, and a channel bridge floor structure is arranged between the cantilever ends of the adjacent channel supporting structures, so that a pedestrian path is formed below the flange plate of the bridge; and the pedestrian path is communicated with a sidewalk below the beam bridge through stairs.

Description

Technical Field

[0001] The present invention relates to a pedestrian passage structure and a construction method, and particularly to a pedestrian passage structure and a construction method under the bridge flange plate, belonging to the technical field of municipal traffic construction engineering. Background Art

[0002] With the continuous advancement of the urbanization process, the municipal traffic construction has been greatly developed, and an aerial three-dimensional traffic network has gradually taken shape. Among them, the overpass is a facility that crosses the road in an overlying manner, usually set at the locations where vehicles cross expressways and first-class highways, especially in places where traffic flow conflicts are more serious. In addition, in order to facilitate the safe travel of citizens and improve the ground traffic efficiency, pedestrian overpasses are also considered to be added in some areas with large vehicle flows, dense pedestrians, or intersections, squares, and above railways.

[0003] At present, in some areas where pedestrian overpasses need to be set up, the surrounding overpasses are generally utilized. When designing the overpass structure, the width of the upper bridge structure is considered to be increased in advance, and separate sidewalks are set for pedestrians on both sides of the bridge deck; for some municipal expressways, rail transit viaducts, etc. where it is not suitable to set sidewalks on the bridge deck, a new pedestrian overpass will be built beside. When a sidewalk needs to be set on the overpass, the width of the upper bridge structure will increase, resulting in a higher cost, and there are also certain risks for pedestrians and motor vehicles to travel side by side. At the same time, it will also limit the maximum driving speed of motor vehicles. However, when adopting the method of building a new pedestrian overpass, obviously more costs need to be invested. Summary of the Invention

[0004] In view of this, the present invention provides a pedestrian passage structure under the bridge flange plate. By utilizing the lower space of the flange plate of the bridge structure to set up a pedestrian passage, not only can the width of the bridge structure be further reduced, the cost be reduced, but also the way of separating the sidewalk from the motor vehicle lane can effectively reduce the driving risk; in addition, for places where it is not suitable to set sidewalks on the bridge deck, a pedestrian passage can be set by utilizing the lower space of the flange plate of the bridge structure, and there is no need to build a new pedestrian overpass.

[0005] The technical solution of the present invention is: a pedestrian passage structure under the bridge flange plate, comprising: a pre-embedded structure, a passage support structure, and a passage bridge deck structure;

[0006] A plurality of the passage support structures are arranged at intervals along the longitudinal direction of the beam bridge under the bridge;

[0007] The passage support structure is connected to the bridge through a pre-embedded structure arranged on the beam bridge;

[0008] The channel support structure has a cantilever end that extends laterally under the corresponding wing flange of the bridge. A channel deck structure is provided between the cantilever ends of adjacent channel support structures, thereby forming a pedestrian passage under the wing flange of the bridge;

[0009] The pedestrian passage is connected to the sidewalk under the beam bridge through a staircase.

[0010] As a preferred embodiment of the present invention, the channel support structure is an integral precast member, including: a main cross beam, a suspension beam, an inclined beam, and a support plate;

[0011] The main cross beam is horizontally arranged laterally. One end extends under the wing flange to form a cantilever beam of the channel support structure, and the other end is provided with a suspension beam and an inclined beam; end plates A and B are respectively provided on the suspension beam and the inclined beam for fixed connection with the embedded structure. After connection, the suspension beam and the inclined beam form a triangular support structure;

[0012] Support plates are provided on both sides in the width direction of the main cross beam. The support plates extend along the length direction of the main cross beam for supporting the channel deck structure; below the support plates, a plurality of rib plates B are arranged at intervals along the length direction of the support plates.

