Existing bridge expansion structure

Abstract

The utility model relates to the technical field of bridge expansion reconstruction, in particular to an existing bridge expansion structure which comprises a sidewalk, the sidewalk is of a steel structure, the steel structure is arranged on the surface of a bridge, the outer side of the steel structure protrudes out of the bridge, and a reinforced concrete structure is arranged on the inner side of the steel structure. The inner side of the steel structure is embedded into the reinforced concrete structure, and the steel structure and the reinforced concrete structure are both connected with a bridge in an anchoring mode. According to the scheme, the overhanging steel structure is arranged on the bridge floor to serve as a sidewalk, the purpose of widening the bridge floor is achieved, overall bridge reconstruction is not needed, the construction amount is small, and time and labor are saved; during construction, the prefabricated steel member can be directly constructed on the bridge floor, the operation risk is small, and the construction efficiency is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to bridge expansion reconstruction technical field, especially a bridge expansion structure. BACKGROUND

[0002] In the early traffic composition form, such as Figure 1 、 Figure 2 Because the proportion of non-motor vehicles and pedestrians is very high, many bridges are provided with a wide special non-motor vehicle lane and sidewalk 1, with the improvement of people's living standards, the proportion of motor vehicle travel is greatly improved, and the proportion of walking travel is greatly reduced, accordingly, it is necessary to re-plan the bridge function, increase the number of motor vehicle lanes, and adopt a mixed lane to meet the needs of pedestrian and non-motor vehicle traffic. The original bridge design width cannot meet the traffic demand, and the bridge road needs to be widened and expanded.

[0003] The current bridge expansion reconstruction mainly adopts the form of widening, that is, a new bridge is built beside the original bridge to increase the bridge traffic area, or the whole bridge is demolished and reconstructed to build a wider bridge. The construction period and cost of widening bridge or building new bridge are increased, sometimes there are problems of land use, flood discharge, navigation, environmental protection and special approval, and the demolition and reconstruction have the characteristics of large resource consumption, which is not conducive to sustainable development.

[0004] The bridge expansion method in the prior art is time-consuming and costly, which leads to the bridge becoming a traffic bottleneck, how to realize the widening reconstruction of the existing bridge, improve the reconstruction efficiency, reduce the reconstruction cost and ensure the structural safety has become the focus of structural engineers. UTILITY MODEL CONTENT

[0005] The utility model aims at: in view of the problems that the existing bridge needs to be widened to increase the number of motor vehicle lanes, and the existing bridge expansion method is time-consuming and costly, which easily leads to the bridge becoming a traffic bottleneck, a bridge expansion structure is provided.

[0006] In order to realize the above purpose, the utility model adopts the technical scheme that:

[0007] A bridge expansion structure, comprising a sidewalk, the sidewalk adopts a steel structure, the steel structure is arranged on the surface of the bridge and the side of the steel structure away from the lane is cantilevered on the bridge to be suspended, a reinforced concrete structure is arranged on the side of the steel structure close to the lane, the side of the steel structure close to the lane is embedded in the reinforced concrete structure, and the steel structure and the reinforced concrete structure are anchored and connected with the bridge.

[0008] The utility model discloses a steel structure sidewalk is arranged in the sidewalk area of bridge, and the steel structure sidewalk is overlapped on the bridge surface, and the side of the steel structure sidewalk far from the lane is suspended, and the width of bridge is widened, and the reinforced concrete structure is arranged on the side of the steel structure sidewalk close to the lane, and the side of the steel structure sidewalk close to the lane is embedded and connected with the reinforced concrete structure, and is anchored and connected between the steel structure sidewalk and the bridge and between the reinforced concrete structure and the bridge respectively, the anti-overturning stability of the steel structure is guaranteed, thereby realizing the expansion of bridge.

[0009] Based on the existing bridge, in the case that the original sidewalk area is moved outward to meet the demand of increasing the number of motor vehicle lanes of the existing bridge, the steel structure form of large cantilever is adopted to expand, which can meet the existing width demand of the sidewalk for mixed traffic of pedestrians and non-motor vehicles, without the need of realizing expansion through overall reconstruction of the bridge, with small construction amount, time and labor saving, and high construction efficiency.

[0010] In addition, the concrete sidewalk structure of the original bridge is replaced by the light steel structure in the utility model, and the material properties of light weight and high strength of steel are fully utilized, and compared with the concrete sidewalk structure, the dead load of the bridge is reduced under the conditions of meeting the structural stress demand and increasing the passing width of the bridge, which is beneficial to reserving more bearing capacity for mobile load traffic and has small influence on the stress of the bridge structure.

