Box girder structure suitable for highway heavy traffic conditions

Abstract

The utility model relates to a box girder structure suitable for road heavy-load traffic conditions, and solves the problem that a conventional standard box girder cannot meet the requirement of heavy equipment transportation on the load capacity of a road bridge in the construction process of a large-scale project. The device comprises a box girder body, the box girder body comprises a top plate, a bottom plate and side plates on the two sides, two web plates are arranged between the top plate and the bottom plate, the web plates are evenly arranged between the side plates on the two sides, the interior of the box girder body is evenly divided into three chambers, and the distance between the center lines of the two web plates is matched with the wheel track of a heavy-load vehicle to pass through. The box girder structure can be used as a normal highway bridge traffic network at ordinary times, when heavy-duty vehicles need to pass in large-scale project construction, the heavy-duty vehicles strictly and slowly pass along heavy-duty lanes under the command of commanders, it is ensured that 90% of axle load directly acts on the upper portion of a web, and the effect of the heavy-duty vehicles is achieved. Factors such as non-uniform axle load distribution and deviation of a heavy-load transport vehicle are solved, so that the local compressive bearing capacity of the top plate is greatly improved.

Description

Technical Field

[0001] This utility model belongs to the field of municipal engineering and relates to a bridge structure, particularly a box girder structure suitable for heavy-load traffic conditions on highways. Background Technology

[0002] With the continuous improvement of my country's engineering construction level, some large-scale engineering equipment is heavy and has high transportation requirements, which also puts forward higher requirements for the load-bearing capacity of highway bridges. For example, with the launch of the Envision Cangnan Zero-Carbon Base project and the continuous increase in wind power installed capacity in Cangnan County, according to the requirements of wind turbines and transportation equipment, the transport vehicles use 15-axle flatbed trucks with a flatbed width of 3 meters, a total length of 32 meters, a total width of 10.5 meters, and a total height of 12 meters. The total weight of the convoy is about 560 tons, so the bridge and road load-bearing capacity must meet 560 tons. However, existing highway bridges generally use traditional box girder structures. The design of standard box girder concrete structures requires comprehensive consideration of factors such as structural stress, span, load, material properties, and construction conditions. The girder height is approximately 1 / 15 to 1 / 25 of the span, the top slab thickness is generally 200mm to 500mm, and the bottom slab thickness is generally 150mm to 400mm. However, the web layout is not ideal when facing heavy vehicles transporting wind turbine equipment. The traditional fixed web spacing cannot match the special wheelbase of the transport vehicles, resulting in load transfer path deviation and excessive maximum shear stress in the web area. Furthermore, the thickness of the top slab and its connection with the web are insufficient to withstand the concentrated load of a single axle of a heavy transport vehicle, resulting in poor load dispersion and a high risk of structural cracking. Therefore, the existing standard box girder design is unable to meet the special requirements of transporting wind turbine equipment and other heavy equipment, and can no longer satisfy the heavy equipment transportation needs of such projects. Utility Model Content

[0003] The purpose of this utility model is to solve the problem that conventional standard box girders cannot meet the load capacity requirements of road bridges during the transportation of heavy equipment in the construction of large-scale projects. It provides a box girder structure suitable for heavy-load traffic conditions on highways. The thickness of the top plate and the spacing of the web plates of the box girder are designed to be adapted to heavy vehicles. It is used as a regular highway bridge for normal traffic and as a passage for heavy vehicles during heavy-load transportation, thus meeting the passage needs of heavy-load vehicles.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a box girder structure suitable for heavy-load traffic conditions on highways, including a box girder body, the box girder body including a top plate, a bottom plate and side plates on both sides, two web plates are provided between the top plate and the bottom plate, the web plates are evenly arranged between the side plates on both sides, dividing the interior of the box girder body into three chambers, and the distance between the center lines of the two web plates is adapted to the wheel track of the heavy-load vehicle to be passed.

[0005] For each chamber, the thickness of the top slab corresponding to the middle section of each chamber is 30-40cm, the width of the middle section is 0.2-0.3 times the width of each chamber, the thickness at the junction of the top slab and the web is not less than 60cm and not less than 1 / 3 of the thickness of the box girder body, the thickness of the bottom slab corresponding to the middle section of each chamber is 30-40cm, and the thickness at the junction of the bottom slab and the web is not less than 60cm and not less than 1 / 3 of the thickness of the box girder body.