[0013] As a preferred embodiment of the present invention, the main cross beam has a box-shaped cross section. A lifting lug is provided at the upper part of the end of its cantilever, and a lifting hole is provided on the lifting lug for connecting a steel cable;

[0014] The upper end of the steel cable is connected to the anchor plate on the upper side of the end of the wing flange. Prestress is applied to the steel cable through the anchor plate to tension the cantilever end of the main cross beam.

[0015] As a preferred embodiment of the present invention, baffles are provided on both sides of the upper part of the connection end of the main cross beam and the suspension beam.

[0016] As a preferred embodiment of the present invention, a rib plate A is provided at the connection of the main cross beam and the suspension beam.

[0017] As a preferred embodiment of the present invention, the embedded unit includes: an embedded steel plate, embedded steel bars, and a sleeve;

[0018] The embedded steel bars are located inside the bridge and are connected to the embedded steel plate on the lower end face of the bridge by a sleeve. The sleeve is provided with internal threads, and the lower end of the embedded steel bar is provided with external threads. The embedded steel bar and the sleeve are fixedly connected by threads; the sleeve is welded to the embedded steel plate;

[0019] A reserved hole communicating with the internal threaded hole of the sleeve is provided at the connection position of the embedded steel plate and the sleeve, corresponding to the reserved hole on the end plate A or end plate B. The end plate A and end plate B are fixedly connected to the embedded structure through bolts that cooperate with the reserved holes.

[0020] As a preferred embodiment of the present invention: The channel bridge deck structure includes: a bridge deck, a bridge deck pavement, angle steel, and a railing;

[0021] The bridge deck is a precast member and is supported on two adjacent channel support structures;

[0022] The upper surface of the bridge deck is provided with a bridge deck pavement, and angle steel and railings are provided on both lateral sides. The vertical side of the angle steel is closely arranged against the bridge deck and plays a limiting role for the bridge deck. The two ends of the horizontal side are placed on the channel support structure and are bolted to the channel support structure; holes are provided on the horizontal side of the angle steel for installing the railing.

[0023] As a preferred embodiment of the present invention: The bridge is a box girder bridge, and the box girder bridge includes a box girder and piers supporting the box girder;

[0024] The box girder includes: a top plate, a bottom plate, webs on both lateral sides, and flange plates on both lateral sides.

[0025] As a preferred embodiment of the present invention: The embedded structure is divided into two parts, namely an embedded unit provided on the web and an embedded unit provided on the bottom plate.

[0026] In addition, the present invention provides a construction method for the pedestrian passage structure under the flange plate of the above bridge. First, the embedded structure is pre-embedded in the beam bridge in advance; the production and installation of the precast members in the channel support structure and the channel bridge deck structure are completed in the component factory, and they are inspected. After passing the inspection, they are transported to the installation site for standby; and a pull-out test is carried out on the embedded structure in the beam bridge to make it meet the set requirements;

[0027] During construction, the channel support structure is hoisted under the flange plate and fixedly connected to the embedded structure; after all the channel support structures are installed, the channel bridge deck structure is sequentially placed between the channel support structures along the longitudinal direction; finally, the stairs are constructed to connect the stairs with the pedestrian passage structure.

[0028] Beneficial effects:

[0029] (1) In the present invention, the pedestrian passage structure is under the flange plate of the bridge, which can make the carriageway on the bridge and the pedestrian passage structure not affect each other. Compared with the current overpass with the carriageway and the sidewalk set in the same plane space, it can reduce the occurrence of traffic accidents and ensure the safety of pedestrians. At the same time, for some municipal expressways, rail transit viaducts, etc. where it is not suitable to set sidewalks on the bridge deck, the lower space of the flange plate can also be used to set the pedestrian passage structure, without the need to build a new pedestrian overpass, which can effectively reduce the investment.

[0030] (2) The present invention adopts prefabricated components and fully considers lightweight design. After being processed in the factory, the components can be directly transported to the site for installation, with small installation difficulty, high efficiency and little impact on the traffic of existing roads.