[0011] As a preferred scheme of the utility model, the steel structure is a combined steel member, which is composed of a plurality of prefabricated steel members spliced along the longitudinal direction. The sidewalk in the utility model is spliced by a plurality of prefabricated steel members along the longitudinal direction, which includes a top surface and a side surface, and the top surface and the side surface enclose a certain space and have a certain height. The side surface can be a straight side surface, an inclined side surface, a combination of a straight side surface and an inclined side surface, or a combination of a plurality of inclined side surfaces, etc. During construction, the prefabricated steel members are hoisted to the beam surface in sections, and then spliced and fixed, which is convenient for construction and reliable in structure quality.

[0012] As a preferred scheme of the utility model, the side of the steel structure close to the lane is provided with a supporting stiffener, the supporting stiffener is provided with an opening, and the supporting stiffener is integrally connected with the reinforced concrete structure. The opening in the supporting stiffener on the inner side of the steel structure makes the supporting stiffener serve as a PBL shear key. During construction, the reinforcing steel bars can be inserted into the opening, and the concrete is filled in the side of the steel structure close to the lane, so as to form the reinforced concrete structure. The supporting stiffener can be arranged horizontally, vertically or obliquely, and the number and arrangement mode thereof can be reasonably selected according to the stress demand.

[0013] As a further preferred scheme of the utility model, the supporting stiffening rib is vertically arranged, and the supporting stiffening rib is arranged along the longitudinal direction at intervals. The supporting stiffening rib adopting the structural form has high shear strength of the reinforced concrete structure, is also beneficial to the steel bar arranged from the opening, and improves the overturning stability of the steel structure sidewalk.

[0014] As a preferred scheme of the utility model, a pipeline installation cavity is arranged along the longitudinal direction in the steel structure, and the pipeline along the river is arranged through the pipeline installation cavity.

[0015] As a preferred scheme of the utility model, the steel structure comprises a plurality of longitudinal beams supported on the bridge, the longitudinal beams are arranged along the longitudinal direction of the sidewalk, and the plurality of longitudinal beams are arranged along the transverse direction of the sidewalk at intervals; the top of the longitudinal beam is provided with a top plate, and the top plate is connected with all the longitudinal beams; the bottom of the longitudinal beam is provided with a supporting bottom plate, and the supporting bottom plate is used for being connected with the bridge; a transverse stiffening rib is arranged between the adjacent longitudinal beams, and the transverse stiffening rib is connected with the longitudinal beam, the top plate and the supporting bottom plate respectively; the steel structure further comprises a cantilever beam, and the cantilever beam is arranged in suspension on the side of the steel structure away from the lane, and the cantilever beam is connected with the top plate and the longitudinal beam respectively.

[0016] In the scheme, the longitudinal beam is the main stress structure of the steel structure sidewalk, the top plate transmits the upper load to the longitudinal beam at the bottom, the longitudinal beam transmits the load to the supporting bottom plate, and the supporting bottom plate transmits the load to the bridge structure member below; the transverse stiffening rib is a reinforcing structure, is used for transmitting the upper load to the supporting bottom plate, and guarantees the connection stability between the longitudinal beam, the top plate and the bottom plate, and guarantees the structural strength. The supporting bottom plate can be an integral steel plate connected with all the longitudinal beams, or the supporting bottom plate is arranged at the bottom of each longitudinal beam at intervals along the transverse direction.

[0017] As a further preferred scheme of the utility model, the cantilever beam is further connected with the supporting bottom plate at the bottom of the outermost longitudinal beam, is more suitable for the case that the cantilever beam is long in cantilever, and has good stress performance.

[0018] As a preferred scheme of the utility model, the top surface of the steel structure is smoothly connected with the top surface of the reinforced concrete structure, and the top surface of the steel structure is inclined to the side of the bridge center line and has an inclination of 1%-2%, so that the water can be drained, and the rainwater can be reduced to accumulate at the sidewalk.

[0019] As a preferred scheme of the utility model, the reinforced concrete structure is provided with an inner guardrail, and the side of the sidewalk away from the lane is provided with an outer guardrail. The inner guardrail and the outer guardrail are arranged for the protection of the sidewalk, and guarantee the safety of the pedestrians and non-motor vehicles.