[0006] The web spacing of this structure is designed to be adapted to the wheelbase of heavy-duty vehicles. Trajectory lines for heavy-duty vehicles are marked on the box girder bridge deck, forming a directional trajectory that matches the vehicle's wheelbase width. This ensures that 90% of the axle load acts directly on the top of the web, resolving issues such as uneven axle load distribution and offset in heavy-duty transport vehicles, and significantly improving the local compressive bearing capacity of the top slab. The joints between the top slab, bottom slab, and web are thickened, with the thickness of the top and bottom slabs optimized to a gradual increase from the middle of each chamber towards both sides. This improves the flexural stiffness of the cross-section and avoids cracking caused by localized stress concentration. This box girder structure can be used as a normal highway bridge in normal times. During large-scale project construction, when heavy-duty vehicles need to pass, these vehicles must proceed slowly and strictly along the heavy-duty lane under the direction of traffic controllers.

[0007] Preferably, the connection between the middle section of the top plate and the web of the top plate is made by a uniform slope transition.

[0008] Preferably, the structure at the junction of the top plate and the side plate is the same as the structure at the junction of the top plate and the web plate.

[0009] Preferably, the width of each compartment of the box girder body is 150-180cm.

[0010] Preferably, the thickness of the web is 50–75 cm.

[0011] Preferably, both the side plates and the web plates are vertically arranged and have the same thickness.

[0012] Preferably, cantilever sections are provided on both sides of the top plate towards the outer side plate, and anti-collision guardrails are provided on the cantilever sections.

[0013] Preferably, a road surface layer is provided above the top plate, and two motor vehicle lanes are marked on the left and right sides of the road surface layer; a heavy-duty lane is marked in the center of the top plate, and the lane lines of the heavy-duty lane are marked on the outer side of the corresponding position of the web plate.

[0014] Preferably, the width of the heavy-duty lane is 310-330cm.

[0015] Preferably, the width of the driving lane is 350-375cm.

[0016] As a preferred option, a steel fiber reinforced concrete pavement layer is poured onto the upper surface of the top slab.

[0017] This utility model box girder structure can be used as a normal highway bridge traffic network under normal circumstances. When heavy-load vehicles need to pass during the construction of large-scale projects, the heavy-load vehicles must strictly follow the heavy-load lane under the command of the personnel to ensure that 90% of the axle load is directly applied to the top of the web plate. This solves the problems of uneven axle load distribution and offset of heavy-load transport vehicles, and greatly improves the local compressive bearing capacity of the top plate. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of a bridge cross-section structure according to the present invention.

[0020] Figure 2 This is a schematic diagram of a bridge deck structure according to the present invention.

[0021] Figure 3 This is a schematic diagram of a box girder body structure according to this utility model.

[0022] In the diagram: 1. Top slab, 2. Bottom slab, 3. Side slab, 4. Web slab, 5. Chamber, 6. Cantilever, 7. Crash barrier, 8. Road surface layer. Detailed Implementation

[0023] The present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0024] Example: A box girder structure suitable for heavy-load highway traffic conditions, such as... Figure 1 , 3 As shown. This structure includes a box girder body, which comprises a top plate 1, a bottom plate 2, and side plates 3 on both sides. Two web plates 4 are provided between the top plate and the bottom plate. The web plates 4 are evenly distributed between the side plates 3 on both sides, dividing the interior of the box girder body into three chambers 5. The distance between the centerlines of the two web plates 4 is adapted to the wheel track of the heavy-duty vehicles to be passed. Cantilever sections 6 are provided on both sides of the top plate 1 extending outwards from the side plates, and crash barriers 7 are installed on the cantilever sections.