[0031] (3) In the present invention, a steel cable is connected to the cantilever end of the main cross beam of the channel support structure. The upper end of the steel cable is connected to the anchor plate on the upper side of the end of the flange plate. Through the anchor plate, a certain prestress can be applied to the steel cable, so that the cantilever end of the main cross beam can be tightened. While improving the stability of the channel support structure, the stress of the support structure can be optimized, and the original cantilever stress state can be improved to a two-point simply supported state, which can meet the lightweight design requirements of the support structure and is beneficial to cost control.

[0032] (4) In the present invention, the channel support structure is respectively connected to the embedded structure through the hanging beam and the inclined beam. The hanging beam and the inclined beam form a stable triangular support structure, making the channel support structure more stable.

[0033] (5) In the present invention, through the setting of the sleeve in the embedded structure, while meeting the connection between the embedded steel bar and the embedded steel plate, the rapid connection between the embedded steel plate and the end plate can be completed by using bolts, realizing the rapid installation of the channel support structure.

[0034] (6) In the present invention, the damage problem of the components occurring in the later operation can be quickly processed by replacing the components, which is beneficial to reducing the difficulty of later maintenance and the maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a three-dimensional structure schematic diagram of the pedestrian passage structure under the flange plate of the box girder bridge of the present invention;

[0036] Figure 2 is Figure 1 the enlarged schematic diagram of Node A in

[0037] Figure 3 is a cross-sectional view of the pedestrian passage under the flange plate of the bridge of the present invention;

[0038] Figure 4 is Figure 3 the enlarged schematic diagram of Node B in

[0039] Figure 5 is a three-dimensional view of the pedestrian passage support structure;

[0040] Figure 6 is a cross-sectional view of the pedestrian passage support structure;

[0041] Figure 7 is a large-scale drawing of the embedded structure;

[0042] Figure 8 is a large-scale drawing of the pedestrian passage bridge deck structure.

[0043] Among them: 1 - carriageway; 2 - sidewalk; 3 - stair pier; 4 - stairs; 5 - pier; 6 - box girder; 7 - top plate; 8 - bottom plate; 9 - web; 10 - flange plate; 11 - anti-collision pier; 12 - embedded steel bar; 13 - sleeve; 14 - embedded steel plate; 20 - pedestrian passage; 21 - bridge deck; 22 - bridge deck pavement; 23 - angle steel; 24 - railing; 25 - main cross beam; 26 - hanging beam; 27 - skew beam; 28 - end plate A; 29 - end plate B; 30 - reserved hole; 31 - baffle; 32 - rib plate A; 33 - lifting lug; 34 - support plate; 35 - rib plate B; 36 - steel cable; 37 - anchor plate. Specific implementation manner

[0044] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0045] Embodiment 1:

[0046] This embodiment provides a pedestrian passage structure under the flange plate of a bridge. The pedestrian passage structure is under the flange plate of the bridge, and the carriageway and the sidewalk do not affect each other. Compared with the current overpass with the carriageway and the sidewalk arranged in the same plane space, the traffic efficiency can be improved, and at the same time, the occurrence of traffic accidents can be reduced to ensure the safety of pedestrians.

[0047] For the convenience of description, let the longitudinal direction be along the line direction of the bridge central axis.