[0020] In conclusion, due to the adoption of the above technical scheme, the utility model has the beneficial effects that:

[0021] 1. The existing bridge expansion structure provided by the utility model widens the bridge deck by setting overhanging steel structure as sidewalk on the bridge deck, achieves the purpose of widening the bridge deck, does not need to rebuild the bridge as a whole, has small construction amount, saves time and effort; the prefabricated steel member can be directly constructed on the bridge deck during construction, has small operation risk and high construction efficiency.

[0022] 2. The existing bridge expansion structure provided by the utility model replaces the concrete sidewalk structure of the original bridge with light steel structure, reduces the dead load of the bridge, and is beneficial to reserving more bearing capacity for mobile load traffic.

[0023] 3. The existing bridge expansion structure provided by the utility model adopts the steel structure form of large cantilever as sidewalk, fully utilizes the material characteristics of light weight and high strength of steel, meets the structural stress requirement, and also can reduce the stress influence on the bridge structural member, thereby improving the safety degree of the bridge structure. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is the design section view of the bridge in the prior art under the condition of no non-motor vehicle lane type;

[0025] Figure 2 is the design section view of the bridge in the prior art under the condition of non-motor vehicle lane type;

[0026] Figure 3 is the structural schematic view of the existing bridge expansion structure in embodiment 1;

[0027] Figure 4 is the construction state schematic view when the expansion structure is connected with the existing bridge;

[0028] Figure 5 is the overall effect view after the existing bridge in Figure 1 is reconstructed by the expansion structure of embodiment 1;

[0029] Figure 6 is the overall effect view after the existing bridge in Figure 2 is reconstructed by the expansion structure of embodiment 1.

[0030] Figure legend: 1 - sidewalk; 2 - longitudinal beam; 3 - top plate; 4 - supporting bottom plate; 5 - transverse stiffening rib; 51 - pipeline installation cavity; 6 - cantilever beam; 7 - supporting stiffening rib; 8 - inner guardrail; 9 - outer guardrail; 10 - reinforced concrete structure; 11 - bridge deck slab. DETAILED DESCRIPTION

[0031] The utility model will be described in detail in combination with the drawings.

[0032] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the utility model is further described in detail below in combination with the drawings and examples.

[0033] Example 1

[0034] A kind of existing bridge expansion structure, as shown in Figures 3-6 The sidewalk 1 is adopted steel structure, steel structure is arranged on the bridge surface and the outer side of steel structure is overhanging on the bridge, and the inner side of steel structure is provided with reinforced concrete structure 10, such as reinforced concrete curb, reinforced concrete ground, the inner side of steel structure is embedded in reinforced concrete structure 10 and is arranged, and steel structure and reinforced concrete structure 10 are all anchored and connected with the bridge.When the above structure is directly applied to the bridge on which the concrete bridge deck or steel composite bridge deck has been paved, as shown in Figure 4 The above steel structure can be connected with the bridge deck 11 of the bridge by chemical anchor bolt, such as M20x260 chemical anchor bolt, and the implantation depth is greater than or equal to 200mm, and the reinforced concrete structure 10 is connected with the bridge as a whole by drilling and planting steel bars.

[0035] The scheme removes the concrete sidewalk 1 of the original bridge, and sets the steel structure sidewalk 1 in the area closer to the outer side, leaving more structural width for the lane. The scheme connects the steel structure sidewalk 1 on the surface of the bridge, suspends the outer side of the steel structure sidewalk 1, widens the width of the bridge, sets the reinforced concrete structure 10 on the inner side of the steel structure sidewalk 1, embeds and connects the inner side of the steel structure sidewalk 1 and the reinforced concrete structure 10, and respectively sets the anchor connection between the steel structure sidewalk 1 and the bridge and between the reinforced concrete structure 10 and the bridge, to ensure the anti-overturning stability of the overhanging steel structure, so as to realize the expansion of the bridge. The above reinforced concrete structure 10 not only can be used as the weight of the steel structure of the sidewalk 1, but also can play the role of the anti-collision guardrail on the outer side of the bridge.