[0025] like Figure 3 As shown, in this example, the box girder body has a thickness of 170cm, and the total width for each compartment is 160cm. The thickness of the middle section of the top slab corresponding to the middle of each compartment is 35cm, and the width of the middle section is 40cm. The thickness at the junction of the top slab with the web and side plates is 60cm. The thickness of the bottom slab corresponding to the middle of each compartment is 35cm, and the thickness at the junction of the bottom slab with the web and side plates is 60cm. The width of the web and side plates is 65cm. The junction between the middle section of the top slab and the web of the top slab uses a uniform sloping transition. The structure at the junction of the top slab and the side plates is consistent with the structure at the junction of the top slab and the web.

[0026] like Figure 1 , 2 As shown, a road surface layer 8, made of steel fiber reinforced concrete, is installed above the top slab 1. Two lanes for motor vehicles are marked on the left and right sides of the road surface layer 8, each 375cm wide. A heavy-duty lane, 330cm wide, is marked in the center of the top slab. The lane lines for the heavy-duty lane are marked on the outer side of the corresponding position on the web.

[0027] This example demonstrates its use in the transportation route of the Envision Cangnan Zero-Carbon Base project in Cangnan County. Normally, it serves as a regular highway bridge network. During large-scale project construction, when heavy-duty vehicles are required to pass, these vehicles must strictly adhere to the heavy-duty lane under the direction of personnel. The specifications for the wind turbines and transportation equipment provided by Envision Energy Co., Ltd. require that the transport vehicles use 15-axle flatbed trucks with a flatbed width of 3 meters, a total length of 32 meters, a total width of 10.5 meters, a total height of 12 meters, and a total fleet weight of approximately 560 tons. The bridge and road load-bearing capacity must also meet this requirement.

Claims

1. A box girder structure suitable for heavy-load traffic conditions on highways, comprising a box girder body, the box girder body including a top plate, a bottom plate, and side plates on both sides, characterized in that: Two web plates are provided between the top plate and the bottom plate. The web plates are evenly distributed between the side plates on both sides, dividing the interior of the box girder body into three chambers. The distance between the center lines of the two web plates is adapted to the wheel track of the heavy-duty vehicle to be passed. For each chamber, the thickness of the top slab corresponding to the middle section of each chamber is 30-40cm, the width of the middle section is 0.2-0.3 times the width of each chamber, the thickness at the junction of the top slab and the web is not less than 60cm and not less than 1 / 3 of the thickness of the box girder body, the thickness of the bottom slab corresponding to the middle section of each chamber is 30-40cm, and the thickness at the junction of the bottom slab and the web is not less than 60cm and not less than 1 / 3 of the thickness of the box girder body.

2. A box girder structure suitable for heavy-load highway traffic conditions according to claim 1, characterized in that: The junction between the middle section of the top plate and the web of the top plate adopts a uniform slope transition.

3. A box girder structure suitable for heavy-load highway traffic conditions according to claim 1 or 2, characterized in that: The structure at the junction of the top plate and the side plate is the same as the structure at the junction of the top plate and the web plate.

4. A box girder structure suitable for heavy-load highway traffic conditions according to claim 1, characterized in that: The width of each compartment of the box girder body is 150-180cm.

5. A box girder structure suitable for heavy-load highway traffic conditions according to claim 4, characterized in that: The thickness of the web is 50–75 cm.

6. A box girder structure suitable for heavy-load highway traffic conditions according to claim 1 or 5, characterized in that: Both the side plates and the web are vertically arranged and have the same thickness.

7. A box girder structure suitable for heavy-load highway traffic conditions according to claim 1, characterized in that: The top plate has cantilever sections on both sides extending outwards from the side plates, and anti-collision guardrails are installed on the cantilever sections.

8. A box girder structure suitable for heavy-load highway traffic conditions according to claim 1, characterized in that: A road surface layer is provided above the top slab, and two motor vehicle lanes are marked on the left and right sides of the road surface layer; a heavy-duty lane is marked in the center of the top slab, and the lane lines of the heavy-duty lane are marked on the outer side of the corresponding position of the web.

9. A box girder structure suitable for heavy-load highway traffic conditions according to claim 8, characterized in that: The width of the heavy-duty lane is 310-330cm.

10. A box girder structure suitable for heavy-load highway traffic conditions according to claim 8, characterized in that: The width of the motor vehicle lane is 350-375cm.

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