[0048] The bridge in this example is a box girder bridge. As Figures 1 - 4 shown, the box girder bridge mainly includes a box girder 6 and piers 5 supporting the box girder 6; among them, there are multiple carriageways on the upper part of the box girder 6 as the upper-layer carriageway, and anti-collision piers 11 are arranged on both lateral sides of the box girder 6 in the transverse direction. The box girder 6 is generally of a box structure, including: a top plate 7, a bottom plate 8, webs 9 on both lateral sides in the transverse direction, and flange plates 10 on both lateral sides in the transverse direction. There is a hollow box chamber inside. By arranging multiple hollow box chambers transversely, a double-chamber box girder and a multi-chamber box girder can be formed; the box girder shown in this case is a double-chamber box girder. The box girder 6 is placed on the pier 5, and the box girder 6 can span multiple carriageways 1 (as the lower-layer carriageway) on the municipal road, so that the vehicles on the upper and lower roads can pass independently. The pier 5 is arranged under the box girder 6 to transfer the self-weight and upper load of the box girder 6 to the lower foundation; in order to avoid affecting the lower-layer carriageway, the pier 5 is generally arranged in the central isolation belt or on the sidewalks 2 on both sides of the lower-layer carriageway. The shape of the pier 5 is generally large at the upper end and small at the lower end, similar to a vase pier, and the width of the upper part of the pier 5 is smaller than the width of the bottom plate 8 in the box girder 6.

[0049] The pedestrian passage structure under the flange plate of the box girder bridge includes: a pre-embedded structure, a passage support structure, and a passage deck structure; among them, the pre-embedded structure is arranged at the lower part of the box girder bridge (multiple pre-embedded structures can be arranged longitudinally); the passage support structures correspond one by one to the pre-embedded structures and are connected to the corresponding pre-embedded structures at the lower part of the box girder bridge; the passage support structure has a cantilever end extending transversely to the lower part of the corresponding wing flange plate 10, and a passage deck structure is arranged between the cantilever ends of adjacent passage support structures. The paving layer and guardrail arranged in the passage deck structure form a pedestrian passage 20 for pedestrians to walk on.

[0050] Generally, multiple passage support structures will be arranged longitudinally along the bridge at the lower part of the box girder 6. The passage deck structure is arranged between the passage support structures. The specific number and arrangement of the passage support structures can be flexibly adjusted according to the site. Under the condition of meeting the structural stress requirements, the span of the passage deck structure can be increased as much as possible, and the number of passage support structures can be reduced.

[0051] The above-mentioned pedestrian passage structure can be arranged under the wing flange plates 10 on both transverse sides of the box girder bridge.

[0052] In this solution, a pedestrian passage 20 is arranged longitudinally under the wing flange plate 10 of the box girder 6 for the convenience of pedestrians to pass; in addition, a staircase 4 is provided for connecting the lower sidewalk 2 and the upper pedestrian passage 20. In this example, staircases 4 are arranged at both longitudinal ends of the pedestrian passage 20 (more than two staircases 4 can also be arranged). The upper side of the staircase 4 is connected to the pedestrian passage 20, and the lower side is arranged on the sidewalk 2. A staircase pier 3 is arranged under the middle part of the staircase 4. By setting the staircase 4, pedestrians can be introduced into the pedestrian passage structure, and finally, the pedestrian passage structure under the wing flange plate 10 is used to realize the function of crossing the street (that is, transversely crossing the lower sidewalk 1).

[0053] Therefore, for the box girder bridge, the upper part of the box girder 6 is the upper vehicle lane, and the lower part is the pedestrian passage 20, and the two do not affect each other. Compared with the current overpass with the vehicle lane and the sidewalk set in the same plane space, the upper limit of the motor vehicle speed limit can be increased, the traffic efficiency can be greatly improved, and at the same time, the occurrence of traffic accidents can be reduced to ensure the safety of pedestrians. In addition, for some municipal expressways, rail transit viaducts and other places where it is not suitable to set sidewalks on the bridge deck, by setting the pedestrian passage 20 under the wing flange plate 10, there is no need to build a new pedestrian overpass, which can effectively reduce the investment.

[0054] Embodiment 2:

[0055] On the basis of the above Embodiment 1, this embodiment respectively gives a preferred structural form of the pre-embedded structure, the passage support structure, and the passage deck structure.