[0036] Specifically, the steel structure in the embodiment is a combined steel member, which is spliced by several prefabricated steel members in the longitudinal direction; each steel member is welded by several steel plates, and the outer shape of the body of the steel member is like a lid, has a certain height, and the top surface and the side surface enclose a certain space. During construction, the prefabricated segment steel members are hoisted to the beam surface, and then splicing and fixing are performed, which is convenient and efficient, and the structure quality of the prefabricated member is reliable. In the embodiment, the steel structure includes several longitudinal beams 2 supported on the bridge, the longitudinal beams 2 are plate-shaped, and the longitudinal beams 2 are arranged in the longitudinal direction of the sidewalk 1; the several longitudinal beams 2 are arranged at intervals in the transverse direction of the sidewalk 1; the top of the longitudinal beam 2 is provided with a top plate 3, and the top plate 3 connects all the longitudinal beams 2; the bottom of each longitudinal beam 2 is provided with a supporting bottom plate 4, and the supporting bottom plate 4 is used to be connected with the bridge through high-strength bolts or chemical anchors; a transverse stiffening rib 5 is arranged between adjacent longitudinal beams 2, and the transverse stiffening rib 5 connects the longitudinal beam 2, the top plate 3 and the supporting bottom plate 4 respectively; a pipeline installation cavity 51 is arranged on the transverse stiffening rib 5, and the pipeline installation cavity 51 is used for passing through the pipeline along the river; the pipeline installation cavity 51 is in the shape of a groove, and the opening is downward; the steel structure further includes a cantilever beam 6 arranged on the outer side, the cross section of the cantilever beam 6 is in the shape of a trapezoid, and the cantilever beam 6 is integrally connected with the top plate 3 and the outermost longitudinal beam 2. In the scheme, the longitudinal beam 2 serves as the main force structure of the steel structure sidewalk 1, the top plate 3 transmits the upper load to the bottom longitudinal beam 2, the longitudinal beam 2 transmits the load to the supporting bottom plate 4, and then the load is transmitted to the lower bridge structure member; the transverse stiffening rib 5 is a reinforcing structure, which is used for transmitting the upper load to the supporting bottom plate 4, and ensuring the connection stability between the longitudinal beam 2, the top plate 3 and the bottom plate, and ensuring the structural strength.

[0037] Further, in order to lengthen the cantilever length of the steel structure sidewalk 1, the cantilever beam 6 is preferably connected with the supporting bottom plate at the bottom of the outermost longitudinal beam 2, and the stress resistance is better. Figure 4 .

[0038] Further, the inner side of the steel structure is provided with a supporting stiffening rib 7, the supporting stiffening rib 7 is vertically arranged, the supporting stiffening rib 7 is arranged at intervals in the longitudinal direction, the supporting stiffening rib 7 is vertically connected with the web plate of the longitudinal beam 2 and the top plate 3, the supporting stiffening rib 7 is provided with an opening, a steel bar is inserted into the opening, the supporting stiffening rib 7 serves as a PBL shear key, the supporting stiffening rib 7 is integrally connected with the reinforced concrete structure 10, and the stability of the steel structure against overturning is ensured.

[0039] In the embodiment, the width of the steel structure sidewalk 1 is about 3900mm, i.e. the distance between the inner side of the reinforced concrete structure 10 and the outer side of the steel structure cantilever beam 6 is about 3900mm, the width of the cantilever beam 6 (i.e. the length of the steel structure cantilever) is about 1600mm, the width of the cantilever beam 6 is close to 2:3 compared with the width of the steel structure on the bridge, the top surface of the steel structure is 45cm away from the top surface of the driving lane, the top surface of the steel structure is smoothly connected with the top surface of the reinforced concrete structure 10, the top surface of the steel structure is inclined towards the inner side with an inclination of 1%-2% to facilitate drainage and reduce rainwater accumulation at the sidewalk 1. The reinforced concrete structure 10 is provided with an inner guardrail 8, and the outer side of the sidewalk 1 is provided with an outer guardrail 9, and the inner guardrail 8 and the outer guardrail 9 are arranged for the protection of the sidewalk 1 to ensure the safety of the pedestrians and non-motor vehicles.

[0040] As shown in Figure 5 , based on the existing bridge in Figure 1 , after the original wider sidewalk 1 is removed, the area occupied by the original sidewalk is moved outward by a certain distance, and the steel structure form of the large cantilever is used for expansion, and after the sidewalks on both sides are moved outward by a certain distance under the condition of the width of the existing bridge, the width left in the middle can be used for the newly added lanes, and at the same time, the large cantilever steel structure sidewalk 1 can meet the existing width requirement for mixed traffic of pedestrians and non-motor vehicles; as shown in Figure 6 , based on the existing bridge in Figure 2 , after the original narrower concrete sidewalk 1 for pedestrians is removed, the steel structure form of the large cantilever is used for expansion to realize mixed traffic of pedestrians and non-motor vehicles, and the traffic routes are re-planned between the newly expanded sidewalks on both sides to form four lanes to meet the traffic demand of the existing bridge with higher traffic flow. The expansion and reconstruction of the existing bridge using the present scheme has small construction amount, saves time and labor, and has high construction efficiency, and does not need to realize expansion by overall reconstruction of the bridge; moreover, the present scheme can directly use the existing bridge deck as the construction foundation, which is convenient for construction and has small construction risk. The present technology is consistent with the proportion of motor vehicles, non-motor vehicles and pedestrians in the current traffic flow in China, can fully develop the traffic potential of the bridge, and meets the traffic demand of all parties.