[0056] Such as Figures 4 - 6As shown, the channel support structure is an integral precast member, including: main cross beam 25, hanging beam 26, inclined beam 27, lifting lug 33 and support plate 34; among them, the main cross beam 25 is horizontally arranged transversely, with one end extending outward relative to the box girder 6 to form a cantilever beam of the channel support structure, and the other end is provided with a hanging beam 26 and an inclined beam 27; end plates A 28 and end plates B 29 are respectively arranged on the hanging beam 26 and the inclined beam 27, and both are connected by welding; reserved holes 30 are arranged on both the end plates A 28 and the end plates B 29 for fixed connection with the embedded structure, so as to quickly fix the channel support structure under the box girder 6.

[0057] The inclined beam 27 is inclined, with its lower end welded to the side of the hanging beam 26, and the upper end is provided with an end plate B 29; the angle of the inclined beam 27 should be determined according to the design. The setting of the inclined beam 27 can limit and support the hanging beam 26, which is beneficial to ensuring the overall stability of the channel support structure. The hanging beam 26 is vertically arranged. As the main load-bearing structure, it bears the self-weight and upper loads of the pedestrian passage 20 and transfers them to the box girder 6. The length of the hanging beam 26 can be flexibly set according to the net height requirements of the pedestrian passage, that is, when the height of the web 9 is small and the net height of the pedestrian passage 20 under the flange plate 10 is insufficient, the length of the hanging beam 26 can be increased to make the height of the pedestrian passage 20 meet the requirements, and vice versa, the length of the hanging beam 26 can be appropriately reduced. The main cross beam 25 is arranged outside the hanging beam 26 and is welded to it; at the same time, a rib plate A 32 is welded to both of them to improve the connection strength between the two.

[0058] The main cross beam 25 has a box-shaped cross-section. A lifting lug 33 is arranged on the upper part of the end of its cantilever, and a lifting hole is arranged on the lifting lug 33 for connecting the steel cable 36. The upper end of the steel cable 36 is connected to the anchor plate 37 on the upper side of the end of the flange plate 10 of the box girder 6. A certain prestress can be applied to the steel cable 36 through the anchor plate 37, so as to tighten the cantilever end of the main cross beam 25. While improving the stability of the channel support structure, the stress of the support structure can be optimized, and the original cantilever stress state can be improved to a two-point simply supported state, which can meet the lightweight design requirements of the support structure and is beneficial to cost control.

[0059] In addition, support plates 34 and rib plates B 35 are arranged on both sides in the width direction of the main cross beam 25. Among them, the support plates 34 are welded in the middle of both side surfaces in the width direction of the main cross beam 25 and extend along the length direction of the main cross beam 25; the reserved height of the upper part of the support plates 34 is the same as the thickness of the deck slab 21 in the channel bridge deck structure. The rib plates B 35 are arranged below the support plates 34, and a plurality of rib plates B 35 are arranged at intervals along the length direction of the support plates 34; the rib plates B 35 are mainly used to improve the support strength of the support plates 34. In addition, baffles 31 are arranged on both upper sides of the connection end of the main cross beam 25 and the hanging beam 26 to limit the bridge deck paving 22 in the subsequent channel bridge deck structure.

[0060] As Figure 7As shown in the figure, the embedded structure is divided into two parts, namely the embedded unit arranged on the web 9 of the box girder 6 and the embedded unit arranged on the bottom plate 8 of the box girder 6; the structures of the two embedded units are the same, only the sizes are different. The hanging beam 26 is connected to the embedded unit arranged on the web 9 of the box girder 6 through the end plate A28, and the inclined beam 27 is connected to the embedded unit arranged on the bottom plate 8 of the box girder 6 through the end plate B29.

[0061] The embedded unit includes: an embedded steel plate 14, embedded steel bars 12 and a sleeve 13; the embedded steel plate 14 arranged below the web 9 is defined as the embedded steel plate A, and the embedded steel plate 14 arranged below the bottom plate 8 is defined as the embedded steel plate B; considering that the web 9 is a vertically arranged wall, generally the embedded steel bars 12 on the embedded steel plate A are longer. The embedded steel bars 12 and the embedded steel plate 14 are connected by the sleeve 13, wherein the sleeve 13 is provided with internal threads, and the lower end of the embedded steel bar 12 is provided with external threads, so the embedded steel bar 12 and the sleeve 13 can be fixedly connected by threads, and the sleeve 13 is connected to the embedded steel plate by welding; a reserved hole communicating with the internal thread hole of the sleeve 13 is arranged at the connection position of the embedded steel plate 14 and the sleeve 13, corresponding to the reserved holes 30 on the end plate A28 and the end plate B29 (that is, the center of the reserved hole 30 is aligned with the center position of the sleeve 13), and the connection between the end plate A28 and the embedded steel plate A and the connection between the end plate B29 and the embedded steel plate B are realized through bolts matching with the reserved holes; thus, the channel support structure can be quickly fixed under the box girder 6.

[0062] The end of the embedded steel bar 12 does not need to extend too deep into the sleeve 13 to prevent the lower bolt from not being able to be screwed into the sleeve 13; the embedded steel plate A on the web 9 will be connected to the hanging beam 26 through the end plate A28, and the embedded steel plate B on the bottom plate 8 is connected to the end plate B29 on the inclined beam 27, so that a stable triangular support structure can be formed between the hanging beam 26 and the inclined beam 27, making the channel support structure more stable. Through the setting of the sleeve 13, while meeting the connection between the embedded steel bar 12 and the embedded steel plate 14, the quick connection between the embedded steel plate 14 and the end plate (end plate A28 or end plate B29) can be completed by bolts, realizing the quick installation of the channel support structure.

[0063] As Figure 8As shown in the figure, the channel bridge deck structure includes: a bridge deck 21, a bridge deck pavement 22, angle steel 23 and a railing 24; among them, the bridge deck 21 is a factory prefabricated component, supported on the support plate 34 between two adjacent channel support structures. The bridge deck 21 directly bears the upper load of the pedestrian passage structure and transfers it to the channel support structure. The bridge deck 21 can be made of a steel structure or a steel-concrete composite structure, as long as it can meet the stress requirements under the designed span. The upper surface of the bridge deck 21 is provided with a bridge deck pavement 22, and angle steel 23 and a railing 24 are arranged on both transverse sides. Among them, the vertical side of the angle steel 23 is closely attached to the bridge deck 21 and plays a limiting role for the bridge deck 21. The two ends of the horizontal side are placed on the support plate 34 and are bolted to the support plate 34; holes are provided on the horizontal side of the angle steel 23 for installing the railing 24; the height of the vertical side of the angle steel 23 is greater than the thickness of the bridge deck 21 and is flush with the top of the baffle 31.

[0064] Embodiment 3:

[0065] This embodiment provides the construction method of the pedestrian passage under the wing flange of the box girder bridge in the above Embodiment 1 or Embodiment 2. Let the longitudinal direction be along the line direction of the bridge axis. This method includes the following steps:

[0066] S1: Pre-embed the pre-embedded structure in the box girder 6 in advance, and erect the box girder 6 on the pier 5;

[0067] S2: Complete the fabrication and installation of the channel support structure and the bridge deck 21 in the component factory, and conduct inspections on them. After passing the inspections, transport them to the installation site for standby;

[0068] S3: Conduct a pull-out test on the pre-embedded structure (i.e., the pre-embedded steel plate 14 and the pre-embedded steel bar 12) under the box girder 6. Under the conditions that the pedestrian passage structure can bear its own weight and pedestrian load and other working conditions, ensure that the pre-embedded structure will not be pulled out;

[0069] S4: Hoist the channel support structure under the box girder 6 and fix it to the pre-embedded structure under the box girder 6 through bolts;

[0070] S5: After installing all the channel support structures at the bottom of the box girder 6, install the angle steel 23 longitudinally on the upper part of the support plate 34 of the channel support structure and fix it through bolt connections;