[0041] In addition, the present technology replaces the concrete sidewalk 1 structure of the original bridge with a light steel structure, which can reduce the dead load of the bridge under the condition of increasing the traffic width of the bridge, and reserve more bearing capacity for moving load traffic.

[0042] After the present technology is used, the stress influence on the structural members of the bridge can be reduced, and even the internal force borne by the original members can be reduced, the safety of the structure is improved, the bridge structure is avoided from reinforcement treatment, the engineering cost is reduced, and the construction period is shortened.

[0043] It should be noted that, in this "outside" "inside" is relative to the bridge center line, close to the side of the lane is the inside, away from the side of the lane is the outside.

[0044] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An existing bridge expansion structure, comprising a sidewalk (1), characterized in that: The sidewalk (1) is a steel structure, which is arranged on the bridge surface and the side of the steel structure away from the lane is cantilevered from the bridge to be suspended. A reinforced concrete structure (10) is provided on the side of the steel structure close to the lane, and the side of the steel structure close to the lane is embedded in the reinforced concrete structure (10). Both the steel structure and the reinforced concrete structure (10) are anchored to the bridge.

2. The existing bridge expansion structure according to claim 1, characterized in that: The steel structure is a composite steel member, which is formed by splicing a plurality of prefabricated steel members in the longitudinal direction.

3. The existing bridge expansion structure according to claim 2, characterized in that: A supporting stiffening rib (7) is provided on a side of the steel structure close to the lane, the supporting stiffening rib (7) is provided with an opening, and the supporting stiffening rib (7) is integrally connected to the reinforced concrete structure (10).

4. The existing bridge expansion structure according to claim 3, characterized in that: The supporting stiffening ribs (7) are arranged vertically.

5. The existing bridge expansion structure according to claim 1, characterized in that: A pipeline installation cavity (51) is provided in the steel structure along the longitudinal direction.

6. The existing bridge expansion structure according to any one of claims 1 to 5, characterized in that: The steel structure comprises a plurality of longitudinal beams (2) supported on the bridge, wherein the longitudinal beams (2) are arranged along the longitudinal direction of the sidewalk (1), and the plurality of longitudinal beams (2) are arranged at intervals along the transverse direction of the sidewalk (1); a top plate (3) is provided on the top of the longitudinal beams (2), and the top plate (3) connects all the longitudinal beams (2); a supporting bottom plate (4) is provided on the bottom of the longitudinal beams (2), and the supporting bottom plate (4) is used to connect with the bridge; transverse stiffening ribs (5) are provided between adjacent longitudinal beams (2), and the transverse stiffening ribs (5) are respectively connected to the longitudinal beams (2), the top plate (3) and the supporting bottom plate (4); the steel structure further comprises a cantilever beam (6), which is suspended on a side of the steel structure away from the lane, and the cantilever beam (6) is respectively connected to the top plate (3) and the longitudinal beams (2).

7. The existing bridge expansion structure according to claim 6, characterized in that: The cantilever beam (6) is also connected to the supporting base plate (4).

8. The existing bridge expansion structure according to any one of claims 1 to 5, characterized in that: The top surface of the steel structure and the top surface of the reinforced concrete structure (10) are smoothly connected, and the top surface of the steel structure is inclined toward the side where the center line of the bridge is located with an inclination gradient of 1%-2%.

9. The existing bridge expansion structure according to any one of claims 1 to 5, characterized in that: An inner guardrail (8) is provided on the reinforced concrete structure (10), and an outer guardrail (9) is provided on the side of the sidewalk (1) away from the lane.

10. The existing bridge expansion structure according to any one of claims 1 to 5, characterized in that: The steel structure is connected to the concrete bridge deck / steel-concrete composite bridge deck through chemical anchor bolts.

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