[0071] S6: Use a crane to sequentially place the bridge deck 21 longitudinally on the upper part of the support plate 34 between the channel support structures, and then fix and install the railing 24 on the horizontal side of the angle steel 23;

[0072] S7: Complete the installation of the steel cable 36 by using the lifting lug 33 and the anchor plate 37, and apply a certain prestress to the steel cable 36 through the anchor plate 37;

[0073] S8: Construct the bridge deck paving 22 and complete the decoration of the pedestrian passage structure;

[0074] S9: Construct the staircase 4 and the staircase pier 3, connect the staircase 4 with the pedestrian passage structure, and finally complete the construction of the pedestrian passage structure under the flange plate of the box girder bridge.

[0075] In step S4, the embedded steel plate A in the web 9 is fixedly connected to the end plate A28 by bolts, and the embedded steel plate B in the bottom plate 8 is fixedly connected to the end plate B29 by bolts.

[0076] In step S6, both side surfaces of the bridge deck 21 are closely attached to the vertical sides of the angle steel 23 to prevent the bridge deck 21 from moving.

[0077] In step S7, a certain prestress is applied to the steel cable 36 through the anchor plate 37, which can tighten the cantilever end of the main cross beam 25. While improving the stability of the channel support structure, it can optimize the force of the support structure, achieve the lightweight design of the support structure, and is beneficial to cost control.

[0078] In step S9, the staircase 4 can be partially replaced by a barrier-free elevator to meet the travel needs of disabled people. In addition, multiple staircases 4 can be set to be connected to the pedestrian passage structure, so that pedestrians can easily go to different areas. When connecting, only the railing 24 at the corresponding position of the pedestrian passage structure needs to be removed.

[0079] In this pedestrian passage structure, precast components are mostly used. After being processed in the factory, they can be transported to the site and directly installed. This construction method based on assembled installation can quickly realize the installation of the pedestrian passage structure under the flange plate of the box girder bridge, with little impact on the traffic of the existing road. In addition, if some components are damaged during the later operation, they can be quickly processed by replacing the components, which is beneficial to reducing the difficulty of later maintenance and the maintenance cost.

[0080] Although the present invention has been described in detail above with general descriptions and specific embodiments, based on the present invention, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection required by the present invention.

Claims

1. A pedestrian passage structure under a bridge flange plate, characterized in that: include: Embedded structures, channel support structures and channel bridge deck structures; A plurality of the channel support structures are arranged at intervals along the longitudinal direction of the beam bridge at the lower part of the bridge; The channel support structure is connected to the bridge via a pre-embedded structure arranged on the beam bridge; The channel support structure has a cantilever end extending laterally to below the corresponding side flange plate (10) of the bridge, and a channel deck structure is arranged between the cantilever ends of adjacent channel support structures, thereby forming a pedestrian channel (20) below the bridge flange plate; The pedestrian passage (20) is connected to the sidewalk (2) below the beam bridge via stairs (4).

2. The pedestrian passage structure under the bridge flange plate according to claim 1, characterized in that: The channel support structure is a prefabricated part as a whole, comprising: a main cross beam (25), a hanging beam (26), an inclined beam (27) and a support plate (34); The main cross beam (25) is arranged horizontally, one end of which extends below the flange plate (10) to form a cantilever beam of the channel support structure, and the other end of which is provided with a hanging beam (26) and an inclined beam (27); the hanging beam (26) and the inclined beam (27) are respectively provided with an end plate A (28) and an end plate B (29) for fixed connection with the embedded structure, and after connection, the hanging beam (26) and the inclined beam (27) form a triangular support structure; Support plates (34) are arranged on both sides of the main cross beam (25) in the width direction. The support plates (34) extend along the length direction of the main cross beam (25) and are used to support the channel bridge deck structure. Below the support plates (34), a plurality of ribs B (35) are arranged at intervals along the length direction of the support plates (34).

3. The pedestrian passage structure under the bridge flange plate according to claim 2, characterized in that: The main cross beam (25) is a box-shaped cross section, and a lifting lug (33) is provided on the upper part of the cantilever end. The lifting lug (33) is provided with a lifting hole for connecting a steel cable (36); The upper end of the steel cable (36) is connected to the anchor plate (37) on the upper side of the end of the flange plate (10), and prestress is applied to the steel cable (36) through the anchor plate (37) to tighten the cantilever end of the main beam (25).

4. The pedestrian passage structure under the bridge flange plate according to claim 2 or 3, characterized in that: Baffles (31) are provided on both sides of the upper part of the connection end between the main cross beam (25) and the suspension beam (26).

5. The pedestrian passage structure under the bridge flange plate according to claim 2 or 3, characterized in that: A rib plate A (32) is provided at the connection between the main cross beam (25) and the suspension beam (26).

6. The pedestrian passage structure under the bridge flange plate according to any one of claims 1 to 3, characterized in that: The embedded unit comprises: an embedded steel plate (14), embedded steel bars (12) and a sleeve (13); The embedded steel bar (12) is located inside the bridge and is connected to the embedded steel plate (14) at the lower end of the bridge by a sleeve (13), wherein the sleeve (13) is provided with an internal thread, and the lower end of the embedded steel bar (12) is provided with an external thread, and the embedded steel bar (12) and the sleeve (13) are fixedly connected by threads; the sleeve (13) is welded to the embedded steel plate; A reserved hole connected to the internal threaded hole of the sleeve (13) is provided at the connection position between the embedded steel plate (14) and the sleeve (13), and corresponds to the reserved hole on the end plate A (28) or the end plate B (29). The end plate A (28) and the end plate B (29) are fixedly connected to the embedded structure by bolts matched with the reserved holes.

7. The pedestrian passage structure under the bridge flange plate according to any one of claims 1 to 3, characterized in that: The channel bridge deck structure comprises: a bridge deck (21), a bridge deck pavement (22), angle steel (23) and a railing (24); The bridge deck (21) is a prefabricated part supported on two adjacent channel support structures; The upper surface of the bridge deck (21) is provided with a bridge deck pavement (22), and angle steels (23) and railings (24) are provided on both lateral sides, wherein the vertical edge of the angle steel (23) is arranged close to the bridge deck (21) and serves to limit the bridge deck (21), and the two ends of the horizontal edge are placed on the channel support structure and connected to the channel support structure by bolts; holes are provided on the horizontal edge of the angle steel (23) for installing the railings (24).

8. The pedestrian passage structure under the bridge flange plate according to any one of claims 1 to 3, characterized in that: The bridge is a box-beam bridge, comprising a box beam (6) and a pier (5) supporting the box beam (6); The box beam (6) comprises: a top plate (7), a bottom plate (8), web plates (9) on both sides of the transverse direction, and flange plates (10) on both sides of the transverse direction.

9. The pedestrian passage structure under the bridge flange plate according to claim 8, characterized in that: The embedded structure is divided into two parts, namely an embedded unit arranged on the web (9) and an embedded unit arranged on the bottom plate (8).

10. A construction method for a pedestrian passage structure under a bridge flange plate, characterized in that: The pedestrian passage structure is the pedestrian passage structure according to any one of claims 1 to 9 above: First, the embedded structure is embedded in the beam bridge in advance; the prefabricated parts in the channel support structure and the channel bridge deck structure are manufactured and installed in the component factory, and tested. After passing the test, they are transported to the installation site for standby; and the embedded structure in the beam bridge is subjected to a pull-out test to ensure that it meets the set requirements; During construction, the channel support structure is hoisted to the bottom of the flange plate (10) and fixedly connected to the embedded structure; after all the channel support structures are installed, the channel deck structure is sequentially placed between the channel support structures along the longitudinal direction; finally, the stairs are constructed to connect the stairs to the pedestrian channel structure.

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